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[deliverable/linux.git] / drivers / media / common / saa7146_video.c
1 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
2
3 #include <media/saa7146_vv.h>
4 #include <media/v4l2-chip-ident.h>
5 #include <linux/module.h>
6
7 static int max_memory = 32;
8
9 module_param(max_memory, int, 0644);
10 MODULE_PARM_DESC(max_memory, "maximum memory usage for capture buffers (default: 32Mb)");
11
12 #define IS_CAPTURE_ACTIVE(fh) \
13 (((vv->video_status & STATUS_CAPTURE) != 0) && (vv->video_fh == fh))
14
15 #define IS_OVERLAY_ACTIVE(fh) \
16 (((vv->video_status & STATUS_OVERLAY) != 0) && (vv->video_fh == fh))
17
18 /* format descriptions for capture and preview */
19 static struct saa7146_format formats[] = {
20 {
21 .name = "RGB-8 (3-3-2)",
22 .pixelformat = V4L2_PIX_FMT_RGB332,
23 .trans = RGB08_COMPOSED,
24 .depth = 8,
25 .flags = 0,
26 }, {
27 .name = "RGB-16 (5/B-6/G-5/R)",
28 .pixelformat = V4L2_PIX_FMT_RGB565,
29 .trans = RGB16_COMPOSED,
30 .depth = 16,
31 .flags = 0,
32 }, {
33 .name = "RGB-24 (B-G-R)",
34 .pixelformat = V4L2_PIX_FMT_BGR24,
35 .trans = RGB24_COMPOSED,
36 .depth = 24,
37 .flags = 0,
38 }, {
39 .name = "RGB-32 (B-G-R)",
40 .pixelformat = V4L2_PIX_FMT_BGR32,
41 .trans = RGB32_COMPOSED,
42 .depth = 32,
43 .flags = 0,
44 }, {
45 .name = "RGB-32 (R-G-B)",
46 .pixelformat = V4L2_PIX_FMT_RGB32,
47 .trans = RGB32_COMPOSED,
48 .depth = 32,
49 .flags = 0,
50 .swap = 0x2,
51 }, {
52 .name = "Greyscale-8",
53 .pixelformat = V4L2_PIX_FMT_GREY,
54 .trans = Y8,
55 .depth = 8,
56 .flags = 0,
57 }, {
58 .name = "YUV 4:2:2 planar (Y-Cb-Cr)",
59 .pixelformat = V4L2_PIX_FMT_YUV422P,
60 .trans = YUV422_DECOMPOSED,
61 .depth = 16,
62 .flags = FORMAT_BYTE_SWAP|FORMAT_IS_PLANAR,
63 }, {
64 .name = "YVU 4:2:0 planar (Y-Cb-Cr)",
65 .pixelformat = V4L2_PIX_FMT_YVU420,
66 .trans = YUV420_DECOMPOSED,
67 .depth = 12,
68 .flags = FORMAT_BYTE_SWAP|FORMAT_IS_PLANAR,
69 }, {
70 .name = "YUV 4:2:0 planar (Y-Cb-Cr)",
71 .pixelformat = V4L2_PIX_FMT_YUV420,
72 .trans = YUV420_DECOMPOSED,
73 .depth = 12,
74 .flags = FORMAT_IS_PLANAR,
75 }, {
76 .name = "YUV 4:2:2 (U-Y-V-Y)",
77 .pixelformat = V4L2_PIX_FMT_UYVY,
78 .trans = YUV422_COMPOSED,
79 .depth = 16,
80 .flags = 0,
81 }
82 };
83
84 /* unfortunately, the saa7146 contains a bug which prevents it from doing on-the-fly byte swaps.
85 due to this, it's impossible to provide additional *packed* formats, which are simply byte swapped
86 (like V4L2_PIX_FMT_YUYV) ... 8-( */
87
88 static int NUM_FORMATS = sizeof(formats)/sizeof(struct saa7146_format);
89
90 struct saa7146_format* saa7146_format_by_fourcc(struct saa7146_dev *dev, int fourcc)
91 {
92 int i, j = NUM_FORMATS;
93
94 for (i = 0; i < j; i++) {
95 if (formats[i].pixelformat == fourcc) {
96 return formats+i;
97 }
98 }
99
100 DEB_D("unknown pixelformat:'%4.4s'\n", (char *)&fourcc);
101 return NULL;
102 }
103
104 static int vidioc_try_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f);
105
106 int saa7146_start_preview(struct saa7146_fh *fh)
107 {
108 struct saa7146_dev *dev = fh->dev;
109 struct saa7146_vv *vv = dev->vv_data;
110 struct v4l2_format fmt;
111 int ret = 0, err = 0;
112
113 DEB_EE("dev:%p, fh:%p\n", dev, fh);
114
115 /* check if we have overlay informations */
116 if( NULL == fh->ov.fh ) {
117 DEB_D("no overlay data available. try S_FMT first.\n");
118 return -EAGAIN;
119 }
120
121 /* check if streaming capture is running */
122 if (IS_CAPTURE_ACTIVE(fh) != 0) {
123 DEB_D("streaming capture is active\n");
124 return -EBUSY;
125 }
126
127 /* check if overlay is running */
128 if (IS_OVERLAY_ACTIVE(fh) != 0) {
129 if (vv->video_fh == fh) {
130 DEB_D("overlay is already active\n");
131 return 0;
132 }
133 DEB_D("overlay is already active in another open\n");
134 return -EBUSY;
135 }
136
137 if (0 == saa7146_res_get(fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP)) {
138 DEB_D("cannot get necessary overlay resources\n");
139 return -EBUSY;
140 }
141
142 fmt.fmt.win = fh->ov.win;
143 err = vidioc_try_fmt_vid_overlay(NULL, fh, &fmt);
144 if (0 != err) {
145 saa7146_res_free(vv->video_fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
146 return -EBUSY;
147 }
148 fh->ov.win = fmt.fmt.win;
149 vv->ov_data = &fh->ov;
150
151 DEB_D("%dx%d+%d+%d %s field=%s\n",
152 fh->ov.win.w.width, fh->ov.win.w.height,
153 fh->ov.win.w.left, fh->ov.win.w.top,
154 vv->ov_fmt->name, v4l2_field_names[fh->ov.win.field]);
155
156 if (0 != (ret = saa7146_enable_overlay(fh))) {
157 DEB_D("enabling overlay failed: %d\n", ret);
158 saa7146_res_free(vv->video_fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
159 return ret;
160 }
161
162 vv->video_status = STATUS_OVERLAY;
163 vv->video_fh = fh;
164
165 return 0;
166 }
