ACPI / PM: Expose current status of ACPI power resources (b1c0f99b) · Commits · 戴 / test

Documentation/ABI/testing/sysfs-devices-resource_in_use

0 → 100644

+12 −0

Original line number	Diff line number	Diff line
		What: /sys/devices/.../resource_in_use
		Date: January 2013
		Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
		Description:
		The /sys/devices/.../resource_in_use attribute is only present
		for device objects representing ACPI power resources.

		If present, it contains a number (0 or 1) representing the
		current status of the given power resource (0 means that the
		resource is not in use and therefore it has been turned off).

		This attribute is read-only.

drivers/acpi/power.c

+25 −1

Original line number	Diff line number	Diff line
		@@ -87,6 +87,12 @@ static DEFINE_MUTEX(power_resource_list_lock);
		Power Resource Management
		-------------------------------------------------------------------------- */

		static inline
		struct acpi_power_resource to_power_resource(struct acpi_device device)
		{
		return container_of(device, struct acpi_power_resource, device);
		}

		static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle)
		{
		struct acpi_device *device;
		@@ -94,7 +100,7 @@ static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle)
		if (acpi_bus_get_device(handle, &device))
		return NULL;

		return container_of(device, struct acpi_power_resource, device);
		return to_power_resource(device);
		}

		static int acpi_power_resources_list_add(acpi_handle handle,
		@@ -678,6 +684,21 @@ static void acpi_release_power_resource(struct device *dev)
		kfree(resource);
		}

		static ssize_t acpi_power_in_use_show(struct device *dev,
		struct device_attribute *attr,
		char *buf) {
		struct acpi_power_resource *resource;

		resource = to_power_resource(to_acpi_device(dev));
		return sprintf(buf, "%u\n", !!resource->ref_count);
		}
		static DEVICE_ATTR(resource_in_use, 0444, acpi_power_in_use_show, NULL);

		static void acpi_power_sysfs_remove(struct acpi_device *device)
		{
		device_remove_file(&device->dev, &dev_attr_resource_in_use);
		}

		int acpi_add_power_resource(acpi_handle handle)
		{
		struct acpi_power_resource *resource;
		@@ -725,6 +746,9 @@ int acpi_add_power_resource(acpi_handle handle)
		if (result)
		goto err;

		if (!device_create_file(&device->dev, &dev_attr_resource_in_use))
		device->remove = acpi_power_sysfs_remove;

		mutex_lock(&power_resource_list_lock);
		list_add(&resource->list_node, &acpi_power_resource_list);
		mutex_unlock(&power_resource_list_lock);

drivers/acpi/scan.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -791,6 +791,9 @@ static void acpi_device_unregister(struct acpi_device *device)

		acpi_power_add_remove_device(device, false);
		acpi_device_remove_files(device);
		if (device->remove)
		device->remove(device);

		device_del(&device->dev);
		/*
		* Drop the reference counts of all power resources the device depends

include/acpi/acpi_bus.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -280,6 +280,7 @@ struct acpi_device {
		struct mutex physical_node_lock;
		DECLARE_BITMAP(physical_node_id_bitmap, ACPI_MAX_PHYSICAL_NODE);
		struct list_head power_dependent;
		void (remove)(struct acpi_device );
		};

		static inline void acpi_driver_data(struct acpi_device d)

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