Merge branch 'device-properties' into acpi-init (23378249) · Commits · EulixOS / Software / Kernel

drivers/acpi/device_sysfs.c

+108 −12

Original line number	Diff line number	Diff line
		@@ -26,6 +26,106 @@

		#include "internal.h"

		static ssize_t acpi_object_path(acpi_handle handle, char *buf)
		{
		struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
		int result;

		result = acpi_get_name(handle, ACPI_FULL_PATHNAME, &path);
		if (result)
		return result;

		result = sprintf(buf, "%s\n", (char*)path.pointer);
		kfree(path.pointer);
		return result;
		}

		struct acpi_data_node_attr {
		struct attribute attr;
		ssize_t (show)(struct acpi_data_node , char *);
		ssize_t (store)(struct acpi_data_node , const char *, size_t count);
		};

		#define DATA_NODE_ATTR(_name) \
		static struct acpi_data_node_attr data_node_##_name = \
		__ATTR(_name, 0444, data_node_show_##_name, NULL)

		static ssize_t data_node_show_path(struct acpi_data_node dn, char buf)
		{
		return acpi_object_path(dn->handle, buf);
		}

		DATA_NODE_ATTR(path);

		static struct attribute *acpi_data_node_default_attrs[] = {
		&data_node_path.attr,
		NULL
		};

		#define to_data_node(k) container_of(k, struct acpi_data_node, kobj)
		#define to_attr(a) container_of(a, struct acpi_data_node_attr, attr)

		static ssize_t acpi_data_node_attr_show(struct kobject *kobj,
		struct attribute attr, char buf)
		{
		struct acpi_data_node *dn = to_data_node(kobj);
		struct acpi_data_node_attr *dn_attr = to_attr(attr);

		return dn_attr->show ? dn_attr->show(dn, buf) : -ENXIO;
		}

		static const struct sysfs_ops acpi_data_node_sysfs_ops = {
		.show = acpi_data_node_attr_show,
		};

		static void acpi_data_node_release(struct kobject *kobj)
		{
		struct acpi_data_node *dn = to_data_node(kobj);
		complete(&dn->kobj_done);
		}

		static struct kobj_type acpi_data_node_ktype = {
		.sysfs_ops = &acpi_data_node_sysfs_ops,
		.default_attrs = acpi_data_node_default_attrs,
		.release = acpi_data_node_release,
		};

		static void acpi_expose_nondev_subnodes(struct kobject *kobj,
		struct acpi_device_data *data)
		{
		struct list_head *list = &data->subnodes;
		struct acpi_data_node *dn;

		if (list_empty(list))
		return;

		list_for_each_entry(dn, list, sibling) {
		int ret;

		init_completion(&dn->kobj_done);
		ret = kobject_init_and_add(&dn->kobj, &acpi_data_node_ktype,
		kobj, dn->name);
		if (ret)
		acpi_handle_err(dn->handle, "Failed to expose (%d)\n", ret);
		else
		acpi_expose_nondev_subnodes(&dn->kobj, &dn->data);
		}
		}

		static void acpi_hide_nondev_subnodes(struct acpi_device_data *data)
		{
		struct list_head *list = &data->subnodes;
		struct acpi_data_node *dn;

		if (list_empty(list))
		return;

		list_for_each_entry_reverse(dn, list, sibling) {
		acpi_hide_nondev_subnodes(&dn->data);
		kobject_put(&dn->kobj);
		}
		}

		/**
		* create_pnp_modalias - Create hid/cid(s) string for modalias and uevent
		* @acpi_dev: ACPI device object.
		@@ -323,20 +423,12 @@ static ssize_t acpi_device_adr_show(struct device *dev,
		}
		static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);

		static ssize_t
		acpi_device_path_show(struct device dev, struct device_attribute attr, char *buf) {
		static ssize_t acpi_device_path_show(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct acpi_device *acpi_dev = to_acpi_device(dev);
		struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
		int result;

		result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
		if (result)
		goto end;

		result = sprintf(buf, "%s\n", (char*)path.pointer);
		kfree(path.pointer);
		end:
		return result;
		return acpi_object_path(acpi_dev->handle, buf);
		}
		static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);

