1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * usblp.c 4 * 5 * Copyright (c) 1999 Michael Gee <michael@linuxspecific.com> 6 * Copyright (c) 1999 Pavel Machek <pavel@ucw.cz> 7 * Copyright (c) 2000 Randy Dunlap <rdunlap@xenotime.net> 8 * Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz> 9 # Copyright (c) 2001 Pete Zaitcev <zaitcev@redhat.com> 10 # Copyright (c) 2001 David Paschal <paschal@rcsis.com> 11 * Copyright (c) 2006 Oliver Neukum <oliver@neukum.name> 12 * 13 * USB Printer Device Class driver for USB printers and printer cables 14 * 15 * Sponsored by SuSE 16 * 17 * ChangeLog: 18 * v0.1 - thorough cleaning, URBification, almost a rewrite 19 * v0.2 - some more cleanups 20 * v0.3 - cleaner again, waitqueue fixes 21 * v0.4 - fixes in unidirectional mode 22 * v0.5 - add DEVICE_ID string support 23 * v0.6 - never time out 24 * v0.7 - fixed bulk-IN read and poll (David Paschal) 25 * v0.8 - add devfs support 26 * v0.9 - fix unplug-while-open paths 27 * v0.10- remove sleep_on, fix error on oom (oliver@neukum.org) 28 * v0.11 - add proto_bias option (Pete Zaitcev) 29 * v0.12 - add hpoj.sourceforge.net ioctls (David Paschal) 30 * v0.13 - alloc space for statusbuf (<status> not on stack); 31 * use usb_alloc_coherent() for read buf & write buf; 32 * none - Maintained in Linux kernel after v0.13 33 */ 34 35 #include <linux/module.h> 36 #include <linux/kernel.h> 37 #include <linux/sched/signal.h> 38 #include <linux/signal.h> 39 #include <linux/poll.h> 40 #include <linux/slab.h> 41 #include <linux/lp.h> 42 #include <linux/mutex.h> 43 #undef DEBUG 44 #include <linux/usb.h> 45 #include <linux/usb/ch9.h> 46 #include <linux/ratelimit.h> 47 48 /* 49 * Version Information 50 */ 51 #define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal" 52 #define DRIVER_DESC "USB Printer Device Class driver" 53 54 #define USBLP_BUF_SIZE 8192 55 #define USBLP_BUF_SIZE_IN 1024 56 #define USBLP_DEVICE_ID_SIZE 1024 57 58 /* ioctls: */ 59 #define IOCNR_GET_DEVICE_ID 1 60 #define IOCNR_GET_PROTOCOLS 2 61 #define IOCNR_SET_PROTOCOL 3 62 #define IOCNR_HP_SET_CHANNEL 4 63 #define IOCNR_GET_BUS_ADDRESS 5 64 #define IOCNR_GET_VID_PID 6 65 #define IOCNR_SOFT_RESET 7 66 /* Get device_id string: */ 67 #define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len) 68 /* The following ioctls were added for http://hpoj.sourceforge.net: 69 * Get two-int array: 70 * [0]=current protocol 71 * (1=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2, 72 * 3=USB_CLASS_PRINTER/1/3), 73 * [1]=supported protocol mask (mask&(1<<n)!=0 means 74 * USB_CLASS_PRINTER/1/n supported): 75 */ 76 #define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len) 77 /* 78 * Set protocol 79 * (arg: 1=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2, 80 * 3=USB_CLASS_PRINTER/1/3): 81 */ 82 #define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0) 83 /* Set channel number (HP Vendor-specific command): */ 84 #define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0) 85 /* Get two-int array: [0]=bus number, [1]=device address: */ 86 #define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len) 87 /* Get two-int array: [0]=vendor ID, [1]=product ID: */ 88 #define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len) 89 /* Perform class specific soft reset */ 90 #define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0); 91 92 /* 93 * A DEVICE_ID string may include the printer's serial number. 94 * It should end with a semi-colon (';'). 95 * An example from an HP 970C DeskJet printer is (this is one long string, 96 * with the serial number changed): 97 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: ; 98 */ 99 100 /* 101 * USB Printer Requests 102 */ 103 104 #define USBLP_REQ_GET_ID 0x00 105 #define USBLP_REQ_GET_STATUS 0x01 106 #define USBLP_REQ_RESET 0x02 107 #define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST 0x00 /* HP Vendor-specific */ 108 109 #define USBLP_MINORS 16 110 #define USBLP_MINOR_BASE 0 111 112 #define USBLP_CTL_TIMEOUT 5000 /* 5 seconds */ 113 114 #define USBLP_FIRST_PROTOCOL 1 115 #define USBLP_LAST_PROTOCOL 3 116 #define USBLP_MAX_PROTOCOLS (USBLP_LAST_PROTOCOL+1) 117 118 /* 119 * some arbitrary status buffer size; 120 * need a status buffer that is allocated via kmalloc(), not on stack 121 */ 122 #define STATUS_BUF_SIZE 8 123 124 /* 125 * Locks down the locking order: 126 * ->wmut locks wstatus. 127 * ->mut locks the whole usblp, except [rw]complete, and thus, by indirection, 128 * [rw]status. We only touch status when we know the side idle. 129 * ->lock locks what interrupt accesses. 