Quelle  wm831x_power.c  Sprache: unbekannt

// SPDX-License-Identifier: GPL-2.0-only
/*
 * PMU driver for Wolfson Microelectronics wm831x PMICs
 *
 * Copyright 2009 Wolfson Microelectronics PLC.
 */

#include <linux/module.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
#include <linux/usb/phy.h>

#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/auxadc.h>
#include <linux/mfd/wm831x/pmu.h>
#include <linux/mfd/wm831x/pdata.h>

struct wm831x_power {
 struct wm831x *wm831x;
 struct power_supply *wall;
 struct power_supply *usb;
 struct power_supply *battery;
 struct power_supply_desc wall_desc;
 struct power_supply_desc usb_desc;
 struct power_supply_desc battery_desc;
 char wall_name[20];
 char usb_name[20];
 char battery_name[20];
 bool have_battery;
 struct usb_phy *usb_phy;
 struct notifier_block usb_notify;
};

static int wm831x_power_check_online(struct wm831x *wm831x, int supply,
         union power_supply_propval *val)
{
 int ret;

 ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
 if (ret < 0)
  return ret;

 if (ret & supply)
  val->intval = 1;
 else
  val->intval = 0;

 return 0;
}

static int wm831x_power_read_voltage(struct wm831x *wm831x,
         enum wm831x_auxadc src,
         union power_supply_propval *val)
{
 int ret;

 ret = wm831x_auxadc_read_uv(wm831x, src);
 if (ret >= 0)
  val->intval = ret;

 return ret;
}

/*********************************************************************
 *  WALL Power
 *********************************************************************/
static int wm831x_wall_get_prop(struct power_supply *psy,
    enum power_supply_property psp,
    union power_supply_propval *val)
{
 struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev.parent);
 struct wm831x *wm831x = wm831x_power->wm831x;
 int ret = 0;

 switch (psp) {
 case POWER_SUPPLY_PROP_ONLINE:
  ret = wm831x_power_check_online(wm831x, WM831X_PWR_WALL, val);
  break;
 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_WALL, val);
  break;
 default:
  ret = -EINVAL;
  break;
 }

 return ret;
}

static const enum power_supply_property wm831x_wall_props[] = {
 POWER_SUPPLY_PROP_ONLINE,
 POWER_SUPPLY_PROP_VOLTAGE_NOW,
};

/*********************************************************************
 *  USB Power
 *********************************************************************/
static int wm831x_usb_get_prop(struct power_supply *psy,
          enum power_supply_property psp,
          union power_supply_propval *val)
{
 struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev.parent);
 struct wm831x *wm831x = wm831x_power->wm831x;
 int ret = 0;

 switch (psp) {
 case POWER_SUPPLY_PROP_ONLINE:
  ret = wm831x_power_check_online(wm831x, WM831X_PWR_USB, val);
  break;
 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_USB, val);
  break;
 default:
  ret = -EINVAL;
  break;
 }

 return ret;
}

static const enum power_supply_property wm831x_usb_props[] = {
 POWER_SUPPLY_PROP_ONLINE,
 POWER_SUPPLY_PROP_VOLTAGE_NOW,
};

/* In milliamps */
static const unsigned int wm831x_usb_limits[] = {
 0,
 2,
 100,
 500,
 900,
 1500,
 1800,
 550,
};

static int wm831x_usb_limit_change(struct notifier_block *nb,
       unsigned long limit, void *data)
{
 struct wm831x_power *wm831x_power = container_of(nb,
        struct wm831x_power,
        usb_notify);
 unsigned int i, best;

