1d961023b837c973852225cc0ba621205d4651ed
[linux-2.6.git] / drivers / media / common / saa7146_video.c
1 #include <media/saa7146_vv.h>
2
3 static int max_memory = 32;
4
5 module_param(max_memory, int, 0644);
6 MODULE_PARM_DESC(max_memory, "maximum memory usage for capture buffers (default: 32Mb)");
7
8 #define IS_CAPTURE_ACTIVE(fh) \
9         (((vv->video_status & STATUS_CAPTURE) != 0) && (vv->video_fh == fh))
10
11 #define IS_OVERLAY_ACTIVE(fh) \
12         (((vv->video_status & STATUS_OVERLAY) != 0) && (vv->video_fh == fh))
13
14 /* format descriptions for capture and preview */
15 static struct saa7146_format formats[] = {
16         {
17                 .name           = "RGB-8 (3-3-2)",
18                 .pixelformat    = V4L2_PIX_FMT_RGB332,
19                 .trans          = RGB08_COMPOSED,
20                 .depth          = 8,
21                 .flags          = 0,
22         }, {
23                 .name           = "RGB-16 (5/B-6/G-5/R)",
24                 .pixelformat    = V4L2_PIX_FMT_RGB565,
25                 .trans          = RGB16_COMPOSED,
26                 .depth          = 16,
27                 .flags          = 0,
28         }, {
29                 .name           = "RGB-24 (B-G-R)",
30                 .pixelformat    = V4L2_PIX_FMT_BGR24,
31                 .trans          = RGB24_COMPOSED,
32                 .depth          = 24,
33                 .flags          = 0,
34         }, {
35                 .name           = "RGB-32 (B-G-R)",
36                 .pixelformat    = V4L2_PIX_FMT_BGR32,
37                 .trans          = RGB32_COMPOSED,
38                 .depth          = 32,
39                 .flags          = 0,
40         }, {
41                 .name           = "RGB-32 (R-G-B)",
42                 .pixelformat    = V4L2_PIX_FMT_RGB32,
43                 .trans          = RGB32_COMPOSED,
44                 .depth          = 32,
45                 .flags          = 0,
46                 .swap           = 0x2,
47         }, {
48                 .name           = "Greyscale-8",
49                 .pixelformat    = V4L2_PIX_FMT_GREY,
50                 .trans          = Y8,
51                 .depth          = 8,
52                 .flags          = 0,
53         }, {
54                 .name           = "YUV 4:2:2 planar (Y-Cb-Cr)",
55                 .pixelformat    = V4L2_PIX_FMT_YUV422P,
56                 .trans          = YUV422_DECOMPOSED,
57                 .depth          = 16,
58                 .flags          = FORMAT_BYTE_SWAP|FORMAT_IS_PLANAR,
59         }, {
60                 .name           = "YVU 4:2:0 planar (Y-Cb-Cr)",
61                 .pixelformat    = V4L2_PIX_FMT_YVU420,
62                 .trans          = YUV420_DECOMPOSED,
63                 .depth          = 12,
64                 .flags          = FORMAT_BYTE_SWAP|FORMAT_IS_PLANAR,
65         }, {
66                 .name           = "YUV 4:2:0 planar (Y-Cb-Cr)",
67                 .pixelformat    = V4L2_PIX_FMT_YUV420,
68                 .trans          = YUV420_DECOMPOSED,
69                 .depth          = 12,
70                 .flags          = FORMAT_IS_PLANAR,
71         }, {
72                 .name           = "YUV 4:2:2 (U-Y-V-Y)",
73                 .pixelformat    = V4L2_PIX_FMT_UYVY,
74                 .trans          = YUV422_COMPOSED,
75                 .depth          = 16,
76                 .flags          = 0,
77         }
78 };
79
80 /* unfortunately, the saa7146 contains a bug which prevents it from doing on-the-fly byte swaps.
81    due to this, it's impossible to provide additional *packed* formats, which are simply byte swapped
82    (like V4L2_PIX_FMT_YUYV) ... 8-( */
83
84 static int NUM_FORMATS = sizeof(formats)/sizeof(struct saa7146_format);
85
86 struct saa7146_format* format_by_fourcc(struct saa7146_dev *dev, int fourcc)
87 {
88         int i, j = NUM_FORMATS;
89
90         for (i = 0; i < j; i++) {
91                 if (formats[i].pixelformat == fourcc) {
92                         return formats+i;
93                 }
94         }
95
96         DEB_D(("unknown pixelformat:'%4.4s'\n",(char *)&fourcc));
97         return NULL;
98 }
99
100 static int g_fmt(struct saa7146_fh *fh, struct v4l2_format *f)
101 {
102         struct saa7146_dev *dev = fh->dev;
103         DEB_EE(("dev:%p, fh:%p\n",dev,fh));
104
105         switch (f->type) {
106         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
107                 f->fmt.pix = fh->video_fmt;
108                 return 0;
109         case V4L2_BUF_TYPE_VIDEO_OVERLAY:
110                 f->fmt.win = fh->ov.win;
111                 return 0;
112         case V4L2_BUF_TYPE_VBI_CAPTURE:
113         {
114                 f->fmt.vbi = fh->vbi_fmt;
115                 return 0;
116         }
117         default:
118                 DEB_D(("invalid format type '%d'.\n",f->type));
119                 return -EINVAL;
120         }
121 }
122
123 static int try_win(struct saa7146_dev *dev, struct v4l2_window *win)
124 {
125         struct saa7146_vv *vv = dev->vv_data;
126         enum v4l2_field field;
127         int maxw, maxh;
128
129         DEB_EE(("dev:%p\n",dev));
130
131         if (NULL == vv->ov_fb.base) {
132                 DEB_D(("no fb base set.\n"));
133                 return -EINVAL;
134         }
135         if (NULL == vv->ov_fmt) {
136                 DEB_D(("no fb fmt set.\n"));
137                 return -EINVAL;
138         }
139         if (win->w.width < 48 || win->w.height <  32) {
140                 DEB_D(("min width/height. (%d,%d)\n",win->w.width,win->w.height));
141                 return -EINVAL;
142         }
143         if (win->clipcount > 16) {
144                 DEB_D(("clipcount too big.\n"));
145                 return -EINVAL;
146         }
147
148         field = win->field;
149         maxw  = vv->standard->h_max_out;
150         maxh  = vv->standard->v_max_out;
151
152         if (V4L2_FIELD_ANY == field) {
153                 field = (win->w.height > maxh/2)
154                         ? V4L2_FIELD_INTERLACED
155                         : V4L2_FIELD_TOP;
156                 }
157         switch (field) {
158         case V4L2_FIELD_TOP:
159         case V4L2_FIELD_BOTTOM:
160         case V4L2_FIELD_ALTERNATE:
161                 maxh = maxh / 2;
162                 break;
163         case V4L2_FIELD_INTERLACED:
164                 break;
165         default: {
166                 DEB_D(("no known field mode '%d'.\n",field));
167                 return -EINVAL;
168         }
169         }
170
171         win->field = field;
172         if (win->w.width > maxw)
173                 win->w.width = maxw;
174         if (win->w.height > maxh)
175                 win->w.height = maxh;
176
177         return 0;
178 }
179
180 static int try_fmt(struct saa7146_fh *fh, struct v4l2_format *f)
181 {
182         struct saa7146_dev *dev = fh->dev;
183         struct saa7146_vv *vv = dev->vv_data;
184         int err;
185
186         switch (f->type) {
187         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
188         {
189                 struct saa7146_format *fmt;
190                 enum v4l2_field field;
191                 int maxw, maxh;
192                 int calc_bpl;
193
194                 DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: dev:%p, fh:%p\n",dev,fh));
195
196                 fmt = format_by_fourcc(dev,f->fmt.pix.pixelformat);
197                 if (NULL == fmt) {
198                         return -EINVAL;
199                 }
200
201                 field = f->fmt.pix.field;
202                 maxw  = vv->standard->h_max_out;
