git.oblomov.eu Git - linux-2.6/blob - 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      <rdunlap@xenotime.net>
   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  * Copyright (c) 2006 Oliver Neukum     <oliver@neukum.name>
  11  *
  12  * USB Printer Device Class driver for USB printers and printer cables
  13  *
  14  * Sponsored by SuSE
  15  *
  16  * ChangeLog:
  17  *      v0.1 - thorough cleaning, URBification, almost a rewrite
  18  *      v0.2 - some more cleanups
  19  *      v0.3 - cleaner again, waitqueue fixes
  20  *      v0.4 - fixes in unidirectional mode
  21  *      v0.5 - add DEVICE_ID string support
  22  *      v0.6 - never time out
  23  *      v0.7 - fixed bulk-IN read and poll (David Paschal)
  24  *      v0.8 - add devfs support
  25  *      v0.9 - fix unplug-while-open paths
  26  *      v0.10- remove sleep_on, fix error on oom (oliver@neukum.org)
  27  *      v0.11 - add proto_bias option (Pete Zaitcev)
  28  *      v0.12 - add hpoj.sourceforge.net ioctls (David Paschal)
  29  *      v0.13 - alloc space for statusbuf (<status> not on stack);
  30  *              use usb_buffer_alloc() for read buf & write buf;
  31  */
  32
  33 /*
  34  * This program is free software; you can redistribute it and/or modify
  35  * it under the terms of the GNU General Public License as published by
  36  * the Free Software Foundation; either version 2 of the License, or
  37  * (at your option) any later version.
  38  *
  39  * This program is distributed in the hope that it will be useful,
  40  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  41  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  42  * GNU General Public License for more details.
  43  *
  44  * You should have received a copy of the GNU General Public License
  45  * along with this program; if not, write to the Free Software
  46  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  47  */
  48
  49 #include <linux/module.h>
  50 #include <linux/kernel.h>
  51 #include <linux/sched.h>
  52 #include <linux/smp_lock.h>
  53 #include <linux/signal.h>
  54 #include <linux/poll.h>
  55 #include <linux/init.h>
  56 #include <linux/slab.h>
  57 #include <linux/lp.h>
  58 #include <linux/mutex.h>
  59 #undef DEBUG
  60 #include <linux/usb.h>
  61
  62 /*
  63  * Version Information
  64  */
  65 #define DRIVER_VERSION "v0.13"
  66 #define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal"
  67 #define DRIVER_DESC "USB Printer Device Class driver"
  68
  69 #define USBLP_BUF_SIZE          8192
  70 #define USBLP_DEVICE_ID_SIZE    1024
  71
  72 /* ioctls: */
  73 #define LPGETSTATUS             0x060b          /* same as in drivers/char/lp.c */
  74 #define IOCNR_GET_DEVICE_ID             1
  75 #define IOCNR_GET_PROTOCOLS             2
  76 #define IOCNR_SET_PROTOCOL              3
  77 #define IOCNR_HP_SET_CHANNEL            4
  78 #define IOCNR_GET_BUS_ADDRESS           5
  79 #define IOCNR_GET_VID_PID               6
  80 #define IOCNR_SOFT_RESET                7
  81 /* Get device_id string: */
  82 #define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len)
  83 /* The following ioctls were added for http://hpoj.sourceforge.net: */
  84 /* Get two-int array:
  85  * [0]=current protocol (1=7/1/1, 2=7/1/2, 3=7/1/3),
  86  * [1]=supported protocol mask (mask&(1<<n)!=0 means 7/1/n supported): */
  87 #define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
  88 /* Set protocol (arg: 1=7/1/1, 2=7/1/2, 3=7/1/3): */
  89 #define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0)
  90 /* Set channel number (HP Vendor-specific command): */
  91 #define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0)
  92 /* Get two-int array: [0]=bus number, [1]=device address: */
  93 #define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len)
  94 /* Get two-int array: [0]=vendor ID, [1]=product ID: */
  95 #define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len)
  96 /* Perform class specific soft reset */
  97 #define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0);
  98
  99 /*
 100  * A DEVICE_ID string may include the printer's serial number.
 101  * It should end with a semi-colon (';').
