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 };
  28
  29 static int wm831x_power_check_online(struct wm831x *wm831x, int supply,
  30                                      union power_supply_propval *val)
  31 {
  32         int ret;
  33
  34         ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
  35         if (ret < 0)
  36                 return ret;
  37
  38         if (ret & supply)
  39                 val->intval = 1;
  40         else
  41                 val->intval = 0;
  42
  43         return 0;
  44 }
  45
  46 static int wm831x_power_read_voltage(struct wm831x *wm831x,
  47                                      enum wm831x_auxadc src,
  48                                      union power_supply_propval *val)
  49 {
  50         int ret;
  51
  52         ret = wm831x_auxadc_read_uv(wm831x, src);
  53         if (ret >= 0)
  54                 val->intval = ret;
  55
  56         return ret;
  57 }
  58
  59 /*********************************************************************
  60  *              WALL Power
  61  *********************************************************************/
  62 static int wm831x_wall_get_prop(struct power_supply *psy,
  63                                 enum power_supply_property psp,
  64                                 union power_supply_propval *val)
  65 {
  66         struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
  67         struct wm831x *wm831x = wm831x_power->wm831x;
  68         int ret = 0;
  69
  70         switch (psp) {
  71         case POWER_SUPPLY_PROP_ONLINE:
  72                 ret = wm831x_power_check_online(wm831x, WM831X_PWR_WALL, val);
  73                 break;
  74         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  75                 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_WALL, val);
  76                 break;
  77         default:
  78                 ret = -EINVAL;
  79                 break;
  80         }
  81
  82         return ret;
  83 }
  84
  85 static enum power_supply_property wm831x_wall_props[] = {
  86         POWER_SUPPLY_PROP_ONLINE,
  87         POWER_SUPPLY_PROP_VOLTAGE_NOW,
  88 };
  89
  90 /*********************************************************************
  91  *              USB Power
  92  *********************************************************************/
  93 static int wm831x_usb_get_prop(struct power_supply *psy,
  94                                enum power_supply_property psp,
  95                                union power_supply_propval *val)
  96 {
  97         struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
  98         struct wm831x *wm831x = wm831x_power->wm831x;
  99         int ret = 0;
 100
 101         switch (psp) {
 102         case POWER_SUPPLY_PROP_ONLINE:
 103                 ret = wm831x_power_check_online(wm831x, WM831X_PWR_USB, val);
 104                 break;
 105         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 106                 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_USB, val);
 107                 break;
 108         default:
 109                 ret = -EINVAL;
 110                 break;
 111         }
 112
 113         return ret;
 114 }
 115
 116 static enum power_supply_property wm831x_usb_props[] = {
 117         POWER_SUPPLY_PROP_ONLINE,
 118         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 119 };
 120
 121 /*********************************************************************
 122  *              Battery properties
 123  *********************************************************************/
 124
 125 struct chg_map {
 126         int val;
 127         int reg_val;
 128 };
 129
 130 static struct chg_map trickle_ilims[] = {
 131         {  50, 0 << WM831X_CHG_TRKL_ILIM_SHIFT },
 132         { 100, 1 << WM831X_CHG_TRKL_ILIM_SHIFT },
 133         { 150, 2 << WM831X_CHG_TRKL_ILIM_SHIFT },
