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850799051bef7bf41cef5c749d6bf2a4120cc1fc
[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 information */
116 if (vv->ov.fh == NULL) {
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 = vv->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 vv->ov.win = fmt.fmt.win;
149
150 DEB_D("%dx%d+%d+%d %s field=%s\n",
151 vv->ov.win.w.width, vv->ov.win.w.height,
152 vv->ov.win.w.left, vv->ov.win.w.top,
153 vv->ov_fmt->name, v4l2_field_names[vv->ov.win.field]);
154
155 if (0 != (ret = saa7146_enable_overlay(fh))) {
156 DEB_D("enabling overlay failed: %d\n", ret);
157 saa7146_res_free(vv->video_fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
158 return ret;
159 }
160
161 vv->video_status = STATUS_OVERLAY;
162 vv->video_fh = fh;
163
164 return 0;
165 }
166 EXPORT_SYMBOL_GPL(saa7146_start_preview);
167
168 int saa7146_stop_preview(struct saa7146_fh *fh)
169 {
170 struct saa7146_dev *dev = fh->dev;
171 struct saa7146_vv *vv = dev->vv_data;
172
173 DEB_EE("dev:%p, fh:%p\n", dev, fh);
174
175 /* check if streaming capture is running */
176 if (IS_CAPTURE_ACTIVE(fh) != 0) {
177 DEB_D("streaming capture is active\n");
178 return -EBUSY;
179 }
180
181 /* check if overlay is running at all */
182 if ((vv->video_status & STATUS_OVERLAY) == 0) {
183 DEB_D("no active overlay\n");
184 return 0;
185 }
186
187 if (vv->video_fh != fh) {
188 DEB_D("overlay is active, but in another open\n");
189 return -EBUSY;
190 }
191
192 vv->video_status = 0;
193 vv->video_fh = NULL;
194
195 saa7146_disable_overlay(fh);
196
197 saa7146_res_free(fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
198
199 return 0;
200 }
201 EXPORT_SYMBOL_GPL(saa7146_stop_preview);
202
203 /********************************************************************************/
204 /* common pagetable functions */
205
206 static int saa7146_pgtable_build(struct saa7146_dev *dev, struct saa7146_buf *buf)
207 {
208 struct pci_dev *pci = dev->pci;
209 struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
210 struct scatterlist *list = dma->sglist;
211 int length = dma->sglen;
212 struct saa7146_format *sfmt = saa7146_format_by_fourcc(dev,buf->fmt->pixelformat);
213
214 DEB_EE("dev:%p, buf:%p, sg_len:%d\n", dev, buf, length);
215
216 if( 0 != IS_PLANAR(sfmt->trans)) {
217 struct saa7146_pgtable *pt1 = &buf->pt[0];
218 struct saa7146_pgtable *pt2 = &buf->pt[1];
219 struct saa7146_pgtable *pt3 = &buf->pt[2];
220 __le32 *ptr1, *ptr2, *ptr3;
221 __le32 fill;
222
223 int size = buf->fmt->width*buf->fmt->height;
224 int i,p,m1,m2,m3,o1,o2;
225
226 switch( sfmt->depth ) {
227 case 12: {
228 /* create some offsets inside the page table */
229 m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
230 m2 = ((size+(size/4)+PAGE_SIZE)/PAGE_SIZE)-1;
231 m3 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
232 o1 = size%PAGE_SIZE;
233 o2 = (size+(size/4))%PAGE_SIZE;
234 DEB_CAP("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",
235 size, m1, m2, m3, o1, o2);
236 break;
237 }
238 case 16: {
239 /* create some offsets inside the page table */
240 m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
241 m2 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
242 m3 = ((2*size+PAGE_SIZE)/PAGE_SIZE)-1;
243 o1 = size%PAGE_SIZE;
244 o2 = (size+(size/2))%PAGE_SIZE;
245 DEB_CAP("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",
246 size, m1, m2, m3, o1, o2);
247 break;
248 }
249 default: {
250 return -1;
251 }
252 }
253
