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header cleaning: don't include smp_lock.h when not used
[linux-2.6.git] / drivers / usb / class / usblp.c
blob15e740e3a5c47c41bb09340aac5811be1241e09f
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 usblp->used = 0;
352 return -EIO;
353 }
354 }
355
356 return 0;
357 }
358
359 /*
360 * File op functions.
361 */
362
363 static int usblp_open(struct inode *inode, struct file *file)
364 {
365 int minor = iminor(inode);
366 struct usblp *usblp;
367 struct usb_interface *intf;
368 int retval;
369
370 if (minor < 0)
371 return -ENODEV;
372
373 mutex_lock (&usblp_mutex);
374
375 retval = -ENODEV;
376 intf = usb_find_interface(&usblp_driver, minor);
377 if (!intf) {
378 goto out;
379 }
380 usblp = usb_get_intfdata (intf);
381 if (!usblp || !usblp->dev || !usblp->present)
382 goto out;
383
384 retval = -EBUSY;
385 if (usblp->used)
386 goto out;
387
388 /*
389 * TODO: need to implement LP_ABORTOPEN + O_NONBLOCK as in drivers/char/lp.c ???
390 * This is #if 0-ed because we *don't* want to fail an open
391 * just because the printer is off-line.
392 */
393 #if 0
394 if ((retval = usblp_check_status(usblp, 0))) {
395 retval = retval > 1 ? -EIO : -ENOSPC;
396 goto out;
397 }
398 #else
399 retval = 0;
400 #endif
401
402 retval = usb_autopm_get_interface(intf);
403 if (retval < 0)
404 goto out;
405 usblp->used = 1;
406 file->private_data = usblp;
407
408 usblp->writeurb->transfer_buffer_length = 0;
409 usblp->wcomplete = 1; /* we begin writeable */
410 usblp->rcomplete = 0;
411 usblp->writeurb->status = 0;
412 usblp->readurb->status = 0;
413
414 if (handle_bidir(usblp) < 0) {
415 file->private_data = NULL;
416 retval = -EIO;
417 }
418 out:
419 mutex_unlock (&usblp_mutex);
420 return retval;
421 }
422
423 static void usblp_cleanup (struct usblp *usblp)
424 {
425 info("usblp%d: removed", usblp->minor);
426
427 kfree (usblp->device_id_string);
428 kfree (usblp->statusbuf);
429 usb_free_urb(usblp->writeurb);
430 usb_free_urb(usblp->readurb);
431 kfree (usblp);
432 }
433
434 static void usblp_unlink_urbs(struct usblp *usblp)
435 {
436 usb_kill_urb(usblp->writeurb);
437 if (usblp->bidir)
438 usb_kill_urb(usblp->readurb);
439 }
440
441 static int usblp_release(struct inode *inode, struct file *file)
442 {
443 struct usblp *usblp = file->private_data;
444
445 mutex_lock (&usblp_mutex);
446 usblp->used = 0;
447 if (usblp->present) {
448 usblp_unlink_urbs(usblp);
449 usb_autopm_put_interface(usblp->intf);
450 } else /* finish cleanup from disconnect */
451 usblp_cleanup (usblp);
452 mutex_unlock (&usblp_mutex);
453 return 0;
454 }
455
456 /* No kernel lock - fine */
457 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
458 {
459 struct usblp *usblp = file->private_data;
460 poll_wait(file, &usblp->wait, wait);
461 return ((!usblp->bidir || !usblp->rcomplete) ? 0 : POLLIN | POLLRDNORM)
462 | (!usblp->wcomplete ? 0 : POLLOUT | POLLWRNORM);
463 }
464
465 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
466 {
467 struct usblp *usblp = file->private_data;
468 int length, err, i;
469 unsigned char newChannel;
470 int status;
471 int twoints[2];
472 int retval = 0;
473
474 mutex_lock (&usblp->mut);
475 if (!usblp->present) {
476 retval = -ENODEV;
477 goto done;
478 }
479
480 if (usblp->sleeping) {
481 retval = -ENODEV;
482 goto done;
483 }
484
485 dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd),
486 _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd) );
487
488 if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */
489
490 switch (_IOC_NR(cmd)) {
491
492 case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
493 if (_IOC_DIR(cmd) != _IOC_READ) {
