drivers/power/wm831x_power.c

   1 /*
   2  * PMU driver for Wolfson Microelectronics wm831x PMICs
   3  *
   4  * Copyright 2009 Wolfson Microelectronics PLC.
   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/module.h>
  12 #include <linux/err.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/power_supply.h>
  15 #include <linux/slab.h>
  16
  17 #include <linux/mfd/wm831x/core.h>
  18 #include <linux/mfd/wm831x/auxadc.h>
  19 #include <linux/mfd/wm831x/pmu.h>
  20 #include <linux/mfd/wm831x/pdata.h>
  21
  22 struct wm831x_power {
  23         struct wm831x *wm831x;
  24         struct power_supply wall;
  25         struct power_supply usb;
  26         struct power_supply battery;
  27         char wall_name[20];
  28         char usb_name[20];
  29         char battery_name[20];
  30         bool have_battery;
  31 };
  32
  33 static int wm831x_power_check_online(struct wm831x *wm831x, int supply,
  34                                      union power_supply_propval *val)
  35 {
  36         int ret;
  37
  38         ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
  39         if (ret < 0)
  40                 return ret;
  41
  42         if (ret & supply)
  43                 val->intval = 1;
  44         else
  45                 val->intval = 0;
  46
  47         return 0;
  48 }
  49
  50 static int wm831x_power_read_voltage(struct wm831x *wm831x,
  51                                      enum wm831x_auxadc src,
  52                                      union power_supply_propval *val)
  53 {
  54         int ret;
  55
  56         ret = wm831x_auxadc_read_uv(wm831x, src);
  57         if (ret >= 0)
  58                 val->intval = ret;
  59
  60         return ret;
  61 }
  62
  63 /*********************************************************************
  64  *              WALL Power
  65  *********************************************************************/
  66 static int wm831x_wall_get_prop(struct power_supply *psy,
  67                                 enum power_supply_property psp,
  68                                 union power_supply_propval *val)
  69 {
  70         struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
  71         struct wm831x *wm831x = wm831x_power->wm831x;
  72         int ret = 0;
  73
  74         switch (psp) {
  75         case POWER_SUPPLY_PROP_ONLINE:
  76                 ret = wm831x_power_check_online(wm831x, WM831X_PWR_WALL, val);
  77                 break;
  78         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  79                 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_WALL, val);
  80                 break;
  81         default:
  82                 ret = -EINVAL;
  83                 break;
  84         }
  85
  86         return ret;
  87 }
  88
  89 static enum power_supply_property wm831x_wall_props[] = {
  90         POWER_SUPPLY_PROP_ONLINE,
  91         POWER_SUPPLY_PROP_VOLTAGE_NOW,
  92 };
  93
  94 /*********************************************************************
  95  *              USB Power
  96  *********************************************************************/
  97 static int wm831x_usb_get_prop(struct power_supply *psy,
  98                                enum power_supply_property psp,
  99                                union power_supply_propval *val)
 100 {
 101         struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
 102         struct wm831x *wm831x = wm831x_power->wm831x;
 103         int ret = 0;
 104
 105         switch (psp) {
 106         case POWER_SUPPLY_PROP_ONLINE:
 107                 ret = wm831x_power_check_online(wm831x, WM831X_PWR_USB, val);
 108                 break;
 109         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 110                 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_USB, val);
 111                 break;
 112         default:
 113                 ret = -EINVAL;
 114                 break;
 115         }
 116
 117         return ret;
 118 }
 119
