git.oblomov.eu Git - linux-2.6/blob - drivers/usb/class/usblp.c

   1 /*
   2  * usblp.c  Version 0.13
   3  *
   4  * Copyright (c) 1999 Michael Gee       <michael@linuxspecific.com>
   5  * Copyright (c) 1999 Pavel Machek      <pavel@suse.cz>
   6  * Copyright (c) 2000 Randy Dunlap      <rdunlap@xenotime.net>
   7  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
   8  # Copyright (c) 2001 Pete Zaitcev      <zaitcev@redhat.com>
   9  # Copyright (c) 2001 David Paschal     <paschal@rcsis.com>
  10  * Copyright (c) 2006 Oliver Neukum     <oliver@neukum.name>
  11  *
  12  * USB Printer Device Class driver for USB printers and printer cables
  13  *
  14  * Sponsored by SuSE
  15  *
  16  * ChangeLog:
  17  *      v0.1 - thorough cleaning, URBification, almost a rewrite
  18  *      v0.2 - some more cleanups
  19  *      v0.3 - cleaner again, waitqueue fixes
  20  *      v0.4 - fixes in unidirectional mode
  21  *      v0.5 - add DEVICE_ID string support
  22  *      v0.6 - never time out
  23  *      v0.7 - fixed bulk-IN read and poll (David Paschal)
  24  *      v0.8 - add devfs support
  25  *      v0.9 - fix unplug-while-open paths
  26  *      v0.10- remove sleep_on, fix error on oom (oliver@neukum.org)
  27  *      v0.11 - add proto_bias option (Pete Zaitcev)
  28  *      v0.12 - add hpoj.sourceforge.net ioctls (David Paschal)
  29  *      v0.13 - alloc space for statusbuf (<status> not on stack);
  30  *              use usb_buffer_alloc() for read buf & write buf;
  31  */
  32
  33 /*
  34  * This program is free software; you can redistribute it and/or modify
  35  * it under the terms of the GNU General Public License as published by
  36  * the Free Software Foundation; either version 2 of the License, or
  37  * (at your option) any later version.
  38  *
  39  * This program is distributed in the hope that it will be useful,
  40  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  41  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  42  * GNU General Public License for more details.
  43  *
  44  * You should have received a copy of the GNU General Public License
  45  * along with this program; if not, write to the Free Software
  46  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  47  */
  48
  49 #include <linux/module.h>
  50 #include <linux/kernel.h>
  51 #include <linux/sched.h>
  52 #include <linux/smp_lock.h>
  53 #include <linux/signal.h>
  54 #include <linux/poll.h>
  55 #include <linux/init.h>
  56 #include <linux/slab.h>
  57 #include <linux/lp.h>
  58 #undef DEBUG
  59 #include <linux/usb.h>
  60
  61 /*
  62  * Version Information
  63  */
  64 #define DRIVER_VERSION "v0.13"
  65 #define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal"
  66 #define DRIVER_DESC "USB Printer Device Class driver"
  67
  68 #define USBLP_BUF_SIZE          8192
  69 #define USBLP_DEVICE_ID_SIZE    1024
  70
  71 /* ioctls: */
  72 #define LPGETSTATUS             0x060b          /* same as in drivers/char/lp.c */
  73 #define IOCNR_GET_DEVICE_ID             1
  74 #define IOCNR_GET_PROTOCOLS             2
  75 #define IOCNR_SET_PROTOCOL              3
  76 #define IOCNR_HP_SET_CHANNEL            4
  77 #define IOCNR_GET_BUS_ADDRESS           5
  78 #define IOCNR_GET_VID_PID               6
  79 #define IOCNR_SOFT_RESET                7
  80 /* Get device_id string: */
  81 #define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len)
  82 /* The following ioctls were added for http://hpoj.sourceforge.net: */
  83 /* Get two-int array:
  84  * [0]=current protocol (1=7/1/1, 2=7/1/2, 3=7/1/3),
  85  * [1]=supported protocol mask (mask&(1<<n)!=0 means 7/1/n supported): */
  86 #define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
  87 /* Set protocol (arg: 1=7/1/1, 2=7/1/2, 3=7/1/3): */
  88 #define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0)
  89 /* Set channel number (HP Vendor-specific command): */
  90 #define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0)
  91 /* Get two-int array: [0]=bus number, [1]=device address: */
  92 #define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len)
  93 /* Get two-int array: [0]=vendor ID, [1]=product ID: */
  94 #define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len)
  95 /* Perform class specific soft reset */
  96 #define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0);
  97
  98 /*
  99  * A DEVICE_ID string may include the printer's serial number.
 100  * It should end with a semi-colon (';').
