drivers/usb/class/usblp.c

   1 /*
   2  * usblp.c  Version 0.13
   3  *
   4  * Copyright (c) 1999 Michael Gee       <michael@linuxspecific.com>
   5  * Copyright (c) 1999 Pavel Machek      <pavel@suse.cz>
   6  * Copyright (c) 2000 Randy Dunlap      <rddunlap@osdl.org>
   7  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
   8  # Copyright (c) 2001 Pete Zaitcev      <zaitcev@redhat.com>
   9  # Copyright (c) 2001 David Paschal     <paschal@rcsis.com>
  10  *
  11  * USB Printer Device Class driver for USB printers and printer cables
  12  *
  13  * Sponsored by SuSE
  14  *
  15  * ChangeLog:
  16  *      v0.1 - thorough cleaning, URBification, almost a rewrite
  17  *      v0.2 - some more cleanups
  18  *      v0.3 - cleaner again, waitqueue fixes
  19  *      v0.4 - fixes in unidirectional mode
  20  *      v0.5 - add DEVICE_ID string support
  21  *      v0.6 - never time out
  22  *      v0.7 - fixed bulk-IN read and poll (David Paschal)
  23  *      v0.8 - add devfs support
  24  *      v0.9 - fix unplug-while-open paths
  25  *      v0.10- remove sleep_on, fix error on oom (oliver@neukum.org)
  26  *      v0.11 - add proto_bias option (Pete Zaitcev)
  27  *      v0.12 - add hpoj.sourceforge.net ioctls (David Paschal)
  28  *      v0.13 - alloc space for statusbuf (<status> not on stack);
  29  *              use usb_buffer_alloc() for read buf & write buf;
  30  */
  31
  32 /*
  33  * This program is free software; you can redistribute it and/or modify
  34  * it under the terms of the GNU General Public License as published by
  35  * the Free Software Foundation; either version 2 of the License, or
  36  * (at your option) any later version.
  37  *
  38  * This program is distributed in the hope that it will be useful,
  39  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  40  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  41  * GNU General Public License for more details.
  42  *
  43  * You should have received a copy of the GNU General Public License
  44  * along with this program; if not, write to the Free Software
  45  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  46  */
  47
  48 #include <linux/module.h>
  49 #include <linux/kernel.h>
  50 #include <linux/sched.h>
  51 #include <linux/smp_lock.h>
  52 #include <linux/signal.h>
  53 #include <linux/poll.h>
  54 #include <linux/init.h>
  55 #include <linux/slab.h>
  56 #include <linux/lp.h>
  57 #undef DEBUG
  58 #include <linux/usb.h>
  59
  60 /*
  61  * Version Information
  62  */
  63 #define DRIVER_VERSION "v0.13"
  64 #define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal"
  65 #define DRIVER_DESC "USB Printer Device Class driver"
  66
  67 #define USBLP_BUF_SIZE          8192
  68 #define USBLP_DEVICE_ID_SIZE    1024
  69
  70 /* ioctls: */
  71 #define LPGETSTATUS             0x060b          /* same as in drivers/char/lp.c */
  72 #define IOCNR_GET_DEVICE_ID             1
  73 #define IOCNR_GET_PROTOCOLS             2
  74 #define IOCNR_SET_PROTOCOL              3
  75 #define IOCNR_HP_SET_CHANNEL            4
  76 #define IOCNR_GET_BUS_ADDRESS           5
  77 #define IOCNR_GET_VID_PID               6
  78 /* Get device_id string: */
  79 #define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len)
  80 /* The following ioctls were added for http://hpoj.sourceforge.net: */
  81 /* Get two-int array:
  82  * [0]=current protocol (1=7/1/1, 2=7/1/2, 3=7/1/3),
  83  * [1]=supported protocol mask (mask&(1<<n)!=0 means 7/1/n supported): */
  84 #define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
  85 /* Set protocol (arg: 1=7/1/1, 2=7/1/2, 3=7/1/3): */
  86 #define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0)
  87 /* Set channel number (HP Vendor-specific command): */
  88 #define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0)
  89 /* Get two-int array: [0]=bus number, [1]=device address: */
  90 #define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len)
  91 /* Get two-int array: [0]=vendor ID, [1]=product ID: */
  92 #define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len)
  93
  94 /*
  95  * A DEVICE_ID string may include the printer's serial number.
  96  * It should end with a semi-colon (';').
