Root/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 <media/v4l2-event.h>
6#include <media/v4l2-ctrls.h>
7#include <linux/module.h>
8
9static int max_memory = 32;
10
11module_param(max_memory, int, 0644);
12MODULE_PARM_DESC(max_memory, "maximum memory usage for capture buffers (default: 32Mb)");
13
14#define IS_CAPTURE_ACTIVE(fh) \
15    (((vv->video_status & STATUS_CAPTURE) != 0) && (vv->video_fh == fh))
16
17#define IS_OVERLAY_ACTIVE(fh) \
18    (((vv->video_status & STATUS_OVERLAY) != 0) && (vv->video_fh == fh))
19
20/* format descriptions for capture and preview */
21static struct saa7146_format formats[] = {
22    {
23        .name = "RGB-8 (3-3-2)",
24        .pixelformat = V4L2_PIX_FMT_RGB332,
25        .trans = RGB08_COMPOSED,
26        .depth = 8,
27        .flags = 0,
28    }, {
29        .name = "RGB-16 (5/B-6/G-5/R)",
30        .pixelformat = V4L2_PIX_FMT_RGB565,
31        .trans = RGB16_COMPOSED,
32        .depth = 16,
33        .flags = 0,
34    }, {
35        .name = "RGB-24 (B-G-R)",
36        .pixelformat = V4L2_PIX_FMT_BGR24,
37        .trans = RGB24_COMPOSED,
38        .depth = 24,
39        .flags = 0,
40    }, {
41        .name = "RGB-32 (B-G-R)",
42        .pixelformat = V4L2_PIX_FMT_BGR32,
43        .trans = RGB32_COMPOSED,
44        .depth = 32,
45        .flags = 0,
46    }, {
47        .name = "RGB-32 (R-G-B)",
48        .pixelformat = V4L2_PIX_FMT_RGB32,
49        .trans = RGB32_COMPOSED,
50        .depth = 32,
51        .flags = 0,
52        .swap = 0x2,
53    }, {
54        .name = "Greyscale-8",
55        .pixelformat = V4L2_PIX_FMT_GREY,
56        .trans = Y8,
57        .depth = 8,
58        .flags = 0,
59    }, {
60        .name = "YUV 4:2:2 planar (Y-Cb-Cr)",
61        .pixelformat = V4L2_PIX_FMT_YUV422P,
62        .trans = YUV422_DECOMPOSED,
63        .depth = 16,
64        .flags = FORMAT_BYTE_SWAP|FORMAT_IS_PLANAR,
65    }, {
66        .name = "YVU 4:2:0 planar (Y-Cb-Cr)",
67        .pixelformat = V4L2_PIX_FMT_YVU420,
68        .trans = YUV420_DECOMPOSED,
69        .depth = 12,
70        .flags = FORMAT_BYTE_SWAP|FORMAT_IS_PLANAR,
71    }, {
72        .name = "YUV 4:2:0 planar (Y-Cb-Cr)",
73        .pixelformat = V4L2_PIX_FMT_YUV420,
74        .trans = YUV420_DECOMPOSED,
75        .depth = 12,
76        .flags = FORMAT_IS_PLANAR,
77    }, {
78        .name = "YUV 4:2:2 (U-Y-V-Y)",
79        .pixelformat = V4L2_PIX_FMT_UYVY,
80        .trans = YUV422_COMPOSED,
81        .depth = 16,
82        .flags = 0,
83    }
84};
85
86/* unfortunately, the saa7146 contains a bug which prevents it from doing on-the-fly byte swaps.
87   due to this, it's impossible to provide additional *packed* formats, which are simply byte swapped
88   (like V4L2_PIX_FMT_YUYV) ... 8-( */
89
90static int NUM_FORMATS = sizeof(formats)/sizeof(struct saa7146_format);
91
92struct saa7146_format* saa7146_format_by_fourcc(struct saa7146_dev *dev, int fourcc)
93{
94    int i, j = NUM_FORMATS;
95
96    for (i = 0; i < j; i++) {
97        if (formats[i].pixelformat == fourcc) {
98            return formats+i;
99        }
100    }
101
102    DEB_D("unknown pixelformat:'%4.4s'\n", (char *)&fourcc);
103    return NULL;
104}
105
106static int vidioc_try_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f);
107
108int saa7146_start_preview(struct saa7146_fh *fh)
109{
110    struct saa7146_dev *dev = fh->dev;
111    struct saa7146_vv *vv = dev->vv_data;
112    struct v4l2_format fmt;
113    int ret = 0, err = 0;
114
115    DEB_EE("dev:%p, fh:%p\n", dev, fh);
116
117    /* check if we have overlay information */
118    if (vv->ov.fh == NULL) {
119        DEB_D("no overlay data available. try S_FMT first.\n");
120        return -EAGAIN;
121    }
122
123    /* check if streaming capture is running */
124    if (IS_CAPTURE_ACTIVE(fh) != 0) {
125        DEB_D("streaming capture is active\n");
126        return -EBUSY;
127    }
128
129    /* check if overlay is running */
130    if (IS_OVERLAY_ACTIVE(fh) != 0) {
131        if (vv->video_fh == fh) {
132            DEB_D("overlay is already active\n");
133            return 0;
134        }
135        DEB_D("overlay is already active in another open\n");
136        return -EBUSY;
137    }
138
139    if (0 == saa7146_res_get(fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP)) {
140        DEB_D("cannot get necessary overlay resources\n");
141        return -EBUSY;
142    }
143
144    fmt.fmt.win = vv->ov.win;
145    err = vidioc_try_fmt_vid_overlay(NULL, fh, &fmt);
146    if (0 != err) {
147        saa7146_res_free(vv->video_fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
148        return -EBUSY;
149    }
150    vv->ov.win = fmt.fmt.win;
151
152    DEB_D("%dx%d+%d+%d %s field=%s\n",
153          vv->ov.win.w.width, vv->ov.win.w.height,
154          vv->ov.win.w.left, vv->ov.win.w.top,
155          vv->ov_fmt->name, v4l2_field_names[vv->ov.win.field]);
156
157    if (0 != (ret = saa7146_enable_overlay(fh))) {
158        DEB_D("enabling overlay failed: %d\n", ret);
159        saa7146_res_free(vv->video_fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
160        return ret;
161    }
162
163    vv->video_status = STATUS_OVERLAY;
164    vv->video_fh = fh;
165
166    return 0;
167}
168EXPORT_SYMBOL_GPL(saa7146_start_preview);
169
170int saa7146_stop_preview(struct saa7146_fh *fh)
171{
172    struct saa7146_dev *dev = fh->dev;
173    struct saa7146_vv *vv = dev->vv_data;
174
175    DEB_EE("dev:%p, fh:%p\n", dev, fh);
