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 #include <linux/mutex.h>
  59 #undef DEBUG
  60 #include <linux/usb.h>
  61
  62 /*
  63  * Version Information
  64  */
  65 #define DRIVER_VERSION "v0.13"
  66 #define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal"
  67 #define DRIVER_DESC "USB Printer Device Class driver"
  68
  69 #define USBLP_BUF_SIZE          8192
  70 #define USBLP_DEVICE_ID_SIZE    1024
  71
  72 /* ioctls: */
  73 #define LPGETSTATUS             0x060b          /* same as in drivers/char/lp.c */
  74 #define IOCNR_GET_DEVICE_ID             1
  75 #define IOCNR_GET_PROTOCOLS             2
  76 #define IOCNR_SET_PROTOCOL              3
  77 #define IOCNR_HP_SET_CHANNEL            4
  78 #define IOCNR_GET_BUS_ADDRESS           5
  79 #define IOCNR_GET_VID_PID               6
  80 #define IOCNR_SOFT_RESET                7
  81 /* Get device_id string: */
  82 #define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len)
  83 /* The following ioctls were added for http://hpoj.sourceforge.net: */
  84 /* Get two-int array:
  85  * [0]=current protocol (1=7/1/1, 2=7/1/2, 3=7/1/3),
  86  * [1]=supported protocol mask (mask&(1<<n)!=0 means 7/1/n supported): */
  87 #define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
  88 /* Set protocol (arg: 1=7/1/1, 2=7/1/2, 3=7/1/3): */
  89 #define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0)
  90 /* Set channel number (HP Vendor-specific command): */
  91 #define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0)
  92 /* Get two-int array: [0]=bus number, [1]=device address: */
  93 #define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len)
  94 /* Get two-int array: [0]=vendor ID, [1]=product ID: */
  95 #define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len)
  96 /* Perform class specific soft reset */
  97 #define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0);
  98
  99 /*
 100  * A DEVICE_ID string may include the printer's serial number.
 101  * It should end with a semi-colon (';').
 102  * An example from an HP 970C DeskJet printer is (this is one long string,
 103  * with the serial number changed):
 104 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:                    ;
 105  */
 106
 107 /*
 108  * USB Printer Requests
 109  */
 110
 111 #define USBLP_REQ_GET_ID                        0x00
 112 #define USBLP_REQ_GET_STATUS                    0x01
 113 #define USBLP_REQ_RESET                         0x02
 114 #define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST     0x00    /* HP Vendor-specific */
 115
 116 #define USBLP_MINORS            16
 117 #define USBLP_MINOR_BASE        0
 118
 119 #define USBLP_WRITE_TIMEOUT     (5000)                  /* 5 seconds */
 120
 121 #define USBLP_FIRST_PROTOCOL    1
 122 #define USBLP_LAST_PROTOCOL     3
 123 #define USBLP_MAX_PROTOCOLS     (USBLP_LAST_PROTOCOL+1)
 124
 125 /*
 126  * some arbitrary status buffer size;
 127  * need a status buffer that is allocated via kmalloc(), not on stack
 128  */
 129 #define STATUS_BUF_SIZE         8
 130
 131 struct usblp {
 132         struct usb_device       *dev;                   /* USB device */
 133         struct mutex            mut;                    /* locks this struct, especially "dev" */
 134         char                    *writebuf;              /* write transfer_buffer */
 135         char                    *readbuf;               /* read transfer_buffer */
 136         char                    *statusbuf;             /* status transfer_buffer */
 137         struct urb              *readurb, *writeurb;    /* The urbs */
 138         wait_queue_head_t       wait;                   /* Zzzzz ... */
 139         int                     readcount;              /* Counter for reads */
 140         int                     ifnum;                  /* Interface number */
 141         struct usb_interface    *intf;                  /* The interface */
 142         /* Alternate-setting numbers and endpoints for each protocol
 143          * (7/1/{index=1,2,3}) that the device supports: */
 144         struct {
 145                 int                             alt_setting;
 146                 struct usb_endpoint_descriptor  *epwrite;
 147                 struct usb_endpoint_descriptor  *epread;
 148         }                       protocol[USBLP_MAX_PROTOCOLS];
 149         int                     current_protocol;
 150         int                     minor;                  /* minor number of device */
 151         int                     wcomplete;              /* writing is completed */
 152         int                     rcomplete;              /* reading is completed */
 153         unsigned int            quirks;                 /* quirks flags */
 154         unsigned char           used;                   /* True if open */
 155         unsigned char           present;                /* True if not disconnected */
 156         unsigned char           bidir;                  /* interface is bidirectional */
 157         unsigned char           sleeping;               /* interface is suspended */
 158         unsigned char           *device_id_string;      /* IEEE 1284 DEVICE ID string (ptr) */
 159                                                         /* first 2 bytes are (big-endian) length */
 160 };
 161
 162 #ifdef DEBUG
 163 static void usblp_dump(struct usblp *usblp) {
 164         int p;
 165
 166         dbg("usblp=0x%p", usblp);
 167         dbg("dev=0x%p", usblp->dev);
 168         dbg("present=%d", usblp->present);
 169         dbg("readbuf=0x%p", usblp->readbuf);
 170         dbg("writebuf=0x%p", usblp->writebuf);
 171         dbg("readurb=0x%p", usblp->readurb);
 172         dbg("writeurb=0x%p", usblp->writeurb);
 173         dbg("readcount=%d", usblp->readcount);
 174         dbg("ifnum=%d", usblp->ifnum);
 175     for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
 176         dbg("protocol[%d].alt_setting=%d", p, usblp->protocol[p].alt_setting);
 177         dbg("protocol[%d].epwrite=%p", p, usblp->protocol[p].epwrite);
 178         dbg("protocol[%d].epread=%p", p, usblp->protocol[p].epread);
 179     }
 180         dbg("current_protocol=%d", usblp->current_protocol);
 181         dbg("minor=%d", usblp->minor);
 182         dbg("wcomplete=%d", usblp->wcomplete);
 183         dbg("rcomplete=%d", usblp->rcomplete);
 184         dbg("quirks=%d", usblp->quirks);
 185         dbg("used=%d", usblp->used);
 186         dbg("bidir=%d", usblp->bidir);
 187         dbg("sleeping=%d", usblp->sleeping);
 188         dbg("device_id_string=\"%s\"",
 189                 usblp->device_id_string ?