  97  * An example from an HP 970C DeskJet printer is (this is one long string,
  98  * with the serial number changed):
  99 MFG:HEWLETT-PACKARD;MDL:DESKJET 970C;CMD:MLC,PCL,PML;CLASS:PRINTER;DESCRIPTION:Hewlett-Packard DeskJet 970C;SERN:US970CSEPROF;VSTATUS:$HB0$NC0,ff,DN,IDLE,CUT,K1,C0,DP,NR,KP000,CP027;VP:0800,FL,B0;VJ:                    ;
 100  */
 101
 102 /*
 103  * USB Printer Requests
 104  */
 105
 106 #define USBLP_REQ_GET_ID                        0x00
 107 #define USBLP_REQ_GET_STATUS                    0x01
 108 #define USBLP_REQ_RESET                         0x02
 109 #define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST     0x00    /* HP Vendor-specific */
 110
 111 #define USBLP_MINORS            16
 112 #define USBLP_MINOR_BASE        0
 113
 114 #define USBLP_WRITE_TIMEOUT     (5*HZ)                  /* 5 seconds */
 115
 116 #define USBLP_FIRST_PROTOCOL    1
 117 #define USBLP_LAST_PROTOCOL     3
 118 #define USBLP_MAX_PROTOCOLS     (USBLP_LAST_PROTOCOL+1)
 119
 120 /*
 121  * some arbitrary status buffer size;
 122  * need a status buffer that is allocated via kmalloc(), not on stack
 123  */
 124 #define STATUS_BUF_SIZE         8
 125
 126 struct usblp {
 127         struct usb_device       *dev;                   /* USB device */
 128         struct semaphore        sem;                    /* locks this struct, especially "dev" */
 129         char                    *writebuf;              /* write transfer_buffer */
 130         char                    *readbuf;               /* read transfer_buffer */
 131         char                    *statusbuf;             /* status transfer_buffer */
 132         struct urb              *readurb, *writeurb;    /* The urbs */
 133         wait_queue_head_t       wait;                   /* Zzzzz ... */
 134         int                     readcount;              /* Counter for reads */
 135         int                     ifnum;                  /* Interface number */
 136         struct usb_interface    *intf;                  /* The interface */
 137         /* Alternate-setting numbers and endpoints for each protocol
 138          * (7/1/{index=1,2,3}) that the device supports: */
 139         struct {
 140                 int                             alt_setting;
 141                 struct usb_endpoint_descriptor  *epwrite;
 142                 struct usb_endpoint_descriptor  *epread;
 143         }                       protocol[USBLP_MAX_PROTOCOLS];
 144         int                     current_protocol;
 145         int                     minor;                  /* minor number of device */
 146         int                     wcomplete;              /* writing is completed */
 147         int                     rcomplete;              /* reading is completed */
 148         unsigned int            quirks;                 /* quirks flags */
 149         unsigned char           used;                   /* True if open */
 150         unsigned char           present;                /* True if not disconnected */
 151         unsigned char           bidir;                  /* interface is bidirectional */
 152         unsigned char           *device_id_string;      /* IEEE 1284 DEVICE ID string (ptr) */
 153                                                         /* first 2 bytes are (big-endian) length */
 154 };
 155
 156 #ifdef DEBUG
 157 static void usblp_dump(struct usblp *usblp) {
 158         int p;
 159
 160         dbg("usblp=0x%p", usblp);
 161         dbg("dev=0x%p", usblp->dev);
 162         dbg("present=%d", usblp->present);
 163         dbg("readbuf=0x%p", usblp->readbuf);
 164         dbg("writebuf=0x%p", usblp->writebuf);
 165         dbg("readurb=0x%p", usblp->readurb);
 166         dbg("writeurb=0x%p", usblp->writeurb);
 167         dbg("readcount=%d", usblp->readcount);
 168         dbg("ifnum=%d", usblp->ifnum);
 169     for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
 170         dbg("protocol[%d].alt_setting=%d", p, usblp->protocol[p].alt_setting);
 171         dbg("protocol[%d].epwrite=%p", p, usblp->protocol[p].epwrite);
 172         dbg("protocol[%d].epread=%p", p, usblp->protocol[p].epread);
 173     }
 174         dbg("current_protocol=%d", usblp->current_protocol);
 175         dbg("minor=%d", usblp->minor);
 176         dbg("wcomplete=%d", usblp->wcomplete);
 177         dbg("rcomplete=%d", usblp->rcomplete);
 178         dbg("quirks=%d", usblp->quirks);
 179         dbg("used=%d", usblp->used);
 180         dbg("bidir=%d", usblp->bidir);
 181         dbg("device_id_string=\"%s\"",
 182                 usblp->device_id_string ?
