text: /*
   *  Driver for the Conexant CX25821 PCIe bridge
   *
   *  Copyright (C) 2009 Conexant Systems Inc.
   *  Authors  <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
   *  Based on Steven Toth <stoth@linuxtv.org> cx23885 driver
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; either version 2 of the License, or
   *  (at your option) any later version.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *  along with this program; if not, write to the Free Software
   *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  #include "cx25821-video.h"
  
  static void buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
  {
  	struct cx25821_buffer *buf =
  	    container_of(vb, struct cx25821_buffer, vb);
  	struct cx25821_buffer *prev;
  	struct cx25821_fh *fh = vq->priv_data;
  	struct cx25821_dev *dev = fh->dev;
  	struct cx25821_dmaqueue *q = &dev->vidq[SRAM_CH10];
  
  	/* add jump to stopper */
  	buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
  	buf->risc.jmp[1] = cpu_to_le32(q->stopper.dma);
  	buf->risc.jmp[2] = cpu_to_le32(0);	/* bits 63-32 */
  
  	dprintk(2, "jmp to stopper (0x%x)\n", buf->risc.jmp[1]);
  
  	if (!list_empty(&q->queued)) {
  		list_add_tail(&buf->vb.queue, &q->queued);
  		buf->vb.state = VIDEOBUF_QUEUED;
  		dprintk(2, "[%p/%d] buffer_queue - append to queued\n", buf,
  			buf->vb.i);
  
  	} else if (list_empty(&q->active)) {
  		list_add_tail(&buf->vb.queue, &q->active);
  		cx25821_start_video_dma(dev, q, buf,
  					&dev->sram_channels[SRAM_CH10]);
  		buf->vb.state = VIDEOBUF_ACTIVE;
  		buf->count = q->count++;
  		mod_timer(&q->timeout, jiffies + BUFFER_TIMEOUT);
  		dprintk(2,
  			"[%p/%d] buffer_queue - first active, buf cnt = %d, q->count = %d\n",
  			buf, buf->vb.i, buf->count, q->count);
  	} else {
  		prev =
  		    list_entry(q->active.prev, struct cx25821_buffer, vb.queue);
  		if (prev->vb.width == buf->vb.width
  		    && prev->vb.height == buf->vb.height
  		    && prev->fmt == buf->fmt) {
  			list_add_tail(&buf->vb.queue, &q->active);
  			buf->vb.state = VIDEOBUF_ACTIVE;
  			buf->count = q->count++;
  			prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
  
  			/* 64 bit bits 63-32 */
  			prev->risc.jmp[2] = cpu_to_le32(0);
  			dprintk(2,
  				"[%p/%d] buffer_queue - append to active, buf->count=%d\n",
  				buf, buf->vb.i, buf->count);
  
  		} else {
  			list_add_tail(&buf->vb.queue, &q->queued);
  			buf->vb.state = VIDEOBUF_QUEUED;
  			dprintk(2, "[%p/%d] buffer_queue - first queued\n", buf,
  				buf->vb.i);
  		}
  	}
  
  	if (list_empty(&q->active)) {
  		dprintk(2, "active queue empty!\n");
  	}
  }
  
  static struct videobuf_queue_ops cx25821_video_qops = {
  	.buf_setup = buffer_setup,
  	.buf_prepare = buffer_prepare,
  	.buf_queue = buffer_queue,
  	.buf_release = buffer_release,
  };
  
  static int video_open(struct file *file)
  {
  	struct video_device *vdev = video_devdata(file);
  	struct cx25821_dev *dev = video_drvdata(file);
  	struct cx25821_fh *fh;
  	enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
  
  	printk("open dev=%s type=%s\n", video_device_node_name(vdev),
  		v4l2_type_names[type]);
  
  	/* allocate + initialize per filehandle data */
  	fh = kzalloc(sizeof(*fh), GFP_KERNEL);
  	if (NULL == fh)
  		return -ENOMEM;
  
  	lock_kernel();
  
  	file->private_data = fh;
  	fh->dev = dev;
  	fh->type = type;
  	fh->width = 720;
  
  	if (dev->tvnorm & V4L2_STD_PAL_BG || dev->tvnorm & V4L2_STD_PAL_DK)
  		fh->height = 576;
  	else
  		fh->height = 480;
  
  	dev->channel_opened = 9;
  	fh->fmt = format_by_fourcc(V4L2_PIX_FMT_YUYV);
  
  	v4l2_prio_open(&dev->prio, &fh->prio);
  
  	videobuf_queue_sg_init(&fh->vidq, &cx25821_video_qops,
  			       &dev->pci->dev, &dev->slock,
  			       V4L2_BUF_TYPE_VIDEO_CAPTURE,
  			       V4L2_FIELD_INTERLACED,
  			       sizeof(struct cx25821_buffer), fh);
  
