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usblp: Don't let suspend to kill ->used
[linux-2.6/verdex.git] / drivers / usb / class / usblp.c
blob6778f9af794381ec0ae40df7253aa26f0bbddfbc
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/signal.h>
53 #include <linux/poll.h>
54 #include <linux/init.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
61 /*
62 * Version Information
63 */
64 #define DRIVER_VERSION "v0.13"
65 #define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal"
66 #define DRIVER_DESC "USB Printer Device Class driver"
67
68 #define USBLP_BUF_SIZE 8192
69 #define USBLP_DEVICE_ID_SIZE 1024
70
71 /* ioctls: */
72 #define LPGETSTATUS 0x060b /* same as in drivers/char/lp.c */
73 #define IOCNR_GET_DEVICE_ID 1
74 #define IOCNR_GET_PROTOCOLS 2
75 #define IOCNR_SET_PROTOCOL 3
76 #define IOCNR_HP_SET_CHANNEL 4
77 #define IOCNR_GET_BUS_ADDRESS 5
78 #define IOCNR_GET_VID_PID 6
79 #define IOCNR_SOFT_RESET 7
80 /* Get device_id string: */
81 #define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len)
82 /* The following ioctls were added for http://hpoj.sourceforge.net: */
83 /* Get two-int array:
84 * [0]=current protocol (1=7/1/1, 2=7/1/2, 3=7/1/3),
85 * [1]=supported protocol mask (mask&(1<<n)!=0 means 7/1/n supported): */
86 #define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
87 /* Set protocol (arg: 1=7/1/1, 2=7/1/2, 3=7/1/3): */
88 #define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0)
89 /* Set channel number (HP Vendor-specific command): */
90 #define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0)
91 /* Get two-int array: [0]=bus number, [1]=device address: */
92 #define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len)
93 /* Get two-int array: [0]=vendor ID, [1]=product ID: */
94 #define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len)
95 /* Perform class specific soft reset */
96 #define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0);
97
98 /*
99 * A DEVICE_ID string may include the printer's serial number.
100 * It should end with a semi-colon (';').
101 * An example from an HP 970C DeskJet printer is (this is one long string,
102 * with the serial number changed):
103 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: ;
104 */
105
106 /*
107 * USB Printer Requests
108 */
109
110 #define USBLP_REQ_GET_ID 0x00
111 #define USBLP_REQ_GET_STATUS 0x01
112 #define USBLP_REQ_RESET 0x02
113 #define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST 0x00 /* HP Vendor-specific */
114
115 #define USBLP_MINORS 16
116 #define USBLP_MINOR_BASE 0
117
118 #define USBLP_WRITE_TIMEOUT (5000) /* 5 seconds */
119
120 #define USBLP_FIRST_PROTOCOL 1
121 #define USBLP_LAST_PROTOCOL 3
122 #define USBLP_MAX_PROTOCOLS (USBLP_LAST_PROTOCOL+1)
123
124 /*
125 * some arbitrary status buffer size;
126 * need a status buffer that is allocated via kmalloc(), not on stack
127 */
128 #define STATUS_BUF_SIZE 8
129
130 struct usblp {
131 struct usb_device *dev; /* USB device */
132 struct mutex mut; /* locks this struct, especially "dev" */
133 char *writebuf; /* write transfer_buffer */
134 char *readbuf; /* read transfer_buffer */
135 char *statusbuf; /* status transfer_buffer */
136 struct urb *readurb, *writeurb; /* The urbs */
137 wait_queue_head_t wait; /* Zzzzz ... */
138 int readcount; /* Counter for reads */
139 int ifnum; /* Interface number */
140 struct usb_interface *intf; /* The interface */
141 /* Alternate-setting numbers and endpoints for each protocol
142 * (7/1/{index=1,2,3}) that the device supports: */
143 struct {
144 int alt_setting;
145 struct usb_endpoint_descriptor *epwrite;
146 struct usb_endpoint_descriptor *epread;
147 } protocol[USBLP_MAX_PROTOCOLS];
148 int current_protocol;
149 int minor; /* minor number of device */
150 int wcomplete; /* writing is completed */
151 int rcomplete; /* reading is completed */
152 unsigned int quirks; /* quirks flags */
153 unsigned char used; /* True if open */
154 unsigned char present; /* True if not disconnected */
155 unsigned char bidir; /* interface is bidirectional */
156 unsigned char sleeping; /* interface is suspended */
157 unsigned char *device_id_string; /* IEEE 1284 DEVICE ID string (ptr) */
158 /* first 2 bytes are (big-endian) length */
159 };
160
161 #ifdef DEBUG
162 static void usblp_dump(struct usblp *usblp) {
163 int p;
164
165 dbg("usblp=0x%p", usblp);
166 dbg("dev=0x%p", usblp->dev);
167 dbg("present=%d", usblp->present);
168 dbg("readbuf=0x%p", usblp->readbuf);
169 dbg("writebuf=0x%p", usblp->writebuf);
170 dbg("readurb=0x%p", usblp->readurb);
171 dbg("writeurb=0x%p", usblp->writeurb);
172 dbg("readcount=%d", usblp->readcount);
173 dbg("ifnum=%d", usblp->ifnum);
174 for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
175 dbg("protocol[%d].alt_setting=%d", p, usblp->protocol[p].alt_setting);
176 dbg("protocol[%d].epwrite=%p", p, usblp->protocol[p].epwrite);
177 dbg("protocol[%d].epread=%p", p, usblp->protocol[p].epread);
178 }
179 dbg("current_protocol=%d", usblp->current_protocol);
180 dbg("minor=%d", usblp->minor);
181 dbg("wcomplete=%d", usblp->wcomplete);
182 dbg("rcomplete=%d", usblp->rcomplete);
183 dbg("quirks=%d", usblp->quirks);
184 dbg("used=%d", usblp->used);
185 dbg("bidir=%d", usblp->bidir);
186 dbg("sleeping=%d", usblp->sleeping);
187 dbg("device_id_string=\"%s\"",
188 usblp->device_id_string ?
