drivers/media/common/saa7146_fops.c

   1 #include <media/saa7146_vv.h>
   2 #include <linux/version.h>
   3
   4 #define BOARD_CAN_DO_VBI(dev)   (dev->revision != 0 && dev->vv_data->vbi_minor != -1)
   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",bit,vv->resources));
  16                 /* have it already allocated */
  17                 return 1;
  18         }
  19
  20         /* is it free? */
  21         down(&dev->lock);
  22         if (vv->resources & bit) {
  23                 DEB_D(("locked! vv->resources:0x%02x, we want:0x%02x\n",vv->resources,bit));
  24                 /* no, someone else uses it */
  25                 up(&dev->lock);
  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         up(&dev->lock);
  33         return 1;
  34 }
  35
  36 void saa7146_res_free(struct saa7146_fh *fh, unsigned int bits)
  37 {
  38         struct saa7146_dev *dev = fh->dev;
  39         struct saa7146_vv *vv = dev->vv_data;
  40
  41         if ((fh->resources & bits) != bits)
  42                 BUG();
  43
  44         down(&dev->lock);
  45         fh->resources  &= ~bits;
  46         vv->resources &= ~bits;
  47         DEB_D(("res: put 0x%02x, cur:0x%02x\n",bits,vv->resources));
  48         up(&dev->lock);
  49 }
  50
  51
  52 /********************************************************************************/
  53 /* common dma functions */
  54
  55 void saa7146_dma_free(struct saa7146_dev *dev,struct saa7146_buf *buf)
  56 {
  57         DEB_EE(("dev:%p, buf:%p\n",dev,buf));
  58
  59         if (in_interrupt())
  60                 BUG();
  61
  62         videobuf_waiton(&buf->vb,0,0);
  63         videobuf_dma_pci_unmap(dev->pci, &buf->vb.dma);
  64         videobuf_dma_free(&buf->vb.dma);
  65         buf->vb.state = STATE_NEEDS_INIT;
  66 }
  67
  68
  69 /********************************************************************************/
  70 /* common buffer functions */
  71
  72 int saa7146_buffer_queue(struct saa7146_dev *dev,
  73                          struct saa7146_dmaqueue *q,
  74                          struct saa7146_buf *buf)
  75 {
  76 #ifdef DEBUG_SPINLOCKS
  77         BUG_ON(!spin_is_locked(&dev->slock));
  78 #endif
  79         DEB_EE(("dev:%p, dmaq:%p, buf:%p\n", dev, q, buf));
  80
  81         BUG_ON(!q);
  82
  83         if (NULL == q->curr) {
  84                 q->curr = buf;
  85                 DEB_D(("immediately activating buffer %p\n", buf));
  86                 buf->activate(dev,buf,NULL);
  87         } else {
  88                 list_add_tail(&buf->vb.queue,&q->queue);
  89                 buf->vb.state = STATE_QUEUED;
  90                 DEB_D(("adding buffer %p to queue. (active buffer present)\n", buf));
  91         }
  92         return 0;
  93 }
  94
  95 void saa7146_buffer_finish(struct saa7146_dev *dev,
  96                            struct saa7146_dmaqueue *q,
  97                            int state)
  98 {
  99 #ifdef DEBUG_SPINLOCKS
 100         BUG_ON(!spin_is_locked(&dev->slock));
 101 #endif
 102         DEB_EE(("dev:%p, dmaq:%p, state:%d\n", dev, q, state));
 103         DEB_EE(("q->curr:%p\n",q->curr));
 104
 105         BUG_ON(!q->curr);
 106
 107         /* finish current buffer */
 108         if (NULL == q->curr) {
 109                 DEB_D(("aiii. no current buffer\n"));
 110                 return;
 111         }
 112
 113         q->curr->vb.state = state;
 114         do_gettimeofday(&q->curr->vb.ts);
 115         wake_up(&q->curr->vb.done);
 116
 117         q->curr = NULL;
 118 }
 119
 120 void saa7146_buffer_next(struct saa7146_dev *dev,
 121                          struct saa7146_dmaqueue *q, int vbi)
 122 {
 123         struct saa7146_buf *buf,*next = NULL;
 124
 125         BUG_ON(!q);
 126
 127         DEB_INT(("dev:%p, dmaq:%p, vbi:%d\n", dev, q, vbi));
 128
 129 #ifdef DEBUG_SPINLOCKS
 130         BUG_ON(!spin_is_locked(&dev->slock));
 131 #endif
 132         if (!list_empty(&q->queue)) {
 133                 /* activate next one from queue */
 134                 buf = list_entry(q->queue.next,struct saa7146_buf,vb.queue);
