Merge git://git.infradead.org/battery-2.6

* git://git.infradead.org/battery-2.6:
  power_supply_sysfs: Handle -ENODATA in a special way
  wm831x_backup: Remove unused variables
  gta02: Set pcf50633 charger_reference_current_ma
  pcf50633: Query charger status directly
  pcf50633: Properly reenable charging when the supply conditions change
  pcf50633: Get rid of charging restart software auto-triggering
  pcf50633: introduces battery charging current control
  pcf50633: Add ac power supply class to the charger
  wm831x: Factor out WM831x backup battery charger

6 files changed, 401 insertions, 217 deletions

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 118674925516..d4b3d67f0548 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -29,6 +29,13 @@ config APM_POWER
           Say Y here to enable support APM status emulation using
           battery class devices.
 
+config WM831X_BACKUP
+        tristate "WM831X backup battery charger support"
+        depends on MFD_WM831X
+        help
+          Say Y here to enable support for the backup battery charger
+          in the Wolfson Microelectronics WM831x PMICs.
+
 config WM831X_POWER
         tristate "WM831X PMU support"
         depends on MFD_WM831X
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 356cdfd3c8b2..573597c683b4 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_POWER_SUPPLY)	+= power_supply.o
 
 obj-$(CONFIG_PDA_POWER)         += pda_power.o
 obj-$(CONFIG_APM_POWER)         += apm_power.o
+obj-$(CONFIG_WM831X_BACKUP)     += wm831x_backup.o
 obj-$(CONFIG_WM831X_POWER)      += wm831x_power.o
 obj-$(CONFIG_WM8350_POWER)      += wm8350_power.o
 
diff --git a/drivers/power/pcf50633-charger.c b/drivers/power/pcf50633-charger.c
index 6a84a8eb8d7a..ea3fdfaca90d 100644
--- a/drivers/power/pcf50633-charger.c
+++ b/drivers/power/pcf50633-charger.c
@@ -29,15 +29,12 @@
 struct pcf50633_mbc {
         struct pcf50633 *pcf;
 
-        int adapter_active;
         int adapter_online;
-        int usb_active;
         int usb_online;
 
         struct power_supply usb;
         struct power_supply adapter;
-
-        struct delayed_work charging_restart_work;
+        struct power_supply ac;
 };
 
 int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma)
@@ -47,16 +44,21 @@ int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma)
         u8 bits;
         int charging_start = 1;
         u8 mbcs2, chgmod;
+        unsigned int mbcc5;
 
-        if (ma >= 1000)
+        if (ma >= 1000) {
                 bits = PCF50633_MBCC7_USB_1000mA;
-        else if (ma >= 500)
+                ma = 1000;
+        } else if (ma >= 500) {
                 bits = PCF50633_MBCC7_USB_500mA;
-        else if (ma >= 100)
+                ma = 500;
+        } else if (ma >= 100) {
                 bits = PCF50633_MBCC7_USB_100mA;
-        else {
+                ma = 100;
+        } else {
                 bits = PCF50633_MBCC7_USB_SUSPEND;
                 charging_start = 0;
+                ma = 0;
         }
 
         ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7,
@@ -66,21 +68,40 @@ int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma)
         else
                 dev_info(pcf->dev, "usb curlim to %d mA\n", ma);
 
-        /* Manual charging start */
-        mbcs2 = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
+        /*
+         * We limit the charging current to be the USB current limit.
+         * The reason is that on pcf50633, when it enters PMU Standby mode,
+         * which it does when the device goes "off", the USB current limit
+         * reverts to the variant default.  In at least one common case, that
+         * default is 500mA.  By setting the charging current to be the same
+         * as the USB limit we set here before PMU standby, we enforce it only
+         * using the correct amount of current even when the USB current limit
+         * gets reset to the wrong thing
+         */
+
+        if (mbc->pcf->pdata->charger_reference_current_ma) {
+                mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
+                if (mbcc5 > 255)
+                        mbcc5 = 255;
+                pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
+        }
+
+        mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
         chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
 
         /* If chgmod == BATFULL, setting chgena has no effect.
-         * We need to set resume instead.
+         * Datasheet says we need to set resume instead but when autoresume is
+         * used resume doesn't work. Clear and set chgena instead.
          */
         if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL)
                 pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
                                 PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
-        else
+        else {
+                pcf50633_reg_clear_bits(pcf, PCF50633_REG_MBCC1,
+                                PCF50633_MBCC1_CHGENA);
                 pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
-                                PCF50633_MBCC1_RESUME, PCF50633_MBCC1_RESUME);
-
-        mbc->usb_active = charging_start;
+                                PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
+        }
 
         power_supply_changed(&mbc->usb);
 
