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Commit 54b78608 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
Browse files

V4L/DVB: tm6000-alsa: rework audio buffer allocation/deallocation 



Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 0e57ff8d

drivers/staging/tm6000/tm6000-alsa.c

+32 −27
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/interrupt.h>

#include <linux/usb.h>

#include <linux/slab.h>

#include <linux/vmalloc.h>



#include <asm/delay.h>

#include <sound/core.h>
@@ -106,19 +107,39 @@ static int _tm6000_stop_audio_dma(struct snd_tm6000_card *chip) 
	return 0;

}



static int dsp_buffer_free(struct snd_tm6000_card *chip)

static void dsp_buffer_free(struct snd_pcm_substream *substream)

{

	BUG_ON(!chip->bufsize);

	struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);



	dprintk(2, "Freeing buffer\n");



	/* FIXME: Frees buffer */

	vfree(substream->runtime->dma_area);

	substream->runtime->dma_area = NULL;

	substream->runtime->dma_bytes = 0;

}



static int dsp_buffer_alloc(struct snd_pcm_substream *substream, int size)

{

	struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);



	chip->bufsize = 0;

	dprintk(2, "Allocating buffer\n");



	if (substream->runtime->dma_area) {

		if (substream->runtime->dma_bytes > size)

			return 0;

		dsp_buffer_free(substream);

	}



	substream->runtime->dma_area = vmalloc(size);

	if (!substream->runtime->dma_area)

		return -ENOMEM;



	substream->runtime->dma_bytes = size;



	return 0;

}





/****************************************************************************

				ALSA PCM Interface

 ****************************************************************************/
@@ -185,23 +206,13 @@ static int snd_tm6000_close(struct snd_pcm_substream *substream) 
static int snd_tm6000_hw_params(struct snd_pcm_substream *substream,

			      struct snd_pcm_hw_params *hw_params)

{

	struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);

	int size, rc;



	if (substream->runtime->dma_area) {

		dsp_buffer_free(chip);

		substream->runtime->dma_area = NULL;

	}



	chip->period_size = params_period_bytes(hw_params);

	chip->num_periods = params_periods(hw_params);

	chip->bufsize = chip->period_size * params_periods(hw_params);



	BUG_ON(!chip->bufsize);



	dprintk(1, "Setting buffer\n");



	/* FIXME: Allocate buffer for audio */

	size = params_period_bytes(hw_params) * params_periods(hw_params);



	rc = dsp_buffer_alloc(substream, size);

	if (rc < 0)

		return rc;



	return 0;

}
@@ -211,13 +222,7 @@ static int snd_tm6000_hw_params(struct snd_pcm_substream *substream, 
 */

static int snd_tm6000_hw_free(struct snd_pcm_substream *substream)

{



	struct snd_tm6000_card *chip = snd_pcm_substream_chip(substream);



	if (substream->runtime->dma_area) {

		dsp_buffer_free(chip);

		substream->runtime->dma_area = NULL;

	}

	dsp_buffer_free(substream);



	return 0;

}

drivers/staging/tm6000/tm6000.h

+0 −4
Original line number Diff line number Diff line
@@ -136,11 +136,7 @@ struct snd_tm6000_card { 
	struct snd_card			*card;

	spinlock_t			reg_lock;

	atomic_t			count;

	unsigned int			period_size;

	unsigned int			num_periods;

	struct tm6000_core		*core;

	struct tm6000_buffer		*buf;

	int				bufsize;

	struct snd_pcm_substream	*substream;

};