 135                 list_del(&buf->vb.queue);
 136                 if (!list_empty(&q->queue))
 137                         next = list_entry(q->queue.next,struct saa7146_buf, vb.queue);
 138                 q->curr = buf;
 139                 DEB_INT(("next buffer: buf:%p, prev:%p, next:%p\n", buf, q->queue.prev,q->queue.next));
 140                 buf->activate(dev,buf,next);
 141         } else {
 142                 DEB_INT(("no next buffer. stopping.\n"));
 143                 if( 0 != vbi ) {
 144                         /* turn off video-dma3 */
 145                         saa7146_write(dev,MC1, MASK_20);
 146                 } else {
 147                         /* nothing to do -- just prevent next video-dma1 transfer
 148                            by lowering the protection address */
 149
 150                         // fixme: fix this for vflip != 0
 151
 152                         saa7146_write(dev, PROT_ADDR1, 0);
 153                         saa7146_write(dev, MC2, (MASK_02|MASK_18));
 154
 155                         /* write the address of the rps-program */
 156                         saa7146_write(dev, RPS_ADDR0, dev->d_rps0.dma_handle);
 157                         /* turn on rps */
 158                         saa7146_write(dev, MC1, (MASK_12 | MASK_28));
 159
 160 /*
 161                         printk("vdma%d.base_even:     0x%08x\n", 1,saa7146_read(dev,BASE_EVEN1));
 162                         printk("vdma%d.base_odd:      0x%08x\n", 1,saa7146_read(dev,BASE_ODD1));
 163                         printk("vdma%d.prot_addr:     0x%08x\n", 1,saa7146_read(dev,PROT_ADDR1));
 164                         printk("vdma%d.base_page:     0x%08x\n", 1,saa7146_read(dev,BASE_PAGE1));
 165                         printk("vdma%d.pitch:         0x%08x\n", 1,saa7146_read(dev,PITCH1));
 166                         printk("vdma%d.num_line_byte: 0x%08x\n", 1,saa7146_read(dev,NUM_LINE_BYTE1));
 167 */
 168                 }
 169                 del_timer(&q->timeout);
 170         }
 171 }
 172
 173 void saa7146_buffer_timeout(unsigned long data)
 174 {
 175         struct saa7146_dmaqueue *q = (struct saa7146_dmaqueue*)data;
 176         struct saa7146_dev *dev = q->dev;
 177         unsigned long flags;
 178
 179         DEB_EE(("dev:%p, dmaq:%p\n", dev, q));
 180
 181         spin_lock_irqsave(&dev->slock,flags);
 182         if (q->curr) {
 183                 DEB_D(("timeout on %p\n", q->curr));
 184                 saa7146_buffer_finish(dev,q,STATE_ERROR);
 185         }
 186
 187         /* we don't restart the transfer here like other drivers do. when
 188            a streaming capture is disabled, the timeout function will be
 189            called for the current buffer. if we activate the next buffer now,
 190            we mess up our capture logic. if a timeout occurs on another buffer,
 191            then something is seriously broken before, so no need to buffer the
 192            next capture IMHO... */
 193 /*
 194         saa7146_buffer_next(dev,q);
 195 */
 196         spin_unlock_irqrestore(&dev->slock,flags);
 197 }
 198
 199 /********************************************************************************/
 200 /* file operations */
 201
 202 static int fops_open(struct inode *inode, struct file *file)
 203 {
 204         unsigned int minor = iminor(inode);
 205         struct saa7146_dev *h = NULL, *dev = NULL;
 206         struct list_head *list;
 207         struct saa7146_fh *fh = NULL;
 208         int result = 0;
 209
 210         enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 211
 212         DEB_EE(("inode:%p, file:%p, minor:%d\n",inode,file,minor));
 213
 214         if (down_interruptible(&saa7146_devices_lock))
 215                 return -ERESTARTSYS;
 216
 217         list_for_each(list,&saa7146_devices) {
 218                 h = list_entry(list, struct saa7146_dev, item);
 219                 if( NULL == h->vv_data ) {
 220                         DEB_D(("device %p has not registered video devices.\n",h));
 221                         continue;
