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Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[wrt350n-kernel.git] / drivers / usb / class / usblp.c
blobb92647f62ec1ed98f1d72dfc233167653eae7bba
1 /*
2 * usblp.c
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 * none - Maintained in Linux kernel after v0.13
32 */
33
34 /*
35 * This program is free software; you can redistribute it and/or modify
36 * it under the terms of the GNU General Public License as published by
37 * the Free Software Foundation; either version 2 of the License, or
38 * (at your option) any later version.
39 *
40 * This program is distributed in the hope that it will be useful,
41 * but WITHOUT ANY WARRANTY; without even the implied warranty of
42 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
43 * GNU General Public License for more details.
44 *
45 * You should have received a copy of the GNU General Public License
46 * along with this program; if not, write to the Free Software
47 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
48 */
49
50 #include <linux/module.h>
51 #include <linux/kernel.h>
52 #include <linux/sched.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_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_BUF_SIZE_IN 1024
70 #define USBLP_DEVICE_ID_SIZE 1024
71
72 /* ioctls: */
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_CTL_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 /*
131 * Locks down the locking order:
132 * ->wmut locks wstatus.
133 * ->mut locks the whole usblp, except [rw]complete, and thus, by indirection,
134 * [rw]status. We only touch status when we know the side idle.
135 * ->lock locks what interrupt accesses.
136 */
137 struct usblp {
138 struct usb_device *dev; /* USB device */
139 struct mutex wmut;
140 struct mutex mut;
141 spinlock_t lock; /* locks rcomplete, wcomplete */
142 char *readbuf; /* read transfer_buffer */
143 char *statusbuf; /* status transfer_buffer */
144 struct usb_anchor urbs;
145 wait_queue_head_t rwait, wwait;
146 int readcount; /* Counter for reads */
147 int ifnum; /* Interface number */
148 struct usb_interface *intf; /* The interface */
149 /* Alternate-setting numbers and endpoints for each protocol
150 * (7/1/{index=1,2,3}) that the device supports: */
151 struct {
152 int alt_setting;
153 struct usb_endpoint_descriptor *epwrite;
154 struct usb_endpoint_descriptor *epread;
155 } protocol[USBLP_MAX_PROTOCOLS];
156 int current_protocol;
157 int minor; /* minor number of device */
158 int wcomplete, rcomplete;
159 int wstatus; /* bytes written or error */
160 int rstatus; /* bytes ready or error */
161 unsigned int quirks; /* quirks flags */
162 unsigned int flags; /* mode flags */
163 unsigned char used; /* True if open */
164 unsigned char present; /* True if not disconnected */
165 unsigned char bidir; /* interface is bidirectional */
166 unsigned char sleeping; /* interface is suspended */
167 unsigned char no_paper; /* Paper Out happened */
168 unsigned char *device_id_string; /* IEEE 1284 DEVICE ID string (ptr) */
169 /* first 2 bytes are (big-endian) length */
170 };
171
172 #ifdef DEBUG
173 static void usblp_dump(struct usblp *usblp) {
174 int p;
175
176 dbg("usblp=0x%p", usblp);
177 dbg("dev=0x%p", usblp->dev);
178 dbg("present=%d", usblp->present);
179 dbg("readbuf=0x%p", usblp->readbuf);
180 dbg("readcount=%d", usblp->readcount);
181 dbg("ifnum=%d", usblp->ifnum);
182 for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
183 dbg("protocol[%d].alt_setting=%d", p, usblp->protocol[p].alt_setting);
184 dbg("protocol[%d].epwrite=%p", p, usblp->protocol[p].epwrite);
185 dbg("protocol[%d].epread=%p", p, usblp->protocol[p].epread);
186 }
187 dbg("current_protocol=%d", usblp->current_protocol);
188 dbg("minor=%d", usblp->minor);
189 dbg("wstatus=%d", usblp->wstatus);
190 dbg("rstatus=%d", usblp->rstatus);
191 dbg("quirks=%d", usblp->quirks);
192 dbg("used=%d", usblp->used);
193 dbg("bidir=%d", usblp->bidir);
194 dbg("sleeping=%d", usblp->sleeping);
195 dbg("device_id_string=\"%s\"",
196 usblp->device_id_string ?
