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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-11-04 16:03:59 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-11-04 23:58:23 +0300
commit8a0662d9ed2968e1186208336a8e1fab3fdfea63 (patch)
tree2109aed71b5279750754f1417e9b0ba0c519caa7 /drivers/acpi/scan.c
parent633a21d80b4a2cd648aa2dacdb22494ffb2f28f0 (diff)
downloadlinux-8a0662d9ed2968e1186208336a8e1fab3fdfea63.tar.xz
Driver core: Unified interface for firmware node properties
Add new generic routines are provided for retrieving properties from device description objects in the platform firmware in case there are no struct device objects for them (either those objects have not been created yet or they do not exist at all). The following functions are provided: fwnode_property_present() fwnode_property_read_u8() fwnode_property_read_u16() fwnode_property_read_u32() fwnode_property_read_u64() fwnode_property_read_string() fwnode_property_read_u8_array() fwnode_property_read_u16_array() fwnode_property_read_u32_array() fwnode_property_read_u64_array() fwnode_property_read_string_array() in analogy with the corresponding functions for struct device added previously. For all of them, the first argument is a pointer to struct fwnode_handle (new type) that allows a device description object (depending on what platform firmware interface is in use) to be obtained. Add a new macro device_for_each_child_node() for iterating over the children of the device description object associated with a given device and a new function device_get_child_node_count() returning the number of a given device's child nodes. The interface covers both ACPI and Device Trees. Suggested-by: Grant Likely <grant.likely@linaro.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Grant Likely <grant.likely@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/scan.c')
-rw-r--r--drivers/acpi/scan.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 3a8f66444532..9cb5cca3cfe3 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1389,6 +1389,26 @@ 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);
+}
+
/* --------------------------------------------------------------------------
Driver Management
-------------------------------------------------------------------------- */
@@ -2008,6 +2028,7 @@ void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
device->device_type = type;
device->handle = handle;
device->parent = acpi_bus_get_parent(handle);
+ device->fwnode.type = FWNODE_ACPI;
acpi_set_device_status(device, sta);
acpi_device_get_busid(device);
acpi_set_pnp_ids(handle, &device->pnp, type);