1 /* 2 * usblp.c 3 * 4 * Copyright (c) 1999 Michael Gee <michael@linuxspecific.com> 5 * Copyright (c) 1999 Pavel Machek <pavel@ucw.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_alloc_coherent() for read buf & write buf; 31 * none - Maintained in Linux kernel after v0.13 32 */ 33 34 /* 35 * This program is free software; you can redistribute it and/or modify 36 * it under the terms of the GNU General Public License as published by 37 * the Free Software Foundation; either version 2 of the License, or 38 * (at your option) any later version. 39 * 40 * This program is distributed in the hope that it will be useful, 41 * but WITHOUT ANY WARRANTY; without even the implied warranty of 42 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 43 * GNU General Public License for more details. 44 * 45 * You should have received a copy of the GNU General Public License 46 * along with this program; if not, write to the Free Software 47 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 48 */ 49 50 #include <linux/module.h> 51 #include <linux/kernel.h> 52 #include <linux/sched/signal.h> 53 #include <linux/signal.h> 54 #include <linux/poll.h> 55 #include <linux/slab.h> 56 #include <linux/lp.h> 57 #include <linux/mutex.h> 58 #undef DEBUG 59 #include <linux/usb.h> 60 #include <linux/usb/ch9.h> 61 #include <linux/ratelimit.h> 62 63 /* 64 * Version Information 65 */ 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_BUF_SIZE_IN 1024 71 #define USBLP_DEVICE_ID_SIZE 1024 72 73 /* ioctls: */ 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 86 * (1=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2, 87 * 3=USB_CLASS_PRINTER/1/3), 88 * [1]=supported protocol mask (mask&(1<<n)!=0 means 89 * USB_CLASS_PRINTER/1/n supported): 90 */ 91 #define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len) 92 /* 93 * Set protocol 94 * (arg: 1=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2, 95 * 3=USB_CLASS_PRINTER/1/3): 96 */ 97 #define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0) 98 /* Set channel number (HP Vendor-specific command): */ 99 #define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0) 100 /* Get two-int array: [0]=bus number, [1]=device address: */ 101 #define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len) 102 /* Get two-int array: [0]=vendor ID, [1]=product ID: */ 103 #define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len) 104 /* Perform class specific soft reset */ 105 #define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0); 106 107 /* 108 * A DEVICE_ID string may include the printer's serial number. 109 * It should end with a semi-colon (';'). 110 * An example from an HP 970C DeskJet printer is (this is one long string, 111 * with the serial number changed): 112 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: ; 113 */ 114 115 /* 116 * USB Printer Requests 117 */ 118 119 #define USBLP_REQ_GET_ID 0x00 120 #define USBLP_REQ_GET_STATUS 0x01 121 #define USBLP_REQ_RESET 0x02 122 #define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST 0x00 /* HP Vendor-specific */ 123 124 #define USBLP_MINORS 16 125 #define USBLP_MINOR_BASE 0 126 127 #define USBLP_CTL_TIMEOUT 5000 /* 5 seconds */ 128 129 #define USBLP_FIRST_PROTOCOL 1 130 #define USBLP_LAST_PROTOCOL 3 131 #define USBLP_MAX_PROTOCOLS (USBLP_LAST_PROTOCOL+1) 132 133 /* 134 * some arbitrary status buffer size; 135 * need a status buffer that is allocated via kmalloc(), not on stack 136 */ 137 #define STATUS_BUF_SIZE 8 138 139 /* 140 * Locks down the locking order: 141 * ->wmut locks wstatus. 142 * ->mut locks the whole usblp, except [rw]complete, and thus, by indirection, 143 * [rw]status. We only touch status when we know the side idle. 144 * ->lock locks what interrupt accesses. 145 */ 146 struct usblp { 147 struct usb_device *dev; /* USB device */ 148 struct mutex wmut; 149 struct mutex mut; 150 spinlock_t lock; /* locks rcomplete, wcomplete */ 151 char *readbuf; /* read transfer_buffer */ 152 char *statusbuf; /* status transfer_buffer */ 153 struct usb_anchor urbs; 154 wait_queue_head_t rwait, wwait; 155 int readcount; /* Counter for reads */ 156 int ifnum; /* Interface number */ 157 struct usb_interface *intf; /* The interface */ 158 /* 159 * Alternate-setting numbers and endpoints for each protocol 160 * (USB_CLASS_PRINTER/1/{index=1,2,3}) that the device supports: 161 */ 162 struct { 163 int alt_setting; 164 struct usb_endpoint_descriptor *epwrite; 165 struct usb_endpoint_descriptor *epread; 166 } protocol[USBLP_MAX_PROTOCOLS]; 167 int current_protocol; 168 int minor; /* minor number of device */ 169 int wcomplete, rcomplete; 170 int wstatus; /* bytes written or error */ 171 int rstatus; /* bytes ready or error */ 172 unsigned int quirks; /* quirks flags */ 173 unsigned int flags; /* mode flags */ 174 unsigned char used; /* True if open */ 175 unsigned char present; /* True if not disconnected */ 176 unsigned char bidir; /* interface is bidirectional */ 177 unsigned char no_paper; /* Paper Out happened */ 178 unsigned char *device_id_string; /* IEEE 1284 DEVICE ID string (ptr) */ 179 /* first 2 bytes are (big-endian) length */ 180 }; 181 182 #ifdef DEBUG 183 static void usblp_dump(struct usblp *usblp) 184 { 185 struct device *dev = &usblp->intf->dev; 186 int p; 187 188 dev_dbg(dev, "usblp=0x%p\n", usblp); 189 dev_dbg(dev, "dev=0x%p\n", usblp->dev); 190 dev_dbg(dev, "present=%d\n", usblp->present); 191 dev_dbg(dev, "readbuf=0x%p\n", usblp->readbuf); 192 dev_dbg(dev, "readcount=%d\n", usblp->readcount); 193 dev_dbg(dev, "ifnum=%d\n", usblp->ifnum); 194 for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) { 195 dev_dbg(dev, "protocol[%d].alt_setting=%d\n", p, 196 usblp->protocol[p].alt_setting); 197 dev_dbg(dev, "protocol[%d].epwrite=%p\n", p, 198 usblp->protocol[p].epwrite); 199 dev_dbg(dev, "protocol[%d].epread=%p\n", p, 200 usblp->protocol[p].epread); 201 } 202 dev_dbg(dev, "current_protocol=%d\n", usblp->current_protocol); 203 dev_dbg(dev, "minor=%d\n", usblp->minor); 204 dev_dbg(dev, "wstatus=%d\n", usblp->wstatus); 205 dev_dbg(dev, "rstatus=%d\n", usblp->rstatus); 206 dev_dbg(dev, "quirks=%d\n", usblp->quirks); 207 dev_dbg(dev, "used=%d\n", usblp->used); 208 dev_dbg(dev, "bidir=%d\n", usblp->bidir); 209 dev_dbg(dev, "device_id_string=\"%s\"\n", 210 usblp->device_id_string ? 211 usblp->device_id_string + 2 : 212 (unsigned char *)"(null)"); 213 } 214 #endif 215 216 /* Quirks: various printer quirks are handled by this table & its flags. */ 217 218 struct quirk_printer_struct { 219 __u16 vendorId; 220 __u16 productId; 221 unsigned int quirks; 222 }; 223 224 #define USBLP_QUIRK_BIDIR 0x1 /* reports bidir but requires unidirectional mode (no INs/reads) */ 225 #define USBLP_QUIRK_USB_INIT 0x2 /* needs vendor USB init string */ 226 #define USBLP_QUIRK_BAD_CLASS 0x4 /* descriptor uses vendor-specific Class or SubClass */ 227 228 static const struct quirk_printer_struct quirk_printers[] = { 229 { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */ 230 { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */ 231 { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */ 232 { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */ 233 { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */ 234 { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */ 235 { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */ 236 { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */ 237 { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */ 238 { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */ 239 { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */ 240 { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */ 241 { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */ 242 { 0x0482, 0x0010, USBLP_QUIRK_BIDIR }, /* Kyocera Mita FS 820, by zut <kernel@zut.de> */ 243 { 0x04f9, 0x000d, USBLP_QUIRK_BIDIR }, /* Brother Industries, Ltd HL-1440 Laser Printer */ 244 { 0x04b8, 0x0202, USBLP_QUIRK_BAD_CLASS }, /* Seiko Epson Receipt Printer M129C */ 245 { 0, 0 } 246 }; 247 248 static int usblp_wwait(struct usblp *usblp, int nonblock); 249 static int usblp_wtest(struct usblp *usblp, int nonblock); 250 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock); 251 static int usblp_rtest(struct usblp *usblp, int nonblock); 252 static int usblp_submit_read(struct usblp *usblp); 253 static int usblp_select_alts(struct usblp *usblp); 254 static int usblp_set_protocol(struct usblp *usblp, int protocol); 255 static int usblp_cache_device_id_string(struct usblp *usblp); 256 257 /* forward reference to make our lives easier */ 258 static struct usb_driver usblp_driver; 259 static DEFINE_MUTEX(usblp_mutex); /* locks the existence of usblp's */ 260 261 /* 262 * Functions for usblp control messages. 263 */ 264 265 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len) 266 { 267 int retval; 268 int index = usblp->ifnum; 269 270 /* High byte has the interface index. 271 Low byte has the alternate setting. 272 */ 273 if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) 274 index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting; 275 276 retval = usb_control_msg(usblp->dev, 277 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0), 278 request, type | dir | recip, value, index, buf, len, USBLP_CTL_TIMEOUT); 279 dev_dbg(&usblp->intf->dev, 280 "usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d\n", 281 request, !!dir, recip, value, index, len, retval); 282 return retval < 0 ? retval : 0; 283 } 284 285 #define usblp_read_status(usblp, status)\ 286 usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1) 287 #define usblp_get_id(usblp, config, id, maxlen)\ 288 usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen) 289 #define usblp_reset(usblp)\ 290 usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0) 291 292 #define usblp_hp_channel_change_request(usblp, channel, buffer) \ 293 usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1) 294 295 /* 296 * See the description for usblp_select_alts() below for the usage 297 * explanation. Look into your /sys/kernel/debug/usb/devices and dmesg in 298 * case of any trouble. 299 */ 300 static int proto_bias = -1; 301 302 /* 303 * URB callback. 