drivers/media/common/saa7146_fops.c

   1 #include <media/saa7146_vv.h>
   2
   3 #define BOARD_CAN_DO_VBI(dev)   (dev->revision != 0 && dev->vv_data->vbi_minor != -1)
   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",bit,vv->resources));
  15                 /* have it already allocated */
  16                 return 1;
  17         }
  18
  19         /* is it free? */
  20         down(&dev->lock);
  21         if (vv->resources & bit) {
  22                 DEB_D(("locked! vv->resources:0x%02x, we want:0x%02x\n",vv->resources,bit));
  23                 /* no, someone else uses it */
  24                 up(&dev->lock);
  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         up(&dev->lock);
  32         return 1;
  33 }
  34
  35 int saa7146_res_check(struct saa7146_fh *fh, unsigned int bit)
  36 {
  37         return (fh->resources & bit);
  38 }
  39
  40 int saa7146_res_locked(struct saa7146_dev *dev, unsigned int bit)
  41 {
  42         struct saa7146_vv *vv = dev->vv_data;
  43         return (vv->resources & bit);
  44 }
  45
  46 void saa7146_res_free(struct saa7146_fh *fh, unsigned int bits)
  47 {
  48         struct saa7146_dev *dev = fh->dev;
  49         struct saa7146_vv *vv = dev->vv_data;
  50
  51         if ((fh->resources & bits) != bits)
  52                 BUG();
  53
  54         down(&dev->lock);
  55         fh->resources  &= ~bits;
  56         vv->resources &= ~bits;
  57         DEB_D(("res: put 0x%02x, cur:0x%02x\n",bits,vv->resources));
  58         up(&dev->lock);
  59 }
  60
  61
  62 /********************************************************************************/
  63 /* common dma functions */
  64
  65 void saa7146_dma_free(struct saa7146_dev *dev,struct saa7146_buf *buf)
  66 {
  67         DEB_EE(("dev:%p, buf:%p\n",dev,buf));
  68
  69         if (in_interrupt())
  70                 BUG();
  71
  72         videobuf_waiton(&buf->vb,0,0);
  73         videobuf_dma_pci_unmap(dev->pci, &buf->vb.dma);
  74         videobuf_dma_free(&buf->vb.dma);
  75         buf->vb.state = STATE_NEEDS_INIT;
  76 }
  77
  78
  79 /********************************************************************************/
  80 /* common buffer functions */
  81
  82 int saa7146_buffer_queue(struct saa7146_dev *dev,
  83                          struct saa7146_dmaqueue *q,
  84                          struct saa7146_buf *buf)
  85 {
  86 #if DEBUG_SPINLOCKS
  87         BUG_ON(!spin_is_locked(&dev->slock));
  88 #endif
  89         DEB_EE(("dev:%p, dmaq:%p, buf:%p\n", dev, q, buf));
  90
  91         if( NULL == q ) {
  92                 ERR(("internal error: fatal NULL pointer for q.\n"));
  93                 return 0;
  94         }
  95
  96         if (NULL == q->curr) {
  97                 q->curr = buf;
  98                 DEB_D(("immediately activating buffer %p\n", buf));
  99                 buf->activate(dev,buf,NULL);
 100         } else {
 101                 list_add_tail(&buf->vb.queue,&q->queue);
 102                 buf->vb.state = STATE_QUEUED;
 103                 DEB_D(("adding buffer %p to queue. (active buffer present)\n", buf));
 104         }
 105         return 0;
 106 }
 107
 108 void saa7146_buffer_finish(struct saa7146_dev *dev,
 109                            struct saa7146_dmaqueue *q,
 110                            int state)
 111 {
 112 #if DEBUG_SPINLOCKS
 113         BUG_ON(!spin_is_locked(&dev->slock));
 114 #endif
 115         if( NULL == q->curr ) {
 116                 ERR(("internal error: fatal NULL pointer for q->curr.\n"));
 117                 return;
 118         }
 119
 120         DEB_EE(("dev:%p, dmaq:%p, state:%d\n", dev, q, state));
 121         DEB_EE(("q->curr:%p\n",q->curr));
 122
 123         /* finish current buffer */
 124         if (NULL == q->curr) {
 125                 DEB_D(("aiii. no current buffer\n"));
 126                 return;
 127         }
 128
 129         q->curr->vb.state = state;
 130         do_gettimeofday(&q->curr->vb.ts);
 131         wake_up(&q->curr->vb.done);
 132
 133         q->curr = NULL;
 134 }
 135
 136 void saa7146_buffer_next(struct saa7146_dev *dev,
