drivers/usb/class/usblp.c

   1 /*
   2  * usblp.c  Version 0.13
   3  *
   4  * Copyright (c) 1999 Michael Gee       <michael@linuxspecific.com>
   5  * Copyright (c) 1999 Pavel Machek      <pavel@suse.cz>
   6  * Copyright (c) 2000 Randy Dunlap      <rddunlap@osdl.org>
   7  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
   8  # Copyright (c) 2001 Pete Zaitcev      <zaitcev@redhat.com>
   9  # Copyright (c) 2001 David Paschal     <paschal@rcsis.com>
  10  *
  11  * USB Printer Device Class driver for USB printers and printer cables
  12  *
  13  * Sponsored by SuSE
  14  *
  15  * ChangeLog:
  16  *      v0.1 - thorough cleaning, URBification, almost a rewrite
  17  *      v0.2 - some more cleanups
  18  *      v0.3 - cleaner again, waitqueue fixes
  19  *      v0.4 - fixes in unidirectional mode
  20  *      v0.5 - add DEVICE_ID string support
  21  *      v0.6 - never time out
  22  *      v0.7 - fixed bulk-IN read and poll (David Paschal)
  23  *      v0.8 - add devfs support
  24  *      v0.9 - fix unplug-while-open paths
  25  *      v0.10- remove sleep_on, fix error on oom (oliver@neukum.org)
  26  *      v0.11 - add proto_bias option (Pete Zaitcev)
  27  *      v0.12 - add hpoj.sourceforge.net ioctls (David Paschal)
  28  *      v0.13 - alloc space for statusbuf (<status> not on stack);
  29  *              use usb_buffer_alloc() for read buf & write buf;
  30  */
  31
  32 /*
  33  * This program is free software; you can redistribute it and/or modify
  34  * it under the terms of the GNU General Public License as published by
  35  * the Free Software Foundation; either version 2 of the License, or
  36  * (at your option) any later version.
  37  *
  38  * This program is distributed in the hope that it will be useful,
  39  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  40  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  41  * GNU General Public License for more details.
  42  *
  43  * You should have received a copy of the GNU General Public License
  44  * along with this program; if not, write to the Free Software
  45  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  46  */
  47
  48 #include <linux/module.h>
  49 #include <linux/kernel.h>
  50 #include <linux/sched.h>
  51 #include <linux/smp_lock.h>
  52 #include <linux/signal.h>
  53 #include <linux/poll.h>
  54 #include <linux/init.h>
  55 #include <linux/slab.h>
  56 #include <linux/lp.h>
  57 #undef DEBUG
  58 #include <linux/usb.h>
  59
  60 /*
  61  * Version Information
  62  */
  63 #define DRIVER_VERSION "v0.13"
  64 #define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal"
  65 #define DRIVER_DESC "USB Printer Device Class driver"
  66
  67 #define USBLP_BUF_SIZE          8192
  68 #define USBLP_DEVICE_ID_SIZE    1024
  69
  70 /* ioctls: */
  71 #define LPGETSTATUS             0x060b          /* same as in drivers/char/lp.c */
  72 #define IOCNR_GET_DEVICE_ID             1
  73 #define IOCNR_GET_PROTOCOLS             2
  74 #define IOCNR_SET_PROTOCOL              3
  75 #define IOCNR_HP_SET_CHANNEL            4
  76 #define IOCNR_GET_BUS_ADDRESS           5
  77 #define IOCNR_GET_VID_PID               6
  78 /* Get device_id string: */
  79 #define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len)
  80 /* The following ioctls were added for http://hpoj.sourceforge.net: */
  81 /* Get two-int array:
  82  * [0]=current protocol (1=7/1/1, 2=7/1/2, 3=7/1/3),
  83  * [1]=supported protocol mask (mask&(1<<n)!=0 means 7/1/n supported): */
  84 #define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
  85 /* Set protocol (arg: 1=7/1/1, 2=7/1/2, 3=7/1/3): */
  86 #define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0)
  87 /* Set channel number (HP Vendor-specific command): */
  88 #define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0)
  89 /* Get two-int array: [0]=bus number, [1]=device address: */
  90 #define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len)
  91 /* Get two-int array: [0]=vendor ID, [1]=product ID: */
  92 #define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len)
  93
  94 /*
  95  * A DEVICE_ID string may include the printer's serial number.
  96  * It should end with a semi-colon (';').