 222                 }
 223                 DEB_D(("trying: %p @ major %d,%d\n",h,h->vv_data->video_minor,h->vv_data->vbi_minor));
 224
 225                 if (h->vv_data->video_minor == minor) {
 226                         dev = h;
 227                 }
 228                 if (h->vv_data->vbi_minor == minor) {
 229                         type = V4L2_BUF_TYPE_VBI_CAPTURE;
 230                         dev = h;
 231                 }
 232         }
 233         if (NULL == dev) {
 234                 DEB_S(("no such video device.\n"));
 235                 result = -ENODEV;
 236                 goto out;
 237         }
 238
 239         DEB_D(("using: %p\n",dev));
 240
 241         /* check if an extension is registered */
 242         if( NULL == dev->ext ) {
 243                 DEB_S(("no extension registered for this device.\n"));
 244                 result = -ENODEV;
 245                 goto out;
 246         }
 247
 248         /* allocate per open data */
 249         fh = kmalloc(sizeof(*fh),GFP_KERNEL);
 250         if (NULL == fh) {
 251                 DEB_S(("cannot allocate memory for per open data.\n"));
 252                 result = -ENOMEM;
 253                 goto out;
 254         }
 255         memset(fh,0,sizeof(*fh));
 256
 257         file->private_data = fh;
 258         fh->dev = dev;
 259         fh->type = type;
 260
 261         if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 262                 DEB_S(("initializing vbi...\n"));
 263                 result = saa7146_vbi_uops.open(dev,file);
 264         } else {
 265                 DEB_S(("initializing video...\n"));
 266                 result = saa7146_video_uops.open(dev,file);
 267         }
 268
 269         if (0 != result) {
 270                 goto out;
 271         }
 272
 273         if( 0 == try_module_get(dev->ext->module)) {
 274                 result = -EINVAL;
 275                 goto out;
 276         }
 277
 278         result = 0;
 279 out:
 280         if( fh != 0 && result != 0 ) {
 281                 kfree(fh);
 282                 file->private_data = NULL;
 283         }
 284         up(&saa7146_devices_lock);
 285         return result;
 286 }
 287
 288 static int fops_release(struct inode *inode, struct file *file)
 289 {
 290         struct saa7146_fh  *fh  = file->private_data;
 291         struct saa7146_dev *dev = fh->dev;
 292
 293         DEB_EE(("inode:%p, file:%p\n",inode,file));
 294
 295         if (down_interruptible(&saa7146_devices_lock))
 296                 return -ERESTARTSYS;
 297
 298         if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 299                 saa7146_vbi_uops.release(dev,file);
 300         } else {
 301                 saa7146_video_uops.release(dev,file);
 302         }
 303
 304         module_put(dev->ext->module);
 305         file->private_data = NULL;
 306         kfree(fh);
 307
 308         up(&saa7146_devices_lock);
 309
 310         return 0;
 311 }
 312
 313 int saa7146_video_do_ioctl(struct inode *inode, struct file *file, unsigned int cmd, void *arg);
 314 static int fops_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 315 {
 316 /*
 317         DEB_EE(("inode:%p, file:%p, cmd:%d, arg:%li\n",inode, file, cmd, arg));
 318 */
 319         return video_usercopy(inode, file, cmd, arg, saa7146_video_do_ioctl);
 320 }
 321
 322 static int fops_mmap(struct file *file, struct vm_area_struct * vma)
 323 {
 324         struct saa7146_fh *fh = file->private_data;
 325         struct videobuf_queue *q;
 326
 327         switch (fh->type) {
 328         case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 329                 DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, vma:%p\n",file, vma));
 330                 q = &fh->video_q;
 331                 break;
 332                 }
 333         case V4L2_BUF_TYPE_VBI_CAPTURE: {
 334                 DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, vma:%p\n",file, vma));
 335                 q = &fh->vbi_q;
 336                 break;
 337                 }
