Input: edt-ft5x06 - work around first register access error

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[ Upstream commit e112324cc0 ]

The EP0700MLP1 returns bogus data on the first register read access
(reading the threshold parameter from register 0x00):

    edt_ft5x06 2-0038: crc error: 0xfc expected, got 0x40

It ignores writes until then. This patch adds a dummy read after which
the number of sensors and parameter read/writes work correctly.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Tested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Philipp Zabel 2020-01-09 17:03:21 -08:00 • committed by Greg Kroah-Hartman

parent 13285b66d0

commit a762cfd791

1 changed files with 7 additions and 0 deletions

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drivers/input/touchscreen/edt-ft5x06.c

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