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      <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 #define IOCNR_SOFT_RESET                7
  79 /* Get device_id string: */
  80 #define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len)
  81 /* The following ioctls were added for http://hpoj.sourceforge.net: */
  82 /* Get two-int array:
  83  * [0]=current protocol (1=7/1/1, 2=7/1/2, 3=7/1/3),
  84  * [1]=supported protocol mask (mask&(1<<n)!=0 means 7/1/n supported): */
  85 #define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
  86 /* Set protocol (arg: 1=7/1/1, 2=7/1/2, 3=7/1/3): */
  87 #define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0)
  88 /* Set channel number (HP Vendor-specific command): */
  89 #define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0)
  90 /* Get two-int array: [0]=bus number, [1]=device address: */
  91 #define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len)
  92 /* Get two-int array: [0]=vendor ID, [1]=product ID: */
  93 #define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len)
  94 /* Perform class specific soft reset */
  95 #define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0);
  96
  97 /*
  98  * A DEVICE_ID string may include the printer's serial number.
  99  * It should end with a semi-colon (';').
 100  * An example from an HP 970C DeskJet printer is (this is one long string,
 101  * with the serial number changed):
 102 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:                    ;
 103  */
 104
 105 /*
 106  * USB Printer Requests
 107  */
 108
 109 #define USBLP_REQ_GET_ID                        0x00
 110 #define USBLP_REQ_GET_STATUS                    0x01
 111 #define USBLP_REQ_RESET                         0x02
 112 #define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST     0x00    /* HP Vendor-specific */
 113
 114 #define USBLP_MINORS            16
 115 #define USBLP_MINOR_BASE        0
 116
 117 #define USBLP_WRITE_TIMEOUT     (5000)                  /* 5 seconds */
 118
 119 #define USBLP_FIRST_PROTOCOL    1
 120 #define USBLP_LAST_PROTOCOL     3
 121 #define USBLP_MAX_PROTOCOLS     (USBLP_LAST_PROTOCOL+1)
 122
 123 /*
 124  * some arbitrary status buffer size;
 125  * need a status buffer that is allocated via kmalloc(), not on stack
 126  */
 127 #define STATUS_BUF_SIZE         8
 128
 129 struct usblp {
 130         struct usb_device       *dev;                   /* USB device */
 131         struct semaphore        sem;                    /* locks this struct, especially "dev" */
 132         char                    *writebuf;              /* write transfer_buffer */
 133         char                    *readbuf;               /* read transfer_buffer */
 134         char                    *statusbuf;             /* status transfer_buffer */
 135         struct urb              *readurb, *writeurb;    /* The urbs */
 136         wait_queue_head_t       wait;                   /* Zzzzz ... */
 137         int                     readcount;              /* Counter for reads */
 138         int                     ifnum;                  /* Interface number */
 139         struct usb_interface    *intf;                  /* The interface */
 140         /* Alternate-setting numbers and endpoints for each protocol
 141          * (7/1/{index=1,2,3}) that the device supports: */
 142         struct {
 143                 int                             alt_setting;
 144                 struct usb_endpoint_descriptor  *epwrite;
 145                 struct usb_endpoint_descriptor  *epread;
 146         }                       protocol[USBLP_MAX_PROTOCOLS];
 147         int                     current_protocol;
 148         int                     minor;                  /* minor number of device */
 149         int                     wcomplete;              /* writing is completed */
 150         int                     rcomplete;              /* reading is completed */
 151         unsigned int            quirks;                 /* quirks flags */
 152         unsigned char           used;                   /* True if open */
 153         unsigned char           present;                /* True if not disconnected */
 154         unsigned char           bidir;                  /* interface is bidirectional */
 155         unsigned char           *device_id_string;      /* IEEE 1284 DEVICE ID string (ptr) */
 156                                                         /* first 2 bytes are (big-endian) length */
 157 };
 158
 159 #ifdef DEBUG
 160 static void usblp_dump(struct usblp *usblp) {
 161         int p;
 162
 163         dbg("usblp=0x%p", usblp);
 164         dbg("dev=0x%p", usblp->dev);
 165         dbg("present=%d", usblp->present);
 166         dbg("readbuf=0x%p", usblp->readbuf);
 167         dbg("writebuf=0x%p", usblp->writebuf);
 168         dbg("readurb=0x%p", usblp->readurb);
 169         dbg("writeurb=0x%p", usblp->writeurb);
 170         dbg("readcount=%d", usblp->readcount);
 171         dbg("ifnum=%d", usblp->ifnum);
 172     for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
 173         dbg("protocol[%d].alt_setting=%d", p, usblp->protocol[p].alt_setting);
 174         dbg("protocol[%d].epwrite=%p", p, usblp->protocol[p].epwrite);
 175         dbg("protocol[%d].epread=%p", p, usblp->protocol[p].epread);
 176     }
 177         dbg("current_protocol=%d", usblp->current_protocol);
 178         dbg("minor=%d", usblp->minor);
 179         dbg("wcomplete=%d", usblp->wcomplete);
 180         dbg("rcomplete=%d", usblp->rcomplete);
 181         dbg("quirks=%d", usblp->quirks);
 182         dbg("used=%d", usblp->used);
 183         dbg("bidir=%d", usblp->bidir);
 184         dbg("device_id_string=\"%s\"",
 185                 usblp->device_id_string ?
