diff options
| author |   Andrew Duggan <aduggan@synaptics.com> | 2017-10-25 09:30:16 -0700 |
|---|---|---|
| committer |   Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2017-10-27 15:15:59 -0700 |
| commit | 3e64fcbdbd10e46dede502d507dbcc104837cd59 (patch) | |
| tree | ece39dc5ac2621ed847b6257bc9be61e30588eee /drivers/input/rmi4 | |
| parent | Input: gtco - fix potential out-of-bound access (diff) | |
| download | linux-dev-3e64fcbdbd10e46dede502d507dbcc104837cd59.tar.xz linux-dev-3e64fcbdbd10e46dede502d507dbcc104837cd59.zip | |
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>
Diffstat (limited to 'drivers/input/rmi4')
| -rw-r--r-- | drivers/input/rmi4/rmi_f30.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/input/rmi4/rmi_f30.c b/drivers/input/rmi4/rmi_f30.c index 34dfee555b20..82e0f0d43d55 100644 --- a/drivers/input/rmi4/rmi_f30.c +++ b/drivers/input/rmi4/rmi_f30.c @@ -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; |