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saa7146_fops.c

#include <media/saa7146_vv.h>

#define BOARD_CAN_DO_VBI(dev)   (dev->revision != 0 && dev->vv_data->vbi_minor != -1)

/****************************************************************************/
/* resource management functions, shamelessly stolen from saa7134 driver */

int saa7146_res_get(struct saa7146_fh *fh, unsigned int bit)
{
      struct saa7146_dev *dev = fh->dev;
      struct saa7146_vv *vv = dev->vv_data;

      if (fh->resources & bit) {
            DEB_D(("already allocated! want: 0x%02x, cur:0x%02x\n",bit,vv->resources));
            /* have it already allocated */
            return 1;
      }

      /* is it free? */
      mutex_lock(&dev->lock);
      if (vv->resources & bit) {
            DEB_D(("locked! vv->resources:0x%02x, we want:0x%02x\n",vv->resources,bit));
            /* no, someone else uses it */
            mutex_unlock(&dev->lock);
            return 0;
      }
      /* it's free, grab it */
      fh->resources  |= bit;
      vv->resources |= bit;
      DEB_D(("res: get 0x%02x, cur:0x%02x\n",bit,vv->resources));
      mutex_unlock(&dev->lock);
      return 1;
}

void saa7146_res_free(struct saa7146_fh *fh, unsigned int bits)
{
      struct saa7146_dev *dev = fh->dev;
      struct saa7146_vv *vv = dev->vv_data;

      BUG_ON((fh->resources & bits) != bits);

      mutex_lock(&dev->lock);
      fh->resources  &= ~bits;
      vv->resources &= ~bits;
      DEB_D(("res: put 0x%02x, cur:0x%02x\n",bits,vv->resources));
      mutex_unlock(&dev->lock);
}


/********************************************************************************/
/* common dma functions */

void saa7146_dma_free(struct saa7146_dev *dev,struct videobuf_queue *q,
                                    struct saa7146_buf *buf)
{
      struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
      DEB_EE(("dev:%p, buf:%p\n",dev,buf));

      BUG_ON(in_interrupt());

      videobuf_waiton(&buf->vb,0,0);
      videobuf_dma_unmap(q, dma);
      videobuf_dma_free(dma);
      buf->vb.state = STATE_NEEDS_INIT;
}


/********************************************************************************/
/* common buffer functions */

int saa7146_buffer_queue(struct saa7146_dev *dev,
                   struct saa7146_dmaqueue *q,
                   struct saa7146_buf *buf)
{
      assert_spin_locked(&dev->slock);
      DEB_EE(("dev:%p, dmaq:%p, buf:%p\n", dev, q, buf));

      BUG_ON(!q);

      if (NULL == q->curr) {
            q->curr = buf;
            DEB_D(("immediately activating buffer %p\n", buf));
            buf->activate(dev,buf,NULL);
      } else {
            list_add_tail(&buf->vb.queue,&q->queue);
            buf->vb.state = STATE_QUEUED;
            DEB_D(("adding buffer %p to queue. (active buffer present)\n", buf));
      }
      return 0;
}

void saa7146_buffer_finish(struct saa7146_dev *dev,
                     struct saa7146_dmaqueue *q,
                     int state)
{
      assert_spin_locked(&dev->slock);
      DEB_EE(("dev:%p, dmaq:%p, state:%d\n", dev, q, state));
      DEB_EE(("q->curr:%p\n",q->curr));

      BUG_ON(!q->curr);

      /* finish current buffer */
      if (NULL == q->curr) {
            DEB_D(("aiii. no current buffer\n"));
            return;
      }

      q->curr->vb.state = state;
      do_gettimeofday(&q->curr->vb.ts);
      wake_up(&q->curr->vb.done);

      q->curr = NULL;
}

void saa7146_buffer_next(struct saa7146_dev *dev,
                   struct saa7146_dmaqueue *q, int vbi)
{
      struct saa7146_buf *buf,*next = NULL;

      BUG_ON(!q);

      DEB_INT(("dev:%p, dmaq:%p, vbi:%d\n", dev, q, vbi));

      assert_spin_locked(&dev->slock);
      if (!list_empty(&q->queue)) {
            /* activate next one from queue */
            buf = list_entry(q->queue.next,struct saa7146_buf,vb.queue);
            list_del(&buf->vb.queue);
            if (!list_empty(&q->queue))
                  next = list_entry(q->queue.next,struct saa7146_buf, vb.queue);
            q->curr = buf;
            DEB_INT(("next buffer: buf:%p, prev:%p, next:%p\n", buf, q->queue.prev,q->queue.next));
            buf->activate(dev,buf,next);
      } else {
            DEB_INT(("no next buffer. stopping.\n"));
            if( 0 != vbi ) {
                  /* turn off video-dma3 */
                  saa7146_write(dev,MC1, MASK_20);
            } else {
                  /* nothing to do -- just prevent next video-dma1 transfer
                     by lowering the protection address */