 186                         usblp->device_id_string + 2 :
 187                         (unsigned char *)"(null)");
 188 }
 189 #endif
 190
 191 /* Quirks: various printer quirks are handled by this table & its flags. */
 192
 193 struct quirk_printer_struct {
 194         __u16 vendorId;
 195         __u16 productId;
 196         unsigned int quirks;
 197 };
 198
 199 #define USBLP_QUIRK_BIDIR       0x1     /* reports bidir but requires unidirectional mode (no INs/reads) */
 200 #define USBLP_QUIRK_USB_INIT    0x2     /* needs vendor USB init string */
 201
 202 static struct quirk_printer_struct quirk_printers[] = {
 203         { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
 204         { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
 205         { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
 206         { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
 207         { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
 208         { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
 209         { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */
 210         { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */
 211         { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
 212         { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
 213         { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
 214         { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
 215         { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
 216         { 0, 0 }
 217 };
 218
 219 static int usblp_select_alts(struct usblp *usblp);
 220 static int usblp_set_protocol(struct usblp *usblp, int protocol);
 221 static int usblp_cache_device_id_string(struct usblp *usblp);
 222
 223 /* forward reference to make our lives easier */
 224 static struct usb_driver usblp_driver;
 225 static DECLARE_MUTEX(usblp_sem);        /* locks the existence of usblp's */
 226
 227 /*
 228  * Functions for usblp control messages.
 229  */
 230
 231 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
 232 {
 233         int retval;
 234         int index = usblp->ifnum;
 235
 236         /* High byte has the interface index.
 237            Low byte has the alternate setting.
 238          */
 239         if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) {
 240           index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
 241         }
 242
 243         retval = usb_control_msg(usblp->dev,
 244                 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
 245                 request, type | dir | recip, value, index, buf, len, USBLP_WRITE_TIMEOUT);
 246         dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d",
 247                 request, !!dir, recip, value, index, len, retval);
 248         return retval < 0 ? retval : 0;
 249 }
 250
 251 #define usblp_read_status(usblp, status)\
 252         usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
 253 #define usblp_get_id(usblp, config, id, maxlen)\
 254         usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
 255 #define usblp_reset(usblp)\
 256         usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
 257
 258 #define usblp_hp_channel_change_request(usblp, channel, buffer) \
 259         usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
 260
 261 /*
 262  * See the description for usblp_select_alts() below for the usage
 263  * explanation.  Look into your /proc/bus/usb/devices and dmesg in
 264  * case of any trouble.
 265  */
 266 static int proto_bias = -1;
 267
 268 /*
 269  * URB callback.
 270  */
 271
 272 static void usblp_bulk_read(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->rcomplete = 1;
 283         wake_up_interruptible(&usblp->wait);
 284 }
 285
 286 static void usblp_bulk_write(struct urb *urb, struct pt_regs *regs)
 287 {
 288         struct usblp *usblp = urb->context;
 289
 290         if (!usblp || !usblp->dev || !usblp->used || !usblp->present)
 291                 return;
 292
 293         if (unlikely(urb->status))
 294                 warn("usblp%d: nonzero read/write bulk status received: %d",
 295                         usblp->minor, urb->status);
 296         usblp->wcomplete = 1;
 297         wake_up_interruptible(&usblp->wait);
 298 }
 299
 300 /*
 301  * Get and print printer errors.
 302  */
 303
 304 static char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
 305
 306 static int usblp_check_status(struct usblp *usblp, int err)
 307 {
 308         unsigned char status, newerr = 0;
 309         int error;
 310
 311         error = usblp_read_status (usblp, usblp->statusbuf);
 312         if (error < 0) {
 313                 err("usblp%d: error %d reading printer status",
 314                         usblp->minor, error);
 315                 return 0;
 316         }
 317
 318         status = *usblp->statusbuf;
 319
 320         if (~status & LP_PERRORP)
 321                 newerr = 3;
 322         if (status & LP_POUTPA)
 323                 newerr = 1;
 324         if (~status & LP_PSELECD)
 325                 newerr = 2;
 326
 327         if (newerr != err)
 328                 info("usblp%d: %s", usblp->minor, usblp_messages[newerr]);
 329
 330         return newerr;
 331 }
 332
 333 /*
 334  * File op functions.