 137                          struct saa7146_dmaqueue *q, int vbi)
 138 {
 139         struct saa7146_buf *buf,*next = NULL;
 140
 141         if( NULL == q ) {
 142                 ERR(("internal error: fatal NULL pointer for q.\n"));
 143                 return;
 144         }
 145
 146         DEB_INT(("dev:%p, dmaq:%p, vbi:%d\n", dev, q, vbi));
 147
 148 #if DEBUG_SPINLOCKS
 149         BUG_ON(!spin_is_locked(&dev->slock));
 150 #endif
 151         if (!list_empty(&q->queue)) {
 152                 /* activate next one from queue */
 153                 buf = list_entry(q->queue.next,struct saa7146_buf,vb.queue);
 154                 list_del(&buf->vb.queue);
 155                 if (!list_empty(&q->queue))
 156                         next = list_entry(q->queue.next,struct saa7146_buf, vb.queue);
 157                 q->curr = buf;
 158                 DEB_INT(("next buffer: buf:%p, prev:%p, next:%p\n", buf, q->queue.prev,q->queue.next));
 159                 buf->activate(dev,buf,next);
 160         } else {
 161                 DEB_INT(("no next buffer. stopping.\n"));
 162                 if( 0 != vbi ) {
 163                         /* turn off video-dma3 */
 164                         saa7146_write(dev,MC1, MASK_20);
 165                 } else {
 166                         /* nothing to do -- just prevent next video-dma1 transfer
 167                            by lowering the protection address */
 168
 169                         // fixme: fix this for vflip != 0
 170
 171                         saa7146_write(dev, PROT_ADDR1, 0);
 172                         saa7146_write(dev, MC2, (MASK_02|MASK_18));
 173
 174                         /* write the address of the rps-program */
 175                         saa7146_write(dev, RPS_ADDR0, dev->d_rps0.dma_handle);
 176                         /* turn on rps */
 177                         saa7146_write(dev, MC1, (MASK_12 | MASK_28));
 178
 179 /*
 180                         printk("vdma%d.base_even:     0x%08x\n", 1,saa7146_read(dev,BASE_EVEN1));
 181                         printk("vdma%d.base_odd:      0x%08x\n", 1,saa7146_read(dev,BASE_ODD1));
 182                         printk("vdma%d.prot_addr:     0x%08x\n", 1,saa7146_read(dev,PROT_ADDR1));
 183                         printk("vdma%d.base_page:     0x%08x\n", 1,saa7146_read(dev,BASE_PAGE1));
 184                         printk("vdma%d.pitch:         0x%08x\n", 1,saa7146_read(dev,PITCH1));
 185                         printk("vdma%d.num_line_byte: 0x%08x\n", 1,saa7146_read(dev,NUM_LINE_BYTE1));
 186 */
 187                 }
 188                 del_timer(&q->timeout);
 189         }
 190 }
 191
 192 void saa7146_buffer_timeout(unsigned long data)
 193 {
 194         struct saa7146_dmaqueue *q = (struct saa7146_dmaqueue*)data;
 195         struct saa7146_dev *dev = q->dev;
 196         unsigned long flags;
 197
 198         DEB_EE(("dev:%p, dmaq:%p\n", dev, q));
 199
 200         spin_lock_irqsave(&dev->slock,flags);
 201         if (q->curr) {
 202                 DEB_D(("timeout on %p\n", q->curr));
 203                 saa7146_buffer_finish(dev,q,STATE_ERROR);
 204         }
 205
 206         /* we don't restart the transfer here like other drivers do. when
 207            a streaming capture is disabled, the timeout function will be
 208            called for the current buffer. if we activate the next buffer now,
 209            we mess up our capture logic. if a timeout occurs on another buffer,
 210            then something is seriously broken before, so no need to buffer the
 211            next capture IMHO... */
 212 /*
 213         saa7146_buffer_next(dev,q);
 214 */
 215         spin_unlock_irqrestore(&dev->slock,flags);
 216 }
 217
 218 /********************************************************************************/
 219 /* file operations */
 220
 221 static int fops_open(struct inode *inode, struct file *file)
 222 {
 223         unsigned int minor = iminor(inode);
 224         struct saa7146_dev *h = NULL, *dev = NULL;
 225         struct list_head *list;
 226         struct saa7146_fh *fh = NULL;
