drivers/power/pm2301_charger.c

   1 /*
   2  * Copyright 2012 ST Ericsson.
   3  *
   4  * Power supply driver for ST Ericsson pm2xxx_charger charger
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/device.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/delay.h>
  16 #include <linux/slab.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/power_supply.h>
  19 #include <linux/regulator/consumer.h>
  20 #include <linux/err.h>
  21 #include <linux/i2c.h>
  22 #include <linux/workqueue.h>
  23 #include <linux/mfd/abx500/ab8500.h>
  24 #include <linux/mfd/abx500/ab8500-bm.h>
  25 #include <linux/mfd/abx500/ux500_chargalg.h>
  26 #include <linux/pm2301_charger.h>
  27 #include <linux/gpio.h>
  28 #include <linux/pm_runtime.h>
  29 #include <linux/pm.h>
  30
  31 #include "pm2301_charger.h"
  32
  33 #define to_pm2xxx_charger_ac_device_info(x) container_of((x), \
  34                 struct pm2xxx_charger, ac_chg)
  35 #define SLEEP_MIN               50
  36 #define SLEEP_MAX               100
  37 #define PM2XXX_AUTOSUSPEND_DELAY 500
  38
  39 static int pm2xxx_interrupt_registers[] = {
  40         PM2XXX_REG_INT1,
  41         PM2XXX_REG_INT2,
  42         PM2XXX_REG_INT3,
  43         PM2XXX_REG_INT4,
  44         PM2XXX_REG_INT5,
  45         PM2XXX_REG_INT6,
  46 };
  47
  48 static enum power_supply_property pm2xxx_charger_ac_props[] = {
  49         POWER_SUPPLY_PROP_HEALTH,
  50         POWER_SUPPLY_PROP_PRESENT,
  51         POWER_SUPPLY_PROP_ONLINE,
  52         POWER_SUPPLY_PROP_VOLTAGE_AVG,
  53 };
  54
  55 static int pm2xxx_charger_voltage_map[] = {
  56         3500,
  57         3525,
  58         3550,
  59         3575,
  60         3600,
  61         3625,
  62         3650,
  63         3675,
  64         3700,
  65         3725,
  66         3750,
  67         3775,
  68         3800,
  69         3825,
  70         3850,
  71         3875,
  72         3900,
  73         3925,
  74         3950,
  75         3975,
  76         4000,
  77         4025,
  78         4050,
  79         4075,
  80         4100,
  81         4125,
  82         4150,
  83         4175,
  84         4200,
  85         4225,
  86         4250,
  87         4275,
  88         4300,
  89 };
  90
  91 static int pm2xxx_charger_current_map[] = {
  92         200,
  93         200,
  94         400,
  95         600,
  96         800,
  97         1000,
  98         1200,
  99         1400,
 100         1600,
 101         1800,
 102         2000,
 103         2200,
 104         2400,
 105         2600,
 106         2800,
 107         3000,
 108 };
 109
 110 static const struct i2c_device_id pm2xxx_ident[] = {
 111         { "pm2301", 0 },
 112         { }
 113 };
 114
 115 static void set_lpn_pin(struct pm2xxx_charger *pm2)
 116 {
 117         if (!pm2->ac.charger_connected && gpio_is_valid(pm2->lpn_pin)) {
 118                 gpio_set_value(pm2->lpn_pin, 1);
 119                 usleep_range(SLEEP_MIN, SLEEP_MAX);
 120         }
 121 }
 122
 123 static void clear_lpn_pin(struct pm2xxx_charger *pm2)
 124 {
 125         if (!pm2->ac.charger_connected && gpio_is_valid(pm2->lpn_pin))
 126                 gpio_set_value(pm2->lpn_pin, 0);
 127 }
 128
 129 static int pm2xxx_reg_read(struct pm2xxx_charger *pm2, int reg, u8 *val)
 130 {
 131         int ret;
 132
 133         /* wake up the device */
 134         pm_runtime_get_sync(pm2->dev);
 135
 136         ret = i2c_smbus_read_i2c_block_data(pm2->config.pm2xxx_i2c, reg,
 137                                 1, val);
 138         if (ret < 0)
 139                 dev_err(pm2->dev, "Error reading register at 0x%x\n", reg);
 140         else
 141                 ret = 0;
 142
 143         pm_runtime_put_sync(pm2->dev);
 144
 145         return ret;
 146 }
 147
 148 static int pm2xxx_reg_write(struct pm2xxx_charger *pm2, int reg, u8 val)
 149 {
 150         int ret;
 151
 152         /* wake up the device */
 153         pm_runtime_get_sync(pm2->dev);
 154
 155         ret = i2c_smbus_write_i2c_block_data(pm2->config.pm2xxx_i2c, reg,
 156                                 1, &val);
 157         if (ret < 0)
 158                 dev_err(pm2->dev, "Error writing register at 0x%x\n", reg);
 159         else
 160                 ret = 0;
 161
 162         pm_runtime_put_sync(pm2->dev);
 163
 164         return ret;
 165 }
 166
 167 static int pm2xxx_charging_enable_mngt(struct pm2xxx_charger *pm2)
 168 {
 169         int ret;
 170
 171         /* Enable charging */
 172         ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG2,
 173                         (PM2XXX_CH_AUTO_RESUME_EN | PM2XXX_CHARGER_ENA));
 174
 175         return ret;
 176 }
 177
 178 static int pm2xxx_charging_disable_mngt(struct pm2xxx_charger *pm2)
 179 {
 180         int ret;
 181
 182         /* Disable SW EOC ctrl */
 183         ret = pm2xxx_reg_write(pm2, PM2XXX_SW_CTRL_REG, PM2XXX_SWCTRL_HW);
 184         if (ret < 0) {
 185                 dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
 186                 return ret;
 187         }
 188
 189         /* Disable charging */
 190         ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG2,
 191                         (PM2XXX_CH_AUTO_RESUME_DIS | PM2XXX_CHARGER_DIS));
 192         if (ret < 0) {
 193                 dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
 194                 return ret;
 195         }
 196
 197         return 0;
 198 }
 199
 200 static int pm2xxx_charger_batt_therm_mngt(struct pm2xxx_charger *pm2, int val)
 201 {
 202         queue_work(pm2->charger_wq, &pm2->check_main_thermal_prot_work);
 203
 204         return 0;
 205 }
 206
 207
 208 static int pm2xxx_charger_die_therm_mngt(struct pm2xxx_charger *pm2, int val)
 209 {
 210         queue_work(pm2->charger_wq, &pm2->check_main_thermal_prot_work);
