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authorMichael Roth <mroth@nessie.de>2009-06-10 23:30:55 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2009-06-11 02:07:25 -0700
commitc57c0a2a0d019aa8108f1155f99098ea7e7e1ab3 (patch)
tree8d0eba178a8f79616908af014124f6dc6447535d /drivers/input/touchscreen
parent7e3f73754e489e8c7742eaba15b608757b5bbb28 (diff)
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>
Diffstat (limited to 'drivers/input/touchscreen')
-rw-r--r--drivers/input/touchscreen/ads7846.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index 90f792c17ab..ba9d38c3f41 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -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);