1 Input: sysrq reset sequence 1 Input: sysrq reset sequence
2 2
3 A simple binding to represent a set of keys as 3 A simple binding to represent a set of keys as described in
4 include/uapi/linux/input.h. This is to communi 4 include/uapi/linux/input.h. This is to communicate a sequence of keys to the
5 sysrq driver. Upon holding the keys for a spec 5 sysrq driver. Upon holding the keys for a specified amount of time (if
6 specified) the system is sync'ed and reset. 6 specified) the system is sync'ed and reset.
7 7
8 Key sequences are global to the system but all 8 Key sequences are global to the system but all the keys in a set must be coming
9 from the same input device. 9 from the same input device.
10 10
11 The /chosen node should contain a 'linux,sysrq 11 The /chosen node should contain a 'linux,sysrq-reset-seq' child node to define
12 a set of keys. 12 a set of keys.
13 13
14 Required property: 14 Required property:
15 keyset: array of Linux keycodes, one keycode p 15 keyset: array of Linux keycodes, one keycode per cell.
16 16
17 Optional property: 17 Optional property:
18 timeout-ms: duration keys must be pressed toge 18 timeout-ms: duration keys must be pressed together in milliseconds before
19 generating a sysrq. If omitted the system is r 19 generating a sysrq. If omitted the system is rebooted immediately when a valid
20 sequence has been recognized. 20 sequence has been recognized.
21 21
22 Example: 22 Example:
23 23
24 chosen { 24 chosen {
25 linux,sysrq-reset-seq { 25 linux,sysrq-reset-seq {
26 keyset = <0x03 26 keyset = <0x03
27 0x04 27 0x04
28 0x0a>; 28 0x0a>;
29 timeout-ms = <3000>; 29 timeout-ms = <3000>;
30 }; 30 };
31 }; 31 };
32 32
33 Would represent KEY_2, KEY_3 and KEY_9. 33 Would represent KEY_2, KEY_3 and KEY_9.
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