 211
 212         return 0;
 213 }
 214
 215 static int pm2xxx_charger_ovv_mngt(struct pm2xxx_charger *pm2, int val)
 216 {
 217         dev_err(pm2->dev, "Overvoltage detected\n");
 218         pm2->flags.ovv = true;
 219         power_supply_changed(pm2->ac_chg.psy);
 220
 221         /* Schedule a new HW failure check */
 222         queue_delayed_work(pm2->charger_wq, &pm2->check_hw_failure_work, 0);
 223
 224         return 0;
 225 }
 226
 227 static int pm2xxx_charger_wd_exp_mngt(struct pm2xxx_charger *pm2, int val)
 228 {
 229         dev_dbg(pm2->dev , "20 minutes watchdog expired\n");
 230
 231         pm2->ac.wd_expired = true;
 232         power_supply_changed(pm2->ac_chg.psy);
 233
 234         return 0;
 235 }
 236
 237 static int pm2xxx_charger_vbat_lsig_mngt(struct pm2xxx_charger *pm2, int val)
 238 {
 239         int ret;
 240
 241         switch (val) {
 242         case PM2XXX_INT1_ITVBATLOWR:
 243                 dev_dbg(pm2->dev, "VBAT grows above VBAT_LOW level\n");
 244                 /* Enable SW EOC ctrl */
 245                 ret = pm2xxx_reg_write(pm2, PM2XXX_SW_CTRL_REG,
 246                                                         PM2XXX_SWCTRL_SW);
 247                 if (ret < 0) {
 248                         dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
 249                         return ret;
 250                 }
 251                 break;
 252
 253         case PM2XXX_INT1_ITVBATLOWF:
 254                 dev_dbg(pm2->dev, "VBAT drops below VBAT_LOW level\n");
 255                 /* Disable SW EOC ctrl */
 256                 ret = pm2xxx_reg_write(pm2, PM2XXX_SW_CTRL_REG,
 257                                                         PM2XXX_SWCTRL_HW);
 258                 if (ret < 0) {
 259                         dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
 260                         return ret;
 261                 }
 262                 break;
 263
 264         default:
 265                 dev_err(pm2->dev, "Unknown VBAT level\n");
 266         }
 267
 268         return 0;
 269 }
 270
 271 static int pm2xxx_charger_bat_disc_mngt(struct pm2xxx_charger *pm2, int val)
 272 {
 273         dev_dbg(pm2->dev, "battery disconnected\n");
 274
 275         return 0;
 276 }
 277
 278 static int pm2xxx_charger_detection(struct pm2xxx_charger *pm2, u8 *val)
 279 {
 280         int ret;
 281
 282         ret = pm2xxx_reg_read(pm2, PM2XXX_SRCE_REG_INT2, val);
 283
 284         if (ret < 0) {
 285                 dev_err(pm2->dev, "Charger detection failed\n");
 286                 goto out;
 287         }
 288
 289         *val &= (PM2XXX_INT2_S_ITVPWR1PLUG | PM2XXX_INT2_S_ITVPWR2PLUG);
 290
 291 out:
 292         return ret;
 293 }
 294
 295 static int pm2xxx_charger_itv_pwr_plug_mngt(struct pm2xxx_charger *pm2, int val)
 296 {
 297
 298         int ret;
 299         u8 read_val;
 300
 301         /*
 302          * Since we can't be sure that the events are received
 303          * synchronously, we have the check if the main charger is
 304          * connected by reading the interrupt source register.
 305          */
 306         ret = pm2xxx_charger_detection(pm2, &read_val);
 307
 308         if ((ret == 0) && read_val) {
 309                 pm2->ac.charger_connected = 1;
 310                 pm2->ac_conn = true;
 311                 queue_work(pm2->charger_wq, &pm2->ac_work);
 312         }
 313
 314
 315         return ret;
 316 }
 317
 318 static int pm2xxx_charger_itv_pwr_unplug_mngt(struct pm2xxx_charger *pm2,
 319                                                                 int val)
 320 {
 321         pm2->ac.charger_connected = 0;
 322         queue_work(pm2->charger_wq, &pm2->ac_work);
 323
 324         return 0;
 325 }
 326
 327 static int pm2_int_reg0(void *pm2_data, int val)
 328 {
 329         struct pm2xxx_charger *pm2 = pm2_data;
 330         int ret = 0;
 331
 332         if (val & PM2XXX_INT1_ITVBATLOWR) {
 333                 ret = pm2xxx_charger_vbat_lsig_mngt(pm2,
 334                                                 PM2XXX_INT1_ITVBATLOWR);
 335                 if (ret < 0)
 336                         goto out;
 337         }
 338
 339         if (val & PM2XXX_INT1_ITVBATLOWF) {
 340                 ret = pm2xxx_charger_vbat_lsig_mngt(pm2,
 341                                                 PM2XXX_INT1_ITVBATLOWF);
 342                 if (ret < 0)
 343                         goto out;
 344         }
 345
 346         if (val & PM2XXX_INT1_ITVBATDISCONNECT) {
 347                 ret = pm2xxx_charger_bat_disc_mngt(pm2,
 348                                 PM2XXX_INT1_ITVBATDISCONNECT);
 349                 if (ret < 0)
 350                         goto out;
 351         }
 352 out:
 353         return ret;
 354 }
 355
 356 static int pm2_int_reg1(void *pm2_data, int val)
 357 {
 358         struct pm2xxx_charger *pm2 = pm2_data;
 359         int ret = 0;
 360
 361         if (val & (PM2XXX_INT2_ITVPWR1PLUG | PM2XXX_INT2_ITVPWR2PLUG)) {
 362                 dev_dbg(pm2->dev , "Main charger plugged\n");
 363                 ret = pm2xxx_charger_itv_pwr_plug_mngt(pm2, val &
 364                         (PM2XXX_INT2_ITVPWR1PLUG | PM2XXX_INT2_ITVPWR2PLUG));
 365         }
 366
 367         if (val &
 368                 (PM2XXX_INT2_ITVPWR1UNPLUG | PM2XXX_INT2_ITVPWR2UNPLUG)) {
 369                 dev_dbg(pm2->dev , "Main charger unplugged\n");
 370                 ret = pm2xxx_charger_itv_pwr_unplug_mngt(pm2, val &
 371                                                 (PM2XXX_INT2_ITVPWR1UNPLUG |
 372                                                 PM2XXX_INT2_ITVPWR2UNPLUG));
 373         }
 374
 375         return ret;
 376 }
 377
 378 static int pm2_int_reg2(void *pm2_data, int val)
 379 {
