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
 383         if (usblp->bidir) {
 384                 usblp->readcount = 0;
 385                 usblp->readurb->dev = usblp->dev;
 386                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) {
 387                         retval = -EIO;
 388                         usblp->used = 0;
 389                         file->private_data = NULL;
 390                 }
 391         }
 392 out:
 393         up (&usblp_sem);
 394         return retval;
 395 }
 396
 397 static void usblp_cleanup (struct usblp *usblp)
 398 {
 399         info("usblp%d: removed", usblp->minor);
 400
 401         kfree (usblp->device_id_string);
 402         kfree (usblp->statusbuf);
 403         usb_free_urb(usblp->writeurb);
 404         usb_free_urb(usblp->readurb);
 405         kfree (usblp);
 406 }
 407
 408 static void usblp_unlink_urbs(struct usblp *usblp)
 409 {
 410         usb_kill_urb(usblp->writeurb);
 411         if (usblp->bidir)
 412                 usb_kill_urb(usblp->readurb);
 413 }
 414
 415 static int usblp_release(struct inode *inode, struct file *file)
 416 {
 417         struct usblp *usblp = file->private_data;
 418
 419         down (&usblp_sem);
 420         usblp->used = 0;
 421         if (usblp->present) {
 422                 usblp_unlink_urbs(usblp);
 423         } else          /* finish cleanup from disconnect */
 424                 usblp_cleanup (usblp);
 425         up (&usblp_sem);
 426         return 0;
 427 }
 428
 429 /* No kernel lock - fine */
 430 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
 431 {
 432         struct usblp *usblp = file->private_data;
 433         poll_wait(file, &usblp->wait, wait);
 434         return ((!usblp->bidir || !usblp->rcomplete) ? 0 : POLLIN  | POLLRDNORM)
 435                                | (!usblp->wcomplete ? 0 : POLLOUT | POLLWRNORM);
 436 }
 437
 438 static int usblp_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 439 {
 440         struct usblp *usblp = file->private_data;
 441         int length, err, i;
 442         unsigned char newChannel;
 443         int status;
 444         int twoints[2];
 445         int retval = 0;
 446
 447         down (&usblp->sem);
 448         if (!usblp->present) {
 449                 retval = -ENODEV;
 450                 goto done;
 451         }
 452
 453         dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd),
 454                 _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd) );
 455
 456         if (_IOC_TYPE(cmd) == 'P')      /* new-style ioctl number */
 457
 458                 switch (_IOC_NR(cmd)) {
 459
 460                         case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
 461                                 if (_IOC_DIR(cmd) != _IOC_READ) {
 462                                         retval = -EINVAL;
 463                                         goto done;
 464                                 }
 465
 466                                 length = usblp_cache_device_id_string(usblp);
 467                                 if (length < 0) {
 468                                         retval = length;
 469                                         goto done;
 470                                 }
 471                                 if (length > _IOC_SIZE(cmd))
 472                                         length = _IOC_SIZE(cmd); /* truncate */
 473
 474                                 if (copy_to_user((void __user *) arg,
 475                                                 usblp->device_id_string,
 476                                                 (unsigned long) length)) {
 477                                         retval = -EFAULT;
 478                                         goto done;
 479                                 }
 480
 481                                 break;
 482
 483                         case IOCNR_GET_PROTOCOLS:
 484                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 485                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 486                                         retval = -EINVAL;
 487                                         goto done;
 488                                 }
 489
 490                                 twoints[0] = usblp->current_protocol;
 491                                 twoints[1] = 0;
 492                                 for (i = USBLP_FIRST_PROTOCOL;
 493                                      i <= USBLP_LAST_PROTOCOL; i++) {
 494                                         if (usblp->protocol[i].alt_setting >= 0)
 495                                                 twoints[1] |= (1<<i);
 496                                 }
 497
 498                                 if (copy_to_user((void __user *)arg,
 499                                                 (unsigned char *)twoints,
 500                                                 sizeof(twoints))) {
 501                                         retval = -EFAULT;
 502                                         goto done;
 503                                 }
 504
 505                                 break;
 506
 507                         case IOCNR_SET_PROTOCOL:
 508                                 if (_IOC_DIR(cmd) != _IOC_WRITE) {
 509                                         retval = -EINVAL;
 510                                         goto done;
 511                                 }
 512
 513 #ifdef DEBUG
 514                                 if (arg == -10) {
 515                                         usblp_dump(usblp);
 516                                         break;
 517                                 }
 518 #endif
 519
 520                                 usblp_unlink_urbs(usblp);
 521                                 retval = usblp_set_protocol(usblp, arg);
 522                                 if (retval < 0) {
 523                                         usblp_set_protocol(usblp,
