linux-kernel - Re: [RFC v1 PATCH 4/6] input: pmic8058

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Message-ID: <4CDD013C.6050709@codeaurora.org>
Date:	Fri, 12 Nov 2010 14:26:28 +0530
From:	Trilok Soni <tsoni@...eaurora.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	rtc-linux@...glegroups.com, linux-arm-msm@...r.kernel.org,
	wruan@...eaurora.org
Subject: Re: [RFC v1 PATCH 4/6] input: pmic8058_pwrkey: Add support for power
 key

Hi Dmitry,

On 11/12/2010 6:27 AM, Dmitry Torokhov wrote:
> On Thu, Nov 11, 2010 at 05:30:21PM +0530, Trilok Soni wrote:
>> Hi Dmitry,
>>
>> On 11/11/2010 12:51 PM, Dmitry Torokhov wrote:
>>> Hi Trilkok,
>>>
>>> On Wed, Nov 10, 2010 at 06:17:59PM +0530, Trilok Soni wrote:
>>>> Add support for PMIC8058 power key driven over dedicated KYPD_PWR_N
>>>> pin. It allows the user to specify the amount of time by which the
>>>> power key reporting can be delayed.
>>>>
>>>
>>> Why do we need to delay KEY_POWER reporting? Do we need to use high
>>> resolution timers or regular timers would do as well? KEY_END
>>> appears to be abused (you don't want to move your cursor to the end
>>> of line, do you?). Also I wonder if header file should reside in
>>> linux/mfd with the rest of pmic8058 components.
>>
>> Most of the time Mobile devices come with single physical key for
>> POWER, which if pressed for less than 500ms (configurable) then it
>> will only report KEY_END (which say locks the screen on mobile) and if
>> it pressed more than 500ms then it will also report KEY_POWER event
>> too, which will say display menu on your mobile for asking you to
>> suspend/switch off/etc, operations.
>>
> 
> I see,. If you would have used KEY_SCREENLOCK iinstead of KEY_END I
> would likely not ask this question ;)
> 

KEY_SCRENNLOCK looks good, let me analyze the impact on userspace framework
which I have. I will come back on this in a day.

>> For the timers I can move from hrtimers to regular timers.
>>
>> For the header file, I can move them to include/linux/mfd too. No
>> problem on that.
>>
> 
> I am not even sure we need to keep them in separate header files, but it
> is up to you.

Do you suggest that all the MFD sub-devices's platform data structures should come from single
header file?

---Trilok Soni

-- 
Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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