 120 static enum power_supply_property wm831x_usb_props[] = {
 121         POWER_SUPPLY_PROP_ONLINE,
 122         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 123 };
 124
 125 /*********************************************************************
 126  *              Battery properties
 127  *********************************************************************/
 128
 129 struct chg_map {
 130         int val;
 131         int reg_val;
 132 };
 133
 134 static struct chg_map trickle_ilims[] = {
 135         {  50, 0 << WM831X_CHG_TRKL_ILIM_SHIFT },
 136         { 100, 1 << WM831X_CHG_TRKL_ILIM_SHIFT },
 137         { 150, 2 << WM831X_CHG_TRKL_ILIM_SHIFT },
 138         { 200, 3 << WM831X_CHG_TRKL_ILIM_SHIFT },
 139 };
 140
 141 static struct chg_map vsels[] = {
 142         { 4050, 0 << WM831X_CHG_VSEL_SHIFT },
 143         { 4100, 1 << WM831X_CHG_VSEL_SHIFT },
 144         { 4150, 2 << WM831X_CHG_VSEL_SHIFT },
 145         { 4200, 3 << WM831X_CHG_VSEL_SHIFT },
 146 };
 147
 148 static struct chg_map fast_ilims[] = {
 149         {    0,  0 << WM831X_CHG_FAST_ILIM_SHIFT },
 150         {   50,  1 << WM831X_CHG_FAST_ILIM_SHIFT },
 151         {  100,  2 << WM831X_CHG_FAST_ILIM_SHIFT },
 152         {  150,  3 << WM831X_CHG_FAST_ILIM_SHIFT },
 153         {  200,  4 << WM831X_CHG_FAST_ILIM_SHIFT },
 154         {  250,  5 << WM831X_CHG_FAST_ILIM_SHIFT },
 155         {  300,  6 << WM831X_CHG_FAST_ILIM_SHIFT },
 156         {  350,  7 << WM831X_CHG_FAST_ILIM_SHIFT },
 157         {  400,  8 << WM831X_CHG_FAST_ILIM_SHIFT },
 158         {  450,  9 << WM831X_CHG_FAST_ILIM_SHIFT },
 159         {  500, 10 << WM831X_CHG_FAST_ILIM_SHIFT },
 160         {  600, 11 << WM831X_CHG_FAST_ILIM_SHIFT },
 161         {  700, 12 << WM831X_CHG_FAST_ILIM_SHIFT },
 162         {  800, 13 << WM831X_CHG_FAST_ILIM_SHIFT },
 163         {  900, 14 << WM831X_CHG_FAST_ILIM_SHIFT },
 164         { 1000, 15 << WM831X_CHG_FAST_ILIM_SHIFT },
 165 };
 166
 167 static struct chg_map eoc_iterms[] = {
 168         { 20, 0 << WM831X_CHG_ITERM_SHIFT },
 169         { 30, 1 << WM831X_CHG_ITERM_SHIFT },
 170         { 40, 2 << WM831X_CHG_ITERM_SHIFT },
 171         { 50, 3 << WM831X_CHG_ITERM_SHIFT },
 172         { 60, 4 << WM831X_CHG_ITERM_SHIFT },
 173         { 70, 5 << WM831X_CHG_ITERM_SHIFT },
 174         { 80, 6 << WM831X_CHG_ITERM_SHIFT },
 175         { 90, 7 << WM831X_CHG_ITERM_SHIFT },
 176 };
 177
 178 static struct chg_map chg_times[] = {
 179         {  60,  0 << WM831X_CHG_TIME_SHIFT },
 180         {  90,  1 << WM831X_CHG_TIME_SHIFT },
 181         { 120,  2 << WM831X_CHG_TIME_SHIFT },
 182         { 150,  3 << WM831X_CHG_TIME_SHIFT },
 183         { 180,  4 << WM831X_CHG_TIME_SHIFT },
 184         { 210,  5 << WM831X_CHG_TIME_SHIFT },
 185         { 240,  6 << WM831X_CHG_TIME_SHIFT },
 186         { 270,  7 << WM831X_CHG_TIME_SHIFT },
 187         { 300,  8 << WM831X_CHG_TIME_SHIFT },
 188         { 330,  9 << WM831X_CHG_TIME_SHIFT },
 189         { 360, 10 << WM831X_CHG_TIME_SHIFT },
 190         { 390, 11 << WM831X_CHG_TIME_SHIFT },
 191         { 420, 12 << WM831X_CHG_TIME_SHIFT },
 192         { 450, 13 << WM831X_CHG_TIME_SHIFT },
 193         { 480, 14 << WM831X_CHG_TIME_SHIFT },
 194         { 510, 15 << WM831X_CHG_TIME_SHIFT },
 195 };
 196
 197 static void wm831x_battey_apply_config(struct wm831x *wm831x,
 198                                        struct chg_map *map, int count, int val,
 199                                        int *reg, const char *name,
 200                                        const char *units)
 201 {
 202         int i;
 203
 204         for (i = 0; i < count; i++)
 205                 if (val == map[i].val)
 206                         break;
 207         if (i == count) {
 208                 dev_err(wm831x->dev, "Invalid %s %d%s\n",
 209                         name, val, units);
 210         } else {
 211                 *reg |= map[i].reg_val;
 212                 dev_dbg(wm831x->dev, "Set %s of %d%s\n", name, val, units);
