ALSA: hiface: 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/20191209094943.14984-67-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/hiface/pcm.c

@@ -415,18 +415,6 @@ static int hiface_pcm_close(struct snd_pcm_substream *alsa_sub)
 	return 0;
 }
 
-static int hiface_pcm_hw_params(struct snd_pcm_substream *alsa_sub,
-				struct snd_pcm_hw_params *hw_params)
-{
-	return snd_pcm_lib_malloc_pages(alsa_sub,
-					params_buffer_bytes(hw_params));
-}
-
-static int hiface_pcm_hw_free(struct snd_pcm_substream *alsa_sub)
-{
-	return snd_pcm_lib_free_pages(alsa_sub);
-}
-
 static int hiface_pcm_prepare(struct snd_pcm_substream *alsa_sub)
 {
 	struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub);
@@ -513,8 +501,6 @@ static const struct snd_pcm_ops pcm_ops = {
 	.open = hiface_pcm_open,
 	.close = hiface_pcm_close,
 	.ioctl = snd_pcm_lib_ioctl,
-	.hw_params = hiface_pcm_hw_params,
-	.hw_free = hiface_pcm_hw_free,
 	.prepare = hiface_pcm_prepare,
 	.trigger = hiface_pcm_trigger,
 	.pointer = hiface_pcm_pointer,
@@ -613,8 +599,8 @@ int hiface_pcm_init(struct hiface_chip *chip, u8 extra_freq)
 
 	strlcpy(pcm->name, "USB-SPDIF Audio", sizeof(pcm->name));
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_ops);
-	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_VMALLOC,
-					      NULL, 0, 0);
+	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC,
+				       NULL, 0, 0);
 
 	rt->instance = pcm;