 524                                                 usblp->current_protocol);
 525                                 }
 526                                 break;
 527
 528                         case IOCNR_HP_SET_CHANNEL:
 529                                 if (_IOC_DIR(cmd) != _IOC_WRITE ||
 530                                     le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
 531                                     usblp->quirks & USBLP_QUIRK_BIDIR) {
 532                                         retval = -EINVAL;
 533                                         goto done;
 534                                 }
 535
 536                                 err = usblp_hp_channel_change_request(usblp,
 537                                         arg, &newChannel);
 538                                 if (err < 0) {
 539                                         err("usblp%d: error = %d setting "
 540                                                 "HP channel",
 541                                                 usblp->minor, err);
 542                                         retval = -EIO;
 543                                         goto done;
 544                                 }
 545
 546                                 dbg("usblp%d requested/got HP channel %ld/%d",
 547                                         usblp->minor, arg, newChannel);
 548                                 break;
 549
 550                         case IOCNR_GET_BUS_ADDRESS:
 551                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 552                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 553                                         retval = -EINVAL;
 554                                         goto done;
 555                                 }
 556
 557                                 twoints[0] = usblp->dev->bus->busnum;
 558                                 twoints[1] = usblp->dev->devnum;
 559                                 if (copy_to_user((void __user *)arg,
 560                                                 (unsigned char *)twoints,
 561                                                 sizeof(twoints))) {
 562                                         retval = -EFAULT;
 563                                         goto done;
 564                                 }
 565
 566                                 dbg("usblp%d is bus=%d, device=%d",
 567                                         usblp->minor, twoints[0], twoints[1]);
 568                                 break;
 569
 570                         case IOCNR_GET_VID_PID:
 571                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 572                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 573                                         retval = -EINVAL;
 574                                         goto done;
 575                                 }
 576
 577                                 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
 578                                 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
 579                                 if (copy_to_user((void __user *)arg,
 580                                                 (unsigned char *)twoints,
 581                                                 sizeof(twoints))) {
 582                                         retval = -EFAULT;
 583                                         goto done;
 584                                 }
 585
 586                                 dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X",
 587                                         usblp->minor, twoints[0], twoints[1]);
 588                                 break;
 589
 590                         case IOCNR_SOFT_RESET:
 591                                 if (_IOC_DIR(cmd) != _IOC_NONE) {
 592                                         retval = -EINVAL;
 593                                         goto done;
 594                                 }
 595                                 retval = usblp_reset(usblp);
 596                                 break;
 597                         default:
 598                                 retval = -ENOTTY;
 599                 }
 600         else    /* old-style ioctl value */
 601                 switch (cmd) {
 602
 603                         case LPGETSTATUS:
 604                                 if (usblp_read_status(usblp, usblp->statusbuf)) {
 605                                         err("usblp%d: failed reading printer status", usblp->minor);
 606                                         retval = -EIO;
 607                                         goto done;
 608                                 }
 609                                 status = *usblp->statusbuf;
 610                                 if (copy_to_user ((void __user *)arg, &status, sizeof(int)))
 611                                         retval = -EFAULT;
 612                                 break;
 613
 614                         default:
 615                                 retval = -ENOTTY;
 616                 }
 617
 618 done:
 619         up (&usblp->sem);
 620         return retval;
 621 }
 622
 623 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 624 {
 625         DECLARE_WAITQUEUE(wait, current);
 626         struct usblp *usblp = file->private_data;
 627         int timeout, err = 0, transfer_length = 0;
 628         size_t writecount = 0;
 629
 630         while (writecount < count) {
 631                 if (!usblp->wcomplete) {
 632                         barrier();
 633                         if (file->f_flags & O_NONBLOCK) {
 634                                 writecount += transfer_length;
 635                                 return writecount ? writecount : -EAGAIN;
 636                         }
 637
 638                         timeout = USBLP_WRITE_TIMEOUT;
 639                         add_wait_queue(&usblp->wait, &wait);
 640                         while ( 1==1 ) {