 213         }
 214 }
 215
 216 static void wm831x_config_battery(struct wm831x *wm831x)
 217 {
 218         struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
 219         struct wm831x_battery_pdata *pdata;
 220         int ret, reg1, reg2;
 221
 222         if (!wm831x_pdata || !wm831x_pdata->battery) {
 223                 dev_warn(wm831x->dev,
 224                          "No battery charger configuration\n");
 225                 return;
 226         }
 227
 228         pdata = wm831x_pdata->battery;
 229
 230         reg1 = 0;
 231         reg2 = 0;
 232
 233         if (!pdata->enable) {
 234                 dev_info(wm831x->dev, "Battery charger disabled\n");
 235                 return;
 236         }
 237
 238         reg1 |= WM831X_CHG_ENA;
 239         if (pdata->off_mask)
 240                 reg2 |= WM831X_CHG_OFF_MSK;
 241         if (pdata->fast_enable)
 242                 reg1 |= WM831X_CHG_FAST;
 243
 244         wm831x_battey_apply_config(wm831x, trickle_ilims,
 245                                    ARRAY_SIZE(trickle_ilims),
 246                                    pdata->trickle_ilim, &reg2,
 247                                    "trickle charge current limit", "mA");
 248
 249         wm831x_battey_apply_config(wm831x, vsels, ARRAY_SIZE(vsels),
 250                                    pdata->vsel, &reg2,
 251                                    "target voltage", "mV");
 252
 253         wm831x_battey_apply_config(wm831x, fast_ilims, ARRAY_SIZE(fast_ilims),
 254                                    pdata->fast_ilim, &reg2,
 255                                    "fast charge current limit", "mA");
 256
 257         wm831x_battey_apply_config(wm831x, eoc_iterms, ARRAY_SIZE(eoc_iterms),
 258                                    pdata->eoc_iterm, &reg1,
 259                                    "end of charge current threshold", "mA");
 260
 261         wm831x_battey_apply_config(wm831x, chg_times, ARRAY_SIZE(chg_times),
 262                                    pdata->timeout, &reg2,
 263                                    "charger timeout", "min");
 264
 265         ret = wm831x_reg_unlock(wm831x);
 266         if (ret != 0) {
 267                 dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret);
 268                 return;
 269         }
 270
 271         ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_1,
 272                               WM831X_CHG_ENA_MASK |
 273                               WM831X_CHG_FAST_MASK |
 274                               WM831X_CHG_ITERM_MASK,
 275                               reg1);
 276         if (ret != 0)
 277                 dev_err(wm831x->dev, "Failed to set charger control 1: %d\n",
 278                         ret);
 279
 280         ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_2,
 281                               WM831X_CHG_OFF_MSK |
 282                               WM831X_CHG_TIME_MASK |
 283                               WM831X_CHG_FAST_ILIM_MASK |
 284                               WM831X_CHG_TRKL_ILIM_MASK |
 285                               WM831X_CHG_VSEL_MASK,
 286                               reg2);
 287         if (ret != 0)
 288                 dev_err(wm831x->dev, "Failed to set charger control 2: %d\n",
 289                         ret);
 290
 291         wm831x_reg_lock(wm831x);
 292 }
 293
 294 static int wm831x_bat_check_status(struct wm831x *wm831x, int *status)
 295 {
 296         int ret;
 297
 298         ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
 299         if (ret < 0)
 300                 return ret;
 301
 302         if (ret & WM831X_PWR_SRC_BATT) {
 303                 *status = POWER_SUPPLY_STATUS_DISCHARGING;
 304                 return 0;
 305         }
 306
 307         ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
 308         if (ret < 0)
 309                 return ret;
 310
 311         switch (ret & WM831X_CHG_STATE_MASK) {
 312         case WM831X_CHG_STATE_OFF:
 313                 *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 314                 break;
 315         case WM831X_CHG_STATE_TRICKLE:
 316         case WM831X_CHG_STATE_FAST:
 317                 *status = POWER_SUPPLY_STATUS_CHARGING;
 318                 break;
 319
 320         default:
 321                 *status = POWER_SUPPLY_STATUS_UNKNOWN;
 322                 break;
 323         }
 324
 325         return 0;
 326 }
 327
 328 static int wm831x_bat_check_type(struct wm831x *wm831x, int *type)
 329 {
 330         int ret;
 331
 332         ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
 333         if (ret < 0)
 334                 return ret;
 335
 336         switch (ret & WM831X_CHG_STATE_MASK) {
 337         case WM831X_CHG_STATE_TRICKLE:
 338         case WM831X_CHG_STATE_TRICKLE_OT:
 339                 *type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
 340                 break;
 341         case WM831X_CHG_STATE_FAST:
 342         case WM831X_CHG_STATE_FAST_OT:
 343                 *type = POWER_SUPPLY_CHARGE_TYPE_FAST;
 344                 break;
 345         default:
 346                 *type = POWER_SUPPLY_CHARGE_TYPE_NONE;
 347                 break;
 348         }
 349
 350         return 0;
 351 }
 352
 353 static int wm831x_bat_check_health(struct wm831x *wm831x, int *health)
 354 {
 355         int ret;
 356
 357         ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
 358         if (ret < 0)
 359                 return ret;
 360
 361         if (ret & WM831X_BATT_HOT_STS) {
 362                 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
 363                 return 0;
 364         }
 365
 366         if (ret & WM831X_BATT_COLD_STS) {
 367                 *health = POWER_SUPPLY_HEALTH_COLD;
 368                 return 0;
 369         }
 370
 371         if (ret & WM831X_BATT_OV_STS) {
 372                 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 373                 return 0;
 374         }
 375
 376         switch (ret & WM831X_CHG_STATE_MASK) {
 377         case WM831X_CHG_STATE_TRICKLE_OT:
 378         case WM831X_CHG_STATE_FAST_OT:
 379                 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
 380                 break;
 381         case WM831X_CHG_STATE_DEFECTIVE:
 382                 *health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 383                 break;
 384         default:
 385                 *health = POWER_SUPPLY_HEALTH_GOOD;
 386                 break;
 387         }
 388
 389         return 0;
 390 }
 391
 392 static int wm831x_bat_get_prop(struct power_supply *psy,
 393                                enum power_supply_property psp,
 394                                union power_supply_propval *val)
 395 {
 396         struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
 397         struct wm831x *wm831x = wm831x_power->wm831x;
 398         int ret = 0;
 399
 400         switch (psp) {
 401         case POWER_SUPPLY_PROP_STATUS:
 402                 ret = wm831x_bat_check_status(wm831x, &val->intval);
 403                 break;
 404         case POWER_SUPPLY_PROP_ONLINE:
 405                 ret = wm831x_power_check_online(wm831x, WM831X_PWR_SRC_BATT,
 406                                                 val);
 407                 break;
 408         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 409                 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_BATT, val);
 410                 break;
 411         case POWER_SUPPLY_PROP_HEALTH:
 412                 ret = wm831x_bat_check_health(wm831x, &val->intval);
 413                 break;
 414         case POWER_SUPPLY_PROP_CHARGE_TYPE:
 415                 ret = wm831x_bat_check_type(wm831x, &val->intval);
 416                 break;
 417         default:
 418                 ret = -EINVAL;
 419                 break;
 420         }
 421
 422         return ret;
 423 }
 424
 425 static enum power_supply_property wm831x_bat_props[] = {
 426         POWER_SUPPLY_PROP_STATUS,
 427         POWER_SUPPLY_PROP_ONLINE,
