aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--drivers/regulator/core.c88
-rw-r--r--include/linux/regulator/consumer.h2
-rw-r--r--include/linux/regulator/driver.h2
3 files changed, 78 insertions, 14 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 24e05b7607b..68549008582 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1025,25 +1025,15 @@ overflow_err:
return NULL;
}
-/**
- * regulator_get - lookup and obtain a reference to a regulator.
- * @dev: device for regulator "consumer"
- * @id: Supply name or regulator ID.
- *
- * Returns a struct regulator corresponding to the regulator producer,
- * or IS_ERR() condition containing errno.
- *
- * Use of supply names configured via regulator_set_device_supply() is
- * strongly encouraged. It is recommended that the supply name used
- * should match the name used for the supply and/or the relevant
- * device pins in the datasheet.
- */
-struct regulator *regulator_get(struct device *dev, const char *id)
+/* Internal regulator request function */
+static struct regulator *_regulator_get(struct device *dev, const char *id,
+ int exclusive)
{
struct regulator_dev *rdev;
struct regulator_map *map;
struct regulator *regulator = ERR_PTR(-ENODEV);
const char *devname = NULL;
+ int ret;
if (id == NULL) {
printk(KERN_ERR "regulator: get() with no identifier\n");
@@ -1070,6 +1060,16 @@ struct regulator *regulator_get(struct device *dev, const char *id)
return regulator;
found:
+ if (rdev->exclusive) {
+ regulator = ERR_PTR(-EPERM);
+ goto out;
+ }
+
+ if (exclusive && rdev->open_count) {
+ regulator = ERR_PTR(-EBUSY);
+ goto out;
+ }
+
if (!try_module_get(rdev->owner))
goto out;
@@ -1079,13 +1079,70 @@ found:
module_put(rdev->owner);
}
+ rdev->open_count++;
+ if (exclusive) {
+ rdev->exclusive = 1;
+
+ ret = _regulator_is_enabled(rdev);
+ if (ret > 0)
+ rdev->use_count = 1;
+ else
+ rdev->use_count = 0;
+ }
+
out:
mutex_unlock(&regulator_list_mutex);
+
return regulator;
}
+
+/**
+ * regulator_get - lookup and obtain a reference to a regulator.
+ * @dev: device for regulator "consumer"
+ * @id: Supply name or regulator ID.
+ *
+ * Returns a struct regulator corresponding to the regulator producer,
+ * or IS_ERR() condition containing errno.
+ *
+ * Use of supply names configured via regulator_set_device_supply() is
+ * strongly encouraged. It is recommended that the supply name used
+ * should match the name used for the supply and/or the relevant
+ * device pins in the datasheet.
+ */
+struct regulator *regulator_get(struct device *dev, const char *id)
+{
+ return _regulator_get(dev, id, 0);
+}
EXPORT_SYMBOL_GPL(regulator_get);
/**
+ * regulator_get_exclusive - obtain exclusive access to a regulator.
+ * @dev: device for regulator "consumer"
+ * @id: Supply name or regulator ID.
+ *
+ * Returns a struct regulator corresponding to the regulator producer,
+ * or IS_ERR() condition containing errno. Other consumers will be
+ * unable to obtain this reference is held and the use count for the
+ * regulator will be initialised to reflect the current state of the
+ * regulator.
+ *
+ * This is intended for use by consumers which cannot tolerate shared
+ * use of the regulator such as those which need to force the
+ * regulator off for correct operation of the hardware they are
+ * controlling.
+ *
+ * Use of supply names configured via regulator_set_device_supply() is
+ * strongly encouraged. It is recommended that the supply name used
+ * should match the name used for the supply and/or the relevant
+ * device pins in the datasheet.
+ */
+struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
+{
+ return _regulator_get(dev, id, 1);
+}
+EXPORT_SYMBOL_GPL(regulator_get_exclusive);
+
+/**
* regulator_put - "free" the regulator source
* @regulator: regulator source
*
@@ -1113,6 +1170,9 @@ void regulator_put(struct regulator *regulator)
list_del(&regulator->list);
kfree(regulator);
+ rdev->open_count--;
+ rdev->exclusive = 0;
+
module_put(rdev->owner);
mutex_unlock(&regulator_list_mutex);
}
diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index 277f4b964df..976b57b6912 100644
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -125,6 +125,8 @@ struct regulator_bulk_data {
/* regulator get and put */
struct regulator *__must_check regulator_get(struct device *dev,
const char *id);
+struct regulator *__must_check regulator_get_exclusive(struct device *dev,
+ const char *id);
void regulator_put(struct regulator *regulator);
/* regulator output control and status */
diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index ce1be708ca1..73c9cd6cda7 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -162,6 +162,8 @@ struct regulator_desc {
struct regulator_dev {
struct regulator_desc *desc;
int use_count;
+ int open_count;
+ int exclusive;
/* lists we belong to */
struct list_head list; /* list of all regulators */