printer.c
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上传日期:2013-02-24
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文件大小:20k
- /*
- * printer.c Version 0.8
- *
- * Copyright (c) 1999 Michael Gee <michael@linuxspecific.com>
- * Copyright (c) 1999 Pavel Machek <pavel@suse.cz>
- * Copyright (c) 2000 Randy Dunlap <randy.dunlap@intel.com>
- * Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz>
- *
- * USB Printer Device Class driver for USB printers and printer cables
- *
- * Sponsored by SuSE
- *
- * ChangeLog:
- * v0.1 - thorough cleaning, URBification, almost a rewrite
- * v0.2 - some more cleanups
- * v0.3 - cleaner again, waitqueue fixes
- * v0.4 - fixes in unidirectional mode
- * v0.5 - add DEVICE_ID string support
- * v0.6 - never time out
- * v0.7 - fixed bulk-IN read and poll (David Paschal, paschal@rcsis.com)
- * v0.8 - add devfs support
- * v0.9 - fix unplug-while-open paths
- */
- /*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 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 General Public License for more details.
- *
- * You should have received a copy of the GNU 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 <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/smp_lock.h>
- #include <linux/signal.h>
- #include <linux/poll.h>
- #include <linux/init.h>
- #include <linux/slab.h>
- #include <linux/lp.h>
- #include <linux/devfs_fs_kernel.h>
- #undef DEBUG
- #include <linux/usb.h>
- /*
- * Version Information
- */
- #define DRIVER_VERSION "v0.8"
- #define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap"
- #define DRIVER_DESC "USB Printer Device Class driver"
- #define USBLP_BUF_SIZE 8192
- #define DEVICE_ID_SIZE 1024
- #define IOCNR_GET_DEVICE_ID 1
- #define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len) /* get device_id string */
- #define LPGETSTATUS 0x060b /* same as in drivers/char/lp.c */
- /*
- * A DEVICE_ID string may include the printer's serial number.
- * It should end with a semi-colon (';').
- * An example from an HP 970C DeskJet printer is (this is one long string,
- * with the serial number changed):
- MFG:HEWLETT-PACKARD;MDL:DESKJET 970C;CMD:MLC,PCL,PML;CLASS:PRINTER;DESCRIPTION:Hewlett-Packard DeskJet 970C;SERN:US970CSEPROF;VSTATUS:$HB0$NC0,ff,DN,IDLE,CUT,K1,C0,DP,NR,KP000,CP027;VP:0800,FL,B0;VJ: ;
- */
- /*
- * USB Printer Requests
- */
- #define USBLP_REQ_GET_ID 0x00
- #define USBLP_REQ_GET_STATUS 0x01
- #define USBLP_REQ_RESET 0x02
- #define USBLP_MINORS 16
- #define USBLP_MINOR_BASE 0
- #define USBLP_WRITE_TIMEOUT (5*HZ) /* 5 seconds */
- struct usblp {
- struct usb_device *dev; /* USB device */
- devfs_handle_t devfs; /* devfs device */
- struct semaphore sem; /* locks this struct, especially "dev" */
- struct urb readurb, writeurb; /* The urbs */
- wait_queue_head_t wait; /* Zzzzz ... */
- int readcount; /* Counter for reads */
- int ifnum; /* Interface number */
- int minor; /* minor number of device */
- unsigned int quirks; /* quirks flags */
- unsigned char used; /* True if open */
- unsigned char bidir; /* interface is bidirectional */
- unsigned char *device_id_string; /* IEEE 1284 DEVICE ID string (ptr) */
- /* first 2 bytes are (big-endian) length */
- };
- extern devfs_handle_t usb_devfs_handle; /* /dev/usb dir. */
- static struct usblp *usblp_table[USBLP_MINORS];
- /* Quirks: various printer quirks are handled by this table & its flags. */
- struct quirk_printer_struct {
- __u16 vendorId;
- __u16 productId;
- unsigned int quirks;
- };
- #define USBLP_QUIRK_BIDIR 0x1 /* reports bidir but requires unidirectional mode (no INs/reads) */
- #define USBLP_QUIRK_USB_INIT 0x2 /* needs vendor USB init string */
- static struct quirk_printer_struct quirk_printers[] = {
- { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
- { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
- { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
- { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
- { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
- { 0, 0 }
- };
- /*
- * Functions for usblp control messages.
