1 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
2 
3 #include <media/saa7146_vv.h>
4 #include <media/v4l2-event.h>
5 #include <media/v4l2-ctrls.h>
6 #include <linux/module.h>
7 
8 static int max_memory = 32;
9 
10 module_param(max_memory, int, 0644);
11 MODULE_PARM_DESC(max_memory, "maximum memory usage for capture buffers (default: 32Mb)");
12 
13 #define IS_CAPTURE_ACTIVE(fh) \
14 	(((vv->video_status & STATUS_CAPTURE) != 0) && (vv->video_fh == fh))
15 
16 #define IS_OVERLAY_ACTIVE(fh) \
17 	(((vv->video_status & STATUS_OVERLAY) != 0) && (vv->video_fh == fh))
18 
19 /* format descriptions for capture and preview */
20 static struct saa7146_format formats[] = {
21 	{
22 		.name		= "RGB-8 (3-3-2)",
23 		.pixelformat	= V4L2_PIX_FMT_RGB332,
24 		.trans		= RGB08_COMPOSED,
25 		.depth		= 8,
26 		.flags		= 0,
27 	}, {
28 		.name		= "RGB-16 (5/B-6/G-5/R)",
29 		.pixelformat	= V4L2_PIX_FMT_RGB565,
30 		.trans		= RGB16_COMPOSED,
31 		.depth		= 16,
32 		.flags		= 0,
33 	}, {
34 		.name		= "RGB-24 (B-G-R)",
35 		.pixelformat	= V4L2_PIX_FMT_BGR24,
36 		.trans		= RGB24_COMPOSED,
37 		.depth		= 24,
38 		.flags		= 0,
39 	}, {
40 		.name		= "RGB-32 (B-G-R)",
41 		.pixelformat	= V4L2_PIX_FMT_BGR32,
42 		.trans		= RGB32_COMPOSED,
43 		.depth		= 32,
44 		.flags		= 0,
45 	}, {
46 		.name		= "RGB-32 (R-G-B)",
47 		.pixelformat	= V4L2_PIX_FMT_RGB32,
48 		.trans		= RGB32_COMPOSED,
49 		.depth		= 32,
50 		.flags		= 0,
51 		.swap		= 0x2,
52 	}, {
53 		.name		= "Greyscale-8",
54 		.pixelformat	= V4L2_PIX_FMT_GREY,
55 		.trans		= Y8,
56 		.depth		= 8,
57 		.flags		= 0,
58 	}, {
59 		.name		= "YUV 4:2:2 planar (Y-Cb-Cr)",
60 		.pixelformat	= V4L2_PIX_FMT_YUV422P,
61 		.trans		= YUV422_DECOMPOSED,
62 		.depth		= 16,
63 		.flags		= FORMAT_BYTE_SWAP|FORMAT_IS_PLANAR,
64 	}, {
65 		.name		= "YVU 4:2:0 planar (Y-Cb-Cr)",
66 		.pixelformat	= V4L2_PIX_FMT_YVU420,
67 		.trans		= YUV420_DECOMPOSED,
68 		.depth		= 12,
69 		.flags		= FORMAT_BYTE_SWAP|FORMAT_IS_PLANAR,
70 	}, {
71 		.name		= "YUV 4:2:0 planar (Y-Cb-Cr)",
72 		.pixelformat	= V4L2_PIX_FMT_YUV420,
73 		.trans		= YUV420_DECOMPOSED,
74 		.depth		= 12,
75 		.flags		= FORMAT_IS_PLANAR,
76 	}, {
77 		.name		= "YUV 4:2:2 (U-Y-V-Y)",
78 		.pixelformat	= V4L2_PIX_FMT_UYVY,
79 		.trans		= YUV422_COMPOSED,
80 		.depth		= 16,
81 		.flags		= 0,
82 	}
83 };
84 
85 /* unfortunately, the saa7146 contains a bug which prevents it from doing on-the-fly byte swaps.
86    due to this, it's impossible to provide additional *packed* formats, which are simply byte swapped
87    (like V4L2_PIX_FMT_YUYV) ... 8-( */
88 
89 static int NUM_FORMATS = sizeof(formats)/sizeof(struct saa7146_format);
90 
91 struct saa7146_format* saa7146_format_by_fourcc(struct saa7146_dev *dev, int fourcc)
92 {
93 	int i, j = NUM_FORMATS;
94 
95 	for (i = 0; i < j; i++) {
96 		if (formats[i].pixelformat == fourcc) {
97 			return formats+i;
98 		}
99 	}
100 
101 	DEB_D("unknown pixelformat:'%4.4s'\n", (char *)&fourcc);
102 	return NULL;
103 }
104 
105 static int vidioc_try_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f);
106 
107 int saa7146_start_preview(struct saa7146_fh *fh)
108 {
109 	struct saa7146_dev *dev = fh->dev;
110 	struct saa7146_vv *vv = dev->vv_data;
111 	struct v4l2_format fmt;
112 	int ret = 0, err = 0;
113 
114 	DEB_EE("dev:%p, fh:%p\n", dev, fh);
115 
116 	/* check if we have overlay information */
117 	if (vv->ov.fh == NULL) {
118 		DEB_D("no overlay data available. try S_FMT first.\n");
119 		return -EAGAIN;
120 	}
121 
122 	/* check if streaming capture is running */
123 	if (IS_CAPTURE_ACTIVE(fh) != 0) {
124 		DEB_D("streaming capture is active\n");
125 		return -EBUSY;
126 	}
127 
128 	/* check if overlay is running */
129 	if (IS_OVERLAY_ACTIVE(fh) != 0) {
130 		if (vv->video_fh == fh) {
131 			DEB_D("overlay is already active\n");
132 			return 0;
133 		}
134 		DEB_D("overlay is already active in another open\n");
135 		return -EBUSY;
136 	}
137 
138 	if (0 == saa7146_res_get(fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP)) {
139 		DEB_D("cannot get necessary overlay resources\n");
140 		return -EBUSY;
141 	}
142 
143 	fmt.fmt.win = vv->ov.win;
144 	err = vidioc_try_fmt_vid_overlay(NULL, fh, &fmt);
145 	if (0 != err) {
146 		saa7146_res_free(vv->video_fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
147 		return -EBUSY;
148 	}
149 	vv->ov.win = fmt.fmt.win;
150 
151 	DEB_D("%dx%d+%d+%d %s field=%s\n",
152 	      vv->ov.win.w.width, vv->ov.win.w.height,
153 	      vv->ov.win.w.left, vv->ov.win.w.top,
154 	      vv->ov_fmt->name, v4l2_field_names[vv->ov.win.field]);
155 
156 	if (0 != (ret = saa7146_enable_overlay(fh))) {
157 		DEB_D("enabling overlay failed: %d\n", ret);
158 		saa7146_res_free(vv->video_fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
159 		return ret;
160 	}
161 
162 	vv->video_status = STATUS_OVERLAY;
163 	vv->video_fh = fh;
164 
165 	return 0;
166 }
167 EXPORT_SYMBOL_GPL(saa7146_start_preview);
168 
169 int saa7146_stop_preview(struct saa7146_fh *fh)
170 {
171 	struct saa7146_dev *dev = fh->dev;
