1// SPDX-License-Identifier: GPL-2.0-only
2#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
3
4#include <media/drv-intf/saa7146_vv.h>
5#include <linux/module.h>
6
7/****************************************************************************/
8/* resource management functions, shamelessly stolen from saa7134 driver */
9
10int saa7146_res_get(struct saa7146_fh *fh, unsigned int bit)
11{
12	struct saa7146_dev *dev = fh->dev;
13	struct saa7146_vv *vv = dev->vv_data;
14
15	if (fh->resources & bit) {
16		DEB_D("already allocated! want: 0x%02x, cur:0x%02x\n",
17		      bit, vv->resources);
18		/* have it already allocated */
19		return 1;
20	}
21
22	/* is it free? */
23	if (vv->resources & bit) {
24		DEB_D("locked! vv->resources:0x%02x, we want:0x%02x\n",
25		      vv->resources, bit);
26		/* no, someone else uses it */
27		return 0;
28	}
29	/* it's free, grab it */
30	fh->resources |= bit;
31	vv->resources |= bit;
32	DEB_D("res: get 0x%02x, cur:0x%02x\n", bit, vv->resources);
33	return 1;
34}
35
36void saa7146_res_free(struct saa7146_fh *fh, unsigned int bits)
37{
38	struct saa7146_dev *dev = fh->dev;
39	struct saa7146_vv *vv = dev->vv_data;
40
41	BUG_ON((fh->resources & bits) != bits);
42
43	fh->resources &= ~bits;
44	vv->resources &= ~bits;
45	DEB_D("res: put 0x%02x, cur:0x%02x\n", bits, vv->resources);
46}
47
48
49/********************************************************************************/
50/* common dma functions */
51
52void saa7146_dma_free(struct saa7146_dev *dev,struct videobuf_queue *q,
53						struct saa7146_buf *buf)
54{
55	struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
56	DEB_EE("dev:%p, buf:%p\n", dev, buf);
57
58	BUG_ON(in_interrupt());
59
60	videobuf_waiton(q, &buf->vb, 0, 0);
61	videobuf_dma_unmap(q->dev, dma);
62	videobuf_dma_free(dma);
63	buf->vb.state = VIDEOBUF_NEEDS_INIT;
64}
65
66
67/********************************************************************************/
68/* common buffer functions */
69
70int saa7146_buffer_queue(struct saa7146_dev *dev,
71			 struct saa7146_dmaqueue *q,
72			 struct saa7146_buf *buf)
73{
74	assert_spin_locked(&dev->slock);
75	DEB_EE("dev:%p, dmaq:%p, buf:%p\n", dev, q, buf);
76
77	BUG_ON(!q);
78
79	if (NULL == q->curr) {
80		q->curr = buf;
81		DEB_D("immediately activating buffer %p\n", buf);
82		buf->activate(dev,buf,NULL);
83	} else {
84		list_add_tail(&buf->vb.queue,&q->queue);
85		buf->vb.state = VIDEOBUF_QUEUED;
86		DEB_D("adding buffer %p to queue. (active buffer present)\n",
87		      buf);
88	}
89	return 0;
90}
91
92void saa7146_buffer_finish(struct saa7146_dev *dev,
93			   struct saa7146_dmaqueue *q,
94			   int state)
95{
96	assert_spin_locked(&dev->slock);
97	DEB_EE("dev:%p, dmaq:%p, state:%d\n", dev, q, state);
98	DEB_EE("q->curr:%p\n", q->curr);
99
100	/* finish current buffer */
101	if (NULL == q->curr) {
102		DEB_D("aiii. no current buffer\n");
103		return;
104	}
105
106	q->curr->vb.state = state;
107	q->curr->vb.ts = ktime_get_ns();
108	wake_up(&q->curr->vb.done);
109
110	q->curr = NULL;
111}
112
113void saa7146_buffer_next(struct saa7146_dev *dev,
114			 struct saa7146_dmaqueue *q, int vbi)
115{
116	struct saa7146_buf *buf,*next = NULL;
117
118	BUG_ON(!q);