 /* Find the highest supported limit */
 best = 0;
 for (i = 0; i < ARRAY_SIZE(wm831x_usb_limits); i++) {
  if (limit >= wm831x_usb_limits[i] &&
      wm831x_usb_limits[best] < wm831x_usb_limits[i])
   best = i;
 }

 dev_dbg(wm831x_power->wm831x->dev,
  "Limiting USB current to %umA", wm831x_usb_limits[best]);

 wm831x_set_bits(wm831x_power->wm831x, WM831X_POWER_STATE,
          WM831X_USB_ILIM_MASK, best);

 return 0;
}

/*********************************************************************
 *  Battery properties
 *********************************************************************/

struct chg_map {
 int val;
 int reg_val;
};

static const struct chg_map trickle_ilims[] = {
 {  50, 0 << WM831X_CHG_TRKL_ILIM_SHIFT },
 { 100, 1 << WM831X_CHG_TRKL_ILIM_SHIFT },
 { 150, 2 << WM831X_CHG_TRKL_ILIM_SHIFT },
 { 200, 3 << WM831X_CHG_TRKL_ILIM_SHIFT },
};

static const struct chg_map vsels[] = {
 { 4050, 0 << WM831X_CHG_VSEL_SHIFT },
 { 4100, 1 << WM831X_CHG_VSEL_SHIFT },
 { 4150, 2 << WM831X_CHG_VSEL_SHIFT },
 { 4200, 3 << WM831X_CHG_VSEL_SHIFT },
};

static const struct chg_map fast_ilims[] = {
 {    0,  0 << WM831X_CHG_FAST_ILIM_SHIFT },
 {   50,  1 << WM831X_CHG_FAST_ILIM_SHIFT },
 {  100,  2 << WM831X_CHG_FAST_ILIM_SHIFT },
 {  150,  3 << WM831X_CHG_FAST_ILIM_SHIFT },
 {  200,  4 << WM831X_CHG_FAST_ILIM_SHIFT },
 {  250,  5 << WM831X_CHG_FAST_ILIM_SHIFT },
 {  300,  6 << WM831X_CHG_FAST_ILIM_SHIFT },
 {  350,  7 << WM831X_CHG_FAST_ILIM_SHIFT },
 {  400,  8 << WM831X_CHG_FAST_ILIM_SHIFT },
 {  450,  9 << WM831X_CHG_FAST_ILIM_SHIFT },
 {  500, 10 << WM831X_CHG_FAST_ILIM_SHIFT },
 {  600, 11 << WM831X_CHG_FAST_ILIM_SHIFT },
 {  700, 12 << WM831X_CHG_FAST_ILIM_SHIFT },
 {  800, 13 << WM831X_CHG_FAST_ILIM_SHIFT },
 {  900, 14 << WM831X_CHG_FAST_ILIM_SHIFT },
 { 1000, 15 << WM831X_CHG_FAST_ILIM_SHIFT },
};

static const struct chg_map eoc_iterms[] = {
 { 20, 0 << WM831X_CHG_ITERM_SHIFT },
 { 30, 1 << WM831X_CHG_ITERM_SHIFT },
 { 40, 2 << WM831X_CHG_ITERM_SHIFT },
 { 50, 3 << WM831X_CHG_ITERM_SHIFT },
 { 60, 4 << WM831X_CHG_ITERM_SHIFT },
 { 70, 5 << WM831X_CHG_ITERM_SHIFT },
 { 80, 6 << WM831X_CHG_ITERM_SHIFT },
 { 90, 7 << WM831X_CHG_ITERM_SHIFT },
};

static const struct chg_map chg_times[] = {
 {  60,  0 << WM831X_CHG_TIME_SHIFT },
 {  90,  1 << WM831X_CHG_TIME_SHIFT },
 { 120,  2 << WM831X_CHG_TIME_SHIFT },
 { 150,  3 << WM831X_CHG_TIME_SHIFT },
 { 180,  4 << WM831X_CHG_TIME_SHIFT },
 { 210,  5 << WM831X_CHG_TIME_SHIFT },
 { 240,  6 << WM831X_CHG_TIME_SHIFT },
 { 270,  7 << WM831X_CHG_TIME_SHIFT },
 { 300,  8 << WM831X_CHG_TIME_SHIFT },
 { 330,  9 << WM831X_CHG_TIME_SHIFT },
 { 360, 10 << WM831X_CHG_TIME_SHIFT },
 { 390, 11 << WM831X_CHG_TIME_SHIFT },
 { 420, 12 << WM831X_CHG_TIME_SHIFT },
 { 450, 13 << WM831X_CHG_TIME_SHIFT },
 { 480, 14 << WM831X_CHG_TIME_SHIFT },
 { 510, 15 << WM831X_CHG_TIME_SHIFT },
};