 227         int result = 0;
 228
 229         enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 230
 231         DEB_EE(("inode:%p, file:%p, minor:%d\n",inode,file,minor));
 232
 233         if (down_interruptible(&saa7146_devices_lock))
 234                 return -ERESTARTSYS;
 235
 236         list_for_each(list,&saa7146_devices) {
 237                 h = list_entry(list, struct saa7146_dev, item);
 238                 if( NULL == h->vv_data ) {
 239                         DEB_D(("device %p has not registered video devices.\n",h));
 240                         continue;
 241                 }
 242                 DEB_D(("trying: %p @ major %d,%d\n",h,h->vv_data->video_minor,h->vv_data->vbi_minor));
 243
 244                 if (h->vv_data->video_minor == minor) {
 245                         dev = h;
 246                 }
 247                 if (h->vv_data->vbi_minor == minor) {
 248                         type = V4L2_BUF_TYPE_VBI_CAPTURE;
 249                         dev = h;
 250                 }
 251         }
 252         if (NULL == dev) {
 253                 DEB_S(("no such video device.\n"));
 254                 result = -ENODEV;
 255                 goto out;
 256         }
 257
 258         DEB_D(("using: %p\n",dev));
 259
 260         /* check if an extension is registered */
 261         if( NULL == dev->ext ) {
 262                 DEB_S(("no extension registered for this device.\n"));
 263                 result = -ENODEV;
 264                 goto out;
 265         }
 266
 267         /* allocate per open data */
 268         fh = kmalloc(sizeof(*fh),GFP_KERNEL);
 269         if (NULL == fh) {
 270                 DEB_S(("cannot allocate memory for per open data.\n"));
 271                 result = -ENOMEM;
 272                 goto out;
 273         }
 274         memset(fh,0,sizeof(*fh));
 275
 276         file->private_data = fh;
 277         fh->dev = dev;
 278         fh->type = type;
 279
 280         if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 281                 DEB_S(("initializing vbi...\n"));
 282                 result = saa7146_vbi_uops.open(dev,file);
 283         } else {
 284                 DEB_S(("initializing video...\n"));
 285                 result = saa7146_video_uops.open(dev,file);
 286         }
 287
 288         if (0 != result) {
 289                 goto out;
 290         }
 291
 292         if( 0 == try_module_get(dev->ext->module)) {
 293                 result = -EINVAL;
 294                 goto out;
 295         }
 296
 297         result = 0;
 298 out:
 299         if( fh != 0 && result != 0 ) {
 300                 kfree(fh);
 301                 file->private_data = NULL;
 302         }
 303         up(&saa7146_devices_lock);
 304         return result;
 305 }
 306
 307 static int fops_release(struct inode *inode, struct file *file)
 308 {
 309         struct saa7146_fh  *fh  = file->private_data;
 310         struct saa7146_dev *dev = fh->dev;
 311
 312         DEB_EE(("inode:%p, file:%p\n",inode,file));
 313
 314         if (down_interruptible(&saa7146_devices_lock))
 315                 return -ERESTARTSYS;
 316
 317         if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 318                 saa7146_vbi_uops.release(dev,file);
 319         } else {
 320                 saa7146_video_uops.release(dev,file);
 321         }
 322
 323         module_put(dev->ext->module);
 324         file->private_data = NULL;
 325         kfree(fh);
 326
 327         up(&saa7146_devices_lock);
 328
 329         return 0;
 330 }
 331
 332 int saa7146_video_do_ioctl(struct inode *inode, struct file *file, unsigned int cmd, void *arg);
 333 static int fops_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 334 {
 335 /*
 336         DEB_EE(("inode:%p, file:%p, cmd:%d, arg:%li\n",inode, file, cmd, arg));
 337 */
 338         return video_usercopy(inode, file, cmd, arg, saa7146_video_do_ioctl);
 339 }
 340
 341 static int fops_mmap(struct file *file, struct vm_area_struct * vma)
 342 {
 343         struct saa7146_fh *fh = file->private_data;
 344         struct videobuf_queue *q;
 345
