LXR linux/drivers/media/common/saa7146

   1#include <media/saa7146_vv.h>
   2
   3/****************************************************************************/
   4/* resource management functions, shamelessly stolen from saa7134 driver */
   5
   6int saa7146_res_get(struct saa7146_fh *fh, unsigned int bit)
   7{
   8        struct saa7146_dev *dev = fh->dev;
   9        struct saa7146_vv *vv = dev->vv_data;
  10
  11        if (fh->resources & bit) {
  12                DEB_D(("already allocated! want: 0x%02x, cur:0x%02x\n",bit,vv->resources));
  13                /* have it already allocated */
  14                return 1;
  15        }
  16
  17        /* is it free? */
  18        if (vv->resources & bit) {
  19                DEB_D(("locked! vv->resources:0x%02x, we want:0x%02x\n",vv->resources,bit));
  20                /* no, someone else uses it */
  21                return 0;
  22        }
  23        /* it's free, grab it */
  24        fh->resources  |= bit;
  25        vv->resources |= bit;
  26        DEB_D(("res: get 0x%02x, cur:0x%02x\n",bit,vv->resources));
  27        return 1;
  28}
  29
  30void saa7146_res_free(struct saa7146_fh *fh, unsigned int bits)
  31{
  32        struct saa7146_dev *dev = fh->dev;
  33        struct saa7146_vv *vv = dev->vv_data;
  34
  35        BUG_ON((fh->resources & bits) != bits);
  36
  37        fh->resources  &= ~bits;
  38        vv->resources &= ~bits;
  39        DEB_D(("res: put 0x%02x, cur:0x%02x\n",bits,vv->resources));
  40}
  41
  42
  43/********************************************************************************/
  44/* common dma functions */
  45
  46void saa7146_dma_free(struct saa7146_dev *dev,struct videobuf_queue *q,
  47                                                struct saa7146_buf *buf)
  48{
  49        struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
  50        DEB_EE(("dev:%p, buf:%p\n",dev,buf));
  51
  52        BUG_ON(in_interrupt());
  53
  54        videobuf_waiton(q, &buf->vb, 0, 0);
  55        videobuf_dma_unmap(q->dev, dma);
  56        videobuf_dma_free(dma);
  57        buf->vb.state = VIDEOBUF_NEEDS_INIT;
  58}
  59
  60
  61/********************************************************************************/
  62/* common buffer functions */
  63
  64int saa7146_buffer_queue(struct saa7146_dev *dev,
  65                         struct saa7146_dmaqueue *q,
  66                         struct saa7146_buf *buf)
  67{
  68        assert_spin_locked(&dev->slock);
  69        DEB_EE(("dev:%p, dmaq:%p, buf:%p\n", dev, q, buf));
  70
  71        BUG_ON(!q);
  72
  73        if (NULL == q->curr) {
  74                q->curr = buf;
  75                DEB_D(("immediately activating buffer %p\n", buf));
  76                buf->activate(dev,buf,NULL);
  77        } else {
  78                list_add_tail(&buf->vb.queue,&q->queue);
  79                buf->vb.state = VIDEOBUF_QUEUED;
  80                DEB_D(("adding buffer %p to queue. (active buffer present)\n", buf));
  81        }
  82        return 0;
  83}
  84
  85void saa7146_buffer_finish(struct saa7146_dev *dev,
  86                           struct saa7146_dmaqueue *q,
  87                           int state)
  88{
  89        assert_spin_locked(&dev->slock);
  90        DEB_EE(("dev:%p, dmaq:%p, state:%d\n", dev, q, state));
  91        DEB_EE(("q->curr:%p\n",q->curr));
  92
  93        BUG_ON(!q->curr);
  94
  95        /* finish current buffer */
  96        if (NULL == q->curr) {
  97                DEB_D(("aiii. no current buffer\n"));
  98                return;
  99        }
 100
 101        q->curr->vb.state = state;
 102        do_gettimeofday(&q->curr->vb.ts);
 103        wake_up(&q->curr->vb.done);
 104
 105        q->curr = NULL;
 106}
 107
 108void saa7146_buffer_next(struct saa7146_dev *dev,
 109                         struct saa7146_dmaqueue *q, int vbi)
 110{
 111        struct saa7146_buf *buf,*next = NULL;
 112
 113        BUG_ON(!q);
 114
 115        DEB_INT(("dev:%p, dmaq:%p, vbi:%d\n", dev, q, vbi));
