Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6
[linux-2.6] / drivers / usb / class / usblp.c
1 /*
2  * usblp.c  Version 0.13
3  *
4  * Copyright (c) 1999 Michael Gee       <michael@linuxspecific.com>
5  * Copyright (c) 1999 Pavel Machek      <pavel@suse.cz>
6  * Copyright (c) 2000 Randy Dunlap      <rdunlap@xenotime.net>
7  * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
8  # Copyright (c) 2001 Pete Zaitcev      <zaitcev@redhat.com>
9  # Copyright (c) 2001 David Paschal     <paschal@rcsis.com>
10  * Copyright (c) 2006 Oliver Neukum     <oliver@neukum.name>
11  *
12  * USB Printer Device Class driver for USB printers and printer cables
13  *
14  * Sponsored by SuSE
15  *
16  * ChangeLog:
17  *      v0.1 - thorough cleaning, URBification, almost a rewrite
18  *      v0.2 - some more cleanups
19  *      v0.3 - cleaner again, waitqueue fixes
20  *      v0.4 - fixes in unidirectional mode
21  *      v0.5 - add DEVICE_ID string support
22  *      v0.6 - never time out
23  *      v0.7 - fixed bulk-IN read and poll (David Paschal)
24  *      v0.8 - add devfs support
25  *      v0.9 - fix unplug-while-open paths
26  *      v0.10- remove sleep_on, fix error on oom (oliver@neukum.org)
27  *      v0.11 - add proto_bias option (Pete Zaitcev)
28  *      v0.12 - add hpoj.sourceforge.net ioctls (David Paschal)
29  *      v0.13 - alloc space for statusbuf (<status> not on stack);
30  *              use usb_buffer_alloc() for read buf & write buf;
31  */
32
33 /*
34  * This program is free software; you can redistribute it and/or modify
35  * it under the terms of the GNU General Public License as published by
36  * the Free Software Foundation; either version 2 of the License, or
37  * (at your option) any later version.
38  *
39  * This program is distributed in the hope that it will be useful,
40  * but WITHOUT ANY WARRANTY; without even the implied warranty of
41  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
42  * GNU General Public License for more details.
43  *
44  * You should have received a copy of the GNU General Public License
45  * along with this program; if not, write to the Free Software
46  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
47  */
48
49 #include <linux/module.h>
50 #include <linux/kernel.h>
51 #include <linux/sched.h>
52 #include <linux/smp_lock.h>
53 #include <linux/signal.h>
54 #include <linux/poll.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
57 #include <linux/lp.h>
58 #include <linux/mutex.h>
59 #undef DEBUG
60 #include <linux/usb.h>
61
62 /*
63  * Version Information
64  */
65 #define DRIVER_VERSION "v0.13"
66 #define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal"
67 #define DRIVER_DESC "USB Printer Device Class driver"
68
69 #define USBLP_BUF_SIZE          8192
70 #define USBLP_DEVICE_ID_SIZE    1024
71
72 /* ioctls: */
73 #define LPGETSTATUS             0x060b          /* same as in drivers/char/lp.c */
74 #define IOCNR_GET_DEVICE_ID             1
75 #define IOCNR_GET_PROTOCOLS             2
76 #define IOCNR_SET_PROTOCOL              3
77 #define IOCNR_HP_SET_CHANNEL            4
78 #define IOCNR_GET_BUS_ADDRESS           5
79 #define IOCNR_GET_VID_PID               6
80 #define IOCNR_SOFT_RESET                7
81 /* Get device_id string: */
82 #define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len)
83 /* The following ioctls were added for http://hpoj.sourceforge.net: */
84 /* Get two-int array:
85  * [0]=current protocol (1=7/1/1, 2=7/1/2, 3=7/1/3),
86  * [1]=supported protocol mask (mask&(1<<n)!=0 means 7/1/n supported): */
87 #define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
88 /* Set protocol (arg: 1=7/1/1, 2=7/1/2, 3=7/1/3): */
89 #define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0)
90 /* Set channel number (HP Vendor-specific command): */
91 #define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0)
92 /* Get two-int array: [0]=bus number, [1]=device address: */
93 #define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len)
94 /* Get two-int array: [0]=vendor ID, [1]=product ID: */
95 #define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len)
96 /* Perform class specific soft reset */
97 #define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0);
98
99 /*
100  * A DEVICE_ID string may include the printer's serial number.
101  * It should end with a semi-colon (';').
