linux/include/sound/soc-dai.h
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   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
  19struct snd_pcm_substream;
  20struct snd_soc_dapm_widget;
  21struct snd_compr_stream;
  22
  23/*
  24 * DAI hardware audio formats.
  25 *
  26 * Describes the physical PCM data formating and clocking. Add new formats
  27 * to the end.
  28 */
  29#define SND_SOC_DAIFMT_I2S              1 /* I2S mode */
  30#define SND_SOC_DAIFMT_RIGHT_J          2 /* Right Justified mode */
  31#define SND_SOC_DAIFMT_LEFT_J           3 /* Left Justified mode */
  32#define SND_SOC_DAIFMT_DSP_A            4 /* L data MSB after FRM LRC */
  33#define SND_SOC_DAIFMT_DSP_B            5 /* L data MSB during FRM LRC */
  34#define SND_SOC_DAIFMT_AC97             6 /* AC97 */
  35#define SND_SOC_DAIFMT_PDM              7 /* Pulse density modulation */
  36
  37/* left and right justified also known as MSB and LSB respectively */
  38#define SND_SOC_DAIFMT_MSB              SND_SOC_DAIFMT_LEFT_J
  39#define SND_SOC_DAIFMT_LSB              SND_SOC_DAIFMT_RIGHT_J
  40
  41/*
  42 * DAI Clock gating.
  43 *
  44 * DAI bit clocks can be be gated (disabled) when the DAI is not
  45 * sending or receiving PCM data in a frame. This can be used to save power.
  46 */
  47#define SND_SOC_DAIFMT_CONT             (1 << 4) /* continuous clock */
  48#define SND_SOC_DAIFMT_GATED            (2 << 4) /* clock is gated */
  49
  50/*
  51 * DAI hardware signal inversions.
  52 *
  53 * Specifies whether the DAI can also support inverted clocks for the specified
  54 * format.
  55 */
  56#define SND_SOC_DAIFMT_NB_NF            (1 << 8) /* normal bit clock + frame */
  57#define SND_SOC_DAIFMT_NB_IF            (2 << 8) /* normal BCLK + inv FRM */
  58#define SND_SOC_DAIFMT_IB_NF            (3 << 8) /* invert BCLK + nor FRM */
  59#define SND_SOC_DAIFMT_IB_IF            (4 << 8) /* invert BCLK + FRM */
  60
  61/*
  62 * DAI hardware clock masters.
  63 *
  64 * This is wrt the codec, the inverse is true for the interface
  65 * i.e. if the codec is clk and FRM master then the interface is
  66 * clk and frame slave.
  67 */
  68#define SND_SOC_DAIFMT_CBM_CFM          (1 << 12) /* codec clk & FRM master */
  69#define SND_SOC_DAIFMT_CBS_CFM          (2 << 12) /* codec clk slave & FRM master */
  70#define SND_SOC_DAIFMT_CBM_CFS          (3 << 12) /* codec clk master & frame slave */
  71#define SND_SOC_DAIFMT_CBS_CFS          (4 << 12) /* codec clk & FRM slave */
  72
  73#define SND_SOC_DAIFMT_FORMAT_MASK      0x000f
  74#define SND_SOC_DAIFMT_CLOCK_MASK       0x00f0
  75#define SND_SOC_DAIFMT_INV_MASK         0x0f00
  76#define SND_SOC_DAIFMT_MASTER_MASK      0xf000
  77
  78/*
  79 * Master Clock Directions
  80 */
  81#define SND_SOC_CLOCK_IN                0
  82#define SND_SOC_CLOCK_OUT               1
  83
  84#define SND_SOC_STD_AC97_FMTS (SNDRV_PCM_FMTBIT_S8 |\
  85                               SNDRV_PCM_FMTBIT_S16_LE |\
  86                               SNDRV_PCM_FMTBIT_S16_BE |\
  87                               SNDRV_PCM_FMTBIT_S20_3LE |\
  88                               SNDRV_PCM_FMTBIT_S20_3BE |\
  89                               SNDRV_PCM_FMTBIT_S24_3LE |\
  90                               SNDRV_PCM_FMTBIT_S24_3BE |\
  91                               SNDRV_PCM_FMTBIT_S32_LE |\
  92                               SNDRV_PCM_FMTBIT_S32_BE)
  93
  94struct snd_soc_dai_driver;
  95struct snd_soc_dai;
  96struct snd_ac97_bus_ops;
  97
  98/* Digital Audio Interface registration */
  99int snd_soc_register_dai(struct device *dev,
 100                struct snd_soc_dai_driver *dai_drv);