254 ptr1 = pt1->cpu;
255 ptr2 = pt2->cpu;
256 ptr3 = pt3->cpu;
257
258 /* walk all pages, copy all page addresses to ptr1 */
259 for (i = 0; i < length; i++, list++) {
260 for (p = 0; p * 4096 < list->length; p++, ptr1++) {
261 *ptr1 = cpu_to_le32(sg_dma_address(list) - list->offset);
262 }
263 }
264 /*
265 ptr1 = pt1->cpu;
266 for(j=0;j<40;j++) {
267 printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
268 }
269 */
270
271 /* if we have a user buffer, the first page may not be
272 aligned to a page boundary. */
273 pt1->offset = dma->sglist->offset;
274 pt2->offset = pt1->offset+o1;
275 pt3->offset = pt1->offset+o2;
276
277 /* create video-dma2 page table */
278 ptr1 = pt1->cpu;
279 for(i = m1; i <= m2 ; i++, ptr2++) {
280 *ptr2 = ptr1[i];
281 }
282 fill = *(ptr2-1);
283 for(;i<1024;i++,ptr2++) {
284 *ptr2 = fill;
285 }
286 /* create video-dma3 page table */
287 ptr1 = pt1->cpu;
288 for(i = m2; i <= m3; i++,ptr3++) {
289 *ptr3 = ptr1[i];
290 }
291 fill = *(ptr3-1);
292 for(;i<1024;i++,ptr3++) {
293 *ptr3 = fill;
294 }
295 /* finally: finish up video-dma1 page table */
296 ptr1 = pt1->cpu+m1;
297 fill = pt1->cpu[m1];
298 for(i=m1;i<1024;i++,ptr1++) {
299 *ptr1 = fill;
300 }
301 /*
302 ptr1 = pt1->cpu;
303 ptr2 = pt2->cpu;
304 ptr3 = pt3->cpu;
305 for(j=0;j<40;j++) {
306 printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
307 }
308 for(j=0;j<40;j++) {
309 printk("ptr2 %d: 0x%08x\n",j,ptr2[j]);
310 }
311 for(j=0;j<40;j++) {
312 printk("ptr3 %d: 0x%08x\n",j,ptr3[j]);
313 }
314 */
315 } else {
316 struct saa7146_pgtable *pt = &buf->pt[0];
317 return saa7146_pgtable_build_single(pci, pt, list, length);
318 }
319
320 return 0;
321 }
322
323
324 /********************************************************************************/
325 /* file operations */
326
327 static int video_begin(struct saa7146_fh *fh)
328 {
329 struct saa7146_dev *dev = fh->dev;
330 struct saa7146_vv *vv = dev->vv_data;
331 struct saa7146_format *fmt = NULL;
332 unsigned int resource;
333 int ret = 0, err = 0;
334
335 DEB_EE("dev:%p, fh:%p\n", dev, fh);
336
337 if ((vv->video_status & STATUS_CAPTURE) != 0) {
338 if (vv->video_fh == fh) {
339 DEB_S("already capturing\n");
340 return 0;
341 }
342 DEB_S("already capturing in another open\n");
343 return -EBUSY;
344 }
345
346 if ((vv->video_status & STATUS_OVERLAY) != 0) {
347 DEB_S("warning: suspending overlay video for streaming capture\n");
348 vv->ov_suspend = vv->video_fh;
349 err = saa7146_stop_preview(vv->video_fh); /* side effect: video_status is now 0, video_fh is NULL */
350 if (0 != err) {
351 DEB_D("suspending video failed. aborting\n");
352 return err;
353 }
354 }
355
356 fmt = saa7146_format_by_fourcc(dev, vv->video_fmt.pixelformat);
357 /* we need to have a valid format set here */
358 BUG_ON(NULL == fmt);
359
360 if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
361 resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
362 } else {
363 resource = RESOURCE_DMA1_HPS;
364 }
365
366 ret = saa7146_res_get(fh, resource);
367 if (0 == ret) {
368 DEB_S("cannot get capture resource %d\n", resource);
369 if (vv->ov_suspend != NULL) {
370 saa7146_start_preview(vv->ov_suspend);
371 vv->ov_suspend = NULL;
372 }
373 return -EBUSY;
374 }
375
376 /* clear out beginning of streaming bit (rps register 0)*/
377 saa7146_write(dev, MC2, MASK_27 );
378
379 /* enable rps0 irqs */
380 SAA7146_IER_ENABLE(dev, MASK_27);
381
382 vv->video_fh = fh;
383 vv->video_status = STATUS_CAPTURE;
384
385 return 0;