 380         struct pm2xxx_charger *pm2 = pm2_data;
 381         int ret = 0;
 382
 383         if (val & PM2XXX_INT3_ITAUTOTIMEOUTWD)
 384                 ret = pm2xxx_charger_wd_exp_mngt(pm2, val);
 385
 386         if (val & (PM2XXX_INT3_ITCHPRECHARGEWD |
 387                                 PM2XXX_INT3_ITCHCCWD | PM2XXX_INT3_ITCHCVWD)) {
 388                 dev_dbg(pm2->dev,
 389                         "Watchdog occurred for precharge, CC and CV charge\n");
 390         }
 391
 392         return ret;
 393 }
 394
 395 static int pm2_int_reg3(void *pm2_data, int val)
 396 {
 397         struct pm2xxx_charger *pm2 = pm2_data;
 398         int ret = 0;
 399
 400         if (val & (PM2XXX_INT4_ITCHARGINGON)) {
 401                 dev_dbg(pm2->dev ,
 402                         "chargind operation has started\n");
 403         }
 404
 405         if (val & (PM2XXX_INT4_ITVRESUME)) {
 406                 dev_dbg(pm2->dev,
 407                         "battery discharged down to VResume threshold\n");
 408         }
 409
 410         if (val & (PM2XXX_INT4_ITBATTFULL)) {
 411                 dev_dbg(pm2->dev , "battery fully detected\n");
 412         }
 413
 414         if (val & (PM2XXX_INT4_ITCVPHASE)) {
 415                 dev_dbg(pm2->dev, "CV phase enter with 0.5C charging\n");
 416         }
 417
 418         if (val & (PM2XXX_INT4_ITVPWR2OVV | PM2XXX_INT4_ITVPWR1OVV)) {
 419                 pm2->failure_case = VPWR_OVV;
 420                 ret = pm2xxx_charger_ovv_mngt(pm2, val &
 421                         (PM2XXX_INT4_ITVPWR2OVV | PM2XXX_INT4_ITVPWR1OVV));
 422                 dev_dbg(pm2->dev, "VPWR/VSYSTEM overvoltage detected\n");
 423         }
 424
 425         if (val & (PM2XXX_INT4_S_ITBATTEMPCOLD |
 426                                 PM2XXX_INT4_S_ITBATTEMPHOT)) {
 427                 ret = pm2xxx_charger_batt_therm_mngt(pm2, val &
 428                         (PM2XXX_INT4_S_ITBATTEMPCOLD |
 429                         PM2XXX_INT4_S_ITBATTEMPHOT));
 430                 dev_dbg(pm2->dev, "BTEMP is too Low/High\n");
 431         }
 432
 433         return ret;
 434 }
 435
 436 static int pm2_int_reg4(void *pm2_data, int val)
 437 {
 438         struct pm2xxx_charger *pm2 = pm2_data;
 439         int ret = 0;
 440
 441         if (val & PM2XXX_INT5_ITVSYSTEMOVV) {
 442                 pm2->failure_case = VSYSTEM_OVV;
 443                 ret = pm2xxx_charger_ovv_mngt(pm2, val &
 444                                                 PM2XXX_INT5_ITVSYSTEMOVV);
 445                 dev_dbg(pm2->dev, "VSYSTEM overvoltage detected\n");
 446         }
 447
 448         if (val & (PM2XXX_INT5_ITTHERMALWARNINGFALL |
 449                                 PM2XXX_INT5_ITTHERMALWARNINGRISE |
 450                                 PM2XXX_INT5_ITTHERMALSHUTDOWNFALL |
 451                                 PM2XXX_INT5_ITTHERMALSHUTDOWNRISE)) {
 452                 dev_dbg(pm2->dev, "BTEMP die temperature is too Low/High\n");
 453                 ret = pm2xxx_charger_die_therm_mngt(pm2, val &
 454                         (PM2XXX_INT5_ITTHERMALWARNINGFALL |
 455                         PM2XXX_INT5_ITTHERMALWARNINGRISE |
 456                         PM2XXX_INT5_ITTHERMALSHUTDOWNFALL |
 457                         PM2XXX_INT5_ITTHERMALSHUTDOWNRISE));
 458         }
 459
 460         return ret;
 461 }
 462
 463 static int pm2_int_reg5(void *pm2_data, int val)
 464 {
 465         struct pm2xxx_charger *pm2 = pm2_data;
 466         int ret = 0;
 467
 468         if (val & (PM2XXX_INT6_ITVPWR2DROP | PM2XXX_INT6_ITVPWR1DROP)) {
 469                 dev_dbg(pm2->dev, "VMPWR drop to VBAT level\n");
 470         }
 471
 472         if (val & (PM2XXX_INT6_ITVPWR2VALIDRISE |
 473                         PM2XXX_INT6_ITVPWR1VALIDRISE |
 474                         PM2XXX_INT6_ITVPWR2VALIDFALL |
 475                         PM2XXX_INT6_ITVPWR1VALIDFALL)) {
 476                 dev_dbg(pm2->dev, "Falling/Rising edge on WPWR1/2\n");
 477         }
 478
 479         return ret;
 480 }
 481
 482 static irqreturn_t  pm2xxx_irq_int(int irq, void *data)
 483 {
 484         struct pm2xxx_charger *pm2 = data;
 485         struct pm2xxx_interrupts *interrupt = pm2->pm2_int;
 486         int i;
 487
 488         /* wake up the device */
 489         pm_runtime_get_sync(pm2->dev);
 490
 491         do {
 492                 for (i = 0; i < PM2XXX_NUM_INT_REG; i++) {
 493                         pm2xxx_reg_read(pm2,
 494                                 pm2xxx_interrupt_registers[i],
 495                                 &(interrupt->reg[i]));
 496
 497                         if (interrupt->reg[i] > 0)
 498                                 interrupt->handler[i](pm2, interrupt->reg[i]);
 499                 }
 500         } while (gpio_get_value(pm2->pdata->gpio_irq_number) == 0);
 501
 502         pm_runtime_mark_last_busy(pm2->dev);
 503         pm_runtime_put_autosuspend(pm2->dev);
 504
 505         return IRQ_HANDLED;
 506 }
 507
 508 static int pm2xxx_charger_get_ac_cv(struct pm2xxx_charger *pm2)
 509 {
 510         int ret = 0;
 511         u8 val;
 512
 513         if (pm2->ac.charger_connected && pm2->ac.charger_online) {
 514
 515                 ret = pm2xxx_reg_read(pm2, PM2XXX_SRCE_REG_INT4, &val);
 516                 if (ret < 0) {
 517                         dev_err(pm2->dev, "%s pm2xxx read failed\n", __func__);
 518                         goto out;
 519                 }
 520
 521                 if (val & PM2XXX_INT4_S_ITCVPHASE)
 522                         ret = PM2XXX_CONST_VOLT;
 523                 else
 524                         ret = PM2XXX_CONST_CURR;
 525         }
 526 out:
 527         return ret;
 528 }
 529
 530 static int pm2xxx_current_to_regval(int curr)
 531 {
 532         int i;
 533
