drivers/power/axp288_charger.c

   1 /*
   2  * axp288_charger.c - X-power AXP288 PMIC Charger driver
   3  *
   4  * Copyright (C) 2014 Intel Corporation
   5  * Author: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/device.h>
  19 #include <linux/regmap.h>
  20 #include <linux/workqueue.h>
  21 #include <linux/delay.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/usb/otg.h>
  24 #include <linux/notifier.h>
  25 #include <linux/power_supply.h>
  26 #include <linux/notifier.h>
  27 #include <linux/property.h>
  28 #include <linux/mfd/axp20x.h>
  29 #include <linux/extcon.h>
  30
  31 #define PS_STAT_VBUS_TRIGGER            (1 << 0)
  32 #define PS_STAT_BAT_CHRG_DIR            (1 << 2)
  33 #define PS_STAT_VBAT_ABOVE_VHOLD        (1 << 3)
  34 #define PS_STAT_VBUS_VALID              (1 << 4)
  35 #define PS_STAT_VBUS_PRESENT            (1 << 5)
  36
  37 #define CHRG_STAT_BAT_SAFE_MODE         (1 << 3)
  38 #define CHRG_STAT_BAT_VALID             (1 << 4)
  39 #define CHRG_STAT_BAT_PRESENT           (1 << 5)
  40 #define CHRG_STAT_CHARGING              (1 << 6)
  41 #define CHRG_STAT_PMIC_OTP              (1 << 7)
  42
  43 #define VBUS_ISPOUT_CUR_LIM_MASK        0x03
  44 #define VBUS_ISPOUT_CUR_LIM_BIT_POS     0
  45 #define VBUS_ISPOUT_CUR_LIM_900MA       0x0     /* 900mA */
  46 #define VBUS_ISPOUT_CUR_LIM_1500MA      0x1     /* 1500mA */
  47 #define VBUS_ISPOUT_CUR_LIM_2000MA      0x2     /* 2000mA */
  48 #define VBUS_ISPOUT_CUR_NO_LIM          0x3     /* 2500mA */
  49 #define VBUS_ISPOUT_VHOLD_SET_MASK      0x31
  50 #define VBUS_ISPOUT_VHOLD_SET_BIT_POS   0x3
  51 #define VBUS_ISPOUT_VHOLD_SET_OFFSET    4000    /* 4000mV */
  52 #define VBUS_ISPOUT_VHOLD_SET_LSB_RES   100     /* 100mV */
  53 #define VBUS_ISPOUT_VHOLD_SET_4300MV    0x3     /* 4300mV */
  54 #define VBUS_ISPOUT_VBUS_PATH_DIS       (1 << 7)
  55
  56 #define CHRG_CCCV_CC_MASK               0xf             /* 4 bits */
  57 #define CHRG_CCCV_CC_BIT_POS            0
  58 #define CHRG_CCCV_CC_OFFSET             200             /* 200mA */
  59 #define CHRG_CCCV_CC_LSB_RES            200             /* 200mA */
  60 #define CHRG_CCCV_ITERM_20P             (1 << 4)        /* 20% of CC */
  61 #define CHRG_CCCV_CV_MASK               0x60            /* 2 bits */
  62 #define CHRG_CCCV_CV_BIT_POS            5
  63 #define CHRG_CCCV_CV_4100MV             0x0             /* 4.10V */
  64 #define CHRG_CCCV_CV_4150MV             0x1             /* 4.15V */
  65 #define CHRG_CCCV_CV_4200MV             0x2             /* 4.20V */
  66 #define CHRG_CCCV_CV_4350MV             0x3             /* 4.35V */
  67 #define CHRG_CCCV_CHG_EN                (1 << 7)
  68
  69 #define CNTL2_CC_TIMEOUT_MASK           0x3     /* 2 bits */
  70 #define CNTL2_CC_TIMEOUT_OFFSET         6       /* 6 Hrs */
  71 #define CNTL2_CC_TIMEOUT_LSB_RES        2       /* 2 Hrs */
  72 #define CNTL2_CC_TIMEOUT_12HRS          0x3     /* 12 Hrs */
  73 #define CNTL2_CHGLED_TYPEB              (1 << 4)
  74 #define CNTL2_CHG_OUT_TURNON            (1 << 5)
  75 #define CNTL2_PC_TIMEOUT_MASK           0xC0
  76 #define CNTL2_PC_TIMEOUT_OFFSET         40      /* 40 mins */
  77 #define CNTL2_PC_TIMEOUT_LSB_RES        10      /* 10 mins */
  78 #define CNTL2_PC_TIMEOUT_70MINS         0x3
  79
  80 #define CHRG_ILIM_TEMP_LOOP_EN          (1 << 3)
  81 #define CHRG_VBUS_ILIM_MASK             0xf0
  82 #define CHRG_VBUS_ILIM_BIT_POS          4
  83 #define CHRG_VBUS_ILIM_100MA            0x0     /* 100mA */
  84 #define CHRG_VBUS_ILIM_500MA            0x1     /* 500mA */
  85 #define CHRG_VBUS_ILIM_900MA            0x2     /* 900mA */
  86 #define CHRG_VBUS_ILIM_1500MA           0x3     /* 1500mA */
  87 #define CHRG_VBUS_ILIM_2000MA           0x4     /* 2000mA */
  88 #define CHRG_VBUS_ILIM_2500MA           0x5     /* 2500mA */
  89 #define CHRG_VBUS_ILIM_3000MA           0x6     /* 3000mA */
  90
  91 #define CHRG_VLTFC_0C                   0xA5    /* 0 DegC */
  92 #define CHRG_VHTFC_45C                  0x1F    /* 45 DegC */
  93
  94 #define BAT_IRQ_CFG_CHRG_DONE           (1 << 2)
  95 #define BAT_IRQ_CFG_CHRG_START          (1 << 3)
  96 #define BAT_IRQ_CFG_BAT_SAFE_EXIT       (1 << 4)
  97 #define BAT_IRQ_CFG_BAT_SAFE_ENTER      (1 << 5)
  98 #define BAT_IRQ_CFG_BAT_DISCON          (1 << 6)
  99 #define BAT_IRQ_CFG_BAT_CONN            (1 << 7)
 100 #define BAT_IRQ_CFG_BAT_MASK            0xFC
 101
 102 #define TEMP_IRQ_CFG_QCBTU              (1 << 4)
 103 #define TEMP_IRQ_CFG_CBTU               (1 << 5)
 104 #define TEMP_IRQ_CFG_QCBTO              (1 << 6)
 105 #define TEMP_IRQ_CFG_CBTO               (1 << 7)
 106 #define TEMP_IRQ_CFG_MASK               0xF0