 102  * An example from an HP 970C DeskJet printer is (this is one long string,
 103  * with the serial number changed):
 104 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:                    ;
 105  */
 106
 107 /*
 108  * USB Printer Requests
 109  */
 110
 111 #define USBLP_REQ_GET_ID                        0x00
 112 #define USBLP_REQ_GET_STATUS                    0x01
 113 #define USBLP_REQ_RESET                         0x02
 114 #define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST     0x00    /* HP Vendor-specific */
 115
 116 #define USBLP_MINORS            16
 117 #define USBLP_MINOR_BASE        0
 118
 119 #define USBLP_WRITE_TIMEOUT     (5000)                  /* 5 seconds */
 120
 121 #define USBLP_FIRST_PROTOCOL    1
 122 #define USBLP_LAST_PROTOCOL     3
 123 #define USBLP_MAX_PROTOCOLS     (USBLP_LAST_PROTOCOL+1)
 124
 125 /*
 126  * some arbitrary status buffer size;
 127  * need a status buffer that is allocated via kmalloc(), not on stack
 128  */
 129 #define STATUS_BUF_SIZE         8
 130
 131 struct usblp {
 132         struct usb_device       *dev;                   /* USB device */
 133         struct semaphore        sem;                    /* locks this struct, especially "dev" */
 134         char                    *writebuf;              /* write transfer_buffer */
 135         char                    *readbuf;               /* read transfer_buffer */
 136         char                    *statusbuf;             /* status transfer_buffer */
 137         struct urb              *readurb, *writeurb;    /* The urbs */
 138         wait_queue_head_t       wait;                   /* Zzzzz ... */
 139         int                     readcount;              /* Counter for reads */
 140         int                     ifnum;                  /* Interface number */
 141         struct usb_interface    *intf;                  /* The interface */
 142         /* Alternate-setting numbers and endpoints for each protocol
 143          * (7/1/{index=1,2,3}) that the device supports: */
 144         struct {
 145                 int                             alt_setting;
 146                 struct usb_endpoint_descriptor  *epwrite;
 147                 struct usb_endpoint_descriptor  *epread;
 148         }                       protocol[USBLP_MAX_PROTOCOLS];
 149         int                     current_protocol;
 150         int                     minor;                  /* minor number of device */
 151         int                     wcomplete;              /* writing is completed */
 152         int                     rcomplete;              /* reading is completed */
 153         unsigned int            quirks;                 /* quirks flags */
 154         unsigned char           used;                   /* True if open */
 155         unsigned char           present;                /* True if not disconnected */
 156         unsigned char           bidir;                  /* interface is bidirectional */
 157         unsigned char           *device_id_string;      /* IEEE 1284 DEVICE ID string (ptr) */
 158                                                         /* first 2 bytes are (big-endian) length */
 159 };
 160
 161 #ifdef DEBUG
 162 static void usblp_dump(struct usblp *usblp) {
 163         int p;
 164
 165         dbg("usblp=0x%p", usblp);
 166         dbg("dev=0x%p", usblp->dev);
 167         dbg("present=%d", usblp->present);
 168         dbg("readbuf=0x%p", usblp->readbuf);
 169         dbg("writebuf=0x%p", usblp->writebuf);
 170         dbg("readurb=0x%p", usblp->readurb);
 171         dbg("writeurb=0x%p", usblp->writeurb);
 172         dbg("readcount=%d", usblp->readcount);
 173         dbg("ifnum=%d", usblp->ifnum);
 174     for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
 175         dbg("protocol[%d].alt_setting=%d", p, usblp->protocol[p].alt_setting);
 176         dbg("protocol[%d].epwrite=%p", p, usblp->protocol[p].epwrite);
 177         dbg("protocol[%d].epread=%p", p, usblp->protocol[p].epread);
 178     }
 179         dbg("current_protocol=%d", usblp->current_protocol);
 180         dbg("minor=%d", usblp->minor);
 181         dbg("wcomplete=%d", usblp->wcomplete);
 182         dbg("rcomplete=%d", usblp->rcomplete);
 183         dbg("quirks=%d", usblp->quirks);
 184         dbg("used=%d", usblp->used);
 185         dbg("bidir=%d", usblp->bidir);
 186         dbg("device_id_string=\"%s\"",
 187                 usblp->device_id_string ?
 188                         usblp->device_id_string + 2 :
 189                         (unsigned char *)"(null)");
 190 }
 191 #endif
 192
 193 /* Quirks: various printer quirks are handled by this table & its flags. */
 194
 195 struct quirk_printer_struct {
 196         __u16 vendorId;
 197         __u16 productId;
 198         unsigned int quirks;
 199 };
 200
 201 #define USBLP_QUIRK_BIDIR       0x1     /* reports bidir but requires unidirectional mode (no INs/reads) */
 202 #define USBLP_QUIRK_USB_INIT    0x2     /* needs vendor USB init string */
 203
 204 static const struct quirk_printer_struct quirk_printers[] = {
 205         { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
 206         { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
 207         { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
 208         { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
 209         { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
 210         { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
 211         { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */
 212         { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */
 213         { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
 214         { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
 215         { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
 216         { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
 217         { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
 218         { 0, 0 }
 219 };
 220
 221 static int usblp_select_alts(struct usblp *usblp);
 222 static int usblp_set_protocol(struct usblp *usblp, int protocol);
 223 static int usblp_cache_device_id_string(struct usblp *usblp);
 224
 225 /* forward reference to make our lives easier */
 226 static struct usb_driver usblp_driver;
 227 static DEFINE_MUTEX(usblp_mutex);       /* locks the existence of usblp's */
 228
 229 /*
 230  * Functions for usblp control messages.
 231  */
 232
 233 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
 234 {
 235         int retval;
 236         int index = usblp->ifnum;
 237
 238         /* High byte has the interface index.
 239            Low byte has the alternate setting.
 240          */
 241         if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) {
 242           index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
 243         }
 244
 245         retval = usb_control_msg(usblp->dev,
 246                 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
 247                 request, type | dir | recip, value, index, buf, len, USBLP_WRITE_TIMEOUT);
 248         dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d",
 249                 request, !!dir, recip, value, index, len, retval);
 250         return retval < 0 ? retval : 0;
 251 }
 252
 253 #define usblp_read_status(usblp, status)\
 254         usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
 255 #define usblp_get_id(usblp, config, id, maxlen)\
 256         usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
 257 #define usblp_reset(usblp)\
 258         usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
 259
 260 #define usblp_hp_channel_change_request(usblp, channel, buffer) \
 261         usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
 262
 263 /*
 264  * See the description for usblp_select_alts() below for the usage
 265  * explanation.  Look into your /proc/bus/usb/devices and dmesg in
 266  * case of any trouble.
