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/signal.h>
  53 #include <linux/poll.h>
  54 #include <linux/init.h>
  55 #include <linux/slab.h>
  56 #include <linux/lp.h>
  57 #include <linux/mutex.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 mutex            mut;                    /* 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           sleeping;               /* interface is suspended */
 157         unsigned char           *device_id_string;      /* IEEE 1284 DEVICE ID string (ptr) */
 158                                                         /* first 2 bytes are (big-endian) length */
 159 };
 160
 161 #ifdef DEBUG
 162 static void usblp_dump(struct usblp *usblp) {
 163         int p;
 164
 165         dbg("usblp=0x%p", usblp);
 166         dbg("dev=0x%p", usblp->dev);
 167         dbg("present=%d", usblp->present);
 168         dbg("readbuf=0x%p", usblp->readbuf);
 169         dbg("writebuf=0x%p", usblp->writebuf);
 170         dbg("readurb=0x%p", usblp->readurb);
 171         dbg("writeurb=0x%p", usblp->writeurb);
 172         dbg("readcount=%d", usblp->readcount);
 173         dbg("ifnum=%d", usblp->ifnum);
 174     for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
 175         dbg("protocol[%d].alt_setting=%d", p, usblp->protocol[p].alt_setting);
 176         dbg("protocol[%d].epwrite=%p", p, usblp->protocol[p].epwrite);
 177         dbg("protocol[%d].epread=%p", p, usblp->protocol[p].epread);
 178     }
 179         dbg("current_protocol=%d", usblp->current_protocol);
 180         dbg("minor=%d", usblp->minor);
 181         dbg("wcomplete=%d", usblp->wcomplete);
 182         dbg("rcomplete=%d", usblp->rcomplete);
 183         dbg("quirks=%d", usblp->quirks);
 184         dbg("used=%d", usblp->used);
 185         dbg("bidir=%d", usblp->bidir);
 186         dbg("sleeping=%d", usblp->sleeping);
 187         dbg("device_id_string=\"%s\"",
 188                 usblp->device_id_string ?
 189                         usblp->device_id_string + 2 :
 190                         (unsigned char *)"(null)");
 191 }
 192 #endif
 193
 194 /* Quirks: various printer quirks are handled by this table & its flags. */
 195
 196 struct quirk_printer_struct {
 197         __u16 vendorId;
 198         __u16 productId;
 199         unsigned int quirks;
 200 };
 201
 202 #define USBLP_QUIRK_BIDIR       0x1     /* reports bidir but requires unidirectional mode (no INs/reads) */
 203 #define USBLP_QUIRK_USB_INIT    0x2     /* needs vendor USB init string */
 204 #define USBLP_QUIRK_BAD_CLASS   0x4     /* descriptor uses vendor-specific Class or SubClass */
 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         { 0x04b8, 0x0202, USBLP_QUIRK_BAD_CLASS }, /* Seiko Epson Receipt Printer M129C */
 222         { 0, 0 }
 223 };
 224
 225 static int usblp_select_alts(struct usblp *usblp);
 226 static int usblp_set_protocol(struct usblp *usblp, int protocol);
 227 static int usblp_cache_device_id_string(struct usblp *usblp);
 228
 229 /* forward reference to make our lives easier */
 230 static struct usb_driver usblp_driver;
 231 static DEFINE_MUTEX(usblp_mutex);       /* locks the existence of usblp's */
 232
 233 /*
 234  * Functions for usblp control messages.
 235  */
 236
 237 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
 238 {
 239         int retval;
 240         int index = usblp->ifnum;
 241
 242         /* High byte has the interface index.
 243            Low byte has the alternate setting.
 244          */
 245         if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) {
 246           index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
 247         }
 248
 249         retval = usb_control_msg(usblp->dev,
 250                 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
 251                 request, type | dir | recip, value, index, buf, len, USBLP_WRITE_TIMEOUT);
 252         dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d",
 253                 request, !!dir, recip, value, index, len, retval);
 254         return retval < 0 ? retval : 0;
 255 }
 256
 257 #define usblp_read_status(usblp, status)\
 258         usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
 259 #define usblp_get_id(usblp, config, id, maxlen)\
 260         usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
 261 #define usblp_reset(usblp)\
 262         usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
 263
 264 #define usblp_hp_channel_change_request(usblp, channel, buffer) \
 265         usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
 266
 267 /*
 268  * See the description for usblp_select_alts() below for the usage
 269  * explanation.  Look into your /proc/bus/usb/devices and dmesg in
 270  * case of any trouble.
 271  */
 272 static int proto_bias = -1;
 273
 274 /*
 275  * URB callback.