 107
 108 #define FG_CNTL_OCV_ADJ_EN              (1 << 3)
 109
 110 #define CV_4100MV                       4100    /* 4100mV */
 111 #define CV_4150MV                       4150    /* 4150mV */
 112 #define CV_4200MV                       4200    /* 4200mV */
 113 #define CV_4350MV                       4350    /* 4350mV */
 114
 115 #define CC_200MA                        200     /*  200mA */
 116 #define CC_600MA                        600     /*  600mA */
 117 #define CC_800MA                        800     /*  800mA */
 118 #define CC_1000MA                       1000    /* 1000mA */
 119 #define CC_1600MA                       1600    /* 1600mA */
 120 #define CC_2000MA                       2000    /* 2000mA */
 121
 122 #define ILIM_100MA                      100     /* 100mA */
 123 #define ILIM_500MA                      500     /* 500mA */
 124 #define ILIM_900MA                      900     /* 900mA */
 125 #define ILIM_1500MA                     1500    /* 1500mA */
 126 #define ILIM_2000MA                     2000    /* 2000mA */
 127 #define ILIM_2500MA                     2500    /* 2500mA */
 128 #define ILIM_3000MA                     3000    /* 3000mA */
 129
 130 #define AXP288_EXTCON_DEV_NAME          "axp288_extcon"
 131
 132 enum {
 133         VBUS_OV_IRQ = 0,
 134         CHARGE_DONE_IRQ,
 135         CHARGE_CHARGING_IRQ,
 136         BAT_SAFE_QUIT_IRQ,
 137         BAT_SAFE_ENTER_IRQ,
 138         QCBTU_IRQ,
 139         CBTU_IRQ,
 140         QCBTO_IRQ,
 141         CBTO_IRQ,
 142         CHRG_INTR_END,
 143 };
 144
 145 struct axp288_chrg_info {
 146         struct platform_device *pdev;
 147         struct axp20x_chrg_pdata *pdata;
 148         struct regmap *regmap;
 149         struct regmap_irq_chip_data *regmap_irqc;
 150         int irq[CHRG_INTR_END];
 151         struct power_supply *psy_usb;
 152         struct mutex lock;
 153
 154         /* OTG/Host mode */
 155         struct {
 156                 struct work_struct work;
 157                 struct extcon_dev *cable;
 158                 struct notifier_block id_nb;
 159                 bool id_short;
 160         } otg;
 161
 162         /* SDP/CDP/DCP USB charging cable notifications */
 163         struct {
 164                 struct extcon_dev *edev;
 165                 bool connected;
 166                 enum power_supply_type chg_type;
 167                 struct notifier_block nb;
 168                 struct work_struct work;
 169         } cable;
 170
 171         int health;
 172         int inlmt;
 173         int cc;
 174         int cv;
 175         int max_cc;
 176         int max_cv;
 177         bool online;
 178         bool present;
 179         bool enable_charger;
 180         bool is_charger_enabled;
 181 };
 182
 183 static inline int axp288_charger_set_cc(struct axp288_chrg_info *info, int cc)
 184 {
 185         u8 reg_val;
 186         int ret;
 187
 188         if (cc < CHRG_CCCV_CC_OFFSET)
 189                 cc = CHRG_CCCV_CC_OFFSET;
 190         else if (cc > info->max_cc)
 191                 cc = info->max_cc;
 192
 193         reg_val = (cc - CHRG_CCCV_CC_OFFSET) / CHRG_CCCV_CC_LSB_RES;
 194         cc = (reg_val * CHRG_CCCV_CC_LSB_RES) + CHRG_CCCV_CC_OFFSET;
 195         reg_val = reg_val << CHRG_CCCV_CC_BIT_POS;
 196
 197         ret = regmap_update_bits(info->regmap,
 198                                 AXP20X_CHRG_CTRL1,
 199                                 CHRG_CCCV_CC_MASK, reg_val);
 200         if (ret >= 0)
 201                 info->cc = cc;
 202
 203         return ret;
 204 }
 205
 206 static inline int axp288_charger_set_cv(struct axp288_chrg_info *info, int cv)
 207 {
 208         u8 reg_val;
 209         int ret;
 210
 211         if (cv <= CV_4100MV) {
 212                 reg_val = CHRG_CCCV_CV_4100MV;
 213                 cv = CV_4100MV;
 214         } else if (cv <= CV_4150MV) {
 215                 reg_val = CHRG_CCCV_CV_4150MV;
 216                 cv = CV_4150MV;
 217         } else if (cv <= CV_4200MV) {
 218                 reg_val = CHRG_CCCV_CV_4200MV;
 219                 cv = CV_4200MV;
 220         } else {
 221                 reg_val = CHRG_CCCV_CV_4350MV;
 222                 cv = CV_4350MV;
 223         }
 224
 225         reg_val = reg_val << CHRG_CCCV_CV_BIT_POS;
 226
 227         ret = regmap_update_bits(info->regmap,
 228                                 AXP20X_CHRG_CTRL1,
 229                                 CHRG_CCCV_CV_MASK, reg_val);
 230
 231         if (ret >= 0)
 232                 info->cv = cv;
 233
 234         return ret;
 235 }
 236
 237 static inline int axp288_charger_set_vbus_inlmt(struct axp288_chrg_info *info,
