drivers/media/common/saa7146_fops.c

   1 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   2
   3 #include <media/saa7146_vv.h>
   4 #include <linux/module.h>
   5
   6 /****************************************************************************/
   7 /* resource management functions, shamelessly stolen from saa7134 driver */
   8
   9 int saa7146_res_get(struct saa7146_fh *fh, unsigned int bit)
  10 {
  11         struct saa7146_dev *dev = fh->dev;
  12         struct saa7146_vv *vv = dev->vv_data;
  13
  14         if (fh->resources & bit) {
  15                 DEB_D("already allocated! want: 0x%02x, cur:0x%02x\n",
  16                       bit, vv->resources);
  17                 /* have it already allocated */
  18                 return 1;
  19         }
  20
  21         /* is it free? */
  22         if (vv->resources & bit) {
  23                 DEB_D("locked! vv->resources:0x%02x, we want:0x%02x\n",
  24                       vv->resources, bit);
  25                 /* no, someone else uses it */
  26                 return 0;
  27         }
  28         /* it's free, grab it */
  29         fh->resources |= bit;
  30         vv->resources |= bit;
  31         DEB_D("res: get 0x%02x, cur:0x%02x\n", bit, vv->resources);
  32         return 1;
  33 }
  34
  35 void saa7146_res_free(struct saa7146_fh *fh, unsigned int bits)
  36 {
  37         struct saa7146_dev *dev = fh->dev;
  38         struct saa7146_vv *vv = dev->vv_data;
  39
  40         BUG_ON((fh->resources & bits) != bits);
  41
  42         fh->resources &= ~bits;
  43         vv->resources &= ~bits;
  44         DEB_D("res: put 0x%02x, cur:0x%02x\n", bits, vv->resources);
  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",
  86                       buf);
  87         }
  88         return 0;
  89 }
  90
  91 void saa7146_buffer_finish(struct saa7146_dev *dev,
  92                            struct saa7146_dmaqueue *q,
  93                            int state)
  94 {
  95         assert_spin_locked(&dev->slock);
  96         DEB_EE("dev:%p, dmaq:%p, state:%d\n", dev, q, state);
  97         DEB_EE("q->curr:%p\n", q->curr);
  98
  99         BUG_ON(!q->curr);
 100
 101         /* finish current buffer */
 102         if (NULL == q->curr) {
 103                 DEB_D("aiii. no current buffer\n");
 104                 return;
 105         }
 106
 107         q->curr->vb.state = state;
 108         do_gettimeofday(&q->curr->vb.ts);
 109         wake_up(&q->curr->vb.done);
 110
 111         q->curr = NULL;
 112 }
 113
 114 void saa7146_buffer_next(struct saa7146_dev *dev,
 115                          struct saa7146_dmaqueue *q, int vbi)
 116 {
 117         struct saa7146_buf *buf,*next = NULL;
 118
 119         BUG_ON(!q);
 120
 121         DEB_INT("dev:%p, dmaq:%p, vbi:%d\n", dev, q, vbi);
 122
 123         assert_spin_locked(&dev->slock);
 124         if (!list_empty(&q->queue)) {
 125                 /* activate next one from queue */
 126                 buf = list_entry(q->queue.next,struct saa7146_buf,vb.queue);
 127                 list_del(&buf->vb.queue);
 128                 if (!list_empty(&q->queue))
 129                         next = list_entry(q->queue.next,struct saa7146_buf, vb.queue);
 130                 q->curr = buf;
 131                 DEB_INT("next buffer: buf:%p, prev:%p, next:%p\n",
 132                         buf, q->queue.prev, q->queue.next);
 133                 buf->activate(dev,buf,next);
 134         } else {
 135                 DEB_INT("no next buffer. stopping.\n");
 136                 if( 0 != vbi ) {
 137                         /* turn off video-dma3 */
 138                         saa7146_write(dev,MC1, MASK_20);
 139                 } else {
 140                         /* nothing to do -- just prevent next video-dma1 transfer
 141                            by lowering the protection address */