 534         if (curr < pm2xxx_charger_current_map[0])
 535                 return 0;
 536
 537         for (i = 1; i < ARRAY_SIZE(pm2xxx_charger_current_map); i++) {
 538                 if (curr < pm2xxx_charger_current_map[i])
 539                         return (i - 1);
 540         }
 541
 542         i = ARRAY_SIZE(pm2xxx_charger_current_map) - 1;
 543         if (curr == pm2xxx_charger_current_map[i])
 544                 return i;
 545         else
 546                 return -EINVAL;
 547 }
 548
 549 static int pm2xxx_voltage_to_regval(int curr)
 550 {
 551         int i;
 552
 553         if (curr < pm2xxx_charger_voltage_map[0])
 554                 return 0;
 555
 556         for (i = 1; i < ARRAY_SIZE(pm2xxx_charger_voltage_map); i++) {
 557                 if (curr < pm2xxx_charger_voltage_map[i])
 558                         return i - 1;
 559         }
 560
 561         i = ARRAY_SIZE(pm2xxx_charger_voltage_map) - 1;
 562         if (curr == pm2xxx_charger_voltage_map[i])
 563                 return i;
 564         else
 565                 return -EINVAL;
 566 }
 567
 568 static int pm2xxx_charger_update_charger_current(struct ux500_charger *charger,
 569                 int ich_out)
 570 {
 571         int ret;
 572         int curr_index;
 573         struct pm2xxx_charger *pm2;
 574         u8 val;
 575
 576         if (charger->psy->desc->type == POWER_SUPPLY_TYPE_MAINS)
 577                 pm2 = to_pm2xxx_charger_ac_device_info(charger);
 578         else
 579                 return -ENXIO;
 580
 581         curr_index = pm2xxx_current_to_regval(ich_out);
 582         if (curr_index < 0) {
 583                 dev_err(pm2->dev,
 584                         "Charger current too high, charging not started\n");
 585                 return -ENXIO;
 586         }
 587
 588         ret = pm2xxx_reg_read(pm2, PM2XXX_BATT_CTRL_REG6, &val);
 589         if (ret >= 0) {
 590                 val &= ~PM2XXX_DIR_CH_CC_CURRENT_MASK;
 591                 val |= curr_index;
 592                 ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG6, val);
 593                 if (ret < 0) {
 594                         dev_err(pm2->dev,
 595                                 "%s write failed\n", __func__);
 596                 }
 597         }
 598         else
 599                 dev_err(pm2->dev, "%s read failed\n", __func__);
 600
 601         return ret;
 602 }
 603
 604 static int pm2xxx_charger_ac_get_property(struct power_supply *psy,
 605         enum power_supply_property psp,
 606         union power_supply_propval *val)
 607 {
 608         struct pm2xxx_charger *pm2;
 609
 610         pm2 = to_pm2xxx_charger_ac_device_info(psy_to_ux500_charger(psy));
 611
 612         switch (psp) {
 613         case POWER_SUPPLY_PROP_HEALTH:
 614                 if (pm2->flags.mainextchnotok)
 615                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 616                 else if (pm2->ac.wd_expired)
 617                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
 618                 else if (pm2->flags.main_thermal_prot)
 619                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 620                 else if (pm2->flags.ovv)
 621                         val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 622                 else
 623                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
 624                 break;
 625         case POWER_SUPPLY_PROP_ONLINE:
 626                 val->intval = pm2->ac.charger_online;
 627                 break;
 628         case POWER_SUPPLY_PROP_PRESENT:
 629                 val->intval = pm2->ac.charger_connected;
 630                 break;
 631         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
 632                 pm2->ac.cv_active = pm2xxx_charger_get_ac_cv(pm2);
 633                 val->intval = pm2->ac.cv_active;
 634                 break;
 635         default:
 636                 return -EINVAL;
 637         }
 638         return 0;
 639 }
 640
 641 static int pm2xxx_charging_init(struct pm2xxx_charger *pm2)
 642 {
 643         int ret = 0;
 644
 645         /* enable CC and CV watchdog */
 646         ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG3,
 647                 (PM2XXX_CH_WD_CV_PHASE_60MIN | PM2XXX_CH_WD_CC_PHASE_60MIN));
 648         if( ret < 0)
 649                 return ret;
 650
 651         /* enable precharge watchdog */
 652         ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG4,
 653                                         PM2XXX_CH_WD_PRECH_PHASE_60MIN);
 654
 655         /* Disable auto timeout */
 656         ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG5,
 657                                         PM2XXX_CH_WD_AUTO_TIMEOUT_20MIN);
 658
 659         /*
 660      * EOC current level = 100mA
 661          * Precharge current level = 100mA
 662          * CC current level = 1000mA
 663          */
 664         ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG6,
 665                 (PM2XXX_DIR_CH_CC_CURRENT_1000MA |
 666                 PM2XXX_CH_PRECH_CURRENT_100MA |
 667                 PM2XXX_CH_EOC_CURRENT_100MA));
 668
 669         /*
 670      * recharge threshold = 3.8V
 671          * Precharge to CC threshold = 2.9V
 672          */
 673         ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG7,
 674                 (PM2XXX_CH_PRECH_VOL_2_9 | PM2XXX_CH_VRESUME_VOL_3_8));
 675
 676         /* float voltage charger level = 4.2V */
 677         ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG8,
 678                 PM2XXX_CH_VOLT_4_2);
 679
 680         /* Voltage drop between VBAT and VSYS in HW charging = 300mV */
 681         ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG9,
