ALSA: pdaudiocf: 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/20191209094943.14984-58-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pcmcia/pdaudiocf/pdaudiocf_pcm.c

@@ -83,23 +83,6 @@ static int pdacf_pcm_trigger(struct snd_pcm_substream *subs, int cmd)
 	return ret;
 }
 
-/*
- * pdacf_pcm_hw_params - hw_params callback for playback and capture
- */
-static int pdacf_pcm_hw_params(struct snd_pcm_substream *subs,
-				     struct snd_pcm_hw_params *hw_params)
-{
-	return snd_pcm_lib_malloc_pages(subs, params_buffer_bytes(hw_params));
-}
-
-/*
- * pdacf_pcm_hw_free - hw_free callback for playback and capture
- */
-static int pdacf_pcm_hw_free(struct snd_pcm_substream *subs)
-{
-	return snd_pcm_lib_free_pages(subs);
-}
-
 /*
  * pdacf_pcm_prepare - prepare callback for playback and capture
  */
@@ -256,8 +239,6 @@ static const struct snd_pcm_ops pdacf_pcm_capture_ops = {
 	.open =		pdacf_pcm_capture_open,
 	.close =	pdacf_pcm_capture_close,
 	.ioctl =	snd_pcm_lib_ioctl,
-	.hw_params =	pdacf_pcm_hw_params,
-	.hw_free =	pdacf_pcm_hw_free,
 	.prepare =	pdacf_pcm_prepare,
 	.trigger =	pdacf_pcm_trigger,
 	.pointer =	pdacf_pcm_capture_pointer,
@@ -277,7 +258,7 @@ int snd_pdacf_pcm_new(struct snd_pdacf *chip)
 		return err;
 		
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pdacf_pcm_capture_ops);
-	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_VMALLOC,
+	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC,
 				       snd_dma_continuous_data(GFP_KERNEL | GFP_DMA32),
 				       0, 0);