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     (5*HZ)                  /* 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
 226 /*
 227  * Functions for usblp control messages.
 228  */
 229
 230 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
 231 {
 232         int retval;
 233         int index = usblp->ifnum;
 234
 235         /* High byte has the interface index.
 236            Low byte has the alternate setting.
 237          */
 238         if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) {
 239           index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
 240         }
 241
 242         retval = usb_control_msg(usblp->dev,
 243                 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
 244                 request, type | dir | recip, value, index, buf, len, USBLP_WRITE_TIMEOUT);
 245         dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d",
 246                 request, !!dir, recip, value, index, len, retval);
 247         return retval < 0 ? retval : 0;
 248 }
 249
 250 #define usblp_read_status(usblp, status)\
 251         usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
 252 #define usblp_get_id(usblp, config, id, maxlen)\
 253         usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
 254 #define usblp_reset(usblp)\
 255         usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
 256
 257 #define usblp_hp_channel_change_request(usblp, channel, buffer) \
 258         usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
 259
 260 /*
 261  * See the description for usblp_select_alts() below for the usage
 262  * explanation.  Look into your /proc/bus/usb/devices and dmesg in
 263  * case of any trouble.
 264  */
 265 static int proto_bias = -1;
 266
 267 /*
 268  * URB callback.
 269  */
 270
 271 static void usblp_bulk_read(struct urb *urb, struct pt_regs *regs)
 272 {
 273         struct usblp *usblp = urb->context;
 274
 275         if (!usblp || !usblp->dev || !usblp->used || !usblp->present)
 276                 return;
 277
 278         if (unlikely(urb->status))
 279                 warn("usblp%d: nonzero read/write bulk status received: %d",
 280                         usblp->minor, urb->status);
 281         usblp->rcomplete = 1;
 282         wake_up_interruptible(&usblp->wait);
 283 }
 284
 285 static void usblp_bulk_write(struct urb *urb, struct pt_regs *regs)
 286 {
 287         struct usblp *usblp = urb->context;
 288
 289         if (!usblp || !usblp->dev || !usblp->used || !usblp->present)
 290                 return;
 291
 292         if (unlikely(urb->status))
 293                 warn("usblp%d: nonzero read/write bulk status received: %d",
 294                         usblp->minor, urb->status);
 295         usblp->wcomplete = 1;
 296         wake_up_interruptible(&usblp->wait);
 297 }
 298
 299 /*
 300  * Get and print printer errors.
 301  */
 302
 303 static char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
 304
 305 static int usblp_check_status(struct usblp *usblp, int err)
 306 {
 307         unsigned char status, newerr = 0;
 308         int error;
 309
 310         error = usblp_read_status (usblp, usblp->statusbuf);
 311         if (error < 0) {
 312                 err("usblp%d: error %d reading printer status",
 313                         usblp->minor, error);
 314                 return 0;
 315         }
 316
 317         status = *usblp->statusbuf;
 318
 319         if (~status & LP_PERRORP)
 320                 newerr = 3;
 321         if (status & LP_POUTPA)
 322                 newerr = 1;
 323         if (~status & LP_PSELECD)
 324                 newerr = 2;
 325
 326         if (newerr != err)
 327                 info("usblp%d: %s", usblp->minor, usblp_messages[newerr]);
 328
 329         return newerr;
 330 }
 331
 332 /*
 333  * File op functions.
 334  */
 335
 336 static int usblp_open(struct inode *inode, struct file *file)
 337 {
 338         int minor = iminor(inode);
 339         struct usblp *usblp;
 340         struct usb_interface *intf;
 341         int retval;
 342
 343         if (minor < 0)
 344                 return -ENODEV;
 345
 346         lock_kernel();
 347
 348         retval = -ENODEV;
 349         intf = usb_find_interface(&usblp_driver, minor);
 350         if (!intf) {
 351                 goto out;
 352         }
 353         usblp = usb_get_intfdata (intf);
 354         if (!usblp || !usblp->dev || !usblp->present)
 355                 goto out;
 356
 357         retval = -EBUSY;
 358         if (usblp->used)
 359                 goto out;
 360
 361         /*
 362          * TODO: need to implement LP_ABORTOPEN + O_NONBLOCK as in drivers/char/lp.c ???
