drivers/media/pci/saa7164/saa7164-vbi.c

   1 /*
   2  *  Driver for the NXP SAA7164 PCIe bridge
   3  *
   4  *  Copyright (c) 2010-2015 Steven Toth <stoth@kernellabs.com>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *
  15  *  GNU General Public License for more details.
  16  */
  17
  18 #include "saa7164.h"
  19
  20 /* Take the encoder configuration from the port struct and
  21  * flush it to the hardware.
  22  */
  23 static void saa7164_vbi_configure(struct saa7164_port *port)
  24 {
  25         struct saa7164_dev *dev = port->dev;
  26         dprintk(DBGLVL_VBI, "%s()\n", __func__);
  27
  28         port->vbi_params.width = port->enc_port->width;
  29         port->vbi_params.height = port->enc_port->height;
  30         port->vbi_params.is_50hz =
  31                 (port->enc_port->encodernorm.id & V4L2_STD_625_50) != 0;
  32
  33         /* Set up the DIF (enable it) for analog mode by default */
  34         saa7164_api_initialize_dif(port);
  35         dprintk(DBGLVL_VBI, "%s() ends\n", __func__);
  36 }
  37
  38 static int saa7164_vbi_buffers_dealloc(struct saa7164_port *port)
  39 {
  40         struct list_head *c, *n, *p, *q, *l, *v;
  41         struct saa7164_dev *dev = port->dev;
  42         struct saa7164_buffer *buf;
  43         struct saa7164_user_buffer *ubuf;
  44
  45         /* Remove any allocated buffers */
  46         mutex_lock(&port->dmaqueue_lock);
  47
  48         dprintk(DBGLVL_VBI, "%s(port=%d) dmaqueue\n", __func__, port->nr);
  49         list_for_each_safe(c, n, &port->dmaqueue.list) {
  50                 buf = list_entry(c, struct saa7164_buffer, list);
  51                 list_del(c);
  52                 saa7164_buffer_dealloc(buf);
  53         }
  54
  55         dprintk(DBGLVL_VBI, "%s(port=%d) used\n", __func__, port->nr);
  56         list_for_each_safe(p, q, &port->list_buf_used.list) {
  57                 ubuf = list_entry(p, struct saa7164_user_buffer, list);
  58                 list_del(p);
  59                 saa7164_buffer_dealloc_user(ubuf);
  60         }
  61
  62         dprintk(DBGLVL_VBI, "%s(port=%d) free\n", __func__, port->nr);
  63         list_for_each_safe(l, v, &port->list_buf_free.list) {
  64                 ubuf = list_entry(l, struct saa7164_user_buffer, list);
  65                 list_del(l);
  66                 saa7164_buffer_dealloc_user(ubuf);
  67         }
  68
  69         mutex_unlock(&port->dmaqueue_lock);
  70         dprintk(DBGLVL_VBI, "%s(port=%d) done\n", __func__, port->nr);
  71
  72         return 0;
  73 }
  74
  75 /* Dynamic buffer switch at vbi start time */
  76 static int saa7164_vbi_buffers_alloc(struct saa7164_port *port)
  77 {
  78         struct saa7164_dev *dev = port->dev;
  79         struct saa7164_buffer *buf;
  80         struct saa7164_user_buffer *ubuf;
  81         struct tmHWStreamParameters *params = &port->hw_streamingparams;
  82         int result = -ENODEV, i;
  83         int len = 0;
  84
  85         dprintk(DBGLVL_VBI, "%s()\n", __func__);
  86
  87         /* TODO: NTSC SPECIFIC */
  88         /* Init and establish defaults */
  89         params->samplesperline = 1440;
  90         params->numberoflines = 12;
  91         params->numberoflines = 18;
  92         params->pitch = 1600;
  93         params->pitch = 1440;
  94         params->numpagetables = 2 +
  95                 ((params->numberoflines * params->pitch) / PAGE_SIZE);
  96         params->bitspersample = 8;
  97         params->linethreshold = 0;
  98         params->pagetablelistvirt = NULL;
  99         params->pagetablelistphys = NULL;
 100         params->numpagetableentries = port->hwcfg.buffercount;
 101
 102         /* Allocate the PCI resources, buffers (hard) */
 103         for (i = 0; i < port->hwcfg.buffercount; i++) {
 104                 buf = saa7164_buffer_alloc(port,
 105                         params->numberoflines *
 106                         params->pitch);
 107
 108                 if (!buf) {
 109                         printk(KERN_ERR "%s() failed (errno = %d), unable to allocate buffer\n",
 110                                 __func__, result);
 111                         result = -ENOMEM;
 112                         goto failed;
 113                 } else {
 114
 115                         mutex_lock(&port->dmaqueue_lock);
 116                         list_add_tail(&buf->list, &port->dmaqueue.list);
 117                         mutex_unlock(&port->dmaqueue_lock);
 118
 119                 }
 120         }
 121
 122         /* Allocate some kernel buffers for copying
 123          * to userpsace.
