drivers/power/wm8350_power.c

   1 /*
   2  * Battery driver for wm8350 PMIC
   3  *
   4  * Copyright 2007, 2008 Wolfson Microelectronics PLC.
   5  *
   6  * Based on OLPC Battery Driver
   7  *
   8  * Copyright 2006  David Woodhouse <dwmw2@infradead.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/err.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/power_supply.h>
  19 #include <linux/mfd/wm8350/supply.h>
  20 #include <linux/mfd/wm8350/core.h>
  21 #include <linux/mfd/wm8350/comparator.h>
  22
  23 static int wm8350_read_battery_uvolts(struct wm8350 *wm8350)
  24 {
  25         return wm8350_read_auxadc(wm8350, WM8350_AUXADC_BATT, 0, 0)
  26                 * WM8350_AUX_COEFF;
  27 }
  28
  29 static int wm8350_read_line_uvolts(struct wm8350 *wm8350)
  30 {
  31         return wm8350_read_auxadc(wm8350, WM8350_AUXADC_LINE, 0, 0)
  32                 * WM8350_AUX_COEFF;
  33 }
  34
  35 static int wm8350_read_usb_uvolts(struct wm8350 *wm8350)
  36 {
  37         return wm8350_read_auxadc(wm8350, WM8350_AUXADC_USB, 0, 0)
  38                 * WM8350_AUX_COEFF;
  39 }
  40
  41 #define WM8350_BATT_SUPPLY      1
  42 #define WM8350_USB_SUPPLY       2
  43 #define WM8350_LINE_SUPPLY      4
  44
  45 static inline int wm8350_charge_time_min(struct wm8350 *wm8350, int min)
  46 {
  47         if (!wm8350->power.rev_g_coeff)
  48                 return (((min - 30) / 15) & 0xf) << 8;
  49         else
  50                 return (((min - 30) / 30) & 0xf) << 8;
  51 }
  52
  53 static int wm8350_get_supplies(struct wm8350 *wm8350)
  54 {
  55         u16 sm, ov, co, chrg;
  56         int supplies = 0;
  57
  58         sm = wm8350_reg_read(wm8350, WM8350_STATE_MACHINE_STATUS);
  59         ov = wm8350_reg_read(wm8350, WM8350_MISC_OVERRIDES);
  60         co = wm8350_reg_read(wm8350, WM8350_COMPARATOR_OVERRIDES);
  61         chrg = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2);
  62
  63         /* USB_SM */
  64         sm = (sm & WM8350_USB_SM_MASK) >> WM8350_USB_SM_SHIFT;
  65
  66         /* CHG_ISEL */
  67         chrg &= WM8350_CHG_ISEL_MASK;
  68
  69         /* If the USB state machine is active then we're using that with or
  70          * without battery, otherwise check for wall supply */
  71         if (((sm == WM8350_USB_SM_100_SLV) ||
  72              (sm == WM8350_USB_SM_500_SLV) ||
  73              (sm == WM8350_USB_SM_STDBY_SLV))
  74             && !(ov & WM8350_USB_LIMIT_OVRDE))
  75                 supplies = WM8350_USB_SUPPLY;
  76         else if (((sm == WM8350_USB_SM_100_SLV) ||
  77                   (sm == WM8350_USB_SM_500_SLV) ||
  78                   (sm == WM8350_USB_SM_STDBY_SLV))
  79                  && (ov & WM8350_USB_LIMIT_OVRDE) && (chrg == 0))
  80                 supplies = WM8350_USB_SUPPLY | WM8350_BATT_SUPPLY;
  81         else if (co & WM8350_WALL_FB_OVRDE)
  82                 supplies = WM8350_LINE_SUPPLY;
  83         else
  84                 supplies = WM8350_BATT_SUPPLY;
  85
  86         return supplies;
  87 }
  88
  89 static int wm8350_charger_config(struct wm8350 *wm8350,
  90                                  struct wm8350_charger_policy *policy)
  91 {
  92         u16 reg, eoc_mA, fast_limit_mA;
  93
  94         if (!policy) {
  95                 dev_warn(wm8350->dev,
  96                          "No charger policy, charger not configured.\n");
  97                 return -EINVAL;
  98         }
  99
 100         /* make sure USB fast charge current is not > 500mA */
 101         if (policy->fast_limit_USB_mA > 500) {
 102                 dev_err(wm8350->dev, "USB fast charge > 500mA\n");
 103                 return -EINVAL;
 104         }
 105
 106         eoc_mA = WM8350_CHG_EOC_mA(policy->eoc_mA);
 107
 108         wm8350_reg_unlock(wm8350);
 109
 110         reg = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1)
 111                 & WM8350_CHG_ENA_R168;
 112         wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1,
 113                          reg | eoc_mA | policy->trickle_start_mV |
 114                          WM8350_CHG_TRICKLE_TEMP_CHOKE |
 115                          WM8350_CHG_TRICKLE_USB_CHOKE |
 116                          WM8350_CHG_FAST_USB_THROTTLE);
 117
 118         if (wm8350_get_supplies(wm8350) & WM8350_USB_SUPPLY) {
 119                 fast_limit_mA =
 120                         WM8350_CHG_FAST_LIMIT_mA(policy->fast_limit_USB_mA);
 121                 wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2,
 122                             policy->charge_mV | policy->trickle_charge_USB_mA |
