LXR linux/drivers/media/common/saa7146

   1#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   2
   3#include <media/saa7146_vv.h>
   4#include <linux/module.h>
   5
   6/****************************************************************************/
   7/* resource management functions, shamelessly stolen from saa7134 driver */
   8
   9int 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",
  16                      bit, vv->resources);
  17                /* have it already allocated */
  18                return 1;
  19        }
  20
  21        /* is it free? */
  22        if (vv->resources & bit) {
  23                DEB_D("locked! vv->resources:0x%02x, we want:0x%02x\n",
  24                      vv->resources, bit);
  25                /* no, someone else uses it */
  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        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        fh->resources &= ~bits;
  43        vv->resources &= ~bits;
  44        DEB_D("res: put 0x%02x, cur:0x%02x\n", bits, vv->resources);
  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(q, &buf->vb, 0, 0);
  60        videobuf_dma_unmap(q->dev, 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",
  86                      buf);
  87        }
  88        return 0;
  89}
  90
  91void saa7146_buffer_finish(struct saa7146_dev *dev,
  92                           struct saa7146_dmaqueue *q,
  93                           int state)
  94{
  95        assert_spin_locked(&dev->slock);
  96        DEB_EE("dev:%p, dmaq:%p, state:%d\n", dev, q, state);
  97        DEB_EE("q->curr:%p\n", q->curr);
  98
  99        BUG_ON(!q->curr);
 100
 101        /* finish current buffer */
 102        if (NULL == q->curr) {
 103                DEB_D("aiii. no current buffer\n");
 104                return;
 105        }
 106
 107        q->curr->vb.state = state;
 108        do_gettimeofday(&q->curr->vb.ts);
 109        wake_up(&q->curr->vb.done);
 110
 111        q->curr = NULL;
 112}
 113
 114void saa7146_buffer_next(struct saa7146_dev *dev,
 115                         struct saa7146_dmaqueue *q, int vbi)
 116{
 117        struct saa7146_buf *buf,*next = NULL;
 118
 119        BUG_ON(!q);
 120
 121        DEB_INT("dev:%p, dmaq:%p, vbi:%d\n", dev, q, vbi);
 122
 123        assert_spin_locked(&dev->slock);
 124        if (!list_empty(&q->queue)) {
 125                /* activate next one from queue */
 126                buf = list_entry(q->queue.next,struct saa7146_buf,vb.queue);
 127                list_del(&buf->vb.queue);
 128                if (!list_empty(&q->queue))
 129                        next = list_entry(q->queue.next,struct saa7146_buf, vb.queue);
 130                q->curr = buf;
 131                DEB_INT("next buffer: buf:%p, prev:%p, next:%p\n",
 132                        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 file *file)
 196{
 197        struct video_device *vdev = video_devdata(file);
 198        struct saa7146_dev *dev = video_drvdata(file);
 199        struct saa7146_fh *fh = NULL;
 200        int result = 0;
 201
 202        enum v4l2_buf_type type;
 203
 204        DEB_EE("file:%p, dev:%s\n", file, video_device_node_name(vdev));
 205
 206        if (mutex_lock_interruptible(&saa7146_devices_lock))
 207                return -ERESTARTSYS;
 208
 209        DEB_D("using: %p\n", dev);
 210
 211        type = vdev->vfl_type == VFL_TYPE_GRABBER
 212             ? V4L2_BUF_TYPE_VIDEO_CAPTURE
 213             : V4L2_BUF_TYPE_VBI_CAPTURE;
 214
 215        /* check if an extension is registered */
 216        if( NULL == dev->ext ) {
 217                DEB_S("no extension registered for this device\n");
 218                result = -ENODEV;
 219                goto out;
 220        }
 221
 222        /* allocate per open data */
 223        fh = kzalloc(sizeof(*fh),GFP_KERNEL);
 224        if (NULL == fh) {
 225                DEB_S("cannot allocate memory for per open data\n");
 226                result = -ENOMEM;
 227                goto out;
 228        }
 229
 230        file->private_data = fh;
 231        fh->dev = dev;
 232        fh->type = type;
 233
 234        if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 235                DEB_S("initializing vbi...\n");
 236                if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 237                        result = saa7146_vbi_uops.open(dev,file);
 238                if (dev->ext_vv_data->vbi_fops.open)
 239                        dev->ext_vv_data->vbi_fops.open(file);
 240        } else {
 241                DEB_S("initializing video...\n");
 242                result = saa7146_video_uops.open(dev,file);
 243        }
 244
 245        if (0 != result) {
 246                goto out;
 247        }
 248
 249        if( 0 == try_module_get(dev->ext->module)) {
 250                result = -EINVAL;
 251                goto out;
 252        }
 253
 254        result = 0;
 255out:
 256        if (fh && result != 0) {
 257                kfree(fh);
