wm831x: Factor out WM831x backup battery charger

The backup battery on WM831x is a separate IP block to the main PMU
and is largely unrelated to the main supply functionality. Factor it
out into a separate driver in order to reflect this and better support
future hardware versions.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>

1 files changed, 3 insertions, 141 deletions

diff --git a/drivers/power/wm831x_power.c b/drivers/power/wm831x_power.c
index 2a4c8b0b829..f85e80b1b40 100644
--- a/drivers/power/wm831x_power.c
+++ b/drivers/power/wm831x_power.c
@@ -21,7 +21,6 @@
 struct wm831x_power {
         struct wm831x *wm831x;
         struct power_supply wall;
-        struct power_supply backup;
         struct power_supply usb;
         struct power_supply battery;
 };
@@ -454,125 +453,6 @@ static irqreturn_t wm831x_bat_irq(int irq, void *data)
 
 
 /*********************************************************************
- *              Backup supply properties
- *********************************************************************/
-
-static void wm831x_config_backup(struct wm831x *wm831x)
-{
-        struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
-        struct wm831x_backup_pdata *pdata;
-        int ret, reg;
-
-        if (!wm831x_pdata || !wm831x_pdata->backup) {
-                dev_warn(wm831x->dev,
-                         "No backup battery charger configuration\n");
-                return;
-        }
-
-        pdata = wm831x_pdata->backup;
-
-        reg = 0;
-
-        if (pdata->charger_enable)
-                reg |= WM831X_BKUP_CHG_ENA | WM831X_BKUP_BATT_DET_ENA;
-        if (pdata->no_constant_voltage)
-                reg |= WM831X_BKUP_CHG_MODE;
-
-        switch (pdata->vlim) {
-        case 2500:
-                break;
-        case 3100:
-                reg |= WM831X_BKUP_CHG_VLIM;
-                break;
-        default:
-                dev_err(wm831x->dev, "Invalid backup voltage limit %dmV\n",
-                        pdata->vlim);
-        }
-
-        switch (pdata->ilim) {
-        case 100:
-                break;
-        case 200:
-                reg |= 1;
-                break;
-        case 300:
-                reg |= 2;
-                break;
-        case 400:
-                reg |= 3;
-                break;
-        default:
-                dev_err(wm831x->dev, "Invalid backup current limit %duA\n",
-                        pdata->ilim);
-        }
-
-        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_BACKUP_CHARGER_CONTROL,
-                              WM831X_BKUP_CHG_ENA_MASK |
-                              WM831X_BKUP_CHG_MODE_MASK |
-                              WM831X_BKUP_BATT_DET_ENA_MASK |
-                              WM831X_BKUP_CHG_VLIM_MASK |
-                              WM831X_BKUP_CHG_ILIM_MASK,
-                              reg);
-        if (ret != 0)
-                dev_err(wm831x->dev,
-                        "Failed to set backup charger config: %d\n", ret);
-
-        wm831x_reg_lock(wm831x);
-}
-
-static int wm831x_backup_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;
-
-        ret = wm831x_reg_read(wm831x, WM831X_BACKUP_CHARGER_CONTROL);
-        if (ret < 0)
-                return ret;
-
-        switch (psp) {
-        case POWER_SUPPLY_PROP_STATUS:
-                if (ret & WM831X_BKUP_CHG_STS)
-                        val->intval = POWER_SUPPLY_STATUS_CHARGING;
-                else
-                        val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
-                break;
-
-        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
-                ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_BKUP_BATT,
-                                                val);
-                break;
-
-        case POWER_SUPPLY_PROP_PRESENT:
-                if (ret & WM831X_BKUP_CHG_STS)
-                        val->intval = 1;
-                else
-                        val->intval = 0;
-                break;
-
-        default:
-                ret = -EINVAL;
-                break;
-        }
-
-        return ret;
-}
-
-static enum power_supply_property wm831x_backup_props[] = {
-        POWER_SUPPLY_PROP_STATUS,
-        POWER_SUPPLY_PROP_VOLTAGE_NOW,
-        POWER_SUPPLY_PROP_PRESENT,
-};
-
-/*********************************************************************
  *              Initialisation
  *********************************************************************/
 
@@ -595,10 +475,7 @@ static irqreturn_t wm831x_pwr_src_irq(int irq, void *data)
 
         dev_dbg(wm831x->dev, "Power source changed\n");
 
-        /* Just notify for everything - little harm in overnotifying.
-         * The backup battery is not a power source while the system
-         * is running so skip that.
-         */
+        /* Just notify for everything - little harm in overnotifying. */
         power_supply_changed(&wm831x_power->battery);
         power_supply_changed(&wm831x_power->usb);
         power_supply_changed(&wm831x_power->wall);
@@ -613,7 +490,6 @@ static __devinit int wm831x_power_probe(struct platform_device *pdev)
         struct power_supply *usb;
         struct power_supply *battery;
         struct power_supply *wall;
-        struct power_supply *backup;
         int ret, irq, i;
 
         power = kzalloc(sizeof(struct wm831x_power), GFP_KERNEL);
@@ -626,13 +502,11 @@ static __devinit int wm831x_power_probe(struct platform_device *pdev)
         usb = &power->usb;
         battery = &power->battery;
         wall = &power->wall;
-        backup = &power->backup;
 
         /* We ignore configuration failures since we can still read back
-         * the status without enabling either of the chargers.
+         * the status without enabling the charger.
          */
         wm831x_config_battery(wm831x);
-        wm831x_config_backup(wm831x);
 
         wall->name = "wm831x-wall";
         wall->type = POWER_SUPPLY_TYPE_MAINS;
@@ -661,15 +535,6 @@ static __devinit int wm831x_power_probe(struct platform_device *pdev)
         if (ret)
                 goto err_battery;
 
-        backup->name = "wm831x-backup";
-        backup->type = POWER_SUPPLY_TYPE_BATTERY;
-        backup->properties = wm831x_backup_props;
-        backup->num_properties = ARRAY_SIZE(wm831x_backup_props);
-        backup->get_property = wm831x_backup_get_prop;
-        ret = power_supply_register(&pdev->dev, backup);
-        if (ret)
-                goto err_usb;
-
         irq = platform_get_irq_byname(pdev, "SYSLO");
         ret = wm831x_request_irq(wm831x, irq, wm831x_syslo_irq,
                                  IRQF_TRIGGER_RISING, "SYSLO",
@@ -677,7 +542,7 @@ static __devinit int wm831x_power_probe(struct platform_device *pdev)
         if (ret != 0) {
                 dev_err(&pdev->dev, "Failed to request SYSLO IRQ %d: %d\n",
                         irq, ret);
-                goto err_backup;
+                goto err_usb;
         }
 
         irq = platform_get_irq_byname(pdev, "PWR SRC");
@@ -716,8 +581,6 @@ err_bat_irq:
 err_syslo:
         irq = platform_get_irq_byname(pdev, "SYSLO");
         wm831x_free_irq(wm831x, irq, power);
-err_backup:
-        power_supply_unregister(backup);
 err_usb:
         power_supply_unregister(usb);
 err_battery:
@@ -746,7 +609,6 @@ static __devexit int wm831x_power_remove(struct platform_device *pdev)
         irq = platform_get_irq_byname(pdev, "SYSLO");
         wm831x_free_irq(wm831x, irq, wm831x_power);
 
-        power_supply_unregister(&wm831x_power->backup);
         power_supply_unregister(&wm831x_power->battery);
         power_supply_unregister(&wm831x_power->wall);
         power_supply_unregister(&wm831x_power->usb);