 116
 117        assert_spin_locked(&dev->slock);
 118        if (!list_empty(&q->queue)) {
 119                /* activate next one from queue */
 120                buf = list_entry(q->queue.next,struct saa7146_buf,vb.queue);
 121                list_del(&buf->vb.queue);
 122                if (!list_empty(&q->queue))
 123                        next = list_entry(q->queue.next,struct saa7146_buf, vb.queue);
 124                q->curr = buf;
 125                DEB_INT(("next buffer: buf:%p, prev:%p, next:%p\n", buf, q->queue.prev,q->queue.next));
 126                buf->activate(dev,buf,next);
 127        } else {
 128                DEB_INT(("no next buffer. stopping.\n"));
 129                if( 0 != vbi ) {
 130                        /* turn off video-dma3 */
 131                        saa7146_write(dev,MC1, MASK_20);
 132                } else {
 133                        /* nothing to do -- just prevent next video-dma1 transfer
 134                           by lowering the protection address */
 135
 136                        // fixme: fix this for vflip != 0
 137
 138                        saa7146_write(dev, PROT_ADDR1, 0);
 139                        saa7146_write(dev, MC2, (MASK_02|MASK_18));
 140
 141                        /* write the address of the rps-program */
 142                        saa7146_write(dev, RPS_ADDR0, dev->d_rps0.dma_handle);
 143                        /* turn on rps */
 144                        saa7146_write(dev, MC1, (MASK_12 | MASK_28));
 145
 146/*
 147                        printk("vdma%d.base_even:     0x%08x\n", 1,saa7146_read(dev,BASE_EVEN1));
 148                        printk("vdma%d.base_odd:      0x%08x\n", 1,saa7146_read(dev,BASE_ODD1));
 149                        printk("vdma%d.prot_addr:     0x%08x\n", 1,saa7146_read(dev,PROT_ADDR1));
 150                        printk("vdma%d.base_page:     0x%08x\n", 1,saa7146_read(dev,BASE_PAGE1));
 151                        printk("vdma%d.pitch:         0x%08x\n", 1,saa7146_read(dev,PITCH1));
 152                        printk("vdma%d.num_line_byte: 0x%08x\n", 1,saa7146_read(dev,NUM_LINE_BYTE1));
 153*/
 154                }
 155                del_timer(&q->timeout);
 156        }
 157}
 158
 159void saa7146_buffer_timeout(unsigned long data)
 160{
 161        struct saa7146_dmaqueue *q = (struct saa7146_dmaqueue*)data;
 162        struct saa7146_dev *dev = q->dev;
 163        unsigned long flags;
 164
 165        DEB_EE(("dev:%p, dmaq:%p\n", dev, q));
 166
 167        spin_lock_irqsave(&dev->slock,flags);
 168        if (q->curr) {
 169                DEB_D(("timeout on %p\n", q->curr));
 170                saa7146_buffer_finish(dev,q,VIDEOBUF_ERROR);
 171        }
 172
 173        /* we don't restart the transfer here like other drivers do. when
 174           a streaming capture is disabled, the timeout function will be
 175           called for the current buffer. if we activate the next buffer now,
 176           we mess up our capture logic. if a timeout occurs on another buffer,
 177           then something is seriously broken before, so no need to buffer the
 178           next capture IMHO... */
 179/*
 180        saa7146_buffer_next(dev,q);
 181*/
 182        spin_unlock_irqrestore(&dev->slock,flags);
 183}
 184
 185/********************************************************************************/
 186/* file operations */
 187
 188static int fops_open(struct file *file)
 189{
 190        struct video_device *vdev = video_devdata(file);
 191        struct saa7146_dev *dev = video_drvdata(file);
 192        struct saa7146_fh *fh = NULL;
 193        int result = 0;
 194
 195        enum v4l2_buf_type type;
 196
 197        DEB_EE(("file:%p, dev:%s\n", file, video_device_node_name(vdev)));
 198
 199        if (mutex_lock_interruptible(&saa7146_devices_lock))
 200                return -ERESTARTSYS;
 201
 202        DEB_D(("using: %p\n",dev));
 203
 204        type = vdev->vfl_type == VFL_TYPE_GRABBER
 205             ? V4L2_BUF_TYPE_VIDEO_CAPTURE
