2023-08-30 17:31:07 +02:00
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/input/google,cros-ec-keyb.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: ChromeOS EC Keyboard
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maintainers:
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- Simon Glass <sjg@chromium.org>
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- Benson Leung <bleung@chromium.org>
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description: |
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Google's ChromeOS EC Keyboard is a simple matrix keyboard
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implemented on a separate EC (Embedded Controller) device. It provides
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a message for reading key scans from the EC. These are then converted
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into keycodes for processing by the kernel. This device also supports
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switches/buttons like power and volume buttons.
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properties:
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compatible:
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oneOf:
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- description: ChromeOS EC with only buttons/switches
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const: google,cros-ec-keyb-switches
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- description: ChromeOS EC with keyboard and possibly buttons/switches
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const: google,cros-ec-keyb
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google,needs-ghost-filter:
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description:
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Enable a ghost filter for the matrix keyboard. This is recommended
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if the EC does not have its own logic or hardware for this.
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type: boolean
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function-row-physmap:
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$ref: /schemas/types.yaml#/definitions/uint32-array
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minItems: 1
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maxItems: 15
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description: |
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An ordered u32 array describing the rows/columns (in the scan matrix)
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of top row keys from physical left (KEY_F1) to right. Each entry
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encodes the row/column as:
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(((row) & 0xFF) << 24) | (((column) & 0xFF) << 16)
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where the lower 16 bits are reserved. This property is specified only
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when the keyboard has a custom design for the top row keys.
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dependencies:
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2023-10-24 12:59:35 +02:00
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function-row-physmap: [ 'linux,keymap' ]
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2023-08-30 17:31:07 +02:00
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google,needs-ghost-filter: [ 'linux,keymap' ]
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required:
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- compatible
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if:
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properties:
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compatible:
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contains:
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const: google,cros-ec-keyb
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then:
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2023-10-24 12:59:35 +02:00
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$ref: /schemas/input/matrix-keymap.yaml#
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2023-08-30 17:31:07 +02:00
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required:
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- keypad,num-rows
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- keypad,num-columns
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- linux,keymap
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unevaluatedProperties: false
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examples:
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- |
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#include <dt-bindings/input/input.h>
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keyboard-controller {
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compatible = "google,cros-ec-keyb";
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keypad,num-rows = <8>;
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keypad,num-columns = <13>;
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google,needs-ghost-filter;
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function-row-physmap = <
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MATRIX_KEY(0x00, 0x02, 0) /* T1 */
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MATRIX_KEY(0x03, 0x02, 0) /* T2 */
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MATRIX_KEY(0x02, 0x02, 0) /* T3 */
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MATRIX_KEY(0x01, 0x02, 0) /* T4 */
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MATRIX_KEY(0x03, 0x04, 0) /* T5 */
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MATRIX_KEY(0x02, 0x04, 0) /* T6 */
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MATRIX_KEY(0x01, 0x04, 0) /* T7 */
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MATRIX_KEY(0x02, 0x09, 0) /* T8 */
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MATRIX_KEY(0x01, 0x09, 0) /* T9 */
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MATRIX_KEY(0x00, 0x04, 0) /* T10 */
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>;
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/*
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* Keymap entries take the form of 0xRRCCKKKK where
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* RR=Row CC=Column KKKK=Key Code
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* The values below are for a US keyboard layout and
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* are taken from the Linux driver. Note that the
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* 102ND key is not used for US keyboards.
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*/
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linux,keymap = <
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/* CAPSLCK F1 B F10 */
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0x0001003a 0x0002003b 0x00030030 0x00040044
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/* N = R_ALT ESC */
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0x00060031 0x0008000d 0x000a0064 0x01010001
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/* F4 G F7 H */
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0x0102003e 0x01030022 0x01040041 0x01060023
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/* ' F9 BKSPACE L_CTRL */
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0x01080028 0x01090043 0x010b000e 0x0200001d
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/* TAB F3 T F6 */
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0x0201000f 0x0202003d 0x02030014 0x02040040
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/* ] Y 102ND [ */
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0x0205001b 0x02060015 0x02070056 0x0208001a
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/* F8 GRAVE F2 5 */
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0x02090042 0x03010029 0x0302003c 0x03030006
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/* F5 6 - \ */
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0x0304003f 0x03060007 0x0308000c 0x030b002b
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/* R_CTRL A D F */
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0x04000061 0x0401001e 0x04020020 0x04030021
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/* S K J ; */
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0x0404001f 0x04050025 0x04060024 0x04080027
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/* L ENTER Z C */
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0x04090026 0x040b001c 0x0501002c 0x0502002e
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/* V X , M */
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0x0503002f 0x0504002d 0x05050033 0x05060032
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/* L_SHIFT / . SPACE */
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0x0507002a 0x05080035 0x05090034 0x050B0039
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/* 1 3 4 2 */
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0x06010002 0x06020004 0x06030005 0x06040003
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/* 8 7 0 9 */
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0x06050009 0x06060008 0x0608000b 0x0609000a
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/* L_ALT DOWN RIGHT Q */
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0x060a0038 0x060b006c 0x060c006a 0x07010010
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/* E R W I */
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0x07020012 0x07030013 0x07040011 0x07050017
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/* U R_SHIFT P O */
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0x07060016 0x07070036 0x07080019 0x07090018
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/* UP LEFT */
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0x070b0067 0x070c0069>;
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};
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- |
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/* No matrix keyboard, just buttons/switches */
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keyboard-controller {
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compatible = "google,cros-ec-keyb-switches";
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};
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...
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