drivers/power/ab8500_charger.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2012
   3  *
   4  * Charger driver for AB8500
   5  *
   6  * License Terms: GNU General Public License v2
   7  * Author:
   8  *      Johan Palsson <johan.palsson@stericsson.com>
   9  *      Karl Komierowski <karl.komierowski@stericsson.com>
  10  *      Arun R Murthy <arun.murthy@stericsson.com>
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/device.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/delay.h>
  18 #include <linux/slab.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/power_supply.h>
  21 #include <linux/completion.h>
  22 #include <linux/regulator/consumer.h>
  23 #include <linux/err.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/kobject.h>
  26 #include <linux/of.h>
  27 #include <linux/mfd/core.h>
  28 #include <linux/mfd/abx500/ab8500.h>
  29 #include <linux/mfd/abx500.h>
  30 #include <linux/mfd/abx500/ab8500-bm.h>
  31 #include <linux/mfd/abx500/ab8500-gpadc.h>
  32 #include <linux/mfd/abx500/ux500_chargalg.h>
  33 #include <linux/usb/otg.h>
  34 #include <linux/mutex.h>
  35
  36 /* Charger constants */
  37 #define NO_PW_CONN                      0
  38 #define AC_PW_CONN                      1
  39 #define USB_PW_CONN                     2
  40
  41 #define MAIN_WDOG_ENA                   0x01
  42 #define MAIN_WDOG_KICK                  0x02
  43 #define MAIN_WDOG_DIS                   0x00
  44 #define CHARG_WD_KICK                   0x01
  45 #define MAIN_CH_ENA                     0x01
  46 #define MAIN_CH_NO_OVERSHOOT_ENA_N      0x02
  47 #define USB_CH_ENA                      0x01
  48 #define USB_CHG_NO_OVERSHOOT_ENA_N      0x02
  49 #define MAIN_CH_DET                     0x01
  50 #define MAIN_CH_CV_ON                   0x04
  51 #define USB_CH_CV_ON                    0x08
  52 #define VBUS_DET_DBNC100                0x02
  53 #define VBUS_DET_DBNC1                  0x01
  54 #define OTP_ENABLE_WD                   0x01
  55
  56 #define MAIN_CH_INPUT_CURR_SHIFT        4
  57 #define VBUS_IN_CURR_LIM_SHIFT          4
  58 #define AUTO_VBUS_IN_CURR_LIM_SHIFT     4
  59
  60 #define LED_INDICATOR_PWM_ENA           0x01
  61 #define LED_INDICATOR_PWM_DIS           0x00
  62 #define LED_IND_CUR_5MA                 0x04
  63 #define LED_INDICATOR_PWM_DUTY_252_256  0xBF
  64
  65 /* HW failure constants */
  66 #define MAIN_CH_TH_PROT                 0x02
  67 #define VBUS_CH_NOK                     0x08
  68 #define USB_CH_TH_PROT                  0x02
  69 #define VBUS_OVV_TH                     0x01
  70 #define MAIN_CH_NOK                     0x01
  71 #define VBUS_DET                        0x80
  72
  73 #define MAIN_CH_STATUS2_MAINCHGDROP             0x80
  74 #define MAIN_CH_STATUS2_MAINCHARGERDETDBNC      0x40
  75 #define USB_CH_VBUSDROP                         0x40
  76 #define USB_CH_VBUSDETDBNC                      0x01
  77
  78 /* UsbLineStatus register bit masks */
  79 #define AB8500_USB_LINK_STATUS          0x78
  80 #define AB8500_STD_HOST_SUSP            0x18
  81
  82 /* Watchdog timeout constant */
  83 #define WD_TIMER                        0x30 /* 4min */
  84 #define WD_KICK_INTERVAL                (60 * HZ)
  85
  86 /* Lowest charger voltage is 3.39V -> 0x4E */
  87 #define LOW_VOLT_REG                    0x4E
  88
  89 /* Step up/down delay in us */
  90 #define STEP_UDELAY                     1000
  91
  92 #define CHARGER_STATUS_POLL 10 /* in ms */
  93
  94 #define CHG_WD_INTERVAL                 (60 * HZ)
  95
  96 #define AB8500_SW_CONTROL_FALLBACK      0x03
  97 /* Wait for enumeration before charing in us */
  98 #define WAIT_ACA_RID_ENUMERATION        (5 * 1000)
  99
 100 /* UsbLineStatus register - usb types */
 101 enum ab8500_charger_link_status {
 102         USB_STAT_NOT_CONFIGURED,
 103         USB_STAT_STD_HOST_NC,
 104         USB_STAT_STD_HOST_C_NS,
 105         USB_STAT_STD_HOST_C_S,
 106         USB_STAT_HOST_CHG_NM,
 107         USB_STAT_HOST_CHG_HS,
 108         USB_STAT_HOST_CHG_HS_CHIRP,
 109         USB_STAT_DEDICATED_CHG,
 110         USB_STAT_ACA_RID_A,
 111         USB_STAT_ACA_RID_B,
 112         USB_STAT_ACA_RID_C_NM,
 113         USB_STAT_ACA_RID_C_HS,
 114         USB_STAT_ACA_RID_C_HS_CHIRP,
 115         USB_STAT_HM_IDGND,
 116         USB_STAT_RESERVED,
 117         USB_STAT_NOT_VALID_LINK,
 118         USB_STAT_PHY_EN,
 119         USB_STAT_SUP_NO_IDGND_VBUS,
 120         USB_STAT_SUP_IDGND_VBUS,
 121         USB_STAT_CHARGER_LINE_1,
 122         USB_STAT_CARKIT_1,
 123         USB_STAT_CARKIT_2,
 124         USB_STAT_ACA_DOCK_CHARGER,
 125 };
 126
 127 enum ab8500_usb_state {
 128         AB8500_BM_USB_STATE_RESET_HS,   /* HighSpeed Reset */
 129         AB8500_BM_USB_STATE_RESET_FS,   /* FullSpeed/LowSpeed Reset */
 130         AB8500_BM_USB_STATE_CONFIGURED,
 131         AB8500_BM_USB_STATE_SUSPEND,
 132         AB8500_BM_USB_STATE_RESUME,
 133         AB8500_BM_USB_STATE_MAX,
 134 };
 135
 136 /* VBUS input current limits supported in AB8500 in mA */
 137 #define USB_CH_IP_CUR_LVL_0P05          50
 138 #define USB_CH_IP_CUR_LVL_0P09          98
 139 #define USB_CH_IP_CUR_LVL_0P19          193
 140 #define USB_CH_IP_CUR_LVL_0P29          290
 141 #define USB_CH_IP_CUR_LVL_0P38          380
 142 #define USB_CH_IP_CUR_LVL_0P45          450
 143 #define USB_CH_IP_CUR_LVL_0P5           500
 144 #define USB_CH_IP_CUR_LVL_0P6           600
 145 #define USB_CH_IP_CUR_LVL_0P7           700
 146 #define USB_CH_IP_CUR_LVL_0P8           800
 147 #define USB_CH_IP_CUR_LVL_0P9           900
 148 #define USB_CH_IP_CUR_LVL_1P0           1000
 149 #define USB_CH_IP_CUR_LVL_1P1           1100
 150 #define USB_CH_IP_CUR_LVL_1P3           1300
 151 #define USB_CH_IP_CUR_LVL_1P4           1400
 152 #define USB_CH_IP_CUR_LVL_1P5           1500
 153
 154 #define VBAT_TRESH_IP_CUR_RED           3800
 155
 156 #define to_ab8500_charger_usb_device_info(x) container_of((x), \
 157         struct ab8500_charger, usb_chg)
 158 #define to_ab8500_charger_ac_device_info(x) container_of((x), \
 159         struct ab8500_charger, ac_chg)
 160
 161 /**
 162  * struct ab8500_charger_interrupts - ab8500 interupts
 163  * @name:       name of the interrupt
 164  * @isr         function pointer to the isr
 165  */
 166 struct ab8500_charger_interrupts {
 167         char *name;
 168         irqreturn_t (*isr)(int irq, void *data);
 169 };
 170
 171 struct ab8500_charger_info {
 172         int charger_connected;
 173         int charger_online;
 174         int charger_voltage;
 175         int cv_active;
 176         bool wd_expired;
 177         int charger_current;
 178 };
 179
 180 struct ab8500_charger_event_flags {
 181         bool mainextchnotok;
 182         bool main_thermal_prot;
 183         bool usb_thermal_prot;
 184         bool vbus_ovv;
 185         bool usbchargernotok;
 186         bool chgwdexp;
 187         bool vbus_collapse;
 188         bool vbus_drop_end;
 189 };
 190
 191 struct ab8500_charger_usb_state {
 192         int usb_current;
 193         int usb_current_tmp;
 194         enum ab8500_usb_state state;
 195         enum ab8500_usb_state state_tmp;
 196         spinlock_t usb_lock;
 197 };
 198
 199 /**
 200  * struct ab8500_charger - ab8500 Charger device information
 201  * @dev:                Pointer to the structure device
 202  * @max_usb_in_curr:    Max USB charger input current
 203  * @vbus_detected:      VBUS detected
 204  * @vbus_detected_start:
 205  *                      VBUS detected during startup
 206  * @ac_conn:            This will be true when the AC charger has been plugged
 207  * @vddadc_en_ac:       Indicate if VDD ADC supply is enabled because AC
 208  *                      charger is enabled
 209  * @vddadc_en_usb:      Indicate if VDD ADC supply is enabled because USB
 210  *                      charger is enabled
 211  * @vbat                Battery voltage
 212  * @old_vbat            Previously measured battery voltage
 213  * @usb_device_is_unrecognised  USB device is unrecognised by the hardware
 214  * @autopower           Indicate if we should have automatic pwron after pwrloss
 215  * @autopower_cfg       platform specific power config support for "pwron after pwrloss"
 216  * @invalid_charger_detect_state State when forcing AB to use invalid charger
 217  * @is_usb_host:        Indicate if last detected USB type is host
 218  * @is_aca_rid:         Incicate if accessory is ACA type
 219  * @current_stepping_sessions:
 220  *                      Counter for current stepping sessions
 221  * @parent:             Pointer to the struct ab8500
 222  * @gpadc:              Pointer to the struct gpadc
 223  * @bm:                 Platform specific battery management information
 224  * @flags:              Structure for information about events triggered
 225  * @usb_state:          Structure for usb stack information
 226  * @ac_chg:             AC charger power supply
 227  * @usb_chg:            USB charger power supply
 228  * @ac:                 Structure that holds the AC charger properties
 229  * @usb:                Structure that holds the USB charger properties
 230  * @regu:               Pointer to the struct regulator
 231  * @charger_wq:         Work queue for the IRQs and checking HW state
 232  * @usb_ipt_crnt_lock:  Lock to protect VBUS input current setting from mutuals
 233  * @pm_lock:            Lock to prevent system to suspend
 234  * @check_vbat_work     Work for checking vbat threshold to adjust vbus current
 235  * @check_hw_failure_work:      Work for checking HW state
 236  * @check_usbchgnotok_work:     Work for checking USB charger not ok status
 237  * @kick_wd_work:               Work for kicking the charger watchdog in case
 238  *                              of ABB rev 1.* due to the watchog logic bug
 239  * @ac_charger_attached_work:   Work for checking if AC charger is still
 240  *                              connected
 241  * @usb_charger_attached_work:  Work for checking if USB charger is still
 242  *                              connected
 243  * @ac_work:                    Work for checking AC charger connection
 244  * @detect_usb_type_work:       Work for detecting the USB type connected
 245  * @usb_link_status_work:       Work for checking the new USB link status
 246  * @usb_state_changed_work:     Work for checking USB state
 247  * @attach_work:                Work for detecting USB type
 248  * @vbus_drop_end_work:         Work for detecting VBUS drop end
 249  * @check_main_thermal_prot_work:
 250  *                              Work for checking Main thermal status
 251  * @check_usb_thermal_prot_work:
 252  *                              Work for checking USB thermal status
 253  * @charger_attached_mutex:     For controlling the wakelock
 254  */
 255 struct ab8500_charger {
 256         struct device *dev;
 257         int max_usb_in_curr;
 258         bool vbus_detected;
 259         bool vbus_detected_start;
 260         bool ac_conn;
 261         bool vddadc_en_ac;
 262         bool vddadc_en_usb;
 263         int vbat;
 264         int old_vbat;
 265         bool usb_device_is_unrecognised;
 266         bool autopower;
 267         bool autopower_cfg;
 268         int invalid_charger_detect_state;
 269         bool is_usb_host;
 270         int is_aca_rid;
 271         atomic_t current_stepping_sessions;
 272         struct ab8500 *parent;
 273         struct ab8500_gpadc *gpadc;
 274         struct abx500_bm_data *bm;
 275         struct ab8500_charger_event_flags flags;
 276         struct ab8500_charger_usb_state usb_state;
 277         struct ux500_charger ac_chg;
 278         struct ux500_charger usb_chg;
 279         struct ab8500_charger_info ac;
 280         struct ab8500_charger_info usb;
 281         struct regulator *regu;
 282         struct workqueue_struct *charger_wq;
 283         struct mutex usb_ipt_crnt_lock;
 284         struct delayed_work check_vbat_work;
 285         struct delayed_work check_hw_failure_work;
 286         struct delayed_work check_usbchgnotok_work;
 287         struct delayed_work kick_wd_work;
 288         struct delayed_work usb_state_changed_work;
 289         struct delayed_work attach_work;
 290         struct delayed_work ac_charger_attached_work;
 291         struct delayed_work usb_charger_attached_work;
 292         struct delayed_work vbus_drop_end_work;
 293         struct work_struct ac_work;
 294         struct work_struct detect_usb_type_work;
 295         struct work_struct usb_link_status_work;
 296         struct work_struct check_main_thermal_prot_work;
 297         struct work_struct check_usb_thermal_prot_work;
 298         struct usb_phy *usb_phy;
 299         struct notifier_block nb;
 300         struct mutex charger_attached_mutex;
 301 };
 302
 303 /* AC properties */
 304 static enum power_supply_property ab8500_charger_ac_props[] = {
 305         POWER_SUPPLY_PROP_HEALTH,
 306         POWER_SUPPLY_PROP_PRESENT,
 307         POWER_SUPPLY_PROP_ONLINE,
 308         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 309         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 310         POWER_SUPPLY_PROP_CURRENT_NOW,
 311 };
 312
 313 /* USB properties */
 314 static enum power_supply_property ab8500_charger_usb_props[] = {
 315         POWER_SUPPLY_PROP_HEALTH,
 316         POWER_SUPPLY_PROP_CURRENT_AVG,
 317         POWER_SUPPLY_PROP_PRESENT,
 318         POWER_SUPPLY_PROP_ONLINE,
 319         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 320         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 321         POWER_SUPPLY_PROP_CURRENT_NOW,
 322 };
 323
 324 /*
 325  * Function for enabling and disabling sw fallback mode
 326  * should always be disabled when no charger is connected.
 327  */
 328 static void ab8500_enable_disable_sw_fallback(struct ab8500_charger *di,
 329                 bool fallback)
 330 {
 331         u8 val;
 332         u8 reg;
 333         u8 bank;
 334         u8 bit;
 335         int ret;
 336
 337         dev_dbg(di->dev, "SW Fallback: %d\n", fallback);
 338
 339         if (is_ab8500(di->parent)) {
 340                 bank = 0x15;
 341                 reg = 0x0;
 342                 bit = 3;
 343         } else {
 344                 bank = AB8500_SYS_CTRL1_BLOCK;
 345                 reg = AB8500_SW_CONTROL_FALLBACK;
 346                 bit = 0;
 347         }
 348
 349         /* read the register containing fallback bit */
 350         ret = abx500_get_register_interruptible(di->dev, bank, reg, &val);
 351         if (ret < 0) {
 352                 dev_err(di->dev, "%d read failed\n", __LINE__);
 353                 return;
 354         }
 355
 356         if (is_ab8500(di->parent)) {
 357                 /* enable the OPT emulation registers */
 358                 ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x2);
 359                 if (ret) {
 360                         dev_err(di->dev, "%d write failed\n", __LINE__);
 361                         goto disable_otp;
 362                 }
 363         }
 364
 365         if (fallback)
 366                 val |= (1 << bit);
 367         else
 368                 val &= ~(1 << bit);
 369
 370         /* write back the changed fallback bit value to register */
 371         ret = abx500_set_register_interruptible(di->dev, bank, reg, val);
 372         if (ret) {
 373                 dev_err(di->dev, "%d write failed\n", __LINE__);
 374         }
 375
 376 disable_otp:
 377         if (is_ab8500(di->parent)) {
 378                 /* disable the set OTP registers again */
 379                 ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x0);
 380                 if (ret) {
 381                         dev_err(di->dev, "%d write failed\n", __LINE__);
 382                 }
 383         }
 384 }
 385
 386 /**
 387  * ab8500_power_supply_changed - a wrapper with local extentions for
 388  * power_supply_changed
 389  * @di:   pointer to the ab8500_charger structure
 390  * @psy:  pointer to power_supply_that have changed.
