@@ -215,6 +215,35 @@ void mux_chip_free(struct mux_chip *mux_chip)
}
EXPORT_SYMBOL_GPL(mux_chip_free);
+/**
+ * mux_chip_resume() - restores the mux-chip state
+ * @mux_chip: The mux-chip to resume.
+ *
+ * Restores the mux-chip state.
+ *
+ * Return: Zero on success or a negative errno on error.
+ */
+int mux_chip_resume(struct mux_chip *mux_chip)
+{
+ int ret, i;
+
+ for (i = 0; i < mux_chip->controllers; ++i) {
+ struct mux_control *mux = &mux_chip->mux[i];
+
+ if (mux->cached_state == MUX_CACHE_UNKNOWN)
+ continue;
+
+ ret = mux_control_set(mux, mux->cached_state);
+ if (ret < 0) {
+ dev_err(&mux_chip->dev, "unable to restore state\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mux_chip_resume);
+
static void devm_mux_chip_release(struct device *dev, void *res)
{
struct mux_chip *mux_chip = *(struct mux_chip **)res;
@@ -88,6 +88,7 @@ struct mux_chip *mux_chip_alloc(struct device *dev,
int mux_chip_register(struct mux_chip *mux_chip);
void mux_chip_unregister(struct mux_chip *mux_chip);
void mux_chip_free(struct mux_chip *mux_chip);
+int mux_chip_resume(struct mux_chip *mux_chip);
struct mux_chip *devm_mux_chip_alloc(struct device *dev,
unsigned int controllers,
The mux_chip_resume() function restores a mux_chip using the cached state of each mux. Signed-off-by: Thomas Richard <thomas.richard@bootlin.com> --- drivers/mux/core.c | 29 +++++++++++++++++++++++++++++ include/linux/mux/driver.h | 1 + 2 files changed, 30 insertions(+)