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saa7146_video.c
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1 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
2 
3 #include <media/saa7146_vv.h>
4 #include <media/v4l2-chip-ident.h>
5 #include <media/v4l2-event.h>
6 #include <media/v4l2-ctrls.h>
7 #include <linux/module.h>
8 
9 static int max_memory = 32;
10 
11 module_param(max_memory, int, 0644);
12 MODULE_PARM_DESC(max_memory, "maximum memory usage for capture buffers (default: 32Mb)");
13 
14 #define IS_CAPTURE_ACTIVE(fh) \
15  (((vv->video_status & STATUS_CAPTURE) != 0) && (vv->video_fh == fh))
16 
17 #define IS_OVERLAY_ACTIVE(fh) \
18  (((vv->video_status & STATUS_OVERLAY) != 0) && (vv->video_fh == fh))
19 
20 /* format descriptions for capture and preview */
21 static struct saa7146_format formats[] = {
22  {
23  .name = "RGB-8 (3-3-2)",
24  .pixelformat = V4L2_PIX_FMT_RGB332,
25  .trans = RGB08_COMPOSED,
26  .depth = 8,
27  .flags = 0,
28  }, {
29  .name = "RGB-16 (5/B-6/G-5/R)",
30  .pixelformat = V4L2_PIX_FMT_RGB565,
31  .trans = RGB16_COMPOSED,
32  .depth = 16,
33  .flags = 0,
34  }, {
35  .name = "RGB-24 (B-G-R)",
36  .pixelformat = V4L2_PIX_FMT_BGR24,
37  .trans = RGB24_COMPOSED,
38  .depth = 24,
39  .flags = 0,
40  }, {
41  .name = "RGB-32 (B-G-R)",
42  .pixelformat = V4L2_PIX_FMT_BGR32,
43  .trans = RGB32_COMPOSED,
44  .depth = 32,
45  .flags = 0,
46  }, {
47  .name = "RGB-32 (R-G-B)",
48  .pixelformat = V4L2_PIX_FMT_RGB32,
49  .trans = RGB32_COMPOSED,
50  .depth = 32,
51  .flags = 0,
52  .swap = 0x2,
53  }, {
54  .name = "Greyscale-8",
55  .pixelformat = V4L2_PIX_FMT_GREY,
56  .trans = Y8,
57  .depth = 8,
58  .flags = 0,
59  }, {
60  .name = "YUV 4:2:2 planar (Y-Cb-Cr)",
61  .pixelformat = V4L2_PIX_FMT_YUV422P,
62  .trans = YUV422_DECOMPOSED,
63  .depth = 16,
64  .flags = FORMAT_BYTE_SWAP|FORMAT_IS_PLANAR,
65  }, {
66  .name = "YVU 4:2:0 planar (Y-Cb-Cr)",
67  .pixelformat = V4L2_PIX_FMT_YVU420,
68  .trans = YUV420_DECOMPOSED,
69  .depth = 12,
70  .flags = FORMAT_BYTE_SWAP|FORMAT_IS_PLANAR,
71  }, {
72  .name = "YUV 4:2:0 planar (Y-Cb-Cr)",
73  .pixelformat = V4L2_PIX_FMT_YUV420,
74  .trans = YUV420_DECOMPOSED,
75  .depth = 12,
76  .flags = FORMAT_IS_PLANAR,
77  }, {
78  .name = "YUV 4:2:2 (U-Y-V-Y)",
79  .pixelformat = V4L2_PIX_FMT_UYVY,
80  .trans = YUV422_COMPOSED,
81  .depth = 16,
82  .flags = 0,
83  }
84 };
85 
86 /* unfortunately, the saa7146 contains a bug which prevents it from doing on-the-fly byte swaps.
87  due to this, it's impossible to provide additional *packed* formats, which are simply byte swapped
88  (like V4L2_PIX_FMT_YUYV) ... 8-( */
89 
90 static int NUM_FORMATS = sizeof(formats)/sizeof(struct saa7146_format);
91 
92 struct saa7146_format* saa7146_format_by_fourcc(struct saa7146_dev *dev, int fourcc)
93 {
94  int i, j = NUM_FORMATS;
95 
96  for (i = 0; i < j; i++) {
97  if (formats[i].pixelformat == fourcc) {
98  return formats+i;
99  }
100  }
101 
102  DEB_D("unknown pixelformat:'%4.4s'\n", (char *)&fourcc);
103  return NULL;
104 }
105 
106 static int vidioc_try_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f);
107 
108 int saa7146_start_preview(struct saa7146_fh *fh)
109 {
110  struct saa7146_dev *dev = fh->dev;
111  struct saa7146_vv *vv = dev->vv_data;
112  struct v4l2_format fmt;
113  int ret = 0, err = 0;
114 
115  DEB_EE("dev:%p, fh:%p\n", dev, fh);
116 
117  /* check if we have overlay information */
118  if (vv->ov.fh == NULL) {
119  DEB_D("no overlay data available. try S_FMT first.\n");
120  return -EAGAIN;
121  }
122 
123  /* check if streaming capture is running */
124  if (IS_CAPTURE_ACTIVE(fh) != 0) {
125  DEB_D("streaming capture is active\n");
126  return -EBUSY;
127  }
128 
129  /* check if overlay is running */
130  if (IS_OVERLAY_ACTIVE(fh) != 0) {
131  if (vv->video_fh == fh) {
132  DEB_D("overlay is already active\n");
133  return 0;
134  }
135  DEB_D("overlay is already active in another open\n");
136  return -EBUSY;
137  }
138 
139  if (0 == saa7146_res_get(fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP)) {
140  DEB_D("cannot get necessary overlay resources\n");
141  return -EBUSY;
142  }
143 
144  fmt.fmt.win = vv->ov.win;
145  err = vidioc_try_fmt_vid_overlay(NULL, fh, &fmt);
146  if (0 != err) {
147  saa7146_res_free(vv->video_fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
148  return -EBUSY;
149  }
150  vv->ov.win = fmt.fmt.win;
151 
152  DEB_D("%dx%d+%d+%d %s field=%s\n",
153  vv->ov.win.w.width, vv->ov.win.w.height,
154  vv->ov.win.w.left, vv->ov.win.w.top,
155  vv->ov_fmt->name, v4l2_field_names[vv->ov.win.field]);
156 
157  if (0 != (ret = saa7146_enable_overlay(fh))) {
158  DEB_D("enabling overlay failed: %d\n", ret);
159  saa7146_res_free(vv->video_fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
160  return ret;
161  }
162 
163  vv->video_status = STATUS_OVERLAY;
164  vv->video_fh = fh;
165 
166  return 0;
167 }
168 EXPORT_SYMBOL_GPL(saa7146_start_preview);
169 
170 int saa7146_stop_preview(struct saa7146_fh *fh)
171 {