 124          */
 125         len = params->numberoflines * params->pitch;
 126
 127         if (vbi_buffers < 16)
 128                 vbi_buffers = 16;
 129         if (vbi_buffers > 512)
 130                 vbi_buffers = 512;
 131
 132         for (i = 0; i < vbi_buffers; i++) {
 133
 134                 ubuf = saa7164_buffer_alloc_user(dev, len);
 135                 if (ubuf) {
 136                         mutex_lock(&port->dmaqueue_lock);
 137                         list_add_tail(&ubuf->list, &port->list_buf_free.list);
 138                         mutex_unlock(&port->dmaqueue_lock);
 139                 }
 140
 141         }
 142
 143         result = 0;
 144
 145 failed:
 146         return result;
 147 }
 148
 149
 150 static int saa7164_vbi_initialize(struct saa7164_port *port)
 151 {
 152         saa7164_vbi_configure(port);
 153         return 0;
 154 }
 155
 156 /* -- V4L2 --------------------------------------------------------- */
 157 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id id)
 158 {
 159         struct saa7164_vbi_fh *fh = file->private_data;
 160
 161         return saa7164_s_std(fh->port->enc_port, id);
 162 }
 163
 164 static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *id)
 165 {
 166         struct saa7164_encoder_fh *fh = file->private_data;
 167
 168         return saa7164_g_std(fh->port->enc_port, id);
 169 }
 170
 171 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
 172 {
 173         struct saa7164_vbi_fh *fh = file->private_data;
 174
 175         return saa7164_g_input(fh->port->enc_port, i);
 176 }
 177
 178 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
 179 {
 180         struct saa7164_vbi_fh *fh = file->private_data;
 181
 182         return saa7164_s_input(fh->port->enc_port, i);
 183 }
 184
 185 static int vidioc_g_frequency(struct file *file, void *priv,
 186         struct v4l2_frequency *f)
 187 {
 188         struct saa7164_vbi_fh *fh = file->private_data;
 189
 190         return saa7164_g_frequency(fh->port->enc_port, f);
 191 }
 192
 193 static int vidioc_s_frequency(struct file *file, void *priv,
 194         const struct v4l2_frequency *f)
 195 {
 196         struct saa7164_vbi_fh *fh = file->private_data;
 197         int ret = saa7164_s_frequency(fh->port->enc_port, f);
 198
 199         if (ret == 0)
 200                 saa7164_vbi_initialize(fh->port);
 201         return ret;
 202 }
 203
 204 static int vidioc_querycap(struct file *file, void  *priv,
 205         struct v4l2_capability *cap)
 206 {
 207         struct saa7164_vbi_fh *fh = file->private_data;
 208         struct saa7164_port *port = fh->port;
 209         struct saa7164_dev *dev = port->dev;
 210
 211         strcpy(cap->driver, dev->name);