 101void snd_soc_unregister_dai(struct device *dev);
 102int snd_soc_register_dais(struct device *dev,
 103                struct snd_soc_dai_driver *dai_drv, size_t count);
 104void snd_soc_unregister_dais(struct device *dev, size_t count);
 105
 106/* Digital Audio Interface clocking API.*/
 107int snd_soc_dai_set_sysclk(struct snd_soc_dai *dai, int clk_id,
 108        unsigned int freq, int dir);
 109
 110int snd_soc_dai_set_clkdiv(struct snd_soc_dai *dai,
 111        int div_id, int div);
 112
 113int snd_soc_dai_set_pll(struct snd_soc_dai *dai,
 114        int pll_id, int source, unsigned int freq_in, unsigned int freq_out);
 115
 116/* Digital Audio interface formatting */
 117int snd_soc_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt);
 118
 119int snd_soc_dai_set_tdm_slot(struct snd_soc_dai *dai,
 120        unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width);
 121
 122int snd_soc_dai_set_channel_map(struct snd_soc_dai *dai,
 123        unsigned int tx_num, unsigned int *tx_slot,
 124        unsigned int rx_num, unsigned int *rx_slot);
 125
 126int snd_soc_dai_set_tristate(struct snd_soc_dai *dai, int tristate);
 127
 128/* Digital Audio Interface mute */
 129int snd_soc_dai_digital_mute(struct snd_soc_dai *dai, int mute);
 130
 131struct snd_soc_dai_ops {
 132        /*
 133         * DAI clocking configuration, all optional.
 134         * Called by soc_card drivers, normally in their hw_params.
 135         */
 136        int (*set_sysclk)(struct snd_soc_dai *dai,
 137                int clk_id, unsigned int freq, int dir);
 138        int (*set_pll)(struct snd_soc_dai *dai, int pll_id, int source,
 139                unsigned int freq_in, unsigned int freq_out);
 140        int (*set_clkdiv)(struct snd_soc_dai *dai, int div_id, int div);
 141
 142        /*
 143         * DAI format configuration
 144         * Called by soc_card drivers, normally in their hw_params.
 145         */
 146        int (*set_fmt)(struct snd_soc_dai *dai, unsigned int fmt);
 147        int (*set_tdm_slot)(struct snd_soc_dai *dai,
 148                unsigned int tx_mask, unsigned int rx_mask,
 149                int slots, int slot_width);
 150        int (*set_channel_map)(struct snd_soc_dai *dai,
 151                unsigned int tx_num, unsigned int *tx_slot,
 152                unsigned int rx_num, unsigned int *rx_slot);
 153        int (*set_tristate)(struct snd_soc_dai *dai, int tristate);
 154
 155        /*
 156         * DAI digital mute - optional.
 157         * Called by soc-core to minimise any pops.
 158         */
 159        int (*digital_mute)(struct snd_soc_dai *dai, int mute);
 160
 161        /*
 162         * ALSA PCM audio operations - all optional.
 163         * Called by soc-core during audio PCM operations.
 164         */
 165        int (*startup)(struct snd_pcm_substream *,
 166                struct snd_soc_dai *);
 167        void (*shutdown)(struct snd_pcm_substream *,
 168                struct snd_soc_dai *);
 169        int (*hw_params)(struct snd_pcm_substream *,
 170                struct snd_pcm_hw_params *, struct snd_soc_dai *);
 171        int (*hw_free)(struct snd_pcm_substream *,
 172                struct snd_soc_dai *);
 173        int (*prepare)(struct snd_pcm_substream *,
 174                struct snd_soc_dai *);
 175        int (*trigger)(struct snd_pcm_substream *, int,
 176                struct snd_soc_dai *);
 177        int (*bespoke_trigger)(struct snd_pcm_substream *, int,
 178                struct snd_soc_dai *);
 179        /*
 180         * For hardware based FIFO caused delay reporting.
