drivers/media/common/saa7146_fops.c

   1 #include <media/saa7146_vv.h>
   2
   3 #define BOARD_CAN_DO_VBI(dev)   (dev->revision != 0 && dev->vv_data->vbi_minor != -1)
   4
   5 /****************************************************************************/
   6 /* resource management functions, shamelessly stolen from saa7134 driver */
   7
   8 int saa7146_res_get(struct saa7146_fh *fh, unsigned int bit)
   9 {
  10         struct saa7146_dev *dev = fh->dev;
  11         struct saa7146_vv *vv = dev->vv_data;
  12
  13         if (fh->resources & bit) {
  14                 DEB_D(("already allocated! want: 0x%02x, cur:0x%02x\n",bit,vv->resources));
  15                 /* have it already allocated */
  16                 return 1;
  17         }
  18
  19         /* is it free? */
  20         mutex_lock(&dev->lock);
  21         if (vv->resources & bit) {
  22                 DEB_D(("locked! vv->resources:0x%02x, we want:0x%02x\n",vv->resources,bit));
  23                 /* no, someone else uses it */
  24                 mutex_unlock(&dev->lock);
  25                 return 0;
  26         }
  27         /* it's free, grab it */
  28         fh->resources  |= bit;
  29         vv->resources |= bit;
  30         DEB_D(("res: get 0x%02x, cur:0x%02x\n",bit,vv->resources));
  31         mutex_unlock(&dev->lock);
  32         return 1;
  33 }
  34
  35 void 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         mutex_lock(&dev->lock);
  43         fh->resources  &= ~bits;
  44         vv->resources &= ~bits;
  45         DEB_D(("res: put 0x%02x, cur:0x%02x\n",bits,vv->resources));
  46         mutex_unlock(&dev->lock);
  47 }
  48
  49
  50 /********************************************************************************/
  51 /* common dma functions */
  52
  53 void saa7146_dma_free(struct saa7146_dev *dev,struct videobuf_queue *q,
  54                                                 struct saa7146_buf *buf)
  55 {
  56         DEB_EE(("dev:%p, buf:%p\n",dev,buf));
  57
  58         BUG_ON(in_interrupt());
  59
  60         videobuf_waiton(&buf->vb,0,0);
  61         videobuf_dma_unmap(q, &buf->vb.dma);
  62         videobuf_dma_free(&buf->vb.dma);
  63         buf->vb.state = STATE_NEEDS_INIT;
  64 }
  65
  66
  67 /********************************************************************************/
  68 /* common buffer functions */
  69
  70 int saa7146_buffer_queue(struct saa7146_dev *dev,
  71                          struct saa7146_dmaqueue *q,
  72                          struct saa7146_buf *buf)
  73 {
  74         assert_spin_locked(&dev->slock);
  75         DEB_EE(("dev:%p, dmaq:%p, buf:%p\n", dev, q, buf));
  76
  77         BUG_ON(!q);
  78
  79         if (NULL == q->curr) {
  80                 q->curr = buf;
  81                 DEB_D(("immediately activating buffer %p\n", buf));
  82                 buf->activate(dev,buf,NULL);
  83         } else {
  84                 list_add_tail(&buf->vb.queue,&q->queue);
  85                 buf->vb.state = STATE_QUEUED;
  86                 DEB_D(("adding buffer %p to queue. (active buffer present)\n", buf));
  87         }
  88         return 0;
  89 }
  90
  91 void 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
 114 void 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", buf, q->queue.prev,q->queue.next));
 132                 buf->activate(dev,buf,next);
 133         } else {
 134                 DEB_INT(("no next buffer. stopping.\n"));
 135                 if( 0 != vbi ) {
 136                         /* turn off video-dma3 */
 137                         saa7146_write(dev,MC1, MASK_20);
 138                 } else {
 139                         /* nothing to do -- just prevent next video-dma1 transfer
 140                            by lowering the protection address */
 141
 142                         // fixme: fix this for vflip != 0
 143
 144                         saa7146_write(dev, PROT_ADDR1, 0);
 145                         saa7146_write(dev, MC2, (MASK_02|MASK_18));
 146
 147                         /* write the address of the rps-program */
