sound/usb/card.h

   1 #ifndef __USBAUDIO_CARD_H
   2 #define __USBAUDIO_CARD_H
   3
   4 #define MAX_NR_RATES    1024
   5 #define MAX_PACKS       20
   6 #define MAX_PACKS_HS    (MAX_PACKS * 8) /* in high speed mode */
   7 #define MAX_URBS        8
   8 #define SYNC_URBS       4       /* always four urbs for sync */
   9 #define MAX_QUEUE       24      /* try not to exceed this queue length, in ms */
  10
  11 struct audioformat {
  12         struct list_head list;
  13         u64 formats;                    /* ALSA format bits */
  14         unsigned int channels;          /* # channels */
  15         unsigned int fmt_type;          /* USB audio format type (1-3) */
  16         unsigned int frame_size;        /* samples per frame for non-audio */
  17         int iface;                      /* interface number */
  18         unsigned char altsetting;       /* corresponding alternate setting */
  19         unsigned char altset_idx;       /* array index of altenate setting */
  20         unsigned char attributes;       /* corresponding attributes of cs endpoint */
  21         unsigned char endpoint;         /* endpoint */
  22         unsigned char ep_attr;          /* endpoint attributes */
  23         unsigned char datainterval;     /* log_2 of data packet interval */
  24         unsigned int maxpacksize;       /* max. packet size */
  25         unsigned int rates;             /* rate bitmasks */
  26         unsigned int rate_min, rate_max;        /* min/max rates */
  27         unsigned int nr_rates;          /* number of rate table entries */
  28         unsigned int *rate_table;       /* rate table */
  29         unsigned char clock;            /* associated clock */
  30 };
  31
  32 struct snd_usb_substream;
  33
  34 struct snd_urb_ctx {
  35         struct urb *urb;
  36         unsigned int buffer_size;       /* size of data buffer, if data URB */
  37         struct snd_usb_substream *subs;
  38         int index;      /* index for urb array */
  39         int packets;    /* number of packets per urb */
  40 };
  41
  42 struct snd_urb_ops {
  43         int (*prepare)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
  44         int (*retire)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
  45         int (*prepare_sync)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
  46         int (*retire_sync)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
  47 };
  48
  49 struct snd_usb_substream {
  50         struct snd_usb_stream *stream;
  51         struct usb_device *dev;
  52         struct snd_pcm_substream *pcm_substream;
  53         int direction;  /* playback or capture */
  54         int interface;  /* current interface */
  55         int endpoint;   /* assigned endpoint */
  56         struct audioformat *cur_audiofmt;       /* current audioformat pointer (for hw_params callback) */
  57         unsigned int cur_rate;          /* current rate (for hw_params callback) */
  58         unsigned int period_bytes;      /* current period bytes (for hw_params callback) */
  59         unsigned int altset_idx;     /* USB data format: index of alternate setting */
  60         unsigned int datapipe;   /* the data i/o pipe */
  61         unsigned int syncpipe;   /* 1 - async out or adaptive in */
  62         unsigned int datainterval;      /* log_2 of data packet interval */
  63         unsigned int syncinterval;  /* P for adaptive mode, 0 otherwise */
  64         unsigned int freqn;      /* nominal sampling rate in fs/fps in Q16.16 format */
  65         unsigned int freqm;      /* momentary sampling rate in fs/fps in Q16.16 format */
  66         int          freqshift;  /* how much to shift the feedback value to get Q16.16 */
  67         unsigned int freqmax;    /* maximum sampling rate, used for buffer management */
  68         unsigned int phase;      /* phase accumulator */
  69         unsigned int maxpacksize;       /* max packet size in bytes */
  70         unsigned int maxframesize;      /* max packet size in frames */
  71         unsigned int curpacksize;       /* current packet size in bytes (for capture) */
  72         unsigned int curframesize;      /* current packet size in frames (for capture) */
  73         unsigned int syncmaxsize;       /* sync endpoint packet size */
  74         unsigned int fill_max: 1;       /* fill max packet size always */
  75         unsigned int txfr_quirk:1;      /* allow sub-frame alignment */
  76         unsigned int fmt_type;          /* USB audio format type (1-3) */
  77
  78         unsigned int running: 1;        /* running status */
  79
  80         unsigned int hwptr_done;        /* processed byte position in the buffer */
  81         unsigned int transfer_done;             /* processed frames since last period update */
  82         unsigned long active_mask;      /* bitmask of active urbs */
  83         unsigned long unlink_mask;      /* bitmask of unlinked urbs */
  84
  85         unsigned int nurbs;                     /* # urbs */
  86         struct snd_urb_ctx dataurb[MAX_URBS];   /* data urb table */
  87         struct snd_urb_ctx syncurb[SYNC_URBS];  /* sync urb table */
  88         char *syncbuf;                          /* sync buffer for all sync URBs */
  89         dma_addr_t sync_dma;                    /* DMA address of syncbuf */
  90
  91         u64 formats;                    /* format bitmasks (all or'ed) */
  92         unsigned int num_formats;               /* number of supported audio formats (list) */
  93         struct list_head fmt_list;      /* format list */
  94         struct snd_pcm_hw_constraint_list rate_list;    /* limited rates */
  95         spinlock_t lock;
  96
  97         struct snd_urb_ops ops;         /* callbacks (must be filled at init) */
  98         int last_frame_number;          /* stored frame number */
  99         int last_delay;                 /* stored delay */
 100 };
 101
 102 struct snd_usb_stream {
 103         struct snd_usb_audio *chip;
 104         struct snd_pcm *pcm;
 105         int pcm_index;
 106         unsigned int fmt_type;          /* USB audio format type (1-3) */
 107         struct snd_usb_substream substream[2];
 108         struct list_head list;
 109 };
 110
 111 #endif /* __USBAUDIO_CARD_H */