diff options
Diffstat (limited to 'drivers/media/video/soc_camera.c')
| -rw-r--r-- | drivers/media/video/soc_camera.c | 1031 |
1 files changed, 1031 insertions, 0 deletions
diff --git a/drivers/media/video/soc_camera.c b/drivers/media/video/soc_camera.c new file mode 100644 index 000000000000..a1b92446c8b4 --- /dev/null +++ b/drivers/media/video/soc_camera.c @@ -0,0 +1,1031 @@ +/* + * 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", __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; + 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", __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; + 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", __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; + 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"); |