130 */ 131 struct usblp { 132 struct usb_device *dev; /* USB device */ 133 struct mutex wmut; 134 struct mutex mut; 135 spinlock_t lock; /* locks rcomplete, wcomplete */ 136 char *readbuf; /* read transfer_buffer */ 137 char *statusbuf; /* status transfer_buffer */ 138 struct usb_anchor urbs; 139 wait_queue_head_t rwait, wwait; 140 int readcount; /* Counter for reads */ 141 int ifnum; /* Interface number */ 142 struct usb_interface *intf; /* The interface */ 143 /* 144 * Alternate-setting numbers and endpoints for each protocol 145 * (USB_CLASS_PRINTER/1/{index=1,2,3}) that the device supports: 146 */ 147 struct { 148 int alt_setting; 149 struct usb_endpoint_descriptor *epwrite; 150 struct usb_endpoint_descriptor *epread; 151 } protocol[USBLP_MAX_PROTOCOLS]; 152 int current_protocol; 153 int minor; /* minor number of device */ 154 int wcomplete, rcomplete; 155 int wstatus; /* bytes written or error */ 156 int rstatus; /* bytes ready or error */ 157 unsigned int quirks; /* quirks flags */ 158 unsigned int flags; /* mode flags */ 159 unsigned char used; /* True if open */ 160 unsigned char present; /* True if not disconnected */ 161 unsigned char bidir; /* interface is bidirectional */ 162 unsigned char no_paper; /* Paper Out happened */ 163 unsigned char *device_id_string; /* IEEE 1284 DEVICE ID string (ptr) */ 164 /* first 2 bytes are (big-endian) length */ 165 }; 166 167 #ifdef DEBUG 168 static void usblp_dump(struct usblp *usblp) 169 { 170 struct device *dev = &usblp->intf->dev; 171 int p; 172 173 dev_dbg(dev, "usblp=0x%p\n", usblp); 174 dev_dbg(dev, "dev=0x%p\n", usblp->dev); 175 dev_dbg(dev, "present=%d\n", usblp->present); 176 dev_dbg(dev, "readbuf=0x%p\n", usblp->readbuf); 177 dev_dbg(dev, "readcount=%d\n", usblp->readcount); 178 dev_dbg(dev, "ifnum=%d\n", usblp->ifnum); 179 for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) { 180 dev_dbg(dev, "protocol[%d].alt_setting=%d\n", p, 181 usblp->protocol[p].alt_setting); 182 dev_dbg(dev, "protocol[%d].epwrite=%p\n", p, 183 usblp->protocol[p].epwrite); 184 dev_dbg(dev, "protocol[%d].epread=%p\n", p, 185 usblp->protocol[p].epread); 186 } 187 dev_dbg(dev, "current_protocol=%d\n", usblp->current_protocol); 188 dev_dbg(dev, "minor=%d\n", usblp->minor); 189 dev_dbg(dev, "wstatus=%d\n", usblp->wstatus); 190 dev_dbg(dev, "rstatus=%d\n", usblp->rstatus); 191 dev_dbg(dev, "quirks=%d\n", usblp->quirks); 192 dev_dbg(dev, "used=%d\n", usblp->used); 193 dev_dbg(dev, "bidir=%d\n", usblp->bidir); 194 dev_dbg(dev, "device_id_string=\"%s\"\n", 195 usblp->device_id_string ? 196 usblp->device_id_string + 2 : 197 (unsigned char *)"(null)"); 198 } 199 #endif 200 201 /* Quirks: various printer quirks are handled by this table & its flags. */ 202 203 struct quirk_printer_struct { 204 __u16 vendorId; 205 __u16 productId; 206 unsigned int quirks; 207 }; 208 209 #define USBLP_QUIRK_BIDIR 0x1 /* reports bidir but requires unidirectional mode (no INs/reads) */ 210 #define USBLP_QUIRK_USB_INIT 0x2 /* needs vendor USB init string */ 211 #define USBLP_QUIRK_BAD_CLASS 0x4 /* descriptor uses vendor-specific Class or SubClass */ 212 213 static const struct quirk_printer_struct quirk_printers[] = { 214 { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */ 215 { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */ 216 { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */ 217 { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */ 218 { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */ 219 { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */ 220 { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */ 221 { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */ 222 { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */ 223 { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */ 224 { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */ 225 { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */ 226 { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */ 227 { 0x0482, 0x0010, USBLP_QUIRK_BIDIR }, /* Kyocera Mita FS 820, by zut <kernel@zut.de> */ 228 { 0x04f9, 0x000d, USBLP_QUIRK_BIDIR }, /* Brother Industries, Ltd HL-1440 Laser Printer */ 229 { 0x04b8, 0x0202, USBLP_QUIRK_BAD_CLASS }, /* Seiko Epson Receipt Printer M129C */ 230 { 0, 0 } 231 }; 232 233 static int usblp_wwait(struct usblp *usblp, int nonblock); 234 static int usblp_wtest(struct usblp *usblp, int nonblock); 235 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock); 236 static int usblp_rtest(struct usblp *usblp, int nonblock); 237 static int usblp_submit_read(struct usblp *usblp); 238 static int usblp_select_alts(struct usblp *usblp); 239 static int usblp_set_protocol(struct usblp *usblp, int protocol); 240 static int usblp_cache_device_id_string(struct usblp *usblp); 241 242 /* forward reference to make our lives easier */ 243 static struct usb_driver usblp_driver; 244 static DEFINE_MUTEX(usblp_mutex); /* locks the existence of usblp's */ 245 246 /* 247 * Functions for usblp control messages. 248 */ 249 250 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len) 251 { 252 int retval; 253 int index = usblp->ifnum; 254 255 /* High byte has the interface index. 256 Low byte has the alternate setting. 257 */ 258 if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) 259 index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting; 260 261 retval = usb_control_msg(usblp->dev, 262 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0), 263 request, type | dir | recip, value, index, buf, len, USBLP_CTL_TIMEOUT); 264 dev_dbg(&usblp->intf->dev, 265 "usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d\n", 266 request, !!dir, recip, value, index, len, retval); 267 return retval < 0 ? retval : 0; 268 } 269 270 #define usblp_read_status(usblp, status)\ 271 usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1) 272 #define usblp_get_id(usblp, config, id, maxlen)\ 273 usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen) 274 #define usblp_reset(usblp)\ 275 usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0) 276 277 #define usblp_hp_channel_change_request(usblp, channel, buffer) \ 278 usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1) 279 280 /* 281 * See the description for usblp_select_alts() below for the usage 282 * explanation. Look into your /sys/kernel/debug/usb/devices and dmesg in 283 * case of any trouble. 