 148                         saa7146_write(dev, RPS_ADDR0, dev->d_rps0.dma_handle);
 149                         /* turn on rps */
 150                         saa7146_write(dev, MC1, (MASK_12 | MASK_28));
 151
 152 /*
 153                         printk("vdma%d.base_even:     0x%08x\n", 1,saa7146_read(dev,BASE_EVEN1));
 154                         printk("vdma%d.base_odd:      0x%08x\n", 1,saa7146_read(dev,BASE_ODD1));
 155                         printk("vdma%d.prot_addr:     0x%08x\n", 1,saa7146_read(dev,PROT_ADDR1));
 156                         printk("vdma%d.base_page:     0x%08x\n", 1,saa7146_read(dev,BASE_PAGE1));
 157                         printk("vdma%d.pitch:         0x%08x\n", 1,saa7146_read(dev,PITCH1));
 158                         printk("vdma%d.num_line_byte: 0x%08x\n", 1,saa7146_read(dev,NUM_LINE_BYTE1));
 159 */
 160                 }
 161                 del_timer(&q->timeout);
 162         }
 163 }
 164
 165 void saa7146_buffer_timeout(unsigned long data)
 166 {
 167         struct saa7146_dmaqueue *q = (struct saa7146_dmaqueue*)data;
 168         struct saa7146_dev *dev = q->dev;
 169         unsigned long flags;
 170
 171         DEB_EE(("dev:%p, dmaq:%p\n", dev, q));
 172
 173         spin_lock_irqsave(&dev->slock,flags);
 174         if (q->curr) {
 175                 DEB_D(("timeout on %p\n", q->curr));
 176                 saa7146_buffer_finish(dev,q,STATE_ERROR);
 177         }
 178
 179         /* we don't restart the transfer here like other drivers do. when
 180            a streaming capture is disabled, the timeout function will be
 181            called for the current buffer. if we activate the next buffer now,
 182            we mess up our capture logic. if a timeout occurs on another buffer,
 183            then something is seriously broken before, so no need to buffer the
 184            next capture IMHO... */
 185 /*
 186         saa7146_buffer_next(dev,q);
 187 */
 188         spin_unlock_irqrestore(&dev->slock,flags);
 189 }
 190
 191 /********************************************************************************/
 192 /* file operations */
 193
 194 static int fops_open(struct inode *inode, struct file *file)
 195 {
 196         unsigned int minor = iminor(inode);
 197         struct saa7146_dev *h = NULL, *dev = NULL;
 198         struct list_head *list;
 199         struct saa7146_fh *fh = NULL;
 200         int result = 0;
 201
 202         enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 203
 204         DEB_EE(("inode:%p, file:%p, minor:%d\n",inode,file,minor));
 205
 206         if (mutex_lock_interruptible(&saa7146_devices_lock))
 207                 return -ERESTARTSYS;
 208
 209         list_for_each(list,&saa7146_devices) {
 210                 h = list_entry(list, struct saa7146_dev, item);
 211                 if( NULL == h->vv_data ) {
 212                         DEB_D(("device %p has not registered video devices.\n",h));
 213                         continue;
 214                 }
 215                 DEB_D(("trying: %p @ major %d,%d\n",h,h->vv_data->video_minor,h->vv_data->vbi_minor));
 216
 217                 if (h->vv_data->video_minor == minor) {
 218                         dev = h;
 219                 }
 220                 if (h->vv_data->vbi_minor == minor) {
 221                         type = V4L2_BUF_TYPE_VBI_CAPTURE;
 222                         dev = h;
 223                 }
 224         }
 225         if (NULL == dev) {
 226                 DEB_S(("no such video device.\n"));
 227                 result = -ENODEV;
 228                 goto out;
 229         }
 230
 231         DEB_D(("using: %p\n",dev));
 232
 233         /* check if an extension is registered */
 234         if( NULL == dev->ext ) {
 235                 DEB_S(("no extension registered for this device.\n"));
 236                 result = -ENODEV;
 237                 goto out;
 238         }
 239
 240         /* allocate per open data */
 241         fh = kzalloc(sizeof(*fh),GFP_KERNEL);
 242         if (NULL == fh) {
 243                 DEB_S(("cannot allocate memory for per open data.\n"));
 244                 result = -ENOMEM;
 245                 goto out;
