include/sound/soc-dai.h - kernel/panda - Git at Google

 /*
  * 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;

 /*
  * 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)


 /*
  * DAI channels - for mapping to widgets.
  * Indexes correspond to WAV format for convenience.
  */
 #define SND_SOC_DAI_CHAN(chan)	(1 << chan)
 #define SND_SOC_DAI_CHAN_MASK(channels)	((1UL << channels) - 1)
 #define SND_SOC_DAI_CHAN_LEFT		(1 << 0)
 #define SND_SOC_DAI_CHAN_RIGHT		(1 << 1)
 #define SND_SOC_DAI_CHAN_STEREO	\
 	(SND_SOC_DAI_CHAN_LEFT | SND_SOC_DAI_CHAN_RIGHT)
 #define SND_SOC_DAI_CHAN_MONO	SND_SOC_DAI_CHAN_LEFT
 #define SND_SOC_DAI_CHAN_FRONT_LEFT		SND_SOC_DAI_CHAN_LEFT
 #define SND_SOC_DAI_CHAN_FRONT_RIGHT		SND_SOC_DAI_CHAN_RIGHT
 #define SND_SOC_DAI_CHAN_CENTER		(1 << 2)
 #define SND_SOC_DAI_CHAN_LFE		(1 << 3)
 #define SND_SOC_DAI_CHAN_BACK_LEFT	(1 << 4)
 #define SND_SOC_DAI_CHAN_BACK_RIGHT	(1 << 5)
 #define SND_SOC_DAI_CHAN_FRONT_LEFT_CENTER	(1 << 6)
 #define SND_SOC_DAI_CHAN_FRONT_RIGHT_CENTER	(1 << 7)
 #define SND_SOC_DAI_CHAN_BACK_CENTER	(1 << 8)
 #define SND_SOC_DAI_CHAN_SIDE_LEFT	(1 << 9)
 #define SND_SOC_DAI_CHAN_SIDE_RIGHT	(1 << 10)
 #define SND_SOC_DAI_CHAN_LEFT_HEIGHT	(1 << 12)
 #define SND_SOC_DAI_CHAN_RIGHT_HEIGHT	(1 << 14)

 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 *);
 };

 /*
  * Maps widgets to channels and DAIs.
  *
  * Used by the DAI driver to map connected widgets and supported channel
  * masks.
  *
  * Also can be used by the DAI device to configure the channel to widget
  * map at hw_params() prior to DAPM walk at prepare().
  *
  */
 struct snd_soc_dai_widget {
 	const char *name;
 	u32 channel_map;
 };

 /*
  * 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;

 	/* 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);

 	/* 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;

 	struct snd_soc_dai_widget *widgets;
 	int num_widgets;
 };

 /*
  * 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;

 	/* 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 */
 	union {
 		struct snd_soc_platform *platform;
 		struct snd_soc_codec *codec;
 	};
 	struct snd_soc_card *card;

 	struct list_head list;
 	struct list_head card_list;
 	struct snd_soc_dai_widget *widgets;
 };

 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);
 }

 /* Backend DAI PCM ops */
 static inline int snd_soc_dai_startup(struct snd_pcm_substream *substream,
 	struct snd_soc_dai *dai)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	int ret = 0;

 	mutex_lock(&rtd->pcm_mutex);

 	if (dai->driver->ops->startup)
 		ret = dai->driver->ops->startup(substream, dai);

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		dai->playback_active++;
 	else
 		dai->capture_active++;

 	dai->active++;

 	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }

 static inline void snd_soc_dai_shutdown(struct snd_pcm_substream *substream,
 	struct snd_soc_dai *dai)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;

 	mutex_lock(&rtd->pcm_mutex);

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		dai->playback_active--;
 	else
 		dai->capture_active--;

 	dai->active--;

 	if (dai->driver->ops->shutdown)
 		dai->driver->ops->shutdown(substream, dai);
 	mutex_unlock(&rtd->pcm_mutex);
 }

 static inline int snd_soc_dai_hw_params(struct snd_pcm_substream * substream,
 		struct snd_pcm_hw_params *hw_params, struct snd_soc_dai *dai)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	int ret = 0;

 	mutex_lock(&rtd->pcm_mutex);

 	if (dai->driver->ops->hw_params)
 		ret = dai->driver->ops->hw_params(substream, hw_params, dai);

 	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }

 static inline int snd_soc_dai_hw_free(struct snd_pcm_substream *substream,
 	struct snd_soc_dai *dai)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	int ret = 0;

 	mutex_lock(&rtd->pcm_mutex);

 	if (dai->driver->ops->hw_free)
 		ret = dai->driver->ops->hw_free(substream, dai);

 	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }

 static inline int snd_soc_dai_prepare(struct snd_pcm_substream *substream,
 	struct snd_soc_dai *dai)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	int ret = 0;

 	mutex_lock(&rtd->pcm_mutex);

 	if (dai->driver->ops->prepare)
 		ret = dai->driver->ops->prepare(substream, dai);

