ChromeOS EC Keyboard
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Google's ChromeOS EC Keyboard is a simple matrix keyboard implemented on
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a separate EC (Embedded Controller) device. It provides a message for reading
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key scans from the EC. These are then converted into keycodes for processing
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by the kernel.
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This binding is based on matrix-keymap.txt and extends/modifies it as follows:
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Required properties:
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- compatible: "google,cros-ec-keyb"
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Optional properties:
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- google,needs-ghost-filter: True to enable a ghost filter for the matrix
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keyboard. This is recommended if the EC does not have its own logic or
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hardware for this.
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Example:
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cros-ec-keyb {
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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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/*
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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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