189 usblp->device_id_string + 2 :
190 (unsigned char *)"(null)");
191 }
192 #endif
193
194 /* Quirks: various printer quirks are handled by this table & its flags. */
195
196 struct quirk_printer_struct {
197 __u16 vendorId;
198 __u16 productId;
199 unsigned int quirks;
200 };
201
202 #define USBLP_QUIRK_BIDIR 0x1 /* reports bidir but requires unidirectional mode (no INs/reads) */
203 #define USBLP_QUIRK_USB_INIT 0x2 /* needs vendor USB init string */
204 #define USBLP_QUIRK_BAD_CLASS 0x4 /* descriptor uses vendor-specific Class or SubClass */
205
206 static const struct quirk_printer_struct quirk_printers[] = {
207 { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
208 { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
209 { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
210 { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
211 { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
212 { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
213 { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */
214 { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */
215 { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
216 { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
217 { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
218 { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
219 { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
220 { 0x0482, 0x0010, USBLP_QUIRK_BIDIR }, /* Kyocera Mita FS 820, by zut <kernel@zut.de> */
221 { 0x04b8, 0x0202, USBLP_QUIRK_BAD_CLASS }, /* Seiko Epson Receipt Printer M129C */
222 { 0, 0 }
223 };
224
225 static int usblp_select_alts(struct usblp *usblp);
226 static int usblp_set_protocol(struct usblp *usblp, int protocol);
227 static int usblp_cache_device_id_string(struct usblp *usblp);
228
229 /* forward reference to make our lives easier */
230 static struct usb_driver usblp_driver;
231 static DEFINE_MUTEX(usblp_mutex); /* locks the existence of usblp's */
232
233 /*
234 * Functions for usblp control messages.
235 */
236
237 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
238 {
239 int retval;
240 int index = usblp->ifnum;
241
242 /* High byte has the interface index.
243 Low byte has the alternate setting.
244 */
245 if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) {
246 index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
247 }
248
249 retval = usb_control_msg(usblp->dev,
250 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
251 request, type | dir | recip, value, index, buf, len, USBLP_WRITE_TIMEOUT);
252 dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d",
253 request, !!dir, recip, value, index, len, retval);
254 return retval < 0 ? retval : 0;
255 }
256
257 #define usblp_read_status(usblp, status)\
258 usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
259 #define usblp_get_id(usblp, config, id, maxlen)\
260 usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
261 #define usblp_reset(usblp)\
262 usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
263
264 #define usblp_hp_channel_change_request(usblp, channel, buffer) \
265 usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
266
267 /*
268 * See the description for usblp_select_alts() below for the usage
269 * explanation. Look into your /proc/bus/usb/devices and dmesg in
270 * case of any trouble.
271 */
272 static int proto_bias = -1;
273
274 /*
275 * URB callback.
276 */
277
278 static void usblp_bulk_read(struct urb *urb)
279 {
280 struct usblp *usblp = urb->context;
281
282 if (unlikely(!usblp || !usblp->dev || !usblp->used))
283 return;
284
285 if (unlikely(!usblp->present))
286 goto unplug;
287 if (unlikely(urb->status))
288 warn("usblp%d: nonzero read/write bulk status received: %d",
289 usblp->minor, urb->status);
290 usblp->rcomplete = 1;
291 unplug:
292 wake_up_interruptible(&usblp->wait);
293 }
294
295 static void usblp_bulk_write(struct urb *urb)
296 {
297 struct usblp *usblp = urb->context;
298
299 if (unlikely(!usblp || !usblp->dev || !usblp->used))
300 return;
301 if (unlikely(!usblp->present))
302 goto unplug;
303 if (unlikely(urb->status))
304 warn("usblp%d: nonzero read/write bulk status received: %d",
305 usblp->minor, urb->status);
306 usblp->wcomplete = 1;
307 unplug:
308 wake_up_interruptible(&usblp->wait);
309 }
310
311 /*
312 * Get and print printer errors.