 101  * An example from an HP 970C DeskJet printer is (this is one long string,
 102  * with the serial number changed):
 103 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:                    ;
 104  */
 105
 106 /*
 107  * USB Printer Requests
 108  */
 109
 110 #define USBLP_REQ_GET_ID                        0x00
 111 #define USBLP_REQ_GET_STATUS                    0x01
 112 #define USBLP_REQ_RESET                         0x02
 113 #define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST     0x00    /* HP Vendor-specific */
 114
 115 #define USBLP_MINORS            16
 116 #define USBLP_MINOR_BASE        0
 117
 118 #define USBLP_WRITE_TIMEOUT     (5000)                  /* 5 seconds */
 119
 120 #define USBLP_FIRST_PROTOCOL    1
 121 #define USBLP_LAST_PROTOCOL     3
 122 #define USBLP_MAX_PROTOCOLS     (USBLP_LAST_PROTOCOL+1)
 123
 124 /*
 125  * some arbitrary status buffer size;
 126  * need a status buffer that is allocated via kmalloc(), not on stack
 127  */
 128 #define STATUS_BUF_SIZE         8
 129
 130 struct usblp {
 131         struct usb_device       *dev;                   /* USB device */
 132         struct semaphore        sem;                    /* locks this struct, especially "dev" */
 133         char                    *writebuf;              /* write transfer_buffer */
 134         char                    *readbuf;               /* read transfer_buffer */
 135         char                    *statusbuf;             /* status transfer_buffer */
 136         struct urb              *readurb, *writeurb;    /* The urbs */
 137         wait_queue_head_t       wait;                   /* Zzzzz ... */
 138         int                     readcount;              /* Counter for reads */
 139         int                     ifnum;                  /* Interface number */
 140         struct usb_interface    *intf;                  /* The interface */
 141         /* Alternate-setting numbers and endpoints for each protocol
 142          * (7/1/{index=1,2,3}) that the device supports: */
 143         struct {
 144                 int                             alt_setting;
 145                 struct usb_endpoint_descriptor  *epwrite;
 146                 struct usb_endpoint_descriptor  *epread;
 147         }                       protocol[USBLP_MAX_PROTOCOLS];
 148         int                     current_protocol;
 149         int                     minor;                  /* minor number of device */
 150         int                     wcomplete;              /* writing is completed */
 151         int                     rcomplete;              /* reading is completed */
 152         unsigned int            quirks;                 /* quirks flags */
 153         unsigned char           used;                   /* True if open */
 154         unsigned char           present;                /* True if not disconnected */
 155         unsigned char           bidir;                  /* interface is bidirectional */
 156         unsigned char           *device_id_string;      /* IEEE 1284 DEVICE ID string (ptr) */
 157                                                         /* first 2 bytes are (big-endian) length */
 158 };
 159
 160 #ifdef DEBUG
 161 static void usblp_dump(struct usblp *usblp) {
 162         int p;
 163
 164         dbg("usblp=0x%p", usblp);
 165         dbg("dev=0x%p", usblp->dev);
 166         dbg("present=%d", usblp->present);
 167         dbg("readbuf=0x%p", usblp->readbuf);
 168         dbg("writebuf=0x%p", usblp->writebuf);
 169         dbg("readurb=0x%p", usblp->readurb);
 170         dbg("writeurb=0x%p", usblp->writeurb);
 171         dbg("readcount=%d", usblp->readcount);
 172         dbg("ifnum=%d", usblp->ifnum);
 173     for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
 174         dbg("protocol[%d].alt_setting=%d", p, usblp->protocol[p].alt_setting);
 175         dbg("protocol[%d].epwrite=%p", p, usblp->protocol[p].epwrite);
 176         dbg("protocol[%d].epread=%p", p, usblp->protocol[p].epread);
 177     }
 178         dbg("current_protocol=%d", usblp->current_protocol);
 179         dbg("minor=%d", usblp->minor);
 180         dbg("wcomplete=%d", usblp->wcomplete);
 181         dbg("rcomplete=%d", usblp->rcomplete);
 182         dbg("quirks=%d", usblp->quirks);
 183         dbg("used=%d", usblp->used);
 184         dbg("bidir=%d", usblp->bidir);
 185         dbg("device_id_string=\"%s\"",
 186                 usblp->device_id_string ?
 187                         usblp->device_id_string + 2 :
 188                         (unsigned char *)"(null)");
 189 }
 190 #endif
 191
 192 /* Quirks: various printer quirks are handled by this table & its flags. */
 193
 194 struct quirk_printer_struct {
 195         __u16 vendorId;
 196         __u16 productId;
 197         unsigned int quirks;
 198 };
 199
 200 #define USBLP_QUIRK_BIDIR       0x1     /* reports bidir but requires unidirectional mode (no INs/reads) */
 201 #define USBLP_QUIRK_USB_INIT    0x2     /* needs vendor USB init string */
 202
 203 static const struct quirk_printer_struct quirk_printers[] = {
 204         { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
 205         { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
 206         { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
 207         { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
 208         { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
 209         { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
 210         { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */
 211         { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */
 212         { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
 213         { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
 214         { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
 215         { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
 216         { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
 217         { 0, 0 }
 218 };
 219
 220 static int usblp_select_alts(struct usblp *usblp);
 221 static int usblp_set_protocol(struct usblp *usblp, int protocol);
 222 static int usblp_cache_device_id_string(struct usblp *usblp);
 223
 224 /* forward reference to make our lives easier */
 225 static struct usb_driver usblp_driver;
 226 static DECLARE_MUTEX(usblp_sem);        /* locks the existence of usblp's */
 227
 228 /*
 229  * Functions for usblp control messages.
 230  */
 231
 232 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
 233 {
 234         int retval;
 235         int index = usblp->ifnum;
 236
 237         /* High byte has the interface index.