                  // fixme: fix this for vflip != 0

                  saa7146_write(dev, PROT_ADDR1, 0);
                  saa7146_write(dev, MC2, (MASK_02|MASK_18));

                  /* write the address of the rps-program */
                  saa7146_write(dev, RPS_ADDR0, dev->d_rps0.dma_handle);
                  /* turn on rps */
                  saa7146_write(dev, MC1, (MASK_12 | MASK_28));

/*
                  printk("vdma%d.base_even:     0x%08x\n", 1,saa7146_read(dev,BASE_EVEN1));
                  printk("vdma%d.base_odd:      0x%08x\n", 1,saa7146_read(dev,BASE_ODD1));
                  printk("vdma%d.prot_addr:     0x%08x\n", 1,saa7146_read(dev,PROT_ADDR1));
                  printk("vdma%d.base_page:     0x%08x\n", 1,saa7146_read(dev,BASE_PAGE1));
                  printk("vdma%d.pitch:         0x%08x\n", 1,saa7146_read(dev,PITCH1));
                  printk("vdma%d.num_line_byte: 0x%08x\n", 1,saa7146_read(dev,NUM_LINE_BYTE1));
*/
            }
            del_timer(&q->timeout);
      }
}

void saa7146_buffer_timeout(unsigned long data)
{
      struct saa7146_dmaqueue *q = (struct saa7146_dmaqueue*)data;
      struct saa7146_dev *dev = q->dev;
      unsigned long flags;

      DEB_EE(("dev:%p, dmaq:%p\n", dev, q));

      spin_lock_irqsave(&dev->slock,flags);
      if (q->curr) {
            DEB_D(("timeout on %p\n", q->curr));
            saa7146_buffer_finish(dev,q,STATE_ERROR);
      }

      /* we don't restart the transfer here like other drivers do. when
         a streaming capture is disabled, the timeout function will be
         called for the current buffer. if we activate the next buffer now,
         we mess up our capture logic. if a timeout occurs on another buffer,
         then something is seriously broken before, so no need to buffer the
         next capture IMHO... */
/*
      saa7146_buffer_next(dev,q);
*/
      spin_unlock_irqrestore(&dev->slock,flags);
}

/********************************************************************************/
/* file operations */

static int fops_open(struct inode *inode, struct file *file)
{
      unsigned int minor = iminor(inode);
      struct saa7146_dev *h = NULL, *dev = NULL;
      struct list_head *list;
      struct saa7146_fh *fh = NULL;
      int result = 0;

      enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

      DEB_EE(("inode:%p, file:%p, minor:%d\n",inode,file,minor));

      if (mutex_lock_interruptible(&saa7146_devices_lock))
            return -ERESTARTSYS;

      list_for_each(list,&saa7146_devices) {
            h = list_entry(list, struct saa7146_dev, item);
            if( NULL == h->vv_data ) {
                  DEB_D(("device %p has not registered video devices.\n",h));
                  continue;
            }
            DEB_D(("trying: %p @ major %d,%d\n",h,h->vv_data->video_minor,h->vv_data->vbi_minor));

            if (h->vv_data->video_minor == minor) {
                  dev = h;
            }
            if (h->vv_data->vbi_minor == minor) {
                  type = V4L2_BUF_TYPE_VBI_CAPTURE;
                  dev = h;
            }
      }
      if (NULL == dev) {
            DEB_S(("no such video device.\n"));
            result = -ENODEV;
            goto out;
      }

      DEB_D(("using: %p\n",dev));

      /* check if an extension is registered */
      if( NULL == dev->ext ) {
            DEB_S(("no extension registered for this device.\n"));
            result = -ENODEV;
            goto out;
      }

      /* allocate per open data */
      fh = kzalloc(sizeof(*fh),GFP_KERNEL);
      if (NULL == fh) {
            DEB_S(("cannot allocate memory for per open data.\n"));
            result = -ENOMEM;
            goto out;
      }

      file->private_data = fh;
      fh->dev = dev;
      fh->type = type;

      if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
            DEB_S(("initializing vbi...\n"));
            if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
                  result = saa7146_vbi_uops.open(dev,file);
            if (dev->ext_vv_data->vbi_fops.open)
                  dev->ext_vv_data->vbi_fops.open(inode, file);
      } else {
            DEB_S(("initializing video...\n"));
            result = saa7146_video_uops.open(dev,file);
      }

      if (0 != result) {
            goto out;
      }

      if( 0 == try_module_get(dev->ext->module)) {
            result = -EINVAL;
            goto out;
      }

      result = 0;
out:
      if( fh != 0 && result != 0 ) {
            kfree(fh);
            file->private_data = NULL;
      }
      mutex_unlock(&saa7146_devices_lock);
      return result;
}

static int fops_release(struct inode *inode, struct file *file)
{
      struct saa7146_fh  *fh  = file->private_data;
      struct saa7146_dev *dev = fh->dev;