313 */
314
315 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
316
317 static int usblp_check_status(struct usblp *usblp, int err)
318 {
319 unsigned char status, newerr = 0;
320 int error;
321
322 error = usblp_read_status (usblp, usblp->statusbuf);
323 if (error < 0) {
324 if (printk_ratelimit())
325 err("usblp%d: error %d reading printer status",
326 usblp->minor, error);
327 return 0;
328 }
329
330 status = *usblp->statusbuf;
331
332 if (~status & LP_PERRORP)
333 newerr = 3;
334 if (status & LP_POUTPA)
335 newerr = 1;
336 if (~status & LP_PSELECD)
337 newerr = 2;
338
339 if (newerr != err)
340 info("usblp%d: %s", usblp->minor, usblp_messages[newerr]);
341
342 return newerr;
343 }
344
345 static int handle_bidir (struct usblp *usblp)
346 {
347 if (usblp->bidir && usblp->used && !usblp->sleeping) {
348 usblp->readcount = 0;
349 usblp->readurb->dev = usblp->dev;
350 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0)
351 return -EIO;
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 retval = usb_autopm_get_interface(intf);
401 if (retval < 0)
402 goto out;
403 usblp->used = 1;
404 file->private_data = usblp;
405
406 usblp->writeurb->transfer_buffer_length = 0;
407 usblp->wcomplete = 1; /* we begin writeable */
408 usblp->rcomplete = 0;
409 usblp->writeurb->status = 0;
410 usblp->readurb->status = 0;
411
412 if (handle_bidir(usblp) < 0) {
413 usblp->used = 0;
414 file->private_data = NULL;
415 retval = -EIO;
416 }
417 out:
418 mutex_unlock (&usblp_mutex);
419 return retval;
420 }
421
422 static void usblp_cleanup (struct usblp *usblp)
423 {
424 info("usblp%d: removed", usblp->minor);
425
426 kfree (usblp->device_id_string);
427 kfree (usblp->statusbuf);
428 usb_free_urb(usblp->writeurb);
429 usb_free_urb(usblp->readurb);
430 kfree (usblp);
431 }
432
433 static void usblp_unlink_urbs(struct usblp *usblp)
434 {
435 usb_kill_urb(usblp->writeurb);
436 if (usblp->bidir)
437 usb_kill_urb(usblp->readurb);
438 }
439
440 static int usblp_release(struct inode *inode, struct file *file)
441 {
442 struct usblp *usblp = file->private_data;
443
444 mutex_lock (&usblp_mutex);
445 usblp->used = 0;
446 if (usblp->present) {
447 usblp_unlink_urbs(usblp);
448 usb_autopm_put_interface(usblp->intf);
449 } else /* finish cleanup from disconnect */
450 usblp_cleanup (usblp);
451 mutex_unlock (&usblp_mutex);
452 return 0;
453 }
454
455 /* No kernel lock - fine */
456 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
457 {
458 struct usblp *usblp = file->private_data;
459 poll_wait(file, &usblp->wait, wait);
460 return ((!usblp->bidir || !usblp->rcomplete) ? 0 : POLLIN | POLLRDNORM)
461 | (!usblp->wcomplete ? 0 : POLLOUT | POLLWRNORM);
462 }
463
464 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
465 {
466 struct usblp *usblp = file->private_data;
467 int length, err, i;
468 unsigned char newChannel;
469 int status;
470 int twoints[2];
471 int retval = 0;
472
473 mutex_lock (&usblp->mut);
474 if (!usblp->present) {
475 retval = -ENODEV;
476 goto done;
477 }
478
479 if (usblp->sleeping) {
480 retval = -ENODEV;
481 goto done;
482 }
483
484 dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd),
485 _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd) );
486
487 if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */
488
489 switch (_IOC_NR(cmd)) {
490
491 case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
492 if (_IOC_DIR(cmd) != _IOC_READ) {
493 retval = -EINVAL;
494 goto done;
495 }
496
497 length = usblp_cache_device_id_string(usblp);
498 if (length < 0) {
499 retval = length;
500 goto done;
501 }
502 if (length > _IOC_SIZE(cmd))
503 length = _IOC_SIZE(cmd); /* truncate */
504
505 if (copy_to_user((void __user *) arg,
506 usblp->device_id_string,
507 (unsigned long) length)) {
508 retval = -EFAULT;
509 goto done;
510 }
511
512 break;
513
514 case IOCNR_GET_PROTOCOLS:
515 if (_IOC_DIR(cmd) != _IOC_READ ||
516 _IOC_SIZE(cmd) < sizeof(twoints)) {
517 retval = -EINVAL;
518 goto done;
519 }
520
521 twoints[0] = usblp->current_protocol;
522 twoints[1] = 0;
523 for (i = USBLP_FIRST_PROTOCOL;
524 i <= USBLP_LAST_PROTOCOL; i++) {
525 if (usblp->protocol[i].alt_setting >= 0)
526 twoints[1] |= (1<<i);
