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authorRafael J. Wysocki <rjw@sisk.pl>2011-02-08 23:26:02 +0100
committerRafael J. Wysocki <rjw@sisk.pl>2011-03-15 00:43:14 +0100
commitcb8f51bdadb7969139c2e39c2defd4cde98c1ea8 (patch)
treea6d6e20878460d50b8f61d5fe3237818c54065eb /drivers/base
parent4681b17154b3fd81f898802262985f662344e6ed (diff)
downloadlinux-cb8f51bdadb7969139c2e39c2defd4cde98c1ea8.tar.bz2
PM: Do not create wakeup sysfs files for devices that cannot wake up
Currently, wakeup sysfs attributes are created for all devices, regardless of whether or not they are wakeup-capable. This is excessive and complicates wakeup device identification from user space (i.e. to identify wakeup-capable devices user space has to read /sys/devices/.../power/wakeup for all devices and see if they are not empty). Fix this issue by avoiding to create wakeup sysfs files for devices that cannot wake up the system from sleep states (i.e. whose power.can_wakeup flags are unset during registration) and modify device_set_wakeup_capable() so that it adds (or removes) the relevant sysfs attributes if a device's wakeup capability status is changed. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/power.h21
-rw-r--r--drivers/base/power/sysfs.c78
-rw-r--r--drivers/base/power/wakeup.c29
3 files changed, 90 insertions, 38 deletions
diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h
index 698dde742587..f2a25f18fde7 100644
--- a/drivers/base/power/power.h
+++ b/drivers/base/power/power.h
@@ -58,19 +58,18 @@ static inline void device_pm_move_last(struct device *dev) {}
* sysfs.c
*/
-extern int dpm_sysfs_add(struct device *);
-extern void dpm_sysfs_remove(struct device *);
-extern void rpm_sysfs_remove(struct device *);
+extern int dpm_sysfs_add(struct device *dev);
+extern void dpm_sysfs_remove(struct device *dev);
+extern void rpm_sysfs_remove(struct device *dev);
+extern int wakeup_sysfs_add(struct device *dev);
+extern void wakeup_sysfs_remove(struct device *dev);
#else /* CONFIG_PM */
-static inline int dpm_sysfs_add(struct device *dev)
-{
- return 0;
-}
-
-static inline void dpm_sysfs_remove(struct device *dev)
-{
-}
+static inline int dpm_sysfs_add(struct device *dev) { return 0; }
+static inline void dpm_sysfs_remove(struct device *dev) {}
+static inline void rpm_sysfs_remove(struct device *dev) {}
+static inline int wakeup_sysfs_add(struct device *dev) { return 0; }
+static inline void wakeup_sysfs_remove(struct device *dev) {}
#endif
diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
index 0b1e46bf3e56..fff49bee781d 100644
--- a/drivers/base/power/sysfs.c
+++ b/drivers/base/power/sysfs.c
@@ -431,26 +431,18 @@ static ssize_t async_store(struct device *dev, struct device_attribute *attr,
static DEVICE_ATTR(async, 0644, async_show, async_store);
#endif /* CONFIG_PM_ADVANCED_DEBUG */
-static struct attribute * power_attrs[] = {
- &dev_attr_wakeup.attr,
-#ifdef CONFIG_PM_SLEEP
- &dev_attr_wakeup_count.attr,
- &dev_attr_wakeup_active_count.attr,
- &dev_attr_wakeup_hit_count.attr,
- &dev_attr_wakeup_active.attr,
- &dev_attr_wakeup_total_time_ms.attr,
- &dev_attr_wakeup_max_time_ms.attr,
- &dev_attr_wakeup_last_time_ms.attr,
-#endif
+static struct attribute *power_attrs[] = {
#ifdef CONFIG_PM_ADVANCED_DEBUG
+#ifdef CONFIG_PM_SLEEP
&dev_attr_async.attr,
+#endif
#ifdef CONFIG_PM_RUNTIME
&dev_attr_runtime_status.attr,
&dev_attr_runtime_usage.attr,
&dev_attr_runtime_active_kids.attr,
&dev_attr_runtime_enabled.attr,
#endif
-#endif
+#endif /* CONFIG_PM_ADVANCED_DEBUG */
NULL,
};
static struct attribute_group pm_attr_group = {
@@ -458,9 +450,26 @@ static struct attribute_group pm_attr_group = {
.attrs = power_attrs,
};
-#ifdef CONFIG_PM_RUNTIME