 363          * This is #if 0-ed because we *don't* want to fail an open
 364          * just because the printer is off-line.
 365          */
 366 #if 0
 367         if ((retval = usblp_check_status(usblp, 0))) {
 368                 retval = retval > 1 ? -EIO : -ENOSPC;
 369                 goto out;
 370         }
 371 #else
 372         retval = 0;
 373 #endif
 374
 375         usblp->used = 1;
 376         file->private_data = usblp;
 377
 378         usblp->writeurb->transfer_buffer_length = 0;
 379         usblp->wcomplete = 1; /* we begin writeable */
 380         usblp->rcomplete = 0;
 381
 382         if (usblp->bidir) {
 383                 usblp->readcount = 0;
 384                 usblp->readurb->dev = usblp->dev;
 385                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) {
 386                         retval = -EIO;
 387                         usblp->used = 0;
 388                         file->private_data = NULL;
 389                 }
 390         }
 391 out:
 392         unlock_kernel();
 393         return retval;
 394 }
 395
 396 static void usblp_cleanup (struct usblp *usblp)
 397 {
 398         info("usblp%d: removed", usblp->minor);
 399
 400         kfree (usblp->device_id_string);
 401         kfree (usblp->statusbuf);
 402         usb_free_urb(usblp->writeurb);
 403         usb_free_urb(usblp->readurb);
 404         kfree (usblp);
 405 }
 406
 407 static void usblp_unlink_urbs(struct usblp *usblp)
 408 {
 409         usb_unlink_urb(usblp->writeurb);
 410         if (usblp->bidir)
 411                 usb_unlink_urb(usblp->readurb);
 412 }
 413
 414 static int usblp_release(struct inode *inode, struct file *file)
 415 {
 416         struct usblp *usblp = file->private_data;
 417
 418         down (&usblp->sem);
 419         usblp->used = 0;
 420         if (usblp->present) {
 421                 usblp_unlink_urbs(usblp);
 422                 up(&usblp->sem);
 423         } else          /* finish cleanup from disconnect */
 424                 usblp_cleanup (usblp);
 425         return 0;
 426 }
 427
 428 /* No kernel lock - fine */
 429 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
 430 {
 431         struct usblp *usblp = file->private_data;
 432         poll_wait(file, &usblp->wait, wait);
 433         return ((!usblp->bidir || !usblp->rcomplete) ? 0 : POLLIN  | POLLRDNORM)
 434                                | (!usblp->wcomplete ? 0 : POLLOUT | POLLWRNORM);
 435 }
 436
 437 static int usblp_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 438 {
 439         struct usblp *usblp = file->private_data;
 440         int length, err, i;
 441         unsigned char newChannel;
 442         int status;
 443         int twoints[2];
 444         int retval = 0;
 445
 446         down (&usblp->sem);
 447         if (!usblp->present) {
 448                 retval = -ENODEV;
 449                 goto done;
 450         }
 451
 452         dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd),
 453                 _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd) );
 454
 455         if (_IOC_TYPE(cmd) == 'P')      /* new-style ioctl number */
 456
 457                 switch (_IOC_NR(cmd)) {
 458
 459                         case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
 460                                 if (_IOC_DIR(cmd) != _IOC_READ) {
 461                                         retval = -EINVAL;
 462                                         goto done;
 463                                 }
 464
 465                                 length = usblp_cache_device_id_string(usblp);
 466                                 if (length < 0) {
 467                                         retval = length;
 468                                         goto done;
 469                                 }
 470                                 if (length > _IOC_SIZE(cmd))
 471                                         length = _IOC_SIZE(cmd); /* truncate */
 472
 473                                 if (copy_to_user((void __user *) arg,
 474                                                 usblp->device_id_string,
 475                                                 (unsigned long) length)) {
 476                                         retval = -EFAULT;
 477                                         goto done;
 478                                 }
 479
 480                                 break;
 481
 482                         case IOCNR_GET_PROTOCOLS:
 483                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 484                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 485                                         retval = -EINVAL;
 486                                         goto done;
 487                                 }
 488
 489                                 twoints[0] = usblp->current_protocol;