		@@ -475,6 +567,8 @@ int acpi_device_setup_files(struct acpi_device *dev)
		&dev_attr_real_power_state);
		}

		acpi_expose_nondev_subnodes(&dev->dev.kobj, &dev->data);

		end:
		return result;
		}
		@@ -485,6 +579,8 @@ int acpi_device_setup_files(struct acpi_device *dev)
		*/
		void acpi_device_remove_files(struct acpi_device *dev)
		{
		acpi_hide_nondev_subnodes(&dev->data);

		if (dev->flags.power_manageable) {
		device_remove_file(&dev->dev, &dev_attr_power_state);
		if (dev->power.flags.power_resources)

drivers/acpi/property.c

+351 −69

Original line number	Diff line number	Diff line
		@@ -19,11 +19,126 @@

		#include "internal.h"

		static int acpi_data_get_property_array(struct acpi_device_data *data,
		const char *name,
		acpi_object_type type,
		const union acpi_object **obj);

		/* ACPI _DSD device properties UUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301 */
		static const u8 prp_uuid[16] = {
		0x14, 0xd8, 0xff, 0xda, 0xba, 0x6e, 0x8c, 0x4d,
		0x8a, 0x91, 0xbc, 0x9b, 0xbf, 0x4a, 0xa3, 0x01
		};
		/* ACPI _DSD data subnodes UUID: dbb8e3e6-5886-4ba6-8795-1319f52a966b */
		static const u8 ads_uuid[16] = {
		0xe6, 0xe3, 0xb8, 0xdb, 0x86, 0x58, 0xa6, 0x4b,
		0x87, 0x95, 0x13, 0x19, 0xf5, 0x2a, 0x96, 0x6b
		};

		static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
		const union acpi_object *desc,
		struct acpi_device_data *data);
		static bool acpi_extract_properties(const union acpi_object *desc,
		struct acpi_device_data *data);

		static bool acpi_nondev_subnode_ok(acpi_handle scope,
		const union acpi_object *link,
		struct list_head *list)
		{
		struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
		struct acpi_data_node *dn;
		acpi_handle handle;
		acpi_status status;

		dn = kzalloc(sizeof(*dn), GFP_KERNEL);
		if (!dn)
		return false;

		dn->name = link->package.elements[0].string.pointer;
		dn->fwnode.type = FWNODE_ACPI_DATA;
		INIT_LIST_HEAD(&dn->data.subnodes);

		status = acpi_get_handle(scope, link->package.elements[1].string.pointer,
		&handle);
		if (ACPI_FAILURE(status))
		goto fail;

		status = acpi_evaluate_object_typed(handle, NULL, NULL, &buf,
		ACPI_TYPE_PACKAGE);
		if (ACPI_FAILURE(status))
		goto fail;

		if (acpi_extract_properties(buf.pointer, &dn->data))
		dn->handle = handle;

		if (acpi_enumerate_nondev_subnodes(scope, buf.pointer, &dn->data))
		dn->handle = handle;

		if (dn->handle) {
		dn->data.pointer = buf.pointer;
		list_add_tail(&dn->sibling, list);
		return true;
		}

		acpi_handle_debug(handle, "Invalid properties/subnodes data, skipping\n");

		fail:
		ACPI_FREE(buf.pointer);
		kfree(dn);
		return false;
		}

		static int acpi_add_nondev_subnodes(acpi_handle scope,
		const union acpi_object *links,
		struct list_head *list)
		{
		bool ret = false;
		int i;

		for (i = 0; i < links->package.count; i++) {
		const union acpi_object *link;

		link = &links->package.elements[i];
		/* Only two elements allowed, both must be strings. */
		if (link->package.count == 2
		&& link->package.elements[0].type == ACPI_TYPE_STRING
		&& link->package.elements[1].type == ACPI_TYPE_STRING
		&& acpi_nondev_subnode_ok(scope, link, list))
		ret = true;
		}

		return ret;
		}

		static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
		const union acpi_object *desc,
		struct acpi_device_data *data)
		{
		int i;

