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#include <linuxcomp.h>

#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)
                /* have it already allocated */
                return 1;

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

int saa7146_res_check(struct saa7146_fh *fh, unsigned int bit)
{
        return (fh->resources & bit);
}

int saa7146_res_locked(struct saa7146_dev *dev, unsigned int bit)
{
        struct saa7146_vv *vv = dev->vv_data;
        return (vv->resources & bit);
}

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

        if ((fh->resources & bits) != bits)
                BUG();

        DEB_D(("getting lock...\n"));
        //down(&dev->lock);
        DEB_D(("got lock\n"));
        fh->resources  &= ~bits;
        vv->resources &= ~bits;
        DEB_D(("res: put %d\n",bits));
        //up(&dev->lock);
}


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

void saa7146_dma_free(struct saa7146_dev *dev,struct saa7146_buf *buf)
{
        DEB_EE(("dev:%p, buf:%p\n",dev,buf));

        if (in_interrupt())
                BUG();

        videobuf_waiton(&buf->vb,0,0);
        //videobuf_dma_pci_unmap(dev->pci, &buf->vb.dma);
        //videobuf_dma_free(&buf->vb.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)
{
#if DEBUG_SPINLOCKS
        BUG_ON(!spin_is_locked(&dev->slock));
#endif
        DEB_EE(("dev:%p, dmaq:%p, buf:%p\n", dev, q, buf));

        if( NULL == q ) {
                ERR(("internal error: fatal NULL pointer for q.\n"));
                return 0;
        }

        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)
{
#if DEBUG_SPINLOCKS
        BUG_ON(!spin_is_locked(&dev->slock));
#endif
        if( NULL == q->curr ) {
                ERR(("internal error: fatal NULL pointer for q->curr.\n"));
                return;
        }

        DEB_EE(("dev:%p, dmaq:%p, state:%d\n", dev, q, state));
        DEB_EE(("q->curr:%p\n",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;

        if( NULL == q ) {
                ERR(("internal error: fatal NULL pointer for q.\n"));
                return;
        }

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

#if DEBUG_SPINLOCKS
        BUG_ON(!spin_is_locked(&dev->slock));
#endif
        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 (down_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 = kmalloc(sizeof(*fh),GFP_KERNEL);
        if (NULL == fh) {
                DEB_S(("cannot allocate memory for per open data.\n"));
                result = -ENOMEM;
                goto out;
        }
        memset(fh,0,sizeof(*fh));
       
        file->private_data = fh;
        fh->dev = dev;
        fh->type = type;

        if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
                DEB_S(("initializing vbi...\n"));
                result = 0;//saa7146_vbi_uops.open(dev,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;
        }
        //up(&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 (down_interruptible(&saa7146_devices_lock))
        //      return -ERESTARTSYS;

        if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
                //saa7146_vbi_uops.release(dev,file);
        } else {
                saa7146_video_uops.release(dev,file);
        }

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

        //up(&saa7146_devices_lock);

        return 0;
}

int saa7146_video_do_ioctl(struct inode *inode, struct file *file, unsigned int cmd, void *arg);
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(vma,q);
}

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 *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));
                return 0;//saa7146_vbi_uops.read(file,data,count,ppos);
                }
                break;
        default:
                BUG();
                return 0;
        }
}

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

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 =
{
        .hardware       = VID_HARDWARE_SAA7146,
        .fops           = &video_fops,
        .minor          = -1,
};

int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
{
        struct saa7146_vv *vv = kmalloc (sizeof(struct saa7146_vv),GFP_KERNEL);
        if( NULL == vv ) {
                ERR(("out of memory. aborting.\n"));
                return -1;
        }
        memset(vv, 0x0, sizeof(*vv));

        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);
        //saa7146_vbi_uops.init(dev,vv);
       
        dev->vv_data = vv;
        dev->vv_callback = &vv_callback;

        return 0;
}

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_RPS_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
        kfree(vv);
        dev->vv_data = NULL;
        dev->vv_callback = NULL;
       
        return 0;
}

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

        DEB_EE(("dev:%p, name:'%s', type:%d\n",dev,name,type));
 
        *vid = device_template;
        strncpy(vid->name, name, sizeof(vid->name));
        vid->priv = dev;

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

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

        return 0;
}

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);

        return 0;
}

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");