 335  */
 336
 337 static int usblp_open(struct inode *inode, struct file *file)
 338 {
 339         int minor = iminor(inode);
 340         struct usblp *usblp;
 341         struct usb_interface *intf;
 342         int retval;
 343
 344         if (minor < 0)
 345                 return -ENODEV;
 346
 347         down (&usblp_sem);
 348
 349         retval = -ENODEV;
 350         intf = usb_find_interface(&usblp_driver, minor);
 351         if (!intf) {
 352                 goto out;
 353         }
 354         usblp = usb_get_intfdata (intf);
 355         if (!usblp || !usblp->dev || !usblp->present)
 356                 goto out;
 357
 358         retval = -EBUSY;
 359         if (usblp->used)
 360                 goto out;
 361
 362         /*
 363          * TODO: need to implement LP_ABORTOPEN + O_NONBLOCK as in drivers/char/lp.c ???
 364          * This is #if 0-ed because we *don't* want to fail an open
 365          * just because the printer is off-line.
 366          */
 367 #if 0
 368         if ((retval = usblp_check_status(usblp, 0))) {
 369                 retval = retval > 1 ? -EIO : -ENOSPC;
 370                 goto out;
 371         }
 372 #else
 373         retval = 0;
 374 #endif
 375
 376         usblp->used = 1;
 377         file->private_data = usblp;
 378
 379         usblp->writeurb->transfer_buffer_length = 0;
 380         usblp->wcomplete = 1; /* we begin writeable */
 381         usblp->rcomplete = 0;
 382         usblp->writeurb->status = 0;
 383         usblp->readurb->status = 0;
 384
 385         if (usblp->bidir) {
 386                 usblp->readcount = 0;
 387                 usblp->readurb->dev = usblp->dev;
 388                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) {
 389                         retval = -EIO;
 390                         usblp->used = 0;
 391                         file->private_data = NULL;
 392                 }
 393         }
 394 out:
 395         up (&usblp_sem);
 396         return retval;
 397 }
 398
 399 static void usblp_cleanup (struct usblp *usblp)
 400 {
 401         info("usblp%d: removed", usblp->minor);
 402
 403         kfree (usblp->device_id_string);
 404         kfree (usblp->statusbuf);
 405         usb_free_urb(usblp->writeurb);
 406         usb_free_urb(usblp->readurb);
 407         kfree (usblp);
 408 }
 409
 410 static void usblp_unlink_urbs(struct usblp *usblp)
 411 {
 412         usb_kill_urb(usblp->writeurb);
 413         if (usblp->bidir)
 414                 usb_kill_urb(usblp->readurb);
 415 }
 416
 417 static int usblp_release(struct inode *inode, struct file *file)
 418 {
 419         struct usblp *usblp = file->private_data;
 420
 421         down (&usblp_sem);
 422         usblp->used = 0;
 423         if (usblp->present) {
 424                 usblp_unlink_urbs(usblp);
 425         } else          /* finish cleanup from disconnect */
 426                 usblp_cleanup (usblp);
 427         up (&usblp_sem);
 428         return 0;
 429 }
 430
 431 /* No kernel lock - fine */
 432 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
 433 {
 434         struct usblp *usblp = file->private_data;
 435         poll_wait(file, &usblp->wait, wait);
 436         return ((!usblp->bidir || !usblp->rcomplete) ? 0 : POLLIN  | POLLRDNORM)
 437                                | (!usblp->wcomplete ? 0 : POLLOUT | POLLWRNORM);
 438 }
 439
 440 static int usblp_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 441 {
 442         struct usblp *usblp = file->private_data;
 443         int length, err, i;
 444         unsigned char newChannel;
 445         int status;
 446         int twoints[2];
 447         int retval = 0;
 448
 449         down (&usblp->sem);
 450         if (!usblp->present) {
 451                 retval = -ENODEV;
 452                 goto done;
 453         }
 454
 455         dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd),
 456                 _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd) );
 457
 458         if (_IOC_TYPE(cmd) == 'P')      /* new-style ioctl number */
 459
 460                 switch (_IOC_NR(cmd)) {
 461
 462                         case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
 463                                 if (_IOC_DIR(cmd) != _IOC_READ) {
 464                                         retval = -EINVAL;
 465                                         goto done;
 466                                 }
 467
 468                                 length = usblp_cache_device_id_string(usblp);
 469                                 if (length < 0) {
 470                                         retval = length;
 471                                         goto done;
 472                                 }
 473                                 if (length > _IOC_SIZE(cmd))
 474                                         length = _IOC_SIZE(cmd); /* truncate */
 475
 476                                 if (copy_to_user((void __user *) arg,
 477                                                 usblp->device_id_string,
 478                                                 (unsigned long) length)) {
 479                                         retval = -EFAULT;
 480                                         goto done;
 481                                 }
 482
 483                                 break;
 484
 485                         case IOCNR_GET_PROTOCOLS:
 486                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 487                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 488                                         retval = -EINVAL;
 489                                         goto done;
 490                                 }
 491
 492                                 twoints[0] = usblp->current_protocol;
 493                                 twoints[1] = 0;
 494                                 for (i = USBLP_FIRST_PROTOCOL;
 495                                      i <= USBLP_LAST_PROTOCOL; i++) {
 496                                         if (usblp->protocol[i].alt_setting >= 0)
 497                                                 twoints[1] |= (1<<i);
 498                                 }
 499
 500                                 if (copy_to_user((void __user *)arg,
 501                                                 (unsigned char *)twoints,
 502                                                 sizeof(twoints))) {
 503                                         retval = -EFAULT;
 504                                         goto done;
 505                                 }
 506
 507                                 break;
 508
 509                         case IOCNR_SET_PROTOCOL:
 510                                 if (_IOC_DIR(cmd) != _IOC_WRITE) {
 511                                         retval = -EINVAL;
 512                                         goto done;
 513                                 }
 514
 515 #ifdef DEBUG
 516                                 if (arg == -10) {
 517                                         usblp_dump(usblp);
 518                                         break;
 519                                 }
 520 #endif
 521
 522                                 usblp_unlink_urbs(usblp);
 523                                 retval = usblp_set_protocol(usblp, arg);
 524                                 if (retval < 0) {
 525                                         usblp_set_protocol(usblp,
 526                                                 usblp->current_protocol);
 527                                 }
 528                                 break;
 529