 490                                 twoints[1] = 0;
 491                                 for (i = USBLP_FIRST_PROTOCOL;
 492                                      i <= USBLP_LAST_PROTOCOL; i++) {
 493                                         if (usblp->protocol[i].alt_setting >= 0)
 494                                                 twoints[1] |= (1<<i);
 495                                 }
 496
 497                                 if (copy_to_user((void __user *)arg,
 498                                                 (unsigned char *)twoints,
 499                                                 sizeof(twoints))) {
 500                                         retval = -EFAULT;
 501                                         goto done;
 502                                 }
 503
 504                                 break;
 505
 506                         case IOCNR_SET_PROTOCOL:
 507                                 if (_IOC_DIR(cmd) != _IOC_WRITE) {
 508                                         retval = -EINVAL;
 509                                         goto done;
 510                                 }
 511
 512 #ifdef DEBUG
 513                                 if (arg == -10) {
 514                                         usblp_dump(usblp);
 515                                         break;
 516                                 }
 517 #endif
 518
 519                                 usblp_unlink_urbs(usblp);
 520                                 retval = usblp_set_protocol(usblp, arg);
 521                                 if (retval < 0) {
 522                                         usblp_set_protocol(usblp,
 523                                                 usblp->current_protocol);
 524                                 }
 525                                 break;
 526
 527                         case IOCNR_HP_SET_CHANNEL:
 528                                 if (_IOC_DIR(cmd) != _IOC_WRITE ||
 529                                     usblp->dev->descriptor.idVendor != 0x03F0 ||
 530                                     usblp->quirks & USBLP_QUIRK_BIDIR) {
 531                                         retval = -EINVAL;
 532                                         goto done;
 533                                 }
 534
 535                                 err = usblp_hp_channel_change_request(usblp,
 536                                         arg, &newChannel);
 537                                 if (err < 0) {
 538                                         err("usblp%d: error = %d setting "
 539                                                 "HP channel",
 540                                                 usblp->minor, err);
 541                                         retval = -EIO;
 542                                         goto done;
 543                                 }
 544
 545                                 dbg("usblp%d requested/got HP channel %ld/%d",
 546                                         usblp->minor, arg, newChannel);
 547                                 break;
 548
 549                         case IOCNR_GET_BUS_ADDRESS:
 550                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 551                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 552                                         retval = -EINVAL;
 553                                         goto done;
 554                                 }
 555
 556                                 twoints[0] = usblp->dev->bus->busnum;
 557                                 twoints[1] = usblp->dev->devnum;
 558                                 if (copy_to_user((void __user *)arg,
 559                                                 (unsigned char *)twoints,
 560                                                 sizeof(twoints))) {
 561                                         retval = -EFAULT;
 562                                         goto done;
 563                                 }
 564
 565                                 dbg("usblp%d is bus=%d, device=%d",
 566                                         usblp->minor, twoints[0], twoints[1]);
 567                                 break;
 568
 569                         case IOCNR_GET_VID_PID:
 570                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 571                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 572                                         retval = -EINVAL;
 573                                         goto done;
 574                                 }
 575
 576                                 twoints[0] = usblp->dev->descriptor.idVendor;
 577                                 twoints[1] = usblp->dev->descriptor.idProduct;
 578                                 if (copy_to_user((void __user *)arg,
 579                                                 (unsigned char *)twoints,
 580                                                 sizeof(twoints))) {
