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authorVinod Koul <vinod.koul@intel.com>2015-06-03 09:54:31 +0300
committerTakashi Iwai <tiwai@suse.de>2015-06-03 12:58:49 +0300
commitec71efc9aaa53b8944b119f8bedd0559c8ed5453 (patch)
tree8fa129032db0ae14c7717b8d26879a6b1c90563a
parent03b135cebc47d75ea2dc346770374ab741966955 (diff)
downloadlinux-ec71efc9aaa53b8944b119f8bedd0559c8ed5453.tar.xz
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>
-rw-r--r--include/sound/hdaudio.h14
-rw-r--r--sound/hda/hda_bus_type.c41
2 files changed, 55 insertions, 0 deletions
diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
index 64fff4db81bb..4caf1fde8a4f 100644
--- a/include/sound/hdaudio.h
+++ b/include/sound/hdaudio.h
@@ -28,6 +28,16 @@ struct hdac_widget_tree;
extern struct bus_type snd_hda_bus_type;
/*
+ * HDA device table
+ */
+struct hda_device_id {
+ __u32 vendor_id;
+ __u32 rev_id;
+ const char *name;
+ unsigned long driver_data;
+};
+
+/*
* generic arrays
*/
struct snd_array {
@@ -171,12 +181,16 @@ static inline void snd_hdac_power_down_pm(struct hdac_device *codec) {}
struct hdac_driver {
struct device_driver driver;
int type;
+ const struct hda_device_id *id_table;
int (*match)(struct hdac_device *dev, struct hdac_driver *drv);
void (*unsol_event)(struct hdac_device *dev, unsigned int event);
};
#define drv_to_hdac_driver(_drv) container_of(_drv, struct hdac_driver, driver)
+const struct hda_device_id *
+hdac_get_device_id(struct hdac_device *hdev, struct hdac_driver *drv);
+
/*
* Bus verb operators
*/
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;
}