release/src-rt-6.x.4708/linux/linux-2.6.36/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         mutex_lock(&dev->lock);
  19         if (vv->resources & bit) {
  20                 DEB_D(("locked! vv->resources:0x%02x, we want:0x%02x\n",vv->resources,bit));
  21                 /* no, someone else uses it */
  22                 mutex_unlock(&dev->lock);
  23                 return 0;
  24         }
  25         /* it's free, grab it */
  26         fh->resources  |= bit;
  27         vv->resources |= bit;
  28         DEB_D(("res: get 0x%02x, cur:0x%02x\n",bit,vv->resources));
  29         mutex_unlock(&dev->lock);
  30         return 1;
  31 }
  32
  33 void saa7146_res_free(struct saa7146_fh *fh, unsigned int bits)
  34 {
  35         struct saa7146_dev *dev = fh->dev;
  36         struct saa7146_vv *vv = dev->vv_data;
  37
  38         BUG_ON((fh->resources & bits) != bits);
  39
  40         mutex_lock(&dev->lock);
  41         fh->resources  &= ~bits;
  42         vv->resources &= ~bits;
  43         DEB_D(("res: put 0x%02x, cur:0x%02x\n",bits,vv->resources));
  44         mutex_unlock(&dev->lock);
  45 }
  46
  47
  48 /********************************************************************************/
  49 /* common dma functions */
  50
  51 void 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(&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
  69 int 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", buf));
  86         }
  87         return 0;
  88 }
  89
  90 void saa7146_buffer_finish(struct saa7146_dev *dev,
  91                            struct saa7146_dmaqueue *q,
  92                            int state)
  93 {
  94         assert_spin_locked(&dev->slock);
  95         DEB_EE(("dev:%p, dmaq:%p, state:%d\n", dev, q, state));
  96         DEB_EE(("q->curr:%p\n",q->curr));
  97
  98         BUG_ON(!q->curr);
  99
 100         /* finish current buffer */
 101         if (NULL == q->curr) {
 102                 DEB_D(("aiii. no current buffer\n"));
 103                 return;
 104         }
 105
 106         q->curr->vb.state = state;
 107         do_gettimeofday(&q->curr->vb.ts);
 108         wake_up(&q->curr->vb.done);
 109
 110         q->curr = NULL;
 111 }
 112
 113 void saa7146_buffer_next(struct saa7146_dev *dev,
 114                          struct saa7146_dmaqueue *q, int vbi)
 115 {
 116         struct saa7146_buf *buf,*next = NULL;
 117
 118         BUG_ON(!q);
 119
 120         DEB_INT(("dev:%p, dmaq:%p, vbi:%d\n", dev, q, vbi));
 121
 122         assert_spin_locked(&dev->slock);
 123         if (!list_empty(&q->queue)) {
 124                 /* activate next one from queue */
 125                 buf = list_entry(q->queue.next,struct saa7146_buf,vb.queue);
 126                 list_del(&buf->vb.queue);
 127                 if (!list_empty(&q->queue))
 128                         next = list_entry(q->queue.next,struct saa7146_buf, vb.queue);
 129                 q->curr = buf;
 130                 DEB_INT(("next buffer: buf:%p, prev:%p, next:%p\n", buf, q->queue.prev,q->queue.next));
 131                 buf->activate(dev,buf,next);
 132         } else {
 133                 DEB_INT(("no next buffer. stopping.\n"));
 134                 if( 0 != vbi ) {
 135                         /* turn off video-dma3 */
 136                         saa7146_write(dev,MC1, MASK_20);
 137                 } else {
 138                         /* nothing to do -- just prevent next video-dma1 transfer
 139                            by lowering the protection address */
 140
 141
 142                         saa7146_write(dev, PROT_ADDR1, 0);
 143                         saa7146_write(dev, MC2, (MASK_02|MASK_18));
 144
 145                         /* write the address of the rps-program */
 146                         saa7146_write(dev, RPS_ADDR0, dev->d_rps0.dma_handle);
 147                         /* turn on rps */
 148                         saa7146_write(dev, MC1, (MASK_12 | MASK_28));
 149
 150 /*
 151                         printk("vdma%d.base_even:     0x%08x\n", 1,saa7146_read(dev,BASE_EVEN1));
 152                         printk("vdma%d.base_odd:      0x%08x\n", 1,saa7146_read(dev,BASE_ODD1));
 153                         printk("vdma%d.prot_addr:     0x%08x\n", 1,saa7146_read(dev,PROT_ADDR1));
 154                         printk("vdma%d.base_page:     0x%08x\n", 1,saa7146_read(dev,BASE_PAGE1));
 155                         printk("vdma%d.pitch:         0x%08x\n", 1,saa7146_read(dev,PITCH1));
 156                         printk("vdma%d.num_line_byte: 0x%08x\n", 1,saa7146_read(dev,NUM_LINE_BYTE1));