 123                             fast_limit_mA | wm8350_charge_time_min(wm8350,
 124                                                 policy->charge_timeout));
 125
 126         } else {
 127                 fast_limit_mA =
 128                         WM8350_CHG_FAST_LIMIT_mA(policy->fast_limit_mA);
 129                 wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2,
 130                             policy->charge_mV | policy->trickle_charge_mA |
 131                             fast_limit_mA | wm8350_charge_time_min(wm8350,
 132                                                 policy->charge_timeout));
 133         }
 134
 135         wm8350_reg_lock(wm8350);
 136         return 0;
 137 }
 138
 139 static int wm8350_batt_status(struct wm8350 *wm8350)
 140 {
 141         u16 state;
 142
 143         state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2);
 144         state &= WM8350_CHG_STS_MASK;
 145
 146         switch (state) {
 147         case WM8350_CHG_STS_OFF:
 148                 return POWER_SUPPLY_STATUS_DISCHARGING;
 149
 150         case WM8350_CHG_STS_TRICKLE:
 151         case WM8350_CHG_STS_FAST:
 152                 return POWER_SUPPLY_STATUS_CHARGING;
 153
 154         default:
 155                 return POWER_SUPPLY_STATUS_UNKNOWN;
 156         }
 157 }
 158
 159 static ssize_t charger_state_show(struct device *dev,
 160                                  struct device_attribute *attr, char *buf)
 161 {
 162         struct wm8350 *wm8350 = dev_get_drvdata(dev);
 163         char *charge;
 164         int state;
 165
 166         state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2) &
 167             WM8350_CHG_STS_MASK;
 168         switch (state) {
 169         case WM8350_CHG_STS_OFF:
 170                 charge = "Charger Off";
 171                 break;
 172         case WM8350_CHG_STS_TRICKLE:
 173                 charge = "Trickle Charging";
 174                 break;
 175         case WM8350_CHG_STS_FAST:
 176                 charge = "Fast Charging";
 177                 break;
 178         default:
 179                 return 0;
 180         }
 181
 182         return sprintf(buf, "%s\n", charge);
 183 }
 184
 185 static DEVICE_ATTR(charger_state, 0444, charger_state_show, NULL);
 186
 187 static void wm8350_charger_handler(struct wm8350 *wm8350, int irq, void *data)
 188 {
 189         struct wm8350_power *power = &wm8350->power;
 190         struct wm8350_charger_policy *policy = power->policy;
 191
 192         switch (irq) {
 193         case WM8350_IRQ_CHG_BAT_FAIL:
 194                 dev_err(wm8350->dev, "battery failed\n");
 195                 break;
 196         case WM8350_IRQ_CHG_TO:
 197                 dev_err(wm8350->dev, "charger timeout\n");
 198                 power_supply_changed(&power->battery);
 199                 break;
 200
 201         case WM8350_IRQ_CHG_BAT_HOT:
 202         case WM8350_IRQ_CHG_BAT_COLD:
 203         case WM8350_IRQ_CHG_START:
 204         case WM8350_IRQ_CHG_END:
 205                 power_supply_changed(&power->battery);
 206                 break;
 207
 208         case WM8350_IRQ_CHG_FAST_RDY:
 209                 dev_dbg(wm8350->dev, "fast charger ready\n");
 210                 wm8350_charger_config(wm8350, policy);
 211                 wm8350_reg_unlock(wm8350);
 212                 wm8350_set_bits(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1,
 213                                 WM8350_CHG_FAST);
 214                 wm8350_reg_lock(wm8350);
 215                 break;
 216
 217         case WM8350_IRQ_CHG_VBATT_LT_3P9:
 218                 dev_warn(wm8350->dev, "battery < 3.9V\n");
 219                 break;
 220         case WM8350_IRQ_CHG_VBATT_LT_3P1:
 221                 dev_warn(wm8350->dev, "battery < 3.1V\n");
 222                 break;
 223         case WM8350_IRQ_CHG_VBATT_LT_2P85:
 224                 dev_warn(wm8350->dev, "battery < 2.85V\n");
 225                 break;
 226
 227                 /* Supply change.  We will overnotify but it should do
 228                  * no harm. */
 229         case WM8350_IRQ_EXT_USB_FB:
 230         case WM8350_IRQ_EXT_WALL_FB:
 231                 wm8350_charger_config(wm8350, policy);
 232         case WM8350_IRQ_EXT_BAT_FB:   /* Fall through */
 233                 power_supply_changed(&power->battery);
 234                 power_supply_changed(&power->usb);
 235                 power_supply_changed(&power->ac);
 236                 break;
 237
 238         default:
 239                 dev_err(wm8350->dev, "Unknown interrupt %d\n", irq);
 240         }
