Root/drivers/media/common/saa7146_fops.c

1#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
2
3#include <media/saa7146_vv.h>
4#include <linux/module.h>
5
6/****************************************************************************/
7/* resource management functions, shamelessly stolen from saa7134 driver */
8
9int saa7146_res_get(struct saa7146_fh *fh, unsigned int bit)
10{
11    struct saa7146_dev *dev = fh->dev;
12    struct saa7146_vv *vv = dev->vv_data;
13
14    if (fh->resources & bit) {
15        DEB_D("already allocated! want: 0x%02x, cur:0x%02x\n",
16              bit, vv->resources);
17        /* have it already allocated */
18        return 1;
19    }
20
21    /* is it free? */
22    if (vv->resources & bit) {
23        DEB_D("locked! vv->resources:0x%02x, we want:0x%02x\n",
24              vv->resources, bit);
25        /* no, someone else uses it */
26        return 0;
27    }
28    /* it's free, grab it */
29    fh->resources |= bit;
30    vv->resources |= bit;
31    DEB_D("res: get 0x%02x, cur:0x%02x\n", bit, vv->resources);
32    return 1;
33}
34
35void saa7146_res_free(struct saa7146_fh *fh, unsigned int bits)
36{
37    struct saa7146_dev *dev = fh->dev;
38    struct saa7146_vv *vv = dev->vv_data;
39
40    BUG_ON((fh->resources & bits) != bits);
41
42    fh->resources &= ~bits;
43    vv->resources &= ~bits;
44    DEB_D("res: put 0x%02x, cur:0x%02x\n", bits, vv->resources);
45}
46
47
48/********************************************************************************/
49/* common dma functions */
50
51void saa7146_dma_free(struct saa7146_dev *dev,struct videobuf_queue *q,
52                        struct saa7146_buf *buf)
53{
54    struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
55    DEB_EE("dev:%p, buf:%p\n", dev, buf);
56
57    BUG_ON(in_interrupt());
58
59    videobuf_waiton(q, &buf->vb, 0, 0);
60    videobuf_dma_unmap(q->dev, dma);
61    videobuf_dma_free(dma);
62    buf->vb.state = VIDEOBUF_NEEDS_INIT;
63}
64
65
66/********************************************************************************/
67/* common buffer functions */
68
69int saa7146_buffer_queue(struct saa7146_dev *dev,
70             struct saa7146_dmaqueue *q,
71             struct saa7146_buf *buf)
72{
73    assert_spin_locked(&dev->slock);
74    DEB_EE("dev:%p, dmaq:%p, buf:%p\n", dev, q, buf);
75
76    BUG_ON(!q);
77
78    if (NULL == q->curr) {
79        q->curr = buf;
80        DEB_D("immediately activating buffer %p\n", buf);
81        buf->activate(dev,buf,NULL);
82    } else {
83        list_add_tail(&buf->vb.queue,&q->queue);
84        buf->vb.state = VIDEOBUF_QUEUED;
85        DEB_D("adding buffer %p to queue. (active buffer present)\n",
86              buf);
87    }
88    return 0;
89}
90
91void saa7146_buffer_finish(struct saa7146_dev *dev,
92               struct saa7146_dmaqueue *q,
93               int state)
94{
95    assert_spin_locked(&dev->slock);
96    DEB_EE("dev:%p, dmaq:%p, state:%d\n", dev, q, state);
97    DEB_EE("q->curr:%p\n", q->curr);
98
99    BUG_ON(!q->curr);
100
101    /* finish current buffer */
102    if (NULL == q->curr) {
103        DEB_D("aiii. no current buffer\n");
104        return;
105    }
106
107    q->curr->vb.state = state;
108    do_gettimeofday(&q->curr->vb.ts);
109    wake_up(&q->curr->vb.done);
110
111    q->curr = NULL;
112}
113
114void saa7146_buffer_next(struct saa7146_dev *dev,
115             struct saa7146_dmaqueue *q, int vbi)