 267  */
 268 static int proto_bias = -1;
 269
 270 /*
 271  * URB callback.
 272  */
 273
 274 static void usblp_bulk_read(struct urb *urb, struct pt_regs *regs)
 275 {
 276         struct usblp *usblp = urb->context;
 277
 278         if (unlikely(!usblp || !usblp->dev || !usblp->used))
 279                 return;
 280
 281         if (unlikely(!usblp->present))
 282                 goto unplug;
 283         if (unlikely(urb->status))
 284                 warn("usblp%d: nonzero read/write bulk status received: %d",
 285                         usblp->minor, urb->status);
 286         usblp->rcomplete = 1;
 287 unplug:
 288         wake_up_interruptible(&usblp->wait);
 289 }
 290
 291 static void usblp_bulk_write(struct urb *urb, struct pt_regs *regs)
 292 {
 293         struct usblp *usblp = urb->context;
 294
 295         if (unlikely(!usblp || !usblp->dev || !usblp->used))
 296                 return;
 297         if (unlikely(!usblp->present))
 298                 goto unplug;
 299         if (unlikely(urb->status))
 300                 warn("usblp%d: nonzero read/write bulk status received: %d",
 301                         usblp->minor, urb->status);
 302         usblp->wcomplete = 1;
 303 unplug:
 304         wake_up_interruptible(&usblp->wait);
 305 }
 306
 307 /*
 308  * Get and print printer errors.
 309  */
 310
 311 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
 312
 313 static int usblp_check_status(struct usblp *usblp, int err)
 314 {
 315         unsigned char status, newerr = 0;
 316         int error;
 317
 318         error = usblp_read_status (usblp, usblp->statusbuf);
 319         if (error < 0) {
 320                 if (printk_ratelimit())
 321                         err("usblp%d: error %d reading printer status",
 322                                 usblp->minor, error);
 323                 return 0;
 324         }
 325
 326         status = *usblp->statusbuf;
 327
 328         if (~status & LP_PERRORP)
 329                 newerr = 3;
 330         if (status & LP_POUTPA)
 331                 newerr = 1;
 332         if (~status & LP_PSELECD)
 333                 newerr = 2;
 334
 335         if (newerr != err)
 336                 info("usblp%d: %s", usblp->minor, usblp_messages[newerr]);
 337
 338         return newerr;
 339 }
 340
 341 /*
 342  * File op functions.
 343  */
 344
 345 static int usblp_open(struct inode *inode, struct file *file)
 346 {
 347         int minor = iminor(inode);
 348         struct usblp *usblp;
 349         struct usb_interface *intf;
 350         int retval;
 351
 352         if (minor < 0)
 353                 return -ENODEV;
 354
 355         mutex_lock (&usblp_mutex);
 356
 357         retval = -ENODEV;
 358         intf = usb_find_interface(&usblp_driver, minor);
 359         if (!intf) {
 360                 goto out;
 361         }
 362         usblp = usb_get_intfdata (intf);
 363         if (!usblp || !usblp->dev || !usblp->present)
 364                 goto out;
 365
 366         retval = -EBUSY;
 367         if (usblp->used)
 368                 goto out;
 369
 370         /*
 371          * TODO: need to implement LP_ABORTOPEN + O_NONBLOCK as in drivers/char/lp.c ???
 372          * This is #if 0-ed because we *don't* want to fail an open
 373          * just because the printer is off-line.
 374          */
 375 #if 0
 376         if ((retval = usblp_check_status(usblp, 0))) {
 377                 retval = retval > 1 ? -EIO : -ENOSPC;
 378                 goto out;
 379         }
 380 #else
 381         retval = 0;
 382 #endif
 383
 384         usblp->used = 1;
 385         file->private_data = usblp;
 386
 387         usblp->writeurb->transfer_buffer_length = 0;
 388         usblp->wcomplete = 1; /* we begin writeable */
 389         usblp->rcomplete = 0;
 390         usblp->writeurb->status = 0;
 391         usblp->readurb->status = 0;
 392
 393         if (usblp->bidir) {
 394                 usblp->readcount = 0;
 395                 usblp->readurb->dev = usblp->dev;
 396                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) {
 397                         retval = -EIO;
 398                         usblp->used = 0;
 399                         file->private_data = NULL;
 400                 }
 401         }
 402 out:
 403         mutex_unlock (&usblp_mutex);
 404         return retval;
 405 }
 406
 407 static void usblp_cleanup (struct usblp *usblp)
 408 {
 409         info("usblp%d: removed", usblp->minor);
 410
 411         kfree (usblp->device_id_string);
 412         kfree (usblp->statusbuf);
 413         usb_free_urb(usblp->writeurb);
 414         usb_free_urb(usblp->readurb);
 415         kfree (usblp);
 416 }
 417
 418 static void usblp_unlink_urbs(struct usblp *usblp)
 419 {
 420         usb_kill_urb(usblp->writeurb);
 421         if (usblp->bidir)
 422                 usb_kill_urb(usblp->readurb);
 423 }
 424
 425 static int usblp_release(struct inode *inode, struct file *file)
 426 {
 427         struct usblp *usblp = file->private_data;
 428
 429         mutex_lock (&usblp_mutex);
 430         usblp->used = 0;
 431         if (usblp->present) {
 432                 usblp_unlink_urbs(usblp);
 433         } else          /* finish cleanup from disconnect */
 434                 usblp_cleanup (usblp);
 435         mutex_unlock (&usblp_mutex);
 436         return 0;
 437 }
 438
 439 /* No kernel lock - fine */
 440 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
 441 {
 442         struct usblp *usblp = file->private_data;
 443         poll_wait(file, &usblp->wait, wait);
 444         return ((!usblp->bidir || !usblp->rcomplete) ? 0 : POLLIN  | POLLRDNORM)
 445                                | (!usblp->wcomplete ? 0 : POLLOUT | POLLWRNORM);
 446 }
 447
 448 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 449 {
 450         struct usblp *usblp = file->private_data;
 451         int length, err, i;
 452         unsigned char newChannel;
 453         int status;
 454         int twoints[2];
 455         int retval = 0;
 456
 457         down (&usblp->sem);
 458         if (!usblp->present) {
 459                 retval = -ENODEV;
 460                 goto done;
 461         }
 462
 463         dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd),
 464                 _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd) );
 465
 466         if (_IOC_TYPE(cmd) == 'P')      /* new-style ioctl number */
 467
 468                 switch (_IOC_NR(cmd)) {
 469
 470                         case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
 471                                 if (_IOC_DIR(cmd) != _IOC_READ) {
 472                                         retval = -EINVAL;
 473                                         goto done;
 474                                 }
 475
