drivers/media/common/saa7146_fops.c

   1 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   2
   3 #include <media/saa7146_vv.h>
   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",
  15                       bit, vv->resources);
  16                 /* have it already allocated */
  17                 return 1;
  18         }
  19
  20         /* is it free? */
  21         if (vv->resources & bit) {
  22                 DEB_D("locked! vv->resources:0x%02x, we want:0x%02x\n",
  23                       vv->resources, bit);
  24                 /* no, someone else uses it */
  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         return 1;
  32 }
  33
  34 void saa7146_res_free(struct saa7146_fh *fh, unsigned int bits)
  35 {
  36         struct saa7146_dev *dev = fh->dev;
  37         struct saa7146_vv *vv = dev->vv_data;
  38
  39         BUG_ON((fh->resources & bits) != bits);
  40
  41         fh->resources &= ~bits;
  42         vv->resources &= ~bits;
  43         DEB_D("res: put 0x%02x, cur:0x%02x\n", bits, vv->resources);
  44 }
  45
  46
  47 /********************************************************************************/
  48 /* common dma functions */
  49
  50 void saa7146_dma_free(struct saa7146_dev *dev,struct videobuf_queue *q,
  51                                                 struct saa7146_buf *buf)
  52 {
  53         struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
  54         DEB_EE("dev:%p, buf:%p\n", dev, buf);
  55
  56         BUG_ON(in_interrupt());
  57
  58         videobuf_waiton(q, &buf->vb, 0, 0);
  59         videobuf_dma_unmap(q->dev, dma);
  60         videobuf_dma_free(dma);
  61         buf->vb.state = VIDEOBUF_NEEDS_INIT;
  62 }
  63
  64
  65 /********************************************************************************/
  66 /* common buffer functions */
  67
  68 int saa7146_buffer_queue(struct saa7146_dev *dev,
  69                          struct saa7146_dmaqueue *q,
  70                          struct saa7146_buf *buf)
  71 {
  72         assert_spin_locked(&dev->slock);
  73         DEB_EE("dev:%p, dmaq:%p, buf:%p\n", dev, q, buf);
  74
  75         BUG_ON(!q);
  76
  77         if (NULL == q->curr) {
  78                 q->curr = buf;
  79                 DEB_D("immediately activating buffer %p\n", buf);
  80                 buf->activate(dev,buf,NULL);
  81         } else {
  82                 list_add_tail(&buf->vb.queue,&q->queue);
  83                 buf->vb.state = VIDEOBUF_QUEUED;
  84                 DEB_D("adding buffer %p to queue. (active buffer present)\n",
  85                       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",
 131                         buf, q->queue.prev, q->queue.next);
 132                 buf->activate(dev,buf,next);
 133         } else {
 134                 DEB_INT("no next buffer. stopping.\n");
 135                 if( 0 != vbi ) {
 136                         /* turn off video-dma3 */
 137                         saa7146_write(dev,MC1, MASK_20);
 138                 } else {
 139                         /* nothing to do -- just prevent next video-dma1 transfer
 140                            by lowering the protection address */
 141
 142                         // fixme: fix this for vflip != 0
 143
 144                         saa7146_write(dev, PROT_ADDR1, 0);
 145                         saa7146_write(dev, MC2, (MASK_02|MASK_18));
 146
 147                         /* write the address of the rps-program */
 148                         saa7146_write(dev, RPS_ADDR0, dev->d_rps0.dma_handle);
 149                         /* turn on rps */
 150                         saa7146_write(dev, MC1, (MASK_12 | MASK_28));
 151
 152 /*
 153                         printk("vdma%d.base_even:     0x%08x\n", 1,saa7146_read(dev,BASE_EVEN1));
 154                         printk("vdma%d.base_odd:      0x%08x\n", 1,saa7146_read(dev,BASE_ODD1));
 155                         printk("vdma%d.prot_addr:     0x%08x\n", 1,saa7146_read(dev,PROT_ADDR1));
 156                         printk("vdma%d.base_page:     0x%08x\n", 1,saa7146_read(dev,BASE_PAGE1));
 157                         printk("vdma%d.pitch:         0x%08x\n", 1,saa7146_read(dev,PITCH1));
 158                         printk("vdma%d.num_line_byte: 0x%08x\n", 1,saa7146_read(dev,NUM_LINE_BYTE1));
 159 */
 160                 }
 161                 del_timer(&q->timeout);
 162         }
 163 }
 164
 165 void saa7146_buffer_timeout(unsigned long data)
 166 {
 167         struct saa7146_dmaqueue *q = (struct saa7146_dmaqueue*)data;
 168         struct saa7146_dev *dev = q->dev;
 169         unsigned long flags;
 170