 241 }
 242
 243 /*********************************************************************
 244  *              AC Power
 245  *********************************************************************/
 246 static int wm8350_ac_get_prop(struct power_supply *psy,
 247                               enum power_supply_property psp,
 248                               union power_supply_propval *val)
 249 {
 250         struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
 251         int ret = 0;
 252
 253         switch (psp) {
 254         case POWER_SUPPLY_PROP_ONLINE:
 255                 val->intval = !!(wm8350_get_supplies(wm8350) &
 256                                  WM8350_LINE_SUPPLY);
 257                 break;
 258         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 259                 val->intval = wm8350_read_line_uvolts(wm8350);
 260                 break;
 261         default:
 262                 ret = -EINVAL;
 263                 break;
 264         }
 265         return ret;
 266 }
 267
 268 static enum power_supply_property wm8350_ac_props[] = {
 269         POWER_SUPPLY_PROP_ONLINE,
 270         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 271 };
 272
 273 /*********************************************************************
 274  *              USB Power
 275  *********************************************************************/
 276 static int wm8350_usb_get_prop(struct power_supply *psy,
 277                                enum power_supply_property psp,
 278                                union power_supply_propval *val)
 279 {
 280         struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
 281         int ret = 0;
 282
 283         switch (psp) {
 284         case POWER_SUPPLY_PROP_ONLINE:
 285                 val->intval = !!(wm8350_get_supplies(wm8350) &
 286                                  WM8350_USB_SUPPLY);
 287                 break;
 288         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 289                 val->intval = wm8350_read_usb_uvolts(wm8350);
 290                 break;
 291         default:
 292                 ret = -EINVAL;
 293                 break;
 294         }
 295         return ret;
 296 }
 297
 298 static enum power_supply_property wm8350_usb_props[] = {
 299         POWER_SUPPLY_PROP_ONLINE,
 300         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 301 };
 302
 303 /*********************************************************************
 304  *              Battery properties
 305  *********************************************************************/
 306
 307 static int wm8350_bat_check_health(struct wm8350 *wm8350)
 308 {
 309         u16 reg;
 310
 311         if (wm8350_read_battery_uvolts(wm8350) < 2850000)
 312                 return POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 313
 314         reg = wm8350_reg_read(wm8350, WM8350_CHARGER_OVERRIDES);
 315         if (reg & WM8350_CHG_BATT_HOT_OVRDE)
 316                 return POWER_SUPPLY_HEALTH_OVERHEAT;
 317
 318         if (reg & WM8350_CHG_BATT_COLD_OVRDE)
 319                 return POWER_SUPPLY_HEALTH_COLD;
 320
 321         return POWER_SUPPLY_HEALTH_GOOD;
 322 }
 323
 324 static int wm8350_bat_get_charge_type(struct wm8350 *wm8350)
 325 {
 326         int state;
 327
 328         state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2) &
 329             WM8350_CHG_STS_MASK;
 330         switch (state) {
 331         case WM8350_CHG_STS_OFF:
 332                 return POWER_SUPPLY_CHARGE_TYPE_NONE;
 333         case WM8350_CHG_STS_TRICKLE:
 334                 return POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
 335         case WM8350_CHG_STS_FAST:
 336                 return POWER_SUPPLY_CHARGE_TYPE_FAST;
 337         default:
 338                 return POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
 339         }
 340 }
 341
 342 static int wm8350_bat_get_property(struct power_supply *psy,
 343                                    enum power_supply_property psp,
 344                                    union power_supply_propval *val)
 345 {
 346         struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
 347         int ret = 0;
 348
 349         switch (psp) {
 350         case POWER_SUPPLY_PROP_STATUS:
 351                 val->intval = wm8350_batt_status(wm8350);
 352                 break;
 353         case POWER_SUPPLY_PROP_ONLINE:
 354                 val->intval = !!(wm8350_get_supplies(wm8350) &
 355                                  WM8350_BATT_SUPPLY);
 356                 break;
