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>

diff --git a/Documentation/ABI/testing/sysfs-class-regulator b/Documentation/ABI/testing/sysfs-class-regulator
index 84e66fd..3731f6f 100644 (file)
--- a/Documentation/ABI/testing/sysfs-class-regulator
+++ b/Documentation/ABI/testing/sysfs-class-regulator
@@ -157,6 +157,19 @@ Description:
                platform code.
 
 
+What:          /sys/class/regulator/.../name
+Date:          October 2008
+KernelVersion: 2.6.28
+Contact:       Liam Girdwood <lrg@slimlogic.co.uk>
+Description:
+               Each regulator directory will contain a field called
+               name. This holds a string identifying the regulator for
+               display purposes.
+
+               NOTE: this will be empty if no suitable name is provided
+               by platform or regulator drivers.
+
+
 What:          /sys/class/regulator/.../num_users
 Date:          April 2008
 KernelVersion: 2.6.26

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 9a6757d..02a7744 100644 (file)
--- 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),