ALSA: hda - add HDA default codec match function

HDA codec drivers can be matched using vendor id and revision id typically.
So provide a match function which does this and is loaded when driver hasn't
provided one (default behaviour)

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 41 insertions, 0 deletions

diff --git a/sound/hda/hda_bus_type.c b/sound/hda/hda_bus_type.c
index 519914a12e8a..89c2711baaaf 100644
--- a/sound/hda/hda_bus_type.c
+++ b/sound/hda/hda_bus_type.c
@@ -10,6 +10,40 @@
 MODULE_DESCRIPTION("HD-audio bus");
 MODULE_LICENSE("GPL");
 
+/**
+ * hdac_get_device_id - gets the hdac device id entry
+ * @hdev: HD-audio core device
+ * @drv: HD-audio codec driver
+ *
+ * Compares the hdac device vendor_id and revision_id to the hdac_device
+ * driver id_table and returns the matching device id entry.
+ */
+const struct hda_device_id *
+hdac_get_device_id(struct hdac_device *hdev, struct hdac_driver *drv)
+{
+        if (drv->id_table) {
+                const struct hda_device_id *id  = drv->id_table;
+
+                while (id->vendor_id) {
+                        if (hdev->vendor_id == id->vendor_id &&
+                                (!id->rev_id || id->rev_id == hdev->revision_id))
+                                return id;
+                        id++;
+                }
+        }
+
+        return NULL;
+}
+EXPORT_SYMBOL_GPL(hdac_get_device_id);
+
+static int hdac_codec_match(struct hdac_device *dev, struct hdac_driver *drv)
+{
+        if (hdac_get_device_id(dev, drv))
+                return 1;
+        else
+                return 0;
+}
+
 static int hda_bus_match(struct device *dev, struct device_driver *drv)
 {
         struct hdac_device *hdev = dev_to_hdac_dev(dev);
@@ -17,8 +51,15 @@ static int hda_bus_match(struct device *dev, struct device_driver *drv)
 
         if (hdev->type != hdrv->type)
                 return 0;
+
+        /*
+         * if driver provided a match function use that otherwise we will
+         * use hdac_codec_match function
+         */
         if (hdrv->match)
                 return hdrv->match(hdev, hdrv);
+        else
+                return hdac_codec_match(hdev, hdrv);
         return 1;
 }