 183                         usblp->device_id_string + 2 :
 184                         (unsigned char *)"(null)");
 185 }
 186 #endif
 187
 188 /* Quirks: various printer quirks are handled by this table & its flags. */
 189
 190 struct quirk_printer_struct {
 191         __u16 vendorId;
 192         __u16 productId;
 193         unsigned int quirks;
 194 };
 195
 196 #define USBLP_QUIRK_BIDIR       0x1     /* reports bidir but requires unidirectional mode (no INs/reads) */
 197 #define USBLP_QUIRK_USB_INIT    0x2     /* needs vendor USB init string */
 198
 199 static struct quirk_printer_struct quirk_printers[] = {
 200         { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
 201         { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
 202         { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
 203         { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
 204         { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
 205         { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
 206         { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */
 207         { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */
 208         { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
 209         { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
 210         { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
 211         { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
 212         { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
 213         { 0, 0 }
 214 };
 215
 216 static int usblp_select_alts(struct usblp *usblp);
 217 static int usblp_set_protocol(struct usblp *usblp, int protocol);
 218 static int usblp_cache_device_id_string(struct usblp *usblp);
 219
 220 /* forward reference to make our lives easier */
 221 extern struct usb_driver usblp_driver;
 222
 223 /*
 224  * Functions for usblp control messages.
 225  */
 226
 227 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
 228 {
 229         int retval;
 230         int index = usblp->ifnum;
 231
 232         /* High byte has the interface index.
 233            Low byte has the alternate setting.
 234          */
 235         if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) {
 236           index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
 237         }
 238
 239         retval = usb_control_msg(usblp->dev,
 240                 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
 241                 request, type | dir | recip, value, index, buf, len, USBLP_WRITE_TIMEOUT);
 242         dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d",
 243                 request, !!dir, recip, value, index, len, retval);
 244         return retval < 0 ? retval : 0;
 245 }
 246
 247 #define usblp_read_status(usblp, status)\
 248         usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
 249 #define usblp_get_id(usblp, config, id, maxlen)\
 250         usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
 251 #define usblp_reset(usblp)\
 252         usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
 253
 254 #define usblp_hp_channel_change_request(usblp, channel, buffer) \
 255         usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
 256
 257 /*
 258  * See the description for usblp_select_alts() below for the usage
 259  * explanation.  Look into your /proc/bus/usb/devices and dmesg in
 260  * case of any trouble.
 261  */
 262 static int proto_bias = -1;
 263
 264 /*
 265  * URB callback.
 266  */
 267
 268 static void usblp_bulk_read(struct urb *urb, struct pt_regs *regs)
 269 {
 270         struct usblp *usblp = urb->context;
 271
 272         if (!usblp || !usblp->dev || !usblp->used || !usblp->present)
 273                 return;
 274
 275         if (unlikely(urb->status))
 276                 warn("usblp%d: nonzero read/write bulk status received: %d",
 277                         usblp->minor, urb->status);
 278         usblp->rcomplete = 1;
 279         wake_up_interruptible(&usblp->wait);
 280 }
 281
 282 static void usblp_bulk_write(struct urb *urb, struct pt_regs *regs)
 283 {
 284         struct usblp *usblp = urb->context;
 285
 286         if (!usblp || !usblp->dev || !usblp->used || !usblp->present)
 287                 return;
 288
 289         if (unlikely(urb->status))
 290                 warn("usblp%d: nonzero read/write bulk status received: %d",
 291                         usblp->minor, urb->status);
 292         usblp->wcomplete = 1;
 293         wake_up_interruptible(&usblp->wait);
 294 }
 295
 296 /*
 297  * Get and print printer errors.
 298  */
 299
 300 static char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
 301
 302 static int usblp_check_status(struct usblp *usblp, int err)
 303 {
 304         unsigned char status, newerr = 0;
 305         int error;
 306
 307         error = usblp_read_status (usblp, usblp->statusbuf);
 308         if (error < 0) {
 309                 err("usblp%d: error %d reading printer status",
 310                         usblp->minor, error);
 311                 return 0;
 312         }
 313
 314         status = *usblp->statusbuf;
 315
 316         if (~status & LP_PERRORP)
 317                 newerr = 3;
 318         if (status & LP_POUTPA)
 319                 newerr = 1;
 320         if (~status & LP_PSELECD)
 321                 newerr = 2;
 322
 323         if (newerr != err)
 324                 info("usblp%d: %s", usblp->minor, usblp_messages[newerr]);
 325
 326         return newerr;
 327 }
 328
 329 /*
 330  * File op functions.
 331  */
 332
 333 static int usblp_open(struct inode *inode, struct file *file)
 334 {
 335         int minor = iminor(inode);
 336         struct usblp *usblp;
 337         struct usb_interface *intf;
 338         int retval;
 339
 340         if (minor < 0)
 341                 return -ENODEV;
 342
 343         lock_kernel();
 344
 345         retval = -ENODEV;
 346         intf = usb_find_interface(&usblp_driver, minor);
 347         if (!intf) {
 348                 goto out;
 349         }
 350         usblp = usb_get_intfdata (intf);
 351         if (!usblp || !usblp->dev || !usblp->present)
 352                 goto out;
 353
 354         retval = -EBUSY;
 355         if (usblp->used)
 356                 goto out;
 357
 358         /*
 359          * TODO: need to implement LP_ABORTOPEN + O_NONBLOCK as in drivers/char/lp.c ???