 	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }

 static inline int snd_soc_dai_trigger(struct snd_pcm_substream *substream,
 	int cmd, struct snd_soc_dai *dai)
 {
 	if (dai->driver->ops->trigger)
 		return dai->driver->ops->trigger(substream, cmd, dai);
 	return 0;
 }
 #endif
	/*
	* 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;

	/*
	* 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)


	/*
	* DAI channels - for mapping to widgets.
	* Indexes correspond to WAV format for convenience.
	*/
	#define SND_SOC_DAI_CHAN(chan) (1 << chan)
	#define SND_SOC_DAI_CHAN_MASK(channels) ((1UL << channels) - 1)
	#define SND_SOC_DAI_CHAN_LEFT (1 << 0)
	#define SND_SOC_DAI_CHAN_RIGHT (1 << 1)
	#define SND_SOC_DAI_CHAN_STEREO \
	(SND_SOC_DAI_CHAN_LEFT \| SND_SOC_DAI_CHAN_RIGHT)
	#define SND_SOC_DAI_CHAN_MONO SND_SOC_DAI_CHAN_LEFT
	#define SND_SOC_DAI_CHAN_FRONT_LEFT SND_SOC_DAI_CHAN_LEFT
	#define SND_SOC_DAI_CHAN_FRONT_RIGHT SND_SOC_DAI_CHAN_RIGHT
	#define SND_SOC_DAI_CHAN_CENTER (1 << 2)
	#define SND_SOC_DAI_CHAN_LFE (1 << 3)
	#define SND_SOC_DAI_CHAN_BACK_LEFT (1 << 4)
	#define SND_SOC_DAI_CHAN_BACK_RIGHT (1 << 5)
	#define SND_SOC_DAI_CHAN_FRONT_LEFT_CENTER (1 << 6)
	#define SND_SOC_DAI_CHAN_FRONT_RIGHT_CENTER (1 << 7)
	#define SND_SOC_DAI_CHAN_BACK_CENTER (1 << 8)
	#define SND_SOC_DAI_CHAN_SIDE_LEFT (1 << 9)
	#define SND_SOC_DAI_CHAN_SIDE_RIGHT (1 << 10)
	#define SND_SOC_DAI_CHAN_LEFT_HEIGHT (1 << 12)
	#define SND_SOC_DAI_CHAN_RIGHT_HEIGHT (1 << 14)

	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 *);
	};

	/*
	* Maps widgets to channels and DAIs.
	*
	* Used by the DAI driver to map connected widgets and supported channel
	* masks.
	*
	* Also can be used by the DAI device to configure the channel to widget
	* map at hw_params() prior to DAPM walk at prepare().
	*
	*/
	struct snd_soc_dai_widget {
	const char *name;
	u32 channel_map;
	};

	/*
	* 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;

	/* 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);

	/* 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;

	struct snd_soc_dai_widget *widgets;
	int num_widgets;
	};

	/*
	* 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;

	/* 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 */
	union {
	struct snd_soc_platform *platform;
	struct snd_soc_codec *codec;
	};
	struct snd_soc_card *card;

	struct list_head list;
	struct list_head card_list;
	struct snd_soc_dai_widget *widgets;
	};

	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);
	}

	/* Backend DAI PCM ops */
	static inline int snd_soc_dai_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	int ret = 0;

	mutex_lock(&rtd->pcm_mutex);

	if (dai->driver->ops->startup)
	ret = dai->driver->ops->startup(substream, dai);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	dai->playback_active++;
	else
	dai->capture_active++;

	dai->active++;

	mutex_unlock(&rtd->pcm_mutex);
	return ret;
	}

	static inline void snd_soc_dai_shutdown(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	mutex_lock(&rtd->pcm_mutex);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	dai->playback_active--;
	else
	dai->capture_active--;

	dai->active--;

	if (dai->driver->ops->shutdown)
	dai->driver->ops->shutdown(substream, dai);
	mutex_unlock(&rtd->pcm_mutex);
	}

	static inline int snd_soc_dai_hw_params(struct snd_pcm_substream * substream,
	struct snd_pcm_hw_params hw_params, struct snd_soc_dai dai)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	int ret = 0;

	mutex_lock(&rtd->pcm_mutex);

	if (dai->driver->ops->hw_params)
	ret = dai->driver->ops->hw_params(substream, hw_params, dai);

	mutex_unlock(&rtd->pcm_mutex);
	return ret;
	}

	static inline int snd_soc_dai_hw_free(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	int ret = 0;

	mutex_lock(&rtd->pcm_mutex);

	if (dai->driver->ops->hw_free)
	ret = dai->driver->ops->hw_free(substream, dai);

	mutex_unlock(&rtd->pcm_mutex);
	return ret;
	}

	static inline int snd_soc_dai_prepare(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	int ret = 0;

	mutex_lock(&rtd->pcm_mutex);

	if (dai->driver->ops->prepare)
	ret = dai->driver->ops->prepare(substream, dai);

	mutex_unlock(&rtd->pcm_mutex);
	return ret;
	}

	static inline int snd_soc_dai_trigger(struct snd_pcm_substream *substream,
	int cmd, struct snd_soc_dai *dai)
	{
	if (dai->driver->ops->trigger)
	return dai->driver->ops->trigger(substream, cmd, dai);
	return 0;
	}
	#endif