		/* Look for the ACPI data subnodes UUID. */
		for (i = 0; i < desc->package.count; i += 2) {
		const union acpi_object uuid, links;

		uuid = &desc->package.elements[i];
		links = &desc->package.elements[i + 1];

		/*
		* The first element must be a UUID and the second one must be
		* a package.
		*/
		if (uuid->type != ACPI_TYPE_BUFFER \|\| uuid->buffer.length != 16
		\|\| links->type != ACPI_TYPE_PACKAGE)
		break;

		if (memcmp(uuid->buffer.pointer, ads_uuid, sizeof(ads_uuid)))
		continue;

		return acpi_add_nondev_subnodes(scope, links, &data->subnodes);
		}

		return false;
		}

		static bool acpi_property_value_ok(const union acpi_object *value)
		{
		@@ -81,8 +196,8 @@ static void acpi_init_of_compatible(struct acpi_device *adev)
		const union acpi_object *of_compatible;
		int ret;

		ret = acpi_dev_get_property_array(adev, "compatible", ACPI_TYPE_STRING,
		&of_compatible);
		ret = acpi_data_get_property_array(&adev->data, "compatible",
		ACPI_TYPE_STRING, &of_compatible);
		if (ret) {
		ret = acpi_dev_get_property(adev, "compatible",
		ACPI_TYPE_STRING, &of_compatible);
		@@ -100,34 +215,13 @@ static void acpi_init_of_compatible(struct acpi_device *adev)
		adev->flags.of_compatible_ok = 1;
		}

		void acpi_init_properties(struct acpi_device *adev)
		static bool acpi_extract_properties(const union acpi_object *desc,
		struct acpi_device_data *data)
		{
		struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
		bool acpi_of = false;
		struct acpi_hardware_id *hwid;
		const union acpi_object *desc;
		acpi_status status;
		int i;

		/*
		* Check if ACPI_DT_NAMESPACE_HID is present and inthat case we fill in
		* Device Tree compatible properties for this device.
		*/
		list_for_each_entry(hwid, &adev->pnp.ids, list) {
		if (!strcmp(hwid->id, ACPI_DT_NAMESPACE_HID)) {
		acpi_of = true;
		break;
		}
		}

		status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL, &buf,
		ACPI_TYPE_PACKAGE);
		if (ACPI_FAILURE(status))
		goto out;

		desc = buf.pointer;
		if (desc->package.count % 2)
		goto fail;
		return false;

		/* Look for the device properties UUID. */
		for (i = 0; i < desc->package.count; i += 2) {
		@@ -154,18 +248,50 @@ void acpi_init_properties(struct acpi_device *adev)
		if (!acpi_properties_format_valid(properties))
		break;

		adev->data.pointer = buf.pointer;
		adev->data.properties = properties;
		data->properties = properties;
		return true;
		}

		if (acpi_of)
		acpi_init_of_compatible(adev);
		return false;
		}

		void acpi_init_properties(struct acpi_device *adev)
		{
		struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
		struct acpi_hardware_id *hwid;
		acpi_status status;
		bool acpi_of = false;

		INIT_LIST_HEAD(&adev->data.subnodes);

		/*
		* Check if ACPI_DT_NAMESPACE_HID is present and inthat case we fill in
		* Device Tree compatible properties for this device.
		*/
		list_for_each_entry(hwid, &adev->pnp.ids, list) {
		if (!strcmp(hwid->id, ACPI_DT_NAMESPACE_HID)) {
		acpi_of = true;
		break;
		}
		}

		status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL, &buf,
		ACPI_TYPE_PACKAGE);
		if (ACPI_FAILURE(status))
		goto out;

		if (acpi_extract_properties(buf.pointer, &adev->data)) {
		adev->data.pointer = buf.pointer;
		if (acpi_of)
		acpi_init_of_compatible(adev);
		}
		if (acpi_enumerate_nondev_subnodes(adev->handle, buf.pointer, &adev->data))
		adev->data.pointer = buf.pointer;