 360          * This is #if 0-ed because we *don't* want to fail an open
 361          * just because the printer is off-line.
 362          */
 363 #if 0
 364         if ((retval = usblp_check_status(usblp, 0))) {
 365                 retval = retval > 1 ? -EIO : -ENOSPC;
 366                 goto out;
 367         }
 368 #else
 369         retval = 0;
 370 #endif
 371
 372         usblp->used = 1;
 373         file->private_data = usblp;
 374
 375         usblp->writeurb->transfer_buffer_length = 0;
 376         usblp->wcomplete = 1; /* we begin writeable */
 377         usblp->rcomplete = 0;
 378
 379         if (usblp->bidir) {
 380                 usblp->readcount = 0;
 381                 usblp->readurb->dev = usblp->dev;
 382                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) {
 383                         retval = -EIO;
 384                         usblp->used = 0;
 385                         file->private_data = NULL;
 386                 }
 387         }
 388 out:
 389         unlock_kernel();
 390         return retval;
 391 }
 392
 393 static void usblp_cleanup (struct usblp *usblp)
 394 {
 395         info("usblp%d: removed", usblp->minor);
 396
 397         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 398                         usblp->writebuf, usblp->writeurb->transfer_dma);
 399         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 400                         usblp->readbuf, usblp->readurb->transfer_dma);
 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_unlink_urb(usblp->writeurb);
 411         if (usblp->bidir)
 412                 usb_unlink_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                 up(&usblp->sem);
 424         } else          /* finish cleanup from disconnect */
 425                 usblp_cleanup (usblp);
 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                                     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] = usblp->dev->descriptor.idVendor;
 578                                 twoints[1] = 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                         default:
 591                                 retval = -ENOTTY;
 592                 }
 593         else    /* old-style ioctl value */
 594                 switch (cmd) {
 595
 596                         case LPGETSTATUS:
 597                                 if (usblp_read_status(usblp, usblp->statusbuf)) {
 598                                         err("usblp%d: failed reading printer status", usblp->minor);
 599                                         retval = -EIO;
 600                                         goto done;
 601                                 }
 602                                 status = *usblp->statusbuf;
 603                                 if (copy_to_user ((void __user *)arg, &status, sizeof(int)))
 604                                         retval = -EFAULT;
 605                                 break;
 606
 607                         default:
 608                                 retval = -ENOTTY;
 609                 }
 610
 611 done:
 612         up (&usblp->sem);
 613         return retval;
 614 }
 615
 616 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 617 {
 618         DECLARE_WAITQUEUE(wait, current);
 619         struct usblp *usblp = file->private_data;
 620         int timeout, err = 0, transfer_length = 0;
 621         size_t writecount = 0;
 622
 623         while (writecount < count) {
 624                 if (!usblp->wcomplete) {
 625                         barrier();
 626                         if (file->f_flags & O_NONBLOCK) {
 627                                 writecount += transfer_length;
 628                                 return writecount ? writecount : -EAGAIN;
 629                         }
 630
 631                         timeout = USBLP_WRITE_TIMEOUT;
 632                         add_wait_queue(&usblp->wait, &wait);
 633                         while ( 1==1 ) {
 634
 635                                 if (signal_pending(current)) {
 636                                         remove_wait_queue(&usblp->wait, &wait);
 637                                         return writecount ? writecount : -EINTR;
 638                                 }
 639                                 set_current_state(TASK_INTERRUPTIBLE);
 640                                 if (timeout && !usblp->wcomplete) {
 641                                         timeout = schedule_timeout(timeout);
 642                                 } else {
 643                                         set_current_state(TASK_RUNNING);
 644                                         break;
 645                                 }
 646                         }
 647                         remove_wait_queue(&usblp->wait, &wait);
 648                 }
 649
 650                 down (&usblp->sem);
 651                 if (!usblp->present) {
 652                         up (&usblp->sem);
 653                         return -ENODEV;
 654                 }
 655
 656                 if (usblp->writeurb->status != 0) {
 657                         if (usblp->quirks & USBLP_QUIRK_BIDIR) {
 658                                 if (!usblp->wcomplete)
 659                                         err("usblp%d: error %d writing to printer",
 660                                                 usblp->minor, usblp->writeurb->status);
 661                                 err = usblp->writeurb->status;
 662                         } else
 663                                 err = usblp_check_status(usblp, err);
 664                         up (&usblp->sem);
 665
 666                         /* if the fault was due to disconnect, let khubd's
 667                          * call to usblp_disconnect() grab usblp->sem ...