304 */ 305 306 static void usblp_bulk_read(struct urb *urb) 307 { 308 struct usblp *usblp = urb->context; 309 int status = urb->status; 310 311 if (usblp->present && usblp->used) { 312 if (status) 313 printk(KERN_WARNING "usblp%d: " 314 "nonzero read bulk status received: %d\n", 315 usblp->minor, status); 316 } 317 spin_lock(&usblp->lock); 318 if (status < 0) 319 usblp->rstatus = status; 320 else 321 usblp->rstatus = urb->actual_length; 322 usblp->rcomplete = 1; 323 wake_up(&usblp->rwait); 324 spin_unlock(&usblp->lock); 325 326 usb_free_urb(urb); 327 } 328 329 static void usblp_bulk_write(struct urb *urb) 330 { 331 struct usblp *usblp = urb->context; 332 int status = urb->status; 333 334 if (usblp->present && usblp->used) { 335 if (status) 336 printk(KERN_WARNING "usblp%d: " 337 "nonzero write bulk status received: %d\n", 338 usblp->minor, status); 339 } 340 spin_lock(&usblp->lock); 341 if (status < 0) 342 usblp->wstatus = status; 343 else 344 usblp->wstatus = urb->actual_length; 345 usblp->no_paper = 0; 346 usblp->wcomplete = 1; 347 wake_up(&usblp->wwait); 348 spin_unlock(&usblp->lock); 349 350 usb_free_urb(urb); 351 } 352 353 /* 354 * Get and print printer errors. 355 */ 356 357 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" }; 358 359 static int usblp_check_status(struct usblp *usblp, int err) 360 { 361 unsigned char status, newerr = 0; 362 int error; 363 364 mutex_lock(&usblp->mut); 365 if ((error = usblp_read_status(usblp, usblp->statusbuf)) < 0) { 366 mutex_unlock(&usblp->mut); 367 printk_ratelimited(KERN_ERR 368 "usblp%d: error %d reading printer status\n", 369 usblp->minor, error); 370 return 0; 371 } 372 status = *usblp->statusbuf; 373 mutex_unlock(&usblp->mut); 374 375 if (~status & LP_PERRORP) 376 newerr = 3; 377 if (status & LP_POUTPA) 378 newerr = 1; 379 if (~status & LP_PSELECD) 380 newerr = 2; 381 382 if (newerr != err) { 383 printk(KERN_INFO "usblp%d: %s\n", 384 usblp->minor, usblp_messages[newerr]); 385 } 386 387 return newerr; 388 } 389 390 static int handle_bidir(struct usblp *usblp) 391 { 392 if (usblp->bidir && usblp->used) { 393 if (usblp_submit_read(usblp) < 0) 394 return -EIO; 395 } 396 return 0; 397 } 398 399 /* 400 * File op functions. 401 */ 402 403 static int usblp_open(struct inode *inode, struct file *file) 404 { 405 int minor = iminor(inode); 406 struct usblp *usblp; 407 struct usb_interface *intf; 408 int retval; 409 410 if (minor < 0) 411 return -ENODEV; 412 413 mutex_lock(&usblp_mutex); 414 415 retval = -ENODEV; 416 intf = usb_find_interface(&usblp_driver, minor); 417 if (!intf) 418 goto out; 419 usblp = usb_get_intfdata(intf); 420 if (!usblp || !usblp->dev || !usblp->present) 421 goto out; 422 423 retval = -EBUSY; 424 if (usblp->used) 425 goto out; 426 427 /* 428 * We do not implement LP_ABORTOPEN/LPABORTOPEN for two reasons: 429 * - We do not want persistent state which close(2) does not clear 430 * - It is not used anyway, according to CUPS people 431 */ 432 433 retval = usb_autopm_get_interface(intf); 434 if (retval < 0) 435 goto out; 436 usblp->used = 1; 437 file->private_data = usblp; 438 439 usblp->wcomplete = 1; /* we begin writeable */ 440 usblp->wstatus = 0; 441 usblp->rcomplete = 0; 442 443 if (handle_bidir(usblp) < 0) { 444 usb_autopm_put_interface(intf); 445 usblp->used = 0; 446 file->private_data = NULL; 447 retval = -EIO; 448 } 449 out: 450 mutex_unlock(&usblp_mutex); 451 return retval; 452 } 453 454 static void usblp_cleanup(struct usblp *usblp) 455 { 456 printk(KERN_INFO "usblp%d: removed\n", usblp->minor); 457 458 kfree(usblp->readbuf); 459 kfree(usblp->device_id_string); 460 kfree(usblp->statusbuf); 461 kfree(usblp); 462 } 463 464 static void usblp_unlink_urbs(struct usblp *usblp) 465 { 466 usb_kill_anchored_urbs(&usblp->urbs); 467 } 468 469 static int usblp_release(struct inode *inode, struct file *file) 470 { 471 struct usblp *usblp = file->private_data; 472 473 usblp->flags &= ~LP_ABORT; 474 475 mutex_lock(&usblp_mutex); 476 usblp->used = 0; 477 if (usblp->present) { 478 usblp_unlink_urbs(usblp); 479 usb_autopm_put_interface(usblp->intf); 480 } else /* finish cleanup from disconnect */ 481 usblp_cleanup(usblp); 482 mutex_unlock(&usblp_mutex); 483 return 0; 484 } 485 486 /* No kernel lock - fine */ 487 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait) 488 { 489 int ret; 490 unsigned long flags; 491 492 struct usblp *usblp = file->private_data; 493 /* Should we check file->f_mode & FMODE_WRITE before poll_wait()? */ 494 poll_wait(file, &usblp->rwait, wait); 495 poll_wait(file, &usblp->wwait, wait); 496 spin_lock_irqsave(&usblp->lock, flags); 497 ret = ((usblp->bidir && usblp->rcomplete) ? POLLIN | POLLRDNORM : 0) | 498 ((usblp->no_paper || usblp->wcomplete) ? POLLOUT | POLLWRNORM : 0); 499 spin_unlock_irqrestore(&usblp->lock, flags); 500 return ret; 501 } 502 503 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 504 { 505 struct usblp *usblp = file->private_data; 506 int length, err, i; 507 unsigned char newChannel; 508 int status; 509 int twoints[2]; 510 int retval = 0; 511 512 mutex_lock(&usblp->mut); 513 if (!usblp->present) { 514 retval = -ENODEV; 515 goto done; 516 } 517 518 dev_dbg(&usblp->intf->dev, 519 "usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)\n", cmd, 520 _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd)); 521 522 if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */ 523 524 switch (_IOC_NR(cmd)) { 525 526 case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */ 527 if (_IOC_DIR(cmd) != _IOC_READ) { 528 retval = -EINVAL; 