@@ -92,20 +113,44 @@ int pcf50633_mbc_get_status(struct pcf50633 *pcf)
 {
         struct pcf50633_mbc *mbc  = platform_get_drvdata(pcf->mbc_pdev);
         int status = 0;
+        u8 chgmod;
+
+        if (!mbc)
+                return 0;
+
+        chgmod = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2)
+                & PCF50633_MBCS2_MBC_MASK;
 
         if (mbc->usb_online)
                 status |= PCF50633_MBC_USB_ONLINE;
-        if (mbc->usb_active)
+        if (chgmod == PCF50633_MBCS2_MBC_USB_PRE ||
+            chgmod == PCF50633_MBCS2_MBC_USB_PRE_WAIT ||
+            chgmod == PCF50633_MBCS2_MBC_USB_FAST ||
+            chgmod == PCF50633_MBCS2_MBC_USB_FAST_WAIT)
                 status |= PCF50633_MBC_USB_ACTIVE;
         if (mbc->adapter_online)
                 status |= PCF50633_MBC_ADAPTER_ONLINE;
-        if (mbc->adapter_active)
+        if (chgmod == PCF50633_MBCS2_MBC_ADP_PRE ||
+            chgmod == PCF50633_MBCS2_MBC_ADP_PRE_WAIT ||
+            chgmod == PCF50633_MBCS2_MBC_ADP_FAST ||
+            chgmod == PCF50633_MBCS2_MBC_ADP_FAST_WAIT)
                 status |= PCF50633_MBC_ADAPTER_ACTIVE;
 
         return status;
 }
 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);
 
+int pcf50633_mbc_get_usb_online_status(struct pcf50633 *pcf)
+{
+        struct pcf50633_mbc *mbc  = platform_get_drvdata(pcf->mbc_pdev);
+
+        if (!mbc)
+                return 0;
+
+        return mbc->usb_online;
+}
+EXPORT_SYMBOL_GPL(pcf50633_mbc_get_usb_online_status);
+
 static ssize_t
 show_chgmode(struct device *dev, struct device_attribute *attr, char *buf)
 {
@@ -156,9 +201,55 @@ static ssize_t set_usblim(struct device *dev,
 
 static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);
 
+static ssize_t
+show_chglim(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
+        u8 mbcc5 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC5);
+        unsigned int ma;
+
+        if (!mbc->pcf->pdata->charger_reference_current_ma)
+                return -ENODEV;
+
+        ma = (mbc->pcf->pdata->charger_reference_current_ma *  mbcc5) >> 8;
+
+        return sprintf(buf, "%u\n", ma);
+}
+
+static ssize_t set_chglim(struct device *dev,
+                struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
+        unsigned long ma;
+        unsigned int mbcc5;
+        int ret;
+
+        if (!mbc->pcf->pdata->charger_reference_current_ma)
+                return -ENODEV;
+
+        ret = strict_strtoul(buf, 10, &ma);
+        if (ret)
+                return -EINVAL;
+
+        mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
+        if (mbcc5 > 255)
+                mbcc5 = 255;
+        pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
+
+        return count;
+}
+
+/*
+ * This attribute allows to change MBC charging limit on the fly
+ * independently of usb current limit. It also gets set automatically every
+ * time usb current limit is changed.
+ */
+static DEVICE_ATTR(chg_curlim, S_IRUGO | S_IWUSR, show_chglim, set_chglim);
+
 static struct attribute *pcf50633_mbc_sysfs_entries[] = {
         &dev_attr_chgmode.attr,
         &dev_attr_usb_curlim.attr,
+        &dev_attr_chg_curlim.attr,
         NULL,
 };
 
@@ -167,76 +258,26 @@ static struct attribute_group mbc_attr_group = {
         .attrs  = pcf50633_mbc_sysfs_entries,
 };
 
