linux-kernel - [PATCH 1/7] backlight: atmel-pwm-bl: use devm_gpio

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Date:	Wed, 13 Jun 2012 20:18:51 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Andrew Morton' <akpm@...ux-foundation.org>,
	'LKML' <linux-kernel@...r.kernel.org>
Cc:	'Richard Purdie' <rpurdie@...ys.net>,
	'Hans-Christian Egtvedt' <egtvedt@...fundet.no>,
	'Jingoo Han' <jg1.han@...sung.com>,
	'Axel Lin' <axel.lin@...il.com>
Subject: [PATCH 1/7] backlight: atmel-pwm-bl: use devm_gpio_request()

The devm_ functions allocate memory that is released when a driver
detaches. This patch uses devm_gpio_request of these functions.

Cc: Hans-Christian Egtvedt <egtvedt@...fundet.no>
Cc: Richard Purdie <rpurdie@...ys.net>
Signed-off-by: Jingoo Han <jg1.han@...sung.com>
---
 drivers/video/backlight/atmel-pwm-bl.c |   14 +++++---------
 1 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/video/backlight/atmel-pwm-bl.c b/drivers/video/backlight/atmel-pwm-bl.c
index cd64073..df1cbb7 100644
--- a/drivers/video/backlight/atmel-pwm-bl.c
+++ b/drivers/video/backlight/atmel-pwm-bl.c
@@ -155,7 +155,8 @@ static int atmel_pwm_bl_probe(struct platform_device *pdev)
 		goto err_free_mem;
 
 	if (pwmbl->gpio_on != -1) {
-		retval = gpio_request(pwmbl->gpio_on, "gpio_atmel_pwm_bl");
+		retval = devm_gpio_request(&pdev->dev, pwmbl->gpio_on,
+					"gpio_atmel_pwm_bl");
 		if (retval) {
 			pwmbl->gpio_on = -1;
 			goto err_free_pwm;
@@ -165,7 +166,7 @@ static int atmel_pwm_bl_probe(struct platform_device *pdev)
 		retval = gpio_direction_output(pwmbl->gpio_on,
 				0 ^ pdata->on_active_low);
 		if (retval)
-			goto err_free_gpio;
+			goto err_free_pwm;
 	}
 
 	memset(&props, 0, sizeof(struct backlight_properties));
@@ -175,7 +176,7 @@ static int atmel_pwm_bl_probe(struct platform_device *pdev)
 					  &atmel_pwm_bl_ops, &props);
 	if (IS_ERR(bldev)) {
 		retval = PTR_ERR(bldev);
-		goto err_free_gpio;
+		goto err_free_pwm;
 	}
 
 	pwmbl->bldev = bldev;
@@ -197,9 +198,6 @@ static int atmel_pwm_bl_probe(struct platform_device *pdev)
 err_free_bl_dev:
 	platform_set_drvdata(pdev, NULL);
 	backlight_device_unregister(bldev);
-err_free_gpio:
-	if (pwmbl->gpio_on != -1)
-		gpio_free(pwmbl->gpio_on);
 err_free_pwm:
 	pwm_channel_free(&pwmbl->pwmc);
 err_free_mem:
@@ -210,10 +208,8 @@ static int __exit atmel_pwm_bl_remove(struct platform_device *pdev)
 {
 	struct atmel_pwm_bl *pwmbl = platform_get_drvdata(pdev);
 
-	if (pwmbl->gpio_on != -1) {
+	if (pwmbl->gpio_on != -1)
 		gpio_set_value(pwmbl->gpio_on, 0);
-		gpio_free(pwmbl->gpio_on);
-	}
 	pwm_channel_disable(&pwmbl->pwmc);
 	pwm_channel_free(&pwmbl->pwmc);
 	backlight_device_unregister(pwmbl->bldev);
-- 
1.7.1


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