176
177    /* check if streaming capture is running */
178    if (IS_CAPTURE_ACTIVE(fh) != 0) {
179        DEB_D("streaming capture is active\n");
180        return -EBUSY;
181    }
182
183    /* check if overlay is running at all */
184    if ((vv->video_status & STATUS_OVERLAY) == 0) {
185        DEB_D("no active overlay\n");
186        return 0;
187    }
188
189    if (vv->video_fh != fh) {
190        DEB_D("overlay is active, but in another open\n");
191        return -EBUSY;
192    }
193
194    vv->video_status = 0;
195    vv->video_fh = NULL;
196
197    saa7146_disable_overlay(fh);
198
199    saa7146_res_free(fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
200
201    return 0;
202}
203EXPORT_SYMBOL_GPL(saa7146_stop_preview);
204
205/********************************************************************************/
206/* common pagetable functions */
207
208static int saa7146_pgtable_build(struct saa7146_dev *dev, struct saa7146_buf *buf)
209{
210    struct pci_dev *pci = dev->pci;
211    struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
212    struct scatterlist *list = dma->sglist;
213    int length = dma->sglen;
214    struct saa7146_format *sfmt = saa7146_format_by_fourcc(dev,buf->fmt->pixelformat);
215
216    DEB_EE("dev:%p, buf:%p, sg_len:%d\n", dev, buf, length);
217
218    if( 0 != IS_PLANAR(sfmt->trans)) {
219        struct saa7146_pgtable *pt1 = &buf->pt[0];
220        struct saa7146_pgtable *pt2 = &buf->pt[1];
221        struct saa7146_pgtable *pt3 = &buf->pt[2];
222        __le32 *ptr1, *ptr2, *ptr3;
223        __le32 fill;
224
225        int size = buf->fmt->width*buf->fmt->height;
226        int i,p,m1,m2,m3,o1,o2;
227
228        switch( sfmt->depth ) {
229            case 12: {
230                /* create some offsets inside the page table */
231                m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
232                m2 = ((size+(size/4)+PAGE_SIZE)/PAGE_SIZE)-1;
233                m3 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
234                o1 = size%PAGE_SIZE;
235                o2 = (size+(size/4))%PAGE_SIZE;
236                DEB_CAP("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",
237                    size, m1, m2, m3, o1, o2);
238                break;
239            }
240            case 16: {
241                /* create some offsets inside the page table */
242                m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
243                m2 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
244                m3 = ((2*size+PAGE_SIZE)/PAGE_SIZE)-1;
245                o1 = size%PAGE_SIZE;
246                o2 = (size+(size/2))%PAGE_SIZE;
247                DEB_CAP("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",
248                    size, m1, m2, m3, o1, o2);
249                break;
250            }
251            default: {
252                return -1;
253            }
254        }
255
256        ptr1 = pt1->cpu;
257        ptr2 = pt2->cpu;
258        ptr3 = pt3->cpu;
259
260        /* walk all pages, copy all page addresses to ptr1 */
261        for (i = 0; i < length; i++, list++) {
262            for (p = 0; p * 4096 < list->length; p++, ptr1++) {
263                *ptr1 = cpu_to_le32(sg_dma_address(list) - list->offset);
264            }
265        }
266/*
267        ptr1 = pt1->cpu;
268        for(j=0;j<40;j++) {
269            printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
270        }
271*/
272
273        /* if we have a user buffer, the first page may not be
274           aligned to a page boundary. */
275        pt1->offset = dma->sglist->offset;
276        pt2->offset = pt1->offset+o1;
277        pt3->offset = pt1->offset+o2;
278
279        /* create video-dma2 page table */
280        ptr1 = pt1->cpu;
281        for(i = m1; i <= m2 ; i++, ptr2++) {
282            *ptr2 = ptr1[i];
283        }
284        fill = *(ptr2-1);
285        for(;i<1024;i++,ptr2++) {
286            *ptr2 = fill;
287        }
288        /* create video-dma3 page table */
289        ptr1 = pt1->cpu;
290        for(i = m2; i <= m3; i++,ptr3++) {
291            *ptr3 = ptr1[i];
292        }
293        fill = *(ptr3-1);
294        for(;i<1024;i++,ptr3++) {
295            *ptr3 = fill;
296        }
297        /* finally: finish up video-dma1 page table */
298        ptr1 = pt1->cpu+m1;
299        fill = pt1->cpu[m1];
300        for(i=m1;i<1024;i++,ptr1++) {
301            *ptr1 = fill;
302        }
303/*
304        ptr1 = pt1->cpu;
305        ptr2 = pt2->cpu;
306        ptr3 = pt3->cpu;
307        for(j=0;j<40;j++) {
308            printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
309        }
310        for(j=0;j<40;j++) {
311            printk("ptr2 %d: 0x%08x\n",j,ptr2[j]);
312        }
313        for(j=0;j<40;j++) {
314            printk("ptr3 %d: 0x%08x\n",j,ptr3[j]);
315        }
316*/
317    } else {
318        struct saa7146_pgtable *pt = &buf->pt[0];
319        return saa7146_pgtable_build_single(pci, pt, list, length);
320    }
321
322    return 0;
323}
324
325
326/********************************************************************************/
327/* file operations */
328
329static int video_begin(struct saa7146_fh *fh)
330{
331    struct saa7146_dev *dev = fh->dev;
332    struct saa7146_vv *vv = dev->vv_data;
333    struct saa7146_format *fmt = NULL;
334    unsigned int resource;
335    int ret = 0, err = 0;
336
337    DEB_EE("dev:%p, fh:%p\n", dev, fh);