 346         switch (fh->type) {
 347         case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 348                 DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, vma:%p\n",file, vma));
 349                 q = &fh->video_q;
 350                 break;
 351                 }
 352         case V4L2_BUF_TYPE_VBI_CAPTURE: {
 353                 DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, vma:%p\n",file, vma));
 354                 q = &fh->vbi_q;
 355                 break;
 356                 }
 357         default:
 358                 BUG();
 359                 return 0;
 360         }
 361         return videobuf_mmap_mapper(vma,q);
 362 }
 363
 364 static unsigned int fops_poll(struct file *file, struct poll_table_struct *wait)
 365 {
 366         struct saa7146_fh *fh = file->private_data;
 367         struct videobuf_buffer *buf = NULL;
 368         struct videobuf_queue *q;
 369
 370         DEB_EE(("file:%p, poll:%p\n",file, wait));
 371
 372         if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) {
 373                 if( 0 == fh->vbi_q.streaming )
 374                         return videobuf_poll_stream(file, &fh->vbi_q, wait);
 375                 q = &fh->vbi_q;
 376         } else {
 377                 DEB_D(("using video queue.\n"));
 378                 q = &fh->video_q;
 379         }
 380
 381         if (!list_empty(&q->stream))
 382                 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
 383
 384         if (!buf) {
 385                 DEB_D(("buf == NULL!\n"));
 386                 return POLLERR;
 387         }
 388
 389         poll_wait(file, &buf->done, wait);
 390         if (buf->state == STATE_DONE || buf->state == STATE_ERROR) {
 391                 DEB_D(("poll succeeded!\n"));
 392                 return POLLIN|POLLRDNORM;
 393         }
 394
 395         DEB_D(("nothing to poll for, buf->state:%d\n",buf->state));
 396         return 0;
 397 }
 398
 399 static ssize_t fops_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 400 {
 401         struct saa7146_fh *fh = file->private_data;
 402
 403         switch (fh->type) {
 404         case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 405 //              DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, data:%p, count:%lun", file, data, (unsigned long)count));
 406                 return saa7146_video_uops.read(file,data,count,ppos);
 407                 }
 408         case V4L2_BUF_TYPE_VBI_CAPTURE: {
 409 //              DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, data:%p, count:%lu\n", file, data, (unsigned long)count));
 410                 return saa7146_vbi_uops.read(file,data,count,ppos);
 411                 }
 412                 break;
 413         default:
 414                 BUG();
 415                 return 0;
 416         }
 417 }
 418
 419 static struct file_operations video_fops =
 420 {
 421         .owner          = THIS_MODULE,
 422         .open           = fops_open,
 423         .release        = fops_release,
 424         .read           = fops_read,
 425         .poll           = fops_poll,
 426         .mmap           = fops_mmap,
 427         .ioctl          = fops_ioctl,
 428         .llseek         = no_llseek,
 429 };
 430
 431 void vv_callback(struct saa7146_dev *dev, unsigned long status)
 432 {
 433         u32 isr = status;
 434
 435         DEB_INT(("dev:%p, isr:0x%08x\n",dev,(u32)status));
 436
 437         if (0 != (isr & (MASK_27))) {
 438                 DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
 439                 saa7146_video_uops.irq_done(dev,isr);
 440         }
 441
 442         if (0 != (isr & (MASK_28))) {
 443                 u32 mc2 = saa7146_read(dev, MC2);
 444                 if( 0 != (mc2 & MASK_15)) {
 445                         DEB_INT(("irq: RPS1 vbi workaround (0x%08x).\n",isr));
 446                         wake_up(&dev->vv_data->vbi_wq);
 447                         saa7146_write(dev,MC2, MASK_31);
 448                         return;
 449                 }
 450                 DEB_INT(("irq: RPS1 (0x%08x).\n",isr));