 142
 143                         // fixme: fix this for vflip != 0
 144
 145                         saa7146_write(dev, PROT_ADDR1, 0);
 146                         saa7146_write(dev, MC2, (MASK_02|MASK_18));
 147
 148                         /* write the address of the rps-program */
 149                         saa7146_write(dev, RPS_ADDR0, dev->d_rps0.dma_handle);
 150                         /* turn on rps */
 151                         saa7146_write(dev, MC1, (MASK_12 | MASK_28));
 152
 153 /*
 154                         printk("vdma%d.base_even:     0x%08x\n", 1,saa7146_read(dev,BASE_EVEN1));
 155                         printk("vdma%d.base_odd:      0x%08x\n", 1,saa7146_read(dev,BASE_ODD1));
 156                         printk("vdma%d.prot_addr:     0x%08x\n", 1,saa7146_read(dev,PROT_ADDR1));
 157                         printk("vdma%d.base_page:     0x%08x\n", 1,saa7146_read(dev,BASE_PAGE1));
 158                         printk("vdma%d.pitch:         0x%08x\n", 1,saa7146_read(dev,PITCH1));
 159                         printk("vdma%d.num_line_byte: 0x%08x\n", 1,saa7146_read(dev,NUM_LINE_BYTE1));
 160 */
 161                 }
 162                 del_timer(&q->timeout);
 163         }
 164 }
 165
 166 void saa7146_buffer_timeout(unsigned long data)
 167 {
 168         struct saa7146_dmaqueue *q = (struct saa7146_dmaqueue*)data;
 169         struct saa7146_dev *dev = q->dev;
 170         unsigned long flags;
 171
 172         DEB_EE("dev:%p, dmaq:%p\n", dev, q);
 173
 174         spin_lock_irqsave(&dev->slock,flags);
 175         if (q->curr) {
 176                 DEB_D("timeout on %p\n", q->curr);
 177                 saa7146_buffer_finish(dev,q,VIDEOBUF_ERROR);
 178         }
 179
 180         /* we don't restart the transfer here like other drivers do. when
 181            a streaming capture is disabled, the timeout function will be
 182            called for the current buffer. if we activate the next buffer now,
 183            we mess up our capture logic. if a timeout occurs on another buffer,
 184            then something is seriously broken before, so no need to buffer the
 185            next capture IMHO... */
 186 /*
 187         saa7146_buffer_next(dev,q);
 188 */
 189         spin_unlock_irqrestore(&dev->slock,flags);
 190 }
 191
 192 /********************************************************************************/
 193 /* file operations */
 194
 195 static int fops_open(struct file *file)
 196 {
 197         struct video_device *vdev = video_devdata(file);
 198         struct saa7146_dev *dev = video_drvdata(file);
 199         struct saa7146_fh *fh = NULL;
 200         int result = 0;
 201
 202         enum v4l2_buf_type type;
 203
 204         DEB_EE("file:%p, dev:%s\n", file, video_device_node_name(vdev));
 205
 206         if (mutex_lock_interruptible(&saa7146_devices_lock))
 207                 return -ERESTARTSYS;
 208
 209         DEB_D("using: %p\n", dev);
 210
 211         type = vdev->vfl_type == VFL_TYPE_GRABBER
 212              ? V4L2_BUF_TYPE_VIDEO_CAPTURE
 213              : V4L2_BUF_TYPE_VBI_CAPTURE;
 214
 215         /* check if an extension is registered */
 216         if( NULL == dev->ext ) {
 217                 DEB_S("no extension registered for this device\n");
 218                 result = -ENODEV;
 219                 goto out;
 220         }
 221
 222         /* allocate per open data */
 223         fh = kzalloc(sizeof(*fh),GFP_KERNEL);
 224         if (NULL == fh) {
 225                 DEB_S("cannot allocate memory for per open data\n");
 226                 result = -ENOMEM;
 227                 goto out;
 228         }
 229
 230         file->private_data = fh;
 231         fh->dev = dev;
 232         fh->type = type;
 233
 234         if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 235                 DEB_S("initializing vbi...\n");
