When changing the scan rate as part of runtime-resume process we may lose
some of the events, because:

1) for gen3 trackpads, the driver must msleep() some time to ensure that
the device is ready to accept next command;

2) for gen5 and later trackpads, the queue dumping function will simply
ignore the events when waiting for the set power mode command response.

The solution is to keep polling and report those valid events when the set
power mode command is in progress.

Signed-off-by: Dudley Du <dudl@cypress.com>
Tested-by: Jeremiah Mahler <jmmahler@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Avoid the driver generate warning message when the cyapa driver working
with the old Gen5 trackpad device which does not support the proximity
function.  Those old Gen5 trackpad device all have the platform version
less than 2.

Signed-off-by: Dudley Du <dudl@cypress.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Fix the the runtime suspend power management not working issue when system
starts up and before user touches the trackpad device.
TEST=test on Chromebook.

Signed-off-by: Dudley Du <dudl@cypress.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Gen5 and Gen6 trackpad devices are able to detect and report object
proximity data/events, add this function support in the cyapa driver
through the ABS_DISTANCE event.

Signed-off-by: Dudley Du <dudl@cypress.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Based on the cyapa core, add support for basic functionality of the gen6
trackpad devices. The driver can automatically determine what protocol
(gen3, gen5, or gen6) should be used with the attached trackpad device.

Signed-off-by: Dudley Du <dudl@cypress.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Change 'gen5' to 'pip' for all macros, variables and functions that are
shared between gen5 and gen6 modules to make naming more clear and
readable.

Also fix a few spelling errors.

Signed-off-by: Dudley Du <dudl@cypress.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Signed-off-by: Shailendra Verma <shailendra.capricorn@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/mouse/cyapa_gen5.c: In function ‘cyapa_gen5_read_idac_data’:
drivers/input/mouse/cyapa_gen5.c:1876: warning: ‘max_element_cnt’ may be used uninitialized in this function
drivers/input/mouse/cyapa_gen5.c:1873: warning: ‘offset’ may be used uninitialized in this function

If *data_size is non-zero, and idac_data_type contains an unknown type,
max_element_cnt and offset will be uninitialized, and the loop will
process non-existing data.

However, this cannot happen (for now), as there's a test for unknown
types at the top of cyapa_gen5_read_idac_data().

As no "if ... else if ..." is used in other places, remove the
superfluous "if" to silence the compiler warning.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Dudley Du <dudl@cypress.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Use asm/unaligned.h instead of linux/unaligned/access_ok.h header file to
fix compiling issues such as following while doing cross platform
compiling:

"include/linux/unaligned/access_ok.h:7:19: error: redefinition of
 'get_unaligned_le16'
...
include/linux/unaligned/le_struct.h:6:19: note: previous definition of
 'get_unaligned_le16' was here".

Reported-by: kbuild test robot <kbuild-all@01.org>
Signed-off-by: Dudley Du <dudl@cypress.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Fixes the warning regarding variable being dereferenced before check
'gen5_pip->resp_len'.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Dudley Du <dudl@cypress.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>