ACPI / bus: Introduce acpi_get_match_data() function

OF has of_device_get_match_data() function to extract driver specific data
structure. Add a similar function for ACPI.

Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

2 files changed, 24 insertions, 0 deletions

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 4d0979e02a28..f87ed3be779a 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -785,6 +785,24 @@ const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 }
 EXPORT_SYMBOL_GPL(acpi_match_device);
 
+void *acpi_get_match_data(const struct device *dev)
+{
+        const struct acpi_device_id *match;
+
+        if (!dev->driver)
+                return NULL;
+
+        if (!dev->driver->acpi_match_table)
+                return NULL;
+
+        match = acpi_match_device(dev->driver->acpi_match_table, dev);
+        if (!match)
+                return NULL;
+
+        return (void *)match->driver_data;
+}
+EXPORT_SYMBOL_GPL(acpi_get_match_data);
+
 int acpi_match_device_ids(struct acpi_device *device,
                           const struct acpi_device_id *ids)
 {
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index dc1ebfeeb5ec..927873751323 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -584,6 +584,7 @@ extern int acpi_nvs_for_each_region(int (*func)(__u64, __u64, void *),
 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
                                                const struct device *dev);
 
+void *acpi_get_match_data(const struct device *dev);
 extern bool acpi_driver_match_device(struct device *dev,
                                      const struct device_driver *drv);
 int acpi_device_uevent_modalias(struct device *, struct kobj_uevent_env *);
@@ -755,6 +756,11 @@ static inline const struct acpi_device_id *acpi_match_device(
         return NULL;
 }
 
+static inline void *acpi_get_match_data(const struct device *dev)
+{
+        return NULL;
+}
+
 static inline bool acpi_driver_match_device(struct device *dev,
                                             const struct device_driver *drv)
 {