static void wm831x_battery_apply_config(struct wm831x *wm831x,
           const struct chg_map *map, int count, int val,
           int *reg, const char *name,
           const char *units)
{
 int i;

 for (i = 0; i < count; i++)
  if (val == map[i].val)
   break;
 if (i == count) {
  dev_err(wm831x->dev, "Invalid %s %d%s\n",
   name, val, units);
 } else {
  *reg |= map[i].reg_val;
  dev_dbg(wm831x->dev, "Set %s of %d%s\n", name, val, units);
 }
}

static void wm831x_config_battery(struct wm831x *wm831x)
{
 struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
 struct wm831x_battery_pdata *pdata;
 int ret, reg1, reg2;

 if (!wm831x_pdata || !wm831x_pdata->battery) {
  dev_warn(wm831x->dev,
    "No battery charger configuration\n");
  return;
 }

 pdata = wm831x_pdata->battery;

 reg1 = 0;
 reg2 = 0;

 if (!pdata->enable) {
  dev_info(wm831x->dev, "Battery charger disabled\n");
  return;
 }

 reg1 |= WM831X_CHG_ENA;
 if (pdata->off_mask)
  reg2 |= WM831X_CHG_OFF_MSK;
 if (pdata->fast_enable)
  reg1 |= WM831X_CHG_FAST;

 wm831x_battery_apply_config(wm831x, trickle_ilims,
       ARRAY_SIZE(trickle_ilims),
       pdata->trickle_ilim, ®2,
       "trickle charge current limit", "mA");

 wm831x_battery_apply_config(wm831x, vsels, ARRAY_SIZE(vsels),
       pdata->vsel, ®2,
       "target voltage", "mV");

 wm831x_battery_apply_config(wm831x, fast_ilims, ARRAY_SIZE(fast_ilims),
       pdata->fast_ilim, ®2,
       "fast charge current limit", "mA");

 wm831x_battery_apply_config(wm831x, eoc_iterms, ARRAY_SIZE(eoc_iterms),
       pdata->eoc_iterm, ®1,
       "end of charge current threshold", "mA");

 wm831x_battery_apply_config(wm831x, chg_times, ARRAY_SIZE(chg_times),
       pdata->timeout, ®2,
       "charger timeout", "min");

 ret = wm831x_reg_unlock(wm831x);
 if (ret != 0) {
  dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret);
  return;
 }

 ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_1,
         WM831X_CHG_ENA_MASK |
         WM831X_CHG_FAST_MASK |
         WM831X_CHG_ITERM_MASK,
         reg1);
 if (ret != 0)
  dev_err(wm831x->dev, "Failed to set charger control 1: %d\n",
   ret);

 ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_2,
         WM831X_CHG_OFF_MSK |
         WM831X_CHG_TIME_MASK |
         WM831X_CHG_FAST_ILIM_MASK |
         WM831X_CHG_TRKL_ILIM_MASK |
         WM831X_CHG_VSEL_MASK,
         reg2);
 if (ret != 0)
  dev_err(wm831x->dev, "Failed to set charger control 2: %d\n",
   ret);

 wm831x_reg_lock(wm831x);
}

static int wm831x_bat_check_status(struct wm831x *wm831x, int *status)
{
 int ret;

 ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
 if (ret < 0)
  return ret;

 if (ret & WM831X_PWR_SRC_BATT) {
  *status = POWER_SUPPLY_STATUS_DISCHARGING;
  return 0;
 }

