ALSA: hda - Create own device struct for each codec

As the HD-audio is treated individually in each codec driver, it's
more convenient to assign an own struct device to each codec object.
Then we'll be able to use dev_err() more easily for each codec, for
example.

For achieving it, this patch just creates an object "hdaudioCxDy".
It belongs to sound class instead of creating a new bus, just for
simplicity, at this stage.  No pm ops is implemented in the device
struct level but currently it's merely a container.  The PCM and hwdep
devices are now children of this codec device.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_codec.c

@@ -1368,7 +1368,7 @@ static void snd_hda_codec_free(struct hda_codec *codec)
 	kfree(codec->modelname);
 	kfree(codec->wcaps);
 	codec->bus->num_codecs--;
-	kfree(codec);
+	put_device(&codec->dev);
 }
 
 static bool snd_hda_codec_get_supported_ps(struct hda_codec *codec,
@@ -1377,12 +1377,33 @@ static bool snd_hda_codec_get_supported_ps(struct hda_codec *codec,
 static unsigned int hda_set_power_state(struct hda_codec *codec,
 				unsigned int power_state);
 
+static int snd_hda_codec_dev_register(struct snd_device *device)
+{
+	struct hda_codec *codec = device->device_data;
+
+	return device_add(&codec->dev);
+}
+
+static int snd_hda_codec_dev_disconnect(struct snd_device *device)
+{
+	struct hda_codec *codec = device->device_data;
+
+	device_del(&codec->dev);
+	return 0;
+}
+
 static int snd_hda_codec_dev_free(struct snd_device *device)
 {
 	snd_hda_codec_free(device->device_data);
 	return 0;
 }
 
+/* just free the container */
+static void snd_hda_codec_dev_release(struct device *dev)
+{
+	kfree(container_of(dev, struct hda_codec, dev));
+}
+
 /**
  * snd_hda_codec_new - create a HDA codec
  * @bus: the bus to assign
@@ -1400,6 +1421,8 @@ int snd_hda_codec_new(struct hda_bus *bus,
 	hda_nid_t fg;
 	int err;
 	static struct snd_device_ops dev_ops = {
+		.dev_register = snd_hda_codec_dev_register,
+		.dev_disconnect = snd_hda_codec_dev_disconnect,
 		.dev_free = snd_hda_codec_dev_free,
 	};
 
@@ -1420,6 +1443,13 @@ int snd_hda_codec_new(struct hda_bus *bus,
 		return -ENOMEM;
 	}
 
+	device_initialize(&codec->dev);
+	codec->dev.parent = &bus->card->card_dev;
+	codec->dev.class = sound_class;
+	codec->dev.release = snd_hda_codec_dev_release;
+	dev_set_name(&codec->dev, "hdaudioC%dD%d", bus->card->number,
+		     codec_addr);
+
 	codec->bus = bus;
 	codec->addr = codec_addr;
 	mutex_init(&codec->spdif_mutex);
@@ -1453,8 +1483,8 @@ int snd_hda_codec_new(struct hda_bus *bus,
 	if (codec->bus->modelname) {
 		codec->modelname = kstrdup(codec->bus->modelname, GFP_KERNEL);
 		if (!codec->modelname) {
-			snd_hda_codec_free(codec);
-			return -ENODEV;
+			err = -ENODEV;
+			goto error;
 		}
 	}
 

sound/pci/hda/hda_codec.h

@@ -271,6 +271,7 @@ struct hda_pcm {
 
 /* codec information */
 struct hda_codec {
+	struct device dev;
 	struct hda_bus *bus;
 	unsigned int addr;	/* codec addr*/
 	struct list_head list;	/* list point */

sound/pci/hda/hda_hwdep.c

@@ -155,6 +155,9 @@ int snd_hda_create_hwdep(struct hda_codec *codec)
 	snd_array_init(&codec->hints, sizeof(struct hda_hint), 32);
 	snd_array_init(&codec->user_pins, sizeof(struct hda_pincfg), 16);
 
+	/* link to codec */
+	hwdep->dev = &codec->dev;
+
 	return 0;
 }
 

sound/pci/hda/hda_intel.c

@@ -2663,6 +2663,8 @@ azx_attach_pcm_stream(struct hda_bus *bus, struct hda_codec *codec,
 	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
 					      snd_dma_pci_data(chip->pci),
 					      size, MAX_PREALLOC_SIZE);
+	/* link to codec */
+	pcm->dev = &codec->dev;
 	return 0;
 }