494 retval = -EINVAL;
495 goto done;
496 }
497
498 length = usblp_cache_device_id_string(usblp);
499 if (length < 0) {
500 retval = length;
501 goto done;
502 }
503 if (length > _IOC_SIZE(cmd))
504 length = _IOC_SIZE(cmd); /* truncate */
505
506 if (copy_to_user((void __user *) arg,
507 usblp->device_id_string,
508 (unsigned long) length)) {
509 retval = -EFAULT;
510 goto done;
511 }
512
513 break;
514
515 case IOCNR_GET_PROTOCOLS:
516 if (_IOC_DIR(cmd) != _IOC_READ ||
517 _IOC_SIZE(cmd) < sizeof(twoints)) {
518 retval = -EINVAL;
519 goto done;
520 }
521
522 twoints[0] = usblp->current_protocol;
523 twoints[1] = 0;
524 for (i = USBLP_FIRST_PROTOCOL;
525 i <= USBLP_LAST_PROTOCOL; i++) {
526 if (usblp->protocol[i].alt_setting >= 0)
527 twoints[1] |= (1<<i);
528 }
529
530 if (copy_to_user((void __user *)arg,
531 (unsigned char *)twoints,
532 sizeof(twoints))) {
533 retval = -EFAULT;
534 goto done;
535 }
536
537 break;
538
539 case IOCNR_SET_PROTOCOL:
540 if (_IOC_DIR(cmd) != _IOC_WRITE) {
541 retval = -EINVAL;
542 goto done;
543 }
544
545 #ifdef DEBUG
546 if (arg == -10) {
547 usblp_dump(usblp);
548 break;
549 }
550 #endif
551
552 usblp_unlink_urbs(usblp);
553 retval = usblp_set_protocol(usblp, arg);
554 if (retval < 0) {
555 usblp_set_protocol(usblp,
556 usblp->current_protocol);
557 }
558 break;
559
560 case IOCNR_HP_SET_CHANNEL:
561 if (_IOC_DIR(cmd) != _IOC_WRITE ||
562 le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
563 usblp->quirks & USBLP_QUIRK_BIDIR) {
564 retval = -EINVAL;
565 goto done;
566 }
567
568 err = usblp_hp_channel_change_request(usblp,
569 arg, &newChannel);
570 if (err < 0) {
571 err("usblp%d: error = %d setting "
572 "HP channel",
573 usblp->minor, err);
574 retval = -EIO;
575 goto done;
576 }
577
578 dbg("usblp%d requested/got HP channel %ld/%d",
579 usblp->minor, arg, newChannel);
580 break;
581
582 case IOCNR_GET_BUS_ADDRESS:
583 if (_IOC_DIR(cmd) != _IOC_READ ||
584 _IOC_SIZE(cmd) < sizeof(twoints)) {
585 retval = -EINVAL;
586 goto done;
587 }
588
589 twoints[0] = usblp->dev->bus->busnum;
590 twoints[1] = usblp->dev->devnum;
591 if (copy_to_user((void __user *)arg,
592 (unsigned char *)twoints,
593 sizeof(twoints))) {
594 retval = -EFAULT;
595 goto done;
596 }
597
598 dbg("usblp%d is bus=%d, device=%d",
599 usblp->minor, twoints[0], twoints[1]);
600 break;
601
602 case IOCNR_GET_VID_PID:
603 if (_IOC_DIR(cmd) != _IOC_READ ||
604 _IOC_SIZE(cmd) < sizeof(twoints)) {
605 retval = -EINVAL;
606 goto done;
607 }
608
609 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
610 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
611 if (copy_to_user((void __user *)arg,
612 (unsigned char *)twoints,
613 sizeof(twoints))) {
614 retval = -EFAULT;
615 goto done;
616 }
617
618 dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X",
619 usblp->minor, twoints[0], twoints[1]);
620 break;
621
622 case IOCNR_SOFT_RESET:
623 if (_IOC_DIR(cmd) != _IOC_NONE) {
624 retval = -EINVAL;
625 goto done;
626 }
627 retval = usblp_reset(usblp);
628 break;
629 default:
630 retval = -ENOTTY;
631 }
632 else /* old-style ioctl value */
633 switch (cmd) {
634
635 case LPGETSTATUS:
636 if (usblp_read_status(usblp, usblp->statusbuf)) {
637 if (printk_ratelimit())
638 err("usblp%d: failed reading printer status",
639 usblp->minor);
640 retval = -EIO;
641 goto done;
642 }
643 status = *usblp->statusbuf;
644 if (copy_to_user ((void __user *)arg, &status, sizeof(int)))
645 retval = -EFAULT;
646 break;
647
648 default:
649 retval = -ENOTTY;
650 }
651
652 done:
653 mutex_unlock (&usblp->mut);
654 return retval;
655 }
656
657 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
658 {