167 EXPORT_SYMBOL_GPL(saa7146_start_preview);
168
169 int saa7146_stop_preview(struct saa7146_fh *fh)
170 {
171 struct saa7146_dev *dev = fh->dev;
172 struct saa7146_vv *vv = dev->vv_data;
173
174 DEB_EE("dev:%p, fh:%p\n", dev, fh);
175
176 /* check if streaming capture is running */
177 if (IS_CAPTURE_ACTIVE(fh) != 0) {
178 DEB_D("streaming capture is active\n");
179 return -EBUSY;
180 }
181
182 /* check if overlay is running at all */
183 if ((vv->video_status & STATUS_OVERLAY) == 0) {
184 DEB_D("no active overlay\n");
185 return 0;
186 }
187
188 if (vv->video_fh != fh) {
189 DEB_D("overlay is active, but in another open\n");
190 return -EBUSY;
191 }
192
193 vv->video_status = 0;
194 vv->video_fh = NULL;
195
196 saa7146_disable_overlay(fh);
197
198 saa7146_res_free(fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
199
200 return 0;
201 }
202 EXPORT_SYMBOL_GPL(saa7146_stop_preview);
203
204 /********************************************************************************/
205 /* common pagetable functions */
206
207 static int saa7146_pgtable_build(struct saa7146_dev *dev, struct saa7146_buf *buf)
208 {
209 struct pci_dev *pci = dev->pci;
210 struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
211 struct scatterlist *list = dma->sglist;
212 int length = dma->sglen;
213 struct saa7146_format *sfmt = saa7146_format_by_fourcc(dev,buf->fmt->pixelformat);
214
215 DEB_EE("dev:%p, buf:%p, sg_len:%d\n", dev, buf, length);
216
217 if( 0 != IS_PLANAR(sfmt->trans)) {
218 struct saa7146_pgtable *pt1 = &buf->pt[0];
219 struct saa7146_pgtable *pt2 = &buf->pt[1];
220 struct saa7146_pgtable *pt3 = &buf->pt[2];
221 __le32 *ptr1, *ptr2, *ptr3;
222 __le32 fill;
223
224 int size = buf->fmt->width*buf->fmt->height;
225 int i,p,m1,m2,m3,o1,o2;
226
227 switch( sfmt->depth ) {
228 case 12: {
229 /* create some offsets inside the page table */
230 m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
231 m2 = ((size+(size/4)+PAGE_SIZE)/PAGE_SIZE)-1;
232 m3 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
233 o1 = size%PAGE_SIZE;
234 o2 = (size+(size/4))%PAGE_SIZE;
235 DEB_CAP("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",
236 size, m1, m2, m3, o1, o2);
237 break;
238 }
239 case 16: {
240 /* create some offsets inside the page table */
241 m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
242 m2 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
243 m3 = ((2*size+PAGE_SIZE)/PAGE_SIZE)-1;
244 o1 = size%PAGE_SIZE;
245 o2 = (size+(size/2))%PAGE_SIZE;
246 DEB_CAP("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",
247 size, m1, m2, m3, o1, o2);
248 break;
249 }
250 default: {
251 return -1;
252 }
253 }
254
255 ptr1 = pt1->cpu;
256 ptr2 = pt2->cpu;
257 ptr3 = pt3->cpu;
258
259 /* walk all pages, copy all page addresses to ptr1 */
260 for (i = 0; i < length; i++, list++) {
261 for (p = 0; p * 4096 < list->length; p++, ptr1++) {
262 *ptr1 = cpu_to_le32(sg_dma_address(list) - list->offset);
263 }
264 }
265 /*
266 ptr1 = pt1->cpu;
267 for(j=0;j<40;j++) {
268 printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
269 }
270 */
271
272 /* if we have a user buffer, the first page may not be
273 aligned to a page boundary. */
274 pt1->offset = dma->sglist->offset;
275 pt2->offset = pt1->offset+o1;
276 pt3->offset = pt1->offset+o2;
277
278 /* create video-dma2 page table */
279 ptr1 = pt1->cpu;
280 for(i = m1; i <= m2 ; i++, ptr2++) {
281 *ptr2 = ptr1[i];
282 }
283 fill = *(ptr2-1);
284 for(;i<1024;i++,ptr2++) {
285 *ptr2 = fill;
286 }
287 /* create video-dma3 page table */
288 ptr1 = pt1->cpu;
289 for(i = m2; i <= m3; i++,ptr3++) {
290 *ptr3 = ptr1[i];
291 }
292 fill = *(ptr3-1);
293 for(;i<1024;i++,ptr3++) {
294 *ptr3 = fill;
295 }
296 /* finally: finish up video-dma1 page table */
297 ptr1 = pt1->cpu+m1;
298 fill = pt1->cpu[m1];
299 for(i=m1;i<1024;i++,ptr1++) {
300 *ptr1 = fill;
301 }
302 /*
303 ptr1 = pt1->cpu;
304 ptr2 = pt2->cpu;
305 ptr3 = pt3->cpu;
306 for(j=0;j<40;j++) {
307 printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
308 }
309 for(j=0;j<40;j++) {
310 printk("ptr2 %d: 0x%08x\n",j,ptr2[j]);
311 }
312 for(j=0;j<40;j++) {
313 printk("ptr3 %d: 0x%08x\n",j,ptr3[j]);
314 }
315 */
316 } else {
317 struct saa7146_pgtable *pt = &buf->pt[0];
318 return saa7146_pgtable_build_single(pci, pt, list, length);
319 }
320
321 return 0;
322 }
323
324
325 /********************************************************************************/
326 /* file operations */
327
328 static int video_begin(struct saa7146_fh *fh)
329 {
330 struct saa7146_dev *dev = fh->dev;
331 struct saa7146_vv *vv = dev->vv_data;
332 struct saa7146_format *fmt = NULL;
333 unsigned int resource;
334 int ret = 0, err = 0;
335
336 DEB_EE("dev:%p, fh:%p\n", dev, fh);
337
