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drivers/input: report special keys from the keyboard matrix

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The matrix driver reported every key with KEYBOARD_PRESS and
KEYBOARD_RELEASE, so a board whose matrix has arrows or function keys
had no way to say so:  the keycode ranges overlap the character range,
and the event type is what tells them apart.

A keymap entry is a uint32_t, so wrap the entry in KMATRIX_SPECIAL() to
declare that it holds a value from enum kbd_keycode_e.  Existing keymaps
hold characters and are unaffected.

While here, drop the cast that truncated the keycode to sixteen bits,
and default the device to /dev/kbd0.  Applications look for a keyboard
under that name, and /dev/keypad0 kept the matrix out of reach of every
one of them.

Signed-off-by: Jorge Guzman <jorge.gzm@gmail.com>
This commit is contained in:
Jorge Guzman 2026-07-30 15:33:33 -03:00 • committed by Alan C. Assis
parent f47fd03407
commit 59101fa206
2 changed files with 38 additions and 7 deletions
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21
include/nuttx/input/kmatrix.h
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@ -35,6 +35,21 @@
* Pre-processor Definitions
****************************************************************************/
/* A keymap entry is normally the character that the key produces. Wrap it
* in KMATRIX_SPECIAL() instead to declare that the entry is a value from
* enum kbd_keycode_e, so that the key is reported as a special key rather
* than as the character that happens to share its value:
*
* static const uint32_t g_keymap[] =
* {
* '1', '2', '3',
* KMATRIX_SPECIAL(KEYCODE_UP), KMATRIX_SPECIAL(KEYCODE_DOWN), '0',
* };
*/
#define KMATRIX_SPECIAL_FLAG (UINT32_C(1) << 31)
#define KMATRIX_SPECIAL(k) ((k) | KMATRIX_SPECIAL_FLAG)
/****************************************************************************
* Public Types
****************************************************************************/
@ -91,12 +106,12 @@ extern "C"
*
* Description:
* Configure and register a keyboard matrix device. This will create the
* /dev/keypadN device node and enable keyboard scanning.
* /dev/kbdN device node and enable keyboard scanning.
*
* Input Parameters:
* config - The keyboard matrix configuration. This structure is not
* copied; it must persist for the lifetime of the driver.
* devpath - The device path for the /dev/keypadN device.
* devpath - The device path for the /dev/kbdN device.
*
* Returned Value:
* Zero is returned on success. Otherwise, a negated errno value is
@ -125,7 +140,7 @@ struct ioexpander_dev_s;
* ioe_dev - IO expander device (from mcp23x08_initialize or
* pca9538_initialize)
* config - The keyboard matrix configuration (with callbacks set)
* devpath - The device path for the /dev/keypadN device
* devpath - The device path for the /dev/kbdN device
*
* Returned Value:
* Zero is returned on success. Otherwise, a negated errno value is