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[mirror_ubuntu-zesty-kernel.git] / drivers / media / usb / usbtv / usbtv.c
CommitLineData
f3d27f34
LR		 1/*
2 * Fushicai USBTV007 Video Grabber Driver
3 *
4 * Product web site:
5 * http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html
6 *
7 * Following LWN articles were very useful in construction of this driver:
8 * Video4Linux2 API series: http://lwn.net/Articles/203924/
9 * videobuf2 API explanation: http://lwn.net/Articles/447435/
10 * Thanks go to Jonathan Corbet for providing this quality documentation.
11 * He is awesome.
12 *
13 * Copyright (c) 2013 Lubomir Rintel
14 * All rights reserved.
15 * No physical hardware was harmed running Windows during the
16 * reverse-engineering activity
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 * 1. Redistributions of source code must retain the above copyright
22 * notice, this list of conditions, and the following disclaimer,
23 * without modification.
24 * 2. The name of the author may not be used to endorse or promote products
25 * derived from this software without specific prior written permission.
26 *
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL").
29 */
30
31#include <linux/init.h>
32#include <linux/list.h>
33#include <linux/module.h>
34#include <linux/slab.h>
35#include <linux/usb.h>
36#include <linux/version.h>
37#include <linux/videodev2.h>
38
39#include <media/v4l2-device.h>
40#include <media/v4l2-ioctl.h>
41#include <media/videobuf2-core.h>
42#include <media/videobuf2-vmalloc.h>
43
44/* Hardware. */
45#define USBTV_VIDEO_ENDP 0x81
46#define USBTV_BASE 0xc000
47#define USBTV_REQUEST_REG 12
48
49/* Number of concurrent isochronous urbs submitted.
50 * Higher numbers was seen to overly saturate the USB bus. */
51#define USBTV_ISOC_TRANSFERS 16
52#define USBTV_ISOC_PACKETS 8
53
54#define USBTV_WIDTH 720
55#define USBTV_HEIGHT 480
56
57#define USBTV_CHUNK_SIZE 256
58#define USBTV_CHUNK 240
59#define USBTV_CHUNKS (USBTV_WIDTH * USBTV_HEIGHT \
a34cacab 60 / 4 / USBTV_CHUNK)
f3d27f34
LR		 61
62/* Chunk header. */
63#define USBTV_MAGIC_OK(chunk) ((be32_to_cpu(chunk[0]) & 0xff000000) \
64 == 0x88000000)
65#define USBTV_FRAME_ID(chunk) ((be32_to_cpu(chunk[0]) & 0x00ff0000) >> 16)
66#define USBTV_ODD(chunk) ((be32_to_cpu(chunk[0]) & 0x0000f000) >> 15)
67#define USBTV_CHUNK_NO(chunk) (be32_to_cpu(chunk[0]) & 0x00000fff)
68
69/* A single videobuf2 frame buffer. */
70struct usbtv_buf {
71 struct vb2_buffer vb;
72 struct list_head list;
73};
74
75/* Per-device structure. */
76struct usbtv {
77 struct device *dev;
78 struct usb_device *udev;
79 struct v4l2_device v4l2_dev;
80 struct video_device vdev;
81 struct vb2_queue vb2q;
82 struct mutex v4l2_lock;
83 struct mutex vb2q_lock;
84
85 /* List of videobuf2 buffers protected by a lock. */
86 spinlock_t buflock;
87 struct list_head bufs;
88
89 /* Number of currently processed frame, useful find
90 * out when a new one begins. */
91 u32 frame_id;
