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authorDominik Brodowski <linux@dominikbrodowski.net>2010-04-23 20:32:23 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2010-05-10 23:08:17 +0200
commitc92445fadb9179d811b5cb044947ad4712403541 (patch)
tree7e314fd096afdd220169068a281a1e8e0a8b1e7d /drivers/base
parentd6f9cda1fd241bc7a1d896da94950fd972eca9b7 (diff)
downloadop-kernel-dev-c92445fadb9179d811b5cb044947ad4712403541.zip
op-kernel-dev-c92445fadb9179d811b5cb044947ad4712403541.tar.gz
PM / Runtime: Add sysfs debug files
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>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/sysfs.c65
1 files changed, 62 insertions, 3 deletions
diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
index 86fd937..a4c33bc 100644
--- a/drivers/base/power/sysfs.c
+++ b/drivers/base/power/sysfs.c
@@ -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,
};
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