 190                         usblp->device_id_string + 2 :
 191                         (unsigned char *)"(null)");
 192 }
 193 #endif
 194
 195 /* Quirks: various printer quirks are handled by this table & its flags. */
 196
 197 struct quirk_printer_struct {
 198         __u16 vendorId;
 199         __u16 productId;
 200         unsigned int quirks;
 201 };
 202
 203 #define USBLP_QUIRK_BIDIR       0x1     /* reports bidir but requires unidirectional mode (no INs/reads) */
 204 #define USBLP_QUIRK_USB_INIT    0x2     /* needs vendor USB init string */
 205
 206 static const struct quirk_printer_struct quirk_printers[] = {
 207         { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
 208         { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
 209         { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
 210         { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
 211         { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
 212         { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
 213         { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */
 214         { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */
 215         { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
 216         { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
 217         { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
 218         { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
 219         { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
 220         { 0x0482, 0x0010, USBLP_QUIRK_BIDIR }, /* Kyocera Mita FS 820, by zut <kernel@zut.de> */
 221         { 0, 0 }
 222 };
 223
 224 static int usblp_select_alts(struct usblp *usblp);
 225 static int usblp_set_protocol(struct usblp *usblp, int protocol);
 226 static int usblp_cache_device_id_string(struct usblp *usblp);
 227
 228 /* forward reference to make our lives easier */
 229 static struct usb_driver usblp_driver;
 230 static DEFINE_MUTEX(usblp_mutex);       /* locks the existence of usblp's */
 231
 232 /*
 233  * Functions for usblp control messages.
 234  */
 235
 236 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
 237 {
 238         int retval;
 239         int index = usblp->ifnum;
 240
 241         /* High byte has the interface index.
 242            Low byte has the alternate setting.
 243          */
 244         if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) {
 245           index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
 246         }
 247
 248         retval = usb_control_msg(usblp->dev,
 249                 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
 250                 request, type | dir | recip, value, index, buf, len, USBLP_WRITE_TIMEOUT);
 251         dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d",
 252                 request, !!dir, recip, value, index, len, retval);
 253         return retval < 0 ? retval : 0;
 254 }
 255
 256 #define usblp_read_status(usblp, status)\
 257         usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
 258 #define usblp_get_id(usblp, config, id, maxlen)\
 259         usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
 260 #define usblp_reset(usblp)\
 261         usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
 262
 263 #define usblp_hp_channel_change_request(usblp, channel, buffer) \
 264         usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
 265
 266 /*
 267  * See the description for usblp_select_alts() below for the usage
 268  * explanation.  Look into your /proc/bus/usb/devices and dmesg in
 269  * case of any trouble.
 270  */
 271 static int proto_bias = -1;
 272
 273 /*
 274  * URB callback.
 275  */
 276
 277 static void usblp_bulk_read(struct urb *urb)
 278 {
 279         struct usblp *usblp = urb->context;
 280
 281         if (unlikely(!usblp || !usblp->dev || !usblp->used))
 282                 return;
 283
 284         if (unlikely(!usblp->present))
 285                 goto unplug;
 286         if (unlikely(urb->status))
 287                 warn("usblp%d: nonzero read/write bulk status received: %d",
 288                         usblp->minor, urb->status);
 289         usblp->rcomplete = 1;
 290 unplug:
 291         wake_up_interruptible(&usblp->wait);
 292 }
 293
 294 static void usblp_bulk_write(struct urb *urb)
 295 {
 296         struct usblp *usblp = urb->context;
 297
 298         if (unlikely(!usblp || !usblp->dev || !usblp->used))
 299                 return;
 300         if (unlikely(!usblp->present))
 301                 goto unplug;
 302         if (unlikely(urb->status))
 303                 warn("usblp%d: nonzero read/write bulk status received: %d",
 304                         usblp->minor, urb->status);
 305         usblp->wcomplete = 1;
 306 unplug:
 307         wake_up_interruptible(&usblp->wait);
 308 }
 309
 310 /*
 311  * Get and print printer errors.