f52dc448 92 int chunks_done;
f3d27f34
LR		 93
94 int iso_size;
95 unsigned int sequence;
96 struct urb *isoc_urbs[USBTV_ISOC_TRANSFERS];
97};
98
99static int usbtv_setup_capture(struct usbtv *usbtv)
100{
101 int ret;
102 int pipe = usb_rcvctrlpipe(usbtv->udev, 0);
103 int i;
104 static const u16 protoregs[][2] = {
105 /* These seem to enable the device. */
106 { USBTV_BASE + 0x0008, 0x0001 },
107 { USBTV_BASE + 0x01d0, 0x00ff },
108 { USBTV_BASE + 0x01d9, 0x0002 },
109
110 /* These seem to influence color parameters, such as
111 * brightness, etc. */
112 { USBTV_BASE + 0x0239, 0x0040 },
113 { USBTV_BASE + 0x0240, 0x0000 },
114 { USBTV_BASE + 0x0241, 0x0000 },
115 { USBTV_BASE + 0x0242, 0x0002 },
116 { USBTV_BASE + 0x0243, 0x0080 },
117 { USBTV_BASE + 0x0244, 0x0012 },
118 { USBTV_BASE + 0x0245, 0x0090 },
119 { USBTV_BASE + 0x0246, 0x0000 },
120
121 { USBTV_BASE + 0x0278, 0x002d },
122 { USBTV_BASE + 0x0279, 0x000a },
123 { USBTV_BASE + 0x027a, 0x0032 },
124 { 0xf890, 0x000c },
125 { 0xf894, 0x0086 },
126
127 { USBTV_BASE + 0x00ac, 0x00c0 },
128 { USBTV_BASE + 0x00ad, 0x0000 },
129 { USBTV_BASE + 0x00a2, 0x0012 },
130 { USBTV_BASE + 0x00a3, 0x00e0 },
131 { USBTV_BASE + 0x00a4, 0x0028 },
132 { USBTV_BASE + 0x00a5, 0x0082 },
133 { USBTV_BASE + 0x00a7, 0x0080 },
134 { USBTV_BASE + 0x0000, 0x0014 },
135 { USBTV_BASE + 0x0006, 0x0003 },
136 { USBTV_BASE + 0x0090, 0x0099 },
137 { USBTV_BASE + 0x0091, 0x0090 },
138 { USBTV_BASE + 0x0094, 0x0068 },
139 { USBTV_BASE + 0x0095, 0x0070 },
140 { USBTV_BASE + 0x009c, 0x0030 },
141 { USBTV_BASE + 0x009d, 0x00c0 },
142 { USBTV_BASE + 0x009e, 0x00e0 },
143 { USBTV_BASE + 0x0019, 0x0006 },
144 { USBTV_BASE + 0x008c, 0x00ba },
145 { USBTV_BASE + 0x0101, 0x00ff },
146 { USBTV_BASE + 0x010c, 0x00b3 },
147 { USBTV_BASE + 0x01b2, 0x0080 },
148 { USBTV_BASE + 0x01b4, 0x00a0 },
149 { USBTV_BASE + 0x014c, 0x00ff },
150 { USBTV_BASE + 0x014d, 0x00ca },
151 { USBTV_BASE + 0x0113, 0x0053 },
152 { USBTV_BASE + 0x0119, 0x008a },
153 { USBTV_BASE + 0x013c, 0x0003 },
154 { USBTV_BASE + 0x0150, 0x009c },
155 { USBTV_BASE + 0x0151, 0x0071 },
156 { USBTV_BASE + 0x0152, 0x00c6 },
157 { USBTV_BASE + 0x0153, 0x0084 },
158 { USBTV_BASE + 0x0154, 0x00bc },
159 { USBTV_BASE + 0x0155, 0x00a0 },
160 { USBTV_BASE + 0x0156, 0x00a0 },
161 { USBTV_BASE + 0x0157, 0x009c },
162 { USBTV_BASE + 0x0158, 0x001f },
163 { USBTV_BASE + 0x0159, 0x0006 },
164 { USBTV_BASE + 0x015d, 0x0000 },
165
166 { USBTV_BASE + 0x0284, 0x0088 },
167 { USBTV_BASE + 0x0003, 0x0004 },
168 { USBTV_BASE + 0x001a, 0x0079 },
169 { USBTV_BASE + 0x0100, 0x00d3 },
170 { USBTV_BASE + 0x010e, 0x0068 },
171 { USBTV_BASE + 0x010f, 0x009c },
172 { USBTV_BASE + 0x0112, 0x00f0 },
173 { USBTV_BASE + 0x0115, 0x0015 },
174 { USBTV_BASE + 0x0117, 0x0000 },
175 { USBTV_BASE + 0x0118, 0x00fc },
176 { USBTV_BASE + 0x012d, 0x0004 },
177 { USBTV_BASE + 0x012f, 0x0008 },
178 { USBTV_BASE + 0x0220, 0x002e },
179 { USBTV_BASE + 0x0225, 0x0008 },
