linux-kernel - uses of irq_to_gpio() in drivers/staging/iio

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Message-ID: <4E382924.2050201@googlemail.com>
Date:	Tue, 02 Aug 2011 17:43:16 +0100
From:	Ben Dooks <bjdooks@...glemail.com>
To:	linux-iio@...r.kernel.org, jic23@....ac.uk,
	LKML <linux-kernel@...r.kernel.org>
Subject: uses of irq_to_gpio() in drivers/staging/iio

Whilst looking in drivers/staging/iio/accel/lis3l02dq_core.c, I
came across the following lines of code

    708          if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) {
    709                  ret = request_threaded_irq(st->us->irq,
    710                                             &lis3l02dq_th,
    711 
&lis3l02dq_event_handler,
    712                                             IRQF_TRIGGER_RISING,
    713                                             "lis3l02dq",
    714                                             indio_dev);

Which gives rise to the following questions:

1) IRQ0 and GPIO0 are often valid numbers for GPIOs.

2) Not all interrupts are necessarily GPIO interrupts. What happens
    if the device is attached to a hardware interrupt line which is
    not a GPIO?

-- 
Ben Dooks <bjdooks@...glemail.com> http://www.fluff.org/ben/
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