172 	struct saa7146_vv *vv = dev->vv_data;
173 
174 	DEB_EE("dev:%p, fh:%p\n", dev, fh);
175 
176 	/* check if streaming capture is running */
177 	if (IS_CAPTURE_ACTIVE(fh) != 0) {
178 		DEB_D("streaming capture is active\n");
179 		return -EBUSY;
180 	}
181 
182 	/* check if overlay is running at all */
183 	if ((vv->video_status & STATUS_OVERLAY) == 0) {
184 		DEB_D("no active overlay\n");
185 		return 0;
186 	}
187 
188 	if (vv->video_fh != fh) {
189 		DEB_D("overlay is active, but in another open\n");
190 		return -EBUSY;
191 	}
192 
193 	vv->video_status = 0;
194 	vv->video_fh = NULL;
195 
196 	saa7146_disable_overlay(fh);
197 
198 	saa7146_res_free(fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
199 
200 	return 0;
201 }
202 EXPORT_SYMBOL_GPL(saa7146_stop_preview);
203 
204 /********************************************************************************/
205 /* common pagetable functions */
206 
207 static int saa7146_pgtable_build(struct saa7146_dev *dev, struct saa7146_buf *buf)
208 {
209 	struct pci_dev *pci = dev->pci;
210 	struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
211 	struct scatterlist *list = dma->sglist;
212 	int length = dma->sglen;
213 	struct saa7146_format *sfmt = saa7146_format_by_fourcc(dev,buf->fmt->pixelformat);
214 
215 	DEB_EE("dev:%p, buf:%p, sg_len:%d\n", dev, buf, length);
216 
217 	if( 0 != IS_PLANAR(sfmt->trans)) {
218 		struct saa7146_pgtable *pt1 = &buf->pt[0];
219 		struct saa7146_pgtable *pt2 = &buf->pt[1];
220 		struct saa7146_pgtable *pt3 = &buf->pt[2];
221 		__le32  *ptr1, *ptr2, *ptr3;
222 		__le32 fill;
223 
224 		int size = buf->fmt->width*buf->fmt->height;
225 		int i,p,m1,m2,m3,o1,o2;
226 
227 		switch( sfmt->depth ) {
228 			case 12: {
229 				/* create some offsets inside the page table */
230 				m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
231 				m2 = ((size+(size/4)+PAGE_SIZE)/PAGE_SIZE)-1;
232 				m3 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
233 				o1 = size%PAGE_SIZE;
234 				o2 = (size+(size/4))%PAGE_SIZE;
235 				DEB_CAP("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",
236 					size, m1, m2, m3, o1, o2);
237 				break;
238 			}
239 			case 16: {
240 				/* create some offsets inside the page table */
241 				m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
242 				m2 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
243 				m3 = ((2*size+PAGE_SIZE)/PAGE_SIZE)-1;
244 				o1 = size%PAGE_SIZE;
245 				o2 = (size+(size/2))%PAGE_SIZE;
246 				DEB_CAP("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",
247 					size, m1, m2, m3, o1, o2);
248 				break;
249 			}
250 			default: {
251 				return -1;
252 			}
253 		}
254 
255 		ptr1 = pt1->cpu;
256 		ptr2 = pt2->cpu;
257 		ptr3 = pt3->cpu;
258 
259 		/* walk all pages, copy all page addresses to ptr1 */
260 		for (i = 0; i < length; i++, list++) {
261 			for (p = 0; p * 4096 < list->length; p++, ptr1++) {
262 				*ptr1 = cpu_to_le32(sg_dma_address(list) - list->offset);
263 			}
264 		}
265 /*
266 		ptr1 = pt1->cpu;
267 		for(j=0;j<40;j++) {
268 			printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
269 		}
270 */
271 
272 		/* if we have a user buffer, the first page may not be
273 		   aligned to a page boundary. */
274 		pt1->offset = dma->sglist->offset;
275 		pt2->offset = pt1->offset+o1;
276 		pt3->offset = pt1->offset+o2;
277 
278 		/* create video-dma2 page table */
279 		ptr1 = pt1->cpu;
280 		for(i = m1; i <= m2 ; i++, ptr2++) {
281 			*ptr2 = ptr1[i];
282 		}
283 		fill = *(ptr2-1);
284 		for(;i<1024;i++,ptr2++) {
285 			*ptr2 = fill;
286 		}
287 		/* create video-dma3 page table */
288 		ptr1 = pt1->cpu;
289 		for(i = m2; i <= m3; i++,ptr3++) {
290 			*ptr3 = ptr1[i];
291 		}
292 		fill = *(ptr3-1);
293 		for(;i<1024;i++,ptr3++) {
294 			*ptr3 = fill;
295 		}
296 		/* finally: finish up video-dma1 page table */
297 		ptr1 = pt1->cpu+m1;
298 		fill = pt1->cpu[m1];
299 		for(i=m1;i<1024;i++,ptr1++) {
300 			*ptr1 = fill;
301 		}
302 /*
303 		ptr1 = pt1->cpu;
304 		ptr2 = pt2->cpu;
305 		ptr3 = pt3->cpu;
306 		for(j=0;j<40;j++) {
307 			printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
308 		}
309 		for(j=0;j<40;j++) {
310 			printk("ptr2 %d: 0x%08x\n",j,ptr2[j]);
311 		}
312 		for(j=0;j<40;j++) {
313 			printk("ptr3 %d: 0x%08x\n",j,ptr3[j]);
314 		}
315 */
316 	} else {
317 		struct saa7146_pgtable *pt = &buf->pt[0];
318 		return saa7146_pgtable_build_single(pci, pt, list, length);
319 	}
320 
321 	return 0;
322 }
323 
324 
325 /********************************************************************************/
326 /* file operations */
327 
328 static int video_begin(struct saa7146_fh *fh)
329 {
330 	struct saa7146_dev *dev = fh->dev;
331 	struct saa7146_vv *vv = dev->vv_data;
332 	struct saa7146_format *fmt = NULL;
333 	unsigned int resource;
334 	int ret = 0, err = 0;
335 
336 	DEB_EE("dev:%p, fh:%p\n", dev, fh);
337 
338 	if ((vv->video_status & STATUS_CAPTURE) != 0) {
339 		if (vv->video_fh == fh) {
340 			DEB_S("already capturing\n");
341 			return 0;
342 		}
