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regulator: add get_status()

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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>
This commit is contained in:
David Brownell
2009-01-14 23:03:17 -08:00
committed by Liam Girdwood
parent 93e14baa44
commit 853116a105
3 changed files with 111 additions and 9 deletions
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46
drivers/regulator/core.c
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@@ -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) {