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

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Date:	Fri, 12 Sep 2014 09:09:18 +0200
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Bryan Wu <cooloney@...il.com>
Cc:	Linux LED Subsystem <linux-leds@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Richard Purdie <rpurdie@...ys.net>
Subject: Re: [PATCH 2/2] leds: trigger: gpio: make ledtrig-gpio useable with
 GPIO drivers requiring threaded irqs

Hi,

Bryan Wu wrote:
> On Tue, Sep 9, 2014 at 12:40 AM, Lothar Waßmann <LW@...o-electronics.de> 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!


Lothar Waßmann
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