 641
 642                                 if (signal_pending(current)) {
 643                                         remove_wait_queue(&usblp->wait, &wait);
 644                                         return writecount ? writecount : -EINTR;
 645                                 }
 646                                 set_current_state(TASK_INTERRUPTIBLE);
 647                                 if (timeout && !usblp->wcomplete) {
 648                                         timeout = schedule_timeout(timeout);
 649                                 } else {
 650                                         set_current_state(TASK_RUNNING);
 651                                         break;
 652                                 }
 653                         }
 654                         remove_wait_queue(&usblp->wait, &wait);
 655                 }
 656
 657                 down (&usblp->sem);
 658                 if (!usblp->present) {
 659                         up (&usblp->sem);
 660                         return -ENODEV;
 661                 }
 662
 663                 if (usblp->writeurb->status != 0) {
 664                         if (usblp->quirks & USBLP_QUIRK_BIDIR) {
 665                                 if (!usblp->wcomplete)
 666                                         err("usblp%d: error %d writing to printer",
 667                                                 usblp->minor, usblp->writeurb->status);
 668                                 err = usblp->writeurb->status;
 669                         } else
 670                                 err = usblp_check_status(usblp, err);
 671                         up (&usblp->sem);
 672
 673                         /* if the fault was due to disconnect, let khubd's
 674                          * call to usblp_disconnect() grab usblp->sem ...
 675                          */
 676                         schedule ();
 677                         continue;
 678                 }
 679
 680                 /* We must increment writecount here, and not at the
 681                  * end of the loop. Otherwise, the final loop iteration may
 682                  * be skipped, leading to incomplete printer output.
 683                  */
 684                 writecount += transfer_length;
 685                 if (writecount == count) {
 686                         up(&usblp->sem);
 687                         break;
 688                 }
 689
 690                 transfer_length=(count - writecount);
 691                 if (transfer_length > USBLP_BUF_SIZE)
 692                         transfer_length = USBLP_BUF_SIZE;
 693
 694                 usblp->writeurb->transfer_buffer_length = transfer_length;
 695
 696                 if (copy_from_user(usblp->writeurb->transfer_buffer,
 697                                    buffer + writecount, transfer_length)) {
 698                         up(&usblp->sem);
 699                         return writecount ? writecount : -EFAULT;
 700                 }
 701
 702                 usblp->writeurb->dev = usblp->dev;
 703                 usblp->wcomplete = 0;
 704                 err = usb_submit_urb(usblp->writeurb, GFP_KERNEL);
 705                 if (err) {
 706                         if (err != -ENOMEM)
 707                                 count = -EIO;
 708                         else
 709                                 count = writecount ? writecount : -ENOMEM;
 710                         up (&usblp->sem);
 711                         break;
 712                 }
 713                 up (&usblp->sem);
 714         }
 715
 716         return count;
 717 }
 718
 719 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 720 {
 721         struct usblp *usblp = file->private_data;
 722         DECLARE_WAITQUEUE(wait, current);
 723
 724         if (!usblp->bidir)
 725                 return -EINVAL;
 726
 727         down (&usblp->sem);
 728         if (!usblp->present) {
 729                 count = -ENODEV;
 730                 goto done;
 731         }
 732
 733         if (!usblp->rcomplete) {
 734                 barrier();
 735
 736                 if (file->f_flags & O_NONBLOCK) {
 737                         count = -EAGAIN;
 738                         goto done;
 739                 }
 740
 741                 add_wait_queue(&usblp->wait, &wait);
 742                 while (1==1) {
 743                         if (signal_pending(current)) {
 744                                 count = -EINTR;
 745                                 remove_wait_queue(&usblp->wait, &wait);
 746                                 goto done;
 747                         }
 748                         up (&usblp->sem);
 749                         set_current_state(TASK_INTERRUPTIBLE);
 750                         if (!usblp->rcomplete) {
 751                                 schedule();
 752                         } else {
 753                                 set_current_state(TASK_RUNNING);
 754                                 break;
 755                         }
 756                         down (&usblp->sem);
 757                 }
 758                 remove_wait_queue(&usblp->wait, &wait);
 759         }
 760
 761         if (!usblp->present) {
 762                 count = -ENODEV;
 763                 goto done;
 764         }
 765
 766         if (usblp->readurb->status) {
 767                 err("usblp%d: error %d reading from printer",
 768                         usblp->minor, usblp->readurb->status);
 769                 usblp->readurb->dev = usblp->dev;
 770                 usblp->readcount = 0;
 771                 usblp->rcomplete = 0;
 772                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0)
 773                         dbg("error submitting urb");
 774                 count = -EIO;
 775                 goto done;
 776         }
 777
 778         count = count < usblp->readurb->actual_length - usblp->readcount ?
