| Mathieu J. Poirier | 4c076eb | 2013-08-03 17:22:08 -0700 | [diff] [blame] | 1 | Input: sysrq reset sequence |
| 2 | |
| 3 | A simple binding to represent a set of keys as described in |
| 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 specified amount of time (if |
| 6 | specified) the system is sync'ed and reset. |
| 7 | |
| 8 | Key sequences are global to the system but all the keys in a set must be coming |
| 9 | from the same input device. |
| 10 | |
| 11 | The /chosen node should contain a 'linux,sysrq-reset-seq' child node to define |
| 12 | a set of keys. |
| 13 | |
| 14 | Required property: |
| 15 | sysrq-reset-seq: array of Linux keycodes, one keycode per cell. |
| 16 | |
| 17 | Optional property: |
| 18 | timeout-ms: duration keys must be pressed together in milliseconds before |
| 19 | generating a sysrq. If omitted the system is rebooted immediately when a valid |
| 20 | sequence has been recognized. |
| 21 | |
| 22 | Example: |
| 23 | |
| 24 | chosen { |
| 25 | linux,sysrq-reset-seq { |
| 26 | keyset = <0x03 |
| 27 | 0x04 |
| 28 | 0x0a>; |
| 29 | timeout-ms = <3000>; |
| 30 | }; |
| 31 | }; |
| 32 | |
| 33 | Would represent KEY_2, KEY_3 and KEY_9. |