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18
19#define USB_STREAM_INTERFACE_VERSION 2
20
21#define SNDRV_USB_STREAM_IOCTL_SET_PARAMS \
22 _IOW('H', 0x90, struct usb_stream_config)
23
24struct usb_stream_packet {
25 unsigned offset;
26 unsigned length;
27};
28
29
30struct usb_stream_config {
31 unsigned version;
32 unsigned sample_rate;
33 unsigned period_frames;
34 unsigned frame_size;
35};
36
37struct usb_stream {
38 struct usb_stream_config cfg;
39 unsigned read_size;
40 unsigned write_size;
41
42 int period_size;
43
44 unsigned state;
45
46 int idle_insize;
47 int idle_outsize;
48 int sync_packet;
49 unsigned insize_done;
50 unsigned periods_done;
51 unsigned periods_polled;
52
53 struct usb_stream_packet outpacket[2];
54 unsigned inpackets;
55 unsigned inpacket_head;
56 unsigned inpacket_split;
57 unsigned inpacket_split_at;
58 unsigned next_inpacket_split;
59 unsigned next_inpacket_split_at;
60 struct usb_stream_packet inpacket[0];
61};
62
63enum usb_stream_state {
64 usb_stream_invalid,
65 usb_stream_stopped,
66 usb_stream_sync0,
67 usb_stream_sync1,
68 usb_stream_ready,
69 usb_stream_running,
70 usb_stream_xrun,
71};
72
73#if __KERNEL__
74
75#define USB_STREAM_NURBS 4
76#define USB_STREAM_URBDEPTH 4
77
78struct usb_stream_kernel {
79 struct usb_stream *s;
80
81 void *write_page;
82
83 unsigned n_o_ps;
84
85 struct urb *inurb[USB_STREAM_NURBS];
86 struct urb *idle_inurb;
87 struct urb *completed_inurb;
88 struct urb *outurb[USB_STREAM_NURBS];
89 struct urb *idle_outurb;
90 struct urb *completed_outurb;
91 struct urb *i_urb;
92
93 int iso_frame_balance;
94
95 wait_queue_head_t sleep;
96
97 unsigned out_phase;
98 unsigned out_phase_peeked;
99 unsigned freqn;
100};
101
102struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk,
103 struct usb_device *dev,
104 unsigned in_endpoint, unsigned out_endpoint,
105 unsigned sample_rate, unsigned use_packsize,
106 unsigned period_frames, unsigned frame_size);
107void usb_stream_free(struct usb_stream_kernel *);
108int usb_stream_start(struct usb_stream_kernel *);
109void usb_stream_stop(struct usb_stream_kernel *);
110
111
112#endif
113