- */
- static int usblp_ctrl_msg(struct usblp *usblp, int request, int dir, int recip, int value, void *buf, int len)
- {
- int retval = usb_control_msg(usblp->dev,
- dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
- request, USB_TYPE_CLASS | dir | recip, value, usblp->ifnum, buf, len, HZ * 5);
- dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d len: %#x result: %d",
- request, !!dir, recip, value, len, retval);
- return retval < 0 ? retval : 0;
- }
- #define usblp_read_status(usblp, status)
- usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
- #define usblp_get_id(usblp, config, id, maxlen)
- usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
- #define usblp_reset(usblp)
- usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
- /*
- * URB callback.
- */
- static void usblp_bulk(struct urb *urb)
- {
- struct usblp *usblp = urb->context;
- if (!usblp || !usblp->dev || !usblp->used)
- return;
- if (urb->status)
- warn("usblp%d: nonzero read/write bulk status received: %d",
- usblp->minor, urb->status);
- wake_up_interruptible(&usblp->wait);
- }
- /*
- * Get and print printer errors.
- */
- static char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
- static int usblp_check_status(struct usblp *usblp, int err)
- {
- unsigned char status, newerr = 0;
- int error;
- error = usblp_read_status (usblp, &status);
- if (error < 0) {
- err("usblp%d: error %d reading printer status",
- usblp->minor, error);
- return 0;
- }
- if (~status & LP_PERRORP) {
- newerr = 3;
- if (status & LP_POUTPA) newerr = 1;
- if (~status & LP_PSELECD) newerr = 2;
- }
- if (newerr != err)
- info("usblp%d: %s", usblp->minor, usblp_messages[newerr]);
- return newerr;
- }
- /*
- * File op functions.
- */
- static int usblp_open(struct inode *inode, struct file *file)
- {
- int minor = MINOR(inode->i_rdev) - USBLP_MINOR_BASE;
- struct usblp *usblp;
- int retval;
- if (minor < 0 || minor >= USBLP_MINORS)
- return -ENODEV;
- lock_kernel();
- usblp = usblp_table[minor];
- retval = -ENODEV;
- if (!usblp || !usblp->dev)
- goto out;
- retval = -EBUSY;
- if (usblp->used)
- goto out;
- /*
- * TODO: need to implement LP_ABORTOPEN + O_NONBLOCK as in drivers/char/lp.c ???
- * This is #if 0-ed because we *don't* want to fail an open
- * just because the printer is off-line.
