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 #define USBLP_QUIRK_BAD_CLASS 0x4 /* descriptor uses vendor-specific Class or SubClass */ 206 207 static const struct quirk_printer_struct quirk_printers[] = { 208 { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */ 209 { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */ 210 { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */ 211 { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */ 212 { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */ 213 { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */ 214 { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */ 215 { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */ 216 { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */ 217 { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */ 218 { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */ 219 { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */ 220 { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */ 221 { 0x0482, 0x0010, USBLP_QUIRK_BIDIR }, /* Kyocera Mita FS 820, by zut <kernel@zut.de> */ 222 { 0x04b8, 0x0202, USBLP_QUIRK_BAD_CLASS }, /* Seiko Epson Receipt Printer M129C */ 223 { 0, 0 } 224 }; 225 226 static int usblp_select_alts(struct usblp *usblp); 227 static int usblp_set_protocol(struct usblp *usblp, int protocol); 228 static int usblp_cache_device_id_string(struct usblp *usblp); 229 230 /* forward reference to make our lives easier */ 231 static struct usb_driver usblp_driver; 232 static DEFINE_MUTEX(usblp_mutex); /* locks the existence of usblp's */ 233 234 /* 235 * Functions for usblp control messages. 236 */ 237 238 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len) 239 { 240 int retval; 241 int index = usblp->ifnum; 242 243 /* High byte has the interface index. 244 Low byte has the alternate setting. 245 */ 246 if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) { 247 index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting; 248 } 249 250 retval = usb_control_msg(usblp->dev, 251 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0), 252 request, type | dir | recip, value, index, buf, len, USBLP_WRITE_TIMEOUT); 253 dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d", 254 request, !!dir, recip, value, index, len, retval); 255 return retval < 0 ? retval : 0; 256 } 257 258 #define usblp_read_status(usblp, status)\ 259 usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1) 260 #define usblp_get_id(usblp, config, id, maxlen)\ 261 usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen) 262 #define usblp_reset(usblp)\ 263 usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0) 264 265 #define usblp_hp_channel_change_request(usblp, channel, buffer) \ 266 usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1) 267 268 /* 269 * See the description for usblp_select_alts() below for the usage 270 * explanation. Look into your /proc/bus/usb/devices and dmesg in 271 * case of any trouble. 272 */ 273 static int proto_bias = -1; 274 275 /* 276 * URB callback. 277 */ 278 279 static void usblp_bulk_read(struct urb *urb) 280 { 281 struct usblp *usblp = urb->context; 282 283 if (unlikely(!usblp || !usblp->dev || !usblp->used)) 284 return; 285 286 if (unlikely(!usblp->present)) 287 goto unplug; 288 if (unlikely(urb->status)) 289 warn("usblp%d: nonzero read/write bulk status received: %d", 290 usblp->minor, urb->status); 291 usblp->rcomplete = 1; 292 unplug: 293 wake_up_interruptible(&usblp->wait); 294 } 295 296 static void usblp_bulk_write(struct urb *urb) 297 { 298 struct usblp *usblp = urb->context; 299 300 if (unlikely(!usblp || !usblp->dev || !usblp->used)) 301 return; 302 if (unlikely(!usblp->present)) 303 goto unplug; 304 if (unlikely(urb->status)) 305 warn("usblp%d: nonzero read/write bulk status received: %d", 306 usblp->minor, urb->status); 307 usblp->wcomplete = 1; 308 unplug: 309 wake_up_interruptible(&usblp->wait); 310 } 311 312 /* 313 * Get and print printer errors. 