  97  * An example from an HP 970C DeskJet printer is (this is one long string,
  98  * with the serial number changed):
  99 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:                    ;
 100  */
 101
 102 /*
 103  * USB Printer Requests
 104  */
 105
 106 #define USBLP_REQ_GET_ID                        0x00
 107 #define USBLP_REQ_GET_STATUS                    0x01
 108 #define USBLP_REQ_RESET                         0x02
 109 #define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST     0x00    /* HP Vendor-specific */
 110
 111 #define USBLP_MINORS            16
 112 #define USBLP_MINOR_BASE        0
 113
 114 #define USBLP_WRITE_TIMEOUT     (5*HZ)                  /* 5 seconds */
 115
 116 #define USBLP_FIRST_PROTOCOL    1
 117 #define USBLP_LAST_PROTOCOL     3
 118 #define USBLP_MAX_PROTOCOLS     (USBLP_LAST_PROTOCOL+1)
 119
 120 /*
 121  * some arbitrary status buffer size;
 122  * need a status buffer that is allocated via kmalloc(), not on stack
 123  */
 124 #define STATUS_BUF_SIZE         8
 125
 126 struct usblp {
 127         struct usb_device       *dev;                   /* USB device */
 128         struct semaphore        sem;                    /* locks this struct, especially "dev" */
 129         char                    *writebuf;              /* write transfer_buffer */
 130         char                    *readbuf;               /* read transfer_buffer */
 131         char                    *statusbuf;             /* status transfer_buffer */
 132         struct urb              *readurb, *writeurb;    /* The urbs */
 133         wait_queue_head_t       wait;                   /* Zzzzz ... */
 134         int                     readcount;              /* Counter for reads */
 135         int                     ifnum;                  /* Interface number */
 136         struct usb_interface    *intf;                  /* The interface */
 137         /* Alternate-setting numbers and endpoints for each protocol
 138          * (7/1/{index=1,2,3}) that the device supports: */
 139         struct {
 140                 int                             alt_setting;
 141                 struct usb_endpoint_descriptor  *epwrite;
 142                 struct usb_endpoint_descriptor  *epread;
 143         }                       protocol[USBLP_MAX_PROTOCOLS];
 144         int                     current_protocol;
 145         int                     minor;                  /* minor number of device */
 146         int                     wcomplete;              /* writing is completed */
 147         int                     rcomplete;              /* reading is completed */
 148         unsigned int            quirks;                 /* quirks flags */
 149         unsigned char           used;                   /* True if open */
 150         unsigned char           present;                /* True if not disconnected */
 151         unsigned char           bidir;                  /* interface is bidirectional */
 152         unsigned char           *device_id_string;      /* IEEE 1284 DEVICE ID string (ptr) */
 153                                                         /* first 2 bytes are (big-endian) length */
 154 };
 155
 156 #ifdef DEBUG
 157 static void usblp_dump(struct usblp *usblp) {
 158         int p;
 159
 160         dbg("usblp=0x%p", usblp);
 161         dbg("dev=0x%p", usblp->dev);
 162         dbg("present=%d", usblp->present);
 163         dbg("readbuf=0x%p", usblp->readbuf);
 164         dbg("writebuf=0x%p", usblp->writebuf);
 165         dbg("readurb=0x%p", usblp->readurb);
 166         dbg("writeurb=0x%p", usblp->writeurb);
 167         dbg("readcount=%d", usblp->readcount);
 168         dbg("ifnum=%d", usblp->ifnum);
 169     for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
 170         dbg("protocol[%d].alt_setting=%d", p, usblp->protocol[p].alt_setting);
 171         dbg("protocol[%d].epwrite=%p", p, usblp->protocol[p].epwrite);
 172         dbg("protocol[%d].epread=%p", p, usblp->protocol[p].epread);
 173     }
 174         dbg("current_protocol=%d", usblp->current_protocol);
 175         dbg("minor=%d", usblp->minor);
 176         dbg("wcomplete=%d", usblp->wcomplete);
 177         dbg("rcomplete=%d", usblp->rcomplete);
 178         dbg("quirks=%d", usblp->quirks);
 179         dbg("used=%d", usblp->used);
 180         dbg("bidir=%d", usblp->bidir);
 181         dbg("device_id_string=\"%s\"",
 182                 usblp->device_id_string ?
 183                         usblp->device_id_string + 2 :
 184                         (unsigned char *)"(null)");
 185 }
 186 #endif
 187
 188 /* Quirks: various printer quirks are handled by this table & its flags. */
 189
 190 struct quirk_printer_struct {
 191         __u16 vendorId;
 192         __u16 productId;
 193         unsigned int quirks;
 194 };
 195
 196 #define USBLP_QUIRK_BIDIR       0x1     /* reports bidir but requires unidirectional mode (no INs/reads) */
 197 #define USBLP_QUIRK_USB_INIT    0x2     /* needs vendor USB init string */
 198
 199 static struct quirk_printer_struct quirk_printers[] = {
 200         { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
 201         { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
 202         { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
 203         { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
 204         { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
 205         { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
 206         { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */
 207         { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */
 208         { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
 209         { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
 210         { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
 211         { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
 212         { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
 213         { 0, 0 }
 214 };
 215
 216 static int usblp_select_alts(struct usblp *usblp);
 217 static int usblp_set_protocol(struct usblp *usblp, int protocol);
 218 static int usblp_cache_device_id_string(struct usblp *usblp);
 219
 220 /* forward reference to make our lives easier */
 221 extern struct usb_driver usblp_driver;
 222
 223 /*
 224  * Functions for usblp control messages.
 225  */
 226
 227 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
 228 {
 229         int retval = usb_control_msg(usblp->dev,
 230                 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
 231                 request, type | dir | recip, value, usblp->ifnum, buf, len, USBLP_WRITE_TIMEOUT);
 232         dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d len: %#x result: %d",
 233                 request, !!dir, recip, value, len, retval);
 234         return retval < 0 ? retval : 0;
 235 }
 236
 237 #define usblp_read_status(usblp, status)\
 238         usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
 239 #define usblp_get_id(usblp, config, id, maxlen)\
 240         usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
 241 #define usblp_reset(usblp)\
 242         usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
 243
 244 #define usblp_hp_channel_change_request(usblp, channel, buffer) \
 245         usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
 246
 247 /*
 248  * See the description for usblp_select_alts() below for the usage
 249  * explanation.  Look into your /proc/bus/usb/devices and dmesg in
 250  * case of any trouble.
