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         struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
  57         DEB_EE(("dev:%p, buf:%p\n",dev,buf));
  58
  59         BUG_ON(in_interrupt());
  60
  61         videobuf_waiton(&buf->vb,0,0);
  62         videobuf_dma_unmap(q, dma);
  63         videobuf_dma_free(dma);
  64         buf->vb.state = VIDEOBUF_NEEDS_INIT;
  65 }
  66
  67
  68 /********************************************************************************/
  69 /* common buffer functions */
  70
  71 int saa7146_buffer_queue(struct saa7146_dev *dev,
  72                          struct saa7146_dmaqueue *q,
  73                          struct saa7146_buf *buf)
  74 {
  75         assert_spin_locked(&dev->slock);
  76         DEB_EE(("dev:%p, dmaq:%p, buf:%p\n", dev, q, buf));
  77
  78         BUG_ON(!q);
  79
  80         if (NULL == q->curr) {
  81                 q->curr = buf;
  82                 DEB_D(("immediately activating buffer %p\n", buf));
  83                 buf->activate(dev,buf,NULL);
  84         } else {
  85                 list_add_tail(&buf->vb.queue,&q->queue);
  86                 buf->vb.state = VIDEOBUF_QUEUED;
  87                 DEB_D(("adding buffer %p to queue. (active buffer present)\n", buf));
  88         }
  89         return 0;
  90 }
  91
  92 void saa7146_buffer_finish(struct saa7146_dev *dev,
  93                            struct saa7146_dmaqueue *q,
  94                            int state)
  95 {
  96         assert_spin_locked(&dev->slock);
  97         DEB_EE(("dev:%p, dmaq:%p, state:%d\n", dev, q, state));
  98         DEB_EE(("q->curr:%p\n",q->curr));
  99
 100         BUG_ON(!q->curr);
 101
 102         /* finish current buffer */
 103         if (NULL == q->curr) {
 104                 DEB_D(("aiii. no current buffer\n"));
 105                 return;
 106         }
 107
 108         q->curr->vb.state = state;
 109         do_gettimeofday(&q->curr->vb.ts);
 110         wake_up(&q->curr->vb.done);
 111
 112         q->curr = NULL;
 113 }
 114
 115 void saa7146_buffer_next(struct saa7146_dev *dev,
 116                          struct saa7146_dmaqueue *q, int vbi)
 117 {
 118         struct saa7146_buf *buf,*next = NULL;
 119
 120         BUG_ON(!q);
 121
 122         DEB_INT(("dev:%p, dmaq:%p, vbi:%d\n", dev, q, vbi));
 123
 124         assert_spin_locked(&dev->slock);
 125         if (!list_empty(&q->queue)) {
 126                 /* activate next one from queue */
 127                 buf = list_entry(q->queue.next,struct saa7146_buf,vb.queue);
 128                 list_del(&buf->vb.queue);
 129                 if (!list_empty(&q->queue))
 130                         next = list_entry(q->queue.next,struct saa7146_buf, vb.queue);
 131                 q->curr = buf;
 132                 DEB_INT(("next buffer: buf:%p, prev:%p, next:%p\n", 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
 166 void 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
 195 static int fops_open(struct inode *inode, struct file *file)
 196 {
 197         unsigned int minor = iminor(inode);
 198         struct saa7146_dev *h = NULL, *dev = NULL;
 199         struct list_head *list;
 200         struct saa7146_fh *fh = NULL;
 201         int result = 0;
 202
 203         enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 204
 205         DEB_EE(("inode:%p, file:%p, minor:%d\n",inode,file,minor));
 206
 207         if (mutex_lock_interruptible(&saa7146_devices_lock))
 208                 return -ERESTARTSYS;
 209
 210         list_for_each(list,&saa7146_devices) {
 211                 h = list_entry(list, struct saa7146_dev, item);
 212                 if( NULL == h->vv_data ) {
 213                         DEB_D(("device %p has not registered video devices.\n",h));
 214                         continue;
 215                 }
 216                 DEB_D(("trying: %p @ major %d,%d\n",h,h->vv_data->video_minor,h->vv_data->vbi_minor));
 217
 218                 if (h->vv_data->video_minor == minor) {
 219                         dev = h;
 220                 }
 221                 if (h->vv_data->vbi_minor == minor) {
 222                         type = V4L2_BUF_TYPE_VBI_CAPTURE;
 223                         dev = h;
 224                 }
 225         }
 226         if (NULL == dev) {
 227                 DEB_S(("no such video device.\n"));
