header cleaning: don't include smp_lock.h when not used
[linux-3.10.git] / 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/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");