116{
117    struct saa7146_buf *buf,*next = NULL;
118
119    BUG_ON(!q);
120
121    DEB_INT("dev:%p, dmaq:%p, vbi:%d\n", dev, q, vbi);
122
123    assert_spin_locked(&dev->slock);
124    if (!list_empty(&q->queue)) {
125        /* activate next one from queue */
126        buf = list_entry(q->queue.next,struct saa7146_buf,vb.queue);
127        list_del(&buf->vb.queue);
128        if (!list_empty(&q->queue))
129            next = list_entry(q->queue.next,struct saa7146_buf, vb.queue);
130        q->curr = buf;
131        DEB_INT("next buffer: buf:%p, prev:%p, next:%p\n",
132            buf, q->queue.prev, q->queue.next);
133        buf->activate(dev,buf,next);
134    } else {
135        DEB_INT("no next buffer. stopping.\n");
136        if( 0 != vbi ) {
137            /* turn off video-dma3 */
138            saa7146_write(dev,MC1, MASK_20);
139        } else {
140            /* nothing to do -- just prevent next video-dma1 transfer
141               by lowering the protection address */
142
143            // fixme: fix this for vflip != 0
144
145            saa7146_write(dev, PROT_ADDR1, 0);
146            saa7146_write(dev, MC2, (MASK_02|MASK_18));
147
148            /* write the address of the rps-program */
149            saa7146_write(dev, RPS_ADDR0, dev->d_rps0.dma_handle);
150            /* turn on rps */
151            saa7146_write(dev, MC1, (MASK_12 | MASK_28));
152
153/*
154            printk("vdma%d.base_even: 0x%08x\n", 1,saa7146_read(dev,BASE_EVEN1));
155            printk("vdma%d.base_odd: 0x%08x\n", 1,saa7146_read(dev,BASE_ODD1));
156            printk("vdma%d.prot_addr: 0x%08x\n", 1,saa7146_read(dev,PROT_ADDR1));
157            printk("vdma%d.base_page: 0x%08x\n", 1,saa7146_read(dev,BASE_PAGE1));
158            printk("vdma%d.pitch: 0x%08x\n", 1,saa7146_read(dev,PITCH1));
159            printk("vdma%d.num_line_byte: 0x%08x\n", 1,saa7146_read(dev,NUM_LINE_BYTE1));
160*/
161        }
162        del_timer(&q->timeout);
163    }
164}
165
166void saa7146_buffer_timeout(unsigned long data)
167{
168    struct saa7146_dmaqueue *q = (struct saa7146_dmaqueue*)data;
169    struct saa7146_dev *dev = q->dev;
170    unsigned long flags;
171
172    DEB_EE("dev:%p, dmaq:%p\n", dev, q);
173
174    spin_lock_irqsave(&dev->slock,flags);
175    if (q->curr) {
176        DEB_D("timeout on %p\n", q->curr);
177        saa7146_buffer_finish(dev,q,VIDEOBUF_ERROR);
178    }
179
180    /* we don't restart the transfer here like other drivers do. when
181       a streaming capture is disabled, the timeout function will be
182       called for the current buffer. if we activate the next buffer now,
183       we mess up our capture logic. if a timeout occurs on another buffer,
184       then something is seriously broken before, so no need to buffer the
185       next capture IMHO... */
186/*
187    saa7146_buffer_next(dev,q);
188*/
189    spin_unlock_irqrestore(&dev->slock,flags);
190}
191
192/********************************************************************************/
193/* file operations */
194
195static int fops_open(struct file *file)
196{
197    struct video_device *vdev = video_devdata(file);
198    struct saa7146_dev *dev = video_drvdata(file);
199    struct saa7146_fh *fh = NULL;
200    int result = 0;
201
202    DEB_EE("file:%p, dev:%s\n", file, video_device_node_name(vdev));
203
204    if (mutex_lock_interruptible(&saa7146_devices_lock))
205        return -ERESTARTSYS;
