1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __USB_STREAM_H
3 #define __USB_STREAM_H
4 
5 #include <uapi/sound/usb_stream.h>
6 
7 #define USB_STREAM_NURBS 4
8 #define USB_STREAM_URBDEPTH 4
9 
10 struct usb_stream_kernel {
11 	struct usb_stream *s;
12 
13 	void *write_page;
14 
15 	unsigned n_o_ps;
16 
17 	struct urb *inurb[USB_STREAM_NURBS];
18 	struct urb *idle_inurb;
19 	struct urb *completed_inurb;
20 	struct urb *outurb[USB_STREAM_NURBS];
21 	struct urb *idle_outurb;
22 	struct urb *completed_outurb;
23 	struct urb *i_urb;
24 
25 	int iso_frame_balance;
26 
27 	wait_queue_head_t sleep;
28 
29 	unsigned out_phase;
30 	unsigned out_phase_peeked;
31 	unsigned freqn;
32 };
33 
34 struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk,
35 				  struct usb_device *dev,
36 				  unsigned in_endpoint, unsigned out_endpoint,
37 				  unsigned sample_rate, unsigned use_packsize,
38 				  unsigned period_frames, unsigned frame_size);
39 void usb_stream_free(struct usb_stream_kernel *);
40 int usb_stream_start(struct usb_stream_kernel *);
41 void usb_stream_stop(struct usb_stream_kernel *);
42 
43 #endif /* __USB_STREAM_H */
44