197 usblp->device_id_string + 2 :
198 (unsigned char *)"(null)");
199 }
200 #endif
201
202 /* Quirks: various printer quirks are handled by this table & its flags. */
203
204 struct quirk_printer_struct {
205 __u16 vendorId;
206 __u16 productId;
207 unsigned int quirks;
208 };
209
210 #define USBLP_QUIRK_BIDIR 0x1 /* reports bidir but requires unidirectional mode (no INs/reads) */
211 #define USBLP_QUIRK_USB_INIT 0x2 /* needs vendor USB init string */
212 #define USBLP_QUIRK_BAD_CLASS 0x4 /* descriptor uses vendor-specific Class or SubClass */
213
214 static const struct quirk_printer_struct quirk_printers[] = {
215 { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
216 { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
217 { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
218 { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
219 { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
220 { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
221 { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */
222 { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */
223 { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
224 { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
225 { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
226 { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
227 { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
228 { 0x0482, 0x0010, USBLP_QUIRK_BIDIR }, /* Kyocera Mita FS 820, by zut <kernel@zut.de> */
229 { 0x04b8, 0x0202, USBLP_QUIRK_BAD_CLASS }, /* Seiko Epson Receipt Printer M129C */
230 { 0, 0 }
231 };
232
233 static int usblp_wwait(struct usblp *usblp, int nonblock);
234 static int usblp_wtest(struct usblp *usblp, int nonblock);
235 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock);
236 static int usblp_rtest(struct usblp *usblp, int nonblock);
237 static int usblp_submit_read(struct usblp *usblp);
238 static int usblp_select_alts(struct usblp *usblp);
239 static int usblp_set_protocol(struct usblp *usblp, int protocol);
240 static int usblp_cache_device_id_string(struct usblp *usblp);
241
242 /* forward reference to make our lives easier */
243 static struct usb_driver usblp_driver;
244 static DEFINE_MUTEX(usblp_mutex); /* locks the existence of usblp's */
245
246 /*
247 * Functions for usblp control messages.
248 */
249
250 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
251 {
252 int retval;
253 int index = usblp->ifnum;
254
255 /* High byte has the interface index.
256 Low byte has the alternate setting.
257 */
258 if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) {
259 index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
260 }
261
262 retval = usb_control_msg(usblp->dev,
263 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
264 request, type | dir | recip, value, index, buf, len, USBLP_CTL_TIMEOUT);
265 dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d",
266 request, !!dir, recip, value, index, len, retval);
267 return retval < 0 ? retval : 0;
268 }
269
270 #define usblp_read_status(usblp, status)\
271 usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
272 #define usblp_get_id(usblp, config, id, maxlen)\
273 usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
274 #define usblp_reset(usblp)\
275 usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
276
277 #define usblp_hp_channel_change_request(usblp, channel, buffer) \
278 usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
279
280 /*
281 * See the description for usblp_select_alts() below for the usage
282 * explanation. Look into your /proc/bus/usb/devices and dmesg in
283 * case of any trouble.
284 */
285 static int proto_bias = -1;
286
287 /*
288 * URB callback.