 206             : V4L2_BUF_TYPE_VBI_CAPTURE;
 207
 208        /* check if an extension is registered */
 209        if( NULL == dev->ext ) {
 210                DEB_S(("no extension registered for this device.\n"));
 211                result = -ENODEV;
 212                goto out;
 213        }
 214
 215        /* allocate per open data */
 216        fh = kzalloc(sizeof(*fh),GFP_KERNEL);
 217        if (NULL == fh) {
 218                DEB_S(("cannot allocate memory for per open data.\n"));
 219                result = -ENOMEM;
 220                goto out;
 221        }
 222
 223        file->private_data = fh;
 224        fh->dev = dev;
 225        fh->type = type;
 226
 227        if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 228                DEB_S(("initializing vbi...\n"));
 229                if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 230                        result = saa7146_vbi_uops.open(dev,file);
 231                if (dev->ext_vv_data->vbi_fops.open)
 232                        dev->ext_vv_data->vbi_fops.open(file);
 233        } else {
 234                DEB_S(("initializing video...\n"));
 235                result = saa7146_video_uops.open(dev,file);
 236        }
 237
 238        if (0 != result) {
 239                goto out;
 240        }
 241
 242        if( 0 == try_module_get(dev->ext->module)) {
 243                result = -EINVAL;
 244                goto out;
 245        }
 246
 247        result = 0;
 248out:
 249        if (fh && result != 0) {
 250                kfree(fh);
 251                file->private_data = NULL;
 252        }
 253        mutex_unlock(&saa7146_devices_lock);
 254        return result;
 255}
 256
 257static int fops_release(struct file *file)
 258{
 259        struct saa7146_fh  *fh  = file->private_data;
 260        struct saa7146_dev *dev = fh->dev;
 261
 262        DEB_EE(("file:%p\n", file));
 263
 264        if (mutex_lock_interruptible(&saa7146_devices_lock))
 265                return -ERESTARTSYS;
 266
 267        if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 268                if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 269                        saa7146_vbi_uops.release(dev,file);
 270                if (dev->ext_vv_data->vbi_fops.release)
 271                        dev->ext_vv_data->vbi_fops.release(file);
 272        } else {
 273                saa7146_video_uops.release(dev,file);
 274        }
 275
 276        module_put(dev->ext->module);
 277        file->private_data = NULL;
 278        kfree(fh);
 279
 280        mutex_unlock(&saa7146_devices_lock);
 281
 282        return 0;
 283}
 284
 285static int fops_mmap(struct file *file, struct vm_area_struct * vma)
 286{
 287        struct saa7146_fh *fh = file->private_data;
 288        struct videobuf_queue *q;
 289
 290        switch (fh->type) {
 291        case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 292                DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, vma:%p\n",file, vma));
 293                q = &fh->video_q;
 294                break;
 295                }
 296        case V4L2_BUF_TYPE_VBI_CAPTURE: {
 297                DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, vma:%p\n",file, vma));
 298                q = &fh->vbi_q;
 299                break;
 300                }
 301        default:
 302                BUG();
 303                return 0;
 304        }
 305
 306        return videobuf_mmap_mapper(q,vma);
 307}
 308
 309static unsigned int fops_poll(struct file *file, struct poll_table_struct *wait)
 310{
 311        struct saa7146_fh *fh = file->private_data;
 312        struct videobuf_buffer *buf = NULL;
 313        struct videobuf_queue *q;
 314
 315        DEB_EE(("file:%p, poll:%p\n",file, wait));
 316
 317        if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) {
 318                if( 0 == fh->vbi_q.streaming )
 319                        return videobuf_poll_stream(file, &fh->vbi_q, wait);
 320                q = &fh->vbi_q;
 321        } else {