 312  */
 313
 314 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
 315
 316 static int usblp_check_status(struct usblp *usblp, int err)
 317 {
 318         unsigned char status, newerr = 0;
 319         int error;
 320
 321         error = usblp_read_status (usblp, usblp->statusbuf);
 322         if (error < 0) {
 323                 if (printk_ratelimit())
 324                         err("usblp%d: error %d reading printer status",
 325                                 usblp->minor, error);
 326                 return 0;
 327         }
 328
 329         status = *usblp->statusbuf;
 330
 331         if (~status & LP_PERRORP)
 332                 newerr = 3;
 333         if (status & LP_POUTPA)
 334                 newerr = 1;
 335         if (~status & LP_PSELECD)
 336                 newerr = 2;
 337
 338         if (newerr != err)
 339                 info("usblp%d: %s", usblp->minor, usblp_messages[newerr]);
 340
 341         return newerr;
 342 }
 343
 344 static int handle_bidir (struct usblp *usblp)
 345 {
 346         if (usblp->bidir && usblp->used && !usblp->sleeping) {
 347                 usblp->readcount = 0;
 348                 usblp->readurb->dev = usblp->dev;
 349                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) {
 350                         usblp->used = 0;
 351                         return -EIO;
 352                 }
 353         }
 354
 355         return 0;
 356 }
 357
 358 /*
 359  * File op functions.
 360  */
 361
 362 static int usblp_open(struct inode *inode, struct file *file)
 363 {
 364         int minor = iminor(inode);
 365         struct usblp *usblp;
 366         struct usb_interface *intf;
 367         int retval;
 368
 369         if (minor < 0)
 370                 return -ENODEV;
 371
 372         mutex_lock (&usblp_mutex);
 373
 374         retval = -ENODEV;
 375         intf = usb_find_interface(&usblp_driver, minor);
 376         if (!intf) {
 377                 goto out;
 378         }
 379         usblp = usb_get_intfdata (intf);
 380         if (!usblp || !usblp->dev || !usblp->present)
 381                 goto out;
 382
 383         retval = -EBUSY;
 384         if (usblp->used)
 385                 goto out;
 386
 387         /*
 388          * TODO: need to implement LP_ABORTOPEN + O_NONBLOCK as in drivers/char/lp.c ???
 389          * This is #if 0-ed because we *don't* want to fail an open
 390          * just because the printer is off-line.
 391          */
 392 #if 0
 393         if ((retval = usblp_check_status(usblp, 0))) {
 394                 retval = retval > 1 ? -EIO : -ENOSPC;
 395                 goto out;
 396         }
 397 #else
 398         retval = 0;
 399 #endif
 400
 401         usblp->used = 1;
 402         file->private_data = usblp;
 403
 404         usblp->writeurb->transfer_buffer_length = 0;
 405         usblp->wcomplete = 1; /* we begin writeable */
 406         usblp->rcomplete = 0;
 407         usblp->writeurb->status = 0;
 408         usblp->readurb->status = 0;
 409
 410         if (handle_bidir(usblp) < 0) {
 411                 file->private_data = NULL;
 412                 retval = -EIO;
 413         }
 414 out:
 415         mutex_unlock (&usblp_mutex);
 416         return retval;
 417 }
 418
 419 static void usblp_cleanup (struct usblp *usblp)
 420 {
 421         info("usblp%d: removed", usblp->minor);
 422
 423         kfree (usblp->device_id_string);
 424         kfree (usblp->statusbuf);
 425         usb_free_urb(usblp->writeurb);
 426         usb_free_urb(usblp->readurb);
 427         kfree (usblp);
 428 }
 429
 430 static void usblp_unlink_urbs(struct usblp *usblp)
 431 {
 432         usb_kill_urb(usblp->writeurb);
 433         if (usblp->bidir)
 434                 usb_kill_urb(usblp->readurb);
 435 }
 436
 437 static int usblp_release(struct inode *inode, struct file *file)
 438 {
 439         struct usblp *usblp = file->private_data;
 440
 441         mutex_lock (&usblp_mutex);
 442         usblp->used = 0;
 443         if (usblp->present) {
 444                 usblp_unlink_urbs(usblp);
 445         } else          /* finish cleanup from disconnect */
 446                 usblp_cleanup (usblp);
 447         mutex_unlock (&usblp_mutex);
 448         return 0;
 449 }
 450
 451 /* No kernel lock - fine */
 452 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
 453 {
 454         struct usblp *usblp = file->private_data;
 455         poll_wait(file, &usblp->wait, wait);
 456         return ((!usblp->bidir || !usblp->rcomplete) ? 0 : POLLIN  | POLLRDNORM)
 457                                | (!usblp->wcomplete ? 0 : POLLOUT | POLLWRNORM);
 458 }
 459
 460 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 461 {
 462         struct usblp *usblp = file->private_data;
 463         int length, err, i;
 464         unsigned char newChannel;
 465         int status;
 466         int twoints[2];
 467         int retval = 0;
 468
 469         mutex_lock (&usblp->mut);
 470         if (!usblp->present) {
 471                 retval = -ENODEV;
 472                 goto done;
 473         }
 474
 475         if (usblp->sleeping) {
 476                 retval = -ENODEV;
 477                 goto done;
 478         }
 479
 480         dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd),
 481                 _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd) );
 482
 483         if (_IOC_TYPE(cmd) == 'P')      /* new-style ioctl number */
 484
 485                 switch (_IOC_NR(cmd)) {
 486
 487                         case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
 488                                 if (_IOC_DIR(cmd) != _IOC_READ) {
 489                                         retval = -EINVAL;
 490                                         goto done;
 491                                 }
 492
 493                                 length = usblp_cache_device_id_string(usblp);
 494                                 if (length < 0) {
 495                                         retval = length;
 496                                         goto done;
 497                                 }
 498                                 if (length > _IOC_SIZE(cmd))
 499                                         length = _IOC_SIZE(cmd); /* truncate */
 500
 501                                 if (copy_to_user((void __user *) arg,
 502                                                 usblp->device_id_string,
 503                                                 (unsigned long) length)) {
 504                                         retval = -EFAULT;
 505                                         goto done;
 506                                 }
 507
 508                                 break;
 509
 510                         case IOCNR_GET_PROTOCOLS:
 511                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 512                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 513                                         retval = -EINVAL;
 514                                         goto done;
 515                                 }
 516
 517                                 twoints[0] = usblp->current_protocol;
 518                                 twoints[1] = 0;
 519                                 for (i = USBLP_FIRST_PROTOCOL;
 520                                      i <= USBLP_LAST_PROTOCOL; i++) {
 521                                         if (usblp->protocol[i].alt_setting >= 0)
 522                                                 twoints[1] |= (1<<i);
 523                                 }
 524
 525                                 if (copy_to_user((void __user *)arg,
 526                                                 (unsigned char *)twoints,
 527                                                 sizeof(twoints))) {
 528                                         retval = -EFAULT;
 529                                         goto done;
 530                                 }
 531
 532                                 break;
 533
 534                         case IOCNR_SET_PROTOCOL:
 535                                 if (_IOC_DIR(cmd) != _IOC_WRITE) {
 536                                         retval = -EINVAL;