386 }
387
388 static int video_end(struct saa7146_fh *fh, struct file *file)
389 {
390 struct saa7146_dev *dev = fh->dev;
391 struct saa7146_vv *vv = dev->vv_data;
392 struct saa7146_format *fmt = NULL;
393 unsigned long flags;
394 unsigned int resource;
395 u32 dmas = 0;
396 DEB_EE("dev:%p, fh:%p\n", dev, fh);
397
398 if ((vv->video_status & STATUS_CAPTURE) != STATUS_CAPTURE) {
399 DEB_S("not capturing\n");
400 return 0;
401 }
402
403 if (vv->video_fh != fh) {
404 DEB_S("capturing, but in another open\n");
405 return -EBUSY;
406 }
407
408 fmt = saa7146_format_by_fourcc(dev, vv->video_fmt.pixelformat);
409 /* we need to have a valid format set here */
410 BUG_ON(NULL == fmt);
411
412 if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
413 resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
414 dmas = MASK_22 | MASK_21 | MASK_20;
415 } else {
416 resource = RESOURCE_DMA1_HPS;
417 dmas = MASK_22;
418 }
419 spin_lock_irqsave(&dev->slock,flags);
420
421 /* disable rps0 */
422 saa7146_write(dev, MC1, MASK_28);
423
424 /* disable rps0 irqs */
425 SAA7146_IER_DISABLE(dev, MASK_27);
426
427 /* shut down all used video dma transfers */
428 saa7146_write(dev, MC1, dmas);
429
430 spin_unlock_irqrestore(&dev->slock, flags);
431
432 vv->video_fh = NULL;
433 vv->video_status = 0;
434
435 saa7146_res_free(fh, resource);
436
437 if (vv->ov_suspend != NULL) {
438 saa7146_start_preview(vv->ov_suspend);
439 vv->ov_suspend = NULL;
440 }
441
442 return 0;
443 }
444
445 static int vidioc_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
446 {
447 struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
448
449 strcpy((char *)cap->driver, "saa7146 v4l2");
450 strlcpy((char *)cap->card, dev->ext->name, sizeof(cap->card));
451 sprintf((char *)cap->bus_info, "PCI:%s", pci_name(dev->pci));
452 cap->version = SAA7146_VERSION_CODE;
453 cap->device_caps =
454 V4L2_CAP_VIDEO_CAPTURE |
455 V4L2_CAP_VIDEO_OVERLAY |
456 V4L2_CAP_READWRITE |
457 V4L2_CAP_STREAMING;
458 cap->device_caps |= dev->ext_vv_data->capabilities;
459 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
460 return 0;
461 }
462
463 static int vidioc_g_fbuf(struct file *file, void *fh, struct v4l2_framebuffer *fb)
464 {
465 struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
466 struct saa7146_vv *vv = dev->vv_data;
467
468 *fb = vv->ov_fb;
469 fb->capability = V4L2_FBUF_CAP_LIST_CLIPPING;
470 fb->flags = V4L2_FBUF_FLAG_PRIMARY;
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 struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
599 struct saa7146_vv *vv = dev->vv_data;
600
601 f->fmt.pix = vv->video_fmt;
602 return 0;
603 }
604
605 static int vidioc_g_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f)
606 {
607 struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
608 struct saa7146_vv *vv = dev->vv_data;
609
610 f->fmt.win = vv->ov.win;
611 return 0;
612 }
613
614 static int vidioc_g_fmt_vbi_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
619 f->fmt.vbi = vv->vbi_fmt;
620 return 0;
621 }
622
623 static int vidioc_try_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f)
624 {
625 struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
626 struct saa7146_vv *vv = dev->vv_data;
627 struct saa7146_format *fmt;
628 enum v4l2_field field;
629 int maxw, maxh;
630 int calc_bpl;
631
632 DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: dev:%p, fh:%p\n", dev, fh);
633
634 fmt = saa7146_format_by_fourcc(dev, f->fmt.pix.pixelformat);