 530                         case IOCNR_HP_SET_CHANNEL:
 531                                 if (_IOC_DIR(cmd) != _IOC_WRITE ||
 532                                     le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
 533                                     usblp->quirks & USBLP_QUIRK_BIDIR) {
 534                                         retval = -EINVAL;
 535                                         goto done;
 536                                 }
 537
 538                                 err = usblp_hp_channel_change_request(usblp,
 539                                         arg, &newChannel);
 540                                 if (err < 0) {
 541                                         err("usblp%d: error = %d setting "
 542                                                 "HP channel",
 543                                                 usblp->minor, err);
 544                                         retval = -EIO;
 545                                         goto done;
 546                                 }
 547
 548                                 dbg("usblp%d requested/got HP channel %ld/%d",
 549                                         usblp->minor, arg, newChannel);
 550                                 break;
 551
 552                         case IOCNR_GET_BUS_ADDRESS:
 553                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 554                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 555                                         retval = -EINVAL;
 556                                         goto done;
 557                                 }
 558
 559                                 twoints[0] = usblp->dev->bus->busnum;
 560                                 twoints[1] = usblp->dev->devnum;
 561                                 if (copy_to_user((void __user *)arg,
 562                                                 (unsigned char *)twoints,
 563                                                 sizeof(twoints))) {
 564                                         retval = -EFAULT;
 565                                         goto done;
 566                                 }
 567
 568                                 dbg("usblp%d is bus=%d, device=%d",
 569                                         usblp->minor, twoints[0], twoints[1]);
 570                                 break;
 571
 572                         case IOCNR_GET_VID_PID:
 573                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 574                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 575                                         retval = -EINVAL;
 576                                         goto done;
 577                                 }
 578
 579                                 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
 580                                 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
 581                                 if (copy_to_user((void __user *)arg,
 582                                                 (unsigned char *)twoints,
 583                                                 sizeof(twoints))) {
 584                                         retval = -EFAULT;
 585                                         goto done;
 586                                 }
 587
 588                                 dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X",
 589                                         usblp->minor, twoints[0], twoints[1]);
 590                                 break;
 591
 592                         case IOCNR_SOFT_RESET:
 593                                 if (_IOC_DIR(cmd) != _IOC_NONE) {
 594                                         retval = -EINVAL;
 595                                         goto done;
 596                                 }
 597                                 retval = usblp_reset(usblp);
 598                                 break;
 599                         default:
 600                                 retval = -ENOTTY;
 601                 }
 602         else    /* old-style ioctl value */
 603                 switch (cmd) {
 604
 605                         case LPGETSTATUS:
 606                                 if (usblp_read_status(usblp, usblp->statusbuf)) {
 607                                         err("usblp%d: failed reading printer status", usblp->minor);
 608                                         retval = -EIO;
 609                                         goto done;
 610                                 }
 611                                 status = *usblp->statusbuf;
 612                                 if (copy_to_user ((void __user *)arg, &status, sizeof(int)))
 613                                         retval = -EFAULT;
 614                                 break;
 615
 616                         default:
 617                                 retval = -ENOTTY;
 618                 }
 619
 620 done:
 621         up (&usblp->sem);
 622         return retval;
 623 }
 624
 625 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 626 {
 627         DECLARE_WAITQUEUE(wait, current);
 628         struct usblp *usblp = file->private_data;
 629         int timeout, err = 0, transfer_length = 0;
 630         size_t writecount = 0;
 631
 632         while (writecount < count) {
 633                 if (!usblp->wcomplete) {
 634                         barrier();
 635                         if (file->f_flags & O_NONBLOCK) {
 636                                 writecount += transfer_length;
 637                                 return writecount ? writecount : -EAGAIN;
 638                         }
 639
 640                         timeout = USBLP_WRITE_TIMEOUT;
 641                         add_wait_queue(&usblp->wait, &wait);
 642                         while ( 1==1 ) {
 643
 644                                 if (signal_pending(current)) {
 645                                         remove_wait_queue(&usblp->wait, &wait);
 646                                         return writecount ? writecount : -EINTR;
 647                                 }
 648                                 set_current_state(TASK_INTERRUPTIBLE);
 649                                 if (timeout && !usblp->wcomplete) {
 650                                         timeout = schedule_timeout(timeout);
 651                                 } else {
 652                                         set_current_state(TASK_RUNNING);
 653                                         break;
 654                                 }
 655                         }
 656                         remove_wait_queue(&usblp->wait, &wait);
 657                 }
 658
 659                 down (&usblp->sem);
 660                 if (!usblp->present) {
 661                         up (&usblp->sem);
 662                         return -ENODEV;
 663                 }
 664
 665                 if (usblp->writeurb->status != 0) {
 666                         if (usblp->quirks & USBLP_QUIRK_BIDIR) {
 667                                 if (!usblp->wcomplete)
 668                                         err("usblp%d: error %d writing to printer",
 669                                                 usblp->minor, usblp->writeurb->status);
 670                                 err = usblp->writeurb->status;
 671                         } else
 672                                 err = usblp_check_status(usblp, err);
 673                         up (&usblp->sem);
 674
 675                         /* if the fault was due to disconnect, let khubd's
 676                          * call to usblp_disconnect() grab usblp->sem ...