 779                 count : usblp->readurb->actual_length - usblp->readcount;
 780
 781         if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) {
 782                 count = -EFAULT;
 783                 goto done;
 784         }
 785
 786         if ((usblp->readcount += count) == usblp->readurb->actual_length) {
 787                 usblp->readcount = 0;
 788                 usblp->readurb->dev = usblp->dev;
 789                 usblp->rcomplete = 0;
 790                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL)) {
 791                         count = -EIO;
 792                         goto done;
 793                 }
 794         }
 795
 796 done:
 797         up (&usblp->sem);
 798         return count;
 799 }
 800
 801 /*
 802  * Checks for printers that have quirks, such as requiring unidirectional
 803  * communication but reporting bidirectional; currently some HP printers
 804  * have this flaw (HP 810, 880, 895, etc.), or needing an init string
 805  * sent at each open (like some Epsons).
 806  * Returns 1 if found, 0 if not found.
 807  *
 808  * HP recommended that we use the bidirectional interface but
 809  * don't attempt any bulk IN transfers from the IN endpoint.
 810  * Here's some more detail on the problem:
 811  * The problem is not that it isn't bidirectional though. The problem
 812  * is that if you request a device ID, or status information, while
 813  * the buffers are full, the return data will end up in the print data
 814  * buffer. For example if you make sure you never request the device ID
 815  * while you are sending print data, and you don't try to query the
 816  * printer status every couple of milliseconds, you will probably be OK.
 817  */
 818 static unsigned int usblp_quirks (__u16 vendor, __u16 product)
 819 {
 820         int i;
 821
 822         for (i = 0; quirk_printers[i].vendorId; i++) {
 823                 if (vendor == quirk_printers[i].vendorId &&
 824                     product == quirk_printers[i].productId)
 825                         return quirk_printers[i].quirks;
 826         }
 827         return 0;
 828 }
 829
 830 static struct file_operations usblp_fops = {
 831         .owner =        THIS_MODULE,
 832         .read =         usblp_read,
 833         .write =        usblp_write,
 834         .poll =         usblp_poll,
 835         .ioctl =        usblp_ioctl,
 836         .open =         usblp_open,
 837         .release =      usblp_release,
 838 };
 839
 840 static struct usb_class_driver usblp_class = {
 841         .name =         "usb/lp%d",
 842         .fops =         &usblp_fops,
 843         .mode =         S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,
 844         .minor_base =   USBLP_MINOR_BASE,
 845 };
 846
 847 static int usblp_probe(struct usb_interface *intf,
 848                        const struct usb_device_id *id)
 849 {
 850         struct usb_device *dev = interface_to_usbdev (intf);
 851         struct usblp *usblp = NULL;
 852         int protocol;
 853         int retval;
 854
 855         /* Malloc and start initializing usblp structure so we can use it
 856          * directly. */
 857         if (!(usblp = kmalloc(sizeof(struct usblp), GFP_KERNEL))) {
 858                 err("out of memory for usblp");
 859                 goto abort;
 860         }
 861         memset(usblp, 0, sizeof(struct usblp));
 862         usblp->dev = dev;
 863         init_MUTEX (&usblp->sem);
 864         init_waitqueue_head(&usblp->wait);
 865         usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
 866         usblp->intf = intf;
 867
 868         usblp->writeurb = usb_alloc_urb(0, GFP_KERNEL);
 869         if (!usblp->writeurb) {
 870                 err("out of memory");
 871                 goto abort;
 872         }
 873         usblp->readurb = usb_alloc_urb(0, GFP_KERNEL);
 874         if (!usblp->readurb) {
 875                 err("out of memory");
 876                 goto abort;
 877         }
 878
 879         /* Malloc device ID string buffer to the largest expected length,
 880          * since we can re-query it on an ioctl and a dynamic string
 881          * could change in length. */
 882         if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