 251  */
 252 static int proto_bias = -1;
 253
 254 /*
 255  * URB callback.
 256  */
 257
 258 static void usblp_bulk_read(struct urb *urb, struct pt_regs *regs)
 259 {
 260         struct usblp *usblp = urb->context;
 261
 262         if (!usblp || !usblp->dev || !usblp->used || !usblp->present)
 263                 return;
 264
 265         if (unlikely(urb->status))
 266                 warn("usblp%d: nonzero read/write bulk status received: %d",
 267                         usblp->minor, urb->status);
 268         usblp->rcomplete = 1;
 269         wake_up_interruptible(&usblp->wait);
 270 }
 271
 272 static void usblp_bulk_write(struct urb *urb, struct pt_regs *regs)
 273 {
 274         struct usblp *usblp = urb->context;
 275
 276         if (!usblp || !usblp->dev || !usblp->used || !usblp->present)
 277                 return;
 278
 279         if (unlikely(urb->status))
 280                 warn("usblp%d: nonzero read/write bulk status received: %d",
 281                         usblp->minor, urb->status);
 282         usblp->wcomplete = 1;
 283         wake_up_interruptible(&usblp->wait);
 284 }
 285
 286 /*
 287  * Get and print printer errors.
 288  */
 289
 290 static char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
 291
 292 static int usblp_check_status(struct usblp *usblp, int err)
 293 {
 294         unsigned char status, newerr = 0;
 295         int error;
 296
 297         error = usblp_read_status (usblp, usblp->statusbuf);
 298         if (error < 0) {
 299                 err("usblp%d: error %d reading printer status",
 300                         usblp->minor, error);
 301                 return 0;
 302         }
 303
 304         status = *usblp->statusbuf;
 305
 306         if (~status & LP_PERRORP)
 307                 newerr = 3;
 308         if (status & LP_POUTPA)
 309                 newerr = 1;
 310         if (~status & LP_PSELECD)
 311                 newerr = 2;
 312
 313         if (newerr != err)
 314                 info("usblp%d: %s", usblp->minor, usblp_messages[newerr]);
 315
 316         return newerr;
 317 }
 318
 319 /*
 320  * File op functions.
 321  */
 322
 323 static int usblp_open(struct inode *inode, struct file *file)
 324 {
 325         int minor = iminor(inode);
 326         struct usblp *usblp;
 327         struct usb_interface *intf;
 328         int retval;
 329
 330         if (minor < 0)
 331                 return -ENODEV;
 332
 333         lock_kernel();
 334
 335         retval = -ENODEV;
 336         intf = usb_find_interface(&usblp_driver, minor);
 337         if (!intf) {
 338                 goto out;
 339         }
 340         usblp = usb_get_intfdata (intf);
 341         if (!usblp || !usblp->dev || !usblp->present)
 342                 goto out;
 343
 344         retval = -EBUSY;
 345         if (usblp->used)
 346                 goto out;
 347
 348         /*
 349          * TODO: need to implement LP_ABORTOPEN + O_NONBLOCK as in drivers/char/lp.c ???
 350          * This is #if 0-ed because we *don't* want to fail an open
 351          * just because the printer is off-line.
 352          */
 353 #if 0
 354         if ((retval = usblp_check_status(usblp, 0))) {
 355                 retval = retval > 1 ? -EIO : -ENOSPC;
 356                 goto out;
 357         }
 358 #else
 359         retval = 0;
 360 #endif
 361
 362         usblp->used = 1;
 363         file->private_data = usblp;
 364
 365         usblp->writeurb->transfer_buffer_length = 0;
 366         usblp->wcomplete = 1; /* we begin writeable */
 367         usblp->rcomplete = 0;
 368
 369         if (usblp->bidir) {
 370                 usblp->readcount = 0;
 371                 usblp->readurb->dev = usblp->dev;
 372                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) {
 373                         retval = -EIO;
 374                         usblp->used = 0;
 375                         file->private_data = NULL;
 376                 }
 377         }
 378 out:
 379         unlock_kernel();
 380         return retval;
 381 }
 382
 383 static void usblp_cleanup (struct usblp *usblp)
 384 {
 385         info("usblp%d: removed", usblp->minor);
 386
 387         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 388                         usblp->writebuf, usblp->writeurb->transfer_dma);
 389         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 390                         usblp->readbuf, usblp->readurb->transfer_dma);
 391         kfree (usblp->device_id_string);
 392         kfree (usblp->statusbuf);
 393         usb_free_urb(usblp->writeurb);
 394         usb_free_urb(usblp->readurb);
 395         kfree (usblp);
 396 }
 397
 398 static void usblp_unlink_urbs(struct usblp *usblp)
 399 {
 400         usb_unlink_urb(usblp->writeurb);
 401         if (usblp->bidir)
 402                 usb_unlink_urb(usblp->readurb);
 403 }
 404
 405 static int usblp_release(struct inode *inode, struct file *file)
 406 {
 407         struct usblp *usblp = file->private_data;
 408
 409         down (&usblp->sem);
 410         usblp->used = 0;
 411         if (usblp->present) {
 412                 usblp_unlink_urbs(usblp);
 413                 up(&usblp->sem);
 414         } else          /* finish cleanup from disconnect */
 415                 usblp_cleanup (usblp);
 416         return 0;
 417 }
 418
 419 /* No kernel lock - fine */
 420 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
 421 {
 422         struct usblp *usblp = file->private_data;
 423         poll_wait(file, &usblp->wait, wait);
 424         return ((!usblp->bidir || !usblp->rcomplete) ? 0 : POLLIN  | POLLRDNORM)
 425                                | (!usblp->wcomplete ? 0 : POLLOUT | POLLWRNORM);
 426 }
 427
 428 static int usblp_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 429 {
 430         struct usblp *usblp = file->private_data;
 431         int length, err, i;
 432         unsigned char newChannel;
 433         int status;
 434         int twoints[2];
 435         int retval = 0;
 436
 437         down (&usblp->sem);
 438         if (!usblp->present) {
 439                 retval = -ENODEV;
 440                 goto done;
 441         }
 442
 443         if (_IOC_TYPE(cmd) == 'P')      /* new-style ioctl number */
 444
 445                 switch (_IOC_NR(cmd)) {
 446
 447                         case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
 448                                 if (_IOC_DIR(cmd) != _IOC_READ) {
 449                                         retval = -EINVAL;
 450                                         goto done;
 451                                 }
 452
 453                                 length = usblp_cache_device_id_string(usblp);
 454                                 if (length < 0) {
 455                                         retval = length;
 456                                         goto done;
 457                                 }
 458                                 if (length > _IOC_SIZE(cmd))
