Re: [PATCH 2/2] leds: trigger: gpio: make ledtrig-gpio useable with GPIO drivers requiring threaded irqs

[Bryan Wu]

On Fri, Sep 12, 2014 at 12:09 AM, Lothar WaÃmann <LW@xxxxxxxxxxxxxxxxxxx> wrote:
> Hi,
>
> Bryan Wu wrote:
>> On Tue, Sep 9, 2014 at 12:40 AM, Lothar WaÃmann <LW@xxxxxxxxxxxxxxxxxxx> wrote:
>> > When trying to use the LED GPIO trigger with e.g. the PCA953x GPIO
>> > driver, request_irq() fails with -EINVAL, because the GPIO driver
>> > requires a nested interrupt handler.
>> >
>> > Use request_any_context_irq() to be able to use any GPIO driver as LED
>> > trigger.
>> >
>>
>> Hmmm, what about use request_thread_irq() and put the gpio_trig_work()
>> in as the thread_func.
>>
>> Felipe, can you take a look at this?
>>
>> Also in the first patch:
>> Actually in gpio_trig_irq(), it said:
>> /* just schedule_work since gpio_get_value can sleep */
>>         schedule_work(&gpio_data->work);
>>
>> Then that means we need to call gpio_get_value_can_sleep() in the
>> gpio_trig_work() instead of gpio_get_value(), right?
>>
> That's exactly what my first patch does!
>

Yeah, exactly. I'm just curious about the comment here.

-Bryan

>
> Lothar WaÃmann
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