 246         }
 247
 248         file->private_data = fh;
 249         fh->dev = dev;
 250         fh->type = type;
 251
 252         if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 253                 DEB_S(("initializing vbi...\n"));
 254                 if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 255                         result = saa7146_vbi_uops.open(dev,file);
 256                 if (dev->ext_vv_data->vbi_fops.open)
 257                         dev->ext_vv_data->vbi_fops.open(inode, file);
 258         } else {
 259                 DEB_S(("initializing video...\n"));
 260                 result = saa7146_video_uops.open(dev,file);
 261         }
 262
 263         if (0 != result) {
 264                 goto out;
 265         }
 266
 267         if( 0 == try_module_get(dev->ext->module)) {
 268                 result = -EINVAL;
 269                 goto out;
 270         }
 271
 272         result = 0;
 273 out:
 274         if( fh != 0 && result != 0 ) {
 275                 kfree(fh);
 276                 file->private_data = NULL;
 277         }
 278         mutex_unlock(&saa7146_devices_lock);
 279         return result;
 280 }
 281
 282 static int fops_release(struct inode *inode, struct file *file)
 283 {
 284         struct saa7146_fh  *fh  = file->private_data;
 285         struct saa7146_dev *dev = fh->dev;
 286
 287         DEB_EE(("inode:%p, file:%p\n",inode,file));
 288
 289         if (mutex_lock_interruptible(&saa7146_devices_lock))
 290                 return -ERESTARTSYS;
 291
 292         if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 293                 if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 294                         saa7146_vbi_uops.release(dev,file);
 295                 if (dev->ext_vv_data->vbi_fops.release)
 296                         dev->ext_vv_data->vbi_fops.release(inode, file);
 297         } else {
 298                 saa7146_video_uops.release(dev,file);
 299         }
 300
 301         module_put(dev->ext->module);
 302         file->private_data = NULL;
 303         kfree(fh);
 304
 305         mutex_unlock(&saa7146_devices_lock);
 306
 307         return 0;
 308 }
 309
 310 static int fops_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 311 {
 312 /*
 313         DEB_EE(("inode:%p, file:%p, cmd:%d, arg:%li\n",inode, file, cmd, arg));
 314 */
 315         return video_usercopy(inode, file, cmd, arg, saa7146_video_do_ioctl);
 316 }
 317
 318 static int fops_mmap(struct file *file, struct vm_area_struct * vma)
 319 {
 320         struct saa7146_fh *fh = file->private_data;
 321         struct videobuf_queue *q;
 322
 323         switch (fh->type) {
 324         case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 325                 DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, vma:%p\n",file, vma));
 326                 q = &fh->video_q;
 327                 break;
 328                 }
 329         case V4L2_BUF_TYPE_VBI_CAPTURE: {
 330                 DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, vma:%p\n",file, vma));
 331                 q = &fh->vbi_q;
 332                 break;
 333                 }
 334         default:
 335                 BUG();
 336                 return 0;
 337         }
 338
 339         return videobuf_mmap_mapper(q,vma);
 340 }
 341
 342 static unsigned int fops_poll(struct file *file, struct poll_table_struct *wait)
 343 {
 344         struct saa7146_fh *fh = file->private_data;
 345         struct videobuf_buffer *buf = NULL;
 346         struct videobuf_queue *q;
 347
 348         DEB_EE(("file:%p, poll:%p\n",file, wait));
 349
 350         if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) {
 351                 if( 0 == fh->vbi_q.streaming )
 352                         return videobuf_poll_stream(file, &fh->vbi_q, wait);
 353                 q = &fh->vbi_q;
 354         } else {
 355                 DEB_D(("using video queue.\n"));
 356                 q = &fh->video_q;
 357         }
 358
 359         if (!list_empty(&q->stream))
 360                 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
