Commit c57c0a2a authored Jun 10, 2009 by Michael Roth Committed by Dmitry Torokhov Jun 11, 2009

Input: ads7846 - pin change interrupt support



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>

parent 7e3f7375

drivers/input/touchscreen/ads7846.c

+9 −3

Original line number	Diff line number	Diff line
		@@ -1150,10 +1150,16 @@ 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_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);
		err = -EBUSY;
		goto err_free_gpio;
		}
		}

		err = ads784x_hwmon_register(spi, ts);
		if (err)