 677                          */
 678                         schedule ();
 679                         continue;
 680                 }
 681
 682                 /* We must increment writecount here, and not at the
 683                  * end of the loop. Otherwise, the final loop iteration may
 684                  * be skipped, leading to incomplete printer output.
 685                  */
 686                 writecount += transfer_length;
 687                 if (writecount == count) {
 688                         up(&usblp->sem);
 689                         break;
 690                 }
 691
 692                 transfer_length=(count - writecount);
 693                 if (transfer_length > USBLP_BUF_SIZE)
 694                         transfer_length = USBLP_BUF_SIZE;
 695
 696                 usblp->writeurb->transfer_buffer_length = transfer_length;
 697
 698                 if (copy_from_user(usblp->writeurb->transfer_buffer,
 699                                    buffer + writecount, transfer_length)) {
 700                         up(&usblp->sem);
 701                         return writecount ? writecount : -EFAULT;
 702                 }
 703
 704                 usblp->writeurb->dev = usblp->dev;
 705                 usblp->wcomplete = 0;
 706                 err = usb_submit_urb(usblp->writeurb, GFP_KERNEL);
 707                 if (err) {
 708                         if (err != -ENOMEM)
 709                                 count = -EIO;
 710                         else
 711                                 count = writecount ? writecount : -ENOMEM;
 712                         up (&usblp->sem);
 713                         break;
 714                 }
 715                 up (&usblp->sem);
 716         }
 717
 718         return count;
 719 }
 720
 721 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 722 {
 723         struct usblp *usblp = file->private_data;
 724         DECLARE_WAITQUEUE(wait, current);
 725
 726         if (!usblp->bidir)
 727                 return -EINVAL;
 728
 729         down (&usblp->sem);
 730         if (!usblp->present) {
 731                 count = -ENODEV;
 732                 goto done;
 733         }
 734
 735         if (!usblp->rcomplete) {
 736                 barrier();
 737
 738                 if (file->f_flags & O_NONBLOCK) {
 739                         count = -EAGAIN;
 740                         goto done;
 741                 }
 742
 743                 add_wait_queue(&usblp->wait, &wait);
 744                 while (1==1) {
 745                         if (signal_pending(current)) {
 746                                 count = -EINTR;
 747                                 remove_wait_queue(&usblp->wait, &wait);
 748                                 goto done;
 749                         }
 750                         up (&usblp->sem);
 751                         set_current_state(TASK_INTERRUPTIBLE);
 752                         if (!usblp->rcomplete) {
 753                                 schedule();
 754                         } else {
 755                                 set_current_state(TASK_RUNNING);
 756                                 down(&usblp->sem);
 757                                 break;
 758                         }
 759                         down (&usblp->sem);
 760                 }
 761                 remove_wait_queue(&usblp->wait, &wait);
 762         }
 763
 764         if (!usblp->present) {
 765                 count = -ENODEV;
 766                 goto done;
 767         }
 768
 769         if (usblp->readurb->status) {
 770                 err("usblp%d: error %d reading from printer",
 771                         usblp->minor, usblp->readurb->status);
 772                 usblp->readurb->dev = usblp->dev;
 773                 usblp->readcount = 0;
 774                 usblp->rcomplete = 0;
 775                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0)
 776                         dbg("error submitting urb");
 777                 count = -EIO;
 778                 goto done;
 779         }
 780
 781         count = count < usblp->readurb->actual_length - usblp->readcount ?
 782                 count : usblp->readurb->actual_length - usblp->readcount;
 783
 784         if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) {
 785                 count = -EFAULT;
 786                 goto done;
 787         }
 788
 789         if ((usblp->readcount += count) == usblp->readurb->actual_length) {
 790                 usblp->readcount = 0;
 791                 usblp->readurb->dev = usblp->dev;
 792                 usblp->rcomplete = 0;
 793                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL)) {
 794                         count = -EIO;
 795                         goto done;
 796                 }
 797         }
 798
 799 done:
 800         up (&usblp->sem);
 801         return count;
 802 }
 803
 804 /*
 805  * Checks for printers that have quirks, such as requiring unidirectional
 806  * communication but reporting bidirectional; currently some HP printers
 807  * have this flaw (HP 810, 880, 895, etc.), or needing an init string
 808  * sent at each open (like some Epsons).