172  struct saa7146_dev *dev = fh->dev;
173  struct saa7146_vv *vv = dev->vv_data;
174 
175  DEB_EE("dev:%p, fh:%p\n", dev, fh);
176 
177  /* check if streaming capture is running */
178  if (IS_CAPTURE_ACTIVE(fh) != 0) {
179  DEB_D("streaming capture is active\n");
180  return -EBUSY;
181  }
182 
183  /* check if overlay is running at all */
184  if ((vv->video_status & STATUS_OVERLAY) == 0) {
185  DEB_D("no active overlay\n");
186  return 0;
187  }
188 
189  if (vv->video_fh != fh) {
190  DEB_D("overlay is active, but in another open\n");
191  return -EBUSY;
192  }
193 
194  vv->video_status = 0;
195  vv->video_fh = NULL;
196 
197  saa7146_disable_overlay(fh);
198 
199  saa7146_res_free(fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
200 
201  return 0;
202 }
203 EXPORT_SYMBOL_GPL(saa7146_stop_preview);
204 
205 /********************************************************************************/
206 /* common pagetable functions */
207 
208 static int saa7146_pgtable_build(struct saa7146_dev *dev, struct saa7146_buf *buf)
209 {
210  struct pci_dev *pci = dev->pci;
211  struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
212  struct scatterlist *list = dma->sglist;
213  int length = dma->sglen;
214  struct saa7146_format *sfmt = saa7146_format_by_fourcc(dev,buf->fmt->pixelformat);
215 
216  DEB_EE("dev:%p, buf:%p, sg_len:%d\n", dev, buf, length);
217 
218  if( 0 != IS_PLANAR(sfmt->trans)) {
219  struct saa7146_pgtable *pt1 = &buf->pt[0];
220  struct saa7146_pgtable *pt2 = &buf->pt[1];
221  struct saa7146_pgtable *pt3 = &buf->pt[2];
222  __le32 *ptr1, *ptr2, *ptr3;
223  __le32 fill;
224 
225  int size = buf->fmt->width*buf->fmt->height;
226  int i,p,m1,m2,m3,o1,o2;
227 
228  switch( sfmt->depth ) {
229  case 12: {
230  /* create some offsets inside the page table */
231  m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
232  m2 = ((size+(size/4)+PAGE_SIZE)/PAGE_SIZE)-1;
233  m3 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
234  o1 = size%PAGE_SIZE;
235  o2 = (size+(size/4))%PAGE_SIZE;
236  DEB_CAP("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",
237  size, m1, m2, m3, o1, o2);
238  break;
239  }
240  case 16: {
241  /* create some offsets inside the page table */
242  m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
243  m2 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
244  m3 = ((2*size+PAGE_SIZE)/PAGE_SIZE)-1;
245  o1 = size%PAGE_SIZE;
246  o2 = (size+(size/2))%PAGE_SIZE;
247  DEB_CAP("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",
248  size, m1, m2, m3, o1, o2);
249  break;
250  }
251  default: {
252  return -1;
253  }
254  }
255 
256  ptr1 = pt1->cpu;
257  ptr2 = pt2->cpu;
258  ptr3 = pt3->cpu;
259 
260  /* walk all pages, copy all page addresses to ptr1 */
261  for (i = 0; i < length; i++, list++) {
262  for (p = 0; p * 4096 < list->length; p++, ptr1++) {
263  *ptr1 = cpu_to_le32(sg_dma_address(list) - list->offset);
264  }
265  }
266 /*
267  ptr1 = pt1->cpu;
268  for(j=0;j<40;j++) {
269  printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
270  }
271 */
272 
273  /* if we have a user buffer, the first page may not be
274  aligned to a page boundary. */
275  pt1->offset = dma->sglist->offset;
276  pt2->offset = pt1->offset+o1;
277  pt3->offset = pt1->offset+o2;
278 
279  /* create video-dma2 page table */
280  ptr1 = pt1->cpu;
281  for(i = m1; i <= m2 ; i++, ptr2++) {
282  *ptr2 = ptr1[i];
283  }
284  fill = *(ptr2-1);
285  for(;i<1024;i++,ptr2++) {
286  *ptr2 = fill;
287  }
288  /* create video-dma3 page table */
289  ptr1 = pt1->cpu;
290  for(i = m2; i <= m3; i++,ptr3++) {
291  *ptr3 = ptr1[i];
292  }
293  fill = *(ptr3-1);
294  for(;i<1024;i++,ptr3++) {
295  *ptr3 = fill;
296  }
297  /* finally: finish up video-dma1 page table */
298  ptr1 = pt1->cpu+m1;
299  fill = pt1->cpu[m1];
300  for(i=m1;i<1024;i++,ptr1++) {
301  *ptr1 = fill;
302  }
303 /*
304  ptr1 = pt1->cpu;
305  ptr2 = pt2->cpu;
306  ptr3 = pt3->cpu;
307  for(j=0;j<40;j++) {
308  printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
309  }
310  for(j=0;j<40;j++) {
311  printk("ptr2 %d: 0x%08x\n",j,ptr2[j]);
312  }
313  for(j=0;j<40;j++) {
314  printk("ptr3 %d: 0x%08x\n",j,ptr3[j]);
315  }
316 */
317  } else {
318  struct saa7146_pgtable *pt = &buf->pt[0];
319  return saa7146_pgtable_build_single(pci, pt, list, length);
320  }
321 
322  return 0;
323 }
324 
325 
326 /********************************************************************************/
327 /* file operations */
328 
329 static int video_begin(struct saa7146_fh *fh)
330 {
331  struct saa7146_dev *dev = fh->dev;
332  struct saa7146_vv *vv = dev->vv_data;
333  struct saa7146_format *fmt = NULL;
334  unsigned int resource;
335  int ret = 0, err = 0;
336 
337  DEB_EE("dev:%p, fh:%p\n", dev, fh);
338 
339  if ((vv->video_status & STATUS_CAPTURE) != 0) {
340  if (vv->video_fh == fh) {
341  DEB_S("already capturing\n");
342  return 0;
343  }
344  DEB_S("already capturing in another open\n");
345  return -EBUSY;
346  }
347 
348  if ((vv->video_status & STATUS_OVERLAY) != 0) {