 276  */
 277
 278 static void usblp_bulk_read(struct urb *urb)
 279 {
 280         struct usblp *usblp = urb->context;
 281
 282         if (unlikely(!usblp || !usblp->dev || !usblp->used))
 283                 return;
 284
 285         if (unlikely(!usblp->present))
 286                 goto unplug;
 287         if (unlikely(urb->status))
 288                 warn("usblp%d: nonzero read/write bulk status received: %d",
 289                         usblp->minor, urb->status);
 290         usblp->rcomplete = 1;
 291 unplug:
 292         wake_up_interruptible(&usblp->wait);
 293 }
 294
 295 static void usblp_bulk_write(struct urb *urb)
 296 {
 297         struct usblp *usblp = urb->context;
 298
 299         if (unlikely(!usblp || !usblp->dev || !usblp->used))
 300                 return;
 301         if (unlikely(!usblp->present))
 302                 goto unplug;
 303         if (unlikely(urb->status))
 304                 warn("usblp%d: nonzero read/write bulk status received: %d",
 305                         usblp->minor, urb->status);
 306         usblp->wcomplete = 1;
 307 unplug:
 308         wake_up_interruptible(&usblp->wait);
 309 }
 310
 311 /*
 312  * Get and print printer errors.
 313  */
 314
 315 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
 316
 317 static int usblp_check_status(struct usblp *usblp, int err)
 318 {
 319         unsigned char status, newerr = 0;
 320         int error;
 321
 322         error = usblp_read_status (usblp, usblp->statusbuf);
 323         if (error < 0) {
 324                 if (printk_ratelimit())
 325                         err("usblp%d: error %d reading printer status",
 326                                 usblp->minor, error);
 327                 return 0;
 328         }
 329
 330         status = *usblp->statusbuf;
 331
 332         if (~status & LP_PERRORP)
 333                 newerr = 3;
 334         if (status & LP_POUTPA)
 335                 newerr = 1;
 336         if (~status & LP_PSELECD)
 337                 newerr = 2;
 338
 339         if (newerr != err)
 340                 info("usblp%d: %s", usblp->minor, usblp_messages[newerr]);
 341
 342         return newerr;
 343 }
 344
 345 static int handle_bidir (struct usblp *usblp)
 346 {
 347         if (usblp->bidir && usblp->used && !usblp->sleeping) {
 348                 usblp->readcount = 0;
 349                 usblp->readurb->dev = usblp->dev;
 350                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) {
 351                         usblp->used = 0;
 352                         return -EIO;
 353                 }
 354         }
 355
 356         return 0;
 357 }
 358
 359 /*
 360  * File op functions.
 361  */
 362
 363 static int usblp_open(struct inode *inode, struct file *file)
 364 {
 365         int minor = iminor(inode);
 366         struct usblp *usblp;
 367         struct usb_interface *intf;
 368         int retval;
 369
 370         if (minor < 0)
 371                 return -ENODEV;
 372
 373         mutex_lock (&usblp_mutex);
 374
 375         retval = -ENODEV;
 376         intf = usb_find_interface(&usblp_driver, minor);
 377         if (!intf) {
 378                 goto out;
 379         }
 380         usblp = usb_get_intfdata (intf);
 381         if (!usblp || !usblp->dev || !usblp->present)
 382                 goto out;
 383
 384         retval = -EBUSY;
 385         if (usblp->used)
 386                 goto out;
 387
 388         /*
 389          * TODO: need to implement LP_ABORTOPEN + O_NONBLOCK as in drivers/char/lp.c ???
 390          * This is #if 0-ed because we *don't* want to fail an open
 391          * just because the printer is off-line.
 392          */
 393 #if 0
 394         if ((retval = usblp_check_status(usblp, 0))) {
 395                 retval = retval > 1 ? -EIO : -ENOSPC;
 396                 goto out;
 397         }
 398 #else
 399         retval = 0;
 400 #endif
 401
 402         retval = usb_autopm_get_interface(intf);
 403         if (retval < 0)
 404                 goto out;
 405         usblp->used = 1;
 406         file->private_data = usblp;
 407
 408         usblp->writeurb->transfer_buffer_length = 0;
 409         usblp->wcomplete = 1; /* we begin writeable */
 410         usblp->rcomplete = 0;
 411         usblp->writeurb->status = 0;
 412         usblp->readurb->status = 0;
 413
 414         if (handle_bidir(usblp) < 0) {
 415                 file->private_data = NULL;
 416                 retval = -EIO;
 417         }
 418 out:
 419         mutex_unlock (&usblp_mutex);
 420         return retval;
 421 }
 422
 423 static void usblp_cleanup (struct usblp *usblp)
 424 {
 425         info("usblp%d: removed", usblp->minor);
 426
 427         kfree (usblp->device_id_string);
 428         kfree (usblp->statusbuf);
 429         usb_free_urb(usblp->writeurb);
 430         usb_free_urb(usblp->readurb);
 431         kfree (usblp);
 432 }
 433
 434 static void usblp_unlink_urbs(struct usblp *usblp)
 435 {
 436         usb_kill_urb(usblp->writeurb);
 437         if (usblp->bidir)
 438                 usb_kill_urb(usblp->readurb);
 439 }
 440
 441 static int usblp_release(struct inode *inode, struct file *file)
 442 {
 443         struct usblp *usblp = file->private_data;
 444
 445         mutex_lock (&usblp_mutex);
 446         usblp->used = 0;
 447         if (usblp->present) {
 448                 usblp_unlink_urbs(usblp);
 449                 usb_autopm_put_interface(usblp->intf);
 450         } else          /* finish cleanup from disconnect */
 451                 usblp_cleanup (usblp);
 452         mutex_unlock (&usblp_mutex);
 453         return 0;
 454 }
 455
 456 /* No kernel lock - fine */
 457 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
 458 {
 459         struct usblp *usblp = file->private_data;
 460         poll_wait(file, &usblp->wait, wait);
 461         return ((!usblp->bidir || !usblp->rcomplete) ? 0 : POLLIN  | POLLRDNORM)
 462                                | (!usblp->wcomplete ? 0 : POLLOUT | POLLWRNORM);
 463 }
