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       6               /* per URB */
   6#define MAX_PACKS_HS    (MAX_PACKS * 8) /* in high speed mode */
   7#define MAX_URBS        12
   8#define SYNC_URBS       4       /* always four urbs for sync */
   9#define MAX_QUEUE       18      /* 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 char protocol;         /* UAC_VERSION_1/2 */
  25        unsigned int maxpacksize;       /* max. packet size */
  26        unsigned int rates;             /* rate bitmasks */
  27        unsigned int rate_min, rate_max;        /* min/max rates */
  28        unsigned int nr_rates;          /* number of rate table entries */
  29        unsigned int *rate_table;       /* rate table */
  30        unsigned char clock;            /* associated clock */
  31        struct snd_pcm_chmap_elem *chmap; /* (optional) channel map */
  32        bool dsd_dop;                   /* add DOP headers in case of DSD samples */
  33        bool dsd_bitrev;                /* reverse the bits of each DSD sample */
  34};
  35
  36struct snd_usb_substream;
  37struct snd_usb_endpoint;
  38
  39struct snd_urb_ctx {
  40        struct urb *urb;
  41        unsigned int buffer_size;       /* size of data buffer, if data URB */
  42        struct snd_usb_substream *subs;
  43        struct snd_usb_endpoint *ep;
  44        int index;      /* index for urb array */
  45        int packets;    /* number of packets per urb */
  46        int packet_size[MAX_PACKS_HS]; /* size of packets for next submission */
  47        struct list_head ready_list;
  48};
  49
  50struct snd_usb_endpoint {
  51        struct snd_usb_audio *chip;
  52
  53        int use_count;
  54        int ep_num;             /* the referenced endpoint number */
  55        int type;               /* SND_USB_ENDPOINT_TYPE_* */
  56        unsigned long flags;
  57
  58        void (*prepare_data_urb) (struct snd_usb_substream *subs,
  59                                  struct urb *urb);
  60        void (*retire_data_urb) (struct snd_usb_substream *subs,
  61                                 struct urb *urb);
  62
  63        struct snd_usb_substream *data_subs;
  64        struct snd_usb_endpoint *sync_master;
  65        struct snd_usb_endpoint *sync_slave;
  66
  67        struct snd_urb_ctx urb[MAX_URBS];
  68
  69        struct snd_usb_packet_info {
  70                uint32_t packet_size[MAX_PACKS_HS];
  71                int packets;
  72        } next_packet[MAX_URBS];
  73        int next_packet_read_pos, next_packet_write_pos;
  74        struct list_head ready_playback_urbs;
  75
  76        unsigned int nurbs;             /* # urbs */
  77        unsigned long active_mask;      /* bitmask of active urbs */
  78        unsigned long unlink_mask;      /* bitmask of unlinked urbs */
  79        char *syncbuf;                  /* sync buffer for all sync URBs */
  80        dma_addr_t sync_dma;            /* DMA address of syncbuf */
  81
  82        unsigned int pipe;              /* the data i/o pipe */
  83        unsigned int freqn;             /* nominal sampling rate in fs/fps in Q16.16 format */
  84        unsigned int freqm;             /* momentary sampling rate in fs/fps in Q16.16 format */
  85        int        freqshift;           /* how much to shift the feedback value to get Q16.16 */
  86        unsigned int freqmax;           /* maximum sampling rate, used for buffer management */
  87        unsigned int phase;             /* phase accumulator */
  88        unsigned int maxpacksize;       /* max packet size in bytes */
  89        unsigned int maxframesize;      /* max packet size in frames */
  90        unsigned int max_urb_frames;    /* max URB size in frames */
  91        unsigned int curpacksize;       /* current packet size in bytes (for capture) */
  92        unsigned int curframesize;      /* current packet size in frames (for capture) */
  93        unsigned int syncmaxsize;       /* sync endpoint packet size */
  94        unsigned int fill_max:1;        /* fill max packet size always */
  95        unsigned int tenor_fb_quirk:1;  /* corrupted feedback data */
  96        unsigned int datainterval;      /* log_2 of data packet interval */
  97        unsigned int syncinterval;      /* P for adaptive mode, 0 otherwise */
  98        unsigned char silence_value;
  99        unsigned int stride;
 100        int iface, altsetting;
 101        int skip_packets;               /* quirks for devices to ignore the first n packets
 102                                           in a stream */
 103
 104        spinlock_t lock;
 105        struct list_head list;
 106};
 107
 108struct snd_usb_substream {
 109        struct snd_usb_stream *stream;
 110        struct usb_device *dev;
 111        struct snd_pcm_substream *pcm_substream;
 112        int direction;  /* playback or capture */
 113        int interface;  /* current interface */
 114        int endpoint;   /* assigned endpoint */
 115        struct audioformat *cur_audiofmt;       /* current audioformat pointer (for hw_params callback) */
 116        snd_pcm_format_t pcm_format;    /* current audio format (for hw_params callback) */
 117        unsigned int channels;          /* current number of channels (for hw_params callback) */
 118        unsigned int channels_max;      /* max channels in the all audiofmts */
 119        unsigned int cur_rate;          /* current rate (for hw_params callback) */
 120        unsigned int period_bytes;      /* current period bytes (for hw_params callback) */
 121        unsigned int period_frames;     /* current frames per period */
 122        unsigned int buffer_periods;    /* current periods per buffer */
 123        unsigned int altset_idx;     /* USB data format: index of alternate setting */
 124        unsigned int txfr_quirk:1;      /* allow sub-frame alignment */
 125        unsigned int tx_length_quirk:1; /* add length specifier to transfers */
 126        unsigned int fmt_type;          /* USB audio format type (1-3) */
 127        unsigned int pkt_offset_adj;    /* Bytes to drop from beginning of packets (for non-compliant devices) */
 128
 129        unsigned int running: 1;        /* running status */
 130
 131        unsigned int hwptr_done;        /* processed byte position in the buffer */
 132        unsigned int transfer_done;             /* processed frames since last period update */
 133        unsigned int frame_limit;       /* limits number of packets in URB */
 134
 135        /* data and sync endpoints for this stream */
 136        unsigned int ep_num;            /* the endpoint number */
 137        struct snd_usb_endpoint *data_endpoint;
 138        struct snd_usb_endpoint *sync_endpoint;
 139        unsigned long flags;
 140        bool need_setup_ep;             /* (re)configure EP at prepare? */
 141        unsigned int speed;             /* USB_SPEED_XXX */
 142
 143        u64 formats;                    /* format bitmasks (all or'ed) */
 144        unsigned int num_formats;               /* number of supported audio formats (list) */
 145        struct list_head fmt_list;      /* format list */
 146        struct snd_pcm_hw_constraint_list rate_list;    /* limited rates */
 147        spinlock_t lock;
 148
 149        int last_frame_number;          /* stored frame number */
 150        int last_delay;                 /* stored delay */
 151
 152        struct {
 153                int marker;
 154                int channel;
 155                int byte_idx;
 156        } dsd_dop;
 157
 158        bool trigger_tstamp_pending_update; /* trigger timestamp being updated from initial estimate */
 159};
 160
 161struct snd_usb_stream {
 162        struct snd_usb_audio *chip;
 163        struct snd_pcm *pcm;
 164        int pcm_index;
 165        unsigned int fmt_type;          /* USB audio format type (1-3) */
 166        struct snd_usb_substream substream[2];
 167        struct list_head list;
 168};
 169
 170#endif /* __USBAUDIO_CARD_H */
 171