 883                 err("out of memory for device_id_string");
 884                 goto abort;
 885         }
 886
 887         usblp->writebuf = usblp->readbuf = NULL;
 888         usblp->writeurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 889         usblp->readurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 890         /* Malloc write & read buffers.  We somewhat wastefully
 891          * malloc both regardless of bidirectionality, because the
 892          * alternate setting can be changed later via an ioctl. */
 893         if (!(usblp->writebuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
 894                                 GFP_KERNEL, &usblp->writeurb->transfer_dma))) {
 895                 err("out of memory for write buf");
 896                 goto abort;
 897         }
 898         if (!(usblp->readbuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
 899                                 GFP_KERNEL, &usblp->readurb->transfer_dma))) {
 900                 err("out of memory for read buf");
 901                 goto abort;
 902         }
 903
 904         /* Allocate buffer for printer status */
 905         usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
 906         if (!usblp->statusbuf) {
 907                 err("out of memory for statusbuf");
 908                 goto abort;
 909         }
 910
 911         /* Lookup quirks for this printer. */
 912         usblp->quirks = usblp_quirks(
 913                 le16_to_cpu(dev->descriptor.idVendor),
 914                 le16_to_cpu(dev->descriptor.idProduct));
 915
 916         /* Analyze and pick initial alternate settings and endpoints. */
 917         protocol = usblp_select_alts(usblp);
 918         if (protocol < 0) {
 919                 dbg("incompatible printer-class device 0x%4.4X/0x%4.4X",
 920                         le16_to_cpu(dev->descriptor.idVendor),
 921                         le16_to_cpu(dev->descriptor.idProduct));
 922                 goto abort;
 923         }
 924
 925         /* Setup the selected alternate setting and endpoints. */
 926         if (usblp_set_protocol(usblp, protocol) < 0)
 927                 goto abort;
 928
 929         /* Retrieve and store the device ID string. */
 930         usblp_cache_device_id_string(usblp);
 931
 932 #ifdef DEBUG
 933         usblp_check_status(usblp, 0);
 934 #endif
 935
 936         info("usblp%d: USB %sdirectional printer dev %d "
 937                 "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X",
 938                 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
 939                 usblp->ifnum,
 940                 usblp->protocol[usblp->current_protocol].alt_setting,
 941                 usblp->current_protocol,
 942                 le16_to_cpu(usblp->dev->descriptor.idVendor),
 943                 le16_to_cpu(usblp->dev->descriptor.idProduct));
 944
 945         usb_set_intfdata (intf, usblp);
 946
 947         usblp->present = 1;
 948
 949         retval = usb_register_dev(intf, &usblp_class);
 950         if (retval) {
 951                 err("Not able to get a minor for this device.");
 952                 goto abort_intfdata;
 953         }
 954         usblp->minor = intf->minor;
 955
 956         return 0;
 957
 958 abort_intfdata:
 959         usb_set_intfdata (intf, NULL);
 960 abort:
 961         if (usblp) {
 962                 if (usblp->writebuf)
 963                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 964                                 usblp->writebuf, usblp->writeurb->transfer_dma);
 965                 if (usblp->readbuf)
 966                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 967                                 usblp->readbuf, usblp->writeurb->transfer_dma);
 968                 kfree(usblp->statusbuf);
 969                 kfree(usblp->device_id_string);
 970                 usb_free_urb(usblp->writeurb);
 971                 usb_free_urb(usblp->readurb);
 972                 kfree(usblp);
 973         }
 974         return -EIO;
 975 }
 976
 977 /*
 978  * We are a "new" style driver with usb_device_id table,
 979  * but our requirements are too intricate for simple match to handle.