203                 maxh  = vv->standard->v_max_out;
204
205                 if (V4L2_FIELD_ANY == field) {
206                         field = (f->fmt.pix.height > maxh/2)
207                                 ? V4L2_FIELD_INTERLACED
208                                 : V4L2_FIELD_BOTTOM;
209                 }
210                 switch (field) {
211                 case V4L2_FIELD_ALTERNATE: {
212                         vv->last_field = V4L2_FIELD_TOP;
213                         maxh = maxh / 2;
214                         break;
215                 }
216                 case V4L2_FIELD_TOP:
217                 case V4L2_FIELD_BOTTOM:
218                         vv->last_field = V4L2_FIELD_INTERLACED;
219                         maxh = maxh / 2;
220                         break;
221                 case V4L2_FIELD_INTERLACED:
222                         vv->last_field = V4L2_FIELD_INTERLACED;
223                         break;
224                 default: {
225                         DEB_D(("no known field mode '%d'.\n",field));
226                         return -EINVAL;
227                 }
228                 }
229
230                 f->fmt.pix.field = field;
231                 if (f->fmt.pix.width > maxw)
232                         f->fmt.pix.width = maxw;
233                 if (f->fmt.pix.height > maxh)
234                         f->fmt.pix.height = maxh;
235
236                 calc_bpl = (f->fmt.pix.width * fmt->depth)/8;
237
238                 if (f->fmt.pix.bytesperline < calc_bpl)
239                         f->fmt.pix.bytesperline = calc_bpl;
240
241                 if (f->fmt.pix.bytesperline > (2*PAGE_SIZE * fmt->depth)/8) /* arbitrary constraint */
242                         f->fmt.pix.bytesperline = calc_bpl;
243
244                 f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * f->fmt.pix.height;
245                 DEB_D(("w:%d, h:%d, bytesperline:%d, sizeimage:%d\n",f->fmt.pix.width,f->fmt.pix.height,f->fmt.pix.bytesperline,f->fmt.pix.sizeimage));
246
247                 return 0;
248         }
249         case V4L2_BUF_TYPE_VIDEO_OVERLAY:
250                 DEB_EE(("V4L2_BUF_TYPE_VIDEO_OVERLAY: dev:%p, fh:%p\n",dev,fh));
251                 err = try_win(dev,&f->fmt.win);
252                 if (0 != err) {
253                         return err;
254                 }
255                 return 0;
256         default:
257                 DEB_EE(("unknown format type '%d'\n",f->type));
258                 return -EINVAL;
259         }
260 }
261
262 int saa7146_start_preview(struct saa7146_fh *fh)
263 {
264         struct saa7146_dev *dev = fh->dev;
265         struct saa7146_vv *vv = dev->vv_data;
266         int ret = 0, err = 0;
267
268         DEB_EE(("dev:%p, fh:%p\n",dev,fh));
269
270         /* check if we have overlay informations */
271         if( NULL == fh->ov.fh ) {
272                 DEB_D(("no overlay data available. try S_FMT first.\n"));
273                 return -EAGAIN;
274         }
275
276         /* check if streaming capture is running */
277         if (IS_CAPTURE_ACTIVE(fh) != 0) {
278                 DEB_D(("streaming capture is active.\n"));
279                 return -EBUSY;
280         }
281
282         /* check if overlay is running */
283         if (IS_OVERLAY_ACTIVE(fh) != 0) {
284                 if (vv->video_fh == fh) {
285                         DEB_D(("overlay is already active.\n"));
286                         return 0;
287                 }
288                 DEB_D(("overlay is already active in another open.\n"));
289                 return -EBUSY;
290         }
291
292         if (0 == saa7146_res_get(fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP)) {
293                 DEB_D(("cannot get necessary overlay resources\n"));
294                 return -EBUSY;
295         }
296
297         err = try_win(dev,&fh->ov.win);
298         if (0 != err) {
299                 saa7146_res_free(vv->video_fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
300                 return -EBUSY;
301         }
302
303         vv->ov_data = &fh->ov;
304
305         DEB_D(("%dx%d+%d+%d %s field=%s\n",
306                 fh->ov.win.w.width,fh->ov.win.w.height,
307                 fh->ov.win.w.left,fh->ov.win.w.top,
308                 vv->ov_fmt->name,v4l2_field_names[fh->ov.win.field]));
309
310         if (0 != (ret = saa7146_enable_overlay(fh))) {
311                 DEB_D(("enabling overlay failed: %d\n",ret));
312                 saa7146_res_free(vv->video_fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
313                 return ret;
314         }
315
316         vv->video_status = STATUS_OVERLAY;
317         vv->video_fh = fh;
318
319         return 0;
320 }
321
322 int saa7146_stop_preview(struct saa7146_fh *fh)
323 {
324         struct saa7146_dev *dev = fh->dev;
325         struct saa7146_vv *vv = dev->vv_data;
326
327         DEB_EE(("dev:%p, fh:%p\n",dev,fh));
328
329         /* check if streaming capture is running */
330         if (IS_CAPTURE_ACTIVE(fh) != 0) {
331                 DEB_D(("streaming capture is active.\n"));
332                 return -EBUSY;
333         }
334
335         /* check if overlay is running at all */
336         if ((vv->video_status & STATUS_OVERLAY) == 0) {
337                 DEB_D(("no active overlay.\n"));
338                 return 0;
339         }
340
341         if (vv->video_fh != fh) {
342                 DEB_D(("overlay is active, but in another open.\n"));
343                 return -EBUSY;
344         }
345
346         vv->video_status = 0;
347         vv->video_fh = NULL;
348
349         saa7146_disable_overlay(fh);
350
351         saa7146_res_free(fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
352
353         return 0;
354 }
355
356 static int s_fmt(struct saa7146_fh *fh, struct v4l2_format *f)
357 {
358         struct saa7146_dev *dev = fh->dev;
359         struct saa7146_vv *vv = dev->vv_data;
360
361         int err;
362
363         switch (f->type) {
364         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
365                 DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: dev:%p, fh:%p\n",dev,fh));
366                 if (IS_CAPTURE_ACTIVE(fh) != 0) {
367                         DEB_EE(("streaming capture is active\n"));
368                         return -EBUSY;
369                 }
370                 err = try_fmt(fh,f);
371                 if (0 != err)
372                         return err;
373                 fh->video_fmt = f->fmt.pix;
374                 DEB_EE(("set to pixelformat '%4.4s'\n",(char *)&fh->video_fmt.pixelformat));
375                 return 0;
376         case V4L2_BUF_TYPE_VIDEO_OVERLAY:
377                 DEB_EE(("V4L2_BUF_TYPE_VIDEO_OVERLAY: dev:%p, fh:%p\n",dev,fh));
378                 err = try_win(dev,&f->fmt.win);
379                 if (0 != err)
380                         return err;
381                 down(&dev->lock);
382                 fh->ov.win    = f->fmt.win;
383                 fh->ov.nclips = f->fmt.win.clipcount;
384                 if (fh->ov.nclips > 16)
385                         fh->ov.nclips = 16;
386                 if (copy_from_user(fh->ov.clips,f->fmt.win.clips,sizeof(struct v4l2_clip)*fh->ov.nclips)) {
387                         up(&dev->lock);
388                         return -EFAULT;
389                 }
390
391                 /* fh->ov.fh is used to indicate that we have valid overlay informations, too */
392                 fh->ov.fh = fh;
393
394                 up(&dev->lock);
395
396                 /* check if our current overlay is active */
397                 if (IS_OVERLAY_ACTIVE(fh) != 0) {
