linux/drivers/media/common/saa7146_fops.c
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   1#include <media/saa7146_vv.h>
   2
   3/****************************************************************************/
   4/* resource management functions, shamelessly stolen from saa7134 driver */
   5
   6int saa7146_res_get(struct saa7146_fh *fh, unsigned int bit)
   7{
   8        struct saa7146_dev *dev = fh->dev;
   9        struct saa7146_vv *vv = dev->vv_data;
  10
  11        if (fh->resources & bit) {
  12                DEB_D(("already allocated! want: 0x%02x, cur:0x%02x\n",bit,vv->resources));
  13                /* have it already allocated */
  14                return 1;
  15        }
  16
  17        /* is it free? */
  18        mutex_lock(&dev->lock);
  19        if (vv->resources & bit) {
  20                DEB_D(("locked! vv->resources:0x%02x, we want:0x%02x\n",vv->resources,bit));
  21                /* no, someone else uses it */
  22                mutex_unlock(&dev->lock);
  23                return 0;
  24        }
  25        /* it's free, grab it */
  26        fh->resources  |= bit;
  27        vv->resources |= bit;
  28        DEB_D(("res: get 0x%02x, cur:0x%02x\n",bit,vv->resources));
  29        mutex_unlock(&dev->lock);
  30        return 1;
  31}
  32
  33void saa7146_res_free(struct saa7146_fh *fh, unsigned int bits)
  34{
  35        struct saa7146_dev *dev = fh->dev;
  36        struct saa7146_vv *vv = dev->vv_data;
  37
  38        BUG_ON((fh->resources & bits) != bits);
  39
  40        mutex_lock(&dev->lock);
  41        fh->resources  &= ~bits;
  42        vv->resources &= ~bits;
  43        DEB_D(("res: put 0x%02x, cur:0x%02x\n",bits,vv->resources));
  44        mutex_unlock(&dev->lock);
  45}
  46
  47
  48/********************************************************************************/
  49/* common dma functions */
  50
  51void saa7146_dma_free(struct saa7146_dev *dev,struct videobuf_queue *q,
  52                                                struct saa7146_buf *buf)
  53{
  54        struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
  55        DEB_EE(("dev:%p, buf:%p\n",dev,buf));
  56
  57        BUG_ON(in_interrupt());
  58
  59        videobuf_waiton(&buf->vb,0,0);
  60        videobuf_dma_unmap(q, dma);
  61        videobuf_dma_free(dma);
  62        buf->vb.state = VIDEOBUF_NEEDS_INIT;
  63}
  64
  65
  66/********************************************************************************/
  67/* common buffer functions */
  68
  69int saa7146_buffer_queue(struct saa7146_dev *dev,
  70                         struct saa7146_dmaqueue *q,
  71                         struct saa7146_buf *buf)
  72{
  73        assert_spin_locked(&dev->slock);
  74        DEB_EE(("dev:%p, dmaq:%p, buf:%p\n", dev, q, buf));
  75
  76        BUG_ON(!q);
  77
  78        if (NULL == q->curr) {
  79                q->curr = buf;
  80                DEB_D(("immediately activating buffer %p\n", buf));
  81                buf->activate(dev,buf,NULL);
  82        } else {
  83                list_add_tail(&buf->vb.queue,&q->queue);
  84                buf->vb.state = VIDEOBUF_QUEUED;
  85                DEB_D(("adding buffer %p to queue. (active buffer present)\n", buf));
  86        }
  87        return 0;
  88}
  89
  90void saa7146_buffer_finish(struct saa7146_dev *dev,
  91                           struct saa7146_dmaqueue *q,
  92                           int state)
  93{
  94        assert_spin_locked(&dev->slock);
  95        DEB_EE(("dev:%p, dmaq:%p, state:%d\n", dev, q, state));
  96        DEB_EE(("q->curr:%p\n",q->curr));
  97
  98        BUG_ON(!q->curr);
  99
 100        /* finish current buffer */
 101        if (NULL == q->curr) {
 102                DEB_D(("aiii. no current buffer\n"));
 103                return;
 104        }
 105
 106        q->curr->vb.state = state;
 107        do_gettimeofday(&q->curr->vb.ts);
 108        wake_up(&q->curr->vb.done);
 109
 110        q->curr = NULL;
 111}
 112
 113void saa7146_buffer_next(struct saa7146_dev *dev,
