soc_camera.c

trident tm5600的linux驱动

/*
 * camera image capture (abstract) bus driver
 *
 * Copyright (C) 2008, Guennadi Liakhovetski <[e-mail]>
 *
 * This driver provides an interface between platform-specific camera
 * busses and camera devices. It should be used if the camera is
 * connected not over a "proper" bus like PCI or USB, but over a
 * special bus, like, for example, the Quick Capture interface on PXA270
 * SoCs. Later it should also be used for i.MX31 SoCs from Freescale.
 * It can handle multiple cameras and / or multiple busses, which can
 * be used, e.g., in stereo-vision applications.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/vmalloc.h>

#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-dev.h>
#include <media/videobuf-core.h>
#include <media/soc_camera.h>

static LIST_HEAD(hosts);
static LIST_HEAD(devices);
static DEFINE_MUTEX(list_lock);
static DEFINE_MUTEX(video_lock);

const static struct soc_camera_data_format*
format_by_fourcc(struct soc_camera_device *icd, unsigned int fourcc)
{
	unsigned int i;

	for (i = 0; i < icd->num_formats; i++)
		if (icd->formats[i].fourcc == fourcc)
			return icd->formats + i;
	return NULL;
}

static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
				  struct v4l2_format *f)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;
	struct soc_camera_host *ici =
		to_soc_camera_host(icd->dev.parent);
	enum v4l2_field field;
	const struct soc_camera_data_format *fmt;
	int ret;

	WARN_ON(priv != file->private_data);

	fmt = format_by_fourcc(icd, f->fmt.pix.pixelformat);
	if (!fmt) {
		dev_dbg(&icd->dev, "invalid format 0x%08x\n",
			f->fmt.pix.pixelformat);
		return -EINVAL;
	}

	dev_dbg(&icd->dev, "fmt: 0x%08x\n", fmt->fourcc);

	field = f->fmt.pix.field;

	if (field == V4L2_FIELD_ANY) {
		field = V4L2_FIELD_NONE;
	} else if (V4L2_FIELD_NONE != field) {
		dev_err(&icd->dev, "Field type invalid.\n");
		return -EINVAL;
	}

	/* test physical bus parameters */
	ret = ici->ops->try_bus_param(icd, f->fmt.pix.pixelformat);
	if (ret)
		return ret;

	/* limit format to hardware capabilities */
	ret = ici->ops->try_fmt_cap(icd, f);

	/* calculate missing fields */
	f->fmt.pix.field = field;
	f->fmt.pix.bytesperline =
		(f->fmt.pix.width * fmt->depth) >> 3;
	f->fmt.pix.sizeimage =
		f->fmt.pix.height * f->fmt.pix.bytesperline;

	return ret;
}

static int soc_camera_enum_input(struct file *file, void *priv,
				 struct v4l2_input *inp)
{
	if (inp->index != 0)
		return -EINVAL;

	inp->type = V4L2_INPUT_TYPE_CAMERA;
	inp->std = V4L2_STD_UNKNOWN;
	strcpy(inp->name, "Camera");

	return 0;
}

static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
{
	*i = 0;

	return 0;
}

static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
{
	if (i > 0)
		return -EINVAL;

	return 0;
}

static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a)
{
	return 0;
}

static int soc_camera_reqbufs(struct file *file, void *priv,
			      struct v4l2_requestbuffers *p)
{
	int ret;
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;
	struct soc_camera_host *ici =
		to_soc_camera_host(icd->dev.parent);

	WARN_ON(priv != file->private_data);

	dev_dbg(&icd->dev, "%s: %d\n", __func__, p->memory);

	ret = videobuf_reqbufs(&icf->vb_vidq, p);
	if (ret < 0)
		return ret;

	return ici->ops->reqbufs(icf, p);
}

static int soc_camera_querybuf(struct file *file, void *priv,
			       struct v4l2_buffer *p)
{
	struct soc_camera_file *icf = file->private_data;

	WARN_ON(priv != file->private_data);

	return videobuf_querybuf(&icf->vb_vidq, p);
}

static int soc_camera_qbuf(struct file *file, void *priv,
			   struct v4l2_buffer *p)
{
	struct soc_camera_file *icf = file->private_data;