527 }
528
529 if (copy_to_user((void __user *)arg,
530 (unsigned char *)twoints,
531 sizeof(twoints))) {
532 retval = -EFAULT;
533 goto done;
534 }
535
536 break;
537
538 case IOCNR_SET_PROTOCOL:
539 if (_IOC_DIR(cmd) != _IOC_WRITE) {
540 retval = -EINVAL;
541 goto done;
542 }
543
544 #ifdef DEBUG
545 if (arg == -10) {
546 usblp_dump(usblp);
547 break;
548 }
549 #endif
550
551 usblp_unlink_urbs(usblp);
552 retval = usblp_set_protocol(usblp, arg);
553 if (retval < 0) {
554 usblp_set_protocol(usblp,
555 usblp->current_protocol);
556 }
557 break;
558
559 case IOCNR_HP_SET_CHANNEL:
560 if (_IOC_DIR(cmd) != _IOC_WRITE ||
561 le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
562 usblp->quirks & USBLP_QUIRK_BIDIR) {
563 retval = -EINVAL;
564 goto done;
565 }
566
567 err = usblp_hp_channel_change_request(usblp,
568 arg, &newChannel);
569 if (err < 0) {
570 err("usblp%d: error = %d setting "
571 "HP channel",
572 usblp->minor, err);
573 retval = -EIO;
574 goto done;
575 }
576
577 dbg("usblp%d requested/got HP channel %ld/%d",
578 usblp->minor, arg, newChannel);
579 break;
580
581 case IOCNR_GET_BUS_ADDRESS:
582 if (_IOC_DIR(cmd) != _IOC_READ ||
583 _IOC_SIZE(cmd) < sizeof(twoints)) {
584 retval = -EINVAL;
585 goto done;
586 }
587
588 twoints[0] = usblp->dev->bus->busnum;
589 twoints[1] = usblp->dev->devnum;
590 if (copy_to_user((void __user *)arg,
591 (unsigned char *)twoints,
592 sizeof(twoints))) {
593 retval = -EFAULT;
594 goto done;
595 }
596
597 dbg("usblp%d is bus=%d, device=%d",
598 usblp->minor, twoints[0], twoints[1]);
599 break;
600
601 case IOCNR_GET_VID_PID:
602 if (_IOC_DIR(cmd) != _IOC_READ ||
603 _IOC_SIZE(cmd) < sizeof(twoints)) {
604 retval = -EINVAL;
605 goto done;
606 }
607
608 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
609 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
610 if (copy_to_user((void __user *)arg,
611 (unsigned char *)twoints,
612 sizeof(twoints))) {
613 retval = -EFAULT;
614 goto done;
615 }
616
617 dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X",
618 usblp->minor, twoints[0], twoints[1]);
619 break;
620
621 case IOCNR_SOFT_RESET:
622 if (_IOC_DIR(cmd) != _IOC_NONE) {
623 retval = -EINVAL;
624 goto done;
625 }
626 retval = usblp_reset(usblp);
627 break;
628 default:
629 retval = -ENOTTY;
630 }
631 else /* old-style ioctl value */
632 switch (cmd) {
633
634 case LPGETSTATUS:
635 if (usblp_read_status(usblp, usblp->statusbuf)) {
636 if (printk_ratelimit())
637 err("usblp%d: failed reading printer status",
638 usblp->minor);
639 retval = -EIO;
640 goto done;
641 }
642 status = *usblp->statusbuf;
643 if (copy_to_user ((void __user *)arg, &status, sizeof(int)))
644 retval = -EFAULT;
645 break;
646
647 default:
648 retval = -ENOTTY;
649 }
650
651 done:
652 mutex_unlock (&usblp->mut);
653 return retval;
654 }
655
656 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
657 {
658 struct usblp *usblp = file->private_data;
659 int timeout, intr, rv, err = 0, transfer_length = 0;
660 size_t writecount = 0;
661
662 while (writecount < count) {
663 if (!usblp->wcomplete) {
664 barrier();
665 if (file->f_flags & O_NONBLOCK) {
666 writecount += transfer_length;
667 return writecount ? writecount : -EAGAIN;
668 }
669
670 timeout = USBLP_WRITE_TIMEOUT;
671
672 rv = wait_event_interruptible_timeout(usblp->wait, usblp->wcomplete || !usblp->present , timeout);
673 if (rv < 0)
674 return writecount ? writecount : -EINTR;
675 }
676 intr = mutex_lock_interruptible (&usblp->mut);
677 if (intr)
678 return writecount ? writecount : -EINTR;
679 if (!usblp->present) {
680 mutex_unlock (&usblp->mut);
681 return -ENODEV;
682 }
683
684 if (usblp->sleeping) {
685 mutex_unlock (&usblp->mut);
686 return writecount ? writecount : -ENODEV;
687 }
688
689 if (usblp->writeurb->status != 0) {
690 if (usblp->quirks & USBLP_QUIRK_BIDIR) {
691 if (!usblp->wcomplete)
692 err("usblp%d: error %d writing to printer",
693 usblp->minor, usblp->writeurb->status);
694 err = usblp->writeurb->status;
695 } else
696 err = usblp_check_status(usblp, err);
697 mutex_unlock (&usblp->mut);
698
699 /* if the fault was due to disconnect, let khubd's
700 * call to usblp_disconnect() grab usblp->mut ...