 459                                         length = _IOC_SIZE(cmd); /* truncate */
 460
 461                                 if (copy_to_user((void __user *) arg,
 462                                                 usblp->device_id_string,
 463                                                 (unsigned long) length)) {
 464                                         retval = -EFAULT;
 465                                         goto done;
 466                                 }
 467
 468                                 break;
 469
 470                         case IOCNR_GET_PROTOCOLS:
 471                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 472                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 473                                         retval = -EINVAL;
 474                                         goto done;
 475                                 }
 476
 477                                 twoints[0] = usblp->current_protocol;
 478                                 twoints[1] = 0;
 479                                 for (i = USBLP_FIRST_PROTOCOL;
 480                                      i <= USBLP_LAST_PROTOCOL; i++) {
 481                                         if (usblp->protocol[i].alt_setting >= 0)
 482                                                 twoints[1] |= (1<<i);
 483                                 }
 484
 485                                 if (copy_to_user((void __user *)arg,
 486                                                 (unsigned char *)twoints,
 487                                                 sizeof(twoints))) {
 488                                         retval = -EFAULT;
 489                                         goto done;
 490                                 }
 491
 492                                 break;
 493
 494                         case IOCNR_SET_PROTOCOL:
 495                                 if (_IOC_DIR(cmd) != _IOC_WRITE) {
 496                                         retval = -EINVAL;
 497                                         goto done;
 498                                 }
 499
 500 #ifdef DEBUG
 501                                 if (arg == -10) {
 502                                         usblp_dump(usblp);
 503                                         break;
 504                                 }
 505 #endif
 506
 507                                 usblp_unlink_urbs(usblp);
 508                                 retval = usblp_set_protocol(usblp, arg);
 509                                 if (retval < 0) {
 510                                         usblp_set_protocol(usblp,
 511                                                 usblp->current_protocol);
 512                                 }
 513                                 break;
 514
 515                         case IOCNR_HP_SET_CHANNEL:
 516                                 if (_IOC_DIR(cmd) != _IOC_WRITE ||
 517                                     usblp->dev->descriptor.idVendor != 0x03F0 ||
 518                                     usblp->quirks & USBLP_QUIRK_BIDIR) {
 519                                         retval = -EINVAL;
 520                                         goto done;
 521                                 }
 522
 523                                 err = usblp_hp_channel_change_request(usblp,
 524                                         arg, &newChannel);
 525                                 if (err < 0) {
 526                                         err("usblp%d: error = %d setting "
 527                                                 "HP channel",
 528                                                 usblp->minor, err);
 529                                         retval = -EIO;
 530                                         goto done;
 531                                 }
 532
 533                                 dbg("usblp%d requested/got HP channel %ld/%d",
 534                                         usblp->minor, arg, newChannel);
 535                                 break;
 536
 537                         case IOCNR_GET_BUS_ADDRESS:
 538                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 539                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 540                                         retval = -EINVAL;
 541                                         goto done;
 542                                 }
 543
 544                                 twoints[0] = usblp->dev->bus->busnum;
 545                                 twoints[1] = usblp->dev->devnum;
 546                                 if (copy_to_user((void __user *)arg,
 547                                                 (unsigned char *)twoints,
 548                                                 sizeof(twoints))) {
 549                                         retval = -EFAULT;
 550                                         goto done;
 551                                 }
 552
 553                                 dbg("usblp%d is bus=%d, device=%d",
 554                                         usblp->minor, twoints[0], twoints[1]);
 555                                 break;
 556
 557                         case IOCNR_GET_VID_PID:
 558                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 559                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 560                                         retval = -EINVAL;
 561                                         goto done;
 562                                 }
 563
 564                                 twoints[0] = usblp->dev->descriptor.idVendor;
 565                                 twoints[1] = usblp->dev->descriptor.idProduct;
 566                                 if (copy_to_user((void __user *)arg,
 567                                                 (unsigned char *)twoints,
 568                                                 sizeof(twoints))) {
 569                                         retval = -EFAULT;
 570                                         goto done;
 571                                 }
 572
 573                                 dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X",
 574                                         usblp->minor, twoints[0], twoints[1]);
 575                                 break;
 576
 577                         default:
 578                                 retval = -ENOTTY;
 579                 }
 580         else    /* old-style ioctl value */
 581                 switch (cmd) {
 582
 583                         case LPGETSTATUS:
 584                                 if (usblp_read_status(usblp, usblp->statusbuf)) {
 585                                         err("usblp%d: failed reading printer status", usblp->minor);
 586                                         retval = -EIO;
 587                                         goto done;
 588                                 }
 589                                 status = *usblp->statusbuf;
 590                                 if (copy_to_user ((void __user *)arg, &status, sizeof(int)))
