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Input: synaptics-rmi4 - limit the range of what GPIOs are buttons 

By convention the first 6 bits of F30 Ctrl 2 and 3 are used to signify
GPIOs which are connected to buttons. Additional GPIOs may be used as
input GPIOs to signal the touch controller of some event
(ie disable touchpad). These additional GPIOs may meet the criteria of
a button in rmi_f30_is_valid_button() but should not be considered
buttons. This patch limits the GPIOs which are mapped to buttons to just
the first 6.

Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
Reported-by: Daniel Martin <consume.noise@gmail.com>
Tested-by: Daniel Martin <consume.noise@gmail.com>
Acked-By: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Andrew Duggan 2017-10-25 09:30:16 -07:00 committed by Dmitry Torokhov
parent a50829479f
commit 3e64fcbdbd
1 changed files with 3 additions and 2 deletions
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5
drivers/input/rmi4/rmi_f30.c
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@ -232,9 +232,10 @@ static int rmi_f30_map_gpios(struct rmi_function *fn,
unsigned int trackstick_button = BTN_LEFT;
bool button_mapped = false;
int i;
int button_count = min_t(u8, f30->gpioled_count, TRACKSTICK_RANGE_END);
f30->gpioled_key_map = devm_kcalloc(&fn->dev,
f30->gpioled_count,
button_count,
sizeof(f30->gpioled_key_map[0]),
GFP_KERNEL);
if (!f30->gpioled_key_map) {
@ -242,7 +243,7 @@ static int rmi_f30_map_gpios(struct rmi_function *fn,
return -ENOMEM;
}
for (i = 0; i < f30->gpioled_count; i++) {
for (i = 0; i < button_count; i++) {
if (!rmi_f30_is_valid_button(i, f30->ctrl))
continue;