[PATCH] regulator: Export regulator name via sysfs

From: Mark Brown
Date: Fri Oct 10 2008 - 10:33:31 EST


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@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
---

I've set the kernel version as 2.6.28 in the ABI file - if it doesn't
get merged in this merge window that'll obviously need to be updated.

Documentation/ABI/testing/sysfs-class-regulator | 13 +++++++++++++
drivers/regulator/core.c | 18 ++++++++++++++++++
2 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-class-regulator b/Documentation/ABI/testing/sysfs-class-regulator
index 79a4a75..0731ff2 100644
--- 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@xxxxxxxxxxxxxxx>
+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
--- 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),
--
1.5.6.5

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