		fail:
		dev_dbg(&adev->dev, "Returned _DSD data is not valid, skipping\n");
		if (!adev->data.pointer) {
		acpi_handle_debug(adev->handle, "Invalid _DSD data, skipping\n");
		ACPI_FREE(buf.pointer);
		}

		out:
		if (acpi_of && !adev->flags.of_compatible_ok)
		@@ -173,8 +299,25 @@ void acpi_init_properties(struct acpi_device *adev)
		ACPI_DT_NAMESPACE_HID " requires 'compatible' property\n");
		}

		static void acpi_destroy_nondev_subnodes(struct list_head *list)
		{
		struct acpi_data_node dn, next;

		if (list_empty(list))
		return;

		list_for_each_entry_safe_reverse(dn, next, list, sibling) {
		acpi_destroy_nondev_subnodes(&dn->data.subnodes);
		wait_for_completion(&dn->kobj_done);
		list_del(&dn->sibling);
		ACPI_FREE((void *)dn->data.pointer);
		kfree(dn);
		}
		}

		void acpi_free_properties(struct acpi_device *adev)
		{
		acpi_destroy_nondev_subnodes(&adev->data.subnodes);
		ACPI_FREE((void *)adev->data.pointer);
		adev->data.of_compatible = NULL;
		adev->data.pointer = NULL;
		@@ -182,8 +325,8 @@ void acpi_free_properties(struct acpi_device *adev)
		}

		/**
		* acpi_dev_get_property - return an ACPI property with given name
		* @adev: ACPI device to get property
		* acpi_data_get_property - return an ACPI property with given name
		* @data: ACPI device deta object to get the property from
		* @name: Name of the property
		* @type: Expected property type
		* @obj: Location to store the property value (if not %NULL)
		@@ -192,26 +335,27 @@ void acpi_free_properties(struct acpi_device *adev)
		* object at the location pointed to by @obj if found.
		*
		* Callers must not attempt to free the returned objects. These objects will be
		* freed by the ACPI core automatically during the removal of @adev.
		* freed by the ACPI core automatically during the removal of @data.
		*
		* Return: %0 if property with @name has been found (success),
		* %-EINVAL if the arguments are invalid,
		* %-ENODATA if the property doesn't exist,
		* %-EPROTO if the property value type doesn't match @type.
		*/
		int acpi_dev_get_property(struct acpi_device adev, const char name,
		acpi_object_type type, const union acpi_object **obj)
		static int acpi_data_get_property(struct acpi_device_data *data,
		const char *name, acpi_object_type type,
		const union acpi_object **obj)
		{
		const union acpi_object *properties;
		int i;

		if (!adev \|\| !name)
		if (!data \|\| !name)
		return -EINVAL;

		if (!adev->data.pointer \|\| !adev->data.properties)
		if (!data->pointer \|\| !data->properties)
		return -ENODATA;

		properties = adev->data.properties;
		properties = data->properties;
		for (i = 0; i < properties->package.count; i++) {
		const union acpi_object propname, propvalue;
		const union acpi_object *property;
		@@ -232,11 +376,50 @@ int acpi_dev_get_property(struct acpi_device adev, const char name,
		}
		return -ENODATA;
		}

		/**
		* acpi_dev_get_property - return an ACPI property with given name.
		* @adev: ACPI device to get the property from.
		* @name: Name of the property.
		* @type: Expected property type.
		* @obj: Location to store the property value (if not %NULL).
		*/
		int acpi_dev_get_property(struct acpi_device adev, const char name,
		acpi_object_type type, const union acpi_object **obj)
		{
		return adev ? acpi_data_get_property(&adev->data, name, type, obj) : -EINVAL;
		}
		EXPORT_SYMBOL_GPL(acpi_dev_get_property);

		static struct acpi_device_data acpi_device_data_of_node(struct fwnode_handle fwnode)
		{
		if (fwnode->type == FWNODE_ACPI) {
		struct acpi_device *adev = to_acpi_device_node(fwnode);
		return &adev->data;
		} else if (fwnode->type == FWNODE_ACPI_DATA) {
		struct acpi_data_node *dn = to_acpi_data_node(fwnode);
		return &dn->data;
		}
		return NULL;
		}