- */
- #if 0
- if ((retval = usblp_check_status(usblp, 0))) {
- retval = retval > 1 ? -EIO : -ENOSPC;
- goto out;
- }
- #else
- retval = 0;
- #endif
- usblp->used = 1;
- file->private_data = usblp;
- usblp->writeurb.transfer_buffer_length = 0;
- usblp->writeurb.status = 0;
- if (usblp->bidir) {
- usblp->readcount = 0;
- usblp->readurb.dev = usblp->dev;
- if (usb_submit_urb(&usblp->readurb) < 0) {
- retval = -EIO;
- usblp->used = 0;
- file->private_data = NULL;
- }
- }
- out:
- unlock_kernel();
- return retval;
- }
- static void usblp_cleanup (struct usblp *usblp)
- {
- devfs_unregister (usblp->devfs);
- usblp_table [usblp->minor] = NULL;
- info ("usblp%d: removed", usblp->minor);
- kfree (usblp->writeurb.transfer_buffer);
- kfree (usblp->device_id_string);
- kfree (usblp);
- }
- static int usblp_release(struct inode *inode, struct file *file)
- {
- struct usblp *usblp = file->private_data;
- down (&usblp->sem);
- lock_kernel();
- usblp->used = 0;
- if (usblp->dev) {
- if (usblp->bidir)
- usb_unlink_urb(&usblp->readurb);
- usb_unlink_urb(&usblp->writeurb);
- up(&usblp->sem);
- } else /* finish cleanup from disconnect */
- usblp_cleanup (usblp);
- unlock_kernel();
- return 0;
- }
- /* No kernel lock - fine */
- static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
- {
- struct usblp *usblp = file->private_data;
- poll_wait(file, &usblp->wait, wait);
- return ((!usblp->bidir || usblp->readurb.status == -EINPROGRESS) ? 0 : POLLIN | POLLRDNORM)
- | (usblp->writeurb.status == -EINPROGRESS ? 0 : POLLOUT | POLLWRNORM);
- }
- static int usblp_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
- {
- struct usblp *usblp = file->private_data;
- int length, err;
- unsigned char status;
- int retval = 0;
- down (&usblp->sem);
- if (!usblp->dev) {
- retval = -ENODEV;
- goto done;
- }
- if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */
- switch (_IOC_NR(cmd)) {
- case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
- if (_IOC_DIR(cmd) != _IOC_READ) {
- retval = -EINVAL;
- goto done;
- }
- err = usblp_get_id(usblp, 0, usblp->device_id_string, DEVICE_ID_SIZE - 1);
- if (err < 0) {
- dbg ("usblp%d: error = %d reading IEEE-1284 Device ID string",
- usblp->minor, err);
- usblp->device_id_string[0] = usblp->device_id_string[1] = ' ';
- retval = -EIO;
- goto done;
- }
- length = (usblp->device_id_string[0] << 8) + usblp->device_id_string[1]; /* big-endian */
- if (length < DEVICE_ID_SIZE)
- usblp->device_id_string[length] = ' ';
- else
- usblp->device_id_string[DEVICE_ID_SIZE - 1] = ' ';
- dbg ("usblp%d Device ID string [%d/max %d]='%s'",
- usblp->minor, length, _IOC_SIZE(cmd), &usblp->device_id_string[2]);
- if (length > _IOC_SIZE(cmd)) length = _IOC_SIZE(cmd); /* truncate */
- if (copy_to_user((unsigned char *) arg,
- usblp->device_id_string, (unsigned long) length)) {
- retval = -EFAULT;
- goto done;
- }
- break;
- default:
- retval = -EINVAL;
- }
- else /* old-style ioctl value */
- switch (cmd) {
- case LPGETSTATUS:
- if (usblp_read_status(usblp, &status)) {
- err("usblp%d: failed reading printer status", usblp->minor);
- retval = -EIO;
- goto done;
- }
- if (copy_to_user ((unsigned char *)arg, &status, 1))
- retval = -EFAULT;
- break;
- default:
- retval = -EINVAL;
- }
- done:
- up (&usblp->sem);
- return retval;
- }
- static ssize_t usblp_write(struct file *file, const char *buffer, size_t count, loff_t *ppos)
- {
- struct usblp *usblp = file->private_data;
- int timeout, err = 0, writecount = 0;
- while (writecount < count) {
- // FIXME: only use urb->status inside completion
- // callbacks; this way is racey...