 338         default:
 339                 BUG();
 340                 return 0;
 341         }
 342         return videobuf_mmap_mapper(q,vma);
 343 }
 344
 345 static unsigned int fops_poll(struct file *file, struct poll_table_struct *wait)
 346 {
 347         struct saa7146_fh *fh = file->private_data;
 348         struct videobuf_buffer *buf = NULL;
 349         struct videobuf_queue *q;
 350
 351         DEB_EE(("file:%p, poll:%p\n",file, wait));
 352
 353         if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) {
 354                 if( 0 == fh->vbi_q.streaming )
 355                         return videobuf_poll_stream(file, &fh->vbi_q, wait);
 356                 q = &fh->vbi_q;
 357         } else {
 358                 DEB_D(("using video queue.\n"));
 359                 q = &fh->video_q;
 360         }
 361
 362         if (!list_empty(&q->stream))
 363                 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
 364
 365         if (!buf) {
 366                 DEB_D(("buf == NULL!\n"));
 367                 return POLLERR;
 368         }
 369
 370         poll_wait(file, &buf->done, wait);
 371         if (buf->state == STATE_DONE || buf->state == STATE_ERROR) {
 372                 DEB_D(("poll succeeded!\n"));
 373                 return POLLIN|POLLRDNORM;
 374         }
 375
 376         DEB_D(("nothing to poll for, buf->state:%d\n",buf->state));
 377         return 0;
 378 }
 379
 380 static ssize_t fops_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 381 {
 382         struct saa7146_fh *fh = file->private_data;
 383
 384         switch (fh->type) {
 385         case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 386 //              DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, data:%p, count:%lun", file, data, (unsigned long)count));
 387                 return saa7146_video_uops.read(file,data,count,ppos);
 388                 }
 389         case V4L2_BUF_TYPE_VBI_CAPTURE: {
 390 //              DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, data:%p, count:%lu\n", file, data, (unsigned long)count));
 391                 return saa7146_vbi_uops.read(file,data,count,ppos);
 392                 }
 393                 break;
 394         default:
 395                 BUG();
 396                 return 0;
 397         }
 398 }
 399
 400 static struct file_operations video_fops =
 401 {
 402         .owner          = THIS_MODULE,
 403         .open           = fops_open,
 404         .release        = fops_release,
 405         .read           = fops_read,
 406         .poll           = fops_poll,
 407         .mmap           = fops_mmap,
 408         .ioctl          = fops_ioctl,
 409         .llseek         = no_llseek,
 410 };
 411
 412 void vv_callback(struct saa7146_dev *dev, unsigned long status)
 413 {
 414         u32 isr = status;
 415
 416         DEB_INT(("dev:%p, isr:0x%08x\n",dev,(u32)status));
 417
 418         if (0 != (isr & (MASK_27))) {
 419                 DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
 420                 saa7146_video_uops.irq_done(dev,isr);
 421         }
 422
 423         if (0 != (isr & (MASK_28))) {
 424                 u32 mc2 = saa7146_read(dev, MC2);
 425                 if( 0 != (mc2 & MASK_15)) {
 426                         DEB_INT(("irq: RPS1 vbi workaround (0x%08x).\n",isr));
 427                         wake_up(&dev->vv_data->vbi_wq);
 428                         saa7146_write(dev,MC2, MASK_31);
 429                         return;
 430                 }
 431                 DEB_INT(("irq: RPS1 (0x%08x).\n",isr));
 432                 saa7146_vbi_uops.irq_done(dev,isr);
 433         }
 434 }
 435
 436 static struct video_device device_template =
 437 {
 438         .hardware       = VID_HARDWARE_SAA7146,
 439         .fops           = &video_fops,
 440         .minor          = -1,
 441 };
 442
 443 int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
 444 {
 445         struct saa7146_vv *vv = kmalloc (sizeof(struct saa7146_vv),GFP_KERNEL);
 446         if( NULL == vv ) {