102  * An example from an HP 970C DeskJet printer is (this is one long string,
103  * with the serial number changed):
104 MFG:HEWLETT-PACKARD;MDL:DESKJET 970C;CMD:MLC,PCL,PML;CLASS:PRINTER;DESCRIPTION:Hewlett-Packard DeskJet 970C;SERN:US970CSEPROF;VSTATUS:$HB0$NC0,ff,DN,IDLE,CUT,K1,C0,DP,NR,KP000,CP027;VP:0800,FL,B0;VJ:                    ;
105  */
106
107 /*
108  * USB Printer Requests
109  */
110
111 #define USBLP_REQ_GET_ID                        0x00
112 #define USBLP_REQ_GET_STATUS                    0x01
113 #define USBLP_REQ_RESET                         0x02
114 #define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST     0x00    /* HP Vendor-specific */
115
116 #define USBLP_MINORS            16
117 #define USBLP_MINOR_BASE        0
118
119 #define USBLP_WRITE_TIMEOUT     (5000)                  /* 5 seconds */
120
121 #define USBLP_FIRST_PROTOCOL    1
122 #define USBLP_LAST_PROTOCOL     3
123 #define USBLP_MAX_PROTOCOLS     (USBLP_LAST_PROTOCOL+1)
124
125 /*
126  * some arbitrary status buffer size;
127  * need a status buffer that is allocated via kmalloc(), not on stack
128  */
129 #define STATUS_BUF_SIZE         8
130
131 struct usblp {
132         struct usb_device       *dev;                   /* USB device */
133         struct mutex            mut;                    /* locks this struct, especially "dev" */
134         char                    *writebuf;              /* write transfer_buffer */
135         char                    *readbuf;               /* read transfer_buffer */
136         char                    *statusbuf;             /* status transfer_buffer */
137         struct urb              *readurb, *writeurb;    /* The urbs */
138         wait_queue_head_t       wait;                   /* Zzzzz ... */
139         int                     readcount;              /* Counter for reads */
140         int                     ifnum;                  /* Interface number */
141         struct usb_interface    *intf;                  /* The interface */
142         /* Alternate-setting numbers and endpoints for each protocol
143          * (7/1/{index=1,2,3}) that the device supports: */
144         struct {
145                 int                             alt_setting;
146                 struct usb_endpoint_descriptor  *epwrite;
147                 struct usb_endpoint_descriptor  *epread;
148         }                       protocol[USBLP_MAX_PROTOCOLS];
149         int                     current_protocol;
150         int                     minor;                  /* minor number of device */
151         int                     wcomplete;              /* writing is completed */
152         int                     rcomplete;              /* reading is completed */
153         unsigned int            quirks;                 /* quirks flags */
154         unsigned char           used;                   /* True if open */
155         unsigned char           present;                /* True if not disconnected */
156         unsigned char           bidir;                  /* interface is bidirectional */
157         unsigned char           sleeping;               /* interface is suspended */
158         unsigned char           *device_id_string;      /* IEEE 1284 DEVICE ID string (ptr) */
159                                                         /* first 2 bytes are (big-endian) length */
160 };
161
162 #ifdef DEBUG
163 static void usblp_dump(struct usblp *usblp) {
164         int p;
165
166         dbg("usblp=0x%p", usblp);
167         dbg("dev=0x%p", usblp->dev);
168         dbg("present=%d", usblp->present);
169         dbg("readbuf=0x%p", usblp->readbuf);
170         dbg("writebuf=0x%p", usblp->writebuf);
171         dbg("readurb=0x%p", usblp->readurb);
172         dbg("writeurb=0x%p", usblp->writeurb);
173         dbg("readcount=%d", usblp->readcount);
174         dbg("ifnum=%d", usblp->ifnum);
175     for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
176         dbg("protocol[%d].alt_setting=%d", p, usblp->protocol[p].alt_setting);
177         dbg("protocol[%d].epwrite=%p", p, usblp->protocol[p].epwrite);
178         dbg("protocol[%d].epread=%p", p, usblp->protocol[p].epread);
179     }
180         dbg("current_protocol=%d", usblp->current_protocol);
181         dbg("minor=%d", usblp->minor);
182         dbg("wcomplete=%d", usblp->wcomplete);
183         dbg("rcomplete=%d", usblp->rcomplete);
184         dbg("quirks=%d", usblp->quirks);
185         dbg("used=%d", usblp->used);
186         dbg("bidir=%d", usblp->bidir);
187         dbg("sleeping=%d", usblp->sleeping);
188         dbg("device_id_string=\"%s\"",
189                 usblp->device_id_string ?
190                         usblp->device_id_string + 2 :
191                         (unsigned char *)"(null)");
192 }
193 #endif
194
195 /* Quirks: various printer quirks are handled by this table & its flags. */
196
197 struct quirk_printer_struct {
198         __u16 vendorId;
199         __u16 productId;
200         unsigned int quirks;
201 };
202
203 #define USBLP_QUIRK_BIDIR       0x1     /* reports bidir but requires unidirectional mode (no INs/reads) */
204 #define USBLP_QUIRK_USB_INIT    0x2     /* needs vendor USB init string */
205 #define USBLP_QUIRK_BAD_CLASS   0x4     /* descriptor uses vendor-specific Class or SubClass */
206
207 static const struct quirk_printer_struct quirk_printers[] = {
208         { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
209         { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
210         { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
211         { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
212         { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
213         { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
214         { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */   
215         { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */   
216         { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
217         { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
218         { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
219         { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
220         { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
221         { 0x0482, 0x0010, USBLP_QUIRK_BIDIR }, /* Kyocera Mita FS 820, by zut <kernel@zut.de> */
222         { 0x04b8, 0x0202, USBLP_QUIRK_BAD_CLASS }, /* Seiko Epson Receipt Printer M129C */
223         { 0, 0 }
224 };
225
226 static int usblp_select_alts(struct usblp *usblp);
227 static int usblp_set_protocol(struct usblp *usblp, int protocol);
228 static int usblp_cache_device_id_string(struct usblp *usblp);
229
230 /* forward reference to make our lives easier */
231 static struct usb_driver usblp_driver;
232 static DEFINE_MUTEX(usblp_mutex);       /* locks the existence of usblp's */
233
234 /*
235  * Functions for usblp control messages.
236  */
237
238 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
239 {
240         int retval;
241         int index = usblp->ifnum;
242
243         /* High byte has the interface index.