 668                          */
 669                         schedule ();
 670                         continue;
 671                 }
 672
 673                 /* We must increment writecount here, and not at the
 674                  * end of the loop. Otherwise, the final loop iteration may
 675                  * be skipped, leading to incomplete printer output.
 676                  */
 677                 writecount += transfer_length;
 678                 if (writecount == count) {
 679                         up(&usblp->sem);
 680                         break;
 681                 }
 682
 683                 transfer_length=(count - writecount);
 684                 if (transfer_length > USBLP_BUF_SIZE)
 685                         transfer_length = USBLP_BUF_SIZE;
 686
 687                 usblp->writeurb->transfer_buffer_length = transfer_length;
 688
 689                 if (copy_from_user(usblp->writeurb->transfer_buffer,
 690                                    buffer + writecount, transfer_length)) {
 691                         up(&usblp->sem);
 692                         return writecount ? writecount : -EFAULT;
 693                 }
 694
 695                 usblp->writeurb->dev = usblp->dev;
 696                 usblp->wcomplete = 0;
 697                 err = usb_submit_urb(usblp->writeurb, GFP_KERNEL);
 698                 if (err) {
 699                         if (err != -ENOMEM)
 700                                 count = -EIO;
 701                         else
 702                                 count = writecount ? writecount : -ENOMEM;
 703                         up (&usblp->sem);
 704                         break;
 705                 }
 706                 up (&usblp->sem);
 707         }
 708
 709         return count;
 710 }
 711
 712 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 713 {
 714         struct usblp *usblp = file->private_data;
 715         DECLARE_WAITQUEUE(wait, current);
 716
 717         if (!usblp->bidir)
 718                 return -EINVAL;
 719
 720         down (&usblp->sem);
 721         if (!usblp->present) {
 722                 count = -ENODEV;
 723                 goto done;
 724         }
 725
 726         if (!usblp->rcomplete) {
 727                 barrier();
 728
 729                 if (file->f_flags & O_NONBLOCK) {
 730                         count = -EAGAIN;
 731                         goto done;
 732                 }
 733
 734                 add_wait_queue(&usblp->wait, &wait);
 735                 while (1==1) {
 736                         if (signal_pending(current)) {
 737                                 count = -EINTR;
 738                                 remove_wait_queue(&usblp->wait, &wait);
 739                                 goto done;
 740                         }
 741                         up (&usblp->sem);
 742                         set_current_state(TASK_INTERRUPTIBLE);
 743                         if (!usblp->rcomplete) {
 744                                 schedule();
 745                         } else {
 746                                 set_current_state(TASK_RUNNING);
 747                                 break;
 748                         }
 749                         down (&usblp->sem);
 750                 }
 751                 remove_wait_queue(&usblp->wait, &wait);
 752         }
 753
 754         if (!usblp->present) {
 755                 count = -ENODEV;
 756                 goto done;
 757         }
 758
 759         if (usblp->readurb->status) {
 760                 err("usblp%d: error %d reading from printer",
 761                         usblp->minor, usblp->readurb->status);
 762                 usblp->readurb->dev = usblp->dev;
 763                 usblp->readcount = 0;
 764                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0)
 765                         dbg("error submitting urb");
 766                 count = -EIO;
 767                 goto done;
 768         }
 769
 770         count = count < usblp->readurb->actual_length - usblp->readcount ?
 771                 count : usblp->readurb->actual_length - usblp->readcount;
 772
 773         if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) {
 774                 count = -EFAULT;
 775                 goto done;
 776         }
 777
 778         if ((usblp->readcount += count) == usblp->readurb->actual_length) {
 779                 usblp->readcount = 0;
 780                 usblp->readurb->dev = usblp->dev;
 781                 usblp->rcomplete = 0;
 782                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL)) {
 783                         count = -EIO;
 784                         goto done;
 785                 }
 786         }
 787
 788 done:
 789         up (&usblp->sem);
 790         return count;
 791 }
 792
 793 /*
 794  * Checks for printers that have quirks, such as requiring unidirectional
 795  * communication but reporting bidirectional; currently some HP printers
 796  * have this flaw (HP 810, 880, 895, etc.), or needing an init string
 797  * sent at each open (like some Epsons).
 798  * Returns 1 if found, 0 if not found.
 799  *
 800  * HP recommended that we use the bidirectional interface but
 801  * don't attempt any bulk IN transfers from the IN endpoint.