 591                                         retval = -EFAULT;
 592                                 break;
 593
 594                         default:
 595                                 retval = -ENOTTY;
 596                 }
 597
 598 done:
 599         up (&usblp->sem);
 600         return retval;
 601 }
 602
 603 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 604 {
 605         DECLARE_WAITQUEUE(wait, current);
 606         struct usblp *usblp = file->private_data;
 607         int timeout, err = 0, transfer_length = 0;
 608         size_t writecount = 0;
 609
 610         while (writecount < count) {
 611                 if (!usblp->wcomplete) {
 612                         barrier();
 613                         if (file->f_flags & O_NONBLOCK) {
 614                                 writecount += transfer_length;
 615                                 return writecount ? writecount : -EAGAIN;
 616                         }
 617
 618                         timeout = USBLP_WRITE_TIMEOUT;
 619                         add_wait_queue(&usblp->wait, &wait);
 620                         while ( 1==1 ) {
 621
 622                                 if (signal_pending(current)) {
 623                                         remove_wait_queue(&usblp->wait, &wait);
 624                                         return writecount ? writecount : -EINTR;
 625                                 }
 626                                 set_current_state(TASK_INTERRUPTIBLE);
 627                                 if (timeout && !usblp->wcomplete) {
 628                                         timeout = schedule_timeout(timeout);
 629                                 } else {
 630                                         set_current_state(TASK_RUNNING);
 631                                         break;
 632                                 }
 633                         }
 634                         remove_wait_queue(&usblp->wait, &wait);
 635                 }
 636
 637                 down (&usblp->sem);
 638                 if (!usblp->present) {
 639                         up (&usblp->sem);
 640                         return -ENODEV;
 641                 }
 642
 643                 if (usblp->writeurb->status != 0) {
 644                         if (usblp->quirks & USBLP_QUIRK_BIDIR) {
 645                                 if (!usblp->wcomplete)
 646                                         err("usblp%d: error %d writing to printer",
 647                                                 usblp->minor, usblp->writeurb->status);
 648                                 err = usblp->writeurb->status;
 649                         } else
 650                                 err = usblp_check_status(usblp, err);
 651                         up (&usblp->sem);
 652
 653                         /* if the fault was due to disconnect, let khubd's
 654                          * call to usblp_disconnect() grab usblp->sem ...
 655                          */
 656                         schedule ();
 657                         continue;
 658                 }
 659
 660                 /* We must increment writecount here, and not at the
 661                  * end of the loop. Otherwise, the final loop iteration may
 662                  * be skipped, leading to incomplete printer output.
 663                  */
 664                 writecount += transfer_length;
 665                 if (writecount == count) {
 666                         up(&usblp->sem);
 667                         break;
 668                 }
 669
 670                 transfer_length=(count - writecount);
 671                 if (transfer_length > USBLP_BUF_SIZE)
 672                         transfer_length = USBLP_BUF_SIZE;
 673
 674                 usblp->writeurb->transfer_buffer_length = transfer_length;
 675
 676                 if (copy_from_user(usblp->writeurb->transfer_buffer,
 677                                    buffer + writecount, transfer_length)) {
 678                         up(&usblp->sem);
 679                         return writecount ? writecount : -EFAULT;
 680                 }
 681
 682                 usblp->writeurb->dev = usblp->dev;
 683                 usblp->wcomplete = 0;
 684                 err = usb_submit_urb(usblp->writeurb, GFP_KERNEL);
 685                 if (err) {
 686                         if (err != -ENOMEM)
 687                                 count = -EIO;
 688                         else
 689                                 count = writecount ? writecount : -ENOMEM;
 690                         up (&usblp->sem);
 691                         break;
 692                 }
 693                 up (&usblp->sem);
 694         }
 695
 696         return count;
 697 }
 698
 699 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 700 {
 701         struct usblp *usblp = file->private_data;
 702         DECLARE_WAITQUEUE(wait, current);
 703
 704         if (!usblp->bidir)
 705                 return -EINVAL;
 706
 707         down (&usblp->sem);
 708         if (!usblp->present) {
 709                 count = -ENODEV;
 710                 goto done;
 711         }
 712
 713         if (!usblp->rcomplete) {
 714                 barrier();
 715
 716                 if (file->f_flags & O_NONBLOCK) {
 717                         count = -EAGAIN;
 718                         goto done;
 719                 }
 720
 721                 add_wait_queue(&usblp->wait, &wait);
 722                 while (1==1) {
 723                         if (signal_pending(current)) {
 724                                 count = -EINTR;
 725                                 remove_wait_queue(&usblp->wait, &wait);
 726                                 goto done;
 727                         }
 728                         up (&usblp->sem);
 729                         set_current_state(TASK_INTERRUPTIBLE);
 730                         if (!usblp->rcomplete) {
 731                                 schedule();
 732                         } else {
 733                                 set_current_state(TASK_RUNNING);
 734                                 break;
 735                         }
 736                         down (&usblp->sem);
 737                 }
 738                 remove_wait_queue(&usblp->wait, &wait);
 739         }
 740
 741         if (!usblp->present) {
 742                 count = -ENODEV;
 743                 goto done;
 744         }
 745
 746         if (usblp->readurb->status) {
 747                 err("usblp%d: error %d reading from printer",
 748                         usblp->minor, usblp->readurb->status);
 749                 usblp->readurb->dev = usblp->dev;
 750                 usblp->readcount = 0;
 751                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0)
 752                         dbg("error submitting urb");
 753                 count = -EIO;
 754                 goto done;
 755         }
 756
 757         count = count < usblp->readurb->actual_length - usblp->readcount ?
