1#ifndef __USBAUDIO_CARD_H
2#define __USBAUDIO_CARD_H
3
4#define MAX_PACKS	20
5#define MAX_PACKS_HS	(MAX_PACKS * 8)	/* in high speed mode */
6#define MAX_URBS	8
7#define SYNC_URBS	4	/* always four urbs for sync */
8#define MAX_QUEUE	24	/* try not to exceed this queue length, in ms */
9
10struct audioformat {
11	struct list_head list;
12	u64 formats;			/* ALSA format bits */
13	unsigned int channels;		/* # channels */
14	unsigned int fmt_type;		/* USB audio format type (1-3) */
15	unsigned int frame_size;	/* samples per frame for non-audio */
16	int iface;			/* interface number */
17	unsigned char altsetting;	/* corresponding alternate setting */
18	unsigned char altset_idx;	/* array index of altenate setting */
19	unsigned char attributes;	/* corresponding attributes of cs endpoint */
20	unsigned char endpoint;		/* endpoint */
21	unsigned char ep_attr;		/* endpoint attributes */
22	unsigned char datainterval;	/* log_2 of data packet interval */
23	unsigned int maxpacksize;	/* max. packet size */
24	unsigned int rates;		/* rate bitmasks */
25	unsigned int rate_min, rate_max;	/* min/max rates */
26	unsigned int nr_rates;		/* number of rate table entries */
27	unsigned int *rate_table;	/* rate table */
28	unsigned char clock;		/* associated clock */
29};
30
31struct snd_usb_substream;
32
33struct snd_urb_ctx {
34	struct urb *urb;
35	unsigned int buffer_size;	/* size of data buffer, if data URB */
36	struct snd_usb_substream *subs;
37	int index;	/* index for urb array */
38	int packets;	/* number of packets per urb */
39};
40
41struct snd_urb_ops {
42	int (*prepare)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
43	int (*retire)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
44	int (*prepare_sync)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
45	int (*retire_sync)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
46};
47
48struct snd_usb_substream {
49	struct snd_usb_stream *stream;
50	struct usb_device *dev;
51	struct snd_pcm_substream *pcm_substream;
52	int direction;	/* playback or capture */
53	int interface;	/* current interface */
54	int endpoint;	/* assigned endpoint */
55	struct audioformat *cur_audiofmt;	/* current audioformat pointer (for hw_params callback) */
56	unsigned int cur_rate;		/* current rate (for hw_params callback) */
57	unsigned int period_bytes;	/* current period bytes (for hw_params callback) */
58	unsigned int altset_idx;     /* USB data format: index of alternate setting */
59	unsigned int datapipe;   /* the data i/o pipe */
60	unsigned int syncpipe;   /* 1 - async out or adaptive in */
61	unsigned int datainterval;	/* log_2 of data packet interval */
62	unsigned int syncinterval;  /* P for adaptive mode, 0 otherwise */
63	unsigned int freqn;      /* nominal sampling rate in fs/fps in Q16.16 format */
64	unsigned int freqm;      /* momentary sampling rate in fs/fps in Q16.16 format */
65	unsigned int freqmax;    /* maximum sampling rate, used for buffer management */
66	unsigned int phase;      /* phase accumulator */
67	unsigned int maxpacksize;	/* max packet size in bytes */
68	unsigned int maxframesize;	/* max packet size in frames */
69	unsigned int curpacksize;	/* current packet size in bytes (for capture) */
70	unsigned int curframesize;	/* current packet size in frames (for capture) */
71	unsigned int fill_max: 1;	/* fill max packet size always */
72	unsigned int txfr_quirk:1;	/* allow sub-frame alignment */
73	unsigned int fmt_type;		/* USB audio format type (1-3) */
74
75	unsigned int running: 1;	/* running status */
76
77	unsigned int hwptr_done;	/* processed byte position in the buffer */
78	unsigned int transfer_done;		/* processed frames since last period update */
79	unsigned long active_mask;	/* bitmask of active urbs */
80	unsigned long unlink_mask;	/* bitmask of unlinked urbs */
81
82	unsigned int nurbs;			/* # urbs */
83	struct snd_urb_ctx dataurb[MAX_URBS];	/* data urb table */
84	struct snd_urb_ctx syncurb[SYNC_URBS];	/* sync urb table */
85	char *syncbuf;				/* sync buffer for all sync URBs */
86	dma_addr_t sync_dma;			/* DMA address of syncbuf */
87
88	u64 formats;			/* format bitmasks (all or'ed) */
89	unsigned int num_formats;		/* number of supported audio formats (list) */
90	struct list_head fmt_list;	/* format list */
91	struct snd_pcm_hw_constraint_list rate_list;	/* limited rates */
92	spinlock_t lock;
93
94	struct snd_urb_ops ops;		/* callbacks (must be filled at init) */
95};
96
97struct snd_usb_stream {
98	struct snd_usb_audio *chip;
99	struct snd_pcm *pcm;
100	int pcm_index;
101	unsigned int fmt_type;		/* USB audio format type (1-3) */
102	struct snd_usb_substream substream[2];
103	struct list_head list;
104};
105
106#endif /* __USBAUDIO_CARD_H */
107