 391  *
 392  */
 393 static void ab8500_power_supply_changed(struct ab8500_charger *di,
 394                                         struct power_supply *psy)
 395 {
 396         if (di->autopower_cfg) {
 397                 if (!di->usb.charger_connected &&
 398                     !di->ac.charger_connected &&
 399                     di->autopower) {
 400                         di->autopower = false;
 401                         ab8500_enable_disable_sw_fallback(di, false);
 402                 } else if (!di->autopower &&
 403                            (di->ac.charger_connected ||
 404                             di->usb.charger_connected)) {
 405                         di->autopower = true;
 406                         ab8500_enable_disable_sw_fallback(di, true);
 407                 }
 408         }
 409         power_supply_changed(psy);
 410 }
 411
 412 static void ab8500_charger_set_usb_connected(struct ab8500_charger *di,
 413         bool connected)
 414 {
 415         if (connected != di->usb.charger_connected) {
 416                 dev_dbg(di->dev, "USB connected:%i\n", connected);
 417                 di->usb.charger_connected = connected;
 418                 sysfs_notify(&di->usb_chg.psy.dev->kobj, NULL, "present");
 419
 420                 if (connected) {
 421                         mutex_lock(&di->charger_attached_mutex);
 422                         mutex_unlock(&di->charger_attached_mutex);
 423
 424                         queue_delayed_work(di->charger_wq,
 425                                            &di->usb_charger_attached_work,
 426                                            HZ);
 427                 } else {
 428                         cancel_delayed_work_sync(&di->usb_charger_attached_work);
 429                         mutex_lock(&di->charger_attached_mutex);
 430                         mutex_unlock(&di->charger_attached_mutex);
 431                 }
 432         }
 433 }
 434
 435 /**
 436  * ab8500_charger_get_ac_voltage() - get ac charger voltage
 437  * @di:         pointer to the ab8500_charger structure
 438  *
 439  * Returns ac charger voltage (on success)
 440  */
 441 static int ab8500_charger_get_ac_voltage(struct ab8500_charger *di)
 442 {
 443         int vch;
 444
 445         /* Only measure voltage if the charger is connected */
 446         if (di->ac.charger_connected) {
 447                 vch = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_V);
 448                 if (vch < 0)
 449                         dev_err(di->dev, "%s gpadc conv failed,\n", __func__);
 450         } else {
 451                 vch = 0;
 452         }
 453         return vch;
 454 }
 455
 456 /**
 457  * ab8500_charger_ac_cv() - check if the main charger is in CV mode
 458  * @di:         pointer to the ab8500_charger structure
 459  *
 460  * Returns ac charger CV mode (on success) else error code
 461  */
 462 static int ab8500_charger_ac_cv(struct ab8500_charger *di)
 463 {
 464         u8 val;
 465         int ret = 0;
 466
 467         /* Only check CV mode if the charger is online */
 468         if (di->ac.charger_online) {
 469                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 470                         AB8500_CH_STATUS1_REG, &val);
 471                 if (ret < 0) {
 472                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 473                         return 0;
 474                 }
 475
 476                 if (val & MAIN_CH_CV_ON)
 477                         ret = 1;
 478                 else
 479                         ret = 0;
 480         }
 481
 482         return ret;
 483 }
 484
 485 /**
 486  * ab8500_charger_get_vbus_voltage() - get vbus voltage
 487  * @di:         pointer to the ab8500_charger structure
 488  *
 489  * This function returns the vbus voltage.
 490  * Returns vbus voltage (on success)
 491  */
 492 static int ab8500_charger_get_vbus_voltage(struct ab8500_charger *di)
 493 {
 494         int vch;
 495
 496         /* Only measure voltage if the charger is connected */
 497         if (di->usb.charger_connected) {
 498                 vch = ab8500_gpadc_convert(di->gpadc, VBUS_V);
 499                 if (vch < 0)
 500                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 501         } else {
 502                 vch = 0;
 503         }
 504         return vch;
 505 }
 506
 507 /**
 508  * ab8500_charger_get_usb_current() - get usb charger current
 509  * @di:         pointer to the ab8500_charger structure
 510  *
 511  * This function returns the usb charger current.
 512  * Returns usb current (on success) and error code on failure
 513  */
 514 static int ab8500_charger_get_usb_current(struct ab8500_charger *di)
 515 {
 516         int ich;
 517
 518         /* Only measure current if the charger is online */
 519         if (di->usb.charger_online) {
 520                 ich = ab8500_gpadc_convert(di->gpadc, USB_CHARGER_C);
 521                 if (ich < 0)
 522                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 523         } else {
 524                 ich = 0;
 525         }
 526         return ich;
 527 }
 528
 529 /**
 530  * ab8500_charger_get_ac_current() - get ac charger current
 531  * @di:         pointer to the ab8500_charger structure
 532  *
 533  * This function returns the ac charger current.
 534  * Returns ac current (on success) and error code on failure.
 535  */
 536 static int ab8500_charger_get_ac_current(struct ab8500_charger *di)
 537 {
 538         int ich;
 539
 540         /* Only measure current if the charger is online */
 541         if (di->ac.charger_online) {
 542                 ich = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_C);
 543                 if (ich < 0)
 544                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 545         } else {
 546                 ich = 0;
 547         }
 548         return ich;
 549 }
 550
 551 /**
 552  * ab8500_charger_usb_cv() - check if the usb charger is in CV mode
 553  * @di:         pointer to the ab8500_charger structure
 554  *
 555  * Returns ac charger CV mode (on success) else error code
 556  */
 557 static int ab8500_charger_usb_cv(struct ab8500_charger *di)
 558 {
 559         int ret;
 560         u8 val;
 561
 562         /* Only check CV mode if the charger is online */
 563         if (di->usb.charger_online) {
 564                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 565                         AB8500_CH_USBCH_STAT1_REG, &val);
 566                 if (ret < 0) {
 567                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 568                         return 0;
 569                 }
 570
 571                 if (val & USB_CH_CV_ON)
 572                         ret = 1;
 573                 else
 574                         ret = 0;
 575         } else {
 576                 ret = 0;
 577         }
 578
 579         return ret;
 580 }
 581
 582 /**
 583  * ab8500_charger_detect_chargers() - Detect the connected chargers
 584  * @di:         pointer to the ab8500_charger structure
 585  * @probe:      if probe, don't delay and wait for HW
 586  *
 587  * Returns the type of charger connected.
 588  * For USB it will not mean we can actually charge from it
 589  * but that there is a USB cable connected that we have to
 590  * identify. This is used during startup when we don't get
 591  * interrupts of the charger detection
 592  *
 593  * Returns an integer value, that means,
 594  * NO_PW_CONN  no power supply is connected
 595  * AC_PW_CONN  if the AC power supply is connected
 596  * USB_PW_CONN  if the USB power supply is connected
 597  * AC_PW_CONN + USB_PW_CONN if USB and AC power supplies are both connected
 598  */
 599 static int ab8500_charger_detect_chargers(struct ab8500_charger *di, bool probe)
 600 {
 601         int result = NO_PW_CONN;
 602         int ret;
 603         u8 val;
 604
 605         /* Check for AC charger */
 606         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 607                 AB8500_CH_STATUS1_REG, &val);
 608         if (ret < 0) {
 609                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 610                 return ret;
 611         }
 612
 613         if (val & MAIN_CH_DET)
 614                 result = AC_PW_CONN;
 615
 616         /* Check for USB charger */
 617
 618         if (!probe) {
 619                 /*
 620                  * AB8500 says VBUS_DET_DBNC1 & VBUS_DET_DBNC100
 621                  * when disconnecting ACA even though no
 622                  * charger was connected. Try waiting a little
 623                  * longer than the 100 ms of VBUS_DET_DBNC100...
 624                  */
 625                 msleep(110);
 626         }
 627         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 628                 AB8500_CH_USBCH_STAT1_REG, &val);
 629         if (ret < 0) {
 630                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 631                 return ret;
 632         }
 633         dev_dbg(di->dev,
 634                 "%s AB8500_CH_USBCH_STAT1_REG %x\n", __func__,
 635                 val);
 636         if ((val & VBUS_DET_DBNC1) && (val & VBUS_DET_DBNC100))
 637                 result |= USB_PW_CONN;
 638
 639         return result;
 640 }
 641
 642 /**
 643  * ab8500_charger_max_usb_curr() - get the max curr for the USB type
 644  * @di:                 pointer to the ab8500_charger structure
 645  * @link_status:        the identified USB type
 646  *
 647  * Get the maximum current that is allowed to be drawn from the host
 648  * based on the USB type.
 649  * Returns error code in case of failure else 0 on success
 650  */
 651 static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
 652                 enum ab8500_charger_link_status link_status)
 653 {
 654         int ret = 0;
 655
 656         di->usb_device_is_unrecognised = false;
 657
 658         /*
 659          * Platform only supports USB 2.0.
 660          * This means that charging current from USB source
 661          * is maximum 500 mA. Every occurence of USB_STAT_*_HOST_*
 662          * should set USB_CH_IP_CUR_LVL_0P5.
 663          */
 664
 665         switch (link_status) {
 666         case USB_STAT_STD_HOST_NC:
 667         case USB_STAT_STD_HOST_C_NS:
 668         case USB_STAT_STD_HOST_C_S:
 669                 dev_dbg(di->dev, "USB Type - Standard host is "
 670                         "detected through USB driver\n");
 671                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
 672                 di->is_usb_host = true;
 673                 di->is_aca_rid = 0;
 674                 break;
 675         case USB_STAT_HOST_CHG_HS_CHIRP:
 676                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
 677                 di->is_usb_host = true;
 678                 di->is_aca_rid = 0;
 679                 break;
 680         case USB_STAT_HOST_CHG_HS:
 681                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
 682                 di->is_usb_host = true;
 683                 di->is_aca_rid = 0;
 684                 break;
 685         case USB_STAT_ACA_RID_C_HS:
 686                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P9;
 687                 di->is_usb_host = false;
 688                 di->is_aca_rid = 0;
 689                 break;
 690         case USB_STAT_ACA_RID_A:
 691                 /*
 692                  * Dedicated charger level minus maximum current accessory
 693                  * can consume (900mA). Closest level is 500mA
 694                  */
 695                 dev_dbg(di->dev, "USB_STAT_ACA_RID_A detected\n");
 696                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
 697                 di->is_usb_host = false;
 698                 di->is_aca_rid = 1;
 699                 break;
 700         case USB_STAT_ACA_RID_B:
 701                 /*
 702                  * Dedicated charger level minus 120mA (20mA for ACA and
 703                  * 100mA for potential accessory). Closest level is 1300mA
 704                  */
 705                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_1P3;
 706                 dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
 707                                 di->max_usb_in_curr);
 708                 di->is_usb_host = false;
 709                 di->is_aca_rid = 1;
 710                 break;
 711         case USB_STAT_HOST_CHG_NM:
 712                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
 713                 di->is_usb_host = true;
 714                 di->is_aca_rid = 0;
 715                 break;
 716         case USB_STAT_DEDICATED_CHG:
 717                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_1P5;
 718                 di->is_usb_host = false;
 719                 di->is_aca_rid = 0;
 720                 break;
 721         case USB_STAT_ACA_RID_C_HS_CHIRP:
 722         case USB_STAT_ACA_RID_C_NM:
 723                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_1P5;
 724                 di->is_usb_host = false;
 725                 di->is_aca_rid = 1;
 726                 break;
 727         case USB_STAT_NOT_CONFIGURED:
 728                 if (di->vbus_detected) {
 729                         di->usb_device_is_unrecognised = true;
 730                         dev_dbg(di->dev, "USB Type - Legacy charger.\n");
 731                         di->max_usb_in_curr = USB_CH_IP_CUR_LVL_1P5;
 732                         break;
 733                 }
 734         case USB_STAT_HM_IDGND:
 735                 dev_err(di->dev, "USB Type - Charging not allowed\n");
 736                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P05;
 737                 ret = -ENXIO;
 738                 break;
 739         case USB_STAT_RESERVED:
 740                 if (is_ab8500(di->parent)) {
 741                         di->flags.vbus_collapse = true;
 742                         dev_err(di->dev, "USB Type - USB_STAT_RESERVED "
 743                                                 "VBUS has collapsed\n");
 744                         ret = -ENXIO;
 745                         break;
 746                 }
 747                 if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
 748                         dev_dbg(di->dev, "USB Type - Charging not allowed\n");
 749                         di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P05;
 750                         dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
 751                                         link_status, di->max_usb_in_curr);
 752                         ret = -ENXIO;
 753                         break;
 754                 }
 755                 break;
 756         case USB_STAT_CARKIT_1:
 757         case USB_STAT_CARKIT_2:
 758         case USB_STAT_ACA_DOCK_CHARGER:
 759         case USB_STAT_CHARGER_LINE_1:
 760                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
 761                 dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
 762                                 di->max_usb_in_curr);
 763         case USB_STAT_NOT_VALID_LINK:
 764                 dev_err(di->dev, "USB Type invalid - try charging anyway\n");
 765                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
 766                 break;
 767
 768         default:
 769                 dev_err(di->dev, "USB Type - Unknown\n");
 770                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P05;
 771                 ret = -ENXIO;
 772                 break;
 773         };
 774
 775         dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
 776                 link_status, di->max_usb_in_curr);
 777
 778         return ret;
 779 }
 780
 781 /**
 782  * ab8500_charger_read_usb_type() - read the type of usb connected
 783  * @di:         pointer to the ab8500_charger structure
 784  *
 785  * Detect the type of the plugged USB
 786  * Returns error code in case of failure else 0 on success
 787  */
 788 static int ab8500_charger_read_usb_type(struct ab8500_charger *di)
 789 {
 790         int ret;
 791         u8 val;
 792
 793         ret = abx500_get_register_interruptible(di->dev,
 794                 AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG, &val);
 795         if (ret < 0) {
 796                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 797                 return ret;
 798         }
 799         if (is_ab8500(di->parent)) {
 800                 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
 801                                 AB8500_USB_LINE_STAT_REG, &val);
 802         } else {
 803                 if (is_ab9540(di->parent) || is_ab8505(di->parent))
 804                         ret = abx500_get_register_interruptible(di->dev,
 805                                 AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
 806         }
 807         if (ret < 0) {
 808                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 809                 return ret;
 810         }
 811
 812         /* get the USB type */
 813         val = (val & AB8500_USB_LINK_STATUS) >> 3;
 814         ret = ab8500_charger_max_usb_curr(di,
 815                 (enum ab8500_charger_link_status) val);
 816
 817         return ret;
 818 }
 819
 820 /**
 821  * ab8500_charger_detect_usb_type() - get the type of usb connected
 822  * @di:         pointer to the ab8500_charger structure
 823  *
 824  * Detect the type of the plugged USB
 825  * Returns error code in case of failure else 0 on success
 826  */
 827 static int ab8500_charger_detect_usb_type(struct ab8500_charger *di)
 828 {
 829         int i, ret;
 830         u8 val;
 831
 832         /*
 833          * On getting the VBUS rising edge detect interrupt there
 834          * is a 250ms delay after which the register UsbLineStatus
 835          * is filled with valid data.