 258                file->private_data = NULL;
 259        }
 260        mutex_unlock(&saa7146_devices_lock);
 261        return result;
 262}
 263
 264static int fops_release(struct file *file)
 265{
 266        struct saa7146_fh  *fh  = file->private_data;
 267        struct saa7146_dev *dev = fh->dev;
 268
 269        DEB_EE("file:%p\n", file);
 270
 271        if (mutex_lock_interruptible(&saa7146_devices_lock))
 272                return -ERESTARTSYS;
 273
 274        if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 275                if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 276                        saa7146_vbi_uops.release(dev,file);
 277                if (dev->ext_vv_data->vbi_fops.release)
 278                        dev->ext_vv_data->vbi_fops.release(file);
 279        } else {
 280                saa7146_video_uops.release(dev,file);
 281        }
 282
 283        module_put(dev->ext->module);
 284        file->private_data = NULL;
 285        kfree(fh);
 286
 287        mutex_unlock(&saa7146_devices_lock);
 288
 289        return 0;
 290}
 291
 292static int fops_mmap(struct file *file, struct vm_area_struct * vma)
 293{
 294        struct saa7146_fh *fh = file->private_data;
 295        struct videobuf_queue *q;
 296
 297        switch (fh->type) {
 298        case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 299                DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, vma:%p\n",
 300                       file, vma);
 301                q = &fh->video_q;
 302                break;
 303                }
 304        case V4L2_BUF_TYPE_VBI_CAPTURE: {
 305                DEB_EE("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, vma:%p\n",
 306                       file, vma);
 307                q = &fh->vbi_q;
 308                break;
 309                }
 310        default:
 311                BUG();
 312                return 0;
 313        }
 314
 315        return videobuf_mmap_mapper(q,vma);
 316}
 317
 318static unsigned int fops_poll(struct file *file, struct poll_table_struct *wait)
 319{
 320        struct saa7146_fh *fh = file->private_data;
 321        struct videobuf_buffer *buf = NULL;
 322        struct videobuf_queue *q;
 323
 324        DEB_EE("file:%p, poll:%p\n", file, wait);
 325
 326        if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) {
 327                if( 0 == fh->vbi_q.streaming )
 328                        return videobuf_poll_stream(file, &fh->vbi_q, wait);
 329                q = &fh->vbi_q;
 330        } else {
 331                DEB_D("using video queue\n");
 332                q = &fh->video_q;
 333        }
 334
 335        if (!list_empty(&q->stream))
 336                buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
 337
 338        if (!buf) {
 339                DEB_D("buf == NULL!\n");
 340                return POLLERR;
 341        }
 342
 343        poll_wait(file, &buf->done, wait);
 344        if (buf->state == VIDEOBUF_DONE || buf->state == VIDEOBUF_ERROR) {
 345                DEB_D("poll succeeded!\n");
 346                return POLLIN|POLLRDNORM;
 347        }
 348
 349        DEB_D("nothing to poll for, buf->state:%d\n", buf->state);
 350        return 0;
 351}
 352
 353static ssize_t fops_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 354{
 355        struct saa7146_fh *fh = file->private_data;
 356
 357        switch (fh->type) {
 358        case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 359/*
 360                DEB_EE("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, data:%p, count:%lun",
 361                       file, data, (unsigned long)count);
 362*/
 363                return saa7146_video_uops.read(file,data,count,ppos);
 364        case V4L2_BUF_TYPE_VBI_CAPTURE:
 365/*
 366                DEB_EE("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, data:%p, count:%lu\n",
 367                       file, data, (unsigned long)count);
 368*/
 369                if (fh->dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 370                        return saa7146_vbi_uops.read(file,data,count,ppos);
 371                return -EINVAL;
 372        default:
 373                BUG();
 374                return 0;
 375        }
 376}
 377
 378static ssize_t fops_write(struct file *file, const 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                return -EINVAL;
 385        case V4L2_BUF_TYPE_VBI_CAPTURE:
 386                if (fh->dev->ext_vv_data->vbi_fops.write)
 387                        return fh->dev->ext_vv_data->vbi_fops.write(file, data, count, ppos);
 388                else
 389                        return -EINVAL;
 390        default:
 391                BUG();
 392                return -EINVAL;
 393        }
 394}
 395
 396static const struct v4l2_file_operations video_fops =
 397{
 398        .owner          = THIS_MODULE,
 399        .open           = fops_open,
 400        .release        = fops_release,
 401        .read           = fops_read,