 157 */
 158                 }
 159                 del_timer(&q->timeout);
 160         }
 161 }
 162
 163 void saa7146_buffer_timeout(unsigned long data)
 164 {
 165         struct saa7146_dmaqueue *q = (struct saa7146_dmaqueue*)data;
 166         struct saa7146_dev *dev = q->dev;
 167         unsigned long flags;
 168
 169         DEB_EE(("dev:%p, dmaq:%p\n", dev, q));
 170
 171         spin_lock_irqsave(&dev->slock,flags);
 172         if (q->curr) {
 173                 DEB_D(("timeout on %p\n", q->curr));
 174                 saa7146_buffer_finish(dev,q,VIDEOBUF_ERROR);
 175         }
 176
 177         /* we don't restart the transfer here like other drivers do. when
 178            a streaming capture is disabled, the timeout function will be
 179            called for the current buffer. if we activate the next buffer now,
 180            we mess up our capture logic. if a timeout occurs on another buffer,
 181            then something is seriously broken before, so no need to buffer the
 182            next capture IMHO... */
 183 /*
 184         saa7146_buffer_next(dev,q);
 185 */
 186         spin_unlock_irqrestore(&dev->slock,flags);
 187 }
 188
 189 /********************************************************************************/
 190 /* file operations */
 191
 192 static int fops_open(struct file *file)
 193 {
 194         struct video_device *vdev = video_devdata(file);
 195         struct saa7146_dev *dev = video_drvdata(file);
 196         struct saa7146_fh *fh = NULL;
 197         int result = 0;
 198
 199         enum v4l2_buf_type type;
 200
 201         DEB_EE(("file:%p, dev:%s\n", file, video_device_node_name(vdev)));
 202
 203         if (mutex_lock_interruptible(&saa7146_devices_lock))
 204                 return -ERESTARTSYS;
 205
 206         DEB_D(("using: %p\n",dev));
 207
 208         type = vdev->vfl_type == VFL_TYPE_GRABBER
 209              ? V4L2_BUF_TYPE_VIDEO_CAPTURE
 210              : V4L2_BUF_TYPE_VBI_CAPTURE;
 211
 212         /* check if an extension is registered */
 213         if( NULL == dev->ext ) {
 214                 DEB_S(("no extension registered for this device.\n"));
 215                 result = -ENODEV;
 216                 goto out;
 217         }
 218
 219         /* allocate per open data */
 220         fh = kzalloc(sizeof(*fh),GFP_KERNEL);
 221         if (NULL == fh) {
 222                 DEB_S(("cannot allocate memory for per open data.\n"));
 223                 result = -ENOMEM;
 224                 goto out;
 225         }
 226
 227         file->private_data = fh;
 228         fh->dev = dev;
 229         fh->type = type;
 230
 231         if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 232                 DEB_S(("initializing vbi...\n"));
 233                 if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 234                         result = saa7146_vbi_uops.open(dev,file);
 235                 if (dev->ext_vv_data->vbi_fops.open)
 236                         dev->ext_vv_data->vbi_fops.open(file);
 237         } else {
 238                 DEB_S(("initializing video...\n"));
 239                 result = saa7146_video_uops.open(dev,file);
 240         }
 241
 242         if (0 != result) {
 243                 goto out;
 244         }
 245
 246         if( 0 == try_module_get(dev->ext->module)) {
 247                 result = -EINVAL;
 248                 goto out;
 249         }
 250
 251         result = 0;
 252 out:
 253         if (fh && result != 0) {
 254                 kfree(fh);
 255                 file->private_data = NULL;
 256         }
 257         mutex_unlock(&saa7146_devices_lock);
 258         return result;
 259 }
 260
 261 static int fops_release(struct file *file)
 262 {
 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( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 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         module_put(dev->ext->module);
 281         file->private_data = NULL;
 282         kfree(fh);
 283
 284         mutex_unlock(&saa7146_devices_lock);
 285
 286         return 0;
 287 }
 288
 289 static int fops_mmap(struct file *file, struct vm_area_struct * vma)
 290 {
 291         struct saa7146_fh *fh = file->private_data;
 292         struct videobuf_queue *q;
 293
 294         switch (fh->type) {
 295         case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 296                 DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, vma:%p\n",file, vma));
 297                 q = &fh->video_q;
 298                 break;
 299                 }
