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authorDavid Brownell <dbrownell@users.sourceforge.net>2009-01-14 23:03:17 -0800
committerLiam Girdwood <lrg@slimlogic.co.uk>2009-03-31 09:56:20 +0100
commit853116a10544206b6b2cf42ebc9d78fba2668888 (patch)
treebc233aa343638575b36e300e863ce3d477374f57 /drivers/regulator
parent93e14baa4494607efe81608725f591e3ba31e3c1 (diff)
regulator: add get_status()
Based on previous LKML discussions: * Update docs for regulator sysfs class attributes to highlight the fact that all current attributes are intended to be control inputs, including notably "state" and "opmode" which previously implied otherwise. * Define a new regulator driver get_status() method, which is the first method reporting regulator outputs instead of inputs. It can report on/off and error status; or instead of simply "on", report the actual operating mode. For the moment, this is a sysfs-only interface, not accessible to regulator clients. Such clients can use the current notification interfaces to detect errors, if the regulator reports them. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'drivers/regulator')
-rw-r--r--drivers/regulator/core.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index f511a406fca..0ff95c3ccf5 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -312,6 +312,47 @@ static ssize_t regulator_state_show(struct device *dev,
}
static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
+static ssize_t regulator_status_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct regulator_dev *rdev = dev_get_drvdata(dev);
+ int status;
+ char *label;
+
+ status = rdev->desc->ops->get_status(rdev);
+ if (status < 0)
+ return status;
+
+ switch (status) {
+ case REGULATOR_STATUS_OFF:
+ label = "off";
+ break;
+ case REGULATOR_STATUS_ON:
+ label = "on";
+ break;
+ case REGULATOR_STATUS_ERROR:
+ label = "error";
+ break;
+ case REGULATOR_STATUS_FAST:
+ label = "fast";
+ break;
+ case REGULATOR_STATUS_NORMAL:
+ label = "normal";
+ break;
+ case REGULATOR_STATUS_IDLE:
+ label = "idle";
+ break;
+ case REGULATOR_STATUS_STANDBY:
+ label = "standby";
+ break;
+ default:
+ return -ERANGE;
+ }
+
+ return sprintf(buf, "%s\n", label);
+}
+static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
+
static ssize_t regulator_min_uA_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -1744,6 +1785,11 @@ static int add_regulator_attributes(struct regulator_dev *rdev)
if (status < 0)
return status;
}
+ if (ops->get_status) {
+ status = device_create_file(dev, &dev_attr_status);
+ if (status < 0)
+ return status;
+ }
/* some attributes are type-specific */
if (rdev->desc->type == REGULATOR_CURRENT) {