linux/drivers/media/common/saa7146_fops.c
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   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
   8int 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        mutex_lock(&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                mutex_unlock(&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        mutex_unlock(&dev->lock);
  32        return 1;
  33}
  34
  35void saa7146_res_free(struct saa7146_fh *fh, unsigned int bits)
  36{
  37        struct saa7146_dev *dev = fh->dev;
  38        struct saa7146_vv *vv = dev->vv_data;
  39
  40        BUG_ON((fh->resources & bits) != bits);
  41
  42        mutex_lock(&dev->lock);
  43        fh->resources  &= ~bits;
  44        vv->resources &= ~bits;
  45        DEB_D(("res: put 0x%02x, cur:0x%02x\n",bits,vv->resources));
  46        mutex_unlock(&dev->lock);
  47}
  48
  49
  50/********************************************************************************/
  51/* common dma functions */
  52
  53void saa7146_dma_free(struct saa7146_dev *dev,struct videobuf_queue *q,
  54                                                struct saa7146_buf *buf)
  55{
  56        struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
  57        DEB_EE(("dev:%p, buf:%p\n",dev,buf));
  58
  59        BUG_ON(in_interrupt());
  60
  61        videobuf_waiton(&buf->vb,0,0);
  62        videobuf_dma_unmap(q, dma);
  63        videobuf_dma_free(dma);
  64        buf->vb.state = VIDEOBUF_NEEDS_INIT;
  65}
  66
  67
  68/********************************************************************************/
  69/* common buffer functions */
  70
  71int saa7146_buffer_queue(struct saa7146_dev *dev,
  72                         struct saa7146_dmaqueue *q,
  73                         struct saa7146_buf *buf)
  74{
  75        assert_spin_locked(&dev->slock);
  76        DEB_EE(("dev:%p, dmaq:%p, buf:%p\n", dev, q, buf));
  77
  78        BUG_ON(!q);
  79
  80        if (NULL == q->curr) {
  81                q->curr = buf;
  82                DEB_D(("immediately activating buffer %p\n", buf));
  83                buf->activate(dev,buf,NULL);
  84        } else {
  85                list_add_tail(&buf->vb.queue,&q->queue);
  86                buf->vb.state = VIDEOBUF_QUEUED;
  87                DEB_D(("adding buffer %p to queue. (active buffer present)\n", buf));
  88        }
  89        return 0;
  90}
  91
  92void saa7146_buffer_finish(struct saa7146_dev *dev,
  93                           struct saa7146_dmaqueue *q,
  94                           int state)
  95{
  96        assert_spin_locked(&dev->slock);
  97        DEB_EE(("dev:%p, dmaq:%p, state:%d\n", dev, q, state));
  98        DEB_EE(("q->curr:%p\n",q->curr));
  99
 100        BUG_ON(!q->curr);
 101
 102        /* finish current buffer */
 103        if (NULL == q->curr) {
 104                DEB_D(("aiii. no current buffer\n"));
 105                return;
 106        }
 107
 108        q->curr->vb.state = state;
 109        do_gettimeofday(&q->curr->vb.ts);
 110        wake_up(&q->curr->vb.done);
 111
 112        q->curr = NULL;
 113}
 114
 115void saa7146_buffer_next(struct saa7146_dev *dev,
 116                         struct saa7146_dmaqueue *q, int vbi)
 117{
 118        struct saa7146_buf *buf,*next = NULL;
 119
 120        BUG_ON(!q);
 121
 122        DEB_INT(("dev:%p, dmaq:%p, vbi:%d\n", dev, q, vbi));
 123
 124        assert_spin_locked(&dev->slock);
 125        if (!list_empty(&q->queue)) {
 126                /* activate next one from queue */
 127                buf = list_entry(q->queue.next,struct saa7146_buf,vb.queue);
 128                list_del(&buf->vb.queue);
 129                if (!list_empty(&q->queue))
 130                        next = list_entry(q->queue.next,struct saa7146_buf, vb.queue);
 131                q->curr = buf;
 132                DEB_INT(("next buffer: buf:%p, prev:%p, next:%p\n", buf, q->queue.prev,q->queue.next));
 133                buf->activate(dev,buf,next);
 134        } else {
 135                DEB_INT(("no next buffer. stopping.\n"));
 136                if( 0 != vbi ) {
 137                        /* turn off video-dma3 */