349  DEB_S("warning: suspending overlay video for streaming capture\n");
350  vv->ov_suspend = vv->video_fh;
351  err = saa7146_stop_preview(vv->video_fh); /* side effect: video_status is now 0, video_fh is NULL */
352  if (0 != err) {
353  DEB_D("suspending video failed. aborting\n");
354  return err;
355  }
356  }
357 
358  fmt = saa7146_format_by_fourcc(dev, vv->video_fmt.pixelformat);
359  /* we need to have a valid format set here */
360  BUG_ON(NULL == fmt);
361 
362  if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
363  resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
364  } else {
365  resource = RESOURCE_DMA1_HPS;
366  }
367 
368  ret = saa7146_res_get(fh, resource);
369  if (0 == ret) {
370  DEB_S("cannot get capture resource %d\n", resource);
371  if (vv->ov_suspend != NULL) {
372  saa7146_start_preview(vv->ov_suspend);
373  vv->ov_suspend = NULL;
374  }
375  return -EBUSY;
376  }
377 
378  /* clear out beginning of streaming bit (rps register 0)*/
379  saa7146_write(dev, MC2, MASK_27 );
380 
381  /* enable rps0 irqs */
382  SAA7146_IER_ENABLE(dev, MASK_27);
383 
384  vv->video_fh = fh;
385  vv->video_status = STATUS_CAPTURE;
386 
387  return 0;
388 }
389 
390 static int video_end(struct saa7146_fh *fh, struct file *file)
391 {
392  struct saa7146_dev *dev = fh->dev;
393  struct saa7146_vv *vv = dev->vv_data;
394  struct saa7146_format *fmt = NULL;
395  unsigned long flags;
396  unsigned int resource;
397  u32 dmas = 0;
398  DEB_EE("dev:%p, fh:%p\n", dev, fh);
399 
400  if ((vv->video_status & STATUS_CAPTURE) != STATUS_CAPTURE) {
401  DEB_S("not capturing\n");
402  return 0;
403  }
404 
405  if (vv->video_fh != fh) {
406  DEB_S("capturing, but in another open\n");
407  return -EBUSY;
408  }
409 
410  fmt = saa7146_format_by_fourcc(dev, vv->video_fmt.pixelformat);
411  /* we need to have a valid format set here */
412  BUG_ON(NULL == fmt);
413 
414  if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
415  resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
416  dmas = MASK_22 | MASK_21 | MASK_20;
417  } else {
418  resource = RESOURCE_DMA1_HPS;
419  dmas = MASK_22;
420  }
421  spin_lock_irqsave(&dev->slock,flags);
422 
423  /* disable rps0 */
424  saa7146_write(dev, MC1, MASK_28);
425 
426  /* disable rps0 irqs */
427  SAA7146_IER_DISABLE(dev, MASK_27);
428 
429  /* shut down all used video dma transfers */
430  saa7146_write(dev, MC1, dmas);
431 
432  spin_unlock_irqrestore(&dev->slock, flags);
433 
434  vv->video_fh = NULL;
435  vv->video_status = 0;
436 
437  saa7146_res_free(fh, resource);
438 
439  if (vv->ov_suspend != NULL) {
440  saa7146_start_preview(vv->ov_suspend);
441  vv->ov_suspend = NULL;
442  }
443 
444  return 0;
445 }
446 
447 static int vidioc_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
448 {
449  struct video_device *vdev = video_devdata(file);
450  struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
451 
452  strcpy((char *)cap->driver, "saa7146 v4l2");
453  strlcpy((char *)cap->card, dev->ext->name, sizeof(cap->card));
454  sprintf((char *)cap->bus_info, "PCI:%s", pci_name(dev->pci));
455  cap->device_caps =
456  V4L2_CAP_VIDEO_CAPTURE |
457  V4L2_CAP_VIDEO_OVERLAY |
458  V4L2_CAP_READWRITE |
459  V4L2_CAP_STREAMING;
460  cap->device_caps |= dev->ext_vv_data->capabilities;
461  cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
462  if (vdev->vfl_type == VFL_TYPE_GRABBER)
463  cap->device_caps &=
464  ~(V4L2_CAP_VBI_CAPTURE | V4L2_CAP_SLICED_VBI_OUTPUT);
465  else
466  cap->device_caps &=
467  ~(V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OVERLAY | V4L2_CAP_AUDIO);
468  return 0;
469 }
470 
471 static int vidioc_g_fbuf(struct file *file, void *fh, struct v4l2_framebuffer *fb)
472 {
473  struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
474  struct saa7146_vv *vv = dev->vv_data;
475 
476  *fb = vv->ov_fb;
477  fb->capability = V4L2_FBUF_CAP_LIST_CLIPPING;
478  fb->flags = V4L2_FBUF_FLAG_PRIMARY;
479  return 0;
480 }
481 
482 static int vidioc_s_fbuf(struct file *file, void *fh, const struct v4l2_framebuffer *fb)
483 {
484  struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
485  struct saa7146_vv *vv = dev->vv_data;
486  struct saa7146_format *fmt;
487 
488  DEB_EE("VIDIOC_S_FBUF\n");
489 
490  if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
491  return -EPERM;
492 
493  /* check args */
494  fmt = saa7146_format_by_fourcc(dev, fb->fmt.pixelformat);
495  if (NULL == fmt)
496  return -EINVAL;
497 
498  /* planar formats are not allowed for overlay video, clipping and video dma would clash */
499  if (fmt->flags & FORMAT_IS_PLANAR)
500  DEB_S("planar pixelformat '%4.4s' not allowed for overlay\n",
501  (char *)&fmt->pixelformat);
502 
503  /* check if overlay is running */
504  if (IS_OVERLAY_ACTIVE(fh) != 0) {
505  if (vv->video_fh != fh) {
506  DEB_D("refusing to change framebuffer informations while overlay is active in another open\n");
507  return -EBUSY;
508  }
509  }
510 
511  /* ok, accept it */
