linux-kernel - Re: [PATCH v2 4/6 RESEND] ARM: pxa27x_keypad: added wakeup event handler for keypad interrupts

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Date:	Sun, 5 Sep 2010 18:46:56 +0800
From:	Eric Miao <eric.y.miao@...il.com>
To:	Igor Grinberg <grinberg@...pulab.co.il>
Cc:	"Mark F. Brown" <mark.brown314@...il.com>,
	Haojian Zhuang <haojian.zhuang@...vell.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH v2 4/6 RESEND] ARM: pxa27x_keypad: added wakeup event
 handler for keypad interrupts

On Sun, Sep 5, 2010 at 4:02 PM, Igor Grinberg <grinberg@...pulab.co.il> wrote:
>  On 09/04/10 01:28, Mark F. Brown wrote:
>> mach-mmp needs to clear wake event in order to clear the keypad interrupt
>>
>> Signed-off-by: Mark F. Brown <mark.brown314@...il.com>
>> ---
>>  arch/arm/plat-pxa/include/plat/pxa27x_keypad.h |    1 +
>>  drivers/input/keyboard/pxa27x_keypad.c         |   10 ++++++++++
>>  2 files changed, 11 insertions(+), 0 deletions(-)
>>
>> diff --git a/arch/arm/plat-pxa/include/plat/pxa27x_keypad.h b/arch/arm/plat-pxa/include/plat/pxa27x_keypad.h
>> index 7b4eadc..73dacda 100644
>> --- a/arch/arm/plat-pxa/include/plat/pxa27x_keypad.h
>> +++ b/arch/arm/plat-pxa/include/plat/pxa27x_keypad.h
>> @@ -52,6 +52,7 @@ struct pxa27x_keypad_platform_data {
>>
>>       /* key debounce interval */
>>       unsigned int    debounce_interval;
>> +     void            (*clear_wakeup_event)(void);
>
> I understand, this is a bit late... but still I want to ask a question:
> As I understand, the clear_wakeup_event() function is called in interrupt context,
> wouldn't it be wiser to add a comment on this, so platform (current/future) code
> will be aware and will make no heavy stuff in it (accidentally).
>

A comment will be good to have indeed, not just explaining the context
this function will be running, but also a bit about why this is introduced.

Mark,

If you come up with an updated patch, I'll help rebase my tree.

>>  };
>>
>>  extern void pxa_set_keypad_info(struct pxa27x_keypad_platform_data *info);
>> diff --git a/drivers/input/keyboard/pxa27x_keypad.c b/drivers/input/keyboard/pxa27x_keypad.c
>> index 0610d10..b36d2be 100644
>> --- a/drivers/input/keyboard/pxa27x_keypad.c
>> +++ b/drivers/input/keyboard/pxa27x_keypad.c
>> @@ -330,11 +330,21 @@ static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
>>       keypad->direct_key_state = new_state;
>>  }
>>
>> +static void clear_wakeup_event(struct pxa27x_keypad *keypad)
>> +{
>> +     struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
>> +
>> +     if (pdata->clear_wakeup_event)
>> +             (pdata->clear_wakeup_event)();
>> +}
>> +
>>  static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
>>  {
>>       struct pxa27x_keypad *keypad = dev_id;
>>       unsigned long kpc = keypad_readl(KPC);
>>
>> +     clear_wakeup_event(keypad);
>> +
>>       if (kpc & KPC_DI)
>>               pxa27x_keypad_scan_direct(keypad);
>>
>
> --
> Regards,
> Igor.
>
>
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