 238            Low byte has the alternate setting.
 239          */
 240         if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) {
 241           index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
 242         }
 243
 244         retval = usb_control_msg(usblp->dev,
 245                 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
 246                 request, type | dir | recip, value, index, buf, len, USBLP_WRITE_TIMEOUT);
 247         dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d",
 248                 request, !!dir, recip, value, index, len, retval);
 249         return retval < 0 ? retval : 0;
 250 }
 251
 252 #define usblp_read_status(usblp, status)\
 253         usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
 254 #define usblp_get_id(usblp, config, id, maxlen)\
 255         usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
 256 #define usblp_reset(usblp)\
 257         usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
 258
 259 #define usblp_hp_channel_change_request(usblp, channel, buffer) \
 260         usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
 261
 262 /*
 263  * See the description for usblp_select_alts() below for the usage
 264  * explanation.  Look into your /proc/bus/usb/devices and dmesg in
 265  * case of any trouble.
 266  */
 267 static int proto_bias = -1;
 268
 269 /*
 270  * URB callback.
 271  */
 272
 273 static void usblp_bulk_read(struct urb *urb, struct pt_regs *regs)
 274 {
 275         struct usblp *usblp = urb->context;
 276
 277         if (unlikely(!usblp || !usblp->dev || !usblp->used))
 278                 return;
 279
 280         if (unlikely(!usblp->present))
 281                 goto unplug;
 282         if (unlikely(urb->status))
 283                 warn("usblp%d: nonzero read/write bulk status received: %d",
 284                         usblp->minor, urb->status);
 285         usblp->rcomplete = 1;
 286 unplug:
 287         wake_up_interruptible(&usblp->wait);
 288 }
 289
 290 static void usblp_bulk_write(struct urb *urb, struct pt_regs *regs)
 291 {
 292         struct usblp *usblp = urb->context;
 293
 294         if (unlikely(!usblp || !usblp->dev || !usblp->used))
 295                 return;
 296         if (unlikely(!usblp->present))
 297                 goto unplug;
 298         if (unlikely(urb->status))
 299                 warn("usblp%d: nonzero read/write bulk status received: %d",
 300                         usblp->minor, urb->status);
 301         usblp->wcomplete = 1;
 302 unplug:
 303         wake_up_interruptible(&usblp->wait);
 304 }
 305
 306 /*
 307  * Get and print printer errors.
 308  */
 309
 310 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
 311
 312 static int usblp_check_status(struct usblp *usblp, int err)
 313 {
 314         unsigned char status, newerr = 0;
 315         int error;
 316
 317         error = usblp_read_status (usblp, usblp->statusbuf);
 318         if (error < 0) {
 319                 if (printk_ratelimit())
 320                         err("usblp%d: error %d reading printer status",
 321                                 usblp->minor, error);
 322                 return 0;
 323         }
 324
 325         status = *usblp->statusbuf;
 326
 327         if (~status & LP_PERRORP)
 328                 newerr = 3;
 329         if (status & LP_POUTPA)
 330                 newerr = 1;
 331         if (~status & LP_PSELECD)
 332                 newerr = 2;
 333
 334         if (newerr != err)
 335                 info("usblp%d: %s", usblp->minor, usblp_messages[newerr]);
 336
 337         return newerr;
 338 }
 339
 340 /*
 341  * File op functions.
 342  */
 343
 344 static int usblp_open(struct inode *inode, struct file *file)
 345 {
 346         int minor = iminor(inode);
 347         struct usblp *usblp;
 348         struct usb_interface *intf;
 349         int retval;
 350
 351         if (minor < 0)
 352                 return -ENODEV;
 353
 354         down (&usblp_sem);
 355
 356         retval = -ENODEV;
 357         intf = usb_find_interface(&usblp_driver, minor);
 358         if (!intf) {
 359                 goto out;
 360         }
 361         usblp = usb_get_intfdata (intf);
 362         if (!usblp || !usblp->dev || !usblp->present)
 363                 goto out;
 364
 365         retval = -EBUSY;
 366         if (usblp->used)
 367                 goto out;
 368
 369         /*
 370          * TODO: need to implement LP_ABORTOPEN + O_NONBLOCK as in drivers/char/lp.c ???
 371          * This is #if 0-ed because we *don't* want to fail an open
 372          * just because the printer is off-line.
