drivers/media/common/saa7146_fops.c

   1 #include <media/saa7146_vv.h>
   2
   3 /****************************************************************************/
   4 /* resource management functions, shamelessly stolen from saa7134 driver */
   5
   6 int 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
  30 void 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
  46 void 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
  64 int 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
  85 void 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
 108 void 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
 159 void 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
 188 static 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;
 248 out:
 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
 257 static 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
 285 static 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
 309 static 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
 344 static 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
 367 static 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
 385 static 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
 397 static 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
 421 int 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 }
 468 EXPORT_SYMBOL_GPL(saa7146_vv_init);
 469
 470 int 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 }
 484 EXPORT_SYMBOL_GPL(saa7146_vv_release);
 485
 486 int 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 }
 523 EXPORT_SYMBOL_GPL(saa7146_register_device);
 524
 525 int 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 }
 534 EXPORT_SYMBOL_GPL(saa7146_unregister_device);
 535
 536 static int __init saa7146_vv_init_module(void)
 537 {
 538         return 0;
 539 }
 540
 541
 542 static void __exit saa7146_vv_cleanup_module(void)
 543 {
 544 }
 545
 546 module_init(saa7146_vv_init_module);
 547 module_exit(saa7146_vv_cleanup_module);
 548
 549 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 550 MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
 551 MODULE_LICENSE("GPL");