 114                         struct saa7146_dmaqueue *q, int vbi)
 115{
 116        struct saa7146_buf *buf,*next = NULL;
 117
 118        BUG_ON(!q);
 119
 120        DEB_INT(("dev:%p, dmaq:%p, vbi:%d\n", dev, q, vbi));
 121
 122        assert_spin_locked(&dev->slock);
 123        if (!list_empty(&q->queue)) {
 124                /* activate next one from queue */
 125                buf = list_entry(q->queue.next,struct saa7146_buf,vb.queue);
 126                list_del(&buf->vb.queue);
 127                if (!list_empty(&q->queue))
 128                        next = list_entry(q->queue.next,struct saa7146_buf, vb.queue);
 129                q->curr = buf;
 130                DEB_INT(("next buffer: buf:%p, prev:%p, next:%p\n", buf, q->queue.prev,q->queue.next));
 131                buf->activate(dev,buf,next);
 132        } else {
 133                DEB_INT(("no next buffer. stopping.\n"));
 134                if( 0 != vbi ) {
 135                        /* turn off video-dma3 */
 136                        saa7146_write(dev,MC1, MASK_20);
 137                } else {
 138                        /* nothing to do -- just prevent next video-dma1 transfer
 139                           by lowering the protection address */
 140
 141                        // fixme: fix this for vflip != 0
 142
 143                        saa7146_write(dev, PROT_ADDR1, 0);
 144                        saa7146_write(dev, MC2, (MASK_02|MASK_18));
 145
 146                        /* write the address of the rps-program */
 147                        saa7146_write(dev, RPS_ADDR0, dev->d_rps0.dma_handle);
 148                        /* turn on rps */
 149                        saa7146_write(dev, MC1, (MASK_12 | MASK_28));
 150
 151/*
 152                        printk("vdma%d.base_even:     0x%08x\n", 1,saa7146_read(dev,BASE_EVEN1));
 153                        printk("vdma%d.base_odd:      0x%08x\n", 1,saa7146_read(dev,BASE_ODD1));
 154                        printk("vdma%d.prot_addr:     0x%08x\n", 1,saa7146_read(dev,PROT_ADDR1));
 155                        printk("vdma%d.base_page:     0x%08x\n", 1,saa7146_read(dev,BASE_PAGE1));
 156                        printk("vdma%d.pitch:         0x%08x\n", 1,saa7146_read(dev,PITCH1));
 157                        printk("vdma%d.num_line_byte: 0x%08x\n", 1,saa7146_read(dev,NUM_LINE_BYTE1));
 158*/
 159                }
 160                del_timer(&q->timeout);
 161        }
 162}
 163
 164void saa7146_buffer_timeout(unsigned long data)
 165{
 166        struct saa7146_dmaqueue *q = (struct saa7146_dmaqueue*)data;
 167        struct saa7146_dev *dev = q->dev;
 168        unsigned long flags;
 169
 170        DEB_EE(("dev:%p, dmaq:%p\n", dev, q));
 171
 172        spin_lock_irqsave(&dev->slock,flags);
 173        if (q->curr) {
 174                DEB_D(("timeout on %p\n", q->curr));
 175                saa7146_buffer_finish(dev,q,VIDEOBUF_ERROR);
 176        }
 177
 178        /* we don't restart the transfer here like other drivers do. when
 179           a streaming capture is disabled, the timeout function will be
 180           called for the current buffer. if we activate the next buffer now,
 181           we mess up our capture logic. if a timeout occurs on another buffer,
 182           then something is seriously broken before, so no need to buffer the
 183           next capture IMHO... */
 184/*
 185        saa7146_buffer_next(dev,q);
 186*/
 187        spin_unlock_irqrestore(&dev->slock,flags);
 188}
 189
 190/********************************************************************************/
 191/* file operations */
 192
 193static int fops_open(struct file *file)
 194{
 195        struct video_device *vdev = video_devdata(file);
 196        struct saa7146_dev *dev = video_drvdata(file);
 197        struct saa7146_fh *fh = NULL;
 198        int result = 0;
 199
 200        enum v4l2_buf_type type;
 201
 202        DEB_EE(("file:%p, dev:%s\n", file, video_device_node_name(vdev)));
 203
 204        if (mutex_lock_interruptible(&saa7146_devices_lock))
 205                return -ERESTARTSYS;
 206
