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 struct snd_usb_endpoint;
  34
  35 struct 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
  46 struct 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
 100 struct 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         struct snd_usb_endpoint *data_endpoint;
 123         struct snd_usb_endpoint *sync_endpoint;
 124         unsigned long flags;
 125
 126         u64 formats;                    /* format bitmasks (all or'ed) */
 127         unsigned int num_formats;               /* number of supported audio formats (list) */
 128         struct list_head fmt_list;      /* format list */
 129         struct snd_pcm_hw_constraint_list rate_list;    /* limited rates */
 130         spinlock_t lock;
 131
 132         int last_frame_number;          /* stored frame number */
 133         int last_delay;                 /* stored delay */
 134 };
 135
 136 struct snd_usb_stream {
 137         struct snd_usb_audio *chip;
 138         struct snd_pcm *pcm;
 139         int pcm_index;
 140         unsigned int fmt_type;          /* USB audio format type (1-3) */
 141         struct snd_usb_substream substream[2];
 142         struct list_head list;
 143 };
 144
 145 #endif /* __USBAUDIO_CARD_H */