 836          */
 837         for (i = 0; i < 10; i++) {
 838                 msleep(250);
 839                 ret = abx500_get_register_interruptible(di->dev,
 840                         AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG,
 841                         &val);
 842                 dev_dbg(di->dev, "%s AB8500_IT_SOURCE21_REG %x\n",
 843                         __func__, val);
 844                 if (ret < 0) {
 845                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 846                         return ret;
 847                 }
 848
 849                 if (is_ab8500(di->parent))
 850                         ret = abx500_get_register_interruptible(di->dev,
 851                                 AB8500_USB, AB8500_USB_LINE_STAT_REG, &val);
 852                 else
 853                         ret = abx500_get_register_interruptible(di->dev,
 854                                 AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
 855                 if (ret < 0) {
 856                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 857                         return ret;
 858                 }
 859                 dev_dbg(di->dev, "%s AB8500_USB_LINE_STAT_REG %x\n", __func__,
 860                         val);
 861                 /*
 862                  * Until the IT source register is read the UsbLineStatus
 863                  * register is not updated, hence doing the same
 864                  * Revisit this:
 865                  */
 866
 867                 /* get the USB type */
 868                 val = (val & AB8500_USB_LINK_STATUS) >> 3;
 869                 if (val)
 870                         break;
 871         }
 872         ret = ab8500_charger_max_usb_curr(di,
 873                 (enum ab8500_charger_link_status) val);
 874
 875         return ret;
 876 }
 877
 878 /*
 879  * This array maps the raw hex value to charger voltage used by the AB8500
 880  * Values taken from the UM0836
 881  */
 882 static int ab8500_charger_voltage_map[] = {
 883         3500 ,
 884         3525 ,
 885         3550 ,
 886         3575 ,
 887         3600 ,
 888         3625 ,
 889         3650 ,
 890         3675 ,
 891         3700 ,
 892         3725 ,
 893         3750 ,
 894         3775 ,
 895         3800 ,
 896         3825 ,
 897         3850 ,
 898         3875 ,
 899         3900 ,
 900         3925 ,
 901         3950 ,
 902         3975 ,
 903         4000 ,
 904         4025 ,
 905         4050 ,
 906         4060 ,
 907         4070 ,
 908         4080 ,
 909         4090 ,
 910         4100 ,
 911         4110 ,
 912         4120 ,
 913         4130 ,
 914         4140 ,
 915         4150 ,
 916         4160 ,
 917         4170 ,
 918         4180 ,
 919         4190 ,
 920         4200 ,
 921         4210 ,
 922         4220 ,
 923         4230 ,
 924         4240 ,
 925         4250 ,
 926         4260 ,
 927         4270 ,
 928         4280 ,
 929         4290 ,
 930         4300 ,
 931         4310 ,
 932         4320 ,
 933         4330 ,
 934         4340 ,
 935         4350 ,
 936         4360 ,
 937         4370 ,
 938         4380 ,
 939         4390 ,
 940         4400 ,
 941         4410 ,
 942         4420 ,
 943         4430 ,
 944         4440 ,
 945         4450 ,
 946         4460 ,
 947         4470 ,
 948         4480 ,
 949         4490 ,
 950         4500 ,
 951         4510 ,
 952         4520 ,
 953         4530 ,
 954         4540 ,
 955         4550 ,
 956         4560 ,
 957         4570 ,
 958         4580 ,
 959         4590 ,
 960         4600 ,
 961 };
 962
 963 /*
 964  * This array maps the raw hex value to charger current used by the AB8500
 965  * Values taken from the UM0836
 966  */
 967 static int ab8500_charger_current_map[] = {
 968         100 ,
 969         200 ,
 970         300 ,
 971         400 ,
 972         500 ,
 973         600 ,
 974         700 ,
 975         800 ,
 976         900 ,
 977         1000 ,
 978         1100 ,
 979         1200 ,
 980         1300 ,
 981         1400 ,
 982         1500 ,
 983 };
 984
 985 /*
 986  * This array maps the raw hex value to VBUS input current used by the AB8500
 987  * Values taken from the UM0836
 988  */
 989 static int ab8500_charger_vbus_in_curr_map[] = {
 990         USB_CH_IP_CUR_LVL_0P05,
 991         USB_CH_IP_CUR_LVL_0P09,
 992         USB_CH_IP_CUR_LVL_0P19,
 993         USB_CH_IP_CUR_LVL_0P29,
 994         USB_CH_IP_CUR_LVL_0P38,
 995         USB_CH_IP_CUR_LVL_0P45,
 996         USB_CH_IP_CUR_LVL_0P5,
 997         USB_CH_IP_CUR_LVL_0P6,
 998         USB_CH_IP_CUR_LVL_0P7,
 999         USB_CH_IP_CUR_LVL_0P8,
1000         USB_CH_IP_CUR_LVL_0P9,
1001         USB_CH_IP_CUR_LVL_1P0,
1002         USB_CH_IP_CUR_LVL_1P1,
1003         USB_CH_IP_CUR_LVL_1P3,
1004         USB_CH_IP_CUR_LVL_1P4,
1005         USB_CH_IP_CUR_LVL_1P5,
1006 };
1007
1008 static int ab8500_voltage_to_regval(int voltage)
1009 {
1010         int i;
1011
1012         /* Special case for voltage below 3.5V */
1013         if (voltage < ab8500_charger_voltage_map[0])
1014                 return LOW_VOLT_REG;
1015
1016         for (i = 1; i < ARRAY_SIZE(ab8500_charger_voltage_map); i++) {
1017                 if (voltage < ab8500_charger_voltage_map[i])
1018                         return i - 1;
1019         }
1020
1021         /* If not last element, return error */
1022         i = ARRAY_SIZE(ab8500_charger_voltage_map) - 1;
1023         if (voltage == ab8500_charger_voltage_map[i])
1024                 return i;
1025         else
1026                 return -1;
1027 }
1028
1029 static int ab8500_current_to_regval(int curr)
1030 {
1031         int i;
1032
1033         if (curr < ab8500_charger_current_map[0])
1034                 return 0;
1035
1036         for (i = 0; i < ARRAY_SIZE(ab8500_charger_current_map); i++) {
1037                 if (curr < ab8500_charger_current_map[i])
1038                         return i - 1;
1039         }
1040
1041         /* If not last element, return error */
1042         i = ARRAY_SIZE(ab8500_charger_current_map) - 1;
1043         if (curr == ab8500_charger_current_map[i])
1044                 return i;
1045         else
1046                 return -1;
1047 }
1048
1049 static int ab8500_vbus_in_curr_to_regval(int curr)
1050 {
1051         int i;
1052
1053         if (curr < ab8500_charger_vbus_in_curr_map[0])
1054                 return 0;
1055
1056         for (i = 0; i < ARRAY_SIZE(ab8500_charger_vbus_in_curr_map); i++) {
1057                 if (curr < ab8500_charger_vbus_in_curr_map[i])
1058                         return i - 1;
1059         }
1060
1061         /* If not last element, return error */
1062         i = ARRAY_SIZE(ab8500_charger_vbus_in_curr_map) - 1;
1063         if (curr == ab8500_charger_vbus_in_curr_map[i])
1064                 return i;
1065         else
1066                 return -1;
1067 }
1068
1069 /**
1070  * ab8500_charger_get_usb_cur() - get usb current
1071  * @di:         pointer to the ab8500_charger structre
1072  *
1073  * The usb stack provides the maximum current that can be drawn from
1074  * the standard usb host. This will be in mA.
1075  * This function converts current in mA to a value that can be written
1076  * to the register. Returns -1 if charging is not allowed
1077  */
1078 static int ab8500_charger_get_usb_cur(struct ab8500_charger *di)
1079 {
1080         switch (di->usb_state.usb_current) {
1081         case 100:
1082                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P09;
1083                 break;
1084         case 200:
1085                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P19;
1086                 break;
1087         case 300:
1088                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P29;
1089                 break;
1090         case 400:
1091                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P38;
1092                 break;
1093         case 500:
1094                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
1095                 break;
1096         default:
1097                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P05;
1098                 return -1;
1099                 break;
1100         };
1101         return 0;
1102 }
1103
1104 /**
1105  * ab8500_charger_set_current() - set charger current
1106  * @di:         pointer to the ab8500_charger structure
1107  * @ich:        charger current, in mA
1108  * @reg:        select what charger register to set
1109  *
1110  * Set charger current.
1111  * There is no state machine in the AB to step up/down the charger
1112  * current to avoid dips and spikes on MAIN, VBUS and VBAT when
1113  * charging is started. Instead we need to implement
1114  * this charger current step-up/down here.
1115  * Returns error code in case of failure else 0(on success)
1116  */
1117 static int ab8500_charger_set_current(struct ab8500_charger *di,
1118         int ich, int reg)
1119 {
1120         int ret = 0;
1121         int auto_curr_index, curr_index, prev_curr_index, shift_value, i;
1122         u8 reg_value;
1123         u32 step_udelay;
1124         bool no_stepping = false;
1125
1126         atomic_inc(&di->current_stepping_sessions);
1127
1128         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1129                 reg, &reg_value);
1130         if (ret < 0) {
1131                 dev_err(di->dev, "%s read failed\n", __func__);
1132                 goto exit_set_current;
1133         }
1134
1135         switch (reg) {
1136         case AB8500_MCH_IPT_CURLVL_REG:
1137                 shift_value = MAIN_CH_INPUT_CURR_SHIFT;
1138                 prev_curr_index = (reg_value >> shift_value);
1139                 curr_index = ab8500_current_to_regval(ich);
1140                 step_udelay = STEP_UDELAY;
1141                 if (!di->ac.charger_connected)
1142                         no_stepping = true;
1143                 break;
1144         case AB8500_USBCH_IPT_CRNTLVL_REG:
1145                 shift_value = VBUS_IN_CURR_LIM_SHIFT;
1146                 prev_curr_index = (reg_value >> shift_value);
1147                 curr_index = ab8500_vbus_in_curr_to_regval(ich);
1148                 step_udelay = STEP_UDELAY * 100;
1149
1150                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1151                                         AB8500_CH_USBCH_STAT2_REG, &reg_value);
1152                 if (ret < 0) {
1153                         dev_err(di->dev, "%s read failed\n", __func__);
1154                         goto exit_set_current;
1155                 }
1156                 auto_curr_index =
1157                         reg_value >> AUTO_VBUS_IN_CURR_LIM_SHIFT;
1158
1159                 dev_dbg(di->dev, "%s Auto VBUS curr is %d mA\n",
1160                         __func__,
1161                         ab8500_charger_vbus_in_curr_map[auto_curr_index]);
1162
1163                 prev_curr_index = min(prev_curr_index, auto_curr_index);
1164
1165                 if (!di->usb.charger_connected)
1166                         no_stepping = true;
1167                 break;
1168         case AB8500_CH_OPT_CRNTLVL_REG:
1169                 shift_value = 0;
1170                 prev_curr_index = (reg_value >> shift_value);
1171                 curr_index = ab8500_current_to_regval(ich);
1172                 step_udelay = STEP_UDELAY;
1173                 if (curr_index && (curr_index - prev_curr_index) > 1)
1174                         step_udelay *= 100;
1175
1176                 if (!di->usb.charger_connected && !di->ac.charger_connected)
1177                         no_stepping = true;
1178
1179                 break;
1180         default:
1181                 dev_err(di->dev, "%s current register not valid\n", __func__);
1182                 ret = -ENXIO;
1183                 goto exit_set_current;
1184         }
1185
1186         if (curr_index < 0) {
1187                 dev_err(di->dev, "requested current limit out-of-range\n");
1188                 ret = -ENXIO;
1189                 goto exit_set_current;
1190         }
1191
1192         /* only update current if it's been changed */
1193         if (prev_curr_index == curr_index) {
1194                 dev_dbg(di->dev, "%s current not changed for reg: 0x%02x\n",
1195                         __func__, reg);
1196                 ret = 0;
1197                 goto exit_set_current;
1198         }
1199
1200         dev_dbg(di->dev, "%s set charger current: %d mA for reg: 0x%02x\n",
1201                 __func__, ich, reg);
1202
1203         if (no_stepping) {
1204                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1205                                         reg, (u8)curr_index << shift_value);
1206                 if (ret)
1207                         dev_err(di->dev, "%s write failed\n", __func__);
1208         } else if (prev_curr_index > curr_index) {
1209                 for (i = prev_curr_index - 1; i >= curr_index; i--) {
1210                         dev_dbg(di->dev, "curr change_1 to: %x for 0x%02x\n",
1211                                 (u8) i << shift_value, reg);
1212                         ret = abx500_set_register_interruptible(di->dev,
1213                                 AB8500_CHARGER, reg, (u8)i << shift_value);
1214                         if (ret) {
1215                                 dev_err(di->dev, "%s write failed\n", __func__);
1216                                 goto exit_set_current;
1217                         }
1218                         if (i != curr_index)
1219                                 usleep_range(step_udelay, step_udelay * 2);
1220                 }
1221         } else {
1222                 for (i = prev_curr_index + 1; i <= curr_index; i++) {
1223                         dev_dbg(di->dev, "curr change_2 to: %x for 0x%02x\n",
1224                                 (u8)i << shift_value, reg);
1225                         ret = abx500_set_register_interruptible(di->dev,
1226                                 AB8500_CHARGER, reg, (u8)i << shift_value);
1227                         if (ret) {
1228                                 dev_err(di->dev, "%s write failed\n", __func__);
1229                                 goto exit_set_current;
1230                         }
1231                         if (i != curr_index)
1232                                 usleep_range(step_udelay, step_udelay * 2);
1233                 }
1234         }
1235
1236 exit_set_current:
1237         atomic_dec(&di->current_stepping_sessions);
1238
1239         return ret;
1240 }
1241
1242 /**
1243  * ab8500_charger_set_vbus_in_curr() - set VBUS input current limit
1244  * @di:         pointer to the ab8500_charger structure
1245  * @ich_in:     charger input current limit
1246  *
1247  * Sets the current that can be drawn from the USB host
1248  * Returns error code in case of failure else 0(on success)
1249  */
1250 static int ab8500_charger_set_vbus_in_curr(struct ab8500_charger *di,
1251                 int ich_in)
1252 {
1253         int min_value;
1254         int ret;
1255
1256         /* We should always use to lowest current limit */
1257         min_value = min(di->bm->chg_params->usb_curr_max, ich_in);
1258
1259         switch (min_value) {
1260         case 100:
1261                 if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1262                         min_value = USB_CH_IP_CUR_LVL_0P05;
1263                 break;
1264         case 500:
1265                 if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1266                         min_value = USB_CH_IP_CUR_LVL_0P45;
1267                 break;
1268         default:
1269                 break;
1270         }
1271
1272         dev_info(di->dev, "VBUS input current limit set to %d mA\n", min_value);
1273
1274         mutex_lock(&di->usb_ipt_crnt_lock);
1275         ret = ab8500_charger_set_current(di, min_value,
1276                 AB8500_USBCH_IPT_CRNTLVL_REG);
1277         mutex_unlock(&di->usb_ipt_crnt_lock);
1278
1279         return ret;
1280 }
1281
1282 /**
1283  * ab8500_charger_set_main_in_curr() - set main charger input current
1284  * @di:         pointer to the ab8500_charger structure
1285  * @ich_in:     input charger current, in mA
1286  *
1287  * Set main charger input current.
1288  * Returns error code in case of failure else 0(on success)
1289  */
1290 static int ab8500_charger_set_main_in_curr(struct ab8500_charger *di,
1291         int ich_in)
1292 {
1293         return ab8500_charger_set_current(di, ich_in,
1294                 AB8500_MCH_IPT_CURLVL_REG);
1295 }
1296
1297 /**
1298  * ab8500_charger_set_output_curr() - set charger output current
1299  * @di:         pointer to the ab8500_charger structure
1300  * @ich_out:    output charger current, in mA
1301  *
1302  * Set charger output current.