 476                                 length = usblp_cache_device_id_string(usblp);
 477                                 if (length < 0) {
 478                                         retval = length;
 479                                         goto done;
 480                                 }
 481                                 if (length > _IOC_SIZE(cmd))
 482                                         length = _IOC_SIZE(cmd); /* truncate */
 483
 484                                 if (copy_to_user((void __user *) arg,
 485                                                 usblp->device_id_string,
 486                                                 (unsigned long) length)) {
 487                                         retval = -EFAULT;
 488                                         goto done;
 489                                 }
 490
 491                                 break;
 492
 493                         case IOCNR_GET_PROTOCOLS:
 494                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 495                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 496                                         retval = -EINVAL;
 497                                         goto done;
 498                                 }
 499
 500                                 twoints[0] = usblp->current_protocol;
 501                                 twoints[1] = 0;
 502                                 for (i = USBLP_FIRST_PROTOCOL;
 503                                      i <= USBLP_LAST_PROTOCOL; i++) {
 504                                         if (usblp->protocol[i].alt_setting >= 0)
 505                                                 twoints[1] |= (1<<i);
 506                                 }
 507
 508                                 if (copy_to_user((void __user *)arg,
 509                                                 (unsigned char *)twoints,
 510                                                 sizeof(twoints))) {
 511                                         retval = -EFAULT;
 512                                         goto done;
 513                                 }
 514
 515                                 break;
 516
 517                         case IOCNR_SET_PROTOCOL:
 518                                 if (_IOC_DIR(cmd) != _IOC_WRITE) {
 519                                         retval = -EINVAL;
 520                                         goto done;
 521                                 }
 522
 523 #ifdef DEBUG
 524                                 if (arg == -10) {
 525                                         usblp_dump(usblp);
 526                                         break;
 527                                 }
 528 #endif
 529
 530                                 usblp_unlink_urbs(usblp);
 531                                 retval = usblp_set_protocol(usblp, arg);
 532                                 if (retval < 0) {
 533                                         usblp_set_protocol(usblp,
 534                                                 usblp->current_protocol);
 535                                 }
 536                                 break;
 537
 538                         case IOCNR_HP_SET_CHANNEL:
 539                                 if (_IOC_DIR(cmd) != _IOC_WRITE ||
 540                                     le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
 541                                     usblp->quirks & USBLP_QUIRK_BIDIR) {
 542                                         retval = -EINVAL;
 543                                         goto done;
 544                                 }
 545
 546                                 err = usblp_hp_channel_change_request(usblp,
 547                                         arg, &newChannel);
 548                                 if (err < 0) {
 549                                         err("usblp%d: error = %d setting "
 550                                                 "HP channel",
 551                                                 usblp->minor, err);
 552                                         retval = -EIO;
 553                                         goto done;
 554                                 }
 555
 556                                 dbg("usblp%d requested/got HP channel %ld/%d",
 557                                         usblp->minor, arg, newChannel);
 558                                 break;
 559
 560                         case IOCNR_GET_BUS_ADDRESS:
 561                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 562                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 563                                         retval = -EINVAL;
 564                                         goto done;
 565                                 }
 566
 567                                 twoints[0] = usblp->dev->bus->busnum;
 568                                 twoints[1] = usblp->dev->devnum;
 569                                 if (copy_to_user((void __user *)arg,
 570                                                 (unsigned char *)twoints,
 571                                                 sizeof(twoints))) {
 572                                         retval = -EFAULT;
 573                                         goto done;
 574                                 }
 575
 576                                 dbg("usblp%d is bus=%d, device=%d",
 577                                         usblp->minor, twoints[0], twoints[1]);
 578                                 break;
 579
 580                         case IOCNR_GET_VID_PID:
 581                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 582                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 583                                         retval = -EINVAL;
 584                                         goto done;
 585                                 }
 586
 587                                 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
 588                                 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
 589                                 if (copy_to_user((void __user *)arg,
 590                                                 (unsigned char *)twoints,
 591                                                 sizeof(twoints))) {
 592                                         retval = -EFAULT;
 593                                         goto done;
 594                                 }
 595
 596                                 dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X",
 597                                         usblp->minor, twoints[0], twoints[1]);
 598                                 break;
 599
 600                         case IOCNR_SOFT_RESET:
 601                                 if (_IOC_DIR(cmd) != _IOC_NONE) {
 602                                         retval = -EINVAL;