 802  * Here's some more detail on the problem:
 803  * The problem is not that it isn't bidirectional though. The problem
 804  * is that if you request a device ID, or status information, while
 805  * the buffers are full, the return data will end up in the print data
 806  * buffer. For example if you make sure you never request the device ID
 807  * while you are sending print data, and you don't try to query the
 808  * printer status every couple of milliseconds, you will probably be OK.
 809  */
 810 static unsigned int usblp_quirks (__u16 vendor, __u16 product)
 811 {
 812         int i;
 813
 814         for (i = 0; quirk_printers[i].vendorId; i++) {
 815                 if (vendor == quirk_printers[i].vendorId &&
 816                     product == quirk_printers[i].productId)
 817                         return quirk_printers[i].quirks;
 818         }
 819         return 0;
 820 }
 821
 822 static struct file_operations usblp_fops = {
 823         .owner =        THIS_MODULE,
 824         .read =         usblp_read,
 825         .write =        usblp_write,
 826         .poll =         usblp_poll,
 827         .ioctl =        usblp_ioctl,
 828         .open =         usblp_open,
 829         .release =      usblp_release,
 830 };
 831
 832 static struct usb_class_driver usblp_class = {
 833         .name =         "usb/lp%d",
 834         .fops =         &usblp_fops,
 835         .mode =         S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,
 836         .minor_base =   USBLP_MINOR_BASE,
 837 };
 838
 839 static int usblp_probe(struct usb_interface *intf,
 840                        const struct usb_device_id *id)
 841 {
 842         struct usb_device *dev = interface_to_usbdev (intf);
 843         struct usblp *usblp = 0;
 844         int protocol;
 845         int retval;
 846
 847         /* Malloc and start initializing usblp structure so we can use it
 848          * directly. */
 849         if (!(usblp = kmalloc(sizeof(struct usblp), GFP_KERNEL))) {
 850                 err("out of memory for usblp");
 851                 goto abort;
 852         }
 853         memset(usblp, 0, sizeof(struct usblp));
 854         usblp->dev = dev;
 855         init_MUTEX (&usblp->sem);
 856         init_waitqueue_head(&usblp->wait);
 857         usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
 858         usblp->intf = intf;
 859
 860         usblp->writeurb = usb_alloc_urb(0, GFP_KERNEL);
 861         if (!usblp->writeurb) {
 862                 err("out of memory");
 863                 goto abort;
 864         }
 865         usblp->readurb = usb_alloc_urb(0, GFP_KERNEL);
 866         if (!usblp->readurb) {
 867                 err("out of memory");
 868                 goto abort;
 869         }
 870
 871         /* Malloc device ID string buffer to the largest expected length,
 872          * since we can re-query it on an ioctl and a dynamic string
 873          * could change in length. */
 874         if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
 875                 err("out of memory for device_id_string");
 876                 goto abort;
 877         }
 878
 879         usblp->writebuf = usblp->readbuf = NULL;
 880         usblp->writeurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 881         usblp->readurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 882         /* Malloc write & read buffers.  We somewhat wastefully
 883          * malloc both regardless of bidirectionality, because the
 884          * alternate setting can be changed later via an ioctl. */
 885         if (!(usblp->writebuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
 886                                 GFP_KERNEL, &usblp->writeurb->transfer_dma))) {
 887                 err("out of memory for write buf");
 888                 goto abort;
 889         }
 890         if (!(usblp->readbuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
 891                                 GFP_KERNEL, &usblp->readurb->transfer_dma))) {
 892                 err("out of memory for read buf");
 893                 goto abort;
 894         }
 895
 896         /* Allocate buffer for printer status */
 897         usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
 898         if (!usblp->statusbuf) {
 899                 err("out of memory for statusbuf");
 900                 goto abort;
 901         }
 902
 903         /* Lookup quirks for this printer. */
 904         usblp->quirks = usblp_quirks(
 905                 dev->descriptor.idVendor,
 906                 dev->descriptor.idProduct);
 907
 908         /* Analyze and pick initial alternate settings and endpoints. */
 909         protocol = usblp_select_alts(usblp);
 910         if (protocol < 0) {
 911                 dbg("incompatible printer-class device 0x%4.4X/0x%4.4X",
 912                         dev->descriptor.idVendor,
 913                         dev->descriptor.idProduct);
 914                 goto abort;
 915         }
 916
 917         /* Setup the selected alternate setting and endpoints. */
 918         if (usblp_set_protocol(usblp, protocol) < 0)
 919                 goto abort;
 920
 921         /* Retrieve and store the device ID string. */
 922         usblp_cache_device_id_string(usblp);
 923
 924 #ifdef DEBUG
 925         usblp_check_status(usblp, 0);
 926 #endif
 927
 928         info("usblp%d: USB %sdirectional printer dev %d "
 929                 "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X",
 930                 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
 931                 usblp->ifnum,
 932                 usblp->protocol[usblp->current_protocol].alt_setting,
 933                 usblp->current_protocol, usblp->dev->descriptor.idVendor,
 934                 usblp->dev->descriptor.idProduct);
 935
 936         usb_set_intfdata (intf, usblp);
 937
 938         usblp->present = 1;
 939
 940         retval = usb_register_dev(intf, &usblp_class);
 941         if (retval) {
 942                 err("Not able to get a minor for this device.");
 943                 goto abort_intfdata;
 944         }
 945         usblp->minor = intf->minor;
 946
 947         return 0;
 948
 949 abort_intfdata:
 950         usb_set_intfdata (intf, NULL);
 951 abort:
 952         if (usblp) {
 953                 if (usblp->writebuf)
 954                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 955                                 usblp->writebuf, usblp->writeurb->transfer_dma);
 956                 if (usblp->readbuf)
 957                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 958                                 usblp->readbuf, usblp->writeurb->transfer_dma);
 959                 kfree(usblp->statusbuf);
 960                 kfree(usblp->device_id_string);
 961                 usb_free_urb(usblp->writeurb);
 962                 usb_free_urb(usblp->readurb);
 963                 kfree(usblp);
 964         }
 965         return -EIO;
 966 }
 967
 968 /*
 969  * We are a "new" style driver with usb_device_id table,
 970  * but our requirements are too intricate for simple match to handle.