119
120	DEB_INT("dev:%p, dmaq:%p, vbi:%d\n", dev, q, vbi);
121
122	assert_spin_locked(&dev->slock);
123	if (!list_empty(&q->queue)) {
124		/* activate next one from queue */
125		buf = list_entry(q->queue.next,struct saa7146_buf,vb.queue);
126		list_del(&buf->vb.queue);
127		if (!list_empty(&q->queue))
128			next = list_entry(q->queue.next,struct saa7146_buf, vb.queue);
129		q->curr = buf;
130		DEB_INT("next buffer: buf:%p, prev:%p, next:%p\n",
131			buf, q->queue.prev, q->queue.next);
132		buf->activate(dev,buf,next);
133	} else {
134		DEB_INT("no next buffer. stopping.\n");
135		if( 0 != vbi ) {
136			/* turn off video-dma3 */
137			saa7146_write(dev,MC1, MASK_20);
138		} else {
139			/* nothing to do -- just prevent next video-dma1 transfer
140			   by lowering the protection address */
141
142			// fixme: fix this for vflip != 0
143
144			saa7146_write(dev, PROT_ADDR1, 0);
145			saa7146_write(dev, MC2, (MASK_02|MASK_18));
146
147			/* write the address of the rps-program */
148			saa7146_write(dev, RPS_ADDR0, dev->d_rps0.dma_handle);
149			/* turn on rps */
150			saa7146_write(dev, MC1, (MASK_12 | MASK_28));
151
152/*
153			printk("vdma%d.base_even:     0x%08x\n", 1,saa7146_read(dev,BASE_EVEN1));
154			printk("vdma%d.base_odd:      0x%08x\n", 1,saa7146_read(dev,BASE_ODD1));
155			printk("vdma%d.prot_addr:     0x%08x\n", 1,saa7146_read(dev,PROT_ADDR1));
156			printk("vdma%d.base_page:     0x%08x\n", 1,saa7146_read(dev,BASE_PAGE1));
157			printk("vdma%d.pitch:         0x%08x\n", 1,saa7146_read(dev,PITCH1));
158			printk("vdma%d.num_line_byte: 0x%08x\n", 1,saa7146_read(dev,NUM_LINE_BYTE1));
159*/
160		}
161		del_timer(&q->timeout);
162	}
163}
164
165void saa7146_buffer_timeout(struct timer_list *t)
166{
167	struct saa7146_dmaqueue *q = from_timer(q, t, timeout);
168	struct saa7146_dev *dev = q->dev;
169	unsigned long flags;
170
171	DEB_EE("dev:%p, dmaq:%p\n", dev, q);
172
173	spin_lock_irqsave(&dev->slock,flags);
174	if (q->curr) {
175		DEB_D("timeout on %p\n", q->curr);
176		saa7146_buffer_finish(dev,q,VIDEOBUF_ERROR);
177	}
178
179	/* we don't restart the transfer here like other drivers do. when
180	   a streaming capture is disabled, the timeout function will be
181	   called for the current buffer. if we activate the next buffer now,
182	   we mess up our capture logic. if a timeout occurs on another buffer,
183	   then something is seriously broken before, so no need to buffer the
184	   next capture IMHO... */
185/*
186	saa7146_buffer_next(dev,q);
187*/
188	spin_unlock_irqrestore(&dev->slock,flags);
189}
190
191/********************************************************************************/
192/* file operations */
193
194static int fops_open(struct file *file)
195{
196	struct video_device *vdev = video_devdata(file);
197	struct saa7146_dev *dev = video_drvdata(file);
198	struct saa7146_fh *fh = NULL;
199	int result = 0;
200
201	DEB_EE("file:%p, dev:%s\n", file, video_device_node_name(vdev));
202
203	if (mutex_lock_interruptible(vdev->lock))
204		return -ERESTARTSYS;
205
206	DEB_D("using: %p\n", dev);
207
208	/* check if an extension is registered */
209	if( NULL == dev->ext ) {
210		DEB_S("no extension registered for this device\n");