 464
 465 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 466 {
 467         struct usblp *usblp = file->private_data;
 468         int length, err, i;
 469         unsigned char newChannel;
 470         int status;
 471         int twoints[2];
 472         int retval = 0;
 473
 474         mutex_lock (&usblp->mut);
 475         if (!usblp->present) {
 476                 retval = -ENODEV;
 477                 goto done;
 478         }
 479
 480         if (usblp->sleeping) {
 481                 retval = -ENODEV;
 482                 goto done;
 483         }
 484
 485         dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd),
 486                 _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd) );
 487
 488         if (_IOC_TYPE(cmd) == 'P')      /* new-style ioctl number */
 489
 490                 switch (_IOC_NR(cmd)) {
 491
 492                         case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
 493                                 if (_IOC_DIR(cmd) != _IOC_READ) {
 494                                         retval = -EINVAL;
 495                                         goto done;
 496                                 }
 497
 498                                 length = usblp_cache_device_id_string(usblp);
 499                                 if (length < 0) {
 500                                         retval = length;
 501                                         goto done;
 502                                 }
 503                                 if (length > _IOC_SIZE(cmd))
 504                                         length = _IOC_SIZE(cmd); /* truncate */
 505
 506                                 if (copy_to_user((void __user *) arg,
 507                                                 usblp->device_id_string,
 508                                                 (unsigned long) length)) {
 509                                         retval = -EFAULT;
 510                                         goto done;
 511                                 }
 512
 513                                 break;
 514
 515                         case IOCNR_GET_PROTOCOLS:
 516                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 517                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 518                                         retval = -EINVAL;
 519                                         goto done;
 520                                 }
 521
 522                                 twoints[0] = usblp->current_protocol;
 523                                 twoints[1] = 0;
 524                                 for (i = USBLP_FIRST_PROTOCOL;
 525                                      i <= USBLP_LAST_PROTOCOL; i++) {
 526                                         if (usblp->protocol[i].alt_setting >= 0)
 527                                                 twoints[1] |= (1<<i);
 528                                 }
 529
 530                                 if (copy_to_user((void __user *)arg,
 531                                                 (unsigned char *)twoints,
 532                                                 sizeof(twoints))) {
 533                                         retval = -EFAULT;
 534                                         goto done;
 535                                 }
 536
 537                                 break;
 538
 539                         case IOCNR_SET_PROTOCOL:
 540                                 if (_IOC_DIR(cmd) != _IOC_WRITE) {
 541                                         retval = -EINVAL;
 542                                         goto done;
 543                                 }
 544
 545 #ifdef DEBUG
 546                                 if (arg == -10) {
 547                                         usblp_dump(usblp);
 548                                         break;
 549                                 }
 550 #endif
 551
 552                                 usblp_unlink_urbs(usblp);
 553                                 retval = usblp_set_protocol(usblp, arg);
 554                                 if (retval < 0) {
 555                                         usblp_set_protocol(usblp,
 556                                                 usblp->current_protocol);
 557                                 }
 558                                 break;
 559
 560                         case IOCNR_HP_SET_CHANNEL:
 561                                 if (_IOC_DIR(cmd) != _IOC_WRITE ||
 562                                     le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
 563                                     usblp->quirks & USBLP_QUIRK_BIDIR) {
 564                                         retval = -EINVAL;
 565                                         goto done;
 566                                 }
 567
 568                                 err = usblp_hp_channel_change_request(usblp,
 569                                         arg, &newChannel);
 570                                 if (err < 0) {
 571                                         err("usblp%d: error = %d setting "
 572                                                 "HP channel",
 573                                                 usblp->minor, err);
 574                                         retval = -EIO;
 575                                         goto done;
 576                                 }
 577
 578                                 dbg("usblp%d requested/got HP channel %ld/%d",
 579                                         usblp->minor, arg, newChannel);
 580                                 break;
 581
 582                         case IOCNR_GET_BUS_ADDRESS:
 583                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 584                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 585                                         retval = -EINVAL;
 586                                         goto done;
 587                                 }
 588
 589                                 twoints[0] = usblp->dev->bus->busnum;