398                         saa7146_stop_preview(fh);
399                         saa7146_start_preview(fh);
400                 }
401                 return 0;
402         default:
403                 DEB_D(("unknown format type '%d'\n",f->type));
404                 return -EINVAL;
405         }
406 }
407
408 /********************************************************************************/
409 /* device controls */
410
411 static struct v4l2_queryctrl controls[] = {
412         {
413                 .id             = V4L2_CID_BRIGHTNESS,
414                 .name           = "Brightness",
415                 .minimum        = 0,
416                 .maximum        = 255,
417                 .step           = 1,
418                 .default_value  = 128,
419                 .type           = V4L2_CTRL_TYPE_INTEGER,
420         },{
421                 .id             = V4L2_CID_CONTRAST,
422                 .name           = "Contrast",
423                 .minimum        = 0,
424                 .maximum        = 127,
425                 .step           = 1,
426                 .default_value  = 64,
427                 .type           = V4L2_CTRL_TYPE_INTEGER,
428         },{
429                 .id             = V4L2_CID_SATURATION,
430                 .name           = "Saturation",
431                 .minimum        = 0,
432                 .maximum        = 127,
433                 .step           = 1,
434                 .default_value  = 64,
435                 .type           = V4L2_CTRL_TYPE_INTEGER,
436         },{
437                 .id             = V4L2_CID_VFLIP,
438                 .name           = "Vertical flip",
439                 .minimum        = 0,
440                 .maximum        = 1,
441                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
442         },{
443                 .id             = V4L2_CID_HFLIP,
444                 .name           = "Horizontal flip",
445                 .minimum        = 0,
446                 .maximum        = 1,
447                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
448         },
449 };
450 static int NUM_CONTROLS = sizeof(controls)/sizeof(struct v4l2_queryctrl);
451
452 #define V4L2_CID_PRIVATE_LASTP1      (V4L2_CID_PRIVATE_BASE + 0)
453
454 static struct v4l2_queryctrl* ctrl_by_id(int id)
455 {
456         int i;
457
458         for (i = 0; i < NUM_CONTROLS; i++)
459                 if (controls[i].id == id)
460                         return controls+i;
461         return NULL;
462 }
463
464 static int get_control(struct saa7146_fh *fh, struct v4l2_control *c)
465 {
466         struct saa7146_dev *dev = fh->dev;
467         struct saa7146_vv *vv = dev->vv_data;
468
469         const struct v4l2_queryctrl* ctrl;
470         u32 value = 0;
471
472         ctrl = ctrl_by_id(c->id);
473         if (NULL == ctrl)
474                 return -EINVAL;
475         switch (c->id) {
476         case V4L2_CID_BRIGHTNESS:
477                 value = saa7146_read(dev, BCS_CTRL);
478                 c->value = 0xff & (value >> 24);
479                 DEB_D(("V4L2_CID_BRIGHTNESS: %d\n",c->value));
480                 break;
481         case V4L2_CID_CONTRAST:
482                 value = saa7146_read(dev, BCS_CTRL);
483                 c->value = 0x7f & (value >> 16);
484                 DEB_D(("V4L2_CID_CONTRAST: %d\n",c->value));
485                 break;
486         case V4L2_CID_SATURATION:
487                 value = saa7146_read(dev, BCS_CTRL);
488                 c->value = 0x7f & (value >> 0);
489                 DEB_D(("V4L2_CID_SATURATION: %d\n",c->value));
490                 break;
491         case V4L2_CID_VFLIP:
492                 c->value = vv->vflip;
493                 DEB_D(("V4L2_CID_VFLIP: %d\n",c->value));
494                 break;
495         case V4L2_CID_HFLIP:
496                 c->value = vv->hflip;
497                 DEB_D(("V4L2_CID_HFLIP: %d\n",c->value));
498                 break;
499         default:
500                 return -EINVAL;
501         }
502
503         return 0;
504 }
505
506 static int set_control(struct saa7146_fh *fh, struct v4l2_control *c)
507 {
508         struct saa7146_dev *dev = fh->dev;
509         struct saa7146_vv *vv = dev->vv_data;
510
511         const struct v4l2_queryctrl* ctrl;
512
513         ctrl = ctrl_by_id(c->id);
514         if (NULL == ctrl) {
515                 DEB_D(("unknown control %d\n",c->id));
516                 return -EINVAL;
517         }
518
519         down(&dev->lock);
520
521         switch (ctrl->type) {
522         case V4L2_CTRL_TYPE_BOOLEAN:
523         case V4L2_CTRL_TYPE_MENU:
524         case V4L2_CTRL_TYPE_INTEGER:
525                 if (c->value < ctrl->minimum)
526                         c->value = ctrl->minimum;
527                 if (c->value > ctrl->maximum)
528                         c->value = ctrl->maximum;
529                 break;
530         default:
531                 /* nothing */;
532         };
533
534         switch (c->id) {
535         case V4L2_CID_BRIGHTNESS: {
536                 u32 value = saa7146_read(dev, BCS_CTRL);
537                 value &= 0x00ffffff;
538                 value |= (c->value << 24);
539                 saa7146_write(dev, BCS_CTRL, value);
540                 saa7146_write(dev, MC2, MASK_22 | MASK_06 );
541                 break;
542         }
543         case V4L2_CID_CONTRAST: {
544                 u32 value = saa7146_read(dev, BCS_CTRL);
545                 value &= 0xff00ffff;
546                 value |= (c->value << 16);
547                 saa7146_write(dev, BCS_CTRL, value);
548                 saa7146_write(dev, MC2, MASK_22 | MASK_06 );
549                 break;
550         }
551         case V4L2_CID_SATURATION: {
552                 u32 value = saa7146_read(dev, BCS_CTRL);
553                 value &= 0xffffff00;
554                 value |= (c->value << 0);
555                 saa7146_write(dev, BCS_CTRL, value);
556                 saa7146_write(dev, MC2, MASK_22 | MASK_06 );
557                 break;
558         }
559         case V4L2_CID_HFLIP:
560                 /* fixme: we can support changing VFLIP and HFLIP here... */
561                 if (IS_CAPTURE_ACTIVE(fh) != 0) {
562                         DEB_D(("V4L2_CID_HFLIP while active capture.\n"));
563                         up(&dev->lock);
564                         return -EINVAL;
565                 }
566                 vv->hflip = c->value;
567                 break;
568         case V4L2_CID_VFLIP:
569                 if (IS_CAPTURE_ACTIVE(fh) != 0) {
570                         DEB_D(("V4L2_CID_VFLIP while active capture.\n"));
571                         up(&dev->lock);
572                         return -EINVAL;
573                 }
574                 vv->vflip = c->value;
575                 break;
576         default: {
577                 return -EINVAL;
578         }
579         }
580         up(&dev->lock);
581
582         if (IS_OVERLAY_ACTIVE(fh) != 0) {
583                 saa7146_stop_preview(fh);
584                 saa7146_start_preview(fh);
585         }
586         return 0;
587 }
588
589 /********************************************************************************/
590 /* common pagetable functions */
591
592 static int saa7146_pgtable_build(struct saa7146_dev *dev, struct saa7146_buf *buf)
593 {
594         struct pci_dev *pci = dev->pci;
595         struct scatterlist *list = buf->vb.dma.sglist;
596         int length = buf->vb.dma.sglen;
597         struct saa7146_format *sfmt = format_by_fourcc(dev,buf->fmt->pixelformat);
598