  	dprintk(1, "post videobuf_queue_init()\n");
  	unlock_kernel();
  
  	return 0;
  }
  
  static ssize_t video_read(struct file *file, char __user * data, size_t count,
  			  loff_t * ppos)
  {
  	struct cx25821_fh *fh = file->private_data;
  
  	switch (fh->type) {
  	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
  		if (res_locked(fh->dev, RESOURCE_VIDEO10))
  			return -EBUSY;
  
  		return videobuf_read_one(&fh->vidq, data, count, ppos,
  					 file->f_flags & O_NONBLOCK);
  
  	default:
  		BUG();
  		return 0;
  	}
  }
  
  static unsigned int video_poll(struct file *file,
  			       struct poll_table_struct *wait)
  {
  	struct cx25821_fh *fh = file->private_data;
  	struct cx25821_buffer *buf;
  
  	if (res_check(fh, RESOURCE_VIDEO10)) {
  		/* streaming capture */
  		if (list_empty(&fh->vidq.stream))
  			return POLLERR;
  		buf = list_entry(fh->vidq.stream.next,
  				 struct cx25821_buffer, vb.stream);
  	} else {
  		/* read() capture */
  		buf = (struct cx25821_buffer *)fh->vidq.read_buf;
  		if (NULL == buf)
  			return POLLERR;
  	}
  
  	poll_wait(file, &buf->vb.done, wait);
  	if (buf->vb.state == VIDEOBUF_DONE || buf->vb.state == VIDEOBUF_ERROR)
  		return POLLIN | POLLRDNORM;
  	return 0;
  }
  
  static int video_release(struct file *file)
  {
  	struct cx25821_fh *fh = file->private_data;
  	struct cx25821_dev *dev = fh->dev;
  
  	//stop the risc engine and fifo
  	//cx_write(channel10->dma_ctl, 0);
  
  	/* stop video capture */
  	if (res_check(fh, RESOURCE_VIDEO10)) {
  		videobuf_queue_cancel(&fh->vidq);
  		res_free(dev, fh, RESOURCE_VIDEO10);
  	}
  
  	if (fh->vidq.read_buf) {
  		buffer_release(&fh->vidq, fh->vidq.read_buf);
  		kfree(fh->vidq.read_buf);
  	}
  
  	videobuf_mmap_free(&fh->vidq);
  
  	v4l2_prio_close(&dev->prio, &fh->prio);
  
  	file->private_data = NULL;
  	kfree(fh);
  
  	return 0;
  }
  
  static int vidioc_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
  {
  	struct cx25821_fh *fh = priv;
  	struct cx25821_dev *dev = fh->dev;
  
  	if (unlikely(fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)) {
  		return -EINVAL;
  	}
  
  	if (unlikely(i != fh->type)) {
  		return -EINVAL;
  	}
  
  	if (unlikely(!res_get(dev, fh, get_resource(fh, RESOURCE_VIDEO10)))) {
  		return -EBUSY;
  	}
  
  	return videobuf_streamon(get_queue(fh));
  }
  
  static int vidioc_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
  {
  	struct cx25821_fh *fh = priv;
  	struct cx25821_dev *dev = fh->dev;
  	int err, res;
  
  	if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
  		return -EINVAL;
  	if (i != fh->type)
  		return -EINVAL;
  
  	res = get_resource(fh, RESOURCE_VIDEO10);
  	err = videobuf_streamoff(get_queue(fh));
  	if (err < 0)
  		return err;
  	res_free(dev, fh, res);
  	return 0;
  }
  
  static long video_ioctl_upstream10(struct file *file, unsigned int cmd,
  				   unsigned long arg)
  {
  	struct cx25821_fh *fh = file->private_data;
  	struct cx25821_dev *dev = fh->dev;
  	int command = 0;
  	struct upstream_user_struct *data_from_user;
  
  	data_from_user = (struct upstream_user_struct *)arg;
  
  	if (!data_from_user) {
  		printk
  		    ("cx25821 in %s(): Upstream data is INVALID. Returning.\n",
  		     __func__);
  		return 0;
  	}
  
  	command = data_from_user->command;
  
  	if (command != UPSTREAM_START_VIDEO && command != UPSTREAM_STOP_VIDEO) {
  		return 0;
  	}
  
  	dev->input_filename_ch2 = data_from_user->input_filename;
  	dev->input_audiofilename = data_from_user->input_filename;
  	dev->vid_stdname_ch2 = data_from_user->vid_stdname;
  	dev->pixel_format_ch2 = data_from_user->pixel_format;
  	dev->channel_select_ch2 = data_from_user->channel_select;
  	dev->command_ch2 = data_from_user->command;
  
  	switch (command) {
  	case UPSTREAM_START_VIDEO:
  		cx25821_start_upstream_video_ch2(dev, data_from_user);
  		break;
  