 238                                            int inlmt)
 239 {
 240         int ret;
 241         unsigned int val;
 242         u8 reg_val;
 243
 244         /* Read in limit register */
 245         ret = regmap_read(info->regmap, AXP20X_CHRG_BAK_CTRL, &val);
 246         if (ret < 0)
 247                 goto set_inlmt_fail;
 248
 249         if (inlmt <= ILIM_100MA) {
 250                 reg_val = CHRG_VBUS_ILIM_100MA;
 251                 inlmt = ILIM_100MA;
 252         } else if (inlmt <= ILIM_500MA) {
 253                 reg_val = CHRG_VBUS_ILIM_500MA;
 254                 inlmt = ILIM_500MA;
 255         } else if (inlmt <= ILIM_900MA) {
 256                 reg_val = CHRG_VBUS_ILIM_900MA;
 257                 inlmt = ILIM_900MA;
 258         } else if (inlmt <= ILIM_1500MA) {
 259                 reg_val = CHRG_VBUS_ILIM_1500MA;
 260                 inlmt = ILIM_1500MA;
 261         } else if (inlmt <= ILIM_2000MA) {
 262                 reg_val = CHRG_VBUS_ILIM_2000MA;
 263                 inlmt = ILIM_2000MA;
 264         } else if (inlmt <= ILIM_2500MA) {
 265                 reg_val = CHRG_VBUS_ILIM_2500MA;
 266                 inlmt = ILIM_2500MA;
 267         } else {
 268                 reg_val = CHRG_VBUS_ILIM_3000MA;
 269                 inlmt = ILIM_3000MA;
 270         }
 271
 272         reg_val = (val & ~CHRG_VBUS_ILIM_MASK)
 273                         | (reg_val << CHRG_VBUS_ILIM_BIT_POS);
 274         ret = regmap_write(info->regmap, AXP20X_CHRG_BAK_CTRL, reg_val);
 275         if (ret >= 0)
 276                 info->inlmt = inlmt;
 277         else
 278                 dev_err(&info->pdev->dev, "charger BAK control %d\n", ret);
 279
 280
 281 set_inlmt_fail:
 282         return ret;
 283 }
 284
 285 static int axp288_charger_vbus_path_select(struct axp288_chrg_info *info,
 286                                                                 bool enable)
 287 {
 288         int ret;
 289
 290         if (enable)
 291                 ret = regmap_update_bits(info->regmap, AXP20X_VBUS_IPSOUT_MGMT,
 292                                         VBUS_ISPOUT_VBUS_PATH_DIS, 0);
 293         else
 294                 ret = regmap_update_bits(info->regmap, AXP20X_VBUS_IPSOUT_MGMT,
 295                         VBUS_ISPOUT_VBUS_PATH_DIS, VBUS_ISPOUT_VBUS_PATH_DIS);
 296
 297         if (ret < 0)
 298                 dev_err(&info->pdev->dev, "axp288 vbus path select %d\n", ret);
 299
 300
 301         return ret;
 302 }
 303
 304 static int axp288_charger_enable_charger(struct axp288_chrg_info *info,
 305                                                                 bool enable)
 306 {
 307         int ret;
 308
 309         if (enable)
 310                 ret = regmap_update_bits(info->regmap, AXP20X_CHRG_CTRL1,
 311                                 CHRG_CCCV_CHG_EN, CHRG_CCCV_CHG_EN);
 312         else
 313                 ret = regmap_update_bits(info->regmap, AXP20X_CHRG_CTRL1,
 314                                 CHRG_CCCV_CHG_EN, 0);
 315         if (ret < 0)
 316                 dev_err(&info->pdev->dev, "axp288 enable charger %d\n", ret);
 317         else
 318                 info->is_charger_enabled = enable;
 319
 320         return ret;
 321 }
 322
 323 static int axp288_charger_is_present(struct axp288_chrg_info *info)
 324 {
 325         int ret, present = 0;
 326         unsigned int val;
 327
 328         ret = regmap_read(info->regmap, AXP20X_PWR_INPUT_STATUS, &val);
 329         if (ret < 0)
 330                 return ret;
 331
 332         if (val & PS_STAT_VBUS_PRESENT)
 333                 present = 1;
 334         return present;
 335 }
 336
 337 static int axp288_charger_is_online(struct axp288_chrg_info *info)
 338 {
 339         int ret, online = 0;
 340         unsigned int val;
 341
 342         ret = regmap_read(info->regmap, AXP20X_PWR_INPUT_STATUS, &val);
 343         if (ret < 0)
 344                 return ret;
 345
 346         if (val & PS_STAT_VBUS_VALID)
 347                 online = 1;
 348         return online;
 349 }
 350
 351 static int axp288_get_charger_health(struct axp288_chrg_info *info)
 352 {
 353         int ret, pwr_stat, chrg_stat;
 354         int health = POWER_SUPPLY_HEALTH_UNKNOWN;
 355         unsigned int val;
 356
 357         ret = regmap_read(info->regmap, AXP20X_PWR_INPUT_STATUS, &val);
 358         if ((ret < 0) || !(val & PS_STAT_VBUS_PRESENT))
 359                 goto health_read_fail;
 360         else
 361                 pwr_stat = val;
 362
 363         ret = regmap_read(info->regmap, AXP20X_PWR_OP_MODE, &val);
 364         if (ret < 0)