 581                                         retval = -EFAULT;
 582                                         goto done;
 583                                 }
 584
 585                                 dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X",
 586                                         usblp->minor, twoints[0], twoints[1]);
 587                                 break;
 588
 589                         case IOCNR_SOFT_RESET:
 590                                 if (_IOC_DIR(cmd) != _IOC_NONE) {
 591                                         retval = -EINVAL;
 592                                         goto done;
 593                                 }
 594                                 retval = usblp_reset(usblp);
 595                                 break;
 596                         default:
 597                                 retval = -ENOTTY;
 598                 }
 599         else    /* old-style ioctl value */
 600                 switch (cmd) {
 601
 602                         case LPGETSTATUS:
 603                                 if (usblp_read_status(usblp, usblp->statusbuf)) {
 604                                         err("usblp%d: failed reading printer status", usblp->minor);
 605                                         retval = -EIO;
 606                                         goto done;
 607                                 }
 608                                 status = *usblp->statusbuf;
 609                                 if (copy_to_user ((void __user *)arg, &status, sizeof(int)))
 610                                         retval = -EFAULT;
 611                                 break;
 612
 613                         default:
 614                                 retval = -ENOTTY;
 615                 }
 616
 617 done:
 618         up (&usblp->sem);
 619         return retval;
 620 }
 621
 622 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 623 {
 624         DECLARE_WAITQUEUE(wait, current);
 625         struct usblp *usblp = file->private_data;
 626         int timeout, err = 0, transfer_length = 0;
 627         size_t writecount = 0;
 628
 629         while (writecount < count) {
 630                 if (!usblp->wcomplete) {
 631                         barrier();
 632                         if (file->f_flags & O_NONBLOCK) {
 633                                 writecount += transfer_length;
 634                                 return writecount ? writecount : -EAGAIN;
 635                         }
 636
 637                         timeout = USBLP_WRITE_TIMEOUT;
 638                         add_wait_queue(&usblp->wait, &wait);
 639                         while ( 1==1 ) {
 640
 641                                 if (signal_pending(current)) {
 642                                         remove_wait_queue(&usblp->wait, &wait);
 643                                         return writecount ? writecount : -EINTR;
 644                                 }
 645                                 set_current_state(TASK_INTERRUPTIBLE);
 646                                 if (timeout && !usblp->wcomplete) {
 647                                         timeout = schedule_timeout(timeout);
 648                                 } else {
 649                                         set_current_state(TASK_RUNNING);
 650                                         break;
 651                                 }
 652                         }
 653                         remove_wait_queue(&usblp->wait, &wait);
 654                 }
 655
 656                 down (&usblp->sem);
 657                 if (!usblp->present) {
 658                         up (&usblp->sem);
 659                         return -ENODEV;
 660                 }
 661
 662                 if (usblp->writeurb->status != 0) {
 663                         if (usblp->quirks & USBLP_QUIRK_BIDIR) {
 664                                 if (!usblp->wcomplete)
 665                                         err("usblp%d: error %d writing to printer",
 666                                                 usblp->minor, usblp->writeurb->status);
 667                                 err = usblp->writeurb->status;
 668                         } else
 669                                 err = usblp_check_status(usblp, err);
 670                         up (&usblp->sem);
 671
 672                         /* if the fault was due to disconnect, let khubd's
 673                          * call to usblp_disconnect() grab usblp->sem ...
 674                          */
 675                         schedule ();
 676                         continue;
 677                 }
 678
 679                 /* We must increment writecount here, and not at the
 680                  * end of the loop. Otherwise, the final loop iteration may
 681                  * be skipped, leading to incomplete printer output.