1303  * Returns error code in case of failure else 0(on success)
1304  */
1305 static int ab8500_charger_set_output_curr(struct ab8500_charger *di,
1306         int ich_out)
1307 {
1308         return ab8500_charger_set_current(di, ich_out,
1309                 AB8500_CH_OPT_CRNTLVL_REG);
1310 }
1311
1312 /**
1313  * ab8500_charger_led_en() - turn on/off chargign led
1314  * @di:         pointer to the ab8500_charger structure
1315  * @on:         flag to turn on/off the chargign led
1316  *
1317  * Power ON/OFF charging LED indication
1318  * Returns error code in case of failure else 0(on success)
1319  */
1320 static int ab8500_charger_led_en(struct ab8500_charger *di, int on)
1321 {
1322         int ret;
1323
1324         if (on) {
1325                 /* Power ON charging LED indicator, set LED current to 5mA */
1326                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1327                         AB8500_LED_INDICATOR_PWM_CTRL,
1328                         (LED_IND_CUR_5MA | LED_INDICATOR_PWM_ENA));
1329                 if (ret) {
1330                         dev_err(di->dev, "Power ON LED failed\n");
1331                         return ret;
1332                 }
1333                 /* LED indicator PWM duty cycle 252/256 */
1334                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1335                         AB8500_LED_INDICATOR_PWM_DUTY,
1336                         LED_INDICATOR_PWM_DUTY_252_256);
1337                 if (ret) {
1338                         dev_err(di->dev, "Set LED PWM duty cycle failed\n");
1339                         return ret;
1340                 }
1341         } else {
1342                 /* Power off charging LED indicator */
1343                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1344                         AB8500_LED_INDICATOR_PWM_CTRL,
1345                         LED_INDICATOR_PWM_DIS);
1346                 if (ret) {
1347                         dev_err(di->dev, "Power-off LED failed\n");
1348                         return ret;
1349                 }
1350         }
1351
1352         return ret;
1353 }
1354
1355 /**
1356  * ab8500_charger_ac_en() - enable or disable ac charging
1357  * @di:         pointer to the ab8500_charger structure
1358  * @enable:     enable/disable flag
1359  * @vset:       charging voltage
1360  * @iset:       charging current
1361  *
1362  * Enable/Disable AC/Mains charging and turns on/off the charging led
1363  * respectively.
1364  **/
1365 static int ab8500_charger_ac_en(struct ux500_charger *charger,
1366         int enable, int vset, int iset)
1367 {
1368         int ret;
1369         int volt_index;
1370         int curr_index;
1371         int input_curr_index;
1372         u8 overshoot = 0;
1373
1374         struct ab8500_charger *di = to_ab8500_charger_ac_device_info(charger);
1375
1376         if (enable) {
1377                 /* Check if AC is connected */
1378                 if (!di->ac.charger_connected) {
1379                         dev_err(di->dev, "AC charger not connected\n");
1380                         return -ENXIO;
1381                 }
1382
1383                 /* Enable AC charging */
1384                 dev_dbg(di->dev, "Enable AC: %dmV %dmA\n", vset, iset);
1385
1386                 /*
1387                  * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1388                  * will be triggered everytime we enable the VDD ADC supply.
1389                  * This will turn off charging for a short while.
1390                  * It can be avoided by having the supply on when
1391                  * there is a charger enabled. Normally the VDD ADC supply
1392                  * is enabled everytime a GPADC conversion is triggered. We will
1393                  * force it to be enabled from this driver to have
1394                  * the GPADC module independant of the AB8500 chargers
1395                  */
1396                 if (!di->vddadc_en_ac) {
1397                         regulator_enable(di->regu);
1398                         di->vddadc_en_ac = true;
1399                 }
1400
1401                 /* Check if the requested voltage or current is valid */
1402                 volt_index = ab8500_voltage_to_regval(vset);
1403                 curr_index = ab8500_current_to_regval(iset);
1404                 input_curr_index = ab8500_current_to_regval(
1405                         di->bm->chg_params->ac_curr_max);
1406                 if (volt_index < 0 || curr_index < 0 || input_curr_index < 0) {
1407                         dev_err(di->dev,
1408                                 "Charger voltage or current too high, "
1409                                 "charging not started\n");
1410                         return -ENXIO;
1411                 }
1412
1413                 /* ChVoltLevel: maximum battery charging voltage */
1414                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1415                         AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1416                 if (ret) {
1417                         dev_err(di->dev, "%s write failed\n", __func__);
1418                         return ret;
1419                 }
1420                 /* MainChInputCurr: current that can be drawn from the charger*/
1421                 ret = ab8500_charger_set_main_in_curr(di,
1422                         di->bm->chg_params->ac_curr_max);
1423                 if (ret) {
1424                         dev_err(di->dev, "%s Failed to set MainChInputCurr\n",
1425                                 __func__);
1426                         return ret;
1427                 }
1428                 /* ChOutputCurentLevel: protected output current */
1429                 ret = ab8500_charger_set_output_curr(di, iset);
1430                 if (ret) {
1431                         dev_err(di->dev, "%s "
1432                                 "Failed to set ChOutputCurentLevel\n",
1433                                 __func__);
1434                         return ret;
1435                 }
1436
1437                 /* Check if VBAT overshoot control should be enabled */
1438                 if (!di->bm->enable_overshoot)
1439                         overshoot = MAIN_CH_NO_OVERSHOOT_ENA_N;
1440
1441                 /* Enable Main Charger */
1442                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1443                         AB8500_MCH_CTRL1, MAIN_CH_ENA | overshoot);
1444                 if (ret) {
1445                         dev_err(di->dev, "%s write failed\n", __func__);
1446                         return ret;
1447                 }
1448
1449                 /* Power on charging LED indication */
1450                 ret = ab8500_charger_led_en(di, true);
1451                 if (ret < 0)
1452                         dev_err(di->dev, "failed to enable LED\n");
1453
1454                 di->ac.charger_online = 1;
1455         } else {
1456                 /* Disable AC charging */
1457                 if (is_ab8500_1p1_or_earlier(di->parent)) {
1458                         /*
1459                          * For ABB revision 1.0 and 1.1 there is a bug in the
1460                          * watchdog logic. That means we have to continously
1461                          * kick the charger watchdog even when no charger is
1462                          * connected. This is only valid once the AC charger
1463                          * has been enabled. This is a bug that is not handled
1464                          * by the algorithm and the watchdog have to be kicked
1465                          * by the charger driver when the AC charger
1466                          * is disabled
1467                          */
1468                         if (di->ac_conn) {
1469                                 queue_delayed_work(di->charger_wq,
1470                                         &di->kick_wd_work,
1471                                         round_jiffies(WD_KICK_INTERVAL));
1472                         }
1473
1474                         /*
1475                          * We can't turn off charging completely
1476                          * due to a bug in AB8500 cut1.
1477                          * If we do, charging will not start again.
1478                          * That is why we set the lowest voltage
1479                          * and current possible
1480                          */
1481                         ret = abx500_set_register_interruptible(di->dev,
1482                                 AB8500_CHARGER,
1483                                 AB8500_CH_VOLT_LVL_REG, CH_VOL_LVL_3P5);
1484                         if (ret) {
1485                                 dev_err(di->dev,
1486                                         "%s write failed\n", __func__);
1487                                 return ret;
1488                         }
1489
1490                         ret = ab8500_charger_set_output_curr(di, 0);
1491                         if (ret) {
1492                                 dev_err(di->dev, "%s "
1493                                         "Failed to set ChOutputCurentLevel\n",
1494                                         __func__);
1495                                 return ret;
1496                         }
1497                 } else {
1498                         ret = abx500_set_register_interruptible(di->dev,
1499                                 AB8500_CHARGER,
1500                                 AB8500_MCH_CTRL1, 0);
1501                         if (ret) {
1502                                 dev_err(di->dev,
1503                                         "%s write failed\n", __func__);
1504                                 return ret;
1505                         }
1506                 }
1507
1508                 ret = ab8500_charger_led_en(di, false);
1509                 if (ret < 0)
1510                         dev_err(di->dev, "failed to disable LED\n");
1511
1512                 di->ac.charger_online = 0;
1513                 di->ac.wd_expired = false;
1514
1515                 /* Disable regulator if enabled */
1516                 if (di->vddadc_en_ac) {
1517                         regulator_disable(di->regu);
1518                         di->vddadc_en_ac = false;
1519                 }
1520
1521                 dev_dbg(di->dev, "%s Disabled AC charging\n", __func__);
1522         }
1523         ab8500_power_supply_changed(di, &di->ac_chg.psy);
1524
1525         return ret;
1526 }
1527
1528 /**
1529  * ab8500_charger_usb_en() - enable usb charging
1530  * @di:         pointer to the ab8500_charger structure
1531  * @enable:     enable/disable flag
1532  * @vset:       charging voltage
1533  * @ich_out:    charger output current
1534  *
1535  * Enable/Disable USB charging and turns on/off the charging led respectively.
1536  * Returns error code in case of failure else 0(on success)
1537  */
1538 static int ab8500_charger_usb_en(struct ux500_charger *charger,
1539         int enable, int vset, int ich_out)
1540 {
1541         int ret;
1542         int volt_index;
1543         int curr_index;
1544         u8 overshoot = 0;
1545
1546         struct ab8500_charger *di = to_ab8500_charger_usb_device_info(charger);
1547
1548         if (enable) {
1549                 /* Check if USB is connected */
1550                 if (!di->usb.charger_connected) {
1551                         dev_err(di->dev, "USB charger not connected\n");
1552                         return -ENXIO;
1553                 }
1554
1555                 /*
1556                  * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1557                  * will be triggered everytime we enable the VDD ADC supply.
1558                  * This will turn off charging for a short while.
1559                  * It can be avoided by having the supply on when
1560                  * there is a charger enabled. Normally the VDD ADC supply
1561                  * is enabled everytime a GPADC conversion is triggered. We will
1562                  * force it to be enabled from this driver to have
1563                  * the GPADC module independant of the AB8500 chargers
1564                  */
1565                 if (!di->vddadc_en_usb) {
1566                         regulator_enable(di->regu);
1567                         di->vddadc_en_usb = true;
1568                 }
1569
1570                 /* Enable USB charging */
1571                 dev_dbg(di->dev, "Enable USB: %dmV %dmA\n", vset, ich_out);
1572
1573                 /* Check if the requested voltage or current is valid */
1574                 volt_index = ab8500_voltage_to_regval(vset);
1575                 curr_index = ab8500_current_to_regval(ich_out);
1576                 if (volt_index < 0 || curr_index < 0) {
1577                         dev_err(di->dev,
1578                                 "Charger voltage or current too high, "
1579                                 "charging not started\n");
1580                         return -ENXIO;
1581                 }
1582
1583                 /* ChVoltLevel: max voltage upto which battery can be charged */
1584                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1585                         AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1586                 if (ret) {
1587                         dev_err(di->dev, "%s write failed\n", __func__);
1588                         return ret;
1589                 }
1590                 /* Check if VBAT overshoot control should be enabled */
1591                 if (!di->bm->enable_overshoot)
1592                         overshoot = USB_CHG_NO_OVERSHOOT_ENA_N;
1593
1594                 /* Enable USB Charger */
1595                 dev_dbg(di->dev,
1596                         "Enabling USB with write to AB8500_USBCH_CTRL1_REG\n");
1597                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1598                         AB8500_USBCH_CTRL1_REG, USB_CH_ENA | overshoot);
1599                 if (ret) {
1600                         dev_err(di->dev, "%s write failed\n", __func__);
1601                         return ret;
1602                 }
1603
1604                 /* If success power on charging LED indication */
1605                 ret = ab8500_charger_led_en(di, true);
1606                 if (ret < 0)
1607                         dev_err(di->dev, "failed to enable LED\n");
1608
1609                 di->usb.charger_online = 1;
1610
1611                 /* USBChInputCurr: current that can be drawn from the usb */
1612                 ret = ab8500_charger_set_vbus_in_curr(di, di->max_usb_in_curr);
1613                 if (ret) {
1614                         dev_err(di->dev, "setting USBChInputCurr failed\n");
1615                         return ret;
1616                 }
1617
1618                 /* ChOutputCurentLevel: protected output current */
1619                 ret = ab8500_charger_set_output_curr(di, ich_out);
1620                 if (ret) {
1621                         dev_err(di->dev, "%s "
1622                                 "Failed to set ChOutputCurentLevel\n",
1623                                 __func__);
1624                         return ret;
1625                 }
1626
1627                 queue_delayed_work(di->charger_wq, &di->check_vbat_work, HZ);
1628
1629         } else {
1630                 /* Disable USB charging */
1631                 dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
1632                 ret = abx500_set_register_interruptible(di->dev,
1633                         AB8500_CHARGER,
1634                         AB8500_USBCH_CTRL1_REG, 0);
1635                 if (ret) {
1636                         dev_err(di->dev,
1637                                 "%s write failed\n", __func__);
1638                         return ret;
1639                 }
1640
1641                 ret = ab8500_charger_led_en(di, false);
1642                 if (ret < 0)
1643                         dev_err(di->dev, "failed to disable LED\n");
1644                 /* USBChInputCurr: current that can be drawn from the usb */
1645                 ret = ab8500_charger_set_vbus_in_curr(di, 0);
1646                 if (ret) {
1647                         dev_err(di->dev, "setting USBChInputCurr failed\n");
1648                         return ret;
1649                 }
1650
1651                 /* ChOutputCurentLevel: protected output current */
1652                 ret = ab8500_charger_set_output_curr(di, 0);
1653                 if (ret) {
1654                         dev_err(di->dev, "%s "
1655                                 "Failed to reset ChOutputCurentLevel\n",
1656                                 __func__);
1657                         return ret;
1658                 }
1659                 di->usb.charger_online = 0;
1660                 di->usb.wd_expired = false;
1661
1662                 /* Disable regulator if enabled */
1663                 if (di->vddadc_en_usb) {
1664                         regulator_disable(di->regu);
1665                         di->vddadc_en_usb = false;
1666                 }
1667
1668                 dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
1669
1670                 /* Cancel any pending Vbat check work */
1671                 if (delayed_work_pending(&di->check_vbat_work))
1672                         cancel_delayed_work(&di->check_vbat_work);
1673
1674         }
1675         ab8500_power_supply_changed(di, &di->usb_chg.psy);
1676
1677         return ret;
1678 }
1679
1680 /**
1681  * ab8500_charger_watchdog_kick() - kick charger watchdog
1682  * @di:         pointer to the ab8500_charger structure
1683  *
1684  * Kick charger watchdog
1685  * Returns error code in case of failure else 0(on success)
1686  */
1687 static int ab8500_charger_watchdog_kick(struct ux500_charger *charger)
1688 {
1689         int ret;
1690         struct ab8500_charger *di;
1691
1692         if (charger->psy.type == POWER_SUPPLY_TYPE_MAINS)
1693                 di = to_ab8500_charger_ac_device_info(charger);
1694         else if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
1695                 di = to_ab8500_charger_usb_device_info(charger);
1696         else
1697                 return -ENXIO;
1698
1699         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1700                 AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
1701         if (ret)
1702                 dev_err(di->dev, "Failed to kick WD!\n");
1703
1704         return ret;
1705 }
1706
1707 /**
1708  * ab8500_charger_update_charger_current() - update charger current
1709  * @di:         pointer to the ab8500_charger structure
1710  *
1711  * Update the charger output current for the specified charger
1712  * Returns error code in case of failure else 0(on success)
1713  */
1714 static int ab8500_charger_update_charger_current(struct ux500_charger *charger,
1715                 int ich_out)
1716 {
1717         int ret;
1718         struct ab8500_charger *di;
1719
1720         if (charger->psy.type == POWER_SUPPLY_TYPE_MAINS)
1721                 di = to_ab8500_charger_ac_device_info(charger);
1722         else if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
1723                 di = to_ab8500_charger_usb_device_info(charger);
1724         else
1725                 return -ENXIO;
1726
1727         ret = ab8500_charger_set_output_curr(di, ich_out);
1728         if (ret) {
1729                 dev_err(di->dev, "%s "
1730                         "Failed to set ChOutputCurentLevel\n",
1731                         __func__);
1732                 return ret;
1733         }
1734
1735         /* Reset the main and usb drop input current measurement counter */
1736         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1737                                 AB8500_CHARGER_CTRL,
1738                                 0x1);
1739         if (ret) {
1740                 dev_err(di->dev, "%s write failed\n", __func__);
1741                 return ret;
1742         }
1743
1744         return ret;
1745 }
1746
1747 static int ab8500_charger_get_ext_psy_data(struct device *dev, void *data)
1748 {
1749         struct power_supply *psy;
1750         struct power_supply *ext;
1751         struct ab8500_charger *di;
1752         union power_supply_propval ret;
1753         int i, j;
1754         bool psy_found = false;
1755         struct ux500_charger *usb_chg;
1756
1757         usb_chg = (struct ux500_charger *)data;
1758         psy = &usb_chg->psy;
1759
1760         di = to_ab8500_charger_usb_device_info(usb_chg);
1761
1762         ext = dev_get_drvdata(dev);
1763
1764         /* For all psy where the driver name appears in any supplied_to */
1765         for (i = 0; i < ext->num_supplicants; i++) {
1766                 if (!strcmp(ext->supplied_to[i], psy->name))
1767                         psy_found = true;
1768         }
1769
1770         if (!psy_found)
1771                 return 0;
1772
1773         /* Go through all properties for the psy */
1774         for (j = 0; j < ext->num_properties; j++) {
1775                 enum power_supply_property prop;
1776                 prop = ext->properties[j];
1777
1778                 if (ext->get_property(ext, prop, &ret))
1779                         continue;
1780
1781                 switch (prop) {
1782                 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1783                         switch (ext->type) {
1784                         case POWER_SUPPLY_TYPE_BATTERY:
1785                                 di->vbat = ret.intval / 1000;
1786                                 break;
1787                         default:
1788                                 break;
1789                         }
1790                         break;
1791                 default:
1792                         break;
1793                 }
1794         }
1795         return 0;
1796 }
1797
1798 /**
1799  * ab8500_charger_check_vbat_work() - keep vbus current within spec
1800  * @work        pointer to the work_struct structure
1801  *
1802  * Due to a asic bug it is necessary to lower the input current to the vbus
1803  * charger when charging with at some specific levels. This issue is only valid
1804  * for below a certain battery voltage. This function makes sure that the
1805  * the allowed current limit isn't exceeded.
