soc_camera.c

trident tm5600的linux驱动

	case V4L2_CID_EXPOSURE:
		if (icd->exposure == (unsigned short)~0)
			return -EINVAL;
		ctrl->value = icd->exposure;
		return 0;
	}

	if (icd->ops->get_control)
		return icd->ops->get_control(icd, ctrl);
	return -EINVAL;
}

static int soc_camera_s_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);

	if (icd->ops->set_control)
		return icd->ops->set_control(icd, ctrl);
	return -EINVAL;
}

static int soc_camera_cropcap(struct file *file, void *fh,
			      struct v4l2_cropcap *a)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;

	a->type				= V4L2_BUF_TYPE_VIDEO_CAPTURE;
	a->bounds.left			= icd->x_min;
	a->bounds.top			= icd->y_min;
	a->bounds.width			= icd->width_max;
	a->bounds.height		= icd->height_max;
	a->defrect.left			= icd->x_min;
	a->defrect.top			= icd->y_min;
	a->defrect.width		= 640;
	a->defrect.height		= 480;
	a->pixelaspect.numerator	= 1;
	a->pixelaspect.denominator	= 1;

	return 0;
}

static int soc_camera_g_crop(struct file *file, void *fh,
			     struct v4l2_crop *a)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;

	a->type		= V4L2_BUF_TYPE_VIDEO_CAPTURE;
	a->c.left	= icd->x_current;
	a->c.top	= icd->y_current;
	a->c.width	= icd->width;
	a->c.height	= icd->height;

	return 0;
}

static int soc_camera_s_crop(struct file *file, void *fh,
			     struct v4l2_crop *a)
{
	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;

	if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;

	ret = ici->ops->set_fmt_cap(icd, 0, &a->c);
	if (!ret) {
		icd->width	= a->c.width;
		icd->height	= a->c.height;
		icd->x_current	= a->c.left;
		icd->y_current	= a->c.top;
	}

	return ret;
}

static int soc_camera_g_chip_ident(struct file *file, void *fh,
				   struct v4l2_chip_ident *id)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;

	if (!icd->ops->get_chip_id)
		return -EINVAL;

	return icd->ops->get_chip_id(icd, id);
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int soc_camera_g_register(struct file *file, void *fh,
				 struct v4l2_register *reg)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;

	if (!icd->ops->get_register)
		return -EINVAL;

	return icd->ops->get_register(icd, reg);
}

static int soc_camera_s_register(struct file *file, void *fh,
				 struct v4l2_register *reg)
{
	struct soc_camera_file *icf = file->private_data;
	struct soc_camera_device *icd = icf->icd;

	if (!icd->ops->set_register)
		return -EINVAL;

	return icd->ops->set_register(icd, reg);
}
#endif

static int device_register_link(struct soc_camera_device *icd)
{
	int ret = device_register(&icd->dev);

	if (ret < 0) {
		/* Prevent calling device_unregister() */
		icd->dev.parent = NULL;
		dev_err(&icd->dev, "Cannot register device: %d\n", ret);
	/* Even if probe() was unsuccessful for all registered drivers,
	 * device_register() returns 0, and we add the link, just to
	 * document this camera's control device */
	} else if (icd->control)
		/* Have to sysfs_remove_link() before device_unregister()? */
		if (sysfs_create_link(&icd->dev.kobj, &icd->control->kobj,
				      "control"))
			dev_warn(&icd->dev,
				 "Failed creating the control symlink\n");
	return ret;
}

/* So far this function cannot fail */
static void scan_add_host(struct soc_camera_host *ici)
{
	struct soc_camera_device *icd;

	mutex_lock(&list_lock);

	list_for_each_entry(icd, &devices, list) {
		if (icd->iface == ici->nr) {
			icd->dev.parent = &ici->dev;
			device_register_link(icd);
		}
	}

	mutex_unlock(&list_lock);
}

/* return: 0 if no match found or a match found and
 * device_register() successful, error code otherwise */
static int scan_add_device(struct soc_camera_device *icd)
{
	struct soc_camera_host *ici;
	int ret = 0;

	mutex_lock(&list_lock);

	list_add_tail(&icd->list, &devices);

	/* Watch out for class_for_each_device / class_find_device API by
	 * Dave Young <[e-mail]> */
	list_for_each_entry(ici, &hosts, list) {
		if (icd->iface == ici->nr) {
			ret = 1;
			icd->dev.parent = &ici->dev;
			break;
		}
	}

	mutex_unlock(&list_lock);

	if (ret)
		ret = device_register_link(icd);

	return ret;
}

static int soc_camera_probe(struct device *dev)
{
	struct soc_camera_device *icd = to_soc_camera_dev(dev);
	struct soc_camera_host *ici =
		to_soc_camera_host(icd->dev.parent);
	int ret;

	if (!icd->ops->probe)
		return -ENODEV;