 212         strlcpy(cap->card, saa7164_boards[dev->board].name,
 213                 sizeof(cap->card));
 214         sprintf(cap->bus_info, "PCI:%s", pci_name(dev->pci));
 215
 216         cap->device_caps =
 217                 V4L2_CAP_VBI_CAPTURE |
 218                 V4L2_CAP_READWRITE |
 219                 V4L2_CAP_TUNER;
 220
 221         cap->capabilities = cap->device_caps |
 222                 V4L2_CAP_VIDEO_CAPTURE |
 223                 V4L2_CAP_DEVICE_CAPS;
 224
 225         return 0;
 226 }
 227
 228 static int saa7164_vbi_stop_port(struct saa7164_port *port)
 229 {
 230         struct saa7164_dev *dev = port->dev;
 231         int ret;
 232
 233         ret = saa7164_api_transition_port(port, SAA_DMASTATE_STOP);
 234         if ((ret != SAA_OK) && (ret != SAA_ERR_ALREADY_STOPPED)) {
 235                 printk(KERN_ERR "%s() stop transition failed, ret = 0x%x\n",
 236                         __func__, ret);
 237                 ret = -EIO;
 238         } else {
 239                 dprintk(DBGLVL_VBI, "%s()    Stopped\n", __func__);
 240                 ret = 0;
 241         }
 242
 243         return ret;
 244 }
 245
 246 static int saa7164_vbi_acquire_port(struct saa7164_port *port)
 247 {
 248         struct saa7164_dev *dev = port->dev;
 249         int ret;
 250
 251         ret = saa7164_api_transition_port(port, SAA_DMASTATE_ACQUIRE);
 252         if ((ret != SAA_OK) && (ret != SAA_ERR_ALREADY_STOPPED)) {
 253                 printk(KERN_ERR "%s() acquire transition failed, ret = 0x%x\n",
 254                         __func__, ret);
 255                 ret = -EIO;
 256         } else {
 257                 dprintk(DBGLVL_VBI, "%s() Acquired\n", __func__);
 258                 ret = 0;
 259         }
 260
 261         return ret;
 262 }
 263
 264 static int saa7164_vbi_pause_port(struct saa7164_port *port)
 265 {
 266         struct saa7164_dev *dev = port->dev;
 267         int ret;
 268
 269         ret = saa7164_api_transition_port(port, SAA_DMASTATE_PAUSE);
 270         if ((ret != SAA_OK) && (ret != SAA_ERR_ALREADY_STOPPED)) {
 271                 printk(KERN_ERR "%s() pause transition failed, ret = 0x%x\n",
 272                         __func__, ret);
 273                 ret = -EIO;
 274         } else {
 275                 dprintk(DBGLVL_VBI, "%s()   Paused\n", __func__);
 276                 ret = 0;
 277         }
 278
 279         return ret;
 280 }
 281
 282 /* Firmware is very windows centric, meaning you have to transition
 283  * the part through AVStream / KS Windows stages, forwards or backwards.
 284  * States are: stopped, acquired (h/w), paused, started.
 285  * We have to leave here will all of the soft buffers on the free list,
 286  * else the cfg_post() func won't have soft buffers to correctly configure.