 138                        saa7146_write(dev,MC1, MASK_20);
 139                } else {
 140                        /* nothing to do -- just prevent next video-dma1 transfer
 141                           by lowering the protection address */
 142
 143                        // fixme: fix this for vflip != 0
 144
 145                        saa7146_write(dev, PROT_ADDR1, 0);
 146                        saa7146_write(dev, MC2, (MASK_02|MASK_18));
 147
 148                        /* write the address of the rps-program */
 149                        saa7146_write(dev, RPS_ADDR0, dev->d_rps0.dma_handle);
 150                        /* turn on rps */
 151                        saa7146_write(dev, MC1, (MASK_12 | MASK_28));
 152
 153/*
 154                        printk("vdma%d.base_even:     0x%08x\n", 1,saa7146_read(dev,BASE_EVEN1));
 155                        printk("vdma%d.base_odd:      0x%08x\n", 1,saa7146_read(dev,BASE_ODD1));
 156                        printk("vdma%d.prot_addr:     0x%08x\n", 1,saa7146_read(dev,PROT_ADDR1));
 157                        printk("vdma%d.base_page:     0x%08x\n", 1,saa7146_read(dev,BASE_PAGE1));
 158                        printk("vdma%d.pitch:         0x%08x\n", 1,saa7146_read(dev,PITCH1));
 159                        printk("vdma%d.num_line_byte: 0x%08x\n", 1,saa7146_read(dev,NUM_LINE_BYTE1));
 160*/
 161                }
 162                del_timer(&q->timeout);
 163        }
 164}
 165
 166void saa7146_buffer_timeout(unsigned long data)
 167{
 168        struct saa7146_dmaqueue *q = (struct saa7146_dmaqueue*)data;
 169        struct saa7146_dev *dev = q->dev;
 170        unsigned long flags;
 171
 172        DEB_EE(("dev:%p, dmaq:%p\n", dev, q));
 173
 174        spin_lock_irqsave(&dev->slock,flags);
 175        if (q->curr) {
 176                DEB_D(("timeout on %p\n", q->curr));
 177                saa7146_buffer_finish(dev,q,VIDEOBUF_ERROR);
 178        }
 179
 180        /* we don't restart the transfer here like other drivers do. when
 181           a streaming capture is disabled, the timeout function will be
 182           called for the current buffer. if we activate the next buffer now,
 183           we mess up our capture logic. if a timeout occurs on another buffer,
 184           then something is seriously broken before, so no need to buffer the
 185           next capture IMHO... */
 186/*
 187        saa7146_buffer_next(dev,q);
 188*/
 189        spin_unlock_irqrestore(&dev->slock,flags);
 190}
 191
 192/********************************************************************************/
 193/* file operations */
 194
 195static int fops_open(struct inode *inode, struct file *file)
 196{
 197        unsigned int minor = iminor(inode);
 198        struct saa7146_dev *h = NULL, *dev = NULL;
 199        struct list_head *list;
 200        struct saa7146_fh *fh = NULL;
 201        int result = 0;
 202
 203        enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 204
 205        DEB_EE(("inode:%p, file:%p, minor:%d\n",inode,file,minor));
 206
 207        if (mutex_lock_interruptible(&saa7146_devices_lock))
 208                return -ERESTARTSYS;
 209
 210        list_for_each(list,&saa7146_devices) {
 211                h = list_entry(list, struct saa7146_dev, item);
 212                if( NULL == h->vv_data ) {
 213                        DEB_D(("device %p has not registered video devices.\n",h));
 214                        continue;
 215                }
 216                DEB_D(("trying: %p @ major %d,%d\n",h,h->vv_data->video_minor,h->vv_data->vbi_minor));
 217
 218                if (h->vv_data->video_minor == minor) {
 219                        dev = h;
 220                }
 221                if (h->vv_data->vbi_minor == minor) {
 222                        type = V4L2_BUF_TYPE_VBI_CAPTURE;
 223                        dev = h;
 224                }
 225        }
 226        if (NULL == dev) {
 227                DEB_S(("no such video device.\n"));
 228                result = -ENODEV;
 229                goto out;
 230        }
 231
 232        DEB_D(("using: %p\n",dev));
 233
 234        /* check if an extension is registered */
 235        if( NULL == dev->ext ) {
