linux-kernel - Re: [PATCH v12 1/2] leds: core: Introduce LED pattern trigger

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Date:   Fri, 21 Sep 2018 22:59:40 +0200
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Baolin Wang <baolin.wang@...aro.org>, Pavel Machek <pavel@....cz>
Cc:     rteysseyre@...il.com, Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v12 1/2] leds: core: Introduce LED pattern trigger

Hi Baolin,

On 09/21/2018 05:31 AM, Baolin Wang wrote:
> Hi Jacek and Pavel,
> 
> On 11 September 2018 at 10:47, Baolin Wang <baolin.wang@...aro.org> wrote:
>> This patch adds one new led trigger that LED device can configure
>> the software or hardware pattern and trigger it.
>>
>> Consumers can write 'pattern' file to enable the software pattern
>> which alters the brightness for the specified duration with one
>> software timer.
>>
>> Moreover consumers can write 'hw_pattern' file to enable the hardware
>> pattern for some LED controllers which can autonomously control
>> brightness over time, according to some preprogrammed hardware
>> patterns.
>>
>> Signed-off-by: Raphael Teysseyre <rteysseyre@...il.com>
>> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
>> ---
>> Changes from v11:
>>  - Change -1 means repeat indefinitely.
>>
>> Changes from v10:
>>  - Change 'int' to 'u32' for delta_t field.
>>
>> Changes from v9:
>>  - None.
>>
>> Changes from v8:
>>  - None.
>>
>> Changes from v7:
>>  - Move the SC27XX hardware patterns description into its own ABI file.
>>
>> Changes from v6:
>>  - Improve commit message.
>>  - Optimize the description of the hw_pattern file.
>>  - Simplify some logics.
>>
>> Changes from v5:
>>  - Add one 'hw_pattern' file for hardware patterns.
>>
>> Changes from v4:
>>  - Change the repeat file to return the originally written number.
>>  - Improve comments.
>>  - Fix some build warnings.
>>
>> Changes from v3:
>>  - Reset pattern number to 0 if user provides incorrect pattern string.
>>  - Support one pattern.
>>
>> Changes from v2:
>>  - Remove hardware_pattern boolen.
>>  - Chnage the pattern string format.
>>
>> Changes from v1:
>>  - Use ATTRIBUTE_GROUPS() to define attributes.
>>  - Introduce hardware_pattern flag to determine if software pattern
>>  or hardware pattern.
>>  - Re-implement pattern_trig_store_pattern() function.
>>  - Remove pattern_get() interface.
>>  - Improve comments.
>>  - Other small optimization.
>> ---
> 
> Do you have any comments for the v12 patch set? Thanks.

We will probably have to remove hw_pattern from ledtrig-pattern
since we are unable to come up with generic interface for it.
Unless thread [0] will end up with some brilliant ideas. So far
we're waiting for Pavel's reply.

[0] https://lkml.org/lkml/2018/9/13/1216

-- 
Best regards,
Jacek Anaszewski