include/sound/soc-dai.h

   1 /*
   2  * linux/sound/soc-dai.h -- ALSA SoC Layer
   3  *
   4  * Copyright:   2005-2008 Wolfson Microelectronics. PLC.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * Digital Audio Interface (DAI) API.
  11  */
  12
  13 #ifndef __LINUX_SND_SOC_DAI_H
  14 #define __LINUX_SND_SOC_DAI_H
  15
  16
  17 #include <linux/list.h>
  18
  19 struct snd_pcm_substream;
  20
  21 /*
  22  * DAI hardware audio formats.
  23  *
  24  * Describes the physical PCM data formating and clocking. Add new formats
  25  * to the end.
  26  */
  27 #define SND_SOC_DAIFMT_I2S              0 /* I2S mode */
  28 #define SND_SOC_DAIFMT_RIGHT_J          1 /* Right Justified mode */
  29 #define SND_SOC_DAIFMT_LEFT_J           2 /* Left Justified mode */
  30 #define SND_SOC_DAIFMT_DSP_A            3 /* L data MSB after FRM LRC */
  31 #define SND_SOC_DAIFMT_DSP_B            4 /* L data MSB during FRM LRC */
  32 #define SND_SOC_DAIFMT_AC97             5 /* AC97 */
  33
  34 /* left and right justified also known as MSB and LSB respectively */
  35 #define SND_SOC_DAIFMT_MSB              SND_SOC_DAIFMT_LEFT_J
  36 #define SND_SOC_DAIFMT_LSB              SND_SOC_DAIFMT_RIGHT_J
  37
  38 /*
  39  * DAI Clock gating.
  40  *
  41  * DAI bit clocks can be be gated (disabled) when the DAI is not
  42  * sending or receiving PCM data in a frame. This can be used to save power.
  43  */
  44 #define SND_SOC_DAIFMT_CONT             (0 << 4) /* continuous clock */
  45 #define SND_SOC_DAIFMT_GATED            (1 << 4) /* clock is gated */
  46
  47 /*
  48  * DAI hardware signal inversions.
  49  *
  50  * Specifies whether the DAI can also support inverted clocks for the specified
  51  * format.
  52  */
  53 #define SND_SOC_DAIFMT_NB_NF            (0 << 8) /* normal bit clock + frame */
  54 #define SND_SOC_DAIFMT_NB_IF            (1 << 8) /* normal BCLK + inv FRM */
  55 #define SND_SOC_DAIFMT_IB_NF            (2 << 8) /* invert BCLK + nor FRM */
  56 #define SND_SOC_DAIFMT_IB_IF            (3 << 8) /* invert BCLK + FRM */
  57
  58 /*
  59  * DAI hardware clock masters.
  60  *
  61  * This is wrt the codec, the inverse is true for the interface
  62  * i.e. if the codec is clk and FRM master then the interface is
  63  * clk and frame slave.
  64  */
  65 #define SND_SOC_DAIFMT_CBM_CFM          (0 << 12) /* codec clk & FRM master */
  66 #define SND_SOC_DAIFMT_CBS_CFM          (1 << 12) /* codec clk slave & FRM master */
  67 #define SND_SOC_DAIFMT_CBM_CFS          (2 << 12) /* codec clk master & frame slave */
  68 #define SND_SOC_DAIFMT_CBS_CFS          (3 << 12) /* codec clk & FRM slave */
  69
  70 #define SND_SOC_DAIFMT_FORMAT_MASK      0x000f
  71 #define SND_SOC_DAIFMT_CLOCK_MASK       0x00f0
  72 #define SND_SOC_DAIFMT_INV_MASK         0x0f00
  73 #define SND_SOC_DAIFMT_MASTER_MASK      0xf000
  74
  75 /*
  76  * Master Clock Directions
  77  */
  78 #define SND_SOC_CLOCK_IN                0
  79 #define SND_SOC_CLOCK_OUT               1
  80
  81 #define SND_SOC_STD_AC97_FMTS (SNDRV_PCM_FMTBIT_S8 |\
  82                                SNDRV_PCM_FMTBIT_S16_LE |\
  83                                SNDRV_PCM_FMTBIT_S16_BE |\
  84                                SNDRV_PCM_FMTBIT_S20_3LE |\
  85                                SNDRV_PCM_FMTBIT_S20_3BE |\
  86                                SNDRV_PCM_FMTBIT_S24_3LE |\
  87                                SNDRV_PCM_FMTBIT_S24_3BE |\
  88                                SNDRV_PCM_FMTBIT_S32_LE |\
  89                                SNDRV_PCM_FMTBIT_S32_BE)
  90
  91 struct snd_soc_dai_ops;
  92 struct snd_soc_dai;
  93 struct snd_ac97_bus_ops;
  94
  95 /* Digital Audio Interface registration */
  96 int snd_soc_register_dai(struct snd_soc_dai *dai);
  97 void snd_soc_unregister_dai(struct snd_soc_dai *dai);
  98 int snd_soc_register_dais(struct snd_soc_dai *dai, size_t count);
  99 void snd_soc_unregister_dais(struct snd_soc_dai *dai, size_t count);
 100
 101 /* Digital Audio Interface clocking API.*/
 102 int snd_soc_dai_set_sysclk(struct snd_soc_dai *dai, int clk_id,
 103         unsigned int freq, int dir);
 104
 105 int snd_soc_dai_set_clkdiv(struct snd_soc_dai *dai,
 106         int div_id, int div);
 107
 108 int snd_soc_dai_set_pll(struct snd_soc_dai *dai,
 109         int pll_id, unsigned int freq_in, unsigned int freq_out);
 110
 111 /* Digital Audio interface formatting */
 112 int snd_soc_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt);
 113
 114 int snd_soc_dai_set_tdm_slot(struct snd_soc_dai *dai,
 115         unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width);
 116
 117 int snd_soc_dai_set_tristate(struct snd_soc_dai *dai, int tristate);
 118
 119 /* Digital Audio Interface mute */
 120 int snd_soc_dai_digital_mute(struct snd_soc_dai *dai, int mute);
 121
 122 /*
 123  * Digital Audio Interface.