		/**
		* acpi_node_prop_get - return an ACPI property with given name.
		* @fwnode: Firmware node to get the property from.
		* @propname: Name of the property.
		* @valptr: Location to store a pointer to the property value (if not %NULL).
		*/
		int acpi_node_prop_get(struct fwnode_handle fwnode, const char propname,
		void **valptr)
		{
		return acpi_data_get_property(acpi_device_data_of_node(fwnode),
		propname, ACPI_TYPE_ANY,
		(const union acpi_object **)valptr);
		}

		/**
		* acpi_dev_get_property_array - return an ACPI array property with given name
		* @adev: ACPI device to get property
		* acpi_data_get_property_array - return an ACPI array property with given name
		* @adev: ACPI data object to get the property from
		* @name: Name of the property
		* @type: Expected type of array elements
		* @obj: Location to store a pointer to the property value (if not NULL)
		@@ -245,7 +428,7 @@ EXPORT_SYMBOL_GPL(acpi_dev_get_property);
		* ACPI object at the location pointed to by @obj if found.
		*
		* Callers must not attempt to free the returned objects. Those objects will be
		* freed by the ACPI core automatically during the removal of @adev.
		* freed by the ACPI core automatically during the removal of @data.
		*
		* Return: %0 if array property (package) with @name has been found (success),
		* %-EINVAL if the arguments are invalid,
		@@ -253,14 +436,15 @@ EXPORT_SYMBOL_GPL(acpi_dev_get_property);
		* %-EPROTO if the property is not a package or the type of its elements
		* doesn't match @type.
		*/
		int acpi_dev_get_property_array(struct acpi_device adev, const char name,
		static int acpi_data_get_property_array(struct acpi_device_data *data,
		const char *name,
		acpi_object_type type,
		const union acpi_object **obj)
		{
		const union acpi_object *prop;
		int ret, i;

		ret = acpi_dev_get_property(adev, name, ACPI_TYPE_PACKAGE, &prop);
		ret = acpi_data_get_property(data, name, ACPI_TYPE_PACKAGE, &prop);
		if (ret)
		return ret;

		@@ -275,12 +459,11 @@ int acpi_dev_get_property_array(struct acpi_device adev, const char name,

		return 0;
		}
		EXPORT_SYMBOL_GPL(acpi_dev_get_property_array);

		/**
		* acpi_dev_get_property_reference - returns handle to the referenced object
		* @adev: ACPI device to get property
		* @name: Name of the property
		* acpi_data_get_property_reference - returns handle to the referenced object
		* @data: ACPI device data object containing the property
		* @propname: Name of the property
		* @index: Index of the reference to return
		* @args: Location to store the returned reference with optional arguments
		*
		@@ -294,8 +477,8 @@ EXPORT_SYMBOL_GPL(acpi_dev_get_property_array);
		*
		* Return: %0 on success, negative error code on failure.
		*/
		int acpi_dev_get_property_reference(struct acpi_device *adev,
		const char *name, size_t index,
		static int acpi_data_get_property_reference(struct acpi_device_data *data,
		const char *propname, size_t index,
		struct acpi_reference_args *args)
		{
		const union acpi_object element, end;
		@@ -303,7 +486,7 @@ int acpi_dev_get_property_reference(struct acpi_device *adev,
		struct acpi_device *device;
		int ret, idx = 0;

		ret = acpi_dev_get_property(adev, name, ACPI_TYPE_ANY, &obj);
		ret = acpi_data_get_property(data, propname, ACPI_TYPE_ANY, &obj);
		if (ret)
		return ret;