338 if ((vv->video_status & STATUS_CAPTURE) != 0) {
339 if (vv->video_fh == fh) {
340 DEB_S("already capturing\n");
341 return 0;
342 }
343 DEB_S("already capturing in another open\n");
344 return -EBUSY;
345 }
346
347 if ((vv->video_status & STATUS_OVERLAY) != 0) {
348 DEB_S("warning: suspending overlay video for streaming capture\n");
349 vv->ov_suspend = vv->video_fh;
350 err = saa7146_stop_preview(vv->video_fh); /* side effect: video_status is now 0, video_fh is NULL */
351 if (0 != err) {
352 DEB_D("suspending video failed. aborting\n");
353 return err;
354 }
355 }
356
357 fmt = saa7146_format_by_fourcc(dev,fh->video_fmt.pixelformat);
358 /* we need to have a valid format set here */
359 BUG_ON(NULL == fmt);
360
361 if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
362 resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
363 } else {
364 resource = RESOURCE_DMA1_HPS;
365 }
366
367 ret = saa7146_res_get(fh, resource);
368 if (0 == ret) {
369 DEB_S("cannot get capture resource %d\n", resource);
370 if (vv->ov_suspend != NULL) {
371 saa7146_start_preview(vv->ov_suspend);
372 vv->ov_suspend = NULL;
373 }
374 return -EBUSY;
375 }
376
377 /* clear out beginning of streaming bit (rps register 0)*/
378 saa7146_write(dev, MC2, MASK_27 );
379
380 /* enable rps0 irqs */
381 SAA7146_IER_ENABLE(dev, MASK_27);
382
383 vv->video_fh = fh;
384 vv->video_status = STATUS_CAPTURE;
385
386 return 0;
387 }
388
389 static int video_end(struct saa7146_fh *fh, struct file *file)
390 {
391 struct saa7146_dev *dev = fh->dev;
392 struct saa7146_vv *vv = dev->vv_data;
393 struct saa7146_format *fmt = NULL;
394 unsigned long flags;
395 unsigned int resource;
396 u32 dmas = 0;
397 DEB_EE("dev:%p, fh:%p\n", dev, fh);
398
399 if ((vv->video_status & STATUS_CAPTURE) != STATUS_CAPTURE) {
400 DEB_S("not capturing\n");
401 return 0;
402 }
403
404 if (vv->video_fh != fh) {
405 DEB_S("capturing, but in another open\n");
406 return -EBUSY;
407 }
408
409 fmt = saa7146_format_by_fourcc(dev,fh->video_fmt.pixelformat);
410 /* we need to have a valid format set here */
411 BUG_ON(NULL == fmt);
412
413 if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
414 resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
415 dmas = MASK_22 | MASK_21 | MASK_20;
416 } else {
417 resource = RESOURCE_DMA1_HPS;
418 dmas = MASK_22;
419 }
420 spin_lock_irqsave(&dev->slock,flags);
421
422 /* disable rps0 */
423 saa7146_write(dev, MC1, MASK_28);
424
425 /* disable rps0 irqs */
426 SAA7146_IER_DISABLE(dev, MASK_27);
427
428 /* shut down all used video dma transfers */
429 saa7146_write(dev, MC1, dmas);
430
431 spin_unlock_irqrestore(&dev->slock, flags);
432
433 vv->video_fh = NULL;
434 vv->video_status = 0;
435
436 saa7146_res_free(fh, resource);
437
438 if (vv->ov_suspend != NULL) {
439 saa7146_start_preview(vv->ov_suspend);
440 vv->ov_suspend = NULL;
441 }
442
443 return 0;
444 }
445
446 static int vidioc_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
447 {
448 struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
449
450 strcpy((char *)cap->driver, "saa7146 v4l2");
451 strlcpy((char *)cap->card, dev->ext->name, sizeof(cap->card));
452 sprintf((char *)cap->bus_info, "PCI:%s", pci_name(dev->pci));
453 cap->version = SAA7146_VERSION_CODE;
454 cap->device_caps =
455 V4L2_CAP_VIDEO_CAPTURE |
456 V4L2_CAP_VIDEO_OVERLAY |
457 V4L2_CAP_READWRITE |
458 V4L2_CAP_STREAMING;
459 cap->device_caps |= dev->ext_vv_data->capabilities;
460 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
461 return 0;
462 }
463
464 static int vidioc_g_fbuf(struct file *file, void *fh, struct v4l2_framebuffer *fb)
465 {
466 struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
467 struct saa7146_vv *vv = dev->vv_data;
468
469 *fb = vv->ov_fb;
470 fb->capability = V4L2_FBUF_CAP_LIST_CLIPPING;
471 return 0;
472 }
473
474 static int vidioc_s_fbuf(struct file *file, void *fh, struct v4l2_framebuffer *fb)
475 {
476 struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
477 struct saa7146_vv *vv = dev->vv_data;
478 struct saa7146_format *fmt;
479
480 DEB_EE("VIDIOC_S_FBUF\n");
481
482 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
483 return -EPERM;
484
485 /* check args */
486 fmt = saa7146_format_by_fourcc(dev, fb->fmt.pixelformat);
487 if (NULL == fmt)
488 return -EINVAL;
489
490 /* planar formats are not allowed for overlay video, clipping and video dma would clash */
491 if (fmt->flags & FORMAT_IS_PLANAR)
492 DEB_S("planar pixelformat '%4.4s' not allowed for overlay\n",
493 (char *)&fmt->pixelformat);
494
495 /* check if overlay is running */
496 if (IS_OVERLAY_ACTIVE(fh) != 0) {
497 if (vv->video_fh != fh) {
498 DEB_D("refusing to change framebuffer informations while overlay is active in another open\n");
