/* * camera image capture (abstract) bus driver * * Copyright (C) 2008, Guennadi Liakhovetski * * 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 #include #include #include #include #include #include #include #include #include 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->ops->num_formats; i++) if (icd->ops->formats[i].fourcc == fourcc) return icd->ops->formats + i; return NULL; } static int soc_camera_try_fmt_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; } /* limit to host capabilities */ ret = ici->try_fmt_cap(ici, f); /* limit to sensor capabilities */ if (!ret) ret = icd->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", __FUNCTION__, p->memory); ret = videobuf_reqbufs(&icf->vb_vidq, p); if (ret < 0) return ret; return ici->reqbufs(icf, p); return ret; } 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 = video_devdata(file); struct soc_camera_device *icd = container_of(vdev->dev, struct soc_camera_device, dev); struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); struct soc_camera_file *icf; int ret; icf = vmalloc(sizeof(*icf)); if (!icf) return -ENOMEM; icf->icd = icd; 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->owner)) { dev_err(&icd->dev, "Couldn't lock capture bus driver.\n"); ret = -EINVAL; goto emgi; } file->private_data = icf; dev_dbg(&icd->dev, "camera device open\n"); /* We must pass NULL as dev pointer, then all pci_* dma operations * transform to normal dma_* ones. Do we need an irqlock? */ videobuf_queue_sg_init(&icf->vb_vidq, ici->vbq_ops, NULL, NULL, V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE, ici->msize, icd); return 0; emgi: module_put(icd->ops->owner); emgd: 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; module_put(icd->ops->owner); module_put(ici->owner); vfree(file->private_data); dev_dbg(vdev->dev, "camera device close\n"); return 0; } static int 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->dev, "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->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_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; /* cached_datawidth may be further adjusted by the ici */ icd->cached_datawidth = data_fmt->depth; ret = soc_camera_try_fmt_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->set_capture_format(icd, f->fmt.pix.pixelformat, &rect); if (!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); } return ret; } static int soc_camera_enum_fmt_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->ops->num_formats) return -EINVAL; format = &icd->ops->formats[f->index]; strlcpy(f->description, format->name, sizeof(f->description)); f->pixelformat = format->fourcc; return 0; } static int soc_camera_g_fmt_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->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", __FUNCTION__); 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", __FUNCTION__); 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; 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->set_capture_format(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 */ 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->probe) return -ENODEV; ret = ici->add(icd); if (ret < 0) return ret; ret = icd->probe(icd); if (ret < 0) ici->remove(icd); else { 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; } 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); struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); if (icd->remove) icd->remove(icd); ici->remove(icd); return 0; } static struct bus_type soc_camera_bus_type = { .name = "soc-camera", .probe = soc_camera_probe, .remove = soc_camera_remove, }; static struct device_driver ic_drv = { .name = "camera", .bus = &soc_camera_bus_type, .owner = THIS_MODULE, }; /* * Image capture host - this is a host device, not a bus device, so, * no bus reference, no probing. */ static struct class soc_camera_host_class = { .owner = THIS_MODULE, .name = "camera_host", }; static void dummy_release(struct device *dev) { } int soc_camera_host_register(struct soc_camera_host *ici, struct module *owner) { int ret; struct soc_camera_host *ix; if (!ici->vbq_ops || !ici->add || !ici->remove || !owner) return -EINVAL; /* Number might be equal to the platform device ID */ sprintf(ici->dev.bus_id, "camera_host%d", ici->nr); ici->dev.class = &soc_camera_host_class; 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->owner = owner; 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->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; if (icd->ops->get_datawidth) icd->cached_datawidth = icd->ops->get_datawidth(icd); 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); 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->dev = &icd->dev; vdev->type = VID_TYPE_CAPTURE; vdev->current_norm = V4L2_STD_UNKNOWN; vdev->fops = &soc_camera_fops; vdev->release = video_device_release; vdev->minor = -1; vdev->tvnorms = V4L2_STD_UNKNOWN, vdev->vidioc_querycap = soc_camera_querycap; vdev->vidioc_g_fmt_cap = soc_camera_g_fmt_cap; vdev->vidioc_enum_fmt_cap = soc_camera_enum_fmt_cap; vdev->vidioc_s_fmt_cap = soc_camera_s_fmt_cap; vdev->vidioc_enum_input = soc_camera_enum_input; vdev->vidioc_g_input = soc_camera_g_input; vdev->vidioc_s_input = soc_camera_s_input; vdev->vidioc_s_std = soc_camera_s_std; vdev->vidioc_reqbufs = soc_camera_reqbufs; vdev->vidioc_try_fmt_cap = soc_camera_try_fmt_cap; vdev->vidioc_querybuf = soc_camera_querybuf; vdev->vidioc_qbuf = soc_camera_qbuf; vdev->vidioc_dqbuf = soc_camera_dqbuf; vdev->vidioc_streamon = soc_camera_streamon; vdev->vidioc_streamoff = soc_camera_streamoff; vdev->vidioc_queryctrl = soc_camera_queryctrl; vdev->vidioc_g_ctrl = soc_camera_g_ctrl; vdev->vidioc_s_ctrl = soc_camera_s_ctrl; vdev->vidioc_cropcap = soc_camera_cropcap; vdev->vidioc_g_crop = soc_camera_g_crop; vdev->vidioc_s_crop = soc_camera_s_crop; vdev->vidioc_g_chip_ident = soc_camera_g_chip_ident; #ifdef CONFIG_VIDEO_ADV_DEBUG vdev->vidioc_g_register = soc_camera_g_register; vdev->vidioc_s_register = soc_camera_s_register; #endif icd->current_fmt = &icd->ops->formats[0]; err = video_register_device(vdev, VFL_TYPE_GRABBER, vdev->minor); if (err < 0) { dev_err(vdev->dev, "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", __FUNCTION__); 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; ret = class_register(&soc_camera_host_class); if (ret) goto eclr; return 0; eclr: driver_unregister(&ic_drv); edrvr: bus_unregister(&soc_camera_bus_type); return ret; } static void __exit soc_camera_exit(void) { class_unregister(&soc_camera_host_class); 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 "); MODULE_LICENSE("GPL");