 373          */
 374 #if 0
 375         if ((retval = usblp_check_status(usblp, 0))) {
 376                 retval = retval > 1 ? -EIO : -ENOSPC;
 377                 goto out;
 378         }
 379 #else
 380         retval = 0;
 381 #endif
 382
 383         usblp->used = 1;
 384         file->private_data = usblp;
 385
 386         usblp->writeurb->transfer_buffer_length = 0;
 387         usblp->wcomplete = 1; /* we begin writeable */
 388         usblp->rcomplete = 0;
 389         usblp->writeurb->status = 0;
 390         usblp->readurb->status = 0;
 391
 392         if (usblp->bidir) {
 393                 usblp->readcount = 0;
 394                 usblp->readurb->dev = usblp->dev;
 395                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) {
 396                         retval = -EIO;
 397                         usblp->used = 0;
 398                         file->private_data = NULL;
 399                 }
 400         }
 401 out:
 402         up (&usblp_sem);
 403         return retval;
 404 }
 405
 406 static void usblp_cleanup (struct usblp *usblp)
 407 {
 408         info("usblp%d: removed", usblp->minor);
 409
 410         kfree (usblp->device_id_string);
 411         kfree (usblp->statusbuf);
 412         usb_free_urb(usblp->writeurb);
 413         usb_free_urb(usblp->readurb);
 414         kfree (usblp);
 415 }
 416
 417 static void usblp_unlink_urbs(struct usblp *usblp)
 418 {
 419         usb_kill_urb(usblp->writeurb);
 420         if (usblp->bidir)
 421                 usb_kill_urb(usblp->readurb);
 422 }
 423
 424 static int usblp_release(struct inode *inode, struct file *file)
 425 {
 426         struct usblp *usblp = file->private_data;
 427
 428         down (&usblp_sem);
 429         usblp->used = 0;
 430         if (usblp->present) {
 431                 usblp_unlink_urbs(usblp);
 432         } else          /* finish cleanup from disconnect */
 433                 usblp_cleanup (usblp);
 434         up (&usblp_sem);
 435         return 0;
 436 }
 437
 438 /* No kernel lock - fine */
 439 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
 440 {
 441         struct usblp *usblp = file->private_data;
 442         poll_wait(file, &usblp->wait, wait);
 443         return ((!usblp->bidir || !usblp->rcomplete) ? 0 : POLLIN  | POLLRDNORM)
 444                                | (!usblp->wcomplete ? 0 : POLLOUT | POLLWRNORM);
 445 }
 446
 447 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 448 {
 449         struct usblp *usblp = file->private_data;
 450         int length, err, i;
 451         unsigned char newChannel;
 452         int status;
 453         int twoints[2];
 454         int retval = 0;
 455
 456         down (&usblp->sem);
 457         if (!usblp->present) {
 458                 retval = -ENODEV;
 459                 goto done;
 460         }
 461
 462         dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd),
 463                 _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd) );
 464
 465         if (_IOC_TYPE(cmd) == 'P')      /* new-style ioctl number */
 466
 467                 switch (_IOC_NR(cmd)) {
 468
 469                         case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
 470                                 if (_IOC_DIR(cmd) != _IOC_READ) {
 471                                         retval = -EINVAL;
 472                                         goto done;
 473                                 }
 474
 475                                 length = usblp_cache_device_id_string(usblp);
 476                                 if (length < 0) {
 477                                         retval = length;
 478                                         goto done;
 479                                 }
 480                                 if (length > _IOC_SIZE(cmd))
 481                                         length = _IOC_SIZE(cmd); /* truncate */
 482
 483                                 if (copy_to_user((void __user *) arg,
 484                                                 usblp->device_id_string,
 485                                                 (unsigned long) length)) {
 486                                         retval = -EFAULT;
 487                                         goto done;
 488                                 }
 489
 490                                 break;
 491
 492                         case IOCNR_GET_PROTOCOLS:
 493                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 494                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 495                                         retval = -EINVAL;
 496                                         goto done;
 497                                 }
 498
 499                                 twoints[0] = usblp->current_protocol;
 500                                 twoints[1] = 0;
 501                                 for (i = USBLP_FIRST_PROTOCOL;
 502                                      i <= USBLP_LAST_PROTOCOL; i++) {
 503                                         if (usblp->protocol[i].alt_setting >= 0)
 504                                                 twoints[1] |= (1<<i);
 505                                 }
 506
 507                                 if (copy_to_user((void __user *)arg,
 508                                                 (unsigned char *)twoints,
 509                                                 sizeof(twoints))) {
 510                                         retval = -EFAULT;
 511                                         goto done;
 512                                 }
 513
 514                                 break;
 515
 516                         case IOCNR_SET_PROTOCOL:
 517                                 if (_IOC_DIR(cmd) != _IOC_WRITE) {
 518                                         retval = -EINVAL;
 519                                         goto done;
 520                                 }
 521
 522 #ifdef DEBUG
 523                                 if (arg == -10) {
 524                                         usblp_dump(usblp);
 525                                         break;
 526                                 }
 527 #endif
 528
 529                                 usblp_unlink_urbs(usblp);
 530                                 retval = usblp_set_protocol(usblp, arg);
 531                                 if (retval < 0) {
 532                                         usblp_set_protocol(usblp,
 533                                                 usblp->current_protocol);
 534                                 }
 535                                 break;
 536
 537                         case IOCNR_HP_SET_CHANNEL:
 538                                 if (_IOC_DIR(cmd) != _IOC_WRITE ||
 539                                     le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
 540                                     usblp->quirks & USBLP_QUIRK_BIDIR) {
 541                                         retval = -EINVAL;
 542                                         goto done;
 543                                 }
 544
 545                                 err = usblp_hp_channel_change_request(usblp,
 546                                         arg, &newChannel);
 547                                 if (err < 0) {
 548                                         err("usblp%d: error = %d setting "
 549                                                 "HP channel",
 550                                                 usblp->minor, err);
 551                                         retval = -EIO;
 552                                         goto done;
 553                                 }
 554
 555                                 dbg("usblp%d requested/got HP channel %ld/%d",
 556                                         usblp->minor, arg, newChannel);
 557                                 break;
 558
 559                         case IOCNR_GET_BUS_ADDRESS:
 560                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 561                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 562                                         retval = -EINVAL;
 563                                         goto done;
 564                                 }
 565
 566                                 twoints[0] = usblp->dev->bus->busnum;
 567                                 twoints[1] = usblp->dev->devnum;
 568                                 if (copy_to_user((void __user *)arg,
 569                                                 (unsigned char *)twoints,
 570                                                 sizeof(twoints))) {
