ALSA: pcm: Embed struct device

Like previous patches, at this time we embed the struct device into
PCM object.  However, this needs a bit more caution: struct snd_pcm
doesn't own one device but two, for both playback and capture!  Thus
not struct snd_pcm but struct snd_pcm_str object contains the device.

Along with this change, pcm->dev field is dropped for avoiding
confusion.  It was meant to point to a non-standard parent.  But,
since now we can touch each struct device directly, we can manipulate
the parent field easily there, too.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/aoa/soundbus/i2sbus/pcm.c

@@ -968,7 +968,6 @@ i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
 			printk(KERN_DEBUG "i2sbus: failed to create pcm\n");
 			goto out_put_ci_module;
 		}
-		dev->pcm->dev = &dev->ofdev.dev;
 	}
 
 	/* ALSA yet again sucks.
@@ -988,6 +987,8 @@ i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
 			goto out_put_ci_module;
 		snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK,
 				&i2sbus_playback_ops);
+		dev->pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].dev.parent =
+			&dev->ofdev.dev;
 		i2sdev->out.created = 1;
 	}
 
@@ -1003,6 +1004,8 @@ i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
 			goto out_put_ci_module;
 		snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE,
 				&i2sbus_record_ops);
+		dev->pcm->streams[SNDRV_PCM_STREAM_CAPTURE].dev.parent =
+			&dev->ofdev.dev;
 		i2sdev->in.created = 1;
 	}