 428         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 429         POWER_SUPPLY_PROP_HEALTH,
 430         POWER_SUPPLY_PROP_CHARGE_TYPE,
 431 };
 432
 433 static const char *wm831x_bat_irqs[] = {
 434         "BATT HOT",
 435         "BATT COLD",
 436         "BATT FAIL",
 437         "OV",
 438         "END",
 439         "TO",
 440         "MODE",
 441         "START",
 442 };
 443
 444 static irqreturn_t wm831x_bat_irq(int irq, void *data)
 445 {
 446         struct wm831x_power *wm831x_power = data;
 447         struct wm831x *wm831x = wm831x_power->wm831x;
 448
 449         dev_dbg(wm831x->dev, "Battery status changed: %d\n", irq);
 450
 451         /* The battery charger is autonomous so we don't need to do
 452          * anything except kick user space */
 453         if (wm831x_power->have_battery)
 454                 power_supply_changed(&wm831x_power->battery);
 455
 456         return IRQ_HANDLED;
 457 }
 458
 459
 460 /*********************************************************************
 461  *              Initialisation
 462  *********************************************************************/
 463
 464 static irqreturn_t wm831x_syslo_irq(int irq, void *data)
 465 {
 466         struct wm831x_power *wm831x_power = data;
 467         struct wm831x *wm831x = wm831x_power->wm831x;
 468
 469         /* Not much we can actually *do* but tell people for
 470          * posterity, we're probably about to run out of power. */
 471         dev_crit(wm831x->dev, "SYSVDD under voltage\n");
 472
 473         return IRQ_HANDLED;
 474 }
 475
 476 static irqreturn_t wm831x_pwr_src_irq(int irq, void *data)
 477 {
 478         struct wm831x_power *wm831x_power = data;
 479         struct wm831x *wm831x = wm831x_power->wm831x;
 480
 481         dev_dbg(wm831x->dev, "Power source changed\n");
 482
 483         /* Just notify for everything - little harm in overnotifying. */
 484         if (wm831x_power->have_battery)
 485                 power_supply_changed(&wm831x_power->battery);
 486         power_supply_changed(&wm831x_power->usb);
 487         power_supply_changed(&wm831x_power->wall);
 488
 489         return IRQ_HANDLED;
 490 }
 491
 492 static __devinit int wm831x_power_probe(struct platform_device *pdev)
 493 {
 494         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 495         struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
 496         struct wm831x_power *power;
 497         struct power_supply *usb;
 498         struct power_supply *battery;
 499         struct power_supply *wall;
 500         int ret, irq, i;
 501
 502         power = kzalloc(sizeof(struct wm831x_power), GFP_KERNEL);
 503         if (power == NULL)
 504                 return -ENOMEM;
 505
 506         power->wm831x = wm831x;
 507         platform_set_drvdata(pdev, power);
 508
 509         usb = &power->usb;
 510         battery = &power->battery;
 511         wall = &power->wall;
 512
 513         if (wm831x_pdata && wm831x_pdata->wm831x_num) {
 514                 snprintf(power->wall_name, sizeof(power->wall_name),
 515                          "wm831x-wall.%d", wm831x_pdata->wm831x_num);
 516                 snprintf(power->battery_name, sizeof(power->wall_name),
 517                          "wm831x-battery.%d", wm831x_pdata->wm831x_num);
 518                 snprintf(power->usb_name, sizeof(power->wall_name),
 519                          "wm831x-usb.%d", wm831x_pdata->wm831x_num);
 520         } else {
 521                 snprintf(power->wall_name, sizeof(power->wall_name),
 522                          "wm831x-wall");
 523                 snprintf(power->battery_name, sizeof(power->wall_name),
 524                          "wm831x-battery");
 525                 snprintf(power->usb_name, sizeof(power->wall_name),
 526                          "wm831x-usb");
 527         }
 528
 529         /* We ignore configuration failures since we can still read back
 530          * the status without enabling the charger.
