linux-kernel - Re: [PATCH/RFC v6 01/36] leds: Add brightness_set

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Message-ID: <20150820152157.GD27457@lunn.ch>
Date:	Thu, 20 Aug 2015 17:21:57 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Jacek Anaszewski <j.anaszewski@...sung.com>
Cc:	linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Pavel Machek <pavel@....cz>,
	Stas Sergeev <stsp@...rs.sourceforge.net>
Subject: Re: [PATCH/RFC v6 01/36] leds: Add brightness_set_blocking op

On Thu, Aug 20, 2015 at 04:43:31PM +0200, Jacek Anaszewski wrote:
> This patch adds a new brightness_set_blocking op to the LED subsystem.
> The op is intended for drivers that set brightness in a blocking way,
> i.e. they either can sleep or use delays while setting brightness.

Thanks for adding this. This is the correct way to go.

Acked-by: Andrew Lunn <andrew@...n.ch>

	  Andrew
 
> Signed-off-by: Jacek Anaszewski <j.anaszewski@...sung.com>
> Cc: Andrew Lunn <andrew@...n.ch>
> Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>
> Cc: Pavel Machek <pavel@....cz>
> Cc: Stas Sergeev <stsp@...rs.sourceforge.net>
> ---
>  drivers/leds/led-class.c |    3 +++
>  include/linux/leds.h     |    6 ++++++
>  2 files changed, 9 insertions(+)
> 
> diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
> index ca51d58..93a2414 100644
> --- a/drivers/leds/led-class.c
> +++ b/drivers/leds/led-class.c
> @@ -267,6 +267,9 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
>  		dev_warn(parent, "Led %s renamed to %s due to name collision",
>  				led_cdev->name, dev_name(led_cdev->dev));
>  
> +	WARN_ON(led_cdev->brightness_set &&
> +		led_cdev->brightness_set_blocking);
> +
>  #ifdef CONFIG_LEDS_TRIGGERS
>  	init_rwsem(&led_cdev->trigger_lock);
>  #endif
> diff --git a/include/linux/leds.h b/include/linux/leds.h
> index b122eea..85fad6b 100644
> --- a/include/linux/leds.h
> +++ b/include/linux/leds.h
> @@ -54,6 +54,12 @@ struct led_classdev {
>  	void		(*brightness_set)(struct led_classdev *led_cdev,
>  					  enum led_brightness brightness);
>  	/*
> +	 * Intended for drivers that either can sleep or use delays while
> +	 * setting brightness.
> +	 */
> +	int (*brightness_set_blocking)(struct led_classdev *led_cdev,
> +				       enum led_brightness brightness);
> +	/*
>  	 * Set LED brightness level immediately - it can block the caller for
>  	 * the time required for accessing a LED device register.
>  	 */
> -- 
> 1.7.9.5
> 
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