180 { USBTV_BASE + 0x024e, 0x0002 },
181 { USBTV_BASE + 0x024f, 0x0001 },
182 { USBTV_BASE + 0x0254, 0x005f },
183 { USBTV_BASE + 0x025a, 0x0012 },
184 { USBTV_BASE + 0x025b, 0x0001 },
185 { USBTV_BASE + 0x0263, 0x001c },
186 { USBTV_BASE + 0x0266, 0x0011 },
187 { USBTV_BASE + 0x0267, 0x0005 },
188 { USBTV_BASE + 0x024e, 0x0002 },
189 { USBTV_BASE + 0x024f, 0x0002 },
190 };
191
192 for (i = 0; i < ARRAY_SIZE(protoregs); i++) {
193 u16 index = protoregs[i][0];
194 u16 value = protoregs[i][1];
195
196 ret = usb_control_msg(usbtv->udev, pipe, USBTV_REQUEST_REG,
197 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
198 value, index, NULL, 0, 0);
199 if (ret < 0)
200 return ret;
201 }
202
203 return 0;
204}
205
a34cacab
LR		 206/* Copy data from chunk into a frame buffer, deinterlacing the data
207 * into every second line. Unfortunately, they don't align nicely into
208 * 720 pixel lines, as the chunk is 240 words long, which is 480 pixels.
209 * Therefore, we break down the chunk into two halves before copyting,
210 * so that we can interleave a line if needed. */
211static void usbtv_chunk_to_vbuf(u32 *frame, u32 *src, int chunk_no, int odd)
212{
213 int half;
214
215 for (half = 0; half < 2; half++) {
216 int part_no = chunk_no * 2 + half;
217 int line = part_no / 3;
218 int part_index = (line * 2 + !odd) * 3 + (part_no % 3);
219
220 u32 *dst = &frame[part_index * USBTV_CHUNK/2];
221 memcpy(dst, src, USBTV_CHUNK/2 * sizeof(*src));
222 src += USBTV_CHUNK/2;
223 }
224}
225
f3d27f34
LR		 226/* Called for each 256-byte image chunk.
227 * First word identifies the chunk, followed by 240 words of image
228 * data and padding. */
229static void usbtv_image_chunk(struct usbtv *usbtv, u32 *chunk)
230{
231 int frame_id, odd, chunk_no;
232 u32 *frame;
233 struct usbtv_buf *buf;
234 unsigned long flags;
235
236 /* Ignore corrupted lines. */
237 if (!USBTV_MAGIC_OK(chunk))
238 return;
239 frame_id = USBTV_FRAME_ID(chunk);
240 odd = USBTV_ODD(chunk);
241 chunk_no = USBTV_CHUNK_NO(chunk);
f3d27f34
LR		 242 if (chunk_no >= USBTV_CHUNKS)
243 return;
244
245 /* Beginning of a frame. */
f52dc448 246 if (chunk_no == 0) {
f3d27f34 247 usbtv->frame_id = frame_id;
f52dc448
LR		 248 usbtv->chunks_done = 0;
249 }
250
251 if (usbtv->frame_id != frame_id)
252 return;
f3d27f34
LR		 253
254 spin_lock_irqsave(&usbtv->buflock, flags);
255 if (list_empty(&usbtv->bufs)) {
256 /* No free buffers. Userspace likely too slow. */
257 spin_unlock_irqrestore(&usbtv->buflock, flags);
258 return;
259 }
260
261 /* First available buffer. */
262 buf = list_first_entry(&usbtv->bufs, struct usbtv_buf, list);
263 frame = vb2_plane_vaddr(&buf->vb, 0);
264
a34cacab
LR		 265 /* Copy the chunk data. */
266 usbtv_chunk_to_vbuf(frame, &chunk[1], chunk_no, odd);
f52dc448 267 usbtv->chunks_done++;
f3d27f34
LR		 268
269 /* Last chunk in a frame, signalling an end */
a34cacab 270 if (odd && chunk_no == USBTV_CHUNKS-1) {
f3d27f34 271 int size = vb2_plane_size(&buf->vb, 0);