	/* We only call ->add() here to activate and probe the camera.
	 * We shall ->remove() and deactivate it immediately afterwards. */
	ret = ici->ops->add(icd);
	if (ret < 0)
		return ret;

	ret = icd->ops->probe(icd);
	if (ret >= 0) {
		const struct v4l2_queryctrl *qctrl;

		qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_GAIN);
		icd->gain = qctrl ? qctrl->default_value : (unsigned short)~0;
		qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
		icd->exposure = qctrl ? qctrl->default_value :
			(unsigned short)~0;
	}
	ici->ops->remove(icd);

	return ret;
}

/* This is called on device_unregister, which only means we have to disconnect
 * from the host, but not remove ourselves from the device list */
static int soc_camera_remove(struct device *dev)
{
	struct soc_camera_device *icd = to_soc_camera_dev(dev);

	if (icd->ops->remove)
		icd->ops->remove(icd);

	return 0;
}

static int soc_camera_suspend(struct device *dev, pm_message_t state)
{
	struct soc_camera_device *icd = to_soc_camera_dev(dev);
	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
	int ret = 0;

	if (ici->ops->suspend)
		ret = ici->ops->suspend(icd, state);

	return ret;
}

static int soc_camera_resume(struct device *dev)
{
	struct soc_camera_device *icd = to_soc_camera_dev(dev);
	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
	int ret = 0;

	if (ici->ops->resume)
		ret = ici->ops->resume(icd);

	return ret;
}

static struct bus_type soc_camera_bus_type = {
	.name		= "soc-camera",
	.probe		= soc_camera_probe,
	.remove		= soc_camera_remove,
	.suspend	= soc_camera_suspend,
	.resume		= soc_camera_resume,
};

static struct device_driver ic_drv = {
	.name	= "camera",
	.bus	= &soc_camera_bus_type,
	.owner	= THIS_MODULE,
};

static void dummy_release(struct device *dev)
{
}

int soc_camera_host_register(struct soc_camera_host *ici)
{
	int ret;
	struct soc_camera_host *ix;

	if (!ici->ops->init_videobuf || !ici->ops->add || !ici->ops->remove)
		return -EINVAL;

	/* Number might be equal to the platform device ID */
	sprintf(ici->dev.bus_id, "camera_host%d", ici->nr);

	mutex_lock(&list_lock);
	list_for_each_entry(ix, &hosts, list) {
		if (ix->nr == ici->nr) {
			mutex_unlock(&list_lock);
			return -EBUSY;
		}
	}

	list_add_tail(&ici->list, &hosts);
	mutex_unlock(&list_lock);

	ici->dev.release = dummy_release;

	ret = device_register(&ici->dev);

	if (ret)
		goto edevr;

	scan_add_host(ici);

	return 0;

edevr:
	mutex_lock(&list_lock);
	list_del(&ici->list);
	mutex_unlock(&list_lock);

	return ret;
}
EXPORT_SYMBOL(soc_camera_host_register);

/* Unregister all clients! */
void soc_camera_host_unregister(struct soc_camera_host *ici)
{
	struct soc_camera_device *icd;

	mutex_lock(&list_lock);

	list_del(&ici->list);

	list_for_each_entry(icd, &devices, list) {
		if (icd->dev.parent == &ici->dev) {
			device_unregister(&icd->dev);
			/* Not before device_unregister(), .remove
			 * needs parent to call ici->ops->remove() */
			icd->dev.parent = NULL;
			memset(&icd->dev.kobj, 0, sizeof(icd->dev.kobj));
		}
	}

	mutex_unlock(&list_lock);

	device_unregister(&ici->dev);
}
EXPORT_SYMBOL(soc_camera_host_unregister);

/* Image capture device */
int soc_camera_device_register(struct soc_camera_device *icd)
{
	struct soc_camera_device *ix;
	int num = -1, i;

	if (!icd)
		return -EINVAL;

	for (i = 0; i < 256 && num < 0; i++) {
		num = i;
		list_for_each_entry(ix, &devices, list) {
			if (ix->iface == icd->iface && ix->devnum == i) {
				num = -1;
				break;
			}
		}
	}

	if (num < 0)
		/* ok, we have 256 cameras on this host...
		 * man, stay reasonable... */
		return -ENOMEM;

	icd->devnum = num;
	icd->dev.bus = &soc_camera_bus_type;
	snprintf(icd->dev.bus_id, sizeof(icd->dev.bus_id),
		 "%u-%u", icd->iface, icd->devnum);

	icd->dev.release = dummy_release;

	return scan_add_device(icd);
}
EXPORT_SYMBOL(soc_camera_device_register);

void soc_camera_device_unregister(struct soc_camera_device *icd)
{
	mutex_lock(&list_lock);
	list_del(&icd->list);

