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