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

This patch provide a new common helper function,
snd_hdac_codec_modalias(), to give the codec modalias name string.
This function will be used by multiple places in the later patches.

Reviewed-by: Vinod Koul <vinod.koul@intel.com>
Tested-by: Subhransu S Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
index ddca48eb02e0049abb2be46e1c74aba90ea10ea7..e2b712c90d3f22d4bcbb75ded3a296304d23d7c6 100644 (file)
--- a/include/sound/hdaudio.h
+++ b/include/sound/hdaudio.h
@@ -109,6 +109,7 @@ void snd_hdac_device_exit(struct hdac_device *dev);
 int snd_hdac_device_register(struct hdac_device *codec);
 void snd_hdac_device_unregister(struct hdac_device *codec);
 int snd_hdac_device_set_chip_name(struct hdac_device *codec, const char *name);
+int snd_hdac_codec_modalias(struct hdac_device *hdac, char *buf, size_t size);
 
 int snd_hdac_refresh_widgets(struct hdac_device *codec);
 int snd_hdac_refresh_widget_sysfs(struct hdac_device *codec);

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