314 */ 315 316 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" }; 317 318 static int usblp_check_status(struct usblp *usblp, int err) 319 { 320 unsigned char status, newerr = 0; 321 int error; 322 323 error = usblp_read_status (usblp, usblp->statusbuf); 324 if (error < 0) { 325 if (printk_ratelimit()) 326 err("usblp%d: error %d reading printer status", 327 usblp->minor, error); 328 return 0; 329 } 330 331 status = *usblp->statusbuf; 332 333 if (~status & LP_PERRORP) 334 newerr = 3; 335 if (status & LP_POUTPA) 336 newerr = 1; 337 if (~status & LP_PSELECD) 338 newerr = 2; 339 340 if (newerr != err) 341 info("usblp%d: %s", usblp->minor, usblp_messages[newerr]); 342 343 return newerr; 344 } 345 346 static int handle_bidir (struct usblp *usblp) 347 { 348 if (usblp->bidir && usblp->used && !usblp->sleeping) { 349 usblp->readcount = 0; 350 usblp->readurb->dev = usblp->dev; 351 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) { 352 usblp->used = 0; 353 return -EIO; 354 } 355 } 356 357 return 0; 358 } 359 360 /* 361 * File op functions. 362 */ 363 364 static int usblp_open(struct inode *inode, struct file *file) 365 { 366 int minor = iminor(inode); 367 struct usblp *usblp; 368 struct usb_interface *intf; 369 int retval; 370 371 if (minor < 0) 372 return -ENODEV; 373 374 mutex_lock (&usblp_mutex); 375 376 retval = -ENODEV; 377 intf = usb_find_interface(&usblp_driver, minor); 378 if (!intf) { 379 goto out; 380 } 381 usblp = usb_get_intfdata (intf); 382 if (!usblp || !usblp->dev || !usblp->present) 383 goto out; 384 385 retval = -EBUSY; 386 if (usblp->used) 387 goto out; 388 389 /* 390 * TODO: need to implement LP_ABORTOPEN + O_NONBLOCK as in drivers/char/lp.c ??? 391 * This is #if 0-ed because we *don't* want to fail an open 392 * just because the printer is off-line. 393 */ 394 #if 0 395 if ((retval = usblp_check_status(usblp, 0))) { 396 retval = retval > 1 ? -EIO : -ENOSPC; 397 goto out; 398 } 399 #else 400 retval = 0; 401 #endif 402 403 retval = usb_autopm_get_interface(intf); 404 if (retval < 0) 405 goto out; 406 usblp->used = 1; 407 file->private_data = usblp; 408 409 usblp->writeurb->transfer_buffer_length = 0; 410 usblp->wcomplete = 1; /* we begin writeable */ 411 usblp->rcomplete = 0; 412 usblp->writeurb->status = 0; 413 usblp->readurb->status = 0; 414 415 if (handle_bidir(usblp) < 0) { 416 file->private_data = NULL; 417 retval = -EIO; 418 } 419 out: 420 mutex_unlock (&usblp_mutex); 421 return retval; 422 } 423 424 static void usblp_cleanup (struct usblp *usblp) 425 { 426 info("usblp%d: removed", usblp->minor); 427 428 kfree (usblp->device_id_string); 429 kfree (usblp->statusbuf); 430 usb_free_urb(usblp->writeurb); 431 usb_free_urb(usblp->readurb); 432 kfree (usblp); 433 } 434 435 static void usblp_unlink_urbs(struct usblp *usblp) 436 { 437 usb_kill_urb(usblp->writeurb); 438 if (usblp->bidir) 439 usb_kill_urb(usblp->readurb); 440 } 441 442 static int usblp_release(struct inode *inode, struct file *file) 443 { 444 struct usblp *usblp = file->private_data; 445 446 mutex_lock (&usblp_mutex); 447 usblp->used = 0; 448 if (usblp->present) { 449 usblp_unlink_urbs(usblp); 450 usb_autopm_put_interface(usblp->intf); 451 } else /* finish cleanup from disconnect */ 452 usblp_cleanup (usblp); 453 mutex_unlock (&usblp_mutex); 454 return 0; 455 } 456 457 /* No kernel lock - fine */ 458 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait) 459 { 460 struct usblp *usblp = file->private_data; 461 poll_wait(file, &usblp->wait, wait); 462 return ((!usblp->bidir || !usblp->rcomplete) ? 0 : POLLIN | POLLRDNORM) 463 | (!usblp->wcomplete ? 