ALSA: hda - Add a common helper to give the codec modalias string

[linux-drm-fsl-dcu.git] / sound / hda / hdac_device.c

diff --git a/sound/hda/hdac_device.c b/sound/hda/hdac_device.c
index 4b06b26cee06411d490d8ff49c1c2429f033dc4c..bbdb25f5bbb91a1ad63e59f7b0093fe684952ebb 100644 (file)
--- a/sound/hda/hdac_device.c
+++ b/sound/hda/hdac_device.c
@@ -185,6 +185,21 @@ int snd_hdac_device_set_chip_name(struct hdac_device *codec, const char *name)
 }
 EXPORT_SYMBOL_GPL(snd_hdac_device_set_chip_name);
 
+/**
+ * snd_hdac_codec_modalias - give the module alias name
+ * @codec: HDAC device
+ * @buf: string buffer to store
+ * @size: string buffer size
+ *
+ * Returns the size of string, like snprintf(), or a negative error code.
+ */
+int snd_hdac_codec_modalias(struct hdac_device *codec, char *buf, size_t size)
+{
+       return snprintf(buf, size, "hdaudio:v%08Xr%08Xa%02X\n",
+                       codec->vendor_id, codec->revision_id, codec->type);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_codec_modalias);
+
 /**
  * snd_hdac_make_cmd - compose a 32bit command word to be sent to the
  *     HD-audio controller