284 */ 285 static int proto_bias = -1; 286 287 /* 288 * URB callback. 289 */ 290 291 static void usblp_bulk_read(struct urb *urb) 292 { 293 struct usblp *usblp = urb->context; 294 int status = urb->status; 295 unsigned long flags; 296 297 if (usblp->present && usblp->used) { 298 if (status) 299 printk(KERN_WARNING "usblp%d: " 300 "nonzero read bulk status received: %d\n", 301 usblp->minor, status); 302 } 303 spin_lock_irqsave(&usblp->lock, flags); 304 if (status < 0) 305 usblp->rstatus = status; 306 else 307 usblp->rstatus = urb->actual_length; 308 usblp->rcomplete = 1; 309 wake_up(&usblp->rwait); 310 spin_unlock_irqrestore(&usblp->lock, flags); 311 312 usb_free_urb(urb); 313 } 314 315 static void usblp_bulk_write(struct urb *urb) 316 { 317 struct usblp *usblp = urb->context; 318 int status = urb->status; 319 unsigned long flags; 320 321 if (usblp->present && usblp->used) { 322 if (status) 323 printk(KERN_WARNING "usblp%d: " 324 "nonzero write bulk status received: %d\n", 325 usblp->minor, status); 326 } 327 spin_lock_irqsave(&usblp->lock, flags); 328 if (status < 0) 329 usblp->wstatus = status; 330 else 331 usblp->wstatus = urb->actual_length; 332 usblp->no_paper = 0; 333 usblp->wcomplete = 1; 334 wake_up(&usblp->wwait); 335 spin_unlock_irqrestore(&usblp->lock, flags); 336 337 usb_free_urb(urb); 338 } 339 340 /* 341 * Get and print printer errors. 342 */ 343 344 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" }; 345 346 static int usblp_check_status(struct usblp *usblp, int err) 347 { 348 unsigned char status, newerr = 0; 349 int error; 350 351 mutex_lock(&usblp->mut); 352 if ((error = usblp_read_status(usblp, usblp->statusbuf)) < 0) { 353 mutex_unlock(&usblp->mut); 354 printk_ratelimited(KERN_ERR 355 "usblp%d: error %d reading printer status\n", 356 usblp->minor, error); 357 return 0; 358 } 359 status = *usblp->statusbuf; 360 mutex_unlock(&usblp->mut); 361 362 if (~status & LP_PERRORP) 363 newerr = 3; 364 if (status & LP_POUTPA) 365 newerr = 1; 366 if (~status & LP_PSELECD) 367 newerr = 2; 368 369 if (newerr != err) { 370 printk(KERN_INFO "usblp%d: %s\n", 371 usblp->minor, usblp_messages[newerr]); 372 } 373 374 return newerr; 375 } 376 377 static int handle_bidir(struct usblp *usblp) 378 { 379 if (usblp->bidir && usblp->used) { 380 if (usblp_submit_read(usblp) < 0) 381 return -EIO; 382 } 383 return 0; 384 } 385 386 /* 387 * File op functions. 388 */ 389 390 static int usblp_open(struct inode *inode, struct file *file) 391 { 392 int minor = iminor(inode); 393 struct usblp *usblp; 394 struct usb_interface *intf; 395 int retval; 396 397 if (minor < 0) 398 return -ENODEV; 399 400 mutex_lock(&usblp_mutex); 401 402 retval = -ENODEV; 403 intf = usb_find_interface(&usblp_driver, minor); 404 if (!intf) 405 goto out; 406 usblp = usb_get_intfdata(intf); 407 if (!usblp || !usblp->dev || !usblp->present) 408 goto out; 409 410 retval = -EBUSY; 411 if (usblp->used) 412 goto out; 413 414 /* 415 * We do not implement LP_ABORTOPEN/LPABORTOPEN for two reasons: 416 * - We do not want persistent state which close(2) does not clear 417 * - It is not used anyway, according to CUPS people 418 */ 419 420 retval = usb_autopm_get_interface(intf); 421 if (retval < 0) 422 goto out; 423 usblp->used = 1; 424 file->private_data = usblp; 425 426 usblp->wcomplete = 1; /* we begin writeable */ 427 usblp->wstatus = 0; 428 usblp->rcomplete = 0; 429 430 if (handle_bidir(usblp) < 0) { 431 usb_autopm_put_interface(intf); 432 usblp->used = 0; 433 file->private_data = NULL; 434 retval = -EIO; 435 } 436 out: 437 mutex_unlock(&usblp_mutex); 438 return retval; 439 } 440 441 static void usblp_cleanup(struct usblp *usblp) 442 { 443 printk(KERN_INFO "usblp%d: removed\n", usblp->minor); 444 445 kfree(usblp->readbuf); 446 kfree(usblp->device_id_string); 447 kfree(usblp->statusbuf); 448 kfree(usblp); 449 } 450 451 static void usblp_unlink_urbs(struct usblp *usblp) 452 { 453 usb_kill_anchored_urbs(&usblp->urbs); 454 } 455 456 static int usblp_release(struct inode *inode, struct file *file) 457 { 458 struct usblp *usblp = file->private_data; 459 460 usblp->flags &= ~LP_ABORT; 461 462 mutex_lock(&usblp_mutex); 463 usblp->used = 0; 464 if (usblp->present) 465 usblp_unlink_urbs(usblp); 466 467 usb_autopm_put_interface(usblp->intf); 468 469 if (!usblp->present) /* finish cleanup from disconnect */ 470 usblp_cleanup(usblp); 471 mutex_unlock(&usblp_mutex); 472 return 0; 473 } 474 475 /* No kernel lock - fine */ 476 static __poll_t usblp_poll(struct file *file, struct poll_table_struct *wait) 477 { 478 __poll_t ret; 479 unsigned long flags; 480 481 struct usblp *usblp = file->private_data; 482 /* Should we check file->f_mode & FMODE_WRITE before poll_wait()? */ 483 poll_wait(file, &usblp->rwait, wait); 484 poll_wait(file, &usblp->wwait, wait); 485 spin_lock_irqsave(&usblp->lock, flags); 486 ret = ((usblp->bidir && usblp->rcomplete) ? EPOLLIN | EPOLLRDNORM : 0) | 487 ((usblp->no_paper || usblp->wcomplete) ? EPOLLOUT | EPOLLWRNORM : 0); 488 spin_unlock_irqrestore(&usblp->lock, flags); 489 return ret; 490 } 491 492 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 493 { 494 