635 if (NULL == fmt)
636 return -EINVAL;
637
638 field = f->fmt.pix.field;
639 maxw = vv->standard->h_max_out;
640 maxh = vv->standard->v_max_out;
641
642 if (V4L2_FIELD_ANY == field) {
643 field = (f->fmt.pix.height > maxh / 2)
644 ? V4L2_FIELD_INTERLACED
645 : V4L2_FIELD_BOTTOM;
646 }
647 switch (field) {
648 case V4L2_FIELD_ALTERNATE:
649 vv->last_field = V4L2_FIELD_TOP;
650 maxh = maxh / 2;
651 break;
652 case V4L2_FIELD_TOP:
653 case V4L2_FIELD_BOTTOM:
654 vv->last_field = V4L2_FIELD_INTERLACED;
655 maxh = maxh / 2;
656 break;
657 case V4L2_FIELD_INTERLACED:
658 vv->last_field = V4L2_FIELD_INTERLACED;
659 break;
660 default:
661 DEB_D("no known field mode '%d'\n", field);
662 return -EINVAL;
663 }
664
665 f->fmt.pix.field = field;
666 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
667 if (f->fmt.pix.width > maxw)
668 f->fmt.pix.width = maxw;
669 if (f->fmt.pix.height > maxh)
670 f->fmt.pix.height = maxh;
671
672 calc_bpl = (f->fmt.pix.width * fmt->depth) / 8;
673
674 if (f->fmt.pix.bytesperline < calc_bpl)
675 f->fmt.pix.bytesperline = calc_bpl;
676
677 if (f->fmt.pix.bytesperline > (2 * PAGE_SIZE * fmt->depth) / 8) /* arbitrary constraint */
678 f->fmt.pix.bytesperline = calc_bpl;
679
680 f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * f->fmt.pix.height;
681 DEB_D("w:%d, h:%d, bytesperline:%d, sizeimage:%d\n",
682 f->fmt.pix.width, f->fmt.pix.height,
683 f->fmt.pix.bytesperline, f->fmt.pix.sizeimage);
684
685 return 0;
686 }
687
688
689 static int vidioc_try_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f)
690 {
691 struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
692 struct saa7146_vv *vv = dev->vv_data;
693 struct v4l2_window *win = &f->fmt.win;
694 enum v4l2_field field;
695 int maxw, maxh;
696
697 DEB_EE("dev:%p\n", dev);
698
699 if (NULL == vv->ov_fb.base) {
700 DEB_D("no fb base set\n");
701 return -EINVAL;
702 }
703 if (NULL == vv->ov_fmt) {
704 DEB_D("no fb fmt set\n");
705 return -EINVAL;
706 }
707 if (win->w.width < 48 || win->w.height < 32) {
708 DEB_D("min width/height. (%d,%d)\n",
709 win->w.width, win->w.height);
710 return -EINVAL;
711 }
712 if (win->clipcount > 16) {
713 DEB_D("clipcount too big\n");
714 return -EINVAL;
715 }
716
717 field = win->field;
718 maxw = vv->standard->h_max_out;
719 maxh = vv->standard->v_max_out;
720
721 if (V4L2_FIELD_ANY == field) {
722 field = (win->w.height > maxh / 2)
723 ? V4L2_FIELD_INTERLACED
724 : V4L2_FIELD_TOP;
725 }
726 switch (field) {
727 case V4L2_FIELD_TOP:
728 case V4L2_FIELD_BOTTOM:
729 case V4L2_FIELD_ALTERNATE:
730 maxh = maxh / 2;
731 break;
732 case V4L2_FIELD_INTERLACED:
733 break;
734 default:
735 DEB_D("no known field mode '%d'\n", field);
736 return -EINVAL;
737 }
738
739 win->field = field;
740 if (win->w.width > maxw)
741 win->w.width = maxw;
742 if (win->w.height > maxh)
743 win->w.height = maxh;
744
745 return 0;
746 }
747
748 static int vidioc_s_fmt_vid_cap(struct file *file, void *__fh, struct v4l2_format *f)
749 {
750 struct saa7146_fh *fh = __fh;
751 struct saa7146_dev *dev = fh->dev;
752 struct saa7146_vv *vv = dev->vv_data;
753 int err;
754
755 DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: dev:%p, fh:%p\n", dev, fh);
756 if (IS_CAPTURE_ACTIVE(fh) != 0) {
757 DEB_EE("streaming capture is active\n");
758 return -EBUSY;
759 }
760 err = vidioc_try_fmt_vid_cap(file, fh, f);
761 if (0 != err)
762 return err;
763 vv->video_fmt = f->fmt.pix;
764 DEB_EE("set to pixelformat '%4.4s'\n",
765 (char *)&vv->video_fmt.pixelformat);