659 struct usblp *usblp = file->private_data;
660 int timeout, intr, rv, err = 0, transfer_length = 0;
661 size_t writecount = 0;
662
663 while (writecount < count) {
664 if (!usblp->wcomplete) {
665 barrier();
666 if (file->f_flags & O_NONBLOCK) {
667 writecount += transfer_length;
668 return writecount ? writecount : -EAGAIN;
669 }
670
671 timeout = USBLP_WRITE_TIMEOUT;
672
673 rv = wait_event_interruptible_timeout(usblp->wait, usblp->wcomplete || !usblp->present , timeout);
674 if (rv < 0)
675 return writecount ? writecount : -EINTR;
676 }
677 intr = mutex_lock_interruptible (&usblp->mut);
678 if (intr)
679 return writecount ? writecount : -EINTR;
680 if (!usblp->present) {
681 mutex_unlock (&usblp->mut);
682 return -ENODEV;
683 }
684
685 if (usblp->sleeping) {
686 mutex_unlock (&usblp->mut);
687 return writecount ? writecount : -ENODEV;
688 }
689
690 if (usblp->writeurb->status != 0) {
691 if (usblp->quirks & USBLP_QUIRK_BIDIR) {
692 if (!usblp->wcomplete)
693 err("usblp%d: error %d writing to printer",
694 usblp->minor, usblp->writeurb->status);
695 err = usblp->writeurb->status;
696 } else
697 err = usblp_check_status(usblp, err);
698 mutex_unlock (&usblp->mut);
699
700 /* if the fault was due to disconnect, let khubd's
701 * call to usblp_disconnect() grab usblp->mut ...
702 */
703 schedule ();
704 continue;
705 }
706
707 /* We must increment writecount here, and not at the
708 * end of the loop. Otherwise, the final loop iteration may
709 * be skipped, leading to incomplete printer output.
710 */
711 writecount += transfer_length;
712 if (writecount == count) {
713 mutex_unlock(&usblp->mut);
714 break;
715 }
716
717 transfer_length=(count - writecount);
718 if (transfer_length > USBLP_BUF_SIZE)
719 transfer_length = USBLP_BUF_SIZE;
720
721 usblp->writeurb->transfer_buffer_length = transfer_length;
722
723 if (copy_from_user(usblp->writeurb->transfer_buffer,
724 buffer + writecount, transfer_length)) {
725 mutex_unlock(&usblp->mut);
726 return writecount ? writecount : -EFAULT;
727 }
728
729 usblp->writeurb->dev = usblp->dev;
730 usblp->wcomplete = 0;
731 err = usb_submit_urb(usblp->writeurb, GFP_KERNEL);
732 if (err) {
733 usblp->wcomplete = 1;
734 if (err != -ENOMEM)
735 count = -EIO;
736 else
737 count = writecount ? writecount : -ENOMEM;
738 mutex_unlock (&usblp->mut);
739 break;
740 }
741 mutex_unlock (&usblp->mut);
742 }
743
744 return count;
745 }
746
747 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
748 {
749 struct usblp *usblp = file->private_data;
750 int rv, intr;
751
752 if (!usblp->bidir)
753 return -EINVAL;
754
755 intr = mutex_lock_interruptible (&usblp->mut);
756 if (intr)
757 return -EINTR;
758 if (!usblp->present) {
759 count = -ENODEV;
760 goto done;
761 }
762
763 if (!usblp->rcomplete) {
764 barrier();
765
766 if (file->f_flags & O_NONBLOCK) {
767 count = -EAGAIN;
768 goto done;
769 }
770 mutex_unlock(&usblp->mut);
771 rv = wait_event_interruptible(usblp->wait, usblp->rcomplete || !usblp->present);
772 mutex_lock(&usblp->mut);
773 if (rv < 0) {
774 count = -EINTR;
775 goto done;
776 }
777 }
778
779 if (!usblp->present) {
780 count = -ENODEV;
781 goto done;
782 }
783
784 if (usblp->sleeping) {
785 count = -ENODEV;
786 goto done;
787 }
788
789 if (usblp->readurb->status) {
790 err("usblp%d: error %d reading from printer",
791 usblp->minor, usblp->readurb->status);
792 usblp->readurb->dev = usblp->dev;
793 usblp->readcount = 0;
794 usblp->rcomplete = 0;
795 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0)
796 dbg("error submitting urb");
797 count = -EIO;
798 goto done;
799 }
800
801 count = count < usblp->readurb->actual_length - usblp->readcount ?
