ALSA: es1938: 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/20191209094943.14984-39-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/es1938.c

@@ -863,25 +863,6 @@ static int snd_es1938_capture_copy_kernel(struct snd_pcm_substream *substream,
 	return 0;
 }
 
-/*
- * buffer management
- */
-static int snd_es1938_pcm_hw_params(struct snd_pcm_substream *substream,
-				    struct snd_pcm_hw_params *hw_params)
-
-{
-	int err;
-
-	if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
-		return err;
-	return 0;
-}
-
-static int snd_es1938_pcm_hw_free(struct snd_pcm_substream *substream)
-{
-	return snd_pcm_lib_free_pages(substream);
-}
-
 /* ----------------------------------------------------------------------
  * Audio1 Capture (ADC)
  * ----------------------------------------------------------------------*/
@@ -997,8 +978,6 @@ static const struct snd_pcm_ops snd_es1938_playback_ops = {
 	.open =		snd_es1938_playback_open,
 	.close =	snd_es1938_playback_close,
 	.ioctl =	snd_pcm_lib_ioctl,
-	.hw_params =	snd_es1938_pcm_hw_params,
-	.hw_free =	snd_es1938_pcm_hw_free,
 	.prepare =	snd_es1938_playback_prepare,
 	.trigger =	snd_es1938_playback_trigger,
 	.pointer =	snd_es1938_playback_pointer,
@@ -1008,8 +987,6 @@ static const struct snd_pcm_ops snd_es1938_capture_ops = {
 	.open =		snd_es1938_capture_open,
 	.close =	snd_es1938_capture_close,
 	.ioctl =	snd_pcm_lib_ioctl,
-	.hw_params =	snd_es1938_pcm_hw_params,
-	.hw_free =	snd_es1938_pcm_hw_free,
 	.prepare =	snd_es1938_capture_prepare,
 	.trigger =	snd_es1938_capture_trigger,
 	.pointer =	snd_es1938_capture_pointer,
@@ -1031,9 +1008,8 @@ static int snd_es1938_new_pcm(struct es1938 *chip, int device)
 	pcm->info_flags = 0;
 	strcpy(pcm->name, "ESS Solo-1");
 
-	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;
 	return 0;