 357         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 358                 val->intval = wm8350_read_battery_uvolts(wm8350);
 359                 break;
 360         case POWER_SUPPLY_PROP_HEALTH:
 361                 val->intval = wm8350_bat_check_health(wm8350);
 362                 break;
 363         case POWER_SUPPLY_PROP_CHARGE_TYPE:
 364                 val->intval = wm8350_bat_get_charge_type(wm8350);
 365                 break;
 366         default:
 367                 ret = -EINVAL;
 368                 break;
 369         }
 370
 371         return ret;
 372 }
 373
 374 static enum power_supply_property wm8350_bat_props[] = {
 375         POWER_SUPPLY_PROP_STATUS,
 376         POWER_SUPPLY_PROP_ONLINE,
 377         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 378         POWER_SUPPLY_PROP_HEALTH,
 379         POWER_SUPPLY_PROP_CHARGE_TYPE,
 380 };
 381
 382 /*********************************************************************
 383  *              Initialisation
 384  *********************************************************************/
 385
 386 static void wm8350_init_charger(struct wm8350 *wm8350)
 387 {
 388         /* register our interest in charger events */
 389         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT,
 390                             wm8350_charger_handler, NULL);
 391         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
 392         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD,
 393                             wm8350_charger_handler, NULL);
 394         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
 395         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL,
 396                             wm8350_charger_handler, NULL);
 397         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
 398         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_TO,
 399                             wm8350_charger_handler, NULL);
 400         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_TO);
 401         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_END,
 402                             wm8350_charger_handler, NULL);
 403         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_END);
 404         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_START,
 405                             wm8350_charger_handler, NULL);
 406         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_START);
 407         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY,
 408                             wm8350_charger_handler, NULL);
 409         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY);
 410         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9,
 411                             wm8350_charger_handler, NULL);
 412         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
 413         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1,
 414                             wm8350_charger_handler, NULL);
 415         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
 416         wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85,
 417                             wm8350_charger_handler, NULL);
 418         wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
 419
 420         /* and supply change events */
 421         wm8350_register_irq(wm8350, WM8350_IRQ_EXT_USB_FB,
 422                             wm8350_charger_handler, NULL);
 423         wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
 424         wm8350_register_irq(wm8350, WM8350_IRQ_EXT_WALL_FB,
 425                             wm8350_charger_handler, NULL);
 426         wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
 427         wm8350_register_irq(wm8350, WM8350_IRQ_EXT_BAT_FB,
 428                             wm8350_charger_handler, NULL);
 429         wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
 430 }
 431
 432 static void free_charger_irq(struct wm8350 *wm8350)
 433 {
 434         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
 435         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
 436         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
 437         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
 438         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
 439         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
 440         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_TO);
 441         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_TO);
 442         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_END);
 443         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_END);
