linux-kernel - [PATCHv3 8/9] extcon: gpio: Use devm_extcon_dev_allocate for extcon

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Date:	Thu, 24 Apr 2014 21:34:56 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	myungjoo.ham@...sung.com, balbi@...com, gg@...mlogic.co.uk,
	kishon@...com, ckeepax@...nsource.wolfsonmicro.com,
	broonie@...nel.org, k.kozlowski@...sung.com,
	kyungmin.park@...sung.com, Chanwoo Choi <cw00.choi@...sung.com>
Subject: [PATCHv3 8/9] extcon: gpio: Use devm_extcon_dev_allocate for extcon_dev

This patch use devm_extcon_dev_allocate() to simplify the memory control
of extcon device.

Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
---
 drivers/extcon/extcon-gpio.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
index 43af34c..41e2157 100644
--- a/drivers/extcon/extcon-gpio.c
+++ b/drivers/extcon/extcon-gpio.c
@@ -32,7 +32,7 @@
 #include <linux/extcon/extcon-gpio.h>
 
 struct gpio_extcon_data {
-	struct extcon_dev edev;
+	struct extcon_dev *edev;
 	unsigned gpio;
 	bool gpio_active_low;
 	const char *state_on;
@@ -53,7 +53,7 @@ static void gpio_extcon_work(struct work_struct *work)
 	state = gpio_get_value(data->gpio);
 	if (data->gpio_active_low)
 		state = !state;
-	extcon_set_state(&data->edev, state);
+	extcon_set_state(data->edev, state);
 }
 
 static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
@@ -67,9 +67,10 @@ static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
 
 static ssize_t extcon_gpio_print_state(struct extcon_dev *edev, char *buf)
 {
-	struct gpio_extcon_data	*extcon_data =
-		container_of(edev, struct gpio_extcon_data, edev);
+	struct device *dev = edev->dev.parent;
+	struct gpio_extcon_data *extcon_data = dev_get_drvdata(dev);
 	const char *state;
+
 	if (extcon_get_state(edev))
 		state = extcon_data->state_on;
 	else
@@ -98,15 +99,21 @@ static int gpio_extcon_probe(struct platform_device *pdev)
 	if (!extcon_data)
 		return -ENOMEM;
 
-	extcon_data->edev.name = pdata->name;
-	extcon_data->edev.dev.parent = &pdev->dev;
+	extcon_data->edev = devm_extcon_dev_allocate(&pdev->dev, NULL);
+	if (!extcon_data->edev) {
+		dev_err(&pdev->dev, "failed to allocate extcon device\n");
+		return -ENOMEM;
+	}
+	extcon_data->edev->name = pdata->name;
+	extcon_data->edev->dev.parent = &pdev->dev;
+
 	extcon_data->gpio = pdata->gpio;
 	extcon_data->gpio_active_low = pdata->gpio_active_low;
 	extcon_data->state_on = pdata->state_on;
 	extcon_data->state_off = pdata->state_off;
 	extcon_data->check_on_resume = pdata->check_on_resume;
 	if (pdata->state_on && pdata->state_off)
-		extcon_data->edev.print_state = extcon_gpio_print_state;
+		extcon_data->edev->print_state = extcon_gpio_print_state;
 
 	ret = devm_gpio_request_one(&pdev->dev, extcon_data->gpio, GPIOF_DIR_IN,
 				    pdev->name);
@@ -121,7 +128,7 @@ static int gpio_extcon_probe(struct platform_device *pdev)
 				msecs_to_jiffies(pdata->debounce);
 	}
 
-	ret = devm_extcon_dev_register(&pdev->dev, &extcon_data->edev);
+	ret = devm_extcon_dev_register(&pdev->dev, extcon_data->edev);
 	if (ret < 0)
 		return ret;
 
-- 
1.8.0

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