 531          */
 532         wm831x_config_battery(wm831x);
 533
 534         wall->name = power->wall_name;
 535         wall->type = POWER_SUPPLY_TYPE_MAINS;
 536         wall->properties = wm831x_wall_props;
 537         wall->num_properties = ARRAY_SIZE(wm831x_wall_props);
 538         wall->get_property = wm831x_wall_get_prop;
 539         ret = power_supply_register(&pdev->dev, wall);
 540         if (ret)
 541                 goto err_kmalloc;
 542
 543         usb->name = power->usb_name,
 544         usb->type = POWER_SUPPLY_TYPE_USB;
 545         usb->properties = wm831x_usb_props;
 546         usb->num_properties = ARRAY_SIZE(wm831x_usb_props);
 547         usb->get_property = wm831x_usb_get_prop;
 548         ret = power_supply_register(&pdev->dev, usb);
 549         if (ret)
 550                 goto err_wall;
 551
 552         ret = wm831x_reg_read(wm831x, WM831X_CHARGER_CONTROL_1);
 553         if (ret < 0)
 554                 goto err_wall;
 555         power->have_battery = ret & WM831X_CHG_ENA;
 556
 557         if (power->have_battery) {
 558                     battery->name = power->battery_name;
 559                     battery->properties = wm831x_bat_props;
 560                     battery->num_properties = ARRAY_SIZE(wm831x_bat_props);
 561                     battery->get_property = wm831x_bat_get_prop;
 562                     battery->use_for_apm = 1;
 563                     ret = power_supply_register(&pdev->dev, battery);
 564                     if (ret)
 565                             goto err_usb;
 566         }
 567
 568         irq = platform_get_irq_byname(pdev, "SYSLO");
 569         ret = request_threaded_irq(irq, NULL, wm831x_syslo_irq,
 570                                    IRQF_TRIGGER_RISING, "System power low",
 571                                    power);
 572         if (ret != 0) {
 573                 dev_err(&pdev->dev, "Failed to request SYSLO IRQ %d: %d\n",
 574                         irq, ret);
 575                 goto err_battery;
 576         }
 577
 578         irq = platform_get_irq_byname(pdev, "PWR SRC");
 579         ret = request_threaded_irq(irq, NULL, wm831x_pwr_src_irq,
 580                                    IRQF_TRIGGER_RISING, "Power source",
 581                                    power);
 582         if (ret != 0) {
 583                 dev_err(&pdev->dev, "Failed to request PWR SRC IRQ %d: %d\n",
 584                         irq, ret);
 585                 goto err_syslo;
 586         }
 587
 588         for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
 589                 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
 590                 ret = request_threaded_irq(irq, NULL, wm831x_bat_irq,
 591                                            IRQF_TRIGGER_RISING,
 592                                            wm831x_bat_irqs[i],
 593                                            power);
 594                 if (ret != 0) {
 595                         dev_err(&pdev->dev,
 596                                 "Failed to request %s IRQ %d: %d\n",
 597                                 wm831x_bat_irqs[i], irq, ret);
 598                         goto err_bat_irq;
 599                 }
 600         }
 601
 602         return ret;
 603
 604 err_bat_irq:
 605         for (; i >= 0; i--) {
 606                 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
 607                 free_irq(irq, power);
 608         }
 609         irq = platform_get_irq_byname(pdev, "PWR SRC");
 610         free_irq(irq, power);
 611 err_syslo:
 612         irq = platform_get_irq_byname(pdev, "SYSLO");
 613         free_irq(irq, power);
 614 err_battery:
 615         if (power->have_battery)
 616                 power_supply_unregister(battery);
 617 err_usb:
 618         power_supply_unregister(usb);
 619 err_wall:
 620         power_supply_unregister(wall);
 621 err_kmalloc:
 622         kfree(power);
 623         return ret;
 624 }
 625
 626 static __devexit int wm831x_power_remove(struct platform_device *pdev)
 627 {
 628         struct wm831x_power *wm831x_power = platform_get_drvdata(pdev);
 629         int irq, i;
 630
 631         for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
 632                 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
 633                 free_irq(irq, wm831x_power);
 634         }
 635
 636         irq = platform_get_irq_byname(pdev, "PWR SRC");
 637         free_irq(irq, wm831x_power);
 638
 639         irq = platform_get_irq_byname(pdev, "SYSLO");
 640         free_irq(irq, wm831x_power);
 641
 642         if (wm831x_power->have_battery)
 643                 power_supply_unregister(&wm831x_power->battery);
 644         power_supply_unregister(&wm831x_power->wall);
 645         power_supply_unregister(&wm831x_power->usb);
 646         kfree(wm831x_power);
 647         return 0;
 648 }
 649
 650 static struct platform_driver wm831x_power_driver = {
 651         .probe = wm831x_power_probe,
 652         .remove = __devexit_p(wm831x_power_remove),
 653         .driver = {
 654                 .name = "wm831x-power",
 655         },
 656 };
 657
 658 module_platform_driver(wm831x_power_driver);
 659
 660 MODULE_DESCRIPTION("Power supply driver for WM831x PMICs");
 661 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 662 MODULE_LICENSE("GPL");
 663 MODULE_ALIAS("platform:wm831x-power");