701 */
702 schedule ();
703 continue;
704 }
705
706 /* We must increment writecount here, and not at the
707 * end of the loop. Otherwise, the final loop iteration may
708 * be skipped, leading to incomplete printer output.
709 */
710 writecount += transfer_length;
711 if (writecount == count) {
712 mutex_unlock(&usblp->mut);
713 break;
714 }
715
716 transfer_length=(count - writecount);
717 if (transfer_length > USBLP_BUF_SIZE)
718 transfer_length = USBLP_BUF_SIZE;
719
720 usblp->writeurb->transfer_buffer_length = transfer_length;
721
722 if (copy_from_user(usblp->writeurb->transfer_buffer,
723 buffer + writecount, transfer_length)) {
724 mutex_unlock(&usblp->mut);
725 return writecount ? writecount : -EFAULT;
726 }
727
728 usblp->writeurb->dev = usblp->dev;
729 usblp->wcomplete = 0;
730 err = usb_submit_urb(usblp->writeurb, GFP_KERNEL);
731 if (err) {
732 usblp->wcomplete = 1;
733 if (err != -ENOMEM)
734 count = -EIO;
735 else
736 count = writecount ? writecount : -ENOMEM;
737 mutex_unlock (&usblp->mut);
738 break;
739 }
740 mutex_unlock (&usblp->mut);
741 }
742
743 return count;
744 }
745
746 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
747 {
748 struct usblp *usblp = file->private_data;
749 int rv, intr;
750
751 if (!usblp->bidir)
752 return -EINVAL;
753
754 intr = mutex_lock_interruptible (&usblp->mut);
755 if (intr)
756 return -EINTR;
757 if (!usblp->present) {
758 count = -ENODEV;
759 goto done;
760 }
761
762 if (!usblp->rcomplete) {
763 barrier();
764
765 if (file->f_flags & O_NONBLOCK) {
766 count = -EAGAIN;
767 goto done;
768 }
769 mutex_unlock(&usblp->mut);
770 rv = wait_event_interruptible(usblp->wait, usblp->rcomplete || !usblp->present);
771 mutex_lock(&usblp->mut);
772 if (rv < 0) {
773 count = -EINTR;
774 goto done;
775 }
776 }
777
778 if (!usblp->present) {
779 count = -ENODEV;
780 goto done;
781 }
782
783 if (usblp->sleeping) {
784 count = -ENODEV;
785 goto done;
786 }
787
788 if (usblp->readurb->status) {
789 err("usblp%d: error %d reading from printer",
790 usblp->minor, usblp->readurb->status);
791 usblp->readurb->dev = usblp->dev;
792 usblp->readcount = 0;
793 usblp->rcomplete = 0;
794 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0)
795 dbg("error submitting urb");
796 count = -EIO;
797 goto done;
798 }
799
800 count = count < usblp->readurb->actual_length - usblp->readcount ?
801 count : usblp->readurb->actual_length - usblp->readcount;
802
803 if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) {
804 count = -EFAULT;
805 goto done;
806 }
807
808 if ((usblp->readcount += count) == usblp->readurb->actual_length) {
809 usblp->readcount = 0;
810 usblp->readurb->dev = usblp->dev;
811 usblp->rcomplete = 0;
812 if (usb_submit_urb(usblp->readurb, GFP_KERNEL)) {
813 count = -EIO;
814 goto done;
815 }
816 }
817
818 done:
819 mutex_unlock (&usblp->mut);
820 return count;
821 }
822
823 /*
824 * Checks for printers that have quirks, such as requiring unidirectional
825 * communication but reporting bidirectional; currently some HP printers
826 * have this flaw (HP 810, 880, 895, etc.), or needing an init string
827 * sent at each open (like some Epsons).
828 * Returns 1 if found, 0 if not found.
829 *
830 * HP recommended that we use the bidirectional interface but
831 * don't attempt any bulk IN transfers from the IN endpoint.