343 		DEB_S("already capturing in another open\n");
344 		return -EBUSY;
345 	}
346 
347 	if ((vv->video_status & STATUS_OVERLAY) != 0) {
348 		DEB_S("warning: suspending overlay video for streaming capture\n");
349 		vv->ov_suspend = vv->video_fh;
350 		err = saa7146_stop_preview(vv->video_fh); /* side effect: video_status is now 0, video_fh is NULL */
351 		if (0 != err) {
352 			DEB_D("suspending video failed. aborting\n");
353 			return err;
354 		}
355 	}
356 
357 	fmt = saa7146_format_by_fourcc(dev, vv->video_fmt.pixelformat);
358 	/* we need to have a valid format set here */
359 	BUG_ON(NULL == fmt);
360 
361 	if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
362 		resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
363 	} else {
364 		resource = RESOURCE_DMA1_HPS;
365 	}
366 
367 	ret = saa7146_res_get(fh, resource);
368 	if (0 == ret) {
369 		DEB_S("cannot get capture resource %d\n", resource);
370 		if (vv->ov_suspend != NULL) {
371 			saa7146_start_preview(vv->ov_suspend);
372 			vv->ov_suspend = NULL;
373 		}
374 		return -EBUSY;
375 	}
376 
377 	/* clear out beginning of streaming bit (rps register 0)*/
378 	saa7146_write(dev, MC2, MASK_27 );
379 
380 	/* enable rps0 irqs */
381 	SAA7146_IER_ENABLE(dev, MASK_27);
382 
383 	vv->video_fh = fh;
384 	vv->video_status = STATUS_CAPTURE;
385 
386 	return 0;
387 }
388 
389 static int video_end(struct saa7146_fh *fh, struct file *file)
390 {
391 	struct saa7146_dev *dev = fh->dev;
392 	struct saa7146_vv *vv = dev->vv_data;
393 	struct saa7146_format *fmt = NULL;
394 	unsigned long flags;
395 	unsigned int resource;
396 	u32 dmas = 0;
397 	DEB_EE("dev:%p, fh:%p\n", dev, fh);
398 
399 	if ((vv->video_status & STATUS_CAPTURE) != STATUS_CAPTURE) {
400 		DEB_S("not capturing\n");
401 		return 0;
402 	}
403 
404 	if (vv->video_fh != fh) {
405 		DEB_S("capturing, but in another open\n");
406 		return -EBUSY;
407 	}
408 
409 	fmt = saa7146_format_by_fourcc(dev, vv->video_fmt.pixelformat);
410 	/* we need to have a valid format set here */
411 	BUG_ON(NULL == fmt);
412 
413 	if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
414 		resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
415 		dmas = MASK_22 | MASK_21 | MASK_20;
416 	} else {
417 		resource = RESOURCE_DMA1_HPS;
418 		dmas = MASK_22;
419 	}
420 	spin_lock_irqsave(&dev->slock,flags);
421 
422 	/* disable rps0  */
423 	saa7146_write(dev, MC1, MASK_28);
424 
425 	/* disable rps0 irqs */
426 	SAA7146_IER_DISABLE(dev, MASK_27);
427 
428 	/* shut down all used video dma transfers */
429 	saa7146_write(dev, MC1, dmas);
430 
431 	spin_unlock_irqrestore(&dev->slock, flags);
432 
433 	vv->video_fh = NULL;
434 	vv->video_status = 0;
435 
436 	saa7146_res_free(fh, resource);
437 
438 	if (vv->ov_suspend != NULL) {
439 		saa7146_start_preview(vv->ov_suspend);
440 		vv->ov_suspend = NULL;
441 	}
442 
443 	return 0;
444 }
445 
446 static int vidioc_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
447 {
448 	struct video_device *vdev = video_devdata(file);
449 	struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
450 
451 	strcpy((char *)cap->driver, "saa7146 v4l2");
452 	strlcpy((char *)cap->card, dev->ext->name, sizeof(cap->card));
453 	sprintf((char *)cap->bus_info, "PCI:%s", pci_name(dev->pci));
454 	cap->device_caps =
455 		V4L2_CAP_VIDEO_CAPTURE |
456 		V4L2_CAP_VIDEO_OVERLAY |
457 		V4L2_CAP_READWRITE |
458 		V4L2_CAP_STREAMING;
459 	cap->device_caps |= dev->ext_vv_data->capabilities;
460 	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
461 	if (vdev->vfl_type == VFL_TYPE_GRABBER)
462 		cap->device_caps &=
463 			~(V4L2_CAP_VBI_CAPTURE | V4L2_CAP_SLICED_VBI_OUTPUT);
464 	else
465 		cap->device_caps &=
466 			~(V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OVERLAY | V4L2_CAP_AUDIO);
467 	return 0;
468 }
469 
470 static int vidioc_g_fbuf(struct file *file, void *fh, struct v4l2_framebuffer *fb)
471 {
472 	struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
473 	struct saa7146_vv *vv = dev->vv_data;
474 
475 	*fb = vv->ov_fb;
476 	fb->capability = V4L2_FBUF_CAP_LIST_CLIPPING;
477 	fb->flags = V4L2_FBUF_FLAG_PRIMARY;
478 	return 0;
479 }
480 
481 static int vidioc_s_fbuf(struct file *file, void *fh, const struct v4l2_framebuffer *fb)
482 {
483 	struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
484 	struct saa7146_vv *vv = dev->vv_data;
485 	struct saa7146_format *fmt;
486 
487 	DEB_EE("VIDIOC_S_FBUF\n");
488 
489 	if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
490 		return -EPERM;
491 
492 	/* check args */
493 	fmt = saa7146_format_by_fourcc(dev, fb->fmt.pixelformat);
494 	if (NULL == fmt)
495 		return -EINVAL;
496 
497 	/* planar formats are not allowed for overlay video, clipping and video dma would clash */
498 	if (fmt->flags & FORMAT_IS_PLANAR)
499 		DEB_S("planar pixelformat '%4.4s' not allowed for overlay\n",
500 		      (char *)&fmt->pixelformat);
501 
502 	/* check if overlay is running */
503 	if (IS_OVERLAY_ACTIVE(fh) != 0) {
504 		if (vv->video_fh != fh) {
