1 /*
2  * Copyright (c) 2013 Lubomir Rintel
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions, and the following disclaimer,
10  *    without modification.
11  * 2. The name of the author may not be used to endorse or promote products
12  *    derived from this software without specific prior written permission.
13  *
14  * Alternatively, this software may be distributed under the terms of the
15  * GNU General Public License ("GPL").
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  */
29 /*
30  * Fushicai USBTV007 Audio-Video Grabber Driver
31  *
32  * No physical hardware was harmed running Windows during the
33  * reverse-engineering activity
34  */
35 
36 #include <linux/module.h>
37 #include <linux/slab.h>
38 #include <linux/usb.h>
39 
40 #include <media/v4l2-device.h>
41 #include <media/v4l2-ctrls.h>
42 #include <media/videobuf2-v4l2.h>
43 #include <media/videobuf2-vmalloc.h>
44 
45 /* Hardware. */
46 #define USBTV_VIDEO_ENDP	0x81
47 #define USBTV_AUDIO_ENDP	0x83
48 #define USBTV_BASE		0xc000
49 #define USBTV_CONTROL_REG	11
50 #define USBTV_REQUEST_REG	12
51 
52 /* Number of concurrent isochronous urbs submitted.
53  * Higher numbers was seen to overly saturate the USB bus. */
54 #define USBTV_ISOC_TRANSFERS	16
55 #define USBTV_ISOC_PACKETS	8
56 
57 #define USBTV_CHUNK_SIZE	256
58 #define USBTV_CHUNK		240
59 
60 #define USBTV_AUDIO_URBSIZE	20480
61 #define USBTV_AUDIO_HDRSIZE	4
62 #define USBTV_AUDIO_BUFFER	65536
63 
64 /* Chunk header. */
65 #define USBTV_MAGIC_OK(chunk)	((be32_to_cpu(chunk[0]) & 0xff000000) \
66 							== 0x88000000)
67 #define USBTV_FRAME_ID(chunk)	((be32_to_cpu(chunk[0]) & 0x00ff0000) >> 16)
68 #define USBTV_ODD(chunk)	((be32_to_cpu(chunk[0]) & 0x0000f000) >> 15)
69 #define USBTV_CHUNK_NO(chunk)	(be32_to_cpu(chunk[0]) & 0x00000fff)
70 
71 #define USBTV_TV_STD		(V4L2_STD_525_60 | V4L2_STD_PAL | \
72 				 V4L2_STD_PAL_Nc | V4L2_STD_SECAM)
73 
74 /* parameters for supported TV norms */
75 struct usbtv_norm_params {
76 	v4l2_std_id norm;
77 	int cap_width, cap_height;
78 };
79 
80 /* A single videobuf2 frame buffer. */
81 struct usbtv_buf {
82 	struct vb2_v4l2_buffer vb;
83 	struct list_head list;
84 };
85 
86 /* Per-device structure. */
87 struct usbtv {
88 	struct device *dev;
89 	struct usb_device *udev;
90 
91 	/* video */
92 	struct v4l2_device v4l2_dev;
93 	struct v4l2_ctrl_handler ctrl;
94 	struct video_device vdev;
95 	struct vb2_queue vb2q;
96 	struct mutex v4l2_lock;
97 	struct mutex vb2q_lock;
98 
99 	/* List of videobuf2 buffers protected by a lock. */
100 	spinlock_t buflock;
101 	struct list_head bufs;
102 
103 	/* Number of currently processed frame, useful find
104 	 * out when a new one begins. */
105 	u32 frame_id;
106 	int chunks_done;
107 
108 	enum {
109 		USBTV_COMPOSITE_INPUT,
110 		USBTV_SVIDEO_INPUT,
111 	} input;
112 	v4l2_std_id norm;
113 	int width, height;
114 	int n_chunks;
115 	int iso_size;
116 	int last_odd;
117 	unsigned int sequence;
118 	struct urb *isoc_urbs[USBTV_ISOC_TRANSFERS];
119 
120 	/* audio */
121 	struct snd_card *snd;
122 	struct snd_pcm_substream *snd_substream;
123 	atomic_t snd_stream;
124 	struct work_struct snd_trigger;
125 	struct urb *snd_bulk_urb;
126 	size_t snd_buffer_pos;
127 	size_t snd_period_pos;
128 };
129 
130 int usbtv_set_regs(struct usbtv *usbtv, const u16 regs[][2], int size);
131 
132 int usbtv_video_init(struct usbtv *usbtv);
133 void usbtv_video_free(struct usbtv *usbtv);
134 
135 int usbtv_audio_init(struct usbtv *usbtv);
136 void usbtv_audio_free(struct usbtv *usbtv);
137 void usbtv_audio_suspend(struct usbtv *usbtv);
138 void usbtv_audio_resume(struct usbtv *usbtv);
139