766 return 0;
767 }
768
769 static int vidioc_s_fmt_vid_overlay(struct file *file, void *__fh, struct v4l2_format *f)
770 {
771 struct saa7146_fh *fh = __fh;
772 struct saa7146_dev *dev = fh->dev;
773 struct saa7146_vv *vv = dev->vv_data;
774 int err;
775
776 DEB_EE("V4L2_BUF_TYPE_VIDEO_OVERLAY: dev:%p, fh:%p\n", dev, fh);
777 err = vidioc_try_fmt_vid_overlay(file, fh, f);
778 if (0 != err)
779 return err;
780 vv->ov.win = f->fmt.win;
781 vv->ov.nclips = f->fmt.win.clipcount;
782 if (vv->ov.nclips > 16)
783 vv->ov.nclips = 16;
784 if (copy_from_user(vv->ov.clips, f->fmt.win.clips,
785 sizeof(struct v4l2_clip) * vv->ov.nclips)) {
786 return -EFAULT;
787 }
788
789 /* vv->ov.fh is used to indicate that we have valid overlay informations, too */
790 vv->ov.fh = fh;
791
792 /* check if our current overlay is active */
793 if (IS_OVERLAY_ACTIVE(fh) != 0) {
794 saa7146_stop_preview(fh);
795 saa7146_start_preview(fh);
796 }
797 return 0;
798 }
799
800 static int vidioc_g_std(struct file *file, void *fh, v4l2_std_id *norm)
801 {
802 struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
803 struct saa7146_vv *vv = dev->vv_data;
804
805 *norm = vv->standard->id;
806 return 0;
807 }
808
809 /* the saa7146 supfhrts (used in conjunction with the saa7111a for example)
810 PAL / NTSC / SECAM. if your hardware does not (or does more)
811 -- override this function in your extension */
812 /*
813 case VIDIOC_ENUMSTD:
814 {
815 struct v4l2_standard *e = arg;
816 if (e->index < 0 )
817 return -EINVAL;
818 if( e->index < dev->ext_vv_data->num_stds ) {
819 DEB_EE("VIDIOC_ENUMSTD: index:%d\n", e->index);
820 v4l2_video_std_construct(e, dev->ext_vv_data->stds[e->index].id, dev->ext_vv_data->stds[e->index].name);
821 return 0;
822 }
823 return -EINVAL;
824 }
825 */
826
827 static int vidioc_s_std(struct file *file, void *fh, v4l2_std_id *id)
828 {
829 struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
830 struct saa7146_vv *vv = dev->vv_data;
831 int found = 0;
832 int err, i;
833
834 DEB_EE("VIDIOC_S_STD\n");
835
836 if ((vv->video_status & STATUS_CAPTURE) == STATUS_CAPTURE) {
837 DEB_D("cannot change video standard while streaming capture is active\n");
838 return -EBUSY;
839 }
840
841 if ((vv->video_status & STATUS_OVERLAY) != 0) {
842 vv->ov_suspend = vv->video_fh;
843 err = saa7146_stop_preview(vv->video_fh); /* side effect: video_status is now 0, video_fh is NULL */
844 if (0 != err) {
845 DEB_D("suspending video failed. aborting\n");
846 return err;
847 }
848 }
849
850 for (i = 0; i < dev->ext_vv_data->num_stds; i++)
851 if (*id & dev->ext_vv_data->stds[i].id)
852 break;
853 if (i != dev->ext_vv_data->num_stds) {
854 vv->standard = &dev->ext_vv_data->stds[i];
855 if (NULL != dev->ext_vv_data->std_callback)
856 dev->ext_vv_data->std_callback(dev, vv->standard);
857 found = 1;
858 }
859
860 if (vv->ov_suspend != NULL) {
861 saa7146_start_preview(vv->ov_suspend);
862 vv->ov_suspend = NULL;
863 }
864
865 if (!found) {
866 DEB_EE("VIDIOC_S_STD: standard not found\n");
867 return -EINVAL;
868 }
869
870 DEB_EE("VIDIOC_S_STD: set to standard to '%s'\n", vv->standard->name);
871 return 0;
872 }
873
874 static int vidioc_overlay(struct file *file, void *fh, unsigned int on)
875 {
876 int err;
877
878 DEB_D("VIDIOC_OVERLAY on:%d\n", on);
879 if (on)
880 err = saa7146_start_preview(fh);
881 else
882 err = saa7146_stop_preview(fh);
883 return err;
884 }
885
886 static int vidioc_reqbufs(struct file *file, void *__fh, struct v4l2_requestbuffers *b)