512  vv->ov_fb = *fb;
513  vv->ov_fmt = fmt;
514 
515  if (vv->ov_fb.fmt.bytesperline < vv->ov_fb.fmt.width) {
516  vv->ov_fb.fmt.bytesperline = vv->ov_fb.fmt.width * fmt->depth / 8;
517  DEB_D("setting bytesperline to %d\n", vv->ov_fb.fmt.bytesperline);
518  }
519  return 0;
520 }
521 
522 static int vidioc_enum_fmt_vid_cap(struct file *file, void *fh, struct v4l2_fmtdesc *f)
523 {
524  if (f->index >= NUM_FORMATS)
525  return -EINVAL;
526  strlcpy((char *)f->description, formats[f->index].name,
527  sizeof(f->description));
528  f->pixelformat = formats[f->index].pixelformat;
529  return 0;
530 }
531 
532 int saa7146_s_ctrl(struct v4l2_ctrl *ctrl)
533 {
534  struct saa7146_dev *dev = container_of(ctrl->handler,
535  struct saa7146_dev, ctrl_handler);
536  struct saa7146_vv *vv = dev->vv_data;
537  u32 val;
538 
539  switch (ctrl->id) {
540  case V4L2_CID_BRIGHTNESS:
541  val = saa7146_read(dev, BCS_CTRL);
542  val &= 0x00ffffff;
543  val |= (ctrl->val << 24);
544  saa7146_write(dev, BCS_CTRL, val);
545  saa7146_write(dev, MC2, MASK_22 | MASK_06);
546  break;
547 
548  case V4L2_CID_CONTRAST:
549  val = saa7146_read(dev, BCS_CTRL);
550  val &= 0xff00ffff;
551  val |= (ctrl->val << 16);
552  saa7146_write(dev, BCS_CTRL, val);
553  saa7146_write(dev, MC2, MASK_22 | MASK_06);
554  break;
555 
556  case V4L2_CID_SATURATION:
557  val = saa7146_read(dev, BCS_CTRL);
558  val &= 0xffffff00;
559  val |= (ctrl->val << 0);
560  saa7146_write(dev, BCS_CTRL, val);
561  saa7146_write(dev, MC2, MASK_22 | MASK_06);
562  break;
563 
564  case V4L2_CID_HFLIP:
565  /* fixme: we can support changing VFLIP and HFLIP here... */
566  if ((vv->video_status & STATUS_CAPTURE))
567  return -EBUSY;
568  vv->hflip = ctrl->val;
569  break;
570 
571  case V4L2_CID_VFLIP:
572  if ((vv->video_status & STATUS_CAPTURE))
573  return -EBUSY;
574  vv->vflip = ctrl->val;
575  break;
576 
577  default:
578  return -EINVAL;
579  }
580 
581  if ((vv->video_status & STATUS_OVERLAY) != 0) { /* CHECK: && (vv->video_fh == fh)) */
582  struct saa7146_fh *fh = vv->video_fh;
583 
584  saa7146_stop_preview(fh);
585  saa7146_start_preview(fh);
586  }
587  return 0;
588 }
589 
590 static int vidioc_g_parm(struct file *file, void *fh,
591  struct v4l2_streamparm *parm)
592 {
593  struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
594  struct saa7146_vv *vv = dev->vv_data;
595 
596  if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
597  return -EINVAL;
598  parm->parm.capture.readbuffers = 1;
599  v4l2_video_std_frame_period(vv->standard->id,
600  &parm->parm.capture.timeperframe);
601  return 0;
602 }
603 
604 static int vidioc_g_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f)
605 {
606  struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
607  struct saa7146_vv *vv = dev->vv_data;
608 
609  f->fmt.pix = vv->video_fmt;
610  return 0;
611 }
612 
613 static int vidioc_g_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f)
614 {
615  struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
616  struct saa7146_vv *vv = dev->vv_data;
617 
618  f->fmt.win = vv->ov.win;
619  return 0;
620 }
621 
622 static int vidioc_g_fmt_vbi_cap(struct file *file, void *fh, struct v4l2_format *f)
623 {
624  struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
625  struct saa7146_vv *vv = dev->vv_data;
626 
627  f->fmt.vbi = vv->vbi_fmt;
628  return 0;
629 }
630 
631 static int vidioc_try_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f)
632 {
633  struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
634  struct saa7146_vv *vv = dev->vv_data;
635  struct saa7146_format *fmt;
636  enum v4l2_field field;
637  int maxw, maxh;
638  int calc_bpl;
639 
640  DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: dev:%p, fh:%p\n", dev, fh);
641 
642  fmt = saa7146_format_by_fourcc(dev, f->fmt.pix.pixelformat);
643  if (NULL == fmt)
644  return -EINVAL;
645 
646  field = f->fmt.pix.field;
647  maxw = vv->standard->h_max_out;
648  maxh = vv->standard->v_max_out;
649 
650  if (V4L2_FIELD_ANY == field) {
651  field = (f->fmt.pix.height > maxh / 2)
652  ? V4L2_FIELD_INTERLACED
653  : V4L2_FIELD_BOTTOM;
654  }
655  switch (field) {
656  case V4L2_FIELD_ALTERNATE:
657  vv->last_field = V4L2_FIELD_TOP;
658  maxh = maxh / 2;
659  break;
660  case V4L2_FIELD_TOP:
661  case V4L2_FIELD_BOTTOM:
662  vv->last_field = V4L2_FIELD_INTERLACED;
663  maxh = maxh / 2;
664  break;
665  case V4L2_FIELD_INTERLACED:
666  vv->last_field = V4L2_FIELD_INTERLACED;
667  break;
668  default:
669  DEB_D("no known field mode '%d'\n", field);
670  return -EINVAL;
671  }
672 
673  f->fmt.pix.field = field;
674  f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
675  if (f->fmt.pix.width > maxw)
676  f->fmt.pix.width = maxw;
677  if (f->fmt.pix.height > maxh)
678  f->fmt.pix.height = maxh;
679 
680  calc_bpl = (f->fmt.pix.width * fmt->depth) / 8;
681 
682  if (f->fmt.pix.bytesperline < calc_bpl)
683  f->fmt.pix.bytesperline = calc_bpl;
684 
685  if (f->fmt.pix.bytesperline > (2 * PAGE_SIZE * fmt->depth) / 8) /* arbitrary constraint */