206
207    DEB_D("using: %p\n", dev);
208
209    /* check if an extension is registered */
210    if( NULL == dev->ext ) {
211        DEB_S("no extension registered for this device\n");
212        result = -ENODEV;
213        goto out;
214    }
215
216    /* allocate per open data */
217    fh = kzalloc(sizeof(*fh),GFP_KERNEL);
218    if (NULL == fh) {
219        DEB_S("cannot allocate memory for per open data\n");
220        result = -ENOMEM;
221        goto out;
222    }
223
224    v4l2_fh_init(&fh->fh, vdev);
225
226    file->private_data = &fh->fh;
227    fh->dev = dev;
228
229    if (vdev->vfl_type == VFL_TYPE_VBI) {
230        DEB_S("initializing vbi...\n");
231        if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
232            result = saa7146_vbi_uops.open(dev,file);
233        if (dev->ext_vv_data->vbi_fops.open)
234            dev->ext_vv_data->vbi_fops.open(file);
235    } else {
236        DEB_S("initializing video...\n");
237        result = saa7146_video_uops.open(dev,file);
238    }
239
240    if (0 != result) {
241        goto out;
242    }
243
244    if( 0 == try_module_get(dev->ext->module)) {
245        result = -EINVAL;
246        goto out;
247    }
248
249    result = 0;
250    v4l2_fh_add(&fh->fh);
251out:
252    if (fh && result != 0) {
253        kfree(fh);
254        file->private_data = NULL;
255    }
256    mutex_unlock(&saa7146_devices_lock);
257    return result;
258}
259
260static int fops_release(struct file *file)
261{
262    struct video_device *vdev = video_devdata(file);
263    struct saa7146_fh *fh = file->private_data;
264    struct saa7146_dev *dev = fh->dev;
265
266    DEB_EE("file:%p\n", file);
267
268    if (mutex_lock_interruptible(&saa7146_devices_lock))
269        return -ERESTARTSYS;
270
271    if (vdev->vfl_type == VFL_TYPE_VBI) {
272        if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
273            saa7146_vbi_uops.release(dev,file);
274        if (dev->ext_vv_data->vbi_fops.release)
275            dev->ext_vv_data->vbi_fops.release(file);
276    } else {
277        saa7146_video_uops.release(dev,file);
278    }
279
280    v4l2_fh_del(&fh->fh);
281    v4l2_fh_exit(&fh->fh);
282    module_put(dev->ext->module);
283    file->private_data = NULL;
284    kfree(fh);
285
286    mutex_unlock(&saa7146_devices_lock);
287
288    return 0;
289}
290
291static int fops_mmap(struct file *file, struct vm_area_struct * vma)
292{
293    struct video_device *vdev = video_devdata(file);
294    struct saa7146_fh *fh = file->private_data;
295    struct videobuf_queue *q;
296
297    switch (vdev->vfl_type) {
298    case VFL_TYPE_GRABBER: {
299        DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, vma:%p\n",
300               file, vma);
301        q = &fh->video_q;
302        break;
303        }
304    case VFL_TYPE_VBI: {
305        DEB_EE("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, vma:%p\n",
306               file, vma);
307        if (fh->dev->ext_vv_data->capabilities & V4L2_CAP_SLICED_VBI_OUTPUT)
308            return -ENODEV;
309        q = &fh->vbi_q;
310        break;
311        }
312    default:
313        BUG();
314        return 0;
315    }
316
317    return videobuf_mmap_mapper(q,vma);
318}
319
320static unsigned int fops_poll(struct file *file, struct poll_table_struct *wait)
321{
322    struct video_device *vdev = video_devdata(file);
323    struct saa7146_fh *fh = file->private_data;
