soc-dai.h

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/*
 * linux/sound/soc-dai.h -- ALSA SoC Layer
 *
 * Copyright:   2005-2008 Wolfson Microelectronics. PLC.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Digital Audio Interface (DAI) API.
 */

#ifndef __LINUX_SND_SOC_DAI_H
#define __LINUX_SND_SOC_DAI_H


#include <linux/list.h>

struct snd_pcm_substream;
struct snd_soc_dapm_widget;
struct snd_compr_stream;

/*
 * DAI hardware audio formats.
 *
 * Describes the physical PCM data formating and clocking. Add new formats
 * to the end.
 */
#define SND_SOC_DAIFMT_I2S      1 /* I2S mode */
#define SND_SOC_DAIFMT_RIGHT_J      2 /* Right Justified mode */
#define SND_SOC_DAIFMT_LEFT_J       3 /* Left Justified mode */
#define SND_SOC_DAIFMT_DSP_A        4 /* L data MSB after FRM LRC */
#define SND_SOC_DAIFMT_DSP_B        5 /* L data MSB during FRM LRC */
#define SND_SOC_DAIFMT_AC97     6 /* AC97 */
#define SND_SOC_DAIFMT_PDM      7 /* Pulse density modulation */

/* left and right justified also known as MSB and LSB respectively */
#define SND_SOC_DAIFMT_MSB      SND_SOC_DAIFMT_LEFT_J
#define SND_SOC_DAIFMT_LSB      SND_SOC_DAIFMT_RIGHT_J

/*
 * DAI Clock gating.
 *
 * DAI bit clocks can be be gated (disabled) when the DAI is not
 * sending or receiving PCM data in a frame. This can be used to save power.
 */
#define SND_SOC_DAIFMT_CONT     (1 << 4) /* continuous clock */
#define SND_SOC_DAIFMT_GATED        (2 << 4) /* clock is gated */

/*
 * DAI hardware signal inversions.
 *
 * Specifies whether the DAI can also support inverted clocks for the specified
 * format.
 */
#define SND_SOC_DAIFMT_NB_NF        (1 << 8) /* normal bit clock + frame */
#define SND_SOC_DAIFMT_NB_IF        (2 << 8) /* normal BCLK + inv FRM */
#define SND_SOC_DAIFMT_IB_NF        (3 << 8) /* invert BCLK + nor FRM */
#define SND_SOC_DAIFMT_IB_IF        (4 << 8) /* invert BCLK + FRM */

/*
 * DAI hardware clock masters.
 *
 * This is wrt the codec, the inverse is true for the interface
 * i.e. if the codec is clk and FRM master then the interface is
 * clk and frame slave.
 */
#define SND_SOC_DAIFMT_CBM_CFM      (1 << 12) /* codec clk & FRM master */
#define SND_SOC_DAIFMT_CBS_CFM      (2 << 12) /* codec clk slave & FRM master */
#define SND_SOC_DAIFMT_CBM_CFS      (3 << 12) /* codec clk master & frame slave */
#define SND_SOC_DAIFMT_CBS_CFS      (4 << 12) /* codec clk & FRM slave */

#define SND_SOC_DAIFMT_FORMAT_MASK  0x000f
#define SND_SOC_DAIFMT_CLOCK_MASK   0x00f0
#define SND_SOC_DAIFMT_INV_MASK     0x0f00
#define SND_SOC_DAIFMT_MASTER_MASK  0xf000

/*
 * Master Clock Directions
 */
#define SND_SOC_CLOCK_IN        0
#define SND_SOC_CLOCK_OUT       1

#define SND_SOC_STD_AC97_FMTS (SNDRV_PCM_FMTBIT_S8 |\
                   SNDRV_PCM_FMTBIT_S16_LE |\
                   SNDRV_PCM_FMTBIT_S16_BE |\
                   SNDRV_PCM_FMTBIT_S20_3LE |\
                   SNDRV_PCM_FMTBIT_S20_3BE |\
                   SNDRV_PCM_FMTBIT_S24_3LE |\
                   SNDRV_PCM_FMTBIT_S24_3BE |\
                               SNDRV_PCM_FMTBIT_S32_LE |\
                               SNDRV_PCM_FMTBIT_S32_BE)

struct snd_soc_dai_driver;
struct snd_soc_dai;
struct snd_ac97_bus_ops;

/* Digital Audio Interface registration */
int snd_soc_register_dai(struct device *dev,
        struct snd_soc_dai_driver *dai_drv);
void snd_soc_unregister_dai(struct device *dev);
int snd_soc_register_dais(struct device *dev,
        struct snd_soc_dai_driver *dai_drv, size_t count);
void snd_soc_unregister_dais(struct device *dev, size_t count);

/* Digital Audio Interface clocking API.*/
int snd_soc_dai_set_sysclk(struct snd_soc_dai *dai, int clk_id,
    unsigned int freq, int dir);

int snd_soc_dai_set_clkdiv(struct snd_soc_dai *dai,
    int div_id, int div);

int snd_soc_dai_set_pll(struct snd_soc_dai *dai,
    int pll_id, int source, unsigned int freq_in, unsigned int freq_out);

/* Digital Audio interface formatting */
int snd_soc_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt);

int snd_soc_dai_set_tdm_slot(struct snd_soc_dai *dai,
    unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width);

int snd_soc_dai_set_channel_map(struct snd_soc_dai *dai,
    unsigned int tx_num, unsigned int *tx_slot,
    unsigned int rx_num, unsigned int *rx_slot);

int snd_soc_dai_set_tristate(struct snd_soc_dai *dai, int tristate);