686  f->fmt.pix.bytesperline = calc_bpl;
687 
688  f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * f->fmt.pix.height;
689  DEB_D("w:%d, h:%d, bytesperline:%d, sizeimage:%d\n",
690  f->fmt.pix.width, f->fmt.pix.height,
691  f->fmt.pix.bytesperline, f->fmt.pix.sizeimage);
692 
693  return 0;
694 }
695 
696 
697 static int vidioc_try_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f)
698 {
699  struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
700  struct saa7146_vv *vv = dev->vv_data;
701  struct v4l2_window *win = &f->fmt.win;
702  enum v4l2_field field;
703  int maxw, maxh;
704 
705  DEB_EE("dev:%p\n", dev);
706 
707  if (NULL == vv->ov_fb.base) {
708  DEB_D("no fb base set\n");
709  return -EINVAL;
710  }
711  if (NULL == vv->ov_fmt) {
712  DEB_D("no fb fmt set\n");
713  return -EINVAL;
714  }
715  if (win->w.width < 48 || win->w.height < 32) {
716  DEB_D("min width/height. (%d,%d)\n",
717  win->w.width, win->w.height);
718  return -EINVAL;
719  }
720  if (win->clipcount > 16) {
721  DEB_D("clipcount too big\n");
722  return -EINVAL;
723  }
724 
725  field = win->field;
726  maxw = vv->standard->h_max_out;
727  maxh = vv->standard->v_max_out;
728 
729  if (V4L2_FIELD_ANY == field) {
730  field = (win->w.height > maxh / 2)
731  ? V4L2_FIELD_INTERLACED
732  : V4L2_FIELD_TOP;
733  }
734  switch (field) {
735  case V4L2_FIELD_TOP:
736  case V4L2_FIELD_BOTTOM:
737  case V4L2_FIELD_ALTERNATE:
738  maxh = maxh / 2;
739  break;
740  case V4L2_FIELD_INTERLACED:
741  break;
742  default:
743  DEB_D("no known field mode '%d'\n", field);
744  return -EINVAL;
745  }
746 
747  win->field = field;
748  if (win->w.width > maxw)
749  win->w.width = maxw;
750  if (win->w.height > maxh)
751  win->w.height = maxh;
752 
753  return 0;
754 }
755 
756 static int vidioc_s_fmt_vid_cap(struct file *file, void *__fh, struct v4l2_format *f)
757 {
758  struct saa7146_fh *fh = __fh;
759  struct saa7146_dev *dev = fh->dev;
760  struct saa7146_vv *vv = dev->vv_data;
761  int err;
762 
763  DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: dev:%p, fh:%p\n", dev, fh);
764  if (IS_CAPTURE_ACTIVE(fh) != 0) {
765  DEB_EE("streaming capture is active\n");
766  return -EBUSY;
767  }
768  err = vidioc_try_fmt_vid_cap(file, fh, f);
769  if (0 != err)
770  return err;
771  vv->video_fmt = f->fmt.pix;
772  DEB_EE("set to pixelformat '%4.4s'\n",
773  (char *)&vv->video_fmt.pixelformat);
774  return 0;
775 }
776 
777 static int vidioc_s_fmt_vid_overlay(struct file *file, void *__fh, struct v4l2_format *f)
778 {
779  struct saa7146_fh *fh = __fh;
780  struct saa7146_dev *dev = fh->dev;
781  struct saa7146_vv *vv = dev->vv_data;
782  int err;
783 
784  DEB_EE("V4L2_BUF_TYPE_VIDEO_OVERLAY: dev:%p, fh:%p\n", dev, fh);
785  err = vidioc_try_fmt_vid_overlay(file, fh, f);
786  if (0 != err)
787  return err;
788  vv->ov.win = f->fmt.win;
789  vv->ov.nclips = f->fmt.win.clipcount;
790  if (vv->ov.nclips > 16)
791  vv->ov.nclips = 16;
792  if (copy_from_user(vv->ov.clips, f->fmt.win.clips,
793  sizeof(struct v4l2_clip) * vv->ov.nclips)) {
794  return -EFAULT;
795  }
796 
797  /* vv->ov.fh is used to indicate that we have valid overlay informations, too */
798  vv->ov.fh = fh;
799 
800  /* check if our current overlay is active */
801  if (IS_OVERLAY_ACTIVE(fh) != 0) {
802  saa7146_stop_preview(fh);
803  saa7146_start_preview(fh);
804  }
805  return 0;
806 }
807 
808 static int vidioc_g_std(struct file *file, void *fh, v4l2_std_id *norm)
809 {
810  struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
811  struct saa7146_vv *vv = dev->vv_data;
812 
813  *norm = vv->standard->id;
814  return 0;
815 }
816 
817  /* the saa7146 supfhrts (used in conjunction with the saa7111a for example)
818  PAL / NTSC / SECAM. if your hardware does not (or does more)
819  -- override this function in your extension */
820 /*
821  case VIDIOC_ENUMSTD:
822  {
823  struct v4l2_standard *e = arg;
824  if (e->index < 0 )
825  return -EINVAL;
826  if( e->index < dev->ext_vv_data->num_stds ) {
827  DEB_EE("VIDIOC_ENUMSTD: index:%d\n", e->index);
828  v4l2_video_std_construct(e, dev->ext_vv_data->stds[e->index].id, dev->ext_vv_data->stds[e->index].name);
829  return 0;
830  }
831  return -EINVAL;
832  }
833  */
834 
835 static int vidioc_s_std(struct file *file, void *fh, v4l2_std_id *id)
836 {
837  struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
838  struct saa7146_vv *vv = dev->vv_data;
839  int found = 0;
840  int err, i;
841 
842  DEB_EE("VIDIOC_S_STD\n");
843 
844  if ((vv->video_status & STATUS_CAPTURE) == STATUS_CAPTURE) {
845  DEB_D("cannot change video standard while streaming capture is active\n");
846  return -EBUSY;
847  }
848 
849  if ((vv->video_status & STATUS_OVERLAY) != 0) {
850  vv->ov_suspend = vv->video_fh;
851  err = saa7146_stop_preview(vv->video_fh); /* side effect: video_status is now 0, video_fh is NULL */
852  if (0 != err) {
853  DEB_D("suspending video failed. aborting\n");
854  return err;
855  }
856  }
857 