 758                 count : usblp->readurb->actual_length - usblp->readcount;
 759
 760         if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) {
 761                 count = -EFAULT;
 762                 goto done;
 763         }
 764
 765         if ((usblp->readcount += count) == usblp->readurb->actual_length) {
 766                 usblp->readcount = 0;
 767                 usblp->readurb->dev = usblp->dev;
 768                 usblp->rcomplete = 0;
 769                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL)) {
 770                         count = -EIO;
 771                         goto done;
 772                 }
 773         }
 774
 775 done:
 776         up (&usblp->sem);
 777         return count;
 778 }
 779
 780 /*
 781  * Checks for printers that have quirks, such as requiring unidirectional
 782  * communication but reporting bidirectional; currently some HP printers
 783  * have this flaw (HP 810, 880, 895, etc.), or needing an init string
 784  * sent at each open (like some Epsons).
 785  * Returns 1 if found, 0 if not found.
 786  *
 787  * HP recommended that we use the bidirectional interface but
 788  * don't attempt any bulk IN transfers from the IN endpoint.
 789  * Here's some more detail on the problem:
 790  * The problem is not that it isn't bidirectional though. The problem
 791  * is that if you request a device ID, or status information, while
 792  * the buffers are full, the return data will end up in the print data
 793  * buffer. For example if you make sure you never request the device ID
 794  * while you are sending print data, and you don't try to query the
 795  * printer status every couple of milliseconds, you will probably be OK.
 796  */
 797 static unsigned int usblp_quirks (__u16 vendor, __u16 product)
 798 {
 799         int i;
 800
 801         for (i = 0; quirk_printers[i].vendorId; i++) {
 802                 if (vendor == quirk_printers[i].vendorId &&
 803                     product == quirk_printers[i].productId)
 804                         return quirk_printers[i].quirks;
 805         }
 806         return 0;
 807 }
 808
 809 static struct file_operations usblp_fops = {
 810         .owner =        THIS_MODULE,
 811         .read =         usblp_read,
 812         .write =        usblp_write,
 813         .poll =         usblp_poll,
 814         .ioctl =        usblp_ioctl,
 815         .open =         usblp_open,
 816         .release =      usblp_release,
 817 };
 818
 819 static struct usb_class_driver usblp_class = {
 820         .name =         "usb/lp%d",
 821         .fops =         &usblp_fops,
 822         .mode =         S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,
 823         .minor_base =   USBLP_MINOR_BASE,
 824 };
 825
 826 static int usblp_probe(struct usb_interface *intf,
 827                        const struct usb_device_id *id)
 828 {
 829         struct usb_device *dev = interface_to_usbdev (intf);
 830         struct usblp *usblp = 0;
 831         int protocol;
 832         int retval;
 833
 834         /* Malloc and start initializing usblp structure so we can use it
 835          * directly. */
 836         if (!(usblp = kmalloc(sizeof(struct usblp), GFP_KERNEL))) {
 837                 err("out of memory for usblp");
 838                 goto abort;
 839         }
 840         memset(usblp, 0, sizeof(struct usblp));
 841         usblp->dev = dev;
 842         init_MUTEX (&usblp->sem);
 843         init_waitqueue_head(&usblp->wait);
 844         usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
 845         usblp->intf = intf;
 846
 847         usblp->writeurb = usb_alloc_urb(0, GFP_KERNEL);
 848         if (!usblp->writeurb) {
 849                 err("out of memory");
 850                 goto abort;
 851         }
 852         usblp->readurb = usb_alloc_urb(0, GFP_KERNEL);
 853         if (!usblp->readurb) {
 854                 err("out of memory");
 855                 goto abort;
 856         }
 857
 858         /* Malloc device ID string buffer to the largest expected length,
 859          * since we can re-query it on an ioctl and a dynamic string
 860          * could change in length. */
 861         if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
 862                 err("out of memory for device_id_string");
 863                 goto abort;
 864         }
 865
 866         usblp->writebuf = usblp->readbuf = NULL;
 867         usblp->writeurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 868         usblp->readurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 869         /* Malloc write & read buffers.  We somewhat wastefully
 870          * malloc both regardless of bidirectionality, because the
 871          * alternate setting can be changed later via an ioctl. */
 872         if (!(usblp->writebuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
 873                                 GFP_KERNEL, &usblp->writeurb->transfer_dma))) {
 874                 err("out of memory for write buf");
 875                 goto abort;
 876         }
 877         if (!(usblp->readbuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
 878                                 GFP_KERNEL, &usblp->readurb->transfer_dma))) {
 879                 err("out of memory for read buf");
 880                 goto abort;
 881         }
 882
 883         /* Allocate buffer for printer status */
 884         usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
 885         if (!usblp->statusbuf) {
 886                 err("out of memory for statusbuf");
 887                 goto abort;
 888         }
 889
 890         /* Lookup quirks for this printer. */
 891         usblp->quirks = usblp_quirks(
 892                 dev->descriptor.idVendor,
 893                 dev->descriptor.idProduct);
 894