802 count : usblp->readurb->actual_length - usblp->readcount;
803
804 if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) {
805 count = -EFAULT;
806 goto done;
807 }
808
809 if ((usblp->readcount += count) == usblp->readurb->actual_length) {
810 usblp->readcount = 0;
811 usblp->readurb->dev = usblp->dev;
812 usblp->rcomplete = 0;
813 if (usb_submit_urb(usblp->readurb, GFP_KERNEL)) {
814 count = -EIO;
815 goto done;
816 }
817 }
818
819 done:
820 mutex_unlock (&usblp->mut);
821 return count;
822 }
823
824 /*
825 * Checks for printers that have quirks, such as requiring unidirectional
826 * communication but reporting bidirectional; currently some HP printers
827 * have this flaw (HP 810, 880, 895, etc.), or needing an init string
828 * sent at each open (like some Epsons).
829 * Returns 1 if found, 0 if not found.
830 *
831 * HP recommended that we use the bidirectional interface but
832 * don't attempt any bulk IN transfers from the IN endpoint.
833 * Here's some more detail on the problem:
834 * The problem is not that it isn't bidirectional though. The problem
835 * is that if you request a device ID, or status information, while
836 * the buffers are full, the return data will end up in the print data
837 * buffer. For example if you make sure you never request the device ID
838 * while you are sending print data, and you don't try to query the
839 * printer status every couple of milliseconds, you will probably be OK.
840 */
841 static unsigned int usblp_quirks (__u16 vendor, __u16 product)
842 {
843 int i;
844
845 for (i = 0; quirk_printers[i].vendorId; i++) {
846 if (vendor == quirk_printers[i].vendorId &&
847 product == quirk_printers[i].productId)
848 return quirk_printers[i].quirks;
849 }
850 return 0;
851 }
852
853 static const struct file_operations usblp_fops = {
854 .owner = THIS_MODULE,
855 .read = usblp_read,
856 .write = usblp_write,
857 .poll = usblp_poll,
858 .unlocked_ioctl = usblp_ioctl,
859 .compat_ioctl = usblp_ioctl,
860 .open = usblp_open,
861 .release = usblp_release,
862 };
863
864 static struct usb_class_driver usblp_class = {
865 .name = "lp%d",
866 .fops = &usblp_fops,
867 .minor_base = USBLP_MINOR_BASE,
868 };
869
870 static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf)
871 {
872 struct usb_interface *intf = to_usb_interface(dev);
873 struct usblp *usblp = usb_get_intfdata (intf);
874
875 if (usblp->device_id_string[0] == 0 &&
876 usblp->device_id_string[1] == 0)
877 return 0;
878
879 return sprintf(buf, "%s", usblp->device_id_string+2);
880 }
881
882 static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL);
883
884 static int usblp_probe(struct usb_interface *intf,
885 const struct usb_device_id *id)
886 {
887 struct usb_device *dev = interface_to_usbdev (intf);
888 struct usblp *usblp = NULL;
889 int protocol;
890 int retval;
891
892 /* Malloc and start initializing usblp structure so we can use it
893 * directly. */
894 if (!(usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL))) {
895 err("out of memory for usblp");
896 goto abort;
897 }
898 usblp->dev = dev;
899 mutex_init (&usblp->mut);
900 init_waitqueue_head(&usblp->wait);
901 usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
902 usblp->intf = intf;
903
904 usblp->writeurb = usb_alloc_urb(0, GFP_KERNEL);
905 if (!usblp->writeurb) {
906 err("out of memory");
907 goto abort;
908 }
909 usblp->readurb = usb_alloc_urb(0, GFP_KERNEL);
910 if (!usblp->readurb) {
911 err("out of memory");
912 goto abort;
913 }
914
915 /* Malloc device ID string buffer to the largest expected length,
916 * since we can re-query it on an ioctl and a dynamic string