f52dc448
LR		 272 enum vb2_buffer_state state = usbtv->chunks_done ==
273 USBTV_CHUNKS ?
274 VB2_BUF_STATE_DONE :
275 VB2_BUF_STATE_ERROR;
f3d27f34
LR		 276
277 buf->vb.v4l2_buf.field = V4L2_FIELD_INTERLACED;
278 buf->vb.v4l2_buf.sequence = usbtv->sequence++;
279 v4l2_get_timestamp(&buf->vb.v4l2_buf.timestamp);
280 vb2_set_plane_payload(&buf->vb, 0, size);
f52dc448 281 vb2_buffer_done(&buf->vb, state);
f3d27f34
LR		 282 list_del(&buf->list);
283 }
284
285 spin_unlock_irqrestore(&usbtv->buflock, flags);
286}
287
288/* Got image data. Each packet contains a number of 256-word chunks we
289 * compose the image from. */
290static void usbtv_iso_cb(struct urb *ip)
291{
292 int ret;
293 int i;
294 struct usbtv *usbtv = (struct usbtv *)ip->context;
295
296 switch (ip->status) {
297 /* All fine. */
298 case 0:
299 break;
300 /* Device disconnected or capture stopped? */
301 case -ENODEV:
302 case -ENOENT:
303 case -ECONNRESET:
304 case -ESHUTDOWN:
305 return;
306 /* Unknown error. Retry. */
307 default:
308 dev_warn(usbtv->dev, "Bad response for ISO request.\n");
309 goto resubmit;
310 }
311
312 for (i = 0; i < ip->number_of_packets; i++) {
313 int size = ip->iso_frame_desc[i].actual_length;
314 unsigned char *data = ip->transfer_buffer +
315 ip->iso_frame_desc[i].offset;
316 int offset;
317
318 for (offset = 0; USBTV_CHUNK_SIZE * offset < size; offset++)
319 usbtv_image_chunk(usbtv,
320 (u32 *)&data[USBTV_CHUNK_SIZE * offset]);
321 }
322
323resubmit:
324 ret = usb_submit_urb(ip, GFP_ATOMIC);
325 if (ret < 0)
326 dev_warn(usbtv->dev, "Could not resubmit ISO URB\n");
327}
328
329static struct urb *usbtv_setup_iso_transfer(struct usbtv *usbtv)
330{
331 struct urb *ip;
332 int size = usbtv->iso_size;
333 int i;
334
335 ip = usb_alloc_urb(USBTV_ISOC_PACKETS, GFP_KERNEL);
336 if (ip == NULL)
337 return NULL;
338
339 ip->dev = usbtv->udev;
340 ip->context = usbtv;
341 ip->pipe = usb_rcvisocpipe(usbtv->udev, USBTV_VIDEO_ENDP);
342 ip->interval = 1;
343 ip->transfer_flags = URB_ISO_ASAP;
344 ip->transfer_buffer = kzalloc(size * USBTV_ISOC_PACKETS,
345 GFP_KERNEL);
346 ip->complete = usbtv_iso_cb;
347 ip->number_of_packets = USBTV_ISOC_PACKETS;
348 ip->transfer_buffer_length = size * USBTV_ISOC_PACKETS;
349 for (i = 0; i < USBTV_ISOC_PACKETS; i++) {
350 ip->iso_frame_desc[i].offset = size * i;
351 ip->iso_frame_desc[i].length = size;
352 }
353
354 return ip;
355}
356
357static void usbtv_stop(struct usbtv *usbtv)
358{
359 int i;
360 unsigned long flags;
361
362 /* Cancel running transfers. */
363 for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) {
364 struct urb *ip = usbtv->isoc_urbs[i];
365 if (ip == NULL)
366 continue;
367 usb_kill_urb(ip);
368 kfree(ip->transfer_buffer);
369 usb_free_urb(ip);
370 usbtv->isoc_urbs[i] = NULL;
371 }
372
373 /* Return buffers to userspace. */
374 spin_lock_irqsave(&usbtv->buflock, flags);
375 while (!list_empty(&usbtv->bufs)) {
376 struct usbtv_buf *buf = list_first_entry(&usbtv->bufs,
377 struct usbtv_buf, list);
378 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
379 list_del(&buf->list);
380 }
381 spin_unlock_irqrestore(&usbtv->buflock, flags);
382}
383
384static int usbtv_start(struct usbtv *usbtv)