0 : POLLOUT | POLLWRNORM); 464 } 465 466 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 467 { 468 struct usblp *usblp = file->private_data; 469 int length, err, i; 470 unsigned char newChannel; 471 int status; 472 int twoints[2]; 473 int retval = 0; 474 475 mutex_lock (&usblp->mut); 476 if (!usblp->present) { 477 retval = -ENODEV; 478 goto done; 479 } 480 481 if (usblp->sleeping) { 482 retval = -ENODEV; 483 goto done; 484 } 485 486 dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd), 487 _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd) ); 488 489 if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */ 490 491 switch (_IOC_NR(cmd)) { 492 493 case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */ 494 if (_IOC_DIR(cmd) != _IOC_READ) { 495 retval = -EINVAL; 496 goto done; 497 } 498 499 length = usblp_cache_device_id_string(usblp); 500 if (length < 0) { 501 retval = length; 502 goto done; 503 } 504 if (length > _IOC_SIZE(cmd)) 505 length = _IOC_SIZE(cmd); /* truncate */ 506 507 if (copy_to_user((void __user *) arg, 508 usblp->device_id_string, 509 (unsigned long) length)) { 510 retval = -EFAULT; 511 goto done; 512 } 513 514 break; 515 516 case IOCNR_GET_PROTOCOLS: 517 if (_IOC_DIR(cmd) != _IOC_READ || 518 _IOC_SIZE(cmd) < sizeof(twoints)) { 519 retval = -EINVAL; 520 goto done; 521 } 522 523 twoints[0] = usblp->current_protocol; 524 twoints[1] = 0; 525 for (i = USBLP_FIRST_PROTOCOL; 526 i <= USBLP_LAST_PROTOCOL; i++) { 527 if (usblp->protocol[i].alt_setting >= 0) 528 twoints[1] |= (1<<i); 529 } 530 531 if (copy_to_user((void __user *)arg, 532 (unsigned char *)twoints, 533 sizeof(twoints))) { 534 retval = -EFAULT; 535 goto done; 536 } 537 538 break; 539 540 case IOCNR_SET_PROTOCOL: 541 if (_IOC_DIR(cmd) != _IOC_WRITE) { 542 retval = -EINVAL; 543 goto done; 544 } 545 546 #ifdef DEBUG 547 if (arg == -10) { 548 usblp_dump(usblp); 549 break; 550 } 551 #endif 552 553 usblp_unlink_urbs(usblp); 554 retval = usblp_set_protocol(usblp, arg); 555 if (retval < 0) { 556 usblp_set_protocol(usblp, 557 usblp->current_protocol); 558 } 559 break; 560 561 case IOCNR_HP_SET_CHANNEL: 562 if (_IOC_DIR(cmd) != _IOC_WRITE || 563 le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 || 564 usblp->quirks & USBLP_QUIRK_BIDIR) { 565 retval = -EINVAL; 566 goto done; 567 } 568 569 err = usblp_hp_channel_change_request(usblp, 570 arg, &newChannel); 571 if (err < 0) { 572 err("usblp%d: error = %d setting " 573 "HP channel", 574 usblp->minor, err); 575 retval = -EIO; 576 goto done; 577 } 578 579 dbg("usblp%d requested/got HP channel %ld/%d", 580 usblp->minor, arg, newChannel); 581 break; 582 583 case IOCNR_GET_BUS_ADDRESS: 584 if (_IOC_DIR(cmd) != _IOC_READ || 585 _IOC_SIZE(cmd) < sizeof(twoints)) { 586 retval = -EINVAL; 587 goto done; 588 } 589 590 twoints[0] = usblp->dev->bus->busnum; 591 twoints[1] = usblp->dev->devnum; 592 if (copy_to_user((void __user *)arg, 593 (unsigned char *)twoints, 594 sizeof(twoints))) { 595 retval = -EFAULT; 596 goto done; 597 } 598 599 dbg("usblp%d is bus=%d, device=%d", 600 usblp->minor, twoints[0], twoints[1]); 601 break; 602 603 case IOCNR_GET_VID_PID: 604 if (_IOC_DIR(cmd) != _IOC_READ || 605 _IOC_SIZE(cmd) < sizeof(twoints)) { 606 retval = -EINVAL; 607 goto done; 608 } 609 610 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor); 611 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct); 612 if (copy_to_user((void __user *)arg, 613 (unsigned char *)twoints, 614 sizeof(twoints))) { 615 retval = -EFAULT; 616 goto done; 617 } 618 619 dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X", 620 usblp->minor, twoints[0], twoints[1]); 621 break; 622 623 case IOCNR_SOFT_RESET: 624 if (_IOC_DIR(cmd) != _IOC_NONE) { 625 retval = -EINVAL; 626 goto done; 627 } 628 retval = usblp_reset(usblp); 629 break; 630 default: 631 retval = -ENOTTY; 632 } 633 else /* old-style ioctl value */ 634 switch (cmd) { 635 636 case LPGETSTATUS: 