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

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Date:	Thu, 16 Dec 2010 15:07:16 +0200
From:	Onkalo Samu <samu.p.onkalo@...ia.com>
To:	ext Arun Murthy <arun.murthy@...ricsson.com>
Cc:	akpm@...ux-foundation.org, rpurdie@...ys.net,
	linus.walleij@...ricsson.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] leds-lp5521: modify the way of setting led device name

On Wed, 2010-12-15 at 17:25 +0530, ext Arun Murthy wrote:
> 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>

Looks ok.

I'll make similar patch for lp5523 at some point.

Acked-by: Samu Onkalo <samu.p.onkalo@...ia.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 */


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