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