 171         DEB_EE("dev:%p, dmaq:%p\n", dev, q);
 172
 173         spin_lock_irqsave(&dev->slock,flags);
 174         if (q->curr) {
 175                 DEB_D("timeout on %p\n", q->curr);
 176                 saa7146_buffer_finish(dev,q,VIDEOBUF_ERROR);
 177         }
 178
 179         /* we don't restart the transfer here like other drivers do. when
 180            a streaming capture is disabled, the timeout function will be
 181            called for the current buffer. if we activate the next buffer now,
 182            we mess up our capture logic. if a timeout occurs on another buffer,
 183            then something is seriously broken before, so no need to buffer the
 184            next capture IMHO... */
 185 /*
 186         saa7146_buffer_next(dev,q);
 187 */
 188         spin_unlock_irqrestore(&dev->slock,flags);
 189 }
 190
 191 /********************************************************************************/
 192 /* file operations */
 193
 194 static int fops_open(struct file *file)
 195 {
 196         struct video_device *vdev = video_devdata(file);
 197         struct saa7146_dev *dev = video_drvdata(file);
 198         struct saa7146_fh *fh = NULL;
 199         int result = 0;
 200
 201         enum v4l2_buf_type type;
 202
 203         DEB_EE("file:%p, dev:%s\n", file, video_device_node_name(vdev));
 204
 205         if (mutex_lock_interruptible(&saa7146_devices_lock))
 206                 return -ERESTARTSYS;
 207
 208         DEB_D("using: %p\n", dev);
 209
 210         type = vdev->vfl_type == VFL_TYPE_GRABBER
 211              ? V4L2_BUF_TYPE_VIDEO_CAPTURE
 212              : V4L2_BUF_TYPE_VBI_CAPTURE;
 213
 214         /* check if an extension is registered */
 215         if( NULL == dev->ext ) {
 216                 DEB_S("no extension registered for this device\n");
 217                 result = -ENODEV;
 218                 goto out;
 219         }
 220
 221         /* allocate per open data */
 222         fh = kzalloc(sizeof(*fh),GFP_KERNEL);
 223         if (NULL == fh) {
 224                 DEB_S("cannot allocate memory for per open data\n");
 225                 result = -ENOMEM;
 226                 goto out;
 227         }
 228
 229         file->private_data = fh;
 230         fh->dev = dev;
 231         fh->type = type;
 232
 233         if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 234                 DEB_S("initializing vbi...\n");
 235                 if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 236                         result = saa7146_vbi_uops.open(dev,file);
 237                 if (dev->ext_vv_data->vbi_fops.open)
 238                         dev->ext_vv_data->vbi_fops.open(file);
 239         } else {
 240                 DEB_S("initializing video...\n");
 241                 result = saa7146_video_uops.open(dev,file);
 242         }
 243
 244         if (0 != result) {
 245                 goto out;
 246         }
 247
 248         if( 0 == try_module_get(dev->ext->module)) {
 249                 result = -EINVAL;
 250                 goto out;
 251         }
 252
 253         result = 0;
 254 out:
 255         if (fh && result != 0) {
 256                 kfree(fh);
 257                 file->private_data = NULL;
 258         }
 259         mutex_unlock(&saa7146_devices_lock);
 260         return result;
 261 }
 262
 263 static int fops_release(struct file *file)
 264 {
 265         struct saa7146_fh  *fh  = file->private_data;
 266         struct saa7146_dev *dev = fh->dev;
 267
 268         DEB_EE("file:%p\n", file);
 269
 270         if (mutex_lock_interruptible(&saa7146_devices_lock))
 271                 return -ERESTARTSYS;
 272
 273         if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 274                 if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 275                         saa7146_vbi_uops.release(dev,file);
 276                 if (dev->ext_vv_data->vbi_fops.release)
 277                         dev->ext_vv_data->vbi_fops.release(file);
 278         } else {
 279                 saa7146_video_uops.release(dev,file);
 280         }
 281
 282         module_put(dev->ext->module);
 283         file->private_data = NULL;
 284         kfree(fh);
 285
 286         mutex_unlock(&saa7146_devices_lock);
 287
 288         return 0;
 289 }
 290
 291 static int fops_mmap(struct file *file, struct vm_area_struct * vma)
 292 {
 293         struct saa7146_fh *fh = file->private_data;
 294         struct videobuf_queue *q;
 295
 296         switch (fh->type) {
 297         case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 298                 DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, vma:%p\n",
