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Input: ads7846 - pin change interrupt support

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Some SoCs support only pin change interrupts on GPIO pins used as irq
lines.

The ads7846 core is not affected from the additional irqs on the rising
edge because the code accounts touch bounce anyway by kicking in a timer
and disabling the irq after the first request and reenabling the irq after
a timeout when there is no longer pen down detected.

Signed-off-by: Michael Roth <mroth@nessie.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Michael Roth 2009-06-10 23:30:55 -07:00 committed by Dmitry Torokhov
parent 7e3f73754e
commit c57c0a2a0d
1 changed files with 9 additions and 3 deletions
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12
drivers/input/touchscreen/ads7846.c
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@ -1150,9 +1150,15 @@ static int __devinit ads7846_probe(struct spi_device *spi)
if (request_irq(spi->irq, ads7846_irq, IRQF_TRIGGER_FALLING,
spi->dev.driver->name, ts)) {
dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
err = -EBUSY;
goto err_free_gpio;
dev_info(&spi->dev,
"trying pin change workaround on irq %d\n", spi->irq);
err = request_irq(spi->irq, ads7846_irq,
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
spi->dev.driver->name, ts);
if (err) {
dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
goto err_free_gpio;
}
}
err = ads784x_hwmon_register(spi, ts);