ec/google/chromeec: Add host command EC_CMD_GET_KEYBD_CONFIG

Add command to query the EC for the keyboard layout. Also
add supporting data structures for the exchange.

Signed-off-by: Rajat Jain <rajatja@google.com>
Change-Id: I26aff6dd0e701e0cecb3b66bc54c5a23688f0109
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40030
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/ec/google/chromeec/ec_commands.h

@@ -6079,6 +6079,83 @@ enum keyboard_button_type {
 
 	KEYBOARD_BUTTON_COUNT
 };
+/*****************************************************************************/
+/*
+ *  "Get the Keyboard Config". An EC implementing this command is expected to be
+ *  vivaldi capable, i.e. can send action codes for the top row keys.
+ *  Additionally, capability to send function codes for the same keys is
+ *  optional and acceptable.
+ *
+ *  Note: If the top row can generate both function and action codes by
+ *  using a dedicated Fn key, it does not matter whether the key sends
+ *  "function" or "action" codes by default. In both cases, the response
+ *  for this command will look the same.
+ */
+#define EC_CMD_GET_KEYBD_CONFIG 0x012A
+
+/* Possible values for the top row keys */
+enum action_key {
+	TK_ABSENT = 0,
+	TK_BACK = 1,
+	TK_FORWARD = 2,
+	TK_REFRESH = 3,
+	TK_FULLSCREEN = 4,
+	TK_OVERVIEW = 5,
+	TK_BRIGHTNESS_DOWN = 6,
+	TK_BRIGHTNESS_UP = 7,
+	TK_VOL_MUTE = 8,
+	TK_VOL_DOWN = 9,
+	TK_VOL_UP = 10,
+	TK_SNAPSHOT = 11,
+	TK_PRIVACY_SCRN_TOGGLE = 12,
+	TK_KBD_BKLIGHT_DOWN = 13,
+	TK_KBD_BKLIGHT_UP = 14,
+	TK_PLAY_PAUSE = 15,
+	TK_NEXT_TRACK = 16,
+	TK_PREV_TRACK = 17,
+};
+
+/*
+ * Max & Min number of top row keys, excluding Esc and Screenlock keys.
+ * If this needs to change, please create a new version of the command.
+ */
+#define MAX_TOP_ROW_KEYS 15
+#define MIN_TOP_ROW_KEYS 10
+
+/*
+ * Is the keyboard capable of sending function keys *in addition to*
+ * action keys. This is possible for e.g. if the keyboard has a
+ * dedicated Fn key.
+ */
+#define KEYBD_CAP_FUNCTION_KEYS		BIT(0)
+/*
+ * Whether the keyboard has a dedicated numeric keyboard.
+ */
+#define KEYBD_CAP_NUMERIC_KEYPAD	BIT(1)
+/*
+ * Whether the keyboard has a screenlock key.
+ */
+#define KEYBD_CAP_SCRNLOCK_KEY		BIT(2)
+
+struct ec_response_keybd_config {
+	/*
+	 *  Number of top row keys, excluding Esc and Screenlock.
+	 *  If this is 0, all Vivaldi keyboard code is disabled.
+	 *  (i.e. does not expose any tables to the kernel).
+	 */
+	uint8_t num_top_row_keys;
+
+	/*
+	 *  The action keys in the top row, in order from left to right.
+	 *  The values are filled from enum action_key. Esc and Screenlock
+	 *  keys are not considered part of top row keys.
+	 */
+	uint8_t action_keys[MAX_TOP_ROW_KEYS];
+
+	/* Capability flags */
+	uint8_t capabilities;
+
+} __ec_align1;
 
 /*****************************************************************************/
 /* The command range 0x200-0x2FF is reserved for Rotor. */