struct usblp *usblp = file->private_data; 495 int length, err, i; 496 unsigned char newChannel; 497 int status; 498 int twoints[2]; 499 int retval = 0; 500 501 mutex_lock(&usblp->mut); 502 if (!usblp->present) { 503 retval = -ENODEV; 504 goto done; 505 } 506 507 dev_dbg(&usblp->intf->dev, 508 "usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)\n", cmd, 509 _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd)); 510 511 if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */ 512 513 switch (_IOC_NR(cmd)) { 514 515 case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */ 516 if (_IOC_DIR(cmd) != _IOC_READ) { 517 retval = -EINVAL; 518 goto done; 519 } 520 521 length = usblp_cache_device_id_string(usblp); 522 if (length < 0) { 523 retval = length; 524 goto done; 525 } 526 if (length > _IOC_SIZE(cmd)) 527 length = _IOC_SIZE(cmd); /* truncate */ 528 529 if (copy_to_user((void __user *) arg, 530 usblp->device_id_string, 531 (unsigned long) length)) { 532 retval = -EFAULT; 533 goto done; 534 } 535 536 break; 537 538 case IOCNR_GET_PROTOCOLS: 539 if (_IOC_DIR(cmd) != _IOC_READ || 540 _IOC_SIZE(cmd) < sizeof(twoints)) { 541 retval = -EINVAL; 542 goto done; 543 } 544 545 twoints[0] = usblp->current_protocol; 546 twoints[1] = 0; 547 for (i = USBLP_FIRST_PROTOCOL; 548 i <= USBLP_LAST_PROTOCOL; i++) { 549 if (usblp->protocol[i].alt_setting >= 0) 550 twoints[1] |= (1<<i); 551 } 552 553 if (copy_to_user((void __user *)arg, 554 (unsigned char *)twoints, 555 sizeof(twoints))) { 556 retval = -EFAULT; 557 goto done; 558 } 559 560 break; 561 562 case IOCNR_SET_PROTOCOL: 563 if (_IOC_DIR(cmd) != _IOC_WRITE) { 564 retval = -EINVAL; 565 goto done; 566 } 567 568 #ifdef DEBUG 569 if (arg == -10) { 570 usblp_dump(usblp); 571 break; 572 } 573 #endif 574 575 usblp_unlink_urbs(usblp); 576 retval = usblp_set_protocol(usblp, arg); 577 if (retval < 0) { 578 usblp_set_protocol(usblp, 579 usblp->current_protocol); 580 } 581 break; 582 583 case IOCNR_HP_SET_CHANNEL: 584 if (_IOC_DIR(cmd) != _IOC_WRITE || 585 le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 || 586 usblp->quirks & USBLP_QUIRK_BIDIR) { 587 retval = -EINVAL; 588 goto done; 589 } 590 591 err = usblp_hp_channel_change_request(usblp, 592 arg, &newChannel); 593 if (err < 0) { 594 dev_err(&usblp->dev->dev, 595 "usblp%d: error = %d setting " 596 "HP channel\n", 597 usblp->minor, err); 598 retval = -EIO; 599 goto done; 600 } 601 602 dev_dbg(&usblp->intf->dev, 603 "usblp%d requested/got HP channel %ld/%d\n", 604 usblp->minor, arg, newChannel); 605 break; 606 607 case IOCNR_GET_BUS_ADDRESS: 608 if (_IOC_DIR(cmd) != _IOC_READ || 609 _IOC_SIZE(cmd) < sizeof(twoints)) { 610 retval = -EINVAL; 611 goto done; 612 } 613 614 twoints[0] = usblp->dev->bus->busnum; 615 twoints[1] = usblp->dev->devnum; 616 if (copy_to_user((void __user *)arg, 617 (unsigned char *)twoints, 618 sizeof(twoints))) { 619 retval = -EFAULT; 620 goto done; 621 } 622 623 dev_dbg(&usblp->intf->dev, 624 "usblp%d is bus=%d, device=%d\n", 625 usblp->minor, twoints[0], twoints[1]); 626 break; 627 628 case IOCNR_GET_VID_PID: 629 if (_IOC_DIR(cmd) != _IOC_READ || 630 _IOC_SIZE(cmd) < sizeof(twoints)) { 631 retval = -EINVAL; 632 goto done; 633 } 634 635 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor); 636 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct); 637 if (copy_to_user((void __user *)arg, 638 (unsigned char *)twoints, 639 sizeof(twoints))) { 640 retval = -EFAULT; 641 goto done; 642 } 643 644 dev_dbg(&usblp->intf->dev, 645 "usblp%d is VID=0x%4.4X, PID=0x%4.4X\n", 646 usblp->minor, twoints[0], twoints[1]); 647 break; 648 649 case IOCNR_SOFT_RESET: 650 if (_IOC_DIR(cmd) != _IOC_NONE) { 651 retval = -EINVAL; 652 goto done; 653 } 654 retval = usblp_reset(usblp); 655 break; 656 default: 657 retval = -ENOTTY; 658 } 659 else /* old-style ioctl value */ 660 switch (cmd) { 661 662 case LPGETSTATUS: 663 retval = usblp_read_status(usblp, usblp->statusbuf); 664 if (retval) { 665 printk_ratelimited(KERN_ERR "usblp%d:" 666 "failed reading printer status (%d)\n", 667 usblp->minor, retval); 668 retval = -EIO; 669 goto done; 670 } 671 status = *usblp->statusbuf; 672 if (copy_to_user((void __user *)arg, &status, sizeof(int))) 673 retval = -EFAULT; 674 break; 675 676 case LPABORT: 677 if (arg) 678 usblp->flags |= LP_ABORT; 679 else 680 usblp->flags &= ~LP_ABORT; 681 break; 682 683 default: 684 retval = -ENOTTY; 685 } 686 687 done: 688 mutex_unlock(&usblp->mut); 689 return retval; 690 } 691 692 static struct urb *usblp_new_writeurb(struct usblp *usblp, int transfer_length) 693 { 694 struct urb *urb; 695 char *writebuf; 696 697 writebuf = kmalloc(transfer_length, GFP_KERNEL); 698 if (writebuf == NULL) 699 return NULL; 700 urb = usb_alloc_urb(0, GFP_KERNEL); 701 if (urb == NULL) { 702 kfree(writebuf); 703 return NULL; 704 } 705 706 usb_fill_bulk_urb(urb, usblp->dev, 707 usb_sndbulkpipe(usblp->dev, 708 usblp->protocol[usblp->current_protocol].epwrite->bEndpointAddress), 709 writebuf, transfer_length, usblp_bulk_write, usblp); 710 urb->transfer_flags |= URB_FREE_BUFFER; 711 712 return urb; 713 } 714 715 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) 716 { 717 struct usblp *usblp = file->private_data; 718 struct urb *writeurb; 719 int rv; 720 int transfer_length; 721 ssize_t writecount = 0; 722 723 if (mutex_lock_interruptible(&usblp->wmut)) { 724 rv = -EINTR; 725 goto raise_biglock; 726 } 727 if ((rv = usblp_wwait(usblp, !!