1806  */
1807 static void ab8500_charger_check_vbat_work(struct work_struct *work)
1808 {
1809         int t = 10;
1810         struct ab8500_charger *di = container_of(work,
1811                 struct ab8500_charger, check_vbat_work.work);
1812
1813         class_for_each_device(power_supply_class, NULL,
1814                 &di->usb_chg.psy, ab8500_charger_get_ext_psy_data);
1815
1816         /* First run old_vbat is 0. */
1817         if (di->old_vbat == 0)
1818                 di->old_vbat = di->vbat;
1819
1820         if (!((di->old_vbat <= VBAT_TRESH_IP_CUR_RED &&
1821                 di->vbat <= VBAT_TRESH_IP_CUR_RED) ||
1822                 (di->old_vbat > VBAT_TRESH_IP_CUR_RED &&
1823                 di->vbat > VBAT_TRESH_IP_CUR_RED))) {
1824
1825                 dev_dbg(di->dev, "Vbat did cross threshold, curr: %d, new: %d,"
1826                         " old: %d\n", di->max_usb_in_curr, di->vbat,
1827                         di->old_vbat);
1828                 ab8500_charger_set_vbus_in_curr(di, di->max_usb_in_curr);
1829                 power_supply_changed(&di->usb_chg.psy);
1830         }
1831
1832         di->old_vbat = di->vbat;
1833
1834         /*
1835          * No need to check the battery voltage every second when not close to
1836          * the threshold.
1837          */
1838         if (di->vbat < (VBAT_TRESH_IP_CUR_RED + 100) &&
1839                 (di->vbat > (VBAT_TRESH_IP_CUR_RED - 100)))
1840                         t = 1;
1841
1842         queue_delayed_work(di->charger_wq, &di->check_vbat_work, t * HZ);
1843 }
1844
1845 /**
1846  * ab8500_charger_check_hw_failure_work() - check main charger failure
1847  * @work:       pointer to the work_struct structure
1848  *
1849  * Work queue function for checking the main charger status
1850  */
1851 static void ab8500_charger_check_hw_failure_work(struct work_struct *work)
1852 {
1853         int ret;
1854         u8 reg_value;
1855
1856         struct ab8500_charger *di = container_of(work,
1857                 struct ab8500_charger, check_hw_failure_work.work);
1858
1859         /* Check if the status bits for HW failure is still active */
1860         if (di->flags.mainextchnotok) {
1861                 ret = abx500_get_register_interruptible(di->dev,
1862                         AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
1863                 if (ret < 0) {
1864                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1865                         return;
1866                 }
1867                 if (!(reg_value & MAIN_CH_NOK)) {
1868                         di->flags.mainextchnotok = false;
1869                         ab8500_power_supply_changed(di, &di->ac_chg.psy);
1870                 }
1871         }
1872         if (di->flags.vbus_ovv) {
1873                 ret = abx500_get_register_interruptible(di->dev,
1874                         AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG,
1875                         &reg_value);
1876                 if (ret < 0) {
1877                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1878                         return;
1879                 }
1880                 if (!(reg_value & VBUS_OVV_TH)) {
1881                         di->flags.vbus_ovv = false;
1882                         ab8500_power_supply_changed(di, &di->usb_chg.psy);
1883                 }
1884         }
1885         /* If we still have a failure, schedule a new check */
1886         if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
1887                 queue_delayed_work(di->charger_wq,
1888                         &di->check_hw_failure_work, round_jiffies(HZ));
1889         }
1890 }
1891
1892 /**
1893  * ab8500_charger_kick_watchdog_work() - kick the watchdog
1894  * @work:       pointer to the work_struct structure
1895  *
1896  * Work queue function for kicking the charger watchdog.
1897  *
1898  * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
1899  * logic. That means we have to continously kick the charger
1900  * watchdog even when no charger is connected. This is only
1901  * valid once the AC charger has been enabled. This is
1902  * a bug that is not handled by the algorithm and the
1903  * watchdog have to be kicked by the charger driver
1904  * when the AC charger is disabled
1905  */
1906 static void ab8500_charger_kick_watchdog_work(struct work_struct *work)
1907 {
1908         int ret;
1909
1910         struct ab8500_charger *di = container_of(work,
1911                 struct ab8500_charger, kick_wd_work.work);
1912
1913         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1914                 AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
1915         if (ret)
1916                 dev_err(di->dev, "Failed to kick WD!\n");
1917
1918         /* Schedule a new watchdog kick */
1919         queue_delayed_work(di->charger_wq,
1920                 &di->kick_wd_work, round_jiffies(WD_KICK_INTERVAL));
1921 }
1922
1923 /**
1924  * ab8500_charger_ac_work() - work to get and set main charger status
1925  * @work:       pointer to the work_struct structure
1926  *
1927  * Work queue function for checking the main charger status
1928  */
1929 static void ab8500_charger_ac_work(struct work_struct *work)
1930 {
1931         int ret;
1932
1933         struct ab8500_charger *di = container_of(work,
1934                 struct ab8500_charger, ac_work);
1935
1936         /*
1937          * Since we can't be sure that the events are received
1938          * synchronously, we have the check if the main charger is
1939          * connected by reading the status register
1940          */
1941         ret = ab8500_charger_detect_chargers(di, false);
1942         if (ret < 0)
1943                 return;
1944
1945         if (ret & AC_PW_CONN) {
1946                 di->ac.charger_connected = 1;
1947                 di->ac_conn = true;
1948         } else {
1949                 di->ac.charger_connected = 0;
1950         }
1951
1952         ab8500_power_supply_changed(di, &di->ac_chg.psy);
1953         sysfs_notify(&di->ac_chg.psy.dev->kobj, NULL, "present");
1954 }
1955
1956 static void ab8500_charger_usb_attached_work(struct work_struct *work)
1957 {
1958         struct ab8500_charger *di = container_of(work,
1959                                                  struct ab8500_charger,
1960                                                  usb_charger_attached_work.work);
1961         int usbch = (USB_CH_VBUSDROP | USB_CH_VBUSDETDBNC);
1962         int ret, i;
1963         u8 statval;
1964
1965         for (i = 0; i < 10; i++) {
1966                 ret = abx500_get_register_interruptible(di->dev,
1967                                                         AB8500_CHARGER,
1968                                                         AB8500_CH_USBCH_STAT1_REG,
1969                                                         &statval);
1970                 if (ret < 0) {
1971                         dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
1972                         goto reschedule;
1973                 }
1974                 if ((statval & usbch) != usbch)
1975                         goto reschedule;
1976
1977                 msleep(CHARGER_STATUS_POLL);
1978         }
1979
1980         ab8500_charger_usb_en(&di->usb_chg, 0, 0, 0);
1981
1982         mutex_lock(&di->charger_attached_mutex);
1983         mutex_unlock(&di->charger_attached_mutex);
1984
1985         return;
1986
1987 reschedule:
1988         queue_delayed_work(di->charger_wq,
1989                            &di->usb_charger_attached_work,
1990                            HZ);
1991 }
1992
1993 static void ab8500_charger_ac_attached_work(struct work_struct *work)
1994 {
1995
1996         struct ab8500_charger *di = container_of(work,
1997                                                  struct ab8500_charger,
1998                                                  ac_charger_attached_work.work);
1999         int mainch = (MAIN_CH_STATUS2_MAINCHGDROP |
2000                       MAIN_CH_STATUS2_MAINCHARGERDETDBNC);
2001         int ret, i;
2002         u8 statval;
2003
2004         for (i = 0; i < 10; i++) {
2005                 ret = abx500_get_register_interruptible(di->dev,
2006                                                         AB8500_CHARGER,
2007                                                         AB8500_CH_STATUS2_REG,
2008                                                         &statval);
2009                 if (ret < 0) {
2010                         dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
2011                         goto reschedule;
2012                 }
2013
2014                 if ((statval & mainch) != mainch)
2015                         goto reschedule;
2016
2017                 msleep(CHARGER_STATUS_POLL);
2018         }
2019
2020         ab8500_charger_ac_en(&di->ac_chg, 0, 0, 0);
2021         queue_work(di->charger_wq, &di->ac_work);
2022
2023         mutex_lock(&di->charger_attached_mutex);
2024         mutex_unlock(&di->charger_attached_mutex);
2025
2026         return;
2027
2028 reschedule:
2029         queue_delayed_work(di->charger_wq,
2030                            &di->ac_charger_attached_work,
2031                            HZ);
2032 }
2033
2034 /**
2035  * ab8500_charger_detect_usb_type_work() - work to detect USB type
2036  * @work:       Pointer to the work_struct structure
2037  *
2038  * Detect the type of USB plugged
2039  */
2040 static void ab8500_charger_detect_usb_type_work(struct work_struct *work)
2041 {
2042         int ret;
2043
2044         struct ab8500_charger *di = container_of(work,
2045                 struct ab8500_charger, detect_usb_type_work);
2046
2047         /*
2048          * Since we can't be sure that the events are received
2049          * synchronously, we have the check if is
2050          * connected by reading the status register
2051          */
2052         ret = ab8500_charger_detect_chargers(di, false);
2053         if (ret < 0)
2054                 return;
2055
2056         if (!(ret & USB_PW_CONN)) {
2057                 dev_dbg(di->dev, "%s di->vbus_detected = false\n", __func__);
2058                 di->vbus_detected = false;
2059                 ab8500_charger_set_usb_connected(di, false);
2060                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2061         } else {
2062                 dev_dbg(di->dev, "%s di->vbus_detected = true\n", __func__);
2063                 di->vbus_detected = true;
2064
2065                 if (is_ab8500_1p1_or_earlier(di->parent)) {
2066                         ret = ab8500_charger_detect_usb_type(di);
2067                         if (!ret) {
2068                                 ab8500_charger_set_usb_connected(di, true);
2069                                 ab8500_power_supply_changed(di,
2070                                                             &di->usb_chg.psy);
2071                         }
2072                 } else {
2073                         /*
2074                          * For ABB cut2.0 and onwards we have an IRQ,
2075                          * USB_LINK_STATUS that will be triggered when the USB
2076                          * link status changes. The exception is USB connected
2077                          * during startup. Then we don't get a
2078                          * USB_LINK_STATUS IRQ
2079                          */
2080                         if (di->vbus_detected_start) {
2081                                 di->vbus_detected_start = false;
2082                                 ret = ab8500_charger_detect_usb_type(di);
2083                                 if (!ret) {
2084                                         ab8500_charger_set_usb_connected(di,
2085                                                 true);
2086                                         ab8500_power_supply_changed(di,
2087                                                 &di->usb_chg.psy);
2088                                 }
2089                         }
2090                 }
2091         }
2092 }
2093
2094 /**
2095  * ab8500_charger_usb_link_attach_work() - work to detect USB type
2096  * @work:       pointer to the work_struct structure
2097  *
2098  * Detect the type of USB plugged
2099  */
2100 static void ab8500_charger_usb_link_attach_work(struct work_struct *work)
2101 {
2102         struct ab8500_charger *di =
2103                 container_of(work, struct ab8500_charger, attach_work.work);
2104         int ret;
2105
2106         /* Update maximum input current if USB enumeration is not detected */
2107         if (!di->usb.charger_online) {
2108                 ret = ab8500_charger_set_vbus_in_curr(di, di->max_usb_in_curr);
2109                 if (ret)
2110                         return;
2111         }
2112
2113         ab8500_charger_set_usb_connected(di, true);
2114         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2115 }
2116
2117 /**
2118  * ab8500_charger_usb_link_status_work() - work to detect USB type
2119  * @work:       pointer to the work_struct structure
2120  *
2121  * Detect the type of USB plugged
2122  */
2123 static void ab8500_charger_usb_link_status_work(struct work_struct *work)
2124 {
2125         int detected_chargers;
2126         int ret;
2127         u8 val;
2128
2129         struct ab8500_charger *di = container_of(work,
2130                 struct ab8500_charger, usb_link_status_work);
2131
2132         /*
2133          * Since we can't be sure that the events are received
2134          * synchronously, we have the check if  is
2135          * connected by reading the status register
2136          */
2137         detected_chargers = ab8500_charger_detect_chargers(di, false);
2138         if (detected_chargers < 0)
2139                 return;
2140
2141         /*
2142          * Some chargers that breaks the USB spec is
2143          * identified as invalid by AB8500 and it refuse
2144          * to start the charging process. but by jumping
2145          * thru a few hoops it can be forced to start.