-/* MBC state machine switches into charging mode when the battery voltage
- * falls below 96% of a battery float voltage. But the voltage drop in Li-ion
- * batteries is marginal(1~2 %) till about 80% of its capacity - which means,
- * after a BATFULL, charging won't be restarted until 80%.
- *
- * This work_struct function restarts charging at regular intervals to make
- * sure we don't discharge too much
- */
-
-static void pcf50633_mbc_charging_restart(struct work_struct *work)
-{
-        struct pcf50633_mbc *mbc;
-        u8 mbcs2, chgmod;
-
-        mbc = container_of(work, struct pcf50633_mbc,
-                                charging_restart_work.work);
-
-        mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
-        chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
-
-        if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL)
-                return;
-
-        /* Restart charging */
-        pcf50633_reg_set_bit_mask(mbc->pcf, PCF50633_REG_MBCC1,
-                                PCF50633_MBCC1_RESUME, PCF50633_MBCC1_RESUME);
-        mbc->usb_active = 1;
-        power_supply_changed(&mbc->usb);
-
-        dev_info(mbc->pcf->dev, "Charging restarted\n");
-}
-
 static void
 pcf50633_mbc_irq_handler(int irq, void *data)
 {
         struct pcf50633_mbc *mbc = data;
-        int chg_restart_interval =
-                        mbc->pcf->pdata->charging_restart_interval;
 
         /* USB */
         if (irq == PCF50633_IRQ_USBINS) {
                 mbc->usb_online = 1;
         } else if (irq == PCF50633_IRQ_USBREM) {
                 mbc->usb_online = 0;
-                mbc->usb_active = 0;
                 pcf50633_mbc_usb_curlim_set(mbc->pcf, 0);
-                cancel_delayed_work_sync(&mbc->charging_restart_work);
         }
 
         /* Adapter */
-        if (irq == PCF50633_IRQ_ADPINS) {
+        if (irq == PCF50633_IRQ_ADPINS)
                 mbc->adapter_online = 1;
-                mbc->adapter_active = 1;
-        } else if (irq == PCF50633_IRQ_ADPREM) {
+        else if (irq == PCF50633_IRQ_ADPREM)
                 mbc->adapter_online = 0;
-                mbc->adapter_active = 0;
-        }
-
-        if (irq == PCF50633_IRQ_BATFULL) {
-                mbc->usb_active = 0;
-                mbc->adapter_active = 0;
-
-                if (chg_restart_interval > 0)
-                        schedule_delayed_work(&mbc->charging_restart_work,
-                                                        chg_restart_interval);
-        } else if (irq == PCF50633_IRQ_USBLIMON)
-                mbc->usb_active = 0;
-        else if (irq == PCF50633_IRQ_USBLIMOFF)
-                mbc->usb_active = 1;
 
+        power_supply_changed(&mbc->ac);
         power_supply_changed(&mbc->usb);
         power_supply_changed(&mbc->adapter);
 
@@ -269,10 +310,34 @@ static int usb_get_property(struct power_supply *psy,
 {
         struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, usb);
         int ret = 0;
+        u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
+                                                PCF50633_MBCC7_USB_MASK;
 
         switch (psp) {
         case POWER_SUPPLY_PROP_ONLINE:
-                val->intval = mbc->usb_online;
+                val->intval = mbc->usb_online &&
+                                (usblim <= PCF50633_MBCC7_USB_500mA);
+                break;
+        default:
+                ret = -EINVAL;
+                break;
+        }
+        return ret;
+}
+
+static int ac_get_property(struct power_supply *psy,
+                        enum power_supply_property psp,
+                        union power_supply_propval *val)
+{
+        struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, ac);
+        int ret = 0;
+        u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
+                                                PCF50633_MBCC7_USB_MASK;
+
+        switch (psp) {
+        case POWER_SUPPLY_PROP_ONLINE:
+                val->intval = mbc->usb_online &&
+                                (usblim == PCF50633_MBCC7_USB_1000mA);
                 break;
         default:
                 ret = -EINVAL;
@@ -336,6 +401,14 @@ static int __devinit pcf50633_mbc_probe(struct platform_device *pdev)
         mbc->usb.supplied_to            = mbc->pcf->pdata->batteries;
         mbc->usb.num_supplicants        = mbc->pcf->pdata->num_batteries;
 
+        mbc->ac.name                    = "ac";
+        mbc->ac.type                    = POWER_SUPPLY_TYPE_MAINS;
+        mbc->ac.properties              = power_props;
+        mbc->ac.num_properties          = ARRAY_SIZE(power_props);
+        mbc->ac.get_property            = ac_get_property;
+        mbc->ac.supplied_to             = mbc->pcf->pdata->batteries;
+        mbc->ac.num_supplicants         = mbc->pcf->pdata->num_batteries;
+
         ret = power_supply_register(&pdev->dev, &mbc->adapter);
         if (ret) {
                 dev_err(mbc->pcf->dev, "failed to register adapter\n");
@@ -351,8 +424,14 @@ static int __devinit pcf50633_mbc_probe(struct platform_device *pdev)
                 return ret;
         }
 
