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|
/*
* 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-ioctl.h>
#include <media/v4l2-dev.h>
#include <media/videobuf-core.h>
#include <media/soc_camera.h>
/* Default to VGA resolution */
#define DEFAULT_WIDTH 640
#define DEFAULT_HEIGHT 480
static LIST_HEAD(hosts);
static LIST_HEAD(devices);
static DEFINE_MUTEX(list_lock);
const struct soc_camera_data_format *soc_camera_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;
}
EXPORT_SYMBOL(soc_camera_format_by_fourcc);
const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
struct soc_camera_device *icd, unsigned int fourcc)
{
unsigned int i;
for (i = 0; i < icd->num_user_formats; i++)
if (icd->user_formats[i].host_fmt->fourcc == fourcc)
return icd->user_formats + i;
return NULL;
}
EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
/**
* soc_camera_apply_sensor_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
* @icl: camera platform parameters
* @flags: flags to be inverted according to platform configuration
* @return: resulting flags
*/
unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
unsigned long flags)
{
unsigned long f;
/* If only one of the two polarities is supported, switch to the opposite */
if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) {
f = flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
if (f == SOCAM_HSYNC_ACTIVE_HIGH || f == SOCAM_HSYNC_ACTIVE_LOW)
flags ^= SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW;
}
if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) {
f = flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
if (f == SOCAM_VSYNC_ACTIVE_HIGH || f == SOCAM_VSYNC_ACTIVE_LOW)
flags ^= SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW;
}
if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) {
f = flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
if (f == SOCAM_PCLK_SAMPLE_RISING || f == SOCAM_PCLK_SAMPLE_FALLING)
flags ^= SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING;
}
return flags;
}
EXPORT_SYMBOL(soc_camera_apply_sensor_flags);
static int soc_camera_try_fmt_vid_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);
WARN_ON(priv != file->private_data);
/* limit format to hardware capabilities */
return ici->ops->try_fmt(icd, f);
}
static int soc_camera_enum_input(struct file *file, void *priv,
struct v4l2_input *inp)
{
struct soc_camera_file *icf = file->private_data;
struct soc_camera_device *icd = icf->icd;
int ret = 0;
if (inp->index != 0)
return -EINVAL;
if (icd->ops->enum_input)
ret = icd->ops->enum_input(icd, inp);
else {
/* default is camera */
inp->type = V4L2_INPUT_TYPE_CAMERA;
inp->std = V4L2_STD_UNKNOWN;
strcpy(inp->name, "Camera");
}
return ret;
}
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)
{
struct soc_camera_file *icf = file->private_data;
struct soc_camera_device *icd = icf->icd;
int ret = 0;
if (icd->ops->set_std)
ret = icd->ops->set_std(icd, a);
return ret;
}
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_init_user_formats(struct soc_camera_device *icd)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
int i, fmts = 0;
if (!ici->ops->get_formats)
/*
* Fallback mode - the host will have to serve all
* sensor-provided formats one-to-one to the user
*/
fmts = icd->num_formats;
else
/*
* First pass - only count formats this host-sensor
* configuration can provide
*/
for (i = 0; i < icd->num_formats; i++)
fmts += ici->ops->get_formats(icd, i, NULL);
if (!fmts)
return -ENXIO;
icd->user_formats =
vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
if (!icd->user_formats)
return -ENOMEM;
icd->num_user_formats = fmts;
fmts = 0;
dev_dbg(&icd->dev, "Found %d supported formats.\n", fmts);
/* Second pass - actually fill data formats */
for (i = 0; i < icd->num_formats; i++)
if (!ici->ops->get_formats) {
icd->user_formats[i].host_fmt = icd->formats + i;
