sound/usb/card.h

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