599         DEB_EE(("dev:%p, buf:%p, sg_len:%d\n",dev,buf,length));
600
601         if( 0 != IS_PLANAR(sfmt->trans)) {
602                 struct saa7146_pgtable *pt1 = &buf->pt[0];
603                 struct saa7146_pgtable *pt2 = &buf->pt[1];
604                 struct saa7146_pgtable *pt3 = &buf->pt[2];
605                 u32  *ptr1, *ptr2, *ptr3;
606                 u32 fill;
607
608                 int size = buf->fmt->width*buf->fmt->height;
609                 int i,p,m1,m2,m3,o1,o2;
610
611                 switch( sfmt->depth ) {
612                         case 12: {
613                                 /* create some offsets inside the page table */
614                                 m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
615                                 m2 = ((size+(size/4)+PAGE_SIZE)/PAGE_SIZE)-1;
616                                 m3 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
617                                 o1 = size%PAGE_SIZE;
618                                 o2 = (size+(size/4))%PAGE_SIZE;
619                                 DEB_CAP(("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",size,m1,m2,m3,o1,o2));
620                                 break;
621                         }
622                         case 16: {
623                                 /* create some offsets inside the page table */
624                                 m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
625                                 m2 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
626                                 m3 = ((2*size+PAGE_SIZE)/PAGE_SIZE)-1;
627                                 o1 = size%PAGE_SIZE;
628                                 o2 = (size+(size/2))%PAGE_SIZE;
629                                 DEB_CAP(("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",size,m1,m2,m3,o1,o2));
630                                 break;
631                         }
632                         default: {
633                                 return -1;
634                         }
635                 }
636
637                 ptr1 = pt1->cpu;
638                 ptr2 = pt2->cpu;
639                 ptr3 = pt3->cpu;
640
641                 /* walk all pages, copy all page addresses to ptr1 */
642                 for (i = 0; i < length; i++, list++) {
643                         for (p = 0; p * 4096 < list->length; p++, ptr1++) {
644                                 *ptr1 = cpu_to_le32(sg_dma_address(list) - list->offset);
645                         }
646                 }
647 /*
648                 ptr1 = pt1->cpu;
649                 for(j=0;j<40;j++) {
650                         printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
651                 }
652 */
653
654                 /* if we have a user buffer, the first page may not be
655                    aligned to a page boundary. */
656                 pt1->offset = buf->vb.dma.sglist->offset;
657                 pt2->offset = pt1->offset+o1;
658                 pt3->offset = pt1->offset+o2;
659
660                 /* create video-dma2 page table */
661                 ptr1 = pt1->cpu;
662                 for(i = m1; i <= m2 ; i++, ptr2++) {
663                         *ptr2 = ptr1[i];
664                 }
665                 fill = *(ptr2-1);
666                 for(;i<1024;i++,ptr2++) {
667                         *ptr2 = fill;
668                 }
669                 /* create video-dma3 page table */
670                 ptr1 = pt1->cpu;
671                 for(i = m2; i <= m3; i++,ptr3++) {
672                         *ptr3 = ptr1[i];
673                 }
674                 fill = *(ptr3-1);
675                 for(;i<1024;i++,ptr3++) {
676                         *ptr3 = fill;
677                 }
678                 /* finally: finish up video-dma1 page table */
679                 ptr1 = pt1->cpu+m1;
680                 fill = pt1->cpu[m1];
681                 for(i=m1;i<1024;i++,ptr1++) {
682                         *ptr1 = fill;
683                 }
684 /*
685                 ptr1 = pt1->cpu;
686                 ptr2 = pt2->cpu;
687                 ptr3 = pt3->cpu;
688                 for(j=0;j<40;j++) {
689                         printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
690                 }
691                 for(j=0;j<40;j++) {
692                         printk("ptr2 %d: 0x%08x\n",j,ptr2[j]);
693                 }
694                 for(j=0;j<40;j++) {
695                         printk("ptr3 %d: 0x%08x\n",j,ptr3[j]);
696                 }
697 */
698         } else {
699                 struct saa7146_pgtable *pt = &buf->pt[0];
700                 return saa7146_pgtable_build_single(pci, pt, list, length);
701         }
702
703         return 0;
704 }
705
706
707 /********************************************************************************/
708 /* file operations */
709
710 static int video_begin(struct saa7146_fh *fh)
711 {
712         struct saa7146_dev *dev = fh->dev;
713         struct saa7146_vv *vv = dev->vv_data;
714         struct saa7146_format *fmt = NULL;
715         unsigned int resource;
716         int ret = 0, err = 0;
717
718         DEB_EE(("dev:%p, fh:%p\n",dev,fh));
719
720         if ((vv->video_status & STATUS_CAPTURE) != 0) {
721                 if (vv->video_fh == fh) {
722                         DEB_S(("already capturing.\n"));
723                         return 0;
724                 }
725                 DEB_S(("already capturing in another open.\n"));
726                 return -EBUSY;
727         }
728
729         if ((vv->video_status & STATUS_OVERLAY) != 0) {
730                 DEB_S(("warning: suspending overlay video for streaming capture.\n"));
731                 vv->ov_suspend = vv->video_fh;
732                 err = saa7146_stop_preview(vv->video_fh); /* side effect: video_status is now 0, video_fh is NULL */
733                 if (0 != err) {
734                         DEB_D(("suspending video failed. aborting\n"));
735                         return err;
736                 }
737         }
738
739         fmt = format_by_fourcc(dev,fh->video_fmt.pixelformat);
740         /* we need to have a valid format set here */
741         BUG_ON(NULL == fmt);
742
743         if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
744                 resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
745         } else {
746                 resource = RESOURCE_DMA1_HPS;
747         }
748
749         ret = saa7146_res_get(fh, resource);
750         if (0 == ret) {
751                 DEB_S(("cannot get capture resource %d\n",resource));
752                 if (vv->ov_suspend != NULL) {
753                         saa7146_start_preview(vv->ov_suspend);
754                         vv->ov_suspend = NULL;
755                 }
756                 return -EBUSY;
757         }
758
759         /* clear out beginning of streaming bit (rps register 0)*/
760         saa7146_write(dev, MC2, MASK_27 );
761
762         /* enable rps0 irqs */
763         SAA7146_IER_ENABLE(dev, MASK_27);
764
765         vv->video_fh = fh;
766         vv->video_status = STATUS_CAPTURE;
767
768         return 0;
769 }
770
771 static int video_end(struct saa7146_fh *fh, struct file *file)
772 {
773         struct saa7146_dev *dev = fh->dev;
774         struct saa7146_vv *vv = dev->vv_data;
775         struct saa7146_format *fmt = NULL;
776         unsigned long flags;
777         unsigned int resource;
778         u32 dmas = 0;
779         DEB_EE(("dev:%p, fh:%p\n",dev,fh));
780
781         if ((vv->video_status & STATUS_CAPTURE) != STATUS_CAPTURE) {