		@@ -378,16 +561,26 @@ int acpi_dev_get_property_reference(struct acpi_device *adev,

		return -EPROTO;
		}
		EXPORT_SYMBOL_GPL(acpi_dev_get_property_reference);

		int acpi_dev_prop_get(struct acpi_device adev, const char propname,
		void **valptr)
		/**
		* acpi_node_get_property_reference - get a handle to the referenced object.
		* @fwnode: Firmware node to get the property from.
		* @propname: Name of the property.
		* @index: Index of the reference to return.
		* @args: Location to store the returned reference with optional arguments.
		*/
		int acpi_node_get_property_reference(struct fwnode_handle *fwnode,
		const char *name, size_t index,
		struct acpi_reference_args *args)
		{
		return acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
		(const union acpi_object **)valptr);
		struct acpi_device_data *data = acpi_device_data_of_node(fwnode);

		return data ? acpi_data_get_property_reference(data, name, index, args) : -EINVAL;
		}
		EXPORT_SYMBOL_GPL(acpi_node_get_property_reference);

		int acpi_dev_prop_read_single(struct acpi_device adev, const char propname,
		static int acpi_data_prop_read_single(struct acpi_device_data *data,
		const char *propname,
		enum dev_prop_type proptype, void *val)
		{
		const union acpi_object *obj;
		@@ -397,7 +590,7 @@ int acpi_dev_prop_read_single(struct acpi_device adev, const char propname,
		return -EINVAL;

		if (proptype >= DEV_PROP_U8 && proptype <= DEV_PROP_U64) {
		ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_INTEGER, &obj);
		ret = acpi_data_get_property(data, propname, ACPI_TYPE_INTEGER, &obj);
		if (ret)
		return ret;

		@@ -422,7 +615,7 @@ int acpi_dev_prop_read_single(struct acpi_device adev, const char propname,
		break;
		}
		} else if (proptype == DEV_PROP_STRING) {
		ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_STRING, &obj);
		ret = acpi_data_get_property(data, propname, ACPI_TYPE_STRING, &obj);
		if (ret)
		return ret;

		@@ -433,6 +626,12 @@ int acpi_dev_prop_read_single(struct acpi_device adev, const char propname,
		return ret;
		}

		int acpi_dev_prop_read_single(struct acpi_device adev, const char propname,
		enum dev_prop_type proptype, void *val)
		{
		return adev ? acpi_data_prop_read_single(&adev->data, propname, proptype, val) : -EINVAL;
		}

		static int acpi_copy_property_array_u8(const union acpi_object items, u8 val,
		size_t nval)
		{
		@@ -509,20 +708,22 @@ static int acpi_copy_property_array_string(const union acpi_object *items,
		return 0;
		}

		int acpi_dev_prop_read(struct acpi_device adev, const char propname,
		enum dev_prop_type proptype, void *val, size_t nval)
		static int acpi_data_prop_read(struct acpi_device_data *data,
		const char *propname,
		enum dev_prop_type proptype,
		void *val, size_t nval)
		{
		const union acpi_object *obj;
		const union acpi_object *items;
		int ret;

		if (val && nval == 1) {
		ret = acpi_dev_prop_read_single(adev, propname, proptype, val);
		ret = acpi_data_prop_read_single(data, propname, proptype, val);
		if (!ret)
		return ret;
		}

		ret = acpi_dev_get_property_array(adev, propname, ACPI_TYPE_ANY, &obj);
		ret = acpi_data_get_property_array(data, propname, ACPI_TYPE_ANY, &obj);
		if (ret)
		return ret;

		@@ -558,3 +759,84 @@ int acpi_dev_prop_read(struct acpi_device adev, const char propname,
		}
		return ret;
		}

		int acpi_dev_prop_read(struct acpi_device adev, const char propname,
		enum dev_prop_type proptype, void *val, size_t nval)
		{
		return adev ? acpi_data_prop_read(&adev->data, propname, proptype, val, nval) : -EINVAL;
		}

		/**
		* acpi_node_prop_read - retrieve the value of an ACPI property with given name.
		* @fwnode: Firmware node to get the property from.
		* @propname: Name of the property.
		* @proptype: Expected property type.
		* @val: Location to store the property value (if not %NULL).
		* @nval: Size of the array pointed to by @val.
		*
		* If @val is %NULL, return the number of array elements comprising the value
		* of the property. Otherwise, read at most @nval values to the array at the
		* location pointed to by @val.
		*/
		int acpi_node_prop_read(struct fwnode_handle fwnode, const char propname,
		enum dev_prop_type proptype, void *val, size_t nval)
		{
		return acpi_data_prop_read(acpi_device_data_of_node(fwnode),
		propname, proptype, val, nval);
		}