 809  * Returns 1 if found, 0 if not found.
 810  *
 811  * HP recommended that we use the bidirectional interface but
 812  * don't attempt any bulk IN transfers from the IN endpoint.
 813  * Here's some more detail on the problem:
 814  * The problem is not that it isn't bidirectional though. The problem
 815  * is that if you request a device ID, or status information, while
 816  * the buffers are full, the return data will end up in the print data
 817  * buffer. For example if you make sure you never request the device ID
 818  * while you are sending print data, and you don't try to query the
 819  * printer status every couple of milliseconds, you will probably be OK.
 820  */
 821 static unsigned int usblp_quirks (__u16 vendor, __u16 product)
 822 {
 823         int i;
 824
 825         for (i = 0; quirk_printers[i].vendorId; i++) {
 826                 if (vendor == quirk_printers[i].vendorId &&
 827                     product == quirk_printers[i].productId)
 828                         return quirk_printers[i].quirks;
 829         }
 830         return 0;
 831 }
 832
 833 static struct file_operations usblp_fops = {
 834         .owner =        THIS_MODULE,
 835         .read =         usblp_read,
 836         .write =        usblp_write,
 837         .poll =         usblp_poll,
 838         .ioctl =        usblp_ioctl,
 839         .open =         usblp_open,
 840         .release =      usblp_release,
 841 };
 842
 843 static struct usb_class_driver usblp_class = {
 844         .name =         "usb/lp%d",
 845         .fops =         &usblp_fops,
 846         .mode =         S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,
 847         .minor_base =   USBLP_MINOR_BASE,
 848 };
 849
 850 static int usblp_probe(struct usb_interface *intf,
 851                        const struct usb_device_id *id)
 852 {
 853         struct usb_device *dev = interface_to_usbdev (intf);
 854         struct usblp *usblp = NULL;
 855         int protocol;
 856         int retval;
 857
 858         /* Malloc and start initializing usblp structure so we can use it
 859          * directly. */
 860         if (!(usblp = kmalloc(sizeof(struct usblp), GFP_KERNEL))) {
 861                 err("out of memory for usblp");
 862                 goto abort;
 863         }
 864         memset(usblp, 0, sizeof(struct usblp));
 865         usblp->dev = dev;
 866         init_MUTEX (&usblp->sem);
 867         init_waitqueue_head(&usblp->wait);
 868         usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
 869         usblp->intf = intf;
 870
 871         usblp->writeurb = usb_alloc_urb(0, GFP_KERNEL);
 872         if (!usblp->writeurb) {
 873                 err("out of memory");
 874                 goto abort;
 875         }
 876         usblp->readurb = usb_alloc_urb(0, GFP_KERNEL);
 877         if (!usblp->readurb) {
 878                 err("out of memory");
 879                 goto abort;
 880         }
 881
 882         /* Malloc device ID string buffer to the largest expected length,
 883          * since we can re-query it on an ioctl and a dynamic string
 884          * could change in length. */
 885         if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
 886                 err("out of memory for device_id_string");
 887                 goto abort;
 888         }
 889
 890         usblp->writebuf = usblp->readbuf = NULL;
 891         usblp->writeurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 892         usblp->readurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 893         /* Malloc write & read buffers.  We somewhat wastefully
 894          * malloc both regardless of bidirectionality, because the
 895          * alternate setting can be changed later via an ioctl. */
 896         if (!(usblp->writebuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
 897                                 GFP_KERNEL, &usblp->writeurb->transfer_dma))) {
 898                 err("out of memory for write buf");
 899                 goto abort;
 900         }
 901         if (!(usblp->readbuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
 902                                 GFP_KERNEL, &usblp->readurb->transfer_dma))) {
 903                 err("out of memory for read buf");
 904                 goto abort;
 905         }
 906
 907         /* Allocate buffer for printer status */
 908         usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
 909         if (!usblp->statusbuf) {
 910                 err("out of memory for statusbuf");
 911                 goto abort;
 912         }
 913
 914         /* Lookup quirks for this printer. */
 915         usblp->quirks = usblp_quirks(
 916                 le16_to_cpu(dev->descriptor.idVendor),
 917                 le16_to_cpu(dev->descriptor.idProduct));
 918
 919         /* Analyze and pick initial alternate settings and endpoints. */
 920         protocol = usblp_select_alts(usblp);
 921         if (protocol < 0) {
 922                 dbg("incompatible printer-class device 0x%4.4X/0x%4.4X",
 923                         le16_to_cpu(dev->descriptor.idVendor),
 924                         le16_to_cpu(dev->descriptor.idProduct));
 925                 goto abort;
 926         }
 927
 928         /* Setup the selected alternate setting and endpoints. */
 929         if (usblp_set_protocol(usblp, protocol) < 0)
 930                 goto abort;
 931
 932         /* Retrieve and store the device ID string. */
 933         usblp_cache_device_id_string(usblp);
 934
 935 #ifdef DEBUG
 936         usblp_check_status(usblp, 0);
 937 #endif
 938
 939         info("usblp%d: USB %sdirectional printer dev %d "
 940                 "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X",
 941                 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
 942                 usblp->ifnum,
 943                 usblp->protocol[usblp->current_protocol].alt_setting,
 944                 usblp->current_protocol,
 945                 le16_to_cpu(usblp->dev->descriptor.idVendor),
 946                 le16_to_cpu(usblp->dev->descriptor.idProduct));
 947
 948         usb_set_intfdata (intf, usblp);
 949
 950         usblp->present = 1;
 951
 952         retval = usb_register_dev(intf, &usblp_class);
 953         if (retval) {
 954                 err("Not able to get a minor for this device.");
 955                 goto abort_intfdata;
 956         }
 957         usblp->minor = intf->minor;
 958
 959         return 0;
 960
 961 abort_intfdata:
 962         usb_set_intfdata (intf, NULL);
 963 abort:
 964         if (usblp) {