529 goto done; 530 } 531 532 length = usblp_cache_device_id_string(usblp); 533 if (length < 0) { 534 retval = length; 535 goto done; 536 } 537 if (length > _IOC_SIZE(cmd)) 538 length = _IOC_SIZE(cmd); /* truncate */ 539 540 if (copy_to_user((void __user *) arg, 541 usblp->device_id_string, 542 (unsigned long) length)) { 543 retval = -EFAULT; 544 goto done; 545 } 546 547 break; 548 549 case IOCNR_GET_PROTOCOLS: 550 if (_IOC_DIR(cmd) != _IOC_READ || 551 _IOC_SIZE(cmd) < sizeof(twoints)) { 552 retval = -EINVAL; 553 goto done; 554 } 555 556 twoints[0] = usblp->current_protocol; 557 twoints[1] = 0; 558 for (i = USBLP_FIRST_PROTOCOL; 559 i <= USBLP_LAST_PROTOCOL; i++) { 560 if (usblp->protocol[i].alt_setting >= 0) 561 twoints[1] |= (1<<i); 562 } 563 564 if (copy_to_user((void __user *)arg, 565 (unsigned char *)twoints, 566 sizeof(twoints))) { 567 retval = -EFAULT; 568 goto done; 569 } 570 571 break; 572 573 case IOCNR_SET_PROTOCOL: 574 if (_IOC_DIR(cmd) != _IOC_WRITE) { 575 retval = -EINVAL; 576 goto done; 577 } 578 579 #ifdef DEBUG 580 if (arg == -10) { 581 usblp_dump(usblp); 582 break; 583 } 584 #endif 585 586 usblp_unlink_urbs(usblp); 587 retval = usblp_set_protocol(usblp, arg); 588 if (retval < 0) { 589 usblp_set_protocol(usblp, 590 usblp->current_protocol); 591 } 592 break; 593 594 case IOCNR_HP_SET_CHANNEL: 595 if (_IOC_DIR(cmd) != _IOC_WRITE || 596 le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 || 597 usblp->quirks & USBLP_QUIRK_BIDIR) { 598 retval = -EINVAL; 599 goto done; 600 } 601 602 err = usblp_hp_channel_change_request(usblp, 603 arg, &newChannel); 604 if (err < 0) { 605 dev_err(&usblp->dev->dev, 606 "usblp%d: error = %d setting " 607 "HP channel\n", 608 usblp->minor, err); 609 retval = -EIO; 610 goto done; 611 } 612 613 dev_dbg(&usblp->intf->dev, 614 "usblp%d requested/got HP channel %ld/%d\n", 615 usblp->minor, arg, newChannel); 616 break; 617 618 case IOCNR_GET_BUS_ADDRESS: 619 if (_IOC_DIR(cmd) != _IOC_READ || 620 _IOC_SIZE(cmd) < sizeof(twoints)) { 621 retval = -EINVAL; 622 goto done; 623 } 624 625 twoints[0] = usblp->dev->bus->busnum; 626 twoints[1] = usblp->dev->devnum; 627 if (copy_to_user((void __user *)arg, 628 (unsigned char *)twoints, 629 sizeof(twoints))) { 630 retval = -EFAULT; 631 goto done; 632 } 633 634 dev_dbg(&usblp->intf->dev, 635 "usblp%d is bus=%d, device=%d\n", 636 usblp->minor, twoints[0], twoints[1]); 637 break; 638 639 case IOCNR_GET_VID_PID: 640 if (_IOC_DIR(cmd) != _IOC_READ || 641 _IOC_SIZE(cmd) < sizeof(twoints)) { 642 retval = -EINVAL; 643 goto done; 644 } 645 646 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor); 647 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct); 648 if (copy_to_user((void __user *)arg, 649 (unsigned char *)twoints, 650 sizeof(twoints))) { 651 retval = -EFAULT; 652 goto done; 653 } 654 655 dev_dbg(&usblp->intf->dev, 656 "usblp%d is VID=0x%4.4X, PID=0x%4.4X\n", 657 usblp->minor, twoints[0], twoints[1]); 658 break; 659 660 case IOCNR_SOFT_RESET: 661 if (_IOC_DIR(cmd) != _IOC_NONE) { 662 retval = -EINVAL; 663 goto done; 664 } 665 retval = usblp_reset(usblp); 666 break; 667 default: 668 retval = -ENOTTY; 669 } 670 else /* old-style ioctl value */ 671 switch (cmd) { 672 673 case LPGETSTATUS: 674 retval = usblp_read_status(usblp, usblp->statusbuf); 675 if (retval) { 676 printk_ratelimited(KERN_ERR "usblp%d:" 677 "failed reading printer status (%d)\n", 678 usblp->minor, retval); 679 retval = -EIO; 680 goto done; 681 } 682 status = *usblp->statusbuf; 683 if (copy_to_user((void __user *)arg, &status, sizeof(int))) 684 retval = -EFAULT; 685 break; 686 687 case LPABORT: 688 if (arg) 689 usblp->flags |= LP_ABORT; 690 else 691 usblp->flags &= ~LP_ABORT; 692 break; 693 694 default: 695 retval = -ENOTTY; 696 } 697 698 done: 699 mutex_unlock(&usblp->mut); 700 return retval; 701 } 702 703 static struct urb *usblp_new_writeurb(struct usblp *usblp, int transfer_length) 704 { 705 struct urb *urb; 706 char *writebuf; 707 708 writebuf = kmalloc(transfer_length, GFP_KERNEL); 709 if (writebuf == NULL) 710 return NULL; 711 urb = usb_alloc_urb(0, GFP_KERNEL); 712 if (urb == NULL) { 713 kfree(writebuf); 714 return NULL; 715 } 716 717 usb_fill_bulk_urb(urb, usblp->dev, 718 usb_sndbulkpipe(usblp->dev, 719 usblp->protocol[usblp->current_protocol].epwrite->bEndpointAddress), 720 writebuf, transfer_length, usblp_bulk_write, usblp); 721 urb->transfer_flags |= URB_FREE_BUFFER; 722 723 return urb; 724 } 725 726 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) 727 { 728 struct usblp *usblp = file->private_data; 729 struct urb *writeurb; 730 int rv; 731 int transfer_length; 732 ssize_t writecount = 0; 733 734 if (mutex_lock_interruptible(&usblp->wmut)) { 735 rv = -EINTR; 736 goto raise_biglock; 737 } 738 if ((rv = usblp_wwait(usblp, !!(file->f_flags & O_NONBLOCK))) < 0) 739 goto raise_wait; 740 741 while (writecount < count) { 742 /* 743 * Step 1: Submit next block. 