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Input: charlieplex_keypad - check gpiod_direction_output() return value

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charlieplex_keypad_scan_line() currently ignores the return value of
gpiod_direction_output() when setting the active output line for scanning.

If setting the GPIO direction fails (e.g. on I2C/SPI GPIO expanders or
hardware errors), the function continues to sleep and read input values
from an improperly configured GPIO line.

Fix this by capturing the return value of gpiod_direction_output() and
returning the error code immediately if it fails.

Fixes: 2ca45e57ea ("Input: charlieplex_keypad - add GPIO charlieplex keypad")
Signed-off-by: Surendra Singh Chouhan <kr494167@gmail.com>
Link: https://patch.msgid.link/20260723022943.9337-1-kr494167@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Surendra Singh Chouhan 2026-07-23 07:59:43 +05:30 committed by Dmitry Torokhov
parent 0aa7c205e9
commit e640910640
1 changed files with 3 additions and 1 deletions
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4
drivers/input/keyboard/charlieplex_keypad.c
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@ -77,7 +77,9 @@ static int charlieplex_keypad_scan_line(struct charlieplex_keypad *keypad,
int err;
/* Activate only one line as output at a time. */
gpiod_direction_output(line_gpios->desc[oline], 1);
err = gpiod_direction_output(line_gpios->desc[oline], 1);
if (err)
return err;
if (keypad->settling_time_us)
fsleep(keypad->settling_time_us);