505 			DEB_D("refusing to change framebuffer informations while overlay is active in another open\n");
506 			return -EBUSY;
507 		}
508 	}
509 
510 	/* ok, accept it */
511 	vv->ov_fb = *fb;
512 	vv->ov_fmt = fmt;
513 
514 	if (vv->ov_fb.fmt.bytesperline < vv->ov_fb.fmt.width) {
515 		vv->ov_fb.fmt.bytesperline = vv->ov_fb.fmt.width * fmt->depth / 8;
516 		DEB_D("setting bytesperline to %d\n", vv->ov_fb.fmt.bytesperline);
517 	}
518 	return 0;
519 }
520 
521 static int vidioc_enum_fmt_vid_cap(struct file *file, void *fh, struct v4l2_fmtdesc *f)
522 {
523 	if (f->index >= NUM_FORMATS)
524 		return -EINVAL;
525 	strlcpy((char *)f->description, formats[f->index].name,
526 			sizeof(f->description));
527 	f->pixelformat = formats[f->index].pixelformat;
528 	return 0;
529 }
530 
531 int saa7146_s_ctrl(struct v4l2_ctrl *ctrl)
532 {
533 	struct saa7146_dev *dev = container_of(ctrl->handler,
534 				struct saa7146_dev, ctrl_handler);
535 	struct saa7146_vv *vv = dev->vv_data;
536 	u32 val;
537 
538 	switch (ctrl->id) {
539 	case V4L2_CID_BRIGHTNESS:
540 		val = saa7146_read(dev, BCS_CTRL);
541 		val &= 0x00ffffff;
542 		val |= (ctrl->val << 24);
543 		saa7146_write(dev, BCS_CTRL, val);
544 		saa7146_write(dev, MC2, MASK_22 | MASK_06);
545 		break;
546 
547 	case V4L2_CID_CONTRAST:
548 		val = saa7146_read(dev, BCS_CTRL);
549 		val &= 0xff00ffff;
550 		val |= (ctrl->val << 16);
551 		saa7146_write(dev, BCS_CTRL, val);
552 		saa7146_write(dev, MC2, MASK_22 | MASK_06);
553 		break;
554 
555 	case V4L2_CID_SATURATION:
556 		val = saa7146_read(dev, BCS_CTRL);
557 		val &= 0xffffff00;
558 		val |= (ctrl->val << 0);
559 		saa7146_write(dev, BCS_CTRL, val);
560 		saa7146_write(dev, MC2, MASK_22 | MASK_06);
561 		break;
562 
563 	case V4L2_CID_HFLIP:
564 		/* fixme: we can support changing VFLIP and HFLIP here... */
565 		if ((vv->video_status & STATUS_CAPTURE))
566 			return -EBUSY;
567 		vv->hflip = ctrl->val;
568 		break;
569 
570 	case V4L2_CID_VFLIP:
571 		if ((vv->video_status & STATUS_CAPTURE))
572 			return -EBUSY;
573 		vv->vflip = ctrl->val;
574 		break;
575 
576 	default:
577 		return -EINVAL;
578 	}
579 
580 	if ((vv->video_status & STATUS_OVERLAY) != 0) { /* CHECK: && (vv->video_fh == fh)) */
581 		struct saa7146_fh *fh = vv->video_fh;
582 
583 		saa7146_stop_preview(fh);
584 		saa7146_start_preview(fh);
585 	}
586 	return 0;
587 }
588 
589 static int vidioc_g_parm(struct file *file, void *fh,
590 		struct v4l2_streamparm *parm)
591 {
592 	struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
593 	struct saa7146_vv *vv = dev->vv_data;
594 
595 	if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
596 		return -EINVAL;
597 	parm->parm.capture.readbuffers = 1;
598 	v4l2_video_std_frame_period(vv->standard->id,
599 				    &parm->parm.capture.timeperframe);
600 	return 0;
601 }
602 
603 static int vidioc_g_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f)
604 {
605 	struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
606 	struct saa7146_vv *vv = dev->vv_data;
607 
608 	f->fmt.pix = vv->video_fmt;
609 	return 0;
610 }
611 
612 static int vidioc_g_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f)
613 {
614 	struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
615 	struct saa7146_vv *vv = dev->vv_data;
616 
617 	f->fmt.win = vv->ov.win;
618 	return 0;
619 }
620 
621 static int vidioc_g_fmt_vbi_cap(struct file *file, void *fh, struct v4l2_format *f)
622 {
623 	struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
624 	struct saa7146_vv *vv = dev->vv_data;
625 
626 	f->fmt.vbi = vv->vbi_fmt;
627 	return 0;
628 }
629 
630 static int vidioc_try_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f)
631 {
632 	struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
633 	struct saa7146_vv *vv = dev->vv_data;
634 	struct saa7146_format *fmt;
635 	enum v4l2_field field;
636 	int maxw, maxh;
637 	int calc_bpl;
638 
639 	DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: dev:%p, fh:%p\n", dev, fh);
640 
641 	fmt = saa7146_format_by_fourcc(dev, f->fmt.pix.pixelformat);
642 	if (NULL == fmt)
643 		return -EINVAL;
644 
645 	field = f->fmt.pix.field;
646 	maxw  = vv->standard->h_max_out;
647 	maxh  = vv->standard->v_max_out;
648 
649 	if (V4L2_FIELD_ANY == field) {
650 		field = (f->fmt.pix.height > maxh / 2)
651 			? V4L2_FIELD_INTERLACED
652 			: V4L2_FIELD_BOTTOM;
653 	}
654 	switch (field) {
655 	case V4L2_FIELD_ALTERNATE:
656 		vv->last_field = V4L2_FIELD_TOP;
657 		maxh = maxh / 2;
658 		break;
659 	case V4L2_FIELD_TOP:
660 	case V4L2_FIELD_BOTTOM:
661 		vv->last_field = V4L2_FIELD_INTERLACED;
662 		maxh = maxh / 2;
663 		break;
664 	case V4L2_FIELD_INTERLACED:
665 		vv->last_field = V4L2_FIELD_INTERLACED;
666 		break;
667 	default:
668 		DEB_D("no known field mode '%d'\n", field);
669 		return -EINVAL;
670 	}
671 
672 	f->fmt.pix.field = field;
673 	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
674 	if (f->fmt.pix.width > maxw)
675 		f->fmt.pix.width = maxw;
676 	if (f->fmt.pix.height > maxh)
677 		f->fmt.pix.height = maxh;
678 