 603                                         goto done;
 604                                 }
 605                                 retval = usblp_reset(usblp);
 606                                 break;
 607                         default:
 608                                 retval = -ENOTTY;
 609                 }
 610         else    /* old-style ioctl value */
 611                 switch (cmd) {
 612
 613                         case LPGETSTATUS:
 614                                 if (usblp_read_status(usblp, usblp->statusbuf)) {
 615                                         if (printk_ratelimit())
 616                                                 err("usblp%d: failed reading printer status",
 617                                                         usblp->minor);
 618                                         retval = -EIO;
 619                                         goto done;
 620                                 }
 621                                 status = *usblp->statusbuf;
 622                                 if (copy_to_user ((void __user *)arg, &status, sizeof(int)))
 623                                         retval = -EFAULT;
 624                                 break;
 625
 626                         default:
 627                                 retval = -ENOTTY;
 628                 }
 629
 630 done:
 631         up (&usblp->sem);
 632         return retval;
 633 }
 634
 635 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 636 {
 637         struct usblp *usblp = file->private_data;
 638         int timeout, rv, err = 0, transfer_length = 0;
 639         size_t writecount = 0;
 640
 641         while (writecount < count) {
 642                 if (!usblp->wcomplete) {
 643                         barrier();
 644                         if (file->f_flags & O_NONBLOCK) {
 645                                 writecount += transfer_length;
 646                                 return writecount ? writecount : -EAGAIN;
 647                         }
 648
 649                         timeout = USBLP_WRITE_TIMEOUT;
 650
 651                         rv = wait_event_interruptible_timeout(usblp->wait, usblp->wcomplete || !usblp->present , timeout);
 652                         if (rv < 0)
 653                                 return writecount ? writecount : -EINTR;
 654                 }
 655                 down (&usblp->sem);
 656                 if (!usblp->present) {
 657                         up (&usblp->sem);
 658                         return -ENODEV;
 659                 }
 660
 661                 if (usblp->writeurb->status != 0) {
 662                         if (usblp->quirks & USBLP_QUIRK_BIDIR) {
 663                                 if (!usblp->wcomplete)
 664                                         err("usblp%d: error %d writing to printer",
 665                                                 usblp->minor, usblp->writeurb->status);
 666                                 err = usblp->writeurb->status;
 667                         } else
 668                                 err = usblp_check_status(usblp, err);
 669                         up (&usblp->sem);
 670
 671                         /* if the fault was due to disconnect, let khubd's
 672                          * call to usblp_disconnect() grab usblp->sem ...
 673                          */
 674                         schedule ();
 675                         continue;
 676                 }
 677
 678                 /* We must increment writecount here, and not at the
 679                  * end of the loop. Otherwise, the final loop iteration may
 680                  * be skipped, leading to incomplete printer output.
 681                  */
 682                 writecount += transfer_length;
 683                 if (writecount == count) {
 684                         up(&usblp->sem);
 685                         break;
 686                 }
 687
 688                 transfer_length=(count - writecount);
 689                 if (transfer_length > USBLP_BUF_SIZE)
 690                         transfer_length = USBLP_BUF_SIZE;
 691
 692                 usblp->writeurb->transfer_buffer_length = transfer_length;
 693
 694                 if (copy_from_user(usblp->writeurb->transfer_buffer,
 695                                    buffer + writecount, transfer_length)) {
 696                         up(&usblp->sem);
 697                         return writecount ? writecount : -EFAULT;
 698                 }
 699
 700                 usblp->writeurb->dev = usblp->dev;
 701                 usblp->wcomplete = 0;
 702                 err = usb_submit_urb(usblp->writeurb, GFP_KERNEL);
 703                 if (err) {
 704                         if (err != -ENOMEM)
 705                                 count = -EIO;
 706                         else
 707                                 count = writecount ? writecount : -ENOMEM;
 708                         up (&usblp->sem);
 709                         break;
 710                 }
 711                 up (&usblp->sem);
 712         }
 713
 714         return count;
 715 }
 716
 717 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 718 {
 719         struct usblp *usblp = file->private_data;
 720         int rv;
 721
 722         if (!usblp->bidir)
 723                 return -EINVAL;
 724
 725         down (&usblp->sem);
 726         if (!usblp->present) {
 727                 count = -ENODEV;
 728                 goto done;
 729         }
 730
 731         if (!usblp->rcomplete) {
 732                 barrier();
 733
 734                 if (file->f_flags & O_NONBLOCK) {
 735                         count = -EAGAIN;
 736                         goto done;
 737                 }
 738                 up(&usblp->sem);
 739                 rv = wait_event_interruptible(usblp->wait, usblp->rcomplete || !usblp->present);
 740                 down(&usblp->sem);
 741                 if (rv < 0) {
 742                         count = -EINTR;
 743                         goto done;
 744                 }
 745         }
 746
 747         if (!usblp->present) {
 748                 count = -ENODEV;
 749                 goto done;
 750         }
 751
 752         if (usblp->readurb->status) {
 753                 err("usblp%d: error %d reading from printer",
 754                         usblp->minor, usblp->readurb->status);
 755                 usblp->readurb->dev = usblp->dev;
 756                 usblp->readcount = 0;
 757                 usblp->rcomplete = 0;
 758                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0)
 759                         dbg("error submitting urb");
 760                 count = -EIO;
 761                 goto done;
 762         }
 763
 764         count = count < usblp->readurb->actual_length - usblp->readcount ?