744 */ 745 if ((transfer_length = count - writecount) > USBLP_BUF_SIZE) 746 transfer_length = USBLP_BUF_SIZE; 747 748 rv = -ENOMEM; 749 writeurb = usblp_new_writeurb(usblp, transfer_length); 750 if (writeurb == NULL) 751 goto raise_urb; 752 usb_anchor_urb(writeurb, &usblp->urbs); 753 754 if (copy_from_user(writeurb->transfer_buffer, 755 buffer + writecount, transfer_length)) { 756 rv = -EFAULT; 757 goto raise_badaddr; 758 } 759 760 spin_lock_irq(&usblp->lock); 761 usblp->wcomplete = 0; 762 spin_unlock_irq(&usblp->lock); 763 if ((rv = usb_submit_urb(writeurb, GFP_KERNEL)) < 0) { 764 usblp->wstatus = 0; 765 spin_lock_irq(&usblp->lock); 766 usblp->no_paper = 0; 767 usblp->wcomplete = 1; 768 wake_up(&usblp->wwait); 769 spin_unlock_irq(&usblp->lock); 770 if (rv != -ENOMEM) 771 rv = -EIO; 772 goto raise_submit; 773 } 774 775 /* 776 * Step 2: Wait for transfer to end, collect results. 777 */ 778 rv = usblp_wwait(usblp, !!(file->f_flags&O_NONBLOCK)); 779 if (rv < 0) { 780 if (rv == -EAGAIN) { 781 /* Presume that it's going to complete well. */ 782 writecount += transfer_length; 783 } 784 if (rv == -ENOSPC) { 785 spin_lock_irq(&usblp->lock); 786 usblp->no_paper = 1; /* Mark for poll(2) */ 787 spin_unlock_irq(&usblp->lock); 788 writecount += transfer_length; 789 } 790 /* Leave URB dangling, to be cleaned on close. */ 791 goto collect_error; 792 } 793 794 if (usblp->wstatus < 0) { 795 rv = -EIO; 796 goto collect_error; 797 } 798 /* 799 * This is critical: it must be our URB, not other writer's. 800 * The wmut exists mainly to cover us here. 801 */ 802 writecount += usblp->wstatus; 803 } 804 805 mutex_unlock(&usblp->wmut); 806 return writecount; 807 808 raise_submit: 809 raise_badaddr: 810 usb_unanchor_urb(writeurb); 811 usb_free_urb(writeurb); 812 raise_urb: 813 raise_wait: 814 collect_error: /* Out of raise sequence */ 815 mutex_unlock(&usblp->wmut); 816 raise_biglock: 817 return writecount ? writecount : rv; 818 } 819 820 /* 821 * Notice that we fail to restart in a few cases: on EFAULT, on restart 822 * error, etc. This is the historical behaviour. In all such cases we return 823 * EIO, and applications loop in order to get the new read going. 824 */ 825 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t len, loff_t *ppos) 826 { 827 struct usblp *usblp = file->private_data; 828 ssize_t count; 829 ssize_t avail; 830 int rv; 831 832 if (!usblp->bidir) 833 return -EINVAL; 834 835 rv = usblp_rwait_and_lock(usblp, !!(file->f_flags & O_NONBLOCK)); 836 if (rv < 0) 837 return rv; 838 839 if ((avail = usblp->rstatus) < 0) { 840 printk(KERN_ERR "usblp%d: error %d reading from printer\n", 841 usblp->minor, (int)avail); 842 usblp_submit_read(usblp); 843 count = -EIO; 844 goto done; 845 } 846 847 count = len < avail - usblp->readcount ? len : avail - usblp->readcount; 848 if (count != 0 && 849 copy_to_user(buffer, usblp->readbuf + usblp->readcount, count)) { 850 count = -EFAULT; 851 goto done; 852 } 853 854 if ((usblp->readcount += count) == avail) { 855 if (usblp_submit_read(usblp) < 0) { 856 /* We don't want to leak USB return codes into errno. */ 857 if (count == 0) 858 count = -EIO; 859 goto done; 860 } 861 } 862 863 done: 864 mutex_unlock(&usblp->mut); 865 return count; 866 } 867 868 /* 869 * Wait for the write path to come idle. 870 * This is called under the ->wmut, so the idle path stays idle. 871 * 872 * Our write path has a peculiar property: it does not buffer like a tty, 873 * but waits for the write to succeed. This allows our ->release to bug out 874 * without waiting for writes to drain. But it obviously does not work 875 * when O_NONBLOCK is set. So, applications setting O_NONBLOCK must use 876 * select(2) or poll(2) to wait for the buffer to drain before closing. 877 * Alternatively, set blocking mode with fcntl and issue a zero-size write. 878 */ 879 static int usblp_wwait(struct usblp *usblp, int nonblock) 880 { 881 DECLARE_WAITQUEUE(waita, current); 882 int rc; 883 int err = 0; 884 885 add_wait_queue(&usblp->wwait, &waita); 886 for (;;) { 887 if (mutex_lock_interruptible(&usblp->mut)) { 888 rc = -EINTR; 889 break; 890 } 891 set_current_state(TASK_INTERRUPTIBLE); 892 rc = usblp_wtest(usblp, nonblock); 893 mutex_unlock(&usblp->mut); 894 if (rc <= 0) 895 break; 896 897 if (schedule_timeout(msecs_to_jiffies(1500)) == 0) { 898 if (usblp->flags & LP_ABORT) { 899 err = usblp_check_status(usblp, err); 900 if (err == 1) { /* Paper out */ 901 rc = -ENOSPC; 902 break; 903 } 904 } else { 905 /* Prod the printer, Gentoo#251237. */ 906 mutex_lock(&usblp->mut); 907 usblp_read_status(usblp, usblp->statusbuf); 908 mutex_unlock(&usblp->mut); 909 } 910 } 911 } 912 set_current_state(TASK_RUNNING); 913 remove_wait_queue(&usblp->wwait, &waita); 914 return rc; 915 } 916 917 static int usblp_wtest(struct usblp *usblp, int nonblock) 918 { 919 unsigned long flags; 920 921 if (!usblp->present) 922 return -ENODEV; 923 if (signal_pending(current)) 924 return -EINTR; 925 spin_lock_irqsave(&usblp->lock, flags); 926 if (usblp->wcomplete) { 927 spin_unlock_irqrestore(&usblp->lock, flags); 928 return 0; 929 } 930 spin_unlock_irqrestore(&usblp->lock, flags); 931 if (nonblock) 932 return -EAGAIN; 933 return 1; 934 } 935 936 /* 937 * Wait for read bytes to become available. This probably should have been 938 * called usblp_r_lock_and_wait(), because we lock first. But it's a traditional 939 * name for functions which lock and return. 