staging: bcm2835-audio: 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 dropped.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20191210141356.18074-3-tiwai@suse.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c

@@ -193,17 +193,6 @@ static int snd_bcm2835_playback_close(struct snd_pcm_substream *substream)
 	return 0;
 }
 
-static int snd_bcm2835_pcm_hw_params(struct snd_pcm_substream *substream,
-	struct snd_pcm_hw_params *params)
-{
-	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
-}
-
-static int snd_bcm2835_pcm_hw_free(struct snd_pcm_substream *substream)
-{
-	return snd_pcm_lib_free_pages(substream);
-}
-
 static int snd_bcm2835_pcm_prepare(struct snd_pcm_substream *substream)
 {
 	struct bcm2835_chip *chip = snd_pcm_substream_chip(substream);
@@ -317,8 +306,6 @@ static const struct snd_pcm_ops snd_bcm2835_playback_ops = {
 	.open = snd_bcm2835_playback_open,
 	.close = snd_bcm2835_playback_close,
 	.ioctl = snd_pcm_lib_ioctl,
-	.hw_params = snd_bcm2835_pcm_hw_params,
-	.hw_free = snd_bcm2835_pcm_hw_free,
 	.prepare = snd_bcm2835_pcm_prepare,
 	.trigger = snd_bcm2835_pcm_trigger,
 	.pointer = snd_bcm2835_pcm_pointer,
@@ -329,8 +316,6 @@ static const struct snd_pcm_ops snd_bcm2835_playback_spdif_ops = {
 	.open = snd_bcm2835_playback_spdif_open,
 	.close = snd_bcm2835_playback_close,
 	.ioctl = snd_pcm_lib_ioctl,
-	.hw_params = snd_bcm2835_pcm_hw_params,
-	.hw_free = snd_bcm2835_pcm_hw_free,
 	.prepare = snd_bcm2835_pcm_prepare,
 	.trigger = snd_bcm2835_pcm_trigger,
 	.pointer = snd_bcm2835_pcm_pointer,
@@ -362,7 +347,7 @@ int snd_bcm2835_new_pcm(struct bcm2835_chip *chip, const char *name,
 			spdif ? &snd_bcm2835_playback_spdif_ops :
 			&snd_bcm2835_playback_ops);
 
-	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
+	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
 		chip->card->dev, 128 * 1024, 128 * 1024);
 
 	if (spdif)