637 if (usblp_read_status(usblp, usblp->statusbuf)) { 638 if (printk_ratelimit()) 639 err("usblp%d: failed reading printer status", 640 usblp->minor); 641 retval = -EIO; 642 goto done; 643 } 644 status = *usblp->statusbuf; 645 if (copy_to_user ((void __user *)arg, &status, sizeof(int))) 646 retval = -EFAULT; 647 break; 648 649 default: 650 retval = -ENOTTY; 651 } 652 653 done: 654 mutex_unlock (&usblp->mut); 655 return retval; 656 } 657 658 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) 659 { 660 struct usblp *usblp = file->private_data; 661 int timeout, intr, rv, err = 0, transfer_length = 0; 662 size_t writecount = 0; 663 664 while (writecount < count) { 665 if (!usblp->wcomplete) { 666 barrier(); 667 if (file->f_flags & O_NONBLOCK) { 668 writecount += transfer_length; 669 return writecount ? writecount : -EAGAIN; 670 } 671 672 timeout = USBLP_WRITE_TIMEOUT; 673 674 rv = wait_event_interruptible_timeout(usblp->wait, usblp->wcomplete || !usblp->present , timeout); 675 if (rv < 0) 676 return writecount ? writecount : -EINTR; 677 } 678 intr = mutex_lock_interruptible (&usblp->mut); 679 if (intr) 680 return writecount ? writecount : -EINTR; 681 if (!usblp->present) { 682 mutex_unlock (&usblp->mut); 683 return -ENODEV; 684 } 685 686 if (usblp->sleeping) { 687 mutex_unlock (&usblp->mut); 688 return writecount ? writecount : -ENODEV; 689 } 690 691 if (usblp->writeurb->status != 0) { 692 if (usblp->quirks & USBLP_QUIRK_BIDIR) { 693 if (!usblp->wcomplete) 694 err("usblp%d: error %d writing to printer", 695 usblp->minor, usblp->writeurb->status); 696 err = usblp->writeurb->status; 697 } else 698 err = usblp_check_status(usblp, err); 699 mutex_unlock (&usblp->mut); 700 701 /* if the fault was due to disconnect, let khubd's 702 * call to usblp_disconnect() grab usblp->mut ... 703 */ 704 schedule (); 705 continue; 706 } 707 708 /* We must increment writecount here, and not at the 709 * end of the loop. Otherwise, the final loop iteration may 710 * be skipped, leading to incomplete printer output. 711 */ 712 writecount += transfer_length; 713 if (writecount == count) { 714 mutex_unlock(&usblp->mut); 715 break; 716 } 717 718 transfer_length=(count - writecount); 719 if (transfer_length > USBLP_BUF_SIZE) 720 transfer_length = USBLP_BUF_SIZE; 721 722 usblp->writeurb->transfer_buffer_length = transfer_length; 723 724 if (copy_from_user(usblp->writeurb->transfer_buffer, 725 buffer + writecount, transfer_length)) { 726 mutex_unlock(&usblp->mut); 727 return writecount ? writecount : -EFAULT; 728 } 729 730 usblp->writeurb->dev = usblp->dev; 731 usblp->wcomplete = 0; 732 err = usb_submit_urb(usblp->writeurb, GFP_KERNEL); 733 if (err) { 734 usblp->wcomplete = 1; 735 if (err != -ENOMEM) 736 count = -EIO; 737 else 738 count = writecount ? writecount : -ENOMEM; 739 mutex_unlock (&usblp->mut); 740 break; 741 } 742 mutex_unlock (&usblp->mut); 743 } 744 745 return count; 746 } 747 748 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) 749 { 750 struct usblp *usblp = file->private_data; 751 int rv, intr; 752 753 if (!usblp->bidir) 754 return -EINVAL; 755 756 intr = mutex_lock_interruptible (&usblp->mut); 757 if (intr) 758 return -EINTR; 759 if (!usblp->present) { 760 count = -ENODEV; 761 goto done; 762 } 763 764 if (!usblp->rcomplete) { 765 barrier(); 766 767 if (file->f_flags & O_NONBLOCK) { 768 count = -EAGAIN; 769 goto done; 770 } 771 mutex_unlock(&usblp->mut); 772 rv = wait_event_interruptible(usblp->wait, usblp->rcomplete || !usblp->present); 773 mutex_lock(&usblp->mut); 774 if (rv < 0) { 775 count = -EINTR; 776 goto done; 777 } 778 } 779 780 if (!usblp->present) { 781 count = -ENODEV; 782 goto done; 783 } 784 785 if (usblp->sleeping) { 786 count = -ENODEV; 787 goto done; 788 } 789 790 if (usblp->readurb->status) { 791 err("usblp%d: error %d reading from printer", 792 usblp->minor, usblp->readurb->status); 793 usblp->readurb->dev = usblp->dev; 794 usblp->readcount = 0; 795 usblp->rcomplete = 0; 796 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) 797 dbg("error submitting urb"); 798 count = -EIO; 799 goto done; 800 } 801 802 count = count < usblp->readurb->actual_length - usblp->readcount ? 