 134         { 200, 3 << WM831X_CHG_TRKL_ILIM_SHIFT },
 135 };
 136
 137 static struct chg_map vsels[] = {
 138         { 4050, 0 << WM831X_CHG_VSEL_SHIFT },
 139         { 4100, 1 << WM831X_CHG_VSEL_SHIFT },
 140         { 4150, 2 << WM831X_CHG_VSEL_SHIFT },
 141         { 4200, 3 << WM831X_CHG_VSEL_SHIFT },
 142 };
 143
 144 static struct chg_map fast_ilims[] = {
 145         {    0,  0 << WM831X_CHG_FAST_ILIM_SHIFT },
 146         {   50,  1 << WM831X_CHG_FAST_ILIM_SHIFT },
 147         {  100,  2 << WM831X_CHG_FAST_ILIM_SHIFT },
 148         {  150,  3 << WM831X_CHG_FAST_ILIM_SHIFT },
 149         {  200,  4 << WM831X_CHG_FAST_ILIM_SHIFT },
 150         {  250,  5 << WM831X_CHG_FAST_ILIM_SHIFT },
 151         {  300,  6 << WM831X_CHG_FAST_ILIM_SHIFT },
 152         {  350,  7 << WM831X_CHG_FAST_ILIM_SHIFT },
 153         {  400,  8 << WM831X_CHG_FAST_ILIM_SHIFT },
 154         {  450,  9 << WM831X_CHG_FAST_ILIM_SHIFT },
 155         {  500, 10 << WM831X_CHG_FAST_ILIM_SHIFT },
 156         {  600, 11 << WM831X_CHG_FAST_ILIM_SHIFT },
 157         {  700, 12 << WM831X_CHG_FAST_ILIM_SHIFT },
 158         {  800, 13 << WM831X_CHG_FAST_ILIM_SHIFT },
 159         {  900, 14 << WM831X_CHG_FAST_ILIM_SHIFT },
 160         { 1000, 15 << WM831X_CHG_FAST_ILIM_SHIFT },
 161 };
 162
 163 static struct chg_map eoc_iterms[] = {
 164         { 20, 0 << WM831X_CHG_ITERM_SHIFT },
 165         { 30, 1 << WM831X_CHG_ITERM_SHIFT },
 166         { 40, 2 << WM831X_CHG_ITERM_SHIFT },
 167         { 50, 3 << WM831X_CHG_ITERM_SHIFT },
 168         { 60, 4 << WM831X_CHG_ITERM_SHIFT },
 169         { 70, 5 << WM831X_CHG_ITERM_SHIFT },
 170         { 80, 6 << WM831X_CHG_ITERM_SHIFT },
 171         { 90, 7 << WM831X_CHG_ITERM_SHIFT },
 172 };
 173
 174 static struct chg_map chg_times[] = {
 175         {  60,  0 << WM831X_CHG_TIME_SHIFT },
 176         {  90,  1 << WM831X_CHG_TIME_SHIFT },
 177         { 120,  2 << WM831X_CHG_TIME_SHIFT },
 178         { 150,  3 << WM831X_CHG_TIME_SHIFT },
 179         { 180,  4 << WM831X_CHG_TIME_SHIFT },
 180         { 210,  5 << WM831X_CHG_TIME_SHIFT },
 181         { 240,  6 << WM831X_CHG_TIME_SHIFT },
 182         { 270,  7 << WM831X_CHG_TIME_SHIFT },
 183         { 300,  8 << WM831X_CHG_TIME_SHIFT },
 184         { 330,  9 << WM831X_CHG_TIME_SHIFT },
 185         { 360, 10 << WM831X_CHG_TIME_SHIFT },
 186         { 390, 11 << WM831X_CHG_TIME_SHIFT },
 187         { 420, 12 << WM831X_CHG_TIME_SHIFT },
 188         { 450, 13 << WM831X_CHG_TIME_SHIFT },
 189         { 480, 14 << WM831X_CHG_TIME_SHIFT },
 190         { 510, 15 << WM831X_CHG_TIME_SHIFT },
 191 };
 192
 193 static void wm831x_battey_apply_config(struct wm831x *wm831x,
 194                                        struct chg_map *map, int count, int val,
 195                                        int *reg, const char *name,
 196                                        const char *units)
 197 {
 198         int i;
 199
 200         for (i = 0; i < count; i++)
 201                 if (val == map[i].val)
 202                         break;
 203         if (i == count) {
 204                 dev_err(wm831x->dev, "Invalid %s %d%s\n",
 205                         name, val, units);
 206         } else {
 207                 *reg |= map[i].reg_val;
 208                 dev_dbg(wm831x->dev, "Set %s of %d%s\n", name, val, units);
 209         }
 210 }
 211
 212 static void wm831x_config_battery(struct wm831x *wm831x)
 213 {
 214         struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
 215         struct wm831x_battery_pdata *pdata;
 216         int ret, reg1, reg2;
 217
 218         if (!wm831x_pdata || !wm831x_pdata->battery) {
 219                 dev_warn(wm831x->dev,
 220                          "No battery charger configuration\n");
 221                 return;
 222         }
 223
 224         pdata = wm831x_pdata->battery;
 225
 226         reg1 = 0;
 227         reg2 = 0;