      DEB_EE(("inode:%p, file:%p\n",inode,file));

      if (mutex_lock_interruptible(&saa7146_devices_lock))
            return -ERESTARTSYS;

      if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
            if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
                  saa7146_vbi_uops.release(dev,file);
            if (dev->ext_vv_data->vbi_fops.release)
                  dev->ext_vv_data->vbi_fops.release(inode, file);
      } else {
            saa7146_video_uops.release(dev,file);
      }

      module_put(dev->ext->module);
      file->private_data = NULL;
      kfree(fh);

      mutex_unlock(&saa7146_devices_lock);

      return 0;
}

static int fops_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
/*
      DEB_EE(("inode:%p, file:%p, cmd:%d, arg:%li\n",inode, file, cmd, arg));
*/
      return video_usercopy(inode, file, cmd, arg, saa7146_video_do_ioctl);
}

static int fops_mmap(struct file *file, struct vm_area_struct * vma)
{
      struct saa7146_fh *fh = file->private_data;
      struct videobuf_queue *q;

      switch (fh->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
            DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, vma:%p\n",file, vma));
            q = &fh->video_q;
            break;
            }
      case V4L2_BUF_TYPE_VBI_CAPTURE: {
            DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, vma:%p\n",file, vma));
            q = &fh->vbi_q;
            break;
            }
      default:
            BUG();
            return 0;
      }

      return videobuf_mmap_mapper(q,vma);
}

static unsigned int fops_poll(struct file *file, struct poll_table_struct *wait)
{
      struct saa7146_fh *fh = file->private_data;
      struct videobuf_buffer *buf = NULL;
      struct videobuf_queue *q;

      DEB_EE(("file:%p, poll:%p\n",file, wait));

      if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) {
            if( 0 == fh->vbi_q.streaming )
                  return videobuf_poll_stream(file, &fh->vbi_q, wait);
            q = &fh->vbi_q;
      } else {
            DEB_D(("using video queue.\n"));
            q = &fh->video_q;
      }

      if (!list_empty(&q->stream))
            buf = list_entry(q->stream.next, struct videobuf_buffer, stream);

      if (!buf) {
            DEB_D(("buf == NULL!\n"));
            return POLLERR;
      }

      poll_wait(file, &buf->done, wait);
      if (buf->state == STATE_DONE || buf->state == STATE_ERROR) {
            DEB_D(("poll succeeded!\n"));
            return POLLIN|POLLRDNORM;
      }

      DEB_D(("nothing to poll for, buf->state:%d\n",buf->state));
      return 0;
}

static ssize_t fops_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
{
      struct saa7146_fh *fh = file->private_data;

      switch (fh->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
//          DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, data:%p, count:%lun", file, data, (unsigned long)count));
            return saa7146_video_uops.read(file,data,count,ppos);
            }
      case V4L2_BUF_TYPE_VBI_CAPTURE: {
//          DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, data:%p, count:%lu\n", file, data, (unsigned long)count));
            if (fh->dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
                  return saa7146_vbi_uops.read(file,data,count,ppos);
            else
                  return -EINVAL;
            }
            break;
      default:
            BUG();
            return 0;
      }
}

static ssize_t fops_write(struct file *file, const char __user *data, size_t count, loff_t *ppos)
{
      struct saa7146_fh *fh = file->private_data;

      switch (fh->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE:
            return -EINVAL;
      case V4L2_BUF_TYPE_VBI_CAPTURE:
            if (fh->dev->ext_vv_data->vbi_fops.write)
                  return fh->dev->ext_vv_data->vbi_fops.write(file, data, count, ppos);
            else
                  return -EINVAL;
      default:
            BUG();
            return -EINVAL;
      }
}

static const struct file_operations video_fops =
{
      .owner            = THIS_MODULE,
      .open       = fops_open,
      .release    = fops_release,
      .read       = fops_read,
      .write            = fops_write,
      .poll       = fops_poll,
      .mmap       = fops_mmap,
      .ioctl            = fops_ioctl,
      .llseek           = no_llseek,
};

static void vv_callback(struct saa7146_dev *dev, unsigned long status)
{
      u32 isr = status;

