1 #ifndef __USBAUDIO_CARD_H
2 #define __USBAUDIO_CARD_H
4 #define MAX_NR_RATES 1024
6 #define MAX_PACKS_HS (MAX_PACKS * 8) /* in high speed mode */
8 #define SYNC_URBS 4 /* always four urbs for sync */
9 #define MAX_QUEUE 24 /* try not to exceed this queue length, in ms */
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 */
32 struct snd_usb_substream
;
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 */
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
);
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) */
78 unsigned int running
: 1; /* running status */
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 */
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 */
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 */
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 */
102 struct snd_usb_stream
{
103 struct snd_usb_audio
*chip
;
106 unsigned int fmt_type
; /* USB audio format type (1-3) */
107 struct snd_usb_substream substream
[2];
108 struct list_head list
;
111 #endif /* __USBAUDIO_CARD_H */