Merge branch 'stmp' into devel
[linux-2.6] / sound / usb / usx2y / usb_stream.h
1 /*
2  * Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de>
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms of the GNU General Public License as published by the
6  * Free Software Foundation; either version 2 of the License, or (at your
7  * option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful, but
10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software Foundation,
16  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17  */
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
24 struct usb_stream_packet {
25         unsigned offset;
26         unsigned length;
27 };
28
29
30 struct usb_stream_config {
31         unsigned version;
32         unsigned sample_rate;
33         unsigned period_frames;
34         unsigned frame_size;
35 };
36
37 struct 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
63 enum 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
78 struct 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
102 struct 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);
107 void usb_stream_free(struct usb_stream_kernel *);
108 int usb_stream_start(struct usb_stream_kernel *);
109 void usb_stream_stop(struct usb_stream_kernel *);
110
111
112 #endif