 365                 goto health_read_fail;
 366         else
 367                 chrg_stat = val;
 368
 369         if (!(pwr_stat & PS_STAT_VBUS_VALID))
 370                 health = POWER_SUPPLY_HEALTH_DEAD;
 371         else if (chrg_stat & CHRG_STAT_PMIC_OTP)
 372                 health = POWER_SUPPLY_HEALTH_OVERHEAT;
 373         else if (chrg_stat & CHRG_STAT_BAT_SAFE_MODE)
 374                 health = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
 375         else
 376                 health = POWER_SUPPLY_HEALTH_GOOD;
 377
 378 health_read_fail:
 379         return health;
 380 }
 381
 382 static int axp288_charger_usb_set_property(struct power_supply *psy,
 383                                     enum power_supply_property psp,
 384                                     const union power_supply_propval *val)
 385 {
 386         struct axp288_chrg_info *info = power_supply_get_drvdata(psy);
 387         int ret = 0;
 388         int scaled_val;
 389
 390         mutex_lock(&info->lock);
 391
 392         switch (psp) {
 393         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 394                 scaled_val = min(val->intval, info->max_cc);
 395                 scaled_val = DIV_ROUND_CLOSEST(scaled_val, 1000);
 396                 ret = axp288_charger_set_cc(info, scaled_val);
 397                 if (ret < 0)
 398                         dev_warn(&info->pdev->dev, "set charge current failed\n");
 399                 break;
 400         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 401                 scaled_val = min(val->intval, info->max_cv);
 402                 scaled_val = DIV_ROUND_CLOSEST(scaled_val, 1000);
 403                 ret = axp288_charger_set_cv(info, scaled_val);
 404                 if (ret < 0)
 405                         dev_warn(&info->pdev->dev, "set charge voltage failed\n");
 406                 break;
 407         default:
 408                 ret = -EINVAL;
 409         }
 410
 411         mutex_unlock(&info->lock);
 412         return ret;
 413 }
 414
 415 static int axp288_charger_usb_get_property(struct power_supply *psy,
 416                                     enum power_supply_property psp,
 417                                     union power_supply_propval *val)
 418 {
 419         struct axp288_chrg_info *info = power_supply_get_drvdata(psy);
 420         int ret = 0;
 421
 422         mutex_lock(&info->lock);
 423
 424         switch (psp) {
 425         case POWER_SUPPLY_PROP_PRESENT:
 426                 /* Check for OTG case first */
 427                 if (info->otg.id_short) {
 428                         val->intval = 0;
 429                         break;
 430                 }
 431                 ret = axp288_charger_is_present(info);
 432                 if (ret < 0)
 433                         goto psy_get_prop_fail;
 434                 info->present = ret;
 435                 val->intval = info->present;
 436                 break;
 437         case POWER_SUPPLY_PROP_ONLINE:
 438                 /* Check for OTG case first */
 439                 if (info->otg.id_short) {
 440                         val->intval = 0;
 441                         break;
 442                 }
 443                 ret = axp288_charger_is_online(info);
 444                 if (ret < 0)
 445                         goto psy_get_prop_fail;
 446                 info->online = ret;
 447                 val->intval = info->online;
 448                 break;
 449         case POWER_SUPPLY_PROP_HEALTH:
 450                 val->intval = axp288_get_charger_health(info);
 451                 break;
 452         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 453                 val->intval = info->cc * 1000;
 454                 break;
 455         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 456                 val->intval = info->max_cc * 1000;
 457                 break;
 458         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 459                 val->intval = info->cv * 1000;
 460                 break;
 461         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 462                 val->intval = info->max_cv * 1000;
 463                 break;
 464         case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
 465                 val->intval = info->inlmt * 1000;
 466                 break;
 467         default:
 468                 ret = -EINVAL;
 469                 goto psy_get_prop_fail;
 470         }
 471
 472 psy_get_prop_fail:
 473         mutex_unlock(&info->lock);
 474         return ret;
 475 }
 476
 477 static int axp288_charger_property_is_writeable(struct power_supply *psy,