385{
386 int i;
387 int ret;
388
389 ret = usb_set_interface(usbtv->udev, 0, 0);
390 if (ret < 0)
391 return ret;
392
393 ret = usbtv_setup_capture(usbtv);
394 if (ret < 0)
395 return ret;
396
397 ret = usb_set_interface(usbtv->udev, 0, 1);
398 if (ret < 0)
399 return ret;
400
401 for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) {
402 struct urb *ip;
403
404 ip = usbtv_setup_iso_transfer(usbtv);
405 if (ip == NULL) {
406 ret = -ENOMEM;
407 goto start_fail;
408 }
409 usbtv->isoc_urbs[i] = ip;
410
411 ret = usb_submit_urb(ip, GFP_KERNEL);
412 if (ret < 0)
413 goto start_fail;
414 }
415
416 return 0;
417
418start_fail:
419 usbtv_stop(usbtv);
420 return ret;
421}
422
423struct usb_device_id usbtv_id_table[] = {
424 { USB_DEVICE(0x1b71, 0x3002) },
425 {}
426};
427MODULE_DEVICE_TABLE(usb, usbtv_id_table);
428
429static int usbtv_querycap(struct file *file, void *priv,
430 struct v4l2_capability *cap)
431{
432 struct usbtv *dev = video_drvdata(file);
433
434 strlcpy(cap->driver, "usbtv", sizeof(cap->driver));
435 strlcpy(cap->card, "usbtv", sizeof(cap->card));
436 usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
437 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE;
438 cap->device_caps |= V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
439 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
440 return 0;
441}
442
443static int usbtv_enum_input(struct file *file, void *priv,
444 struct v4l2_input *i)
445{
446 if (i->index > 0)
447 return -EINVAL;
448
449 strlcpy(i->name, "Composite", sizeof(i->name));
450 i->type = V4L2_INPUT_TYPE_CAMERA;
451 i->std = V4L2_STD_525_60;
452 return 0;
453}
454
455static int usbtv_enum_fmt_vid_cap(struct file *file, void *priv,
456 struct v4l2_fmtdesc *f)
457{
458 if (f->index > 0)
459 return -EINVAL;
460
461 strlcpy(f->description, "16 bpp YUY2, 4:2:2, packed",
462 sizeof(f->description));
463 f->pixelformat = V4L2_PIX_FMT_YUYV;
464 return 0;
465}
466
467static int usbtv_fmt_vid_cap(struct file *file, void *priv,
468 struct v4l2_format *f)
469{
470 f->fmt.pix.width = USBTV_WIDTH;
471 f->fmt.pix.height = USBTV_HEIGHT;
472 f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
473 f->fmt.pix.field = V4L2_FIELD_INTERLACED;
474 f->fmt.pix.bytesperline = USBTV_WIDTH * 2;
475 f->fmt.pix.sizeimage = (f->fmt.pix.bytesperline * f->fmt.pix.height);
476 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
477 f->fmt.pix.priv = 0;
478 return 0;
479}
480
481static int usbtv_g_std(struct file *file, void *priv, v4l2_std_id *norm)
482{
483 *norm = V4L2_STD_525_60;
484 return 0;
485}
486
487static int usbtv_g_input(struct file *file, void *priv, unsigned int *i)
488{
489 *i = 0;
490 return 0;
491}
492
493static int usbtv_s_input(struct file *file, void *priv, unsigned int i)
494{
495 if (i > 0)
496 return -EINVAL;
497 return 0;
498}
499
500static int usbtv_s_std(struct file *file, void *priv, v4l2_std_id norm)
501{
502 if (norm & V4L2_STD_525_60)
503 return 0;
504 return -EINVAL;
505}
506
507struct v4l2_ioctl_ops usbtv_ioctl_ops = {
508 .vidioc_querycap = usbtv_querycap,
509 .vidioc_enum_input = usbtv_enum_input,
510 .vidioc_enum_fmt_vid_cap = usbtv_enum_fmt_vid_cap,
