mxc-pcm.h

根据芯片WM8782在LINUX环境下实现的音频驱动

/*
*
* mxc-pcm.h
*
*/

#ifndef __MXC_PCM_H__
#define __MXC_PCM_H__


typedef struct audio_stream{
	char* id;
	int stream_id;

	int dma_channel;

	//we are using this stream for transfer now
	int active;

	 // are we recording - flag used to do DMA trans. for sync
	int tx_spin;

	 //for locking in DMA operations
	spinlock_t dma_lock;
 
	//int mode;
	int period;		/* Index of current period */
	int periods;		/* Number of periods buffered to DMA */

//	unsigned int old_offset;
	snd_pcm_substream_t* substream;
}audio_stream_t;

typedef struct mx27_codec_t{
	struct snd_card* card;
	struct snd_pcm *pcm;
	audio_stream_t s[2];	/* capture */
	struct wm8782_platform_data * pdata;
}mx27_codec_t;

#endif