940 * 941 * We do not use wait_event_interruptible because it makes locking iffy. 942 */ 943 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock) 944 { 945 DECLARE_WAITQUEUE(waita, current); 946 int rc; 947 948 add_wait_queue(&usblp->rwait, &waita); 949 for (;;) { 950 if (mutex_lock_interruptible(&usblp->mut)) { 951 rc = -EINTR; 952 break; 953 } 954 set_current_state(TASK_INTERRUPTIBLE); 955 if ((rc = usblp_rtest(usblp, nonblock)) < 0) { 956 mutex_unlock(&usblp->mut); 957 break; 958 } 959 if (rc == 0) /* Keep it locked */ 960 break; 961 mutex_unlock(&usblp->mut); 962 schedule(); 963 } 964 set_current_state(TASK_RUNNING); 965 remove_wait_queue(&usblp->rwait, &waita); 966 return rc; 967 } 968 969 static int usblp_rtest(struct usblp *usblp, int nonblock) 970 { 971 unsigned long flags; 972 973 if (!usblp->present) 974 return -ENODEV; 975 if (signal_pending(current)) 976 return -EINTR; 977 spin_lock_irqsave(&usblp->lock, flags); 978 if (usblp->rcomplete) { 979 spin_unlock_irqrestore(&usblp->lock, flags); 980 return 0; 981 } 982 spin_unlock_irqrestore(&usblp->lock, flags); 983 if (nonblock) 984 return -EAGAIN; 985 return 1; 986 } 987 988 /* 989 * Please check ->bidir and other such things outside for now. 990 */ 991 static int usblp_submit_read(struct usblp *usblp) 992 { 993 struct urb *urb; 994 unsigned long flags; 995 int rc; 996 997 rc = -ENOMEM; 998 urb = usb_alloc_urb(0, GFP_KERNEL); 999 if (urb == NULL) 1000 goto raise_urb; 1001 1002 usb_fill_bulk_urb(urb, usblp->dev, 1003 usb_rcvbulkpipe(usblp->dev, 1004 usblp->protocol[usblp->current_protocol].epread->bEndpointAddress), 1005 usblp->readbuf, USBLP_BUF_SIZE_IN, 1006 usblp_bulk_read, usblp); 1007 usb_anchor_urb(urb, &usblp->urbs); 1008 1009 spin_lock_irqsave(&usblp->lock, flags); 1010 usblp->readcount = 0; /* XXX Why here? */ 1011 usblp->rcomplete = 0; 1012 spin_unlock_irqrestore(&usblp->lock, flags); 1013 if ((rc = usb_submit_urb(urb, GFP_KERNEL)) < 0) { 1014 dev_dbg(&usblp->intf->dev, "error submitting urb (%d)\n", rc); 1015 spin_lock_irqsave(&usblp->lock, flags); 1016 usblp->rstatus = rc; 1017 usblp->rcomplete = 1; 1018 spin_unlock_irqrestore(&usblp->lock, flags); 1019 goto raise_submit; 1020 } 1021 1022 return 0; 1023 1024 raise_submit: 1025 usb_unanchor_urb(urb); 1026 usb_free_urb(urb); 1027 raise_urb: 1028 return rc; 1029 } 1030 1031 /* 1032 * Checks for printers that have quirks, such as requiring unidirectional 1033 * communication but reporting bidirectional; currently some HP printers 1034 * have this flaw (HP 810, 880, 895, etc.), or needing an init string 1035 * sent at each open (like some Epsons). 1036 * Returns 1 if found, 0 if not found. 1037 * 1038 * HP recommended that we use the bidirectional interface but 1039 * don't attempt any bulk IN transfers from the IN endpoint. 1040 * Here's some more detail on the problem: 1041 * The problem is not that it isn't bidirectional though. The problem 1042 * is that if you request a device ID, or status information, while 1043 * the buffers are full, the return data will end up in the print data 1044 * buffer. For example if you make sure you never request the device ID 1045 * while you are sending print data, and you don't try to query the 1046 * printer status every couple of milliseconds, you will probably be OK. 1047 */ 1048 static unsigned int usblp_quirks(__u16 vendor, __u16 product) 1049 { 1050 int i; 1051 1052 for (i = 0; quirk_printers[i].vendorId; i++) { 1053 if (vendor == quirk_printers[i].vendorId && 1054 product == quirk_printers[i].productId) 1055 return quirk_printers[i].quirks; 1056 } 1057 return 0; 1058 } 1059 1060 static const struct file_operations usblp_fops = { 1061 .owner = THIS_MODULE, 1062 .read = usblp_read, 1063 .write = usblp_write, 1064 .poll = usblp_poll, 1065 .unlocked_ioctl = usblp_ioctl, 1066 .compat_ioctl = usblp_ioctl, 1067 .open = usblp_open, 1068 .release = usblp_release, 1069 .llseek = noop_llseek, 1070 }; 1071 1072 static char *usblp_devnode(struct device *dev, umode_t *mode) 1073 { 1074 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); 1075 } 1076 1077 static struct usb_class_driver usblp_class = { 1078 .name = "lp%d", 1079 .devnode = usblp_devnode, 1080 .fops = &usblp_fops, 1081 .minor_base = USBLP_MINOR_BASE, 1082 }; 1083 1084 static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf) 1085 { 1086 struct usb_interface *intf = to_usb_interface(dev); 1087 struct usblp *usblp = usb_get_intfdata(intf); 1088 1089 if (usblp->device_id_string[0] == 0 && 1090 usblp->device_id_string[1] == 0) 1091 return 0; 1092 1093 return sprintf(buf, "%s", usblp->device_id_string+2); 1094 } 1095 1096 static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL); 1097 1098 static int usblp_probe(struct usb_interface *intf, 1099 const struct usb_device_id *id) 1100 { 1101 struct usb_device *dev = interface_to_usbdev(intf); 1102 struct usblp *usblp; 1103 int protocol; 1104 int retval; 1105 1106 /* Malloc and start initializing usblp structure so we can use it 1107 * directly. */ 1108 usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL); 1109 if (!usblp) { 1110 retval = -ENOMEM; 1111 goto abort_ret; 1112 } 1113 usblp->dev = dev; 1114 mutex_init(&usblp->wmut); 1115 mutex_init(&usblp->mut); 1116 spin_lock_init(&usblp->lock); 1117 init_waitqueue_head(&usblp->rwait); 1118 init_waitqueue_head(&usblp->wwait); 1119 init_usb_anchor(&usblp->urbs); 1120 usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; 1121 usblp->intf = intf; 1122 1123 /* Malloc device ID string buffer to the largest expected length, 1124 * since we can re-query it on an ioctl and a dynamic string 1125 * could change in length. */ 1126 if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) { 1127 retval = -ENOMEM; 1128 goto abort; 1129 } 1130 1131 /* 1132 * Allocate read buffer. We somewhat wastefully 1133 * malloc both regardless of bidirectionality, because the 1134 * alternate setting can be changed later via an ioctl. 