 971  *
 972  * The "proto_bias" option may be used to specify the preferred protocol
 973  * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3).  If the device
 974  * supports the preferred protocol, then we bind to it.
 975  *
 976  * The best interface for us is 7/1/2, because it is compatible
 977  * with a stream of characters. If we find it, we bind to it.
 978  *
 979  * Note that the people from hpoj.sourceforge.net need to be able to
 980  * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
 981  *
 982  * Failing 7/1/2, we look for 7/1/3, even though it's probably not
 983  * stream-compatible, because this matches the behaviour of the old code.
 984  *
 985  * If nothing else, we bind to 7/1/1 - the unidirectional interface.
 986  */
 987 static int usblp_select_alts(struct usblp *usblp)
 988 {
 989         struct usb_interface *if_alt;
 990         struct usb_host_interface *ifd;
 991         struct usb_endpoint_descriptor *epd, *epwrite, *epread;
 992         int p, i, e;
 993
 994         if_alt = usblp->intf;
 995
 996         for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
 997                 usblp->protocol[p].alt_setting = -1;
 998
 999         /* Find out what we have. */
1000         for (i = 0; i < if_alt->num_altsetting; i++) {
1001                 ifd = &if_alt->altsetting[i];
1002
1003                 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
1004                         continue;
1005
1006                 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1007                     ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1008                         continue;
1009
1010                 /* Look for bulk OUT and IN endpoints. */
1011                 epwrite = epread = 0;
1012                 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1013                         epd = &ifd->endpoint[e].desc;
1014
1015                         if ((epd->bmAttributes&USB_ENDPOINT_XFERTYPE_MASK)!=
1016                             USB_ENDPOINT_XFER_BULK)
1017                                 continue;
1018
1019                         if (!(epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK)) {
1020                                 if (!epwrite)
1021                                         epwrite = epd;
1022
1023                         } else {
1024                                 if (!epread)
1025                                         epread = epd;
1026                         }
1027                 }
1028
1029                 /* Ignore buggy hardware without the right endpoints. */
1030                 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1031                         continue;
1032
1033                 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1034                  * and buggy bidirectional printers. */
1035                 if (ifd->desc.bInterfaceProtocol == 1) {
1036                         epread = NULL;
1037                 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1038                         info("Disabling reads from problem bidirectional "
1039                                 "printer on usblp%d", usblp->minor);
1040                         epread = NULL;
1041                 }
1042
1043                 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1044                                 ifd->desc.bAlternateSetting;
1045                 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1046                 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1047         }
1048
1049         /* If our requested protocol is supported, then use it. */
1050         if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1051             proto_bias <= USBLP_LAST_PROTOCOL &&
1052             usblp->protocol[proto_bias].alt_setting != -1)
1053                 return proto_bias;
1054
1055         /* Ordering is important here. */
1056         if (usblp->protocol[2].alt_setting != -1)
1057                 return 2;
1058         if (usblp->protocol[1].alt_setting != -1)
1059                 return 1;
1060         if (usblp->protocol[3].alt_setting != -1)
1061                 return 3;
1062
1063         /* If nothing is available, then don't bind to this device. */
1064         return -1;
1065 }
1066
1067 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1068 {
1069         int r, alts;
1070
1071         if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1072                 return -EINVAL;
1073
1074         alts = usblp->protocol[protocol].alt_setting;
1075         if (alts < 0)
1076                 return -EINVAL;
1077         r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1078         if (r < 0) {
1079                 err("can't set desired altsetting %d on interface %d",
1080                         alts, usblp->ifnum);
1081                 return r;
1082         }
1083
1084         usb_fill_bulk_urb(usblp->writeurb, usblp->dev,
1085                 usb_sndbulkpipe(usblp->dev,
1086                   usblp->protocol[protocol].epwrite->bEndpointAddress),
1087                 usblp->writebuf, 0,
1088                 usblp_bulk_write, usblp);
1089
1090         usblp->bidir = (usblp->protocol[protocol].epread != 0);
1091         if (usblp->bidir)
1092                 usb_fill_bulk_urb(usblp->readurb, usblp->dev,
1093                         usb_rcvbulkpipe(usblp->dev,
1094                           usblp->protocol[protocol].epread->bEndpointAddress),
1095                         usblp->readbuf, USBLP_BUF_SIZE,
1096                         usblp_bulk_read, usblp);
1097
1098         usblp->current_protocol = protocol;
1099         dbg("usblp%d set protocol %d", usblp->minor, protocol);
1100         return 0;
1101 }
1102
1103 /* Retrieves and caches device ID string.