 682                 (PM2XXX_CH_150MV_DROP_300MV | PM2XXX_CHARCHING_INFO_DIS |
 683                 PM2XXX_CH_CC_REDUCED_CURRENT_IDENT |
 684                 PM2XXX_CH_CC_MODEDROP_DIS));
 685
 686         /* Input charger level of over voltage = 10V */
 687         ret = pm2xxx_reg_write(pm2, PM2XXX_INP_VOLT_VPWR2,
 688                                         PM2XXX_VPWR2_OVV_10);
 689         ret = pm2xxx_reg_write(pm2, PM2XXX_INP_VOLT_VPWR1,
 690                                         PM2XXX_VPWR1_OVV_10);
 691
 692         /* Input charger drop */
 693         ret = pm2xxx_reg_write(pm2, PM2XXX_INP_DROP_VPWR2,
 694                 (PM2XXX_VPWR2_HW_OPT_DIS | PM2XXX_VPWR2_VALID_DIS |
 695                 PM2XXX_VPWR2_DROP_DIS));
 696         ret = pm2xxx_reg_write(pm2, PM2XXX_INP_DROP_VPWR1,
 697                 (PM2XXX_VPWR1_HW_OPT_DIS | PM2XXX_VPWR1_VALID_DIS |
 698                 PM2XXX_VPWR1_DROP_DIS));
 699
 700         /* Disable battery low monitoring */
 701         ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_LOW_LEV_COMP_REG,
 702                 PM2XXX_VBAT_LOW_MONITORING_ENA);
 703
 704         return ret;
 705 }
 706
 707 static int pm2xxx_charger_ac_en(struct ux500_charger *charger,
 708         int enable, int vset, int iset)
 709 {
 710         int ret;
 711         int volt_index;
 712         int curr_index;
 713         u8 val;
 714
 715         struct pm2xxx_charger *pm2 = to_pm2xxx_charger_ac_device_info(charger);
 716
 717         if (enable) {
 718                 if (!pm2->ac.charger_connected) {
 719                         dev_dbg(pm2->dev, "AC charger not connected\n");
 720                         return -ENXIO;
 721                 }
 722
 723                 dev_dbg(pm2->dev, "Enable AC: %dmV %dmA\n", vset, iset);
 724                 if (!pm2->vddadc_en_ac) {
 725                         ret = regulator_enable(pm2->regu);
 726                         if (ret)
 727                                 dev_warn(pm2->dev,
 728                                         "Failed to enable vddadc regulator\n");
 729                         else
 730                                 pm2->vddadc_en_ac = true;
 731                 }
 732
 733                 ret = pm2xxx_charging_init(pm2);
 734                 if (ret < 0) {
 735                         dev_err(pm2->dev, "%s charging init failed\n",
 736                                         __func__);
 737                         goto error_occured;
 738                 }
 739
 740                 volt_index = pm2xxx_voltage_to_regval(vset);
 741                 curr_index = pm2xxx_current_to_regval(iset);
 742
 743                 if (volt_index < 0 || curr_index < 0) {
 744                         dev_err(pm2->dev,
 745                                 "Charger voltage or current too high, "
 746                                 "charging not started\n");
 747                         return -ENXIO;
 748                 }
 749
 750                 ret = pm2xxx_reg_read(pm2, PM2XXX_BATT_CTRL_REG8, &val);
 751                 if (ret < 0) {
 752                         dev_err(pm2->dev, "%s pm2xxx read failed\n", __func__);
 753                         goto error_occured;
 754                 }
 755                 val &= ~PM2XXX_CH_VOLT_MASK;
 756                 val |= volt_index;
 757                 ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG8, val);
 758                 if (ret < 0) {
 759                         dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
 760                         goto error_occured;
 761                 }
 762
 763                 ret = pm2xxx_reg_read(pm2, PM2XXX_BATT_CTRL_REG6, &val);
 764                 if (ret < 0) {
 765                         dev_err(pm2->dev, "%s pm2xxx read failed\n", __func__);
 766                         goto error_occured;
 767                 }
 768                 val &= ~PM2XXX_DIR_CH_CC_CURRENT_MASK;
 769                 val |= curr_index;
 770                 ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG6, val);
 771                 if (ret < 0) {
 772                         dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
 773                         goto error_occured;
 774                 }
 775
 776                 if (!pm2->bat->enable_overshoot) {
 777                         ret = pm2xxx_reg_read(pm2, PM2XXX_LED_CTRL_REG, &val);
 778                         if (ret < 0) {
 779                                 dev_err(pm2->dev, "%s pm2xxx read failed\n",
 780                                                                 __func__);
 781                                 goto error_occured;
 782                         }
 783                         val |= PM2XXX_ANTI_OVERSHOOT_EN;
 784                         ret = pm2xxx_reg_write(pm2, PM2XXX_LED_CTRL_REG, val);
 785                         if (ret < 0) {
 786                                 dev_err(pm2->dev, "%s pm2xxx write failed\n",
 787                                                                 __func__);
 788                                 goto error_occured;
 789                         }
 790                 }
 791
 792                 ret = pm2xxx_charging_enable_mngt(pm2);
 793                 if (ret < 0) {
 794                         dev_err(pm2->dev, "Failed to enable"
 795                                                 "pm2xxx ac charger\n");
 796                         goto error_occured;
 797                 }
 798
 799                 pm2->ac.charger_online = 1;
 800         } else {
 801                 pm2->ac.charger_online = 0;
 802                 pm2->ac.wd_expired = false;
 803
 804                 /* Disable regulator if enabled */
 805                 if (pm2->vddadc_en_ac) {
 806                         regulator_disable(pm2->regu);
 807                         pm2->vddadc_en_ac = false;
