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 #include <sound/soc.h>
  20
  21 struct snd_pcm_substream;
  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              0 /* I2S mode */
  30 #define SND_SOC_DAIFMT_RIGHT_J          1 /* Right Justified mode */
  31 #define SND_SOC_DAIFMT_LEFT_J           2 /* Left Justified mode */
  32 #define SND_SOC_DAIFMT_DSP_A            3 /* L data MSB after FRM LRC */
  33 #define SND_SOC_DAIFMT_DSP_B            4 /* L data MSB during FRM LRC */
  34 #define SND_SOC_DAIFMT_AC97             5 /* AC97 */
  35 #define SND_SOC_DAIFMT_PDM              6 /* 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             (0 << 4) /* continuous clock */
  48 #define SND_SOC_DAIFMT_GATED            (1 << 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            (0 << 8) /* normal bit clock + frame */
  57 #define SND_SOC_DAIFMT_NB_IF            (1 << 8) /* normal BCLK + inv FRM */
  58 #define SND_SOC_DAIFMT_IB_NF            (2 << 8) /* invert BCLK + nor FRM */
  59 #define SND_SOC_DAIFMT_IB_IF            (3 << 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          (0 << 12) /* codec clk & FRM master */
  69 #define SND_SOC_DAIFMT_CBS_CFM          (1 << 12) /* codec clk slave & FRM master */
  70 #define SND_SOC_DAIFMT_CBM_CFS          (2 << 12) /* codec clk master & frame slave */
  71 #define SND_SOC_DAIFMT_CBS_CFS          (3 << 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
  94 struct snd_soc_dai_driver;
  95 struct snd_soc_dai;
  96 struct snd_ac97_bus_ops;
  97
  98 /* Digital Audio Interface registration */
  99 int snd_soc_register_dai(struct device *dev,
 100                 struct snd_soc_dai_driver *dai_drv);
 101 void snd_soc_unregister_dai(struct device *dev);
 102 int snd_soc_register_dais(struct device *dev,
 103                 struct snd_soc_dai_driver *dai_drv, size_t count);
 104 void snd_soc_unregister_dais(struct device *dev, size_t count);
 105
 106 /* Digital Audio Interface clocking API.*/
 107 int snd_soc_dai_set_sysclk(struct snd_soc_dai *dai, int clk_id,
 108         unsigned int freq, int dir);
 109
 110 int snd_soc_dai_set_clkdiv(struct snd_soc_dai *dai,
 111         int div_id, int div);
 112
 113 int 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 */
 117 int snd_soc_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt);
 118
 119 int 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
 122 int 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
 126 int snd_soc_dai_set_tristate(struct snd_soc_dai *dai, int tristate);
 127
 128 /* Digital Audio Interface mute */
 129 int snd_soc_dai_digital_mute(struct snd_soc_dai *dai, int mute);
 130
 131 struct 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         /*
 178          * For hardware based FIFO caused delay reporting.
 179          * Optional.
 180          */
 181         snd_pcm_sframes_t (*delay)(struct snd_pcm_substream *,
 182                 struct snd_soc_dai *);
 183 };
 184
 185 /*
 186  * Digital Audio Interface Driver.
 187  *
 188  * Describes the Digital Audio Interface in terms of its ALSA, DAI and AC97
 189  * operations and capabilities. Codec and platform drivers will register this
 190  * structure for every DAI they have.
 191  *
 192  * This structure covers the clocking, formating and ALSA operations for each
 193  * interface.
 194  */
 195 struct snd_soc_dai_driver {
 196         /* DAI description */
 197         const char *name;
 198         unsigned int id;
 199         int ac97_control;
 200
 201         /* DAI driver callbacks */
 202         int (*probe)(struct snd_soc_dai *dai);
 203         int (*remove)(struct snd_soc_dai *dai);
 204         int (*suspend)(struct snd_soc_dai *dai);
 205         int (*resume)(struct snd_soc_dai *dai);
 206
 207         /* ops */
 208         struct snd_soc_dai_ops *ops;
 209
 210         /* DAI capabilities */
 211         struct snd_soc_pcm_stream capture;
 212         struct snd_soc_pcm_stream playback;
 213         unsigned int symmetric_rates:1;
 214 };
 215
 216 /*
 217  * Digital Audio Interface runtime data.
 218  *
 219  * Holds runtime data for a DAI.
 220  */
 221 struct snd_soc_dai {
 222         const char *name;
 223         int id;
 224         struct device *dev;
 225         void *ac97_pdata;       /* platform_data for the ac97 codec */
 226
 227         /* driver ops */
 228         struct snd_soc_dai_driver *driver;
 229
 230         /* DAI runtime info */
 231         unsigned int capture_active:1;          /* stream is in use */
 232         unsigned int playback_active:1;         /* stream is in use */
 233         unsigned int symmetric_rates:1;
 234         struct snd_pcm_runtime *runtime;
 235         unsigned int active;
 236         unsigned char pop_wait:1;
 237         unsigned char probed:1;
 238
 239         /* DAI DMA data */
 240         void *playback_dma_data;
 241         void *capture_dma_data;
 242
 243         /* parent platform/codec */
 244         union {
 245                 struct snd_soc_platform *platform;
 246                 struct snd_soc_codec *codec;
 247         };
 248         struct snd_soc_card *card;
 249
 250         struct list_head list;
 251         struct list_head card_list;
 252 };
 253
 254 static inline void *snd_soc_dai_get_dma_data(const struct snd_soc_dai *dai,
 255                                              const struct snd_pcm_substream *ss)
 256 {
 257         return (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 258                 dai->playback_dma_data : dai->capture_dma_data;
 259 }
 260
 261 static inline void snd_soc_dai_set_dma_data(struct snd_soc_dai *dai,
 262                                             const struct snd_pcm_substream *ss,
 263                                             void *data)
 264 {
 265         if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
 266                 dai->playback_dma_data = data;
 267         else
 268                 dai->capture_dma_data = data;
 269 }
 270
 271 static inline void snd_soc_dai_set_drvdata(struct snd_soc_dai *dai,
 272                 void *data)
 273 {
 274         dev_set_drvdata(dai->dev, data);
 275 }
 276
 277 static inline void *snd_soc_dai_get_drvdata(struct snd_soc_dai *dai)
 278 {
 279         return dev_get_drvdata(dai->dev);
 280 }
 281
 282 #endif