icd->user_formats[i].cam_fmt = icd->formats + i;
icd->user_formats[i].buswidth = icd->formats[i].depth;
} else {
fmts += ici->ops->get_formats(icd, i,
&icd->user_formats[fmts]);
}
icd->current_fmt = icd->user_formats[0].host_fmt;
return 0;
}
static void soc_camera_free_user_formats(struct soc_camera_device *icd)
{
vfree(icd->user_formats);
}
/* Called with .vb_lock held */
static int soc_camera_set_fmt(struct soc_camera_file *icf,
struct v4l2_format *f)
{
struct soc_camera_device *icd = icf->icd;
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct v4l2_pix_format *pix = &f->fmt.pix;
int ret;
/* We always call try_fmt() before set_fmt() or set_crop() */
ret = ici->ops->try_fmt(icd, f);
if (ret < 0)
return ret;
ret = ici->ops->set_fmt(icd, f);
if (ret < 0) {
return ret;
} else if (!icd->current_fmt ||
icd->current_fmt->fourcc != pix->pixelformat) {
dev_err(ici->dev,
"Host driver hasn't set up current format correctly!\n");
return -EINVAL;
}
icd->width = pix->width;
icd->height = pix->height;
icf->vb_vidq.field =
icd->field = pix->field;
if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
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, pix->pixelformat);
}
static int soc_camera_open(struct file *file)
{
struct video_device *vdev;
struct soc_camera_device *icd;
struct soc_camera_host *ici;
struct soc_camera_file *icf;
int ret;
icf = vmalloc(sizeof(*icf));
if (!icf)
return -ENOMEM;
/*
* It is safe to dereference these pointers now as long as a user has
* the video device open - we are protected by the held cdev reference.
*/
vdev = video_devdata(file);
icd = container_of(vdev->parent, 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;
}
/* Protect against icd->remove() until we module_get() both drivers. */
mutex_lock(&icd->video_lock);
icf->icd = icd;
icd->use_count++;
/* Now we really have to activate the camera */
if (icd->use_count == 1) {
/* Restore parameters before the last close() per V4L2 API */
struct v4l2_format f = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.fmt.pix = {
.width = icd->width,
.height = icd->height,
.field = icd->field,
.pixelformat = icd->current_fmt->fourcc,
.colorspace = icd->current_fmt->colorspace,
},
};
ret = ici->ops->add(icd);
if (ret < 0) {
dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
goto eiciadd;
}
/* Try to configure with default parameters */
ret = soc_camera_set_fmt(icf, &f);
if (ret < 0)
goto esfmt;
}
mutex_unlock(&icd->video_lock);
file->private_data = icf;
dev_dbg(&icd->dev, "camera device open\n");
ici->ops->init_videobuf(&icf->vb_vidq, icd);
return 0;
/*
* First three errors are entered with the .video_lock held
* and use_count == 1
*/
esfmt:
ici->ops->remove(icd);
eiciadd:
icd->use_count--;
mutex_unlock(&icd->video_lock);
module_put(ici->ops->owner);
emgi:
module_put(icd->ops->owner);
emgd:
vfree(icf);
return ret;
}
static int soc_camera_close(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;
mutex_lock(&icd->video_lock);
icd->use_count--;
if (!icd->use_count)
ici->ops->remove(icd);
mutex_unlock(&icd->video_lock);
module_put(icd->ops->owner);
module_put(ici->ops->owner);
vfree(icf);
dev_dbg(vdev->parent, "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->parent, "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 v4l2_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,
};
static int soc_camera_s_fmt_vid_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;
int ret;
WARN_ON(priv != file->private_data);
mutex_lock(&icf->vb_vidq.vb_lock);
if (videobuf_queue_is_busy(&icf->vb_vidq)) {
dev_err(&icd->dev, "S_FMT denied: queue busy\n");
ret = -EBUSY;
goto unlock;
}
ret = soc_camera_set_fmt(icf, f);
unlock:
mutex_unlock(&icf->vb_vidq.vb_lock);
return ret;
}
static int soc_camera_enum_fmt_vid_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_user_formats)
return -EINVAL;
format = icd->user_formats[f->index].host_fmt;