324    struct videobuf_buffer *buf = NULL;
325    struct videobuf_queue *q;
326    unsigned int res = v4l2_ctrl_poll(file, wait);
327
328    DEB_EE("file:%p, poll:%p\n", file, wait);
329
330    if (vdev->vfl_type == VFL_TYPE_VBI) {
331        if (fh->dev->ext_vv_data->capabilities & V4L2_CAP_SLICED_VBI_OUTPUT)
332            return res | POLLOUT | POLLWRNORM;
333        if( 0 == fh->vbi_q.streaming )
334            return res | videobuf_poll_stream(file, &fh->vbi_q, wait);
335        q = &fh->vbi_q;
336    } else {
337        DEB_D("using video queue\n");
338        q = &fh->video_q;
339    }
340
341    if (!list_empty(&q->stream))
342        buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
343
344    if (!buf) {
345        DEB_D("buf == NULL!\n");
346        return res | POLLERR;
347    }
348
349    poll_wait(file, &buf->done, wait);
350    if (buf->state == VIDEOBUF_DONE || buf->state == VIDEOBUF_ERROR) {
351        DEB_D("poll succeeded!\n");
352        return res | POLLIN | POLLRDNORM;
353    }
354
355    DEB_D("nothing to poll for, buf->state:%d\n", buf->state);
356    return res;
357}
358
359static ssize_t fops_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
360{
361    struct video_device *vdev = video_devdata(file);
362    struct saa7146_fh *fh = file->private_data;
363
364    switch (vdev->vfl_type) {
365    case VFL_TYPE_GRABBER:
366/*
367        DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, data:%p, count:%lun",
368               file, data, (unsigned long)count);
369*/
370        return saa7146_video_uops.read(file,data,count,ppos);
371    case VFL_TYPE_VBI:
372/*
373        DEB_EE("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, data:%p, count:%lu\n",
374               file, data, (unsigned long)count);
375*/
376        if (fh->dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
377            return saa7146_vbi_uops.read(file,data,count,ppos);
378        return -EINVAL;
379    default:
380        BUG();
381        return 0;
382    }
383}
384
385static ssize_t fops_write(struct file *file, const char __user *data, size_t count, loff_t *ppos)
386{
387    struct video_device *vdev = video_devdata(file);
388    struct saa7146_fh *fh = file->private_data;
389
390    switch (vdev->vfl_type) {
391    case VFL_TYPE_GRABBER:
392        return -EINVAL;
393    case VFL_TYPE_VBI:
394        if (fh->dev->ext_vv_data->vbi_fops.write)
395            return fh->dev->ext_vv_data->vbi_fops.write(file, data, count, ppos);
396        else
397            return -EINVAL;
398    default:
399        BUG();
400        return -EINVAL;
401    }
402}
403
404static const struct v4l2_file_operations video_fops =
405{
406    .owner = THIS_MODULE,
407    .open = fops_open,
408    .release = fops_release,
409    .read = fops_read,
410    .write = fops_write,
411    .poll = fops_poll,
412    .mmap = fops_mmap,
413    .unlocked_ioctl = video_ioctl2,
414};
415
416static void vv_callback(struct saa7146_dev *dev, unsigned long status)
417{
418    u32 isr = status;
419
420    DEB_INT("dev:%p, isr:0x%08x\n", dev, (u32)status);
421
422    if (0 != (isr & (MASK_27))) {
423        DEB_INT("irq: RPS0 (0x%08x)\n", isr);
424        saa7146_video_uops.irq_done(dev,isr);
425    }
426
427    if (0 != (isr & (MASK_28))) {
428        u32 mc2 = saa7146_read(dev, MC2);
429        if( 0 != (mc2 & MASK_15)) {
430            DEB_INT("irq: RPS1 vbi workaround (0x%08x)\n", isr);