+static struct attribute *wakeup_attrs[] = {
+#ifdef CONFIG_PM_SLEEP
+ &dev_attr_wakeup.attr,
+ &dev_attr_wakeup_count.attr,
+ &dev_attr_wakeup_active_count.attr,
+ &dev_attr_wakeup_hit_count.attr,
+ &dev_attr_wakeup_active.attr,
+ &dev_attr_wakeup_total_time_ms.attr,
+ &dev_attr_wakeup_max_time_ms.attr,
+ &dev_attr_wakeup_last_time_ms.attr,
+#endif
+ NULL,
+};
+static struct attribute_group pm_wakeup_attr_group = {
+ .name = power_group_name,
+ .attrs = wakeup_attrs,
+};
static struct attribute *runtime_attrs[] = {
+#ifdef CONFIG_PM_RUNTIME
#ifndef CONFIG_PM_ADVANCED_DEBUG
&dev_attr_runtime_status.attr,
#endif
@@ -468,6 +477,7 @@ static struct attribute *runtime_attrs[] = {
&dev_attr_runtime_suspended_time.attr,
&dev_attr_runtime_active_time.attr,
&dev_attr_autosuspend_delay_ms.attr,
+#endif /* CONFIG_PM_RUNTIME */
NULL,
};
static struct attribute_group pm_runtime_attr_group = {
@@ -480,35 +490,49 @@ int dpm_sysfs_add(struct device *dev)
int rc;
rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
- if (rc == 0 && !dev->power.no_callbacks) {
+ if (rc)
+ return rc;
+
+ if (pm_runtime_callbacks_present(dev)) {
rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
if (rc)
- sysfs_remove_group(&dev->kobj, &pm_attr_group);
+ goto err_out;
+ }
+
+ if (device_can_wakeup(dev)) {
+ rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
+ if (rc) {
+ if (pm_runtime_callbacks_present(dev))
+ sysfs_unmerge_group(&dev->kobj,
+ &pm_runtime_attr_group);
+ goto err_out;
+ }
}
+ return 0;
+
+ err_out:
+ sysfs_remove_group(&dev->kobj, &pm_attr_group);
return rc;
}
-void rpm_sysfs_remove(struct device *dev)
+int wakeup_sysfs_add(struct device *dev)
{
- sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
+ return sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
}
-void dpm_sysfs_remove(struct device *dev)
+void wakeup_sysfs_remove(struct device *dev)
{
- rpm_sysfs_remove(dev);
- sysfs_remove_group(&dev->kobj, &pm_attr_group);
+ sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
}
-#else /* CONFIG_PM_RUNTIME */
-
-int dpm_sysfs_add(struct device * dev)
+void rpm_sysfs_remove(struct device *dev)
{
- return sysfs_create_group(&dev->kobj, &pm_attr_group);
+ sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
}
-void dpm_sysfs_remove(struct device * dev)
+void dpm_sysfs_remove(struct device *dev)
{
+ rpm_sysfs_remove(dev);
+ sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
sysfs_remove_group(&dev->kobj, &pm_attr_group);
}
-
-#endif
diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index 82836383997f..4573c83df6dd 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -242,6 +242,35 @@ int device_wakeup_disable(struct device *dev)
EXPORT_SYMBOL_GPL(device_wakeup_disable);
/**
+ * device_set_wakeup_capable - Set/reset device wakeup capability flag.
+ * @dev: Device to handle.
+ * @capable: Whether or not @dev is capable of waking up the system from sleep.
+ *
+ * If @capable is set, set the @dev's power.can_wakeup flag and add its
+ * wakeup-related attributes to sysfs. Otherwise, unset the @dev's
+ * power.can_wakeup flag and remove its wakeup-related attributes from sysfs.
+ *
+ * This function may sleep and it can't be called from any context where
+ * sleeping is not allowed.
+ */
+void device_set_wakeup_capable(struct device *dev, bool capable)
+{
+ if (!!dev->power.can_wakeup == !!capable)
+ return;
+
+ if (device_is_registered(dev)) {
+ if (capable) {
+ if (wakeup_sysfs_add(dev))
+ return;
+ } else {
+ wakeup_sysfs_remove(dev);
+ }
+ }
+ dev->power.can_wakeup = capable;
+}
+EXPORT_SYMBOL_GPL(device_set_wakeup_capable);
+
+/**
* device_init_wakeup - Device wakeup initialization.
* @dev: Device to handle.
* @enable: Whether or not to enable @dev as a wakeup device.