- if (usblp->writeurb.status == -EINPROGRESS) {
- if (file->f_flags & O_NONBLOCK)
- return -EAGAIN;
- timeout = USBLP_WRITE_TIMEOUT;
- while (timeout && usblp->writeurb.status == -EINPROGRESS) {
- if (signal_pending(current))
- return writecount ? writecount : -EINTR;
- timeout = interruptible_sleep_on_timeout(&usblp->wait, timeout);
- }
- }
- down (&usblp->sem);
- if (!usblp->dev) {
- up (&usblp->sem);
- return -ENODEV;
- }
- if (usblp->writeurb.status != 0) {
- if (usblp->quirks & USBLP_QUIRK_BIDIR) {
- if (usblp->writeurb.status != -EINPROGRESS)
- err("usblp%d: error %d writing to printer",
- usblp->minor, usblp->writeurb.status);
- err = usblp->writeurb.status;
- } else
- err = usblp_check_status(usblp, err);
- up (&usblp->sem);
- /* if the fault was due to disconnect, let khubd's
- * call to usblp_disconnect() grab usblp->sem ...
- */
- schedule ();
- continue;
- }
- writecount += usblp->writeurb.transfer_buffer_length;
- usblp->writeurb.transfer_buffer_length = 0;
- if (writecount == count) {
- up (&usblp->sem);
- break;
- }
- usblp->writeurb.transfer_buffer_length = (count - writecount) < USBLP_BUF_SIZE ?
- (count - writecount) : USBLP_BUF_SIZE;
- if (copy_from_user(usblp->writeurb.transfer_buffer, buffer + writecount,
- usblp->writeurb.transfer_buffer_length)) return -EFAULT;
- usblp->writeurb.dev = usblp->dev;
- usb_submit_urb(&usblp->writeurb);
- up (&usblp->sem);
- }
- return count;
- }
- static ssize_t usblp_read(struct file *file, char *buffer, size_t count, loff_t *ppos)
- {
- struct usblp *usblp = file->private_data;
- if (!usblp->bidir)
- return -EINVAL;
- down (&usblp->sem);
- if (!usblp->dev) {
- count = -ENODEV;
- goto done;
- }
- if (usblp->readurb.status == -EINPROGRESS) {
- if (file->f_flags & O_NONBLOCK) {
- count = -EAGAIN;
- goto done;
- }
- // FIXME: only use urb->status inside completion
- // callbacks; this way is racey...
- while (usblp->readurb.status == -EINPROGRESS) {
- if (signal_pending(current)) {
- count = -EINTR;
- goto done;
- }
- up (&usblp->sem);
- interruptible_sleep_on(&usblp->wait);
- down (&usblp->sem);
- }
- }
- if (!usblp->dev) {
- count = -ENODEV;
- goto done;
- }
- if (usblp->readurb.status) {
- err("usblp%d: error %d reading from printer",
- usblp->minor, usblp->readurb.status);
- usblp->readurb.dev = usblp->dev;
- usblp->readcount = 0;
- usb_submit_urb(&usblp->readurb);
- count = -EIO;
- goto done;
- }
- count = count < usblp->readurb.actual_length - usblp->readcount ?
- count : usblp->readurb.actual_length - usblp->readcount;
- if (copy_to_user(buffer, usblp->readurb.transfer_buffer + usblp->readcount, count)) {
- count = -EFAULT;
- goto done;
- }
- if ((usblp->readcount += count) == usblp->readurb.actual_length) {
- usblp->readcount = 0;
- usblp->readurb.dev = usblp->dev;
- usb_submit_urb(&usblp->readurb);
- }
- done:
- up (&usblp->sem);
- return count;
- }
- /*
- * Checks for printers that have quirks, such as requiring unidirectional
- * communication but reporting bidirectional; currently some HP printers
- * have this flaw (HP 810, 880, 895, etc.), or needing an init string
- * sent at each open (like some Epsons).
- * Returns 1 if found, 0 if not found.
- *
- * HP recommended that we use the bidirectional interface but
- * don't attempt any bulk IN transfers from the IN endpoint.
- * Here's some more detail on the problem:
- * The problem is not that it isn't bidirectional though. The problem
- * is that if you request a device ID, or status information, while
- * the buffers are full, the return data will end up in the print data
- * buffer. For example if you make sure you never request the device ID
- * while you are sending print data, and you don't try to query the
- * printer status every couple of milliseconds, you will probably be OK.