 236                DEB_S(("no extension registered for this device.\n"));
 237                result = -ENODEV;
 238                goto out;
 239        }
 240
 241        /* allocate per open data */
 242        fh = kzalloc(sizeof(*fh),GFP_KERNEL);
 243        if (NULL == fh) {
 244                DEB_S(("cannot allocate memory for per open data.\n"));
 245                result = -ENOMEM;
 246                goto out;
 247        }
 248
 249        file->private_data = fh;
 250        fh->dev = dev;
 251        fh->type = type;
 252
 253        if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 254                DEB_S(("initializing vbi...\n"));
 255                if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 256                        result = saa7146_vbi_uops.open(dev,file);
 257                if (dev->ext_vv_data->vbi_fops.open)
 258                        dev->ext_vv_data->vbi_fops.open(inode, file);
 259        } else {
 260                DEB_S(("initializing video...\n"));
 261                result = saa7146_video_uops.open(dev,file);
 262        }
 263
 264        if (0 != result) {
 265                goto out;
 266        }
 267
 268        if( 0 == try_module_get(dev->ext->module)) {
 269                result = -EINVAL;
 270                goto out;
 271        }
 272
 273        result = 0;
 274out:
 275        if (fh && result != 0) {
 276                kfree(fh);
 277                file->private_data = NULL;
 278        }
 279        mutex_unlock(&saa7146_devices_lock);
 280        return result;
 281}
 282
 283static int fops_release(struct inode *inode, struct file *file)
 284{
 285        struct saa7146_fh  *fh  = file->private_data;
 286        struct saa7146_dev *dev = fh->dev;
 287
 288        DEB_EE(("inode:%p, file:%p\n",inode,file));
 289
 290        if (mutex_lock_interruptible(&saa7146_devices_lock))
 291                return -ERESTARTSYS;
 292
 293        if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 294                if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 295                        saa7146_vbi_uops.release(dev,file);
 296                if (dev->ext_vv_data->vbi_fops.release)
 297                        dev->ext_vv_data->vbi_fops.release(inode, file);
 298        } else {
 299                saa7146_video_uops.release(dev,file);
 300        }
 301
 302        module_put(dev->ext->module);
 303        file->private_data = NULL;
 304        kfree(fh);
 305
 306        mutex_unlock(&saa7146_devices_lock);
 307
 308        return 0;
 309}
 310
 311static int fops_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 312{
 313/*
 314        DEB_EE(("inode:%p, file:%p, cmd:%d, arg:%li\n",inode, file, cmd, arg));
 315*/
 316        return video_usercopy(inode, file, cmd, arg, saa7146_video_do_ioctl);
 317}
 318
 319static int fops_mmap(struct file *file, struct vm_area_struct * vma)
 320{
 321        struct saa7146_fh *fh = file->private_data;
 322        struct videobuf_queue *q;
 323
 324        switch (fh->type) {
 325        case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 326                DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, vma:%p\n",file, vma));
 327                q = &fh->video_q;
 328                break;
 329                }
 330        case V4L2_BUF_TYPE_VBI_CAPTURE: {
 331                DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, vma:%p\n",file, vma));
 332                q = &fh->vbi_q;
 333                break;
 334                }
 335        default:
 336                BUG();
 337                return 0;
 338        }
 339
 340        return videobuf_mmap_mapper(q,vma);
 341}
 342
 343static unsigned int fops_poll(struct file *file, struct poll_table_struct *wait)
 344{
 345        struct saa7146_fh *fh = file->private_data;
 346        struct videobuf_buffer *buf = NULL;
 347        struct videobuf_queue *q;
 348
 349        DEB_EE(("file:%p, poll:%p\n",file, wait));
 350
 351        if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) {
 352                if( 0 == fh->vbi_q.streaming )
 353                        return videobuf_poll_stream(file, &fh->vbi_q, wait);
 354                q = &fh->vbi_q;