 478                 enum power_supply_property psp)
 479 {
 480         int ret;
 481
 482         switch (psp) {
 483         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 484         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 485                 ret = 1;
 486                 break;
 487         default:
 488                 ret = 0;
 489         }
 490
 491         return ret;
 492 }
 493
 494 static enum power_supply_property axp288_usb_props[] = {
 495         POWER_SUPPLY_PROP_PRESENT,
 496         POWER_SUPPLY_PROP_ONLINE,
 497         POWER_SUPPLY_PROP_TYPE,
 498         POWER_SUPPLY_PROP_HEALTH,
 499         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
 500         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 501         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 502         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 503         POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT,
 504 };
 505
 506 static const struct power_supply_desc axp288_charger_desc = {
 507         .name                   = "axp288_charger",
 508         .type                   = POWER_SUPPLY_TYPE_USB,
 509         .properties             = axp288_usb_props,
 510         .num_properties         = ARRAY_SIZE(axp288_usb_props),
 511         .get_property           = axp288_charger_usb_get_property,
 512         .set_property           = axp288_charger_usb_set_property,
 513         .property_is_writeable  = axp288_charger_property_is_writeable,
 514 };
 515
 516 static irqreturn_t axp288_charger_irq_thread_handler(int irq, void *dev)
 517 {
 518         struct axp288_chrg_info *info = dev;
 519         int i;
 520
 521         for (i = 0; i < CHRG_INTR_END; i++) {
 522                 if (info->irq[i] == irq)
 523                         break;
 524         }
 525
 526         if (i >= CHRG_INTR_END) {
 527                 dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
 528                 return IRQ_NONE;
 529         }
 530
 531         switch (i) {
 532         case VBUS_OV_IRQ:
 533                 dev_dbg(&info->pdev->dev, "VBUS Over Voltage INTR\n");
 534                 break;
 535         case CHARGE_DONE_IRQ:
 536                 dev_dbg(&info->pdev->dev, "Charging Done INTR\n");
 537                 break;
 538         case CHARGE_CHARGING_IRQ:
 539                 dev_dbg(&info->pdev->dev, "Start Charging IRQ\n");
 540                 break;
 541         case BAT_SAFE_QUIT_IRQ:
 542                 dev_dbg(&info->pdev->dev,
 543                         "Quit Safe Mode(restart timer) Charging IRQ\n");
 544                 break;
 545         case BAT_SAFE_ENTER_IRQ:
 546                 dev_dbg(&info->pdev->dev,
 547                         "Enter Safe Mode(timer expire) Charging IRQ\n");
 548                 break;
 549         case QCBTU_IRQ:
 550                 dev_dbg(&info->pdev->dev,
 551                         "Quit Battery Under Temperature(CHRG) INTR\n");
 552                 break;
 553         case CBTU_IRQ:
 554                 dev_dbg(&info->pdev->dev,
 555                         "Hit Battery Under Temperature(CHRG) INTR\n");
 556                 break;
 557         case QCBTO_IRQ:
 558                 dev_dbg(&info->pdev->dev,
 559                         "Quit Battery Over Temperature(CHRG) INTR\n");
 560                 break;
 561         case CBTO_IRQ:
 562                 dev_dbg(&info->pdev->dev,
 563                         "Hit Battery Over Temperature(CHRG) INTR\n");
 564                 break;
 565         default:
 566                 dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
 567                 goto out;
 568         }
 569
 570         power_supply_changed(info->psy_usb);
 571 out:
 572         return IRQ_HANDLED;
 573 }
 574
 575 static void axp288_charger_extcon_evt_worker(struct work_struct *work)
 576 {
 577         struct axp288_chrg_info *info =
 578             container_of(work, struct axp288_chrg_info, cable.work);
 579         int ret, current_limit;
 580         bool changed = false;
 581         struct extcon_dev *edev = info->cable.edev;
 582         bool old_connected = info->cable.connected;
 583
 584         /* Determine cable/charger type */
 585         if (extcon_get_cable_state_(edev, EXTCON_CHG_USB_SDP) > 0) {
 586                 dev_dbg(&info->pdev->dev, "USB SDP charger  is connected");
 587                 info->cable.connected = true;
 588                 info->cable.chg_type = POWER_SUPPLY_TYPE_USB;
 589         } else if (extcon_get_cable_state_(edev, EXTCON_CHG_USB_CDP) > 0) {
 590                 dev_dbg(&info->pdev->dev, "USB CDP charger is connected");
