ALSA: als4000: Use managed buffer allocation

Clean up the driver with the new managed buffer allocation API.
The hw_params and hw_free callbacks became superfluous and got
dropped.

Link: https://lore.kernel.org/r/20191209094943.14984-23-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/als4000.c

@@ -354,18 +354,6 @@ CMD_SIGNED|CMD_STEREO,			/* ALS4000_FORMAT_S16L_STEREO */
 };	
 #define capture_cmd(chip) (capture_cmd_vals[(chip)->capture_format])
 
-static int snd_als4000_hw_params(struct snd_pcm_substream *substream,
-				 struct snd_pcm_hw_params *hw_params)
-{
-	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
-}
-
-static int snd_als4000_hw_free(struct snd_pcm_substream *substream)
-{
-	snd_pcm_lib_free_pages(substream);
-	return 0;
-}
-
 static int snd_als4000_capture_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_sb *chip = snd_pcm_substream_chip(substream);
@@ -633,7 +621,6 @@ static int snd_als4000_playback_close(struct snd_pcm_substream *substream)
 	struct snd_sb *chip = snd_pcm_substream_chip(substream);
 
 	chip->playback_substream = NULL;
-	snd_pcm_lib_free_pages(substream);
 	return 0;
 }
 
@@ -652,7 +639,6 @@ static int snd_als4000_capture_close(struct snd_pcm_substream *substream)
 	struct snd_sb *chip = snd_pcm_substream_chip(substream);
 
 	chip->capture_substream = NULL;
-	snd_pcm_lib_free_pages(substream);
 	return 0;
 }
 
@@ -662,8 +648,6 @@ static const struct snd_pcm_ops snd_als4000_playback_ops = {
 	.open =		snd_als4000_playback_open,
 	.close =	snd_als4000_playback_close,
 	.ioctl =	snd_pcm_lib_ioctl,
-	.hw_params =	snd_als4000_hw_params,
-	.hw_free =	snd_als4000_hw_free,
 	.prepare =	snd_als4000_playback_prepare,
 	.trigger =	snd_als4000_playback_trigger,
 	.pointer =	snd_als4000_playback_pointer
@@ -673,8 +657,6 @@ static const struct snd_pcm_ops snd_als4000_capture_ops = {
 	.open =		snd_als4000_capture_open,
 	.close =	snd_als4000_capture_close,
 	.ioctl =	snd_pcm_lib_ioctl,
-	.hw_params =	snd_als4000_hw_params,
-	.hw_free =	snd_als4000_hw_free,
 	.prepare =	snd_als4000_capture_prepare,
 	.trigger =	snd_als4000_capture_trigger,
 	.pointer =	snd_als4000_capture_pointer
@@ -693,9 +675,8 @@ static int snd_als4000_pcm(struct snd_sb *chip, int device)
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_als4000_playback_ops);
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_als4000_capture_ops);
 
-	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
-					      &chip->pci->dev,
-					      64*1024, 64*1024);
+	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
+				       &chip->pci->dev, 64*1024, 64*1024);
 
 	chip->pcm = pcm;