 228
 229         if (!pdata->enable) {
 230                 dev_info(wm831x->dev, "Battery charger disabled\n");
 231                 return;
 232         }
 233
 234         reg1 |= WM831X_CHG_ENA;
 235         if (pdata->off_mask)
 236                 reg2 |= WM831X_CHG_OFF_MSK;
 237         if (pdata->fast_enable)
 238                 reg1 |= WM831X_CHG_FAST;
 239
 240         wm831x_battey_apply_config(wm831x, trickle_ilims,
 241                                    ARRAY_SIZE(trickle_ilims),
 242                                    pdata->trickle_ilim, &reg2,
 243                                    "trickle charge current limit", "mA");
 244
 245         wm831x_battey_apply_config(wm831x, vsels, ARRAY_SIZE(vsels),
 246                                    pdata->vsel, &reg2,
 247                                    "target voltage", "mV");
 248
 249         wm831x_battey_apply_config(wm831x, fast_ilims, ARRAY_SIZE(fast_ilims),
 250                                    pdata->fast_ilim, &reg2,
 251                                    "fast charge current limit", "mA");
 252
 253         wm831x_battey_apply_config(wm831x, eoc_iterms, ARRAY_SIZE(eoc_iterms),
 254                                    pdata->eoc_iterm, &reg1,
 255                                    "end of charge current threshold", "mA");
 256
 257         wm831x_battey_apply_config(wm831x, chg_times, ARRAY_SIZE(chg_times),
 258                                    pdata->timeout, &reg2,
 259                                    "charger timeout", "min");
 260
 261         ret = wm831x_reg_unlock(wm831x);
 262         if (ret != 0) {
 263                 dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret);
 264                 return;
 265         }
 266
 267         ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_1,
 268                               WM831X_CHG_ENA_MASK |
 269                               WM831X_CHG_FAST_MASK |
 270                               WM831X_CHG_ITERM_MASK,
 271                               reg1);
 272         if (ret != 0)
 273                 dev_err(wm831x->dev, "Failed to set charger control 1: %d\n",
 274                         ret);
 275
 276         ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_2,
 277                               WM831X_CHG_OFF_MSK |
 278                               WM831X_CHG_TIME_MASK |
 279                               WM831X_CHG_FAST_ILIM_MASK |
 280                               WM831X_CHG_TRKL_ILIM_MASK |
 281                               WM831X_CHG_VSEL_MASK,
 282                               reg2);
 283         if (ret != 0)
 284                 dev_err(wm831x->dev, "Failed to set charger control 2: %d\n",
 285                         ret);
 286
 287         wm831x_reg_lock(wm831x);
 288 }
 289
 290 static int wm831x_bat_check_status(struct wm831x *wm831x, int *status)
 291 {
 292         int ret;
 293
 294         ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
 295         if (ret < 0)
 296                 return ret;
 297
 298         if (ret & WM831X_PWR_SRC_BATT) {
 299                 *status = POWER_SUPPLY_STATUS_DISCHARGING;
 300                 return 0;
 301         }
 302
 303         ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
 304         if (ret < 0)
 305                 return ret;
 306
 307         switch (ret & WM831X_CHG_STATE_MASK) {
 308         case WM831X_CHG_STATE_OFF:
 309                 *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 310                 break;
 311         case WM831X_CHG_STATE_TRICKLE:
 312         case WM831X_CHG_STATE_FAST:
 313                 *status = POWER_SUPPLY_STATUS_CHARGING;
 314                 break;
 315
 316         default:
 317                 *status = POWER_SUPPLY_STATUS_UNKNOWN;
 318                 break;
 319         }
 320
 321         return 0;
 322 }
 323
 324 static int wm831x_bat_check_type(struct wm831x *wm831x, int *type)