strlcpy(f->description, format->name, sizeof(f->description));
f->pixelformat = format->fourcc;
return 0;
}
static int soc_camera_g_fmt_vid_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 v4l2_pix_format *pix = &f->fmt.pix;
WARN_ON(priv != file->private_data);
pix->width = icd->width;
pix->height = icd->height;
pix->field = icf->vb_vidq.field;
pix->pixelformat = icd->current_fmt->fourcc;
pix->bytesperline = pix->width *
DIV_ROUND_UP(icd->current_fmt->depth, 8);
pix->sizeimage = pix->height * 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;
int ret;
WARN_ON(priv != file->private_data);
dev_dbg(&icd->dev, "%s\n", __func__);
if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
mutex_lock(&icd->video_lock);
icd->ops->start_capture(icd);
/* This calls buf_queue from host driver's videobuf_queue_ops */
ret = videobuf_streamon(&icf->vb_vidq);
mutex_unlock(&icd->video_lock);
return ret;
}
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;
mutex_lock(&icd->video_lock);
/* 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);
mutex_unlock(&icd->video_lock);
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 = DEFAULT_WIDTH;
a->defrect.height = DEFAULT_HEIGHT;
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;
/* Cropping is allowed during a running capture, guard consistency */
mutex_lock(&icf->vb_vidq.vb_lock);
ret = ici->ops->set_crop(icd, &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;
}
mutex_unlock(&icf->vb_vidq.vb_lock);
return ret;
}
static int soc_camera_g_chip_ident(struct file *file, void *fh,
struct v4l2_dbg_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_dbg_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_dbg_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 = dev_set_name(&icd->dev, "%u-%u", icd->iface, icd->devnum);
if (!ret)
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;
/*
* Possible race scenario:
* modprobe <camera-host-driver> triggers __func__
* at this moment respective <camera-sensor-driver> gets rmmod'ed
* to protect take module references.
*/
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;
}
mutex_lock(&icd->video_lock);
/* 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)
goto eiadd;
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;
ret = soc_camera_init_user_formats(icd);
if (ret < 0)
goto eiufmt;
icd->height = DEFAULT_HEIGHT;
icd->width = DEFAULT_WIDTH;
icd->field = V4L2_FIELD_ANY;
}
eiufmt:
ici->ops->remove(icd);
eiadd:
mutex_unlock(&icd->video_lock);
module_put(ici->ops->owner);
emgi:
module_put(icd->ops->owner);
emgd:
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);
soc_camera_free_user_formats(icd);
return 0;
}
static int soc_camera_suspend(struct device *dev, pm_message_t state)
{
struct soc_camera_device *icd = to_soc_camera_dev(dev);
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
int ret = 0;
if (ici->ops->suspend)
ret = ici->ops->suspend(icd, state);
return ret;
}
static int soc_camera_resume(struct device *dev)
{
struct soc_camera_device *icd = to_soc_camera_dev(dev);
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
int ret = 0;
if (ici->ops->resume)
ret = ici->ops->resume(icd);
return ret;
}
static struct bus_type soc_camera_bus_type = {
.name = "soc-camera",
.probe = soc_camera_probe,
.remove = soc_camera_remove,
.suspend = soc_camera_suspend,
.resume = soc_camera_resume,
};
static struct device_driver ic_drv = {
.name = "camera",
.bus = &soc_camera_bus_type,
.owner = THIS_MODULE,
};
static void dummy_release(struct device *dev)
{
}
int soc_camera_host_register(struct soc_camera_host *ici)
{
struct soc_camera_host *ix;
if (!ici || !ici->ops ||
!ici->ops->try_fmt ||
!ici->ops->set_fmt ||
!ici->ops->set_crop ||
!ici->ops->set_bus_param ||
!ici->ops->querycap ||
!ici->ops->init_videobuf ||
!ici->ops->reqbufs ||
!ici->ops->add ||
!ici->ops->remove ||
!ici->ops->poll ||
!ici->dev)
return -EINVAL;
mutex_lock(&list_lock);