211		result = -ENODEV;
212		goto out;
213	}
214
215	/* allocate per open data */
216	fh = kzalloc(sizeof(*fh),GFP_KERNEL);
217	if (NULL == fh) {
218		DEB_S("cannot allocate memory for per open data\n");
219		result = -ENOMEM;
220		goto out;
221	}
222
223	v4l2_fh_init(&fh->fh, vdev);
224
225	file->private_data = &fh->fh;
226	fh->dev = dev;
227
228	if (vdev->vfl_type == VFL_TYPE_VBI) {
229		DEB_S("initializing vbi...\n");
230		if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
231			result = saa7146_vbi_uops.open(dev,file);
232		if (dev->ext_vv_data->vbi_fops.open)
233			dev->ext_vv_data->vbi_fops.open(file);
234	} else {
235		DEB_S("initializing video...\n");
236		result = saa7146_video_uops.open(dev,file);
237	}
238
239	if (0 != result) {
240		goto out;
241	}
242
243	if( 0 == try_module_get(dev->ext->module)) {
244		result = -EINVAL;
245		goto out;
246	}
247
248	result = 0;
249	v4l2_fh_add(&fh->fh);
250out:
251	if (fh && result != 0) {
252		kfree(fh);
253		file->private_data = NULL;
254	}
255	mutex_unlock(vdev->lock);
256	return result;
257}
258
259static int fops_release(struct file *file)
260{
261	struct video_device *vdev = video_devdata(file);
262	struct saa7146_fh  *fh  = file->private_data;
263	struct saa7146_dev *dev = fh->dev;
264
265	DEB_EE("file:%p\n", file);
266
267	mutex_lock(vdev->lock);
268
269	if (vdev->vfl_type == VFL_TYPE_VBI) {
270		if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
271			saa7146_vbi_uops.release(dev,file);
272		if (dev->ext_vv_data->vbi_fops.release)
273			dev->ext_vv_data->vbi_fops.release(file);
274	} else {
275		saa7146_video_uops.release(dev,file);
276	}
277
278	v4l2_fh_del(&fh->fh);
279	v4l2_fh_exit(&fh->fh);
280	module_put(dev->ext->module);
281	file->private_data = NULL;
282	kfree(fh);
283
284	mutex_unlock(vdev->lock);
285
286	return 0;
287}
288
289static int fops_mmap(struct file *file, struct vm_area_struct * vma)
290{
291	struct video_device *vdev = video_devdata(file);
292	struct saa7146_fh *fh = file->private_data;
293	struct videobuf_queue *q;
294	int res;
295
296	switch (vdev->vfl_type) {
297	case VFL_TYPE_VIDEO: {
298		DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, vma:%p\n",
299		       file, vma);
300		q = &fh->video_q;
301		break;
302		}
303	case VFL_TYPE_VBI: {
304		DEB_EE("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, vma:%p\n",
305		       file, vma);
306		if (fh->dev->ext_vv_data->capabilities & V4L2_CAP_SLICED_VBI_OUTPUT)
307			return -ENODEV;
308		q = &fh->vbi_q;
309		break;
310		}
311	default:
312		BUG();
313	}
314
315	if (mutex_lock_interruptible(vdev->lock))
316		return -ERESTARTSYS;
317	res = videobuf_mmap_mapper(q, vma);
318	mutex_unlock(vdev->lock);
319	return res;
320}
321
322static __poll_t __fops_poll(struct file *file, struct poll_table_struct *wait)
323{
324	struct video_device *vdev = video_devdata(file);
325	struct saa7146_fh *fh = file->private_data;
326	struct videobuf_buffer *buf = NULL;
327	struct videobuf_queue *q;
328	__poll_t res = v4l2_ctrl_poll(file, wait);
329
330	DEB_EE("file:%p, poll:%p\n", file, wait);
331
332	if (vdev->vfl_type == VFL_TYPE_VBI) {
333		if (fh->dev->ext_vv_data->capabilities & V4L2_CAP_SLICED_VBI_OUTPUT)