(file->f_flags & O_NONBLOCK))) < 0) 728 goto raise_wait; 729 730 while (writecount < count) { 731 /* 732 * Step 1: Submit next block. 733 */ 734 if ((transfer_length = count - writecount) > USBLP_BUF_SIZE) 735 transfer_length = USBLP_BUF_SIZE; 736 737 rv = -ENOMEM; 738 writeurb = usblp_new_writeurb(usblp, transfer_length); 739 if (writeurb == NULL) 740 goto raise_urb; 741 usb_anchor_urb(writeurb, &usblp->urbs); 742 743 if (copy_from_user(writeurb->transfer_buffer, 744 buffer + writecount, transfer_length)) { 745 rv = -EFAULT; 746 goto raise_badaddr; 747 } 748 749 spin_lock_irq(&usblp->lock); 750 usblp->wcomplete = 0; 751 spin_unlock_irq(&usblp->lock); 752 if ((rv = usb_submit_urb(writeurb, GFP_KERNEL)) < 0) { 753 usblp->wstatus = 0; 754 spin_lock_irq(&usblp->lock); 755 usblp->no_paper = 0; 756 usblp->wcomplete = 1; 757 wake_up(&usblp->wwait); 758 spin_unlock_irq(&usblp->lock); 759 if (rv != -ENOMEM) 760 rv = -EIO; 761 goto raise_submit; 762 } 763 764 /* 765 * Step 2: Wait for transfer to end, collect results. 766 */ 767 rv = usblp_wwait(usblp, !!(file->f_flags&O_NONBLOCK)); 768 if (rv < 0) { 769 if (rv == -EAGAIN) { 770 /* Presume that it's going to complete well. */ 771 writecount += transfer_length; 772 } 773 if (rv == -ENOSPC) { 774 spin_lock_irq(&usblp->lock); 775 usblp->no_paper = 1; /* Mark for poll(2) */ 776 spin_unlock_irq(&usblp->lock); 777 writecount += transfer_length; 778 } 779 /* Leave URB dangling, to be cleaned on close. */ 780 goto collect_error; 781 } 782 783 if (usblp->wstatus < 0) { 784 rv = -EIO; 785 goto collect_error; 786 } 787 /* 788 * This is critical: it must be our URB, not other writer's. 789 * The wmut exists mainly to cover us here. 790 */ 791 writecount += usblp->wstatus; 792 } 793 794 mutex_unlock(&usblp->wmut); 795 return writecount; 796 797 raise_submit: 798 raise_badaddr: 799 usb_unanchor_urb(writeurb); 800 usb_free_urb(writeurb); 801 raise_urb: 802 raise_wait: 803 collect_error: /* Out of raise sequence */ 804 mutex_unlock(&usblp->wmut); 805 raise_biglock: 806 return writecount ? writecount : rv; 807 } 808 809 /* 810 * Notice that we fail to restart in a few cases: on EFAULT, on restart 811 * error, etc. This is the historical behaviour. In all such cases we return 812 * EIO, and applications loop in order to get the new read going. 813 */ 814 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t len, loff_t *ppos) 815 { 816 struct usblp *usblp = file->private_data; 817 ssize_t count; 818 ssize_t avail; 819 int rv; 820 821 if (!usblp->bidir) 822 return -EINVAL; 823 824 rv = usblp_rwait_and_lock(usblp, !!(file->f_flags & O_NONBLOCK)); 825 if (rv < 0) 826 return rv; 827 828 if ((avail = usblp->rstatus) < 0) { 829 printk(KERN_ERR "usblp%d: error %d reading from printer\n", 830 usblp->minor, (int)avail); 831 usblp_submit_read(usblp); 832 count = -EIO; 833 goto done; 834 } 835 836 count = len < avail - usblp->readcount ? len : avail - usblp->readcount; 837 if (count != 0 && 838 copy_to_user(buffer, usblp->readbuf + usblp->readcount, count)) { 839 count = -EFAULT; 840 goto done; 841 } 842 843 if ((usblp->readcount += count) == avail) { 844 if (usblp_submit_read(usblp) < 0) { 845 /* We don't want to leak USB return codes into errno. */ 846 if (count == 0) 847 count = -EIO; 848 goto done; 849 } 850 } 851 852 done: 853 mutex_unlock(&usblp->mut); 854 return count; 855 } 856 857 /* 858 * Wait for the write path to come idle. 859 * This is called under the ->wmut, so the idle path stays idle. 860 * 861 * Our write path has a peculiar property: it does not buffer like a tty, 862 * but waits for the write to succeed. This allows our ->release to bug out 863 * without waiting for writes to drain. But it obviously does not work 864 * when O_NONBLOCK is set. So, applications setting O_NONBLOCK must use 865 * select(2) or poll(2) to wait for the buffer to drain before closing. 866 * Alternatively, set blocking mode with fcntl and issue a zero-size write. 867 */ 868 static int usblp_wwait(struct usblp *usblp, int nonblock) 869 { 870 DECLARE_WAITQUEUE(waita, current); 871 int rc; 872 int err = 0; 873 874 add_wait_queue(&usblp->wwait, &waita); 875 for (;;) { 876 if (mutex_lock_interruptible(&usblp->mut)) { 877 rc = -EINTR; 878 break; 879 } 880 set_current_state(TASK_INTERRUPTIBLE); 881 rc = usblp_wtest(usblp, nonblock); 882 mutex_unlock(&usblp->mut); 883 if (rc <= 0) 884 break; 885 886 if (schedule_timeout(msecs_to_jiffies(1500)) == 0) { 887 if (usblp->flags & LP_ABORT) { 888 err = usblp_check_status(usblp, err); 889 if (err == 1) { /* Paper out */ 890 rc = -ENOSPC; 891 break; 892 } 893 } else { 894 /* Prod the printer, Gentoo#251237. */ 895 mutex_lock(&usblp->mut); 896 usblp_read_status(usblp, usblp->statusbuf); 897 mutex_unlock(&usblp->mut); 898 } 899 } 900 } 901 set_current_state(TASK_RUNNING); 902 remove_wait_queue(&usblp->wwait, &waita); 903 return rc; 904 } 905 906 static int usblp_wtest(struct usblp *usblp, int nonblock) 907 { 908 unsigned long flags; 909 910 if (!usblp->present) 911 return -ENODEV; 912 if (signal_pending(current)) 913 return -EINTR; 914 spin_lock_irqsave(&usblp->lock, flags); 915 if (usblp->wcomplete) { 916 spin_unlock_irqrestore(&usblp->lock, flags); 917 return 0; 918 } 919 spin_unlock_irqrestore(&usblp->lock, flags); 920 if (nonblock) 921 return -EAGAIN; 922 return 1; 923 } 924 925 /* 926 * Wait for read bytes to become available. This probably should have been 927 * called usblp_r_lock_and_wait(), because we lock first. But it's a traditional 928 * name for functions which lock and return. 