omap-alsa.h

LINUX 2.6.17.4的源码

/*
 * linux/include/asm-arm/arch-omap/omap-alsa.h
 *
 * Alsa Driver for AIC23 and TSC2101 codecs on OMAP platform boards.
 *
 * Copyright (C) 2006 Mika Laitio <[e-mail]>
 *
 * Copyright (C) 2005 Instituto Nokia de Tecnologia - INdT - Manaus Brazil
 * Written by Daniel Petrini, David Cohen, Anderson Briglia
 *            {daniel.petrini, david.cohen, anderson.briglia}@indt.org.br
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * You should have received a copy of the  GNU General Public License along
 * with this program; if not, write  to the Free Software Foundation, Inc.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  History
 *  -------
 *
 *  2005/07/25 INdT-10LE Kernel Team - 	Alsa driver for omap osk,
 *  					original version based in sa1100 driver
 *  					and omap oss driver.
 */

#ifndef __OMAP_ALSA_H
#define __OMAP_ALSA_H

#include <sound/driver.h>
#include <asm/arch/dma.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <asm/arch/mcbsp.h>
#include <linux/platform_device.h>

#define DMA_BUF_SIZE	(1024 * 8)

/*
 * Buffer management for alsa and dma
 */
struct audio_stream {
	char *id;		/* identification string */
	int stream_id;		/* numeric identification */
	int dma_dev;		/* dma number of that device */
	int *lch;		/* Chain of channels this stream is linked to */
	char started;		/* to store if the chain was started or not */
	int dma_q_head;		/* DMA Channel Q Head */
	int dma_q_tail;		/* DMA Channel Q Tail */
	char dma_q_count;	/* DMA Channel Q Count */
	int active:1;		/* we are using this stream for transfer now */
	int period;		/* current transfer period */
	int periods;		/* current count of periods registerd in the DMA engine */
	spinlock_t dma_lock;	/* for locking in DMA operations */
	snd_pcm_substream_t *stream;	/* the pcm stream */
	unsigned linked:1;	/* dma channels linked */
	int offset;		/* store start position of the last period in the alsa buffer */
	int (*hw_start)(void);  /* interface to start HW interface, e.g. McBSP */
	int (*hw_stop)(void);   /* interface to stop HW interface, e.g. McBSP */
};

/*
 * Alsa card structure for aic23
 */
struct snd_card_omap_codec {
	snd_card_t *card;
	snd_pcm_t *pcm;
	long samplerate;
	struct audio_stream s[2];	/* playback & capture */
};

/* Codec specific information and function pointers.
 * Codec (omap-alsa-aic23.c and omap-alsa-tsc2101.c)
 * are responsible for defining the function pointers.
 */
struct omap_alsa_codec_config {
	char 	*name;
	struct	omap_mcbsp_reg_cfg *mcbsp_regs_alsa;
	snd_pcm_hw_constraint_list_t *hw_constraints_rates;
	snd_pcm_hardware_t *snd_omap_alsa_playback;
	snd_pcm_hardware_t *snd_omap_alsa_capture;
	void	(*codec_configure_dev)(void);
	void	(*codec_set_samplerate)(long);
	void	(*codec_clock_setup)(void);
	int	(*codec_clock_on)(void);
	int 	(*codec_clock_off)(void);
	int	(*get_default_samplerate)(void);
};

/*********** Mixer function prototypes *************************/
int snd_omap_mixer(struct snd_card_omap_codec *);
void snd_omap_init_mixer(void);

#ifdef CONFIG_PM
void snd_omap_suspend_mixer(void);
void snd_omap_resume_mixer(void);
#endif

int snd_omap_alsa_post_probe(struct platform_device *pdev, struct omap_alsa_codec_config *config);
int snd_omap_alsa_remove(struct platform_device *pdev);
#ifdef CONFIG_PM
int snd_omap_alsa_suspend(struct platform_device *pdev, pm_message_t state);
int snd_omap_alsa_resume(struct platform_device *pdev);
#else
#define snd_omap_alsa_suspend	NULL
#define snd_omap_alsa_resume	NULL
#endif

void callback_omap_alsa_sound_dma(void *);

#endif