887 {
888 struct saa7146_fh *fh = __fh;
889
890 if (b->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
891 return videobuf_reqbufs(&fh->video_q, b);
892 if (b->type == V4L2_BUF_TYPE_VBI_CAPTURE)
893 return videobuf_reqbufs(&fh->vbi_q, b);
894 return -EINVAL;
895 }
896
897 static int vidioc_querybuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
898 {
899 struct saa7146_fh *fh = __fh;
900
901 if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
902 return videobuf_querybuf(&fh->video_q, buf);
903 if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
904 return videobuf_querybuf(&fh->vbi_q, buf);
905 return -EINVAL;
906 }
907
908 static int vidioc_qbuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
909 {
910 struct saa7146_fh *fh = __fh;
911
912 if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
913 return videobuf_qbuf(&fh->video_q, buf);
914 if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
915 return videobuf_qbuf(&fh->vbi_q, buf);
916 return -EINVAL;
917 }
918
919 static int vidioc_dqbuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
920 {
921 struct saa7146_fh *fh = __fh;
922
923 if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
924 return videobuf_dqbuf(&fh->video_q, buf, file->f_flags & O_NONBLOCK);
925 if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
926 return videobuf_dqbuf(&fh->vbi_q, buf, file->f_flags & O_NONBLOCK);
927 return -EINVAL;
928 }
929
930 static int vidioc_streamon(struct file *file, void *__fh, enum v4l2_buf_type type)
931 {
932 struct saa7146_fh *fh = __fh;
933 int err;
934
935 DEB_D("VIDIOC_STREAMON, type:%d\n", type);
936
937 err = video_begin(fh);
938 if (err)
939 return err;
940 if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
941 return videobuf_streamon(&fh->video_q);
942 if (type == V4L2_BUF_TYPE_VBI_CAPTURE)
943 return videobuf_streamon(&fh->vbi_q);
944 return -EINVAL;
945 }
946
947 static int vidioc_streamoff(struct file *file, void *__fh, enum v4l2_buf_type type)
948 {
949 struct saa7146_fh *fh = __fh;
950 struct saa7146_dev *dev = fh->dev;
951 struct saa7146_vv *vv = dev->vv_data;
952 int err;
953
954 DEB_D("VIDIOC_STREAMOFF, type:%d\n", type);
955
956 /* ugly: we need to copy some checks from video_end(),
957 because videobuf_streamoff() relies on the capture running.
958 check and fix this */
959 if ((vv->video_status & STATUS_CAPTURE) != STATUS_CAPTURE) {
960 DEB_S("not capturing\n");
961 return 0;
962 }
963
964 if (vv->video_fh != fh) {
965 DEB_S("capturing, but in another open\n");
966 return -EBUSY;
967 }
968
969 err = -EINVAL;
970 if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
971 err = videobuf_streamoff(&fh->video_q);
972 else if (type == V4L2_BUF_TYPE_VBI_CAPTURE)
973 err = videobuf_streamoff(&fh->vbi_q);
974 if (0 != err) {
975 DEB_D("warning: videobuf_streamoff() failed\n");
976 video_end(fh, file);
977 } else {
978 err = video_end(fh, file);
979 }
980 return err;
981 }
982
983 static int vidioc_g_chip_ident(struct file *file, void *__fh,
984 struct v4l2_dbg_chip_ident *chip)
985 {
986 struct saa7146_fh *fh = __fh;
987 struct saa7146_dev *dev = fh->dev;
988
989 chip->ident = V4L2_IDENT_NONE;
990 chip->revision = 0;
991 if (chip->match.type == V4L2_CHIP_MATCH_HOST && !chip->match.addr) {
992 chip->ident = V4L2_IDENT_SAA7146;
993 return 0;
994 }
995 return v4l2_device_call_until_err(&dev->v4l2_dev, 0,
996 core, g_chip_ident, chip);
997 }
998
999 const struct v4l2_ioctl_ops saa7146_video_ioctl_ops = {
