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PM / Runtime: Add sysfs debug files

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Add a few sysfs files relating to runtime power management for
advanced debug purposes:

runtime_enabled: is runtime PM enabled for this device? States
	are "enabled", "disabled", "forbidden" or a combination
	of the latter two.

runtime_status:	what state is the device in currently? E.g., it
	reports "suspended" for runtime-suspended devices, and
        "active" for active devices. NOTE: if runtime_enabled
	returns "disabled", the value of this file may not
	reflect its physical state.

runtime_usage: the runtime PM usage count of a device

runtime_active_kids: the runtime PM children usage count of a device, or
	0 if the ignore_children flag is set.

Also, CONFIG_PM_SLEEP_ADVANCED_DEBUG is not defined in any Kconfig
file, so replace it with CONFIG_PM_ADVANCED_DEBUG.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Dominik Brodowski 2010-04-23 20:32:23 +02:00 committed by Rafael J. Wysocki
parent d6f9cda1fd
commit c92445fadb
1 changed files with 62 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

65
drivers/base/power/sysfs.c
View File

@ -5,6 +5,7 @@
#include <linux/device.h>
#include <linux/string.h>
#include <linux/pm_runtime.h>
#include <asm/atomic.h>
#include "power.h"
/*
@ -143,7 +144,59 @@ wake_store(struct device * dev, struct device_attribute *attr,
static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store);
#ifdef CONFIG_PM_SLEEP_ADVANCED_DEBUG
#ifdef CONFIG_PM_ADVANCED_DEBUG
#ifdef CONFIG_PM_RUNTIME
static ssize_t rtpm_usagecount_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
}
static ssize_t rtpm_children_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", dev->power.ignore_children ?
0 : atomic_read(&dev->power.child_count));
}
static ssize_t rtpm_enabled_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
if ((dev->power.disable_depth) && (dev->power.runtime_auto == false))
return sprintf(buf, "disabled & forbidden\n");
else if (dev->power.disable_depth)
return sprintf(buf, "disabled\n");
else if (dev->power.runtime_auto == false)
return sprintf(buf, "forbidden\n");
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
static ssize_t async_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@ -170,15 +223,21 @@ static ssize_t async_store(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR(async, 0644, async_show, async_store);
#endif /* CONFIG_PM_SLEEP_ADVANCED_DEBUG */
#endif /* CONFIG_PM_ADVANCED_DEBUG */
static struct attribute * power_attrs[] = {
#ifdef CONFIG_PM_RUNTIME
&dev_attr_control.attr,
#endif
&dev_attr_wakeup.attr,
#ifdef CONFIG_PM_SLEEP_ADVANCED_DEBUG
#ifdef CONFIG_PM_ADVANCED_DEBUG
&dev_attr_async.attr,
#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
NULL,
};