arch/x86/acpi: Add code to generate ACPI for PS2 keyboards

Add new file to generate ACPI _DSD code for PS2 keyboards. The
following 2 device properties are generated as needed:

function-row-phymap: A list of ordered scancodes for function row.

linux,keymap: Symantically, this is an array of "scancode,keycode"
tuple entries. Each entry teaches linux the keycode corresponding
to a scancode.

Signed-off-by: Rajat Jain <rajatja@google.com>
Change-Id: I5ee05173106a125793e91c263610731543c85472
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40031
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/src/arch/x86/include/arch/acpigen_ps2_keybd.h b/src/arch/x86/include/arch/acpigen_ps2_keybd.h
new file mode 100644
index 0000000000..c0228bca16
--- /dev/null
+++ b/src/arch/x86/include/arch/acpigen_ps2_keybd.h
@@ -0,0 +1,41 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef __ACPIGEN_PS2_KEYBD_H__
+#define __ACPIGEN_PS2_KEYBD_H__
+
+#include <types.h>
+
+enum ps2_action_key {
+	PS2_KEY_ABSENT = 0,
+	PS2_KEY_BACK,
+	PS2_KEY_FORWARD,
+	PS2_KEY_REFRESH,
+	PS2_KEY_FULLSCREEN,
+	PS2_KEY_OVERVIEW,
+	PS2_KEY_BRIGHTNESS_DOWN,
+	PS2_KEY_BRIGHTNESS_UP,
+	PS2_KEY_VOL_MUTE,
+	PS2_KEY_VOL_DOWN,
+	PS2_KEY_VOL_UP,
+	PS2_KEY_SNAPSHOT,
+	PS2_KEY_PRIVACY_SCRN_TOGGLE,
+	PS2_KEY_KBD_BKLIGHT_DOWN,
+	PS2_KEY_KBD_BKLIGHT_UP,
+	PS2_KEY_PLAY_PAUSE,
+	PS2_KEY_NEXT_TRACK,
+	PS2_KEY_PREV_TRACK,
+};
+
+#define PS2_MIN_TOP_ROW_KEYS		10
+#define PS2_MAX_TOP_ROW_KEYS		15
+
+void acpigen_ps2_keyboard_dsd(const char *scope, uint8_t num_top_row_keys,
+			      enum ps2_action_key action_keys[],
+			      bool can_send_function_keys,
+			      bool has_numeric_keypad, bool has_scrnlock_key);
+
+#endif /* __ACPIGEN_PS2_KEYBD_H__ */