linux-kernel - Re: [PATCH 2/5] Documentation: leds: Add description of brightness setting API

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Date:	Tue, 22 Sep 2015 13:03:35 +0200
From:	Jacek Anaszewski <j.anaszewski@...sung.com>
To:	Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:	linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
	andrew@...n.ch
Subject: Re: [PATCH 2/5] Documentation: leds: Add description of brightness
 setting API

Hi Sakari,

On 09/22/2015 12:26 PM, Sakari Ailus wrote:
> Hi Jacek,
>
> Jacek Anaszewski wrote:
>> This patch adds description of the LED subsystem API for
>> setting an LED brightness.
>>
>> Signed-off-by: Jacek Anaszewski <j.anaszewski@...sung.com>
>> ---
>>   Documentation/leds/leds-class.txt |   21 +++++++++++++++++++++
>>   1 file changed, 21 insertions(+)
>>
>> diff --git a/Documentation/leds/leds-class.txt b/Documentation/leds/leds-class.txt
>> index 62261c0..2cc38fa 100644
>> --- a/Documentation/leds/leds-class.txt
>> +++ b/Documentation/leds/leds-class.txt
>> @@ -52,6 +52,27 @@ above leaves scope for further attributes should they be needed. If sections
>>   of the name don't apply, just leave that section blank.
>>
>>
>> +Brightness setting API
>> +======================
>> +
>> +LED subsystem core exposes following API for setting brightness:
>> +
>> +    - led_set_brightness : if necessary, cancels the software blink timer that
>> +		implements blinking when the hardware doesn't; it is guaranteed
>> +		not to sleep, which implies the possibility of delegating the
>> +		job to a work queue task (uses led_set_brightness_nosleep
>> +		underneath - see below),
>> +    - led_set_brightness_sync : for use cases when immediate effect is desired;
>> +		it can block the caller for the time required for accessing
>> +		device registers and can sleep,
>> +    - led_set_brightness_nosleep : sets an LEDs brightness using either
>> +		brightness_set op, which is guaranteed not to sleep, or, if only
>> +		brightness_set_blocking op is available, delegates it to a work
>> +		queue task; this API is inteded for use by LED core and
>> +		led-triggers, as they can be called from atomic context, and thus
>> +		cannot sleep.
>
> led_set_brightness_nosleep() isn't part of the API intended to be used
> outside the LED framework --- I wouldn't document it here, only the part
> relevant for users outside the LED class and triggers frameworks.

OK, I'll move this description to drivers/leds/leds.h, next to the
function declaration.

>> +
>> +
>>   Hardware accelerated blink of LEDs
>>   ==================================
>>
>>
>
>


-- 
Best Regards,
Jacek Anaszewski
--
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