338
339    if ((vv->video_status & STATUS_CAPTURE) != 0) {
340        if (vv->video_fh == fh) {
341            DEB_S("already capturing\n");
342            return 0;
343        }
344        DEB_S("already capturing in another open\n");
345        return -EBUSY;
346    }
347
348    if ((vv->video_status & STATUS_OVERLAY) != 0) {
349        DEB_S("warning: suspending overlay video for streaming capture\n");
350        vv->ov_suspend = vv->video_fh;
351        err = saa7146_stop_preview(vv->video_fh); /* side effect: video_status is now 0, video_fh is NULL */
352        if (0 != err) {
353            DEB_D("suspending video failed. aborting\n");
354            return err;
355        }
356    }
357
358    fmt = saa7146_format_by_fourcc(dev, vv->video_fmt.pixelformat);
359    /* we need to have a valid format set here */
360    BUG_ON(NULL == fmt);
361
362    if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
363        resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
364    } else {
365        resource = RESOURCE_DMA1_HPS;
366    }
367
368    ret = saa7146_res_get(fh, resource);
369    if (0 == ret) {
370        DEB_S("cannot get capture resource %d\n", resource);
371        if (vv->ov_suspend != NULL) {
372            saa7146_start_preview(vv->ov_suspend);
373            vv->ov_suspend = NULL;
374        }
375        return -EBUSY;
376    }
377
378    /* clear out beginning of streaming bit (rps register 0)*/
379    saa7146_write(dev, MC2, MASK_27 );
380
381    /* enable rps0 irqs */
382    SAA7146_IER_ENABLE(dev, MASK_27);
383
384    vv->video_fh = fh;
385    vv->video_status = STATUS_CAPTURE;
386
387    return 0;
388}
389
390static int video_end(struct saa7146_fh *fh, struct file *file)
391{
392    struct saa7146_dev *dev = fh->dev;
393    struct saa7146_vv *vv = dev->vv_data;
394    struct saa7146_format *fmt = NULL;
395    unsigned long flags;
396    unsigned int resource;
397    u32 dmas = 0;
398    DEB_EE("dev:%p, fh:%p\n", dev, fh);
399
400    if ((vv->video_status & STATUS_CAPTURE) != STATUS_CAPTURE) {
401        DEB_S("not capturing\n");
402        return 0;
403    }
404
405    if (vv->video_fh != fh) {
406        DEB_S("capturing, but in another open\n");
407        return -EBUSY;
408    }
409
410    fmt = saa7146_format_by_fourcc(dev, vv->video_fmt.pixelformat);
411    /* we need to have a valid format set here */
412    BUG_ON(NULL == fmt);
413
414    if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
415        resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
416        dmas = MASK_22 | MASK_21 | MASK_20;
417    } else {
418        resource = RESOURCE_DMA1_HPS;
419        dmas = MASK_22;
420    }
421    spin_lock_irqsave(&dev->slock,flags);
422
423    /* disable rps0 */
424    saa7146_write(dev, MC1, MASK_28);
425
426    /* disable rps0 irqs */
427    SAA7146_IER_DISABLE(dev, MASK_27);
428
429    /* shut down all used video dma transfers */
430    saa7146_write(dev, MC1, dmas);
431
432    spin_unlock_irqrestore(&dev->slock, flags);
433
434    vv->video_fh = NULL;
435    vv->video_status = 0;
436
437    saa7146_res_free(fh, resource);
438
439    if (vv->ov_suspend != NULL) {
440        saa7146_start_preview(vv->ov_suspend);
441        vv->ov_suspend = NULL;
442    }
443
444    return 0;
445}
446
447static int vidioc_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
448{
449    struct video_device *vdev = video_devdata(file);
450    struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
451
452    strcpy((char *)cap->driver, "saa7146 v4l2");
453    strlcpy((char *)cap->card, dev->ext->name, sizeof(cap->card));
454    sprintf((char *)cap->bus_info, "PCI:%s", pci_name(dev->pci));
455    cap->device_caps =
456        V4L2_CAP_VIDEO_CAPTURE |
457        V4L2_CAP_VIDEO_OVERLAY |
458        V4L2_CAP_READWRITE |
459        V4L2_CAP_STREAMING;
460    cap->device_caps |= dev->ext_vv_data->capabilities;
461    cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
462    if (vdev->vfl_type == VFL_TYPE_GRABBER)
463        cap->device_caps &=
464            ~(V4L2_CAP_VBI_CAPTURE | V4L2_CAP_SLICED_VBI_OUTPUT);
465    else
466        cap->device_caps &=
467            ~(V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OVERLAY | V4L2_CAP_AUDIO);
468    return 0;
469}
470
471static int vidioc_g_fbuf(struct file *file, void *fh, struct v4l2_framebuffer *fb)
472{
473    struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
474    struct saa7146_vv *vv = dev->vv_data;
475
476    *fb = vv->ov_fb;
477    fb->capability = V4L2_FBUF_CAP_LIST_CLIPPING;
478    fb->flags = V4L2_FBUF_FLAG_PRIMARY;
479    return 0;
480}
481
482static int vidioc_s_fbuf(struct file *file, void *fh, struct v4l2_framebuffer *fb)
483{
484    struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
485    struct saa7146_vv *vv = dev->vv_data;
486    struct saa7146_format *fmt;
487
488    DEB_EE("VIDIOC_S_FBUF\n");
489
490    if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
491        return -EPERM;
492
493    /* check args */
494    fmt = saa7146_format_by_fourcc(dev, fb->fmt.pixelformat);
495    if (NULL == fmt)
496        return -EINVAL;
497
498    /* planar formats are not allowed for overlay video, clipping and video dma would clash */
499    if (fmt->flags & FORMAT_IS_PLANAR)
500        DEB_S("planar pixelformat '%4.4s' not allowed for overlay\n",
501              (char *)&fmt->pixelformat);
502
503    /* check if overlay is running */