1000 .vidioc_querycap = vidioc_querycap,
1001 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1002 .vidioc_enum_fmt_vid_overlay = vidioc_enum_fmt_vid_cap,
1003 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1004 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1005 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1006 .vidioc_g_fmt_vid_overlay = vidioc_g_fmt_vid_overlay,
1007 .vidioc_try_fmt_vid_overlay = vidioc_try_fmt_vid_overlay,
1008 .vidioc_s_fmt_vid_overlay = vidioc_s_fmt_vid_overlay,
1009 .vidioc_g_fmt_vbi_cap = vidioc_g_fmt_vbi_cap,
1010 .vidioc_g_chip_ident = vidioc_g_chip_ident,
1011
1012 .vidioc_overlay = vidioc_overlay,
1013 .vidioc_g_fbuf = vidioc_g_fbuf,
1014 .vidioc_s_fbuf = vidioc_s_fbuf,
1015 .vidioc_reqbufs = vidioc_reqbufs,
1016 .vidioc_querybuf = vidioc_querybuf,
1017 .vidioc_qbuf = vidioc_qbuf,
1018 .vidioc_dqbuf = vidioc_dqbuf,
1019 .vidioc_g_std = vidioc_g_std,
1020 .vidioc_s_std = vidioc_s_std,
1021 .vidioc_streamon = vidioc_streamon,
1022 .vidioc_streamoff = vidioc_streamoff,
1023 .vidioc_g_parm = vidioc_g_parm,
1024 };
1025
1026 /*********************************************************************************/
1027 /* buffer handling functions */
1028
1029 static int buffer_activate (struct saa7146_dev *dev,
1030 struct saa7146_buf *buf,
1031 struct saa7146_buf *next)
1032 {
1033 struct saa7146_vv *vv = dev->vv_data;
1034
1035 buf->vb.state = VIDEOBUF_ACTIVE;
1036 saa7146_set_capture(dev,buf,next);
1037
1038 mod_timer(&vv->video_dmaq.timeout, jiffies+BUFFER_TIMEOUT);
1039 return 0;
1040 }
1041
1042 static void release_all_pagetables(struct saa7146_dev *dev, struct saa7146_buf *buf)
1043 {
1044 saa7146_pgtable_free(dev->pci, &buf->pt[0]);
1045 saa7146_pgtable_free(dev->pci, &buf->pt[1]);
1046 saa7146_pgtable_free(dev->pci, &buf->pt[2]);
1047 }
1048
1049 static int buffer_prepare(struct videobuf_queue *q,
1050 struct videobuf_buffer *vb, enum v4l2_field field)
1051 {
1052 struct file *file = q->priv_data;
1053 struct saa7146_fh *fh = file->private_data;
1054 struct saa7146_dev *dev = fh->dev;
1055 struct saa7146_vv *vv = dev->vv_data;
1056 struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1057 int size,err = 0;
1058
1059 DEB_CAP("vbuf:%p\n", vb);
1060
1061 /* sanity checks */
1062 if (vv->video_fmt.width < 48 ||
1063 vv->video_fmt.height < 32 ||
1064 vv->video_fmt.width > vv->standard->h_max_out ||
1065 vv->video_fmt.height > vv->standard->v_max_out) {
1066 DEB_D("w (%d) / h (%d) out of bounds\n",
1067 vv->video_fmt.width, vv->video_fmt.height);
1068 return -EINVAL;
1069 }
1070
1071 size = vv->video_fmt.sizeimage;
1072 if (0 != buf->vb.baddr && buf->vb.bsize < size) {
1073 DEB_D("size mismatch\n");
1074 return -EINVAL;
1075 }
1076
1077 DEB_CAP("buffer_prepare [size=%dx%d,bytes=%d,fields=%s]\n",
1078 vv->video_fmt.width, vv->video_fmt.height,
1079 size, v4l2_field_names[vv->video_fmt.field]);
1080 if (buf->vb.width != vv->video_fmt.width ||
1081 buf->vb.bytesperline != vv->video_fmt.bytesperline ||
1082 buf->vb.height != vv->video_fmt.height ||
1083 buf->vb.size != size ||
1084 buf->vb.field != field ||
1085 buf->vb.field != vv->video_fmt.field ||
1086 buf->fmt != &vv->video_fmt) {
1087 saa7146_dma_free(dev,q,buf);
1088 }
1089
1090 if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
1091 struct saa7146_format *sfmt;
1092
1093 buf->vb.bytesperline = vv->video_fmt.bytesperline;
1094 buf->vb.width = vv->video_fmt.width;
1095 buf->vb.height = vv->video_fmt.height;
1096 buf->vb.size = size;