499 return -EBUSY;
500 }
501 }
502
503 /* ok, accept it */
504 vv->ov_fb = *fb;
505 vv->ov_fmt = fmt;
506
507 if (vv->ov_fb.fmt.bytesperline < vv->ov_fb.fmt.width) {
508 vv->ov_fb.fmt.bytesperline = vv->ov_fb.fmt.width * fmt->depth / 8;
509 DEB_D("setting bytesperline to %d\n", vv->ov_fb.fmt.bytesperline);
510 }
511 return 0;
512 }
513
514 static int vidioc_enum_fmt_vid_cap(struct file *file, void *fh, struct v4l2_fmtdesc *f)
515 {
516 if (f->index >= NUM_FORMATS)
517 return -EINVAL;
518 strlcpy((char *)f->description, formats[f->index].name,
519 sizeof(f->description));
520 f->pixelformat = formats[f->index].pixelformat;
521 return 0;
522 }
523
524 int saa7146_s_ctrl(struct v4l2_ctrl *ctrl)
525 {
526 struct saa7146_dev *dev = container_of(ctrl->handler,
527 struct saa7146_dev, ctrl_handler);
528 struct saa7146_vv *vv = dev->vv_data;
529 u32 val;
530
531 switch (ctrl->id) {
532 case V4L2_CID_BRIGHTNESS:
533 val = saa7146_read(dev, BCS_CTRL);
534 val &= 0x00ffffff;
535 val |= (ctrl->val << 24);
536 saa7146_write(dev, BCS_CTRL, val);
537 saa7146_write(dev, MC2, MASK_22 | MASK_06);
538 break;
539
540 case V4L2_CID_CONTRAST:
541 val = saa7146_read(dev, BCS_CTRL);
542 val &= 0xff00ffff;
543 val |= (ctrl->val << 16);
544 saa7146_write(dev, BCS_CTRL, val);
545 saa7146_write(dev, MC2, MASK_22 | MASK_06);
546 break;
547
548 case V4L2_CID_SATURATION:
549 val = saa7146_read(dev, BCS_CTRL);
550 val &= 0xffffff00;
551 val |= (ctrl->val << 0);
552 saa7146_write(dev, BCS_CTRL, val);
553 saa7146_write(dev, MC2, MASK_22 | MASK_06);
554 break;
555
556 case V4L2_CID_HFLIP:
557 /* fixme: we can support changing VFLIP and HFLIP here... */
558 if ((vv->video_status & STATUS_CAPTURE))
559 return -EBUSY;
560 vv->hflip = ctrl->val;
561 break;
562
563 case V4L2_CID_VFLIP:
564 if ((vv->video_status & STATUS_CAPTURE))
565 return -EBUSY;
566 vv->vflip = ctrl->val;
567 break;
568
569 default:
570 return -EINVAL;
571 }
572
573 if ((vv->video_status & STATUS_OVERLAY) != 0) { /* CHECK: && (vv->video_fh == fh)) */
574 struct saa7146_fh *fh = vv->video_fh;
575
576 saa7146_stop_preview(fh);
577 saa7146_start_preview(fh);
578 }
579 return 0;
580 }
581
582 static int vidioc_g_parm(struct file *file, void *fh,
583 struct v4l2_streamparm *parm)
584 {
585 struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
586 struct saa7146_vv *vv = dev->vv_data;
587
588 if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
589 return -EINVAL;
590 parm->parm.capture.readbuffers = 1;
591 v4l2_video_std_frame_period(vv->standard->id,
592 &parm->parm.capture.timeperframe);
593 return 0;
594 }
595
596 static int vidioc_g_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f)
597 {
598 f->fmt.pix = ((struct saa7146_fh *)fh)->video_fmt;
599 return 0;
600 }
601
602 static int vidioc_g_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f)
603 {
604 f->fmt.win = ((struct saa7146_fh *)fh)->ov.win;
605 return 0;
606 }
607
608 static int vidioc_g_fmt_vbi_cap(struct file *file, void *fh, struct v4l2_format *f)
609 {
610 f->fmt.vbi = ((struct saa7146_fh *)fh)->vbi_fmt;
611 return 0;
612 }
613
614 static int vidioc_try_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f)
615 {
616 struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
617 struct saa7146_vv *vv = dev->vv_data;
618 struct saa7146_format *fmt;
619 enum v4l2_field field;
620 int maxw, maxh;
621 int calc_bpl;
622
623 DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: dev:%p, fh:%p\n", dev, fh);
624
625 fmt = saa7146_format_by_fourcc(dev, f->fmt.pix.pixelformat);
626 if (NULL == fmt)
627 return -EINVAL;
628
629 field = f->fmt.pix.field;
630 maxw = vv->standard->h_max_out;
631 maxh = vv->standard->v_max_out;
632
633 if (V4L2_FIELD_ANY == field) {
634 field = (f->fmt.pix.height > maxh / 2)
635 ? V4L2_FIELD_INTERLACED
636 : V4L2_FIELD_BOTTOM;
637 }
638 switch (field) {
639 case V4L2_FIELD_ALTERNATE:
640 vv->last_field = V4L2_FIELD_TOP;
641 maxh = maxh / 2;
642 break;
643 case V4L2_FIELD_TOP:
644 case V4L2_FIELD_BOTTOM:
645 vv->last_field = V4L2_FIELD_INTERLACED;
646 maxh = maxh / 2;
647 break;
648 case V4L2_FIELD_INTERLACED:
649 vv->last_field = V4L2_FIELD_INTERLACED;
650 break;
651 default:
652 DEB_D("no known field mode '%d'\n", field);
653 return -EINVAL;
654 }
655
656 f->fmt.pix.field = field;
657 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
658 if (f->fmt.pix.width > maxw)
659 f->fmt.pix.width = maxw;
660 if (f->fmt.pix.height > maxh)
661 f->fmt.pix.height = maxh;
662
663 calc_bpl = (f->fmt.pix.width * fmt->depth) / 8;
664
665 if (f->fmt.pix.bytesperline < calc_bpl)
666 f->fmt.pix.bytesperline = calc_bpl;
667
668 if (f->fmt.pix.bytesperline > (2 * PAGE_SIZE * fmt->depth) / 8) /* arbitrary constraint */
669 f->fmt.pix.bytesperline = calc_bpl;