782                 DEB_S(("not capturing.\n"));
783                 return 0;
784         }
785
786         if (vv->video_fh != fh) {
787                 DEB_S(("capturing, but in another open.\n"));
788                 return -EBUSY;
789         }
790
791         fmt = format_by_fourcc(dev,fh->video_fmt.pixelformat);
792         /* we need to have a valid format set here */
793         BUG_ON(NULL == fmt);
794
795         if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
796                 resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
797                 dmas = MASK_22 | MASK_21 | MASK_20;
798         } else {
799                 resource = RESOURCE_DMA1_HPS;
800                 dmas = MASK_22;
801         }
802         spin_lock_irqsave(&dev->slock,flags);
803
804         /* disable rps0  */
805         saa7146_write(dev, MC1, MASK_28);
806
807         /* disable rps0 irqs */
808         SAA7146_IER_DISABLE(dev, MASK_27);
809
810         /* shut down all used video dma transfers */
811         saa7146_write(dev, MC1, dmas);
812
813         spin_unlock_irqrestore(&dev->slock, flags);
814
815         vv->video_fh = NULL;
816         vv->video_status = 0;
817
818         saa7146_res_free(fh, resource);
819
820         if (vv->ov_suspend != NULL) {
821                 saa7146_start_preview(vv->ov_suspend);
822                 vv->ov_suspend = NULL;
823         }
824
825         return 0;
826 }
827
828 /*
829  * This function is _not_ called directly, but from
830  * video_generic_ioctl (and maybe others).  userspace
831  * copying is done already, arg is a kernel pointer.
832  */
833
834 int saa7146_video_do_ioctl(struct inode *inode, struct file *file, unsigned int cmd, void *arg)
835 {
836         struct saa7146_fh *fh  = file->private_data;
837         struct saa7146_dev *dev = fh->dev;
838         struct saa7146_vv *vv = dev->vv_data;
839
840         int err = 0, result = 0, ee = 0;
841
842         struct saa7146_use_ops *ops;
843         struct videobuf_queue *q;
844
845         /* check if extension handles the command */
846         for(ee = 0; dev->ext_vv_data->ioctls[ee].flags != 0; ee++) {
847                 if( cmd == dev->ext_vv_data->ioctls[ee].cmd )
848                         break;
849         }
850
851         if( 0 != (dev->ext_vv_data->ioctls[ee].flags & SAA7146_EXCLUSIVE) ) {
852                 DEB_D(("extension handles ioctl exclusive.\n"));
853                 result = dev->ext_vv_data->ioctl(fh, cmd, arg);
854                 return result;
855         }
856         if( 0 != (dev->ext_vv_data->ioctls[ee].flags & SAA7146_BEFORE) ) {
857                 DEB_D(("extension handles ioctl before.\n"));
858                 result = dev->ext_vv_data->ioctl(fh, cmd, arg);
859                 if( -EAGAIN != result ) {
860                         return result;
861                 }
862         }
863
864         /* fixme: add handle "after" case (is it still needed?) */
865
866         switch (fh->type) {
867         case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
868                 ops = &saa7146_video_uops;
869                 q = &fh->video_q;
870                 break;
871                 }
872         case V4L2_BUF_TYPE_VBI_CAPTURE: {
873                 ops = &saa7146_vbi_uops;
874                 q = &fh->vbi_q;
875                 break;
876                 }
877         default:
878                 BUG();
879                 return 0;
880         }
881
882         switch (cmd) {
883         case VIDIOC_QUERYCAP:
884         {
885                 struct v4l2_capability *cap = arg;
886                 memset(cap,0,sizeof(*cap));
887
888                 DEB_EE(("VIDIOC_QUERYCAP\n"));
889
890                 strcpy(cap->driver, "saa7146 v4l2");
891                 strlcpy(cap->card, dev->ext->name, sizeof(cap->card));
892                 sprintf(cap->bus_info,"PCI:%s", pci_name(dev->pci));
893                 cap->version = SAA7146_VERSION_CODE;
894                 cap->capabilities =
895                         V4L2_CAP_VIDEO_CAPTURE |
896                         V4L2_CAP_VIDEO_OVERLAY |
897                         V4L2_CAP_READWRITE |
898                         V4L2_CAP_STREAMING;
899                 cap->capabilities |= dev->ext_vv_data->capabilities;
900                 return 0;
901         }
902         case VIDIOC_G_FBUF:
903         {
904                 struct v4l2_framebuffer *fb = arg;
905
906                 DEB_EE(("VIDIOC_G_FBUF\n"));
907
908                 *fb = vv->ov_fb;
909                 fb->capability = V4L2_FBUF_CAP_LIST_CLIPPING;
910                 return 0;
911         }
912         case VIDIOC_S_FBUF:
913         {
914                 struct v4l2_framebuffer *fb = arg;
915                 struct saa7146_format *fmt;
916
917                 DEB_EE(("VIDIOC_S_FBUF\n"));
918
919                 if(!capable(CAP_SYS_ADMIN) &&
920                    !capable(CAP_SYS_RAWIO))
921                         return -EPERM;
922
923                 /* check args */
924                 fmt = format_by_fourcc(dev,fb->fmt.pixelformat);
925                 if (NULL == fmt) {
926                         return -EINVAL;
927                 }
928
929                 /* planar formats are not allowed for overlay video, clipping and video dma would clash */
930                 if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
931                         DEB_S(("planar pixelformat '%4.4s' not allowed for overlay\n",(char *)&fmt->pixelformat));
932                 }
933
934                 /* check if overlay is running */
935                 if (IS_OVERLAY_ACTIVE(fh) != 0) {
936                         if (vv->video_fh != fh) {
937                                 DEB_D(("refusing to change framebuffer informations while overlay is active in another open.\n"));
938                                 return -EBUSY;
939                         }
940                 }
941
942                 down(&dev->lock);
943
944                 /* ok, accept it */
945                 vv->ov_fb = *fb;
946                 vv->ov_fmt = fmt;
947                 if (0 == vv->ov_fb.fmt.bytesperline)
948                         vv->ov_fb.fmt.bytesperline =
949                                 vv->ov_fb.fmt.width*fmt->depth/8;
950
951                 up(&dev->lock);
952
953                 return 0;
954         }
955         case VIDIOC_ENUM_FMT:
956         {
957                 struct v4l2_fmtdesc *f = arg;
958                 int index;
959
960                 switch (f->type) {
961                 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
962                 case V4L2_BUF_TYPE_VIDEO_OVERLAY: {
963                         index = f->index;
964                         if (index < 0 || index >= NUM_FORMATS) {
965                                 return -EINVAL;
966                         }
967                         memset(f,0,sizeof(*f));
968                         f->index = index;
969                         strlcpy(f->description,formats[index].name,sizeof(f->description));
970                         f->pixelformat = formats[index].pixelformat;
971                         break;
972                 }
973                 default:
974                         return -EINVAL;
975                 }
976
977                 DEB_EE(("VIDIOC_ENUM_FMT: type:%d, index:%d\n",f->type,f->index));
978                 return 0;
979         }
980         case VIDIOC_QUERYCTRL:
981         {
982                 const struct v4l2_queryctrl *ctrl;
983                 struct v4l2_queryctrl *c = arg;
984
985                 if ((c->id <  V4L2_CID_BASE ||