1135 */ 1136 if (!(usblp->readbuf = kmalloc(USBLP_BUF_SIZE_IN, GFP_KERNEL))) { 1137 retval = -ENOMEM; 1138 goto abort; 1139 } 1140 1141 /* Allocate buffer for printer status */ 1142 usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL); 1143 if (!usblp->statusbuf) { 1144 retval = -ENOMEM; 1145 goto abort; 1146 } 1147 1148 /* Lookup quirks for this printer. */ 1149 usblp->quirks = usblp_quirks( 1150 le16_to_cpu(dev->descriptor.idVendor), 1151 le16_to_cpu(dev->descriptor.idProduct)); 1152 1153 /* Analyze and pick initial alternate settings and endpoints. */ 1154 protocol = usblp_select_alts(usblp); 1155 if (protocol < 0) { 1156 dev_dbg(&intf->dev, 1157 "incompatible printer-class device 0x%4.4X/0x%4.4X\n", 1158 le16_to_cpu(dev->descriptor.idVendor), 1159 le16_to_cpu(dev->descriptor.idProduct)); 1160 retval = -ENODEV; 1161 goto abort; 1162 } 1163 1164 /* Setup the selected alternate setting and endpoints. */ 1165 if (usblp_set_protocol(usblp, protocol) < 0) { 1166 retval = -ENODEV; /* ->probe isn't ->ioctl */ 1167 goto abort; 1168 } 1169 1170 /* Retrieve and store the device ID string. */ 1171 usblp_cache_device_id_string(usblp); 1172 retval = device_create_file(&intf->dev, &dev_attr_ieee1284_id); 1173 if (retval) 1174 goto abort_intfdata; 1175 1176 #ifdef DEBUG 1177 usblp_check_status(usblp, 0); 1178 #endif 1179 1180 usb_set_intfdata(intf, usblp); 1181 1182 usblp->present = 1; 1183 1184 retval = usb_register_dev(intf, &usblp_class); 1185 if (retval) { 1186 dev_err(&intf->dev, 1187 "usblp: Not able to get a minor (base %u, slice default): %d\n", 1188 USBLP_MINOR_BASE, retval); 1189 goto abort_intfdata; 1190 } 1191 usblp->minor = intf->minor; 1192 dev_info(&intf->dev, 1193 "usblp%d: USB %sdirectional printer dev %d if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X\n", 1194 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum, 1195 usblp->ifnum, 1196 usblp->protocol[usblp->current_protocol].alt_setting, 1197 usblp->current_protocol, 1198 le16_to_cpu(usblp->dev->descriptor.idVendor), 1199 le16_to_cpu(usblp->dev->descriptor.idProduct)); 1200 1201 return 0; 1202 1203 abort_intfdata: 1204 usb_set_intfdata(intf, NULL); 1205 device_remove_file(&intf->dev, &dev_attr_ieee1284_id); 1206 abort: 1207 kfree(usblp->readbuf); 1208 kfree(usblp->statusbuf); 1209 kfree(usblp->device_id_string); 1210 kfree(usblp); 1211 abort_ret: 1212 return retval; 1213 } 1214 1215 /* 1216 * We are a "new" style driver with usb_device_id table, 1217 * but our requirements are too intricate for simple match to handle. 1218 * 1219 * The "proto_bias" option may be used to specify the preferred protocol 1220 * for all USB printers (1=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2, 1221 * 3=USB_CLASS_PRINTER/1/3). If the device supports the preferred protocol, 1222 * then we bind to it. 1223 * 1224 * The best interface for us is USB_CLASS_PRINTER/1/2, because it 1225 * is compatible with a stream of characters. If we find it, we bind to it. 1226 * 1227 * Note that the people from hpoj.sourceforge.net need to be able to 1228 * bind to USB_CLASS_PRINTER/1/3 (MLC/1284.4), so we provide them ioctls 1229 * for this purpose. 1230 * 1231 * Failing USB_CLASS_PRINTER/1/2, we look for USB_CLASS_PRINTER/1/3, 1232 * even though it's probably not stream-compatible, because this matches 1233 * the behaviour of the old code. 1234 * 1235 * If nothing else, we bind to USB_CLASS_PRINTER/1/1 1236 * - the unidirectional interface. 1237 */ 1238 static int usblp_select_alts(struct usblp *usblp) 1239 { 1240 struct usb_interface *if_alt; 1241 struct usb_host_interface *ifd; 1242 struct usb_endpoint_descriptor *epwrite, *epread; 1243 int p, i; 1244 int res; 1245 1246 if_alt = usblp->intf; 1247 1248 for (p = 0; p < USBLP_MAX_PROTOCOLS; p++) 1249 usblp->protocol[p].alt_setting = -1; 1250 1251 /* Find out what we have. */ 1252 for (i = 0; i < if_alt->num_altsetting; i++) { 1253 ifd = &if_alt->altsetting[i]; 1254 1255 if (ifd->desc.bInterfaceClass != USB_CLASS_PRINTER || 1256 ifd->desc.bInterfaceSubClass != 1) 1257 if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS)) 1258 continue; 1259 1260 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL || 1261 ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL) 1262 continue; 1263 1264 /* Look for the expected bulk endpoints. */ 1265 if (ifd->desc.bInterfaceProtocol > 1) { 1266 res = usb_find_common_endpoints(ifd, 1267 &epread, &epwrite, NULL, NULL); 1268 } else { 1269 epread = NULL; 1270 res = usb_find_bulk_out_endpoint(ifd, &epwrite); 1271 } 1272 1273 /* Ignore buggy hardware without the right endpoints. */ 1274 if (res) 1275 continue; 1276 1277 /* Turn off reads for buggy bidirectional printers. */ 1278 if (usblp->quirks & USBLP_QUIRK_BIDIR) { 1279 printk(KERN_INFO "usblp%d: Disabling reads from " 1280 "problematic bidirectional printer\n", 1281 usblp->minor); 1282 epread = NULL; 1283 } 1284 1285 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting = 1286 ifd->desc.bAlternateSetting; 1287 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite; 1288 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread; 1289 } 1290 1291 /* If our requested protocol is supported, then use it. */ 1292 if (proto_bias >= USBLP_FIRST_PROTOCOL && 1293 proto_bias <= USBLP_LAST_PROTOCOL && 1294 usblp->protocol[proto_bias].alt_setting != -1) 1295 return proto_bias; 1296 1297 /* Ordering is important here. */ 1298 if (usblp->protocol[2].alt_setting != -1) 1299 return 2; 1300 if (usblp->protocol[1].alt_setting != -1) 1301 return 1; 1302 if (usblp->protocol[3].alt_setting != -1) 1303 return 3; 1304 1305 /* If nothing is available, then don't bind to this device. */ 1306 return -1; 1307 } 1308 1309 static int usblp_set_protocol(struct usblp *usblp, int protocol) 1310 { 1311 int r, alts; 1312 1313 if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL) 1314 return -EINVAL; 1315 1316 alts = usblp->protocol[protocol].alt_setting; 1317 if (alts < 0) 1318 return -EINVAL; 1319 r = usb_set_interface(usblp->dev, usblp->ifnum, alts); 1320 if (r < 0) { 1321 printk(KERN_ERR "usblp: can't set desired altsetting %d on interface %d\n", 1322 alts, usblp->ifnum); 1323 return r; 1324 } 1325 1326 usblp->bidir = (usblp->protocol[protocol].epread != NULL); 1327 usblp->current_protocol = protocol; 1328 dev_dbg(&usblp->intf->dev, "usblp%d set protocol %d\n", 1329 usblp->minor, protocol); 1330 return 0; 1331 } 1332 1333 /* Retrieves and caches device ID string. 1334 * Returns length, including length bytes but not null terminator. 1335 * On error, returns a negative errno value. */ 1336 static int usblp_cache_device_id_string(struct usblp *usblp) 1337 { 1338 int err, length; 1339 1340 err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1); 1341 if (err < 0) { 1342 dev_dbg(&usblp->intf->dev, 1343 "usblp%d: error = %d reading IEEE-1284 Device ID string\n", 1344 usblp->minor, err); 1345 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0'; 1346 return -EIO; 1347 } 1348 1349 /* First two bytes are length in big-endian. 1350 * They count themselves, and we copy them into 1351 * the user's buffer. */ 1352 length = be16_to_cpu(*((__be16 *)usblp->device_id_string)); 1353 if (length < 2) 1354 length = 2; 1355 else if (length >= USBLP_DEVICE_ID_SIZE) 1356 length = USBLP_DEVICE_ID_SIZE - 1; 1357 usblp->device_id_string[length] = '\0'; 1358 1359 dev_dbg(&usblp->intf->dev, "usblp%d Device ID string [len=%d]=\"%s\"\n", 1360 usblp->minor, length, &usblp->device_id_string[2]); 1361 1362 return length; 1363 } 1364 1365 static void usblp_disconnect(struct usb_interface *intf) 1366 { 1367 struct usblp *usblp = usb_get_intfdata(intf); 1368 1369 usb_deregister_dev(intf, &usblp_class); 1370 1371 if (!usblp || !usblp->dev) { 1372 dev_err(&intf->dev, "bogus disconnect\n"); 1373 BUG(); 1374 } 1375 1376 device_remove_file(&intf->dev, &dev_attr_ieee1284_id); 1377 1378 mutex_lock(&usblp_mutex); 1379 mutex_lock(&usblp->mut); 1380 usblp->present = 0; 1381 wake_up(&usblp->wwait); 1382 wake_up(&usblp->rwait); 1383 usb_set_intfdata(intf, NULL); 1384 1385 usblp_unlink_urbs(usblp); 1386 mutex_unlock(&usblp->mut); 1387 1388 if (!usblp->used) 1389 usblp_cleanup(usblp); 1390 mutex_unlock(&usblp_mutex); 1391 } 1392 1393 static int usblp_suspend(struct usb_interface *intf, pm_message_t message) 1394 { 1395 struct usblp *usblp = usb_get_intfdata(intf); 1396 1397 usblp_unlink_urbs(usblp); 1398 #if 0 /* XXX Do we want this? What if someone is reading, should we fail? */ 1399 /* not strictly necessary, but just in case */ 1400 wake_up(&usblp->wwait); 1401 wake_up(&usblp->rwait); 1402 #endif 1403 1404 return 0; 1405 } 1406 1407 static int usblp_resume(struct usb_interface *intf) 1408 { 1409 struct usblp *usblp = usb_get_intfdata(intf); 1410 int r; 1411 1412 r = handle_bidir(usblp); 1413 1414 return r; 1415 } 1416 1417 static const struct usb_device_id usblp_ids[] = { 1418 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 1) }, 1419 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 2) }, 1420 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 3) }, 1421 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 1) }, 1422 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 2) }, 1423 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 3) }, 1424 { USB_DEVICE(0x04b8, 0x0202) }, /* Seiko Epson Receipt Printer M129C */ 1425 { } /* Terminating entry */ 1426 }; 1427 1428 MODULE_DEVICE_TABLE(usb, usblp_ids); 1429 1430 static struct usb_driver usblp_driver = { 1431 .name = "usblp", 1432 .probe = usblp_probe, 1433 .disconnect = usblp_disconnect, 1434 .suspend = usblp_suspend, 1435 .resume = usblp_resume, 1436 .id_table = usblp_ids, 1437 .supports_autosuspend = 1, 1438 }; 1439 1440 module_usb_driver(usblp_driver); 1441 1442 MODULE_AUTHOR(DRIVER_AUTHOR); 1443 MODULE_DESCRIPTION(DRIVER_DESC); 1444 module_param(proto_bias, int, S_IRUGO | S_IWUSR); 1445 MODULE_PARM_DESC(proto_bias, "Favourite protocol number"); 1446 MODULE_LICENSE("GPL"); 1447