| /* |
| * camera image capture (abstract) bus driver |
| * |
| * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de> |
| * |
| * 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-dev.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_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", __FUNCTION__, p->memory); |
| |
| ret = videobuf_reqbufs(&icf->vb_vidq, p); |
| if (ret < 0) |
| return ret; |
| |
| return ici->ops->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; |
| struct soc_camera_device *icd; |
| struct soc_camera_host *ici; |
| struct soc_camera_file *icf; |
| spinlock_t *lock; |
| 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->dev, 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; |
| |
| icf->lock = ici->ops->spinlock_alloc(icf); |
| if (!icf->lock) { |
| ret = -ENOMEM; |
| goto esla; |
| } |
| |
| 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"); |
| |
| /* We must pass NULL as dev pointer, then all pci_* dma operations |
| * transform to normal dma_* ones. */ |
| videobuf_queue_sg_init(&icf->vb_vidq, ici->vbq_ops, NULL, icf->lock, |
| V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE, |
| ici->msize, icd); |
| |
| return 0; |
| |
| /* All errors are entered with the video_lock held */ |
| eiciadd: |
| lock = icf->lock; |
| icf->lock = NULL; |
| if (ici->ops->spinlock_free) |
| ici->ops->spinlock_free(lock); |
| esla: |
| 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; |
| spinlock_t *lock = icf->lock; |
| |
| mutex_lock(&video_lock); |
| icd->use_count--; |
| if (!icd->use_count) |
| ici->ops->remove(icd); |
| icf->lock = NULL; |
| if (ici->ops->spinlock_free) |
| ici->ops->spinlock_free(lock); |
| module_put(icd->ops->owner); |
| module_put(ici->ops->owner); |
| mutex_unlock(&video_lock); |
| |
| vfree(icf); |
| |
| dev_dbg(vdev->dev, "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->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->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_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_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_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_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", __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->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 <hidave.darkstar@gmail.com> */ |
| 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 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) |
| { |
| } |
| |
| static spinlock_t *spinlock_alloc(struct soc_camera_file *icf) |
| { |
| spinlock_t *lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL); |
| |
| if (lock) |
| spin_lock_init(lock); |
| |
| return lock; |
| } |
| |
| static void spinlock_free(spinlock_t *lock) |
| { |
| kfree(lock); |
| } |
| |
| int soc_camera_host_register(struct soc_camera_host *ici) |
| { |
| int ret; |
| struct soc_camera_host *ix; |
| |
| if (!ici->vbq_ops || !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); |
| 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->dev.release = dummy_release; |
| |
| ret = device_register(&ici->dev); |
| |
| if (ret) |
| goto edevr; |
| |
| if (!ici->ops->spinlock_alloc) { |
| ici->ops->spinlock_alloc = spinlock_alloc; |
| ici->ops->spinlock_free = spinlock_free; |
| } |
| |
| 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); |
| |
| 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->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 <kernel@pengutronix.de>"); |
| MODULE_LICENSE("GPL"); |