 682                  */
 683                 writecount += transfer_length;
 684                 if (writecount == count) {
 685                         up(&usblp->sem);
 686                         break;
 687                 }
 688
 689                 transfer_length=(count - writecount);
 690                 if (transfer_length > USBLP_BUF_SIZE)
 691                         transfer_length = USBLP_BUF_SIZE;
 692
 693                 usblp->writeurb->transfer_buffer_length = transfer_length;
 694
 695                 if (copy_from_user(usblp->writeurb->transfer_buffer,
 696                                    buffer + writecount, transfer_length)) {
 697                         up(&usblp->sem);
 698                         return writecount ? writecount : -EFAULT;
 699                 }
 700
 701                 usblp->writeurb->dev = usblp->dev;
 702                 usblp->wcomplete = 0;
 703                 err = usb_submit_urb(usblp->writeurb, GFP_KERNEL);
 704                 if (err) {
 705                         if (err != -ENOMEM)
 706                                 count = -EIO;
 707                         else
 708                                 count = writecount ? writecount : -ENOMEM;
 709                         up (&usblp->sem);
 710                         break;
 711                 }
 712                 up (&usblp->sem);
 713         }
 714
 715         return count;
 716 }
 717
 718 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 719 {
 720         struct usblp *usblp = file->private_data;
 721         DECLARE_WAITQUEUE(wait, current);
 722
 723         if (!usblp->bidir)
 724                 return -EINVAL;
 725
 726         down (&usblp->sem);
 727         if (!usblp->present) {
 728                 count = -ENODEV;
 729                 goto done;
 730         }
 731
 732         if (!usblp->rcomplete) {
 733                 barrier();
 734
 735                 if (file->f_flags & O_NONBLOCK) {
 736                         count = -EAGAIN;
 737                         goto done;
 738                 }
 739
 740                 add_wait_queue(&usblp->wait, &wait);
 741                 while (1==1) {
 742                         if (signal_pending(current)) {
 743                                 count = -EINTR;
 744                                 remove_wait_queue(&usblp->wait, &wait);
 745                                 goto done;
 746                         }
 747                         up (&usblp->sem);
 748                         set_current_state(TASK_INTERRUPTIBLE);
 749                         if (!usblp->rcomplete) {
 750                                 schedule();
 751                         } else {
 752                                 set_current_state(TASK_RUNNING);
 753                                 break;
 754                         }
 755                         down (&usblp->sem);
 756                 }
 757                 remove_wait_queue(&usblp->wait, &wait);
 758         }
 759
 760         if (!usblp->present) {
 761                 count = -ENODEV;
 762                 goto done;
 763         }
 764
 765         if (usblp->readurb->status) {
 766                 err("usblp%d: error %d reading from printer",
 767                         usblp->minor, usblp->readurb->status);
 768                 usblp->readurb->dev = usblp->dev;
 769                 usblp->readcount = 0;
 770                 usblp->rcomplete = 0;
 771                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0)
 772                         dbg("error submitting urb");
 773                 count = -EIO;
 774                 goto done;
 775         }
 776
 777         count = count < usblp->readurb->actual_length - usblp->readcount ?
 778                 count : usblp->readurb->actual_length - usblp->readcount;
 779
 780         if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) {
 781                 count = -EFAULT;
 782                 goto done;
 783         }
 784
 785         if ((usblp->readcount += count) == usblp->readurb->actual_length) {
 786                 usblp->readcount = 0;
 787                 usblp->readurb->dev = usblp->dev;
 788                 usblp->rcomplete = 0;
 789                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL)) {
 790                         count = -EIO;
 791                         goto done;
 792                 }
 793         }
 794
 795 done:
 796         up (&usblp->sem);
 797         return count;
 798 }
 799
 800 /*
 801  * Checks for printers that have quirks, such as requiring unidirectional
 802  * communication but reporting bidirectional; currently some HP printers
 803  * have this flaw (HP 810, 880, 895, etc.), or needing an init string
 804  * sent at each open (like some Epsons).
 805  * Returns 1 if found, 0 if not found.
 806  *
 807  * HP recommended that we use the bidirectional interface but
 808  * don't attempt any bulk IN transfers from the IN endpoint.