 537                                         goto done;
 538                                 }
 539
 540 #ifdef DEBUG
 541                                 if (arg == -10) {
 542                                         usblp_dump(usblp);
 543                                         break;
 544                                 }
 545 #endif
 546
 547                                 usblp_unlink_urbs(usblp);
 548                                 retval = usblp_set_protocol(usblp, arg);
 549                                 if (retval < 0) {
 550                                         usblp_set_protocol(usblp,
 551                                                 usblp->current_protocol);
 552                                 }
 553                                 break;
 554
 555                         case IOCNR_HP_SET_CHANNEL:
 556                                 if (_IOC_DIR(cmd) != _IOC_WRITE ||
 557                                     le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
 558                                     usblp->quirks & USBLP_QUIRK_BIDIR) {
 559                                         retval = -EINVAL;
 560                                         goto done;
 561                                 }
 562
 563                                 err = usblp_hp_channel_change_request(usblp,
 564                                         arg, &newChannel);
 565                                 if (err < 0) {
 566                                         err("usblp%d: error = %d setting "
 567                                                 "HP channel",
 568                                                 usblp->minor, err);
 569                                         retval = -EIO;
 570                                         goto done;
 571                                 }
 572
 573                                 dbg("usblp%d requested/got HP channel %ld/%d",
 574                                         usblp->minor, arg, newChannel);
 575                                 break;
 576
 577                         case IOCNR_GET_BUS_ADDRESS:
 578                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 579                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 580                                         retval = -EINVAL;
 581                                         goto done;
 582                                 }
 583
 584                                 twoints[0] = usblp->dev->bus->busnum;
 585                                 twoints[1] = usblp->dev->devnum;
 586                                 if (copy_to_user((void __user *)arg,
 587                                                 (unsigned char *)twoints,
 588                                                 sizeof(twoints))) {
 589                                         retval = -EFAULT;
 590                                         goto done;
 591                                 }
 592
 593                                 dbg("usblp%d is bus=%d, device=%d",
 594                                         usblp->minor, twoints[0], twoints[1]);
 595                                 break;
 596
 597                         case IOCNR_GET_VID_PID:
 598                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 599                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 600                                         retval = -EINVAL;
 601                                         goto done;
 602                                 }
 603
 604                                 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
 605                                 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
 606                                 if (copy_to_user((void __user *)arg,
 607                                                 (unsigned char *)twoints,
 608                                                 sizeof(twoints))) {
 609                                         retval = -EFAULT;
 610                                         goto done;
 611                                 }
 612
 613                                 dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X",
 614                                         usblp->minor, twoints[0], twoints[1]);
 615                                 break;
 616
 617                         case IOCNR_SOFT_RESET:
 618                                 if (_IOC_DIR(cmd) != _IOC_NONE) {
 619                                         retval = -EINVAL;
 620                                         goto done;
 621                                 }
 622                                 retval = usblp_reset(usblp);
 623                                 break;
 624                         default:
 625                                 retval = -ENOTTY;
 626                 }
 627         else    /* old-style ioctl value */
 628                 switch (cmd) {
 629
 630                         case LPGETSTATUS:
 631                                 if (usblp_read_status(usblp, usblp->statusbuf)) {
 632                                         if (printk_ratelimit())
 633                                                 err("usblp%d: failed reading printer status",
 634                                                         usblp->minor);
 635                                         retval = -EIO;
 636                                         goto done;
 637                                 }
 638                                 status = *usblp->statusbuf;
 639                                 if (copy_to_user ((void __user *)arg, &status, sizeof(int)))
 640                                         retval = -EFAULT;
 641                                 break;
 642
 643                         default:
 644                                 retval = -ENOTTY;
 645                 }
 646
 647 done:
 648         mutex_unlock (&usblp->mut);
 649         return retval;
 650 }
 651
 652 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 653 {
 654         struct usblp *usblp = file->private_data;
 655         int timeout, intr, rv, err = 0, transfer_length = 0;
 656         size_t writecount = 0;
 657
 658         while (writecount < count) {
 659                 if (!usblp->wcomplete) {
 660                         barrier();
 661                         if (file->f_flags & O_NONBLOCK) {
 662                                 writecount += transfer_length;
 663                                 return writecount ? writecount : -EAGAIN;
 664                         }
 665
 666                         timeout = USBLP_WRITE_TIMEOUT;
 667
 668                         rv = wait_event_interruptible_timeout(usblp->wait, usblp->wcomplete || !usblp->present , timeout);
 669                         if (rv < 0)
 670                                 return writecount ? writecount : -EINTR;
 671                 }
 672                 intr = mutex_lock_interruptible (&usblp->mut);
 673                 if (intr)
 674                         return writecount ? writecount : -EINTR;
 675                 if (!usblp->present) {
 676                         mutex_unlock (&usblp->mut);
 677                         return -ENODEV;
 678                 }
 679
 680                 if (usblp->sleeping) {
 681                         mutex_unlock (&usblp->mut);
 682                         return writecount ? writecount : -ENODEV;
 683                 }
 684
 685                 if (usblp->writeurb->status != 0) {
 686                         if (usblp->quirks & USBLP_QUIRK_BIDIR) {
 687                                 if (!usblp->wcomplete)
 688                                         err("usblp%d: error %d writing to printer",
 689                                                 usblp->minor, usblp->writeurb->status);
 690                                 err = usblp->writeurb->status;
 691                         } else
 692                                 err = usblp_check_status(usblp, err);
 693                         mutex_unlock (&usblp->mut);
 694
 695                         /* if the fault was due to disconnect, let khubd's
 696                          * call to usblp_disconnect() grab usblp->mut ...