431            wake_up(&dev->vv_data->vbi_wq);
432            saa7146_write(dev,MC2, MASK_31);
433            return;
434        }
435        DEB_INT("irq: RPS1 (0x%08x)\n", isr);
436        saa7146_vbi_uops.irq_done(dev,isr);
437    }
438}
439
440static const struct v4l2_ctrl_ops saa7146_ctrl_ops = {
441    .s_ctrl = saa7146_s_ctrl,
442};
443
444int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
445{
446    struct v4l2_ctrl_handler *hdl = &dev->ctrl_handler;
447    struct v4l2_pix_format *fmt;
448    struct v4l2_vbi_format *vbi;
449    struct saa7146_vv *vv;
450    int err;
451
452    err = v4l2_device_register(&dev->pci->dev, &dev->v4l2_dev);
453    if (err)
454        return err;
455
456    v4l2_ctrl_handler_init(hdl, 6);
457    v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
458        V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
459    v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
460        V4L2_CID_CONTRAST, 0, 127, 1, 64);
461    v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
462        V4L2_CID_SATURATION, 0, 127, 1, 64);
463    v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
464        V4L2_CID_VFLIP, 0, 1, 1, 0);
465    v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
466        V4L2_CID_HFLIP, 0, 1, 1, 0);
467    if (hdl->error) {
468        err = hdl->error;
469        v4l2_ctrl_handler_free(hdl);
470        return err;
471    }
472    dev->v4l2_dev.ctrl_handler = hdl;
473
474    vv = kzalloc(sizeof(struct saa7146_vv), GFP_KERNEL);
475    if (vv == NULL) {
476        ERR("out of memory. aborting.\n");
477        v4l2_ctrl_handler_free(hdl);
478        return -ENOMEM;
479    }
480    ext_vv->vid_ops = saa7146_video_ioctl_ops;
481    ext_vv->vbi_ops = saa7146_vbi_ioctl_ops;
482    ext_vv->core_ops = &saa7146_video_ioctl_ops;
483
484    DEB_EE("dev:%p\n", dev);
485
486    /* set default values for video parts of the saa7146 */
487    saa7146_write(dev, BCS_CTRL, 0x80400040);
488
489    /* enable video-port pins */
490    saa7146_write(dev, MC1, (MASK_10 | MASK_26));
491
492    /* save per-device extension data (one extension can
493       handle different devices that might need different
494       configuration data) */
495    dev->ext_vv_data = ext_vv;
496
497    vv->d_clipping.cpu_addr = pci_alloc_consistent(dev->pci, SAA7146_CLIPPING_MEM, &vv->d_clipping.dma_handle);
498    if( NULL == vv->d_clipping.cpu_addr ) {
499        ERR("out of memory. aborting.\n");
500        kfree(vv);
501        v4l2_ctrl_handler_free(hdl);
502        return -1;
503    }
504    memset(vv->d_clipping.cpu_addr, 0x0, SAA7146_CLIPPING_MEM);
505
506    saa7146_video_uops.init(dev,vv);
507    if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
508        saa7146_vbi_uops.init(dev,vv);
509
510    fmt = &vv->ov_fb.fmt;
511    fmt->width = vv->standard->h_max_out;
512    fmt->height = vv->standard->v_max_out;
513    fmt->pixelformat = V4L2_PIX_FMT_RGB565;
514    fmt->bytesperline = 2 * fmt->width;
515    fmt->sizeimage = fmt->bytesperline * fmt->height;
516    fmt->colorspace = V4L2_COLORSPACE_SRGB;
517
518    fmt = &vv->video_fmt;
519    fmt->width = 384;
520    fmt->height = 288;
521    fmt->pixelformat = V4L2_PIX_FMT_BGR24;
522    fmt->field = V4L2_FIELD_ANY;
523    fmt->colorspace = V4L2_COLORSPACE_SMPTE170M;
524    fmt->bytesperline = 3 * fmt->width;
525    fmt->sizeimage = fmt->bytesperline * fmt->height;
526
527    vbi = &vv->vbi_fmt;