 808                 }
 809
 810                 ret = pm2xxx_charging_disable_mngt(pm2);
 811                 if (ret < 0) {
 812                         dev_err(pm2->dev, "failed to disable"
 813                                                 "pm2xxx ac charger\n");
 814                         goto error_occured;
 815                 }
 816
 817                 dev_dbg(pm2->dev, "PM2301: " "Disabled AC charging\n");
 818         }
 819         power_supply_changed(pm2->ac_chg.psy);
 820
 821 error_occured:
 822         return ret;
 823 }
 824
 825 static int pm2xxx_charger_watchdog_kick(struct ux500_charger *charger)
 826 {
 827         int ret;
 828         struct pm2xxx_charger *pm2;
 829
 830         if (charger->psy->desc->type == POWER_SUPPLY_TYPE_MAINS)
 831                 pm2 = to_pm2xxx_charger_ac_device_info(charger);
 832         else
 833                 return -ENXIO;
 834
 835         ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_WD_KICK, WD_TIMER);
 836         if (ret)
 837                 dev_err(pm2->dev, "Failed to kick WD!\n");
 838
 839         return ret;
 840 }
 841
 842 static void pm2xxx_charger_ac_work(struct work_struct *work)
 843 {
 844         struct pm2xxx_charger *pm2 = container_of(work,
 845                 struct pm2xxx_charger, ac_work);
 846
 847
 848         power_supply_changed(pm2->ac_chg.psy);
 849         sysfs_notify(&pm2->ac_chg.psy->dev.kobj, NULL, "present");
 850 };
 851
 852 static void pm2xxx_charger_check_hw_failure_work(struct work_struct *work)
 853 {
 854         u8 reg_value;
 855
 856         struct pm2xxx_charger *pm2 = container_of(work,
 857                 struct pm2xxx_charger, check_hw_failure_work.work);
 858
 859         if (pm2->flags.ovv) {
 860                 pm2xxx_reg_read(pm2, PM2XXX_SRCE_REG_INT4, &reg_value);
 861
 862                 if (!(reg_value & (PM2XXX_INT4_S_ITVPWR1OVV |
 863                                         PM2XXX_INT4_S_ITVPWR2OVV))) {
 864                         pm2->flags.ovv = false;
 865                         power_supply_changed(pm2->ac_chg.psy);
 866                 }
 867         }
 868
 869         /* If we still have a failure, schedule a new check */
 870         if (pm2->flags.ovv) {
 871                 queue_delayed_work(pm2->charger_wq,
 872                         &pm2->check_hw_failure_work, round_jiffies(HZ));
 873         }
 874 }
 875
 876 static void pm2xxx_charger_check_main_thermal_prot_work(
 877         struct work_struct *work)
 878 {
 879         int ret;
 880         u8 val;
 881
 882         struct pm2xxx_charger *pm2 = container_of(work, struct pm2xxx_charger,
 883                                         check_main_thermal_prot_work);
 884
 885         /* Check if die temp warning is still active */
 886         ret = pm2xxx_reg_read(pm2, PM2XXX_SRCE_REG_INT5, &val);
 887         if (ret < 0) {
 888                 dev_err(pm2->dev, "%s pm2xxx read failed\n", __func__);
 889                 return;
 890         }
 891         if (val & (PM2XXX_INT5_S_ITTHERMALWARNINGRISE
 892                         | PM2XXX_INT5_S_ITTHERMALSHUTDOWNRISE))
 893                 pm2->flags.main_thermal_prot = true;
 894         else if (val & (PM2XXX_INT5_S_ITTHERMALWARNINGFALL
 895                                 | PM2XXX_INT5_S_ITTHERMALSHUTDOWNFALL))
 896                 pm2->flags.main_thermal_prot = false;
 897
 898         power_supply_changed(pm2->ac_chg.psy);
 899 }
 900
 901 static struct pm2xxx_interrupts pm2xxx_int = {
 902         .handler[0] = pm2_int_reg0,
 903         .handler[1] = pm2_int_reg1,
 904         .handler[2] = pm2_int_reg2,
 905         .handler[3] = pm2_int_reg3,
 906         .handler[4] = pm2_int_reg4,
 907         .handler[5] = pm2_int_reg5,
 908 };
 909
 910 static struct pm2xxx_irq pm2xxx_charger_irq[] = {
 911         {"PM2XXX_IRQ_INT", pm2xxx_irq_int},
 912 };
 913
 914 #ifdef CONFIG_PM
 915
 916 #ifdef CONFIG_PM_SLEEP
 917
 918 static int pm2xxx_wall_charger_resume(struct device *dev)
 919 {
 920         struct i2c_client *i2c_client = to_i2c_client(dev);
 921         struct pm2xxx_charger *pm2;
 922
 923         pm2 =  (struct pm2xxx_charger *)i2c_get_clientdata(i2c_client);
 924         set_lpn_pin(pm2);
 925
 926         /* If we still have a HW failure, schedule a new check */
 927         if (pm2->flags.ovv)
 928                 queue_delayed_work(pm2->charger_wq,
 929                                 &pm2->check_hw_failure_work, 0);
 930
 931         return 0;
 932 }
 933
 934 static int pm2xxx_wall_charger_suspend(struct device *dev)
 935 {
 936         struct i2c_client *i2c_client = to_i2c_client(dev);
 937         struct pm2xxx_charger *pm2;
 938
 939         pm2 =  (struct pm2xxx_charger *)i2c_get_clientdata(i2c_client);
 940         clear_lpn_pin(pm2);
 941
 942         /* Cancel any pending HW failure check */
 943         if (delayed_work_pending(&pm2->check_hw_failure_work))
 944                 cancel_delayed_work(&pm2->check_hw_failure_work);
 945
 946         flush_work(&pm2->ac_work);
 947         flush_work(&pm2->check_main_thermal_prot_work);
 948
 949         return 0;
 950 }
 951
 952 #endif
 953
 954 static int  pm2xxx_runtime_suspend(struct device *dev)
 955 {
 956         struct i2c_client *pm2xxx_i2c_client = to_i2c_client(dev);
 957         struct pm2xxx_charger *pm2;
 958
 959         pm2 = (struct pm2xxx_charger *)i2c_get_clientdata(pm2xxx_i2c_client);
 960         clear_lpn_pin(pm2);
 961
 962         return 0;
 963 }
 964
 965 static int  pm2xxx_runtime_resume(struct device *dev)
 966 {
 967         struct i2c_client *pm2xxx_i2c_client = to_i2c_client(dev);
 968         struct pm2xxx_charger *pm2;
 969
 970         pm2 = (struct pm2xxx_charger *)i2c_get_clientdata(pm2xxx_i2c_client);
 971
