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(q, &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                         // fixme: fix this for vflip != 0
 142
 143                         saa7146_write(dev, PROT_ADDR1, 0);
 144                         saa7146_write(dev, MC2, (MASK_02|MASK_18));
 145
 146                         /* write the address of the rps-program */
 147                         saa7146_write(dev, RPS_ADDR0, dev->d_rps0.dma_handle);
 148                         /* turn on rps */
 149                         saa7146_write(dev, MC1, (MASK_12 | MASK_28));
 150
 151 /*
 152                         printk("vdma%d.base_even:     0x%08x\n", 1,saa7146_read(dev,BASE_EVEN1));
 153                         printk("vdma%d.base_odd:      0x%08x\n", 1,saa7146_read(dev,BASE_ODD1));
 154                         printk("vdma%d.prot_addr:     0x%08x\n", 1,saa7146_read(dev,PROT_ADDR1));
 155                         printk("vdma%d.base_page:     0x%08x\n", 1,saa7146_read(dev,BASE_PAGE1));
 156                         printk("vdma%d.pitch:         0x%08x\n", 1,saa7146_read(dev,PITCH1));
 157                         printk("vdma%d.num_line_byte: 0x%08x\n", 1,saa7146_read(dev,NUM_LINE_BYTE1));
 158 */
 159                 }
 160                 del_timer(&q->timeout);
 161         }
 162 }
 163
 164 void saa7146_buffer_timeout(unsigned long data)
 165 {
 166         struct saa7146_dmaqueue *q = (struct saa7146_dmaqueue*)data;
 167         struct saa7146_dev *dev = q->dev;
 168         unsigned long flags;
 169
 170         DEB_EE(("dev:%p, dmaq:%p\n", dev, q));
 171
 172         spin_lock_irqsave(&dev->slock,flags);
 173         if (q->curr) {
 174                 DEB_D(("timeout on %p\n", q->curr));
 175                 saa7146_buffer_finish(dev,q,VIDEOBUF_ERROR);
 176         }
 177
 178         /* we don't restart the transfer here like other drivers do. when
 179            a streaming capture is disabled, the timeout function will be
 180            called for the current buffer. if we activate the next buffer now,
 181            we mess up our capture logic. if a timeout occurs on another buffer,
 182            then something is seriously broken before, so no need to buffer the
 183            next capture IMHO... */
 184 /*
 185         saa7146_buffer_next(dev,q);
 186 */
 187         spin_unlock_irqrestore(&dev->slock,flags);
 188 }
 189
 190 /********************************************************************************/
 191 /* file operations */
 192
 193 static int fops_open(struct file *file)
 194 {
 195         struct video_device *vdev = video_devdata(file);
 196         struct saa7146_dev *dev = video_drvdata(file);
 197         struct saa7146_fh *fh = NULL;
 198         int result = 0;
 199
 200         enum v4l2_buf_type type;
 201
 202         DEB_EE(("file:%p, dev:%s\n", file, video_device_node_name(vdev)));
 203
 204         if (mutex_lock_interruptible(&saa7146_devices_lock))
 205                 return -ERESTARTSYS;
 206
 207         DEB_D(("using: %p\n",dev));
 208
 209         type = vdev->vfl_type == VFL_TYPE_GRABBER
 210              ? V4L2_BUF_TYPE_VIDEO_CAPTURE
 211              : V4L2_BUF_TYPE_VBI_CAPTURE;
 212
 213         /* check if an extension is registered */
 214         if( NULL == dev->ext ) {
 215                 DEB_S(("no extension registered for this device.\n"));
 216                 result = -ENODEV;
 217                 goto out;
 218         }
 219
 220         /* allocate per open data */
 221         fh = kzalloc(sizeof(*fh),GFP_KERNEL);
 222         if (NULL == fh) {
 223                 DEB_S(("cannot allocate memory for per open data.\n"));
 224                 result = -ENOMEM;
 225                 goto out;
 226         }
 227
 228         file->private_data = fh;
 229         fh->dev = dev;
 230         fh->type = type;
 231