832 * Here's some more detail on the problem:
833 * The problem is not that it isn't bidirectional though. The problem
834 * is that if you request a device ID, or status information, while
835 * the buffers are full, the return data will end up in the print data
836 * buffer. For example if you make sure you never request the device ID
837 * while you are sending print data, and you don't try to query the
838 * printer status every couple of milliseconds, you will probably be OK.
839 */
840 static unsigned int usblp_quirks (__u16 vendor, __u16 product)
841 {
842 int i;
843
844 for (i = 0; quirk_printers[i].vendorId; i++) {
845 if (vendor == quirk_printers[i].vendorId &&
846 product == quirk_printers[i].productId)
847 return quirk_printers[i].quirks;
848 }
849 return 0;
850 }
851
852 static const struct file_operations usblp_fops = {
853 .owner = THIS_MODULE,
854 .read = usblp_read,
855 .write = usblp_write,
856 .poll = usblp_poll,
857 .unlocked_ioctl = usblp_ioctl,
858 .compat_ioctl = usblp_ioctl,
859 .open = usblp_open,
860 .release = usblp_release,
861 };
862
863 static struct usb_class_driver usblp_class = {
864 .name = "lp%d",
865 .fops = &usblp_fops,
866 .minor_base = USBLP_MINOR_BASE,
867 };
868
869 static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf)
870 {
871 struct usb_interface *intf = to_usb_interface(dev);
872 struct usblp *usblp = usb_get_intfdata (intf);
873
874 if (usblp->device_id_string[0] == 0 &&
875 usblp->device_id_string[1] == 0)
876 return 0;
877
878 return sprintf(buf, "%s", usblp->device_id_string+2);
879 }
880
881 static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL);
882
883 static int usblp_probe(struct usb_interface *intf,
884 const struct usb_device_id *id)
885 {
886 struct usb_device *dev = interface_to_usbdev (intf);
887 struct usblp *usblp = NULL;
888 int protocol;
889 int retval;
890
891 /* Malloc and start initializing usblp structure so we can use it
892 * directly. */
893 if (!(usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL))) {
894 err("out of memory for usblp");
895 goto abort;
896 }
897 usblp->dev = dev;
898 mutex_init (&usblp->mut);
899 init_waitqueue_head(&usblp->wait);
900 usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
901 usblp->intf = intf;
902
903 usblp->writeurb = usb_alloc_urb(0, GFP_KERNEL);
904 if (!usblp->writeurb) {
905 err("out of memory");
906 goto abort;
907 }
908 usblp->readurb = usb_alloc_urb(0, GFP_KERNEL);
909 if (!usblp->readurb) {
910 err("out of memory");
911 goto abort;
912 }
913
914 /* Malloc device ID string buffer to the largest expected length,
915 * since we can re-query it on an ioctl and a dynamic string
916 * could change in length. */
917 if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
918 err("out of memory for device_id_string");
919 goto abort;
920 }
921
922 usblp->writebuf = usblp->readbuf = NULL;
923 usblp->writeurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
924 usblp->readurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
925 /* Malloc write & read buffers. We somewhat wastefully
926 * malloc both regardless of bidirectionality, because the
927 * alternate setting can be changed later via an ioctl. */
928 if (!(usblp->writebuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
929 GFP_KERNEL, &usblp->writeurb->transfer_dma))) {
930 err("out of memory for write buf");
931 goto abort;
932 }
933 if (!(usblp->readbuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
934 GFP_KERNEL, &usblp->readurb->transfer_dma))) {
935 err("out of memory for read buf");
936 goto abort;
937 }
938
939 /* Allocate buffer for printer status */
940 usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
941 if (!usblp->statusbuf) {
942 err("out of memory for statusbuf");
943 goto abort;
944 }
945
946 /* Lookup quirks for this printer. */
947 usblp->quirks = usblp_quirks(
948 le16_to_cpu(dev->descriptor.idVendor),
949 le16_to_cpu(dev->descriptor.idProduct));
950
951 /* Analyze and pick initial alternate settings and endpoints. */
952 protocol = usblp_select_alts(usblp);
953 if (protocol < 0) {
954 dbg("incompatible printer-class device 0x%4.4X/0x%4.4X",
955 le16_to_cpu(dev->descriptor.idVendor),
956 le16_to_cpu(dev->descriptor.idProduct));
957 goto abort;
958 }
959
960 /* Setup the selected alternate setting and endpoints. */
961 if (usblp_set_protocol(usblp, protocol) < 0)
962 goto abort;
963
964 /* Retrieve and store the device ID string. */
965 usblp_cache_device_id_string(usblp);
966 retval = device_create_file(&intf->dev, &dev_attr_ieee1284_id);
967 if (retval)
968 goto abort_intfdata;
969
970 #ifdef DEBUG
971 usblp_check_status(usblp, 0);
972 #endif
973
974 usb_set_intfdata (intf, usblp);
975
976 usblp->present = 1;
977
978 retval = usb_register_dev(intf, &usblp_class);
979 if (retval) {
980 err("Not able to get a minor for this device.");
981 goto abort_intfdata;
982 }
983 usblp->minor = intf->minor;
984 info("usblp%d: USB %sdirectional printer dev %d "
985 "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X",
986 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
987 usblp->ifnum,
988 usblp->protocol[usblp->current_protocol].alt_setting,