 965                 if (usblp->writebuf)
 966                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 967                                 usblp->writebuf, usblp->writeurb->transfer_dma);
 968                 if (usblp->readbuf)
 969                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 970                                 usblp->readbuf, usblp->writeurb->transfer_dma);
 971                 kfree(usblp->statusbuf);
 972                 kfree(usblp->device_id_string);
 973                 usb_free_urb(usblp->writeurb);
 974                 usb_free_urb(usblp->readurb);
 975                 kfree(usblp);
 976         }
 977         return -EIO;
 978 }
 979
 980 /*
 981  * We are a "new" style driver with usb_device_id table,
 982  * but our requirements are too intricate for simple match to handle.
 983  *
 984  * The "proto_bias" option may be used to specify the preferred protocol
 985  * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3).  If the device
 986  * supports the preferred protocol, then we bind to it.
 987  *
 988  * The best interface for us is 7/1/2, because it is compatible
 989  * with a stream of characters. If we find it, we bind to it.
 990  *
 991  * Note that the people from hpoj.sourceforge.net need to be able to
 992  * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
 993  *
 994  * Failing 7/1/2, we look for 7/1/3, even though it's probably not
 995  * stream-compatible, because this matches the behaviour of the old code.
 996  *
 997  * If nothing else, we bind to 7/1/1 - the unidirectional interface.
 998  */
 999 static int usblp_select_alts(struct usblp *usblp)
1000 {
1001         struct usb_interface *if_alt;
1002         struct usb_host_interface *ifd;
1003         struct usb_endpoint_descriptor *epd, *epwrite, *epread;
1004         int p, i, e;
1005
1006         if_alt = usblp->intf;
1007
1008         for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1009                 usblp->protocol[p].alt_setting = -1;
1010
1011         /* Find out what we have. */
1012         for (i = 0; i < if_alt->num_altsetting; i++) {
1013                 ifd = &if_alt->altsetting[i];
1014
1015                 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
1016                         continue;
1017
1018                 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1019                     ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1020                         continue;
1021
1022                 /* Look for bulk OUT and IN endpoints. */
1023                 epwrite = epread = NULL;
1024                 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1025                         epd = &ifd->endpoint[e].desc;
1026
1027                         if ((epd->bmAttributes&USB_ENDPOINT_XFERTYPE_MASK)!=
1028                             USB_ENDPOINT_XFER_BULK)
1029                                 continue;
1030
1031                         if (!(epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK)) {
1032                                 if (!epwrite)
1033                                         epwrite = epd;
1034
1035                         } else {
1036                                 if (!epread)
1037                                         epread = epd;
1038                         }
1039                 }
1040
1041                 /* Ignore buggy hardware without the right endpoints. */
1042                 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1043                         continue;
1044
1045                 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1046                  * and buggy bidirectional printers. */
1047                 if (ifd->desc.bInterfaceProtocol == 1) {
1048                         epread = NULL;
1049                 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1050                         info("Disabling reads from problem bidirectional "
1051                                 "printer on usblp%d", usblp->minor);
1052                         epread = NULL;
1053                 }
1054
1055                 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1056                                 ifd->desc.bAlternateSetting;
1057                 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1058                 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1059         }
1060
1061         /* If our requested protocol is supported, then use it. */
1062         if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1063             proto_bias <= USBLP_LAST_PROTOCOL &&
1064             usblp->protocol[proto_bias].alt_setting != -1)
1065                 return proto_bias;
1066
1067         /* Ordering is important here. */
1068         if (usblp->protocol[2].alt_setting != -1)
1069                 return 2;
1070         if (usblp->protocol[1].alt_setting != -1)
1071                 return 1;
1072         if (usblp->protocol[3].alt_setting != -1)
1073                 return 3;
1074
1075         /* If nothing is available, then don't bind to this device. */
1076         return -1;
1077 }
1078
1079 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1080 {
1081         int r, alts;
1082
1083         if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1084                 return -EINVAL;
1085
1086         alts = usblp->protocol[protocol].alt_setting;
1087         if (alts < 0)
1088                 return -EINVAL;
1089         r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1090         if (r < 0) {
1091                 err("can't set desired altsetting %d on interface %d",
1092                         alts, usblp->ifnum);
1093                 return r;
1094         }
1095
1096         usb_fill_bulk_urb(usblp->writeurb, usblp->dev,
1097                 usb_sndbulkpipe(usblp->dev,
1098                   usblp->protocol[protocol].epwrite->bEndpointAddress),
1099                 usblp->writebuf, 0,
1100                 usblp_bulk_write, usblp);
1101
1102         usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1103         if (usblp->bidir)
1104                 usb_fill_bulk_urb(usblp->readurb, usblp->dev,
1105                         usb_rcvbulkpipe(usblp->dev,
1106                           usblp->protocol[protocol].epread->bEndpointAddress),
1107                         usblp->readbuf, USBLP_BUF_SIZE,
1108                         usblp_bulk_read, usblp);
1109
1110         usblp->current_protocol = protocol;
1111         dbg("usblp%d set protocol %d", usblp->minor, protocol);
1112         return 0;
1113 }
1114
1115 /* Retrieves and caches device ID string.