803 count : usblp->readurb->actual_length - usblp->readcount; 804 805 if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) { 806 count = -EFAULT; 807 goto done; 808 } 809 810 if ((usblp->readcount += count) == usblp->readurb->actual_length) { 811 usblp->readcount = 0; 812 usblp->readurb->dev = usblp->dev; 813 usblp->rcomplete = 0; 814 if (usb_submit_urb(usblp->readurb, GFP_KERNEL)) { 815 count = -EIO; 816 goto done; 817 } 818 } 819 820 done: 821 mutex_unlock (&usblp->mut); 822 return count; 823 } 824 825 /* 826 * Checks for printers that have quirks, such as requiring unidirectional 827 * communication but reporting bidirectional; currently some HP printers 828 * have this flaw (HP 810, 880, 895, etc.), or needing an init string 829 * sent at each open (like some Epsons). 830 * Returns 1 if found, 0 if not found. 831 * 832 * HP recommended that we use the bidirectional interface but 833 * don't attempt any bulk IN transfers from the IN endpoint. 834 * Here's some more detail on the problem: 835 * The problem is not that it isn't bidirectional though. The problem 836 * is that if you request a device ID, or status information, while 837 * the buffers are full, the return data will end up in the print data 838 * buffer. For example if you make sure you never request the device ID 839 * while you are sending print data, and you don't try to query the 840 * printer status every couple of milliseconds, you will probably be OK. 841 */ 842 static unsigned int usblp_quirks (__u16 vendor, __u16 product) 843 { 844 int i; 845 846 for (i = 0; quirk_printers[i].vendorId; i++) { 847 if (vendor == quirk_printers[i].vendorId && 848 product == quirk_printers[i].productId) 849 return quirk_printers[i].quirks; 850 } 851 return 0; 852 } 853 854 static const struct file_operations usblp_fops = { 855 .owner = THIS_MODULE, 856 .read = usblp_read, 857 .write = usblp_write, 858 .poll = usblp_poll, 859 .unlocked_ioctl = usblp_ioctl, 860 .compat_ioctl = usblp_ioctl, 861 .open = usblp_open, 862 .release = usblp_release, 863 }; 864 865 static struct usb_class_driver usblp_class = { 866 .name = "lp%d", 867 .fops = &usblp_fops, 868 .minor_base = USBLP_MINOR_BASE, 869 }; 870 871 static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf) 872 { 873 struct usb_interface *intf = to_usb_interface(dev); 874 struct usblp *usblp = usb_get_intfdata (intf); 875 876 if (usblp->device_id_string[0] == 0 && 877 usblp->device_id_string[1] == 0) 878 return 0; 879 880 return sprintf(buf, "%s", usblp->device_id_string+2); 881 } 882 883 static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL); 884 885 static int usblp_probe(struct usb_interface *intf, 886 const struct usb_device_id *id) 887 { 888 struct usb_device *dev = interface_to_usbdev (intf); 889 struct usblp *usblp = NULL; 890 int protocol; 891 int retval; 892 893 /* Malloc and start initializing usblp structure so we can use it 894 * directly. */ 895 if (!(usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL))) { 896 err("out of memory for usblp"); 897 goto abort; 898 } 899 usblp->dev = dev; 900 mutex_init (&usblp->mut); 901 init_waitqueue_head(&usblp->wait); 902 usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; 903 usblp->intf = intf; 904 905 usblp->writeurb = usb_alloc_urb(0, GFP_KERNEL); 906 if (!usblp->writeurb) { 907 err("out of memory"); 908 goto abort; 909 } 910 usblp->readurb = usb_alloc_urb(0, GFP_KERNEL); 911 if (!usblp->readurb) { 912 err("out of memory"); 913 goto abort; 914 } 915 916 /* Malloc device ID string buffer to the largest expected length, 917 * since we can re-query it on an ioctl and a dynamic string 918 * could change in length. */ 919 if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) { 920 err("out of memory for device_id_string"); 921 goto abort; 922 } 923 924 usblp->writebuf = usblp->readbuf = NULL; 925 usblp->writeurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; 926 usblp->readurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; 927 /* Malloc write & read buffers. We somewhat wastefully 928 * malloc both regardless of bidirectionality, because the 929 * alternate setting can be changed later via an ioctl. */ 930 if (!(usblp->writebuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE, 931 GFP_KERNEL, &usblp->writeurb->transfer_dma))) { 932 err("out of memory for write buf"); 933 goto abort; 934 } 935 if (!(usblp->readbuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE, 936 GFP_KERNEL, &usblp->readurb->transfer_dma))) { 937 err("out of memory for read buf"); 938 goto abort; 939 } 940 941 /* Allocate buffer for printer status */ 942 usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL); 943 if (!usblp->statusbuf) { 944 err("out of memory for statusbuf"); 945 goto abort; 946 } 947 948 /* Lookup quirks for this printer. */ 949 usblp->quirks = usblp_quirks( 950 le16_to_cpu(dev->descriptor.idVendor), 951 le16_to_cpu(dev->descriptor.idProduct)); 952 953 /* Analyze and pick initial alternate settings and endpoints. */ 954 protocol = usblp_select_alts(usblp); 955 if (protocol < 0) { 956 dbg("incompatible printer-class device 0x%4.4X/0x%4.4X", 957 le16_to_cpu(dev->descriptor.idVendor), 958 le16_to_cpu(dev->descriptor.idProduct)); 959 goto abort; 960 } 961 962 /* Setup the selected alternate setting and endpoints. */ 963 if (usblp_set_protocol(usblp, protocol) < 0) 964 goto abort; 965 966 /* Retrieve and store the device ID string. */ 967 usblp_cache_device_id_string(usblp); 968 retval = device_create_file(&intf->dev, &dev_attr_ieee1284_id); 969 if (retval) 970 goto abort_intfdata; 971 972 #ifdef DEBUG 973 usblp_check_status(usblp, 0); 974 #endif 975 976 usb_set_intfdata (intf, usblp); 977 978 usblp->present = 1; 979 980 retval = usb_register_dev(intf, &usblp_class); 981 if (retval) { 982 err("Not able to get a minor for this device."); 983 goto abort_intfdata; 984 } 985 usblp->minor = intf->minor; 986 info("usblp%d: USB %sdirectional printer dev %d " 987 "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X", 988 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum, 989 usblp->ifnum, 990 usblp->protocol[usblp->current_protocol].alt_setting, 991 usblp->current_protocol, 992 le16_to_cpu(usblp->dev->descriptor.idVendor), 993 le16_to_cpu(usblp->dev->descriptor.idProduct)); 994 995 return 0; 996 997 abort_intfdata: 998 usb_set_intfdata (intf, NULL); 999 device_remove_file(&intf->dev, &dev_attr_ieee1284_id); 1000 abort: 1001 if (usblp) { 1002 if (usblp->writebuf) 1003 usb_buffer_free (usblp->dev, USBLP_BUF_SIZE, 1004 usblp->writebuf, usblp->writeurb->transfer_dma); 1005 if (usblp->readbuf) 1006 usb_buffer_free (usblp->dev, USBLP_BUF_SIZE, 1007 usblp->readbuf, usblp->writeurb->transfer_dma); 1008 kfree(usblp->statusbuf); 1009 kfree(usblp->device_id_string); 1010 usb_free_urb(usblp->writeurb); 1011 usb_free_urb(usblp->readurb); 1012 kfree(usblp); 1013 } 1014 return -EIO; 1015 } 1016 1017 /* 1018 * We are a "new" style driver with usb_device_id table, 1019 * but our requirements are too intricate for simple match to handle. 