1104  * Returns length, including length bytes but not null terminator.
1105  * On error, returns a negative errno value. */
1106 static int usblp_cache_device_id_string(struct usblp *usblp)
1107 {
1108         int err, length;
1109
1110         err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1111         if (err < 0) {
1112                 dbg("usblp%d: error = %d reading IEEE-1284 Device ID string",
1113                         usblp->minor, err);
1114                 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1115                 return -EIO;
1116         }
1117
1118         /* First two bytes are length in big-endian.
1119          * They count themselves, and we copy them into
1120          * the user's buffer. */
1121         length = be16_to_cpu(*((u16 *)usblp->device_id_string));
1122         if (length < 2)
1123                 length = 2;
1124         else if (length >= USBLP_DEVICE_ID_SIZE)
1125                 length = USBLP_DEVICE_ID_SIZE - 1;
1126         usblp->device_id_string[length] = '\0';
1127
1128         dbg("usblp%d Device ID string [len=%d]=\"%s\"",
1129                 usblp->minor, length, &usblp->device_id_string[2]);
1130
1131         return length;
1132 }
1133
1134 static void usblp_disconnect(struct usb_interface *intf)
1135 {
1136         struct usblp *usblp = usb_get_intfdata (intf);
1137
1138         usb_deregister_dev(intf, &usblp_class);
1139
1140         if (!usblp || !usblp->dev) {
1141                 err("bogus disconnect");
1142                 BUG ();
1143         }
1144
1145         down (&usblp->sem);
1146         lock_kernel();
1147         usblp->present = 0;
1148         usb_set_intfdata (intf, NULL);
1149
1150         usblp_unlink_urbs(usblp);
1151
1152         if (!usblp->used)
1153                 usblp_cleanup (usblp);
1154         else    /* cleanup later, on release */
1155                 up (&usblp->sem);
1156         unlock_kernel();
1157 }
1158
1159 static struct usb_device_id usblp_ids [] = {
1160         { USB_DEVICE_INFO(7, 1, 1) },
1161         { USB_DEVICE_INFO(7, 1, 2) },
1162         { USB_DEVICE_INFO(7, 1, 3) },
1163         { USB_INTERFACE_INFO(7, 1, 1) },
1164         { USB_INTERFACE_INFO(7, 1, 2) },
1165         { USB_INTERFACE_INFO(7, 1, 3) },
1166         { }                                             /* Terminating entry */
1167 };
1168
1169 MODULE_DEVICE_TABLE (usb, usblp_ids);
1170
1171 static struct usb_driver usblp_driver = {
1172         .owner =        THIS_MODULE,
1173         .name =         "usblp",
1174         .probe =        usblp_probe,
1175         .disconnect =   usblp_disconnect,
1176         .id_table =     usblp_ids,
1177 };
1178
1179 static int __init usblp_init(void)
1180 {
1181         int retval;
1182         retval = usb_register(&usblp_driver);
1183         if (retval)
1184                 goto out;
1185         info(DRIVER_VERSION ": " DRIVER_DESC);
1186 out:
1187         return retval;
1188 }
1189
1190 static void __exit usblp_exit(void)
1191 {
1192         usb_deregister(&usblp_driver);
1193 }
1194
1195 module_init(usblp_init);
1196 module_exit(usblp_exit);
1197
1198 MODULE_AUTHOR( DRIVER_AUTHOR );
1199 MODULE_DESCRIPTION( DRIVER_DESC );
1200 MODULE_PARM(proto_bias, "i");
1201 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1202 MODULE_LICENSE("GPL");