 299                        file, vma);
 300                 q = &fh->video_q;
 301                 break;
 302                 }
 303         case V4L2_BUF_TYPE_VBI_CAPTURE: {
 304                 DEB_EE("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, vma:%p\n",
 305                        file, vma);
 306                 q = &fh->vbi_q;
 307                 break;
 308                 }
 309         default:
 310                 BUG();
 311                 return 0;
 312         }
 313
 314         return videobuf_mmap_mapper(q,vma);
 315 }
 316
 317 static unsigned int fops_poll(struct file *file, struct poll_table_struct *wait)
 318 {
 319         struct saa7146_fh *fh = file->private_data;
 320         struct videobuf_buffer *buf = NULL;
 321         struct videobuf_queue *q;
 322
 323         DEB_EE("file:%p, poll:%p\n", file, wait);
 324
 325         if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) {
 326                 if( 0 == fh->vbi_q.streaming )
 327                         return videobuf_poll_stream(file, &fh->vbi_q, wait);
 328                 q = &fh->vbi_q;
 329         } else {
 330                 DEB_D("using video queue\n");
 331                 q = &fh->video_q;
 332         }
 333
 334         if (!list_empty(&q->stream))
 335                 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
 336
 337         if (!buf) {
 338                 DEB_D("buf == NULL!\n");
 339                 return POLLERR;
 340         }
 341
 342         poll_wait(file, &buf->done, wait);
 343         if (buf->state == VIDEOBUF_DONE || buf->state == VIDEOBUF_ERROR) {
 344                 DEB_D("poll succeeded!\n");
 345                 return POLLIN|POLLRDNORM;
 346         }
 347
 348         DEB_D("nothing to poll for, buf->state:%d\n", buf->state);
 349         return 0;
 350 }
 351
 352 static ssize_t fops_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 353 {
 354         struct saa7146_fh *fh = file->private_data;
 355
 356         switch (fh->type) {
 357         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 358 /*
 359                 DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, data:%p, count:%lun",
 360                        file, data, (unsigned long)count);
 361 */
 362                 return saa7146_video_uops.read(file,data,count,ppos);
 363         case V4L2_BUF_TYPE_VBI_CAPTURE:
 364 /*
 365                 DEB_EE("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, data:%p, count:%lu\n",
 366                        file, data, (unsigned long)count);
 367 */
 368                 if (fh->dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 369                         return saa7146_vbi_uops.read(file,data,count,ppos);
 370                 return -EINVAL;
 371         default:
 372                 BUG();
 373                 return 0;
 374         }
 375 }
 376
 377 static ssize_t fops_write(struct file *file, const char __user *data, size_t count, loff_t *ppos)
 378 {
 379         struct saa7146_fh *fh = file->private_data;
 380
 381         switch (fh->type) {
 382         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 383                 return -EINVAL;
 384         case V4L2_BUF_TYPE_VBI_CAPTURE:
 385                 if (fh->dev->ext_vv_data->vbi_fops.write)
 386                         return fh->dev->ext_vv_data->vbi_fops.write(file, data, count, ppos);
 387                 else
 388                         return -EINVAL;
 389         default:
 390                 BUG();
 391                 return -EINVAL;
 392         }
 393 }
 394
 395 static const struct v4l2_file_operations video_fops =
 396 {
 397         .owner          = THIS_MODULE,
 398         .open           = fops_open,
 399         .release        = fops_release,
 400         .read           = fops_read,
 401         .write          = fops_write,
 402         .poll           = fops_poll,
 403         .mmap           = fops_mmap,
 404         .unlocked_ioctl = video_ioctl2,
 405 };
 406
 407 static void vv_callback(struct saa7146_dev *dev, unsigned long status)
 408 {
 409         u32 isr = status;
 410
 411         DEB_INT("dev:%p, isr:0x%08x\n", dev, (u32)status);
 412
 413         if (0 != (isr & (MASK_27))) {
 414                 DEB_INT("irq: RPS0 (0x%08x)\n", isr);
 415                 saa7146_video_uops.irq_done(dev,isr);
 416         }
 417
 418         if (0 != (isr & (MASK_28))) {
 419                 u32 mc2 = saa7146_read(dev, MC2);
 420                 if( 0 != (mc2 & MASK_15)) {
 421                         DEB_INT("irq: RPS1 vbi workaround (0x%08x)\n", isr);
 422                         wake_up(&dev->vv_data->vbi_wq);
