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V4L/DVB (7170): soc_camera V4L2 driver for directly-connected SoC-based cameras

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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.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Guennadi Liakhovetski 2008-04-22 14:42:03 -03:00 committed by Mauro Carvalho Chehab
parent a7c7402f68
commit e55222ef27
4 changed files with 1131 additions and 0 deletions
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9
drivers/media/video/Kconfig
View file

@ -836,4 +836,13 @@ config USB_STKWEBCAM
endif # V4L_USB_DRIVERS
config SOC_CAMERA
tristate "SoC camera support"
depends on VIDEO_V4L2
select VIDEOBUF_DMA_SG
help
SoC Camera is a common API to several cameras, not connecting
over a bus like PCI or USB. For example some i2c camera connected
directly to the data bus of an SoC.
endif # VIDEO_CAPTURE_DRIVERS

2
drivers/media/video/Makefile
View file

@ -136,5 +136,7 @@ obj-$(CONFIG_VIDEO_IVTV) += ivtv/
obj-$(CONFIG_VIDEO_VIVI) += vivi.o
obj-$(CONFIG_VIDEO_CX23885) += cx23885/
obj-$(CONFIG_SOC_CAMERA) += soc_camera.o
EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core
EXTRA_CFLAGS += -Idrivers/media/dvb/frontends

973
drivers/media/video/soc_camera.c Normal file
View file

@ -0,0 +1,973 @@
/*
* 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->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_pci_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 <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->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 <kernel@pengutronix.de>");
MODULE_LICENSE("GPL");

147
include/media/soc_camera.h Normal file
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@ -0,0 +1,147 @@
/*
* camera image capture (abstract) bus driver header
*
* Copyright (C) 2006, Sascha Hauer, Pengutronix
* Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
*
* 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.
*/
#ifndef SOC_CAMERA_H
#define SOC_CAMERA_H
#include <linux/videodev2.h>
#include <media/videobuf-dma-sg.h>
struct soc_camera_device {
struct list_head list;
struct device dev;
struct device *control;
unsigned short width; /* Current window */
unsigned short height; /* sizes */
unsigned short x_min; /* Camera capabilities */
unsigned short y_min;
unsigned short x_current; /* Current window location */
unsigned short y_current;
unsigned short width_min;
unsigned short width_max;
unsigned short height_min;
unsigned short height_max;
unsigned short y_skip_top; /* Lines to skip at the top */
unsigned short gain;
unsigned short exposure;
unsigned char iface; /* Host number */
unsigned char devnum; /* Device number per host */
unsigned char cached_datawidth; /* See comment in .c */
struct soc_camera_ops *ops;
struct video_device *vdev;
const struct soc_camera_data_format *current_fmt;
int (*probe)(struct soc_camera_device *icd);
void (*remove)(struct soc_camera_device *icd);
struct module *owner;
};
struct soc_camera_file {
struct soc_camera_device *icd;
struct videobuf_queue vb_vidq;
};
struct soc_camera_host {
struct list_head list;
struct device dev;
unsigned char nr; /* Host number */
size_t msize;
struct videobuf_queue_ops *vbq_ops;
struct module *owner;
void *priv;
char *drv_name;
int (*add)(struct soc_camera_device *);
void (*remove)(struct soc_camera_device *);
int (*set_capture_format)(struct soc_camera_device *, __u32,
struct v4l2_rect *);
int (*try_fmt_cap)(struct soc_camera_host *, struct v4l2_format *);
int (*reqbufs)(struct soc_camera_file *, struct v4l2_requestbuffers *);
int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
unsigned int (*poll)(struct file *, poll_table *);
};
struct soc_camera_link {
/* Camera bus id, used to match a camera and a bus */
int bus_id;
/* GPIO number to switch between 8 and 10 bit modes */
unsigned int gpio;
};
static inline struct soc_camera_device *to_soc_camera_dev(struct device *dev)
{
return container_of(dev, struct soc_camera_device, dev);
}
static inline struct soc_camera_host *to_soc_camera_host(struct device *dev)
{
return container_of(dev, struct soc_camera_host, dev);
}
extern int soc_camera_host_register(struct soc_camera_host *ici,
struct module *owner);
extern void soc_camera_host_unregister(struct soc_camera_host *ici);
extern int soc_camera_device_register(struct soc_camera_device *icd);
extern void soc_camera_device_unregister(struct soc_camera_device *icd);
extern int soc_camera_video_start(struct soc_camera_device *icd);
extern void soc_camera_video_stop(struct soc_camera_device *icd);
struct soc_camera_data_format {
char *name;
unsigned int depth;
__u32 fourcc;
enum v4l2_colorspace colorspace;
};
struct soc_camera_ops {
struct module *owner;
int (*init)(struct soc_camera_device *);
int (*release)(struct soc_camera_device *);
int (*start_capture)(struct soc_camera_device *);
int (*stop_capture)(struct soc_camera_device *);
int (*set_capture_format)(struct soc_camera_device *, __u32,
struct v4l2_rect *, unsigned int);
int (*try_fmt_cap)(struct soc_camera_device *, struct v4l2_format *);
int (*get_chip_id)(struct soc_camera_device *,
struct v4l2_chip_ident *);
#ifdef CONFIG_VIDEO_ADV_DEBUG
int (*get_register)(struct soc_camera_device *, struct v4l2_register *);
int (*set_register)(struct soc_camera_device *, struct v4l2_register *);
#endif
const struct soc_camera_data_format *formats;
int num_formats;
int (*get_control)(struct soc_camera_device *, struct v4l2_control *);
int (*set_control)(struct soc_camera_device *, struct v4l2_control *);
const struct v4l2_queryctrl *controls;
int num_controls;
unsigned int(*get_datawidth)(struct soc_camera_device *icd);
};
static inline struct v4l2_queryctrl const *soc_camera_find_qctrl(
struct soc_camera_ops *ops, int id)
{
int i;
for (i = 0; i < ops->num_controls; i++)
if (ops->controls[i].id == id)
return &ops->controls[i];
return NULL;
}
#define IS_MASTER (1<<0)
#define IS_HSYNC_ACTIVE_HIGH (1<<1)
#define IS_VSYNC_ACTIVE_HIGH (1<<2)
#define IS_DATAWIDTH_8 (1<<3)
#define IS_DATAWIDTH_9 (1<<4)
#define IS_DATAWIDTH_10 (1<<5)
#define IS_PCLK_SAMPLE_RISING (1<<6)
#endif