 697                          */
 698                         schedule ();
 699                         continue;
 700                 }
 701
 702                 /* We must increment writecount here, and not at the
 703                  * end of the loop. Otherwise, the final loop iteration may
 704                  * be skipped, leading to incomplete printer output.
 705                  */
 706                 writecount += transfer_length;
 707                 if (writecount == count) {
 708                         mutex_unlock(&usblp->mut);
 709                         break;
 710                 }
 711
 712                 transfer_length=(count - writecount);
 713                 if (transfer_length > USBLP_BUF_SIZE)
 714                         transfer_length = USBLP_BUF_SIZE;
 715
 716                 usblp->writeurb->transfer_buffer_length = transfer_length;
 717
 718                 if (copy_from_user(usblp->writeurb->transfer_buffer,
 719                                    buffer + writecount, transfer_length)) {
 720                         mutex_unlock(&usblp->mut);
 721                         return writecount ? writecount : -EFAULT;
 722                 }
 723
 724                 usblp->writeurb->dev = usblp->dev;
 725                 usblp->wcomplete = 0;
 726                 err = usb_submit_urb(usblp->writeurb, GFP_KERNEL);
 727                 if (err) {
 728                         usblp->wcomplete = 1;
 729                         if (err != -ENOMEM)
 730                                 count = -EIO;
 731                         else
 732                                 count = writecount ? writecount : -ENOMEM;
 733                         mutex_unlock (&usblp->mut);
 734                         break;
 735                 }
 736                 mutex_unlock (&usblp->mut);
 737         }
 738
 739         return count;
 740 }
 741
 742 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 743 {
 744         struct usblp *usblp = file->private_data;
 745         int rv, intr;
 746
 747         if (!usblp->bidir)
 748                 return -EINVAL;
 749
 750         intr = mutex_lock_interruptible (&usblp->mut);
 751         if (intr)
 752                 return -EINTR;
 753         if (!usblp->present) {
 754                 count = -ENODEV;
 755                 goto done;
 756         }
 757
 758         if (!usblp->rcomplete) {
 759                 barrier();
 760
 761                 if (file->f_flags & O_NONBLOCK) {
 762                         count = -EAGAIN;
 763                         goto done;
 764                 }
 765                 mutex_unlock(&usblp->mut);
 766                 rv = wait_event_interruptible(usblp->wait, usblp->rcomplete || !usblp->present);
 767                 mutex_lock(&usblp->mut);
 768                 if (rv < 0) {
 769                         count = -EINTR;
 770                         goto done;
 771                 }
 772         }
 773
 774         if (!usblp->present) {
 775                 count = -ENODEV;
 776                 goto done;
 777         }
 778
 779         if (usblp->sleeping) {
 780                 count = -ENODEV;
 781                 goto done;
 782         }
 783
 784         if (usblp->readurb->status) {
 785                 err("usblp%d: error %d reading from printer",
 786                         usblp->minor, usblp->readurb->status);
 787                 usblp->readurb->dev = usblp->dev;
 788                 usblp->readcount = 0;
 789                 usblp->rcomplete = 0;
 790                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0)
 791                         dbg("error submitting urb");
 792                 count = -EIO;
 793                 goto done;
 794         }
 795
 796         count = count < usblp->readurb->actual_length - usblp->readcount ?
 797                 count : usblp->readurb->actual_length - usblp->readcount;
 798
 799         if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) {
 800                 count = -EFAULT;
 801                 goto done;
 802         }
 803
 804         if ((usblp->readcount += count) == usblp->readurb->actual_length) {
 805                 usblp->readcount = 0;
 806                 usblp->readurb->dev = usblp->dev;
 807                 usblp->rcomplete = 0;
 808                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL)) {
 809                         count = -EIO;
 810                         goto done;
 811                 }
 812         }
 813
 814 done:
 815         mutex_unlock (&usblp->mut);
 816         return count;
 817 }
 818
 819 /*
 820  * Checks for printers that have quirks, such as requiring unidirectional
 821  * communication but reporting bidirectional; currently some HP printers
 822  * have this flaw (HP 810, 880, 895, etc.), or needing an init string
 823  * sent at each open (like some Epsons).