 322                DEB_D(("using video queue.\n"));
 323                q = &fh->video_q;
 324        }
 325
 326        if (!list_empty(&q->stream))
 327                buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
 328
 329        if (!buf) {
 330                DEB_D(("buf == NULL!\n"));
 331                return POLLERR;
 332        }
 333
 334        poll_wait(file, &buf->done, wait);
 335        if (buf->state == VIDEOBUF_DONE || buf->state == VIDEOBUF_ERROR) {
 336                DEB_D(("poll succeeded!\n"));
 337                return POLLIN|POLLRDNORM;
 338        }
 339
 340        DEB_D(("nothing to poll for, buf->state:%d\n",buf->state));
 341        return 0;
 342}
 343
 344static ssize_t fops_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 345{
 346        struct saa7146_fh *fh = file->private_data;
 347
 348        switch (fh->type) {
 349        case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 350//              DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, data:%p, count:%lun", file, data, (unsigned long)count));
 351                return saa7146_video_uops.read(file,data,count,ppos);
 352                }
 353        case V4L2_BUF_TYPE_VBI_CAPTURE: {
 354//              DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, data:%p, count:%lu\n", file, data, (unsigned long)count));
 355                if (fh->dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 356                        return saa7146_vbi_uops.read(file,data,count,ppos);
 357                else
 358                        return -EINVAL;
 359                }
 360                break;
 361        default:
 362                BUG();
 363                return 0;
 364        }
 365}
 366
 367static ssize_t fops_write(struct file *file, const char __user *data, size_t count, loff_t *ppos)
 368{
 369        struct saa7146_fh *fh = file->private_data;
 370
 371        switch (fh->type) {
 372        case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 373                return -EINVAL;
 374        case V4L2_BUF_TYPE_VBI_CAPTURE:
 375                if (fh->dev->ext_vv_data->vbi_fops.write)
 376                        return fh->dev->ext_vv_data->vbi_fops.write(file, data, count, ppos);
 377                else
 378                        return -EINVAL;
 379        default:
 380                BUG();
 381                return -EINVAL;
 382        }
 383}
 384
 385static const struct v4l2_file_operations video_fops =
 386{
 387        .owner          = THIS_MODULE,
 388        .open           = fops_open,
 389        .release        = fops_release,
 390        .read           = fops_read,
 391        .write          = fops_write,
 392        .poll           = fops_poll,
 393        .mmap           = fops_mmap,
 394        .unlocked_ioctl = video_ioctl2,
 395};
 396
 397static void vv_callback(struct saa7146_dev *dev, unsigned long status)
 398{
 399        u32 isr = status;
 400
 401        DEB_INT(("dev:%p, isr:0x%08x\n",dev,(u32)status));
 402
 403        if (0 != (isr & (MASK_27))) {
 404                DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
 405                saa7146_video_uops.irq_done(dev,isr);
 406        }
 407
 408        if (0 != (isr & (MASK_28))) {
 409                u32 mc2 = saa7146_read(dev, MC2);
 410                if( 0 != (mc2 & MASK_15)) {
 411                        DEB_INT(("irq: RPS1 vbi workaround (0x%08x).\n",isr));
 412                        wake_up(&dev->vv_data->vbi_wq);
 413                        saa7146_write(dev,MC2, MASK_31);
 414                        return;
 415                }
 416                DEB_INT(("irq: RPS1 (0x%08x).\n",isr));
 417                saa7146_vbi_uops.irq_done(dev,isr);
 418        }
 419}
 420
 421int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
 422{
 423        struct saa7146_vv *vv;
 424        int err;
 425
 426        err = v4l2_device_register(&dev->pci->dev, &dev->v4l2_dev);
 427        if (err)
 428                return err;
 429