 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
 if (ret < 0)
  return ret;

 switch (ret & WM831X_CHG_STATE_MASK) {
 case WM831X_CHG_STATE_OFF:
  *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
  break;
 case WM831X_CHG_STATE_TRICKLE:
 case WM831X_CHG_STATE_FAST:
  *status = POWER_SUPPLY_STATUS_CHARGING;
  break;

 default:
  *status = POWER_SUPPLY_STATUS_UNKNOWN;
  break;
 }

 return 0;
}

static int wm831x_bat_check_type(struct wm831x *wm831x, int *type)
{
 int ret;

 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
 if (ret < 0)
  return ret;

 switch (ret & WM831X_CHG_STATE_MASK) {
 case WM831X_CHG_STATE_TRICKLE:
 case WM831X_CHG_STATE_TRICKLE_OT:
  *type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
  break;
 case WM831X_CHG_STATE_FAST:
 case WM831X_CHG_STATE_FAST_OT:
  *type = POWER_SUPPLY_CHARGE_TYPE_FAST;
  break;
 default:
  *type = POWER_SUPPLY_CHARGE_TYPE_NONE;
  break;
 }

 return 0;
}

static int wm831x_bat_check_health(struct wm831x *wm831x, int *health)
{
 int ret;

 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
 if (ret < 0)
  return ret;

 if (ret & WM831X_BATT_HOT_STS) {
  *health = POWER_SUPPLY_HEALTH_OVERHEAT;
  return 0;
 }

 if (ret & WM831X_BATT_COLD_STS) {
  *health = POWER_SUPPLY_HEALTH_COLD;
  return 0;
 }

 if (ret & WM831X_BATT_OV_STS) {
  *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
  return 0;
 }

 switch (ret & WM831X_CHG_STATE_MASK) {
 case WM831X_CHG_STATE_TRICKLE_OT:
 case WM831X_CHG_STATE_FAST_OT:
  *health = POWER_SUPPLY_HEALTH_OVERHEAT;
  break;
 case WM831X_CHG_STATE_DEFECTIVE:
  *health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
  break;
 default:
  *health = POWER_SUPPLY_HEALTH_GOOD;
  break;
 }

 return 0;
}

static int wm831x_bat_get_prop(struct power_supply *psy,
          enum power_supply_property psp,
          union power_supply_propval *val)
{
 struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev.parent);
 struct wm831x *wm831x = wm831x_power->wm831x;
 int ret = 0;

 switch (psp) {
 case POWER_SUPPLY_PROP_STATUS:
  ret = wm831x_bat_check_status(wm831x, &val->intval);
  break;
 case POWER_SUPPLY_PROP_ONLINE:
  ret = wm831x_power_check_online(wm831x, WM831X_PWR_SRC_BATT,
      val);
  break;
 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_BATT, val);
  break;
 case POWER_SUPPLY_PROP_HEALTH:
  ret = wm831x_bat_check_health(wm831x, &val->intval);
  break;
 case POWER_SUPPLY_PROP_CHARGE_TYPE:
  ret = wm831x_bat_check_type(wm831x, &val->intval);
  break;
 default:
  ret = -EINVAL;
  break;
 }

 return ret;
}

static const enum power_supply_property wm831x_bat_props[] = {
 POWER_SUPPLY_PROP_STATUS,
 POWER_SUPPLY_PROP_ONLINE,
 POWER_SUPPLY_PROP_VOLTAGE_NOW,
 POWER_SUPPLY_PROP_HEALTH,
 POWER_SUPPLY_PROP_CHARGE_TYPE,
};

static const char * const wm831x_bat_irqs[] = {
 "BATT HOT",
 "BATT COLD",
 "BATT FAIL",
 "OV",
 "END",
 "TO",
 "MODE",
 "START",
};

static irqreturn_t wm831x_bat_irq(int irq, void *data)
{
 struct wm831x_power *wm831x_power = data;
 struct wm831x *wm831x = wm831x_power->wm831x;

 dev_dbg(wm831x->dev, "Battery status changed: %d\n", irq);

