static int usblp_open(struct inode *inode, struct file *file)
{
int minor = iminor(inode);
struct usblp *usblp;
struct usb_interface *intf;
int retval;
unsigned long arg = NULL; // Added by PaN. Modified by Jiahao
long ioctl_retval; // Added by Jiahao
if (minor < 0)
return -ENODEV;
mutex_lock(&usblp_mutex);
retval = -ENODEV;
intf = usb_find_interface(&usblp_driver, minor);
if (!intf)
goto out;
usblp = usb_get_intfdata(intf);
if (!usblp || !usblp->dev || !usblp->present)
goto out;
retval = -EBUSY;
if (usblp->used)
goto out;
/*
* We do not implement LP_ABORTOPEN/LPABORTOPEN for two reasons:
* - We do not want persistent state which close(2) does not clear
* - It is not used anyway, according to CUPS people
*/
retval = usb_autopm_get_interface(intf);
if (retval < 0)
goto out;
usblp->used = 1;
file->private_data = usblp;
usblp->wcomplete = 1; /* we begin writeable */
usblp->wstatus = 0;
usblp->rcomplete = 0;
if (handle_bidir(usblp) < 0) {
usb_autopm_put_interface(intf);
usblp->used = 0;
file->private_data = NULL;
retval = -EIO;
}
/* Added by PaN */
if ((ioctl_retval=usblp_ioctl(file, LPGETID, arg)) <0) // modified by Jiahao
{
// Update device id failed
}
out:
mutex_unlock(&usblp_mutex);
return retval;
}
static int usblp_resume(struct usb_interface *intf)
{
struct usblp *usblp = usb_get_intfdata(intf);
int r;
r = handle_bidir(usblp);
return r;
}
static int usblp_open(struct inode *inode, struct file *file)
{
int minor = iminor(inode);
struct usblp *usblp;
struct usb_interface *intf;
int retval;
if (minor < 0)
return -ENODEV;
mutex_lock (&usblp_mutex);
retval = -ENODEV;
intf = usb_find_interface(&usblp_driver, minor);
if (!intf) {
goto out;
}
usblp = usb_get_intfdata (intf);
if (!usblp || !usblp->dev || !usblp->present)
goto out;
retval = -EBUSY;
if (usblp->used)
goto out;
/*
* We do not implement LP_ABORTOPEN/LPABORTOPEN for two reasons:
* - We do not want persistent state which close(2) does not clear
* - It is not used anyway, according to CUPS people
*/
retval = usb_autopm_get_interface(intf);
if (retval < 0)
goto out;
usblp->used = 1;
file->private_data = usblp;
usblp->wcomplete = 1; /* we begin writeable */
usblp->wstatus = 0;
usblp->rcomplete = 0;
if (handle_bidir(usblp) < 0) {
usb_autopm_put_interface(intf);
usblp->used = 0;
file->private_data = NULL;
retval = -EIO;
}
out:
mutex_unlock (&usblp_mutex);
return retval;
}