 980  *
 981  * The "proto_bias" option may be used to specify the preferred protocol
 982  * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3).  If the device
 983  * supports the preferred protocol, then we bind to it.
 984  *
 985  * The best interface for us is 7/1/2, because it is compatible
 986  * with a stream of characters. If we find it, we bind to it.
 987  *
 988  * Note that the people from hpoj.sourceforge.net need to be able to
 989  * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
 990  *
 991  * Failing 7/1/2, we look for 7/1/3, even though it's probably not
 992  * stream-compatible, because this matches the behaviour of the old code.
 993  *
 994  * If nothing else, we bind to 7/1/1 - the unidirectional interface.
 995  */
 996 static int usblp_select_alts(struct usblp *usblp)
 997 {
 998         struct usb_interface *if_alt;
 999         struct usb_host_interface *ifd;
1000         struct usb_endpoint_descriptor *epd, *epwrite, *epread;
1001         int p, i, e;
1002
1003         if_alt = usblp->intf;
1004
1005         for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1006                 usblp->protocol[p].alt_setting = -1;
1007
1008         /* Find out what we have. */
1009         for (i = 0; i < if_alt->num_altsetting; i++) {
1010                 ifd = &if_alt->altsetting[i];
1011
1012                 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
1013                         continue;
1014
1015                 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1016                     ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1017                         continue;
1018
1019                 /* Look for bulk OUT and IN endpoints. */
1020                 epwrite = epread = NULL;
1021                 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1022                         epd = &ifd->endpoint[e].desc;
1023
1024                         if ((epd->bmAttributes&USB_ENDPOINT_XFERTYPE_MASK)!=
1025                             USB_ENDPOINT_XFER_BULK)
1026                                 continue;
1027
1028                         if (!(epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK)) {
1029                                 if (!epwrite)
1030                                         epwrite = epd;
1031
1032                         } else {
1033                                 if (!epread)
1034                                         epread = epd;
1035                         }
1036                 }
1037
1038                 /* Ignore buggy hardware without the right endpoints. */
1039                 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1040                         continue;
1041
1042                 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1043                  * and buggy bidirectional printers. */
1044                 if (ifd->desc.bInterfaceProtocol == 1) {
1045                         epread = NULL;
1046                 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1047                         info("Disabling reads from problem bidirectional "
1048                                 "printer on usblp%d", usblp->minor);
1049                         epread = NULL;
1050                 }
1051
1052                 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1053                                 ifd->desc.bAlternateSetting;
1054                 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1055                 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1056         }
1057
1058         /* If our requested protocol is supported, then use it. */
1059         if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1060             proto_bias <= USBLP_LAST_PROTOCOL &&
1061             usblp->protocol[proto_bias].alt_setting != -1)
1062                 return proto_bias;
1063
1064         /* Ordering is important here. */
1065         if (usblp->protocol[2].alt_setting != -1)
1066                 return 2;
1067         if (usblp->protocol[1].alt_setting != -1)
1068                 return 1;
1069         if (usblp->protocol[3].alt_setting != -1)
1070                 return 3;
1071
1072         /* If nothing is available, then don't bind to this device. */
1073         return -1;
1074 }
1075
1076 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1077 {
1078         int r, alts;
1079
1080         if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1081                 return -EINVAL;
1082
1083         alts = usblp->protocol[protocol].alt_setting;
1084         if (alts < 0)
1085                 return -EINVAL;
1086         r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1087         if (r < 0) {
1088                 err("can't set desired altsetting %d on interface %d",
1089                         alts, usblp->ifnum);
1090                 return r;
1091         }
1092
1093         usb_fill_bulk_urb(usblp->writeurb, usblp->dev,
1094                 usb_sndbulkpipe(usblp->dev,
1095                   usblp->protocol[protocol].epwrite->bEndpointAddress),
1096                 usblp->writebuf, 0,
1097                 usblp_bulk_write, usblp);
1098
1099         usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1100         if (usblp->bidir)
1101                 usb_fill_bulk_urb(usblp->readurb, usblp->dev,
1102                         usb_rcvbulkpipe(usblp->dev,
1103                           usblp->protocol[protocol].epread->bEndpointAddress),
1104                         usblp->readbuf, USBLP_BUF_SIZE,
1105                         usblp_bulk_read, usblp);
1106
1107         usblp->current_protocol = protocol;
1108         dbg("usblp%d set protocol %d", usblp->minor, protocol);
1109         return 0;
1110 }
1111
1112 /* Retrieves and caches device ID string.