 228                 result = -ENODEV;
 229                 goto out;
 230         }
 231
 232         DEB_D(("using: %p\n",dev));
 233
 234         /* check if an extension is registered */
 235         if( NULL == dev->ext ) {
 236                 DEB_S(("no extension registered for this device.\n"));
 237                 result = -ENODEV;
 238                 goto out;
 239         }
 240
 241         /* allocate per open data */
 242         fh = kzalloc(sizeof(*fh),GFP_KERNEL);
 243         if (NULL == fh) {
 244                 DEB_S(("cannot allocate memory for per open data.\n"));
 245                 result = -ENOMEM;
 246                 goto out;
 247         }
 248
 249         file->private_data = fh;
 250         fh->dev = dev;
 251         fh->type = type;
 252
 253         if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 254                 DEB_S(("initializing vbi...\n"));
 255                 if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 256                         result = saa7146_vbi_uops.open(dev,file);
 257                 if (dev->ext_vv_data->vbi_fops.open)
 258                         dev->ext_vv_data->vbi_fops.open(inode, file);
 259         } else {
 260                 DEB_S(("initializing video...\n"));
 261                 result = saa7146_video_uops.open(dev,file);
 262         }
 263
 264         if (0 != result) {
 265                 goto out;
 266         }
 267
 268         if( 0 == try_module_get(dev->ext->module)) {
 269                 result = -EINVAL;
 270                 goto out;
 271         }
 272
 273         result = 0;
 274 out:
 275         if( fh != 0 && result != 0 ) {
 276                 kfree(fh);
 277                 file->private_data = NULL;
 278         }
 279         mutex_unlock(&saa7146_devices_lock);
 280         return result;
 281 }
 282
 283 static int fops_release(struct inode *inode, struct file *file)
 284 {
 285         struct saa7146_fh  *fh  = file->private_data;
 286         struct saa7146_dev *dev = fh->dev;
 287
 288         DEB_EE(("inode:%p, file:%p\n",inode,file));
 289
 290         if (mutex_lock_interruptible(&saa7146_devices_lock))
 291                 return -ERESTARTSYS;
 292
 293         if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 294                 if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 295                         saa7146_vbi_uops.release(dev,file);
 296                 if (dev->ext_vv_data->vbi_fops.release)
 297                         dev->ext_vv_data->vbi_fops.release(inode, file);
 298         } else {
 299                 saa7146_video_uops.release(dev,file);
 300         }
 301
 302         module_put(dev->ext->module);
 303         file->private_data = NULL;
 304         kfree(fh);
 305
 306         mutex_unlock(&saa7146_devices_lock);
 307
 308         return 0;
 309 }
 310
 311 static int fops_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 312 {
 313 /*
 314         DEB_EE(("inode:%p, file:%p, cmd:%d, arg:%li\n",inode, file, cmd, arg));
 315 */
 316         return video_usercopy(inode, file, cmd, arg, saa7146_video_do_ioctl);
 317 }
 318
 319 static int fops_mmap(struct file *file, struct vm_area_struct * vma)
 320 {
 321         struct saa7146_fh *fh = file->private_data;
 322         struct videobuf_queue *q;
 323
 324         switch (fh->type) {
 325         case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 326                 DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, vma:%p\n",file, vma));
 327                 q = &fh->video_q;
 328                 break;
 329                 }
 330         case V4L2_BUF_TYPE_VBI_CAPTURE: {
 331                 DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, vma:%p\n",file, vma));
 332                 q = &fh->vbi_q;
 333                 break;
 334                 }
 335         default:
 336                 BUG();
 337                 return 0;
 338         }
 339
 340         return videobuf_mmap_mapper(q,vma);
 341 }
 342
 343 static unsigned int fops_poll(struct file *file, struct poll_table_struct *wait)
 344 {
 345         struct saa7146_fh *fh = file->private_data;
 346         struct videobuf_buffer *buf = NULL;
 347         struct videobuf_queue *q;
 348
 349         DEB_EE(("file:%p, poll:%p\n",file, wait));
 350
 351         if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) {