 765                 count : usblp->readurb->actual_length - usblp->readcount;
 766
 767         if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) {
 768                 count = -EFAULT;
 769                 goto done;
 770         }
 771
 772         if ((usblp->readcount += count) == usblp->readurb->actual_length) {
 773                 usblp->readcount = 0;
 774                 usblp->readurb->dev = usblp->dev;
 775                 usblp->rcomplete = 0;
 776                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL)) {
 777                         count = -EIO;
 778                         goto done;
 779                 }
 780         }
 781
 782 done:
 783         up (&usblp->sem);
 784         return count;
 785 }
 786
 787 /*
 788  * Checks for printers that have quirks, such as requiring unidirectional
 789  * communication but reporting bidirectional; currently some HP printers
 790  * have this flaw (HP 810, 880, 895, etc.), or needing an init string
 791  * sent at each open (like some Epsons).
 792  * Returns 1 if found, 0 if not found.
 793  *
 794  * HP recommended that we use the bidirectional interface but
 795  * don't attempt any bulk IN transfers from the IN endpoint.
 796  * Here's some more detail on the problem:
 797  * The problem is not that it isn't bidirectional though. The problem
 798  * is that if you request a device ID, or status information, while
 799  * the buffers are full, the return data will end up in the print data
 800  * buffer. For example if you make sure you never request the device ID
 801  * while you are sending print data, and you don't try to query the
 802  * printer status every couple of milliseconds, you will probably be OK.
 803  */
 804 static unsigned int usblp_quirks (__u16 vendor, __u16 product)
 805 {
 806         int i;
 807
 808         for (i = 0; quirk_printers[i].vendorId; i++) {
 809                 if (vendor == quirk_printers[i].vendorId &&
 810                     product == quirk_printers[i].productId)
 811                         return quirk_printers[i].quirks;
 812         }
 813         return 0;
 814 }
 815
 816 static struct file_operations usblp_fops = {
 817         .owner =        THIS_MODULE,
 818         .read =         usblp_read,
 819         .write =        usblp_write,
 820         .poll =         usblp_poll,
 821         .unlocked_ioctl =       usblp_ioctl,
 822         .compat_ioctl =         usblp_ioctl,
 823         .open =         usblp_open,
 824         .release =      usblp_release,
 825 };
 826
 827 static struct usb_class_driver usblp_class = {
 828         .name =         "lp%d",
 829         .fops =         &usblp_fops,
 830         .minor_base =   USBLP_MINOR_BASE,
 831 };
 832
 833 static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf)
 834 {
 835         struct usb_interface *intf = to_usb_interface(dev);
 836         struct usblp *usblp = usb_get_intfdata (intf);
 837
 838         if (usblp->device_id_string[0] == 0 &&
 839             usblp->device_id_string[1] == 0)
 840                 return 0;
 841
 842         return sprintf(buf, "%s", usblp->device_id_string+2);
 843 }
 844
 845 static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL);
 846
 847 static int usblp_probe(struct usb_interface *intf,
 848                        const struct usb_device_id *id)
 849 {
 850         struct usb_device *dev = interface_to_usbdev (intf);
 851         struct usblp *usblp = NULL;
 852         int protocol;
 853         int retval;
 854
 855         /* Malloc and start initializing usblp structure so we can use it
 856          * directly. */
 857         if (!(usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL))) {
 858                 err("out of memory for usblp");
 859                 goto abort;
 860         }
 861         usblp->dev = dev;
 862         init_MUTEX (&usblp->sem);
 863         init_waitqueue_head(&usblp->wait);
 864         usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
 865         usblp->intf = intf;
 866
 867         usblp->writeurb = usb_alloc_urb(0, GFP_KERNEL);
 868         if (!usblp->writeurb) {
 869                 err("out of memory");
 870                 goto abort;
 871         }
 872         usblp->readurb = usb_alloc_urb(0, GFP_KERNEL);
 873         if (!usblp->readurb) {
 874                 err("out of memory");
 875                 goto abort;
 876         }
 877
 878         /* Malloc device ID string buffer to the largest expected length,
 879          * since we can re-query it on an ioctl and a dynamic string
 880          * could change in length. */
 881         if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
 882                 err("out of memory for device_id_string");
 883                 goto abort;
 884         }
 885
 886         usblp->writebuf = usblp->readbuf = NULL;
 887         usblp->writeurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 888         usblp->readurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 889         /* Malloc write & read buffers.  We somewhat wastefully
 890          * malloc both regardless of bidirectionality, because the
 891          * alternate setting can be changed later via an ioctl. */
 892         if (!(usblp->writebuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
 893                                 GFP_KERNEL, &usblp->writeurb->transfer_dma))) {
 894                 err("out of memory for write buf");
 895                 goto abort;
 896         }
 897         if (!(usblp->readbuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
 898                                 GFP_KERNEL, &usblp->readurb->transfer_dma))) {
 899                 err("out of memory for read buf");
 900                 goto abort;
 901         }
 902
 903         /* Allocate buffer for printer status */
 904         usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
 905         if (!usblp->statusbuf) {
 906                 err("out of memory for statusbuf");
 907                 goto abort;
 908         }
 909
 910         /* Lookup quirks for this printer. */
 911         usblp->quirks = usblp_quirks(