917 * could change in length. */
918 if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
919 err("out of memory for device_id_string");
920 goto abort;
921 }
922
923 usblp->writebuf = usblp->readbuf = NULL;
924 usblp->writeurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
925 usblp->readurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
926 /* Malloc write & read buffers. We somewhat wastefully
927 * malloc both regardless of bidirectionality, because the
928 * alternate setting can be changed later via an ioctl. */
929 if (!(usblp->writebuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
930 GFP_KERNEL, &usblp->writeurb->transfer_dma))) {
931 err("out of memory for write buf");
932 goto abort;
933 }
934 if (!(usblp->readbuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
935 GFP_KERNEL, &usblp->readurb->transfer_dma))) {
936 err("out of memory for read buf");
937 goto abort;
938 }
939
940 /* Allocate buffer for printer status */
941 usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
942 if (!usblp->statusbuf) {
943 err("out of memory for statusbuf");
944 goto abort;
945 }
946
947 /* Lookup quirks for this printer. */
948 usblp->quirks = usblp_quirks(
949 le16_to_cpu(dev->descriptor.idVendor),
950 le16_to_cpu(dev->descriptor.idProduct));
951
952 /* Analyze and pick initial alternate settings and endpoints. */
953 protocol = usblp_select_alts(usblp);
954 if (protocol < 0) {
955 dbg("incompatible printer-class device 0x%4.4X/0x%4.4X",
956 le16_to_cpu(dev->descriptor.idVendor),
957 le16_to_cpu(dev->descriptor.idProduct));
958 goto abort;
959 }
960
961 /* Setup the selected alternate setting and endpoints. */
962 if (usblp_set_protocol(usblp, protocol) < 0)
963 goto abort;
964
965 /* Retrieve and store the device ID string. */
966 usblp_cache_device_id_string(usblp);
967 retval = device_create_file(&intf->dev, &dev_attr_ieee1284_id);
968 if (retval)
969 goto abort_intfdata;
970
971 #ifdef DEBUG
972 usblp_check_status(usblp, 0);
973 #endif
974
975 usb_set_intfdata (intf, usblp);
976
977 usblp->present = 1;
978
979 retval = usb_register_dev(intf, &usblp_class);
980 if (retval) {
981 err("Not able to get a minor for this device.");
982 goto abort_intfdata;
983 }
984 usblp->minor = intf->minor;
985 info("usblp%d: USB %sdirectional printer dev %d "
986 "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X",
987 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
988 usblp->ifnum,
989 usblp->protocol[usblp->current_protocol].alt_setting,
990 usblp->current_protocol,
991 le16_to_cpu(usblp->dev->descriptor.idVendor),
992 le16_to_cpu(usblp->dev->descriptor.idProduct));
993
994 return 0;
995
996 abort_intfdata:
997 usb_set_intfdata (intf, NULL);
998 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
999 abort:
1000 if (usblp) {
1001 if (usblp->writebuf)
1002 usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1003 usblp->writebuf, usblp->writeurb->transfer_dma);
1004 if (usblp->readbuf)
1005 usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1006 usblp->readbuf, usblp->writeurb->transfer_dma);
1007 kfree(usblp->statusbuf);
1008 kfree(usblp->device_id_string);
1009 usb_free_urb(usblp->writeurb);
1010 usb_free_urb(usblp->readurb);
1011 kfree(usblp);
1012 }
1013 return -EIO;
1014 }
1015
1016 /*
1017 * We are a "new" style driver with usb_device_id table,
1018 * but our requirements are too intricate for simple match to handle.
1019 *
1020 * The "proto_bias" option may be used to specify the preferred protocol
1021 * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3). If the device
1022 * supports the preferred protocol, then we bind to it.
