1ChromeOS EC Keyboard 2 3Google's ChromeOS EC Keyboard is a simple matrix keyboard implemented on 4a separate EC (Embedded Controller) device. It provides a message for reading 5key scans from the EC. These are then converted into keycodes for processing 6by the kernel. 7 8This binding is based on matrix-keymap.txt and extends/modifies it as follows: 9 10Required properties: 11- compatible: "google,cros-ec-keyb" 12 13Optional properties: 14- google,needs-ghost-filter: True to enable a ghost filter for the matrix 15keyboard. This is recommended if the EC does not have its own logic or 16hardware for this. 17 18 19Example: 20 21cros-ec-keyb { 22 compatible = "google,cros-ec-keyb"; 23 keypad,num-rows = <8>; 24 keypad,num-columns = <13>; 25 google,needs-ghost-filter; 26 /* 27 * Keymap entries take the form of 0xRRCCKKKK where 28 * RR=Row CC=Column KKKK=Key Code 29 * The values below are for a US keyboard layout and 30 * are taken from the Linux driver. Note that the 31 * 102ND key is not used for US keyboards. 32 */ 33 linux,keymap = < 34 /* CAPSLCK F1 B F10 */ 35 0x0001003a 0x0002003b 0x00030030 0x00040044 36 /* N = R_ALT ESC */ 37 0x00060031 0x0008000d 0x000a0064 0x01010001 38 /* F4 G F7 H */ 39 0x0102003e 0x01030022 0x01040041 0x01060023 40 /* ' F9 BKSPACE L_CTRL */ 41 0x01080028 0x01090043 0x010b000e 0x0200001d 42 /* TAB F3 T F6 */ 43 0x0201000f 0x0202003d 0x02030014 0x02040040 44 /* ] Y 102ND [ */ 45 0x0205001b 0x02060015 0x02070056 0x0208001a 46 /* F8 GRAVE F2 5 */ 47 0x02090042 0x03010029 0x0302003c 0x03030006 48 /* F5 6 - \ */ 49 0x0304003f 0x03060007 0x0308000c 0x030b002b 50 /* R_CTRL A D F */ 51 0x04000061 0x0401001e 0x04020020 0x04030021 52 /* S K J ; */ 53 0x0404001f 0x04050025 0x04060024 0x04080027 54 /* L ENTER Z C */ 55 0x04090026 0x040b001c 0x0501002c 0x0502002e 56 /* V X , M */ 57 0x0503002f 0x0504002d 0x05050033 0x05060032 58 /* L_SHIFT / . SPACE */ 59 0x0507002a 0x05080035 0x05090034 0x050B0039 60 /* 1 3 4 2 */ 61 0x06010002 0x06020004 0x06030005 0x06040003 62 /* 8 7 0 9 */ 63 0x06050009 0x06060008 0x0608000b 0x0609000a 64 /* L_ALT DOWN RIGHT Q */ 65 0x060a0038 0x060b006c 0x060c006a 0x07010010 66 /* E R W I */ 67 0x07020012 0x07030013 0x07040011 0x07050017 68 /* U R_SHIFT P O */ 69 0x07060016 0x07070036 0x07080019 0x07090018 70 /* UP LEFT */ 71 0x070b0067 0x070c0069>; 72}; 73