 591                 info->cable.connected = true;
 592                 info->cable.chg_type = POWER_SUPPLY_TYPE_USB_CDP;
 593         } else if (extcon_get_cable_state_(edev, EXTCON_CHG_USB_DCP) > 0) {
 594                 dev_dbg(&info->pdev->dev, "USB DCP charger is connected");
 595                 info->cable.connected = true;
 596                 info->cable.chg_type = POWER_SUPPLY_TYPE_USB_DCP;
 597         } else {
 598                 if (old_connected)
 599                         dev_dbg(&info->pdev->dev, "USB charger disconnected");
 600                 info->cable.connected = false;
 601                 info->cable.chg_type = POWER_SUPPLY_TYPE_USB;
 602         }
 603
 604         /* Cable status changed */
 605         if (old_connected != info->cable.connected)
 606                 changed = true;
 607
 608         if (!changed)
 609                 return;
 610
 611         mutex_lock(&info->lock);
 612
 613         if (info->is_charger_enabled && !info->cable.connected) {
 614                 info->enable_charger = false;
 615                 ret = axp288_charger_enable_charger(info, info->enable_charger);
 616                 if (ret < 0)
 617                         dev_err(&info->pdev->dev,
 618                                 "cannot disable charger (%d)", ret);
 619
 620         } else if (!info->is_charger_enabled && info->cable.connected) {
 621                 switch (info->cable.chg_type) {
 622                 case POWER_SUPPLY_TYPE_USB:
 623                         current_limit = ILIM_500MA;
 624                         break;
 625                 case POWER_SUPPLY_TYPE_USB_CDP:
 626                         current_limit = ILIM_1500MA;
 627                         break;
 628                 case POWER_SUPPLY_TYPE_USB_DCP:
 629                         current_limit = ILIM_2000MA;
 630                         break;
 631                 default:
 632                         /* Unknown */
 633                         current_limit = 0;
 634                         break;
 635                 }
 636
 637                 /* Set vbus current limit first, then enable charger */
 638                 ret = axp288_charger_set_vbus_inlmt(info, current_limit);
 639                 if (ret < 0) {
 640                         dev_err(&info->pdev->dev,
 641                                 "error setting current limit (%d)", ret);
 642                 } else {
 643                         info->enable_charger = (current_limit > 0);
 644                         ret = axp288_charger_enable_charger(info,
 645                                                         info->enable_charger);
 646                         if (ret < 0)
 647                                 dev_err(&info->pdev->dev,
 648                                         "cannot enable charger (%d)", ret);
 649                 }
 650         }
 651
 652         if (changed)
 653                 info->health = axp288_get_charger_health(info);
 654
 655         mutex_unlock(&info->lock);
 656
 657         if (changed)
 658                 power_supply_changed(info->psy_usb);
 659 }
 660
 661 static int axp288_charger_handle_cable_evt(struct notifier_block *nb,
 662                                           unsigned long event, void *param)
 663 {
 664         struct axp288_chrg_info *info =
 665             container_of(nb, struct axp288_chrg_info, cable.nb);
 666
 667         schedule_work(&info->cable.work);
 668
 669         return NOTIFY_OK;
 670 }
 671
 672 static void axp288_charger_otg_evt_worker(struct work_struct *work)
 673 {
 674         struct axp288_chrg_info *info =
 675             container_of(work, struct axp288_chrg_info, otg.work);
 676         int ret;
 677
 678         /* Disable VBUS path before enabling the 5V boost */
 679         ret = axp288_charger_vbus_path_select(info, !info->otg.id_short);
 680         if (ret < 0)
 681                 dev_warn(&info->pdev->dev, "vbus path disable failed\n");
 682 }
 683
 684 static int axp288_charger_handle_otg_evt(struct notifier_block *nb,
 685                                    unsigned long event, void *param)
 686 {
 687         struct axp288_chrg_info *info =
 688             container_of(nb, struct axp288_chrg_info, otg.id_nb);
 689         struct extcon_dev *edev = info->otg.cable;
 690         int usb_host = extcon_get_cable_state_(edev, EXTCON_USB_HOST);
 691
 692         dev_dbg(&info->pdev->dev, "external connector USB-Host is %s\n",
 693                                 usb_host ? "attached" : "detached");
 694
 695         /*
 696          * Set usb_id_short flag to avoid running charger detection logic
 697          * in case usb host.