	/* The bus->remove will be eventually called */
	if (icd->dev.parent)
		device_unregister(&icd->dev);
	mutex_unlock(&list_lock);
}
EXPORT_SYMBOL(soc_camera_device_unregister);

static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
	.vidioc_querycap	 = soc_camera_querycap,
	.vidioc_g_fmt_vid_cap    = soc_camera_g_fmt_vid_cap,
	.vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
	.vidioc_s_fmt_vid_cap    = soc_camera_s_fmt_vid_cap,
	.vidioc_enum_input	 = soc_camera_enum_input,
	.vidioc_g_input		 = soc_camera_g_input,
	.vidioc_s_input		 = soc_camera_s_input,
	.vidioc_s_std		 = soc_camera_s_std,
	.vidioc_reqbufs		 = soc_camera_reqbufs,
	.vidioc_try_fmt_vid_cap  = soc_camera_try_fmt_vid_cap,
	.vidioc_querybuf	 = soc_camera_querybuf,
	.vidioc_qbuf		 = soc_camera_qbuf,
	.vidioc_dqbuf		 = soc_camera_dqbuf,
	.vidioc_streamon	 = soc_camera_streamon,
	.vidioc_streamoff	 = soc_camera_streamoff,
	.vidioc_queryctrl	 = soc_camera_queryctrl,
	.vidioc_g_ctrl		 = soc_camera_g_ctrl,
	.vidioc_s_ctrl		 = soc_camera_s_ctrl,
	.vidioc_cropcap		 = soc_camera_cropcap,
	.vidioc_g_crop		 = soc_camera_g_crop,
	.vidioc_s_crop		 = soc_camera_s_crop,
	.vidioc_g_chip_ident     = soc_camera_g_chip_ident,
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.vidioc_g_register	 = soc_camera_g_register,
	.vidioc_s_register	 = soc_camera_s_register,
#endif
};

int soc_camera_video_start(struct soc_camera_device *icd)
{
	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
	int err = -ENOMEM;
	struct video_device *vdev;

	if (!icd->dev.parent)
		return -ENODEV;

	vdev = video_device_alloc();
	if (!vdev)
		goto evidallocd;
	dev_dbg(&ici->dev, "Allocated video_device %p\n", vdev);

	strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
	/* Maybe better &ici->dev */
	vdev->parent		= &icd->dev;
	vdev->current_norm	= V4L2_STD_UNKNOWN;
	vdev->fops		= &soc_camera_fops;
	vdev->ioctl_ops		= &soc_camera_ioctl_ops;
	vdev->release		= video_device_release;
	vdev->minor		= -1;
	vdev->tvnorms		= V4L2_STD_UNKNOWN,

	icd->current_fmt = &icd->formats[0];

	err = video_register_device(vdev, VFL_TYPE_GRABBER, vdev->minor);
	if (err < 0) {
		dev_err(vdev->parent, "video_register_device failed\n");
		goto evidregd;
	}
	icd->vdev = vdev;

	return 0;

evidregd:
	video_device_release(vdev);
evidallocd:
	return err;
}
EXPORT_SYMBOL(soc_camera_video_start);

void soc_camera_video_stop(struct soc_camera_device *icd)
{
	struct video_device *vdev = icd->vdev;

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

	if (!icd->dev.parent || !vdev)
		return;

	mutex_lock(&video_lock);
	video_unregister_device(vdev);
	icd->vdev = NULL;
	mutex_unlock(&video_lock);
}
EXPORT_SYMBOL(soc_camera_video_stop);

static int __init soc_camera_init(void)
{
	int ret = bus_register(&soc_camera_bus_type);
	if (ret)
		return ret;
	ret = driver_register(&ic_drv);
	if (ret)
		goto edrvr;

	return 0;

edrvr:
	bus_unregister(&soc_camera_bus_type);
	return ret;
}

static void __exit soc_camera_exit(void)
{
	driver_unregister(&ic_drv);
	bus_unregister(&soc_camera_bus_type);
}

module_init(soc_camera_init);
module_exit(soc_camera_exit);

MODULE_DESCRIPTION("Image capture bus driver");
MODULE_AUTHOR("Guennadi Liakhovetski <[e-mail]>");
MODULE_LICENSE("GPL");