504    if (IS_OVERLAY_ACTIVE(fh) != 0) {
505        if (vv->video_fh != fh) {
506            DEB_D("refusing to change framebuffer informations while overlay is active in another open\n");
507            return -EBUSY;
508        }
509    }
510
511    /* ok, accept it */
512    vv->ov_fb = *fb;
513    vv->ov_fmt = fmt;
514
515    if (vv->ov_fb.fmt.bytesperline < vv->ov_fb.fmt.width) {
516        vv->ov_fb.fmt.bytesperline = vv->ov_fb.fmt.width * fmt->depth / 8;
517        DEB_D("setting bytesperline to %d\n", vv->ov_fb.fmt.bytesperline);
518    }
519    return 0;
520}
521
522static int vidioc_enum_fmt_vid_cap(struct file *file, void *fh, struct v4l2_fmtdesc *f)
523{
524    if (f->index >= NUM_FORMATS)
525        return -EINVAL;
526    strlcpy((char *)f->description, formats[f->index].name,
527            sizeof(f->description));
528    f->pixelformat = formats[f->index].pixelformat;
529    return 0;
530}
531
532int saa7146_s_ctrl(struct v4l2_ctrl *ctrl)
533{
534    struct saa7146_dev *dev = container_of(ctrl->handler,
535                struct saa7146_dev, ctrl_handler);
536    struct saa7146_vv *vv = dev->vv_data;
537    u32 val;
538
539    switch (ctrl->id) {
540    case V4L2_CID_BRIGHTNESS:
541        val = saa7146_read(dev, BCS_CTRL);
542        val &= 0x00ffffff;
543        val |= (ctrl->val << 24);
544        saa7146_write(dev, BCS_CTRL, val);
545        saa7146_write(dev, MC2, MASK_22 | MASK_06);
546        break;
547
548    case V4L2_CID_CONTRAST:
549        val = saa7146_read(dev, BCS_CTRL);
550        val &= 0xff00ffff;
551        val |= (ctrl->val << 16);
552        saa7146_write(dev, BCS_CTRL, val);
553        saa7146_write(dev, MC2, MASK_22 | MASK_06);
554        break;
555
556    case V4L2_CID_SATURATION:
557        val = saa7146_read(dev, BCS_CTRL);
558        val &= 0xffffff00;
559        val |= (ctrl->val << 0);
560        saa7146_write(dev, BCS_CTRL, val);
561        saa7146_write(dev, MC2, MASK_22 | MASK_06);
562        break;
563
564    case V4L2_CID_HFLIP:
565        /* fixme: we can support changing VFLIP and HFLIP here... */
566        if ((vv->video_status & STATUS_CAPTURE))
567            return -EBUSY;
568        vv->hflip = ctrl->val;
569        break;
570
571    case V4L2_CID_VFLIP:
572        if ((vv->video_status & STATUS_CAPTURE))
573            return -EBUSY;
574        vv->vflip = ctrl->val;
575        break;
576
577    default:
578        return -EINVAL;
579    }
580
581    if ((vv->video_status & STATUS_OVERLAY) != 0) { /* CHECK: && (vv->video_fh == fh)) */
582        struct saa7146_fh *fh = vv->video_fh;
583
584        saa7146_stop_preview(fh);
585        saa7146_start_preview(fh);
586    }
587    return 0;
588}
589
590static int vidioc_g_parm(struct file *file, void *fh,
591        struct v4l2_streamparm *parm)
592{
593    struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
594    struct saa7146_vv *vv = dev->vv_data;
595
596    if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
597        return -EINVAL;
598    parm->parm.capture.readbuffers = 1;
599    v4l2_video_std_frame_period(vv->standard->id,
600                    &parm->parm.capture.timeperframe);
601    return 0;
602}
603
604static int vidioc_g_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f)
605{
606    struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
607    struct saa7146_vv *vv = dev->vv_data;
608
609    f->fmt.pix = vv->video_fmt;
610    return 0;
611}
612
613static int vidioc_g_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f)
614{
615    struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
616    struct saa7146_vv *vv = dev->vv_data;
617
618    f->fmt.win = vv->ov.win;
619    return 0;
620}
621
622static int vidioc_g_fmt_vbi_cap(struct file *file, void *fh, struct v4l2_format *f)
623{
624    struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
625    struct saa7146_vv *vv = dev->vv_data;
626
627    f->fmt.vbi = vv->vbi_fmt;
628    return 0;
629}
630
631static int vidioc_try_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f)
632{
633    struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
634    struct saa7146_vv *vv = dev->vv_data;
635    struct saa7146_format *fmt;
636    enum v4l2_field field;
637    int maxw, maxh;
638    int calc_bpl;
639
640    DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: dev:%p, fh:%p\n", dev, fh);
641
642    fmt = saa7146_format_by_fourcc(dev, f->fmt.pix.pixelformat);
643    if (NULL == fmt)
644        return -EINVAL;
645
646    field = f->fmt.pix.field;
647    maxw = vv->standard->h_max_out;
648    maxh = vv->standard->v_max_out;
649
650    if (V4L2_FIELD_ANY == field) {
651        field = (f->fmt.pix.height > maxh / 2)
652            ? V4L2_FIELD_INTERLACED
653            : V4L2_FIELD_BOTTOM;
654    }
655    switch (field) {
656    case V4L2_FIELD_ALTERNATE:
657        vv->last_field = V4L2_FIELD_TOP;
658        maxh = maxh / 2;
659        break;
660    case V4L2_FIELD_TOP:
661    case V4L2_FIELD_BOTTOM:
662        vv->last_field = V4L2_FIELD_INTERLACED;
663        maxh = maxh / 2;
664        break;
665    case V4L2_FIELD_INTERLACED:
666        vv->last_field = V4L2_FIELD_INTERLACED;
667        break;
668    default:
669        DEB_D("no known field mode '%d'\n", field);
670        return -EINVAL;
671    }
672
673    f->fmt.pix.field = field;
674    f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
675    if (f->fmt.pix.width > maxw)
676        f->fmt.pix.width = maxw;
677    if (f->fmt.pix.height > maxh)