 325 {
 326         int ret;
 327
 328         ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
 329         if (ret < 0)
 330                 return ret;
 331
 332         switch (ret & WM831X_CHG_STATE_MASK) {
 333         case WM831X_CHG_STATE_TRICKLE:
 334         case WM831X_CHG_STATE_TRICKLE_OT:
 335                 *type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
 336                 break;
 337         case WM831X_CHG_STATE_FAST:
 338         case WM831X_CHG_STATE_FAST_OT:
 339                 *type = POWER_SUPPLY_CHARGE_TYPE_FAST;
 340                 break;
 341         default:
 342                 *type = POWER_SUPPLY_CHARGE_TYPE_NONE;
 343                 break;
 344         }
 345
 346         return 0;
 347 }
 348
 349 static int wm831x_bat_check_health(struct wm831x *wm831x, int *health)
 350 {
 351         int ret;
 352
 353         ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
 354         if (ret < 0)
 355                 return ret;
 356
 357         if (ret & WM831X_BATT_HOT_STS) {
 358                 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
 359                 return 0;
 360         }
 361
 362         if (ret & WM831X_BATT_COLD_STS) {
 363                 *health = POWER_SUPPLY_HEALTH_COLD;
 364                 return 0;
 365         }
 366
 367         if (ret & WM831X_BATT_OV_STS) {
 368                 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 369                 return 0;
 370         }
 371
 372         switch (ret & WM831X_CHG_STATE_MASK) {
 373         case WM831X_CHG_STATE_TRICKLE_OT:
 374         case WM831X_CHG_STATE_FAST_OT:
 375                 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
 376                 break;
 377         case WM831X_CHG_STATE_DEFECTIVE:
 378                 *health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 379                 break;
 380         default:
 381                 *health = POWER_SUPPLY_HEALTH_GOOD;
 382                 break;
 383         }
 384
 385         return 0;
 386 }
 387
 388 static int wm831x_bat_get_prop(struct power_supply *psy,
 389                                enum power_supply_property psp,
 390                                union power_supply_propval *val)
 391 {
 392         struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
 393         struct wm831x *wm831x = wm831x_power->wm831x;
 394         int ret = 0;
 395
 396         switch (psp) {
 397         case POWER_SUPPLY_PROP_STATUS:
 398                 ret = wm831x_bat_check_status(wm831x, &val->intval);
 399                 break;
 400         case POWER_SUPPLY_PROP_ONLINE:
 401                 ret = wm831x_power_check_online(wm831x, WM831X_PWR_SRC_BATT,
 402                                                 val);
 403                 break;
 404         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 405                 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_BATT, val);
 406                 break;
 407         case POWER_SUPPLY_PROP_HEALTH:
 408                 ret = wm831x_bat_check_health(wm831x, &val->intval);
 409                 break;
 410         case POWER_SUPPLY_PROP_CHARGE_TYPE:
 411                 ret = wm831x_bat_check_type(wm831x, &val->intval);
 412                 break;
 413         default:
 414                 ret = -EINVAL;
 415                 break;
 416         }
 417
 418         return ret;
 419 }
 420
 421 static enum power_supply_property wm831x_bat_props[] = {
 422         POWER_SUPPLY_PROP_STATUS,
 423         POWER_SUPPLY_PROP_ONLINE,
 424         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 425         POWER_SUPPLY_PROP_HEALTH,
 426         POWER_SUPPLY_PROP_CHARGE_TYPE,
 427 };
 428
 429 static const char *wm831x_bat_irqs[] = {
 430         "BATT HOT",
 431         "BATT COLD",
 432         "BATT FAIL",
 433         "OV",
 434         "END",