1116  * Returns length, including length bytes but not null terminator.
1117  * On error, returns a negative errno value. */
1118 static int usblp_cache_device_id_string(struct usblp *usblp)
1119 {
1120         int err, length;
1121
1122         err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1123         if (err < 0) {
1124                 dbg("usblp%d: error = %d reading IEEE-1284 Device ID string",
1125                         usblp->minor, err);
1126                 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1127                 return -EIO;
1128         }
1129
1130         /* First two bytes are length in big-endian.
1131          * They count themselves, and we copy them into
1132          * the user's buffer. */
1133         length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1134         if (length < 2)
1135                 length = 2;
1136         else if (length >= USBLP_DEVICE_ID_SIZE)
1137                 length = USBLP_DEVICE_ID_SIZE - 1;
1138         usblp->device_id_string[length] = '\0';
1139
1140         dbg("usblp%d Device ID string [len=%d]=\"%s\"",
1141                 usblp->minor, length, &usblp->device_id_string[2]);
1142
1143         return length;
1144 }
1145
1146 static void usblp_disconnect(struct usb_interface *intf)
1147 {
1148         struct usblp *usblp = usb_get_intfdata (intf);
1149
1150         usb_deregister_dev(intf, &usblp_class);
1151
1152         if (!usblp || !usblp->dev) {
1153                 err("bogus disconnect");
1154                 BUG ();
1155         }
1156
1157         down (&usblp_sem);
1158         down (&usblp->sem);
1159         usblp->present = 0;
1160         usb_set_intfdata (intf, NULL);
1161
1162         usblp_unlink_urbs(usblp);
1163         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1164                         usblp->writebuf, usblp->writeurb->transfer_dma);
1165         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1166                         usblp->readbuf, usblp->readurb->transfer_dma);
1167         up (&usblp->sem);
1168
1169         if (!usblp->used)
1170                 usblp_cleanup (usblp);
1171         up (&usblp_sem);
1172 }
1173
1174 static struct usb_device_id usblp_ids [] = {
1175         { USB_DEVICE_INFO(7, 1, 1) },
1176         { USB_DEVICE_INFO(7, 1, 2) },
1177         { USB_DEVICE_INFO(7, 1, 3) },
1178         { USB_INTERFACE_INFO(7, 1, 1) },
1179         { USB_INTERFACE_INFO(7, 1, 2) },
1180         { USB_INTERFACE_INFO(7, 1, 3) },
1181         { }                                             /* Terminating entry */
1182 };
1183
1184 MODULE_DEVICE_TABLE (usb, usblp_ids);
1185
1186 static struct usb_driver usblp_driver = {
1187         .owner =        THIS_MODULE,
1188         .name =         "usblp",
1189         .probe =        usblp_probe,
1190         .disconnect =   usblp_disconnect,
1191         .id_table =     usblp_ids,
1192 };
1193
1194 static int __init usblp_init(void)
1195 {
1196         int retval;
1197         retval = usb_register(&usblp_driver);
1198         if (retval)
1199                 goto out;
1200         info(DRIVER_VERSION ": " DRIVER_DESC);
1201 out:
1202         return retval;
1203 }
1204
1205 static void __exit usblp_exit(void)
1206 {
1207         usb_deregister(&usblp_driver);
1208 }
1209
1210 module_init(usblp_init);
1211 module_exit(usblp_exit);
1212
1213 MODULE_AUTHOR( DRIVER_AUTHOR );
1214 MODULE_DESCRIPTION( DRIVER_DESC );
1215 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1216 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1217 MODULE_LICENSE("GPL");