  	case UPSTREAM_STOP_VIDEO:
  		cx25821_stop_upstream_video_ch2(dev);
  		break;
  	}
  
  	return 0;
  }
  
  static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
  				struct v4l2_format *f)
  {
  	struct cx25821_fh *fh = priv;
  	struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
  	int err;
  
  	if (fh) {
  		err = v4l2_prio_check(&dev->prio, &fh->prio);
  		if (0 != err)
  			return err;
  	}
  
  	dprintk(2, "%s()\n", __func__);
  	err = vidioc_try_fmt_vid_cap(file, priv, f);
  
  	if (0 != err)
  		return err;
  	fh->fmt = format_by_fourcc(f->fmt.pix.pixelformat);
  	fh->width = f->fmt.pix.width;
  	fh->height = f->fmt.pix.height;
  	fh->vidq.field = f->fmt.pix.field;
  	dprintk(2, "%s() width=%d height=%d field=%d\n", __func__, fh->width,
  		fh->height, fh->vidq.field);
  	cx25821_call_all(dev, video, s_fmt, f);
  	return 0;
  }
  
  static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
  {
  	struct cx25821_fh *fh = priv;
  	return videobuf_dqbuf(get_queue(fh), p, file->f_flags & O_NONBLOCK);
  }
  
  static int vidioc_log_status(struct file *file, void *priv)
  {
  	struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
  	char name[32 + 2];
  
  	snprintf(name, sizeof(name), "%s/2", dev->name);
  	printk(KERN_INFO "%s/2: ============  START LOG STATUS  ============\n",
  	       dev->name);
  	cx25821_call_all(dev, core, log_status);
  	printk(KERN_INFO "%s/2: =============  END LOG STATUS  =============\n",
  	       dev->name);
  	return 0;
  }
  
  static int vidioc_s_ctrl(struct file *file, void *priv,
  			 struct v4l2_control *ctl)
  {
  	struct cx25821_fh *fh = priv;
  	struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
  	int err;
  
  	if (fh) {
  		err = v4l2_prio_check(&dev->prio, &fh->prio);
  		if (0 != err)
  			return err;
  	}
  
  	return 0;
  }
  
  //exported stuff
  static const struct v4l2_file_operations video_fops = {
  	.owner = THIS_MODULE,
  	.open = video_open,
  	.release = video_release,
  	.read = video_read,
  	.poll = video_poll,
  	.mmap = video_mmap,
  	.ioctl = video_ioctl_upstream10,
  };
  
  static const struct v4l2_ioctl_ops video_ioctl_ops = {
  	.vidioc_querycap = vidioc_querycap,
  	.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
  	.vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
  	.vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
  	.vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
  	.vidioc_reqbufs = vidioc_reqbufs,
  	.vidioc_querybuf = vidioc_querybuf,
  	.vidioc_qbuf = vidioc_qbuf,
  	.vidioc_dqbuf = vidioc_dqbuf,
  #ifdef TUNER_FLAG
  	.vidioc_s_std = vidioc_s_std,
  	.vidioc_querystd = vidioc_querystd,
  #endif
  	.vidioc_cropcap = vidioc_cropcap,
  	.vidioc_s_crop = vidioc_s_crop,
  	.vidioc_g_crop = vidioc_g_crop,
  	.vidioc_enum_input = vidioc_enum_input,
  	.vidioc_g_input = vidioc_g_input,
  	.vidioc_s_input = vidioc_s_input,
  	.vidioc_g_ctrl = vidioc_g_ctrl,
  	.vidioc_s_ctrl = vidioc_s_ctrl,
  	.vidioc_queryctrl = vidioc_queryctrl,
  	.vidioc_streamon = vidioc_streamon,
  	.vidioc_streamoff = vidioc_streamoff,
  	.vidioc_log_status = vidioc_log_status,
  	.vidioc_g_priority = vidioc_g_priority,
  	.vidioc_s_priority = vidioc_s_priority,
  #ifdef CONFIG_VIDEO_V4L1_COMPAT
  	.vidiocgmbuf = vidiocgmbuf,
  #endif
  #ifdef TUNER_FLAG
  	.vidioc_g_tuner = vidioc_g_tuner,
  	.vidioc_s_tuner = vidioc_s_tuner,
  	.vidioc_g_frequency = vidioc_g_frequency,
  	.vidioc_s_frequency = vidioc_s_frequency,
  #endif
  #ifdef CONFIG_VIDEO_ADV_DEBUG
  	.vidioc_g_register = vidioc_g_register,
  	.vidioc_s_register = vidioc_s_register,
  #endif
  };
  
  struct video_device cx25821_video_template10 = {
  	.name = "cx25821-upstream10",
  	.fops = &video_fops,
  	.ioctl_ops = &video_ioctl_ops,
  	.tvnorms = CX25821_NORMS,
  	.current_norm = V4L2_STD_NTSC_M,
  };
  