+static void regulator_disable_work(struct work_struct *work)
+{
+ struct regulator_dev *rdev = container_of(work, struct regulator_dev,
+ disable_work.work);
+ int count, i, ret;
+
+ mutex_lock(&rdev->mutex);
+
+ BUG_ON(!rdev->deferred_disables);
+
+ count = rdev->deferred_disables;
+ rdev->deferred_disables = 0;
+
+ for (i = 0; i < count; i++) {
+ ret = _regulator_disable(rdev);
+ if (ret != 0)
+ rdev_err(rdev, "Deferred disable failed: %d\n", ret);
+ }
+
+ mutex_unlock(&rdev->mutex);
+
+ if (rdev->supply) {
+ for (i = 0; i < count; i++) {
+ ret = regulator_disable(rdev->supply);
+ if (ret != 0) {
+ rdev_err(rdev,
+ "Supply disable failed: %d\n", ret);
+ }
+ }
+ }
+}
+
+/**
+ * regulator_disable_deferred - disable regulator output with delay
+ * @regulator: regulator source
+ * @ms: miliseconds until the regulator is disabled
+ *
+ * Execute regulator_disable() on the regulator after a delay. This
+ * is intended for use with devices that require some time to quiesce.
+ *
+ * NOTE: this will only disable the regulator output if no other consumer
+ * devices have it enabled, the regulator device supports disabling and
+ * machine constraints permit this operation.
+ */
+int regulator_disable_deferred(struct regulator *regulator, int ms)
+{
+ struct regulator_dev *rdev = regulator->rdev;
+ int ret;
+
+ mutex_lock(&rdev->mutex);
+ rdev->deferred_disables++;
+ mutex_unlock(&rdev->mutex);
+
+ ret = schedule_delayed_work(&rdev->disable_work,
+ msecs_to_jiffies(ms));
+ if (ret < 0)
+ return ret;
+ else
+ return 0;
+}
+EXPORT_SYMBOL_GPL(regulator_disable_deferred);
+