charlieplex_keypad
struct charlieplex_keypad *keypad = input_get_drvdata(input);
struct charlieplex_keypad *keypad)
struct charlieplex_keypad *keypad;
struct charlieplex_keypad *keypad = input_get_drvdata(input);
struct charlieplex_keypad *keypad = input_get_drvdata(input);
static int charlieplex_keypad_scan_line(struct charlieplex_keypad *keypad,