679 	calc_bpl = (f->fmt.pix.width * fmt->depth) / 8;
680 
681 	if (f->fmt.pix.bytesperline < calc_bpl)
682 		f->fmt.pix.bytesperline = calc_bpl;
683 
684 	if (f->fmt.pix.bytesperline > (2 * PAGE_SIZE * fmt->depth) / 8) /* arbitrary constraint */
685 		f->fmt.pix.bytesperline = calc_bpl;
686 
687 	f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * f->fmt.pix.height;
688 	DEB_D("w:%d, h:%d, bytesperline:%d, sizeimage:%d\n",
689 	      f->fmt.pix.width, f->fmt.pix.height,
690 	      f->fmt.pix.bytesperline, f->fmt.pix.sizeimage);
691 
692 	return 0;
693 }
694 
695 
696 static int vidioc_try_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f)
697 {
698 	struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
699 	struct saa7146_vv *vv = dev->vv_data;
700 	struct v4l2_window *win = &f->fmt.win;
701 	enum v4l2_field field;
702 	int maxw, maxh;
703 
704 	DEB_EE("dev:%p\n", dev);
705 
706 	if (NULL == vv->ov_fb.base) {
707 		DEB_D("no fb base set\n");
708 		return -EINVAL;
709 	}
710 	if (NULL == vv->ov_fmt) {
711 		DEB_D("no fb fmt set\n");
712 		return -EINVAL;
713 	}
714 	if (win->w.width < 48 || win->w.height < 32) {
715 		DEB_D("min width/height. (%d,%d)\n",
716 		      win->w.width, win->w.height);
717 		return -EINVAL;
718 	}
719 	if (win->clipcount > 16) {
720 		DEB_D("clipcount too big\n");
721 		return -EINVAL;
722 	}
723 
724 	field = win->field;
725 	maxw  = vv->standard->h_max_out;
726 	maxh  = vv->standard->v_max_out;
727 
728 	if (V4L2_FIELD_ANY == field) {
729 		field = (win->w.height > maxh / 2)
730 			? V4L2_FIELD_INTERLACED
731 			: V4L2_FIELD_TOP;
732 		}
733 	switch (field) {
734 	case V4L2_FIELD_TOP:
735 	case V4L2_FIELD_BOTTOM:
736 	case V4L2_FIELD_ALTERNATE:
737 		maxh = maxh / 2;
738 		break;
739 	case V4L2_FIELD_INTERLACED:
740 		break;
741 	default:
742 		DEB_D("no known field mode '%d'\n", field);
743 		return -EINVAL;
744 	}
745 
746 	win->field = field;
747 	if (win->w.width > maxw)
748 		win->w.width = maxw;
749 	if (win->w.height > maxh)
750 		win->w.height = maxh;
751 
752 	return 0;
753 }
754 
755 static int vidioc_s_fmt_vid_cap(struct file *file, void *__fh, struct v4l2_format *f)
756 {
757 	struct saa7146_fh *fh = __fh;
758 	struct saa7146_dev *dev = fh->dev;
759 	struct saa7146_vv *vv = dev->vv_data;
760 	int err;
761 
762 	DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: dev:%p, fh:%p\n", dev, fh);
763 	if (IS_CAPTURE_ACTIVE(fh) != 0) {
764 		DEB_EE("streaming capture is active\n");
765 		return -EBUSY;
766 	}
767 	err = vidioc_try_fmt_vid_cap(file, fh, f);
768 	if (0 != err)
769 		return err;
770 	vv->video_fmt = f->fmt.pix;
771 	DEB_EE("set to pixelformat '%4.4s'\n",
772 	       (char *)&vv->video_fmt.pixelformat);
773 	return 0;
774 }
775 
776 static int vidioc_s_fmt_vid_overlay(struct file *file, void *__fh, struct v4l2_format *f)
777 {
778 	struct saa7146_fh *fh = __fh;
779 	struct saa7146_dev *dev = fh->dev;
780 	struct saa7146_vv *vv = dev->vv_data;
781 	int err;
782 
783 	DEB_EE("V4L2_BUF_TYPE_VIDEO_OVERLAY: dev:%p, fh:%p\n", dev, fh);
784 	err = vidioc_try_fmt_vid_overlay(file, fh, f);
785 	if (0 != err)
786 		return err;
787 	vv->ov.win    = f->fmt.win;
788 	vv->ov.nclips = f->fmt.win.clipcount;
789 	if (vv->ov.nclips > 16)
790 		vv->ov.nclips = 16;
791 	if (copy_from_user(vv->ov.clips, f->fmt.win.clips,
792 				sizeof(struct v4l2_clip) * vv->ov.nclips)) {
793 		return -EFAULT;
794 	}
795 
796 	/* vv->ov.fh is used to indicate that we have valid overlay informations, too */
797 	vv->ov.fh = fh;
798 
799 	/* check if our current overlay is active */
800 	if (IS_OVERLAY_ACTIVE(fh) != 0) {
801 		saa7146_stop_preview(fh);
802 		saa7146_start_preview(fh);
803 	}
804 	return 0;
805 }
806 
807 static int vidioc_g_std(struct file *file, void *fh, v4l2_std_id *norm)
808 {
809 	struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
810 	struct saa7146_vv *vv = dev->vv_data;
811 
812 	*norm = vv->standard->id;
813 	return 0;
814 }
815 
816 	/* the saa7146 supfhrts (used in conjunction with the saa7111a for example)
817 	   PAL / NTSC / SECAM. if your hardware does not (or does more)
818 	   -- override this function in your extension */
819 /*
820 	case VIDIOC_ENUMSTD:
821 	{
822 		struct v4l2_standard *e = arg;
823 		if (e->index < 0 )
824 			return -EINVAL;
825 		if( e->index < dev->ext_vv_data->num_stds ) {
826 			DEB_EE("VIDIOC_ENUMSTD: index:%d\n", e->index);
827 			v4l2_video_std_construct(e, dev->ext_vv_data->stds[e->index].id, dev->ext_vv_data->stds[e->index].name);
828 			return 0;
829 		}
830 		return -EINVAL;
831 	}
832 	*/
833 
834 static int vidioc_s_std(struct file *file, void *fh, v4l2_std_id id)
835 {
836 	struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
837 	struct saa7146_vv *vv = dev->vv_data;
838 	int found = 0;
839 	int err, i;
840 
841 	DEB_EE("VIDIOC_S_STD\n");
842 
843 	if ((vv->video_status & STATUS_CAPTURE) == STATUS_CAPTURE) {
844 		DEB_D("cannot change video standard while streaming capture is active\n");
845 		return -EBUSY;
846 	}
847 
848 	if ((vv->video_status & STATUS_OVERLAY) != 0) {