 352                 if( 0 == fh->vbi_q.streaming )
 353                         return videobuf_poll_stream(file, &fh->vbi_q, wait);
 354                 q = &fh->vbi_q;
 355         } else {
 356                 DEB_D(("using video queue.\n"));
 357                 q = &fh->video_q;
 358         }
 359
 360         if (!list_empty(&q->stream))
 361                 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
 362
 363         if (!buf) {
 364                 DEB_D(("buf == NULL!\n"));
 365                 return POLLERR;
 366         }
 367
 368         poll_wait(file, &buf->done, wait);
 369         if (buf->state == VIDEOBUF_DONE || buf->state == VIDEOBUF_ERROR) {
 370                 DEB_D(("poll succeeded!\n"));
 371                 return POLLIN|POLLRDNORM;
 372         }
 373
 374         DEB_D(("nothing to poll for, buf->state:%d\n",buf->state));
 375         return 0;
 376 }
 377
 378 static ssize_t fops_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 379 {
 380         struct saa7146_fh *fh = file->private_data;
 381
 382         switch (fh->type) {
 383         case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 384 //              DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, data:%p, count:%lun", file, data, (unsigned long)count));
 385                 return saa7146_video_uops.read(file,data,count,ppos);
 386                 }
 387         case V4L2_BUF_TYPE_VBI_CAPTURE: {
 388 //              DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, data:%p, count:%lu\n", file, data, (unsigned long)count));
 389                 if (fh->dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 390                         return saa7146_vbi_uops.read(file,data,count,ppos);
 391                 else
 392                         return -EINVAL;
 393                 }
 394                 break;
 395         default:
 396                 BUG();
 397                 return 0;
 398         }
 399 }
 400
 401 static ssize_t fops_write(struct file *file, const char __user *data, size_t count, loff_t *ppos)
 402 {
 403         struct saa7146_fh *fh = file->private_data;
 404
 405         switch (fh->type) {
 406         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 407                 return -EINVAL;
 408         case V4L2_BUF_TYPE_VBI_CAPTURE:
 409                 if (fh->dev->ext_vv_data->vbi_fops.write)
 410                         return fh->dev->ext_vv_data->vbi_fops.write(file, data, count, ppos);
 411                 else
 412                         return -EINVAL;
 413         default:
 414                 BUG();
 415                 return -EINVAL;
 416         }
 417 }
 418
 419 static const struct file_operations video_fops =
 420 {
 421         .owner          = THIS_MODULE,
 422         .open           = fops_open,
 423         .release        = fops_release,
 424         .read           = fops_read,
 425         .write          = fops_write,
 426         .poll           = fops_poll,
 427         .mmap           = fops_mmap,
 428         .ioctl          = fops_ioctl,
 429         .llseek         = no_llseek,
 430 };
 431
 432 static void vv_callback(struct saa7146_dev *dev, unsigned long status)
 433 {
 434         u32 isr = status;
 435
 436         DEB_INT(("dev:%p, isr:0x%08x\n",dev,(u32)status));
 437
 438         if (0 != (isr & (MASK_27))) {
 439                 DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
 440                 saa7146_video_uops.irq_done(dev,isr);
 441         }
 442
 443         if (0 != (isr & (MASK_28))) {
 444                 u32 mc2 = saa7146_read(dev, MC2);
 445                 if( 0 != (mc2 & MASK_15)) {
 446                         DEB_INT(("irq: RPS1 vbi workaround (0x%08x).\n",isr));
 447                         wake_up(&dev->vv_data->vbi_wq);
 448                         saa7146_write(dev,MC2, MASK_31);
 449                         return;
 450                 }
 451                 DEB_INT(("irq: RPS1 (0x%08x).\n",isr));
 452                 saa7146_vbi_uops.irq_done(dev,isr);
 453         }
 454 }
 455
 456 static struct video_device device_template =
 457 {
 458         .fops           = &video_fops,
 459         .minor          = -1,
 460 };
 461
 462 int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
 463 {
 464         struct saa7146_vv *vv = kzalloc (sizeof(struct saa7146_vv),GFP_KERNEL);