1097 buf->vb.field = field;
1098 buf->fmt = &vv->video_fmt;
1099 buf->vb.field = vv->video_fmt.field;
1100
1101 sfmt = saa7146_format_by_fourcc(dev,buf->fmt->pixelformat);
1102
1103 release_all_pagetables(dev, buf);
1104 if( 0 != IS_PLANAR(sfmt->trans)) {
1105 saa7146_pgtable_alloc(dev->pci, &buf->pt[0]);
1106 saa7146_pgtable_alloc(dev->pci, &buf->pt[1]);
1107 saa7146_pgtable_alloc(dev->pci, &buf->pt[2]);
1108 } else {
1109 saa7146_pgtable_alloc(dev->pci, &buf->pt[0]);
1110 }
1111
1112 err = videobuf_iolock(q,&buf->vb, &vv->ov_fb);
1113 if (err)
1114 goto oops;
1115 err = saa7146_pgtable_build(dev,buf);
1116 if (err)
1117 goto oops;
1118 }
1119 buf->vb.state = VIDEOBUF_PREPARED;
1120 buf->activate = buffer_activate;
1121
1122 return 0;
1123
1124 oops:
1125 DEB_D("error out\n");
1126 saa7146_dma_free(dev,q,buf);
1127
1128 return err;
1129 }
1130
1131 static int buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
1132 {
1133 struct file *file = q->priv_data;
1134 struct saa7146_fh *fh = file->private_data;
1135 struct saa7146_vv *vv = fh->dev->vv_data;
1136
1137 if (0 == *count || *count > MAX_SAA7146_CAPTURE_BUFFERS)
1138 *count = MAX_SAA7146_CAPTURE_BUFFERS;
1139
1140 *size = vv->video_fmt.sizeimage;
1141
1142 /* check if we exceed the "max_memory" parameter */
1143 if( (*count * *size) > (max_memory*1048576) ) {
1144 *count = (max_memory*1048576) / *size;
1145 }
1146
1147 DEB_CAP("%d buffers, %d bytes each\n", *count, *size);
1148
1149 return 0;
1150 }
1151
1152 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
1153 {
1154 struct file *file = q->priv_data;
1155 struct saa7146_fh *fh = file->private_data;
1156 struct saa7146_dev *dev = fh->dev;
1157 struct saa7146_vv *vv = dev->vv_data;
1158 struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1159
1160 DEB_CAP("vbuf:%p\n", vb);
1161 saa7146_buffer_queue(fh->dev, &vv->video_dmaq, buf);
1162 }
1163
1164 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
1165 {
1166 struct file *file = q->priv_data;
1167 struct saa7146_fh *fh = file->private_data;
1168 struct saa7146_dev *dev = fh->dev;
1169 struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1170
1171 DEB_CAP("vbuf:%p\n", vb);
1172
1173 saa7146_dma_free(dev,q,buf);
1174
1175 release_all_pagetables(dev, buf);
1176 }
1177
1178 static struct videobuf_queue_ops video_qops = {
1179 .buf_setup = buffer_setup,
1180 .buf_prepare = buffer_prepare,
1181 .buf_queue = buffer_queue,
1182 .buf_release = buffer_release,
1183 };
1184
1185 /********************************************************************************/
1186 /* file operations */
1187
1188 static void video_init(struct saa7146_dev *dev, struct saa7146_vv *vv)
1189 {
1190 INIT_LIST_HEAD(&vv->video_dmaq.queue);
1191
1192 init_timer(&vv->video_dmaq.timeout);
1193 vv->video_dmaq.timeout.function = saa7146_buffer_timeout;
1194 vv->video_dmaq.timeout.data = (unsigned long)(&vv->video_dmaq);
1195 vv->video_dmaq.dev = dev;
1196
1197 /* set some default values */
1198 vv->standard = &dev->ext_vv_data->stds[0];
1199
1200 /* FIXME: what's this? */
1201 vv->current_hps_source = SAA7146_HPS_SOURCE_PORT_A;
1202 vv->current_hps_sync = SAA7146_HPS_SYNC_PORT_A;
1203 }
1204
1205
1206 static int video_open(struct saa7146_dev *dev, struct file *file)
1207 {
1208 struct saa7146_fh *fh = file->private_data;
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_dmaq;
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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