678        f->fmt.pix.height = maxh;
679
680    calc_bpl = (f->fmt.pix.width * fmt->depth) / 8;
681
682    if (f->fmt.pix.bytesperline < calc_bpl)
683        f->fmt.pix.bytesperline = calc_bpl;
684
685    if (f->fmt.pix.bytesperline > (2 * PAGE_SIZE * fmt->depth) / 8) /* arbitrary constraint */
686        f->fmt.pix.bytesperline = calc_bpl;
687
688    f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * f->fmt.pix.height;
689    DEB_D("w:%d, h:%d, bytesperline:%d, sizeimage:%d\n",
690          f->fmt.pix.width, f->fmt.pix.height,
691          f->fmt.pix.bytesperline, f->fmt.pix.sizeimage);
692
693    return 0;
694}
695
696
697static int vidioc_try_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f)
698{
699    struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
700    struct saa7146_vv *vv = dev->vv_data;
701    struct v4l2_window *win = &f->fmt.win;
702    enum v4l2_field field;
703    int maxw, maxh;
704
705    DEB_EE("dev:%p\n", dev);
706
707    if (NULL == vv->ov_fb.base) {
708        DEB_D("no fb base set\n");
709        return -EINVAL;
710    }
711    if (NULL == vv->ov_fmt) {
712        DEB_D("no fb fmt set\n");
713        return -EINVAL;
714    }
715    if (win->w.width < 48 || win->w.height < 32) {
716        DEB_D("min width/height. (%d,%d)\n",
717              win->w.width, win->w.height);
718        return -EINVAL;
719    }
720    if (win->clipcount > 16) {
721        DEB_D("clipcount too big\n");
722        return -EINVAL;
723    }
724
725    field = win->field;
726    maxw = vv->standard->h_max_out;
727    maxh = vv->standard->v_max_out;
728
729    if (V4L2_FIELD_ANY == field) {
730        field = (win->w.height > maxh / 2)
731            ? V4L2_FIELD_INTERLACED
732            : V4L2_FIELD_TOP;
733        }
734    switch (field) {
735    case V4L2_FIELD_TOP:
736    case V4L2_FIELD_BOTTOM:
737    case V4L2_FIELD_ALTERNATE:
738        maxh = maxh / 2;
739        break;
740    case V4L2_FIELD_INTERLACED:
741        break;
742    default:
743        DEB_D("no known field mode '%d'\n", field);
744        return -EINVAL;
745    }
746
747    win->field = field;
748    if (win->w.width > maxw)
749        win->w.width = maxw;
750    if (win->w.height > maxh)
751        win->w.height = maxh;
752
753    return 0;
754}
755
756static int vidioc_s_fmt_vid_cap(struct file *file, void *__fh, struct v4l2_format *f)
757{
758    struct saa7146_fh *fh = __fh;
759    struct saa7146_dev *dev = fh->dev;
760    struct saa7146_vv *vv = dev->vv_data;
761    int err;
762
763    DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: dev:%p, fh:%p\n", dev, fh);
764    if (IS_CAPTURE_ACTIVE(fh) != 0) {
765        DEB_EE("streaming capture is active\n");
766        return -EBUSY;
767    }
768    err = vidioc_try_fmt_vid_cap(file, fh, f);
769    if (0 != err)
770        return err;
771    vv->video_fmt = f->fmt.pix;
772    DEB_EE("set to pixelformat '%4.4s'\n",
773           (char *)&vv->video_fmt.pixelformat);
774    return 0;
775}
776
777static int vidioc_s_fmt_vid_overlay(struct file *file, void *__fh, struct v4l2_format *f)
778{
779    struct saa7146_fh *fh = __fh;
780    struct saa7146_dev *dev = fh->dev;
781    struct saa7146_vv *vv = dev->vv_data;
782    int err;
783
784    DEB_EE("V4L2_BUF_TYPE_VIDEO_OVERLAY: dev:%p, fh:%p\n", dev, fh);
785    err = vidioc_try_fmt_vid_overlay(file, fh, f);
786    if (0 != err)
787        return err;
788    vv->ov.win = f->fmt.win;
789    vv->ov.nclips = f->fmt.win.clipcount;
790    if (vv->ov.nclips > 16)
791        vv->ov.nclips = 16;
792    if (copy_from_user(vv->ov.clips, f->fmt.win.clips,
793                sizeof(struct v4l2_clip) * vv->ov.nclips)) {
794        return -EFAULT;
795    }
796
797    /* vv->ov.fh is used to indicate that we have valid overlay informations, too */
798    vv->ov.fh = fh;
799
800    /* check if our current overlay is active */
801    if (IS_OVERLAY_ACTIVE(fh) != 0) {
802        saa7146_stop_preview(fh);
803        saa7146_start_preview(fh);
804    }
805    return 0;
806}
807
808static int vidioc_g_std(struct file *file, void *fh, v4l2_std_id *norm)
809{
810    struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
811    struct saa7146_vv *vv = dev->vv_data;
812
813    *norm = vv->standard->id;
814    return 0;
815}
816
817    /* the saa7146 supfhrts (used in conjunction with the saa7111a for example)
818       PAL / NTSC / SECAM. if your hardware does not (or does more)
819       -- override this function in your extension */
820/*
821    case VIDIOC_ENUMSTD:
822    {
823        struct v4l2_standard *e = arg;
824        if (e->index < 0 )
825            return -EINVAL;
826        if( e->index < dev->ext_vv_data->num_stds ) {
827            DEB_EE("VIDIOC_ENUMSTD: index:%d\n", e->index);
828            v4l2_video_std_construct(e, dev->ext_vv_data->stds[e->index].id, dev->ext_vv_data->stds[e->index].name);
829            return 0;
830        }
831        return -EINVAL;
832    }
833    */
834
835static int vidioc_s_std(struct file *file, void *fh, v4l2_std_id *id)
836{
837    struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
838    struct saa7146_vv *vv = dev->vv_data;
839    int found = 0;
840    int err, i;
841
842    DEB_EE("VIDIOC_S_STD\n");
843
844    if ((vv->video_status & STATUS_CAPTURE) == STATUS_CAPTURE) {
845        DEB_D("cannot change video standard while streaming capture is active\n");
846        return -EBUSY;
847    }
848
849    if ((vv->video_status & STATUS_OVERLAY) != 0) {