670
671 f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * f->fmt.pix.height;
672 DEB_D("w:%d, h:%d, bytesperline:%d, sizeimage:%d\n",
673 f->fmt.pix.width, f->fmt.pix.height,
674 f->fmt.pix.bytesperline, f->fmt.pix.sizeimage);
675
676 return 0;
677 }
678
679
680 static int vidioc_try_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f)
681 {
682 struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
683 struct saa7146_vv *vv = dev->vv_data;
684 struct v4l2_window *win = &f->fmt.win;
685 enum v4l2_field field;
686 int maxw, maxh;
687
688 DEB_EE("dev:%p\n", dev);
689
690 if (NULL == vv->ov_fb.base) {
691 DEB_D("no fb base set\n");
692 return -EINVAL;
693 }
694 if (NULL == vv->ov_fmt) {
695 DEB_D("no fb fmt set\n");
696 return -EINVAL;
697 }
698 if (win->w.width < 48 || win->w.height < 32) {
699 DEB_D("min width/height. (%d,%d)\n",
700 win->w.width, win->w.height);
701 return -EINVAL;
702 }
703 if (win->clipcount > 16) {
704 DEB_D("clipcount too big\n");
705 return -EINVAL;
706 }
707
708 field = win->field;
709 maxw = vv->standard->h_max_out;
710 maxh = vv->standard->v_max_out;
711
712 if (V4L2_FIELD_ANY == field) {
713 field = (win->w.height > maxh / 2)
714 ? V4L2_FIELD_INTERLACED
715 : V4L2_FIELD_TOP;
716 }
717 switch (field) {
718 case V4L2_FIELD_TOP:
719 case V4L2_FIELD_BOTTOM:
720 case V4L2_FIELD_ALTERNATE:
721 maxh = maxh / 2;
722 break;
723 case V4L2_FIELD_INTERLACED:
724 break;
725 default:
726 DEB_D("no known field mode '%d'\n", field);
727 return -EINVAL;
728 }
729
730 win->field = field;
731 if (win->w.width > maxw)
732 win->w.width = maxw;
733 if (win->w.height > maxh)
734 win->w.height = maxh;
735
736 return 0;
737 }
738
739 static int vidioc_s_fmt_vid_cap(struct file *file, void *__fh, struct v4l2_format *f)
740 {
741 struct saa7146_fh *fh = __fh;
742 struct saa7146_dev *dev = fh->dev;
743 struct saa7146_vv *vv = dev->vv_data;
744 int err;
745
746 DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: dev:%p, fh:%p\n", dev, fh);
747 if (IS_CAPTURE_ACTIVE(fh) != 0) {
748 DEB_EE("streaming capture is active\n");
749 return -EBUSY;
750 }
751 err = vidioc_try_fmt_vid_cap(file, fh, f);
752 if (0 != err)
753 return err;
754 fh->video_fmt = f->fmt.pix;
755 DEB_EE("set to pixelformat '%4.4s'\n",
756 (char *)&fh->video_fmt.pixelformat);
757 return 0;
758 }
759
760 static int vidioc_s_fmt_vid_overlay(struct file *file, void *__fh, struct v4l2_format *f)
761 {
762 struct saa7146_fh *fh = __fh;
763 struct saa7146_dev *dev = fh->dev;
764 struct saa7146_vv *vv = dev->vv_data;
765 int err;
766
767 DEB_EE("V4L2_BUF_TYPE_VIDEO_OVERLAY: dev:%p, fh:%p\n", dev, fh);
768 err = vidioc_try_fmt_vid_overlay(file, fh, f);
769 if (0 != err)
770 return err;
771 fh->ov.win = f->fmt.win;
772 fh->ov.nclips = f->fmt.win.clipcount;
773 if (fh->ov.nclips > 16)
774 fh->ov.nclips = 16;
775 if (copy_from_user(fh->ov.clips, f->fmt.win.clips,
776 sizeof(struct v4l2_clip) * fh->ov.nclips)) {
777 return -EFAULT;
778 }
779
780 /* fh->ov.fh is used to indicate that we have valid overlay informations, too */
781 fh->ov.fh = fh;
782
783 /* check if our current overlay is active */
784 if (IS_OVERLAY_ACTIVE(fh) != 0) {
785 saa7146_stop_preview(fh);
786 saa7146_start_preview(fh);
787 }
788 return 0;
789 }
790
791 static int vidioc_g_std(struct file *file, void *fh, v4l2_std_id *norm)
792 {
793 struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
794 struct saa7146_vv *vv = dev->vv_data;
795
796 *norm = vv->standard->id;
797 return 0;
798 }
799
800 /* the saa7146 supfhrts (used in conjunction with the saa7111a for example)
801 PAL / NTSC / SECAM. if your hardware does not (or does more)
802 -- override this function in your extension */
803 /*
804 case VIDIOC_ENUMSTD:
805 {
806 struct v4l2_standard *e = arg;
807 if (e->index < 0 )
808 return -EINVAL;
809 if( e->index < dev->ext_vv_data->num_stds ) {
810 DEB_EE("VIDIOC_ENUMSTD: index:%d\n", e->index);
811 v4l2_video_std_construct(e, dev->ext_vv_data->stds[e->index].id, dev->ext_vv_data->stds[e->index].name);
812 return 0;
813 }
814 return -EINVAL;
815 }
816 */
817
818 static int vidioc_s_std(struct file *file, void *fh, v4l2_std_id *id)
819 {
820 struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
821 struct saa7146_vv *vv = dev->vv_data;
822 int found = 0;
823 int err, i;
824
825 DEB_EE("VIDIOC_S_STD\n");
826
827 if ((vv->video_status & STATUS_CAPTURE) == STATUS_CAPTURE) {
828 DEB_D("cannot change video standard while streaming capture is active\n");
829 return -EBUSY;
830 }
831
832 if ((vv->video_status & STATUS_OVERLAY) != 0) {
833 vv->ov_suspend = vv->video_fh;
834 err = saa7146_stop_preview(vv->video_fh); /* side effect: video_status is now 0, video_fh is NULL */
835 if (0 != err) {