 236                 if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 237                         result = saa7146_vbi_uops.open(dev,file);
 238                 if (dev->ext_vv_data->vbi_fops.open)
 239                         dev->ext_vv_data->vbi_fops.open(file);
 240         } else {
 241                 DEB_S("initializing video...\n");
 242                 result = saa7146_video_uops.open(dev,file);
 243         }
 244
 245         if (0 != result) {
 246                 goto out;
 247         }
 248
 249         if( 0 == try_module_get(dev->ext->module)) {
 250                 result = -EINVAL;
 251                 goto out;
 252         }
 253
 254         result = 0;
 255 out:
 256         if (fh && result != 0) {
 257                 kfree(fh);
 258                 file->private_data = NULL;
 259         }
 260         mutex_unlock(&saa7146_devices_lock);
 261         return result;
 262 }
 263
 264 static int fops_release(struct file *file)
 265 {
 266         struct saa7146_fh  *fh  = file->private_data;
 267         struct saa7146_dev *dev = fh->dev;
 268
 269         DEB_EE("file:%p\n", file);
 270
 271         if (mutex_lock_interruptible(&saa7146_devices_lock))
 272                 return -ERESTARTSYS;
 273
 274         if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 275                 if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 276                         saa7146_vbi_uops.release(dev,file);
 277                 if (dev->ext_vv_data->vbi_fops.release)
 278                         dev->ext_vv_data->vbi_fops.release(file);
 279         } else {
 280                 saa7146_video_uops.release(dev,file);
 281         }
 282
 283         module_put(dev->ext->module);
 284         file->private_data = NULL;
 285         kfree(fh);
 286
 287         mutex_unlock(&saa7146_devices_lock);
 288
 289         return 0;
 290 }
 291
 292 static int fops_mmap(struct file *file, struct vm_area_struct * vma)
 293 {
 294         struct saa7146_fh *fh = file->private_data;
 295         struct videobuf_queue *q;
 296
 297         switch (fh->type) {
 298         case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 299                 DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, vma:%p\n",
 300                        file, vma);
 301                 q = &fh->video_q;
 302                 break;
 303                 }
 304         case V4L2_BUF_TYPE_VBI_CAPTURE: {
 305                 DEB_EE("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, vma:%p\n",
 306                        file, vma);
 307                 q = &fh->vbi_q;
 308                 break;
 309                 }
 310         default:
 311                 BUG();
 312                 return 0;
 313         }
 314
 315         return videobuf_mmap_mapper(q,vma);
 316 }
 317
 318 static unsigned int fops_poll(struct file *file, struct poll_table_struct *wait)
 319 {
 320         struct saa7146_fh *fh = file->private_data;
 321         struct videobuf_buffer *buf = NULL;
 322         struct videobuf_queue *q;
 323
 324         DEB_EE("file:%p, poll:%p\n", file, wait);
 325
 326         if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) {
 327                 if( 0 == fh->vbi_q.streaming )
 328                         return videobuf_poll_stream(file, &fh->vbi_q, wait);
 329                 q = &fh->vbi_q;
 330         } else {
 331                 DEB_D("using video queue\n");
 332                 q = &fh->video_q;
 333         }
 334
 335         if (!list_empty(&q->stream))
 336                 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
 337
 338         if (!buf) {
 339                 DEB_D("buf == NULL!\n");
 340                 return POLLERR;
 341         }
 342
 343         poll_wait(file, &buf->done, wait);
 344         if (buf->state == VIDEOBUF_DONE || buf->state == VIDEOBUF_ERROR) {