 824  * Returns 1 if found, 0 if not found.
 825  *
 826  * HP recommended that we use the bidirectional interface but
 827  * don't attempt any bulk IN transfers from the IN endpoint.
 828  * Here's some more detail on the problem:
 829  * The problem is not that it isn't bidirectional though. The problem
 830  * is that if you request a device ID, or status information, while
 831  * the buffers are full, the return data will end up in the print data
 832  * buffer. For example if you make sure you never request the device ID
 833  * while you are sending print data, and you don't try to query the
 834  * printer status every couple of milliseconds, you will probably be OK.
 835  */
 836 static unsigned int usblp_quirks (__u16 vendor, __u16 product)
 837 {
 838         int i;
 839
 840         for (i = 0; quirk_printers[i].vendorId; i++) {
 841                 if (vendor == quirk_printers[i].vendorId &&
 842                     product == quirk_printers[i].productId)
 843                         return quirk_printers[i].quirks;
 844         }
 845         return 0;
 846 }
 847
 848 static const struct file_operations usblp_fops = {
 849         .owner =        THIS_MODULE,
 850         .read =         usblp_read,
 851         .write =        usblp_write,
 852         .poll =         usblp_poll,
 853         .unlocked_ioctl =       usblp_ioctl,
 854         .compat_ioctl =         usblp_ioctl,
 855         .open =         usblp_open,
 856         .release =      usblp_release,
 857 };
 858
 859 static struct usb_class_driver usblp_class = {
 860         .name =         "lp%d",
 861         .fops =         &usblp_fops,
 862         .minor_base =   USBLP_MINOR_BASE,
 863 };
 864
 865 static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf)
 866 {
 867         struct usb_interface *intf = to_usb_interface(dev);
 868         struct usblp *usblp = usb_get_intfdata (intf);
 869
 870         if (usblp->device_id_string[0] == 0 &&
 871             usblp->device_id_string[1] == 0)
 872                 return 0;
 873
 874         return sprintf(buf, "%s", usblp->device_id_string+2);
 875 }
 876
 877 static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL);
 878
 879 static int usblp_probe(struct usb_interface *intf,
 880                        const struct usb_device_id *id)
 881 {
 882         struct usb_device *dev = interface_to_usbdev (intf);
 883         struct usblp *usblp = NULL;
 884         int protocol;
 885         int retval;
 886
 887         /* Malloc and start initializing usblp structure so we can use it
 888          * directly. */
 889         if (!(usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL))) {
 890                 err("out of memory for usblp");
 891                 goto abort;
 892         }
 893         usblp->dev = dev;
 894         mutex_init (&usblp->mut);
 895         init_waitqueue_head(&usblp->wait);
 896         usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
 897         usblp->intf = intf;
 898
 899         usblp->writeurb = usb_alloc_urb(0, GFP_KERNEL);
 900         if (!usblp->writeurb) {
 901                 err("out of memory");
 902                 goto abort;
 903         }
 904         usblp->readurb = usb_alloc_urb(0, GFP_KERNEL);
 905         if (!usblp->readurb) {
 906                 err("out of memory");
 907                 goto abort;
 908         }
 909
 910         /* Malloc device ID string buffer to the largest expected length,
 911          * since we can re-query it on an ioctl and a dynamic string
 912          * could change in length. */
 913         if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
 914                 err("out of memory for device_id_string");
 915                 goto abort;
 916         }
 917
 918         usblp->writebuf = usblp->readbuf = NULL;
 919         usblp->writeurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 920         usblp->readurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 921         /* Malloc write & read buffers.  We somewhat wastefully
 922          * malloc both regardless of bidirectionality, because the
 923          * alternate setting can be changed later via an ioctl. */
 924         if (!(usblp->writebuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
 925                                 GFP_KERNEL, &usblp->writeurb->transfer_dma))) {
 926                 err("out of memory for write buf");
 927                 goto abort;
 928         }
 929         if (!(usblp->readbuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
 930                                 GFP_KERNEL, &usblp->readurb->transfer_dma))) {
 931                 err("out of memory for read buf");
 932                 goto abort;
 933         }
 934
 935         /* Allocate buffer for printer status */
 936         usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
 937         if (!usblp->statusbuf) {
 938                 err("out of memory for statusbuf");
 939                 goto abort;
 940         }
 941
 942         /* Lookup quirks for this printer. */
 943         usblp->quirks = usblp_quirks(
 944                 le16_to_cpu(dev->descriptor.idVendor),
 945                 le16_to_cpu(dev->descriptor.idProduct));
 946
 947         /* Analyze and pick initial alternate settings and endpoints. */
 948         protocol = usblp_select_alts(usblp);
 949         if (protocol < 0) {
 950                 dbg("incompatible printer-class device 0x%4.4X/0x%4.4X",
 951                         le16_to_cpu(dev->descriptor.idVendor),
 952                         le16_to_cpu(dev->descriptor.idProduct));
 953                 goto abort;
 954         }
 955
 956         /* Setup the selected alternate setting and endpoints. */
 957         if (usblp_set_protocol(usblp, protocol) < 0)
 958                 goto abort;
 959
 960         /* Retrieve and store the device ID string. */
 961         usblp_cache_device_id_string(usblp);
 962         retval = device_create_file(&intf->dev, &dev_attr_ieee1284_id);
 963         if (retval)
 964                 goto abort_intfdata;
 965
 966 #ifdef DEBUG
 967         usblp_check_status(usblp, 0);
 968 #endif
 969
 970         usb_set_intfdata (intf, usblp);
 971
 972         usblp->present = 1;
 973
 974         retval = usb_register_dev(intf, &usblp_class);
 975         if (retval) {
 976                 err("Not able to get a minor for this device.");
 977                 goto abort_intfdata;
 978         }
 979         usblp->minor = intf->minor;
 980         info("usblp%d: USB %sdirectional printer dev %d "
 981                 "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X",
 982                 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
 983                 usblp->ifnum,
 984                 usblp->protocol[usblp->current_protocol].alt_setting,