1113  * Returns length, including length bytes but not null terminator.
1114  * On error, returns a negative errno value. */
1115 static int usblp_cache_device_id_string(struct usblp *usblp)
1116 {
1117         int err, length;
1118
1119         err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1120         if (err < 0) {
1121                 dbg("usblp%d: error = %d reading IEEE-1284 Device ID string",
1122                         usblp->minor, err);
1123                 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1124                 return -EIO;
1125         }
1126
1127         /* First two bytes are length in big-endian.
1128          * They count themselves, and we copy them into
1129          * the user's buffer. */
1130         length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1131         if (length < 2)
1132                 length = 2;
1133         else if (length >= USBLP_DEVICE_ID_SIZE)
1134                 length = USBLP_DEVICE_ID_SIZE - 1;
1135         usblp->device_id_string[length] = '\0';
1136
1137         dbg("usblp%d Device ID string [len=%d]=\"%s\"",
1138                 usblp->minor, length, &usblp->device_id_string[2]);
1139
1140         return length;
1141 }
1142
1143 static void usblp_disconnect(struct usb_interface *intf)
1144 {
1145         struct usblp *usblp = usb_get_intfdata (intf);
1146
1147         usb_deregister_dev(intf, &usblp_class);
1148
1149         if (!usblp || !usblp->dev) {
1150                 err("bogus disconnect");
1151                 BUG ();
1152         }
1153
1154         down (&usblp_sem);
1155         down (&usblp->sem);
1156         usblp->present = 0;
1157         usb_set_intfdata (intf, NULL);
1158
1159         usblp_unlink_urbs(usblp);
1160         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1161                         usblp->writebuf, usblp->writeurb->transfer_dma);
1162         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1163                         usblp->readbuf, usblp->readurb->transfer_dma);
1164         up (&usblp->sem);
1165
1166         if (!usblp->used)
1167                 usblp_cleanup (usblp);
1168         up (&usblp_sem);
1169 }
1170
1171 static struct usb_device_id usblp_ids [] = {
1172         { USB_DEVICE_INFO(7, 1, 1) },
1173         { USB_DEVICE_INFO(7, 1, 2) },
1174         { USB_DEVICE_INFO(7, 1, 3) },
1175         { USB_INTERFACE_INFO(7, 1, 1) },
1176         { USB_INTERFACE_INFO(7, 1, 2) },
1177         { USB_INTERFACE_INFO(7, 1, 3) },
1178         { }                                             /* Terminating entry */
1179 };
1180
1181 MODULE_DEVICE_TABLE (usb, usblp_ids);
1182
1183 static struct usb_driver usblp_driver = {
1184         .owner =        THIS_MODULE,
1185         .name =         "usblp",
1186         .probe =        usblp_probe,
1187         .disconnect =   usblp_disconnect,
1188         .id_table =     usblp_ids,
1189 };
1190
1191 static int __init usblp_init(void)
1192 {
1193         int retval;
1194         retval = usb_register(&usblp_driver);
1195         if (retval)
1196                 goto out;
1197         info(DRIVER_VERSION ": " DRIVER_DESC);
1198 out:
1199         return retval;
1200 }
1201
1202 static void __exit usblp_exit(void)
1203 {
1204         usb_deregister(&usblp_driver);
1205 }
1206
1207 module_init(usblp_init);
1208 module_exit(usblp_exit);
1209
1210 MODULE_AUTHOR( DRIVER_AUTHOR );
1211 MODULE_DESCRIPTION( DRIVER_DESC );
1212 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1213 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1214 MODULE_LICENSE("GPL");