 571                                         retval = -EFAULT;
 572                                         goto done;
 573                                 }
 574
 575                                 dbg("usblp%d is bus=%d, device=%d",
 576                                         usblp->minor, twoints[0], twoints[1]);
 577                                 break;
 578
 579                         case IOCNR_GET_VID_PID:
 580                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 581                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 582                                         retval = -EINVAL;
 583                                         goto done;
 584                                 }
 585
 586                                 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
 587                                 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
 588                                 if (copy_to_user((void __user *)arg,
 589                                                 (unsigned char *)twoints,
 590                                                 sizeof(twoints))) {
 591                                         retval = -EFAULT;
 592                                         goto done;
 593                                 }
 594
 595                                 dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X",
 596                                         usblp->minor, twoints[0], twoints[1]);
 597                                 break;
 598
 599                         case IOCNR_SOFT_RESET:
 600                                 if (_IOC_DIR(cmd) != _IOC_NONE) {
 601                                         retval = -EINVAL;
 602                                         goto done;
 603                                 }
 604                                 retval = usblp_reset(usblp);
 605                                 break;
 606                         default:
 607                                 retval = -ENOTTY;
 608                 }
 609         else    /* old-style ioctl value */
 610                 switch (cmd) {
 611
 612                         case LPGETSTATUS:
 613                                 if (usblp_read_status(usblp, usblp->statusbuf)) {
 614                                         if (printk_ratelimit())
 615                                                 err("usblp%d: failed reading printer status",
 616                                                         usblp->minor);
 617                                         retval = -EIO;
 618                                         goto done;
 619                                 }
 620                                 status = *usblp->statusbuf;
 621                                 if (copy_to_user ((void __user *)arg, &status, sizeof(int)))
 622                                         retval = -EFAULT;
 623                                 break;
 624
 625                         default:
 626                                 retval = -ENOTTY;
 627                 }
 628
 629 done:
 630         up (&usblp->sem);
 631         return retval;
 632 }
 633
 634 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 635 {
 636         struct usblp *usblp = file->private_data;
 637         int timeout, rv, err = 0, transfer_length = 0;
 638         size_t writecount = 0;
 639
 640         while (writecount < count) {
 641                 if (!usblp->wcomplete) {
 642                         barrier();
 643                         if (file->f_flags & O_NONBLOCK) {
 644                                 writecount += transfer_length;
 645                                 return writecount ? writecount : -EAGAIN;
 646                         }
 647
 648                         timeout = USBLP_WRITE_TIMEOUT;
 649
 650                         rv = wait_event_interruptible_timeout(usblp->wait, usblp->wcomplete || !usblp->present , timeout);
 651                         if (rv < 0)
 652                                 return writecount ? writecount : -EINTR;
 653                 }
 654                 down (&usblp->sem);
 655                 if (!usblp->present) {
 656                         up (&usblp->sem);
 657                         return -ENODEV;
 658                 }
 659
 660                 if (usblp->writeurb->status != 0) {
 661                         if (usblp->quirks & USBLP_QUIRK_BIDIR) {
 662                                 if (!usblp->wcomplete)
 663                                         err("usblp%d: error %d writing to printer",
 664                                                 usblp->minor, usblp->writeurb->status);
 665                                 err = usblp->writeurb->status;
 666                         } else
 667                                 err = usblp_check_status(usblp, err);
 668                         up (&usblp->sem);
 669
 670                         /* if the fault was due to disconnect, let khubd's
 671                          * call to usblp_disconnect() grab usblp->sem ...
 672                          */
 673                         schedule ();
 674                         continue;
 675                 }
 676
 677                 /* We must increment writecount here, and not at the
 678                  * end of the loop. Otherwise, the final loop iteration may
 679                  * be skipped, leading to incomplete printer output.
 680                  */
 681                 writecount += transfer_length;
 682                 if (writecount == count) {
 683                         up(&usblp->sem);
 684                         break;
 685                 }
 686
 687                 transfer_length=(count - writecount);
 688                 if (transfer_length > USBLP_BUF_SIZE)
 689                         transfer_length = USBLP_BUF_SIZE;
 690
 691                 usblp->writeurb->transfer_buffer_length = transfer_length;
 692
 693                 if (copy_from_user(usblp->writeurb->transfer_buffer,
 694                                    buffer + writecount, transfer_length)) {
 695                         up(&usblp->sem);
 696                         return writecount ? writecount : -EFAULT;
 697                 }
 698
 699                 usblp->writeurb->dev = usblp->dev;
 700                 usblp->wcomplete = 0;
 701                 err = usb_submit_urb(usblp->writeurb, GFP_KERNEL);
 702                 if (err) {
 703                         if (err != -ENOMEM)
 704                                 count = -EIO;
 705                         else
 706                                 count = writecount ? writecount : -ENOMEM;
 707                         up (&usblp->sem);
 708                         break;
 709                 }
 710                 up (&usblp->sem);
 711         }
 712
 713         return count;
 714 }
 715
 716 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 717 {
 718         struct usblp *usblp = file->private_data;
 719         int rv;
 720
 721         if (!usblp->bidir)
 722                 return -EINVAL;
 723
 724         down (&usblp->sem);
 725         if (!usblp->present) {
 726                 count = -ENODEV;
 727                 goto done;
 728         }
 729
 730         if (!usblp->rcomplete) {
 731                 barrier();
 732
 733                 if (file->f_flags & O_NONBLOCK) {
 734                         count = -EAGAIN;
 735                         goto done;
 736                 }
 737                 up(&usblp->sem);
 738                 rv = wait_event_interruptible(usblp->wait, usblp->rcomplete || !usblp->present);
 739                 down(&usblp->sem);
 740                 if (rv < 0) {
 741                         count = -EINTR;
 742                         goto done;
 743                 }
 744         }
 745
 746         if (!usblp->present) {
 747                 count = -ENODEV;
 748                 goto done;
 749         }
 750
 751         if (usblp->readurb->status) {
 752                 err("usblp%d: error %d reading from printer",
 753                         usblp->minor, usblp->readurb->status);
 754                 usblp->readurb->dev = usblp->dev;
 755                 usblp->readcount = 0;
 756                 usblp->rcomplete = 0;
 757                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0)
 758                         dbg("error submitting urb");
 759                 count = -EIO;
 760                 goto done;
 761         }
 762
 763         count = count < usblp->readurb->actual_length - usblp->readcount ?