858  for (i = 0; i < dev->ext_vv_data->num_stds; i++)
859  if (*id & dev->ext_vv_data->stds[i].id)
860  break;
861  if (i != dev->ext_vv_data->num_stds) {
862  vv->standard = &dev->ext_vv_data->stds[i];
863  if (NULL != dev->ext_vv_data->std_callback)
864  dev->ext_vv_data->std_callback(dev, vv->standard);
865  found = 1;
866  }
867 
868  if (vv->ov_suspend != NULL) {
869  saa7146_start_preview(vv->ov_suspend);
870  vv->ov_suspend = NULL;
871  }
872 
873  if (!found) {
874  DEB_EE("VIDIOC_S_STD: standard not found\n");
875  return -EINVAL;
876  }
877 
878  DEB_EE("VIDIOC_S_STD: set to standard to '%s'\n", vv->standard->name);
879  return 0;
880 }
881 
882 static int vidioc_overlay(struct file *file, void *fh, unsigned int on)
883 {
884  int err;
885 
886  DEB_D("VIDIOC_OVERLAY on:%d\n", on);
887  if (on)
888  err = saa7146_start_preview(fh);
889  else
890  err = saa7146_stop_preview(fh);
891  return err;
892 }
893 
894 static int vidioc_reqbufs(struct file *file, void *__fh, struct v4l2_requestbuffers *b)
895 {
896  struct saa7146_fh *fh = __fh;
897 
898  if (b->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
899  return videobuf_reqbufs(&fh->video_q, b);
900  if (b->type == V4L2_BUF_TYPE_VBI_CAPTURE)
901  return videobuf_reqbufs(&fh->vbi_q, b);
902  return -EINVAL;
903 }
904 
905 static int vidioc_querybuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
906 {
907  struct saa7146_fh *fh = __fh;
908 
909  if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
910  return videobuf_querybuf(&fh->video_q, buf);
911  if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
912  return videobuf_querybuf(&fh->vbi_q, buf);
913  return -EINVAL;
914 }
915 
916 static int vidioc_qbuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
917 {
918  struct saa7146_fh *fh = __fh;
919 
920  if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
921  return videobuf_qbuf(&fh->video_q, buf);
922  if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
923  return videobuf_qbuf(&fh->vbi_q, buf);
924  return -EINVAL;
925 }
926 
927 static int vidioc_dqbuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
928 {
929  struct saa7146_fh *fh = __fh;
930 
931  if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
932  return videobuf_dqbuf(&fh->video_q, buf, file->f_flags & O_NONBLOCK);
933  if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
934  return videobuf_dqbuf(&fh->vbi_q, buf, file->f_flags & O_NONBLOCK);
935  return -EINVAL;
936 }
937 
938 static int vidioc_streamon(struct file *file, void *__fh, enum v4l2_buf_type type)
939 {
940  struct saa7146_fh *fh = __fh;
941  int err;
942 
943  DEB_D("VIDIOC_STREAMON, type:%d\n", type);
944 
945  err = video_begin(fh);
946  if (err)
947  return err;
948  if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
949  return videobuf_streamon(&fh->video_q);
950  if (type == V4L2_BUF_TYPE_VBI_CAPTURE)
951  return videobuf_streamon(&fh->vbi_q);
952  return -EINVAL;
953 }
954 
955 static int vidioc_streamoff(struct file *file, void *__fh, enum v4l2_buf_type type)
956 {
957  struct saa7146_fh *fh = __fh;
958  struct saa7146_dev *dev = fh->dev;
959  struct saa7146_vv *vv = dev->vv_data;
960  int err;
961 
962  DEB_D("VIDIOC_STREAMOFF, type:%d\n", type);
963 
964  /* ugly: we need to copy some checks from video_end(),
965  because videobuf_streamoff() relies on the capture running.
966  check and fix this */
967  if ((vv->video_status & STATUS_CAPTURE) != STATUS_CAPTURE) {
968  DEB_S("not capturing\n");
969  return 0;
970  }
971 
972  if (vv->video_fh != fh) {
973  DEB_S("capturing, but in another open\n");
974  return -EBUSY;
975  }
976 
977  err = -EINVAL;
978  if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
979  err = videobuf_streamoff(&fh->video_q);
980  else if (type == V4L2_BUF_TYPE_VBI_CAPTURE)
981  err = videobuf_streamoff(&fh->vbi_q);
982  if (0 != err) {
983  DEB_D("warning: videobuf_streamoff() failed\n");
984  video_end(fh, file);
985  } else {
986  err = video_end(fh, file);
987  }
988  return err;
989 }
990 
991 static int vidioc_g_chip_ident(struct file *file, void *__fh,
992  struct v4l2_dbg_chip_ident *chip)
993 {
994  struct saa7146_fh *fh = __fh;
995  struct saa7146_dev *dev = fh->dev;
996 
997  chip->ident = V4L2_IDENT_NONE;
998  chip->revision = 0;
999  if (chip->match.type == V4L2_CHIP_MATCH_HOST) {
1000  if (v4l2_chip_match_host(&chip->match))
1001  chip->ident = V4L2_IDENT_SAA7146;
1002  return 0;
1003  }
1004  if (chip->match.type != V4L2_CHIP_MATCH_I2C_DRIVER &&
1005  chip->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
1006  return -EINVAL;
1007  return v4l2_device_call_until_err(&dev->v4l2_dev, 0,
1008  core, g_chip_ident, chip);
1009 }
1010 
1011 const struct v4l2_ioctl_ops saa7146_video_ioctl_ops = {
1012  .vidioc_querycap = vidioc_querycap,
1013  .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1014  .vidioc_enum_fmt_vid_overlay = vidioc_enum_fmt_vid_cap,