 430        vv = kzalloc(sizeof(struct saa7146_vv), GFP_KERNEL);
 431        if (vv == NULL) {
 432                ERR(("out of memory. aborting.\n"));
 433                return -ENOMEM;
 434        }
 435        ext_vv->ops = saa7146_video_ioctl_ops;
 436        ext_vv->core_ops = &saa7146_video_ioctl_ops;
 437
 438        DEB_EE(("dev:%p\n",dev));
 439
 440        /* set default values for video parts of the saa7146 */
 441        saa7146_write(dev, BCS_CTRL, 0x80400040);
 442
 443        /* enable video-port pins */
 444        saa7146_write(dev, MC1, (MASK_10 | MASK_26));
 445
 446        /* save per-device extension data (one extension can
 447           handle different devices that might need different
 448           configuration data) */
 449        dev->ext_vv_data = ext_vv;
 450
 451        vv->d_clipping.cpu_addr = pci_alloc_consistent(dev->pci, SAA7146_CLIPPING_MEM, &vv->d_clipping.dma_handle);
 452        if( NULL == vv->d_clipping.cpu_addr ) {
 453                ERR(("out of memory. aborting.\n"));
 454                kfree(vv);
 455                return -1;
 456        }
 457        memset(vv->d_clipping.cpu_addr, 0x0, SAA7146_CLIPPING_MEM);
 458
 459        saa7146_video_uops.init(dev,vv);
 460        if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 461                saa7146_vbi_uops.init(dev,vv);
 462
 463        dev->vv_data = vv;
 464        dev->vv_callback = &vv_callback;
 465
 466        return 0;
 467}
 468EXPORT_SYMBOL_GPL(saa7146_vv_init);
 469
 470int saa7146_vv_release(struct saa7146_dev* dev)
 471{
 472        struct saa7146_vv *vv = dev->vv_data;
 473
 474        DEB_EE(("dev:%p\n",dev));
 475
 476        v4l2_device_unregister(&dev->v4l2_dev);
 477        pci_free_consistent(dev->pci, SAA7146_CLIPPING_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
 478        kfree(vv);
 479        dev->vv_data = NULL;
 480        dev->vv_callback = NULL;
 481
 482        return 0;
 483}
 484EXPORT_SYMBOL_GPL(saa7146_vv_release);
 485
 486int saa7146_register_device(struct video_device **vid, struct saa7146_dev* dev,
 487                            char *name, int type)
 488{
 489        struct video_device *vfd;
 490        int err;
 491        int i;
 492
 493        DEB_EE(("dev:%p, name:'%s', type:%d\n",dev,name,type));
 494
 495        // released by vfd->release
 496        vfd = video_device_alloc();
 497        if (vfd == NULL)
 498                return -ENOMEM;
 499
 500        vfd->fops = &video_fops;
 501        vfd->ioctl_ops = &dev->ext_vv_data->ops;
 502        vfd->release = video_device_release;
 503        vfd->lock = &dev->v4l2_lock;
 504        vfd->tvnorms = 0;
 505        for (i = 0; i < dev->ext_vv_data->num_stds; i++)
 506                vfd->tvnorms |= dev->ext_vv_data->stds[i].id;
 507        strlcpy(vfd->name, name, sizeof(vfd->name));
 508        video_set_drvdata(vfd, dev);
 509
 510        err = video_register_device(vfd, type, -1);
 511        if (err < 0) {
 512                ERR(("cannot register v4l2 device. skipping.\n"));
 513                video_device_release(vfd);
 514                return err;
 515        }
 516
 517        INFO(("%s: registered device %s [v4l2]\n",
 518                dev->name, video_device_node_name(vfd)));
 519
 520        *vid = vfd;
 521        return 0;
 522}
 523EXPORT_SYMBOL_GPL(saa7146_register_device);
 524
 525int saa7146_unregister_device(struct video_device **vid, struct saa7146_dev* dev)
 526{
 527        DEB_EE(("dev:%p\n",dev));
 528
 529        video_unregister_device(*vid);
 530        *vid = NULL;
 531
 532        return 0;
 533}
 534EXPORT_SYMBOL_GPL(saa7146_unregister_device);
 535
 536static int __init saa7146_vv_init_module(void)
 537{
 538        return 0;
 539}
 540
 541
 542static void __exit saa7146_vv_cleanup_module(void)
 543{
 544}
 545
 546module_init(saa7146_vv_init_module);
 547module_exit(saa7146_vv_cleanup_module);
 548
 549MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 550MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
 551MODULE_LICENSE("GPL");
 552