836 DEB_D("suspending video failed. aborting\n");
837 return err;
838 }
839 }
840
841 for (i = 0; i < dev->ext_vv_data->num_stds; i++)
842 if (*id & dev->ext_vv_data->stds[i].id)
843 break;
844 if (i != dev->ext_vv_data->num_stds) {
845 vv->standard = &dev->ext_vv_data->stds[i];
846 if (NULL != dev->ext_vv_data->std_callback)
847 dev->ext_vv_data->std_callback(dev, vv->standard);
848 found = 1;
849 }
850
851 if (vv->ov_suspend != NULL) {
852 saa7146_start_preview(vv->ov_suspend);
853 vv->ov_suspend = NULL;
854 }
855
856 if (!found) {
857 DEB_EE("VIDIOC_S_STD: standard not found\n");
858 return -EINVAL;
859 }
860
861 DEB_EE("VIDIOC_S_STD: set to standard to '%s'\n", vv->standard->name);
862 return 0;
863 }
864
865 static int vidioc_overlay(struct file *file, void *fh, unsigned int on)
866 {
867 int err;
868
869 DEB_D("VIDIOC_OVERLAY on:%d\n", on);
870 if (on)
871 err = saa7146_start_preview(fh);
872 else
873 err = saa7146_stop_preview(fh);
874 return err;
875 }
876
877 static int vidioc_reqbufs(struct file *file, void *__fh, struct v4l2_requestbuffers *b)
878 {
879 struct saa7146_fh *fh = __fh;
880
881 if (b->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
882 return videobuf_reqbufs(&fh->video_q, b);
883 if (b->type == V4L2_BUF_TYPE_VBI_CAPTURE)
884 return videobuf_reqbufs(&fh->vbi_q, b);
885 return -EINVAL;
886 }
887
888 static int vidioc_querybuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
889 {
890 struct saa7146_fh *fh = __fh;
891
892 if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
893 return videobuf_querybuf(&fh->video_q, buf);
894 if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
895 return videobuf_querybuf(&fh->vbi_q, buf);
896 return -EINVAL;
897 }
898
899 static int vidioc_qbuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
900 {
901 struct saa7146_fh *fh = __fh;
902
903 if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
904 return videobuf_qbuf(&fh->video_q, buf);
905 if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
906 return videobuf_qbuf(&fh->vbi_q, buf);
907 return -EINVAL;
908 }
909
910 static int vidioc_dqbuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
911 {
912 struct saa7146_fh *fh = __fh;
913
914 if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
915 return videobuf_dqbuf(&fh->video_q, buf, file->f_flags & O_NONBLOCK);
916 if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
917 return videobuf_dqbuf(&fh->vbi_q, buf, file->f_flags & O_NONBLOCK);
918 return -EINVAL;
919 }
920
921 static int vidioc_streamon(struct file *file, void *__fh, enum v4l2_buf_type type)
922 {
923 struct saa7146_fh *fh = __fh;
924 int err;
925
926 DEB_D("VIDIOC_STREAMON, type:%d\n", type);
927
928 err = video_begin(fh);
929 if (err)
930 return err;
931 if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
932 return videobuf_streamon(&fh->video_q);
933 if (type == V4L2_BUF_TYPE_VBI_CAPTURE)
934 return videobuf_streamon(&fh->vbi_q);
935 return -EINVAL;
936 }
937
938 static int vidioc_streamoff(struct file *file, void *__fh, enum v4l2_buf_type type)
939 {
940 struct saa7146_fh *fh = __fh;
941 struct saa7146_dev *dev = fh->dev;
942 struct saa7146_vv *vv = dev->vv_data;
943 int err;
944
945 DEB_D("VIDIOC_STREAMOFF, type:%d\n", type);
946
947 /* ugly: we need to copy some checks from video_end(),
948 because videobuf_streamoff() relies on the capture running.
949 check and fix this */
950 if ((vv->video_status & STATUS_CAPTURE) != STATUS_CAPTURE) {
951 DEB_S("not capturing\n");
952 return 0;
953 }
954
955 if (vv->video_fh != fh) {
956 DEB_S("capturing, but in another open\n");
957 return -EBUSY;
958 }
959
960 err = -EINVAL;
961 if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
962 err = videobuf_streamoff(&fh->video_q);
963 else if (type == V4L2_BUF_TYPE_VBI_CAPTURE)
964 err = videobuf_streamoff(&fh->vbi_q);
965 if (0 != err) {
966 DEB_D("warning: videobuf_streamoff() failed\n");
967 video_end(fh, file);
968 } else {
969 err = video_end(fh, file);
970 }
971 return err;
972 }
973
974 static int vidioc_g_chip_ident(struct file *file, void *__fh,
975 struct v4l2_dbg_chip_ident *chip)
976 {
977 struct saa7146_fh *fh = __fh;
978 struct saa7146_dev *dev = fh->dev;
979
980 chip->ident = V4L2_IDENT_NONE;
981 chip->revision = 0;
982 if (chip->match.type == V4L2_CHIP_MATCH_HOST && !chip->match.addr) {
983 chip->ident = V4L2_IDENT_SAA7146;
984 return 0;
985 }
986 return v4l2_device_call_until_err(&dev->v4l2_dev, 0,
987 core, g_chip_ident, chip);
988 }
989
990 const struct v4l2_ioctl_ops saa7146_video_ioctl_ops = {
991 .vidioc_querycap = vidioc_querycap,
992 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
993 .vidioc_enum_fmt_vid_overlay = vidioc_enum_fmt_vid_cap,
994 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
