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/*
# (C) 2008-2009 Elmar Kleijn <elmar_kleijn@hotmail.com>
# (C) 2008-2009 Sjoerd Piepenbrink <need4weed@gmail.com>
# (C) 2008-2009 Radjnies Bhansingh <radjnies@gmail.com>
# (C) 2008-2009 Hans de Goede <hdegoede@redhat.com>
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <sys/types.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <syscall.h>
#include "libv4lcontrol.h"
#include "libv4lcontrol-priv.h"
/* These headers are not needed by us, but by linux/videodev2.h,
which is broken on some systems and doesn't include them itself :( */
#include <sys/time.h>
#include <linux/types.h>
#include <linux/ioctl.h>
/* end broken header workaround includes */
#include <linux/videodev2.h>
static void v4lcontrol_init(struct v4lcontrol_data *data, int first_time)
{
/* FIXME: Temporary spoof future communication with driver by always enabling
the fake controls */
data->controls = (1 << V4LCONTROL_WHITEBALANCE) |
(1 << V4LCONTROL_NORMALIZE) | (1 << V4LCONTROL_NORM_LOW_BOUND) |
(1 << V4LCONTROL_NORM_HIGH_BOUND);
if (first_time) {
/* Initialize the new shm object when created */
memset(data->shm_values, 0, sizeof(V4LCONTROL_SHM_SIZE));
data->shm_values[V4LCONTROL_WHITEBALANCE] = 1;
data->shm_values[V4LCONTROL_NORM_HIGH_BOUND] = 255;
}
}
struct v4lcontrol_data *v4lcontrol_create(int fd)
{
int shm_fd;
int init = 0;
char shm_name[256];
struct v4l2_capability cap;
struct v4lcontrol_data *data = calloc(1, sizeof(struct v4lcontrol_data));
if (!data)
return NULL;
syscall(SYS_ioctl, fd, VIDIOC_QUERYCAP, &cap);
snprintf(shm_name, 256, "/%s:%s", cap.bus_info, cap.card);
/* Open the shared memory object identified by shm_name */
if ((shm_fd = shm_open(shm_name, (O_CREAT | O_EXCL | O_RDWR),
(S_IREAD | S_IWRITE))) >= 0)
init = 1;
else if ((shm_fd = shm_open(shm_name, O_RDWR, (S_IREAD | S_IWRITE))) < 0)
goto error;
/* Set the shared memory size */
ftruncate(shm_fd, V4LCONTROL_SHM_SIZE);
/* Retreive a pointer to the shm object */
data->shm_values = mmap(NULL, V4LCONTROL_SHM_SIZE, (PROT_READ | PROT_WRITE),
MAP_SHARED, shm_fd, 0);
close(shm_fd);
if (data->shm_values == MAP_FAILED)
goto error;
v4lcontrol_init(data, init); /* Set the driver defined fake controls */
data->fd = fd;
return data;
error:
free(data);
return NULL;
}
void v4lcontrol_destroy(struct v4lcontrol_data *data)
{
munmap(data->shm_values, V4LCONTROL_SHM_SIZE);
free(data);
}
/* FIXME get better CID's for normalize */
struct v4l2_queryctrl fake_controls[V4LCONTROL_COUNT] = {
{
.id = V4L2_CID_AUTO_WHITE_BALANCE,
.type = V4L2_CTRL_TYPE_BOOLEAN,
.name = "Whitebalance",
.minimum = 0,
.maximum = 1,
.step = 1,
.default_value = 1,
.flags = 0
},
{
.id = V4L2_CID_DO_WHITE_BALANCE,
.type = V4L2_CTRL_TYPE_BOOLEAN,
.name = "Normalize",
.minimum = 0,
.maximum = 1,
.step = 1,
.default_value = 0,
.flags = 0
},
{
.id = V4L2_CID_BLACK_LEVEL,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Normalize: low bound",
.minimum = 0,
.maximum = 127,
.step = 1,
.default_value = 0,
.flags = 0
},
{
.id = V4L2_CID_WHITENESS,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Normalize: high bound",
.minimum = 128,
.maximum = 255,
.step = 1,
.default_value = 255,
.flags = 0
},
};
int v4lcontrol_vidioc_queryctrl(struct v4lcontrol_data *data, void *arg)
{
int i;
struct v4l2_queryctrl *ctrl = arg;
for (i = 0; i < V4LCONTROL_COUNT; i++)
if ((data->controls & (1 << i)) &&
ctrl->id == fake_controls[i].id) {
memcpy(ctrl, &fake_controls[i], sizeof(struct v4l2_queryctrl));
return 0;
}
return syscall(SYS_ioctl, data->fd, VIDIOC_QUERYCTRL, arg);
}
int v4lcontrol_vidioc_g_ctrl(struct v4lcontrol_data *data, void *arg)
{
int i;
struct v4l2_control *ctrl = arg;
for (i = 0; i < V4LCONTROL_COUNT; i++)
if ((data->controls & (1 << i)) &&
ctrl->id == fake_controls[i].id) {
ctrl->value = data->shm_values[i];
return 0;
}
return syscall(SYS_ioctl, data->fd, VIDIOC_G_CTRL, arg);
}
int v4lcontrol_vidioc_s_ctrl(struct v4lcontrol_data *data, void *arg)
{
int i;
struct v4l2_control *ctrl = arg;
for (i = 0; i < V4LCONTROL_COUNT; i++)
if ((data->controls & (1 << i)) &&
ctrl->id == fake_controls[i].id) {
if (ctrl->value > fake_controls[i].maximum ||
ctrl->value < fake_controls[i].minimum) {
errno = EINVAL;
return -1;
}
data->shm_values[i] = ctrl->value;
return 0;
}
return syscall(SYS_ioctl, data->fd, VIDIOC_S_CTRL, arg);
}
int v4lcontrol_get_ctrl(struct v4lcontrol_data *data, int ctrl)
{
if (data->controls & (1 << ctrl))
return data->shm_values[ctrl];
return 0;
}
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