 972         if (gpio_is_valid(pm2->lpn_pin) && gpio_get_value(pm2->lpn_pin) == 0)
 973                 set_lpn_pin(pm2);
 974
 975         return 0;
 976 }
 977
 978 static const struct dev_pm_ops pm2xxx_pm_ops = {
 979         SET_SYSTEM_SLEEP_PM_OPS(pm2xxx_wall_charger_suspend,
 980                 pm2xxx_wall_charger_resume)
 981         SET_RUNTIME_PM_OPS(pm2xxx_runtime_suspend, pm2xxx_runtime_resume, NULL)
 982 };
 983 #define  PM2XXX_PM_OPS (&pm2xxx_pm_ops)
 984 #else
 985 #define  PM2XXX_PM_OPS  NULL
 986 #endif
 987
 988 static int pm2xxx_wall_charger_probe(struct i2c_client *i2c_client,
 989                 const struct i2c_device_id *id)
 990 {
 991         struct pm2xxx_platform_data *pl_data = i2c_client->dev.platform_data;
 992         struct power_supply_config psy_cfg = {};
 993         struct pm2xxx_charger *pm2;
 994         int ret = 0;
 995         u8 val;
 996         int i;
 997
 998         if (!pl_data) {
 999                 dev_err(&i2c_client->dev, "No platform data supplied\n");
1000                 return -EINVAL;
1001         }
1002
1003         pm2 = kzalloc(sizeof(struct pm2xxx_charger), GFP_KERNEL);
1004         if (!pm2) {
1005                 dev_err(&i2c_client->dev, "pm2xxx_charger allocation failed\n");
1006                 return -ENOMEM;
1007         }
1008
1009         /* get parent data */
1010         pm2->dev = &i2c_client->dev;
1011
1012         pm2->pm2_int = &pm2xxx_int;
1013
1014         /* get charger spcific platform data */
1015         if (!pl_data->wall_charger) {
1016                 dev_err(pm2->dev, "no charger platform data supplied\n");
1017                 ret = -EINVAL;
1018                 goto free_device_info;
1019         }
1020
1021         pm2->pdata = pl_data->wall_charger;
1022
1023         /* get battery specific platform data */
1024         if (!pl_data->battery) {
1025                 dev_err(pm2->dev, "no battery platform data supplied\n");
1026                 ret = -EINVAL;
1027                 goto free_device_info;
1028         }
1029
1030         pm2->bat = pl_data->battery;
1031
1032         if (!i2c_check_functionality(i2c_client->adapter,
1033                         I2C_FUNC_SMBUS_BYTE_DATA |
1034                         I2C_FUNC_SMBUS_READ_WORD_DATA)) {
1035                 ret = -ENODEV;
1036                 dev_info(pm2->dev, "pm2301 i2c_check_functionality failed\n");
1037                 goto free_device_info;
1038         }
1039
1040         pm2->config.pm2xxx_i2c = i2c_client;
1041         pm2->config.pm2xxx_id = (struct i2c_device_id *) id;
1042         i2c_set_clientdata(i2c_client, pm2);
1043
1044         /* AC supply */
1045         /* power_supply base class */
1046         pm2->ac_chg_desc.name = pm2->pdata->label;
1047         pm2->ac_chg_desc.type = POWER_SUPPLY_TYPE_MAINS;
1048         pm2->ac_chg_desc.properties = pm2xxx_charger_ac_props;
1049         pm2->ac_chg_desc.num_properties = ARRAY_SIZE(pm2xxx_charger_ac_props);
1050         pm2->ac_chg_desc.get_property = pm2xxx_charger_ac_get_property;
1051
1052         psy_cfg.supplied_to = pm2->pdata->supplied_to;
1053         psy_cfg.num_supplicants = pm2->pdata->num_supplicants;
1054         /* pm2xxx_charger sub-class */
1055         pm2->ac_chg.ops.enable = &pm2xxx_charger_ac_en;
1056         pm2->ac_chg.ops.kick_wd = &pm2xxx_charger_watchdog_kick;
1057         pm2->ac_chg.ops.update_curr = &pm2xxx_charger_update_charger_current;
1058         pm2->ac_chg.max_out_volt = pm2xxx_charger_voltage_map[
1059                 ARRAY_SIZE(pm2xxx_charger_voltage_map) - 1];
1060         pm2->ac_chg.max_out_curr = pm2xxx_charger_current_map[
1061                 ARRAY_SIZE(pm2xxx_charger_current_map) - 1];
1062         pm2->ac_chg.wdt_refresh = WD_KICK_INTERVAL;
1063         pm2->ac_chg.enabled = true;
1064         pm2->ac_chg.external = true;
1065
1066         /* Create a work queue for the charger */
1067         pm2->charger_wq = create_singlethread_workqueue("pm2xxx_charger_wq");
1068         if (pm2->charger_wq == NULL) {
1069                 ret = -ENOMEM;
1070                 dev_err(pm2->dev, "failed to create work queue\n");
1071                 goto free_device_info;
1072         }
1073
1074         /* Init work for charger detection */
1075         INIT_WORK(&pm2->ac_work, pm2xxx_charger_ac_work);
1076
1077         /* Init work for checking HW status */
1078         INIT_WORK(&pm2->check_main_thermal_prot_work,
1079                 pm2xxx_charger_check_main_thermal_prot_work);
1080
1081         /* Init work for HW failure check */
1082         INIT_DEFERRABLE_WORK(&pm2->check_hw_failure_work,
1083                 pm2xxx_charger_check_hw_failure_work);
1084
1085         /*
1086          * VDD ADC supply needs to be enabled from this driver when there
1087          * is a charger connected to avoid erroneous BTEMP_HIGH/LOW
1088          * interrupts during charging
1089          */
1090         pm2->regu = regulator_get(pm2->dev, "vddadc");
1091         if (IS_ERR(pm2->regu)) {
1092                 ret = PTR_ERR(pm2->regu);
1093                 dev_err(pm2->dev, "failed to get vddadc regulator\n");
1094                 goto free_charger_wq;
1095         }
1096
1097         /* Register AC charger class */
1098         pm2->ac_chg.psy = power_supply_register(pm2->dev, &pm2->ac_chg_desc,
1099                                                 &psy_cfg);
1100         if (IS_ERR(pm2->ac_chg.psy)) {
1101                 dev_err(pm2->dev, "failed to register AC charger\n");
1102                 ret = PTR_ERR(pm2->ac_chg.psy);
1103                 goto free_regulator;
1104         }
1105
1106         /* Register interrupts */
1107         ret = request_threaded_irq(gpio_to_irq(pm2->pdata->gpio_irq_number),
1108                                 NULL,