 895         /* Analyze and pick initial alternate settings and endpoints. */
 896         protocol = usblp_select_alts(usblp);
 897         if (protocol < 0) {
 898                 dbg("incompatible printer-class device 0x%4.4X/0x%4.4X",
 899                         dev->descriptor.idVendor,
 900                         dev->descriptor.idProduct);
 901                 goto abort;
 902         }
 903
 904         /* Setup the selected alternate setting and endpoints. */
 905         if (usblp_set_protocol(usblp, protocol) < 0)
 906                 goto abort;
 907
 908         /* Retrieve and store the device ID string. */
 909         usblp_cache_device_id_string(usblp);
 910
 911 #ifdef DEBUG
 912         usblp_check_status(usblp, 0);
 913 #endif
 914
 915         info("usblp%d: USB %sdirectional printer dev %d "
 916                 "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X",
 917                 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
 918                 usblp->ifnum,
 919                 usblp->protocol[usblp->current_protocol].alt_setting,
 920                 usblp->current_protocol, usblp->dev->descriptor.idVendor,
 921                 usblp->dev->descriptor.idProduct);
 922
 923         usb_set_intfdata (intf, usblp);
 924
 925         usblp->present = 1;
 926
 927         retval = usb_register_dev(intf, &usblp_class);
 928         if (retval) {
 929                 err("Not able to get a minor for this device.");
 930                 goto abort_intfdata;
 931         }
 932         usblp->minor = intf->minor;
 933
 934         return 0;
 935
 936 abort_intfdata:
 937         usb_set_intfdata (intf, NULL);
 938 abort:
 939         if (usblp) {
 940                 if (usblp->writebuf)
 941                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 942                                 usblp->writebuf, usblp->writeurb->transfer_dma);
 943                 if (usblp->readbuf)
 944                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 945                                 usblp->readbuf, usblp->writeurb->transfer_dma);
 946                 kfree(usblp->statusbuf);
 947                 kfree(usblp->device_id_string);
 948                 usb_free_urb(usblp->writeurb);
 949                 usb_free_urb(usblp->readurb);
 950                 kfree(usblp);
 951         }
 952         return -EIO;
 953 }
 954
 955 /*
 956  * We are a "new" style driver with usb_device_id table,
 957  * but our requirements are too intricate for simple match to handle.
 958  *
 959  * The "proto_bias" option may be used to specify the preferred protocol
 960  * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3).  If the device
 961  * supports the preferred protocol, then we bind to it.
 962  *
 963  * The best interface for us is 7/1/2, because it is compatible
 964  * with a stream of characters. If we find it, we bind to it.
 965  *
 966  * Note that the people from hpoj.sourceforge.net need to be able to
 967  * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
 968  *
 969  * Failing 7/1/2, we look for 7/1/3, even though it's probably not
 970  * stream-compatible, because this matches the behaviour of the old code.
 971  *
 972  * If nothing else, we bind to 7/1/1 - the unidirectional interface.
 973  */
 974 static int usblp_select_alts(struct usblp *usblp)
 975 {
 976         struct usb_interface *if_alt;
 977         struct usb_host_interface *ifd;
 978         struct usb_endpoint_descriptor *epd, *epwrite, *epread;
 979         int p, i, e;
 980
 981         if_alt = usblp->intf;
 982
 983         for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
 984                 usblp->protocol[p].alt_setting = -1;
 985
 986         /* Find out what we have. */
 987         for (i = 0; i < if_alt->num_altsetting; i++) {
 988                 ifd = &if_alt->altsetting[i];
 989
 990                 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
 991                         continue;
 992
 993                 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
 994                     ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
 995                         continue;
 996
 997                 /* Look for bulk OUT and IN endpoints. */
 998                 epwrite = epread = 0;
 999                 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1000                         epd = &ifd->endpoint[e].desc;
1001
1002                         if ((epd->bmAttributes&USB_ENDPOINT_XFERTYPE_MASK)!=
1003                             USB_ENDPOINT_XFER_BULK)
1004                                 continue;
1005
1006                         if (!(epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK)) {
1007                                 if (!epwrite)
1008                                         epwrite = epd;
1009
1010                         } else {
1011                                 if (!epread)
1012                                         epread = epd;
1013                         }
1014                 }
1015
1016                 /* Ignore buggy hardware without the right endpoints. */
1017                 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1018                         continue;
1019
1020                 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1021                  * and buggy bidirectional printers. */
1022                 if (ifd->desc.bInterfaceProtocol == 1) {
1023                         epread = NULL;
1024                 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1025                         info("Disabling reads from problem bidirectional "
1026                                 "printer on usblp%d", usblp->minor);
1027                         epread = NULL;
1028                 }
1029