1023 *
1024 * The best interface for us is 7/1/2, because it is compatible
1025 * with a stream of characters. If we find it, we bind to it.
1026 *
1027 * Note that the people from hpoj.sourceforge.net need to be able to
1028 * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
1029 *
1030 * Failing 7/1/2, we look for 7/1/3, even though it's probably not
1031 * stream-compatible, because this matches the behaviour of the old code.
1032 *
1033 * If nothing else, we bind to 7/1/1 - the unidirectional interface.
1034 */
1035 static int usblp_select_alts(struct usblp *usblp)
1036 {
1037 struct usb_interface *if_alt;
1038 struct usb_host_interface *ifd;
1039 struct usb_endpoint_descriptor *epd, *epwrite, *epread;
1040 int p, i, e;
1041
1042 if_alt = usblp->intf;
1043
1044 for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1045 usblp->protocol[p].alt_setting = -1;
1046
1047 /* Find out what we have. */
1048 for (i = 0; i < if_alt->num_altsetting; i++) {
1049 ifd = &if_alt->altsetting[i];
1050
1051 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
1052 if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS))
1053 continue;
1054
1055 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1056 ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1057 continue;
1058
1059 /* Look for bulk OUT and IN endpoints. */
1060 epwrite = epread = NULL;
1061 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1062 epd = &ifd->endpoint[e].desc;
1063
1064 if (usb_endpoint_is_bulk_out(epd))
1065 if (!epwrite)
1066 epwrite = epd;
1067
1068 if (usb_endpoint_is_bulk_in(epd))
1069 if (!epread)
1070 epread = epd;
1071 }
1072
1073 /* Ignore buggy hardware without the right endpoints. */
1074 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1075 continue;
1076
1077 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1078 * and buggy bidirectional printers. */
1079 if (ifd->desc.bInterfaceProtocol == 1) {
1080 epread = NULL;
1081 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1082 info("Disabling reads from problem bidirectional "
1083 "printer on usblp%d", usblp->minor);
1084 epread = NULL;
1085 }
1086
1087 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1088 ifd->desc.bAlternateSetting;
1089 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1090 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1091 }
1092
1093 /* If our requested protocol is supported, then use it. */
1094 if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1095 proto_bias <= USBLP_LAST_PROTOCOL &&
1096 usblp->protocol[proto_bias].alt_setting != -1)
1097 return proto_bias;
1098
1099 /* Ordering is important here. */
1100 if (usblp->protocol[2].alt_setting != -1)
1101 return 2;
1102 if (usblp->protocol[1].alt_setting != -1)
1103 return 1;
1104 if (usblp->protocol[3].alt_setting != -1)
1105 return 3;
1106
1107 /* If nothing is available, then don't bind to this device. */
1108 return -1;
1109 }
1110
1111 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1112 {
1113 int r, alts;
1114
1115 if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1116 return -EINVAL;
1117
1118 alts = usblp->protocol[protocol].alt_setting;
1119 if (alts < 0)
1120 return -EINVAL;
1121 r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1122 if (r < 0) {
1123 err("can't set desired altsetting %d on interface %d",
1124 alts, usblp->ifnum);
1125 return r;
1126 }
1127
1128 usb_fill_bulk_urb(usblp->writeurb, usblp->dev,
1129 usb_sndbulkpipe(usblp->dev,
1130 usblp->protocol[protocol].epwrite->bEndpointAddress),
1131 usblp->writebuf, 0,
1132 usblp_bulk_write, usblp);
1133
1134 usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1135 if (usblp->bidir)
1136 usb_fill_bulk_urb(usblp->readurb, usblp->dev,
1137 usb_rcvbulkpipe(usblp->dev,
1138 usblp->protocol[protocol].epread->bEndpointAddress),
1139 usblp->readbuf, USBLP_BUF_SIZE,
1140 usblp_bulk_read, usblp);
1141
1142 usblp->current_protocol = protocol;
1143 dbg("usblp%d set protocol %d", usblp->minor, protocol);
1144 return 0;
1145 }
1146
1147 /* Retrieves and caches device ID string.
1148 * Returns length, including length bytes but not null terminator.
