External devices

[AYAN KUMAR HALDER]

On Mon, Sep 8, 2014 at 9:19 AM, Ran Shalit <ranshalit at gmail.com> wrote:
>>> The control on led brightness value is done as part of dedicated
>>> character device which was written for the purpose of brightness
>>> control (which uses i2c bus)
>>> I wander if this is possible using the linux PM capabilities, and how
>>> this should be done.
>> In either case it should be possible as per my understanding. You need
>> to implement
>> it in the appropriate PM handlers.
>> case1 ----> write the appropriate code in driver->pm->suspend
>> case2 ----> write the appropriate code in driver->pm->runtime_idle
>>
> Where should be the command to change brightness to minimum through
> i2c ? In runtime_suspend ?
>
If you want to reduce brightness to minimum when the character device goes in
a runtime-suspend mode, then Yes.
(Please include kernelnewbies, as others will also be able to respond
to your query
and rectify if I am mistaken)