 232         if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 233                 DEB_S(("initializing vbi...\n"));
 234                 if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 235                         result = saa7146_vbi_uops.open(dev,file);
 236                 if (dev->ext_vv_data->vbi_fops.open)
 237                         dev->ext_vv_data->vbi_fops.open(file);
 238         } else {
 239                 DEB_S(("initializing video...\n"));
 240                 result = saa7146_video_uops.open(dev,file);
 241         }
 242
 243         if (0 != result) {
 244                 goto out;
 245         }
 246
 247         if( 0 == try_module_get(dev->ext->module)) {
 248                 result = -EINVAL;
 249                 goto out;
 250         }
 251
 252         result = 0;
 253 out:
 254         if (fh && result != 0) {
 255                 kfree(fh);
 256                 file->private_data = NULL;
 257         }
 258         mutex_unlock(&saa7146_devices_lock);
 259         return result;
 260 }
 261
 262 static int fops_release(struct file *file)
 263 {
 264         struct saa7146_fh  *fh  = file->private_data;
 265         struct saa7146_dev *dev = fh->dev;
 266
 267         DEB_EE(("file:%p\n", file));
 268
 269         if (mutex_lock_interruptible(&saa7146_devices_lock))
 270                 return -ERESTARTSYS;
 271
 272         if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 273                 if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 274                         saa7146_vbi_uops.release(dev,file);
 275                 if (dev->ext_vv_data->vbi_fops.release)
 276                         dev->ext_vv_data->vbi_fops.release(file);
 277         } else {
 278                 saa7146_video_uops.release(dev,file);
 279         }
 280
 281         module_put(dev->ext->module);
 282         file->private_data = NULL;
 283         kfree(fh);
 284
 285         mutex_unlock(&saa7146_devices_lock);
 286
 287         return 0;
 288 }
 289
 290 static int fops_mmap(struct file *file, struct vm_area_struct * vma)
 291 {
 292         struct saa7146_fh *fh = file->private_data;
 293         struct videobuf_queue *q;
 294
 295         switch (fh->type) {
 296         case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 297                 DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, vma:%p\n",file, vma));
 298                 q = &fh->video_q;
 299                 break;
 300                 }
 301         case V4L2_BUF_TYPE_VBI_CAPTURE: {
 302                 DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, vma:%p\n",file, vma));
 303                 q = &fh->vbi_q;
 304                 break;
 305                 }
 306         default:
 307                 BUG();
 308                 return 0;
 309         }
 310
 311         return videobuf_mmap_mapper(q,vma);
 312 }
 313
 314 static unsigned int fops_poll(struct file *file, struct poll_table_struct *wait)
 315 {
 316         struct saa7146_fh *fh = file->private_data;
 317         struct videobuf_buffer *buf = NULL;
 318         struct videobuf_queue *q;
 319
 320         DEB_EE(("file:%p, poll:%p\n",file, wait));
 321
 322         if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) {
 323                 if( 0 == fh->vbi_q.streaming )
 324                         return videobuf_poll_stream(file, &fh->vbi_q, wait);
 325                 q = &fh->vbi_q;
 326         } else {
 327                 DEB_D(("using video queue.\n"));
 328                 q = &fh->video_q;
 329         }
 330
 331         if (!list_empty(&q->stream))
 332                 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
 333
 334         if (!buf) {
 335                 DEB_D(("buf == NULL!\n"));
 336                 return POLLERR;
 337         }
 338
 339         poll_wait(file, &buf->done, wait);
