ACPI: Provide generic functions for matching ACPI device nodes
Introduce function acpi_match_device() allowing callers to match
struct device objects with populated acpi_handle fields against
arrays of ACPI device IDs. Also introduce function
acpi_driver_match_device() using acpi_match_device() internally and
allowing callers to match a struct device object against an array of
ACPI device IDs provided by a device driver.
Additionally, introduce macro ACPI_PTR() that may be used by device
drivers to escape pointers to data structures whose definitions
depend on CONFIG_ACPI.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Acked-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 1fcb867..a0dfdff 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -340,8 +340,8 @@
ACPI Bus operations
-------------------------------------------------------------------------- */
-int acpi_match_device_ids(struct acpi_device *device,
- const struct acpi_device_id *ids)
+static const struct acpi_device_id *__acpi_match_device(
+ struct acpi_device *device, const struct acpi_device_id *ids)
{
const struct acpi_device_id *id;
struct acpi_hardware_id *hwid;
@@ -351,14 +351,44 @@
* driver for it.
*/
if (!device->status.present)
- return -ENODEV;
+ return NULL;
for (id = ids; id->id[0]; id++)
list_for_each_entry(hwid, &device->pnp.ids, list)
if (!strcmp((char *) id->id, hwid->id))
- return 0;
+ return id;
- return -ENOENT;
+ return NULL;
+}
+
+/**
+ * acpi_match_device - Match a struct device against a given list of ACPI IDs
+ * @ids: Array of struct acpi_device_id object to match against.
+ * @dev: The device structure to match.
+ *
+ * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
+ * object for that handle and use that object to match against a given list of
+ * device IDs.
+ *
+ * Return a pointer to the first matching ID on success or %NULL on failure.
+ */
+const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
+ const struct device *dev)
+{
+ struct acpi_device *adev;
+
+ if (!ids || !dev->acpi_handle
+ || ACPI_FAILURE(acpi_bus_get_device(dev->acpi_handle, &adev)))
+ return NULL;
+
+ return __acpi_match_device(adev, ids);
+}
+EXPORT_SYMBOL_GPL(acpi_match_device);
+
+int acpi_match_device_ids(struct acpi_device *device,
+ const struct acpi_device_id *ids)
+{
+ return __acpi_match_device(device, ids) ? 0 : -ENOENT;
}
EXPORT_SYMBOL(acpi_match_device_ids);