 809  * Here's some more detail on the problem:
 810  * The problem is not that it isn't bidirectional though. The problem
 811  * is that if you request a device ID, or status information, while
 812  * the buffers are full, the return data will end up in the print data
 813  * buffer. For example if you make sure you never request the device ID
 814  * while you are sending print data, and you don't try to query the
 815  * printer status every couple of milliseconds, you will probably be OK.
 816  */
 817 static unsigned int usblp_quirks (__u16 vendor, __u16 product)
 818 {
 819         int i;
 820
 821         for (i = 0; quirk_printers[i].vendorId; i++) {
 822                 if (vendor == quirk_printers[i].vendorId &&
 823                     product == quirk_printers[i].productId)
 824                         return quirk_printers[i].quirks;
 825         }
 826         return 0;
 827 }
 828
 829 static struct file_operations usblp_fops = {
 830         .owner =        THIS_MODULE,
 831         .read =         usblp_read,
 832         .write =        usblp_write,
 833         .poll =         usblp_poll,
 834         .ioctl =        usblp_ioctl,
 835         .open =         usblp_open,
 836         .release =      usblp_release,
 837 };
 838
 839 static struct usb_class_driver usblp_class = {
 840         .name =         "usb/lp%d",
 841         .fops =         &usblp_fops,
 842         .mode =         S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,
 843         .minor_base =   USBLP_MINOR_BASE,
 844 };
 845
 846 static int usblp_probe(struct usb_interface *intf,
 847                        const struct usb_device_id *id)
 848 {
 849         struct usb_device *dev = interface_to_usbdev (intf);
 850         struct usblp *usblp = NULL;
 851         int protocol;
 852         int retval;
 853
 854         /* Malloc and start initializing usblp structure so we can use it
 855          * directly. */
 856         if (!(usblp = kmalloc(sizeof(struct usblp), GFP_KERNEL))) {
 857                 err("out of memory for usblp");
 858                 goto abort;
 859         }
 860         memset(usblp, 0, sizeof(struct usblp));
 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                 dev->descriptor.idVendor,
 913                 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                         dev->descriptor.idVendor,
 920                         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
 931 #ifdef DEBUG
 932         usblp_check_status(usblp, 0);
 933 #endif
 934
 935         info("usblp%d: USB %sdirectional printer dev %d "
 936                 "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X",
 937                 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
 938                 usblp->ifnum,
 939                 usblp->protocol[usblp->current_protocol].alt_setting,
 940                 usblp->current_protocol, usblp->dev->descriptor.idVendor,
 941                 usblp->dev->descriptor.idProduct);
 942
 943         usb_set_intfdata (intf, usblp);
 944
 945         usblp->present = 1;
 946
 947         retval = usb_register_dev(intf, &usblp_class);
 948         if (retval) {
 949                 err("Not able to get a minor for this device.");
 950                 goto abort_intfdata;
 951         }
 952         usblp->minor = intf->minor;
 953
 954         return 0;
 955
 956 abort_intfdata:
 957         usb_set_intfdata (intf, NULL);
 958 abort:
 959         if (usblp) {
 960                 if (usblp->writebuf)
 961                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 962                                 usblp->writebuf, usblp->writeurb->transfer_dma);
 963                 if (usblp->readbuf)
 964                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 965                                 usblp->readbuf, usblp->writeurb->transfer_dma);
 966                 kfree(usblp->statusbuf);
 967                 kfree(usblp->device_id_string);
 968                 usb_free_urb(usblp->writeurb);
 969                 usb_free_urb(usblp->readurb);
 970                 kfree(usblp);
 971         }
 972         return -EIO;
 973 }
 974
 975 /*
 976  * We are a "new" style driver with usb_device_id table,
 977  * but our requirements are too intricate for simple match to handle.
 978  *
 979  * The "proto_bias" option may be used to specify the preferred protocol
 980  * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3).  If the device
 981  * supports the preferred protocol, then we bind to it.
 982  *
 983  * The best interface for us is 7/1/2, because it is compatible
 984  * with a stream of characters. If we find it, we bind to it.