929 * 930 * We do not use wait_event_interruptible because it makes locking iffy. 931 */ 932 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock) 933 { 934 DECLARE_WAITQUEUE(waita, current); 935 int rc; 936 937 add_wait_queue(&usblp->rwait, &waita); 938 for (;;) { 939 if (mutex_lock_interruptible(&usblp->mut)) { 940 rc = -EINTR; 941 break; 942 } 943 set_current_state(TASK_INTERRUPTIBLE); 944 if ((rc = usblp_rtest(usblp, nonblock)) < 0) { 945 mutex_unlock(&usblp->mut); 946 break; 947 } 948 if (rc == 0) /* Keep it locked */ 949 break; 950 mutex_unlock(&usblp->mut); 951 schedule(); 952 } 953 set_current_state(TASK_RUNNING); 954 remove_wait_queue(&usblp->rwait, &waita); 955 return rc; 956 } 957 958 static int usblp_rtest(struct usblp *usblp, int nonblock) 959 { 960 unsigned long flags; 961 962 if (!usblp->present) 963 return -ENODEV; 964 if (signal_pending(current)) 965 return -EINTR; 966 spin_lock_irqsave(&usblp->lock, flags); 967 if (usblp->rcomplete) { 968 spin_unlock_irqrestore(&usblp->lock, flags); 969 return 0; 970 } 971 spin_unlock_irqrestore(&usblp->lock, flags); 972 if (nonblock) 973 return -EAGAIN; 974 return 1; 975 } 976 977 /* 978 * Please check ->bidir and other such things outside for now. 979 */ 980 static int usblp_submit_read(struct usblp *usblp) 981 { 982 struct urb *urb; 983 unsigned long flags; 984 int rc; 985 986 rc = -ENOMEM; 987 urb = usb_alloc_urb(0, GFP_KERNEL); 988 if (urb == NULL) 989 goto raise_urb; 990 991 usb_fill_bulk_urb(urb, usblp->dev, 992 usb_rcvbulkpipe(usblp->dev, 993 usblp->protocol[usblp->current_protocol].epread->bEndpointAddress), 994 usblp->readbuf, USBLP_BUF_SIZE_IN, 995 usblp_bulk_read, usblp); 996 usb_anchor_urb(urb, &usblp->urbs); 997 998 spin_lock_irqsave(&usblp->lock, flags); 999 usblp->readcount = 0; /* XXX Why here? */ 1000 usblp->rcomplete = 0; 1001 spin_unlock_irqrestore(&usblp->lock, flags); 1002 if ((rc = usb_submit_urb(urb, GFP_KERNEL)) < 0) { 1003 dev_dbg(&usblp->intf->dev, "error submitting urb (%d)\n", rc); 1004 spin_lock_irqsave(&usblp->lock, flags); 1005 usblp->rstatus = rc; 1006 usblp->rcomplete = 1; 1007 spin_unlock_irqrestore(&usblp->lock, flags); 1008 goto raise_submit; 1009 } 1010 1011 return 0; 1012 1013 raise_submit: 1014 usb_unanchor_urb(urb); 1015 usb_free_urb(urb); 1016 raise_urb: 1017 return rc; 1018 } 1019 1020 /* 1021 * Checks for printers that have quirks, such as requiring unidirectional 1022 * communication but reporting bidirectional; currently some HP printers 1023 * have this flaw (HP 810, 880, 895, etc.), or needing an init string 1024 * sent at each open (like some Epsons). 1025 * Returns 1 if found, 0 if not found. 1026 * 1027 * HP recommended that we use the bidirectional interface but 1028 * don't attempt any bulk IN transfers from the IN endpoint. 1029 * Here's some more detail on the problem: 1030 * The problem is not that it isn't bidirectional though. The problem 1031 * is that if you request a device ID, or status information, while 1032 * the buffers are full, the return data will end up in the print data 1033 * buffer. For example if you make sure you never request the device ID 1034 * while you are sending print data, and you don't try to query the 1035 * printer status every couple of milliseconds, you will probably be OK. 1036 */ 1037 static unsigned int usblp_quirks(__u16 vendor, __u16 product) 1038 { 1039 int i; 1040 1041 for (i = 0; quirk_printers[i].vendorId; i++) { 1042 if (vendor == quirk_printers[i].vendorId && 1043 product == quirk_printers[i].productId) 1044 return quirk_printers[i].quirks; 1045 } 1046 return 0; 1047 } 1048 1049 static const struct file_operations usblp_fops = { 1050 .owner = THIS_MODULE, 1051 .read = usblp_read, 1052 .write = usblp_write, 1053 .poll = usblp_poll, 1054 .unlocked_ioctl = usblp_ioctl, 1055 .compat_ioctl = usblp_ioctl, 1056 .open = usblp_open, 1057 .release = usblp_release, 1058 .llseek = noop_llseek, 1059 }; 1060 1061 static char *usblp_devnode(struct device *dev, umode_t *mode) 1062 { 1063 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); 1064 } 1065 1066 static struct usb_class_driver usblp_class = { 1067 .name = "lp%d", 1068 .devnode = usblp_devnode, 1069 .fops = &usblp_fops, 1070 .minor_base = USBLP_MINOR_BASE, 1071 }; 1072 1073 static ssize_t ieee1284_id_show(struct device *dev, struct device_attribute *attr, char *buf) 1074 { 1075 struct usb_interface *intf = to_usb_interface(dev); 1076 struct usblp *usblp = usb_get_intfdata(intf); 1077 1078 if (usblp->device_id_string[0] == 0 && 1079 usblp->device_id_string[1] == 0) 1080 return 0; 1081 1082 return sprintf(buf, "%s", usblp->device_id_string+2); 1083 } 1084 1085 static DEVICE_ATTR_RO(ieee1284_id); 1086 1087 static struct attribute *usblp_attrs[] = { 1088 &dev_attr_ieee1284_id.attr, 1089 NULL, 1090 }; 1091 ATTRIBUTE_GROUPS(usblp); 1092 1093 static int usblp_probe(struct usb_interface *intf, 1094 const struct usb_device_id *id) 1095 { 1096 struct usb_device *dev = interface_to_usbdev(intf); 1097 struct usblp *usblp; 1098 int protocol; 1099 int retval; 1100 1101 /* Malloc and start initializing usblp structure so we can