xref: /linux/drivers/media/usb/pvrusb2/pvrusb2-io.h (revision 75bf465f0bc33e9b776a46d6a1b9b990f5fb7c37)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  *
4  *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
5  */
6 #ifndef __PVRUSB2_IO_H
7 #define __PVRUSB2_IO_H
8 
9 #include <linux/usb.h>
10 #include <linux/list.h>
11 
12 typedef void (*pvr2_stream_callback)(void *);
13 
14 enum pvr2_buffer_state {
15 	pvr2_buffer_state_none = 0,   // Not on any list
16 	pvr2_buffer_state_idle = 1,   // Buffer is ready to be used again
17 	pvr2_buffer_state_queued = 2, // Buffer has been queued for filling
18 	pvr2_buffer_state_ready = 3,  // Buffer has data available
19 };
20 
21 struct pvr2_stream;
22 struct pvr2_buffer;
23 
24 struct pvr2_stream_stats {
25 	unsigned int buffers_in_queue;
26 	unsigned int buffers_in_idle;
27 	unsigned int buffers_in_ready;
28 	unsigned int buffers_processed;
29 	unsigned int buffers_failed;
30 	unsigned int bytes_processed;
31 };
32 
33 /* Initialize / tear down stream structure */
34 struct pvr2_stream *pvr2_stream_create(void);
35 void pvr2_stream_destroy(struct pvr2_stream *);
36 void pvr2_stream_setup(struct pvr2_stream *,
37 		       struct usb_device *dev,int endpoint,
38 		       unsigned int tolerance);
39 void pvr2_stream_set_callback(struct pvr2_stream *,
40 			      pvr2_stream_callback func,
41 			      void *data);
42 void pvr2_stream_get_stats(struct pvr2_stream *,
43 			   struct pvr2_stream_stats *,
44 			   int zero_counts);
45 
46 /* Query / set the nominal buffer count */
47 int pvr2_stream_get_buffer_count(struct pvr2_stream *);
48 int pvr2_stream_set_buffer_count(struct pvr2_stream *,unsigned int);
49 
50 /* Get a pointer to a buffer that is either idle, ready, or is specified
51    named. */
52 struct pvr2_buffer *pvr2_stream_get_idle_buffer(struct pvr2_stream *);
53 struct pvr2_buffer *pvr2_stream_get_ready_buffer(struct pvr2_stream *);
54 struct pvr2_buffer *pvr2_stream_get_buffer(struct pvr2_stream *sp,int id);
55 
56 /* Find out how many buffers are idle or ready */
57 int pvr2_stream_get_ready_count(struct pvr2_stream *);
58 
59 
60 /* Kill all pending buffers and throw away any ready buffers as well */
61 void pvr2_stream_kill(struct pvr2_stream *);
62 
63 /* Set up the actual storage for a buffer */
64 int pvr2_buffer_set_buffer(struct pvr2_buffer *,void *ptr,unsigned int cnt);
65 
66 /* Find out size of data in the given ready buffer */
67 unsigned int pvr2_buffer_get_count(struct pvr2_buffer *);
68 
69 /* Retrieve completion code for given ready buffer */
70 int pvr2_buffer_get_status(struct pvr2_buffer *);
71 
72 /* Retrieve ID of given buffer */
73 int pvr2_buffer_get_id(struct pvr2_buffer *);
74 
75 /* Start reading into given buffer (kill it if needed) */
76 int pvr2_buffer_queue(struct pvr2_buffer *);
77 
78 #endif /* __PVRUSB2_IO_H */
79