 423                         saa7146_write(dev,MC2, MASK_31);
 424                         return;
 425                 }
 426                 DEB_INT("irq: RPS1 (0x%08x)\n", isr);
 427                 saa7146_vbi_uops.irq_done(dev,isr);
 428         }
 429 }
 430
 431 int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
 432 {
 433         struct saa7146_vv *vv;
 434         int err;
 435
 436         err = v4l2_device_register(&dev->pci->dev, &dev->v4l2_dev);
 437         if (err)
 438                 return err;
 439
 440         vv = kzalloc(sizeof(struct saa7146_vv), GFP_KERNEL);
 441         if (vv == NULL) {
 442                 ERR("out of memory. aborting.\n");
 443                 return -ENOMEM;
 444         }
 445         ext_vv->ops = saa7146_video_ioctl_ops;
 446         ext_vv->core_ops = &saa7146_video_ioctl_ops;
 447
 448         DEB_EE("dev:%p\n", dev);
 449
 450         /* set default values for video parts of the saa7146 */
 451         saa7146_write(dev, BCS_CTRL, 0x80400040);
 452
 453         /* enable video-port pins */
 454         saa7146_write(dev, MC1, (MASK_10 | MASK_26));
 455
 456         /* save per-device extension data (one extension can
 457            handle different devices that might need different
 458            configuration data) */
 459         dev->ext_vv_data = ext_vv;
 460
 461         vv->d_clipping.cpu_addr = pci_alloc_consistent(dev->pci, SAA7146_CLIPPING_MEM, &vv->d_clipping.dma_handle);
 462         if( NULL == vv->d_clipping.cpu_addr ) {
 463                 ERR("out of memory. aborting.\n");
 464                 kfree(vv);
 465                 return -1;
 466         }
 467         memset(vv->d_clipping.cpu_addr, 0x0, SAA7146_CLIPPING_MEM);
 468
 469         saa7146_video_uops.init(dev,vv);
 470         if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 471                 saa7146_vbi_uops.init(dev,vv);
 472
 473         dev->vv_data = vv;
 474         dev->vv_callback = &vv_callback;
 475
 476         return 0;
 477 }
 478 EXPORT_SYMBOL_GPL(saa7146_vv_init);
 479
 480 int saa7146_vv_release(struct saa7146_dev* dev)
 481 {
 482         struct saa7146_vv *vv = dev->vv_data;
 483
 484         DEB_EE("dev:%p\n", dev);
 485
 486         v4l2_device_unregister(&dev->v4l2_dev);
 487         pci_free_consistent(dev->pci, SAA7146_CLIPPING_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
 488         kfree(vv);
 489         dev->vv_data = NULL;
 490         dev->vv_callback = NULL;
 491
 492         return 0;
 493 }
 494 EXPORT_SYMBOL_GPL(saa7146_vv_release);
 495
 496 int saa7146_register_device(struct video_device **vid, struct saa7146_dev* dev,
 497                             char *name, int type)
 498 {
 499         struct video_device *vfd;
 500         int err;
 501         int i;
 502
 503         DEB_EE("dev:%p, name:'%s', type:%d\n", dev, name, type);
 504
 505         // released by vfd->release
 506         vfd = video_device_alloc();
 507         if (vfd == NULL)
 508                 return -ENOMEM;
 509
 510         vfd->fops = &video_fops;
 511         vfd->ioctl_ops = &dev->ext_vv_data->ops;
 512         vfd->release = video_device_release;
 513         vfd->lock = &dev->v4l2_lock;
 514         vfd->tvnorms = 0;
 515         for (i = 0; i < dev->ext_vv_data->num_stds; i++)
 516                 vfd->tvnorms |= dev->ext_vv_data->stds[i].id;
 517         strlcpy(vfd->name, name, sizeof(vfd->name));
 518         video_set_drvdata(vfd, dev);
 519
 520         err = video_register_device(vfd, type, -1);
 521         if (err < 0) {
 522                 ERR("cannot register v4l2 device. skipping.\n");
 523                 video_device_release(vfd);
 524                 return err;
 525         }
 526
 527         pr_info("%s: registered device %s [v4l2]\n",
 528                 dev->name, video_device_node_name(vfd));
 529
 530         *vid = vfd;
 531         return 0;
 532 }
 533 EXPORT_SYMBOL_GPL(saa7146_register_device);
 534
 535 int saa7146_unregister_device(struct video_device **vid, struct saa7146_dev* dev)
 536 {
 537         DEB_EE("dev:%p\n", dev);
 538
 539         video_unregister_device(*vid);
 540         *vid = NULL;
 541
 542         return 0;
 543 }
 544 EXPORT_SYMBOL_GPL(saa7146_unregister_device);
 545
 546 static int __init saa7146_vv_init_module(void)
 547 {
 548         return 0;
 549 }
 550
 551
 552 static void __exit saa7146_vv_cleanup_module(void)
 553 {
 554 }
 555
 556 module_init(saa7146_vv_init_module);
 557 module_exit(saa7146_vv_cleanup_module);
 558
 559 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 560 MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
 561 MODULE_LICENSE("GPL");