2146          */
2147         ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
2148                         AB8500_USB_LINE_STAT_REG, &val);
2149         if (ret >= 0)
2150                 dev_dbg(di->dev, "UsbLineStatus register = 0x%02x\n", val);
2151         else
2152                 dev_dbg(di->dev, "Error reading USB link status\n");
2153
2154         if (detected_chargers & USB_PW_CONN) {
2155                 if (((val & AB8500_USB_LINK_STATUS) >> 3) == USB_STAT_NOT_VALID_LINK &&
2156                                 di->invalid_charger_detect_state == 0) {
2157                         dev_dbg(di->dev, "Invalid charger detected, state= 0\n");
2158                         /*Enable charger*/
2159                         abx500_mask_and_set_register_interruptible(di->dev,
2160                                         AB8500_CHARGER, AB8500_USBCH_CTRL1_REG, 0x01, 0x01);
2161                         /*Enable charger detection*/
2162                         abx500_mask_and_set_register_interruptible(di->dev, AB8500_USB,
2163                                         AB8500_MCH_IPT_CURLVL_REG, 0x01, 0x01);
2164                         di->invalid_charger_detect_state = 1;
2165                         /*exit and wait for new link status interrupt.*/
2166                         return;
2167
2168                 }
2169                 if (di->invalid_charger_detect_state == 1) {
2170                         dev_dbg(di->dev, "Invalid charger detected, state= 1\n");
2171                         /*Stop charger detection*/
2172                         abx500_mask_and_set_register_interruptible(di->dev, AB8500_USB,
2173                                         AB8500_MCH_IPT_CURLVL_REG, 0x01, 0x00);
2174                         /*Check link status*/
2175                         ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
2176                                         AB8500_USB_LINE_STAT_REG, &val);
2177                         dev_dbg(di->dev, "USB link status= 0x%02x\n",
2178                                         (val & AB8500_USB_LINK_STATUS) >> 3);
2179                         di->invalid_charger_detect_state = 2;
2180                 }
2181         } else {
2182                 di->invalid_charger_detect_state = 0;
2183         }
2184
2185         if (!(detected_chargers & USB_PW_CONN)) {
2186                 di->vbus_detected = false;
2187                 ab8500_charger_set_usb_connected(di, false);
2188                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2189                 return;
2190         }
2191
2192         dev_dbg(di->dev,"%s di->vbus_detected = true\n",__func__);
2193         di->vbus_detected = true;
2194         ret = ab8500_charger_read_usb_type(di);
2195         if (ret) {
2196                 if (ret == -ENXIO) {
2197                         /* No valid charger type detected */
2198                         ab8500_charger_set_usb_connected(di, false);
2199                         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2200                 }
2201                 return;
2202         }
2203
2204         if (di->usb_device_is_unrecognised) {
2205                 dev_dbg(di->dev,
2206                         "Potential Legacy Charger device. "
2207                         "Delay work for %d msec for USB enum "
2208                         "to finish",
2209                         WAIT_ACA_RID_ENUMERATION);
2210                 queue_delayed_work(di->charger_wq,
2211                                    &di->attach_work,
2212                                    msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
2213         } else if (di->is_aca_rid == 1) {
2214                 /* Only wait once */
2215                 di->is_aca_rid++;
2216                 dev_dbg(di->dev,
2217                         "%s Wait %d msec for USB enum to finish",
2218                         __func__, WAIT_ACA_RID_ENUMERATION);
2219                 queue_delayed_work(di->charger_wq,
2220                                    &di->attach_work,
2221                                    msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
2222         } else {
2223                 queue_delayed_work(di->charger_wq,
2224                                    &di->attach_work,
2225                                    0);
2226         }
2227 }
2228
2229 static void ab8500_charger_usb_state_changed_work(struct work_struct *work)
2230 {
2231         int ret;
2232         unsigned long flags;
2233
2234         struct ab8500_charger *di = container_of(work,
2235                 struct ab8500_charger, usb_state_changed_work.work);
2236
2237         if (!di->vbus_detected) {
2238                 dev_dbg(di->dev,
2239                         "%s !di->vbus_detected\n",
2240                         __func__);
2241                 return;
2242         }
2243
2244         spin_lock_irqsave(&di->usb_state.usb_lock, flags);
2245         di->usb_state.state = di->usb_state.state_tmp;
2246         di->usb_state.usb_current = di->usb_state.usb_current_tmp;
2247         spin_unlock_irqrestore(&di->usb_state.usb_lock, flags);
2248
2249         dev_dbg(di->dev, "%s USB state: 0x%02x mA: %d\n",
2250                 __func__, di->usb_state.state, di->usb_state.usb_current);
2251
2252         switch (di->usb_state.state) {
2253         case AB8500_BM_USB_STATE_RESET_HS:
2254         case AB8500_BM_USB_STATE_RESET_FS:
2255         case AB8500_BM_USB_STATE_SUSPEND:
2256         case AB8500_BM_USB_STATE_MAX:
2257                 ab8500_charger_set_usb_connected(di, false);
2258                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2259                 break;
2260
2261         case AB8500_BM_USB_STATE_RESUME:
2262                 /*
2263                  * when suspend->resume there should be delay
2264                  * of 1sec for enabling charging
2265                  */
2266                 msleep(1000);
2267                 /* Intentional fall through */
2268         case AB8500_BM_USB_STATE_CONFIGURED:
2269                 /*
2270                  * USB is configured, enable charging with the charging
2271                  * input current obtained from USB driver
2272                  */
2273                 if (!ab8500_charger_get_usb_cur(di)) {
2274                         /* Update maximum input current */
2275                         ret = ab8500_charger_set_vbus_in_curr(di,
2276                                         di->max_usb_in_curr);
2277                         if (ret)
2278                                 return;
2279
2280                         ab8500_charger_set_usb_connected(di, true);
2281                         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2282                 }
2283                 break;
2284
2285         default:
2286                 break;
2287         };
2288 }
2289
2290 /**
2291  * ab8500_charger_check_usbchargernotok_work() - check USB chg not ok status
2292  * @work:       pointer to the work_struct structure
2293  *
2294  * Work queue function for checking the USB charger Not OK status
2295  */
2296 static void ab8500_charger_check_usbchargernotok_work(struct work_struct *work)
2297 {
2298         int ret;
2299         u8 reg_value;
2300         bool prev_status;
2301
2302         struct ab8500_charger *di = container_of(work,
2303                 struct ab8500_charger, check_usbchgnotok_work.work);
2304
2305         /* Check if the status bit for usbchargernotok is still active */
2306         ret = abx500_get_register_interruptible(di->dev,
2307                 AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
2308         if (ret < 0) {
2309                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2310                 return;
2311         }
2312         prev_status = di->flags.usbchargernotok;
2313
2314         if (reg_value & VBUS_CH_NOK) {
2315                 di->flags.usbchargernotok = true;
2316                 /* Check again in 1sec */
2317                 queue_delayed_work(di->charger_wq,
2318                         &di->check_usbchgnotok_work, HZ);
2319         } else {
2320                 di->flags.usbchargernotok = false;
2321                 di->flags.vbus_collapse = false;
2322         }
2323
2324         if (prev_status != di->flags.usbchargernotok)
2325                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2326 }
2327
2328 /**
2329  * ab8500_charger_check_main_thermal_prot_work() - check main thermal status
2330  * @work:       pointer to the work_struct structure
2331  *
2332  * Work queue function for checking the Main thermal prot status
2333  */
2334 static void ab8500_charger_check_main_thermal_prot_work(
2335         struct work_struct *work)
2336 {
2337         int ret;
2338         u8 reg_value;
2339
2340         struct ab8500_charger *di = container_of(work,
2341                 struct ab8500_charger, check_main_thermal_prot_work);
2342
2343         /* Check if the status bit for main_thermal_prot is still active */
2344         ret = abx500_get_register_interruptible(di->dev,
2345                 AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
2346         if (ret < 0) {
2347                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2348                 return;
2349         }
2350         if (reg_value & MAIN_CH_TH_PROT)
2351                 di->flags.main_thermal_prot = true;
2352         else
2353                 di->flags.main_thermal_prot = false;
2354
2355         ab8500_power_supply_changed(di, &di->ac_chg.psy);
2356 }
2357
2358 /**
2359  * ab8500_charger_check_usb_thermal_prot_work() - check usb thermal status
2360  * @work:       pointer to the work_struct structure
2361  *
2362  * Work queue function for checking the USB thermal prot status
2363  */
2364 static void ab8500_charger_check_usb_thermal_prot_work(
2365         struct work_struct *work)
2366 {
2367         int ret;
2368         u8 reg_value;
2369
2370         struct ab8500_charger *di = container_of(work,
2371                 struct ab8500_charger, check_usb_thermal_prot_work);
2372
2373         /* Check if the status bit for usb_thermal_prot is still active */
2374         ret = abx500_get_register_interruptible(di->dev,
2375                 AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
2376         if (ret < 0) {
2377                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2378                 return;
2379         }
2380         if (reg_value & USB_CH_TH_PROT)
2381                 di->flags.usb_thermal_prot = true;
2382         else
2383                 di->flags.usb_thermal_prot = false;
2384
2385         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2386 }
2387
2388 /**
2389  * ab8500_charger_mainchunplugdet_handler() - main charger unplugged
2390  * @irq:       interrupt number
2391  * @_di:       pointer to the ab8500_charger structure
2392  *
2393  * Returns IRQ status(IRQ_HANDLED)
2394  */
2395 static irqreturn_t ab8500_charger_mainchunplugdet_handler(int irq, void *_di)
2396 {
2397         struct ab8500_charger *di = _di;
2398
2399         dev_dbg(di->dev, "Main charger unplugged\n");
2400         queue_work(di->charger_wq, &di->ac_work);
2401
2402         cancel_delayed_work_sync(&di->ac_charger_attached_work);
2403         mutex_lock(&di->charger_attached_mutex);
2404         mutex_unlock(&di->charger_attached_mutex);
2405
2406         return IRQ_HANDLED;
2407 }
2408
2409 /**
2410  * ab8500_charger_mainchplugdet_handler() - main charger plugged
2411  * @irq:       interrupt number
2412  * @_di:       pointer to the ab8500_charger structure
2413  *
2414  * Returns IRQ status(IRQ_HANDLED)
2415  */
2416 static irqreturn_t ab8500_charger_mainchplugdet_handler(int irq, void *_di)
2417 {
2418         struct ab8500_charger *di = _di;
2419
2420         dev_dbg(di->dev, "Main charger plugged\n");
2421         queue_work(di->charger_wq, &di->ac_work);
2422
2423         mutex_lock(&di->charger_attached_mutex);
2424         mutex_unlock(&di->charger_attached_mutex);
2425         queue_delayed_work(di->charger_wq,
2426                            &di->ac_charger_attached_work,
2427                            HZ);
2428         return IRQ_HANDLED;
2429 }
2430
2431 /**
2432  * ab8500_charger_mainextchnotok_handler() - main charger not ok
2433  * @irq:       interrupt number
2434  * @_di:       pointer to the ab8500_charger structure
2435  *
2436  * Returns IRQ status(IRQ_HANDLED)
2437  */
2438 static irqreturn_t ab8500_charger_mainextchnotok_handler(int irq, void *_di)
2439 {
2440         struct ab8500_charger *di = _di;
2441
2442         dev_dbg(di->dev, "Main charger not ok\n");
2443         di->flags.mainextchnotok = true;
2444         ab8500_power_supply_changed(di, &di->ac_chg.psy);
2445
2446         /* Schedule a new HW failure check */
2447         queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2448
2449         return IRQ_HANDLED;
2450 }
2451
2452 /**
2453  * ab8500_charger_mainchthprotr_handler() - Die temp is above main charger
2454  * thermal protection threshold
2455  * @irq:       interrupt number
2456  * @_di:       pointer to the ab8500_charger structure
2457  *
2458  * Returns IRQ status(IRQ_HANDLED)
2459  */
2460 static irqreturn_t ab8500_charger_mainchthprotr_handler(int irq, void *_di)
2461 {
2462         struct ab8500_charger *di = _di;
2463
2464         dev_dbg(di->dev,
2465                 "Die temp above Main charger thermal protection threshold\n");
2466         queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2467
2468         return IRQ_HANDLED;
2469 }
2470
2471 /**
2472  * ab8500_charger_mainchthprotf_handler() - Die temp is below main charger
2473  * thermal protection threshold
2474  * @irq:       interrupt number
2475  * @_di:       pointer to the ab8500_charger structure
2476  *
2477  * Returns IRQ status(IRQ_HANDLED)
2478  */
2479 static irqreturn_t ab8500_charger_mainchthprotf_handler(int irq, void *_di)
2480 {
2481         struct ab8500_charger *di = _di;
2482
2483         dev_dbg(di->dev,
2484                 "Die temp ok for Main charger thermal protection threshold\n");
2485         queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2486
2487         return IRQ_HANDLED;
2488 }
2489
2490 static void ab8500_charger_vbus_drop_end_work(struct work_struct *work)
2491 {
2492         struct ab8500_charger *di = container_of(work,
2493                 struct ab8500_charger, vbus_drop_end_work.work);
2494
2495         di->flags.vbus_drop_end = false;
2496
2497         /* Reset the drop counter */
2498         abx500_set_register_interruptible(di->dev,
2499                                   AB8500_CHARGER, AB8500_CHARGER_CTRL, 0x01);
2500
2501         if (di->usb.charger_connected)
2502                 ab8500_charger_set_vbus_in_curr(di, di->max_usb_in_curr);
2503 }
2504
2505 /**
2506  * ab8500_charger_vbusdetf_handler() - VBUS falling detected
2507  * @irq:       interrupt number
2508  * @_di:       pointer to the ab8500_charger structure
2509  *
2510  * Returns IRQ status(IRQ_HANDLED)
2511  */
2512 static irqreturn_t ab8500_charger_vbusdetf_handler(int irq, void *_di)
2513 {
2514         struct ab8500_charger *di = _di;
2515
2516         di->vbus_detected = false;
2517         dev_dbg(di->dev, "VBUS falling detected\n");
2518         queue_work(di->charger_wq, &di->detect_usb_type_work);
2519
2520         return IRQ_HANDLED;
2521 }
2522
2523 /**
2524  * ab8500_charger_vbusdetr_handler() - VBUS rising detected
2525  * @irq:       interrupt number
2526  * @_di:       pointer to the ab8500_charger structure
2527  *
2528  * Returns IRQ status(IRQ_HANDLED)
2529  */
2530 static irqreturn_t ab8500_charger_vbusdetr_handler(int irq, void *_di)
2531 {
2532         struct ab8500_charger *di = _di;
2533
2534         di->vbus_detected = true;
2535         dev_dbg(di->dev, "VBUS rising detected\n");
2536
2537         queue_work(di->charger_wq, &di->detect_usb_type_work);
2538
2539         return IRQ_HANDLED;
2540 }
2541
2542 /**
2543  * ab8500_charger_usblinkstatus_handler() - USB link status has changed
2544  * @irq:       interrupt number
2545  * @_di:       pointer to the ab8500_charger structure
2546  *
2547  * Returns IRQ status(IRQ_HANDLED)
2548  */
2549 static irqreturn_t ab8500_charger_usblinkstatus_handler(int irq, void *_di)
2550 {
2551         struct ab8500_charger *di = _di;
2552
2553         dev_dbg(di->dev, "USB link status changed\n");
2554
2555         queue_work(di->charger_wq, &di->usb_link_status_work);
2556
2557         return IRQ_HANDLED;
2558 }
2559
2560 /**
2561  * ab8500_charger_usbchthprotr_handler() - Die temp is above usb charger
2562  * thermal protection threshold
2563  * @irq:       interrupt number
2564  * @_di:       pointer to the ab8500_charger structure
2565  *
2566  * Returns IRQ status(IRQ_HANDLED)
2567  */
2568 static irqreturn_t ab8500_charger_usbchthprotr_handler(int irq, void *_di)
2569 {
2570         struct ab8500_charger *di = _di;
2571
2572         dev_dbg(di->dev,
2573                 "Die temp above USB charger thermal protection threshold\n");
2574         queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2575
2576         return IRQ_HANDLED;
2577 }
2578
2579 /**
2580  * ab8500_charger_usbchthprotf_handler() - Die temp is below usb charger
2581  * thermal protection threshold
2582  * @irq:       interrupt number
2583  * @_di:       pointer to the ab8500_charger structure
2584  *
2585  * Returns IRQ status(IRQ_HANDLED)
2586  */
2587 static irqreturn_t ab8500_charger_usbchthprotf_handler(int irq, void *_di)
2588 {
2589         struct ab8500_charger *di = _di;
2590
2591         dev_dbg(di->dev,
2592                 "Die temp ok for USB charger thermal protection threshold\n");
2593         queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2594
2595         return IRQ_HANDLED;
2596 }
2597
2598 /**
2599  * ab8500_charger_usbchargernotokr_handler() - USB charger not ok detected
2600  * @irq:       interrupt number
2601  * @_di:       pointer to the ab8500_charger structure
2602  *
2603  * Returns IRQ status(IRQ_HANDLED)
2604  */
2605 static irqreturn_t ab8500_charger_usbchargernotokr_handler(int irq, void *_di)
2606 {
2607         struct ab8500_charger *di = _di;
2608
2609         dev_dbg(di->dev, "Not allowed USB charger detected\n");
2610         queue_delayed_work(di->charger_wq, &di->check_usbchgnotok_work, 0);
2611
2612         return IRQ_HANDLED;
2613 }
2614
2615 /**
2616  * ab8500_charger_chwdexp_handler() - Charger watchdog expired
2617  * @irq:       interrupt number
2618  * @_di:       pointer to the ab8500_charger structure
2619  *
2620  * Returns IRQ status(IRQ_HANDLED)
2621  */
2622 static irqreturn_t ab8500_charger_chwdexp_handler(int irq, void *_di)
2623 {
2624         struct ab8500_charger *di = _di;
2625
2626         dev_dbg(di->dev, "Charger watchdog expired\n");
2627
2628         /*
2629          * The charger that was online when the watchdog expired
2630          * needs to be restarted for charging to start again
2631          */
2632         if (di->ac.charger_online) {
2633                 di->ac.wd_expired = true;
2634                 ab8500_power_supply_changed(di, &di->ac_chg.psy);
2635         }
2636         if (di->usb.charger_online) {
2637                 di->usb.wd_expired = true;
2638                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2639         }
2640
2641         return IRQ_HANDLED;
2642 }
2643
2644 /**
2645  * ab8500_charger_vbuschdropend_handler() - VBUS drop removed
2646  * @irq:       interrupt number
2647  * @_di:       pointer to the ab8500_charger structure
2648  *
2649  * Returns IRQ status(IRQ_HANDLED)
2650  */
2651 static irqreturn_t ab8500_charger_vbuschdropend_handler(int irq, void *_di)
2652 {
2653         struct ab8500_charger *di = _di;
2654
2655         dev_dbg(di->dev, "VBUS charger drop ended\n");
2656         di->flags.vbus_drop_end = true;
2657         queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work,
2658                            round_jiffies(30 * HZ));
2659
2660         return IRQ_HANDLED;
2661 }
2662
2663 /**
2664  * ab8500_charger_vbusovv_handler() - VBUS overvoltage detected
2665  * @irq:       interrupt number
2666  * @_di:       pointer to the ab8500_charger structure
2667  *
2668  * Returns IRQ status(IRQ_HANDLED)
2669  */
2670 static irqreturn_t ab8500_charger_vbusovv_handler(int irq, void *_di)
2671 {
2672         struct ab8500_charger *di = _di;
2673
2674         dev_dbg(di->dev, "VBUS overvoltage detected\n");
2675         di->flags.vbus_ovv = true;
2676         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2677
2678         /* Schedule a new HW failure check */
2679         queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2680
2681         return IRQ_HANDLED;
2682 }
2683
2684 /**
2685  * ab8500_charger_ac_get_property() - get the ac/mains properties
2686  * @psy:       pointer to the power_supply structure
2687  * @psp:       pointer to the power_supply_property structure
2688  * @val:       pointer to the power_supply_propval union
2689  *
2690  * This function gets called when an application tries to get the ac/mains
2691  * properties by reading the sysfs files.