 402        .write          = fops_write,
 403        .poll           = fops_poll,
 404        .mmap           = fops_mmap,
 405        .unlocked_ioctl = video_ioctl2,
 406};
 407
 408static void vv_callback(struct saa7146_dev *dev, unsigned long status)
 409{
 410        u32 isr = status;
 411
 412        DEB_INT("dev:%p, isr:0x%08x\n", dev, (u32)status);
 413
 414        if (0 != (isr & (MASK_27))) {
 415                DEB_INT("irq: RPS0 (0x%08x)\n", isr);
 416                saa7146_video_uops.irq_done(dev,isr);
 417        }
 418
 419        if (0 != (isr & (MASK_28))) {
 420                u32 mc2 = saa7146_read(dev, MC2);
 421                if( 0 != (mc2 & MASK_15)) {
 422                        DEB_INT("irq: RPS1 vbi workaround (0x%08x)\n", isr);
 423                        wake_up(&dev->vv_data->vbi_wq);
 424                        saa7146_write(dev,MC2, MASK_31);
 425                        return;
 426                }
 427                DEB_INT("irq: RPS1 (0x%08x)\n", isr);
 428                saa7146_vbi_uops.irq_done(dev,isr);
 429        }
 430}
 431
 432int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
 433{
 434        struct saa7146_vv *vv;
 435        int err;
 436
 437        err = v4l2_device_register(&dev->pci->dev, &dev->v4l2_dev);
 438        if (err)
 439                return err;
 440
 441        vv = kzalloc(sizeof(struct saa7146_vv), GFP_KERNEL);
 442        if (vv == NULL) {
 443                ERR("out of memory. aborting.\n");
 444                return -ENOMEM;
 445        }
 446        ext_vv->ops = saa7146_video_ioctl_ops;
 447        ext_vv->core_ops = &saa7146_video_ioctl_ops;
 448
 449        DEB_EE("dev:%p\n", dev);
 450
 451        /* set default values for video parts of the saa7146 */
 452        saa7146_write(dev, BCS_CTRL, 0x80400040);
 453
 454        /* enable video-port pins */
 455        saa7146_write(dev, MC1, (MASK_10 | MASK_26));
 456
 457        /* save per-device extension data (one extension can
 458           handle different devices that might need different
 459           configuration data) */
 460        dev->ext_vv_data = ext_vv;
 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        if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
 472                saa7146_vbi_uops.init(dev,vv);
 473
 474        dev->vv_data = vv;
 475        dev->vv_callback = &vv_callback;
 476
 477        return 0;
 478}
 479EXPORT_SYMBOL_GPL(saa7146_vv_init);
 480
 481int saa7146_vv_release(struct saa7146_dev* dev)
 482{
 483        struct saa7146_vv *vv = dev->vv_data;
 484
 485        DEB_EE("dev:%p\n", dev);
 486
 487        v4l2_device_unregister(&dev->v4l2_dev);
 488        pci_free_consistent(dev->pci, SAA7146_CLIPPING_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
 489        kfree(vv);
 490        dev->vv_data = NULL;
 491        dev->vv_callback = NULL;
 492
 493        return 0;
 494}
 495EXPORT_SYMBOL_GPL(saa7146_vv_release);
 496
 497int saa7146_register_device(struct video_device **vid, struct saa7146_dev* dev,
 498                            char *name, int type)
 499{
 500        struct video_device *vfd;
 501        int err;
 502        int i;
 503
 504        DEB_EE("dev:%p, name:'%s', type:%d\n", dev, name, type);
 505
 506        // released by vfd->release
 507        vfd = video_device_alloc();
 508        if (vfd == NULL)
 509                return -ENOMEM;
 510
 511        vfd->fops = &video_fops;
 512        vfd->ioctl_ops = &dev->ext_vv_data->ops;
 513        vfd->release = video_device_release;
 514        vfd->lock = &dev->v4l2_lock;
 515        vfd->tvnorms = 0;
 516        for (i = 0; i < dev->ext_vv_data->num_stds; i++)
 517                vfd->tvnorms |= dev->ext_vv_data->stds[i].id;
 518        strlcpy(vfd->name, name, sizeof(vfd->name));
 519        video_set_drvdata(vfd, dev);
 520
 521        err = video_register_device(vfd, type, -1);
 522        if (err < 0) {
 523                ERR("cannot register v4l2 device. skipping.\n");
 524                video_device_release(vfd);
 525                return err;
 526        }
 527
 528        pr_info("%s: registered device %s [v4l2]\n",
 529                dev->name, video_device_node_name(vfd));
 530
 531        *vid = vfd;
 532        return 0;
 533}
 534EXPORT_SYMBOL_GPL(saa7146_register_device);
 535
 536int saa7146_unregister_device(struct video_device **vid, struct saa7146_dev* dev)
 537{
 538        DEB_EE("dev:%p\n", dev);
 539
 540        video_unregister_device(*vid);
 541        *vid = NULL;
 542
 543        return 0;
 544}
 545EXPORT_SYMBOL_GPL(saa7146_unregister_device);
 546
 547static int __init saa7146_vv_init_module(void)
 548{
 549        return 0;
 550}
 551
 552
 553static void __exit saa7146_vv_cleanup_module(void)
 554{
 555}
 556
 557module_init(saa7146_vv_init_module);
 558module_exit(saa7146_vv_cleanup_module);
 559
 560MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 561MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
 562MODULE_LICENSE("GPL");
 563