 590                                 twoints[1] = usblp->dev->devnum;
 591                                 if (copy_to_user((void __user *)arg,
 592                                                 (unsigned char *)twoints,
 593                                                 sizeof(twoints))) {
 594                                         retval = -EFAULT;
 595                                         goto done;
 596                                 }
 597
 598                                 dbg("usblp%d is bus=%d, device=%d",
 599                                         usblp->minor, twoints[0], twoints[1]);
 600                                 break;
 601
 602                         case IOCNR_GET_VID_PID:
 603                                 if (_IOC_DIR(cmd) != _IOC_READ ||
 604                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
 605                                         retval = -EINVAL;
 606                                         goto done;
 607                                 }
 608
 609                                 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
 610                                 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
 611                                 if (copy_to_user((void __user *)arg,
 612                                                 (unsigned char *)twoints,
 613                                                 sizeof(twoints))) {
 614                                         retval = -EFAULT;
 615                                         goto done;
 616                                 }
 617
 618                                 dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X",
 619                                         usblp->minor, twoints[0], twoints[1]);
 620                                 break;
 621
 622                         case IOCNR_SOFT_RESET:
 623                                 if (_IOC_DIR(cmd) != _IOC_NONE) {
 624                                         retval = -EINVAL;
 625                                         goto done;
 626                                 }
 627                                 retval = usblp_reset(usblp);
 628                                 break;
 629                         default:
 630                                 retval = -ENOTTY;
 631                 }
 632         else    /* old-style ioctl value */
 633                 switch (cmd) {
 634
 635                         case LPGETSTATUS:
 636                                 if (usblp_read_status(usblp, usblp->statusbuf)) {
 637                                         if (printk_ratelimit())
 638                                                 err("usblp%d: failed reading printer status",
 639                                                         usblp->minor);
 640                                         retval = -EIO;
 641                                         goto done;
 642                                 }
 643                                 status = *usblp->statusbuf;
 644                                 if (copy_to_user ((void __user *)arg, &status, sizeof(int)))
 645                                         retval = -EFAULT;
 646                                 break;
 647
 648                         default:
 649                                 retval = -ENOTTY;
 650                 }
 651
 652 done:
 653         mutex_unlock (&usblp->mut);
 654         return retval;
 655 }
 656
 657 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 658 {
 659         struct usblp *usblp = file->private_data;
 660         int timeout, intr, rv, err = 0, transfer_length = 0;
 661         size_t writecount = 0;
 662
 663         while (writecount < count) {
 664                 if (!usblp->wcomplete) {
 665                         barrier();
 666                         if (file->f_flags & O_NONBLOCK) {
 667                                 writecount += transfer_length;
 668                                 return writecount ? writecount : -EAGAIN;
 669                         }
 670
 671                         timeout = USBLP_WRITE_TIMEOUT;
 672
 673                         rv = wait_event_interruptible_timeout(usblp->wait, usblp->wcomplete || !usblp->present , timeout);
 674                         if (rv < 0)
 675                                 return writecount ? writecount : -EINTR;
 676                 }
 677                 intr = mutex_lock_interruptible (&usblp->mut);
 678                 if (intr)
 679                         return writecount ? writecount : -EINTR;
 680                 if (!usblp->present) {
 681                         mutex_unlock (&usblp->mut);
 682                         return -ENODEV;
 683                 }
 684
 685                 if (usblp->sleeping) {
 686                         mutex_unlock (&usblp->mut);
 687                         return writecount ? writecount : -ENODEV;
 688                 }
 689
 690                 if (usblp->writeurb->status != 0) {
 691                         if (usblp->quirks & USBLP_QUIRK_BIDIR) {
 692                                 if (!usblp->wcomplete)
 693                                         err("usblp%d: error %d writing to printer",
 694                                                 usblp->minor, usblp->writeurb->status);
 695                                 err = usblp->writeurb->status;
 696                         } else
 697                                 err = usblp_check_status(usblp, err);
 698                         mutex_unlock (&usblp->mut);
 699
 700                         /* if the fault was due to disconnect, let khubd's
 701                          * call to usblp_disconnect() grab usblp->mut ...
 702                          */
 703                         schedule ();
 704                         continue;
 705                 }
 706
 707                 /* We must increment writecount here, and not at the
 708                  * end of the loop. Otherwise, the final loop iteration may
 709                  * be skipped, leading to incomplete printer output.
