drivers/media/common/saa7146_fops.c

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