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| author | Rob Barnes <robbarnes@google.com> | 2022-01-05 10:31:40 -0700 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2022-01-13 18:03:16 +0000 |
| commit | f0accb6b9c809bb18ca7f9d0c69fdf8527408678 (patch) | |
| tree | f92989e8c0b3a9f57f48bf30e666e04a92e06350 /include | |
| parent | 9a74b1cdbb5f9024d29393ba5c59c626051d4e82 (diff) | |
| download | chrome-ec-f0accb6b9c809bb18ca7f9d0c69fdf8527408678.tar.gz | |
ioexpander: Introduce GPIO save and restore functions
Add common ioexpander functions for saving a restoring GPIO state. This
is useful for restoring GPIO after the ioexpander is reset.
BUG=b:211452276
BRANCH=None
TEST=ioexpander state restored on nipperkin
Change-Id: Id81c5457f1c33fdf7490a963317e11a2b9441831
Signed-off-by: Rob Barnes <robbarnes@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3368321
Reviewed-by: Diana Z <dzigterman@chromium.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/ioexpander.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/ioexpander.h b/include/ioexpander.h index 4024a5a267..fb47b874a5 100644 --- a/include/ioexpander.h +++ b/include/ioexpander.h @@ -179,4 +179,24 @@ const char *ioex_get_name(enum ioex_signal signal); */ int signal_is_ioex(int signal); +/* + * Save gpio state of IO expander + * + * @param ioex IO expander chip's port number + * @param state Buffer to hold gpio state + * @param state_len Length of state buffer, IOEX_COUNT is recommended + * @return EC_SUCCESS if successful, non-zero if error. + */ +int ioex_save_gpio_state(int ioex, int *state, int state_len); + +/* + * Restore gpio state of IO expander + * + * @param ioex IO expander chip's port number + * @param state Buffer with gpio state saved by ioex_save_gpio_state + * @param state_len Length of state buffer, IOEX_COUNT is recommended + * @return EC_SUCCESS if successful, non-zero if error. + */ +int ioex_restore_gpio_state(int ioex, const int *state, int state_len); + #endif /* __CROS_EC_IOEXPANDER_H */ |