 181         * Optional.
 182         */
 183        snd_pcm_sframes_t (*delay)(struct snd_pcm_substream *,
 184                struct snd_soc_dai *);
 185};
 186
 187/*
 188 * Digital Audio Interface Driver.
 189 *
 190 * Describes the Digital Audio Interface in terms of its ALSA, DAI and AC97
 191 * operations and capabilities. Codec and platform drivers will register this
 192 * structure for every DAI they have.
 193 *
 194 * This structure covers the clocking, formating and ALSA operations for each
 195 * interface.
 196 */
 197struct snd_soc_dai_driver {
 198        /* DAI description */
 199        const char *name;
 200        unsigned int id;
 201        int ac97_control;
 202        unsigned int base;
 203
 204        /* DAI driver callbacks */
 205        int (*probe)(struct snd_soc_dai *dai);
 206        int (*remove)(struct snd_soc_dai *dai);
 207        int (*suspend)(struct snd_soc_dai *dai);
 208        int (*resume)(struct snd_soc_dai *dai);
 209        /* compress dai */
 210        bool compress_dai;
 211
 212        /* ops */
 213        const struct snd_soc_dai_ops *ops;
 214
 215        /* DAI capabilities */
 216        struct snd_soc_pcm_stream capture;
 217        struct snd_soc_pcm_stream playback;
 218        unsigned int symmetric_rates:1;
 219
 220        /* probe ordering - for components with runtime dependencies */
 221        int probe_order;
 222        int remove_order;
 223};
 224
 225/*
 226 * Digital Audio Interface runtime data.
 227 *
 228 * Holds runtime data for a DAI.
 229 */
 230struct snd_soc_dai {
 231        const char *name;
 232        int id;
 233        struct device *dev;
 234        void *ac97_pdata;       /* platform_data for the ac97 codec */
 235
 236        /* driver ops */
 237        struct snd_soc_dai_driver *driver;
 238
 239        /* DAI runtime info */
 240        unsigned int capture_active:1;          /* stream is in use */
 241        unsigned int playback_active:1;         /* stream is in use */
 242        unsigned int symmetric_rates:1;
 243        struct snd_pcm_runtime *runtime;
 244        unsigned int active;
 245        unsigned char pop_wait:1;
 246        unsigned char probed:1;
 247
 248        struct snd_soc_dapm_widget *playback_widget;
 249        struct snd_soc_dapm_widget *capture_widget;
 250        struct snd_soc_dapm_context dapm;
 251
 252        /* DAI DMA data */
 253        void *playback_dma_data;
 254        void *capture_dma_data;
 255
 256        /* Symmetry data - only valid if symmetry is being enforced */
 257        unsigned int rate;
 258
 259        /* parent platform/codec */
 260        struct snd_soc_platform *platform;
 261        struct snd_soc_codec *codec;
 262
 263        struct snd_soc_card *card;
 264
 265        struct list_head list;
 266        struct list_head card_list;
 267};
 268
 269static inline void *snd_soc_dai_get_dma_data(const struct snd_soc_dai *dai,
 270                                             const struct snd_pcm_substream *ss)
 271{
 272        return (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 273                dai->playback_dma_data : dai->capture_dma_data;
 274}
 275
 276static inline void snd_soc_dai_set_dma_data(struct snd_soc_dai *dai,
 277                                            const struct snd_pcm_substream *ss,
 278                                            void *data)
 279{
 280        if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
 281                dai->playback_dma_data = data;
 282        else
 283                dai->capture_dma_data = data;
 284}
 285
 286static inline void snd_soc_dai_set_drvdata(struct snd_soc_dai *dai,
 287                void *data)
 288{
 289        dev_set_drvdata(dai->dev, data);
 290}
 291
 292static inline void *snd_soc_dai_get_drvdata(struct snd_soc_dai *dai)
 293{
 294        return dev_get_drvdata(dai->dev);
 295}
 296
 297#endif
 298
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