 985                 usblp->current_protocol,
 986                 le16_to_cpu(usblp->dev->descriptor.idVendor),
 987                 le16_to_cpu(usblp->dev->descriptor.idProduct));
 988
 989         return 0;
 990
 991 abort_intfdata:
 992         usb_set_intfdata (intf, NULL);
 993         device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
 994 abort:
 995         if (usblp) {
 996                 if (usblp->writebuf)
 997                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
 998                                 usblp->writebuf, usblp->writeurb->transfer_dma);
 999                 if (usblp->readbuf)
1000                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1001                                 usblp->readbuf, usblp->writeurb->transfer_dma);
1002                 kfree(usblp->statusbuf);
1003                 kfree(usblp->device_id_string);
1004                 usb_free_urb(usblp->writeurb);
1005                 usb_free_urb(usblp->readurb);
1006                 kfree(usblp);
1007         }
1008         return -EIO;
1009 }
1010
1011 /*
1012  * We are a "new" style driver with usb_device_id table,
1013  * but our requirements are too intricate for simple match to handle.
1014  *
1015  * The "proto_bias" option may be used to specify the preferred protocol
1016  * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3).  If the device
1017  * supports the preferred protocol, then we bind to it.
1018  *
1019  * The best interface for us is 7/1/2, because it is compatible
1020  * with a stream of characters. If we find it, we bind to it.
1021  *
1022  * Note that the people from hpoj.sourceforge.net need to be able to
1023  * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
1024  *
1025  * Failing 7/1/2, we look for 7/1/3, even though it's probably not
1026  * stream-compatible, because this matches the behaviour of the old code.
1027  *
1028  * If nothing else, we bind to 7/1/1 - the unidirectional interface.
1029  */
1030 static int usblp_select_alts(struct usblp *usblp)
1031 {
1032         struct usb_interface *if_alt;
1033         struct usb_host_interface *ifd;
1034         struct usb_endpoint_descriptor *epd, *epwrite, *epread;
1035         int p, i, e;
1036
1037         if_alt = usblp->intf;
1038
1039         for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1040                 usblp->protocol[p].alt_setting = -1;
1041
1042         /* Find out what we have. */
1043         for (i = 0; i < if_alt->num_altsetting; i++) {
1044                 ifd = &if_alt->altsetting[i];
1045
1046                 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
1047                         continue;
1048
1049                 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1050                     ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1051                         continue;
1052
1053                 /* Look for bulk OUT and IN endpoints. */
1054                 epwrite = epread = NULL;
1055                 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1056                         epd = &ifd->endpoint[e].desc;
1057
1058                         if (usb_endpoint_is_bulk_out(epd))
1059                                 if (!epwrite)
1060                                         epwrite = epd;
1061
1062                         if (usb_endpoint_is_bulk_in(epd))
1063                                 if (!epread)
1064                                         epread = epd;
1065                 }
1066
1067                 /* Ignore buggy hardware without the right endpoints. */
1068                 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1069                         continue;
1070
1071                 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1072                  * and buggy bidirectional printers. */
1073                 if (ifd->desc.bInterfaceProtocol == 1) {
1074                         epread = NULL;
1075                 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1076                         info("Disabling reads from problem bidirectional "
1077                                 "printer on usblp%d", usblp->minor);
1078                         epread = NULL;
1079                 }
1080
1081                 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1082                                 ifd->desc.bAlternateSetting;
1083                 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1084                 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1085         }
1086
1087         /* If our requested protocol is supported, then use it. */
1088         if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1089             proto_bias <= USBLP_LAST_PROTOCOL &&
1090             usblp->protocol[proto_bias].alt_setting != -1)
1091                 return proto_bias;
1092
1093         /* Ordering is important here. */
1094         if (usblp->protocol[2].alt_setting != -1)
1095                 return 2;
1096         if (usblp->protocol[1].alt_setting != -1)
1097                 return 1;
1098         if (usblp->protocol[3].alt_setting != -1)
1099                 return 3;
1100
1101         /* If nothing is available, then don't bind to this device. */
1102         return -1;
1103 }
1104
1105 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1106 {
1107         int r, alts;
1108
1109         if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1110                 return -EINVAL;
1111
1112         alts = usblp->protocol[protocol].alt_setting;
1113         if (alts < 0)
1114                 return -EINVAL;
1115         r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1116         if (r < 0) {
1117                 err("can't set desired altsetting %d on interface %d",
1118                         alts, usblp->ifnum);
1119                 return r;
1120         }
1121
1122         usb_fill_bulk_urb(usblp->writeurb, usblp->dev,
1123                 usb_sndbulkpipe(usblp->dev,
1124                   usblp->protocol[protocol].epwrite->bEndpointAddress),
1125                 usblp->writebuf, 0,
1126                 usblp_bulk_write, usblp);
1127
1128         usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1129         if (usblp->bidir)
1130                 usb_fill_bulk_urb(usblp->readurb, usblp->dev,
1131                         usb_rcvbulkpipe(usblp->dev,
1132                           usblp->protocol[protocol].epread->bEndpointAddress),
1133                         usblp->readbuf, USBLP_BUF_SIZE,
1134                         usblp_bulk_read, usblp);
1135
1136         usblp->current_protocol = protocol;
1137         dbg("usblp%d set protocol %d", usblp->minor, protocol);
1138         return 0;
1139 }
1140
1141 /* Retrieves and caches device ID string.