 340         if (buf->state == VIDEOBUF_DONE || buf->state == VIDEOBUF_ERROR) {
 341                 DEB_D(("poll succeeded!\n"));
 342                 return POLLIN|POLLRDNORM;
 343         }
 344
 345         DEB_D(("nothing to poll for, buf->state:%d\n",buf->state));
 346         return 0;
 347 }
 348
 349 static ssize_t fops_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 350 {
 351         struct saa7146_fh *fh = file->private_data;
 352
 353         switch (fh->type) {
 354         case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 355 //              DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, data:%p, count:%lun", file, data, (unsigned long)count));
 356                 return saa7146_video_uops.read(file,data,count,ppos);
 357                 }
 358         case V4L2_BUF_TYPE_VBI_CAPTURE: {
 359 //              DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, data:%p, count:%lu\n", file, data, (unsigned long)count));
 360                 if (fh->dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 361                         return saa7146_vbi_uops.read(file,data,count,ppos);
 362                 else
 363                         return -EINVAL;
 364                 }
 365                 break;
 366         default:
 367                 BUG();
 368                 return 0;
 369         }
 370 }
 371
 372 static ssize_t fops_write(struct file *file, const char __user *data, size_t count, loff_t *ppos)
 373 {
 374         struct saa7146_fh *fh = file->private_data;
 375
 376         switch (fh->type) {
 377         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 378                 return -EINVAL;
 379         case V4L2_BUF_TYPE_VBI_CAPTURE:
 380                 if (fh->dev->ext_vv_data->vbi_fops.write)
 381                         return fh->dev->ext_vv_data->vbi_fops.write(file, data, count, ppos);
 382                 else
 383                         return -EINVAL;
 384         default:
 385                 BUG();
 386                 return -EINVAL;
 387         }
 388 }
 389
 390 static const struct v4l2_file_operations video_fops =
 391 {
 392         .owner          = THIS_MODULE,
 393         .open           = fops_open,
 394         .release        = fops_release,
 395         .read           = fops_read,
 396         .write          = fops_write,
 397         .poll           = fops_poll,
 398         .mmap           = fops_mmap,
 399         .ioctl          = video_ioctl2,
 400 };
 401
 402 static void vv_callback(struct saa7146_dev *dev, unsigned long status)
 403 {
 404         u32 isr = status;
 405
 406         DEB_INT(("dev:%p, isr:0x%08x\n",dev,(u32)status));
 407
 408         if (0 != (isr & (MASK_27))) {
 409                 DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
 410                 saa7146_video_uops.irq_done(dev,isr);
 411         }
 412
 413         if (0 != (isr & (MASK_28))) {
 414                 u32 mc2 = saa7146_read(dev, MC2);
 415                 if( 0 != (mc2 & MASK_15)) {
 416                         DEB_INT(("irq: RPS1 vbi workaround (0x%08x).\n",isr));
 417                         wake_up(&dev->vv_data->vbi_wq);
 418                         saa7146_write(dev,MC2, MASK_31);
 419                         return;
 420                 }
 421                 DEB_INT(("irq: RPS1 (0x%08x).\n",isr));
 422                 saa7146_vbi_uops.irq_done(dev,isr);
 423         }
 424 }
 425
 426 int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
 427 {
 428         struct saa7146_vv *vv;
 429         int err;
 430
 431         err = v4l2_device_register(&dev->pci->dev, &dev->v4l2_dev);
 432         if (err)
 433                 return err;
 434
 435         vv = kzalloc(sizeof(struct saa7146_vv), GFP_KERNEL);
 436         if (vv == NULL) {
 437                 ERR(("out of memory. aborting.\n"));
 438                 return -ENOMEM;
 439         }