1015  .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1016  .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1017  .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1018  .vidioc_g_fmt_vid_overlay = vidioc_g_fmt_vid_overlay,
1019  .vidioc_try_fmt_vid_overlay = vidioc_try_fmt_vid_overlay,
1020  .vidioc_s_fmt_vid_overlay = vidioc_s_fmt_vid_overlay,
1021  .vidioc_g_chip_ident = vidioc_g_chip_ident,
1022 
1023  .vidioc_overlay = vidioc_overlay,
1024  .vidioc_g_fbuf = vidioc_g_fbuf,
1025  .vidioc_s_fbuf = vidioc_s_fbuf,
1026  .vidioc_reqbufs = vidioc_reqbufs,
1027  .vidioc_querybuf = vidioc_querybuf,
1028  .vidioc_qbuf = vidioc_qbuf,
1029  .vidioc_dqbuf = vidioc_dqbuf,
1030  .vidioc_g_std = vidioc_g_std,
1031  .vidioc_s_std = vidioc_s_std,
1032  .vidioc_streamon = vidioc_streamon,
1033  .vidioc_streamoff = vidioc_streamoff,
1034  .vidioc_g_parm = vidioc_g_parm,
1035  .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
1036  .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1037 };
1038 
1039 const struct v4l2_ioctl_ops saa7146_vbi_ioctl_ops = {
1040  .vidioc_querycap = vidioc_querycap,
1041  .vidioc_g_fmt_vbi_cap = vidioc_g_fmt_vbi_cap,
1042  .vidioc_g_chip_ident = vidioc_g_chip_ident,
1043 
1044  .vidioc_reqbufs = vidioc_reqbufs,
1045  .vidioc_querybuf = vidioc_querybuf,
1046  .vidioc_qbuf = vidioc_qbuf,
1047  .vidioc_dqbuf = vidioc_dqbuf,
1048  .vidioc_g_std = vidioc_g_std,
1049  .vidioc_s_std = vidioc_s_std,
1050  .vidioc_streamon = vidioc_streamon,
1051  .vidioc_streamoff = vidioc_streamoff,
1052  .vidioc_g_parm = vidioc_g_parm,
1053  .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
1054  .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1055 };
1056 
1057 /*********************************************************************************/
1058 /* buffer handling functions */
1059 
1060 static int buffer_activate (struct saa7146_dev *dev,
1061  struct saa7146_buf *buf,
1062  struct saa7146_buf *next)
1063 {
1064  struct saa7146_vv *vv = dev->vv_data;
1065 
1066  buf->vb.state = VIDEOBUF_ACTIVE;
1067  saa7146_set_capture(dev,buf,next);
1068 
1069  mod_timer(&vv->video_dmaq.timeout, jiffies+BUFFER_TIMEOUT);
1070  return 0;
1071 }
1072 
1073 static void release_all_pagetables(struct saa7146_dev *dev, struct saa7146_buf *buf)
1074 {
1075  saa7146_pgtable_free(dev->pci, &buf->pt[0]);
1076  saa7146_pgtable_free(dev->pci, &buf->pt[1]);
1077  saa7146_pgtable_free(dev->pci, &buf->pt[2]);
1078 }
1079 
1080 static int buffer_prepare(struct videobuf_queue *q,
1081  struct videobuf_buffer *vb, enum v4l2_field field)
1082 {
1083  struct file *file = q->priv_data;
1084  struct saa7146_fh *fh = file->private_data;
1085  struct saa7146_dev *dev = fh->dev;
1086  struct saa7146_vv *vv = dev->vv_data;
1087  struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1088  int size,err = 0;
1089 
1090  DEB_CAP("vbuf:%p\n", vb);
1091 
1092  /* sanity checks */
1093  if (vv->video_fmt.width < 48 ||
1094  vv->video_fmt.height < 32 ||
1095  vv->video_fmt.width > vv->standard->h_max_out ||
1096  vv->video_fmt.height > vv->standard->v_max_out) {
1097  DEB_D("w (%d) / h (%d) out of bounds\n",
1098  vv->video_fmt.width, vv->video_fmt.height);
1099  return -EINVAL;
1100  }
1101 
1102  size = vv->video_fmt.sizeimage;
1103  if (0 != buf->vb.baddr && buf->vb.bsize < size) {
1104  DEB_D("size mismatch\n");
1105  return -EINVAL;
1106  }
1107 
1108  DEB_CAP("buffer_prepare [size=%dx%d,bytes=%d,fields=%s]\n",
1109  vv->video_fmt.width, vv->video_fmt.height,
1110  size, v4l2_field_names[vv->video_fmt.field]);
1111  if (buf->vb.width != vv->video_fmt.width ||
1112  buf->vb.bytesperline != vv->video_fmt.bytesperline ||
1113  buf->vb.height != vv->video_fmt.height ||
1114  buf->vb.size != size ||
1115  buf->vb.field != field ||
1116  buf->vb.field != vv->video_fmt.field ||
1117  buf->fmt != &vv->video_fmt) {
1118  saa7146_dma_free(dev,q,buf);
1119  }
1120 
1121  if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
1122  struct saa7146_format *sfmt;
1123 
1124  buf->vb.bytesperline = vv->video_fmt.bytesperline;
1125  buf->vb.width = vv->video_fmt.width;
1126  buf->vb.height = vv->video_fmt.height;
1127  buf->vb.size = size;
1128  buf->vb.field = field;
1129  buf->fmt = &vv->video_fmt;
1130  buf->vb.field = vv->video_fmt.field;
1131 
1132  sfmt = saa7146_format_by_fourcc(dev,buf->fmt->pixelformat);
1133 
1134  release_all_pagetables(dev, buf);
1135  if( 0 != IS_PLANAR(sfmt->trans)) {
1136  saa7146_pgtable_alloc(dev->pci, &buf->pt[0]);
1137  saa7146_pgtable_alloc(dev->pci, &buf->pt[1]);
1138  saa7146_pgtable_alloc(dev->pci, &buf->pt[2]);
1139  } else {
1140  saa7146_pgtable_alloc(dev->pci, &buf->pt[0]);
1141  }
1142 
1143  err = videobuf_iolock(q,&buf->vb, &vv->ov_fb);
1144  if (err)
1145  goto oops;
1146  err = saa7146_pgtable_build(dev,buf);
1147  if (err)
1148  goto oops;
1149  }
1150  buf->vb.state = VIDEOBUF_PREPARED;
1151  buf->activate = buffer_activate;
1152 
1153  return 0;
1154 
1155  oops:
1156  DEB_D("error out\n");
1157  saa7146_dma_free(dev,q,buf);
1158 
1159  return err;
1160 }
1161 
1162 static int buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