 710                  */
 711                 writecount += transfer_length;
 712                 if (writecount == count) {
 713                         mutex_unlock(&usblp->mut);
 714                         break;
 715                 }
 716
 717                 transfer_length=(count - writecount);
 718                 if (transfer_length > USBLP_BUF_SIZE)
 719                         transfer_length = USBLP_BUF_SIZE;
 720
 721                 usblp->writeurb->transfer_buffer_length = transfer_length;
 722
 723                 if (copy_from_user(usblp->writeurb->transfer_buffer,
 724                                    buffer + writecount, transfer_length)) {
 725                         mutex_unlock(&usblp->mut);
 726                         return writecount ? writecount : -EFAULT;
 727                 }
 728
 729                 usblp->writeurb->dev = usblp->dev;
 730                 usblp->wcomplete = 0;
 731                 err = usb_submit_urb(usblp->writeurb, GFP_KERNEL);
 732                 if (err) {
 733                         usblp->wcomplete = 1;
 734                         if (err != -ENOMEM)
 735                                 count = -EIO;
 736                         else
 737                                 count = writecount ? writecount : -ENOMEM;
 738                         mutex_unlock (&usblp->mut);
 739                         break;
 740                 }
 741                 mutex_unlock (&usblp->mut);
 742         }
 743
 744         return count;
 745 }
 746
 747 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 748 {
 749         struct usblp *usblp = file->private_data;
 750         int rv, intr;
 751
 752         if (!usblp->bidir)
 753                 return -EINVAL;
 754
 755         intr = mutex_lock_interruptible (&usblp->mut);
 756         if (intr)
 757                 return -EINTR;
 758         if (!usblp->present) {
 759                 count = -ENODEV;
 760                 goto done;
 761         }
 762
 763         if (!usblp->rcomplete) {
 764                 barrier();
 765
 766                 if (file->f_flags & O_NONBLOCK) {
 767                         count = -EAGAIN;
 768                         goto done;
 769                 }
 770                 mutex_unlock(&usblp->mut);
 771                 rv = wait_event_interruptible(usblp->wait, usblp->rcomplete || !usblp->present);
 772                 mutex_lock(&usblp->mut);
 773                 if (rv < 0) {
 774                         count = -EINTR;
 775                         goto done;
 776                 }
 777         }
 778
 779         if (!usblp->present) {
 780                 count = -ENODEV;
 781                 goto done;
 782         }
 783
 784         if (usblp->sleeping) {
 785                 count = -ENODEV;
 786                 goto done;
 787         }
 788
 789         if (usblp->readurb->status) {
 790                 err("usblp%d: error %d reading from printer",
 791                         usblp->minor, usblp->readurb->status);
 792                 usblp->readurb->dev = usblp->dev;
 793                 usblp->readcount = 0;
 794                 usblp->rcomplete = 0;
 795                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0)
 796                         dbg("error submitting urb");
 797                 count = -EIO;
 798                 goto done;
 799         }
 800
 801         count = count < usblp->readurb->actual_length - usblp->readcount ?
 802                 count : usblp->readurb->actual_length - usblp->readcount;
 803
 804         if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) {
 805                 count = -EFAULT;
 806                 goto done;
 807         }
 808
 809         if ((usblp->readcount += count) == usblp->readurb->actual_length) {
 810                 usblp->readcount = 0;
 811                 usblp->readurb->dev = usblp->dev;
 812                 usblp->rcomplete = 0;
 813                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL)) {
 814                         count = -EIO;
 815                         goto done;
 816                 }
 817         }
 818
 819 done:
 820         mutex_unlock (&usblp->mut);
 821         return count;
 822 }
 823
 824 /*
 825  * Checks for printers that have quirks, such as requiring unidirectional
 826  * communication but reporting bidirectional; currently some HP printers
 827  * have this flaw (HP 810, 880, 895, etc.), or needing an init string
 828  * sent at each open (like some Epsons).
 829  * Returns 1 if found, 0 if not found.
 830  *
 831  * HP recommended that we use the bidirectional interface but
 832  * don't attempt any bulk IN transfers from the IN endpoint.
 833  * Here's some more detail on the problem:
 834  * The problem is not that it isn't bidirectional though. The problem
 835  * is that if you request a device ID, or status information, while
 836  * the buffers are full, the return data will end up in the print data
 837  * buffer. For example if you make sure you never request the device ID
 838  * while you are sending print data, and you don't try to query the
 839  * printer status every couple of milliseconds, you will probably be OK.
