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