1163 {
1164  struct file *file = q->priv_data;
1165  struct saa7146_fh *fh = file->private_data;
1166  struct saa7146_vv *vv = fh->dev->vv_data;
1167 
1168  if (0 == *count || *count > MAX_SAA7146_CAPTURE_BUFFERS)
1169  *count = MAX_SAA7146_CAPTURE_BUFFERS;
1170 
1171  *size = vv->video_fmt.sizeimage;
1172 
1173  /* check if we exceed the "max_memory" parameter */
1174  if( (*count * *size) > (max_memory*1048576) ) {
1175  *count = (max_memory*1048576) / *size;
1176  }
1177 
1178  DEB_CAP("%d buffers, %d bytes each\n", *count, *size);
1179 
1180  return 0;
1181 }
1182 
1183 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
1184 {
1185  struct file *file = q->priv_data;
1186  struct saa7146_fh *fh = file->private_data;
1187  struct saa7146_dev *dev = fh->dev;
1188  struct saa7146_vv *vv = dev->vv_data;
1189  struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1190 
1191  DEB_CAP("vbuf:%p\n", vb);
1192  saa7146_buffer_queue(fh->dev, &vv->video_dmaq, buf);
1193 }
1194 
1195 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
1196 {
1197  struct file *file = q->priv_data;
1198  struct saa7146_fh *fh = file->private_data;
1199  struct saa7146_dev *dev = fh->dev;
1200  struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1201 
1202  DEB_CAP("vbuf:%p\n", vb);
1203 
1204  saa7146_dma_free(dev,q,buf);
1205 
1206  release_all_pagetables(dev, buf);
1207 }
1208 
1209 static struct videobuf_queue_ops video_qops = {
1210  .buf_setup = buffer_setup,
1211  .buf_prepare = buffer_prepare,
1212  .buf_queue = buffer_queue,
1213  .buf_release = buffer_release,
1214 };
1215 
1216 /********************************************************************************/
1217 /* file operations */
1218 
1219 static void video_init(struct saa7146_dev *dev, struct saa7146_vv *vv)
1220 {
1221  INIT_LIST_HEAD(&vv->video_dmaq.queue);
1222 
1223  init_timer(&vv->video_dmaq.timeout);
1224  vv->video_dmaq.timeout.function = saa7146_buffer_timeout;
1225  vv->video_dmaq.timeout.data = (unsigned long)(&vv->video_dmaq);
1226  vv->video_dmaq.dev = dev;
1227 
1228  /* set some default values */
1229  vv->standard = &dev->ext_vv_data->stds[0];
1230 
1231  /* FIXME: what's this? */
1232  vv->current_hps_source = SAA7146_HPS_SOURCE_PORT_A;
1233  vv->current_hps_sync = SAA7146_HPS_SYNC_PORT_A;
1234 }
1235 
1236 
1237 static int video_open(struct saa7146_dev *dev, struct file *file)
1238 {
1239  struct saa7146_fh *fh = file->private_data;
1240 
1241  videobuf_queue_sg_init(&fh->video_q, &video_qops,
1242  &dev->pci->dev, &dev->slock,
1243  V4L2_BUF_TYPE_VIDEO_CAPTURE,
1244  V4L2_FIELD_INTERLACED,
1245  sizeof(struct saa7146_buf),
1246  file, &dev->v4l2_lock);
1247 
1248  return 0;
1249 }
1250 
1251 
1252 static void video_close(struct saa7146_dev *dev, struct file *file)
1253 {
1254  struct saa7146_fh *fh = file->private_data;
1255  struct saa7146_vv *vv = dev->vv_data;
1256  struct videobuf_queue *q = &fh->video_q;
1257 
1258  if (IS_CAPTURE_ACTIVE(fh) != 0)
1259  video_end(fh, file);
1260  else if (IS_OVERLAY_ACTIVE(fh) != 0)
1261  saa7146_stop_preview(fh);
1262 
1263  videobuf_stop(q);
1264  /* hmm, why is this function declared void? */
1265 }
1266 
1267 
1268 static void video_irq_done(struct saa7146_dev *dev, unsigned long st)
1269 {
1270  struct saa7146_vv *vv = dev->vv_data;
1271  struct saa7146_dmaqueue *q = &vv->video_dmaq;
1272 
1273  spin_lock(&dev->slock);
1274  DEB_CAP("called\n");
1275 
1276  /* only finish the buffer if we have one... */
1277  if( NULL != q->curr ) {
1278  saa7146_buffer_finish(dev,q,VIDEOBUF_DONE);
1279  }
1280  saa7146_buffer_next(dev,q,0);
1281 
1282  spin_unlock(&dev->slock);
1283 }
1284 
1285 static ssize_t video_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
1286 {
1287  struct saa7146_fh *fh = file->private_data;
1288  struct saa7146_dev *dev = fh->dev;
1289  struct saa7146_vv *vv = dev->vv_data;
1290  ssize_t ret = 0;
1291 
1292  DEB_EE("called\n");
1293 
1294  if ((vv->video_status & STATUS_CAPTURE) != 0) {
1295  /* fixme: should we allow read() captures while streaming capture? */
1296  if (vv->video_fh == fh) {
1297  DEB_S("already capturing\n");
1298  return -EBUSY;
1299  }
1300  DEB_S("already capturing in another open\n");
1301  return -EBUSY;
1302  }
1303 
1304  ret = video_begin(fh);
1305  if( 0 != ret) {
1306  goto out;
1307  }
1308 
1309  ret = videobuf_read_one(&fh->video_q , data, count, ppos,
1310  file->f_flags & O_NONBLOCK);
1311  if (ret != 0) {
1312  video_end(fh, file);
1313  } else {
1314  ret = video_end(fh, file);
1315  }
1316 out:
1317  /* restart overlay if it was active before */
1318  if (vv->ov_suspend != NULL) {
1319  saa7146_start_preview(vv->ov_suspend);
1320  vv->ov_suspend = NULL;
1321  }
1322 
1323  return ret;
1324 }
1325 
1326 struct saa7146_use_ops saa7146_video_uops = {
1327  .init = video_init,
1328  .open = video_open,
1329  .release = video_close,
1330  .irq_done = video_irq_done,
1331  .read = video_read,
1332 };
Generated on Thu Jan 10 2013 13:44:35 for Linux Kernel by   doxygen 1.8.2