 764                 count : usblp->readurb->actual_length - usblp->readcount;
 765
 766         if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) {
 767                 count = -EFAULT;
 768                 goto done;
 769         }
 770
 771         if ((usblp->readcount += count) == usblp->readurb->actual_length) {
 772                 usblp->readcount = 0;
 773                 usblp->readurb->dev = usblp->dev;
 774                 usblp->rcomplete = 0;
 775                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL)) {
 776                         count = -EIO;
 777                         goto done;
 778                 }
 779         }
 780
 781 done:
 782         up (&usblp->sem);
 783         return count;
 784 }
 785
 786 /*
 787  * Checks for printers that have quirks, such as requiring unidirectional
 788  * communication but reporting bidirectional; currently some HP printers
 789  * have this flaw (HP 810, 880, 895, etc.), or needing an init string
 790  * sent at each open (like some Epsons).
 791  * Returns 1 if found, 0 if not found.
 792  *
 793  * HP recommended that we use the bidirectional interface but
 794  * don't attempt any bulk IN transfers from the IN endpoint.
 795  * Here's some more detail on the problem:
 796  * The problem is not that it isn't bidirectional though. The problem
 797  * is that if you request a device ID, or status information, while
 798  * the buffers are full, the return data will end up in the print data
 799  * buffer. For example if you make sure you never request the device ID
 800  * while you are sending print data, and you don't try to query the
 801  * printer status every couple of milliseconds, you will probably be OK.
 802  */
 803 static unsigned int usblp_quirks (__u16 vendor, __u16 product)
 804 {
 805         int i;
 806
 807         for (i = 0; quirk_printers[i].vendorId; i++) {
 808                 if (vendor == quirk_printers[i].vendorId &&
 809                     product == quirk_printers[i].productId)
 810                         return quirk_printers[i].quirks;
 811         }
 812         return 0;
 813 }
 814
 815 static struct file_operations usblp_fops = {
 816         .owner =        THIS_MODULE,
 817         .read =         usblp_read,
 818         .write =        usblp_write,
 819         .poll =         usblp_poll,
 820         .unlocked_ioctl =       usblp_ioctl,
 821         .compat_ioctl =         usblp_ioctl,
 822         .open =         usblp_open,
 823         .release =      usblp_release,
 824 };
 825
 826 static struct usb_class_driver usblp_class = {
 827         .name =         "lp%d",
 828         .fops =         &usblp_fops,
 829         .minor_base =   USBLP_MINOR_BASE,
 830 };
 831
 832 static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf)
 833 {
 834         struct usb_interface *intf = to_usb_interface(dev);
 835         struct usblp *usblp = usb_get_intfdata (intf);
 836
 837         if (usblp->device_id_string[0] == 0 &&
 838             usblp->device_id_string[1] == 0)
 839                 return 0;
 840
 841         return sprintf(buf, "%s", usblp->device_id_string+2);
 842 }
 843
 844 static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL);
 845
 846 static int usblp_probe(struct usb_interface *intf,
 847                        const struct usb_device_id *id)
 848 {
 849         struct usb_device *dev = interface_to_usbdev (intf);
 850         struct usblp *usblp = NULL;
 851         int protocol;
 852         int retval;
 853
 854         /* Malloc and start initializing usblp structure so we can use it
 855          * directly. */
 856         if (!(usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL))) {
 857                 err("out of memory for usblp");
 858                 goto abort;
 859         }
 860         usblp->dev = dev;
 861         init_MUTEX (&usblp->sem);
 862         init_waitqueue_head(&usblp->wait);
 863         usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
 864         usblp->intf = intf;
 865
 866         usblp->writeurb = usb_alloc_urb(0, GFP_KERNEL);
 867         if (!usblp->writeurb) {
 868                 err("out of memory");
 869                 goto abort;
 870         }
 871         usblp->readurb = usb_alloc_urb(0, GFP_KERNEL);
 872         if (!usblp->readurb) {
 873                 err("out of memory");
 874                 goto abort;
 875         }
 876
 877         /* Malloc device ID string buffer to the largest expected length,
 878          * since we can re-query it on an ioctl and a dynamic string
 879          * could change in length. */
 880         if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
 881                 err("out of memory for device_id_string");
 882                 goto abort;
 883         }
 884
 885         usblp->writebuf = usblp->readbuf = NULL;