 287  */
 288 static int saa7164_vbi_stop_streaming(struct saa7164_port *port)
 289 {
 290         struct saa7164_dev *dev = port->dev;
 291         struct saa7164_buffer *buf;
 292         struct saa7164_user_buffer *ubuf;
 293         struct list_head *c, *n;
 294         int ret;
 295
 296         dprintk(DBGLVL_VBI, "%s(port=%d)\n", __func__, port->nr);
 297
 298         ret = saa7164_vbi_pause_port(port);
 299         ret = saa7164_vbi_acquire_port(port);
 300         ret = saa7164_vbi_stop_port(port);
 301
 302         dprintk(DBGLVL_VBI, "%s(port=%d) Hardware stopped\n", __func__,
 303                 port->nr);
 304
 305         /* Reset the state of any allocated buffer resources */
 306         mutex_lock(&port->dmaqueue_lock);
 307
 308         /* Reset the hard and soft buffer state */
 309         list_for_each_safe(c, n, &port->dmaqueue.list) {
 310                 buf = list_entry(c, struct saa7164_buffer, list);
 311                 buf->flags = SAA7164_BUFFER_FREE;
 312                 buf->pos = 0;
 313         }
 314
 315         list_for_each_safe(c, n, &port->list_buf_used.list) {
 316                 ubuf = list_entry(c, struct saa7164_user_buffer, list);
 317                 ubuf->pos = 0;
 318                 list_move_tail(&ubuf->list, &port->list_buf_free.list);
 319         }
 320
 321         mutex_unlock(&port->dmaqueue_lock);
 322
 323         /* Free any allocated resources */
 324         saa7164_vbi_buffers_dealloc(port);
 325
 326         dprintk(DBGLVL_VBI, "%s(port=%d) Released\n", __func__, port->nr);
 327
 328         return ret;
 329 }
 330
 331 static int saa7164_vbi_start_streaming(struct saa7164_port *port)
 332 {
 333         struct saa7164_dev *dev = port->dev;
 334         int result, ret = 0;
 335
 336         dprintk(DBGLVL_VBI, "%s(port=%d)\n", __func__, port->nr);
 337
 338         port->done_first_interrupt = 0;
 339
 340         /* allocate all of the PCIe DMA buffer resources on the fly,
 341          * allowing switching between TS and PS payloads without
 342          * requiring a complete driver reload.
 343          */
 344         saa7164_vbi_buffers_alloc(port);
 345
 346         /* Configure the encoder with any cache values */
 347 #if 0
 348         saa7164_api_set_encoder(port);
 349         saa7164_api_get_encoder(port);
 350 #endif
 351
 352         /* Place the empty buffers on the hardware */
 353         saa7164_buffer_cfg_port(port);
 354
 355         /* Negotiate format */
 356         if (saa7164_api_set_vbi_format(port) != SAA_OK) {
 357                 printk(KERN_ERR "%s() No supported VBI format\n", __func__);
 358                 ret = -EIO;
 359                 goto out;
 360         }
 361
 362         /* Acquire the hardware */
 363         result = saa7164_api_transition_port(port, SAA_DMASTATE_ACQUIRE);
 364         if ((result != SAA_OK) && (result != SAA_ERR_ALREADY_STOPPED)) {
 365                 printk(KERN_ERR "%s() acquire transition failed, res = 0x%x\n",
 366                         __func__, result);
 367
 368                 ret = -EIO;
 369                 goto out;
 370         } else
 371                 dprintk(DBGLVL_VBI, "%s()   Acquired\n", __func__);
 372
 373         /* Pause the hardware */
 374         result = saa7164_api_transition_port(port, SAA_DMASTATE_PAUSE);
 375         if ((result != SAA_OK) && (result != SAA_ERR_ALREADY_STOPPED)) {
 376                 printk(KERN_ERR "%s() pause transition failed, res = 0x%x\n",
 377                                 __func__, result);
 378
 379                 /* Stop the hardware, regardless */
 380                 result = saa7164_vbi_stop_port(port);
 381                 if (result != SAA_OK) {
 382                         printk(KERN_ERR "%s() pause/forced stop transition failed, res = 0x%x\n",