2692  * AC/Mains properties are online, present and voltage.
2693  * online:     ac/mains charging is in progress or not
2694  * present:    presence of the ac/mains
2695  * voltage:    AC/Mains voltage
2696  * Returns error code in case of failure else 0(on success)
2697  */
2698 static int ab8500_charger_ac_get_property(struct power_supply *psy,
2699         enum power_supply_property psp,
2700         union power_supply_propval *val)
2701 {
2702         struct ab8500_charger *di;
2703         int ret;
2704
2705         di = to_ab8500_charger_ac_device_info(psy_to_ux500_charger(psy));
2706
2707         switch (psp) {
2708         case POWER_SUPPLY_PROP_HEALTH:
2709                 if (di->flags.mainextchnotok)
2710                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
2711                 else if (di->ac.wd_expired || di->usb.wd_expired)
2712                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
2713                 else if (di->flags.main_thermal_prot)
2714                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
2715                 else
2716                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
2717                 break;
2718         case POWER_SUPPLY_PROP_ONLINE:
2719                 val->intval = di->ac.charger_online;
2720                 break;
2721         case POWER_SUPPLY_PROP_PRESENT:
2722                 val->intval = di->ac.charger_connected;
2723                 break;
2724         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2725                 ret = ab8500_charger_get_ac_voltage(di);
2726                 if (ret >= 0)
2727                         di->ac.charger_voltage = ret;
2728                 /* On error, use previous value */
2729                 val->intval = di->ac.charger_voltage * 1000;
2730                 break;
2731         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
2732                 /*
2733                  * This property is used to indicate when CV mode is entered
2734                  * for the AC charger
2735                  */
2736                 di->ac.cv_active = ab8500_charger_ac_cv(di);
2737                 val->intval = di->ac.cv_active;
2738                 break;
2739         case POWER_SUPPLY_PROP_CURRENT_NOW:
2740                 ret = ab8500_charger_get_ac_current(di);
2741                 if (ret >= 0)
2742                         di->ac.charger_current = ret;
2743                 val->intval = di->ac.charger_current * 1000;
2744                 break;
2745         default:
2746                 return -EINVAL;
2747         }
2748         return 0;
2749 }
2750
2751 /**
2752  * ab8500_charger_usb_get_property() - get the usb properties
2753  * @psy:        pointer to the power_supply structure
2754  * @psp:        pointer to the power_supply_property structure
2755  * @val:        pointer to the power_supply_propval union
2756  *
2757  * This function gets called when an application tries to get the usb
2758  * properties by reading the sysfs files.
2759  * USB properties are online, present and voltage.
2760  * online:     usb charging is in progress or not
2761  * present:    presence of the usb
2762  * voltage:    vbus voltage
2763  * Returns error code in case of failure else 0(on success)
2764  */
2765 static int ab8500_charger_usb_get_property(struct power_supply *psy,
2766         enum power_supply_property psp,
2767         union power_supply_propval *val)
2768 {
2769         struct ab8500_charger *di;
2770         int ret;
2771
2772         di = to_ab8500_charger_usb_device_info(psy_to_ux500_charger(psy));
2773
2774         switch (psp) {
2775         case POWER_SUPPLY_PROP_HEALTH:
2776                 if (di->flags.usbchargernotok)
2777                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
2778                 else if (di->ac.wd_expired || di->usb.wd_expired)
2779                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
2780                 else if (di->flags.usb_thermal_prot)
2781                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
2782                 else if (di->flags.vbus_ovv)
2783                         val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
2784                 else
2785                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
2786                 break;
2787         case POWER_SUPPLY_PROP_ONLINE:
2788                 val->intval = di->usb.charger_online;
2789                 break;
2790         case POWER_SUPPLY_PROP_PRESENT:
2791                 val->intval = di->usb.charger_connected;
2792                 break;
2793         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2794                 ret = ab8500_charger_get_vbus_voltage(di);
2795                 if (ret >= 0)
2796                         di->usb.charger_voltage = ret;
2797                 val->intval = di->usb.charger_voltage * 1000;
2798                 break;
2799         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
2800                 /*
2801                  * This property is used to indicate when CV mode is entered
2802                  * for the USB charger
2803                  */
2804                 di->usb.cv_active = ab8500_charger_usb_cv(di);
2805                 val->intval = di->usb.cv_active;
2806                 break;
2807         case POWER_SUPPLY_PROP_CURRENT_NOW:
2808                 ret = ab8500_charger_get_usb_current(di);
2809                 if (ret >= 0)
2810                         di->usb.charger_current = ret;
2811                 val->intval = di->usb.charger_current * 1000;
2812                 break;
2813         case POWER_SUPPLY_PROP_CURRENT_AVG:
2814                 /*
2815                  * This property is used to indicate when VBUS has collapsed
2816                  * due to too high output current from the USB charger
2817                  */
2818                 if (di->flags.vbus_collapse)
2819                         val->intval = 1;
2820                 else
2821                         val->intval = 0;
2822                 break;
2823         default:
2824                 return -EINVAL;
2825         }
2826         return 0;
2827 }
2828
2829 /**
2830  * ab8500_charger_init_hw_registers() - Set up charger related registers
2831  * @di:         pointer to the ab8500_charger structure
2832  *
2833  * Set up charger OVV, watchdog and maximum voltage registers as well as
2834  * charging of the backup battery
2835  */
2836 static int ab8500_charger_init_hw_registers(struct ab8500_charger *di)
2837 {
2838         int ret = 0;
2839
2840         /* Setup maximum charger current and voltage for ABB cut2.0 */
2841         if (!is_ab8500_1p1_or_earlier(di->parent)) {
2842                 ret = abx500_set_register_interruptible(di->dev,
2843                         AB8500_CHARGER,
2844                         AB8500_CH_VOLT_LVL_MAX_REG, CH_VOL_LVL_4P6);
2845                 if (ret) {
2846                         dev_err(di->dev,
2847                                 "failed to set CH_VOLT_LVL_MAX_REG\n");
2848                         goto out;
2849                 }
2850
2851                 ret = abx500_set_register_interruptible(di->dev,
2852                         AB8500_CHARGER,
2853                         AB8500_CH_OPT_CRNTLVL_MAX_REG, CH_OP_CUR_LVL_1P6);
2854                 if (ret) {
2855                         dev_err(di->dev,
2856                                 "failed to set CH_OPT_CRNTLVL_MAX_REG\n");
2857                         goto out;
2858                 }
2859         }
2860
2861         if (is_ab9540_2p0(di->parent) || is_ab8505_2p0(di->parent))
2862                 ret = abx500_mask_and_set_register_interruptible(di->dev,
2863                         AB8500_CHARGER,
2864                         AB8500_USBCH_CTRL2_REG,
2865                         VBUS_AUTO_IN_CURR_LIM_ENA,
2866                         VBUS_AUTO_IN_CURR_LIM_ENA);
2867         else
2868                 /*
2869                  * VBUS OVV set to 6.3V and enable automatic current limitation
2870                  */
2871                 ret = abx500_set_register_interruptible(di->dev,
2872                         AB8500_CHARGER,
2873                         AB8500_USBCH_CTRL2_REG,
2874                         VBUS_OVV_SELECT_6P3V | VBUS_AUTO_IN_CURR_LIM_ENA);
2875         if (ret) {
2876                 dev_err(di->dev,
2877                         "failed to set automatic current limitation\n");
2878                 goto out;
2879         }
2880
2881         /* Enable main watchdog in OTP */
2882         ret = abx500_set_register_interruptible(di->dev,
2883                 AB8500_OTP_EMUL, AB8500_OTP_CONF_15, OTP_ENABLE_WD);
2884         if (ret) {
2885                 dev_err(di->dev, "failed to enable main WD in OTP\n");
2886                 goto out;
2887         }
2888
2889         /* Enable main watchdog */
2890         ret = abx500_set_register_interruptible(di->dev,
2891                 AB8500_SYS_CTRL2_BLOCK,
2892                 AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_ENA);
2893         if (ret) {
2894                 dev_err(di->dev, "faile to enable main watchdog\n");
2895                 goto out;
2896         }
2897
2898         /*
2899          * Due to internal synchronisation, Enable and Kick watchdog bits
2900          * cannot be enabled in a single write.
2901          * A minimum delay of 2*32 kHz period (62.5µs) must be inserted
2902          * between writing Enable then Kick bits.
2903          */
2904         udelay(63);
2905
2906         /* Kick main watchdog */
2907         ret = abx500_set_register_interruptible(di->dev,
2908                 AB8500_SYS_CTRL2_BLOCK,
2909                 AB8500_MAIN_WDOG_CTRL_REG,
2910                 (MAIN_WDOG_ENA | MAIN_WDOG_KICK));
2911         if (ret) {
2912                 dev_err(di->dev, "failed to kick main watchdog\n");
2913                 goto out;
2914         }
2915
2916         /* Disable main watchdog */
2917         ret = abx500_set_register_interruptible(di->dev,
2918                 AB8500_SYS_CTRL2_BLOCK,
2919                 AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_DIS);
2920         if (ret) {
2921                 dev_err(di->dev, "failed to disable main watchdog\n");
2922                 goto out;
2923         }
2924
2925         /* Set watchdog timeout */
2926         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
2927                 AB8500_CH_WD_TIMER_REG, WD_TIMER);
2928         if (ret) {
2929                 dev_err(di->dev, "failed to set charger watchdog timeout\n");
2930                 goto out;
2931         }
2932
2933         /* Set charger watchdog timeout */
2934         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
2935                 AB8500_CH_WD_TIMER_REG, WD_TIMER);
2936         if (ret) {
2937                 dev_err(di->dev, "failed to set charger watchdog timeout\n");
2938                 goto out;
2939         }
2940
2941         ret = ab8500_charger_led_en(di, false);
2942         if (ret < 0) {
2943                 dev_err(di->dev, "failed to disable LED\n");
2944                 goto out;
2945         }
2946
2947         /* Backup battery voltage and current */
2948         ret = abx500_set_register_interruptible(di->dev,
2949                 AB8500_RTC,
2950                 AB8500_RTC_BACKUP_CHG_REG,
2951                 di->bm->bkup_bat_v |
2952                 di->bm->bkup_bat_i);
2953         if (ret) {
2954                 dev_err(di->dev, "failed to setup backup battery charging\n");
2955                 goto out;
2956         }
2957
2958         /* Enable backup battery charging */
2959         abx500_mask_and_set_register_interruptible(di->dev,
2960                 AB8500_RTC, AB8500_RTC_CTRL_REG,
2961                 RTC_BUP_CH_ENA, RTC_BUP_CH_ENA);
2962         if (ret < 0)
2963                 dev_err(di->dev, "%s mask and set failed\n", __func__);
2964
2965 out:
2966         return ret;
2967 }
2968
2969 /*
2970  * ab8500 charger driver interrupts and their respective isr
2971  */
2972 static struct ab8500_charger_interrupts ab8500_charger_irq[] = {
2973         {"MAIN_CH_UNPLUG_DET", ab8500_charger_mainchunplugdet_handler},
2974         {"MAIN_CHARGE_PLUG_DET", ab8500_charger_mainchplugdet_handler},
2975         {"MAIN_EXT_CH_NOT_OK", ab8500_charger_mainextchnotok_handler},
2976         {"MAIN_CH_TH_PROT_R", ab8500_charger_mainchthprotr_handler},
2977         {"MAIN_CH_TH_PROT_F", ab8500_charger_mainchthprotf_handler},
2978         {"VBUS_DET_F", ab8500_charger_vbusdetf_handler},
2979         {"VBUS_DET_R", ab8500_charger_vbusdetr_handler},
2980         {"USB_LINK_STATUS", ab8500_charger_usblinkstatus_handler},
2981         {"USB_CH_TH_PROT_R", ab8500_charger_usbchthprotr_handler},
2982         {"USB_CH_TH_PROT_F", ab8500_charger_usbchthprotf_handler},
2983         {"USB_CHARGER_NOT_OKR", ab8500_charger_usbchargernotokr_handler},
2984         {"VBUS_OVV", ab8500_charger_vbusovv_handler},
2985         {"CH_WD_EXP", ab8500_charger_chwdexp_handler},
2986         {"VBUS_CH_DROP_END", ab8500_charger_vbuschdropend_handler},
2987 };
2988
2989 static int ab8500_charger_usb_notifier_call(struct notifier_block *nb,
2990                 unsigned long event, void *power)
2991 {
2992         struct ab8500_charger *di =
2993                 container_of(nb, struct ab8500_charger, nb);
2994         enum ab8500_usb_state bm_usb_state;
2995         unsigned mA = *((unsigned *)power);
2996
2997         if (!di)
2998                 return NOTIFY_DONE;
2999
3000         if (event != USB_EVENT_VBUS) {
3001                 dev_dbg(di->dev, "not a standard host, returning\n");
3002                 return NOTIFY_DONE;
3003         }
3004
3005         /* TODO: State is fabricate  here. See if charger really needs USB
3006          * state or if mA is enough
3007          */
3008         if ((di->usb_state.usb_current == 2) && (mA > 2))
3009                 bm_usb_state = AB8500_BM_USB_STATE_RESUME;
3010         else if (mA == 0)
3011                 bm_usb_state = AB8500_BM_USB_STATE_RESET_HS;
3012         else if (mA == 2)
3013                 bm_usb_state = AB8500_BM_USB_STATE_SUSPEND;
3014         else if (mA >= 8) /* 8, 100, 500 */
3015                 bm_usb_state = AB8500_BM_USB_STATE_CONFIGURED;
3016         else /* Should never occur */
3017                 bm_usb_state = AB8500_BM_USB_STATE_RESET_FS;
3018
3019         dev_dbg(di->dev, "%s usb_state: 0x%02x mA: %d\n",
3020                 __func__, bm_usb_state, mA);
3021
3022         spin_lock(&di->usb_state.usb_lock);
3023         di->usb_state.state_tmp = bm_usb_state;
3024         di->usb_state.usb_current_tmp = mA;
3025         spin_unlock(&di->usb_state.usb_lock);
3026
3027         /*
3028          * wait for some time until you get updates from the usb stack
3029          * and negotiations are completed
3030          */
3031         queue_delayed_work(di->charger_wq, &di->usb_state_changed_work, HZ/2);
3032
3033         return NOTIFY_OK;
3034 }
3035
3036 #if defined(CONFIG_PM)
3037 static int ab8500_charger_resume(struct platform_device *pdev)
3038 {
3039         int ret;
3040         struct ab8500_charger *di = platform_get_drvdata(pdev);
3041
3042         /*
3043          * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
3044          * logic. That means we have to continously kick the charger
3045          * watchdog even when no charger is connected. This is only
3046          * valid once the AC charger has been enabled. This is
3047          * a bug that is not handled by the algorithm and the
3048          * watchdog have to be kicked by the charger driver
3049          * when the AC charger is disabled
3050          */
3051         if (di->ac_conn && is_ab8500_1p1_or_earlier(di->parent)) {
3052                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
3053                         AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
3054                 if (ret)
3055                         dev_err(di->dev, "Failed to kick WD!\n");
3056
3057                 /* If not already pending start a new timer */
3058                 if (!delayed_work_pending(
3059                         &di->kick_wd_work)) {
3060                         queue_delayed_work(di->charger_wq, &di->kick_wd_work,
3061                                 round_jiffies(WD_KICK_INTERVAL));
3062                 }
3063         }
3064