511 .vidioc_g_fmt_vid_cap = usbtv_fmt_vid_cap,
512 .vidioc_try_fmt_vid_cap = usbtv_fmt_vid_cap,
513 .vidioc_s_fmt_vid_cap = usbtv_fmt_vid_cap,
514 .vidioc_g_std = usbtv_g_std,
515 .vidioc_s_std = usbtv_s_std,
516 .vidioc_g_input = usbtv_g_input,
517 .vidioc_s_input = usbtv_s_input,
518
519 .vidioc_reqbufs = vb2_ioctl_reqbufs,
520 .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
521 .vidioc_querybuf = vb2_ioctl_querybuf,
522 .vidioc_create_bufs = vb2_ioctl_create_bufs,
523 .vidioc_qbuf = vb2_ioctl_qbuf,
524 .vidioc_dqbuf = vb2_ioctl_dqbuf,
525 .vidioc_streamon = vb2_ioctl_streamon,
526 .vidioc_streamoff = vb2_ioctl_streamoff,
527};
528
529struct v4l2_file_operations usbtv_fops = {
530 .owner = THIS_MODULE,
531 .unlocked_ioctl = video_ioctl2,
532 .mmap = vb2_fop_mmap,
533 .open = v4l2_fh_open,
534 .release = vb2_fop_release,
535 .read = vb2_fop_read,
536 .poll = vb2_fop_poll,
537};
538
539static int usbtv_queue_setup(struct vb2_queue *vq,
540 const struct v4l2_format *v4l_fmt, unsigned int *nbuffers,
541 unsigned int *nplanes, unsigned int sizes[], void *alloc_ctxs[])
542{
543 if (*nbuffers < 2)
544 *nbuffers = 2;
545 *nplanes = 1;
a34cacab 546 sizes[0] = USBTV_WIDTH * USBTV_HEIGHT / 2 * sizeof(u32);
f3d27f34
LR		 547
548 return 0;
549}
550
551static void usbtv_buf_queue(struct vb2_buffer *vb)
552{
553 struct usbtv *usbtv = vb2_get_drv_priv(vb->vb2_queue);
554 struct usbtv_buf *buf = container_of(vb, struct usbtv_buf, vb);
555 unsigned long flags;
556
557 if (usbtv->udev == NULL) {
558 vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
559 return;
560 }
561
562 spin_lock_irqsave(&usbtv->buflock, flags);
563 list_add_tail(&buf->list, &usbtv->bufs);
564 spin_unlock_irqrestore(&usbtv->buflock, flags);
565}
566
567static int usbtv_start_streaming(struct vb2_queue *vq, unsigned int count)
568{
569 struct usbtv *usbtv = vb2_get_drv_priv(vq);
570
571 if (usbtv->udev == NULL)
572 return -ENODEV;
573
574 return usbtv_start(usbtv);
575}
576
577static int usbtv_stop_streaming(struct vb2_queue *vq)
578{
579 struct usbtv *usbtv = vb2_get_drv_priv(vq);
580
581 if (usbtv->udev == NULL)
582 return -ENODEV;
583
584 usbtv_stop(usbtv);
585 return 0;
586}
587
588struct vb2_ops usbtv_vb2_ops = {
589 .queue_setup = usbtv_queue_setup,
590 .buf_queue = usbtv_buf_queue,
591 .start_streaming = usbtv_start_streaming,
592 .stop_streaming = usbtv_stop_streaming,
593};
594
595static void usbtv_release(struct v4l2_device *v4l2_dev)
596{
597 struct usbtv *usbtv = container_of(v4l2_dev, struct usbtv, v4l2_dev);
598
599 v4l2_device_unregister(&usbtv->v4l2_dev);
600 vb2_queue_release(&usbtv->vb2q);
601 kfree(usbtv);
602}
603
604static int usbtv_probe(struct usb_interface *intf,
605 const struct usb_device_id *id)
606{
607 int ret;
608 int size;
609 struct device *dev = &intf->dev;
610 struct usbtv *usbtv;
611
612 /* Checks that the device is what we think it is. */
613 if (intf->num_altsetting != 2)
614 return -ENODEV;
615 if (intf->altsetting[1].desc.bNumEndpoints != 4)
616 return -ENODEV;
617
618 /* Packet size is split into 11 bits of base size and count of
619 * extra multiplies of it.*/
620 size = usb_endpoint_maxp(&intf->altsetting[1].endpoint[0].desc);