1020 * 1021 * The "proto_bias" option may be used to specify the preferred protocol 1022 * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3). If the device 1023 * supports the preferred protocol, then we bind to it. 1024 * 1025 * The best interface for us is 7/1/2, because it is compatible 1026 * with a stream of characters. If we find it, we bind to it. 1027 * 1028 * Note that the people from hpoj.sourceforge.net need to be able to 1029 * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose. 1030 * 1031 * Failing 7/1/2, we look for 7/1/3, even though it's probably not 1032 * stream-compatible, because this matches the behaviour of the old code. 1033 * 1034 * If nothing else, we bind to 7/1/1 - the unidirectional interface. 1035 */ 1036 static int usblp_select_alts(struct usblp *usblp) 1037 { 1038 struct usb_interface *if_alt; 1039 struct usb_host_interface *ifd; 1040 struct usb_endpoint_descriptor *epd, *epwrite, *epread; 1041 int p, i, e; 1042 1043 if_alt = usblp->intf; 1044 1045 for (p = 0; p < USBLP_MAX_PROTOCOLS; p++) 1046 usblp->protocol[p].alt_setting = -1; 1047 1048 /* Find out what we have. */ 1049 for (i = 0; i < if_alt->num_altsetting; i++) { 1050 ifd = &if_alt->altsetting[i]; 1051 1052 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1) 1053 if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS)) 1054 continue; 1055 1056 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL || 1057 ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL) 1058 continue; 1059 1060 /* Look for bulk OUT and IN endpoints. */ 1061 epwrite = epread = NULL; 1062 for (e = 0; e < ifd->desc.bNumEndpoints; e++) { 1063 epd = &ifd->endpoint[e].desc; 1064 1065 if (usb_endpoint_is_bulk_out(epd)) 1066 if (!epwrite) 1067 epwrite = epd; 1068 1069 if (usb_endpoint_is_bulk_in(epd)) 1070 if (!epread) 1071 epread = epd; 1072 } 1073 1074 /* Ignore buggy hardware without the right endpoints. */ 1075 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread)) 1076 continue; 1077 1078 /* Turn off reads for 7/1/1 (unidirectional) interfaces 1079 * and buggy bidirectional printers. */ 1080 if (ifd->desc.bInterfaceProtocol == 1) { 1081 epread = NULL; 1082 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) { 1083 info("Disabling reads from problem bidirectional " 1084 "printer on usblp%d", usblp->minor); 1085 epread = NULL; 1086 } 1087 1088 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting = 1089 ifd->desc.bAlternateSetting; 1090 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite; 1091 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread; 1092 } 1093 1094 /* If our requested protocol is supported, then use it. */ 1095 if (proto_bias >= USBLP_FIRST_PROTOCOL && 1096 proto_bias <= USBLP_LAST_PROTOCOL && 1097 usblp->protocol[proto_bias].alt_setting != -1) 1098 return proto_bias; 1099 1100 /* Ordering is important here. */ 1101 if (usblp->protocol[2].alt_setting != -1) 1102 return 2; 1103 if (usblp->protocol[1].alt_setting != -1) 1104 return 1; 1105 if (usblp->protocol[3].alt_setting != -1) 1106 return 3; 1107 1108 /* If nothing is available, then don't bind to this device. */ 1109 return -1; 1110 } 1111 1112 static int usblp_set_protocol(struct usblp *usblp, int protocol) 1113 { 1114 int r, alts; 1115 1116 if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL) 1117 return -EINVAL; 1118 1119 alts = usblp->protocol[protocol].alt_setting; 1120 if (alts < 0) 1121 return -EINVAL; 1122 r = usb_set_interface(usblp->dev, usblp->ifnum, alts); 1123 if (r < 0) { 1124 err("can't set desired altsetting %d on interface %d", 1125 alts, usblp->ifnum); 1126 return r; 1127 } 1128 1129 usb_fill_bulk_urb(usblp->writeurb, usblp->dev, 1130 usb_sndbulkpipe(usblp->dev, 1131 usblp->protocol[protocol].epwrite->bEndpointAddress), 1132 usblp->writebuf, 0, 1133 usblp_bulk_write, usblp); 1134 1135 usblp->bidir = (usblp->protocol[protocol].epread != NULL); 1136 if (usblp->bidir) 1137 usb_fill_bulk_urb(usblp->readurb, usblp->dev, 1138 usb_rcvbulkpipe(usblp->dev, 1139 usblp->protocol[protocol].epread->bEndpointAddress), 1140 usblp->readbuf, USBLP_BUF_SIZE, 1141 usblp_bulk_read, usblp); 1142 1143 usblp->current_protocol = protocol; 1144 dbg("usblp%d set protocol %d", usblp->minor, protocol); 1145 return 0; 1146 } 1147 1148 /* Retrieves and caches device ID string. 