/* Digital Audio Interface mute */
int snd_soc_dai_digital_mute(struct snd_soc_dai *dai, int mute);

struct snd_soc_dai_ops {
    /*
     * DAI clocking configuration, all optional.
     * Called by soc_card drivers, normally in their hw_params.
     */
    int (*set_sysclk)(struct snd_soc_dai *dai,
        int clk_id, unsigned int freq, int dir);
    int (*set_pll)(struct snd_soc_dai *dai, int pll_id, int source,
        unsigned int freq_in, unsigned int freq_out);
    int (*set_clkdiv)(struct snd_soc_dai *dai, int div_id, int div);

    /*
     * DAI format configuration
     * Called by soc_card drivers, normally in their hw_params.
     */
    int (*set_fmt)(struct snd_soc_dai *dai, unsigned int fmt);
    int (*set_tdm_slot)(struct snd_soc_dai *dai,
        unsigned int tx_mask, unsigned int rx_mask,
        int slots, int slot_width);
    int (*set_channel_map)(struct snd_soc_dai *dai,
        unsigned int tx_num, unsigned int *tx_slot,
        unsigned int rx_num, unsigned int *rx_slot);
    int (*set_tristate)(struct snd_soc_dai *dai, int tristate);

    /*
     * DAI digital mute - optional.
     * Called by soc-core to minimise any pops.
     */
    int (*digital_mute)(struct snd_soc_dai *dai, int mute);

    /*
     * ALSA PCM audio operations - all optional.
     * Called by soc-core during audio PCM operations.
     */
    int (*startup)(struct snd_pcm_substream *,
        struct snd_soc_dai *);
    void (*shutdown)(struct snd_pcm_substream *,
        struct snd_soc_dai *);
    int (*hw_params)(struct snd_pcm_substream *,
        struct snd_pcm_hw_params *, struct snd_soc_dai *);
    int (*hw_free)(struct snd_pcm_substream *,
        struct snd_soc_dai *);
    int (*prepare)(struct snd_pcm_substream *,
        struct snd_soc_dai *);
    int (*trigger)(struct snd_pcm_substream *, int,
        struct snd_soc_dai *);
    int (*bespoke_trigger)(struct snd_pcm_substream *, int,
        struct snd_soc_dai *);
    /*
     * For hardware based FIFO caused delay reporting.
     * Optional.
     */
    snd_pcm_sframes_t (*delay)(struct snd_pcm_substream *,
        struct snd_soc_dai *);
};

/*
 * Digital Audio Interface Driver.
 *
 * Describes the Digital Audio Interface in terms of its ALSA, DAI and AC97
 * operations and capabilities. Codec and platform drivers will register this
 * structure for every DAI they have.
 *
 * This structure covers the clocking, formating and ALSA operations for each
 * interface.
 */
struct snd_soc_dai_driver {
    /* DAI description */
    const char *name;
    unsigned int id;
    int ac97_control;
    unsigned int base;

    /* DAI driver callbacks */
    int (*probe)(struct snd_soc_dai *dai);
    int (*remove)(struct snd_soc_dai *dai);
    int (*suspend)(struct snd_soc_dai *dai);
    int (*resume)(struct snd_soc_dai *dai);
    /* compress dai */
    bool compress_dai;

    /* ops */
    const struct snd_soc_dai_ops *ops;

    /* DAI capabilities */
    struct snd_soc_pcm_stream capture;
    struct snd_soc_pcm_stream playback;
    unsigned int symmetric_rates:1;

    /* probe ordering - for components with runtime dependencies */
    int probe_order;
    int remove_order;
};

/*
 * Digital Audio Interface runtime data.
 *
 * Holds runtime data for a DAI.
 */
struct snd_soc_dai {
    const char *name;
    int id;
    struct device *dev;
    void *ac97_pdata;   /* platform_data for the ac97 codec */

    /* driver ops */
    struct snd_soc_dai_driver *driver;

    /* DAI runtime info */
    unsigned int capture_active:1;      /* stream is in use */
    unsigned int playback_active:1;     /* stream is in use */
    unsigned int symmetric_rates:1;
    struct snd_pcm_runtime *runtime;
    unsigned int active;
    unsigned char pop_wait:1;
    unsigned char probed:1;

    struct snd_soc_dapm_widget *playback_widget;
    struct snd_soc_dapm_widget *capture_widget;
    struct snd_soc_dapm_context dapm;

    /* DAI DMA data */
    void *playback_dma_data;
    void *capture_dma_data;

    /* Symmetry data - only valid if symmetry is being enforced */
    unsigned int rate;

    /* parent platform/codec */
    struct snd_soc_platform *platform;
    struct snd_soc_codec *codec;

    struct snd_soc_card *card;

    struct list_head list;
    struct list_head card_list;
};

static inline void *snd_soc_dai_get_dma_data(const struct snd_soc_dai *dai,
                         const struct snd_pcm_substream *ss)
{
    return (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
        dai->playback_dma_data : dai->capture_dma_data;
}

static inline void snd_soc_dai_set_dma_data(struct snd_soc_dai *dai,
                        const struct snd_pcm_substream *ss,
                        void *data)
{
    if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
        dai->playback_dma_data = data;
    else
        dai->capture_dma_data = data;
}

static inline void snd_soc_dai_set_drvdata(struct snd_soc_dai *dai,
        void *data)
{
    dev_set_drvdata(dai->dev, data);
}

static inline void *snd_soc_dai_get_drvdata(struct snd_soc_dai *dai)
{
    return dev_get_drvdata(dai->dev);
}

#endif