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| author | Mary Ruthven <mruthven@chromium.org> | 2017-01-18 17:39:44 -0800 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2017-01-23 13:38:22 -0800 |
| commit | 8f118e01679402232ae70882345b4b919f980723 (patch) | |
| tree | 785cefe6c9241a6aa8aa9e6857a97e79eb8c6c3c /common/device_state.c | |
| parent | 38c5661f14f8a4be018e4b6e1641071c5f1fe866 (diff) | |
| download | chrome-ec-8f118e01679402232ae70882345b4b919f980723.tar.gz | |
device_state: signal if device_set_state changed the state
Each device keeps track of the last known state. If device_set_state
updates the device state to a new known state, then return true. Cr50
uses this returned value to check if the state has changed instead of
calculating it itself.
BUG=none
BRANCH=none
TEST=device detection still works
Change-Id: I8afac178c2c731def6f4f62ff7023fe169ec1479
Signed-off-by: Mary Ruthven <mruthven@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/430970
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'common/device_state.c')
| -rw-r--r-- | common/device_state.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/common/device_state.c b/common/device_state.c index ee82846b84..fd9ebcf14b 100644 --- a/common/device_state.c +++ b/common/device_state.c @@ -12,15 +12,16 @@ int device_get_state(enum device_type device) return device_states[device].state; } -void device_set_state(enum device_type device, enum device_state state) +int device_set_state(enum device_type device, enum device_state state) { - if (device_states[device].state == state) - return; + device_states[device].state = state; - if (state != DEVICE_STATE_UNKNOWN) + if (state != DEVICE_STATE_UNKNOWN && + device_states[device].last_known_state != state) { device_states[device].last_known_state = state; - - device_states[device].state = state; + return 1; + } + return 0; } static void check_device_state(void) |