-        INIT_DELAYED_WORK(&mbc->charging_restart_work,
-                                pcf50633_mbc_charging_restart);
+        ret = power_supply_register(&pdev->dev, &mbc->ac);
+        if (ret) {
+                dev_err(mbc->pcf->dev, "failed to register ac\n");
+                power_supply_unregister(&mbc->adapter);
+                power_supply_unregister(&mbc->usb);
+                kfree(mbc);
+                return ret;
+        }
 
         ret = sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group);
         if (ret)
@@ -378,8 +457,7 @@ static int __devexit pcf50633_mbc_remove(struct platform_device *pdev)
 
         power_supply_unregister(&mbc->usb);
         power_supply_unregister(&mbc->adapter);
-
-        cancel_delayed_work_sync(&mbc->charging_restart_work);
+        power_supply_unregister(&mbc->ac);
 
         kfree(mbc);
 
diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c
index 08144393d64b..c790e0c77d4b 100644
--- a/drivers/power/power_supply_sysfs.c
+++ b/drivers/power/power_supply_sysfs.c
@@ -65,7 +65,10 @@ static ssize_t power_supply_show_property(struct device *dev,
         ret = psy->get_property(psy, off, &value);
 
         if (ret < 0) {
-                if (ret != -ENODEV)
+                if (ret == -ENODATA)
+                        dev_dbg(dev, "driver has no data for `%s' property\n",
+                                attr->attr.name);
+                else if (ret != -ENODEV)
                         dev_err(dev, "driver failed to report `%s' property\n",
                                 attr->attr.name);
                 return ret;
diff --git a/drivers/power/wm831x_backup.c b/drivers/power/wm831x_backup.c
new file mode 100644
index 000000000000..bf4f387a8009
--- /dev/null
+++ b/drivers/power/wm831x_backup.c
@@ -0,0 +1,233 @@
+/*
+ * Backup battery driver for Wolfson Microelectronics wm831x PMICs
+ *
+ * Copyright 2009 Wolfson Microelectronics PLC.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.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_backup {
+        struct wm831x *wm831x;
+        struct power_supply backup;
+};
+
+static int wm831x_backup_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;
+}
+
+/*********************************************************************
+ *              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_backup *devdata = dev_get_drvdata(psy->dev->parent);
+        struct wm831x *wm831x = devdata->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_backup_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
+ *********************************************************************/
+
+static __devinit int wm831x_backup_probe(struct platform_device *pdev)
+{
+        struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
+        struct wm831x_backup *devdata;
+        struct power_supply *backup;
+        int ret;
+
+        devdata = kzalloc(sizeof(struct wm831x_backup), GFP_KERNEL);
+        if (devdata == NULL)
+                return -ENOMEM;
+
+        devdata->wm831x = wm831x;
+        platform_set_drvdata(pdev, devdata);
+
+        backup = &devdata->backup;
+
+        /* We ignore configuration failures since we can still read
+         * back the status without enabling the charger (which may
+         * already be enabled anyway).
+         */
+        wm831x_config_backup(wm831x);
+
+        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_kmalloc;
+
+        return ret;
+
+err_kmalloc:
+        kfree(devdata);
+        return ret;
+}
+
+static __devexit int wm831x_backup_remove(struct platform_device *pdev)
+{
+        struct wm831x_backup *devdata = platform_get_drvdata(pdev);
+
+        power_supply_unregister(&devdata->backup);
+        kfree(devdata);
+
+        return 0;
+}
+
+static struct platform_driver wm831x_backup_driver = {
+        .probe = wm831x_backup_probe,
+        .remove = __devexit_p(wm831x_backup_remove),
+        .driver = {
+                .name = "wm831x-backup",
+        },
+};
+
+static int __init wm831x_backup_init(void)
+{
+        return platform_driver_register(&wm831x_backup_driver);
+}
+module_init(wm831x_backup_init);
+
+static void __exit wm831x_backup_exit(void)
+{
+        platform_driver_unregister(&wm831x_backup_driver);
+}
+module_exit(wm831x_backup_exit);
+
+MODULE_DESCRIPTION("Backup battery charger driver for WM831x PMICs");
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:wm831x-backup");
diff --git a/drivers/power/wm831x_power.c b/drivers/power/wm831x_power.c
index 2a4c8b0b829c..f85e80b1b400 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);