 451                 saa7146_vbi_uops.irq_done(dev,isr);
 452         }
 453 }
 454
 455 static struct video_device device_template =
 456 {
 457         .hardware       = VID_HARDWARE_SAA7146,
 458         .fops           = &video_fops,
 459         .minor          = -1,
 460 };
 461
 462 int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
 463 {
 464         struct saa7146_vv *vv = kmalloc (sizeof(struct saa7146_vv),GFP_KERNEL);
 465         if( NULL == vv ) {
 466                 ERR(("out of memory. aborting.\n"));
 467                 return -1;
 468         }
 469         memset(vv, 0x0, sizeof(*vv));
 470
 471         DEB_EE(("dev:%p\n",dev));
 472
 473         /* set default values for video parts of the saa7146 */
 474         saa7146_write(dev, BCS_CTRL, 0x80400040);
 475
 476         /* enable video-port pins */
 477         saa7146_write(dev, MC1, (MASK_10 | MASK_26));
 478
 479         /* save per-device extension data (one extension can
 480            handle different devices that might need different
 481            configuration data) */
 482         dev->ext_vv_data = ext_vv;
 483
 484         vv->video_minor = -1;
 485         vv->vbi_minor = -1;
 486
 487         vv->d_clipping.cpu_addr = pci_alloc_consistent(dev->pci, SAA7146_CLIPPING_MEM, &vv->d_clipping.dma_handle);
 488         if( NULL == vv->d_clipping.cpu_addr ) {
 489                 ERR(("out of memory. aborting.\n"));
 490                 kfree(vv);
 491                 return -1;
 492         }
 493         memset(vv->d_clipping.cpu_addr, 0x0, SAA7146_CLIPPING_MEM);
 494
 495         saa7146_video_uops.init(dev,vv);
 496         saa7146_vbi_uops.init(dev,vv);
 497
 498         dev->vv_data = vv;
 499         dev->vv_callback = &vv_callback;
 500
 501         return 0;
 502 }
 503
 504 int saa7146_vv_release(struct saa7146_dev* dev)
 505 {
 506         struct saa7146_vv *vv = dev->vv_data;
 507
 508         DEB_EE(("dev:%p\n",dev));
 509
 510         pci_free_consistent(dev->pci, SAA7146_RPS_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
 511         kfree(vv);
 512         dev->vv_data = NULL;
 513         dev->vv_callback = NULL;
 514
 515         return 0;
 516 }
 517
 518 int saa7146_register_device(struct video_device *vid, struct saa7146_dev* dev, char *name, int type)
 519 {
 520         struct saa7146_vv *vv = dev->vv_data;
 521
 522         DEB_EE(("dev:%p, name:'%s', type:%d\n",dev,name,type));
 523
 524         *vid = device_template;
 525         strlcpy(vid->name, name, sizeof(vid->name));
 526         vid->priv = dev;
 527
 528         // fixme: -1 should be an insmod parameter *for the extension* (like "video_nr");
 529         if (video_register_device(vid,type,-1) < 0) {
 530                 ERR(("cannot register v4l2 device. skipping.\n"));
 531                 return -1;
 532         }
 533
 534         if( VFL_TYPE_GRABBER == type ) {
 535                 vv->video_minor = vid->minor;
 536                 INFO(("%s: registered device video%d [v4l2]\n", dev->name,vid->minor & 0x1f));
 537         } else {
 538                 vv->vbi_minor = vid->minor;
 539                 INFO(("%s: registered device vbi%d [v4l2]\n", dev->name,vid->minor & 0x1f));
 540         }
 541
 542         return 0;
 543 }
 544
 545 int saa7146_unregister_device(struct video_device *vid, struct saa7146_dev* dev)
 546 {
 547         struct saa7146_vv *vv = dev->vv_data;
 548
 549         DEB_EE(("dev:%p\n",dev));
 550
 551         if( VFL_TYPE_GRABBER == vid->type ) {
 552                 vv->video_minor = -1;
 553         } else {
 554                 vv->vbi_minor = -1;
 555         }
 556         video_unregister_device(vid);
 557
 558         return 0;
 559 }
 560
 561 static int __init saa7146_vv_init_module(void)
 562 {
 563         return 0;
 564 }
 565
 566
 567 static void __exit saa7146_vv_cleanup_module(void)
 568 {
 569 }
 570
 571 module_init(saa7146_vv_init_module);
 572 module_exit(saa7146_vv_cleanup_module);
 573
 574 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 575 MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
 576 MODULE_LICENSE("GPL");