 207        DEB_D(("using: %p\n",dev));
 208
 209        type = vdev->vfl_type == VFL_TYPE_GRABBER
 210             ? V4L2_BUF_TYPE_VIDEO_CAPTURE
 211             : V4L2_BUF_TYPE_VBI_CAPTURE;
 212
 213        /* check if an extension is registered */
 214        if( NULL == dev->ext ) {
 215                DEB_S(("no extension registered for this device.\n"));
 216                result = -ENODEV;
 217                goto out;
 218        }
 219
 220        /* allocate per open data */
 221        fh = kzalloc(sizeof(*fh),GFP_KERNEL);
 222        if (NULL == fh) {
 223                DEB_S(("cannot allocate memory for per open data.\n"));
 224                result = -ENOMEM;
 225                goto out;
 226        }
 227
 228        file->private_data = fh;
 229        fh->dev = dev;
 230        fh->type = type;
 231
 232        if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 233                DEB_S(("initializing vbi...\n"));
 234                if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 235                        result = saa7146_vbi_uops.open(dev,file);
 236                if (dev->ext_vv_data->vbi_fops.open)
 237                        dev->ext_vv_data->vbi_fops.open(file);
 238        } else {
 239                DEB_S(("initializing video...\n"));
 240                result = saa7146_video_uops.open(dev,file);
 241        }
 242
 243        if (0 != result) {
 244                goto out;
 245        }
 246
 247        if( 0 == try_module_get(dev->ext->module)) {
 248                result = -EINVAL;
 249                goto out;
 250        }
 251
 252        result = 0;
 253out:
 254        if (fh && result != 0) {
 255                kfree(fh);
 256                file->private_data = NULL;
 257        }
 258        mutex_unlock(&saa7146_devices_lock);
 259        return result;
 260}
 261
 262static int fops_release(struct file *file)
 263{
 264        struct saa7146_fh  *fh  = file->private_data;
 265        struct saa7146_dev *dev = fh->dev;
 266
 267        DEB_EE(("file:%p\n", file));
 268
 269        if (mutex_lock_interruptible(&saa7146_devices_lock))
 270                return -ERESTARTSYS;
 271
 272        if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 273                if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 274                        saa7146_vbi_uops.release(dev,file);
 275                if (dev->ext_vv_data->vbi_fops.release)
 276                        dev->ext_vv_data->vbi_fops.release(file);
 277        } else {
 278                saa7146_video_uops.release(dev,file);
 279        }
 280
 281        module_put(dev->ext->module);
 282        file->private_data = NULL;
 283        kfree(fh);
 284
 285        mutex_unlock(&saa7146_devices_lock);
 286
 287        return 0;
 288}
 289
 290static int fops_mmap(struct file *file, struct vm_area_struct * vma)
 291{
 292        struct saa7146_fh *fh = file->private_data;
 293        struct videobuf_queue *q;
 294
 295        switch (fh->type) {
 296        case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 297                DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, vma:%p\n",file, vma));
 298                q = &fh->video_q;
 299                break;
 300                }
 301        case V4L2_BUF_TYPE_VBI_CAPTURE: {
 302                DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, vma:%p\n",file, vma));
 303                q = &fh->vbi_q;
 304                break;
 305                }
 306        default:
 307                BUG();
 308                return 0;
 309        }
 310
 311        return videobuf_mmap_mapper(q,vma);
 312}
 313
 314static unsigned int fops_poll(struct file *file, struct poll_table_struct *wait)
 315{
 316        struct saa7146_fh *fh = file->private_data;
 317        struct videobuf_buffer *buf = NULL;
 318        struct videobuf_queue *q;
 319
 320        DEB_EE(("file:%p, poll:%p\n",file, wait));
 321
 322        if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) {
 323                if( 0 == fh->vbi_q.streaming )