use it 1102 * directly. */ 1103 usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL); 1104 if (!usblp) { 1105 retval = -ENOMEM; 1106 goto abort_ret; 1107 } 1108 usblp->dev = dev; 1109 mutex_init(&usblp->wmut); 1110 mutex_init(&usblp->mut); 1111 spin_lock_init(&usblp->lock); 1112 init_waitqueue_head(&usblp->rwait); 1113 init_waitqueue_head(&usblp->wwait); 1114 init_usb_anchor(&usblp->urbs); 1115 usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; 1116 usblp->intf = intf; 1117 1118 /* Malloc device ID string buffer to the largest expected length, 1119 * since we can re-query it on an ioctl and a dynamic string 1120 * could change in length. */ 1121 if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) { 1122 retval = -ENOMEM; 1123 goto abort; 1124 } 1125 1126 /* 1127 * Allocate read buffer. We somewhat wastefully 1128 * malloc both regardless of bidirectionality, because the 1129 * alternate setting can be changed later via an ioctl. 1130 */ 1131 if (!(usblp->readbuf = kmalloc(USBLP_BUF_SIZE_IN, GFP_KERNEL))) { 1132 retval = -ENOMEM; 1133 goto abort; 1134 } 1135 1136 /* Allocate buffer for printer status */ 1137 usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL); 1138 if (!usblp->statusbuf) { 1139 retval = -ENOMEM; 1140 goto abort; 1141 } 1142 1143 /* Lookup quirks for this printer. */ 1144 usblp->quirks = usblp_quirks( 1145 le16_to_cpu(dev->descriptor.idVendor), 1146 le16_to_cpu(dev->descriptor.idProduct)); 1147 1148 /* Analyze and pick initial alternate settings and endpoints. */ 1149 protocol = usblp_select_alts(usblp); 1150 if (protocol < 0) { 1151 dev_dbg(&intf->dev, 1152 "incompatible printer-class device 0x%4.4X/0x%4.4X\n", 1153 le16_to_cpu(dev->descriptor.idVendor), 1154 le16_to_cpu(dev->descriptor.idProduct)); 1155 retval = -ENODEV; 1156 goto abort; 1157 } 1158 1159 /* Setup the selected alternate setting and endpoints. */ 1160 if (usblp_set_protocol(usblp, protocol) < 0) { 1161 retval = -ENODEV; /* ->probe isn't ->ioctl */ 1162 goto abort; 1163 } 1164 1165 /* Retrieve and store the device ID string. */ 1166 usblp_cache_device_id_string(usblp); 1167 1168 #ifdef DEBUG 1169 usblp_check_status(usblp, 0); 1170 #endif 1171 1172 usb_set_intfdata(intf, usblp); 1173 1174 usblp->present = 1; 1175 1176 retval = usb_register_dev(intf, &usblp_class); 1177 if (retval) { 1178 dev_err(&intf->dev, 1179 "usblp: Not able to get a minor (base %u, slice default): %d\n", 1180 USBLP_MINOR_BASE, retval); 1181 goto abort_intfdata; 1182 } 1183 usblp->minor = intf->minor; 1184 dev_info(&intf->dev, 1185 "usblp%d: USB %sdirectional printer dev %d if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X\n", 1186 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum, 1187 usblp->ifnum, 1188 usblp->protocol[usblp->current_protocol].alt_setting, 1189 usblp->current_protocol, 1190 le16_to_cpu(usblp->dev->descriptor.idVendor), 1191 le16_to_cpu(usblp->dev->descriptor.idProduct)); 1192 1193 return 0; 1194 1195 abort_intfdata: 1196 usb_set_intfdata(intf, NULL); 1197 abort: 1198 kfree(usblp->readbuf); 1199 kfree(usblp->statusbuf); 1200 kfree(usblp->device_id_string); 1201 kfree(usblp); 1202 abort_ret: 1203 return retval; 1204 } 1205 1206 /* 1207 * We are a "new" style driver with usb_device_id table, 1208 * but our requirements are too intricate for simple match to handle. 1209 * 1210 * The "proto_bias" option may be used to specify the preferred protocol 1211 * for all USB printers (1=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2, 1212 * 3=USB_CLASS_PRINTER/1/3). If the device supports the preferred protocol, 1213 * then we bind to it. 1214 * 1215 * The best interface for us is USB_CLASS_PRINTER/1/2, because it 1216 * is compatible with a stream of characters. If we find it, we bind to it. 1217 * 1218 * Note that the people from hpoj.sourceforge.net need to be able to 1219 * bind to USB_CLASS_PRINTER/1/3 (MLC/1284.4), so we provide them ioctls 1220 * for this purpose. 1221 * 1222 * Failing USB_CLASS_PRINTER/1/2, we look for USB_CLASS_PRINTER/1/3, 1223 * even though it's probably not stream-compatible, because this matches 1224 * the behaviour of the old code. 1225 * 1226 * If nothing else, we bind to USB_CLASS_PRINTER/1/1 1227 * - the unidirectional interface. 1228 */ 1229 static int usblp_select_alts(struct usblp *usblp) 1230 { 1231 struct usb_interface *if_alt; 1232 struct usb_host_interface *ifd; 1233 struct usb_endpoint_descriptor *epwrite, *epread; 1234 int p, i; 1235 int res; 1236 1237 if_alt = usblp->intf; 1238 1239 for (p = 0; p < USBLP_MAX_PROTOCOLS; p++) 1240 usblp->protocol[p].alt_setting = -1; 1241 1242 /* Find out what we have. */ 1243 for (i = 0; i < if_alt->num_altsetting; i++) { 1244 ifd = &if_alt->altsetting[i]; 1245 1246 if (ifd->desc.bInterfaceClass != USB_CLASS_PRINTER || 1247 ifd->desc.bInterfaceSubClass != 1) 1248 if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS)) 1249 continue; 1250 1251 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL || 1252 ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL) 1253 continue; 1254 1255 /* Look for the expected bulk endpoints. */ 1256 if (ifd->desc.bInterfaceProtocol > 1) { 1257 res = usb_find_common_endpoints(ifd, 1258 &epread, &epwrite, NULL, NULL); 1259 } else { 1260 epread = NULL; 1261 res = usb_find_bulk_out_endpoint(ifd, &epwrite); 1262 } 1263 1264 /* Ignore buggy hardware without