244            Low byte has the alternate setting.
245          */
246         if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) {
247           index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
248         }
249
250         retval = usb_control_msg(usblp->dev,
251                 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
252                 request, type | dir | recip, value, index, buf, len, USBLP_WRITE_TIMEOUT);
253         dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d",
254                 request, !!dir, recip, value, index, len, retval);
255         return retval < 0 ? retval : 0;
256 }
257
258 #define usblp_read_status(usblp, status)\
259         usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
260 #define usblp_get_id(usblp, config, id, maxlen)\
261         usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
262 #define usblp_reset(usblp)\
263         usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
264
265 #define usblp_hp_channel_change_request(usblp, channel, buffer) \
266         usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
267
268 /*
269  * See the description for usblp_select_alts() below for the usage
270  * explanation.  Look into your /proc/bus/usb/devices and dmesg in
271  * case of any trouble.
272  */
273 static int proto_bias = -1;
274
275 /*
276  * URB callback.
277  */
278
279 static void usblp_bulk_read(struct urb *urb)
280 {
281         struct usblp *usblp = urb->context;
282
283         if (unlikely(!usblp || !usblp->dev || !usblp->used))
284                 return;
285
286         if (unlikely(!usblp->present))
287                 goto unplug;
288         if (unlikely(urb->status))
289                 warn("usblp%d: nonzero read/write bulk status received: %d",
290                         usblp->minor, urb->status);
291         usblp->rcomplete = 1;
292 unplug:
293         wake_up_interruptible(&usblp->wait);
294 }
295
296 static void usblp_bulk_write(struct urb *urb)
297 {
298         struct usblp *usblp = urb->context;
299
300         if (unlikely(!usblp || !usblp->dev || !usblp->used))
301                 return;
302         if (unlikely(!usblp->present))
303                 goto unplug;
304         if (unlikely(urb->status))
305                 warn("usblp%d: nonzero read/write bulk status received: %d",
306                         usblp->minor, urb->status);
307         usblp->wcomplete = 1;
308 unplug:
309         wake_up_interruptible(&usblp->wait);
310 }
311
312 /*
313  * Get and print printer errors.
314  */
315
316 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
317
318 static int usblp_check_status(struct usblp *usblp, int err)
319 {
320         unsigned char status, newerr = 0;
321         int error;
322
323         error = usblp_read_status (usblp, usblp->statusbuf);
324         if (error < 0) {
325                 if (printk_ratelimit())
326                         err("usblp%d: error %d reading printer status",
327                                 usblp->minor, error);
328                 return 0;
329         }
330
331         status = *usblp->statusbuf;
332
333         if (~status & LP_PERRORP)
334                 newerr = 3;
335         if (status & LP_POUTPA)
336                 newerr = 1;
337         if (~status & LP_PSELECD)
338                 newerr = 2;
339
340         if (newerr != err)
341                 info("usblp%d: %s", usblp->minor, usblp_messages[newerr]);
342
343         return newerr;
344 }
345
346 static int handle_bidir (struct usblp *usblp)
347 {
348         if (usblp->bidir && usblp->used && !usblp->sleeping) {
349                 usblp->readcount = 0;
350                 usblp->readurb->dev = usblp->dev;
351                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) {
352                         usblp->used = 0;
353                         return -EIO;
354                 }
355         }
356
357         return 0;
358 }
359
360 /*
361  * File op functions.
362  */
363
364 static int usblp_open(struct inode *inode, struct file *file)
365 {
366         int minor = iminor(inode);
367         struct usblp *usblp;
368         struct usb_interface *intf;
369         int retval;
370
371         if (minor < 0)
372                 return -ENODEV;
373
374         mutex_lock (&usblp_mutex);
375
376         retval = -ENODEV;
377         intf = usb_find_interface(&usblp_driver, minor);
378         if (!intf) {
379                 goto out;
380         }
381         usblp = usb_get_intfdata (intf);
382         if (!usblp || !usblp->dev || !usblp->present)
383                 goto out;
384
385         retval = -EBUSY;
386         if (usblp->used)
387                 goto out;
388
389         /*
390          * TODO: need to implement LP_ABORTOPEN + O_NONBLOCK as in drivers/char/lp.c ???
391          * This is #if 0-ed because we *don't* want to fail an open
392          * just because the printer is off-line.