 840  */
 841 static unsigned int usblp_quirks (__u16 vendor, __u16 product)
 842 {
 843         int i;
 844
 845         for (i = 0; quirk_printers[i].vendorId; i++) {
 846                 if (vendor == quirk_printers[i].vendorId &&
 847                     product == quirk_printers[i].productId)
 848                         return quirk_printers[i].quirks;
 849         }
 850         return 0;
 851 }
 852
 853 static const struct file_operations usblp_fops = {
 854         .owner =        THIS_MODULE,
 855         .read =         usblp_read,
 856         .write =        usblp_write,
 857         .poll =         usblp_poll,
 858         .unlocked_ioctl =       usblp_ioctl,
 859         .compat_ioctl =         usblp_ioctl,
 860         .open =         usblp_open,
 861         .release =      usblp_release,
 862 };
 863
 864 static struct usb_class_driver usblp_class = {
 865         .name =         "lp%d",
 866         .fops =         &usblp_fops,
 867         .minor_base =   USBLP_MINOR_BASE,
 868 };
 869
 870 static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf)
 871 {
 872         struct usb_interface *intf = to_usb_interface(dev);
 873         struct usblp *usblp = usb_get_intfdata (intf);
 874
 875         if (usblp->device_id_string[0] == 0 &&
 876             usblp->device_id_string[1] == 0)
 877                 return 0;
 878
 879         return sprintf(buf, "%s", usblp->device_id_string+2);
 880 }
 881
 882 static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL);
 883
 884 static int usblp_probe(struct usb_interface *intf,
 885                        const struct usb_device_id *id)
 886 {
 887         struct usb_device *dev = interface_to_usbdev (intf);
 888         struct usblp *usblp = NULL;
 889         int protocol;
 890         int retval;
 891
 892         /* Malloc and start initializing usblp structure so we can use it
 893          * directly. */
 894         if (!(usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL))) {
 895                 err("out of memory for usblp");
 896                 goto abort;
 897         }
 898         usblp->dev = dev;
 899         mutex_init (&usblp->mut);
 900         init_waitqueue_head(&usblp->wait);
 901         usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
 902         usblp->intf = intf;
 903
 904         usblp->writeurb = usb_alloc_urb(0, GFP_KERNEL);
 905         if (!usblp->writeurb) {
 906                 err("out of memory");
 907                 goto abort;
 908         }
 909         usblp->readurb = usb_alloc_urb(0, GFP_KERNEL);
 910         if (!usblp->readurb) {
 911                 err("out of memory");
 912                 goto abort;
 913         }
 914
 915         /* Malloc device ID string buffer to the largest expected length,
 916          * since we can re-query it on an ioctl and a dynamic string
 917          * could change in length. */
 918         if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
 919                 err("out of memory for device_id_string");
 920                 goto abort;
 921         }
 922
 923         usblp->writebuf = usblp->readbuf = NULL;
 924         usblp->writeurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 925         usblp->readurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 926         /* Malloc write & read buffers.  We somewhat wastefully
 927          * malloc both regardless of bidirectionality, because the
 928          * alternate setting can be changed later via an ioctl. */
 929         if (!(usblp->writebuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
 930                                 GFP_KERNEL, &usblp->writeurb->transfer_dma))) {
 931                 err("out of memory for write buf");
 932                 goto abort;
 933         }
 934         if (!(usblp->readbuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
 935                                 GFP_KERNEL, &usblp->readurb->transfer_dma))) {
 936                 err("out of memory for read buf");
 937                 goto abort;
 938         }
 939
 940         /* Allocate buffer for printer status */
 941         usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
 942         if (!usblp->statusbuf) {
 943                 err("out of memory for statusbuf");
 944                 goto abort;
 945         }
 946
 947         /* Lookup quirks for this printer. */
 948         usblp->quirks = usblp_quirks(
 949                 le16_to_cpu(dev->descriptor.idVendor),
 950                 le16_to_cpu(dev->descriptor.idProduct));
 951
 952         /* Analyze and pick initial alternate settings and endpoints. */
 953         protocol = usblp_select_alts(usblp);
 954         if (protocol < 0) {
 955                 dbg("incompatible printer-class device 0x%4.4X/0x%4.4X",
 956                         le16_to_cpu(dev->descriptor.idVendor),
 957                         le16_to_cpu(dev->descriptor.idProduct));
 958                 goto abort;
 959         }
 960
 961         /* Setup the selected alternate setting and endpoints. */
 962         if (usblp_set_protocol(usblp, protocol) < 0)
 963                 goto abort;
 964
 965         /* Retrieve and store the device ID string. */
 966         usblp_cache_device_id_string(usblp);
 967         retval = device_create_file(&intf->dev, &dev_attr_ieee1284_id);
 968         if (retval)
 969                 goto abort_intfdata;
 970
 971 #ifdef DEBUG
 972         usblp_check_status(usblp, 0);
 973 #endif
 974
 975         usb_set_intfdata (intf, usblp);
 976
 977         usblp->present = 1;
 978
 979         retval = usb_register_dev(intf, &usblp_class);
 980         if (retval) {
 981                 err("Not able to get a minor for this device.");
 982                 goto abort_intfdata;
 983         }
 984         usblp->minor = intf->minor;
 985         info("usblp%d: USB %sdirectional printer dev %d "
 986                 "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X",
 987                 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
 988                 usblp->ifnum,
 989                 usblp->protocol[usblp->current_protocol].alt_setting,
 990                 usblp->current_protocol,
 991                 le16_to_cpu(usblp->dev->descriptor.idVendor),
 992                 le16_to_cpu(usblp->dev->descriptor.idProduct));
 993
 994         return 0;
 995
 996 abort_intfdata:
 997         usb_set_intfdata (intf, NULL);
 998         device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
 999 abort:
1000         if (usblp) {
1001                 if (usblp->writebuf)
1002                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1003                                 usblp->writebuf, usblp->writeurb->transfer_dma);
1004                 if (usblp->readbuf)
1005                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1006                                 usblp->readbuf, usblp->writeurb->transfer_dma);
1007                 kfree(usblp->statusbuf);
1008                 kfree(usblp->device_id_string);
1009                 usb_free_urb(usblp->writeurb);
1010                 usb_free_urb(usblp->readurb);
1011                 kfree(usblp);
1012         }
1013         return -EIO;
1014 }
1015
1016 /*
1017  * We are a "new" style driver with usb_device_id table,
1018  * but our requirements are too intricate for simple match to handle.
