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omap-alsa.h

/*
 * arch/arm/plat-omap/include/mach/omap-alsa.h
 *
 * Alsa Driver for AIC23 and TSC2101 codecs on OMAP platform boards.
 *
 * Copyright (C) 2006 Mika Laitio <lamikr@cc.jyu.fi>
 *
 * 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 <mach/dma.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <mach/mcbsp.h>
#include <linux/platform_device.h>

#define DMA_BUF_SIZE    (1024 * 8)

/*
 * Buffer management for alsa and dma
 */
00054 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 */
      struct snd_pcm_substream *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
 */
00077 struct snd_card_omap_codec {
      struct snd_card *card;
      struct snd_pcm *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.
 */
00088 struct omap_alsa_codec_config {
      char  *name;
      struct      omap_mcbsp_reg_cfg *mcbsp_regs_alsa;
      struct      snd_pcm_hw_constraint_list *hw_constraints_rates;
      struct      snd_pcm_hardware *snd_omap_alsa_playback;
      struct      snd_pcm_hardware *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

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