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From: "Kim, HeungJun" <riverful.kim@samsung.com>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: "linux-input@vger.kernel.org" <linux-input@vger.kernel.org>
Subject: Re: [PATCH v2 2/2] input: keyboard: MCS5080: support shutdown.
Date: Mon, 13 Dec 2010 19:30:22 +0900	[thread overview]
Message-ID: <4D05F5BE.8000905@samsung.com> (raw)
In-Reply-To: <20101213090121.GG21401@core.coreip.homeip.net>

And the reason to insert powerof() function is that,
the MCS50XX series has some HW bugs like following:

If the MCS50XX is not yet powered down before the whole system is power-down,
when control pins like a powerup or interrupt is pulluped,
the residue current is flow into chips and the chip still consume the power.

It seems not be important general PC(if this small device is implemented with PC),
but it's very important in the mobile device.

sorry not to write such specific contents before.

Thanks.

Regards,
HeungJun Kim


2010-12-13 오후 6:01, Dmitry Torokhov 쓴 글:
> On Fri, Nov 19, 2010 at 03:23:09PM +0900, Kim, HeungJun wrote:
>> This patch supports shutdown functions for mcs5080 touchkey
>> driver.
>>
> 
> Rarely a device needs shutdown method; normally it is enough to simply
> cut power off. Why this device needs it?
> 
> Thanks.
> 

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      reply	other threads:[~2010-12-13 10:30 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-11-19  6:23 [PATCH v2 2/2] input: keyboard: MCS5080: support shutdown Kim, HeungJun
2010-12-13  9:01 ` Dmitry Torokhov
2010-12-13 10:30   ` Kim, HeungJun [this message]

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