 383                                __func__, result);
 384                 }
 385
 386                 ret = -EIO;
 387                 goto out;
 388         } else
 389                 dprintk(DBGLVL_VBI, "%s()   Paused\n", __func__);
 390
 391         /* Start the hardware */
 392         result = saa7164_api_transition_port(port, SAA_DMASTATE_RUN);
 393         if ((result != SAA_OK) && (result != SAA_ERR_ALREADY_STOPPED)) {
 394                 printk(KERN_ERR "%s() run transition failed, result = 0x%x\n",
 395                                 __func__, result);
 396
 397                 /* Stop the hardware, regardless */
 398                 result = saa7164_vbi_acquire_port(port);
 399                 result = saa7164_vbi_stop_port(port);
 400                 if (result != SAA_OK) {
 401                         printk(KERN_ERR "%s() run/forced stop transition failed, res = 0x%x\n",
 402                                __func__, result);
 403                 }
 404
 405                 ret = -EIO;
 406         } else
 407                 dprintk(DBGLVL_VBI, "%s()   Running\n", __func__);
 408
 409 out:
 410         return ret;
 411 }
 412
 413 static int saa7164_vbi_fmt(struct file *file, void *priv,
 414                            struct v4l2_format *f)
 415 {
 416         /* ntsc */
 417         f->fmt.vbi.samples_per_line = 1440;
 418         f->fmt.vbi.sampling_rate = 27000000;
 419         f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
 420         f->fmt.vbi.offset = 0;
 421         f->fmt.vbi.flags = 0;
 422         f->fmt.vbi.start[0] = 10;
 423         f->fmt.vbi.count[0] = 18;
 424         f->fmt.vbi.start[1] = 263 + 10 + 1;
 425         f->fmt.vbi.count[1] = 18;
 426         memset(f->fmt.vbi.reserved, 0, sizeof(f->fmt.vbi.reserved));
 427         return 0;
 428 }
 429
 430 static int fops_open(struct file *file)
 431 {
 432         struct saa7164_dev *dev;
 433         struct saa7164_port *port;
 434         struct saa7164_vbi_fh *fh;
 435
 436         port = (struct saa7164_port *)video_get_drvdata(video_devdata(file));
 437         if (!port)
 438                 return -ENODEV;
 439
 440         dev = port->dev;
 441
 442         dprintk(DBGLVL_VBI, "%s()\n", __func__);
 443
 444         /* allocate + initialize per filehandle data */
 445         fh = kzalloc(sizeof(*fh), GFP_KERNEL);
 446         if (NULL == fh)
 447                 return -ENOMEM;
 448
 449         fh->port = port;
 450         v4l2_fh_init(&fh->fh, video_devdata(file));
 451         v4l2_fh_add(&fh->fh);
 452         file->private_data = fh;
 453
 454         return 0;
 455 }
 456
 457 static int fops_release(struct file *file)
 458 {
 459         struct saa7164_vbi_fh *fh = file->private_data;
 460         struct saa7164_port *port = fh->port;
 461         struct saa7164_dev *dev = port->dev;
 462
 463         dprintk(DBGLVL_VBI, "%s()\n", __func__);
 464
 465         /* Shut device down on last close */
 466         if (atomic_cmpxchg(&fh->v4l_reading, 1, 0) == 1) {
 467                 if (atomic_dec_return(&port->v4l_reader_count) == 0) {
 468                         /* stop vbi capture then cancel buffers */
 469                         saa7164_vbi_stop_streaming(port);
 470                 }
 471         }
 472
 473         v4l2_fh_del(&fh->fh);
 474         v4l2_fh_exit(&fh->fh);
 475         kfree(fh);
 476
 477         return 0;
 478 }
 479
 480 static struct
 481 saa7164_user_buffer *saa7164_vbi_next_buf(struct saa7164_port *port)
 482 {
 483         struct saa7164_user_buffer *ubuf = NULL;
 484         struct saa7164_dev *dev = port->dev;
 485         u32 crc;
 486
 487         mutex_lock(&port->dmaqueue_lock);
 488         if (!list_empty(&port->list_buf_used.list)) {
 489                 ubuf = list_first_entry(&port->list_buf_used.list,