393          */
394 #if 0
395         if ((retval = usblp_check_status(usblp, 0))) {
396                 retval = retval > 1 ? -EIO : -ENOSPC;
397                 goto out;
398         }
399 #else
400         retval = 0;
401 #endif
402
403         retval = usb_autopm_get_interface(intf);
404         if (retval < 0)
405                 goto out;
406         usblp->used = 1;
407         file->private_data = usblp;
408
409         usblp->writeurb->transfer_buffer_length = 0;
410         usblp->wcomplete = 1; /* we begin writeable */
411         usblp->rcomplete = 0;
412         usblp->writeurb->status = 0;
413         usblp->readurb->status = 0;
414
415         if (handle_bidir(usblp) < 0) {
416                 file->private_data = NULL;
417                 retval = -EIO;
418         }
419 out:
420         mutex_unlock (&usblp_mutex);
421         return retval;
422 }
423
424 static void usblp_cleanup (struct usblp *usblp)
425 {
426         info("usblp%d: removed", usblp->minor);
427
428         kfree (usblp->device_id_string);
429         kfree (usblp->statusbuf);
430         usb_free_urb(usblp->writeurb);
431         usb_free_urb(usblp->readurb);
432         kfree (usblp);
433 }
434
435 static void usblp_unlink_urbs(struct usblp *usblp)
436 {
437         usb_kill_urb(usblp->writeurb);
438         if (usblp->bidir)
439                 usb_kill_urb(usblp->readurb);
440 }
441
442 static int usblp_release(struct inode *inode, struct file *file)
443 {
444         struct usblp *usblp = file->private_data;
445
446         mutex_lock (&usblp_mutex);
447         usblp->used = 0;
448         if (usblp->present) {
449                 usblp_unlink_urbs(usblp);
450                 usb_autopm_put_interface(usblp->intf);
451         } else          /* finish cleanup from disconnect */
452                 usblp_cleanup (usblp);
453         mutex_unlock (&usblp_mutex);
454         return 0;
455 }
456
457 /* No kernel lock - fine */
458 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
459 {
460         struct usblp *usblp = file->private_data;
461         poll_wait(file, &usblp->wait, wait);
462         return ((!usblp->bidir || !usblp->rcomplete) ? 0 : POLLIN  | POLLRDNORM)
463                                | (!usblp->wcomplete ? 0 : POLLOUT | POLLWRNORM);
464 }
465
466 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
467 {
468         struct usblp *usblp = file->private_data;
469         int length, err, i;
470         unsigned char newChannel;
471         int status;
472         int twoints[2];
473         int retval = 0;
474
475         mutex_lock (&usblp->mut);
476         if (!usblp->present) {
477                 retval = -ENODEV;
478                 goto done;
479         }
480
481         if (usblp->sleeping) {
482                 retval = -ENODEV;
483                 goto done;
484         }
485
486         dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd),
487                 _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd) );
488
489         if (_IOC_TYPE(cmd) == 'P')      /* new-style ioctl number */
490
491                 switch (_IOC_NR(cmd)) {
492
493                         case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
494                                 if (_IOC_DIR(cmd) != _IOC_READ) {
495                                         retval = -EINVAL;
496                                         goto done;
497                                 }
498
499                                 length = usblp_cache_device_id_string(usblp);
500                                 if (length < 0) {
501                                         retval = length;
502                                         goto done;
503                                 }
504                                 if (length > _IOC_SIZE(cmd))
505                                         length = _IOC_SIZE(cmd); /* truncate */
506
507                                 if (copy_to_user((void __user *) arg,
508                                                 usblp->device_id_string,
509                                                 (unsigned long) length)) {
510                                         retval = -EFAULT;
511                                         goto done;
512                                 }
513
514                                 break;
515
516                         case IOCNR_GET_PROTOCOLS:
517                                 if (_IOC_DIR(cmd) != _IOC_READ ||
518                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
519                                         retval = -EINVAL;
520                                         goto done;
521                                 }
522
523                                 twoints[0] = usblp->current_protocol;
524                                 twoints[1] = 0;
525                                 for (i = USBLP_FIRST_PROTOCOL;
526                                      i <= USBLP_LAST_PROTOCOL; i++) {
527                                         if (usblp->protocol[i].alt_setting >= 0)
528                                                 twoints[1] |= (1<<i);
529                                 }
530
531                                 if (copy_to_user((void __user *)arg,
532                                                 (unsigned char *)twoints,
533                                                 sizeof(twoints))) {
534                                         retval = -EFAULT;
535                                         goto done;
536                                 }
537
538                                 break;
539
540                         case IOCNR_SET_PROTOCOL:
541                                 if (_IOC_DIR(cmd) != _IOC_WRITE) {
542                                         retval = -EINVAL;
543                                         goto done;
544                                 }
545
546 #ifdef DEBUG
547                                 if (arg == -10) {
548                                         usblp_dump(usblp);
549                                         break;
550                                 }
551 #endif
552
553                                 usblp_unlink_urbs(usblp);
554                                 retval = usblp_set_protocol(usblp, arg);
555                                 if (retval < 0) {
556                                         usblp_set_protocol(usblp,
557                                                 usblp->current_protocol);
558                                 }
559                                 break;
560
561                         case IOCNR_HP_SET_CHANNEL:
562                                 if (_IOC_DIR(cmd) != _IOC_WRITE ||
563                                     le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
564                                     usblp->quirks & USBLP_QUIRK_BIDIR) {
565                                         retval = -EINVAL;
566                                         goto done;
567                                 }
568
569                                 err = usblp_hp_channel_change_request(usblp,
570                                         arg, &newChannel);
571                                 if (err < 0) {
572                                         err("usblp%d: error = %d setting "
573                                                 "HP channel",
574                                                 usblp->minor, err);
575                                         retval = -EIO;
576                                         goto done;
577                                 }
578
579                                 dbg("usblp%d requested/got HP channel %ld/%d",
580                                         usblp->minor, arg, newChannel);
581                                 break;
582
583                         case IOCNR_GET_BUS_ADDRESS:
584                                 if (_IOC_DIR(cmd) != _IOC_READ ||
585                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
586                                         retval = -EINVAL;
587                                         goto done;
588                                 }
589
590                                 twoints[0] = usblp->dev->bus->busnum;
591                                 twoints[1] = usblp->dev->devnum;
592                                 if (copy_to_user((void __user *)arg,
593                                                 (unsigned char *)twoints,
594                                                 sizeof(twoints))) {
595                                         retval = -EFAULT;
596                                         goto done;
597                                 }
598
599                                 dbg("usblp%d is bus=%d, device=%d",
600                                         usblp->minor, twoints[0], twoints[1]);
