arch/arm/plat-omap/include/plat/omap-alsa.h

   1 /*
   2  * arch/arm/plat-omap/include/mach/omap-alsa.h
   3  *
   4  * Alsa Driver for AIC23 and TSC2101 codecs on OMAP platform boards.
   5  *
   6  * Copyright (C) 2006 Mika Laitio <lamikr@cc.jyu.fi>
   7  *
   8  * Copyright (C) 2005 Instituto Nokia de Tecnologia - INdT - Manaus Brazil
   9  * Written by Daniel Petrini, David Cohen, Anderson Briglia
  10  *            {daniel.petrini, david.cohen, anderson.briglia}@indt.org.br
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License as published by the
  14  * Free Software Foundation; either version 2 of the License, or (at your
  15  * option) any later version.
  16  *
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  20  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  23  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  24  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * You should have received a copy of the  GNU General Public License along
  29  * with this program; if not, write  to the Free Software Foundation, Inc.,
  30  * 675 Mass Ave, Cambridge, MA 02139, USA.
  31  *
  32  *  History
  33  *  -------
  34  *
  35  *  2005/07/25 INdT-10LE Kernel Team -  Alsa driver for omap osk,
  36  *                                      original version based in sa1100 driver
  37  *                                      and omap oss driver.
  38  */
  39
  40 #ifndef __OMAP_ALSA_H
  41 #define __OMAP_ALSA_H
  42
  43 #include <plat/dma.h>
  44 #include <sound/core.h>
  45 #include <sound/pcm.h>
  46 #include <plat/mcbsp.h>
  47 #include <linux/platform_device.h>
  48
  49 #define DMA_BUF_SIZE    (1024 * 8)
  50
  51 /*
  52  * Buffer management for alsa and dma
  53  */
  54 struct audio_stream {
  55         char *id;               /* identification string */
  56         int stream_id;          /* numeric identification */
  57         int dma_dev;            /* dma number of that device */
  58         int *lch;               /* Chain of channels this stream is linked to */
  59         char started;           /* to store if the chain was started or not */
  60         int dma_q_head;         /* DMA Channel Q Head */
  61         int dma_q_tail;         /* DMA Channel Q Tail */
  62         char dma_q_count;       /* DMA Channel Q Count */
  63         int active:1;           /* we are using this stream for transfer now */
  64         int period;             /* current transfer period */
  65         int periods;            /* current count of periods registerd in the DMA engine */
  66         spinlock_t dma_lock;    /* for locking in DMA operations */
  67         struct snd_pcm_substream *stream;       /* the pcm stream */
  68         unsigned linked:1;      /* dma channels linked */
  69         int offset;             /* store start position of the last period in the alsa buffer */
  70         int (*hw_start)(void);  /* interface to start HW interface, e.g. McBSP */
  71         int (*hw_stop)(void);   /* interface to stop HW interface, e.g. McBSP */
  72 };
  73
  74 /*
  75  * Alsa card structure for aic23
  76  */
  77 struct snd_card_omap_codec {
  78         struct snd_card *card;
  79         struct snd_pcm *pcm;
  80         long samplerate;
  81         struct audio_stream s[2];       /* playback & capture */
  82 };
  83
  84 /* Codec specific information and function pointers.
  85  * Codec (omap-alsa-aic23.c and omap-alsa-tsc2101.c)
  86  * are responsible for defining the function pointers.
  87  */
  88 struct omap_alsa_codec_config {
  89         char    *name;
  90         struct  omap_mcbsp_reg_cfg *mcbsp_regs_alsa;
  91         struct  snd_pcm_hw_constraint_list *hw_constraints_rates;
  92         struct  snd_pcm_hardware *snd_omap_alsa_playback;
  93         struct  snd_pcm_hardware *snd_omap_alsa_capture;
  94         void    (*codec_configure_dev)(void);
  95         void    (*codec_set_samplerate)(long);
  96         void    (*codec_clock_setup)(void);
  97         int     (*codec_clock_on)(void);
  98         int     (*codec_clock_off)(void);
  99         int     (*get_default_samplerate)(void);
 100 };
 101
 102 /*********** Mixer function prototypes *************************/
 103 int snd_omap_mixer(struct snd_card_omap_codec *);
 104 void snd_omap_init_mixer(void);
 105
 106 #ifdef CONFIG_PM
 107 void snd_omap_suspend_mixer(void);
 108 void snd_omap_resume_mixer(void);
 109 #endif
 110
 111 int snd_omap_alsa_post_probe(struct platform_device *pdev, struct omap_alsa_codec_config *config);
 112 int snd_omap_alsa_remove(struct platform_device *pdev);
 113 #ifdef CONFIG_PM
 114 int snd_omap_alsa_suspend(struct platform_device *pdev, pm_message_t state);
 115 int snd_omap_alsa_resume(struct platform_device *pdev);
 116 #else
 117 #define snd_omap_alsa_suspend   NULL
 118 #define snd_omap_alsa_resume    NULL
 119 #endif
 120
 121 void callback_omap_alsa_sound_dma(void *);
 122
 123 #endif