 444         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_START);
 445         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_START);
 446         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
 447         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
 448         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
 449         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
 450         wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
 451         wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
 452         wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
 453         wm8350_free_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
 454         wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
 455         wm8350_free_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
 456         wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
 457         wm8350_free_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
 458 }
 459
 460 static __devinit int wm8350_power_probe(struct platform_device *pdev)
 461 {
 462         struct wm8350 *wm8350 = platform_get_drvdata(pdev);
 463         struct wm8350_power *power = &wm8350->power;
 464         struct wm8350_charger_policy *policy = power->policy;
 465         struct power_supply *usb = &power->usb;
 466         struct power_supply *battery = &power->battery;
 467         struct power_supply *ac = &power->ac;
 468         int ret;
 469
 470         ac->name = "wm8350-ac";
 471         ac->type = POWER_SUPPLY_TYPE_MAINS;
 472         ac->properties = wm8350_ac_props;
 473         ac->num_properties = ARRAY_SIZE(wm8350_ac_props);
 474         ac->get_property = wm8350_ac_get_prop;
 475         ret = power_supply_register(&pdev->dev, ac);
 476         if (ret)
 477                 return ret;
 478
 479         battery->name = "wm8350-battery";
 480         battery->properties = wm8350_bat_props;
 481         battery->num_properties = ARRAY_SIZE(wm8350_bat_props);
 482         battery->get_property = wm8350_bat_get_property;
 483         battery->use_for_apm = 1;
 484         ret = power_supply_register(&pdev->dev, battery);
 485         if (ret)
 486                 goto battery_failed;
 487
 488         usb->name = "wm8350-usb",
 489         usb->type = POWER_SUPPLY_TYPE_USB;
 490         usb->properties = wm8350_usb_props;
 491         usb->num_properties = ARRAY_SIZE(wm8350_usb_props);
 492         usb->get_property = wm8350_usb_get_prop;
 493         ret = power_supply_register(&pdev->dev, usb);
 494         if (ret)
 495                 goto usb_failed;
 496
 497         ret = device_create_file(&pdev->dev, &dev_attr_charger_state);
 498         if (ret < 0)
 499                 dev_warn(wm8350->dev, "failed to add charge sysfs: %d\n", ret);
 500         ret = 0;
 501
 502         wm8350_init_charger(wm8350);
 503         if (wm8350_charger_config(wm8350, policy) == 0) {
 504                 wm8350_reg_unlock(wm8350);
 505                 wm8350_set_bits(wm8350, WM8350_POWER_MGMT_5, WM8350_CHG_ENA);
 506                 wm8350_reg_lock(wm8350);
 507         }
 508
 509         return ret;
 510
 511 usb_failed:
 512         power_supply_unregister(battery);
 513 battery_failed:
 514         power_supply_unregister(ac);
 515
 516         return ret;
 517 }
 518
 519 static __devexit int wm8350_power_remove(struct platform_device *pdev)
 520 {
 521         struct wm8350 *wm8350 = platform_get_drvdata(pdev);
 522         struct wm8350_power *power = &wm8350->power;
 523
 524         free_charger_irq(wm8350);
 525         device_remove_file(&pdev->dev, &dev_attr_charger_state);
 526         power_supply_unregister(&power->battery);
 527         power_supply_unregister(&power->ac);
 528         power_supply_unregister(&power->usb);
 529         return 0;
 530 }
 531
 532 static struct platform_driver wm8350_power_driver = {
 533         .probe = wm8350_power_probe,
 534         .remove = __devexit_p(wm8350_power_remove),
 535         .driver = {
 536                 .name = "wm8350-power",
 537         },
 538 };
 539
 540 static int __init wm8350_power_init(void)
 541 {
 542         return platform_driver_register(&wm8350_power_driver);
 543 }
 544 module_init(wm8350_power_init);
 545
 546 static void __exit wm8350_power_exit(void)
 547 {
 548         platform_driver_unregister(&wm8350_power_driver);
 549 }
 550 module_exit(wm8350_power_exit);
 551
 552 MODULE_LICENSE("GPL");
 553 MODULE_DESCRIPTION("Power supply driver for WM8350");
 554 MODULE_ALIAS("platform:wm8350-power");