 698          */
 699         info->otg.id_short = usb_host;
 700         schedule_work(&info->otg.work);
 701
 702         return NOTIFY_OK;
 703 }
 704
 705 static void charger_init_hw_regs(struct axp288_chrg_info *info)
 706 {
 707         int ret, cc, cv;
 708         unsigned int val;
 709
 710         /* Program temperature thresholds */
 711         ret = regmap_write(info->regmap, AXP20X_V_LTF_CHRG, CHRG_VLTFC_0C);
 712         if (ret < 0)
 713                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 714                                                         AXP20X_V_LTF_CHRG, ret);
 715
 716         ret = regmap_write(info->regmap, AXP20X_V_HTF_CHRG, CHRG_VHTFC_45C);
 717         if (ret < 0)
 718                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 719                                                         AXP20X_V_HTF_CHRG, ret);
 720
 721         /* Do not turn-off charger o/p after charge cycle ends */
 722         ret = regmap_update_bits(info->regmap,
 723                                 AXP20X_CHRG_CTRL2,
 724                                 CNTL2_CHG_OUT_TURNON, 1);
 725         if (ret < 0)
 726                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 727                                                 AXP20X_CHRG_CTRL2, ret);
 728
 729         /* Enable interrupts */
 730         ret = regmap_update_bits(info->regmap,
 731                                 AXP20X_IRQ2_EN,
 732                                 BAT_IRQ_CFG_BAT_MASK, 1);
 733         if (ret < 0)
 734                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 735                                                 AXP20X_IRQ2_EN, ret);
 736
 737         ret = regmap_update_bits(info->regmap, AXP20X_IRQ3_EN,
 738                                 TEMP_IRQ_CFG_MASK, 1);
 739         if (ret < 0)
 740                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 741                                                 AXP20X_IRQ3_EN, ret);
 742
 743         /* Setup ending condition for charging to be 10% of I(chrg) */
 744         ret = regmap_update_bits(info->regmap,
 745                                 AXP20X_CHRG_CTRL1,
 746                                 CHRG_CCCV_ITERM_20P, 0);
 747         if (ret < 0)
 748                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 749                                                 AXP20X_CHRG_CTRL1, ret);
 750
 751         /* Disable OCV-SOC curve calibration */
 752         ret = regmap_update_bits(info->regmap,
 753                                 AXP20X_CC_CTRL,
 754                                 FG_CNTL_OCV_ADJ_EN, 0);
 755         if (ret < 0)
 756                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 757                                                 AXP20X_CC_CTRL, ret);
 758
 759         /* Init charging current and voltage */
 760         info->max_cc = info->pdata->max_cc;
 761         info->max_cv = info->pdata->max_cv;
 762
 763         /* Read current charge voltage and current limit */
 764         ret = regmap_read(info->regmap, AXP20X_CHRG_CTRL1, &val);
 765         if (ret < 0) {
 766                 /* Assume default if cannot read */
 767                 info->cc = info->pdata->def_cc;
 768                 info->cv = info->pdata->def_cv;
 769         } else {
 770                 /* Determine charge voltage */
 771                 cv = (val & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS;
 772                 switch (cv) {
 773                 case CHRG_CCCV_CV_4100MV:
 774                         info->cv = CV_4100MV;
 775                         break;
 776                 case CHRG_CCCV_CV_4150MV:
 777                         info->cv = CV_4150MV;
 778                         break;
 779                 case CHRG_CCCV_CV_4200MV:
 780                         info->cv = CV_4200MV;
 781                         break;
 782                 case CHRG_CCCV_CV_4350MV:
 783                         info->cv = CV_4350MV;
 784                         break;
 785                 default:
 786                         info->cv = INT_MAX;
 787                         break;
 788                 }
 789
 790                 /* Determine charge current limit */
 791                 cc = (ret & CHRG_CCCV_CC_MASK) >> CHRG_CCCV_CC_BIT_POS;
 792                 cc = (cc * CHRG_CCCV_CC_LSB_RES) + CHRG_CCCV_CC_OFFSET;
 793                 info->cc = cc;
 794
 795                 /* Program default charging voltage and current */
 796                 cc = min(info->pdata->def_cc, info->max_cc);
 797                 cv = min(info->pdata->def_cv, info->max_cv);
 798
 799                 ret = axp288_charger_set_cc(info, cc);
 800                 if (ret < 0)
 801                         dev_warn(&info->pdev->dev,
 802                                         "error(%d) in setting CC\n", ret);
 803
 804                 ret = axp288_charger_set_cv(info, cv);
 805                 if (ret < 0)
 806                         dev_warn(&info->pdev->dev,
 807                                         "error(%d) in setting CV\n", ret);
 808         }
 809 }
 810
 811 static int axp288_charger_probe(struct platform_device *pdev)
 812 {
 813         int ret, i, pirq;
 814         struct axp288_chrg_info *info;
 815         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 816         struct power_supply_config charger_cfg = {};
 817
 818         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 819         if (!info)
 820                 return -ENOMEM;
 821
 822         info->pdev = pdev;
 823         info->regmap = axp20x->regmap;
 824         info->regmap_irqc = axp20x->regmap_irqc;
 825         info->pdata = pdev->dev.platform_data;
 826
 827         if (!info->pdata) {
 828                 /* Try ACPI provided pdata via device properties */
 829                 if (!device_property_present(&pdev->dev,
 830                                                 "axp288_charger_data\n"))
 831                         dev_err(&pdev->dev, "failed to get platform data\n");
 832                 return -ENODEV;
 833         }
 834
 835         info->cable.edev = extcon_get_extcon_dev(AXP288_EXTCON_DEV_NAME);
 836         if (info->cable.edev == NULL) {