995 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
996 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
997 .vidioc_g_fmt_vid_overlay = vidioc_g_fmt_vid_overlay,
998 .vidioc_try_fmt_vid_overlay = vidioc_try_fmt_vid_overlay,
999 .vidioc_s_fmt_vid_overlay = vidioc_s_fmt_vid_overlay,
1000 .vidioc_g_fmt_vbi_cap = vidioc_g_fmt_vbi_cap,
1001 .vidioc_g_chip_ident = vidioc_g_chip_ident,
1002
1003 .vidioc_overlay = vidioc_overlay,
1004 .vidioc_g_fbuf = vidioc_g_fbuf,
1005 .vidioc_s_fbuf = vidioc_s_fbuf,
1006 .vidioc_reqbufs = vidioc_reqbufs,
1007 .vidioc_querybuf = vidioc_querybuf,
1008 .vidioc_qbuf = vidioc_qbuf,
1009 .vidioc_dqbuf = vidioc_dqbuf,
1010 .vidioc_g_std = vidioc_g_std,
1011 .vidioc_s_std = vidioc_s_std,
1012 .vidioc_streamon = vidioc_streamon,
1013 .vidioc_streamoff = vidioc_streamoff,
1014 .vidioc_g_parm = vidioc_g_parm,
1015 };
1016
1017 /*********************************************************************************/
1018 /* buffer handling functions */
1019
1020 static int buffer_activate (struct saa7146_dev *dev,
1021 struct saa7146_buf *buf,
1022 struct saa7146_buf *next)
1023 {
1024 struct saa7146_vv *vv = dev->vv_data;
1025
1026 buf->vb.state = VIDEOBUF_ACTIVE;
1027 saa7146_set_capture(dev,buf,next);
1028
1029 mod_timer(&vv->video_q.timeout, jiffies+BUFFER_TIMEOUT);
1030 return 0;
1031 }
1032
1033 static void release_all_pagetables(struct saa7146_dev *dev, struct saa7146_buf *buf)
1034 {
1035 saa7146_pgtable_free(dev->pci, &buf->pt[0]);
1036 saa7146_pgtable_free(dev->pci, &buf->pt[1]);
1037 saa7146_pgtable_free(dev->pci, &buf->pt[2]);
1038 }
1039
1040 static int buffer_prepare(struct videobuf_queue *q,
1041 struct videobuf_buffer *vb, enum v4l2_field field)
1042 {
1043 struct file *file = q->priv_data;
1044 struct saa7146_fh *fh = file->private_data;
1045 struct saa7146_dev *dev = fh->dev;
1046 struct saa7146_vv *vv = dev->vv_data;
1047 struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1048 int size,err = 0;
1049
1050 DEB_CAP("vbuf:%p\n", vb);
1051
1052 /* sanity checks */
1053 if (fh->video_fmt.width < 48 ||
1054 fh->video_fmt.height < 32 ||
1055 fh->video_fmt.width > vv->standard->h_max_out ||
1056 fh->video_fmt.height > vv->standard->v_max_out) {
1057 DEB_D("w (%d) / h (%d) out of bounds\n",
1058 fh->video_fmt.width, fh->video_fmt.height);
1059 return -EINVAL;
1060 }
1061
1062 size = fh->video_fmt.sizeimage;
1063 if (0 != buf->vb.baddr && buf->vb.bsize < size) {
1064 DEB_D("size mismatch\n");
1065 return -EINVAL;
1066 }
1067
1068 DEB_CAP("buffer_prepare [size=%dx%d,bytes=%d,fields=%s]\n",
1069 fh->video_fmt.width, fh->video_fmt.height,
1070 size, v4l2_field_names[fh->video_fmt.field]);
1071 if (buf->vb.width != fh->video_fmt.width ||
1072 buf->vb.bytesperline != fh->video_fmt.bytesperline ||
1073 buf->vb.height != fh->video_fmt.height ||
1074 buf->vb.size != size ||
1075 buf->vb.field != field ||
1076 buf->vb.field != fh->video_fmt.field ||
1077 buf->fmt != &fh->video_fmt) {
1078 saa7146_dma_free(dev,q,buf);
1079 }
1080
1081 if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
1082 struct saa7146_format *sfmt;
1083
1084 buf->vb.bytesperline = fh->video_fmt.bytesperline;
1085 buf->vb.width = fh->video_fmt.width;
1086 buf->vb.height = fh->video_fmt.height;
1087 buf->vb.size = size;
1088 buf->vb.field = field;
1089 buf->fmt = &fh->video_fmt;
1090 buf->vb.field = fh->video_fmt.field;
1091
1092 sfmt = saa7146_format_by_fourcc(dev,buf->fmt->pixelformat);
1093
1094 release_all_pagetables(dev, buf);
1095 if( 0 != IS_PLANAR(sfmt->trans)) {
1096 saa7146_pgtable_alloc(dev->pci, &buf->pt[0]);
1097 saa7146_pgtable_alloc(dev->pci, &buf->pt[1]);
1098 saa7146_pgtable_alloc(dev->pci, &buf->pt[2]);
1099 } else {
1100 saa7146_pgtable_alloc(dev->pci, &buf->pt[0]);
1101 }
1102
1103 err = videobuf_iolock(q,&buf->vb, &vv->ov_fb);
1104 if (err)
1105 goto oops;
1106 err = saa7146_pgtable_build(dev,buf);
1107 if (err)
1108 goto oops;
1109 }
1110 buf->vb.state = VIDEOBUF_PREPARED;
1111 buf->activate = buffer_activate;
1112
1113 return 0;
1114
1115 oops:
1116 DEB_D("error out\n");
1117 saa7146_dma_free(dev,q,buf);
1118
1119 return err;
1120 }
1121
1122 static int buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
1123 {
1124 struct file *file = q->priv_data;
1125 struct saa7146_fh *fh = file->private_data;
1126
1127 if (0 == *count || *count > MAX_SAA7146_CAPTURE_BUFFERS)
1128 *count = MAX_SAA7146_CAPTURE_BUFFERS;
1129
1130 *size = fh->video_fmt.sizeimage;
1131
1132 /* check if we exceed the "max_memory" parameter */
1133 if( (*count * *size) > (max_memory*1048576) ) {
1134 *count = (max_memory*1048576) / *size;
1135 }
1136
1137 DEB_CAP("%d buffers, %d bytes each\n", *count, *size);
1138
1139 return 0;
1140 }
1141
1142 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