 490                         struct saa7164_user_buffer, list);
 491
 492                 if (crc_checking) {
 493                         crc = crc32(0, ubuf->data, ubuf->actual_size);
 494                         if (crc != ubuf->crc) {
 495                                 printk(KERN_ERR "%s() ubuf %p crc became invalid, was 0x%x became 0x%x\n",
 496                                         __func__,
 497                                         ubuf, ubuf->crc, crc);
 498                         }
 499                 }
 500
 501         }
 502         mutex_unlock(&port->dmaqueue_lock);
 503
 504         dprintk(DBGLVL_VBI, "%s() returns %p\n", __func__, ubuf);
 505
 506         return ubuf;
 507 }
 508
 509 static ssize_t fops_read(struct file *file, char __user *buffer,
 510         size_t count, loff_t *pos)
 511 {
 512         struct saa7164_vbi_fh *fh = file->private_data;
 513         struct saa7164_port *port = fh->port;
 514         struct saa7164_user_buffer *ubuf = NULL;
 515         struct saa7164_dev *dev = port->dev;
 516         int ret = 0;
 517         int rem, cnt;
 518         u8 *p;
 519
 520         port->last_read_msecs_diff = port->last_read_msecs;
 521         port->last_read_msecs = jiffies_to_msecs(jiffies);
 522         port->last_read_msecs_diff = port->last_read_msecs -
 523                 port->last_read_msecs_diff;
 524
 525         saa7164_histogram_update(&port->read_interval,
 526                 port->last_read_msecs_diff);
 527
 528         if (*pos) {
 529                 printk(KERN_ERR "%s() ESPIPE\n", __func__);
 530                 return -ESPIPE;
 531         }
 532
 533         if (atomic_cmpxchg(&fh->v4l_reading, 0, 1) == 0) {
 534                 if (atomic_inc_return(&port->v4l_reader_count) == 1) {
 535
 536                         if (saa7164_vbi_initialize(port) < 0) {
 537                                 printk(KERN_ERR "%s() EINVAL\n", __func__);
 538                                 return -EINVAL;
 539                         }
 540
 541                         saa7164_vbi_start_streaming(port);
 542                         msleep(200);
 543                 }
 544         }
 545
 546         /* blocking wait for buffer */
 547         if ((file->f_flags & O_NONBLOCK) == 0) {
 548                 if (wait_event_interruptible(port->wait_read,
 549                         saa7164_vbi_next_buf(port))) {
 550                                 printk(KERN_ERR "%s() ERESTARTSYS\n", __func__);
 551                                 return -ERESTARTSYS;
 552                 }
 553         }
 554
 555         /* Pull the first buffer from the used list */
 556         ubuf = saa7164_vbi_next_buf(port);
 557
 558         while ((count > 0) && ubuf) {
 559
 560                 /* set remaining bytes to copy */
 561                 rem = ubuf->actual_size - ubuf->pos;
 562                 cnt = rem > count ? count : rem;
 563
 564                 p = ubuf->data + ubuf->pos;
 565
 566                 dprintk(DBGLVL_VBI,
 567                         "%s() count=%d cnt=%d rem=%d buf=%p buf->pos=%d\n",
 568                         __func__, (int)count, cnt, rem, ubuf, ubuf->pos);
 569
 570                 if (copy_to_user(buffer, p, cnt)) {
 571                         printk(KERN_ERR "%s() copy_to_user failed\n", __func__);
 572                         if (!ret) {
 573                                 printk(KERN_ERR "%s() EFAULT\n", __func__);
 574                                 ret = -EFAULT;
 575                         }
 576                         goto err;
 577                 }
 578
 579                 ubuf->pos += cnt;
 580                 count -= cnt;
 581                 buffer += cnt;
 582                 ret += cnt;
 583
 584                 if (ubuf->pos > ubuf->actual_size)
 585                         printk(KERN_ERR "read() pos > actual, huh?\n");