 345                 DEB_D("poll succeeded!\n");
 346                 return POLLIN|POLLRDNORM;
 347         }
 348
 349         DEB_D("nothing to poll for, buf->state:%d\n", buf->state);
 350         return 0;
 351 }
 352
 353 static ssize_t fops_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 354 {
 355         struct saa7146_fh *fh = file->private_data;
 356
 357         switch (fh->type) {
 358         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 359 /*
 360                 DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, data:%p, count:%lun",
 361                        file, data, (unsigned long)count);
 362 */
 363                 return saa7146_video_uops.read(file,data,count,ppos);
 364         case V4L2_BUF_TYPE_VBI_CAPTURE:
 365 /*
 366                 DEB_EE("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, data:%p, count:%lu\n",
 367                        file, data, (unsigned long)count);
 368 */
 369                 if (fh->dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 370                         return saa7146_vbi_uops.read(file,data,count,ppos);
 371                 return -EINVAL;
 372         default:
 373                 BUG();
 374                 return 0;
 375         }
 376 }
 377
 378 static ssize_t fops_write(struct file *file, const char __user *data, size_t count, loff_t *ppos)
 379 {
 380         struct saa7146_fh *fh = file->private_data;
 381
 382         switch (fh->type) {
 383         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 384                 return -EINVAL;
 385         case V4L2_BUF_TYPE_VBI_CAPTURE:
 386                 if (fh->dev->ext_vv_data->vbi_fops.write)
 387                         return fh->dev->ext_vv_data->vbi_fops.write(file, data, count, ppos);
 388                 else
 389                         return -EINVAL;
 390         default:
 391                 BUG();
 392                 return -EINVAL;
 393         }
 394 }
 395
 396 static const struct v4l2_file_operations video_fops =
 397 {
 398         .owner          = THIS_MODULE,
 399         .open           = fops_open,
 400         .release        = fops_release,
 401         .read           = fops_read,
 402         .write          = fops_write,
 403         .poll           = fops_poll,
 404         .mmap           = fops_mmap,
 405         .unlocked_ioctl = video_ioctl2,
 406 };
 407
 408 static void vv_callback(struct saa7146_dev *dev, unsigned long status)
 409 {
 410         u32 isr = status;
 411
 412         DEB_INT("dev:%p, isr:0x%08x\n", dev, (u32)status);
 413
 414         if (0 != (isr & (MASK_27))) {
 415                 DEB_INT("irq: RPS0 (0x%08x)\n", isr);
 416                 saa7146_video_uops.irq_done(dev,isr);
 417         }
 418
 419         if (0 != (isr & (MASK_28))) {
 420                 u32 mc2 = saa7146_read(dev, MC2);
 421                 if( 0 != (mc2 & MASK_15)) {
 422                         DEB_INT("irq: RPS1 vbi workaround (0x%08x)\n", isr);
 423                         wake_up(&dev->vv_data->vbi_wq);
 424                         saa7146_write(dev,MC2, MASK_31);
 425                         return;
 426                 }
 427                 DEB_INT("irq: RPS1 (0x%08x)\n", isr);
 428                 saa7146_vbi_uops.irq_done(dev,isr);
 429         }
 430 }
 431
 432 int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
 433 {
 434         struct saa7146_vv *vv;
 435         int err;
 436
 437         err = v4l2_device_register(&dev->pci->dev, &dev->v4l2_dev);
 438         if (err)
 439                 return err;
 440
 441         vv = kzalloc(sizeof(struct saa7146_vv), GFP_KERNEL);
 442         if (vv == NULL) {
 443                 ERR("out of memory. aborting.\n");
 444                 return -ENOMEM;
 445         }
 446         ext_vv->ops = saa7146_video_ioctl_ops;