850        vv->ov_suspend = vv->video_fh;
851        err = saa7146_stop_preview(vv->video_fh); /* side effect: video_status is now 0, video_fh is NULL */
852        if (0 != err) {
853            DEB_D("suspending video failed. aborting\n");
854            return err;
855        }
856    }
857
858    for (i = 0; i < dev->ext_vv_data->num_stds; i++)
859        if (*id & dev->ext_vv_data->stds[i].id)
860            break;
861    if (i != dev->ext_vv_data->num_stds) {
862        vv->standard = &dev->ext_vv_data->stds[i];
863        if (NULL != dev->ext_vv_data->std_callback)
864            dev->ext_vv_data->std_callback(dev, vv->standard);
865        found = 1;
866    }
867
868    if (vv->ov_suspend != NULL) {
869        saa7146_start_preview(vv->ov_suspend);
870        vv->ov_suspend = NULL;
871    }
872
873    if (!found) {
874        DEB_EE("VIDIOC_S_STD: standard not found\n");
875        return -EINVAL;
876    }
877
878    DEB_EE("VIDIOC_S_STD: set to standard to '%s'\n", vv->standard->name);
879    return 0;
880}
881
882static int vidioc_overlay(struct file *file, void *fh, unsigned int on)
883{
884    int err;
885
886    DEB_D("VIDIOC_OVERLAY on:%d\n", on);
887    if (on)
888        err = saa7146_start_preview(fh);
889    else
890        err = saa7146_stop_preview(fh);
891    return err;
892}
893
894static int vidioc_reqbufs(struct file *file, void *__fh, struct v4l2_requestbuffers *b)
895{
896    struct saa7146_fh *fh = __fh;
897
898    if (b->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
899        return videobuf_reqbufs(&fh->video_q, b);
900    if (b->type == V4L2_BUF_TYPE_VBI_CAPTURE)
901        return videobuf_reqbufs(&fh->vbi_q, b);
902    return -EINVAL;
903}
904
905static int vidioc_querybuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
906{
907    struct saa7146_fh *fh = __fh;
908
909    if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
910        return videobuf_querybuf(&fh->video_q, buf);
911    if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
912        return videobuf_querybuf(&fh->vbi_q, buf);
913    return -EINVAL;
914}
915
916static int vidioc_qbuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
917{
918    struct saa7146_fh *fh = __fh;
919
920    if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
921        return videobuf_qbuf(&fh->video_q, buf);
922    if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
923        return videobuf_qbuf(&fh->vbi_q, buf);
924    return -EINVAL;
925}
926
927static int vidioc_dqbuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
928{
929    struct saa7146_fh *fh = __fh;
930
931    if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
932        return videobuf_dqbuf(&fh->video_q, buf, file->f_flags & O_NONBLOCK);
933    if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
934        return videobuf_dqbuf(&fh->vbi_q, buf, file->f_flags & O_NONBLOCK);
935    return -EINVAL;
936}
937
938static int vidioc_streamon(struct file *file, void *__fh, enum v4l2_buf_type type)
939{
940    struct saa7146_fh *fh = __fh;
941    int err;
942
943    DEB_D("VIDIOC_STREAMON, type:%d\n", type);
944
945    err = video_begin(fh);
946    if (err)
947        return err;
948    if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
949        return videobuf_streamon(&fh->video_q);
950    if (type == V4L2_BUF_TYPE_VBI_CAPTURE)
951        return videobuf_streamon(&fh->vbi_q);
952    return -EINVAL;
953}
954
955static int vidioc_streamoff(struct file *file, void *__fh, enum v4l2_buf_type type)
956{
957    struct saa7146_fh *fh = __fh;
958    struct saa7146_dev *dev = fh->dev;
959    struct saa7146_vv *vv = dev->vv_data;
960    int err;
961
962    DEB_D("VIDIOC_STREAMOFF, type:%d\n", type);
963
964    /* ugly: we need to copy some checks from video_end(),
965       because videobuf_streamoff() relies on the capture running.
966       check and fix this */
967    if ((vv->video_status & STATUS_CAPTURE) != STATUS_CAPTURE) {
968        DEB_S("not capturing\n");
969        return 0;
970    }
971
972    if (vv->video_fh != fh) {
973        DEB_S("capturing, but in another open\n");
974        return -EBUSY;
975    }
976
977    err = -EINVAL;
978    if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
979        err = videobuf_streamoff(&fh->video_q);
980    else if (type == V4L2_BUF_TYPE_VBI_CAPTURE)
981        err = videobuf_streamoff(&fh->vbi_q);
982    if (0 != err) {
983        DEB_D("warning: videobuf_streamoff() failed\n");
984        video_end(fh, file);
985    } else {
986        err = video_end(fh, file);
987    }
988    return err;
989}
990
991static int vidioc_g_chip_ident(struct file *file, void *__fh,
992        struct v4l2_dbg_chip_ident *chip)
993{
994    struct saa7146_fh *fh = __fh;
995    struct saa7146_dev *dev = fh->dev;
996
997    chip->ident = V4L2_IDENT_NONE;
998    chip->revision = 0;
999    if (chip->match.type == V4L2_CHIP_MATCH_HOST) {
1000        if (v4l2_chip_match_host(&chip->match))
1001            chip->ident = V4L2_IDENT_SAA7146;
1002        return 0;
1003    }
1004    if (chip->match.type != V4L2_CHIP_MATCH_I2C_DRIVER &&
1005        chip->match.type != V4L2_CHIP_MATCH_I2C_ADDR)
1006        return -EINVAL;
1007    return v4l2_device_call_until_err(&dev->v4l2_dev, 0,
1008            core, g_chip_ident, chip);
1009}
1010
1011const struct v4l2_ioctl_ops saa7146_video_ioctl_ops = {
1012    .vidioc_querycap = vidioc_querycap,