 355        } else {
 356                DEB_D(("using video queue.\n"));
 357                q = &fh->video_q;
 358        }
 359
 360        if (!list_empty(&q->stream))
 361                buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
 362
 363        if (!buf) {
 364                DEB_D(("buf == NULL!\n"));
 365                return POLLERR;
 366        }
 367
 368        poll_wait(file, &buf->done, wait);
 369        if (buf->state == VIDEOBUF_DONE || buf->state == VIDEOBUF_ERROR) {
 370                DEB_D(("poll succeeded!\n"));
 371                return POLLIN|POLLRDNORM;
 372        }
 373
 374        DEB_D(("nothing to poll for, buf->state:%d\n",buf->state));
 375        return 0;
 376}
 377
 378static ssize_t fops_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 379{
 380        struct saa7146_fh *fh = file->private_data;
 381
 382        switch (fh->type) {
 383        case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 384//              DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, data:%p, count:%lun", file, data, (unsigned long)count));
 385                return saa7146_video_uops.read(file,data,count,ppos);
 386                }
 387        case V4L2_BUF_TYPE_VBI_CAPTURE: {
 388//              DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, data:%p, count:%lu\n", file, data, (unsigned long)count));
 389                if (fh->dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 390                        return saa7146_vbi_uops.read(file,data,count,ppos);
 391                else
 392                        return -EINVAL;
 393                }
 394                break;
 395        default:
 396                BUG();
 397                return 0;
 398        }
 399}
 400
 401static ssize_t fops_write(struct file *file, const char __user *data, size_t count, loff_t *ppos)
 402{
 403        struct saa7146_fh *fh = file->private_data;
 404
 405        switch (fh->type) {
 406        case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 407                return -EINVAL;
 408        case V4L2_BUF_TYPE_VBI_CAPTURE:
 409                if (fh->dev->ext_vv_data->vbi_fops.write)
 410                        return fh->dev->ext_vv_data->vbi_fops.write(file, data, count, ppos);
 411                else
 412                        return -EINVAL;
 413        default:
 414                BUG();
 415                return -EINVAL;
 416        }
 417}
 418
 419static const struct file_operations video_fops =
 420{
 421        .owner          = THIS_MODULE,
 422        .open           = fops_open,
 423        .release        = fops_release,
 424        .read           = fops_read,
 425        .write          = fops_write,
 426        .poll           = fops_poll,
 427        .mmap           = fops_mmap,
 428        .ioctl          = fops_ioctl,
 429        .llseek         = no_llseek,
 430};
 431
 432static void vv_callback(struct saa7146_dev *dev, unsigned long status)
 433{
 434        u32 isr = status;
 435
 436        DEB_INT(("dev:%p, isr:0x%08x\n",dev,(u32)status));
 437
 438        if (0 != (isr & (MASK_27))) {
 439                DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
 440                saa7146_video_uops.irq_done(dev,isr);
 441        }
 442
 443        if (0 != (isr & (MASK_28))) {
 444                u32 mc2 = saa7146_read(dev, MC2);
 445                if( 0 != (mc2 & MASK_15)) {
 446                        DEB_INT(("irq: RPS1 vbi workaround (0x%08x).\n",isr));
 447                        wake_up(&dev->vv_data->vbi_wq);
 448                        saa7146_write(dev,MC2, MASK_31);
 449                        return;
 450                }
 451                DEB_INT(("irq: RPS1 (0x%08x).\n",isr));
 452                saa7146_vbi_uops.irq_done(dev,isr);
 453        }
 454}
 455
 456static struct video_device device_template =
 457{
 458        .fops           = &video_fops,
 459        .minor          = -1,
 460};
 461
 462int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
 463{
 464        struct saa7146_vv *vv = kzalloc (sizeof(struct saa7146_vv),GFP_KERNEL);
 465        if( NULL == vv ) {
 466                ERR(("out of memory. aborting.\n"));