1142  * Returns length, including length bytes but not null terminator.
1143  * On error, returns a negative errno value. */
1144 static int usblp_cache_device_id_string(struct usblp *usblp)
1145 {
1146         int err, length;
1147
1148         err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1149         if (err < 0) {
1150                 dbg("usblp%d: error = %d reading IEEE-1284 Device ID string",
1151                         usblp->minor, err);
1152                 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1153                 return -EIO;
1154         }
1155
1156         /* First two bytes are length in big-endian.
1157          * They count themselves, and we copy them into
1158          * the user's buffer. */
1159         length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1160         if (length < 2)
1161                 length = 2;
1162         else if (length >= USBLP_DEVICE_ID_SIZE)
1163                 length = USBLP_DEVICE_ID_SIZE - 1;
1164         usblp->device_id_string[length] = '\0';
1165
1166         dbg("usblp%d Device ID string [len=%d]=\"%s\"",
1167                 usblp->minor, length, &usblp->device_id_string[2]);
1168
1169         return length;
1170 }
1171
1172 static void usblp_disconnect(struct usb_interface *intf)
1173 {
1174         struct usblp *usblp = usb_get_intfdata (intf);
1175
1176         usb_deregister_dev(intf, &usblp_class);
1177
1178         if (!usblp || !usblp->dev) {
1179                 err("bogus disconnect");
1180                 BUG ();
1181         }
1182
1183         device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1184
1185         mutex_lock (&usblp_mutex);
1186         mutex_lock (&usblp->mut);
1187         usblp->present = 0;
1188         usb_set_intfdata (intf, NULL);
1189
1190         usblp_unlink_urbs(usblp);
1191         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1192                         usblp->writebuf, usblp->writeurb->transfer_dma);
1193         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1194                         usblp->readbuf, usblp->readurb->transfer_dma);
1195         mutex_unlock (&usblp->mut);
1196
1197         if (!usblp->used)
1198                 usblp_cleanup (usblp);
1199         mutex_unlock (&usblp_mutex);
1200 }
1201
1202 static int usblp_suspend (struct usb_interface *intf, pm_message_t message)
1203 {
1204         struct usblp *usblp = usb_get_intfdata (intf);
1205
1206         /* this races against normal access and open */
1207         mutex_lock (&usblp_mutex);
1208         mutex_lock (&usblp->mut);
1209         /* we take no more IO */
1210         usblp->sleeping = 1;
1211         usblp_unlink_urbs(usblp);
1212         mutex_unlock (&usblp->mut);
1213         mutex_unlock (&usblp_mutex);
1214
1215         return 0;
1216 }
1217
1218 static int usblp_resume (struct usb_interface *intf)
1219 {
1220         struct usblp *usblp = usb_get_intfdata (intf);
1221         int r;
1222
1223         mutex_lock (&usblp_mutex);
1224         mutex_lock (&usblp->mut);
1225
1226         usblp->sleeping = 0;
1227         r = handle_bidir (usblp);
1228
1229         mutex_unlock (&usblp->mut);
1230         mutex_unlock (&usblp_mutex);
1231
1232         return r;
1233 }
1234
1235 static struct usb_device_id usblp_ids [] = {
1236         { USB_DEVICE_INFO(7, 1, 1) },
1237         { USB_DEVICE_INFO(7, 1, 2) },
1238         { USB_DEVICE_INFO(7, 1, 3) },
1239         { USB_INTERFACE_INFO(7, 1, 1) },
1240         { USB_INTERFACE_INFO(7, 1, 2) },
1241         { USB_INTERFACE_INFO(7, 1, 3) },
1242         { }                                             /* Terminating entry */
1243 };
1244
1245 MODULE_DEVICE_TABLE (usb, usblp_ids);
1246
1247 static struct usb_driver usblp_driver = {
1248         .name =         "usblp",
1249         .probe =        usblp_probe,
1250         .disconnect =   usblp_disconnect,
1251         .suspend =      usblp_suspend,
1252         .resume =       usblp_resume,
1253         .id_table =     usblp_ids,
1254 };
1255
1256 static int __init usblp_init(void)
1257 {
1258         int retval;
1259         retval = usb_register(&usblp_driver);
1260         if (!retval)
1261                 info(DRIVER_VERSION ": " DRIVER_DESC);
1262
1263         return retval;
1264 }
1265
1266 static void __exit usblp_exit(void)
1267 {
1268         usb_deregister(&usblp_driver);
1269 }
1270
1271 module_init(usblp_init);
1272 module_exit(usblp_exit);
1273
1274 MODULE_AUTHOR( DRIVER_AUTHOR );
1275 MODULE_DESCRIPTION( DRIVER_DESC );
1276 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1277 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1278 MODULE_LICENSE("GPL");