1143 {
1144 struct file *file = q->priv_data;
1145 struct saa7146_fh *fh = file->private_data;
1146 struct saa7146_dev *dev = fh->dev;
1147 struct saa7146_vv *vv = dev->vv_data;
1148 struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1149
1150 DEB_CAP("vbuf:%p\n", vb);
1151 saa7146_buffer_queue(fh->dev,&vv->video_q,buf);
1152 }
1153
1154 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
1155 {
1156 struct file *file = q->priv_data;
1157 struct saa7146_fh *fh = file->private_data;
1158 struct saa7146_dev *dev = fh->dev;
1159 struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1160
1161 DEB_CAP("vbuf:%p\n", vb);
1162
1163 saa7146_dma_free(dev,q,buf);
1164
1165 release_all_pagetables(dev, buf);
1166 }
1167
1168 static struct videobuf_queue_ops video_qops = {
1169 .buf_setup = buffer_setup,
1170 .buf_prepare = buffer_prepare,
1171 .buf_queue = buffer_queue,
1172 .buf_release = buffer_release,
1173 };
1174
1175 /********************************************************************************/
1176 /* file operations */
1177
1178 static void video_init(struct saa7146_dev *dev, struct saa7146_vv *vv)
1179 {
1180 INIT_LIST_HEAD(&vv->video_q.queue);
1181
1182 init_timer(&vv->video_q.timeout);
1183 vv->video_q.timeout.function = saa7146_buffer_timeout;
1184 vv->video_q.timeout.data = (unsigned long)(&vv->video_q);
1185 vv->video_q.dev = dev;
1186
1187 /* set some default values */
1188 vv->standard = &dev->ext_vv_data->stds[0];
1189
1190 /* FIXME: what's this? */
1191 vv->current_hps_source = SAA7146_HPS_SOURCE_PORT_A;
1192 vv->current_hps_sync = SAA7146_HPS_SYNC_PORT_A;
1193 }
1194
1195
1196 static int video_open(struct saa7146_dev *dev, struct file *file)
1197 {
1198 struct saa7146_fh *fh = file->private_data;
1199 struct saa7146_format *sfmt;
1200
1201 fh->video_fmt.width = 384;
1202 fh->video_fmt.height = 288;
1203 fh->video_fmt.pixelformat = V4L2_PIX_FMT_BGR24;
1204 fh->video_fmt.bytesperline = 0;
1205 fh->video_fmt.field = V4L2_FIELD_ANY;
1206 fh->video_fmt.colorspace = V4L2_COLORSPACE_SMPTE170M;
1207 sfmt = saa7146_format_by_fourcc(dev,fh->video_fmt.pixelformat);
1208 fh->video_fmt.sizeimage = (fh->video_fmt.width * fh->video_fmt.height * sfmt->depth)/8;
1209
1210 videobuf_queue_sg_init(&fh->video_q, &video_qops,
1211 &dev->pci->dev, &dev->slock,
1212 V4L2_BUF_TYPE_VIDEO_CAPTURE,
1213 V4L2_FIELD_INTERLACED,
1214 sizeof(struct saa7146_buf),
1215 file, &dev->v4l2_lock);
1216
1217 return 0;
1218 }
1219
1220
1221 static void video_close(struct saa7146_dev *dev, struct file *file)
1222 {
1223 struct saa7146_fh *fh = file->private_data;
1224 struct saa7146_vv *vv = dev->vv_data;
1225 struct videobuf_queue *q = &fh->video_q;
1226
1227 if (IS_CAPTURE_ACTIVE(fh) != 0)
1228 video_end(fh, file);
1229 else if (IS_OVERLAY_ACTIVE(fh) != 0)
1230 saa7146_stop_preview(fh);
1231
1232 videobuf_stop(q);
1233 /* hmm, why is this function declared void? */
1234 }
1235
1236
1237 static void video_irq_done(struct saa7146_dev *dev, unsigned long st)
1238 {
1239 struct saa7146_vv *vv = dev->vv_data;
1240 struct saa7146_dmaqueue *q = &vv->video_q;
1241
1242 spin_lock(&dev->slock);
1243 DEB_CAP("called\n");
1244
1245 /* only finish the buffer if we have one... */
1246 if( NULL != q->curr ) {
1247 saa7146_buffer_finish(dev,q,VIDEOBUF_DONE);
1248 }
1249 saa7146_buffer_next(dev,q,0);
1250
1251 spin_unlock(&dev->slock);
1252 }
1253
1254 static ssize_t video_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
1255 {
1256 struct saa7146_fh *fh = file->private_data;
1257 struct saa7146_dev *dev = fh->dev;
1258 struct saa7146_vv *vv = dev->vv_data;
1259 ssize_t ret = 0;
1260
1261 DEB_EE("called\n");
1262
1263 if ((vv->video_status & STATUS_CAPTURE) != 0) {
1264 /* fixme: should we allow read() captures while streaming capture? */
1265 if (vv->video_fh == fh) {
1266 DEB_S("already capturing\n");
1267 return -EBUSY;
1268 }
1269 DEB_S("already capturing in another open\n");
1270 return -EBUSY;
1271 }
1272
1273 ret = video_begin(fh);
1274 if( 0 != ret) {
1275 goto out;
1276 }
1277
1278 ret = videobuf_read_one(&fh->video_q , data, count, ppos,
1279 file->f_flags & O_NONBLOCK);
1280 if (ret != 0) {
1281 video_end(fh, file);
1282 } else {
1283 ret = video_end(fh, file);
1284 }
1285 out:
1286 /* restart overlay if it was active before */
1287 if (vv->ov_suspend != NULL) {
1288 saa7146_start_preview(vv->ov_suspend);
1289 vv->ov_suspend = NULL;
1290 }
1291
1292 return ret;
1293 }
1294
1295 struct saa7146_use_ops saa7146_video_uops = {
1296 .init = video_init,
1297 .open = video_open,
1298 .release = video_close,
1299 .irq_done = video_irq_done,
1300 .read = video_read,
1301 };
Linux kernel - Deliverables
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