601                                 break;
602
603                         case IOCNR_GET_VID_PID:
604                                 if (_IOC_DIR(cmd) != _IOC_READ ||
605                                     _IOC_SIZE(cmd) < sizeof(twoints)) {
606                                         retval = -EINVAL;
607                                         goto done;
608                                 }
609
610                                 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
611                                 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
612                                 if (copy_to_user((void __user *)arg,
613                                                 (unsigned char *)twoints,
614                                                 sizeof(twoints))) {
615                                         retval = -EFAULT;
616                                         goto done;
617                                 }
618
619                                 dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X",
620                                         usblp->minor, twoints[0], twoints[1]);
621                                 break;
622
623                         case IOCNR_SOFT_RESET:
624                                 if (_IOC_DIR(cmd) != _IOC_NONE) {
625                                         retval = -EINVAL;
626                                         goto done;
627                                 }
628                                 retval = usblp_reset(usblp);
629                                 break;
630                         default:
631                                 retval = -ENOTTY;
632                 }
633         else    /* old-style ioctl value */
634                 switch (cmd) {
635
636                         case LPGETSTATUS:
637                                 if (usblp_read_status(usblp, usblp->statusbuf)) {
638                                         if (printk_ratelimit())
639                                                 err("usblp%d: failed reading printer status",
640                                                         usblp->minor);
641                                         retval = -EIO;
642                                         goto done;
643                                 }
644                                 status = *usblp->statusbuf;
645                                 if (copy_to_user ((void __user *)arg, &status, sizeof(int)))
646                                         retval = -EFAULT;
647                                 break;
648
649                         default:
650                                 retval = -ENOTTY;
651                 }
652
653 done:
654         mutex_unlock (&usblp->mut);
655         return retval;
656 }
657
658 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
659 {
660         struct usblp *usblp = file->private_data;
661         int timeout, intr, rv, err = 0, transfer_length = 0;
662         size_t writecount = 0;
663
664         while (writecount < count) {
665                 if (!usblp->wcomplete) {
666                         barrier();
667                         if (file->f_flags & O_NONBLOCK) {
668                                 writecount += transfer_length;
669                                 return writecount ? writecount : -EAGAIN;
670                         }
671
672                         timeout = USBLP_WRITE_TIMEOUT;
673
674                         rv = wait_event_interruptible_timeout(usblp->wait, usblp->wcomplete || !usblp->present , timeout);
675                         if (rv < 0)
676                                 return writecount ? writecount : -EINTR;
677                 }
678                 intr = mutex_lock_interruptible (&usblp->mut);
679                 if (intr)
680                         return writecount ? writecount : -EINTR;
681                 if (!usblp->present) {
682                         mutex_unlock (&usblp->mut);
683                         return -ENODEV;
684                 }
685
686                 if (usblp->sleeping) {
687                         mutex_unlock (&usblp->mut);
688                         return writecount ? writecount : -ENODEV;
689                 }
690
691                 if (usblp->writeurb->status != 0) {
692                         if (usblp->quirks & USBLP_QUIRK_BIDIR) {
693                                 if (!usblp->wcomplete)
694                                         err("usblp%d: error %d writing to printer",
695                                                 usblp->minor, usblp->writeurb->status);
696                                 err = usblp->writeurb->status;
697                         } else
698                                 err = usblp_check_status(usblp, err);
699                         mutex_unlock (&usblp->mut);
700
701                         /* if the fault was due to disconnect, let khubd's
702                          * call to usblp_disconnect() grab usblp->mut ...
703                          */
704                         schedule ();
705                         continue;
706                 }
707
708                 /* We must increment writecount here, and not at the
709                  * end of the loop. Otherwise, the final loop iteration may
710                  * be skipped, leading to incomplete printer output.
711                  */
712                 writecount += transfer_length;
713                 if (writecount == count) {
714                         mutex_unlock(&usblp->mut);
715                         break;
716                 }
717
718                 transfer_length=(count - writecount);
719                 if (transfer_length > USBLP_BUF_SIZE)
720                         transfer_length = USBLP_BUF_SIZE;
721
722                 usblp->writeurb->transfer_buffer_length = transfer_length;
723
724                 if (copy_from_user(usblp->writeurb->transfer_buffer, 
725                                    buffer + writecount, transfer_length)) {
726                         mutex_unlock(&usblp->mut);
727                         return writecount ? writecount : -EFAULT;
728                 }
729
730                 usblp->writeurb->dev = usblp->dev;
731                 usblp->wcomplete = 0;
732                 err = usb_submit_urb(usblp->writeurb, GFP_KERNEL);
733                 if (err) {
734                         usblp->wcomplete = 1;
735                         if (err != -ENOMEM)
736                                 count = -EIO;
737                         else
738                                 count = writecount ? writecount : -ENOMEM;
739                         mutex_unlock (&usblp->mut);
740                         break;
741                 }
742                 mutex_unlock (&usblp->mut);
743         }
744
745         return count;
746 }
747
748 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
749 {
750         struct usblp *usblp = file->private_data;
751         int rv, intr;
752
753         if (!usblp->bidir)
754                 return -EINVAL;
755
756         intr = mutex_lock_interruptible (&usblp->mut);
757         if (intr)
758                 return -EINTR;
759         if (!usblp->present) {
760                 count = -ENODEV;
761                 goto done;
762         }
763
764         if (!usblp->rcomplete) {
765                 barrier();
766
767                 if (file->f_flags & O_NONBLOCK) {
768                         count = -EAGAIN;
769                         goto done;
770                 }
771                 mutex_unlock(&usblp->mut);
772                 rv = wait_event_interruptible(usblp->wait, usblp->rcomplete || !usblp->present);
773                 mutex_lock(&usblp->mut);
774                 if (rv < 0) {
775                         count = -EINTR;
776                         goto done;
777                 }
778         }
779
780         if (!usblp->present) {
781                 count = -ENODEV;
782                 goto done;
783         }
784
785         if (usblp->sleeping) {
786                 count = -ENODEV;
787                 goto done;
788         }
789
790         if (usblp->readurb->status) {
791                 err("usblp%d: error %d reading from printer",
792                         usblp->minor, usblp->readurb->status);
793                 usblp->readurb->dev = usblp->dev;
794                 usblp->readcount = 0;
795                 usblp->rcomplete = 0;
796                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0)
797                         dbg("error submitting urb");
798                 count = -EIO;
799                 goto done;
800         }
801
802         count = count < usblp->readurb->actual_length - usblp->readcount ?
