iio: mxs-lradc: make ADC reads not disable touchscreen interrupts

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commit 86bf7f3ef7 upstream.

Reading a channel through sysfs, or starting a buffered capture, will
currently turn off the touchscreen. This is because the read_raw() and
buffer preenable()/postdisable() callbacks disable interrupts for all
LRADC channels, including those the touchscreen uses.

So make the callbacks only disable interrupts for the channels they use.
This means channel 0 for read_raw() and channels 0-5 for the buffer (if
the touchscreen is enabled). Since the touchscreen uses different
channels (6 and 7), it no longer gets turned off.

Note that only i.MX28 is affected by this issue, i.MX23 should be fine.

Signed-off-by: Kristina Martšenko <kristina.martsenko@gmail.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Kristina Martšenko 2015-01-25 18:28:20 +02:00 • committed by Greg Kroah-Hartman

parent 852f7d2d09

commit 824ff2b93f

1 changed files with 15 additions and 5 deletions

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drivers/staging/iio/adc/mxs-lradc.c

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