the right endpoints. */ 1265 if (res) 1266 continue; 1267 1268 /* Turn off reads for buggy bidirectional printers. */ 1269 if (usblp->quirks & USBLP_QUIRK_BIDIR) { 1270 printk(KERN_INFO "usblp%d: Disabling reads from " 1271 "problematic bidirectional printer\n", 1272 usblp->minor); 1273 epread = NULL; 1274 } 1275 1276 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting = 1277 ifd->desc.bAlternateSetting; 1278 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite; 1279 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread; 1280 } 1281 1282 /* If our requested protocol is supported, then use it. */ 1283 if (proto_bias >= USBLP_FIRST_PROTOCOL && 1284 proto_bias <= USBLP_LAST_PROTOCOL && 1285 usblp->protocol[proto_bias].alt_setting != -1) 1286 return proto_bias; 1287 1288 /* Ordering is important here. */ 1289 if (usblp->protocol[2].alt_setting != -1) 1290 return 2; 1291 if (usblp->protocol[1].alt_setting != -1) 1292 return 1; 1293 if (usblp->protocol[3].alt_setting != -1) 1294 return 3; 1295 1296 /* If nothing is available, then don't bind to this device. */ 1297 return -1; 1298 } 1299 1300 static int usblp_set_protocol(struct usblp *usblp, int protocol) 1301 { 1302 int r, alts; 1303 1304 if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL) 1305 return -EINVAL; 1306 1307 alts = usblp->protocol[protocol].alt_setting; 1308 if (alts < 0) 1309 return -EINVAL; 1310 r = usb_set_interface(usblp->dev, usblp->ifnum, alts); 1311 if (r < 0) { 1312 printk(KERN_ERR "usblp: can't set desired altsetting %d on interface %d\n", 1313 alts, usblp->ifnum); 1314 return r; 1315 } 1316 1317 usblp->bidir = (usblp->protocol[protocol].epread != NULL); 1318 usblp->current_protocol = protocol; 1319 dev_dbg(&usblp->intf->dev, "usblp%d set protocol %d\n", 1320 usblp->minor, protocol); 1321 return 0; 1322 } 1323 1324 /* Retrieves and caches device ID string. 1325 * Returns length, including length bytes but not null terminator. 1326 * On error, returns a negative errno value. */ 1327 static int usblp_cache_device_id_string(struct usblp *usblp) 1328 { 1329 int err, length; 1330 1331 err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1); 1332 if (err < 0) { 1333 dev_dbg(&usblp->intf->dev, 1334 "usblp%d: error = %d reading IEEE-1284 Device ID string\n", 1335 usblp->minor, err); 1336 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0'; 1337 return -EIO; 1338 } 1339 1340 /* First two bytes are length in big-endian. 1341 * They count themselves, and we copy them into 1342 * the user's buffer. */ 1343 length = be16_to_cpu(*((__be16 *)usblp->device_id_string)); 1344 if (length < 2) 1345 length = 2; 1346 else if (length >= USBLP_DEVICE_ID_SIZE) 1347 length = USBLP_DEVICE_ID_SIZE - 1; 1348 usblp->device_id_string[length] = '\0'; 1349 1350 dev_dbg(&usblp->intf->dev, "usblp%d Device ID string [len=%d]=\"%s\"\n", 1351 usblp->minor, length, &usblp->device_id_string[2]); 1352 1353 return length; 1354 } 1355 1356 static void usblp_disconnect(struct usb_interface *intf) 1357 { 1358 struct usblp *usblp = usb_get_intfdata(intf); 1359 1360 usb_deregister_dev(intf, &usblp_class); 1361 1362 if (!usblp || !usblp->dev) { 1363 dev_err(&intf->dev, "bogus disconnect\n"); 1364 BUG(); 1365 } 1366 1367 mutex_lock(&usblp_mutex); 1368 mutex_lock(&usblp->mut); 1369 usblp->present = 0; 1370 wake_up(&usblp->wwait); 1371 wake_up(&usblp->rwait); 1372 usb_set_intfdata(intf, NULL); 1373 1374 usblp_unlink_urbs(usblp); 1375 mutex_unlock(&usblp->mut); 1376 1377 if (!usblp->used) 1378 usblp_cleanup(usblp); 1379 mutex_unlock(&usblp_mutex); 1380 } 1381 1382 static int usblp_suspend(struct usb_interface *intf, pm_message_t message) 1383 { 1384 struct usblp *usblp = usb_get_intfdata(intf); 1385 1386 usblp_unlink_urbs(usblp); 1387 #if 0 /* XXX Do we want this? What if someone is reading, should we fail? */ 1388 /* not strictly necessary, but just in case */ 1389 wake_up(&usblp->wwait); 1390 wake_up(&usblp->rwait); 1391 #endif 1392 1393 return 0; 1394 } 1395 1396 static int usblp_resume(struct usb_interface *intf) 1397 { 1398 struct usblp *usblp = usb_get_intfdata(intf); 1399 int r; 1400 1401 r = handle_bidir(usblp); 1402 1403 return r; 1404 } 1405 1406 static const struct usb_device_id usblp_ids[] = { 1407 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 1) }, 1408 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 2) }, 1409 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 3) }, 1410 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 1) }, 1411 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 2) }, 1412 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 3) }, 1413 { USB_DEVICE(0x04b8, 0x0202) }, /* Seiko Epson Receipt Printer M129C */ 1414 { } /* Terminating entry */ 1415 }; 1416 1417 MODULE_DEVICE_TABLE(usb, usblp_ids); 1418 1419 static struct usb_driver usblp_driver = { 1420 .name = "usblp", 1421 .probe = usblp_probe, 1422 .disconnect = usblp_disconnect, 1423 .suspend = usblp_suspend, 1424 .resume = usblp_resume, 1425 .id_table = usblp_ids, 1426 .dev_groups = usblp_groups, 1427 .supports_autosuspend = 1, 1428 }; 1429 1430 module_usb_driver(usblp_driver); 1431 1432 MODULE_AUTHOR(DRIVER_AUTHOR); 1433 MODULE_DESCRIPTION(DRIVER_DESC); 1434 module_param(proto_bias, int, S_IRUGO | S_IWUSR); 1435 MODULE_PARM_DESC(proto_bias, "Favourite protocol number"); 1436 MODULE_LICENSE("GPL"); 1437