power: supply: wm97xx_battery: Convert to GPIO descriptor

This converts the WM97xx driver to use a GPIO descriptor
instead of passing a GPIO number thru platform data.

Like everything else in the driver, use a simple local
variable for the descriptor, it can only ever appear in
one instance anyway so it should not hurt.

After converting the driver I noticed that none of the
boardfiles actually define a meaningful GPIO line for
this, but hey, it is converted.

Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

arch/arm/mach-pxa/mioa701.c

@@ -577,7 +577,6 @@ static struct platform_device power_dev = {
 static struct wm97xx_batt_pdata mioa701_battery_data = {
 	.batt_aux	= WM97XX_AUX_ID1,
 	.temp_aux	= -1,
-	.charge_gpio	= -1,
 	.min_voltage	= 0xc00,
 	.max_voltage	= 0xfc0,
 	.batt_tech	= POWER_SUPPLY_TECHNOLOGY_LION,

arch/arm/mach-pxa/palm27x.c

@@ -212,7 +212,6 @@ void __init palm27x_irda_init(int pwdn)
 static struct wm97xx_batt_pdata palm27x_batt_pdata = {
 	.batt_aux	= WM97XX_AUX_ID3,
 	.temp_aux	= WM97XX_AUX_ID2,
-	.charge_gpio	= -1,
 	.batt_mult	= 1000,
 	.batt_div	= 414,
 	.temp_mult	= 1,

arch/arm/mach-pxa/palmte2.c

@@ -273,7 +273,6 @@ static struct platform_device power_supply = {
 static struct wm97xx_batt_pdata palmte2_batt_pdata = {
 	.batt_aux	= WM97XX_AUX_ID3,
 	.temp_aux	= WM97XX_AUX_ID2,
-	.charge_gpio	= -1,
 	.max_voltage	= PALMTE2_BAT_MAX_VOLTAGE,
 	.min_voltage	= PALMTE2_BAT_MIN_VOLTAGE,
 	.batt_mult	= 1000,

drivers/power/supply/wm97xx_battery.c

@@ -15,11 +15,12 @@
 #include <linux/wm97xx.h>
 #include <linux/spinlock.h>
 #include <linux/interrupt.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/irq.h>
 #include <linux/slab.h>
 
 static struct work_struct bat_work;
+static struct gpio_desc *charge_gpiod;
 static DEFINE_MUTEX(work_lock);
 static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
 static enum power_supply_property *prop;
@@ -96,12 +97,11 @@ static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
 static void wm97xx_bat_update(struct power_supply *bat_ps)
 {
 	int old_status = bat_status;
-	struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
 
 	mutex_lock(&work_lock);
 
-	bat_status = (pdata->charge_gpio >= 0) ?
-			(gpio_get_value(pdata->charge_gpio) ?
+	bat_status = (charge_gpiod) ?
+			(gpiod_get_value(charge_gpiod) ?
 			POWER_SUPPLY_STATUS_DISCHARGING :
 			POWER_SUPPLY_STATUS_CHARGING) :
 			POWER_SUPPLY_STATUS_UNKNOWN;
@@ -171,18 +171,19 @@ static int wm97xx_bat_probe(struct platform_device *dev)
 	if (dev->id != -1)
 		return -EINVAL;
 
-	if (gpio_is_valid(pdata->charge_gpio)) {
-		ret = gpio_request(pdata->charge_gpio, "BATT CHRG");
-		if (ret)
-			goto err;
-		ret = gpio_direction_input(pdata->charge_gpio);
-		if (ret)
-			goto err2;
-		ret = request_irq(gpio_to_irq(pdata->charge_gpio),
+	charge_gpiod = devm_gpiod_get_optional(&dev->dev, NULL, GPIOD_IN);
+	if (IS_ERR(charge_gpiod))
+		return dev_err_probe(&dev->dev,
+				     PTR_ERR(charge_gpiod),
+				     "failed to get charge GPIO\n");
+	if (charge_gpiod) {
+		gpiod_set_consumer_name(charge_gpiod, "BATT CHRG");
+		ret = request_irq(gpiod_to_irq(charge_gpiod),
 				wm97xx_chrg_irq, 0,
 				"AC Detect", dev);
 		if (ret)
-			goto err2;
+			return dev_err_probe(&dev->dev, ret,
+					     "failed to request GPIO irq\n");
 		props++;	/* POWER_SUPPLY_PROP_STATUS */
 	}
 
@@ -204,7 +205,7 @@ static int wm97xx_bat_probe(struct platform_device *dev)
 	}
 
 	prop[i++] = POWER_SUPPLY_PROP_PRESENT;
-	if (pdata->charge_gpio >= 0)
+	if (charge_gpiod)
 		prop[i++] = POWER_SUPPLY_PROP_STATUS;
 	if (pdata->batt_tech >= 0)
 		prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
@@ -242,23 +243,15 @@ static int wm97xx_bat_probe(struct platform_device *dev)
 err4:
 	kfree(prop);
 err3:
-	if (gpio_is_valid(pdata->charge_gpio))
-		free_irq(gpio_to_irq(pdata->charge_gpio), dev);
-err2:
-	if (gpio_is_valid(pdata->charge_gpio))
-		gpio_free(pdata->charge_gpio);
-err:
+	if (charge_gpiod)
+		free_irq(gpiod_to_irq(charge_gpiod), dev);
 	return ret;
 }
 
 static int wm97xx_bat_remove(struct platform_device *dev)
 {
-	struct wm97xx_batt_pdata *pdata = dev->dev.platform_data;
-
-	if (pdata && gpio_is_valid(pdata->charge_gpio)) {
-		free_irq(gpio_to_irq(pdata->charge_gpio), dev);
-		gpio_free(pdata->charge_gpio);
-	}
+	if (charge_gpiod)
+		free_irq(gpiod_to_irq(charge_gpiod), dev);
 	cancel_work_sync(&bat_work);
 	power_supply_unregister(bat_psy);
 	kfree(prop);

include/linux/wm97xx.h

@@ -294,7 +294,6 @@ struct wm97xx {
 struct wm97xx_batt_pdata {
 	int	batt_aux;
 	int	temp_aux;
-	int	charge_gpio;
 	int	min_voltage;
 	int	max_voltage;
 	int	batt_div;