803                 count : usblp->readurb->actual_length - usblp->readcount;
804
805         if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) {
806                 count = -EFAULT;
807                 goto done;
808         }
809
810         if ((usblp->readcount += count) == usblp->readurb->actual_length) {
811                 usblp->readcount = 0;
812                 usblp->readurb->dev = usblp->dev;
813                 usblp->rcomplete = 0;
814                 if (usb_submit_urb(usblp->readurb, GFP_KERNEL)) {
815                         count = -EIO;
816                         goto done;
817                 }
818         }
819
820 done:
821         mutex_unlock (&usblp->mut);
822         return count;
823 }
824
825 /*
826  * Checks for printers that have quirks, such as requiring unidirectional
827  * communication but reporting bidirectional; currently some HP printers
828  * have this flaw (HP 810, 880, 895, etc.), or needing an init string
829  * sent at each open (like some Epsons).
830  * Returns 1 if found, 0 if not found.
831  *
832  * HP recommended that we use the bidirectional interface but
833  * don't attempt any bulk IN transfers from the IN endpoint.
834  * Here's some more detail on the problem:
835  * The problem is not that it isn't bidirectional though. The problem
836  * is that if you request a device ID, or status information, while
837  * the buffers are full, the return data will end up in the print data
838  * buffer. For example if you make sure you never request the device ID
839  * while you are sending print data, and you don't try to query the
840  * printer status every couple of milliseconds, you will probably be OK.
841  */
842 static unsigned int usblp_quirks (__u16 vendor, __u16 product)
843 {
844         int i;
845
846         for (i = 0; quirk_printers[i].vendorId; i++) {
847                 if (vendor == quirk_printers[i].vendorId &&
848                     product == quirk_printers[i].productId)
849                         return quirk_printers[i].quirks;
850         }
851         return 0;
852 }
853
854 static const struct file_operations usblp_fops = {
855         .owner =        THIS_MODULE,
856         .read =         usblp_read,
857         .write =        usblp_write,
858         .poll =         usblp_poll,
859         .unlocked_ioctl =       usblp_ioctl,
860         .compat_ioctl =         usblp_ioctl,
861         .open =         usblp_open,
862         .release =      usblp_release,
863 };
864
865 static struct usb_class_driver usblp_class = {
866         .name =         "lp%d",
867         .fops =         &usblp_fops,
868         .minor_base =   USBLP_MINOR_BASE,
869 };
870
871 static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf)
872 {
873         struct usb_interface *intf = to_usb_interface(dev);
874         struct usblp *usblp = usb_get_intfdata (intf);
875
876         if (usblp->device_id_string[0] == 0 &&
877             usblp->device_id_string[1] == 0)
878                 return 0;
879
880         return sprintf(buf, "%s", usblp->device_id_string+2);
881 }
882
883 static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL);
884
885 static int usblp_probe(struct usb_interface *intf,
886                        const struct usb_device_id *id)
887 {
888         struct usb_device *dev = interface_to_usbdev (intf);
889         struct usblp *usblp = NULL;
890         int protocol;
891         int retval;
892
893         /* Malloc and start initializing usblp structure so we can use it
894          * directly. */
895         if (!(usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL))) {
896                 err("out of memory for usblp");
897                 goto abort;
898         }
899         usblp->dev = dev;
900         mutex_init (&usblp->mut);
901         init_waitqueue_head(&usblp->wait);
902         usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
903         usblp->intf = intf;
904
905         usblp->writeurb = usb_alloc_urb(0, GFP_KERNEL);
906         if (!usblp->writeurb) {
907                 err("out of memory");
908                 goto abort;
909         }
910         usblp->readurb = usb_alloc_urb(0, GFP_KERNEL);
911         if (!usblp->readurb) {
912                 err("out of memory");
913                 goto abort;
914         }
915
916         /* Malloc device ID string buffer to the largest expected length,
917          * since we can re-query it on an ioctl and a dynamic string
918          * could change in length. */
919         if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
920                 err("out of memory for device_id_string");
921                 goto abort;
922         }
923
924         usblp->writebuf = usblp->readbuf = NULL;
925         usblp->writeurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
926         usblp->readurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
927         /* Malloc write & read buffers.  We somewhat wastefully
928          * malloc both regardless of bidirectionality, because the
929          * alternate setting can be changed later via an ioctl. */
930         if (!(usblp->writebuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
931                                 GFP_KERNEL, &usblp->writeurb->transfer_dma))) {
932                 err("out of memory for write buf");
933                 goto abort;
934         }
935         if (!(usblp->readbuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
936                                 GFP_KERNEL, &usblp->readurb->transfer_dma))) {
937                 err("out of memory for read buf");
938                 goto abort;
939         }
940
941         /* Allocate buffer for printer status */
942         usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
943         if (!usblp->statusbuf) {
944                 err("out of memory for statusbuf");
945                 goto abort;
946         }
947
948         /* Lookup quirks for this printer. */
949         usblp->quirks = usblp_quirks(
950                 le16_to_cpu(dev->descriptor.idVendor),
951                 le16_to_cpu(dev->descriptor.idProduct));
952
953         /* Analyze and pick initial alternate settings and endpoints. */
954         protocol = usblp_select_alts(usblp);
955         if (protocol < 0) {
956                 dbg("incompatible printer-class device 0x%4.4X/0x%4.4X",
957                         le16_to_cpu(dev->descriptor.idVendor),
958                         le16_to_cpu(dev->descriptor.idProduct));
959                 goto abort;
960         }
961
962         /* Setup the selected alternate setting and endpoints. */
963         if (usblp_set_protocol(usblp, protocol) < 0)
964                 goto abort;
965
966         /* Retrieve and store the device ID string. */
967         usblp_cache_device_id_string(usblp);
968         retval = device_create_file(&intf->dev, &dev_attr_ieee1284_id);
969         if (retval)
970                 goto abort_intfdata;
971
972 #ifdef DEBUG
973         usblp_check_status(usblp, 0);
974 #endif
975
976         usb_set_intfdata (intf, usblp);
977
978         usblp->present = 1;
979
980         retval = usb_register_dev(intf, &usblp_class);
981         if (retval) {
982                 err("Not able to get a minor for this device.");