 465         if( NULL == vv ) {
 466                 ERR(("out of memory. aborting.\n"));
 467                 return -1;
 468         }
 469
 470         DEB_EE(("dev:%p\n",dev));
 471
 472         /* set default values for video parts of the saa7146 */
 473         saa7146_write(dev, BCS_CTRL, 0x80400040);
 474
 475         /* enable video-port pins */
 476         saa7146_write(dev, MC1, (MASK_10 | MASK_26));
 477
 478         /* save per-device extension data (one extension can
 479            handle different devices that might need different
 480            configuration data) */
 481         dev->ext_vv_data = ext_vv;
 482
 483         vv->video_minor = -1;
 484         vv->vbi_minor = -1;
 485
 486         vv->d_clipping.cpu_addr = pci_alloc_consistent(dev->pci, SAA7146_CLIPPING_MEM, &vv->d_clipping.dma_handle);
 487         if( NULL == vv->d_clipping.cpu_addr ) {
 488                 ERR(("out of memory. aborting.\n"));
 489                 kfree(vv);
 490                 return -1;
 491         }
 492         memset(vv->d_clipping.cpu_addr, 0x0, SAA7146_CLIPPING_MEM);
 493
 494         saa7146_video_uops.init(dev,vv);
 495         if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 496                 saa7146_vbi_uops.init(dev,vv);
 497
 498         dev->vv_data = vv;
 499         dev->vv_callback = &vv_callback;
 500
 501         return 0;
 502 }
 503 EXPORT_SYMBOL_GPL(saa7146_vv_init);
 504
 505 int saa7146_vv_release(struct saa7146_dev* dev)
 506 {
 507         struct saa7146_vv *vv = dev->vv_data;
 508
 509         DEB_EE(("dev:%p\n",dev));
 510
 511         pci_free_consistent(dev->pci, SAA7146_CLIPPING_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
 512         kfree(vv);
 513         dev->vv_data = NULL;
 514         dev->vv_callback = NULL;
 515
 516         return 0;
 517 }
 518 EXPORT_SYMBOL_GPL(saa7146_vv_release);
 519
 520 int saa7146_register_device(struct video_device **vid, struct saa7146_dev* dev,
 521                             char *name, int type)
 522 {
 523         struct saa7146_vv *vv = dev->vv_data;
 524         struct video_device *vfd;
 525
 526         DEB_EE(("dev:%p, name:'%s', type:%d\n",dev,name,type));
 527
 528         // released by vfd->release
 529         vfd = video_device_alloc();
 530         if (vfd == NULL)
 531                 return -ENOMEM;
 532
 533         memcpy(vfd, &device_template, sizeof(struct video_device));
 534         strlcpy(vfd->name, name, sizeof(vfd->name));
 535         vfd->release = video_device_release;
 536         vfd->priv = dev;
 537
 538         // fixme: -1 should be an insmod parameter *for the extension* (like "video_nr");
 539         if (video_register_device(vfd, type, -1) < 0) {
 540                 ERR(("cannot register v4l2 device. skipping.\n"));
 541                 video_device_release(vfd);
 542                 return -1;
 543         }
 544
 545         if( VFL_TYPE_GRABBER == type ) {
 546                 vv->video_minor = vfd->minor;
 547                 INFO(("%s: registered device video%d [v4l2]\n",
 548                         dev->name, vfd->minor & 0x1f));
 549         } else {
 550                 vv->vbi_minor = vfd->minor;
 551                 INFO(("%s: registered device vbi%d [v4l2]\n",
 552                         dev->name, vfd->minor & 0x1f));
 553         }
 554
 555         *vid = vfd;
 556         return 0;
 557 }
 558 EXPORT_SYMBOL_GPL(saa7146_register_device);
 559
 560 int saa7146_unregister_device(struct video_device **vid, struct saa7146_dev* dev)
 561 {
 562         struct saa7146_vv *vv = dev->vv_data;
 563
 564         DEB_EE(("dev:%p\n",dev));
 565
 566         if( VFL_TYPE_GRABBER == (*vid)->type ) {
 567                 vv->video_minor = -1;
 568         } else {
 569                 vv->vbi_minor = -1;
 570         }
 571
 572         video_unregister_device(*vid);
 573         *vid = NULL;
 574
 575         return 0;
 576 }
 577 EXPORT_SYMBOL_GPL(saa7146_unregister_device);
 578
 579 static int __init saa7146_vv_init_module(void)
 580 {
 581         return 0;
 582 }
 583
 584
 585 static void __exit saa7146_vv_cleanup_module(void)
 586 {
 587 }
 588
 589 module_init(saa7146_vv_init_module);
 590 module_exit(saa7146_vv_cleanup_module);
 591
 592 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 593 MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
 594 MODULE_LICENSE("GPL");