linux-kernel - [PATCH] leds-lp5521: modify the way of setting led device name

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Date:	Wed, 15 Dec 2010 17:25:08 +0530
From:	Arun Murthy <arun.murthy@...ricsson.com>
To:	<samu.p.onkalo@...ia.com>, <akpm@...ux-foundation.org>,
	<rpurdie@...ys.net>
Cc:	<arun.murthy@...ricsson.com>, <linus.walleij@...ricsson.com>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH] leds-lp5521: modify the way of setting led device name

Currently the led device name is fetched from the device_type in
I2C_BOARD_INFO which comes from the platform data. This name is in turn
used to create an entry in sysfs.

If there exists two or more lp5521 on a particular platform, the
device_type in I2C_BOARD_INFO has to be the same, else lp5521 driver
probe wont be called and if used so, results in run time warning "cannot
create sysfs with same name" and hence a failure.

The name that is used to create sysfs entry is to be passed by the
struct led_platform_data. Hence adding an element of type const char *
and change in lp5521 driver to use this name in creating the led device
if present else use the name obtained by I2C_BOARD_INFO.

Signed-off-by: Arun Murthy <arun.murthy@...ricsson.com>
---
 drivers/leds/leds-lp5521.c  |    3 ++-
 include/linux/leds-lp5521.h |    1 +
 2 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
index 33facd0..745ad99 100644
--- a/drivers/leds/leds-lp5521.c
+++ b/drivers/leds/leds-lp5521.c
@@ -651,7 +651,8 @@ static int __init lp5521_init_led(struct lp5521_led *led,
 		return -EINVAL;
 	}
 
-	snprintf(name, sizeof(name), "%s:channel%d", client->name, chan);
+	snprintf(name, sizeof(name), "%s:channel%d",
+			pdata->label ?: client->name, chan);
 	led->cdev.brightness_set = lp5521_set_brightness;
 	led->cdev.name = name;
 	res = led_classdev_register(dev, &led->cdev);
diff --git a/include/linux/leds-lp5521.h b/include/linux/leds-lp5521.h
index 38368d7..fd548d2 100644
--- a/include/linux/leds-lp5521.h
+++ b/include/linux/leds-lp5521.h
@@ -42,6 +42,7 @@ struct lp5521_platform_data {
 	int	(*setup_resources)(void);
 	void	(*release_resources)(void);
 	void	(*enable)(bool state);
+	const char *label;
 };
 
 #endif /* __LINUX_LP5521_H */
-- 
1.7.2.dirty

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