Merge branch 'for-linus' of git://opensource.wolfsonmicro.com/regulator

[linux-beck.git] / drivers / regulator / core.c

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 87d9328f16950fc5069a93768a0e05682abdac41..67fa2a3297adc14afa059709d899defbb7aed9ba 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1552,6 +1552,68 @@ int regulator_force_disable(struct regulator *regulator)
 }
 EXPORT_SYMBOL_GPL(regulator_force_disable);
 
+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);
+
 static int _regulator_is_enabled(struct regulator_dev *rdev)
 {
        /* If we don't know then assume that the regulator is always on */
@@ -2622,6 +2684,7 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
        INIT_LIST_HEAD(&rdev->consumer_list);
        INIT_LIST_HEAD(&rdev->list);
        BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
+       INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
 
        /* preform any regulator specific init */
        if (init_data->regulator_init) {
@@ -2729,6 +2792,7 @@ void regulator_unregister(struct regulator_dev *rdev)
 #ifdef CONFIG_DEBUG_FS
        debugfs_remove_recursive(rdev->debugfs);
 #endif
+       flush_work_sync(&rdev->disable_work.work);
        WARN_ON(rdev->open_count);
        unset_regulator_supplies(rdev);
        list_del(&rdev->list);