 435         "TO",
 436         "MODE",
 437         "START",
 438 };
 439
 440 static irqreturn_t wm831x_bat_irq(int irq, void *data)
 441 {
 442         struct wm831x_power *wm831x_power = data;
 443         struct wm831x *wm831x = wm831x_power->wm831x;
 444
 445         dev_dbg(wm831x->dev, "Battery status changed: %d\n", irq);
 446
 447         /* The battery charger is autonomous so we don't need to do
 448          * anything except kick user space */
 449         power_supply_changed(&wm831x_power->battery);
 450
 451         return IRQ_HANDLED;
 452 }
 453
 454
 455 /*********************************************************************
 456  *              Initialisation
 457  *********************************************************************/
 458
 459 static irqreturn_t wm831x_syslo_irq(int irq, void *data)
 460 {
 461         struct wm831x_power *wm831x_power = data;
 462         struct wm831x *wm831x = wm831x_power->wm831x;
 463
 464         /* Not much we can actually *do* but tell people for
 465          * posterity, we're probably about to run out of power. */
 466         dev_crit(wm831x->dev, "SYSVDD under voltage\n");
 467
 468         return IRQ_HANDLED;
 469 }
 470
 471 static irqreturn_t wm831x_pwr_src_irq(int irq, void *data)
 472 {
 473         struct wm831x_power *wm831x_power = data;
 474         struct wm831x *wm831x = wm831x_power->wm831x;
 475
 476         dev_dbg(wm831x->dev, "Power source changed\n");
 477
 478         /* Just notify for everything - little harm in overnotifying. */
 479         power_supply_changed(&wm831x_power->battery);
 480         power_supply_changed(&wm831x_power->usb);
 481         power_supply_changed(&wm831x_power->wall);
 482
 483         return IRQ_HANDLED;
 484 }
 485
 486 static __devinit int wm831x_power_probe(struct platform_device *pdev)
 487 {
 488         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 489         struct wm831x_power *power;
 490         struct power_supply *usb;
 491         struct power_supply *battery;
 492         struct power_supply *wall;
 493         int ret, irq, i;
 494
 495         power = kzalloc(sizeof(struct wm831x_power), GFP_KERNEL);
 496         if (power == NULL)
 497                 return -ENOMEM;
 498
 499         power->wm831x = wm831x;
 500         platform_set_drvdata(pdev, power);
 501
 502         usb = &power->usb;
 503         battery = &power->battery;
 504         wall = &power->wall;
 505
 506         /* We ignore configuration failures since we can still read back
 507          * the status without enabling the charger.
 508          */
 509         wm831x_config_battery(wm831x);
 510
 511         wall->name = "wm831x-wall";
 512         wall->type = POWER_SUPPLY_TYPE_MAINS;
 513         wall->properties = wm831x_wall_props;
 514         wall->num_properties = ARRAY_SIZE(wm831x_wall_props);
 515         wall->get_property = wm831x_wall_get_prop;
 516         ret = power_supply_register(&pdev->dev, wall);
 517         if (ret)
 518                 goto err_kmalloc;
 519
 520         battery->name = "wm831x-battery";
 521         battery->properties = wm831x_bat_props;
 522         battery->num_properties = ARRAY_SIZE(wm831x_bat_props);
 523         battery->get_property = wm831x_bat_get_prop;
 524         battery->use_for_apm = 1;
 525         ret = power_supply_register(&pdev->dev, battery);
 526         if (ret)
 527                 goto err_wall;
 528
 529         usb->name = "wm831x-usb",
 530         usb->type = POWER_SUPPLY_TYPE_USB;
 531         usb->properties = wm831x_usb_props;
 532         usb->num_properties = ARRAY_SIZE(wm831x_usb_props);
 533         usb->get_property = wm831x_usb_get_prop;
 534         ret = power_supply_register(&pdev->dev, usb);
 535         if (ret)
 536                 goto err_battery;
 537
 538         irq = platform_get_irq_byname(pdev, "SYSLO");