334			return res | EPOLLOUT | EPOLLWRNORM;
335		if( 0 == fh->vbi_q.streaming )
336			return res | videobuf_poll_stream(file, &fh->vbi_q, wait);
337		q = &fh->vbi_q;
338	} else {
339		DEB_D("using video queue\n");
340		q = &fh->video_q;
341	}
342
343	if (!list_empty(&q->stream))
344		buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
345
346	if (!buf) {
347		DEB_D("buf == NULL!\n");
348		return res | EPOLLERR;
349	}
350
351	poll_wait(file, &buf->done, wait);
352	if (buf->state == VIDEOBUF_DONE || buf->state == VIDEOBUF_ERROR) {
353		DEB_D("poll succeeded!\n");
354		return res | EPOLLIN | EPOLLRDNORM;
355	}
356
357	DEB_D("nothing to poll for, buf->state:%d\n", buf->state);
358	return res;
359}
360
361static __poll_t fops_poll(struct file *file, struct poll_table_struct *wait)
362{
363	struct video_device *vdev = video_devdata(file);
364	__poll_t res;
365
366	mutex_lock(vdev->lock);
367	res = __fops_poll(file, wait);
368	mutex_unlock(vdev->lock);
369	return res;
370}
371
372static ssize_t fops_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
373{
374	struct video_device *vdev = video_devdata(file);
375	struct saa7146_fh *fh = file->private_data;
376	int ret;
377
378	switch (vdev->vfl_type) {
379	case VFL_TYPE_VIDEO:
380/*
381		DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, data:%p, count:%lun",
382		       file, data, (unsigned long)count);
383*/
384		return saa7146_video_uops.read(file,data,count,ppos);
385	case VFL_TYPE_VBI:
386/*
387		DEB_EE("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, data:%p, count:%lu\n",
388		       file, data, (unsigned long)count);
389*/
390		if (fh->dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE) {
391			if (mutex_lock_interruptible(vdev->lock))
392				return -ERESTARTSYS;
393			ret = saa7146_vbi_uops.read(file, data, count, ppos);
394			mutex_unlock(vdev->lock);
395			return ret;
396		}
397		return -EINVAL;
398	default:
399		BUG();
400	}
401}
402
403static ssize_t fops_write(struct file *file, const char __user *data, size_t count, loff_t *ppos)
404{
405	struct video_device *vdev = video_devdata(file);
406	struct saa7146_fh *fh = file->private_data;
407	int ret;
408
409	switch (vdev->vfl_type) {
410	case VFL_TYPE_VIDEO:
411		return -EINVAL;
412	case VFL_TYPE_VBI:
413		if (fh->dev->ext_vv_data->vbi_fops.write) {
414			if (mutex_lock_interruptible(vdev->lock))
415				return -ERESTARTSYS;
416			ret = fh->dev->ext_vv_data->vbi_fops.write(file, data, count, ppos);
417			mutex_unlock(vdev->lock);
418			return ret;
419		}
420		return -EINVAL;
421	default:
422		BUG();
423	}
424}
425
426static const struct v4l2_file_operations video_fops =
427{
428	.owner		= THIS_MODULE,
429	.open		= fops_open,
430	.release	= fops_release,
431	.read		= fops_read,
432	.write		= fops_write,
433	.poll		= fops_poll,
434	.mmap		= fops_mmap,
435	.unlocked_ioctl	= video_ioctl2,
436};
437
438static void vv_callback(struct saa7146_dev *dev, unsigned long status)
439{
440	u32 isr = status;
441
442	DEB_INT("dev:%p, isr:0x%08x\n", dev, (u32)status);
443
444	if (0 != (isr & (MASK_27))) {
445		DEB_INT("irq: RPS0 (0x%08x)\n", isr);
446		saa7146_video_uops.irq_done(dev,isr);
447	}
448
449	if (0 != (isr & (MASK_28))) {
