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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-04-11 22:41:48 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-04-11 22:41:48 +0200
commit41a2a4665d401f79912a3da83ff9ef3e502bc12e (patch)
treec1183d82f60df38205921e293a022d47d90268b2
parent75eb2d13acca49c3c4f1c96fb04d6c9fd6013e78 (diff)
downloadlinux-41a2a4665d401f79912a3da83ff9ef3e502bc12e.tar.bz2
ACPI / PM: Expose lists of device wakeup power resources to user space
Commit 18a3870 (ACPI / PM: Expose lists of device power resources to user space) exposed the lists of ACPI power resources associated with power states of ACPI devices, but it didn't expose the lists of ACPI wakeup power resources, which also is necessary to get the full picture of dependencies between ACPI devices and power resources. For this reason, for every ACPI device node having a list of ACPI wakeup power resources associated with it, expose that list to user space in analogy with commit 18a3870. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--Documentation/ABI/testing/sysfs-devices-power_resources_wakeup13
-rw-r--r--drivers/acpi/power.c58
2 files changed, 52 insertions, 19 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-power_resources_wakeup b/Documentation/ABI/testing/sysfs-devices-power_resources_wakeup
new file mode 100644
index 000000000000..e0588feeb6e1
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-devices-power_resources_wakeup
@@ -0,0 +1,13 @@
+What: /sys/devices/.../power_resources_wakeup/
+Date: April 2013
+Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+Description:
+ The /sys/devices/.../power_resources_wakeup/ directory is only
+ present for device objects representing ACPI device nodes that
+ require ACPI power resources for wakeup signaling.
+
+ If present, it contains symbolic links to device directories
+ representing ACPI power resources that need to be turned on for
+ the given device node to be able to signal wakeup. The names of
+ the links are the same as the names of the directories they
+ point to.
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 34f5ef11d427..0e3f57674fd1 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -459,57 +459,79 @@ static struct attribute_group attr_groups[] = {
},
};
-static void acpi_power_hide_list(struct acpi_device *adev, int state)
+static struct attribute_group wakeup_attr_group = {
+ .name = "power_resources_wakeup",
+ .attrs = attrs,
+};
+
+static void acpi_power_hide_list(struct acpi_device *adev,
+ struct list_head *resources,
+ struct attribute_group *attr_group)
{
- struct acpi_device_power_state *ps = &adev->power.states[state];
struct acpi_power_resource_entry *entry;
- if (list_empty(&ps->resources))
+ if (list_empty(resources))
return;
- list_for_each_entry_reverse(entry, &ps->resources, node) {
+ list_for_each_entry_reverse(entry, resources, node) {
struct acpi_device *res_dev = &entry->resource->device;
sysfs_remove_link_from_group(&adev->dev.kobj,
- attr_groups[state].name,
+ attr_group->name,
dev_name(&res_dev->dev));
}
- sysfs_remove_group(&adev->dev.kobj, &attr_groups[state]);
+ sysfs_remove_group(&adev->dev.kobj, attr_group);
}
-static void acpi_power_expose_list(struct acpi_device *adev, int state)
+static void acpi_power_expose_list(struct acpi_device *adev,
+ struct list_head *resources,
+ struct attribute_group *attr_group)
{
- struct acpi_device_power_state *ps = &adev->power.states[state];
struct acpi_power_resource_entry *entry;
int ret;
- if (list_empty(&ps->resources))
+ if (list_empty(resources))
return;
- ret = sysfs_create_group(&adev->dev.kobj, &attr_groups[state]);
+ ret = sysfs_create_group(&adev->dev.kobj, attr_group);
if (ret)
return;
- list_for_each_entry(entry, &ps->resources, node) {
+ list_for_each_entry(entry, resources, node) {
struct acpi_device *res_dev = &entry->resource->device;
ret = sysfs_add_link_to_group(&adev->dev.kobj,
- attr_groups[state].name,
+ attr_group->name,
&res_dev->dev.kobj,
dev_name(&res_dev->dev));
if (ret) {
- acpi_power_hide_list(adev, state);
+ acpi_power_hide_list(adev, resources, attr_group);
break;
}
}
}
+static void acpi_power_expose_hide(struct acpi_device *adev,
+ struct list_head *resources,
+ struct attribute_group *attr_group,
+ bool expose)
+{
+ if (expose)
+ acpi_power_expose_list(adev, resources, attr_group);
+ else
+ acpi_power_hide_list(adev, resources, attr_group);
+}
+
void acpi_power_add_remove_device(struct acpi_device *adev, bool add)
{
struct acpi_device_power_state *ps;
struct acpi_power_resource_entry *entry;
int state;
+ if (adev->wakeup.flags.valid)
+ acpi_power_expose_hide(adev, &adev->wakeup.resources,
+ &wakeup_attr_group, add);
+
if (!adev->power.flags.power_resources)
return;
@@ -523,12 +545,10 @@ void acpi_power_add_remove_device(struct acpi_device *adev, bool add)
acpi_power_remove_dependent(resource, adev);
}
- for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++) {
- if (add)
- acpi_power_expose_list(adev, state);
- else
- acpi_power_hide_list(adev, state);
- }
+ for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++)
+ acpi_power_expose_hide(adev,
+ &adev->power.states[state].resources,
+ &attr_groups[state], add);
}
int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p)