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PM / Runtime: Make runtime_status attribute not debug-only (v. 2) 

This patch (as1404b) makes the runtime_status sysfs attribute available
even in the absence of CONFIG_PM_ADVANCED_DEBUG, and it changes the
routine to display "unsupported" when runtime PM is disabled for a
device.  Although not strictly 100% accurate, this will almost always
be correct.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Alan Stern 2010-07-08 00:05:37 +02:00 committed by Rafael J. Wysocki
parent 4eb241e569
commit 0fcb4eef82
1 changed files with 33 additions and 20 deletions
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53
drivers/base/power/sysfs.c
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@ -110,6 +110,38 @@ static ssize_t control_store(struct device * dev, struct device_attribute *attr,
}
static DEVICE_ATTR(control, 0644, control_show, control_store);
static ssize_t rtpm_status_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
const char *p;
if (dev->power.runtime_error) {
p = "error\n";
} else if (dev->power.disable_depth) {
p = "unsupported\n";
} else {
switch (dev->power.runtime_status) {
case RPM_SUSPENDED:
p = "suspended\n";
break;
case RPM_SUSPENDING:
p = "suspending\n";
break;
case RPM_RESUMING:
p = "resuming\n";
break;
case RPM_ACTIVE:
p = "active\n";
break;
default:
return -EIO;
}
}
return sprintf(buf, p);
}
static DEVICE_ATTR(runtime_status, 0444, rtpm_status_show, NULL);
#endif
static ssize_t
@ -184,27 +216,8 @@ static ssize_t rtpm_enabled_show(struct device *dev,
return sprintf(buf, "enabled\n");
}
static ssize_t rtpm_status_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
if (dev->power.runtime_error)
return sprintf(buf, "error\n");
switch (dev->power.runtime_status) {
case RPM_SUSPENDED:
return sprintf(buf, "suspended\n");
case RPM_SUSPENDING:
return sprintf(buf, "suspending\n");
case RPM_RESUMING:
return sprintf(buf, "resuming\n");
case RPM_ACTIVE:
return sprintf(buf, "active\n");
}
return -EIO;
}
static DEVICE_ATTR(runtime_usage, 0444, rtpm_usagecount_show, NULL);
static DEVICE_ATTR(runtime_active_kids, 0444, rtpm_children_show, NULL);
static DEVICE_ATTR(runtime_status, 0444, rtpm_status_show, NULL);
static DEVICE_ATTR(runtime_enabled, 0444, rtpm_enabled_show, NULL);
#endif
@ -240,6 +253,7 @@ static DEVICE_ATTR(async, 0644, async_show, async_store);
static struct attribute * power_attrs[] = {
#ifdef CONFIG_PM_RUNTIME
&dev_attr_control.attr,
&dev_attr_runtime_status.attr,
#endif
&dev_attr_wakeup.attr,
#ifdef CONFIG_PM_SLEEP
@ -250,7 +264,6 @@ static struct attribute * power_attrs[] = {
#ifdef CONFIG_PM_RUNTIME
&dev_attr_runtime_usage.attr,
&dev_attr_runtime_active_kids.attr,
&dev_attr_runtime_status.attr,
&dev_attr_runtime_enabled.attr,
#endif
#endif