[PATCH v4] power: bq24735-charger: Request status GPIO with initial input setup

* [PATCH v4] power: bq24735-charger: Request status GPIO with initial input setup
@ 2016-09-02 22:09 ` Paul Kocialkowski
  0 siblings, 0 replies; 5+ messages in thread
From: Paul Kocialkowski @ 2016-09-02 22:09 UTC (permalink / raw)
  To: linux-kernel-u79uwXL29TY76Z2rM5mHXA
  Cc: linux-pm-u79uwXL29TY76Z2rM5mHXA,
	linux-tegra-u79uwXL29TY76Z2rM5mHXA, Dmitry Eremin-Solenikov,
	David Woodhouse, Sebastian Reichel, Paul Kocialkowski

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 gpio consumer.

Signed-off-by: Paul Kocialkowski <contact-W9ppeneeCTY@public.gmane.org>
---
 drivers/power/supply/bq24735-charger.c | 44 +++++++++++++---------------------
 include/linux/power/bq24735-charger.h  |  4 ----
 2 files changed, 16 insertions(+), 32 deletions(-)

diff --git a/drivers/power/supply/bq24735-charger.c b/drivers/power/supply/bq24735-charger.c
index dc460bb..44e3659 100644
--- a/drivers/power/supply/bq24735-charger.c
+++ b/drivers/power/supply/bq24735-charger.c
@@ -25,7 +25,7 @@
 #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>
 
@@ -49,6 +49,7 @@ struct bq24735 {
 	struct i2c_client		*client;
 	struct bq24735_platform		*pdata;
 	struct mutex			lock;
+	struct gpio_desc		*status_gpio;
 	bool				charging;
 };
 
@@ -177,12 +178,8 @@ static int bq24735_config_charger(struct bq24735 *charger)
 
 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;
 
@@ -308,7 +305,6 @@ static struct bq24735_platform *bq24735_parse_dt_data(struct i2c_client *client)
 	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) {
@@ -317,12 +313,6 @@ static struct bq24735_platform *bq24735_parse_dt_data(struct i2c_client *client)
 		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)
 		pdata->charge_current = val;
@@ -357,8 +347,11 @@ static int bq24735_charger_probe(struct i2c_client *client,
 	charger->charging = true;
 	charger->pdata = client->dev.platform_data;
 
-	if (IS_ENABLED(CONFIG_OF) && !charger->pdata && client->dev.of_node)
+	if (IS_ENABLED(CONFIG_OF) && !charger->pdata && client->dev.of_node) {
 		charger->pdata = bq24735_parse_dt_data(client);
+		if (IS_ERR(charger->pdata))
+			return PTR_ERR(charger->pdata);
+	}
 
 	if (!charger->pdata) {
 		dev_err(&client->dev, "no platform data provided\n");
@@ -396,21 +389,16 @@ static int bq24735_charger_probe(struct i2c_client *client,
 
 	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",
diff --git a/include/linux/power/bq24735-charger.h b/include/linux/power/bq24735-charger.h
index 6b750c1a..b04be59 100644
--- a/include/linux/power/bq24735-charger.h
+++ b/include/linux/power/bq24735-charger.h
@@ -28,10 +28,6 @@ struct bq24735_platform {
 
 	const char *name;
 
-	int status_gpio;
-	int status_gpio_active_low;
-	bool status_gpio_valid;
-
 	bool ext_control;
 
 	char **supplied_to;
-- 
2.9.3

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