 300         case V4L2_BUF_TYPE_VBI_CAPTURE: {
 301                 DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, vma:%p\n",file, vma));
 302                 q = &fh->vbi_q;
 303                 break;
 304                 }
 305         default:
 306                 BUG();
 307                 return 0;
 308         }
 309
 310         return videobuf_mmap_mapper(q,vma);
 311 }
 312
 313 static unsigned int fops_poll(struct file *file, struct poll_table_struct *wait)
 314 {
 315         struct saa7146_fh *fh = file->private_data;
 316         struct videobuf_buffer *buf = NULL;
 317         struct videobuf_queue *q;
 318
 319         DEB_EE(("file:%p, poll:%p\n",file, wait));
 320
 321         if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) {
 322                 if( 0 == fh->vbi_q.streaming )
 323                         return videobuf_poll_stream(file, &fh->vbi_q, wait);
 324                 q = &fh->vbi_q;
 325         } else {
 326                 DEB_D(("using video queue.\n"));
 327                 q = &fh->video_q;
 328         }
 329
 330         if (!list_empty(&q->stream))
 331                 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
 332
 333         if (!buf) {
 334                 DEB_D(("buf == NULL!\n"));
 335                 return POLLERR;
 336         }
 337
 338         poll_wait(file, &buf->done, wait);
 339         if (buf->state == VIDEOBUF_DONE || buf->state == VIDEOBUF_ERROR) {
 340                 DEB_D(("poll succeeded!\n"));
 341                 return POLLIN|POLLRDNORM;
 342         }
 343
 344         DEB_D(("nothing to poll for, buf->state:%d\n",buf->state));
 345         return 0;
 346 }
 347
 348 static ssize_t fops_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 349 {
 350         struct saa7146_fh *fh = file->private_data;
 351
 352         switch (fh->type) {
 353         case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 354 //              DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, data:%p, count:%lun", file, data, (unsigned long)count));
 355                 return saa7146_video_uops.read(file,data,count,ppos);
 356                 }
 357         case V4L2_BUF_TYPE_VBI_CAPTURE: {
 358 //              DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, data:%p, count:%lu\n", file, data, (unsigned long)count));
 359                 if (fh->dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 360                         return saa7146_vbi_uops.read(file,data,count,ppos);
 361                 else
 362                         return -EINVAL;
 363                 }
 364                 break;
 365         default:
 366                 BUG();
 367                 return 0;
 368         }
 369 }
 370
 371 static ssize_t fops_write(struct file *file, const char __user *data, size_t count, loff_t *ppos)
 372 {
 373         struct saa7146_fh *fh = file->private_data;
 374
 375         switch (fh->type) {
 376         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 377                 return -EINVAL;
 378         case V4L2_BUF_TYPE_VBI_CAPTURE:
 379                 if (fh->dev->ext_vv_data->vbi_fops.write)
 380                         return fh->dev->ext_vv_data->vbi_fops.write(file, data, count, ppos);
 381                 else
 382                         return -EINVAL;
 383         default:
 384                 BUG();
 385                 return -EINVAL;
 386         }
 387 }
 388
 389 static const struct v4l2_file_operations video_fops =
 390 {
 391         .owner          = THIS_MODULE,
 392         .open           = fops_open,
 393         .release        = fops_release,
 394         .read           = fops_read,
 395         .write          = fops_write,
 396         .poll           = fops_poll,
 397         .mmap           = fops_mmap,
 398         .ioctl          = video_ioctl2,
 399 };
 400
 401 static void vv_callback(struct saa7146_dev *dev, unsigned long status)
 402 {
 403         u32 isr = status;
 404
 405         DEB_INT(("dev:%p, isr:0x%08x\n",dev,(u32)status));
 406
 407         if (0 != (isr & (MASK_27))) {
 408                 DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
 409                 saa7146_video_uops.irq_done(dev,isr);
 410         }
 411
 412         if (0 != (isr & (MASK_28))) {
 413                 u32 mc2 = saa7146_read(dev, MC2);
 414                 if( 0 != (mc2 & MASK_15)) {
 415                         DEB_INT(("irq: RPS1 vbi workaround (0x%08x).\n",isr));
 416                         wake_up(&dev->vv_data->vbi_wq);
 417                         saa7146_write(dev,MC2, MASK_31);