 447                 ERR(("out of memory. aborting.\n"));
 448                 return -1;
 449         }
 450         memset(vv, 0x0, sizeof(*vv));
 451
 452         DEB_EE(("dev:%p\n",dev));
 453
 454         /* set default values for video parts of the saa7146 */
 455         saa7146_write(dev, BCS_CTRL, 0x80400040);
 456
 457         /* enable video-port pins */
 458         saa7146_write(dev, MC1, (MASK_10 | MASK_26));
 459
 460         /* save per-device extension data (one extension can
 461            handle different devices that might need different
 462            configuration data) */
 463         dev->ext_vv_data = ext_vv;
 464
 465         vv->video_minor = -1;
 466         vv->vbi_minor = -1;
 467
 468         vv->d_clipping.cpu_addr = pci_alloc_consistent(dev->pci, SAA7146_CLIPPING_MEM, &vv->d_clipping.dma_handle);
 469         if( NULL == vv->d_clipping.cpu_addr ) {
 470                 ERR(("out of memory. aborting.\n"));
 471                 kfree(vv);
 472                 return -1;
 473         }
 474         memset(vv->d_clipping.cpu_addr, 0x0, SAA7146_CLIPPING_MEM);
 475
 476         saa7146_video_uops.init(dev,vv);
 477         saa7146_vbi_uops.init(dev,vv);
 478
 479         dev->vv_data = vv;
 480         dev->vv_callback = &vv_callback;
 481
 482         return 0;
 483 }
 484
 485 int saa7146_vv_release(struct saa7146_dev* dev)
 486 {
 487         struct saa7146_vv *vv = dev->vv_data;
 488
 489         DEB_EE(("dev:%p\n",dev));
 490
 491         pci_free_consistent(dev->pci, SAA7146_RPS_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
 492         kfree(vv);
 493         dev->vv_data = NULL;
 494         dev->vv_callback = NULL;
 495
 496         return 0;
 497 }
 498
 499 int saa7146_register_device(struct video_device **vid, struct saa7146_dev* dev,
 500                             char *name, int type)
 501 {
 502         struct saa7146_vv *vv = dev->vv_data;
 503         struct video_device *vfd;
 504
 505         DEB_EE(("dev:%p, name:'%s', type:%d\n",dev,name,type));
 506
 507         // released by vfd->release
 508         vfd = video_device_alloc();
 509         if (vfd == NULL)
 510                 return -ENOMEM;
 511
 512         memcpy(vfd, &device_template, sizeof(struct video_device));
 513         strlcpy(vfd->name, name, sizeof(vfd->name));
 514         vfd->release = video_device_release;
 515         vfd->priv = dev;
 516
 517         // fixme: -1 should be an insmod parameter *for the extension* (like "video_nr");
 518         if (video_register_device(vfd, type, -1) < 0) {
 519                 ERR(("cannot register v4l2 device. skipping.\n"));
 520                 return -1;
 521         }
 522
 523         if( VFL_TYPE_GRABBER == type ) {
 524                 vv->video_minor = vfd->minor;
 525                 INFO(("%s: registered device video%d [v4l2]\n",
 526                         dev->name, vfd->minor & 0x1f));
 527         } else {
 528                 vv->vbi_minor = vfd->minor;
 529                 INFO(("%s: registered device vbi%d [v4l2]\n",
 530                         dev->name, vfd->minor & 0x1f));
 531         }
 532
 533         *vid = vfd;
 534         return 0;
 535 }
 536
 537 int saa7146_unregister_device(struct video_device **vid, struct saa7146_dev* dev)
 538 {
 539         struct saa7146_vv *vv = dev->vv_data;
 540
 541         DEB_EE(("dev:%p\n",dev));
 542
 543         if( VFL_TYPE_GRABBER == (*vid)->type ) {
 544                 vv->video_minor = -1;
 545         } else {
 546                 vv->vbi_minor = -1;
 547         }
 548
 549         video_unregister_device(*vid);
 550         *vid = NULL;
 551
 552         return 0;
 553 }
 554
 555 static int __init saa7146_vv_init_module(void)
 556 {
 557         return 0;
 558 }
 559
 560
 561 static void __exit saa7146_vv_cleanup_module(void)
 562 {
 563 }
 564
 565 module_init(saa7146_vv_init_module);
 566 module_exit(saa7146_vv_cleanup_module);
 567
 568 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 569 MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
 570 MODULE_LICENSE("GPL");