 886         usblp->writeurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 887         usblp->readurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 888         /* Malloc write & read buffers.  We somewhat wastefully
 889          * malloc both regardless of bidirectionality, because the
 890          * alternate setting can be changed later via an ioctl. */
 891         if (!(usblp->writebuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
 892                                 GFP_KERNEL, &usblp->writeurb->transfer_dma))) {
 893                 err("out of memory for write buf");
 894                 goto abort;
 895         }
 896         if (!(usblp->readbuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
 897                                 GFP_KERNEL, &usblp->readurb->transfer_dma))) {
 898                 err("out of memory for read buf");
 899                 goto abort;
 900         }
 901
 902         /* Allocate buffer for printer status */
 903         usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
 904         if (!usblp->statusbuf) {
 905                 err("out of memory for statusbuf");
 906                 goto abort;
 907         }
 908
 909         /* Lookup quirks for this printer. */
 910         usblp->quirks = usblp_quirks(
 911                 le16_to_cpu(dev->descriptor.idVendor),
 912                 le16_to_cpu(dev->descriptor.idProduct));
 913
 914         /* Analyze and pick initial alternate settings and endpoints. */
 915         protocol = usblp_select_alts(usblp);
 916         if (protocol < 0) {
 917                 dbg("incompatible printer-class device 0x%4.4X/0x%4.4X",
 918                         le16_to_cpu(dev->descriptor.idVendor),
 919                         le16_to_cpu(dev->descriptor.idProduct));
 920                 goto abort;
 921         }
 922
 923         /* Setup the selected alternate setting and endpoints. */
 924         if (usblp_set_protocol(usblp, protocol) < 0)
 925                 goto abort;
 926
 927         /* Retrieve and store the device ID string. */
 928         usblp_cache_device_id_string(usblp);
 929         device_create_file(&intf->dev, &dev_attr_ieee1284_id);
 930
 931 #ifdef DEBUG
 932         usblp_check_status(usblp, 0);
 933 #endif
 934
 935         usb_set_intfdata (intf, usblp);
 936
 937         usblp->present = 1;
 938
 939         retval = usb_register_dev(intf, &usblp_class);
 940         if (retval) {
 941                 err("Not able to get a minor for this device.");
 942                 goto abort_intfdata;
 943         }
 944         usblp->minor = intf->minor;
 945         info("usblp%d: USB %sdirectional printer dev %d "
 946                 "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X",
 947                 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
 948                 usblp->ifnum,
 949                 usblp->protocol[usblp->current_protocol].alt_setting,
 950                 usblp->current_protocol,
 951                 le16_to_cpu(usblp->dev->descriptor.idVendor),
 952                 le16_to_cpu(usblp->dev->descriptor.idProduct));
 953
 954         return 0;
 955
 956 abort_intfdata:
 957         usb_set_intfdata (intf, NULL);
 958         device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
 959 abort:
 960         if (usblp) {
 961                 if (usblp->writebuf)
 962                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 963                                 usblp->writebuf, usblp->writeurb->transfer_dma);
 964                 if (usblp->readbuf)
 965                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 966                                 usblp->readbuf, usblp->writeurb->transfer_dma);
 967                 kfree(usblp->statusbuf);
 968                 kfree(usblp->device_id_string);
 969                 usb_free_urb(usblp->writeurb);
 970                 usb_free_urb(usblp->readurb);
 971                 kfree(usblp);
 972         }
 973         return -EIO;
 974 }
 975
 976 /*
 977  * We are a "new" style driver with usb_device_id table,
 978  * but our requirements are too intricate for simple match to handle.
 979  *
 980  * The "proto_bias" option may be used to specify the preferred protocol
 981  * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3).  If the device
 982  * supports the preferred protocol, then we bind to it.
 983  *
 984  * The best interface for us is 7/1/2, because it is compatible
 985  * with a stream of characters. If we find it, we bind to it.
 986  *
 987  * Note that the people from hpoj.sourceforge.net need to be able to
 988  * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
 989  *
 990  * Failing 7/1/2, we look for 7/1/3, even though it's probably not
 991  * stream-compatible, because this matches the behaviour of the old code.
 992  *
 993  * If nothing else, we bind to 7/1/1 - the unidirectional interface.
