linux-kernel - Re: [PATCH/RFC 1/8] leds: Add sysfs and kernel internal API for flash LEDs

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Date:	Fri, 28 Mar 2014 16:30:19 +0100
From:	Jacek Anaszewski <j.anaszewski@...sung.com>
To:	Sakari Ailus <sakari.ailus@....fi>
Cc:	linux-media@...r.kernel.org, linux-leds@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	s.nawrocki@...sung.com, a.hajda@...sung.com,
	kyungmin.park@...sung.com, Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>
Subject: Re: [PATCH/RFC 1/8] leds: Add sysfs and kernel internal API for flash
 LEDs

Hi Sakari,

Thanks for the review.

On 03/24/2014 12:18 AM, Sakari Ailus wrote:
> Hi Jacek,
>
> Thanks for the patchset. It's very nice in general. I have a few comments
> below.

[...]

>> diff --git a/include/linux/leds.h b/include/linux/leds.h
>> index 0287ab2..1bf0ab3 100644
>> --- a/include/linux/leds.h
>> +++ b/include/linux/leds.h
>> @@ -17,6 +17,14 @@
>>   #include <linux/rwsem.h>
>>   #include <linux/timer.h>
>>   #include <linux/workqueue.h>
>> +#include <linux/mutex.h>
>
> mutex.h should be earlier in the list of included files.
>
>> +#include <media/v4l2-device.h>
>> +
>> +#define LED_FAULT_OVER_VOLTAGE		(1 << 0)
>> +#define LED_FAULT_TIMEOUT		(1 << 1)
>> +#define LED_FAULT_OVER_TEMPERATURE	(1 << 2)
>> +#define LED_FAULT_SHORT_CIRCUIT		(1 << 3)
>> +#define LED_FAULT_OVER_CURRENT		(1 << 4)
>
> This patch went in to the media-tree some time ago. I wonder if the relevant
> bits should be added here now as well.
>
> commit 935aa6b2e8a911e81baecec0537dd7e478dc8c91
> Author: Daniel Jeong <gshark.jeong@...il.com>
> Date:   Mon Mar 3 06:52:08 2014 -0300
>
>      [media] v4l2-controls.h: Add addtional Flash fault bits
>
>      Three Flash fault are added. V4L2_FLASH_FAULT_UNDER_VOLTAGE for the case low
>      voltage below the min. limit. V4L2_FLASH_FAULT_INPUT_VOLTAGE for the case
>      falling input voltage and chip adjust flash current not occur under voltage
>      event. V4L2_FLASH_FAULT_LED_OVER_TEMPERATURE for the case the temperature
>      exceed the maximun limit
>
>      Signed-off-by: Daniel Jeong <gshark.jeong@...il.com>
>      Signed-off-by: Sakari Ailus <sakari.ailus@....fi>
>      Signed-off-by: Mauro Carvalho Chehab <m.chehab@...sung.com>

As it will not cause a build break and any runtime problems, even if
the patch is not merged, I added these bits to my implementation.

BTW I have doubts about V4L2_FLASH_FAULT_INDICATOR and 
V4L2_CID_FLASH_INDICATOR_INTENSITY control. I did not take them
into account in my implementation because it is not clear for
me how an indicator led is related to a torch led. There is
a control for setting indicator intensity but there is not
one for enabling it. Could you shed some light on this issue?

Regards,
Jacek Anaszewski

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