986                      c->id >= V4L2_CID_LASTP1) &&
987                     (c->id <  V4L2_CID_PRIVATE_BASE ||
988                      c->id >= V4L2_CID_PRIVATE_LASTP1))
989                         return -EINVAL;
990
991                 ctrl = ctrl_by_id(c->id);
992                 if( NULL == ctrl ) {
993                         return -EINVAL;
994 /*
995                         c->flags = V4L2_CTRL_FLAG_DISABLED;
996                         return 0;
997 */
998                 }
999
1000                 DEB_EE(("VIDIOC_QUERYCTRL: id:%d\n",c->id));
1001                 *c = *ctrl;
1002                 return 0;
1003         }
1004         case VIDIOC_G_CTRL: {
1005                 DEB_EE(("VIDIOC_G_CTRL\n"));
1006                 return get_control(fh,arg);
1007         }
1008         case VIDIOC_S_CTRL:
1009         {
1010                 DEB_EE(("VIDIOC_S_CTRL\n"));
1011                 err = set_control(fh,arg);
1012                 return err;
1013         }
1014         case VIDIOC_G_PARM:
1015         {
1016                 struct v4l2_streamparm *parm = arg;
1017                 if( parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ) {
1018                         return -EINVAL;
1019                 }
1020                 memset(&parm->parm.capture,0,sizeof(struct v4l2_captureparm));
1021                 parm->parm.capture.readbuffers = 1;
1022                 // fixme: only for PAL!
1023                 parm->parm.capture.timeperframe.numerator = 1;
1024                 parm->parm.capture.timeperframe.denominator = 25;
1025                 return 0;
1026         }
1027         case VIDIOC_G_FMT:
1028         {
1029                 struct v4l2_format *f = arg;
1030                 DEB_EE(("VIDIOC_G_FMT\n"));
1031                 return g_fmt(fh,f);
1032         }
1033         case VIDIOC_S_FMT:
1034         {
1035                 struct v4l2_format *f = arg;
1036                 DEB_EE(("VIDIOC_S_FMT\n"));
1037                 return s_fmt(fh,f);
1038         }
1039         case VIDIOC_TRY_FMT:
1040         {
1041                 struct v4l2_format *f = arg;
1042                 DEB_EE(("VIDIOC_TRY_FMT\n"));
1043                 return try_fmt(fh,f);
1044         }
1045         case VIDIOC_G_STD:
1046         {
1047                 v4l2_std_id *id = arg;
1048                 DEB_EE(("VIDIOC_G_STD\n"));
1049                 *id = vv->standard->id;
1050                 return 0;
1051         }
1052         /* the saa7146 supfhrts (used in conjunction with the saa7111a for example)
1053            PAL / NTSC / SECAM. if your hardware does not (or does more)
1054            -- override this function in your extension */
1055         case VIDIOC_ENUMSTD:
1056         {
1057                 struct v4l2_standard *e = arg;
1058                 if (e->index < 0 )
1059                         return -EINVAL;
1060                 if( e->index < dev->ext_vv_data->num_stds ) {
1061                         DEB_EE(("VIDIOC_ENUMSTD: index:%d\n",e->index));
1062                         v4l2_video_std_construct(e, dev->ext_vv_data->stds[e->index].id, dev->ext_vv_data->stds[e->index].name);
1063                         return 0;
1064                 }
1065                 return -EINVAL;
1066         }
1067         case VIDIOC_S_STD:
1068         {
1069                 v4l2_std_id *id = arg;
1070                 int found = 0;
1071                 int i, err;
1072
1073                 DEB_EE(("VIDIOC_S_STD\n"));
1074
1075                 if ((vv->video_status & STATUS_CAPTURE) == STATUS_CAPTURE) {
1076                         DEB_D(("cannot change video standard while streaming capture is active\n"));
1077                         return -EBUSY;
1078                 }
1079
1080                 if ((vv->video_status & STATUS_OVERLAY) != 0) {
1081                         vv->ov_suspend = vv->video_fh;
1082                         err = saa7146_stop_preview(vv->video_fh); /* side effect: video_status is now 0, video_fh is NULL */
1083                         if (0 != err) {
1084                                 DEB_D(("suspending video failed. aborting\n"));
1085                                 return err;
1086                         }
1087                 }
1088
1089                 down(&dev->lock);
1090
1091                 for(i = 0; i < dev->ext_vv_data->num_stds; i++)
1092                         if (*id & dev->ext_vv_data->stds[i].id)
1093                                 break;
1094                 if (i != dev->ext_vv_data->num_stds) {
1095                         vv->standard = &dev->ext_vv_data->stds[i];
1096                         if( NULL != dev->ext_vv_data->std_callback )
1097                                 dev->ext_vv_data->std_callback(dev, vv->standard);
1098                         found = 1;
1099                 }
1100
1101                 up(&dev->lock);
1102
1103                 if (vv->ov_suspend != NULL) {
1104                         saa7146_start_preview(vv->ov_suspend);
1105                         vv->ov_suspend = NULL;
1106                 }
1107
1108                 if( 0 == found ) {
1109                         DEB_EE(("VIDIOC_S_STD: standard not found.\n"));
1110                         return -EINVAL;
1111                 }
1112
1113                 DEB_EE(("VIDIOC_S_STD: set to standard to '%s'\n",vv->standard->name));
1114                 return 0;
1115         }
1116         case VIDIOC_OVERLAY:
1117
1118
1119
1120
1121         {
1122                 int on = *(int *)arg;
1123                 int err = 0;
1124
1125                 DEB_D(("VIDIOC_OVERLAY on:%d\n",on));
1126                 if (on != 0) {
1127                         err = saa7146_start_preview(fh);
1128                 } else {
1129                         err = saa7146_stop_preview(fh);
1130                 }
1131                 return err;
1132         }
1133         case VIDIOC_REQBUFS: {
1134                 struct v4l2_requestbuffers *req = arg;
1135                 DEB_D(("VIDIOC_REQBUFS, type:%d\n",req->type));
1136                 return videobuf_reqbufs(q,req);
1137         }
1138         case VIDIOC_QUERYBUF: {
1139                 struct v4l2_buffer *buf = arg;
1140                 DEB_D(("VIDIOC_QUERYBUF, type:%d, offset:%d\n",buf->type,buf->m.offset));
1141                 return videobuf_querybuf(q,buf);
1142         }
1143         case VIDIOC_QBUF: {
1144                 struct v4l2_buffer *buf = arg;
1145                 int ret = 0;
1146                 ret = videobuf_qbuf(q,buf);
1147                 DEB_D(("VIDIOC_QBUF: ret:%d, index:%d\n",ret,buf->index));
1148                 return ret;
1149         }
1150         case VIDIOC_DQBUF: {
1151                 struct v4l2_buffer *buf = arg;
1152                 int ret = 0;
1153                 ret = videobuf_dqbuf(q,buf,file->f_flags & O_NONBLOCK);
1154                 DEB_D(("VIDIOC_DQBUF: ret:%d, index:%d\n",ret,buf->index));
1155                 return ret;
1156         }
1157         case VIDIOC_STREAMON: {
1158                 int *type = arg;
1159                 DEB_D(("VIDIOC_STREAMON, type:%d\n",*type));
1160
1161                 err = video_begin(fh);
1162                 if( 0 != err) {
1163                         return err;
1164                 }
1165                 err = videobuf_streamon(q);
1166                 return err;
1167         }
1168         case VIDIOC_STREAMOFF: {
1169                 int *type = arg;
1170
1171                 DEB_D(("VIDIOC_STREAMOFF, type:%d\n",*type));
1172
1173                 /* ugly: we need to copy some checks from video_end(),
1174                    because videobuf_streamoff() relies on the capture running.