983                 goto abort_intfdata;
984         }
985         usblp->minor = intf->minor;
986         info("usblp%d: USB %sdirectional printer dev %d "
987                 "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X",
988                 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
989                 usblp->ifnum,
990                 usblp->protocol[usblp->current_protocol].alt_setting,
991                 usblp->current_protocol,
992                 le16_to_cpu(usblp->dev->descriptor.idVendor),
993                 le16_to_cpu(usblp->dev->descriptor.idProduct));
994
995         return 0;
996
997 abort_intfdata:
998         usb_set_intfdata (intf, NULL);
999         device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1000 abort:
1001         if (usblp) {
1002                 if (usblp->writebuf)
1003                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1004                                 usblp->writebuf, usblp->writeurb->transfer_dma);
1005                 if (usblp->readbuf)
1006                         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1007                                 usblp->readbuf, usblp->writeurb->transfer_dma);
1008                 kfree(usblp->statusbuf);
1009                 kfree(usblp->device_id_string);
1010                 usb_free_urb(usblp->writeurb);
1011                 usb_free_urb(usblp->readurb);
1012                 kfree(usblp);
1013         }
1014         return -EIO;
1015 }
1016
1017 /*
1018  * We are a "new" style driver with usb_device_id table,
1019  * but our requirements are too intricate for simple match to handle.
1020  *
1021  * The "proto_bias" option may be used to specify the preferred protocol
1022  * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3).  If the device
1023  * supports the preferred protocol, then we bind to it.
1024  *
1025  * The best interface for us is 7/1/2, because it is compatible
1026  * with a stream of characters. If we find it, we bind to it.
1027  *
1028  * Note that the people from hpoj.sourceforge.net need to be able to
1029  * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
1030  *
1031  * Failing 7/1/2, we look for 7/1/3, even though it's probably not
1032  * stream-compatible, because this matches the behaviour of the old code.
1033  *
1034  * If nothing else, we bind to 7/1/1 - the unidirectional interface.
1035  */
1036 static int usblp_select_alts(struct usblp *usblp)
1037 {
1038         struct usb_interface *if_alt;
1039         struct usb_host_interface *ifd;
1040         struct usb_endpoint_descriptor *epd, *epwrite, *epread;
1041         int p, i, e;
1042
1043         if_alt = usblp->intf;
1044
1045         for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1046                 usblp->protocol[p].alt_setting = -1;
1047
1048         /* Find out what we have. */
1049         for (i = 0; i < if_alt->num_altsetting; i++) {
1050                 ifd = &if_alt->altsetting[i];
1051
1052                 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
1053                         if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS))
1054                                 continue;
1055
1056                 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1057                     ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1058                         continue;
1059
1060                 /* Look for bulk OUT and IN endpoints. */
1061                 epwrite = epread = NULL;
1062                 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1063                         epd = &ifd->endpoint[e].desc;
1064
1065                         if (usb_endpoint_is_bulk_out(epd))
1066                                 if (!epwrite)
1067                                         epwrite = epd;
1068
1069                         if (usb_endpoint_is_bulk_in(epd))
1070                                 if (!epread)
1071                                         epread = epd;
1072                 }
1073
1074                 /* Ignore buggy hardware without the right endpoints. */
1075                 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1076                         continue;
1077
1078                 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1079                  * and buggy bidirectional printers. */
1080                 if (ifd->desc.bInterfaceProtocol == 1) {
1081                         epread = NULL;
1082                 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1083                         info("Disabling reads from problem bidirectional "
1084                                 "printer on usblp%d", usblp->minor);
1085                         epread = NULL;
1086                 }
1087
1088                 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1089                                 ifd->desc.bAlternateSetting;
1090                 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1091                 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1092         }
1093
1094         /* If our requested protocol is supported, then use it. */
1095         if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1096             proto_bias <= USBLP_LAST_PROTOCOL &&
1097             usblp->protocol[proto_bias].alt_setting != -1)
1098                 return proto_bias;
1099
1100         /* Ordering is important here. */
1101         if (usblp->protocol[2].alt_setting != -1)
1102                 return 2;
1103         if (usblp->protocol[1].alt_setting != -1)
1104                 return 1;
1105         if (usblp->protocol[3].alt_setting != -1)
1106                 return 3;
1107
1108         /* If nothing is available, then don't bind to this device. */
1109         return -1;
1110 }
1111
1112 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1113 {
1114         int r, alts;
1115
1116         if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1117                 return -EINVAL;
1118
1119         alts = usblp->protocol[protocol].alt_setting;
1120         if (alts < 0)
1121                 return -EINVAL;
1122         r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1123         if (r < 0) {
1124                 err("can't set desired altsetting %d on interface %d",
1125                         alts, usblp->ifnum);
1126                 return r;
1127         }
1128
1129         usb_fill_bulk_urb(usblp->writeurb, usblp->dev,
1130                 usb_sndbulkpipe(usblp->dev,
1131                   usblp->protocol[protocol].epwrite->bEndpointAddress),
1132                 usblp->writebuf, 0,
1133                 usblp_bulk_write, usblp);
1134
1135         usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1136         if (usblp->bidir)
1137                 usb_fill_bulk_urb(usblp->readurb, usblp->dev,
1138                         usb_rcvbulkpipe(usblp->dev,
1139                           usblp->protocol[protocol].epread->bEndpointAddress),
1140                         usblp->readbuf, USBLP_BUF_SIZE,
1141                         usblp_bulk_read, usblp);
1142
1143         usblp->current_protocol = protocol;
1144         dbg("usblp%d set protocol %d", usblp->minor, protocol);
1145         return 0;
1146 }
1147
1148 /* Retrieves and caches device ID string.