 418                         return;
 419                 }
 420                 DEB_INT(("irq: RPS1 (0x%08x).\n",isr));
 421                 saa7146_vbi_uops.irq_done(dev,isr);
 422         }
 423 }
 424
 425 int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
 426 {
 427         struct saa7146_vv *vv;
 428         int err;
 429
 430         err = v4l2_device_register(&dev->pci->dev, &dev->v4l2_dev);
 431         if (err)
 432                 return err;
 433
 434         vv = kzalloc(sizeof(struct saa7146_vv), GFP_KERNEL);
 435         if (vv == NULL) {
 436                 ERR(("out of memory. aborting.\n"));
 437                 return -ENOMEM;
 438         }
 439         ext_vv->ops = saa7146_video_ioctl_ops;
 440         ext_vv->core_ops = &saa7146_video_ioctl_ops;
 441
 442         DEB_EE(("dev:%p\n",dev));
 443
 444         /* set default values for video parts of the saa7146 */
 445         saa7146_write(dev, BCS_CTRL, 0x80400040);
 446
 447         /* enable video-port pins */
 448         saa7146_write(dev, MC1, (MASK_10 | MASK_26));
 449
 450         /* save per-device extension data (one extension can
 451            handle different devices that might need different
 452            configuration data) */
 453         dev->ext_vv_data = ext_vv;
 454
 455         vv->d_clipping.cpu_addr = pci_alloc_consistent(dev->pci, SAA7146_CLIPPING_MEM, &vv->d_clipping.dma_handle);
 456         if( NULL == vv->d_clipping.cpu_addr ) {
 457                 ERR(("out of memory. aborting.\n"));
 458                 kfree(vv);
 459                 return -1;
 460         }
 461         memset(vv->d_clipping.cpu_addr, 0x0, SAA7146_CLIPPING_MEM);
 462
 463         saa7146_video_uops.init(dev,vv);
 464         if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 465                 saa7146_vbi_uops.init(dev,vv);
 466
 467         dev->vv_data = vv;
 468         dev->vv_callback = &vv_callback;
 469
 470         return 0;
 471 }
 472 EXPORT_SYMBOL_GPL(saa7146_vv_init);
 473
 474 int saa7146_vv_release(struct saa7146_dev* dev)
 475 {
 476         struct saa7146_vv *vv = dev->vv_data;
 477
 478         DEB_EE(("dev:%p\n",dev));
 479
 480         v4l2_device_unregister(&dev->v4l2_dev);
 481         pci_free_consistent(dev->pci, SAA7146_CLIPPING_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
 482         kfree(vv);
 483         dev->vv_data = NULL;
 484         dev->vv_callback = NULL;
 485
 486         return 0;
 487 }
 488 EXPORT_SYMBOL_GPL(saa7146_vv_release);
 489
 490 int saa7146_register_device(struct video_device **vid, struct saa7146_dev* dev,
 491                             char *name, int type)
 492 {
 493         struct video_device *vfd;
 494         int err;
 495         int i;
 496
 497         DEB_EE(("dev:%p, name:'%s', type:%d\n",dev,name,type));
 498
 499         // released by vfd->release
 500         vfd = video_device_alloc();
 501         if (vfd == NULL)
 502                 return -ENOMEM;
 503
 504         vfd->fops = &video_fops;
 505         vfd->ioctl_ops = &dev->ext_vv_data->ops;
 506         vfd->release = video_device_release;
 507         vfd->tvnorms = 0;
 508         for (i = 0; i < dev->ext_vv_data->num_stds; i++)
 509                 vfd->tvnorms |= dev->ext_vv_data->stds[i].id;
 510         strlcpy(vfd->name, name, sizeof(vfd->name));
 511         video_set_drvdata(vfd, dev);
 512
 513         err = video_register_device(vfd, type, -1);
 514         if (err < 0) {
 515                 ERR(("cannot register v4l2 device. skipping.\n"));
 516                 video_device_release(vfd);
 517                 return err;
 518         }
 519
 520         INFO(("%s: registered device %s [v4l2]\n",
 521                 dev->name, video_device_node_name(vfd)));
 522
 523         *vid = vfd;
 524         return 0;
 525 }
 526 EXPORT_SYMBOL_GPL(saa7146_register_device);
 527
 528 int saa7146_unregister_device(struct video_device **vid, struct saa7146_dev* dev)
 529 {
 530         DEB_EE(("dev:%p\n",dev));
 531
 532         video_unregister_device(*vid);
 533         *vid = NULL;
 534
 535         return 0;
 536 }
 537 EXPORT_SYMBOL_GPL(saa7146_unregister_device);
 538
 539 static int __init saa7146_vv_init_module(void)
 540 {
 541         return 0;
 542 }
 543
 544
 545 static void __exit saa7146_vv_cleanup_module(void)
 546 {
 547 }
 548
 549 module_init(saa7146_vv_init_module);
 550 module_exit(saa7146_vv_cleanup_module);
 551
 552 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 553 MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
 554 MODULE_LICENSE("GPL");