	WARN_ON(priv != file->private_data);

	return videobuf_qbuf(&icf->vb_vidq, p);
}

static int soc_camera_dqbuf(struct file *file, void *priv,
			    struct v4l2_buffer *p)
{
	struct soc_camera_file *icf = file->private_data;

	WARN_ON(priv != file->private_data);

	return videobuf_dqbuf(&icf->vb_vidq, p, file->f_flags & O_NONBLOCK);
}

static int soc_camera_open(struct inode *inode, struct file *file)
{
	struct video_device *vdev;
	struct soc_camera_device *icd;
	struct soc_camera_host *ici;
	struct soc_camera_file *icf;
	int ret;

	icf = vmalloc(sizeof(*icf));
	if (!icf)
		return -ENOMEM;

	/* Protect against icd->remove() until we module_get() both drivers. */
	mutex_lock(&video_lock);

	vdev = video_devdata(file);
	icd = container_of(vdev->parent, struct soc_camera_device, dev);
	ici = to_soc_camera_host(icd->dev.parent);

	if (!try_module_get(icd->ops->owner)) {
		dev_err(&icd->dev, "Couldn't lock sensor driver.\n");
		ret = -EINVAL;
		goto emgd;
	}

	if (!try_module_get(ici->ops->owner)) {
		dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
		ret = -EINVAL;
		goto emgi;
	}

	icf->icd = icd;
	icd->use_count++;

	/* Now we really have to activate the camera */
	if (icd->use_count == 1) {
		ret = ici->ops->add(icd);
		if (ret < 0) {
			dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
			icd->use_count--;
			goto eiciadd;
		}
	}

	mutex_unlock(&video_lock);

	file->private_data = icf;
	dev_dbg(&icd->dev, "camera device open\n");

	ici->ops->init_videobuf(&icf->vb_vidq, icd);

	return 0;

	/* All errors are entered with the video_lock held */
eiciadd:
	module_put(ici->ops->owner);
emgi:
	module_put(icd->ops->owner);
emgd:
	mutex_unlock(&video_lock);
	vfree(icf);
	return ret;
}

static int soc_camera_close(struct inode *inode, struct file *file)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;
	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
	struct video_device *vdev = icd->vdev;

	mutex_lock(&video_lock);
	icd->use_count--;
	if (!icd->use_count)
		ici->ops->remove(icd);
	module_put(icd->ops->owner);
	module_put(ici->ops->owner);
	mutex_unlock(&video_lock);

	vfree(icf);

	dev_dbg(vdev->parent, "camera device close\n");

	return 0;
}

static ssize_t soc_camera_read(struct file *file, char __user *buf,
			   size_t count, loff_t *ppos)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;
	struct video_device *vdev = icd->vdev;
	int err = -EINVAL;

	dev_err(vdev->parent, "camera device read not implemented\n");

	return err;
}

static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;
	int err;

	dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);

	err = videobuf_mmap_mapper(&icf->vb_vidq, vma);

	dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n",
		(unsigned long)vma->vm_start,
		(unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
		err);

	return err;
}

static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;
	struct soc_camera_host *ici =
		to_soc_camera_host(icd->dev.parent);

	if (list_empty(&icf->vb_vidq.stream)) {
		dev_err(&icd->dev, "Trying to poll with no queued buffers!\n");
		return POLLERR;
	}

	return ici->ops->poll(file, pt);
}


static struct file_operations soc_camera_fops = {
	.owner		= THIS_MODULE,
	.open		= soc_camera_open,
	.release	= soc_camera_close,
	.ioctl		= video_ioctl2,
	.read		= soc_camera_read,
	.mmap		= soc_camera_mmap,
	.poll		= soc_camera_poll,
	.llseek		= no_llseek,
};


static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
				struct v4l2_format *f)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;
	struct soc_camera_host *ici =
		to_soc_camera_host(icd->dev.parent);
	int ret;
	struct v4l2_rect rect;
	const static struct soc_camera_data_format *data_fmt;

	WARN_ON(priv != file->private_data);

	data_fmt = format_by_fourcc(icd, f->fmt.pix.pixelformat);
	if (!data_fmt)
		return -EINVAL;

