power: supply: bq24735-charger: Request status GPIO with initial input setup

This requests the status GPIO with initial input setup. It is required
to read the GPIO status at probe time and thus correctly avoid sending
I2C messages when AC is not plugged.

When requesting the GPIO without initial input setup, it always reads 0
which causes probe to fail as it assumes the charger is connected, sends
I2C messages and fails.

While at it, this switches the driver over to gpiod API.

Signed-off-by: Paul Kocialkowski <[e-mail]>
Signed-off-by: Sebastian Reichel <[e-mail]>

drivers/power/supply/bq24735-charger.c

···
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/power_supply.h>
 #include <linux/slab.h>
 
···
 	struct i2c_client		*client;
 	struct bq24735_platform		*pdata;
 	struct mutex			lock;
+	struct gpio_desc		*status_gpio;
 	bool				charging;
 };
 
···
 
 static bool bq24735_charger_is_present(struct bq24735 *charger)
 {
-	struct bq24735_platform *pdata = charger->pdata;
-	int ret;
-
-	if (pdata->status_gpio_valid) {
-		ret = gpio_get_value_cansleep(pdata->status_gpio);
-		return ret ^= pdata->status_gpio_active_low == 0;
+	if (charger->status_gpio) {
+		return !gpiod_get_value_cansleep(charger->status_gpio);
 	} else {
 		int ac = 0;
 
···
 	struct device_node *np = client->dev.of_node;
 	u32 val;
 	int ret;
-	enum of_gpio_flags flags;
 
 	pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata) {
···
 			"Memory alloc for bq24735 pdata failed\n");
 		return NULL;
 	}
-
-	pdata->status_gpio = of_get_named_gpio_flags(np, "ti,ac-detect-gpios",
-						     0, &flags);
-
-	if (flags & OF_GPIO_ACTIVE_LOW)
-		pdata->status_gpio_active_low = 1;
 
 	ret = of_property_read_u32(np, "ti,charge-current", &val);
 	if (!ret)
···
 
 	i2c_set_clientdata(client, charger);
 
-	if (gpio_is_valid(charger->pdata->status_gpio)) {
-		ret = devm_gpio_request(&client->dev,
-					charger->pdata->status_gpio,
-					name);
-		if (ret) {
-			dev_err(&client->dev,
-				"Failed GPIO request for GPIO %d: %d\n",
-				charger->pdata->status_gpio, ret);
-		}
-
-		charger->pdata->status_gpio_valid = !ret;
+	charger->status_gpio = devm_gpiod_get_optional(&client->dev,
+						       "ti,ac-detect",
+						       GPIOD_IN);
+	if (IS_ERR(charger->status_gpio)) {
+		ret = PTR_ERR(charger->status_gpio);
+		dev_err(&client->dev, "Getting gpio failed: %d\n", ret);
+		return ret;
 	}
 
-	if (!charger->pdata->status_gpio_valid
-	    || bq24735_charger_is_present(charger)) {
+	if (!charger->status_gpio || bq24735_charger_is_present(charger)) {
 		ret = bq24735_read_word(client, BQ24735_MANUFACTURER_ID);
 		if (ret < 0) {
 			dev_err(&client->dev, "Failed to read manufacturer id : %d\n",

include/linux/power/bq24735-charger.h

···
 
 	const char *name;
 
-	int status_gpio;
-	int status_gpio_active_low;
-	bool status_gpio_valid;
-
 	bool ext_control;
 
 	char **supplied_to;