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 */ 112