- */
- static unsigned int usblp_quirks (__u16 vendor, __u16 product)
- {
- int i;
- for (i = 0; quirk_printers[i].vendorId; i++) {
- if (vendor == quirk_printers[i].vendorId &&
- product == quirk_printers[i].productId)
- return quirk_printers[i].quirks;
- }
- return 0;
- }
- static struct file_operations usblp_fops = {
- owner: THIS_MODULE,
- read: usblp_read,
- write: usblp_write,
- poll: usblp_poll,
- ioctl: usblp_ioctl,
- open: usblp_open,
- release: usblp_release,
- };
- static void *usblp_probe(struct usb_device *dev, unsigned int ifnum,
- const struct usb_device_id *id)
- {
- struct usb_interface_descriptor *interface;
- struct usb_endpoint_descriptor *epread, *epwrite;
- struct usblp *usblp;
- int minor, i, bidir = 0, quirks;
- int alts = dev->actconfig->interface[ifnum].act_altsetting;
- int length, err;
- char *buf;
- char name[6];
- /* If a bidirectional interface exists, use it. */
- for (i = 0; i < dev->actconfig->interface[ifnum].num_altsetting; i++) {
- interface = &dev->actconfig->interface[ifnum].altsetting[i];
- if (interface->bInterfaceClass != 7 || interface->bInterfaceSubClass != 1 ||
- interface->bInterfaceProtocol < 1 || interface->bInterfaceProtocol > 3 ||
- (interface->bInterfaceProtocol > 1 && interface->bNumEndpoints < 2))
- continue;
- if (interface->bInterfaceProtocol > 1) {
- bidir = 1;
- alts = i;
- break;
- }
- }
- interface = &dev->actconfig->interface[ifnum].altsetting[alts];
- if (usb_set_interface(dev, ifnum, alts))
- err("can't set desired altsetting %d on interface %d", alts, ifnum);
- epwrite = interface->endpoint + 0;
- epread = bidir ? interface->endpoint + 1 : NULL;
- if ((epwrite->bEndpointAddress & 0x80) == 0x80) {
- if (interface->bNumEndpoints == 1)
- return NULL;
- epwrite = interface->endpoint + 1;
- epread = bidir ? interface->endpoint + 0 : NULL;
- }
- if ((epwrite->bEndpointAddress & 0x80) == 0x80)
- return NULL;
- if (bidir && (epread->bEndpointAddress & 0x80) != 0x80)
- return NULL;
- for (minor = 0; minor < USBLP_MINORS && usblp_table[minor]; minor++);
- if (usblp_table[minor]) {
- err("no more free usblp devices");
- return NULL;
- }
- if (!(usblp = kmalloc(sizeof(struct usblp), GFP_KERNEL))) {
- err("out of memory");
- return NULL;
- }
- memset(usblp, 0, sizeof(struct usblp));
- init_MUTEX (&usblp->sem);
- /* lookup quirks for this printer */
- quirks = usblp_quirks(dev->descriptor.idVendor, dev->descriptor.idProduct);
- if (bidir && (quirks & USBLP_QUIRK_BIDIR)) {
- bidir = 0;
- epread = NULL;
- info ("Disabling reads from problem bidirectional printer on usblp%d",
- minor);
- }
- usblp->dev = dev;
- usblp->ifnum = ifnum;
- usblp->minor = minor;
- usblp->bidir = bidir;
- usblp->quirks = quirks;
- init_waitqueue_head(&usblp->wait);
- if (!(buf = kmalloc(USBLP_BUF_SIZE * (bidir ? 2 : 1), GFP_KERNEL))) {
- err("out of memory");
- kfree(usblp);
- return NULL;
- }
