From: Mika Westerberg <mika.westerb...@linux.intel.com>
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.westerb...@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
---
drivers/acpi/scan.c | 40 +++++++++++++++++++++++++++++++++++-----
include/linux/acpi.h | 28 ++++++++++++++++++++++++++++
2 files changed, 63 insertions(+), 5 deletions(-)
Index: linux/drivers/acpi/scan.c
===================================================================
--- linux.orig/drivers/acpi/scan.c
+++ linux/drivers/acpi/scan.c
@@ -372,8 +372,8 @@ static void acpi_device_remove_files(str
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;
@@ -383,14 +383,44 @@ int acpi_match_device_ids(struct acpi_de
* 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 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;
- return -ENOENT;
+ 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);
Index: linux/include/linux/acpi.h
===================================================================
--- linux.orig/include/linux/acpi.h
+++ linux/include/linux/acpi.h
@@ -26,6 +26,7 @@
#define _LINUX_ACPI_H
#include <linux/ioport.h> /* for struct resource */
+#include <linux/device.h>
#ifdef CONFIG_ACPI
@@ -368,6 +369,17 @@ extern int acpi_nvs_register(__u64 start
extern int acpi_nvs_for_each_region(int (*func)(__u64, __u64, void *),
void *data);
+const struct acpi_device_id *acpi_match_device(const struct acpi_device_id
*ids,
+ const struct device *dev);
+
+static inline bool acpi_driver_match_device(struct device *dev,
+ const struct device_driver *drv)
+{
+ return !!acpi_match_device(drv->acpi_match_table, dev);
+}
+
+#define ACPI_PTR(_ptr) (_ptr)
+
#else /* !CONFIG_ACPI */
#define acpi_disabled 1
@@ -422,6 +434,22 @@ static inline int acpi_nvs_for_each_regi
return 0;
}
+struct acpi_device_id;
+
+static inline const struct acpi_device_id *acpi_match_device(
+ const struct acpi_device_id *ids, const struct device *dev)
+{
+ return NULL;
+}
+
+static inline bool acpi_driver_match_device(struct device *dev,
+ const struct device_driver *drv)
+{
+ return false;
+}
+
+#define ACPI_PTR(_ptr) (NULL)
+
#endif /* !CONFIG_ACPI */
#ifdef CONFIG_ACPI
--
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