289 */
290
291 static void usblp_bulk_read(struct urb *urb)
292 {
293 struct usblp *usblp = urb->context;
294 int status = urb->status;
295
296 if (usblp->present && usblp->used) {
297 if (status)
298 printk(KERN_WARNING "usblp%d: "
299 "nonzero read bulk status received: %d\n",
300 usblp->minor, status);
301 }
302 spin_lock(&usblp->lock);
303 if (status < 0)
304 usblp->rstatus = status;
305 else
306 usblp->rstatus = urb->actual_length;
307 usblp->rcomplete = 1;
308 wake_up(&usblp->rwait);
309 spin_unlock(&usblp->lock);
310
311 usb_free_urb(urb);
312 }
313
314 static void usblp_bulk_write(struct urb *urb)
315 {
316 struct usblp *usblp = urb->context;
317 int status = urb->status;
318
319 if (usblp->present && usblp->used) {
320 if (status)
321 printk(KERN_WARNING "usblp%d: "
322 "nonzero write bulk status received: %d\n",
323 usblp->minor, status);
324 }
325 spin_lock(&usblp->lock);
326 if (status < 0)
327 usblp->wstatus = status;
328 else
329 usblp->wstatus = urb->actual_length;
330 usblp->no_paper = 0;
331 usblp->wcomplete = 1;
332 wake_up(&usblp->wwait);
333 spin_unlock(&usblp->lock);
334
335 usb_free_urb(urb);
336 }
337
338 /*
339 * Get and print printer errors.
340 */
341
342 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
343
344 static int usblp_check_status(struct usblp *usblp, int err)
345 {
346 unsigned char status, newerr = 0;
347 int error;
348
349 mutex_lock(&usblp->mut);
350 if ((error = usblp_read_status(usblp, usblp->statusbuf)) < 0) {
351 mutex_unlock(&usblp->mut);
352 if (printk_ratelimit())
353 printk(KERN_ERR
354 "usblp%d: error %d reading printer status\n",
355 usblp->minor, error);
356 return 0;
357 }
358 status = *usblp->statusbuf;
359 mutex_unlock(&usblp->mut);
360
361 if (~status & LP_PERRORP)
362 newerr = 3;
363 if (status & LP_POUTPA)
364 newerr = 1;
365 if (~status & LP_PSELECD)
366 newerr = 2;
367
368 if (newerr != err) {
369 printk(KERN_INFO "usblp%d: %s\n",
370 usblp->minor, usblp_messages[newerr]);
371 }
372
373 return newerr;
374 }
375
376 static int handle_bidir (struct usblp *usblp)
377 {
378 if (usblp->bidir && usblp->used && !usblp->sleeping) {
379 if (usblp_submit_read(usblp) < 0)
380 return -EIO;
381 }
382 return 0;
383 }
384
385 /*
386 * File op functions.
387 */
388
389 static int usblp_open(struct inode *inode, struct file *file)
390 {
391 int minor = iminor(inode);
392 struct usblp *usblp;
393 struct usb_interface *intf;
394 int retval;
395
396 if (minor < 0)
397 return -ENODEV;
398
399 mutex_lock (&usblp_mutex);
400
401 retval = -ENODEV;
402 intf = usb_find_interface(&usblp_driver, minor);
403 if (!intf) {
404 goto out;
405 }
406 usblp = usb_get_intfdata (intf);
407 if (!usblp || !usblp->dev || !usblp->present)
408 goto out;
409
410 retval = -EBUSY;
411 if (usblp->used)
412 goto out;
413
414 /*
415 * We do not implement LP_ABORTOPEN/LPABORTOPEN for two reasons:
416 * - We do not want persistent state which close(2) does not clear
417 * - It is not used anyway, according to CUPS people
418 */
419
420 retval = usb_autopm_get_interface(intf);
421 if (retval < 0)
422 goto out;
423 usblp->used = 1;
424 file->private_data = usblp;
425
426 usblp->wcomplete = 1; /* we begin writeable */
427 usblp->wstatus = 0;
428 usblp->rcomplete = 0;
429
430 if (handle_bidir(usblp) < 0) {
431 <<<<<<< HEAD:drivers/usb/class/usblp.c
432 =======
433 usb_autopm_put_interface(intf);
434 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/usb/class/usblp.c
435 usblp->used = 0;
436 file->private_data = NULL;
437 retval = -EIO;