 985  *
 986  * Note that the people from hpoj.sourceforge.net need to be able to
 987  * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
 988  *
 989  * Failing 7/1/2, we look for 7/1/3, even though it's probably not
 990  * stream-compatible, because this matches the behaviour of the old code.
 991  *
 992  * If nothing else, we bind to 7/1/1 - the unidirectional interface.
 993  */
 994 static int usblp_select_alts(struct usblp *usblp)
 995 {
 996         struct usb_interface *if_alt;
 997         struct usb_host_interface *ifd;
 998         struct usb_endpoint_descriptor *epd, *epwrite, *epread;
 999         int p, i, e;
1000
1001         if_alt = usblp->intf;
1002
1003         for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1004                 usblp->protocol[p].alt_setting = -1;
1005
1006         /* Find out what we have. */
1007         for (i = 0; i < if_alt->num_altsetting; i++) {
1008                 ifd = &if_alt->altsetting[i];
1009
1010                 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
1011                         continue;
1012
1013                 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1014                     ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1015                         continue;
1016
1017                 /* Look for bulk OUT and IN endpoints. */
1018                 epwrite = epread = NULL;
1019                 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1020                         epd = &ifd->endpoint[e].desc;
1021
1022                         if ((epd->bmAttributes&USB_ENDPOINT_XFERTYPE_MASK)!=
1023                             USB_ENDPOINT_XFER_BULK)
1024                                 continue;
1025
1026                         if (!(epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK)) {
1027                                 if (!epwrite)
1028                                         epwrite = epd;
1029
1030                         } else {
1031                                 if (!epread)
1032                                         epread = epd;
1033                         }
1034                 }
1035
1036                 /* Ignore buggy hardware without the right endpoints. */
1037                 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1038                         continue;
1039
1040                 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1041                  * and buggy bidirectional printers. */
1042                 if (ifd->desc.bInterfaceProtocol == 1) {
1043                         epread = NULL;
1044                 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1045                         info("Disabling reads from problem bidirectional "
1046                                 "printer on usblp%d", usblp->minor);
1047                         epread = NULL;
1048                 }
1049
1050                 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1051                                 ifd->desc.bAlternateSetting;
1052                 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1053                 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1054         }
1055
1056         /* If our requested protocol is supported, then use it. */
1057         if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1058             proto_bias <= USBLP_LAST_PROTOCOL &&
1059             usblp->protocol[proto_bias].alt_setting != -1)
1060                 return proto_bias;
1061
1062         /* Ordering is important here. */
1063         if (usblp->protocol[2].alt_setting != -1)
1064                 return 2;
1065         if (usblp->protocol[1].alt_setting != -1)
1066                 return 1;
1067         if (usblp->protocol[3].alt_setting != -1)
1068                 return 3;
1069
1070         /* If nothing is available, then don't bind to this device. */
1071         return -1;
1072 }
1073
1074 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1075 {
1076         int r, alts;
1077
1078         if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1079                 return -EINVAL;
1080
1081         alts = usblp->protocol[protocol].alt_setting;
1082         if (alts < 0)
1083                 return -EINVAL;
1084         r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1085         if (r < 0) {
1086                 err("can't set desired altsetting %d on interface %d",
1087                         alts, usblp->ifnum);
1088                 return r;
1089         }
1090
1091         usb_fill_bulk_urb(usblp->writeurb, usblp->dev,
1092                 usb_sndbulkpipe(usblp->dev,
1093                   usblp->protocol[protocol].epwrite->bEndpointAddress),
1094                 usblp->writebuf, 0,
1095                 usblp_bulk_write, usblp);
1096
1097         usblp->bidir = (usblp->protocol[protocol].epread != 0);
1098         if (usblp->bidir)
1099                 usb_fill_bulk_urb(usblp->readurb, usblp->dev,
1100                         usb_rcvbulkpipe(usblp->dev,
1101                           usblp->protocol[protocol].epread->bEndpointAddress),
1102                         usblp->readbuf, USBLP_BUF_SIZE,
1103                         usblp_bulk_read, usblp);
1104
1105         usblp->current_protocol = protocol;
1106         dbg("usblp%d set protocol %d", usblp->minor, protocol);
1107         return 0;
1108 }
1109
1110 /* Retrieves and caches device ID string.