1030                 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1031                                 ifd->desc.bAlternateSetting;
1032                 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1033                 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1034         }
1035
1036         /* If our requested protocol is supported, then use it. */
1037         if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1038             proto_bias <= USBLP_LAST_PROTOCOL &&
1039             usblp->protocol[proto_bias].alt_setting != -1)
1040                 return proto_bias;
1041
1042         /* Ordering is important here. */
1043         if (usblp->protocol[2].alt_setting != -1)
1044                 return 2;
1045         if (usblp->protocol[1].alt_setting != -1)
1046                 return 1;
1047         if (usblp->protocol[3].alt_setting != -1)
1048                 return 3;
1049
1050         /* If nothing is available, then don't bind to this device. */
1051         return -1;
1052 }
1053
1054 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1055 {
1056         int r, alts;
1057
1058         if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1059                 return -EINVAL;
1060
1061         alts = usblp->protocol[protocol].alt_setting;
1062         if (alts < 0)
1063                 return -EINVAL;
1064         r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1065         if (r < 0) {
1066                 err("can't set desired altsetting %d on interface %d",
1067                         alts, usblp->ifnum);
1068                 return r;
1069         }
1070
1071         usb_fill_bulk_urb(usblp->writeurb, usblp->dev,
1072                 usb_sndbulkpipe(usblp->dev,
1073                   usblp->protocol[protocol].epwrite->bEndpointAddress),
1074                 usblp->writebuf, 0,
1075                 usblp_bulk_write, usblp);
1076
1077         usblp->bidir = (usblp->protocol[protocol].epread != 0);
1078         if (usblp->bidir)
1079                 usb_fill_bulk_urb(usblp->readurb, usblp->dev,
1080                         usb_rcvbulkpipe(usblp->dev,
1081                           usblp->protocol[protocol].epread->bEndpointAddress),
1082                         usblp->readbuf, USBLP_BUF_SIZE,
1083                         usblp_bulk_read, usblp);
1084
1085         usblp->current_protocol = protocol;
1086         dbg("usblp%d set protocol %d", usblp->minor, protocol);
1087         return 0;
1088 }
1089
1090 /* Retrieves and caches device ID string.
1091  * Returns length, including length bytes but not null terminator.
1092  * On error, returns a negative errno value. */
1093 static int usblp_cache_device_id_string(struct usblp *usblp)
1094 {
1095         int err, length;
1096
1097         err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1098         if (err < 0) {
1099                 dbg("usblp%d: error = %d reading IEEE-1284 Device ID string",
1100                         usblp->minor, err);
1101                 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1102                 return -EIO;
1103         }
1104
1105         /* First two bytes are length in big-endian.
1106          * They count themselves, and we copy them into
1107          * the user's buffer. */
1108         length = be16_to_cpu(*((u16 *)usblp->device_id_string));
1109         if (length < 2)
1110                 length = 2;
1111         else if (length >= USBLP_DEVICE_ID_SIZE)
1112                 length = USBLP_DEVICE_ID_SIZE - 1;
1113         usblp->device_id_string[length] = '\0';
1114
1115         dbg("usblp%d Device ID string [len=%d]=\"%s\"",
1116                 usblp->minor, length, &usblp->device_id_string[2]);
1117
1118         return length;
1119 }
1120
1121 static void usblp_disconnect(struct usb_interface *intf)
1122 {
1123         struct usblp *usblp = usb_get_intfdata (intf);
1124
1125         usb_deregister_dev(intf, &usblp_class);
1126
1127         if (!usblp || !usblp->dev) {
1128                 err("bogus disconnect");
1129                 BUG ();
1130         }
1131
1132         down (&usblp->sem);
1133         lock_kernel();
1134         usblp->present = 0;
1135         usb_set_intfdata (intf, NULL);
1136
1137         usblp_unlink_urbs(usblp);
1138
1139         if (!usblp->used)
1140                 usblp_cleanup (usblp);
1141         else    /* cleanup later, on release */
1142                 up (&usblp->sem);
1143         unlock_kernel();
1144 }
1145
1146 static struct usb_device_id usblp_ids [] = {
1147         { USB_DEVICE_INFO(7, 1, 1) },
1148         { USB_DEVICE_INFO(7, 1, 2) },
1149         { USB_DEVICE_INFO(7, 1, 3) },
1150         { USB_INTERFACE_INFO(7, 1, 1) },
1151         { USB_INTERFACE_INFO(7, 1, 2) },
1152         { USB_INTERFACE_INFO(7, 1, 3) },
1153         { }                                             /* Terminating entry */
1154 };
1155
1156 MODULE_DEVICE_TABLE (usb, usblp_ids);
1157
1158 static struct usb_driver usblp_driver = {
1159         .owner =        THIS_MODULE,
1160         .name =         "usblp",
1161         .probe =        usblp_probe,
1162         .disconnect =   usblp_disconnect,
1163         .id_table =     usblp_ids,
1164 };
1165
1166 static int __init usblp_init(void)
1167 {
1168         int retval;
1169         retval = usb_register(&usblp_driver);
1170         if (retval)
1171                 goto out;
1172         info(DRIVER_VERSION ": " DRIVER_DESC);
1173 out:
1174         return retval;
1175 }
1176
1177 static void __exit usblp_exit(void)
1178 {
1179         usb_deregister(&usblp_driver);
1180 }
1181
1182 module_init(usblp_init);
1183 module_exit(usblp_exit);
1184
1185 MODULE_AUTHOR( DRIVER_AUTHOR );
1186 MODULE_DESCRIPTION( DRIVER_DESC );
1187 MODULE_PARM(proto_bias, "i");
1188 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1189 MODULE_LICENSE("GPL");