 361
 362         if (!buf) {
 363                 DEB_D(("buf == NULL!\n"));
 364                 return POLLERR;
 365         }
 366
 367         poll_wait(file, &buf->done, wait);
 368         if (buf->state == STATE_DONE || buf->state == STATE_ERROR) {
 369                 DEB_D(("poll succeeded!\n"));
 370                 return POLLIN|POLLRDNORM;
 371         }
 372
 373         DEB_D(("nothing to poll for, buf->state:%d\n",buf->state));
 374         return 0;
 375 }
 376
 377 static ssize_t fops_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 378 {
 379         struct saa7146_fh *fh = file->private_data;
 380
 381         switch (fh->type) {
 382         case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 383 //              DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, data:%p, count:%lun", file, data, (unsigned long)count));
 384                 return saa7146_video_uops.read(file,data,count,ppos);
 385                 }
 386         case V4L2_BUF_TYPE_VBI_CAPTURE: {
 387 //              DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, data:%p, count:%lu\n", file, data, (unsigned long)count));
 388                 if (fh->dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 389                         return saa7146_vbi_uops.read(file,data,count,ppos);
 390                 else
 391                         return -EINVAL;
 392                 }
 393                 break;
 394         default:
 395                 BUG();
 396                 return 0;
 397         }
 398 }
 399
 400 static ssize_t fops_write(struct file *file, const char __user *data, size_t count, loff_t *ppos)
 401 {
 402         struct saa7146_fh *fh = file->private_data;
 403
 404         switch (fh->type) {
 405         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 406                 return -EINVAL;
 407         case V4L2_BUF_TYPE_VBI_CAPTURE:
 408                 if (fh->dev->ext_vv_data->vbi_fops.write)
 409                         return fh->dev->ext_vv_data->vbi_fops.write(file, data, count, ppos);
 410                 else
 411                         return -EINVAL;
 412         default:
 413                 BUG();
 414                 return -EINVAL;
 415         }
 416 }
 417
 418 static const struct file_operations video_fops =
 419 {
 420         .owner          = THIS_MODULE,
 421         .open           = fops_open,
 422         .release        = fops_release,
 423         .read           = fops_read,
 424         .write          = fops_write,
 425         .poll           = fops_poll,
 426         .mmap           = fops_mmap,
 427         .ioctl          = fops_ioctl,
 428         .llseek         = no_llseek,
 429 };
 430
 431 static void vv_callback(struct saa7146_dev *dev, unsigned long status)
 432 {
 433         u32 isr = status;
 434
 435         DEB_INT(("dev:%p, isr:0x%08x\n",dev,(u32)status));
 436
 437         if (0 != (isr & (MASK_27))) {
 438                 DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
 439                 saa7146_video_uops.irq_done(dev,isr);
 440         }
 441
 442         if (0 != (isr & (MASK_28))) {
 443                 u32 mc2 = saa7146_read(dev, MC2);
 444                 if( 0 != (mc2 & MASK_15)) {
 445                         DEB_INT(("irq: RPS1 vbi workaround (0x%08x).\n",isr));
 446                         wake_up(&dev->vv_data->vbi_wq);
 447                         saa7146_write(dev,MC2, MASK_31);
 448                         return;
 449                 }
 450                 DEB_INT(("irq: RPS1 (0x%08x).\n",isr));
 451                 saa7146_vbi_uops.irq_done(dev,isr);
 452         }
 453 }
 454
 455 static struct video_device device_template =
 456 {
 457         .fops           = &video_fops,
 458         .minor          = -1,
 459 };
 460
 461 int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
 462 {
 463         struct saa7146_vv *vv = kzalloc (sizeof(struct saa7146_vv),GFP_KERNEL);
 464         if( NULL == vv ) {
 465                 ERR(("out of memory. aborting.\n"));
 466                 return -1;
 467         }
 468
 469         DEB_EE(("dev:%p\n",dev));
 470