1109                                 pm2xxx_charger_irq[0].isr,
1110                                 pm2->pdata->irq_type,
1111                                 pm2xxx_charger_irq[0].name, pm2);
1112
1113         if (ret != 0) {
1114                 dev_err(pm2->dev, "failed to request %s IRQ %d: %d\n",
1115                 pm2xxx_charger_irq[0].name,
1116                         gpio_to_irq(pm2->pdata->gpio_irq_number), ret);
1117                 goto unregister_pm2xxx_charger;
1118         }
1119
1120         ret = pm_runtime_set_active(pm2->dev);
1121         if (ret)
1122                 dev_err(pm2->dev, "set active Error\n");
1123
1124         pm_runtime_enable(pm2->dev);
1125         pm_runtime_set_autosuspend_delay(pm2->dev, PM2XXX_AUTOSUSPEND_DELAY);
1126         pm_runtime_use_autosuspend(pm2->dev);
1127         pm_runtime_resume(pm2->dev);
1128
1129         /* pm interrupt can wake up system */
1130         ret = enable_irq_wake(gpio_to_irq(pm2->pdata->gpio_irq_number));
1131         if (ret) {
1132                 dev_err(pm2->dev, "failed to set irq wake\n");
1133                 goto unregister_pm2xxx_interrupt;
1134         }
1135
1136         mutex_init(&pm2->lock);
1137
1138         if (gpio_is_valid(pm2->pdata->lpn_gpio)) {
1139                 /* get lpn GPIO from platform data */
1140                 pm2->lpn_pin = pm2->pdata->lpn_gpio;
1141
1142                 /*
1143                  * Charger detection mechanism requires pulling up the LPN pin
1144                  * while i2c communication if Charger is not connected
1145                  * LPN pin of PM2301 is GPIO60 of AB9540
1146                  */
1147                 ret = gpio_request(pm2->lpn_pin, "pm2301_lpm_gpio");
1148
1149                 if (ret < 0) {
1150                         dev_err(pm2->dev, "pm2301_lpm_gpio request failed\n");
1151                         goto disable_pm2_irq_wake;
1152                 }
1153                 ret = gpio_direction_output(pm2->lpn_pin, 0);
1154                 if (ret < 0) {
1155                         dev_err(pm2->dev, "pm2301_lpm_gpio direction failed\n");
1156                         goto free_gpio;
1157                 }
1158                 set_lpn_pin(pm2);
1159         }
1160
1161         /* read  interrupt registers */
1162         for (i = 0; i < PM2XXX_NUM_INT_REG; i++)
1163                 pm2xxx_reg_read(pm2,
1164                         pm2xxx_interrupt_registers[i],
1165                         &val);
1166
1167         ret = pm2xxx_charger_detection(pm2, &val);
1168
1169         if ((ret == 0) && val) {
1170                 pm2->ac.charger_connected = 1;
1171                 ab8500_override_turn_on_stat(~AB8500_POW_KEY_1_ON,
1172                                              AB8500_MAIN_CH_DET);
1173                 pm2->ac_conn = true;
1174                 power_supply_changed(pm2->ac_chg.psy);
1175                 sysfs_notify(&pm2->ac_chg.psy->dev.kobj, NULL, "present");
1176         }
1177
1178         return 0;
1179
1180 free_gpio:
1181         if (gpio_is_valid(pm2->lpn_pin))
1182                 gpio_free(pm2->lpn_pin);
1183 disable_pm2_irq_wake:
1184         disable_irq_wake(gpio_to_irq(pm2->pdata->gpio_irq_number));
1185 unregister_pm2xxx_interrupt:
1186         /* disable interrupt */
1187         free_irq(gpio_to_irq(pm2->pdata->gpio_irq_number), pm2);
1188 unregister_pm2xxx_charger:
1189         /* unregister power supply */
1190         power_supply_unregister(pm2->ac_chg.psy);
1191 free_regulator:
1192         /* disable the regulator */
1193         regulator_put(pm2->regu);
1194 free_charger_wq:
1195         destroy_workqueue(pm2->charger_wq);
1196 free_device_info:
1197         kfree(pm2);
1198
1199         return ret;
1200 }
1201
1202 static int pm2xxx_wall_charger_remove(struct i2c_client *i2c_client)
1203 {
1204         struct pm2xxx_charger *pm2 = i2c_get_clientdata(i2c_client);
1205
1206         /* Disable pm_runtime */
1207         pm_runtime_disable(pm2->dev);
1208         /* Disable AC charging */
1209         pm2xxx_charger_ac_en(&pm2->ac_chg, false, 0, 0);
1210
1211         /* Disable wake by pm interrupt */
1212         disable_irq_wake(gpio_to_irq(pm2->pdata->gpio_irq_number));
1213
1214         /* Disable interrupts */
1215         free_irq(gpio_to_irq(pm2->pdata->gpio_irq_number), pm2);
1216
1217         /* Delete the work queue */
1218         destroy_workqueue(pm2->charger_wq);
1219
1220         flush_scheduled_work();
1221
1222         /* disable the regulator */
1223         regulator_put(pm2->regu);
1224
1225         power_supply_unregister(pm2->ac_chg.psy);
1226
1227         if (gpio_is_valid(pm2->lpn_pin))
1228                 gpio_free(pm2->lpn_pin);
1229
1230         kfree(pm2);
1231
1232         return 0;
1233 }
1234
1235 static const struct i2c_device_id pm2xxx_id[] = {
1236         { "pm2301", 0 },
1237         { }
1238 };
1239
1240 MODULE_DEVICE_TABLE(i2c, pm2xxx_id);
1241
1242 static struct i2c_driver pm2xxx_charger_driver = {
1243         .probe = pm2xxx_wall_charger_probe,
1244         .remove = pm2xxx_wall_charger_remove,
1245         .driver = {
1246                 .name = "pm2xxx-wall_charger",
1247                 .pm = PM2XXX_PM_OPS,
1248         },
1249         .id_table = pm2xxx_id,
1250 };
1251
1252 static int __init pm2xxx_charger_init(void)
1253 {
1254         return i2c_add_driver(&pm2xxx_charger_driver);
1255 }
1256
1257 static void __exit pm2xxx_charger_exit(void)
1258 {
1259         i2c_del_driver(&pm2xxx_charger_driver);
1260 }
1261
1262 device_initcall_sync(pm2xxx_charger_init);
1263 module_exit(pm2xxx_charger_exit);
1264
1265 MODULE_LICENSE("GPL v2");
1266 MODULE_AUTHOR("Rajkumar kasirajan, Olivier Launay");
1267 MODULE_ALIAS("i2c:pm2xxx-charger");
1268 MODULE_DESCRIPTION("PM2xxx charger management driver");