450		u32 mc2 = saa7146_read(dev, MC2);
451		if( 0 != (mc2 & MASK_15)) {
452			DEB_INT("irq: RPS1 vbi workaround (0x%08x)\n", isr);
453			wake_up(&dev->vv_data->vbi_wq);
454			saa7146_write(dev,MC2, MASK_31);
455			return;
456		}
457		DEB_INT("irq: RPS1 (0x%08x)\n", isr);
458		saa7146_vbi_uops.irq_done(dev,isr);
459	}
460}
461
462static const struct v4l2_ctrl_ops saa7146_ctrl_ops = {
463	.s_ctrl = saa7146_s_ctrl,
464};
465
466int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
467{
468	struct v4l2_ctrl_handler *hdl = &dev->ctrl_handler;
469	struct v4l2_pix_format *fmt;
470	struct v4l2_vbi_format *vbi;
471	struct saa7146_vv *vv;
472	int err;
473
474	err = v4l2_device_register(&dev->pci->dev, &dev->v4l2_dev);
475	if (err)
476		return err;
477
478	v4l2_ctrl_handler_init(hdl, 6);
479	v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
480		V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
481	v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
482		V4L2_CID_CONTRAST, 0, 127, 1, 64);
483	v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
484		V4L2_CID_SATURATION, 0, 127, 1, 64);
485	v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
486		V4L2_CID_VFLIP, 0, 1, 1, 0);
487	v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
488		V4L2_CID_HFLIP, 0, 1, 1, 0);
489	if (hdl->error) {
490		err = hdl->error;
491		v4l2_ctrl_handler_free(hdl);
492		return err;
493	}
494	dev->v4l2_dev.ctrl_handler = hdl;
495
496	vv = kzalloc(sizeof(struct saa7146_vv), GFP_KERNEL);
497	if (vv == NULL) {
498		ERR("out of memory. aborting.\n");
499		v4l2_ctrl_handler_free(hdl);
500		return -ENOMEM;
501	}
502	ext_vv->vid_ops = saa7146_video_ioctl_ops;
503	ext_vv->vbi_ops = saa7146_vbi_ioctl_ops;
504	ext_vv->core_ops = &saa7146_video_ioctl_ops;
505
506	DEB_EE("dev:%p\n", dev);
507
508	/* set default values for video parts of the saa7146 */
509	saa7146_write(dev, BCS_CTRL, 0x80400040);
510
511	/* enable video-port pins */
512	saa7146_write(dev, MC1, (MASK_10 | MASK_26));
513
514	/* save per-device extension data (one extension can
515	   handle different devices that might need different
516	   configuration data) */
517	dev->ext_vv_data = ext_vv;
518
519	vv->d_clipping.cpu_addr =
520		pci_zalloc_consistent(dev->pci, SAA7146_CLIPPING_MEM,
521				      &vv->d_clipping.dma_handle);
522	if( NULL == vv->d_clipping.cpu_addr ) {
523		ERR("out of memory. aborting.\n");
524		kfree(vv);
525		v4l2_ctrl_handler_free(hdl);
526		return -ENOMEM;
527	}
528
529	saa7146_video_uops.init(dev,vv);
530	if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
531		saa7146_vbi_uops.init(dev,vv);
532
533	vv->ov_fb.fmt.width = vv->standard->h_max_out;
534	vv->ov_fb.fmt.height = vv->standard->v_max_out;
535	vv->ov_fb.fmt.pixelformat = V4L2_PIX_FMT_RGB565;
536	vv->ov_fb.fmt.bytesperline = 2 * vv->ov_fb.fmt.width;
537	vv->ov_fb.fmt.sizeimage = vv->ov_fb.fmt.bytesperline * vv->ov_fb.fmt.height;
538	vv->ov_fb.fmt.colorspace = V4L2_COLORSPACE_SRGB;
539
540	fmt = &vv->video_fmt;
541	fmt->width = 384;
542	fmt->height = 288;
543	fmt->pixelformat = V4L2_PIX_FMT_BGR24;
544	fmt->field = V4L2_FIELD_ANY;
545	fmt->colorspace = V4L2_COLORSPACE_SMPTE170M;
546	fmt->bytesperline = 3 * fmt->width;