 447         ext_vv->core_ops = &saa7146_video_ioctl_ops;
 448
 449         DEB_EE("dev:%p\n", dev);
 450
 451         /* set default values for video parts of the saa7146 */
 452         saa7146_write(dev, BCS_CTRL, 0x80400040);
 453
 454         /* enable video-port pins */
 455         saa7146_write(dev, MC1, (MASK_10 | MASK_26));
 456
 457         /* save per-device extension data (one extension can
 458            handle different devices that might need different
 459            configuration data) */
 460         dev->ext_vv_data = ext_vv;
 461
 462         vv->d_clipping.cpu_addr = pci_alloc_consistent(dev->pci, SAA7146_CLIPPING_MEM, &vv->d_clipping.dma_handle);
 463         if( NULL == vv->d_clipping.cpu_addr ) {
 464                 ERR("out of memory. aborting.\n");
 465                 kfree(vv);
 466                 return -1;
 467         }
 468         memset(vv->d_clipping.cpu_addr, 0x0, SAA7146_CLIPPING_MEM);
 469
 470         saa7146_video_uops.init(dev,vv);
 471         if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 472                 saa7146_vbi_uops.init(dev,vv);
 473
 474         dev->vv_data = vv;
 475         dev->vv_callback = &vv_callback;
 476
 477         return 0;
 478 }
 479 EXPORT_SYMBOL_GPL(saa7146_vv_init);
 480
 481 int saa7146_vv_release(struct saa7146_dev* dev)
 482 {
 483         struct saa7146_vv *vv = dev->vv_data;
 484
 485         DEB_EE("dev:%p\n", dev);
 486
 487         v4l2_device_unregister(&dev->v4l2_dev);
 488         pci_free_consistent(dev->pci, SAA7146_CLIPPING_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
 489         kfree(vv);
 490         dev->vv_data = NULL;
 491         dev->vv_callback = NULL;
 492
 493         return 0;
 494 }
 495 EXPORT_SYMBOL_GPL(saa7146_vv_release);
 496
 497 int saa7146_register_device(struct video_device **vid, struct saa7146_dev* dev,
 498                             char *name, int type)
 499 {
 500         struct video_device *vfd;
 501         int err;
 502         int i;
 503
 504         DEB_EE("dev:%p, name:'%s', type:%d\n", dev, name, type);
 505
 506         // released by vfd->release
 507         vfd = video_device_alloc();
 508         if (vfd == NULL)
 509                 return -ENOMEM;
 510
 511         vfd->fops = &video_fops;
 512         vfd->ioctl_ops = &dev->ext_vv_data->ops;
 513         vfd->release = video_device_release;
 514         vfd->lock = &dev->v4l2_lock;
 515         vfd->tvnorms = 0;
 516         for (i = 0; i < dev->ext_vv_data->num_stds; i++)
 517                 vfd->tvnorms |= dev->ext_vv_data->stds[i].id;
 518         strlcpy(vfd->name, name, sizeof(vfd->name));
 519         video_set_drvdata(vfd, dev);
 520
 521         err = video_register_device(vfd, type, -1);
 522         if (err < 0) {
 523                 ERR("cannot register v4l2 device. skipping.\n");
 524                 video_device_release(vfd);
 525                 return err;
 526         }
 527
 528         pr_info("%s: registered device %s [v4l2]\n",
 529                 dev->name, video_device_node_name(vfd));
 530
 531         *vid = vfd;
 532         return 0;
 533 }
 534 EXPORT_SYMBOL_GPL(saa7146_register_device);
 535
 536 int saa7146_unregister_device(struct video_device **vid, struct saa7146_dev* dev)
 537 {
 538         DEB_EE("dev:%p\n", dev);
 539
 540         video_unregister_device(*vid);
 541         *vid = NULL;
 542
 543         return 0;
 544 }
 545 EXPORT_SYMBOL_GPL(saa7146_unregister_device);
 546
 547 static int __init saa7146_vv_init_module(void)
 548 {
 549         return 0;
 550 }
 551
 552
 553 static void __exit saa7146_vv_cleanup_module(void)
 554 {
 555 }
 556
 557 module_init(saa7146_vv_init_module);
 558 module_exit(saa7146_vv_cleanup_module);
 559
 560 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 561 MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
 562 MODULE_LICENSE("GPL");