 586
 587                 if (ubuf->pos == ubuf->actual_size) {
 588
 589                         /* finished with current buffer, take next buffer */
 590
 591                         /* Requeue the buffer on the free list */
 592                         ubuf->pos = 0;
 593
 594                         mutex_lock(&port->dmaqueue_lock);
 595                         list_move_tail(&ubuf->list, &port->list_buf_free.list);
 596                         mutex_unlock(&port->dmaqueue_lock);
 597
 598                         /* Dequeue next */
 599                         if ((file->f_flags & O_NONBLOCK) == 0) {
 600                                 if (wait_event_interruptible(port->wait_read,
 601                                         saa7164_vbi_next_buf(port))) {
 602                                                 break;
 603                                 }
 604                         }
 605                         ubuf = saa7164_vbi_next_buf(port);
 606                 }
 607         }
 608 err:
 609         if (!ret && !ubuf) {
 610                 printk(KERN_ERR "%s() EAGAIN\n", __func__);
 611                 ret = -EAGAIN;
 612         }
 613
 614         return ret;
 615 }
 616
 617 static __poll_t fops_poll(struct file *file, poll_table *wait)
 618 {
 619         struct saa7164_vbi_fh *fh = (struct saa7164_vbi_fh *)file->private_data;
 620         struct saa7164_port *port = fh->port;
 621         __poll_t mask = 0;
 622
 623         port->last_poll_msecs_diff = port->last_poll_msecs;
 624         port->last_poll_msecs = jiffies_to_msecs(jiffies);
 625         port->last_poll_msecs_diff = port->last_poll_msecs -
 626                 port->last_poll_msecs_diff;
 627
 628         saa7164_histogram_update(&port->poll_interval,
 629                 port->last_poll_msecs_diff);
 630
 631         if (!video_is_registered(port->v4l_device))
 632                 return -EIO;
 633
 634         if (atomic_cmpxchg(&fh->v4l_reading, 0, 1) == 0) {
 635                 if (atomic_inc_return(&port->v4l_reader_count) == 1) {
 636                         if (saa7164_vbi_initialize(port) < 0)
 637                                 return -EINVAL;
 638                         saa7164_vbi_start_streaming(port);
 639                         msleep(200);
 640                 }
 641         }
 642
 643         /* blocking wait for buffer */
 644         if ((file->f_flags & O_NONBLOCK) == 0) {
 645                 if (wait_event_interruptible(port->wait_read,
 646                         saa7164_vbi_next_buf(port))) {
 647                                 return -ERESTARTSYS;
 648                 }
 649         }
 650
 651         /* Pull the first buffer from the used list */
 652         if (!list_empty(&port->list_buf_used.list))
 653                 mask |= EPOLLIN | EPOLLRDNORM;
 654
 655         return mask;
 656 }
 657 static const struct v4l2_file_operations vbi_fops = {
 658         .owner          = THIS_MODULE,
 659         .open           = fops_open,
 660         .release        = fops_release,
 661         .read           = fops_read,
 662         .poll           = fops_poll,
 663         .unlocked_ioctl = video_ioctl2,
 664 };
 665
 666 static const struct v4l2_ioctl_ops vbi_ioctl_ops = {
 667         .vidioc_s_std            = vidioc_s_std,
 668         .vidioc_g_std            = vidioc_g_std,
 669         .vidioc_enum_input       = saa7164_enum_input,
 670         .vidioc_g_input          = vidioc_g_input,
 671         .vidioc_s_input          = vidioc_s_input,
 672         .vidioc_g_tuner          = saa7164_g_tuner,
 673         .vidioc_s_tuner          = saa7164_s_tuner,
 674         .vidioc_g_frequency      = vidioc_g_frequency,
 675         .vidioc_s_frequency      = vidioc_s_frequency,
 676         .vidioc_querycap         = vidioc_querycap,