 /* The battery charger is autonomous so we don't need to do
 * anything except kick user space */
 if (wm831x_power->have_battery)
  power_supply_changed(wm831x_power->battery);

 return IRQ_HANDLED;
}


/*********************************************************************
 *  Initialisation
 *********************************************************************/

static irqreturn_t wm831x_syslo_irq(int irq, void *data)
{
 struct wm831x_power *wm831x_power = data;
 struct wm831x *wm831x = wm831x_power->wm831x;

 /* Not much we can actually *do* but tell people for
 * posterity, we're probably about to run out of power. */
 dev_crit(wm831x->dev, "SYSVDD under voltage\n");

 return IRQ_HANDLED;
}

static irqreturn_t wm831x_pwr_src_irq(int irq, void *data)
{
 struct wm831x_power *wm831x_power = data;
 struct wm831x *wm831x = wm831x_power->wm831x;

 dev_dbg(wm831x->dev, "Power source changed\n");

 /* Just notify for everything - little harm in overnotifying. */
 if (wm831x_power->have_battery)
  power_supply_changed(wm831x_power->battery);
 power_supply_changed(wm831x_power->usb);
 power_supply_changed(wm831x_power->wall);

 return IRQ_HANDLED;
}

static int wm831x_power_probe(struct platform_device *pdev)
{
 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
 struct wm831x_power *power;
 int ret, irq, i;

 power = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_power),
        GFP_KERNEL);
 if (power == NULL)
  return -ENOMEM;

 power->wm831x = wm831x;
 platform_set_drvdata(pdev, power);

 if (wm831x_pdata && wm831x_pdata->wm831x_num) {
  snprintf(power->wall_name, sizeof(power->wall_name),
    "wm831x-wall.%d", wm831x_pdata->wm831x_num);
  snprintf(power->battery_name, sizeof(power->wall_name),
    "wm831x-battery.%d", wm831x_pdata->wm831x_num);
  snprintf(power->usb_name, sizeof(power->wall_name),
    "wm831x-usb.%d", wm831x_pdata->wm831x_num);
 } else {
  snprintf(power->wall_name, sizeof(power->wall_name),
    "wm831x-wall");
  snprintf(power->battery_name, sizeof(power->wall_name),
    "wm831x-battery");
  snprintf(power->usb_name, sizeof(power->wall_name),
    "wm831x-usb");
 }

 /* We ignore configuration failures since we can still read back
  * the status without enabling the charger.
 */
 wm831x_config_battery(wm831x);

 power->wall_desc.name = power->wall_name;
 power->wall_desc.type = POWER_SUPPLY_TYPE_MAINS;
 power->wall_desc.properties = wm831x_wall_props;
 power->wall_desc.num_properties = ARRAY_SIZE(wm831x_wall_props);
 power->wall_desc.get_property = wm831x_wall_get_prop;
 power->wall = devm_power_supply_register(&pdev->dev,
       &power->wall_desc,
       NULL);
 if (IS_ERR(power->wall)) {
  ret = PTR_ERR(power->wall);
  goto err;
 }

 power->usb_desc.name = power->usb_name,
 power->usb_desc.type = POWER_SUPPLY_TYPE_USB;
 power->usb_desc.properties = wm831x_usb_props;
 power->usb_desc.num_properties = ARRAY_SIZE(wm831x_usb_props);
 power->usb_desc.get_property = wm831x_usb_get_prop;
 power->usb = devm_power_supply_register(&pdev->dev,
      &power->usb_desc,
      NULL);
 if (IS_ERR(power->usb)) {
  ret = PTR_ERR(power->usb);
  goto err_wall;
 }