 837                 dev_dbg(&pdev->dev, "%s is not ready, probe deferred\n",
 838                         AXP288_EXTCON_DEV_NAME);
 839                 return -EPROBE_DEFER;
 840         }
 841
 842         /* Register for extcon notification */
 843         INIT_WORK(&info->cable.work, axp288_charger_extcon_evt_worker);
 844         info->cable.nb.notifier_call = axp288_charger_handle_cable_evt;
 845         ret = extcon_register_notifier(info->cable.edev, EXTCON_CHG_USB_SDP,
 846                                         &info->cable.nb);
 847         if (ret) {
 848                 dev_err(&info->pdev->dev,
 849                         "failed to register extcon notifier for SDP %d\n", ret);
 850                 return ret;
 851         }
 852
 853         ret = extcon_register_notifier(info->cable.edev, EXTCON_CHG_USB_CDP,
 854                                         &info->cable.nb);
 855         if (ret) {
 856                 dev_err(&info->pdev->dev,
 857                         "failed to register extcon notifier for CDP %d\n", ret);
 858                 extcon_unregister_notifier(info->cable.edev,
 859                                 EXTCON_CHG_USB_SDP, &info->cable.nb);
 860                 return ret;
 861         }
 862
 863         ret = extcon_register_notifier(info->cable.edev, EXTCON_CHG_USB_DCP,
 864                                         &info->cable.nb);
 865         if (ret) {
 866                 dev_err(&info->pdev->dev,
 867                         "failed to register extcon notifier for DCP %d\n", ret);
 868                 extcon_unregister_notifier(info->cable.edev,
 869                                 EXTCON_CHG_USB_SDP, &info->cable.nb);
 870                 extcon_unregister_notifier(info->cable.edev,
 871                                 EXTCON_CHG_USB_CDP, &info->cable.nb);
 872                 return ret;
 873         }
 874
 875         platform_set_drvdata(pdev, info);
 876         mutex_init(&info->lock);
 877
 878         /* Register with power supply class */
 879         charger_cfg.drv_data = info;
 880         info->psy_usb = power_supply_register(&pdev->dev, &axp288_charger_desc,
 881                                                 &charger_cfg);
 882         if (IS_ERR(info->psy_usb)) {
 883                 dev_err(&pdev->dev, "failed to register power supply charger\n");
 884                 ret = PTR_ERR(info->psy_usb);
 885                 goto psy_reg_failed;
 886         }
 887
 888         /* Register for OTG notification */
 889         INIT_WORK(&info->otg.work, axp288_charger_otg_evt_worker);
 890         info->otg.id_nb.notifier_call = axp288_charger_handle_otg_evt;
 891         ret = extcon_register_notifier(info->otg.cable, EXTCON_USB_HOST,
 892                                        &info->otg.id_nb);
 893         if (ret)
 894                 dev_warn(&pdev->dev, "failed to register otg notifier\n");
 895
 896         if (info->otg.cable)
 897                 info->otg.id_short = extcon_get_cable_state_(
 898                                         info->otg.cable, EXTCON_USB_HOST);
 899
 900         /* Register charger interrupts */
 901         for (i = 0; i < CHRG_INTR_END; i++) {
 902                 pirq = platform_get_irq(info->pdev, i);
 903                 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
 904                 if (info->irq[i] < 0) {
 905                         dev_warn(&info->pdev->dev,
 906                                 "failed to get virtual interrupt=%d\n", pirq);
 907                         ret = info->irq[i];
 908                         goto intr_reg_failed;
 909                 }
 910                 ret = devm_request_threaded_irq(&info->pdev->dev, info->irq[i],
 911                                         NULL, axp288_charger_irq_thread_handler,
 912                                         IRQF_ONESHOT, info->pdev->name, info);
 913                 if (ret) {
 914                         dev_err(&pdev->dev, "failed to request interrupt=%d\n",
 915                                                                 info->irq[i]);
 916                         goto intr_reg_failed;
 917                 }
 918         }
 919
 920         charger_init_hw_regs(info);
 921
 922         return 0;
 923
 924 intr_reg_failed:
 925         if (info->otg.cable)
 926                 extcon_unregister_notifier(info->otg.cable, EXTCON_USB_HOST,
 927                                         &info->otg.id_nb);
 928         power_supply_unregister(info->psy_usb);
 929 psy_reg_failed:
 930         extcon_unregister_notifier(info->cable.edev, EXTCON_CHG_USB_SDP,
 931                                         &info->cable.nb);
 932         extcon_unregister_notifier(info->cable.edev, EXTCON_CHG_USB_CDP,
 933                                         &info->cable.nb);
 934         extcon_unregister_notifier(info->cable.edev, EXTCON_CHG_USB_DCP,
 935                                         &info->cable.nb);
 936         return ret;
 937 }
 938
 939 static int axp288_charger_remove(struct platform_device *pdev)
 940 {
 941         struct axp288_chrg_info *info =  dev_get_drvdata(&pdev->dev);
 942
 943         if (info->otg.cable)
 944                 extcon_unregister_notifier(info->otg.cable, EXTCON_USB_HOST,
 945                                         &info->otg.id_nb);
 946
 947         extcon_unregister_notifier(info->cable.edev, EXTCON_CHG_USB_SDP,
 948                                         &info->cable.nb);
 949         extcon_unregister_notifier(info->cable.edev, EXTCON_CHG_USB_CDP,
 950                                         &info->cable.nb);
 951         extcon_unregister_notifier(info->cable.edev, EXTCON_CHG_USB_DCP,
 952                                         &info->cable.nb);
 953         power_supply_unregister(info->psy_usb);
 954
 955         return 0;
 956 }
 957
 958 static struct platform_driver axp288_charger_driver = {
 959         .probe = axp288_charger_probe,
 960         .remove = axp288_charger_remove,
 961         .driver = {
 962                 .name = "axp288_charger",
 963         },
 964 };
 965
 966 module_platform_driver(axp288_charger_driver);
 967
 968 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
 969 MODULE_DESCRIPTION("X-power AXP288 Charger Driver");
 970 MODULE_LICENSE("GPL v2");