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Message-ID: <AANLkTi=RgZcykxPnUcneGfZnETo9nK_72Qoa=8rKh2rD@mail.gmail.com>
Date: Tue, 31 Aug 2010 03:13:04 -0400
From: "Mark F. Brown" <mark.brown314@...il.com>
To: Eric Miao <eric.y.miao@...il.com>
Cc: Haojian Zhuang <haojian.zhuang@...il.com>,
Haojian Zhuang <haojian.zhuang@...vell.com>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-input <linux-input@...r.kernel.org>
Subject: Re: [PATCH 4/5] ARM: pxa168: added special case handler for keypad interrupts
On Tue, Aug 31, 2010 at 3:05 AM, Eric Miao <eric.y.miao@...il.com> wrote:
> On Tue, Aug 31, 2010 at 2:28 PM, Mark F. Brown <mark.brown314@...il.com> wrote:
>> On Tue, Aug 31, 2010 at 12:53 AM, Haojian Zhuang
>> <haojian.zhuang@...il.com> wrote:
>>> On Thu, Aug 26, 2010 at 5:18 PM, Mark F. Brown <mark.brown314@...il.com> wrote:
>>>> Signed-off-by: Mark F. Brown <mark.brown314@...il.com>
>>>> ---
>>>> arch/arm/mach-mmp/irq-pxa168.c | 23 ++++++++++++++++++++++-
>>>> 1 files changed, 22 insertions(+), 1 deletions(-)
>>>>
>>>> diff --git a/arch/arm/mach-mmp/irq-pxa168.c b/arch/arm/mach-mmp/irq-pxa168.c
>>>> index 52ff2f0..bfb0984 100644
>>>> --- a/arch/arm/mach-mmp/irq-pxa168.c
>>>> +++ b/arch/arm/mach-mmp/irq-pxa168.c
>>>> @@ -17,6 +17,8 @@
>>>> #include <linux/io.h>
>>>>
>>>> #include <mach/regs-icu.h>
>>>> +#include <mach/regs-apmu.h>
>>>> +#include <mach/cputype.h>
>>>>
>>>> #include "common.h"
>>>>
>>>> @@ -42,6 +44,19 @@ static struct irq_chip icu_irq_chip = {
>>>> .unmask = icu_unmask_irq,
>>>> };
>>>>
>>>> +void handle_pxa168_keypad_irq(unsigned int irq, struct irq_desc *desc)
>>>> +{
>>>> + uint32_t val;
>>>> + uint32_t mask = APMU_PXA168_KP_WAKE_CLR;
>>>> +
>>>> + /* clear keypad wake event */
>>>> + val = __raw_readl(APMU_WAKE_CLR);
>>>> + __raw_writel(val | mask, APMU_WAKE_CLR);
>>>> +
>>>> + /* handle irq */
>>>> + handle_level_irq(irq, desc);
>>>> +}
>>>> +
>>>
>>> Why should you clear wakeup event status in IRQ handler? If system is
>>> resumed by keypad event, you should clear this wakeup source in resume
>>> code. I think that IRQ code should not be binded with wakeup event at
>>> here.
>>>
>>>> void __init icu_init_irq(void)
>>>> {
>>>> int irq;
>>>> @@ -49,7 +64,13 @@ void __init icu_init_irq(void)
>>>> for (irq = 0; irq < 64; irq++) {
>>>> icu_mask_irq(irq);
>>>> set_irq_chip(irq, &icu_irq_chip);
>>>> - set_irq_handler(irq, handle_level_irq);
>>>> +
>>>> + /* special handler for keypad */
>>>> + if (cpu_is_pxa168() && irq == IRQ_PXA168_KEYPAD)
>>>> + set_irq_handler(irq, handle_pxa168_keypad_irq);
>>>> + else
>>>> + set_irq_handler(irq, handle_level_irq);
>>>> +
>>>> set_irq_flags(irq, IRQF_VALID);
>>>> }
>>>> }
>>>> --
>>>> 1.7.0.4
>>>>
>>>> --
>>>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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>>>> Please read the FAQ at http://www.tux.org/lkml/
>>>>
>>>
>>
>> Haojian, this is an usual case, but without that clear wake event you
>> will not be able to clear the keypad interrupt. For my push to open
>> source I re-wrote the workaround code and added it as a special case
>> IRQ handler. In the Marvell pxa168 code base it is actually located in
>> the keypad interrupt handler as the function clear_wakeup(). I felt it
>> was better to isolate this code in the mmp common code base instead.
>
> I'd rather the irq handler not being changed and use platform_data instead.
> How about something below:
>
> diff --git a/arch/arm/mach-mmp/include/mach/pxa168.h
> b/arch/arm/mach-mmp/include/mach/pxa168.h
> index 27e1bc7..d2b7946 100644
> --- a/arch/arm/mach-mmp/include/mach/pxa168.h
> +++ b/arch/arm/mach-mmp/include/mach/pxa168.h
> @@ -5,6 +5,7 @@ struct sys_timer;
>
> extern struct sys_timer pxa168_timer;
> extern void __init pxa168_init_irq(void);
> +extern void pxa168_clear_keypad_wakeup(void);
>
> #include <linux/i2c.h>
> #include <mach/devices.h>
> @@ -97,4 +98,10 @@ static inline int pxa168_add_nand(struct
> pxa3xx_nand_platform_data *info)
> {
> return pxa_register_device(&pxa168_device_nand, info, sizeof(*info));
> }
> +
> +static inline int pxa168_add_keypad(struct pxa27x_keypad_platform_data *info)
> +{
> + info->clear_wakeup = pxa168_clear_keypad_wakeup;
> + return pxa_register_device(&pxa168_device_keypad, info, sizeof(*info));
> +}
> #endif /* __ASM_MACH_PXA168_H */
> diff --git a/arch/arm/mach-pxa/include/mach/pxa27x_keypad.h
> b/arch/arm/mach-pxa/include/mach/pxa27x_keypad.h
> index 7b4eadc..3a6bfe7 100644
> --- a/arch/arm/mach-pxa/include/mach/pxa27x_keypad.h
> +++ b/arch/arm/mach-pxa/include/mach/pxa27x_keypad.h
> @@ -52,6 +52,7 @@ struct pxa27x_keypad_platform_data {
>
> /* key debounce interval */
> unsigned int debounce_interval;
> + void (*clear_wakeup);
> };
>
> 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 f32404f..3fb94fe 100644
> --- a/drivers/input/keyboard/pxa27x_keypad.c
> +++ b/drivers/input/keyboard/pxa27x_keypad.c
> @@ -330,10 +330,20 @@ static void pxa27x_keypad_scan_direct(struct
> pxa27x_keypad *keypad)
> keypad->direct_key_state = new_state;
> }
>
> +static void clear_wakeup(struct pxa27x_keypad *keypad)
> +{
> + struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
> +
> + if (pdata->clear_wakeup)
> + (pdata->clear_wakeup)();
> +}
> +
> static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
> {
> struct pxa27x_keypad *keypad = dev_id;
> - unsigned long kpc = keypad_readl(KPC);
> + unsigned long kpc;
> +
> + kpc = keypad_readl(KPC);
>
> if (kpc & KPC_DI)
> pxa27x_keypad_scan_direct(keypad);
>
Ok if you are fine with that I will make that change and resubmit!
Regards,
-- Mark
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