 467                return -1;
 468        }
 469
 470        DEB_EE(("dev:%p\n",dev));
 471
 472        /* set default values for video parts of the saa7146 */
 473        saa7146_write(dev, BCS_CTRL, 0x80400040);
 474
 475        /* enable video-port pins */
 476        saa7146_write(dev, MC1, (MASK_10 | MASK_26));
 477
 478        /* save per-device extension data (one extension can
 479           handle different devices that might need different
 480           configuration data) */
 481        dev->ext_vv_data = ext_vv;
 482
 483        vv->video_minor = -1;
 484        vv->vbi_minor = -1;
 485
 486        vv->d_clipping.cpu_addr = pci_alloc_consistent(dev->pci, SAA7146_CLIPPING_MEM, &vv->d_clipping.dma_handle);
 487        if( NULL == vv->d_clipping.cpu_addr ) {
 488                ERR(("out of memory. aborting.\n"));
 489                kfree(vv);
 490                return -1;
 491        }
 492        memset(vv->d_clipping.cpu_addr, 0x0, SAA7146_CLIPPING_MEM);
 493
 494        saa7146_video_uops.init(dev,vv);
 495        if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 496                saa7146_vbi_uops.init(dev,vv);
 497
 498        dev->vv_data = vv;
 499        dev->vv_callback = &vv_callback;
 500
 501        return 0;
 502}
 503EXPORT_SYMBOL_GPL(saa7146_vv_init);
 504
 505int saa7146_vv_release(struct saa7146_dev* dev)
 506{
 507        struct saa7146_vv *vv = dev->vv_data;
 508
 509        DEB_EE(("dev:%p\n",dev));
 510
 511        pci_free_consistent(dev->pci, SAA7146_CLIPPING_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
 512        kfree(vv);
 513        dev->vv_data = NULL;
 514        dev->vv_callback = NULL;
 515
 516        return 0;
 517}
 518EXPORT_SYMBOL_GPL(saa7146_vv_release);
 519
 520int saa7146_register_device(struct video_device **vid, struct saa7146_dev* dev,
 521                            char *name, int type)
 522{
 523        struct saa7146_vv *vv = dev->vv_data;
 524        struct video_device *vfd;
 525
 526        DEB_EE(("dev:%p, name:'%s', type:%d\n",dev,name,type));
 527
 528        // released by vfd->release
 529        vfd = video_device_alloc();
 530        if (vfd == NULL)
 531                return -ENOMEM;
 532
 533        memcpy(vfd, &device_template, sizeof(struct video_device));
 534        strlcpy(vfd->name, name, sizeof(vfd->name));
 535        vfd->release = video_device_release;
 536        video_set_drvdata(vfd, dev);
 537
 538        // fixme: -1 should be an insmod parameter *for the extension* (like "video_nr");
 539        if (video_register_device(vfd, type, -1) < 0) {
 540                ERR(("cannot register v4l2 device. skipping.\n"));
 541                video_device_release(vfd);
 542                return -1;
 543        }
 544
 545        if( VFL_TYPE_GRABBER == type ) {
 546                vv->video_minor = vfd->minor;
 547                INFO(("%s: registered device video%d [v4l2]\n",
 548                        dev->name, vfd->num));
 549        } else {
 550                vv->vbi_minor = vfd->minor;
 551                INFO(("%s: registered device vbi%d [v4l2]\n",
 552                        dev->name, vfd->num));
 553        }
 554
 555        *vid = vfd;
 556        return 0;
 557}
 558EXPORT_SYMBOL_GPL(saa7146_register_device);
 559
 560int saa7146_unregister_device(struct video_device **vid, struct saa7146_dev* dev)
 561{
 562        struct saa7146_vv *vv = dev->vv_data;
 563
 564        DEB_EE(("dev:%p\n",dev));
 565
 566        if ((*vid)->vfl_type == VFL_TYPE_GRABBER) {
 567                vv->video_minor = -1;
 568        } else {
 569                vv->vbi_minor = -1;
 570        }
 571
 572        video_unregister_device(*vid);
 573        *vid = NULL;
 574
 575        return 0;
 576}
 577EXPORT_SYMBOL_GPL(saa7146_unregister_device);
 578
 579static int __init saa7146_vv_init_module(void)
 580{
 581        return 0;
 582}
 583
 584
 585static void __exit saa7146_vv_cleanup_module(void)
 586{
 587}
 588
 589module_init(saa7146_vv_init_module);
 590module_exit(saa7146_vv_cleanup_module);
 591
 592MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 593MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
 594MODULE_LICENSE("GPL");
 595