849 		vv->ov_suspend = vv->video_fh;
850 		err = saa7146_stop_preview(vv->video_fh); /* side effect: video_status is now 0, video_fh is NULL */
851 		if (0 != err) {
852 			DEB_D("suspending video failed. aborting\n");
853 			return err;
854 		}
855 	}
856 
857 	for (i = 0; i < dev->ext_vv_data->num_stds; i++)
858 		if (id & dev->ext_vv_data->stds[i].id)
859 			break;
860 	if (i != dev->ext_vv_data->num_stds) {
861 		vv->standard = &dev->ext_vv_data->stds[i];
862 		if (NULL != dev->ext_vv_data->std_callback)
863 			dev->ext_vv_data->std_callback(dev, vv->standard);
864 		found = 1;
865 	}
866 
867 	if (vv->ov_suspend != NULL) {
868 		saa7146_start_preview(vv->ov_suspend);
869 		vv->ov_suspend = NULL;
870 	}
871 
872 	if (!found) {
873 		DEB_EE("VIDIOC_S_STD: standard not found\n");
874 		return -EINVAL;
875 	}
876 
877 	DEB_EE("VIDIOC_S_STD: set to standard to '%s'\n", vv->standard->name);
878 	return 0;
879 }
880 
881 static int vidioc_overlay(struct file *file, void *fh, unsigned int on)
882 {
883 	int err;
884 
885 	DEB_D("VIDIOC_OVERLAY on:%d\n", on);
886 	if (on)
887 		err = saa7146_start_preview(fh);
888 	else
889 		err = saa7146_stop_preview(fh);
890 	return err;
891 }
892 
893 static int vidioc_reqbufs(struct file *file, void *__fh, struct v4l2_requestbuffers *b)
894 {
895 	struct saa7146_fh *fh = __fh;
896 
897 	if (b->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
898 		return videobuf_reqbufs(&fh->video_q, b);
899 	if (b->type == V4L2_BUF_TYPE_VBI_CAPTURE)
900 		return videobuf_reqbufs(&fh->vbi_q, b);
901 	return -EINVAL;
902 }
903 
904 static int vidioc_querybuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
905 {
906 	struct saa7146_fh *fh = __fh;
907 
908 	if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
909 		return videobuf_querybuf(&fh->video_q, buf);
910 	if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
911 		return videobuf_querybuf(&fh->vbi_q, buf);
912 	return -EINVAL;
913 }
914 
915 static int vidioc_qbuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
916 {
917 	struct saa7146_fh *fh = __fh;
918 
919 	if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
920 		return videobuf_qbuf(&fh->video_q, buf);
921 	if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
922 		return videobuf_qbuf(&fh->vbi_q, buf);
923 	return -EINVAL;
924 }
925 
926 static int vidioc_dqbuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
927 {
928 	struct saa7146_fh *fh = __fh;
929 
930 	if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
931 		return videobuf_dqbuf(&fh->video_q, buf, file->f_flags & O_NONBLOCK);
932 	if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
933 		return videobuf_dqbuf(&fh->vbi_q, buf, file->f_flags & O_NONBLOCK);
934 	return -EINVAL;
935 }
936 
937 static int vidioc_streamon(struct file *file, void *__fh, enum v4l2_buf_type type)
938 {
939 	struct saa7146_fh *fh = __fh;
940 	int err;
941 
942 	DEB_D("VIDIOC_STREAMON, type:%d\n", type);
943 
944 	err = video_begin(fh);
945 	if (err)
946 		return err;
947 	if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
948 		return videobuf_streamon(&fh->video_q);
949 	if (type == V4L2_BUF_TYPE_VBI_CAPTURE)
950 		return videobuf_streamon(&fh->vbi_q);
951 	return -EINVAL;
952 }
953 
954 static int vidioc_streamoff(struct file *file, void *__fh, enum v4l2_buf_type type)
955 {
956 	struct saa7146_fh *fh = __fh;
957 	struct saa7146_dev *dev = fh->dev;
958 	struct saa7146_vv *vv = dev->vv_data;
959 	int err;
960 
961 	DEB_D("VIDIOC_STREAMOFF, type:%d\n", type);
962 
963 	/* ugly: we need to copy some checks from video_end(),
964 	   because videobuf_streamoff() relies on the capture running.
965 	   check and fix this */
966 	if ((vv->video_status & STATUS_CAPTURE) != STATUS_CAPTURE) {
967 		DEB_S("not capturing\n");
968 		return 0;
969 	}
970 
971 	if (vv->video_fh != fh) {
972 		DEB_S("capturing, but in another open\n");
973 		return -EBUSY;
974 	}
975 
976 	err = -EINVAL;
977 	if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
978 		err = videobuf_streamoff(&fh->video_q);
979 	else if (type == V4L2_BUF_TYPE_VBI_CAPTURE)
980 		err = videobuf_streamoff(&fh->vbi_q);
981 	if (0 != err) {
982 		DEB_D("warning: videobuf_streamoff() failed\n");
983 		video_end(fh, file);
984 	} else {
985 		err = video_end(fh, file);
986 	}
987 	return err;
988 }
989 
990 const struct v4l2_ioctl_ops saa7146_video_ioctl_ops = {
991 	.vidioc_querycap             = vidioc_querycap,
992 	.vidioc_enum_fmt_vid_cap     = vidioc_enum_fmt_vid_cap,
993 	.vidioc_enum_fmt_vid_overlay = vidioc_enum_fmt_vid_cap,
994 	.vidioc_g_fmt_vid_cap        = vidioc_g_fmt_vid_cap,
995 	.vidioc_try_fmt_vid_cap      = vidioc_try_fmt_vid_cap,
996 	.vidioc_s_fmt_vid_cap        = vidioc_s_fmt_vid_cap,
997 	.vidioc_g_fmt_vid_overlay    = vidioc_g_fmt_vid_overlay,
998 	.vidioc_try_fmt_vid_overlay  = vidioc_try_fmt_vid_overlay,
999 	.vidioc_s_fmt_vid_overlay    = vidioc_s_fmt_vid_overlay,
1000 
1001 	.vidioc_overlay 	     = vidioc_overlay,
1002 	.vidioc_g_fbuf  	     = vidioc_g_fbuf,