1013    .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1014    .vidioc_enum_fmt_vid_overlay = vidioc_enum_fmt_vid_cap,
1015    .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1016    .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1017    .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1018    .vidioc_g_fmt_vid_overlay = vidioc_g_fmt_vid_overlay,
1019    .vidioc_try_fmt_vid_overlay = vidioc_try_fmt_vid_overlay,
1020    .vidioc_s_fmt_vid_overlay = vidioc_s_fmt_vid_overlay,
1021    .vidioc_g_chip_ident = vidioc_g_chip_ident,
1022
1023    .vidioc_overlay = vidioc_overlay,
1024    .vidioc_g_fbuf = vidioc_g_fbuf,
1025    .vidioc_s_fbuf = vidioc_s_fbuf,
1026    .vidioc_reqbufs = vidioc_reqbufs,
1027    .vidioc_querybuf = vidioc_querybuf,
1028    .vidioc_qbuf = vidioc_qbuf,
1029    .vidioc_dqbuf = vidioc_dqbuf,
1030    .vidioc_g_std = vidioc_g_std,
1031    .vidioc_s_std = vidioc_s_std,
1032    .vidioc_streamon = vidioc_streamon,
1033    .vidioc_streamoff = vidioc_streamoff,
1034    .vidioc_g_parm = vidioc_g_parm,
1035    .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
1036    .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1037};
1038
1039const struct v4l2_ioctl_ops saa7146_vbi_ioctl_ops = {
1040    .vidioc_querycap = vidioc_querycap,
1041    .vidioc_g_fmt_vbi_cap = vidioc_g_fmt_vbi_cap,
1042    .vidioc_g_chip_ident = vidioc_g_chip_ident,
1043
1044    .vidioc_reqbufs = vidioc_reqbufs,
1045    .vidioc_querybuf = vidioc_querybuf,
1046    .vidioc_qbuf = vidioc_qbuf,
1047    .vidioc_dqbuf = vidioc_dqbuf,
1048    .vidioc_g_std = vidioc_g_std,
1049    .vidioc_s_std = vidioc_s_std,
1050    .vidioc_streamon = vidioc_streamon,
1051    .vidioc_streamoff = vidioc_streamoff,
1052    .vidioc_g_parm = vidioc_g_parm,
1053    .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
1054    .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1055};
1056
1057/*********************************************************************************/
1058/* buffer handling functions */
1059
1060static int buffer_activate (struct saa7146_dev *dev,
1061             struct saa7146_buf *buf,
1062             struct saa7146_buf *next)
1063{
1064    struct saa7146_vv *vv = dev->vv_data;
1065
1066    buf->vb.state = VIDEOBUF_ACTIVE;
1067    saa7146_set_capture(dev,buf,next);
1068
1069    mod_timer(&vv->video_dmaq.timeout, jiffies+BUFFER_TIMEOUT);
1070    return 0;
1071}
1072
1073static void release_all_pagetables(struct saa7146_dev *dev, struct saa7146_buf *buf)
1074{
1075    saa7146_pgtable_free(dev->pci, &buf->pt[0]);
1076    saa7146_pgtable_free(dev->pci, &buf->pt[1]);
1077    saa7146_pgtable_free(dev->pci, &buf->pt[2]);
1078}
1079
1080static int buffer_prepare(struct videobuf_queue *q,
1081              struct videobuf_buffer *vb, enum v4l2_field field)
1082{
1083    struct file *file = q->priv_data;
1084    struct saa7146_fh *fh = file->private_data;
1085    struct saa7146_dev *dev = fh->dev;
1086    struct saa7146_vv *vv = dev->vv_data;
1087    struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1088    int size,err = 0;
1089
1090    DEB_CAP("vbuf:%p\n", vb);
1091
1092    /* sanity checks */
1093    if (vv->video_fmt.width < 48 ||
1094        vv->video_fmt.height < 32 ||
1095        vv->video_fmt.width > vv->standard->h_max_out ||
1096        vv->video_fmt.height > vv->standard->v_max_out) {
1097        DEB_D("w (%d) / h (%d) out of bounds\n",
1098              vv->video_fmt.width, vv->video_fmt.height);
1099        return -EINVAL;
1100    }
1101
1102    size = vv->video_fmt.sizeimage;
1103    if (0 != buf->vb.baddr && buf->vb.bsize < size) {
1104        DEB_D("size mismatch\n");
1105        return -EINVAL;
1106    }
1107
1108    DEB_CAP("buffer_prepare [size=%dx%d,bytes=%d,fields=%s]\n",
1109        vv->video_fmt.width, vv->video_fmt.height,
1110        size, v4l2_field_names[vv->video_fmt.field]);
1111    if (buf->vb.width != vv->video_fmt.width ||
1112        buf->vb.bytesperline != vv->video_fmt.bytesperline ||
1113        buf->vb.height != vv->video_fmt.height ||
1114        buf->vb.size != size ||
1115        buf->vb.field != field ||
1116        buf->vb.field != vv->video_fmt.field ||
1117        buf->fmt != &vv->video_fmt) {
1118        saa7146_dma_free(dev,q,buf);
1119    }
1120
1121    if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
1122        struct saa7146_format *sfmt;
1123
1124        buf->vb.bytesperline = vv->video_fmt.bytesperline;
1125        buf->vb.width = vv->video_fmt.width;
1126        buf->vb.height = vv->video_fmt.height;
1127        buf->vb.size = size;
1128        buf->vb.field = field;
1129        buf->fmt = &vv->video_fmt;
1130        buf->vb.field = vv->video_fmt.field;
1131
1132        sfmt = saa7146_format_by_fourcc(dev,buf->fmt->pixelformat);
1133
1134        release_all_pagetables(dev, buf);
1135        if( 0 != IS_PLANAR(sfmt->trans)) {
1136            saa7146_pgtable_alloc(dev->pci, &buf->pt[0]);
1137            saa7146_pgtable_alloc(dev->pci, &buf->pt[1]);
1138            saa7146_pgtable_alloc(dev->pci, &buf->pt[2]);
1139        } else {
1140            saa7146_pgtable_alloc(dev->pci, &buf->pt[0]);
1141        }
1142
1143        err = videobuf_iolock(q,&buf->vb, &vv->ov_fb);
1144        if (err)
1145            goto oops;
1146        err = saa7146_pgtable_build(dev,buf);
1147        if (err)
1148            goto oops;
1149    }
1150    buf->vb.state = VIDEOBUF_PREPARED;
1151    buf->activate = buffer_activate;
1152
1153    return 0;
1154
1155 oops:
