int a4l_ioctl_devcfg(a4l_cxt_t * cxt, void *arg)
{
int ret = 0;
if (rtdm_in_rt_context())
return -ENOSYS;
if (arg == NULL) {
/* Basic checking */
if (!test_bit(A4L_DEV_ATTACHED_NR, &(a4l_get_dev(cxt)->flags))) {
__a4l_err("a4l_ioctl_devcfg: "
"free device, no driver to detach\n");
return -EINVAL;
}
/* Pre-cleanup of the transfer structure, we ensure
that nothing is busy */
if ((ret = a4l_precleanup_transfer(cxt)) != 0)
return ret;
/* Remove the related proc file */
a4l_proc_detach(cxt);
/* Free the transfer structure and its related data */
if ((ret = a4l_cleanup_transfer(cxt)) != 0)
return ret;
/* Free the device and the driver from each other */
if ((ret = a4l_device_detach(cxt)) == 0)
clear_bit(A4L_DEV_ATTACHED_NR,
&(a4l_get_dev(cxt)->flags));
} else {
/* Basic checking */
if (test_bit
(A4L_DEV_ATTACHED_NR, &(a4l_get_dev(cxt)->flags))) {
__a4l_err("a4l_ioctl_devcfg: "
"linked device, cannot attach more driver\n");
return -EINVAL;
}
/* Pre-initialization of the transfer structure */
a4l_presetup_transfer(cxt);
/* Link the device with the driver */
if ((ret = a4l_device_attach(cxt, arg)) != 0)
return ret;
/* Create the transfer structure and
the related proc file */
if ((ret = a4l_setup_transfer(cxt)) != 0 ||
(ret = a4l_proc_attach(cxt)) != 0)
a4l_device_detach(cxt);
else
set_bit(A4L_DEV_ATTACHED_NR,
&(a4l_get_dev(cxt)->flags));
}
return ret;
}
int a4l_ioctl_devcfg(a4l_cxt_t * cxt, void *arg)
{
int ret = 0;
__a4l_dbg(1, core_dbg,
"a4l_ioctl_devcfg: minor=%d\n", a4l_get_minor(cxt));
if (a4l_test_rt() != 0)
return -EPERM;
if (arg == NULL) {
/* Basic checking */
if (!test_bit
(A4L_DEV_ATTACHED, &(a4l_get_dev(cxt)->flags))) {
__a4l_err("a4l_ioctl_devcfg: "
"free device, no driver to detach\n");
return -EINVAL;
}
/* Removes the related proc file */
a4l_proc_detach(cxt);
/* Frees the transfer structure and its related data */
if ((ret = a4l_cleanup_transfer(cxt)) != 0)
return ret;
/* Frees the device and the driver from each other */
if ((ret = a4l_device_detach(cxt)) == 0)
clear_bit(A4L_DEV_ATTACHED,
&(a4l_get_dev(cxt)->flags));
} else {
/* Basic checking */
if (test_bit
(A4L_DEV_ATTACHED, &(a4l_get_dev(cxt)->flags))) {
__a4l_err("a4l_ioctl_devcfg: "
"linked device, cannot attach more driver\n");
return -EINVAL;
}
/* Pre-initialization of the transfer structure */
a4l_presetup_transfer(cxt);
/* Links the device with the driver */
if ((ret = a4l_device_attach(cxt, arg)) != 0)
return ret;
/* Creates the transfer structure and
the related proc file */
if ((ret = a4l_setup_transfer(cxt)) != 0 ||
(ret = a4l_proc_attach(cxt)) != 0)
a4l_device_detach(cxt);
else
set_bit(A4L_DEV_ATTACHED,
&(a4l_get_dev(cxt)->flags));
}
return ret;
}