- if (!(usblp->device_id_string = kmalloc(DEVICE_ID_SIZE, GFP_KERNEL))) {
- err("out of memory");
- kfree(usblp);
- kfree(buf);
- return NULL;
- }
- FILL_BULK_URB(&usblp->writeurb, dev, usb_sndbulkpipe(dev, epwrite->bEndpointAddress),
- buf, 0, usblp_bulk, usblp);
- if (bidir)
- FILL_BULK_URB(&usblp->readurb, dev, usb_rcvbulkpipe(dev, epread->bEndpointAddress),
- buf + USBLP_BUF_SIZE, USBLP_BUF_SIZE, usblp_bulk, usblp);
- /* Get the device_id string if possible. FIXME: Could make this kmalloc(length). */
- err = usblp_get_id(usblp, 0, usblp->device_id_string, DEVICE_ID_SIZE - 1);
- if (err >= 0) {
- length = (usblp->device_id_string[0] << 8) + usblp->device_id_string[1]; /* big-endian */
- if (length < DEVICE_ID_SIZE)
- usblp->device_id_string[length] = ' ';
- else
- usblp->device_id_string[DEVICE_ID_SIZE - 1] = ' ';
- dbg ("usblp%d Device ID string [%d]=%s",
- minor, length, &usblp->device_id_string[2]);
- }
- else {
- err ("usblp%d: error = %d reading IEEE-1284 Device ID string",
- minor, err);
- usblp->device_id_string[0] = usblp->device_id_string[1] = ' ';
- }
- #ifdef DEBUG
- usblp_check_status(usblp, 0);
- #endif
- sprintf(name, "lp%d", minor);
- /* if we have devfs, create with perms=660 */
- usblp->devfs = devfs_register(usb_devfs_handle, name,
- DEVFS_FL_DEFAULT, USB_MAJOR,
- USBLP_MINOR_BASE + minor,
- S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP |
- S_IWGRP, &usblp_fops, NULL);
- info("usblp%d: USB %sdirectional printer dev %d if %d alt %d",
- minor, bidir ? "Bi" : "Uni", dev->devnum, ifnum, alts);
- return usblp_table[minor] = usblp;
- }
- static void usblp_disconnect(struct usb_device *dev, void *ptr)
- {
- struct usblp *usblp = ptr;
- if (!usblp || !usblp->dev) {
- err("bogus disconnect");
- BUG ();
- }
- down (&usblp->sem);
- lock_kernel();
- usblp->dev = NULL;
- usb_unlink_urb(&usblp->writeurb);
- if (usblp->bidir)
- usb_unlink_urb(&usblp->readurb);
- if (!usblp->used)
- usblp_cleanup (usblp);
- else /* cleanup later, on close */
- up (&usblp->sem);
- unlock_kernel();
- }
- static struct usb_device_id usblp_ids [] = {
- { USB_DEVICE_INFO(7, 1, 1) },
- { USB_DEVICE_INFO(7, 1, 2) },
- { USB_DEVICE_INFO(7, 1, 3) },
- { USB_INTERFACE_INFO(7, 1, 1) },
- { USB_INTERFACE_INFO(7, 1, 2) },
- { USB_INTERFACE_INFO(7, 1, 3) },
- { } /* Terminating entry */
- };
- MODULE_DEVICE_TABLE (usb, usblp_ids);
- static struct usb_driver usblp_driver = {
- name: "usblp",
- probe: usblp_probe,
- disconnect: usblp_disconnect,
- fops: &usblp_fops,
- minor: USBLP_MINOR_BASE,
- id_table: usblp_ids,
- };
- static int __init usblp_init(void)
- {
- if (usb_register(&usblp_driver))
- return -1;
- info(DRIVER_VERSION ":" DRIVER_DESC);
- return 0;
- }
- static void __exit usblp_exit(void)
- {
- usb_deregister(&usblp_driver);
- }
- module_init(usblp_init);
- module_exit(usblp_exit);
- MODULE_AUTHOR( DRIVER_AUTHOR );
- MODULE_DESCRIPTION( DRIVER_DESC );
- MODULE_LICENSE("GPL");