1019  *
1020  * The "proto_bias" option may be used to specify the preferred protocol
1021  * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3).  If the device
1022  * supports the preferred protocol, then we bind to it.
1023  *
1024  * The best interface for us is 7/1/2, because it is compatible
1025  * with a stream of characters. If we find it, we bind to it.
1026  *
1027  * Note that the people from hpoj.sourceforge.net need to be able to
1028  * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
1029  *
1030  * Failing 7/1/2, we look for 7/1/3, even though it's probably not
1031  * stream-compatible, because this matches the behaviour of the old code.
1032  *
1033  * If nothing else, we bind to 7/1/1 - the unidirectional interface.
1034  */
1035 static int usblp_select_alts(struct usblp *usblp)
1036 {
1037         struct usb_interface *if_alt;
1038         struct usb_host_interface *ifd;
1039         struct usb_endpoint_descriptor *epd, *epwrite, *epread;
1040         int p, i, e;
1041
1042         if_alt = usblp->intf;
1043
1044         for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1045                 usblp->protocol[p].alt_setting = -1;
1046
1047         /* Find out what we have. */
1048         for (i = 0; i < if_alt->num_altsetting; i++) {
1049                 ifd = &if_alt->altsetting[i];
1050
1051                 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
1052                         if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS))
1053                                 continue;
1054
1055                 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1056                     ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1057                         continue;
1058
1059                 /* Look for bulk OUT and IN endpoints. */
1060                 epwrite = epread = NULL;
1061                 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1062                         epd = &ifd->endpoint[e].desc;
1063
1064                         if (usb_endpoint_is_bulk_out(epd))
1065                                 if (!epwrite)
1066                                         epwrite = epd;
1067
1068                         if (usb_endpoint_is_bulk_in(epd))
1069                                 if (!epread)
1070                                         epread = epd;
1071                 }
1072
1073                 /* Ignore buggy hardware without the right endpoints. */
1074                 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1075                         continue;
1076
1077                 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1078                  * and buggy bidirectional printers. */
1079                 if (ifd->desc.bInterfaceProtocol == 1) {
1080                         epread = NULL;
1081                 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1082                         info("Disabling reads from problem bidirectional "
1083                                 "printer on usblp%d", usblp->minor);
1084                         epread = NULL;
1085                 }
1086
1087                 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1088                                 ifd->desc.bAlternateSetting;
1089                 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1090                 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1091         }
1092
1093         /* If our requested protocol is supported, then use it. */
1094         if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1095             proto_bias <= USBLP_LAST_PROTOCOL &&
1096             usblp->protocol[proto_bias].alt_setting != -1)
1097                 return proto_bias;
1098
1099         /* Ordering is important here. */
1100         if (usblp->protocol[2].alt_setting != -1)
1101                 return 2;
1102         if (usblp->protocol[1].alt_setting != -1)
1103                 return 1;
1104         if (usblp->protocol[3].alt_setting != -1)
1105                 return 3;
1106
1107         /* If nothing is available, then don't bind to this device. */
1108         return -1;
1109 }
1110
1111 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1112 {
1113         int r, alts;
1114
1115         if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1116                 return -EINVAL;
1117
1118         alts = usblp->protocol[protocol].alt_setting;
1119         if (alts < 0)
1120                 return -EINVAL;
1121         r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1122         if (r < 0) {
1123                 err("can't set desired altsetting %d on interface %d",
1124                         alts, usblp->ifnum);
1125                 return r;
1126         }
1127
1128         usb_fill_bulk_urb(usblp->writeurb, usblp->dev,
1129                 usb_sndbulkpipe(usblp->dev,
1130                   usblp->protocol[protocol].epwrite->bEndpointAddress),
1131                 usblp->writebuf, 0,
1132                 usblp_bulk_write, usblp);
1133
1134         usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1135         if (usblp->bidir)
1136                 usb_fill_bulk_urb(usblp->readurb, usblp->dev,
1137                         usb_rcvbulkpipe(usblp->dev,
1138                           usblp->protocol[protocol].epread->bEndpointAddress),
1139                         usblp->readbuf, USBLP_BUF_SIZE,
1140                         usblp_bulk_read, usblp);
1141
1142         usblp->current_protocol = protocol;
1143         dbg("usblp%d set protocol %d", usblp->minor, protocol);
1144         return 0;
1145 }
1146
1147 /* Retrieves and caches device ID string.