 539         ret = request_threaded_irq(irq, NULL, wm831x_syslo_irq,
 540                                    IRQF_TRIGGER_RISING, "System power low",
 541                                    power);
 542         if (ret != 0) {
 543                 dev_err(&pdev->dev, "Failed to request SYSLO IRQ %d: %d\n",
 544                         irq, ret);
 545                 goto err_usb;
 546         }
 547
 548         irq = platform_get_irq_byname(pdev, "PWR SRC");
 549         ret = request_threaded_irq(irq, NULL, wm831x_pwr_src_irq,
 550                                    IRQF_TRIGGER_RISING, "Power source",
 551                                    power);
 552         if (ret != 0) {
 553                 dev_err(&pdev->dev, "Failed to request PWR SRC IRQ %d: %d\n",
 554                         irq, ret);
 555                 goto err_syslo;
 556         }
 557
 558         for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
 559                 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
 560                 ret = request_threaded_irq(irq, NULL, wm831x_bat_irq,
 561                                            IRQF_TRIGGER_RISING,
 562                                            wm831x_bat_irqs[i],
 563                                            power);
 564                 if (ret != 0) {
 565                         dev_err(&pdev->dev,
 566                                 "Failed to request %s IRQ %d: %d\n",
 567                                 wm831x_bat_irqs[i], irq, ret);
 568                         goto err_bat_irq;
 569                 }
 570         }
 571
 572         return ret;
 573
 574 err_bat_irq:
 575         for (; i >= 0; i--) {
 576                 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
 577                 free_irq(irq, power);
 578         }
 579         irq = platform_get_irq_byname(pdev, "PWR SRC");
 580         free_irq(irq, power);
 581 err_syslo:
 582         irq = platform_get_irq_byname(pdev, "SYSLO");
 583         free_irq(irq, power);
 584 err_usb:
 585         power_supply_unregister(usb);
 586 err_battery:
 587         power_supply_unregister(battery);
 588 err_wall:
 589         power_supply_unregister(wall);
 590 err_kmalloc:
 591         kfree(power);
 592         return ret;
 593 }
 594
 595 static __devexit int wm831x_power_remove(struct platform_device *pdev)
 596 {
 597         struct wm831x_power *wm831x_power = platform_get_drvdata(pdev);
 598         int irq, i;
 599
 600         for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
 601                 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
 602                 free_irq(irq, wm831x_power);
 603         }
 604
 605         irq = platform_get_irq_byname(pdev, "PWR SRC");
 606         free_irq(irq, wm831x_power);
 607
 608         irq = platform_get_irq_byname(pdev, "SYSLO");
 609         free_irq(irq, wm831x_power);
 610
 611         power_supply_unregister(&wm831x_power->battery);
 612         power_supply_unregister(&wm831x_power->wall);
 613         power_supply_unregister(&wm831x_power->usb);
 614         kfree(wm831x_power);
 615         return 0;
 616 }
 617
 618 static struct platform_driver wm831x_power_driver = {
 619         .probe = wm831x_power_probe,
 620         .remove = __devexit_p(wm831x_power_remove),
 621         .driver = {
 622                 .name = "wm831x-power",
 623         },
 624 };
 625
 626 static int __init wm831x_power_init(void)
 627 {
 628         return platform_driver_register(&wm831x_power_driver);
 629 }
 630 module_init(wm831x_power_init);
 631
 632 static void __exit wm831x_power_exit(void)
 633 {
 634         platform_driver_unregister(&wm831x_power_driver);
 635 }
 636 module_exit(wm831x_power_exit);
 637
 638 MODULE_DESCRIPTION("Power supply driver for WM831x PMICs");
 639 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 640 MODULE_LICENSE("GPL");
 641 MODULE_ALIAS("platform:wm831x-power");