 994  */
 995 static int usblp_select_alts(struct usblp *usblp)
 996 {
 997         struct usb_interface *if_alt;
 998         struct usb_host_interface *ifd;
 999         struct usb_endpoint_descriptor *epd, *epwrite, *epread;
1000         int p, i, e;
1001
1002         if_alt = usblp->intf;
1003
1004         for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1005                 usblp->protocol[p].alt_setting = -1;
1006
1007         /* Find out what we have. */
1008         for (i = 0; i < if_alt->num_altsetting; i++) {
1009                 ifd = &if_alt->altsetting[i];
1010
1011                 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
1012                         continue;
1013
1014                 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1015                     ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1016                         continue;
1017
1018                 /* Look for bulk OUT and IN endpoints. */
1019                 epwrite = epread = NULL;
1020                 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1021                         epd = &ifd->endpoint[e].desc;
1022
1023                         if ((epd->bmAttributes&USB_ENDPOINT_XFERTYPE_MASK)!=
1024                             USB_ENDPOINT_XFER_BULK)
1025                                 continue;
1026
1027                         if (!(epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK)) {
1028                                 if (!epwrite)
1029                                         epwrite = epd;
1030
1031                         } else {
1032                                 if (!epread)
1033                                         epread = epd;
1034                         }
1035                 }
1036
1037                 /* Ignore buggy hardware without the right endpoints. */
1038                 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1039                         continue;
1040
1041                 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1042                  * and buggy bidirectional printers. */
1043                 if (ifd->desc.bInterfaceProtocol == 1) {
1044                         epread = NULL;
1045                 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1046                         info("Disabling reads from problem bidirectional "
1047                                 "printer on usblp%d", usblp->minor);
1048                         epread = NULL;
1049                 }
1050
1051                 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1052                                 ifd->desc.bAlternateSetting;
1053                 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1054                 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1055         }
1056
1057         /* If our requested protocol is supported, then use it. */
1058         if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1059             proto_bias <= USBLP_LAST_PROTOCOL &&
1060             usblp->protocol[proto_bias].alt_setting != -1)
1061                 return proto_bias;
1062
1063         /* Ordering is important here. */
1064         if (usblp->protocol[2].alt_setting != -1)
1065                 return 2;
1066         if (usblp->protocol[1].alt_setting != -1)
1067                 return 1;
1068         if (usblp->protocol[3].alt_setting != -1)
1069                 return 3;
1070
1071         /* If nothing is available, then don't bind to this device. */
1072         return -1;
1073 }
1074
1075 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1076 {
1077         int r, alts;
1078
1079         if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1080                 return -EINVAL;
1081
1082         alts = usblp->protocol[protocol].alt_setting;
1083         if (alts < 0)
1084                 return -EINVAL;
1085         r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1086         if (r < 0) {
1087                 err("can't set desired altsetting %d on interface %d",
1088                         alts, usblp->ifnum);
1089                 return r;
1090         }
1091
1092         usb_fill_bulk_urb(usblp->writeurb, usblp->dev,
1093                 usb_sndbulkpipe(usblp->dev,
1094                   usblp->protocol[protocol].epwrite->bEndpointAddress),
1095                 usblp->writebuf, 0,
1096                 usblp_bulk_write, usblp);
1097
1098         usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1099         if (usblp->bidir)
1100                 usb_fill_bulk_urb(usblp->readurb, usblp->dev,
1101                         usb_rcvbulkpipe(usblp->dev,
1102                           usblp->protocol[protocol].epread->bEndpointAddress),
1103                         usblp->readbuf, USBLP_BUF_SIZE,
1104                         usblp_bulk_read, usblp);
1105
1106         usblp->current_protocol = protocol;
1107         dbg("usblp%d set protocol %d", usblp->minor, protocol);
1108         return 0;
1109 }
1110
1111 /* Retrieves and caches device ID string.
1112  * Returns length, including length bytes but not null terminator.
1113  * On error, returns a negative errno value. */
1114 static int usblp_cache_device_id_string(struct usblp *usblp)
1115 {
1116         int err, length;
1117
1118         err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1119         if (err < 0) {
1120                 dbg("usblp%d: error = %d reading IEEE-1284 Device ID string",
1121                         usblp->minor, err);
1122                 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1123                 return -EIO;
1124         }
1125
1126         /* First two bytes are length in big-endian.
1127          * They count themselves, and we copy them into
1128          * the user's buffer. */
1129         length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1130         if (length < 2)
1131                 length = 2;
1132         else if (length >= USBLP_DEVICE_ID_SIZE)
1133                 length = USBLP_DEVICE_ID_SIZE - 1;
1134         usblp->device_id_string[length] = '\0';
1135
1136         dbg("usblp%d Device ID string [len=%d]=\"%s\"",
1137                 usblp->minor, length, &usblp->device_id_string[2]);
1138
1139         return length;
1140 }
1141
1142 static void usblp_disconnect(struct usb_interface *intf)
1143 {
1144         struct usblp *usblp = usb_get_intfdata (intf);
1145
1146         usb_deregister_dev(intf, &usblp_class);
1147
1148         if (!usblp || !usblp->dev) {
1149                 err("bogus disconnect");
1150                 BUG ();
1151         }
1152
1153         device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1154
1155         down (&usblp_sem);
1156         down (&usblp->sem);
1157         usblp->present = 0;
1158         usb_set_intfdata (intf, NULL);
1159
1160         usblp_unlink_urbs(usblp);
1161         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1162                         usblp->writebuf, usblp->writeurb->transfer_dma);
1163         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1164                         usblp->readbuf, usblp->readurb->transfer_dma);
1165         up (&usblp->sem);
1166
1167         if (!usblp->used)
1168                 usblp_cleanup (usblp);
1169         up (&usblp_sem);
1170 }
1171
1172 static struct usb_device_id usblp_ids [] = {
1173         { USB_DEVICE_INFO(7, 1, 1) },
1174         { USB_DEVICE_INFO(7, 1, 2) },
1175         { USB_DEVICE_INFO(7, 1, 3) },
1176         { USB_INTERFACE_INFO(7, 1, 1) },
1177         { USB_INTERFACE_INFO(7, 1, 2) },
1178         { USB_INTERFACE_INFO(7, 1, 3) },
1179         { }                                             /* Terminating entry */
1180 };
1181
1182 MODULE_DEVICE_TABLE (usb, usblp_ids);
1183
1184 static struct usb_driver usblp_driver = {
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                 info(DRIVER_VERSION ": " DRIVER_DESC);
1197
1198         return retval;
1199 }
1200
1201 static void __exit usblp_exit(void)
1202 {
1203         usb_deregister(&usblp_driver);
1204 }
1205
1206 module_init(usblp_init);
1207 module_exit(usblp_exit);
1208
1209 MODULE_AUTHOR( DRIVER_AUTHOR );
1210 MODULE_DESCRIPTION( DRIVER_DESC );
1211 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1212 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1213 MODULE_LICENSE("GPL");