 324                        return videobuf_poll_stream(file, &fh->vbi_q, wait);
 325                q = &fh->vbi_q;
 326        } else {
 327                DEB_D(("using video queue.\n"));
 328                q = &fh->video_q;
 329        }
 330
 331        if (!list_empty(&q->stream))
 332                buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
 333
 334        if (!buf) {
 335                DEB_D(("buf == NULL!\n"));
 336                return POLLERR;
 337        }
 338
 339        poll_wait(file, &buf->done, wait);
 340        if (buf->state == VIDEOBUF_DONE || buf->state == VIDEOBUF_ERROR) {
 341                DEB_D(("poll succeeded!\n"));
 342                return POLLIN|POLLRDNORM;
 343        }
 344
 345        DEB_D(("nothing to poll for, buf->state:%d\n",buf->state));
 346        return 0;
 347}
 348
 349static ssize_t fops_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 350{
 351        struct saa7146_fh *fh = file->private_data;
 352
 353        switch (fh->type) {
 354        case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 355//              DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, data:%p, count:%lun", file, data, (unsigned long)count));
 356                return saa7146_video_uops.read(file,data,count,ppos);
 357                }
 358        case V4L2_BUF_TYPE_VBI_CAPTURE: {
 359//              DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, data:%p, count:%lu\n", file, data, (unsigned long)count));
 360                if (fh->dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 361                        return saa7146_vbi_uops.read(file,data,count,ppos);
 362                else
 363                        return -EINVAL;
 364                }
 365                break;
 366        default:
 367                BUG();
 368                return 0;
 369        }
 370}
 371
 372static ssize_t fops_write(struct file *file, const char __user *data, size_t count, loff_t *ppos)
 373{
 374        struct saa7146_fh *fh = file->private_data;
 375
 376        switch (fh->type) {
 377        case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 378                return -EINVAL;
 379        case V4L2_BUF_TYPE_VBI_CAPTURE:
 380                if (fh->dev->ext_vv_data->vbi_fops.write)
 381                        return fh->dev->ext_vv_data->vbi_fops.write(file, data, count, ppos);
 382                else
 383                        return -EINVAL;
 384        default:
 385                BUG();
 386                return -EINVAL;
 387        }
 388}
 389
 390static const struct v4l2_file_operations video_fops =
 391{
 392        .owner          = THIS_MODULE,
 393        .open           = fops_open,
 394        .release        = fops_release,
 395        .read           = fops_read,
 396        .write          = fops_write,
 397        .poll           = fops_poll,
 398        .mmap           = fops_mmap,
 399        .ioctl          = video_ioctl2,
 400};
 401
 402static void vv_callback(struct saa7146_dev *dev, unsigned long status)
 403{
 404        u32 isr = status;
 405
 406        DEB_INT(("dev:%p, isr:0x%08x\n",dev,(u32)status));
 407
 408        if (0 != (isr & (MASK_27))) {
 409                DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
 410                saa7146_video_uops.irq_done(dev,isr);
 411        }
 412
 413        if (0 != (isr & (MASK_28))) {
 414                u32 mc2 = saa7146_read(dev, MC2);
 415                if( 0 != (mc2 & MASK_15)) {
 416                        DEB_INT(("irq: RPS1 vbi workaround (0x%08x).\n",isr));
 417                        wake_up(&dev->vv_data->vbi_wq);
 418                        saa7146_write(dev,MC2, MASK_31);
 419                        return;
 420                }
 421                DEB_INT(("irq: RPS1 (0x%08x).\n",isr));
 422                saa7146_vbi_uops.irq_done(dev,isr);
 423        }
 424}
 425
 426int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
 427{
 428        struct saa7146_vv *vv;
 429        int err;
 430
 431        err = v4l2_device_register(&dev->pci->dev, &dev->v4l2_dev);