		/**
		* acpi_get_next_subnode - Return the next child node handle for a device.
		* @dev: Device to find the next child node for.
		* @child: Handle to one of the device's child nodes or a null handle.
		*/
		struct fwnode_handle acpi_get_next_subnode(struct device dev,
		struct fwnode_handle *child)
		{
		struct acpi_device *adev = ACPI_COMPANION(dev);
		struct list_head head, next;

		if (!adev)
		return NULL;

		if (!child \|\| child->type == FWNODE_ACPI) {
		head = &adev->children;
		if (list_empty(head))
		goto nondev;

		if (child) {
		adev = to_acpi_device_node(child);
		next = adev->node.next;
		if (next == head) {
		child = NULL;
		goto nondev;
		}
		adev = list_entry(next, struct acpi_device, node);
		} else {
		adev = list_first_entry(head, struct acpi_device, node);
		}
		return acpi_fwnode_handle(adev);
		}

		nondev:
		if (!child \|\| child->type == FWNODE_ACPI_DATA) {
		struct acpi_data_node *dn;

		head = &adev->data.subnodes;
		if (list_empty(head))
		return NULL;

		if (child) {
		dn = to_acpi_data_node(child);
		next = dn->sibling.next;
		if (next == head)
		return NULL;

		dn = list_entry(next, struct acpi_data_node, sibling);
		} else {
		dn = list_first_entry(head, struct acpi_data_node, sibling);
		}
		return &dn->fwnode;
		}
		return NULL;
		}

drivers/acpi/scan.c

+0 −20

Original line number	Diff line number	Diff line
		@@ -695,26 +695,6 @@ int acpi_device_add(struct acpi_device *device,
		return result;
		}

		struct acpi_device acpi_get_next_child(struct device dev,
		struct acpi_device *child)
		{
		struct acpi_device *adev = ACPI_COMPANION(dev);
		struct list_head head, next;

		if (!adev)
		return NULL;

		head = &adev->children;
		if (list_empty(head))
		return NULL;

		if (!child)
		return list_first_entry(head, struct acpi_device, node);

		next = child->node.next;
		return next == head ? NULL : list_entry(next, struct acpi_device, node);
		}

		/* --------------------------------------------------------------------------
		Device Enumeration
		-------------------------------------------------------------------------- */

drivers/base/property.c

+76 −12

File changed.

Preview size limit exceeded, changes collapsed.

drivers/dma/acpi-dma.c

+17 −8

Original line number	Diff line number	Diff line
		@@ -21,6 +21,7 @@
		#include <linux/ioport.h>
		#include <linux/acpi.h>
		#include <linux/acpi_dma.h>
		#include <linux/property.h>

		static LIST_HEAD(acpi_dma_list);
		static DEFINE_MUTEX(acpi_dma_lock);
		@@ -413,21 +414,29 @@ EXPORT_SYMBOL_GPL(acpi_dma_request_slave_chan_by_index);
		* translate the names "tx" and "rx" here based on the most common case where
		* the first FixedDMA descriptor is TX and second is RX.
		*
		* If the device has "dma-names" property the FixedDMA descriptor indices
		* are retrieved based on those. Otherwise the function falls back using
		* hardcoded indices.
		*
		* Return:
		* Pointer to appropriate dma channel on success or an error pointer.
		*/
		struct dma_chan acpi_dma_request_slave_chan_by_name(struct device dev,
		const char *name)
		{
		size_t index;
		int index;

		index = device_property_match_string(dev, "dma-names", name);
		if (index < 0) {
		if (!strcmp(name, "tx"))
		index = 0;
		else if (!strcmp(name, "rx"))
		index = 1;
		else
		return ERR_PTR(-ENODEV);
		}

		dev_dbg(dev, "found DMA channel \"%s\" at index %d\n", name, index);
		return acpi_dma_request_slave_chan_by_index(dev, index);
		}
		EXPORT_SYMBOL_GPL(acpi_dma_request_slave_chan_by_name);