547	fmt->sizeimage = fmt->bytesperline * fmt->height;
548
549	vbi = &vv->vbi_fmt;
550	vbi->sampling_rate	= 27000000;
551	vbi->offset		= 248; /* todo */
552	vbi->samples_per_line	= 720 * 2;
553	vbi->sample_format	= V4L2_PIX_FMT_GREY;
554
555	/* fixme: this only works for PAL */
556	vbi->start[0] = 5;
557	vbi->count[0] = 16;
558	vbi->start[1] = 312;
559	vbi->count[1] = 16;
560
561	timer_setup(&vv->vbi_read_timeout, NULL, 0);
562
563	vv->ov_fb.capability = V4L2_FBUF_CAP_LIST_CLIPPING;
564	vv->ov_fb.flags = V4L2_FBUF_FLAG_PRIMARY;
565	dev->vv_data = vv;
566	dev->vv_callback = &vv_callback;
567
568	return 0;
569}
570EXPORT_SYMBOL_GPL(saa7146_vv_init);
571
572int saa7146_vv_release(struct saa7146_dev* dev)
573{
574	struct saa7146_vv *vv = dev->vv_data;
575
576	DEB_EE("dev:%p\n", dev);
577
578	v4l2_device_unregister(&dev->v4l2_dev);
579	pci_free_consistent(dev->pci, SAA7146_CLIPPING_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
580	v4l2_ctrl_handler_free(&dev->ctrl_handler);
581	kfree(vv);
582	dev->vv_data = NULL;
583	dev->vv_callback = NULL;
584
585	return 0;
586}
587EXPORT_SYMBOL_GPL(saa7146_vv_release);
588
589int saa7146_register_device(struct video_device *vfd, struct saa7146_dev *dev,
590			    char *name, int type)
591{
592	int err;
593	int i;
594
595	DEB_EE("dev:%p, name:'%s', type:%d\n", dev, name, type);
596
597	vfd->fops = &video_fops;
598	if (type == VFL_TYPE_VIDEO)
599		vfd->ioctl_ops = &dev->ext_vv_data->vid_ops;
600	else
601		vfd->ioctl_ops = &dev->ext_vv_data->vbi_ops;
602	vfd->release = video_device_release_empty;
603	vfd->lock = &dev->v4l2_lock;
604	vfd->v4l2_dev = &dev->v4l2_dev;
605	vfd->tvnorms = 0;
606	for (i = 0; i < dev->ext_vv_data->num_stds; i++)
607		vfd->tvnorms |= dev->ext_vv_data->stds[i].id;
608	strscpy(vfd->name, name, sizeof(vfd->name));
609	vfd->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OVERLAY |
610			   V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
611	vfd->device_caps |= dev->ext_vv_data->capabilities;
612	if (type == VFL_TYPE_VIDEO)
613		vfd->device_caps &=
614			~(V4L2_CAP_VBI_CAPTURE | V4L2_CAP_SLICED_VBI_OUTPUT);
615	else
616		vfd->device_caps &=
617			~(V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OVERLAY | V4L2_CAP_AUDIO);
618	video_set_drvdata(vfd, dev);
619
620	err = video_register_device(vfd, type, -1);
621	if (err < 0) {
622		ERR("cannot register v4l2 device. skipping.\n");
623		return err;
624	}
625
626	pr_info("%s: registered device %s [v4l2]\n",
627		dev->name, video_device_node_name(vfd));
628	return 0;
629}
630EXPORT_SYMBOL_GPL(saa7146_register_device);
631
632int saa7146_unregister_device(struct video_device *vfd, struct saa7146_dev *dev)
633{
634	DEB_EE("dev:%p\n", dev);
635
636	video_unregister_device(vfd);
637	return 0;
638}
639EXPORT_SYMBOL_GPL(saa7146_unregister_device);
640
641static int __init saa7146_vv_init_module(void)
642{
643	return 0;
644}
645
646
647static void __exit saa7146_vv_cleanup_module(void)
648{
649}
650
651module_init(saa7146_vv_init_module);
652module_exit(saa7146_vv_cleanup_module);
653
654MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
655MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
656MODULE_LICENSE("GPL");
657