 677         .vidioc_g_fmt_vbi_cap    = saa7164_vbi_fmt,
 678         .vidioc_try_fmt_vbi_cap  = saa7164_vbi_fmt,
 679         .vidioc_s_fmt_vbi_cap    = saa7164_vbi_fmt,
 680 };
 681
 682 static struct video_device saa7164_vbi_template = {
 683         .name          = "saa7164",
 684         .fops          = &vbi_fops,
 685         .ioctl_ops     = &vbi_ioctl_ops,
 686         .minor         = -1,
 687         .tvnorms       = SAA7164_NORMS,
 688 };
 689
 690 static struct video_device *saa7164_vbi_alloc(
 691         struct saa7164_port *port,
 692         struct pci_dev *pci,
 693         struct video_device *template,
 694         char *type)
 695 {
 696         struct video_device *vfd;
 697         struct saa7164_dev *dev = port->dev;
 698
 699         dprintk(DBGLVL_VBI, "%s()\n", __func__);
 700
 701         vfd = video_device_alloc();
 702         if (NULL == vfd)
 703                 return NULL;
 704
 705         *vfd = *template;
 706         snprintf(vfd->name, sizeof(vfd->name), "%s %s (%s)", dev->name,
 707                 type, saa7164_boards[dev->board].name);
 708
 709         vfd->v4l2_dev  = &dev->v4l2_dev;
 710         vfd->release = video_device_release;
 711         return vfd;
 712 }
 713
 714 int saa7164_vbi_register(struct saa7164_port *port)
 715 {
 716         struct saa7164_dev *dev = port->dev;
 717         int result = -ENODEV;
 718
 719         dprintk(DBGLVL_VBI, "%s()\n", __func__);
 720
 721         if (port->type != SAA7164_MPEG_VBI)
 722                 BUG();
 723
 724         /* Sanity check that the PCI configuration space is active */
 725         if (port->hwcfg.BARLocation == 0) {
 726                 printk(KERN_ERR "%s() failed (errno = %d), NO PCI configuration\n",
 727                         __func__, result);
 728                 result = -ENOMEM;
 729                 goto failed;
 730         }
 731
 732         /* Establish VBI defaults here */
 733
 734         /* Allocate and register the video device node */
 735         port->v4l_device = saa7164_vbi_alloc(port,
 736                 dev->pci, &saa7164_vbi_template, "vbi");
 737
 738         if (!port->v4l_device) {
 739                 printk(KERN_INFO "%s: can't allocate vbi device\n",
 740                         dev->name);
 741                 result = -ENOMEM;
 742                 goto failed;
 743         }
 744
 745         port->enc_port = &dev->ports[port->nr - 2];
 746         video_set_drvdata(port->v4l_device, port);
 747         result = video_register_device(port->v4l_device,
 748                 VFL_TYPE_VBI, -1);
 749         if (result < 0) {
 750                 printk(KERN_INFO "%s: can't register vbi device\n",
 751                         dev->name);
 752                 /* TODO: We're going to leak here if we don't dealloc
 753                  The buffers above. The unreg function can't deal wit it.
 754                 */
 755                 goto failed;
 756         }
 757
 758         printk(KERN_INFO "%s: registered device vbi%d [vbi]\n",
 759                 dev->name, port->v4l_device->num);
 760
 761         /* Configure the hardware defaults */
 762
 763         result = 0;
 764 failed:
 765         return result;
 766 }
 767
 768 void saa7164_vbi_unregister(struct saa7164_port *port)
 769 {
 770         struct saa7164_dev *dev = port->dev;
 771
 772         dprintk(DBGLVL_VBI, "%s(port=%d)\n", __func__, port->nr);
 773
 774         if (port->type != SAA7164_MPEG_VBI)
 775                 BUG();
 776
 777         if (port->v4l_device) {
 778                 if (port->v4l_device->minor != -1)
 779                         video_unregister_device(port->v4l_device);
 780                 else
 781                         video_device_release(port->v4l_device);
 782
 783                 port->v4l_device = NULL;
 784         }
 785
 786 }