linux/sound/usb/card.h
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   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
  11struct 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
  32struct snd_usb_substream;
  33struct snd_usb_endpoint;
  34
  35struct snd_urb_ctx {
  36        struct urb *urb;
  37        unsigned int buffer_size;       /* size of data buffer, if data URB */
  38        struct snd_usb_substream *subs;
  39        struct snd_usb_endpoint *ep;
  40        int index;      /* index for urb array */
  41        int packets;    /* number of packets per urb */
  42        int packet_size[MAX_PACKS_HS]; /* size of packets for next submission */
  43        struct list_head ready_list;
  44};
  45
  46struct snd_usb_endpoint {
  47        struct snd_usb_audio *chip;
  48
  49        int use_count;
  50        int ep_num;             /* the referenced endpoint number */
  51        int type;               /* SND_USB_ENDPOINT_TYPE_* */
  52        unsigned long flags;
  53
  54        void (*prepare_data_urb) (struct snd_usb_substream *subs,
  55                                  struct urb *urb);
  56        void (*retire_data_urb) (struct snd_usb_substream *subs,
  57                                 struct urb *urb);
  58
  59        struct snd_usb_substream *data_subs;
  60        struct snd_usb_endpoint *sync_master;
  61        struct snd_usb_endpoint *sync_slave;
  62
  63        struct snd_urb_ctx urb[MAX_URBS];
  64
  65        struct snd_usb_packet_info {
  66                uint32_t packet_size[MAX_PACKS_HS];
  67                int packets;
  68        } next_packet[MAX_URBS];
  69        int next_packet_read_pos, next_packet_write_pos;
  70        struct list_head ready_playback_urbs;
  71
  72        unsigned int nurbs;             /* # urbs */
  73        unsigned long active_mask;      /* bitmask of active urbs */
  74        unsigned long unlink_mask;      /* bitmask of unlinked urbs */
  75        char *syncbuf;                  /* sync buffer for all sync URBs */
  76        dma_addr_t sync_dma;            /* DMA address of syncbuf */
  77
  78        unsigned int pipe;              /* the data i/o pipe */
  79        unsigned int freqn;             /* nominal sampling rate in fs/fps in Q16.16 format */
  80        unsigned int freqm;             /* momentary sampling rate in fs/fps in Q16.16 format */
  81        int        freqshift;           /* how much to shift the feedback value to get Q16.16 */
  82        unsigned int freqmax;           /* maximum sampling rate, used for buffer management */
  83        unsigned int phase;             /* phase accumulator */
  84        unsigned int maxpacksize;       /* max packet size in bytes */
  85        unsigned int maxframesize;      /* max packet size in frames */
  86        unsigned int curpacksize;       /* current packet size in bytes (for capture) */
  87        unsigned int curframesize;      /* current packet size in frames (for capture) */
  88        unsigned int syncmaxsize;       /* sync endpoint packet size */
  89        unsigned int fill_max:1;        /* fill max packet size always */
  90        unsigned int datainterval;      /* log_2 of data packet interval */
  91        unsigned int syncinterval;      /* P for adaptive mode, 0 otherwise */
  92        unsigned char silence_value;
  93        unsigned int stride;
  94        int iface, alt_idx;
  95
  96        spinlock_t lock;
  97        struct list_head list;
  98};
  99
 100struct snd_usb_substream {
 101        struct snd_usb_stream *stream;
 102        struct usb_device *dev;
 103        struct snd_pcm_substream *pcm_substream;
 104        int direction;  /* playback or capture */
 105        int interface;  /* current interface */
 106        int endpoint;   /* assigned endpoint */
 107        struct audioformat *cur_audiofmt;       /* current audioformat pointer (for hw_params callback) */
 108        unsigned int cur_rate;          /* current rate (for hw_params callback) */
 109        unsigned int period_bytes;      /* current period bytes (for hw_params callback) */
 110        unsigned int altset_idx;     /* USB data format: index of alternate setting */
 111        unsigned int txfr_quirk:1;      /* allow sub-frame alignment */
 112        unsigned int fmt_type;          /* USB audio format type (1-3) */
 113
 114        unsigned int running: 1;        /* running status */
 115
 116        unsigned int hwptr_done;        /* processed byte position in the buffer */
 117        unsigned int transfer_done;             /* processed frames since last period update */
 118        unsigned long active_mask;      /* bitmask of active urbs */
 119        unsigned long unlink_mask;      /* bitmask of unlinked urbs */
 120
 121        /* data and sync endpoints for this stream */
 122        unsigned int ep_num;            /* the endpoint number */
 123        struct snd_usb_endpoint *data_endpoint;
 124        struct snd_usb_endpoint *sync_endpoint;
 125        unsigned long flags;
 126
 127        u64 formats;                    /* format bitmasks (all or'ed) */
 128        unsigned int num_formats;               /* number of supported audio formats (list) */
 129        struct list_head fmt_list;      /* format list */
 130        struct snd_pcm_hw_constraint_list rate_list;    /* limited rates */
 131        spinlock_t lock;
 132
 133        int last_frame_number;          /* stored frame number */
 134        int last_delay;                 /* stored delay */
 135};
 136
 137struct snd_usb_stream {
 138        struct snd_usb_audio *chip;
 139        struct snd_pcm *pcm;
 140        int pcm_index;
 141        unsigned int fmt_type;          /* USB audio format type (1-3) */
 142        struct snd_usb_substream substream[2];
 143        struct list_head list;
 144};
 145
 146#endif /* __USBAUDIO_CARD_H */
 147
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