 440         ext_vv->ops = saa7146_video_ioctl_ops;
 441         ext_vv->core_ops = &saa7146_video_ioctl_ops;
 442
 443         DEB_EE(("dev:%p\n",dev));
 444
 445         /* set default values for video parts of the saa7146 */
 446         saa7146_write(dev, BCS_CTRL, 0x80400040);
 447
 448         /* enable video-port pins */
 449         saa7146_write(dev, MC1, (MASK_10 | MASK_26));
 450
 451         /* save per-device extension data (one extension can
 452            handle different devices that might need different
 453            configuration data) */
 454         dev->ext_vv_data = ext_vv;
 455
 456         vv->d_clipping.cpu_addr = pci_alloc_consistent(dev->pci, SAA7146_CLIPPING_MEM, &vv->d_clipping.dma_handle);
 457         if( NULL == vv->d_clipping.cpu_addr ) {
 458                 ERR(("out of memory. aborting.\n"));
 459                 kfree(vv);
 460                 return -1;
 461         }
 462         memset(vv->d_clipping.cpu_addr, 0x0, SAA7146_CLIPPING_MEM);
 463
 464         saa7146_video_uops.init(dev,vv);
 465         if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 466                 saa7146_vbi_uops.init(dev,vv);
 467
 468         dev->vv_data = vv;
 469         dev->vv_callback = &vv_callback;
 470
 471         return 0;
 472 }
 473 EXPORT_SYMBOL_GPL(saa7146_vv_init);
 474
 475 int saa7146_vv_release(struct saa7146_dev* dev)
 476 {
 477         struct saa7146_vv *vv = dev->vv_data;
 478
 479         DEB_EE(("dev:%p\n",dev));
 480
 481         v4l2_device_unregister(&dev->v4l2_dev);
 482         pci_free_consistent(dev->pci, SAA7146_CLIPPING_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
 483         kfree(vv);
 484         dev->vv_data = NULL;
 485         dev->vv_callback = NULL;
 486
 487         return 0;
 488 }
 489 EXPORT_SYMBOL_GPL(saa7146_vv_release);
 490
 491 int saa7146_register_device(struct video_device **vid, struct saa7146_dev* dev,
 492                             char *name, int type)
 493 {
 494         struct video_device *vfd;
 495         int err;
 496         int i;
 497
 498         DEB_EE(("dev:%p, name:'%s', type:%d\n",dev,name,type));
 499
 500         // released by vfd->release
 501         vfd = video_device_alloc();
 502         if (vfd == NULL)
 503                 return -ENOMEM;
 504
 505         vfd->fops = &video_fops;
 506         vfd->ioctl_ops = &dev->ext_vv_data->ops;
 507         vfd->release = video_device_release;
 508         vfd->tvnorms = 0;
 509         for (i = 0; i < dev->ext_vv_data->num_stds; i++)
 510                 vfd->tvnorms |= dev->ext_vv_data->stds[i].id;
 511         strlcpy(vfd->name, name, sizeof(vfd->name));
 512         video_set_drvdata(vfd, dev);
 513
 514         err = video_register_device(vfd, type, -1);
 515         if (err < 0) {
 516                 ERR(("cannot register v4l2 device. skipping.\n"));
 517                 video_device_release(vfd);
 518                 return err;
 519         }
 520
 521         INFO(("%s: registered device %s [v4l2]\n",
 522                 dev->name, video_device_node_name(vfd)));
 523
 524         *vid = vfd;
 525         return 0;
 526 }
 527 EXPORT_SYMBOL_GPL(saa7146_register_device);
 528
 529 int saa7146_unregister_device(struct video_device **vid, struct saa7146_dev* dev)
 530 {
 531         DEB_EE(("dev:%p\n",dev));
 532
 533         video_unregister_device(*vid);
 534         *vid = NULL;
 535
 536         return 0;
 537 }
 538 EXPORT_SYMBOL_GPL(saa7146_unregister_device);
 539
 540 static int __init saa7146_vv_init_module(void)
 541 {
 542         return 0;
 543 }
 544
 545
 546 static void __exit saa7146_vv_cleanup_module(void)
 547 {
 548 }
 549
 550 module_init(saa7146_vv_init_module);
 551 module_exit(saa7146_vv_cleanup_module);
 552
 553 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 554 MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
 555 MODULE_LICENSE("GPL");