1175                    check and fix this */
1176                 if ((vv->video_status & STATUS_CAPTURE) != STATUS_CAPTURE) {
1177                         DEB_S(("not capturing.\n"));
1178                         return 0;
1179                 }
1180
1181                 if (vv->video_fh != fh) {
1182                         DEB_S(("capturing, but in another open.\n"));
1183                         return -EBUSY;
1184                 }
1185
1186                 err = videobuf_streamoff(q);
1187                 if (0 != err) {
1188                         DEB_D(("warning: videobuf_streamoff() failed.\n"));
1189                         video_end(fh, file);
1190                 } else {
1191                         err = video_end(fh, file);
1192                 }
1193                 return err;
1194         }
1195         case VIDIOCGMBUF:
1196         {
1197                 struct video_mbuf *mbuf = arg;
1198                 struct videobuf_queue *q;
1199                 int i;
1200
1201                 /* fixme: number of capture buffers and sizes for v4l apps */
1202                 int gbuffers = 2;
1203                 int gbufsize = 768*576*4;
1204
1205                 DEB_D(("VIDIOCGMBUF \n"));
1206
1207                 q = &fh->video_q;
1208                 down(&q->lock);
1209                 err = videobuf_mmap_setup(q,gbuffers,gbufsize,
1210                                           V4L2_MEMORY_MMAP);
1211                 if (err < 0) {
1212                         up(&q->lock);
1213                         return err;
1214                 }
1215                 memset(mbuf,0,sizeof(*mbuf));
1216                 mbuf->frames = gbuffers;
1217                 mbuf->size   = gbuffers * gbufsize;
1218                 for (i = 0; i < gbuffers; i++)
1219                         mbuf->offsets[i] = i * gbufsize;
1220                 up(&q->lock);
1221                 return 0;
1222         }
1223         default:
1224                 return v4l_compat_translate_ioctl(inode,file,cmd,arg,
1225                                                   saa7146_video_do_ioctl);
1226         }
1227         return 0;
1228 }
1229
1230 /*********************************************************************************/
1231 /* buffer handling functions                                                  */
1232
1233 static int buffer_activate (struct saa7146_dev *dev,
1234                      struct saa7146_buf *buf,
1235                      struct saa7146_buf *next)
1236 {
1237         struct saa7146_vv *vv = dev->vv_data;
1238
1239         buf->vb.state = STATE_ACTIVE;
1240         saa7146_set_capture(dev,buf,next);
1241
1242         mod_timer(&vv->video_q.timeout, jiffies+BUFFER_TIMEOUT);
1243         return 0;
1244 }
1245
1246 static int buffer_prepare(struct videobuf_queue *q,
1247                           struct videobuf_buffer *vb, enum v4l2_field field)
1248 {
1249         struct file *file = q->priv_data;
1250         struct saa7146_fh *fh = file->private_data;
1251         struct saa7146_dev *dev = fh->dev;
1252         struct saa7146_vv *vv = dev->vv_data;
1253         struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1254         int size,err = 0;
1255
1256         DEB_CAP(("vbuf:%p\n",vb));
1257
1258         /* sanity checks */
1259         if (fh->video_fmt.width  < 48 ||
1260             fh->video_fmt.height < 32 ||
1261             fh->video_fmt.width  > vv->standard->h_max_out ||
1262             fh->video_fmt.height > vv->standard->v_max_out) {
1263                 DEB_D(("w (%d) / h (%d) out of bounds.\n",fh->video_fmt.width,fh->video_fmt.height));
1264                 return -EINVAL;
1265         }
1266
1267         size = fh->video_fmt.sizeimage;
1268         if (0 != buf->vb.baddr && buf->vb.bsize < size) {
1269                 DEB_D(("size mismatch.\n"));
1270                 return -EINVAL;
1271         }
1272
1273         DEB_CAP(("buffer_prepare [size=%dx%d,bytes=%d,fields=%s]\n",
1274                 fh->video_fmt.width,fh->video_fmt.height,size,v4l2_field_names[fh->video_fmt.field]));
1275         if (buf->vb.width  != fh->video_fmt.width  ||
1276             buf->vb.bytesperline != fh->video_fmt.bytesperline ||
1277             buf->vb.height != fh->video_fmt.height ||
1278             buf->vb.size   != size ||
1279             buf->vb.field  != field      ||
1280             buf->vb.field  != fh->video_fmt.field  ||
1281             buf->fmt       != &fh->video_fmt) {
1282                 saa7146_dma_free(dev,buf);
1283         }
1284
1285         if (STATE_NEEDS_INIT == buf->vb.state) {
1286                 struct saa7146_format *sfmt;
1287
1288                 buf->vb.bytesperline  = fh->video_fmt.bytesperline;
1289                 buf->vb.width  = fh->video_fmt.width;
1290                 buf->vb.height = fh->video_fmt.height;
1291                 buf->vb.size   = size;
1292                 buf->vb.field  = field;
1293                 buf->fmt       = &fh->video_fmt;
1294                 buf->vb.field  = fh->video_fmt.field;
1295
1296                 sfmt = format_by_fourcc(dev,buf->fmt->pixelformat);
1297
1298                 if( 0 != IS_PLANAR(sfmt->trans)) {
1299                         saa7146_pgtable_free(dev->pci, &buf->pt[0]);
1300                         saa7146_pgtable_free(dev->pci, &buf->pt[1]);
1301                         saa7146_pgtable_free(dev->pci, &buf->pt[2]);
1302
1303                         saa7146_pgtable_alloc(dev->pci, &buf->pt[0]);
1304                         saa7146_pgtable_alloc(dev->pci, &buf->pt[1]);
1305                         saa7146_pgtable_alloc(dev->pci, &buf->pt[2]);
1306                 } else {
1307                         saa7146_pgtable_free(dev->pci, &buf->pt[0]);
1308                         saa7146_pgtable_alloc(dev->pci, &buf->pt[0]);
1309                 }
1310
1311                 err = videobuf_iolock(dev->pci,&buf->vb, &vv->ov_fb);
1312                 if (err)
1313                         goto oops;
1314                 err = saa7146_pgtable_build(dev,buf);
1315                 if (err)
1316                         goto oops;
1317         }
1318         buf->vb.state = STATE_PREPARED;
1319         buf->activate = buffer_activate;
1320
1321         return 0;
1322
1323  oops:
1324         DEB_D(("error out.\n"));
1325         saa7146_dma_free(dev,buf);
1326
1327         return err;
1328 }
1329