list_for_each_entry(ix, &hosts, list) {
if (ix->nr == ici->nr) {
mutex_unlock(&list_lock);
return -EBUSY;
}
}
dev_set_drvdata(ici->dev, ici);
list_add_tail(&ici->list, &hosts);
mutex_unlock(&list_lock);
scan_add_host(ici);
return 0;
}
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);
dev_set_drvdata(ici->dev, NULL);
}
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 || !icd->ops ||
!icd->ops->probe ||
!icd->ops->init ||
!icd->ops->release ||
!icd->ops->start_capture ||
!icd->ops->stop_capture ||
!icd->ops->set_crop ||
!icd->ops->set_fmt ||
!icd->ops->try_fmt ||
!icd->ops->query_bus_param ||
!icd->ops->set_bus_param)
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;
icd->dev.release = dummy_release;
icd->use_count = 0;
icd->host_priv = NULL;
mutex_init(&icd->video_lock);
return scan_add_device(icd);
}
EXPORT_SYMBOL(soc_camera_device_register);
void soc_camera_device_unregister(struct soc_camera_device *icd)
{
mutex_lock(&list_lock);
list_del(&icd->list);
/* The bus->remove will be eventually called */
if (icd->dev.parent)
device_unregister(&icd->dev);
mutex_unlock(&list_lock);
}
EXPORT_SYMBOL(soc_camera_device_unregister);
static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
.vidioc_querycap = soc_camera_querycap,
.vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
.vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
.vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
.vidioc_enum_input = soc_camera_enum_input,
.vidioc_g_input = soc_camera_g_input,
.vidioc_s_input = soc_camera_s_input,
.vidioc_s_std = soc_camera_s_std,
.vidioc_reqbufs = soc_camera_reqbufs,
.vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
.vidioc_querybuf = soc_camera_querybuf,
.vidioc_qbuf = soc_camera_qbuf,
.vidioc_dqbuf = soc_camera_dqbuf,
.vidioc_streamon = soc_camera_streamon,
.vidioc_streamoff = soc_camera_streamoff,
.vidioc_queryctrl = soc_camera_queryctrl,
.vidioc_g_ctrl = soc_camera_g_ctrl,
.vidioc_s_ctrl = soc_camera_s_ctrl,
.vidioc_cropcap = soc_camera_cropcap,
.vidioc_g_crop = soc_camera_g_crop,
.vidioc_s_crop = soc_camera_s_crop,
.vidioc_g_chip_ident = soc_camera_g_chip_ident,
#ifdef CONFIG_VIDEO_ADV_DEBUG
.vidioc_g_register = soc_camera_g_register,
.vidioc_s_register = soc_camera_s_register,
#endif
};
/*
* Usually called from the struct soc_camera_ops .probe() method, i.e., from
* soc_camera_probe() above with .video_lock held
*/
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));
vdev->parent = &icd->dev;
vdev->current_norm = V4L2_STD_UNKNOWN;
vdev->fops = &soc_camera_fops;
vdev->ioctl_ops = &soc_camera_ioctl_ops;
vdev->release = video_device_release;
vdev->minor = -1;
vdev->tvnorms = V4L2_STD_UNKNOWN,
err = video_register_device(vdev, VFL_TYPE_GRABBER, vdev->minor);
if (err < 0) {
dev_err(vdev->parent, "video_register_device failed\n");
goto evidregd;
}
icd->vdev = vdev;
return 0;
evidregd:
video_device_release(vdev);
evidallocd:
return err;
}
EXPORT_SYMBOL(soc_camera_video_start);
void soc_camera_video_stop(struct soc_camera_device *icd)
{
struct video_device *vdev = icd->vdev;
dev_dbg(&icd->dev, "%s\n", __func__);
if (!icd->dev.parent || !vdev)
return;
mutex_lock(&icd->video_lock);
video_unregister_device(vdev);
icd->vdev = NULL;
mutex_unlock(&icd->video_lock);
}
EXPORT_SYMBOL(soc_camera_video_stop);
static int __init soc_camera_init(void)
{
int ret = bus_register(&soc_camera_bus_type);
if (ret)
return ret;
ret = driver_register(&ic_drv);
if (ret)
goto edrvr;
return 0;
edrvr:
bus_unregister(&soc_camera_bus_type);
return ret;
}
static void __exit soc_camera_exit(void)
{
driver_unregister(&ic_drv);
bus_unregister(&soc_camera_bus_type);
}
module_init(soc_camera_init);
module_exit(soc_camera_exit);
MODULE_DESCRIPTION("Image capture bus driver");
MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
MODULE_LICENSE("GPL");
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