diff options
| author | Wai-Hong Tam <waihong@google.com> | 2021-07-21 15:11:59 -0700 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2021-07-23 22:14:04 +0000 |
| commit | e8f6467d65f086a16ec33cb3cfd724086595d2f1 (patch) | |
| tree | e633d245112862427696f51e11d35a90a17e0442 /include/tablet_mode.h | |
| parent | 6521a7aa8d69c494e98667d1ff05ec2c2d784287 (diff) | |
| download | chrome-ec-e8f6467d65f086a16ec33cb3cfd724086595d2f1.tar.gz | |
tablet_mode: Fix the race condition of setting the tablet mode
There are 2 tablet mode triggers:
* Lid: when the lid angle close to 360 degree, either detected by
a GMR sensor or by the angle computed by 2 motion sensors.
* Base: when the detachable base is detached.
These 2 triggers set the tablet mode status, which as a boolean,
resulting a race condition.
This CL fixes the race condition. Each trigger updates its own bit. The
final tablet mode status is the OR of all bits.
BRANCH=Trogdor
BUG=b:193873098
TEST=Attached the base, checked tablet_mode enabled;
detached the base, checked tablet_mode disabled;
flip base to 360 degree, checked tablet_mode disabled;
move the base out of the lid, checked tablet_mode disabled.
Change-Id: Ia9d9d2d66c194796c1039cc8b746c8d1f28a4496
Signed-off-by: Wai-Hong Tam <waihong@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3044414
Reviewed-by: Ting Shen <phoenixshen@chromium.org>
Diffstat (limited to 'include/tablet_mode.h')
| -rw-r--r-- | include/tablet_mode.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/tablet_mode.h b/include/tablet_mode.h index b5a2f2f562..3e03d77f6a 100644 --- a/include/tablet_mode.h +++ b/include/tablet_mode.h @@ -13,12 +13,17 @@ */ int tablet_get_mode(void); +/* Bit mask of tablet mode trigger */ +#define TABLET_TRIGGER_LID BIT(0) +#define TABLET_TRIGGER_BASE BIT(1) + /** * Set tablet mode state * * @param mode 1: tablet mode. 0 clamshell mode. + * @param trigger: bitmask of the trigger, TABLET_TRIGGER_*. */ -void tablet_set_mode(int mode); +void tablet_set_mode(int mode, uint32_t trigger); /** * Disable tablet mode |