 912                 le16_to_cpu(dev->descriptor.idVendor),
 913                 le16_to_cpu(dev->descriptor.idProduct));
 914
 915         /* Analyze and pick initial alternate settings and endpoints. */
 916         protocol = usblp_select_alts(usblp);
 917         if (protocol < 0) {
 918                 dbg("incompatible printer-class device 0x%4.4X/0x%4.4X",
 919                         le16_to_cpu(dev->descriptor.idVendor),
 920                         le16_to_cpu(dev->descriptor.idProduct));
 921                 goto abort;
 922         }
 923
 924         /* Setup the selected alternate setting and endpoints. */
 925         if (usblp_set_protocol(usblp, protocol) < 0)
 926                 goto abort;
 927
 928         /* Retrieve and store the device ID string. */
 929         usblp_cache_device_id_string(usblp);
 930         device_create_file(&intf->dev, &dev_attr_ieee1284_id);
 931
 932 #ifdef DEBUG
 933         usblp_check_status(usblp, 0);
 934 #endif
 935
 936         usb_set_intfdata (intf, usblp);
 937
 938         usblp->present = 1;
 939
 940         retval = usb_register_dev(intf, &usblp_class);
 941         if (retval) {
 942                 err("Not able to get a minor for this device.");
 943                 goto abort_intfdata;
 944         }
 945         usblp->minor = intf->minor;
 946         info("usblp%d: USB %sdirectional printer dev %d "
 947                 "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X",
 948                 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
 949                 usblp->ifnum,
 950                 usblp->protocol[usblp->current_protocol].alt_setting,
 951                 usblp->current_protocol,
 952                 le16_to_cpu(usblp->dev->descriptor.idVendor),
 953                 le16_to_cpu(usblp->dev->descriptor.idProduct));
 954
 955         return 0;
 956
 957 abort_intfdata:
 958         usb_set_intfdata (intf, NULL);
 959         device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
 960 abort:
 961         if (usblp) {
 962                 if (usblp->writebuf)
 963                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 964                                 usblp->writebuf, usblp->writeurb->transfer_dma);
 965                 if (usblp->readbuf)
 966                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 967                                 usblp->readbuf, usblp->writeurb->transfer_dma);
 968                 kfree(usblp->statusbuf);
 969                 kfree(usblp->device_id_string);
 970                 usb_free_urb(usblp->writeurb);
 971                 usb_free_urb(usblp->readurb);
 972                 kfree(usblp);
 973         }
 974         return -EIO;
 975 }
 976
 977 /*
 978  * We are a "new" style driver with usb_device_id table,
 979  * but our requirements are too intricate for simple match to handle.
 980  *
 981  * The "proto_bias" option may be used to specify the preferred protocol
 982  * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3).  If the device
 983  * supports the preferred protocol, then we bind to it.
 984  *
 985  * The best interface for us is 7/1/2, because it is compatible
 986  * with a stream of characters. If we find it, we bind to it.
 987  *
 988  * Note that the people from hpoj.sourceforge.net need to be able to
 989  * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
 990  *
 991  * Failing 7/1/2, we look for 7/1/3, even though it's probably not
 992  * stream-compatible, because this matches the behaviour of the old code.
 993  *
 994  * If nothing else, we bind to 7/1/1 - the unidirectional interface.
 995  */
 996 static int usblp_select_alts(struct usblp *usblp)
 997 {
 998         struct usb_interface *if_alt;
 999         struct usb_host_interface *ifd;
1000         struct usb_endpoint_descriptor *epd, *epwrite, *epread;
1001         int p, i, e;
1002
1003         if_alt = usblp->intf;
1004
1005         for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1006                 usblp->protocol[p].alt_setting = -1;
1007
1008         /* Find out what we have. */
1009         for (i = 0; i < if_alt->num_altsetting; i++) {
1010                 ifd = &if_alt->altsetting[i];
1011
1012                 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
1013                         continue;
1014
1015                 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1016                     ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1017                         continue;
1018
1019                 /* Look for bulk OUT and IN endpoints. */
1020                 epwrite = epread = NULL;
1021                 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1022                         epd = &ifd->endpoint[e].desc;
1023
1024                         if ((epd->bmAttributes&USB_ENDPOINT_XFERTYPE_MASK)!=
1025                             USB_ENDPOINT_XFER_BULK)
1026                                 continue;
1027
1028                         if (!(epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK)) {
1029                                 if (!epwrite)
1030                                         epwrite = epd;
1031
1032                         } else {
1033                                 if (!epread)
1034                                         epread = epd;
1035                         }
1036                 }
1037
1038                 /* Ignore buggy hardware without the right endpoints. */
1039                 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1040                         continue;
1041
1042                 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1043                  * and buggy bidirectional printers. */
1044                 if (ifd->desc.bInterfaceProtocol == 1) {
1045                         epread = NULL;
1046                 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1047                         info("Disabling reads from problem bidirectional "
1048                                 "printer on usblp%d", usblp->minor);
1049                         epread = NULL;
1050                 }
1051
