regulator: Export regulator name via sysfs

Provide a new file 'name' in the regulator sysfs class with a human
readable name for the regulator for use in applications.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 9a6757decd3d..02a774424e8d 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -241,6 +241,22 @@ static ssize_t regulator_uA_show(struct device *dev,
         return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
 }
 
+static ssize_t regulator_name_show(struct device *dev,
+                             struct device_attribute *attr, char *buf)
+{
+        struct regulator_dev *rdev = dev_get_drvdata(dev);
+        const char *name;
+
+        if (rdev->constraints->name)
+                name = rdev->constraints->name;
+        else if (rdev->desc->name)
+                name = rdev->desc->name;
+        else
+                name = "";
+
+        return sprintf(buf, "%s\n", name);
+}
+
 static ssize_t regulator_opmode_show(struct device *dev,
                                     struct device_attribute *attr, char *buf)
 {
@@ -473,7 +489,9 @@ static ssize_t regulator_suspend_standby_state_show(struct device *dev,
         else
                 return sprintf(buf, "disabled\n");
 }
+
 static struct device_attribute regulator_dev_attrs[] = {
+        __ATTR(name, 0444, regulator_name_show, NULL),
         __ATTR(microvolts, 0444, regulator_uV_show, NULL),
         __ATTR(microamps, 0444, regulator_uA_show, NULL),
         __ATTR(opmode, 0444, regulator_opmode_show, NULL),