528    vbi->sampling_rate = 27000000;
529    vbi->offset = 248; /* todo */
530    vbi->samples_per_line = 720 * 2;
531    vbi->sample_format = V4L2_PIX_FMT_GREY;
532
533    /* fixme: this only works for PAL */
534    vbi->start[0] = 5;
535    vbi->count[0] = 16;
536    vbi->start[1] = 312;
537    vbi->count[1] = 16;
538
539    init_timer(&vv->vbi_read_timeout);
540
541    vv->ov_fb.capability = V4L2_FBUF_CAP_LIST_CLIPPING;
542    vv->ov_fb.flags = V4L2_FBUF_FLAG_PRIMARY;
543    dev->vv_data = vv;
544    dev->vv_callback = &vv_callback;
545
546    return 0;
547}
548EXPORT_SYMBOL_GPL(saa7146_vv_init);
549
550int saa7146_vv_release(struct saa7146_dev* dev)
551{
552    struct saa7146_vv *vv = dev->vv_data;
553
554    DEB_EE("dev:%p\n", dev);
555
556    v4l2_device_unregister(&dev->v4l2_dev);
557    pci_free_consistent(dev->pci, SAA7146_CLIPPING_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
558    v4l2_ctrl_handler_free(&dev->ctrl_handler);
559    kfree(vv);
560    dev->vv_data = NULL;
561    dev->vv_callback = NULL;
562
563    return 0;
564}
565EXPORT_SYMBOL_GPL(saa7146_vv_release);
566
567int saa7146_register_device(struct video_device **vid, struct saa7146_dev* dev,
568                char *name, int type)
569{
570    struct video_device *vfd;
571    int err;
572    int i;
573
574    DEB_EE("dev:%p, name:'%s', type:%d\n", dev, name, type);
575
576    // released by vfd->release
577    vfd = video_device_alloc();
578    if (vfd == NULL)
579        return -ENOMEM;
580
581    vfd->fops = &video_fops;
582    if (type == VFL_TYPE_GRABBER)
583        vfd->ioctl_ops = &dev->ext_vv_data->vid_ops;
584    else
585        vfd->ioctl_ops = &dev->ext_vv_data->vbi_ops;
586    vfd->release = video_device_release;
587    /* Locking in file operations other than ioctl should be done by
588       the driver, not the V4L2 core.
589       This driver needs auditing so that this flag can be removed. */
590    set_bit(V4L2_FL_LOCK_ALL_FOPS, &vfd->flags);
591    vfd->lock = &dev->v4l2_lock;
592    vfd->v4l2_dev = &dev->v4l2_dev;
593    vfd->tvnorms = 0;
594    set_bit(V4L2_FL_USE_FH_PRIO, &vfd->flags);
595    for (i = 0; i < dev->ext_vv_data->num_stds; i++)
596        vfd->tvnorms |= dev->ext_vv_data->stds[i].id;
597    strlcpy(vfd->name, name, sizeof(vfd->name));
598    video_set_drvdata(vfd, dev);
599
600    err = video_register_device(vfd, type, -1);
601    if (err < 0) {
602        ERR("cannot register v4l2 device. skipping.\n");
603        video_device_release(vfd);
604        return err;
605    }
606
607    pr_info("%s: registered device %s [v4l2]\n",
608        dev->name, video_device_node_name(vfd));
609
610    *vid = vfd;
611    return 0;
612}
613EXPORT_SYMBOL_GPL(saa7146_register_device);
614
615int saa7146_unregister_device(struct video_device **vid, struct saa7146_dev* dev)
616{
617    DEB_EE("dev:%p\n", dev);
618
619    video_unregister_device(*vid);
620    *vid = NULL;
621
622    return 0;
623}
624EXPORT_SYMBOL_GPL(saa7146_unregister_device);
625
626static int __init saa7146_vv_init_module(void)
627{
628    return 0;
629}
630
631
632static void __exit saa7146_vv_cleanup_module(void)
633{
634}
635
636module_init(saa7146_vv_init_module);
637module_exit(saa7146_vv_cleanup_module);
638
639MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
640MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
641MODULE_LICENSE("GPL");
642

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