1148  * Returns length, including length bytes but not null terminator.
1149  * On error, returns a negative errno value. */
1150 static int usblp_cache_device_id_string(struct usblp *usblp)
1151 {
1152         int err, length;
1153
1154         err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1155         if (err < 0) {
1156                 dbg("usblp%d: error = %d reading IEEE-1284 Device ID string",
1157                         usblp->minor, err);
1158                 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1159                 return -EIO;
1160         }
1161
1162         /* First two bytes are length in big-endian.
1163          * They count themselves, and we copy them into
1164          * the user's buffer. */
1165         length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1166         if (length < 2)
1167                 length = 2;
1168         else if (length >= USBLP_DEVICE_ID_SIZE)
1169                 length = USBLP_DEVICE_ID_SIZE - 1;
1170         usblp->device_id_string[length] = '\0';
1171
1172         dbg("usblp%d Device ID string [len=%d]=\"%s\"",
1173                 usblp->minor, length, &usblp->device_id_string[2]);
1174
1175         return length;
1176 }
1177
1178 static void usblp_disconnect(struct usb_interface *intf)
1179 {
1180         struct usblp *usblp = usb_get_intfdata (intf);
1181
1182         usb_deregister_dev(intf, &usblp_class);
1183
1184         if (!usblp || !usblp->dev) {
1185                 err("bogus disconnect");
1186                 BUG ();
1187         }
1188
1189         device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1190
1191         mutex_lock (&usblp_mutex);
1192         mutex_lock (&usblp->mut);
1193         usblp->present = 0;
1194         usb_set_intfdata (intf, NULL);
1195
1196         usblp_unlink_urbs(usblp);
1197         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1198                         usblp->writebuf, usblp->writeurb->transfer_dma);
1199         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1200                         usblp->readbuf, usblp->readurb->transfer_dma);
1201         mutex_unlock (&usblp->mut);
1202
1203         if (!usblp->used)
1204                 usblp_cleanup (usblp);
1205         mutex_unlock (&usblp_mutex);
1206 }
1207
1208 static int usblp_suspend (struct usb_interface *intf, pm_message_t message)
1209 {
1210         struct usblp *usblp = usb_get_intfdata (intf);
1211
1212         /* we take no more IO */
1213         usblp->sleeping = 1;
1214         usblp_unlink_urbs(usblp);
1215
1216         return 0;
1217 }
1218
1219 static int usblp_resume (struct usb_interface *intf)
1220 {
1221         struct usblp *usblp = usb_get_intfdata (intf);
1222         int r;
1223
1224         usblp->sleeping = 0;
1225         r = handle_bidir (usblp);
1226
1227         return r;
1228 }
1229
1230 static struct usb_device_id usblp_ids [] = {
1231         { USB_DEVICE_INFO(7, 1, 1) },
1232         { USB_DEVICE_INFO(7, 1, 2) },
1233         { USB_DEVICE_INFO(7, 1, 3) },
1234         { USB_INTERFACE_INFO(7, 1, 1) },
1235         { USB_INTERFACE_INFO(7, 1, 2) },
1236         { USB_INTERFACE_INFO(7, 1, 3) },
1237         { USB_DEVICE(0x04b8, 0x0202) }, /* Seiko Epson Receipt Printer M129C */
1238         { }                                             /* Terminating entry */
1239 };
1240
1241 MODULE_DEVICE_TABLE (usb, usblp_ids);
1242
1243 static struct usb_driver usblp_driver = {
1244         .name =         "usblp",
1245         .probe =        usblp_probe,
1246         .disconnect =   usblp_disconnect,
1247         .suspend =      usblp_suspend,
1248         .resume =       usblp_resume,
1249         .id_table =     usblp_ids,
1250         .supports_autosuspend = 1,
1251 };
1252
1253 static int __init usblp_init(void)
1254 {
1255         int retval;
1256         retval = usb_register(&usblp_driver);
1257         if (!retval)
1258                 info(DRIVER_VERSION ": " DRIVER_DESC);
1259
1260         return retval;
1261 }
1262
1263 static void __exit usblp_exit(void)
1264 {
1265         usb_deregister(&usblp_driver);
1266 }
1267
1268 module_init(usblp_init);
1269 module_exit(usblp_exit);
1270
1271 MODULE_AUTHOR( DRIVER_AUTHOR );
1272 MODULE_DESCRIPTION( DRIVER_DESC );
1273 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1274 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1275 MODULE_LICENSE("GPL");