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Diffstat (limited to 'Documentation/input/event-codes.txt')
| -rw-r--r-- | Documentation/input/event-codes.txt | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/input/event-codes.txt b/Documentation/input/event-codes.txt index 53305bd0818..f1ea2c69648 100644 --- a/Documentation/input/event-codes.txt +++ b/Documentation/input/event-codes.txt @@ -196,6 +196,17 @@ EV_MSC: EV_MSC events are used for input and output events that do not fall under other categories. +A few EV_MSC codes have special meaning: + +* MSC_TIMESTAMP: + - Used to report the number of microseconds since the last reset. This event + should be coded as an uint32 value, which is allowed to wrap around with + no special consequence. It is assumed that the time difference between two + consecutive events is reliable on a reasonable time scale (hours). + A reset to zero can happen, in which case the time since the last event is + unknown. If the device does not provide this information, the driver must + not provide it to user space. + EV_LED: ---------- EV_LED events are used for input and output to set and query the state of |