	/* buswidth may be further adjusted by the ici */
	icd->buswidth = data_fmt->depth;

	ret = soc_camera_try_fmt_vid_cap(file, icf, f);
	if (ret < 0)
		return ret;

	rect.left	= icd->x_current;
	rect.top	= icd->y_current;
	rect.width	= f->fmt.pix.width;
	rect.height	= f->fmt.pix.height;
	ret = ici->ops->set_fmt_cap(icd, f->fmt.pix.pixelformat, &rect);
	if (ret < 0)
		return ret;

	icd->current_fmt	= data_fmt;
	icd->width		= rect.width;
	icd->height		= rect.height;
	icf->vb_vidq.field	= f->fmt.pix.field;
	if (V4L2_BUF_TYPE_VIDEO_CAPTURE != f->type)
		dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
			 f->type);

	dev_dbg(&icd->dev, "set width: %d height: %d\n",
		icd->width, icd->height);

	/* set physical bus parameters */
	return ici->ops->set_bus_param(icd, f->fmt.pix.pixelformat);
}

static int soc_camera_enum_fmt_vid_cap(struct file *file, void  *priv,
				   struct v4l2_fmtdesc *f)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;
	const struct soc_camera_data_format *format;

	WARN_ON(priv != file->private_data);

	if (f->index >= icd->num_formats)
		return -EINVAL;

	format = &icd->formats[f->index];

	strlcpy(f->description, format->name, sizeof(f->description));
	f->pixelformat = format->fourcc;
	return 0;
}

static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
				struct v4l2_format *f)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;

	WARN_ON(priv != file->private_data);

	f->fmt.pix.width	= icd->width;
	f->fmt.pix.height	= icd->height;
	f->fmt.pix.field	= icf->vb_vidq.field;
	f->fmt.pix.pixelformat	= icd->current_fmt->fourcc;
	f->fmt.pix.bytesperline	=
		(f->fmt.pix.width * icd->current_fmt->depth) >> 3;
	f->fmt.pix.sizeimage	=
		f->fmt.pix.height * f->fmt.pix.bytesperline;
	dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
		icd->current_fmt->fourcc);
	return 0;
}

static int soc_camera_querycap(struct file *file, void  *priv,
			       struct v4l2_capability *cap)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;
	struct soc_camera_host *ici =
		to_soc_camera_host(icd->dev.parent);

	WARN_ON(priv != file->private_data);

	strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
	return ici->ops->querycap(ici, cap);
}

static int soc_camera_streamon(struct file *file, void *priv,
			       enum v4l2_buf_type i)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;

	WARN_ON(priv != file->private_data);

	dev_dbg(&icd->dev, "%s\n", __func__);

	if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;

	icd->ops->start_capture(icd);

	/* This calls buf_queue from host driver's videobuf_queue_ops */
	return videobuf_streamon(&icf->vb_vidq);
}

static int soc_camera_streamoff(struct file *file, void *priv,
				enum v4l2_buf_type i)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;

	WARN_ON(priv != file->private_data);

	dev_dbg(&icd->dev, "%s\n", __func__);

	if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;

	/* This calls buf_release from host driver's videobuf_queue_ops for all
	 * remaining buffers. When the last buffer is freed, stop capture */
	videobuf_streamoff(&icf->vb_vidq);

	icd->ops->stop_capture(icd);

	return 0;
}

static int soc_camera_queryctrl(struct file *file, void *priv,
				struct v4l2_queryctrl *qc)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;
	int i;

	WARN_ON(priv != file->private_data);

	if (!qc->id)
		return -EINVAL;

	for (i = 0; i < icd->ops->num_controls; i++)
		if (qc->id == icd->ops->controls[i].id) {
			memcpy(qc, &(icd->ops->controls[i]),
				sizeof(*qc));
			return 0;
		}

	return -EINVAL;
}

static int soc_camera_g_ctrl(struct file *file, void *priv,
			     struct v4l2_control *ctrl)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;

	WARN_ON(priv != file->private_data);

	switch (ctrl->id) {
	case V4L2_CID_GAIN:
		if (icd->gain == (unsigned short)~0)
			return -EINVAL;
		ctrl->value = icd->gain;
		return 0;