1330 static int buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
1331 {
1332         struct file *file = q->priv_data;
1333         struct saa7146_fh *fh = file->private_data;
1334
1335         if (0 == *count || *count > MAX_SAA7146_CAPTURE_BUFFERS)
1336                 *count = MAX_SAA7146_CAPTURE_BUFFERS;
1337
1338         *size = fh->video_fmt.sizeimage;
1339
1340         /* check if we exceed the "max_memory" parameter */
1341         if( (*count * *size) > (max_memory*1048576) ) {
1342                 *count = (max_memory*1048576) / *size;
1343         }
1344
1345         DEB_CAP(("%d buffers, %d bytes each.\n",*count,*size));
1346
1347         return 0;
1348 }
1349
1350 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
1351 {
1352         struct file *file = q->priv_data;
1353         struct saa7146_fh *fh = file->private_data;
1354         struct saa7146_dev *dev = fh->dev;
1355         struct saa7146_vv *vv = dev->vv_data;
1356         struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1357
1358         DEB_CAP(("vbuf:%p\n",vb));
1359         saa7146_buffer_queue(fh->dev,&vv->video_q,buf);
1360 }
1361
1362
1363 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
1364 {
1365         struct file *file = q->priv_data;
1366         struct saa7146_fh *fh = file->private_data;
1367         struct saa7146_dev *dev = fh->dev;
1368         struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1369
1370         DEB_CAP(("vbuf:%p\n",vb));
1371         saa7146_dma_free(dev,buf);
1372 }
1373
1374 static struct videobuf_queue_ops video_qops = {
1375         .buf_setup    = buffer_setup,
1376         .buf_prepare  = buffer_prepare,
1377         .buf_queue    = buffer_queue,
1378         .buf_release  = buffer_release,
1379 };
1380
1381 /********************************************************************************/
1382 /* file operations */
1383
1384 static void video_init(struct saa7146_dev *dev, struct saa7146_vv *vv)
1385 {
1386         INIT_LIST_HEAD(&vv->video_q.queue);
1387
1388         init_timer(&vv->video_q.timeout);
1389         vv->video_q.timeout.function = saa7146_buffer_timeout;
1390         vv->video_q.timeout.data     = (unsigned long)(&vv->video_q);
1391         vv->video_q.dev              = dev;
1392
1393         /* set some default values */
1394         vv->standard = &dev->ext_vv_data->stds[0];
1395
1396         /* FIXME: what's this? */
1397         vv->current_hps_source = SAA7146_HPS_SOURCE_PORT_A;
1398         vv->current_hps_sync = SAA7146_HPS_SYNC_PORT_A;
1399 }
1400
1401
1402 static int video_open(struct saa7146_dev *dev, struct file *file)
1403 {
1404         struct saa7146_fh *fh = (struct saa7146_fh *)file->private_data;
1405         struct saa7146_format *sfmt;
1406
1407         fh->video_fmt.width = 384;
1408         fh->video_fmt.height = 288;
1409         fh->video_fmt.pixelformat = V4L2_PIX_FMT_BGR24;
1410         fh->video_fmt.bytesperline = 0;
1411         fh->video_fmt.field = V4L2_FIELD_ANY;
1412         sfmt = format_by_fourcc(dev,fh->video_fmt.pixelformat);
1413         fh->video_fmt.sizeimage = (fh->video_fmt.width * fh->video_fmt.height * sfmt->depth)/8;
1414
1415         videobuf_queue_init(&fh->video_q, &video_qops,
1416                             dev->pci, &dev->slock,
1417                             V4L2_BUF_TYPE_VIDEO_CAPTURE,
1418                             V4L2_FIELD_INTERLACED,
1419                             sizeof(struct saa7146_buf),
1420                             file);
1421
1422         init_MUTEX(&fh->video_q.lock);
1423
1424         return 0;
1425 }
1426
1427
1428 static void video_close(struct saa7146_dev *dev, struct file *file)
1429 {
1430         struct saa7146_fh *fh = (struct saa7146_fh *)file->private_data;
1431         struct saa7146_vv *vv = dev->vv_data;
1432         int err;
1433
1434         if (IS_CAPTURE_ACTIVE(fh) != 0) {
1435                 err = video_end(fh, file);
1436         } else if (IS_OVERLAY_ACTIVE(fh) != 0) {
1437                 err = saa7146_stop_preview(fh);
1438         }
1439
1440         /* hmm, why is this function declared void? */
1441         /* return err */
1442 }
1443
1444
1445 static void video_irq_done(struct saa7146_dev *dev, unsigned long st)
1446 {
1447         struct saa7146_vv *vv = dev->vv_data;
1448         struct saa7146_dmaqueue *q = &vv->video_q;
1449
1450         spin_lock(&dev->slock);
1451         DEB_CAP(("called.\n"));
1452
1453         /* only finish the buffer if we have one... */
1454         if( NULL != q->curr ) {
1455                 saa7146_buffer_finish(dev,q,STATE_DONE);
1456         }
1457         saa7146_buffer_next(dev,q,0);
1458
1459         spin_unlock(&dev->slock);
1460 }
1461
1462 static ssize_t video_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
1463 {
1464         struct saa7146_fh *fh = file->private_data;
1465         struct saa7146_dev *dev = fh->dev;
1466         struct saa7146_vv *vv = dev->vv_data;
1467         ssize_t ret = 0;
1468
1469         DEB_EE(("called.\n"));
1470
1471         if ((vv->video_status & STATUS_CAPTURE) != 0) {
1472                 /* fixme: should we allow read() captures while streaming capture? */
1473                 if (vv->video_fh == fh) {
1474                         DEB_S(("already capturing.\n"));
1475                         return -EBUSY;
1476                 }
1477                 DEB_S(("already capturing in another open.\n"));
1478                 return -EBUSY;
1479         }
1480
1481         ret = video_begin(fh);
1482         if( 0 != ret) {
1483                 goto out;
1484         }
1485
1486         ret = videobuf_read_one(&fh->video_q , data, count, ppos,
1487                                 file->f_flags & O_NONBLOCK);
1488         if (ret != 0) {
1489                 video_end(fh, file);
1490         } else {
1491                 ret = video_end(fh, file);
1492         }
1493 out:
1494         /* restart overlay if it was active before */
1495         if (vv->ov_suspend != NULL) {
1496                 saa7146_start_preview(vv->ov_suspend);
1497                 vv->ov_suspend = NULL;
1498         }
1499
1500         return ret;
1501 }
1502
1503 struct saa7146_use_ops saa7146_video_uops = {
1504         .init = video_init,
1505         .open = video_open,
1506         .release = video_close,
1507         .irq_done = video_irq_done,
1508         .read = video_read,
1509 };