989 usblp->current_protocol,
990 le16_to_cpu(usblp->dev->descriptor.idVendor),
991 le16_to_cpu(usblp->dev->descriptor.idProduct));
992
993 return 0;
994
995 abort_intfdata:
996 usb_set_intfdata (intf, NULL);
997 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
998 abort:
999 if (usblp) {
1000 if (usblp->writebuf)
1001 usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1002 usblp->writebuf, usblp->writeurb->transfer_dma);
1003 if (usblp->readbuf)
1004 usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1005 usblp->readbuf, usblp->readurb->transfer_dma);
1006 kfree(usblp->statusbuf);
1007 kfree(usblp->device_id_string);
1008 usb_free_urb(usblp->writeurb);
1009 usb_free_urb(usblp->readurb);
1010 kfree(usblp);
1011 }
1012 return -EIO;
1013 }
1014
1015 /*
1016 * We are a "new" style driver with usb_device_id table,
1017 * but our requirements are too intricate for simple match to handle.
1018 *
1019 * The "proto_bias" option may be used to specify the preferred protocol
1020 * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3). If the device
1021 * supports the preferred protocol, then we bind to it.
1022 *
1023 * The best interface for us is 7/1/2, because it is compatible
1024 * with a stream of characters. If we find it, we bind to it.
1025 *
1026 * Note that the people from hpoj.sourceforge.net need to be able to
1027 * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
1028 *
1029 * Failing 7/1/2, we look for 7/1/3, even though it's probably not
1030 * stream-compatible, because this matches the behaviour of the old code.
1031 *
1032 * If nothing else, we bind to 7/1/1 - the unidirectional interface.
1033 */
1034 static int usblp_select_alts(struct usblp *usblp)
1035 {
1036 struct usb_interface *if_alt;
1037 struct usb_host_interface *ifd;
1038 struct usb_endpoint_descriptor *epd, *epwrite, *epread;
1039 int p, i, e;
1040
1041 if_alt = usblp->intf;
1042
1043 for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1044 usblp->protocol[p].alt_setting = -1;
1045
1046 /* Find out what we have. */
1047 for (i = 0; i < if_alt->num_altsetting; i++) {
1048 ifd = &if_alt->altsetting[i];
1049
1050 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
1051 if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS))
1052 continue;
1053
1054 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1055 ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1056 continue;
1057
1058 /* Look for bulk OUT and IN endpoints. */
1059 epwrite = epread = NULL;
1060 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1061 epd = &ifd->endpoint[e].desc;
1062
1063 if (usb_endpoint_is_bulk_out(epd))
1064 if (!epwrite)
1065 epwrite = epd;
1066
1067 if (usb_endpoint_is_bulk_in(epd))
1068 if (!epread)
1069 epread = epd;
1070 }
1071
1072 /* Ignore buggy hardware without the right endpoints. */
1073 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1074 continue;
1075
1076 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1077 * and buggy bidirectional printers. */
1078 if (ifd->desc.bInterfaceProtocol == 1) {
1079 epread = NULL;
1080 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1081 info("Disabling reads from problem bidirectional "
1082 "printer on usblp%d", usblp->minor);
1083 epread = NULL;
1084 }
1085
1086 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1087 ifd->desc.bAlternateSetting;
1088 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1089 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1090 }
1091
1092 /* If our requested protocol is supported, then use it. */
1093 if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1094 proto_bias <= USBLP_LAST_PROTOCOL &&
1095 usblp->protocol[proto_bias].alt_setting != -1)
1096 return proto_bias;
1097
1098 /* Ordering is important here. */
1099 if (usblp->protocol[2].alt_setting != -1)
1100 return 2;
1101 if (usblp->protocol[1].alt_setting != -1)
1102 return 1;
1103 if (usblp->protocol[3].alt_setting != -1)
1104 return 3;
1105
1106 /* If nothing is available, then don't bind to this device. */
1107 return -1;
1108 }
1109
1110 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1111 {
1112 int r, alts;
1113
1114 if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1115 return -EINVAL;
1116
1117 alts = usblp->protocol[protocol].alt_setting;
1118 if (alts < 0)
1119 return -EINVAL;
1120 r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1121 if (r < 0) {
1122 err("can't set desired altsetting %d on interface %d",
1123 alts, usblp->ifnum);
1124 return r;
1125 }
1126
1127 usb_fill_bulk_urb(usblp->writeurb, usblp->dev,
1128 usb_sndbulkpipe(usblp->dev,
1129 usblp->protocol[protocol].epwrite->bEndpointAddress),
1130 usblp->writebuf, 0,
1131 usblp_bulk_write, usblp);
1132
1133 usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1134 if (usblp->bidir)
1135 usb_fill_bulk_urb(usblp->readurb, usblp->dev,
1136 usb_rcvbulkpipe(usblp->dev,
1137 usblp->protocol[protocol].epread->bEndpointAddress),
1138 usblp->readbuf, USBLP_BUF_SIZE,
1139 usblp_bulk_read, usblp);
1140
1141 usblp->current_protocol = protocol;
1142 dbg("usblp%d set protocol %d", usblp->minor, protocol);
1143 return 0;
1144 }
1145
1146 /* Retrieves and caches device ID string.