1003 	.vidioc_s_fbuf  	     = vidioc_s_fbuf,
1004 	.vidioc_reqbufs              = vidioc_reqbufs,
1005 	.vidioc_querybuf             = vidioc_querybuf,
1006 	.vidioc_qbuf                 = vidioc_qbuf,
1007 	.vidioc_dqbuf                = vidioc_dqbuf,
1008 	.vidioc_g_std                = vidioc_g_std,
1009 	.vidioc_s_std                = vidioc_s_std,
1010 	.vidioc_streamon             = vidioc_streamon,
1011 	.vidioc_streamoff            = vidioc_streamoff,
1012 	.vidioc_g_parm 		     = vidioc_g_parm,
1013 	.vidioc_subscribe_event      = v4l2_ctrl_subscribe_event,
1014 	.vidioc_unsubscribe_event    = v4l2_event_unsubscribe,
1015 };
1016 
1017 const struct v4l2_ioctl_ops saa7146_vbi_ioctl_ops = {
1018 	.vidioc_querycap             = vidioc_querycap,
1019 	.vidioc_g_fmt_vbi_cap        = vidioc_g_fmt_vbi_cap,
1020 
1021 	.vidioc_reqbufs              = vidioc_reqbufs,
1022 	.vidioc_querybuf             = vidioc_querybuf,
1023 	.vidioc_qbuf                 = vidioc_qbuf,
1024 	.vidioc_dqbuf                = vidioc_dqbuf,
1025 	.vidioc_g_std                = vidioc_g_std,
1026 	.vidioc_s_std                = vidioc_s_std,
1027 	.vidioc_streamon             = vidioc_streamon,
1028 	.vidioc_streamoff            = vidioc_streamoff,
1029 	.vidioc_g_parm		     = vidioc_g_parm,
1030 	.vidioc_subscribe_event      = v4l2_ctrl_subscribe_event,
1031 	.vidioc_unsubscribe_event    = v4l2_event_unsubscribe,
1032 };
1033 
1034 /*********************************************************************************/
1035 /* buffer handling functions                                                  */
1036 
1037 static int buffer_activate (struct saa7146_dev *dev,
1038 		     struct saa7146_buf *buf,
1039 		     struct saa7146_buf *next)
1040 {
1041 	struct saa7146_vv *vv = dev->vv_data;
1042 
1043 	buf->vb.state = VIDEOBUF_ACTIVE;
1044 	saa7146_set_capture(dev,buf,next);
1045 
1046 	mod_timer(&vv->video_dmaq.timeout, jiffies+BUFFER_TIMEOUT);
1047 	return 0;
1048 }
1049 
1050 static void release_all_pagetables(struct saa7146_dev *dev, struct saa7146_buf *buf)
1051 {
1052 	saa7146_pgtable_free(dev->pci, &buf->pt[0]);
1053 	saa7146_pgtable_free(dev->pci, &buf->pt[1]);
1054 	saa7146_pgtable_free(dev->pci, &buf->pt[2]);
1055 }
1056 
1057 static int buffer_prepare(struct videobuf_queue *q,
1058 			  struct videobuf_buffer *vb, enum v4l2_field field)
1059 {
1060 	struct file *file = q->priv_data;
1061 	struct saa7146_fh *fh = file->private_data;
1062 	struct saa7146_dev *dev = fh->dev;
1063 	struct saa7146_vv *vv = dev->vv_data;
1064 	struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1065 	int size,err = 0;
1066 
1067 	DEB_CAP("vbuf:%p\n", vb);
1068 
1069 	/* sanity checks */
1070 	if (vv->video_fmt.width  < 48 ||
1071 	    vv->video_fmt.height < 32 ||
1072 	    vv->video_fmt.width  > vv->standard->h_max_out ||
1073 	    vv->video_fmt.height > vv->standard->v_max_out) {
1074 		DEB_D("w (%d) / h (%d) out of bounds\n",
1075 		      vv->video_fmt.width, vv->video_fmt.height);
1076 		return -EINVAL;
1077 	}
1078 
1079 	size = vv->video_fmt.sizeimage;
1080 	if (0 != buf->vb.baddr && buf->vb.bsize < size) {
1081 		DEB_D("size mismatch\n");
1082 		return -EINVAL;
1083 	}
1084 
1085 	DEB_CAP("buffer_prepare [size=%dx%d,bytes=%d,fields=%s]\n",
1086 		vv->video_fmt.width, vv->video_fmt.height,
1087 		size, v4l2_field_names[vv->video_fmt.field]);
1088 	if (buf->vb.width  != vv->video_fmt.width  ||
1089 	    buf->vb.bytesperline != vv->video_fmt.bytesperline ||
1090 	    buf->vb.height != vv->video_fmt.height ||
1091 	    buf->vb.size   != size ||
1092 	    buf->vb.field  != field      ||
1093 	    buf->vb.field  != vv->video_fmt.field  ||
1094 	    buf->fmt       != &vv->video_fmt) {
1095 		saa7146_dma_free(dev,q,buf);
1096 	}
1097 
1098 	if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
1099 		struct saa7146_format *sfmt;
1100 
1101 		buf->vb.bytesperline  = vv->video_fmt.bytesperline;
1102 		buf->vb.width  = vv->video_fmt.width;
1103 		buf->vb.height = vv->video_fmt.height;
1104 		buf->vb.size   = size;
1105 		buf->vb.field  = field;
1106 		buf->fmt       = &vv->video_fmt;
1107 		buf->vb.field  = vv->video_fmt.field;
1108 
1109 		sfmt = saa7146_format_by_fourcc(dev,buf->fmt->pixelformat);
1110 
1111 		release_all_pagetables(dev, buf);
1112 		if( 0 != IS_PLANAR(sfmt->trans)) {
1113 			saa7146_pgtable_alloc(dev->pci, &buf->pt[0]);
1114 			saa7146_pgtable_alloc(dev->pci, &buf->pt[1]);
1115 			saa7146_pgtable_alloc(dev->pci, &buf->pt[2]);
1116 		} else {
1117 			saa7146_pgtable_alloc(dev->pci, &buf->pt[0]);
1118 		}
1119 
1120 		err = videobuf_iolock(q,&buf->vb, &vv->ov_fb);
1121 		if (err)
1122 			goto oops;
1123 		err = saa7146_pgtable_build(dev,buf);
1124 		if (err)
1125 			goto oops;
1126 	}
1127 	buf->vb.state = VIDEOBUF_PREPARED;
1128 	buf->activate = buffer_activate;
1129 
1130 	return 0;
1131 
1132  oops:
1133 	DEB_D("error out\n");
1134 	saa7146_dma_free(dev,q,buf);
1135 
1136 	return err;
1137 }
1138 
1139 static int buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