1111  * Returns length, including length bytes but not null terminator.
1112  * On error, returns a negative errno value. */
1113 static int usblp_cache_device_id_string(struct usblp *usblp)
1114 {
1115         int err, length;
1116
1117         err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1118         if (err < 0) {
1119                 dbg("usblp%d: error = %d reading IEEE-1284 Device ID string",
1120                         usblp->minor, err);
1121                 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1122                 return -EIO;
1123         }
1124
1125         /* First two bytes are length in big-endian.
1126          * They count themselves, and we copy them into
1127          * the user's buffer. */
1128         length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1129         if (length < 2)
1130                 length = 2;
1131         else if (length >= USBLP_DEVICE_ID_SIZE)
1132                 length = USBLP_DEVICE_ID_SIZE - 1;
1133         usblp->device_id_string[length] = '\0';
1134
1135         dbg("usblp%d Device ID string [len=%d]=\"%s\"",
1136                 usblp->minor, length, &usblp->device_id_string[2]);
1137
1138         return length;
1139 }
1140
1141 static void usblp_disconnect(struct usb_interface *intf)
1142 {
1143         struct usblp *usblp = usb_get_intfdata (intf);
1144
1145         usb_deregister_dev(intf, &usblp_class);
1146
1147         if (!usblp || !usblp->dev) {
1148                 err("bogus disconnect");
1149                 BUG ();
1150         }
1151
1152         down (&usblp->sem);
1153         lock_kernel();
1154         usblp->present = 0;
1155         usb_set_intfdata (intf, NULL);
1156
1157         usblp_unlink_urbs(usblp);
1158         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1159                         usblp->writebuf, usblp->writeurb->transfer_dma);
1160         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1161                         usblp->readbuf, usblp->readurb->transfer_dma);
1162
1163         if (!usblp->used)
1164                 usblp_cleanup (usblp);
1165         else    /* cleanup later, on release */
1166                 up (&usblp->sem);
1167         unlock_kernel();
1168 }
1169
1170 static struct usb_device_id usblp_ids [] = {
1171         { USB_DEVICE_INFO(7, 1, 1) },
1172         { USB_DEVICE_INFO(7, 1, 2) },
1173         { USB_DEVICE_INFO(7, 1, 3) },
1174         { USB_INTERFACE_INFO(7, 1, 1) },
1175         { USB_INTERFACE_INFO(7, 1, 2) },
1176         { USB_INTERFACE_INFO(7, 1, 3) },
1177         { }                                             /* Terminating entry */
1178 };
1179
1180 MODULE_DEVICE_TABLE (usb, usblp_ids);
1181
1182 static struct usb_driver usblp_driver = {
1183         .owner =        THIS_MODULE,
1184         .name =         "usblp",
1185         .probe =        usblp_probe,
1186         .disconnect =   usblp_disconnect,
1187         .id_table =     usblp_ids,
1188 };
1189
1190 static int __init usblp_init(void)
1191 {
1192         int retval;
1193         retval = usb_register(&usblp_driver);
1194         if (retval)
1195                 goto out;
1196         info(DRIVER_VERSION ": " DRIVER_DESC);
1197 out:
1198         return retval;
1199 }
1200
1201 static void __exit usblp_exit(void)
1202 {
1203         usb_deregister(&usblp_driver);
1204 }
1205
1206 module_init(usblp_init);
1207 module_exit(usblp_exit);
1208
1209 MODULE_AUTHOR( DRIVER_AUTHOR );
1210 MODULE_DESCRIPTION( DRIVER_DESC );
1211 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1212 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1213 MODULE_LICENSE("GPL");