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Input: ad7877 - increase pen up imeout 

The time interval between consecutive interrupts depends on a number of
tunables: first_conversion_delay, acquisition_time, averaging and foremost
the pen_down_acc_interval.

Since the mod_timer() action for the PEN UP event happens in the
spi_async() callback function, latencies incurred by the spi bus drivers
also need to be taken into account.

So all in all, give the PEN UP event a bit more wiggle room and increase
timeout to 100ms.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Michael Hennerich 2010-03-09 20:38:47 -08:00 committed by Dmitry Torokhov
parent 06a09124b5
commit 4eb6f91b95
1 changed files with 1 additions and 1 deletions
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2
drivers/input/touchscreen/ad7877.c
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@ -46,7 +46,7 @@
#include <linux/spi/ad7877.h>
#include <asm/irq.h>
#define TS_PEN_UP_TIMEOUT msecs_to_jiffies(50)
#define TS_PEN_UP_TIMEOUT msecs_to_jiffies(100)
#define MAX_SPI_FREQ_HZ 20000000
#define MAX_12BIT ((1<<12)-1)