 471         /* set default values for video parts of the saa7146 */
 472         saa7146_write(dev, BCS_CTRL, 0x80400040);
 473
 474         /* enable video-port pins */
 475         saa7146_write(dev, MC1, (MASK_10 | MASK_26));
 476
 477         /* save per-device extension data (one extension can
 478            handle different devices that might need different
 479            configuration data) */
 480         dev->ext_vv_data = ext_vv;
 481
 482         vv->video_minor = -1;
 483         vv->vbi_minor = -1;
 484
 485         vv->d_clipping.cpu_addr = pci_alloc_consistent(dev->pci, SAA7146_CLIPPING_MEM, &vv->d_clipping.dma_handle);
 486         if( NULL == vv->d_clipping.cpu_addr ) {
 487                 ERR(("out of memory. aborting.\n"));
 488                 kfree(vv);
 489                 return -1;
 490         }
 491         memset(vv->d_clipping.cpu_addr, 0x0, SAA7146_CLIPPING_MEM);
 492
 493         saa7146_video_uops.init(dev,vv);
 494         if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 495                 saa7146_vbi_uops.init(dev,vv);
 496
 497         dev->vv_data = vv;
 498         dev->vv_callback = &vv_callback;
 499
 500         return 0;
 501 }
 502 EXPORT_SYMBOL_GPL(saa7146_vv_init);
 503
 504 int saa7146_vv_release(struct saa7146_dev* dev)
 505 {
 506         struct saa7146_vv *vv = dev->vv_data;
 507
 508         DEB_EE(("dev:%p\n",dev));
 509
 510         pci_free_consistent(dev->pci, SAA7146_CLIPPING_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
 511         kfree(vv);
 512         dev->vv_data = NULL;
 513         dev->vv_callback = NULL;
 514
 515         return 0;
 516 }
 517 EXPORT_SYMBOL_GPL(saa7146_vv_release);
 518
 519 int saa7146_register_device(struct video_device **vid, struct saa7146_dev* dev,
 520                             char *name, int type)
 521 {
 522         struct saa7146_vv *vv = dev->vv_data;
 523         struct video_device *vfd;
 524
 525         DEB_EE(("dev:%p, name:'%s', type:%d\n",dev,name,type));
 526
 527         // released by vfd->release
 528         vfd = video_device_alloc();
 529         if (vfd == NULL)
 530                 return -ENOMEM;
 531
 532         memcpy(vfd, &device_template, sizeof(struct video_device));
 533         strlcpy(vfd->name, name, sizeof(vfd->name));
 534         vfd->release = video_device_release;
 535         vfd->priv = dev;
 536
 537         // fixme: -1 should be an insmod parameter *for the extension* (like "video_nr");
 538         if (video_register_device(vfd, type, -1) < 0) {
 539                 ERR(("cannot register v4l2 device. skipping.\n"));
 540                 return -1;
 541         }
 542
 543         if( VFL_TYPE_GRABBER == type ) {
 544                 vv->video_minor = vfd->minor;
 545                 INFO(("%s: registered device video%d [v4l2]\n",
 546                         dev->name, vfd->minor & 0x1f));
 547         } else {
 548                 vv->vbi_minor = vfd->minor;
 549                 INFO(("%s: registered device vbi%d [v4l2]\n",
 550                         dev->name, vfd->minor & 0x1f));
 551         }
 552
 553         *vid = vfd;
 554         return 0;
 555 }
 556 EXPORT_SYMBOL_GPL(saa7146_register_device);
 557
 558 int saa7146_unregister_device(struct video_device **vid, struct saa7146_dev* dev)
 559 {
 560         struct saa7146_vv *vv = dev->vv_data;
 561
 562         DEB_EE(("dev:%p\n",dev));
 563
 564         if( VFL_TYPE_GRABBER == (*vid)->type ) {
 565                 vv->video_minor = -1;
 566         } else {
 567                 vv->vbi_minor = -1;
 568         }
 569
 570         video_unregister_device(*vid);
 571         *vid = NULL;
 572
 573         return 0;
 574 }
 575 EXPORT_SYMBOL_GPL(saa7146_unregister_device);
 576
 577 static int __init saa7146_vv_init_module(void)
 578 {
 579         return 0;
 580 }
 581
 582
 583 static void __exit saa7146_vv_cleanup_module(void)
 584 {
 585 }
 586
 587 module_init(saa7146_vv_init_module);
 588 module_exit(saa7146_vv_cleanup_module);
 589
 590 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 591 MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
 592 MODULE_LICENSE("GPL");