1156    DEB_D("error out\n");
1157    saa7146_dma_free(dev,q,buf);
1158
1159    return err;
1160}
1161
1162static int buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
1163{
1164    struct file *file = q->priv_data;
1165    struct saa7146_fh *fh = file->private_data;
1166    struct saa7146_vv *vv = fh->dev->vv_data;
1167
1168    if (0 == *count || *count > MAX_SAA7146_CAPTURE_BUFFERS)
1169        *count = MAX_SAA7146_CAPTURE_BUFFERS;
1170
1171    *size = vv->video_fmt.sizeimage;
1172
1173    /* check if we exceed the "max_memory" parameter */
1174    if( (*count * *size) > (max_memory*1048576) ) {
1175        *count = (max_memory*1048576) / *size;
1176    }
1177
1178    DEB_CAP("%d buffers, %d bytes each\n", *count, *size);
1179
1180    return 0;
1181}
1182
1183static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
1184{
1185    struct file *file = q->priv_data;
1186    struct saa7146_fh *fh = file->private_data;
1187    struct saa7146_dev *dev = fh->dev;
1188    struct saa7146_vv *vv = dev->vv_data;
1189    struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1190
1191    DEB_CAP("vbuf:%p\n", vb);
1192    saa7146_buffer_queue(fh->dev, &vv->video_dmaq, buf);
1193}
1194
1195static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
1196{
1197    struct file *file = q->priv_data;
1198    struct saa7146_fh *fh = file->private_data;
1199    struct saa7146_dev *dev = fh->dev;
1200    struct saa7146_buf *buf = (struct saa7146_buf *)vb;
1201
1202    DEB_CAP("vbuf:%p\n", vb);
1203
1204    saa7146_dma_free(dev,q,buf);
1205
1206    release_all_pagetables(dev, buf);
1207}
1208
1209static struct videobuf_queue_ops video_qops = {
1210    .buf_setup = buffer_setup,
1211    .buf_prepare = buffer_prepare,
1212    .buf_queue = buffer_queue,
1213    .buf_release = buffer_release,
1214};
1215
1216/********************************************************************************/
1217/* file operations */
1218
1219static void video_init(struct saa7146_dev *dev, struct saa7146_vv *vv)
1220{
1221    INIT_LIST_HEAD(&vv->video_dmaq.queue);
1222
1223    init_timer(&vv->video_dmaq.timeout);
1224    vv->video_dmaq.timeout.function = saa7146_buffer_timeout;
1225    vv->video_dmaq.timeout.data = (unsigned long)(&vv->video_dmaq);
1226    vv->video_dmaq.dev = dev;
1227
1228    /* set some default values */
1229    vv->standard = &dev->ext_vv_data->stds[0];
1230
1231    /* FIXME: what's this? */
1232    vv->current_hps_source = SAA7146_HPS_SOURCE_PORT_A;
1233    vv->current_hps_sync = SAA7146_HPS_SYNC_PORT_A;
1234}
1235
1236
1237static int video_open(struct saa7146_dev *dev, struct file *file)
1238{
1239    struct saa7146_fh *fh = file->private_data;
1240
1241    videobuf_queue_sg_init(&fh->video_q, &video_qops,
1242                &dev->pci->dev, &dev->slock,
1243                V4L2_BUF_TYPE_VIDEO_CAPTURE,
1244                V4L2_FIELD_INTERLACED,
1245                sizeof(struct saa7146_buf),
1246                file, &dev->v4l2_lock);
1247
1248    return 0;
1249}
1250
1251
1252static void video_close(struct saa7146_dev *dev, struct file *file)
1253{
1254    struct saa7146_fh *fh = file->private_data;
1255    struct saa7146_vv *vv = dev->vv_data;
1256    struct videobuf_queue *q = &fh->video_q;
1257
1258    if (IS_CAPTURE_ACTIVE(fh) != 0)
1259        video_end(fh, file);
1260    else if (IS_OVERLAY_ACTIVE(fh) != 0)
1261        saa7146_stop_preview(fh);
1262
1263    videobuf_stop(q);
1264    /* hmm, why is this function declared void? */
1265}
1266
1267
1268static void video_irq_done(struct saa7146_dev *dev, unsigned long st)
1269{
1270    struct saa7146_vv *vv = dev->vv_data;
1271    struct saa7146_dmaqueue *q = &vv->video_dmaq;
1272
1273    spin_lock(&dev->slock);
1274    DEB_CAP("called\n");
1275
1276    /* only finish the buffer if we have one... */
1277    if( NULL != q->curr ) {
1278        saa7146_buffer_finish(dev,q,VIDEOBUF_DONE);
1279    }
1280    saa7146_buffer_next(dev,q,0);
1281
1282    spin_unlock(&dev->slock);
1283}
1284
1285static ssize_t video_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
1286{
1287    struct saa7146_fh *fh = file->private_data;
1288    struct saa7146_dev *dev = fh->dev;
1289    struct saa7146_vv *vv = dev->vv_data;
1290    ssize_t ret = 0;
1291
1292    DEB_EE("called\n");
1293
1294    if ((vv->video_status & STATUS_CAPTURE) != 0) {
1295        /* fixme: should we allow read() captures while streaming capture? */
1296        if (vv->video_fh == fh) {
1297            DEB_S("already capturing\n");
1298            return -EBUSY;
1299        }
1300        DEB_S("already capturing in another open\n");
1301        return -EBUSY;
1302    }
1303
1304    ret = video_begin(fh);
1305    if( 0 != ret) {
1306        goto out;
1307    }
1308
1309    ret = videobuf_read_one(&fh->video_q , data, count, ppos,
1310                file->f_flags & O_NONBLOCK);
1311    if (ret != 0) {
1312        video_end(fh, file);
1313    } else {
1314        ret = video_end(fh, file);
1315    }
1316out:
1317    /* restart overlay if it was active before */
1318    if (vv->ov_suspend != NULL) {
1319        saa7146_start_preview(vv->ov_suspend);
1320        vv->ov_suspend = NULL;
1321    }
1322
1323    return ret;
1324}
1325
1326struct saa7146_use_ops saa7146_video_uops = {
1327    .init = video_init,
1328    .open = video_open,
1329    .release = video_close,
1330    .irq_done = video_irq_done,
1331    .read = video_read,
1332};
1333

Archive Download this file



interactive