1149 * Returns length, including length bytes but not null terminator. 1150 * On error, returns a negative errno value. */ 1151 static int usblp_cache_device_id_string(struct usblp *usblp) 1152 { 1153 int err, length; 1154 1155 err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1); 1156 if (err < 0) { 1157 dbg("usblp%d: error = %d reading IEEE-1284 Device ID string", 1158 usblp->minor, err); 1159 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0'; 1160 return -EIO; 1161 } 1162 1163 /* First two bytes are length in big-endian. 1164 * They count themselves, and we copy them into 1165 * the user's buffer. */ 1166 length = be16_to_cpu(*((__be16 *)usblp->device_id_string)); 1167 if (length < 2) 1168 length = 2; 1169 else if (length >= USBLP_DEVICE_ID_SIZE) 1170 length = USBLP_DEVICE_ID_SIZE - 1; 1171 usblp->device_id_string[length] = '\0'; 1172 1173 dbg("usblp%d Device ID string [len=%d]=\"%s\"", 1174 usblp->minor, length, &usblp->device_id_string[2]); 1175 1176 return length; 1177 } 1178 1179 static void usblp_disconnect(struct usb_interface *intf) 1180 { 1181 struct usblp *usblp = usb_get_intfdata (intf); 1182 1183 usb_deregister_dev(intf, &usblp_class); 1184 1185 if (!usblp || !usblp->dev) { 1186 err("bogus disconnect"); 1187 BUG (); 1188 } 1189 1190 device_remove_file(&intf->dev, &dev_attr_ieee1284_id); 1191 1192 mutex_lock (&usblp_mutex); 1193 mutex_lock (&usblp->mut); 1194 usblp->present = 0; 1195 usb_set_intfdata (intf, NULL); 1196 1197 usblp_unlink_urbs(usblp); 1198 usb_buffer_free (usblp->dev, USBLP_BUF_SIZE, 1199 usblp->writebuf, usblp->writeurb->transfer_dma); 1200 usb_buffer_free (usblp->dev, USBLP_BUF_SIZE, 1201 usblp->readbuf, usblp->readurb->transfer_dma); 1202 mutex_unlock (&usblp->mut); 1203 1204 if (!usblp->used) 1205 usblp_cleanup (usblp); 1206 mutex_unlock (&usblp_mutex); 1207 } 1208 1209 static int usblp_suspend (struct usb_interface *intf, pm_message_t message) 1210 { 1211 struct usblp *usblp = usb_get_intfdata (intf); 1212 1213 /* we take no more IO */ 1214 usblp->sleeping = 1; 1215 usblp_unlink_urbs(usblp); 1216 1217 return 0; 1218 } 1219 1220 static int usblp_resume (struct usb_interface *intf) 1221 { 1222 struct usblp *usblp = usb_get_intfdata (intf); 1223 int r; 1224 1225 usblp->sleeping = 0; 1226 r = handle_bidir (usblp); 1227 1228 return r; 1229 } 1230 1231 static struct usb_device_id usblp_ids [] = { 1232 { USB_DEVICE_INFO(7, 1, 1) }, 1233 { USB_DEVICE_INFO(7, 1, 2) }, 1234 { USB_DEVICE_INFO(7, 1, 3) }, 1235 { USB_INTERFACE_INFO(7, 1, 1) }, 1236 { USB_INTERFACE_INFO(7, 1, 2) }, 1237 { USB_INTERFACE_INFO(7, 1, 3) }, 1238 { USB_DEVICE(0x04b8, 0x0202) }, /* Seiko Epson Receipt Printer M129C */ 1239 { } /* Terminating entry */ 1240 }; 1241 1242 MODULE_DEVICE_TABLE (usb, usblp_ids); 1243 1244 static struct usb_driver usblp_driver = { 1245 .name = "usblp", 1246 .probe = usblp_probe, 1247 .disconnect = usblp_disconnect, 1248 .suspend = usblp_suspend, 1249 .resume = usblp_resume, 1250 .id_table = usblp_ids, 1251 .supports_autosuspend = 1, 1252 }; 1253 1254 static int __init usblp_init(void) 1255 { 1256 int retval; 1257 retval = usb_register(&usblp_driver); 1258 if (!retval) 1259 info(DRIVER_VERSION ": " DRIVER_DESC); 1260 1261 return retval; 1262 } 1263 1264 static void __exit usblp_exit(void) 1265 { 1266 usb_deregister(&usblp_driver); 1267 } 1268 1269 module_init(usblp_init); 1270 module_exit(usblp_exit); 1271 1272 MODULE_AUTHOR( DRIVER_AUTHOR ); 1273 MODULE_DESCRIPTION( DRIVER_DESC ); 1274 module_param(proto_bias, int, S_IRUGO | S_IWUSR); 1275 MODULE_PARM_DESC(proto_bias, "Favourite protocol number"); 1276 MODULE_LICENSE("GPL"); 1277