1147 * Returns length, including length bytes but not null terminator.
1148 * On error, returns a negative errno value. */
1149 static int usblp_cache_device_id_string(struct usblp *usblp)
1150 {
1151 int err, length;
1152
1153 err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1154 if (err < 0) {
1155 dbg("usblp%d: error = %d reading IEEE-1284 Device ID string",
1156 usblp->minor, err);
1157 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1158 return -EIO;
1159 }
1160
1161 /* First two bytes are length in big-endian.
1162 * They count themselves, and we copy them into
1163 * the user's buffer. */
1164 length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1165 if (length < 2)
1166 length = 2;
1167 else if (length >= USBLP_DEVICE_ID_SIZE)
1168 length = USBLP_DEVICE_ID_SIZE - 1;
1169 usblp->device_id_string[length] = '\0';
1170
1171 dbg("usblp%d Device ID string [len=%d]=\"%s\"",
1172 usblp->minor, length, &usblp->device_id_string[2]);
1173
1174 return length;
1175 }
1176
1177 static void usblp_disconnect(struct usb_interface *intf)
1178 {
1179 struct usblp *usblp = usb_get_intfdata (intf);
1180
1181 usb_deregister_dev(intf, &usblp_class);
1182
1183 if (!usblp || !usblp->dev) {
1184 err("bogus disconnect");
1185 BUG ();
1186 }
1187
1188 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1189
1190 mutex_lock (&usblp_mutex);
1191 mutex_lock (&usblp->mut);
1192 usblp->present = 0;
1193 usb_set_intfdata (intf, NULL);
1194
1195 usblp_unlink_urbs(usblp);
1196 usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1197 usblp->writebuf, usblp->writeurb->transfer_dma);
1198 usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1199 usblp->readbuf, usblp->readurb->transfer_dma);
1200 mutex_unlock (&usblp->mut);
1201
1202 if (!usblp->used)
1203 usblp_cleanup (usblp);
1204 mutex_unlock (&usblp_mutex);
1205 }
1206
1207 static int usblp_suspend (struct usb_interface *intf, pm_message_t message)
1208 {
1209 struct usblp *usblp = usb_get_intfdata (intf);
1210
1211 /* we take no more IO */
1212 usblp->sleeping = 1;
1213 usblp_unlink_urbs(usblp);
1214
1215 return 0;
1216 }
1217
1218 static int usblp_resume (struct usb_interface *intf)
1219 {
1220 struct usblp *usblp = usb_get_intfdata (intf);
1221 int r;
1222
1223 usblp->sleeping = 0;
1224 r = handle_bidir (usblp);
1225
1226 return r;
1227 }
1228
1229 static struct usb_device_id usblp_ids [] = {
1230 { USB_DEVICE_INFO(7, 1, 1) },
1231 { USB_DEVICE_INFO(7, 1, 2) },
1232 { USB_DEVICE_INFO(7, 1, 3) },
1233 { USB_INTERFACE_INFO(7, 1, 1) },
1234 { USB_INTERFACE_INFO(7, 1, 2) },
1235 { USB_INTERFACE_INFO(7, 1, 3) },
1236 { USB_DEVICE(0x04b8, 0x0202) }, /* Seiko Epson Receipt Printer M129C */
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 .supports_autosuspend = 1,
1250 };
1251
1252 static int __init usblp_init(void)
1253 {
1254 int retval;
1255 retval = usb_register(&usblp_driver);
1256 if (!retval)
1257 info(DRIVER_VERSION ": " DRIVER_DESC);
1258
1259 return retval;
1260 }
1261
1262 static void __exit usblp_exit(void)
1263 {
1264 usb_deregister(&usblp_driver);
1265 }
1266
1267 module_init(usblp_init);
1268 module_exit(usblp_exit);
1269
1270 MODULE_AUTHOR( DRIVER_AUTHOR );
1271 MODULE_DESCRIPTION( DRIVER_DESC );
1272 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1273 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1274 MODULE_LICENSE("GPL");
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