1140 {
1141 	struct file *file = q->priv_data;
1142 	struct saa7146_fh *fh = file->private_data;
1143 	struct saa7146_vv *vv = fh->dev->vv_data;
1144 
1145 	if (0 == *count || *count > MAX_SAA7146_CAPTURE_BUFFERS)
1146 		*count = MAX_SAA7146_CAPTURE_BUFFERS;
1147 
1148 	*size = vv->video_fmt.sizeimage;
1149 
1150 	/* check if we exceed the "max_memory" parameter */
1151 	if( (*count * *size) > (max_memory*1048576) ) {
1152 		*count = (max_memory*1048576) / *size;
1153 	}
1154 
1155 	DEB_CAP("%d buffers, %d bytes each\n", *count, *size);
1156 
1157 	return 0;
1158 }
1159 
1160 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
1161 {
1162 	struct file *file = q->priv_data;
1163 	struct saa7146_fh *fh = file->private_data;
1164 	struct saa7146_dev *dev = fh->dev;
1165 	struct saa7146_vv *vv = dev->vv_data;
1166 	struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1167 
1168 	DEB_CAP("vbuf:%p\n", vb);
1169 	saa7146_buffer_queue(fh->dev, &vv->video_dmaq, buf);
1170 }
1171 
1172 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
1173 {
1174 	struct file *file = q->priv_data;
1175 	struct saa7146_fh *fh = file->private_data;
1176 	struct saa7146_dev *dev = fh->dev;
1177 	struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1178 
1179 	DEB_CAP("vbuf:%p\n", vb);
1180 
1181 	saa7146_dma_free(dev,q,buf);
1182 
1183 	release_all_pagetables(dev, buf);
1184 }
1185 
1186 static struct videobuf_queue_ops video_qops = {
1187 	.buf_setup    = buffer_setup,
1188 	.buf_prepare  = buffer_prepare,
1189 	.buf_queue    = buffer_queue,
1190 	.buf_release  = buffer_release,
1191 };
1192 
1193 /********************************************************************************/
1194 /* file operations */
1195 
1196 static void video_init(struct saa7146_dev *dev, struct saa7146_vv *vv)
1197 {
1198 	INIT_LIST_HEAD(&vv->video_dmaq.queue);
1199 
1200 	init_timer(&vv->video_dmaq.timeout);
1201 	vv->video_dmaq.timeout.function = saa7146_buffer_timeout;
1202 	vv->video_dmaq.timeout.data     = (unsigned long)(&vv->video_dmaq);
1203 	vv->video_dmaq.dev              = dev;
1204 
1205 	/* set some default values */
1206 	vv->standard = &dev->ext_vv_data->stds[0];
1207 
1208 	/* FIXME: what's this? */
1209 	vv->current_hps_source = SAA7146_HPS_SOURCE_PORT_A;
1210 	vv->current_hps_sync = SAA7146_HPS_SYNC_PORT_A;
1211 }
1212 
1213 
1214 static int video_open(struct saa7146_dev *dev, struct file *file)
1215 {
1216 	struct saa7146_fh *fh = file->private_data;
1217 
1218 	videobuf_queue_sg_init(&fh->video_q, &video_qops,
1219 			    &dev->pci->dev, &dev->slock,
1220 			    V4L2_BUF_TYPE_VIDEO_CAPTURE,
1221 			    V4L2_FIELD_INTERLACED,
1222 			    sizeof(struct saa7146_buf),
1223 			    file, &dev->v4l2_lock);
1224 
1225 	return 0;
1226 }
1227 
1228 
1229 static void video_close(struct saa7146_dev *dev, struct file *file)
1230 {
1231 	struct saa7146_fh *fh = file->private_data;
1232 	struct saa7146_vv *vv = dev->vv_data;
1233 	struct videobuf_queue *q = &fh->video_q;
1234 
1235 	if (IS_CAPTURE_ACTIVE(fh) != 0)
1236 		video_end(fh, file);
1237 	else if (IS_OVERLAY_ACTIVE(fh) != 0)
1238 		saa7146_stop_preview(fh);
1239 
1240 	videobuf_stop(q);
1241 	/* hmm, why is this function declared void? */
1242 }
1243 
1244 
1245 static void video_irq_done(struct saa7146_dev *dev, unsigned long st)
1246 {
1247 	struct saa7146_vv *vv = dev->vv_data;
1248 	struct saa7146_dmaqueue *q = &vv->video_dmaq;
1249 
1250 	spin_lock(&dev->slock);
1251 	DEB_CAP("called\n");
1252 
1253 	/* only finish the buffer if we have one... */
1254 	if( NULL != q->curr ) {
1255 		saa7146_buffer_finish(dev,q,VIDEOBUF_DONE);
1256 	}
1257 	saa7146_buffer_next(dev,q,0);
1258 
1259 	spin_unlock(&dev->slock);
1260 }
1261 
1262 static ssize_t video_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
1263 {
1264 	struct saa7146_fh *fh = file->private_data;
1265 	struct saa7146_dev *dev = fh->dev;
1266 	struct saa7146_vv *vv = dev->vv_data;
1267 	ssize_t ret = 0;
1268 
1269 	DEB_EE("called\n");
1270 
1271 	if ((vv->video_status & STATUS_CAPTURE) != 0) {
1272 		/* fixme: should we allow read() captures while streaming capture? */
1273 		if (vv->video_fh == fh) {
1274 			DEB_S("already capturing\n");
1275 			return -EBUSY;
1276 		}
1277 		DEB_S("already capturing in another open\n");
1278 		return -EBUSY;
1279 	}
1280 
1281 	ret = video_begin(fh);
1282 	if( 0 != ret) {
1283 		goto out;
1284 	}
1285 
1286 	ret = videobuf_read_one(&fh->video_q , data, count, ppos,
1287 				file->f_flags & O_NONBLOCK);
1288 	if (ret != 0) {
1289 		video_end(fh, file);
1290 	} else {
1291 		ret = video_end(fh, file);
1292 	}
1293 out:
1294 	/* restart overlay if it was active before */
1295 	if (vv->ov_suspend != NULL) {
1296 		saa7146_start_preview(vv->ov_suspend);
1297 		vv->ov_suspend = NULL;
1298 	}
1299 
1300 	return ret;
1301 }
1302 
1303 struct saa7146_use_ops saa7146_video_uops = {
1304 	.init = video_init,
1305 	.open = video_open,
1306 	.release = video_close,
1307 	.irq_done = video_irq_done,
1308 	.read = video_read,
1309 };
1310