1149  * Returns length, including length bytes but not null terminator.
1150  * On error, returns a negative errno value. */
1151 static int usblp_cache_device_id_string(struct usblp *usblp)
1152 {
1153         int err, length;
1154
1155         err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1156         if (err < 0) {
1157                 dbg("usblp%d: error = %d reading IEEE-1284 Device ID string",
1158                         usblp->minor, err);
1159                 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1160                 return -EIO;
1161         }
1162
1163         /* First two bytes are length in big-endian.
1164          * They count themselves, and we copy them into
1165          * the user's buffer. */
1166         length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1167         if (length < 2)
1168                 length = 2;
1169         else if (length >= USBLP_DEVICE_ID_SIZE)
1170                 length = USBLP_DEVICE_ID_SIZE - 1;
1171         usblp->device_id_string[length] = '\0';
1172
1173         dbg("usblp%d Device ID string [len=%d]=\"%s\"",
1174                 usblp->minor, length, &usblp->device_id_string[2]);
1175
1176         return length;
1177 }
1178
1179 static void usblp_disconnect(struct usb_interface *intf)
1180 {
1181         struct usblp *usblp = usb_get_intfdata (intf);
1182
1183         usb_deregister_dev(intf, &usblp_class);
1184
1185         if (!usblp || !usblp->dev) {
1186                 err("bogus disconnect");
1187                 BUG ();
1188         }
1189
1190         device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1191
1192         mutex_lock (&usblp_mutex);
1193         mutex_lock (&usblp->mut);
1194         usblp->present = 0;
1195         usb_set_intfdata (intf, NULL);
1196
1197         usblp_unlink_urbs(usblp);
1198         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1199                         usblp->writebuf, usblp->writeurb->transfer_dma);
1200         usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1201                         usblp->readbuf, usblp->readurb->transfer_dma);
1202         mutex_unlock (&usblp->mut);
1203
1204         if (!usblp->used)
1205                 usblp_cleanup (usblp);
1206         mutex_unlock (&usblp_mutex);
1207 }
1208
1209 static int usblp_suspend (struct usb_interface *intf, pm_message_t message)
1210 {
1211         struct usblp *usblp = usb_get_intfdata (intf);
1212
1213         /* we take no more IO */
1214         usblp->sleeping = 1;
1215         usblp_unlink_urbs(usblp);
1216
1217         return 0;
1218 }
1219
1220 static int usblp_resume (struct usb_interface *intf)
1221 {
1222         struct usblp *usblp = usb_get_intfdata (intf);
1223         int r;
1224
1225         usblp->sleeping = 0;
1226         r = handle_bidir (usblp);
1227
1228         return r;
1229 }
1230
1231 static struct usb_device_id usblp_ids [] = {
1232         { USB_DEVICE_INFO(7, 1, 1) },
1233         { USB_DEVICE_INFO(7, 1, 2) },
1234         { USB_DEVICE_INFO(7, 1, 3) },
1235         { USB_INTERFACE_INFO(7, 1, 1) },
1236         { USB_INTERFACE_INFO(7, 1, 2) },
1237         { USB_INTERFACE_INFO(7, 1, 3) },
1238         { USB_DEVICE(0x04b8, 0x0202) }, /* Seiko Epson Receipt Printer M129C */
1239         { }                                             /* Terminating entry */
1240 };
1241
1242 MODULE_DEVICE_TABLE (usb, usblp_ids);
1243
1244 static struct usb_driver usblp_driver = {
1245         .name =         "usblp",
1246         .probe =        usblp_probe,
1247         .disconnect =   usblp_disconnect,
1248         .suspend =      usblp_suspend,
1249         .resume =       usblp_resume,
1250         .id_table =     usblp_ids,
1251         .supports_autosuspend = 1,
1252 };
1253
1254 static int __init usblp_init(void)
1255 {
1256         int retval;
1257         retval = usb_register(&usblp_driver);
1258         if (!retval)
1259                 info(DRIVER_VERSION ": " DRIVER_DESC);
1260
1261         return retval;
1262 }
1263
1264 static void __exit usblp_exit(void)
1265 {
1266         usb_deregister(&usblp_driver);
1267 }
1268
1269 module_init(usblp_init);
1270 module_exit(usblp_exit);
1271
1272 MODULE_AUTHOR( DRIVER_AUTHOR );
1273 MODULE_DESCRIPTION( DRIVER_DESC );
1274 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1275 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1276 MODULE_LICENSE("GPL");