 432        if (err)
 433                return err;
 434
 435        vv = kzalloc(sizeof(struct saa7146_vv), GFP_KERNEL);
 436        if (vv == NULL) {
 437                ERR(("out of memory. aborting.\n"));
 438                return -ENOMEM;
 439        }
 440        ext_vv->ops = saa7146_video_ioctl_ops;
 441        ext_vv->core_ops = &saa7146_video_ioctl_ops;
 442
 443        DEB_EE(("dev:%p\n",dev));
 444
 445        /* set default values for video parts of the saa7146 */
 446        saa7146_write(dev, BCS_CTRL, 0x80400040);
 447
 448        /* enable video-port pins */
 449        saa7146_write(dev, MC1, (MASK_10 | MASK_26));
 450
 451        /* save per-device extension data (one extension can
 452           handle different devices that might need different
 453           configuration data) */
 454        dev->ext_vv_data = ext_vv;
 455
 456        vv->d_clipping.cpu_addr = pci_alloc_consistent(dev->pci, SAA7146_CLIPPING_MEM, &vv->d_clipping.dma_handle);
 457        if( NULL == vv->d_clipping.cpu_addr ) {
 458                ERR(("out of memory. aborting.\n"));
 459                kfree(vv);
 460                return -1;
 461        }
 462        memset(vv->d_clipping.cpu_addr, 0x0, SAA7146_CLIPPING_MEM);
 463
 464        saa7146_video_uops.init(dev,vv);
 465        if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 466                saa7146_vbi_uops.init(dev,vv);
 467
 468        dev->vv_data = vv;
 469        dev->vv_callback = &vv_callback;
 470
 471        return 0;
 472}
 473EXPORT_SYMBOL_GPL(saa7146_vv_init);
 474
 475int saa7146_vv_release(struct saa7146_dev* dev)
 476{
 477        struct saa7146_vv *vv = dev->vv_data;
 478
 479        DEB_EE(("dev:%p\n",dev));
 480
 481        v4l2_device_unregister(&dev->v4l2_dev);
 482        pci_free_consistent(dev->pci, SAA7146_CLIPPING_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
 483        kfree(vv);
 484        dev->vv_data = NULL;
 485        dev->vv_callback = NULL;
 486
 487        return 0;
 488}
 489EXPORT_SYMBOL_GPL(saa7146_vv_release);
 490
 491int saa7146_register_device(struct video_device **vid, struct saa7146_dev* dev,
 492                            char *name, int type)
 493{
 494        struct video_device *vfd;
 495        int err;
 496        int i;
 497
 498        DEB_EE(("dev:%p, name:'%s', type:%d\n",dev,name,type));
 499
 500        // released by vfd->release
 501        vfd = video_device_alloc();
 502        if (vfd == NULL)
 503                return -ENOMEM;
 504
 505        vfd->fops = &video_fops;
 506        vfd->ioctl_ops = &dev->ext_vv_data->ops;
 507        vfd->release = video_device_release;
 508        vfd->tvnorms = 0;
 509        for (i = 0; i < dev->ext_vv_data->num_stds; i++)
 510                vfd->tvnorms |= dev->ext_vv_data->stds[i].id;
 511        strlcpy(vfd->name, name, sizeof(vfd->name));
 512        video_set_drvdata(vfd, dev);
 513
 514        err = video_register_device(vfd, type, -1);
 515        if (err < 0) {
 516                ERR(("cannot register v4l2 device. skipping.\n"));
 517                video_device_release(vfd);
 518                return err;
 519        }
 520
 521        INFO(("%s: registered device %s [v4l2]\n",
 522                dev->name, video_device_node_name(vfd)));
 523
 524        *vid = vfd;
 525        return 0;
 526}
 527EXPORT_SYMBOL_GPL(saa7146_register_device);
 528
 529int saa7146_unregister_device(struct video_device **vid, struct saa7146_dev* dev)
 530{
 531        DEB_EE(("dev:%p\n",dev));
 532
 533        video_unregister_device(*vid);
 534        *vid = NULL;
 535
 536        return 0;
 537}
 538EXPORT_SYMBOL_GPL(saa7146_unregister_device);
 539
 540static int __init saa7146_vv_init_module(void)
 541{
 542        return 0;
 543}
 544
 545
 546static void __exit saa7146_vv_cleanup_module(void)
 547{
 548}
 549
 550module_init(saa7146_vv_init_module);
 551module_exit(saa7146_vv_cleanup_module);
 552
 553MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 554MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
 555MODULE_LICENSE("GPL");
 556