1149 * On error, returns a negative errno value. */
1150 static int usblp_cache_device_id_string(struct usblp *usblp)
1151 {
1152 int err, length;
1153
1154 err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1155 if (err < 0) {
1156 dbg("usblp%d: error = %d reading IEEE-1284 Device ID string",
1157 usblp->minor, err);
1158 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1159 return -EIO;
1160 }
1161
1162 /* First two bytes are length in big-endian.
1163 * They count themselves, and we copy them into
1164 * the user's buffer. */
1165 length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1166 if (length < 2)
1167 length = 2;
1168 else if (length >= USBLP_DEVICE_ID_SIZE)
1169 length = USBLP_DEVICE_ID_SIZE - 1;
1170 usblp->device_id_string[length] = '\0';
1171
1172 dbg("usblp%d Device ID string [len=%d]=\"%s\"",
1173 usblp->minor, length, &usblp->device_id_string[2]);
1174
1175 return length;
1176 }
1177
1178 static void usblp_disconnect(struct usb_interface *intf)
1179 {
1180 struct usblp *usblp = usb_get_intfdata (intf);
1181
1182 usb_deregister_dev(intf, &usblp_class);
1183
1184 if (!usblp || !usblp->dev) {
1185 err("bogus disconnect");
1186 BUG ();
1187 }
1188
1189 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1190
1191 mutex_lock (&usblp_mutex);
1192 mutex_lock (&usblp->mut);
1193 usblp->present = 0;
1194 usb_set_intfdata (intf, NULL);
1195
1196 usblp_unlink_urbs(usblp);
1197 usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1198 usblp->writebuf, usblp->writeurb->transfer_dma);
1199 usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1200 usblp->readbuf, usblp->readurb->transfer_dma);
1201 mutex_unlock (&usblp->mut);
1202
1203 if (!usblp->used)
1204 usblp_cleanup (usblp);
1205 mutex_unlock (&usblp_mutex);
1206 }
1207
1208 static int usblp_suspend (struct usb_interface *intf, pm_message_t message)
1209 {
1210 struct usblp *usblp = usb_get_intfdata (intf);
1211
1212 /* we take no more IO */
1213 usblp->sleeping = 1;
1214 usblp_unlink_urbs(usblp);
1215
1216 return 0;
1217 }
1218
1219 static int usblp_resume (struct usb_interface *intf)
1220 {
1221 struct usblp *usblp = usb_get_intfdata (intf);
1222 int r;
1223
1224 usblp->sleeping = 0;
1225 r = handle_bidir (usblp);
1226
1227 return r;
1228 }
1229
1230 static struct usb_device_id usblp_ids [] = {
1231 { USB_DEVICE_INFO(7, 1, 1) },
1232 { USB_DEVICE_INFO(7, 1, 2) },
1233 { USB_DEVICE_INFO(7, 1, 3) },
1234 { USB_INTERFACE_INFO(7, 1, 1) },
1235 { USB_INTERFACE_INFO(7, 1, 2) },
1236 { USB_INTERFACE_INFO(7, 1, 3) },
1237 { USB_DEVICE(0x04b8, 0x0202) }, /* Seiko Epson Receipt Printer M129C */
1238 { } /* Terminating entry */
1239 };
1240
1241 MODULE_DEVICE_TABLE (usb, usblp_ids);
1242
1243 static struct usb_driver usblp_driver = {
1244 .name = "usblp",
1245 .probe = usblp_probe,
1246 .disconnect = usblp_disconnect,
1247 .suspend = usblp_suspend,
1248 .resume = usblp_resume,
1249 .id_table = usblp_ids,
1250 .supports_autosuspend = 1,
1251 };
1252
1253 static int __init usblp_init(void)
1254 {
1255 int retval;
1256 retval = usb_register(&usblp_driver);
1257 if (!retval)
1258 info(DRIVER_VERSION ": " DRIVER_DESC);
1259
1260 return retval;
1261 }
1262
1263 static void __exit usblp_exit(void)
1264 {
1265 usb_deregister(&usblp_driver);
1266 }
1267
1268 module_init(usblp_init);
1269 module_exit(usblp_exit);
1270
1271 MODULE_AUTHOR( DRIVER_AUTHOR );
1272 MODULE_DESCRIPTION( DRIVER_DESC );
1273 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1274 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1275 MODULE_LICENSE("GPL");
Linus' kernel tree