 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_CONTROL_1);
 if (ret < 0)
  goto err_wall;
 power->have_battery = ret & WM831X_CHG_ENA;

 if (power->have_battery) {
  power->battery_desc.name = power->battery_name;
  power->battery_desc.properties = wm831x_bat_props;
  power->battery_desc.num_properties = ARRAY_SIZE(wm831x_bat_props);
  power->battery_desc.get_property = wm831x_bat_get_prop;
  power->battery_desc.use_for_apm = 1;
  power->battery = devm_power_supply_register(&pdev->dev,
           &power->battery_desc,
           NULL);
  if (IS_ERR(power->battery)) {
   ret = PTR_ERR(power->battery);
   goto err_usb;
  }
 }

 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "SYSLO"));
 ret = request_threaded_irq(irq, NULL, wm831x_syslo_irq,
       IRQF_TRIGGER_RISING | IRQF_ONESHOT, "System power low",
       power);
 if (ret != 0) {
  dev_err(&pdev->dev, "Failed to request SYSLO IRQ %d: %d\n",
   irq, ret);
  goto err_battery;
 }

 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "PWR SRC"));
 ret = request_threaded_irq(irq, NULL, wm831x_pwr_src_irq,
       IRQF_TRIGGER_RISING | IRQF_ONESHOT, "Power source",
       power);
 if (ret != 0) {
  dev_err(&pdev->dev, "Failed to request PWR SRC IRQ %d: %d\n",
   irq, ret);
  goto err_syslo;
 }

 for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
  irq = wm831x_irq(wm831x,
     platform_get_irq_byname(pdev,
        wm831x_bat_irqs[i]));
  ret = request_threaded_irq(irq, NULL, wm831x_bat_irq,
        IRQF_TRIGGER_RISING | IRQF_ONESHOT,
        wm831x_bat_irqs[i],
        power);
  if (ret != 0) {
   dev_err(&pdev->dev,
    "Failed to request %s IRQ %d: %d\n",
    wm831x_bat_irqs[i], irq, ret);
   goto err_bat_irq;
  }
 }

 power->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "phys", 0);
 ret = PTR_ERR_OR_ZERO(power->usb_phy);

 switch (ret) {
 case 0:
  power->usb_notify.notifier_call = wm831x_usb_limit_change;
  ret = usb_register_notifier(power->usb_phy, &power->usb_notify);
  if (ret) {
   dev_err(&pdev->dev, "Failed to register notifier: %d\n",
    ret);
   goto err_bat_irq;
  }
  break;
 case -EINVAL:
 case -ENODEV:
  /* ignore missing usb-phy, it's optional */
  power->usb_phy = NULL;
  ret = 0;
  break;
 default:
  dev_err(&pdev->dev, "Failed to find USB phy: %d\n", ret);
  fallthrough;
 case -EPROBE_DEFER:
  goto err_bat_irq;
 }

 return ret;

err_bat_irq:
 --i;
 for (; i >= 0; i--) {
  irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
  free_irq(irq, power);
 }
 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "PWR SRC"));
 free_irq(irq, power);
err_syslo:
 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "SYSLO"));
 free_irq(irq, power);
err_battery:
err_usb:
err_wall:
err:
 return ret;
}

static void wm831x_power_remove(struct platform_device *pdev)
{
 struct wm831x_power *wm831x_power = platform_get_drvdata(pdev);
 struct wm831x *wm831x = wm831x_power->wm831x;
 int irq, i;

 if (wm831x_power->usb_phy) {
  usb_unregister_notifier(wm831x_power->usb_phy,
     &wm831x_power->usb_notify);
 }

 for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
  irq = wm831x_irq(wm831x, 
     platform_get_irq_byname(pdev,
        wm831x_bat_irqs[i]));
  free_irq(irq, wm831x_power);
 }

 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "PWR SRC"));
 free_irq(irq, wm831x_power);

 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "SYSLO"));
 free_irq(irq, wm831x_power);
}

static struct platform_driver wm831x_power_driver = {
 .probe = wm831x_power_probe,
 .remove = wm831x_power_remove,
 .driver = {
  .name = "wm831x-power",
 },
};

module_platform_driver(wm831x_power_driver);

MODULE_DESCRIPTION("Power supply driver for WM831x PMICs");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm831x-power");