1052                 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1053                                 ifd->desc.bAlternateSetting;
1054                 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1055                 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1056         }
1057
1058         /* If our requested protocol is supported, then use it. */
1059         if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1060             proto_bias <= USBLP_LAST_PROTOCOL &&
1061             usblp->protocol[proto_bias].alt_setting != -1)
1062                 return proto_bias;
1063
1064         /* Ordering is important here. */
1065         if (usblp->protocol[2].alt_setting != -1)
1066                 return 2;
1067         if (usblp->protocol[1].alt_setting != -1)
1068                 return 1;
1069         if (usblp->protocol[3].alt_setting != -1)
1070                 return 3;
1071
1072         /* If nothing is available, then don't bind to this device. */
1073         return -1;
1074 }
1075
1076 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1077 {
1078         int r, alts;
1079
1080         if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1081                 return -EINVAL;
1082
1083         alts = usblp->protocol[protocol].alt_setting;
1084         if (alts < 0)
1085                 return -EINVAL;
1086         r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1087         if (r < 0) {
1088                 err("can't set desired altsetting %d on interface %d",
1089                         alts, usblp->ifnum);
1090                 return r;
1091         }
1092
1093         usb_fill_bulk_urb(usblp->writeurb, usblp->dev,
1094                 usb_sndbulkpipe(usblp->dev,
1095                   usblp->protocol[protocol].epwrite->bEndpointAddress),
1096                 usblp->writebuf, 0,
1097                 usblp_bulk_write, usblp);
1098
1099         usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1100         if (usblp->bidir)
1101                 usb_fill_bulk_urb(usblp->readurb, usblp->dev,
1102                         usb_rcvbulkpipe(usblp->dev,
1103                           usblp->protocol[protocol].epread->bEndpointAddress),
1104                         usblp->readbuf, USBLP_BUF_SIZE,
1105                         usblp_bulk_read, usblp);
1106
1107         usblp->current_protocol = protocol;
1108         dbg("usblp%d set protocol %d", usblp->minor, protocol);
1109         return 0;
1110 }
1111
1112 /* Retrieves and caches device ID string.
1113  * Returns length, including length bytes but not null terminator.
1114  * On error, returns a negative errno value. */
1115 static int usblp_cache_device_id_string(struct usblp *usblp)
1116 {
1117         int err, length;
1118
1119         err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1120         if (err < 0) {
1121                 dbg("usblp%d: error = %d reading IEEE-1284 Device ID string",
1122                         usblp->minor, err);
1123                 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1124                 return -EIO;
1125         }
1126
1127         /* First two bytes are length in big-endian.
1128          * They count themselves, and we copy them into
1129          * the user's buffer. */
1130         length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1131         if (length < 2)
1132                 length = 2;
1133         else if (length >= USBLP_DEVICE_ID_SIZE)
1134                 length = USBLP_DEVICE_ID_SIZE - 1;
1135         usblp->device_id_string[length] = '\0';
1136
1137         dbg("usblp%d Device ID string [len=%d]=\"%s\"",
1138                 usblp->minor, length, &usblp->device_id_string[2]);
1139
1140         return length;
1141 }
1142
1143 static void usblp_disconnect(struct usb_interface *intf)
1144 {
1145         struct usblp *usblp = usb_get_intfdata (intf);
1146
1147         usb_deregister_dev(intf, &usblp_class);
1148
1149         if (!usblp || !usblp->dev) {
1150                 err("bogus disconnect");
1151                 BUG ();
1152         }
1153
1154         device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1155
1156         mutex_lock (&usblp_mutex);
1157         down (&usblp->sem);
1158         usblp->present = 0;
1159         usb_set_intfdata (intf, NULL);
1160
1161         usblp_unlink_urbs(usblp);
1162         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1163                         usblp->writebuf, usblp->writeurb->transfer_dma);
1164         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1165                         usblp->readbuf, usblp->readurb->transfer_dma);
1166         up (&usblp->sem);
1167
1168         if (!usblp->used)
1169                 usblp_cleanup (usblp);
1170         mutex_unlock (&usblp_mutex);
1171 }
1172
1173 static struct usb_device_id usblp_ids [] = {
1174         { USB_DEVICE_INFO(7, 1, 1) },
1175         { USB_DEVICE_INFO(7, 1, 2) },
1176         { USB_DEVICE_INFO(7, 1, 3) },
1177         { USB_INTERFACE_INFO(7, 1, 1) },
1178         { USB_INTERFACE_INFO(7, 1, 2) },
1179         { USB_INTERFACE_INFO(7, 1, 3) },
1180         { }                                             /* Terminating entry */
1181 };
1182
1183 MODULE_DEVICE_TABLE (usb, usblp_ids);
1184
1185 static struct usb_driver usblp_driver = {
1186         .name =         "usblp",
1187         .probe =        usblp_probe,
1188         .disconnect =   usblp_disconnect,
1189         .id_table =     usblp_ids,
1190 };
1191
1192 static int __init usblp_init(void)
1193 {
1194         int retval;
1195         retval = usb_register(&usblp_driver);
1196         if (!retval)
1197                 info(DRIVER_VERSION ": " DRIVER_DESC);
1198
1199         return retval;
1200 }
1201
1202 static void __exit usblp_exit(void)
1203 {
1204         usb_deregister(&usblp_driver);
1205 }
1206
1207 module_init(usblp_init);
1208 module_exit(usblp_exit);
1209
1210 MODULE_AUTHOR( DRIVER_AUTHOR );
1211 MODULE_DESCRIPTION( DRIVER_DESC );
1212 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1213 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1214 MODULE_LICENSE("GPL");