      DEB_INT(("dev:%p, isr:0x%08x\n",dev,(u32)status));

      if (0 != (isr & (MASK_27))) {
            DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
            saa7146_video_uops.irq_done(dev,isr);
      }

      if (0 != (isr & (MASK_28))) {
            u32 mc2 = saa7146_read(dev, MC2);
            if( 0 != (mc2 & MASK_15)) {
                  DEB_INT(("irq: RPS1 vbi workaround (0x%08x).\n",isr));
                  wake_up(&dev->vv_data->vbi_wq);
                  saa7146_write(dev,MC2, MASK_31);
                  return;
            }
            DEB_INT(("irq: RPS1 (0x%08x).\n",isr));
            saa7146_vbi_uops.irq_done(dev,isr);
      }
}

static struct video_device device_template =
{
      .fops       = &video_fops,
      .minor            = -1,
};

int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
{
      struct saa7146_vv *vv = kzalloc (sizeof(struct saa7146_vv),GFP_KERNEL);
      if( NULL == vv ) {
            ERR(("out of memory. aborting.\n"));
            return -1;
      }

      DEB_EE(("dev:%p\n",dev));

      /* set default values for video parts of the saa7146 */
      saa7146_write(dev, BCS_CTRL, 0x80400040);

      /* enable video-port pins */
      saa7146_write(dev, MC1, (MASK_10 | MASK_26));

      /* save per-device extension data (one extension can
         handle different devices that might need different
         configuration data) */
      dev->ext_vv_data = ext_vv;

      vv->video_minor = -1;
      vv->vbi_minor = -1;

      vv->d_clipping.cpu_addr = pci_alloc_consistent(dev->pci, SAA7146_CLIPPING_MEM, &vv->d_clipping.dma_handle);
      if( NULL == vv->d_clipping.cpu_addr ) {
            ERR(("out of memory. aborting.\n"));
            kfree(vv);
            return -1;
      }
      memset(vv->d_clipping.cpu_addr, 0x0, SAA7146_CLIPPING_MEM);

      saa7146_video_uops.init(dev,vv);
      if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
            saa7146_vbi_uops.init(dev,vv);

      dev->vv_data = vv;
      dev->vv_callback = &vv_callback;

      return 0;
}
EXPORT_SYMBOL_GPL(saa7146_vv_init);

int saa7146_vv_release(struct saa7146_dev* dev)
{
      struct saa7146_vv *vv = dev->vv_data;

      DEB_EE(("dev:%p\n",dev));

      pci_free_consistent(dev->pci, SAA7146_CLIPPING_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
      kfree(vv);
      dev->vv_data = NULL;
      dev->vv_callback = NULL;

      return 0;
}
EXPORT_SYMBOL_GPL(saa7146_vv_release);

int saa7146_register_device(struct video_device **vid, struct saa7146_dev* dev,
                      char *name, int type)
{
      struct saa7146_vv *vv = dev->vv_data;
      struct video_device *vfd;

      DEB_EE(("dev:%p, name:'%s', type:%d\n",dev,name,type));

      // released by vfd->release
      vfd = video_device_alloc();
      if (vfd == NULL)
            return -ENOMEM;

      memcpy(vfd, &device_template, sizeof(struct video_device));
      strlcpy(vfd->name, name, sizeof(vfd->name));
      vfd->release = video_device_release;
      vfd->priv = dev;

      // fixme: -1 should be an insmod parameter *for the extension* (like "video_nr");
      if (video_register_device(vfd, type, -1) < 0) {
            ERR(("cannot register v4l2 device. skipping.\n"));
            return -1;
      }

      if( VFL_TYPE_GRABBER == type ) {
            vv->video_minor = vfd->minor;
            INFO(("%s: registered device video%d [v4l2]\n",
                  dev->name, vfd->minor & 0x1f));
      } else {
            vv->vbi_minor = vfd->minor;
            INFO(("%s: registered device vbi%d [v4l2]\n",
                  dev->name, vfd->minor & 0x1f));
      }

      *vid = vfd;
      return 0;
}
EXPORT_SYMBOL_GPL(saa7146_register_device);

int saa7146_unregister_device(struct video_device **vid, struct saa7146_dev* dev)
{
      struct saa7146_vv *vv = dev->vv_data;

      DEB_EE(("dev:%p\n",dev));

      if( VFL_TYPE_GRABBER == (*vid)->type ) {
            vv->video_minor = -1;
      } else {
            vv->vbi_minor = -1;
      }

      video_unregister_device(*vid);
      *vid = NULL;

      return 0;
}
EXPORT_SYMBOL_GPL(saa7146_unregister_device);

static int __init saa7146_vv_init_module(void)
{
      return 0;
}


static void __exit saa7146_vv_cleanup_module(void)
{
}

module_init(saa7146_vv_init_module);
module_exit(saa7146_vv_cleanup_module);

MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
MODULE_LICENSE("GPL");

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