621 size = (size & 0x07ff) * (((size & 0x1800) >> 11) + 1);
622
623 /* Device structure */
624 usbtv = kzalloc(sizeof(struct usbtv), GFP_KERNEL);
625 if (usbtv == NULL)
626 return -ENOMEM;
627 usbtv->dev = dev;
628 usbtv->udev = usb_get_dev(interface_to_usbdev(intf));
629 usbtv->iso_size = size;
630 spin_lock_init(&usbtv->buflock);
631 mutex_init(&usbtv->v4l2_lock);
632 mutex_init(&usbtv->vb2q_lock);
633 INIT_LIST_HEAD(&usbtv->bufs);
634
635 /* videobuf2 structure */
636 usbtv->vb2q.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
637 usbtv->vb2q.io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ;
638 usbtv->vb2q.drv_priv = usbtv;
639 usbtv->vb2q.buf_struct_size = sizeof(struct usbtv_buf);
640 usbtv->vb2q.ops = &usbtv_vb2_ops;
641 usbtv->vb2q.mem_ops = &vb2_vmalloc_memops;
642 usbtv->vb2q.timestamp_type = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
643 usbtv->vb2q.lock = &usbtv->vb2q_lock;
644 ret = vb2_queue_init(&usbtv->vb2q);
645 if (ret < 0) {
646 dev_warn(dev, "Could not initialize videobuf2 queue\n");
647 goto usbtv_fail;
648 }
649
650 /* v4l2 structure */
651 usbtv->v4l2_dev.release = usbtv_release;
652 ret = v4l2_device_register(dev, &usbtv->v4l2_dev);
653 if (ret < 0) {
654 dev_warn(dev, "Could not register v4l2 device\n");
655 goto v4l2_fail;
656 }
657
658 usb_set_intfdata(intf, usbtv);
659
660 /* Video structure */
661 strlcpy(usbtv->vdev.name, "usbtv", sizeof(usbtv->vdev.name));
662 usbtv->vdev.v4l2_dev = &usbtv->v4l2_dev;
663 usbtv->vdev.release = video_device_release_empty;
664 usbtv->vdev.fops = &usbtv_fops;
665 usbtv->vdev.ioctl_ops = &usbtv_ioctl_ops;
666 usbtv->vdev.tvnorms = V4L2_STD_525_60;
667 usbtv->vdev.queue = &usbtv->vb2q;
668 usbtv->vdev.lock = &usbtv->v4l2_lock;
669 set_bit(V4L2_FL_USE_FH_PRIO, &usbtv->vdev.flags);
670 video_set_drvdata(&usbtv->vdev, usbtv);
671 ret = video_register_device(&usbtv->vdev, VFL_TYPE_GRABBER, -1);
672 if (ret < 0) {
673 dev_warn(dev, "Could not register video device\n");
674 goto vdev_fail;
675 }
676
677 dev_info(dev, "Fushicai USBTV007 Video Grabber\n");
678 return 0;
679
680vdev_fail:
681 v4l2_device_unregister(&usbtv->v4l2_dev);
682v4l2_fail:
683 vb2_queue_release(&usbtv->vb2q);
684usbtv_fail:
685 kfree(usbtv);
686
687 return ret;
688}
689
690static void usbtv_disconnect(struct usb_interface *intf)
691{
692 struct usbtv *usbtv = usb_get_intfdata(intf);
693
694 mutex_lock(&usbtv->vb2q_lock);
695 mutex_lock(&usbtv->v4l2_lock);
696
697 usbtv_stop(usbtv);
698 usb_set_intfdata(intf, NULL);
699 video_unregister_device(&usbtv->vdev);
700 v4l2_device_disconnect(&usbtv->v4l2_dev);
701 usb_put_dev(usbtv->udev);
702 usbtv->udev = NULL;
703
704 mutex_unlock(&usbtv->v4l2_lock);
705 mutex_unlock(&usbtv->vb2q_lock);
706
707 v4l2_device_put(&usbtv->v4l2_dev);
708}
709
710MODULE_AUTHOR("Lubomir Rintel");
711MODULE_DESCRIPTION("Fushicai USBTV007 Video Grabber Driver");
712MODULE_LICENSE("Dual BSD/GPL");
713
714struct usb_driver usbtv_usb_driver = {
715 .name = "usbtv",
716 .id_table = usbtv_id_table,
717 .probe = usbtv_probe,
718 .disconnect = usbtv_disconnect,
719};
720
721module_usb_driver(usbtv_usb_driver);
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