 124  *
 125  * Describes the Digital Audio Interface in terms of its ALSA, DAI and AC97
 126  * operations and capabilities. Codec and platform drivers will register this
 127  * structure for every DAI they have.
 128  *
 129  * This structure covers the clocking, formating and ALSA operations for each
 130  * interface.
 131  */
 132 struct snd_soc_dai_ops {
 133         /*
 134          * DAI clocking configuration, all optional.
 135          * Called by soc_card drivers, normally in their hw_params.
 136          */
 137         int (*set_sysclk)(struct snd_soc_dai *dai,
 138                 int clk_id, unsigned int freq, int dir);
 139         int (*set_pll)(struct snd_soc_dai *dai,
 140                 int pll_id, unsigned int freq_in, unsigned int freq_out);
 141         int (*set_clkdiv)(struct snd_soc_dai *dai, int div_id, int div);
 142
 143         /*
 144          * DAI format configuration
 145          * Called by soc_card drivers, normally in their hw_params.
 146          */
 147         int (*set_fmt)(struct snd_soc_dai *dai, unsigned int fmt);
 148         int (*set_tdm_slot)(struct snd_soc_dai *dai,
 149                 unsigned int tx_mask, unsigned int rx_mask,
 150                 int slots, int slot_width);
 151         int (*set_tristate)(struct snd_soc_dai *dai, int tristate);
 152
 153         /*
 154          * DAI digital mute - optional.
 155          * Called by soc-core to minimise any pops.
 156          */
 157         int (*digital_mute)(struct snd_soc_dai *dai, int mute);
 158
 159         /*
 160          * ALSA PCM audio operations - all optional.
 161          * Called by soc-core during audio PCM operations.
 162          */
 163         int (*startup)(struct snd_pcm_substream *,
 164                 struct snd_soc_dai *);
 165         void (*shutdown)(struct snd_pcm_substream *,
 166                 struct snd_soc_dai *);
 167         int (*hw_params)(struct snd_pcm_substream *,
 168                 struct snd_pcm_hw_params *, struct snd_soc_dai *);
 169         int (*hw_free)(struct snd_pcm_substream *,
 170                 struct snd_soc_dai *);
 171         int (*prepare)(struct snd_pcm_substream *,
 172                 struct snd_soc_dai *);
 173         int (*trigger)(struct snd_pcm_substream *, int,
 174                 struct snd_soc_dai *);
 175 };
 176
 177 /*
 178  * Digital Audio Interface runtime data.
 179  *
 180  * Holds runtime data for a DAI.
 181  */
 182 struct snd_soc_dai {
 183         /* DAI description */
 184         char *name;
 185         unsigned int id;
 186         int ac97_control;
 187
 188         struct device *dev;
 189         void *ac97_pdata;       /* platform_data for the ac97 codec */
 190
 191         /* DAI callbacks */
 192         int (*probe)(struct platform_device *pdev,
 193                      struct snd_soc_dai *dai);
 194         void (*remove)(struct platform_device *pdev,
 195                        struct snd_soc_dai *dai);
 196         int (*suspend)(struct snd_soc_dai *dai);
 197         int (*resume)(struct snd_soc_dai *dai);
 198
 199         /* ops */
 200         struct snd_soc_dai_ops *ops;
 201
 202         /* DAI capabilities */
 203         struct snd_soc_pcm_stream capture;
 204         struct snd_soc_pcm_stream playback;
 205         unsigned int symmetric_rates:1;
 206
 207         /* DAI runtime info */
 208         struct snd_pcm_runtime *runtime;
 209         struct snd_soc_codec *codec;
 210         unsigned int active;
 211         unsigned char pop_wait:1;
 212         void *dma_data;
 213
 214         /* DAI private data */
 215         void *private_data;
 216
 217         /* parent platform */
 218         struct snd_soc_platform *platform;
 219
 220         struct list_head list;
 221 };
 222
 223 #endif