3065         /* If we still have a HW failure, schedule a new check */
3066         if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
3067                 queue_delayed_work(di->charger_wq,
3068                         &di->check_hw_failure_work, 0);
3069         }
3070
3071         if (di->flags.vbus_drop_end)
3072                 queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work, 0);
3073
3074         return 0;
3075 }
3076
3077 static int ab8500_charger_suspend(struct platform_device *pdev,
3078         pm_message_t state)
3079 {
3080         struct ab8500_charger *di = platform_get_drvdata(pdev);
3081
3082         /* Cancel any pending HW failure check */
3083         if (delayed_work_pending(&di->check_hw_failure_work))
3084                 cancel_delayed_work(&di->check_hw_failure_work);
3085
3086         if (delayed_work_pending(&di->vbus_drop_end_work))
3087                 cancel_delayed_work(&di->vbus_drop_end_work);
3088
3089         flush_delayed_work(&di->attach_work);
3090         flush_delayed_work(&di->usb_charger_attached_work);
3091         flush_delayed_work(&di->ac_charger_attached_work);
3092         flush_delayed_work(&di->check_usbchgnotok_work);
3093         flush_delayed_work(&di->check_vbat_work);
3094         flush_delayed_work(&di->kick_wd_work);
3095
3096         flush_work(&di->usb_link_status_work);
3097         flush_work(&di->ac_work);
3098         flush_work(&di->detect_usb_type_work);
3099
3100         if (atomic_read(&di->current_stepping_sessions))
3101                 return -EAGAIN;
3102
3103         return 0;
3104 }
3105 #else
3106 #define ab8500_charger_suspend      NULL
3107 #define ab8500_charger_resume       NULL
3108 #endif
3109
3110 static int ab8500_charger_remove(struct platform_device *pdev)
3111 {
3112         struct ab8500_charger *di = platform_get_drvdata(pdev);
3113         int i, irq, ret;
3114
3115         /* Disable AC charging */
3116         ab8500_charger_ac_en(&di->ac_chg, false, 0, 0);
3117
3118         /* Disable USB charging */
3119         ab8500_charger_usb_en(&di->usb_chg, false, 0, 0);
3120
3121         /* Disable interrupts */
3122         for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
3123                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3124                 free_irq(irq, di);
3125         }
3126
3127         /* Backup battery voltage and current disable */
3128         ret = abx500_mask_and_set_register_interruptible(di->dev,
3129                 AB8500_RTC, AB8500_RTC_CTRL_REG, RTC_BUP_CH_ENA, 0);
3130         if (ret < 0)
3131                 dev_err(di->dev, "%s mask and set failed\n", __func__);
3132
3133         usb_unregister_notifier(di->usb_phy, &di->nb);
3134         usb_put_phy(di->usb_phy);
3135
3136         /* Delete the work queue */
3137         destroy_workqueue(di->charger_wq);
3138
3139         flush_scheduled_work();
3140         if(di->usb_chg.enabled)
3141                 power_supply_unregister(&di->usb_chg.psy);
3142 #if !defined(CONFIG_CHARGER_PM2301)
3143         if(di->ac_chg.enabled)
3144                 power_supply_unregister(&di->ac_chg.psy);
3145 #endif
3146         platform_set_drvdata(pdev, NULL);
3147
3148         return 0;
3149 }
3150
3151 static char *supply_interface[] = {
3152         "ab8500_chargalg",
3153         "ab8500_fg",
3154         "ab8500_btemp",
3155 };
3156
3157 static int ab8500_charger_probe(struct platform_device *pdev)
3158 {
3159         struct device_node *np = pdev->dev.of_node;
3160         struct abx500_bm_data *plat = pdev->dev.platform_data;
3161         struct ab8500_charger *di;
3162         int irq, i, charger_status, ret = 0, ch_stat;
3163
3164         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
3165         if (!di) {
3166                 dev_err(&pdev->dev, "%s no mem for ab8500_charger\n", __func__);
3167                 return -ENOMEM;
3168         }
3169
3170         if (!plat) {
3171                 dev_err(&pdev->dev, "no battery management data supplied\n");
3172                 return -EINVAL;
3173         }
3174         di->bm = plat;
3175
3176         if (np) {
3177                 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
3178                 if (ret) {
3179                         dev_err(&pdev->dev, "failed to get battery information\n");
3180                         return ret;
3181                 }
3182                 di->autopower_cfg = of_property_read_bool(np, "autopower_cfg");
3183         } else
3184                 di->autopower_cfg = false;
3185
3186         /* get parent data */
3187         di->dev = &pdev->dev;
3188         di->parent = dev_get_drvdata(pdev->dev.parent);
3189         di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
3190
3191         /* initialize lock */
3192         spin_lock_init(&di->usb_state.usb_lock);
3193         mutex_init(&di->usb_ipt_crnt_lock);
3194
3195         di->autopower = false;
3196         di->invalid_charger_detect_state = 0;
3197
3198         /* AC supply */
3199         /* power_supply base class */
3200         di->ac_chg.psy.name = "ab8500_ac";
3201         di->ac_chg.psy.type = POWER_SUPPLY_TYPE_MAINS;
3202         di->ac_chg.psy.properties = ab8500_charger_ac_props;
3203         di->ac_chg.psy.num_properties = ARRAY_SIZE(ab8500_charger_ac_props);
3204         di->ac_chg.psy.get_property = ab8500_charger_ac_get_property;
3205         di->ac_chg.psy.supplied_to = supply_interface;
3206         di->ac_chg.psy.num_supplicants = ARRAY_SIZE(supply_interface),
3207         /* ux500_charger sub-class */
3208         di->ac_chg.ops.enable = &ab8500_charger_ac_en;
3209         di->ac_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
3210         di->ac_chg.ops.update_curr = &ab8500_charger_update_charger_current;
3211         di->ac_chg.max_out_volt = ab8500_charger_voltage_map[
3212                 ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
3213         di->ac_chg.max_out_curr = ab8500_charger_current_map[
3214                 ARRAY_SIZE(ab8500_charger_current_map) - 1];
3215         di->ac_chg.wdt_refresh = CHG_WD_INTERVAL;
3216         di->ac_chg.enabled = di->bm->ac_enabled;
3217         di->ac_chg.external = false;
3218
3219         /* USB supply */
3220         /* power_supply base class */
3221         di->usb_chg.psy.name = "ab8500_usb";
3222         di->usb_chg.psy.type = POWER_SUPPLY_TYPE_USB;
3223         di->usb_chg.psy.properties = ab8500_charger_usb_props;
3224         di->usb_chg.psy.num_properties = ARRAY_SIZE(ab8500_charger_usb_props);
3225         di->usb_chg.psy.get_property = ab8500_charger_usb_get_property;
3226         di->usb_chg.psy.supplied_to = supply_interface;
3227         di->usb_chg.psy.num_supplicants = ARRAY_SIZE(supply_interface),
3228         /* ux500_charger sub-class */
3229         di->usb_chg.ops.enable = &ab8500_charger_usb_en;
3230         di->usb_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
3231         di->usb_chg.ops.update_curr = &ab8500_charger_update_charger_current;
3232         di->usb_chg.max_out_volt = ab8500_charger_voltage_map[
3233                 ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
3234         di->usb_chg.max_out_curr = ab8500_charger_current_map[
3235                 ARRAY_SIZE(ab8500_charger_current_map) - 1];
3236         di->usb_chg.wdt_refresh = CHG_WD_INTERVAL;
3237         di->usb_chg.enabled = di->bm->usb_enabled;
3238         di->usb_chg.external = false;
3239
3240         /* Create a work queue for the charger */
3241         di->charger_wq =
3242                 create_singlethread_workqueue("ab8500_charger_wq");
3243         if (di->charger_wq == NULL) {
3244                 dev_err(di->dev, "failed to create work queue\n");
3245                 return -ENOMEM;
3246         }
3247
3248         mutex_init(&di->charger_attached_mutex);
3249
3250         /* Init work for HW failure check */
3251         INIT_DEFERRABLE_WORK(&di->check_hw_failure_work,
3252                 ab8500_charger_check_hw_failure_work);
3253         INIT_DEFERRABLE_WORK(&di->check_usbchgnotok_work,
3254                 ab8500_charger_check_usbchargernotok_work);
3255
3256         INIT_DELAYED_WORK(&di->ac_charger_attached_work,
3257                           ab8500_charger_ac_attached_work);
3258         INIT_DELAYED_WORK(&di->usb_charger_attached_work,
3259                           ab8500_charger_usb_attached_work);
3260
3261         /*
3262          * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
3263          * logic. That means we have to continously kick the charger
3264          * watchdog even when no charger is connected. This is only
3265          * valid once the AC charger has been enabled. This is
3266          * a bug that is not handled by the algorithm and the
3267          * watchdog have to be kicked by the charger driver
3268          * when the AC charger is disabled
3269          */
3270         INIT_DEFERRABLE_WORK(&di->kick_wd_work,
3271                 ab8500_charger_kick_watchdog_work);
3272
3273         INIT_DEFERRABLE_WORK(&di->check_vbat_work,
3274                 ab8500_charger_check_vbat_work);
3275
3276         INIT_DELAYED_WORK(&di->attach_work,
3277                 ab8500_charger_usb_link_attach_work);
3278
3279         INIT_DELAYED_WORK(&di->usb_state_changed_work,
3280                 ab8500_charger_usb_state_changed_work);
3281
3282         INIT_DELAYED_WORK(&di->vbus_drop_end_work,
3283                 ab8500_charger_vbus_drop_end_work);
3284
3285         /* Init work for charger detection */
3286         INIT_WORK(&di->usb_link_status_work,
3287                 ab8500_charger_usb_link_status_work);
3288         INIT_WORK(&di->ac_work, ab8500_charger_ac_work);
3289         INIT_WORK(&di->detect_usb_type_work,
3290                 ab8500_charger_detect_usb_type_work);
3291
3292         /* Init work for checking HW status */
3293         INIT_WORK(&di->check_main_thermal_prot_work,
3294                 ab8500_charger_check_main_thermal_prot_work);
3295         INIT_WORK(&di->check_usb_thermal_prot_work,
3296                 ab8500_charger_check_usb_thermal_prot_work);
3297
3298         /*
3299          * VDD ADC supply needs to be enabled from this driver when there
3300          * is a charger connected to avoid erroneous BTEMP_HIGH/LOW
3301          * interrupts during charging
3302          */
3303         di->regu = devm_regulator_get(di->dev, "vddadc");
3304         if (IS_ERR(di->regu)) {
3305                 ret = PTR_ERR(di->regu);
3306                 dev_err(di->dev, "failed to get vddadc regulator\n");
3307                 goto free_charger_wq;
3308         }
3309
3310
3311         /* Initialize OVV, and other registers */
3312         ret = ab8500_charger_init_hw_registers(di);
3313         if (ret) {
3314                 dev_err(di->dev, "failed to initialize ABB registers\n");
3315                 goto free_charger_wq;
3316         }
3317
3318         /* Register AC charger class */
3319         if(di->ac_chg.enabled) {
3320                 ret = power_supply_register(di->dev, &di->ac_chg.psy);
3321                 if (ret) {
3322                         dev_err(di->dev, "failed to register AC charger\n");
3323                         goto free_charger_wq;
3324                 }
3325         }
3326
3327         /* Register USB charger class */
3328         if(di->usb_chg.enabled) {
3329                 ret = power_supply_register(di->dev, &di->usb_chg.psy);
3330                 if (ret) {
3331                         dev_err(di->dev, "failed to register USB charger\n");
3332                         goto free_ac;
3333                 }
3334         }
3335
3336         di->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
3337         if (IS_ERR_OR_NULL(di->usb_phy)) {
3338                 dev_err(di->dev, "failed to get usb transceiver\n");
3339                 ret = -EINVAL;
3340                 goto free_usb;
3341         }
3342         di->nb.notifier_call = ab8500_charger_usb_notifier_call;
3343         ret = usb_register_notifier(di->usb_phy, &di->nb);
3344         if (ret) {
3345                 dev_err(di->dev, "failed to register usb notifier\n");
3346                 goto put_usb_phy;
3347         }
3348
3349         /* Identify the connected charger types during startup */
3350         charger_status = ab8500_charger_detect_chargers(di, true);
3351         if (charger_status & AC_PW_CONN) {
3352                 di->ac.charger_connected = 1;
3353                 di->ac_conn = true;
3354                 ab8500_power_supply_changed(di, &di->ac_chg.psy);
3355                 sysfs_notify(&di->ac_chg.psy.dev->kobj, NULL, "present");
3356         }
3357
3358         if (charger_status & USB_PW_CONN) {
3359                 di->vbus_detected = true;
3360                 di->vbus_detected_start = true;
3361                 queue_work(di->charger_wq,
3362                         &di->detect_usb_type_work);
3363         }
3364
3365         /* Register interrupts */
3366         for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
3367                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3368                 ret = request_threaded_irq(irq, NULL, ab8500_charger_irq[i].isr,
3369                         IRQF_SHARED | IRQF_NO_SUSPEND,
3370                         ab8500_charger_irq[i].name, di);
3371
3372                 if (ret != 0) {
3373                         dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
3374                                 , ab8500_charger_irq[i].name, irq, ret);
3375                         goto free_irq;
3376                 }
3377                 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
3378                         ab8500_charger_irq[i].name, irq, ret);
3379         }
3380
3381         platform_set_drvdata(pdev, di);
3382
3383         mutex_lock(&di->charger_attached_mutex);
3384
3385         ch_stat = ab8500_charger_detect_chargers(di, false);
3386
3387         if ((ch_stat & AC_PW_CONN) == AC_PW_CONN) {
3388                 queue_delayed_work(di->charger_wq,
3389                                    &di->ac_charger_attached_work,
3390                                    HZ);
3391         }
3392         if ((ch_stat & USB_PW_CONN) == USB_PW_CONN) {
3393                 queue_delayed_work(di->charger_wq,
3394                                    &di->usb_charger_attached_work,
3395                                    HZ);
3396         }
3397
3398         mutex_unlock(&di->charger_attached_mutex);
3399
3400         return ret;
3401
3402 free_irq:
3403         usb_unregister_notifier(di->usb_phy, &di->nb);
3404
3405         /* We also have to free all successfully registered irqs */
3406         for (i = i - 1; i >= 0; i--) {
3407                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3408                 free_irq(irq, di);
3409         }
3410 put_usb_phy:
3411         usb_put_phy(di->usb_phy);
3412 free_usb:
3413         if(di->usb_chg.enabled)
3414                 power_supply_unregister(&di->usb_chg.psy);
3415 free_ac:
3416         if(di->ac_chg.enabled)
3417                 power_supply_unregister(&di->ac_chg.psy);
3418 free_charger_wq:
3419         destroy_workqueue(di->charger_wq);
3420         return ret;
3421 }
3422
3423 static const struct of_device_id ab8500_charger_match[] = {
3424         { .compatible = "stericsson,ab8500-charger", },
3425         { },
3426 };
3427
3428 static struct platform_driver ab8500_charger_driver = {
3429         .probe = ab8500_charger_probe,
3430         .remove = ab8500_charger_remove,
3431         .suspend = ab8500_charger_suspend,
3432         .resume = ab8500_charger_resume,
3433         .driver = {
3434                 .name = "ab8500-charger",
3435                 .owner = THIS_MODULE,
3436                 .of_match_table = ab8500_charger_match,
3437         },
3438 };
3439
3440 static int __init ab8500_charger_init(void)
3441 {
3442         return platform_driver_register(&ab8500_charger_driver);
3443 }
3444
3445 static void __exit ab8500_charger_exit(void)
3446 {
3447         platform_driver_unregister(&ab8500_charger_driver);
3448 }
3449
3450 subsys_initcall_sync(ab8500_charger_init);
3451 module_exit(ab8500_charger_exit);
3452
3453 MODULE_LICENSE("GPL v2");
3454 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
3455 MODULE_ALIAS("platform:ab8500-charger");
3456 MODULE_DESCRIPTION("AB8500 charger management driver");