438 }
439 out:
440 mutex_unlock (&usblp_mutex);
441 return retval;
442 }
443
444 static void usblp_cleanup (struct usblp *usblp)
445 {
446 printk(KERN_INFO "usblp%d: removed\n", usblp->minor);
447
448 kfree(usblp->readbuf);
449 kfree (usblp->device_id_string);
450 kfree (usblp->statusbuf);
451 kfree (usblp);
452 }
453
454 static void usblp_unlink_urbs(struct usblp *usblp)
455 {
456 usb_kill_anchored_urbs(&usblp->urbs);
457 }
458
459 static int usblp_release(struct inode *inode, struct file *file)
460 {
461 struct usblp *usblp = file->private_data;
462
463 usblp->flags &= ~LP_ABORT;
464
465 mutex_lock (&usblp_mutex);
466 usblp->used = 0;
467 if (usblp->present) {
468 usblp_unlink_urbs(usblp);
469 usb_autopm_put_interface(usblp->intf);
470 } else /* finish cleanup from disconnect */
471 usblp_cleanup (usblp);
472 mutex_unlock (&usblp_mutex);
473 return 0;
474 }
475
476 /* No kernel lock - fine */
477 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
478 {
479 int ret;
480 unsigned long flags;
481
482 struct usblp *usblp = file->private_data;
483 /* Should we check file->f_mode & FMODE_WRITE before poll_wait()? */
484 poll_wait(file, &usblp->rwait, wait);
485 poll_wait(file, &usblp->wwait, wait);
486 spin_lock_irqsave(&usblp->lock, flags);
487 ret = ((usblp->bidir && usblp->rcomplete) ? POLLIN | POLLRDNORM : 0) |
488 ((usblp->no_paper || usblp->wcomplete) ? POLLOUT | POLLWRNORM : 0);
489 spin_unlock_irqrestore(&usblp->lock, flags);
490 return ret;
491 }
492
493 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
494 {
495 struct usblp *usblp = file->private_data;
496 int length, err, i;
497 unsigned char newChannel;
498 int status;
499 int twoints[2];
500 int retval = 0;
501
502 mutex_lock (&usblp->mut);
503 if (!usblp->present) {
504 retval = -ENODEV;
505 goto done;
506 }
507
508 if (usblp->sleeping) {
509 retval = -ENODEV;
510 goto done;
511 }
512
513 dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd),
514 _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd) );
515
516 if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */
517
518 switch (_IOC_NR(cmd)) {
519
520 case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
521 if (_IOC_DIR(cmd) != _IOC_READ) {
522 retval = -EINVAL;
523 goto done;
524 }
525
526 length = usblp_cache_device_id_string(usblp);
527 if (length < 0) {
528 retval = length;
529 goto done;
530 }
531 if (length > _IOC_SIZE(cmd))
532 length = _IOC_SIZE(cmd); /* truncate */
533
534 if (copy_to_user((void __user *) arg,
535 usblp->device_id_string,
536 (unsigned long) length)) {
537 retval = -EFAULT;
538 goto done;
539 }
540
541 break;
542
543 case IOCNR_GET_PROTOCOLS:
544 if (_IOC_DIR(cmd) != _IOC_READ ||
545 _IOC_SIZE(cmd) < sizeof(twoints)) {
546 retval = -EINVAL;
547 goto done;
548 }
549
550 twoints[0] = usblp->current_protocol;
551 twoints[1] = 0;
552 for (i = USBLP_FIRST_PROTOCOL;
553 i <= USBLP_LAST_PROTOCOL; i++) {
554 if (usblp->protocol[i].alt_setting >= 0)
555 twoints[1] |= (1<<i);
556 }
557
558 if (copy_to_user((void __user *)arg,
559 (unsigned char *)twoints,
560 sizeof(twoints))) {
561 retval = -EFAULT;
562 goto done;
563 }
564
565 break;
566
567 case IOCNR_SET_PROTOCOL:
568 if (_IOC_DIR(cmd) != _IOC_WRITE) {
569 retval = -EINVAL;
570 goto done;
571 }
572
573 #ifdef DEBUG
574 if (arg == -10) {
575 usblp_dump(usblp);
576 break;
577 }
578 #endif
579
580 usblp_unlink_urbs(usblp);
581 retval = usblp_set_protocol(usblp, arg);
582 if (retval < 0) {
583 usblp_set_protocol(usblp,
584 usblp->current_protocol);
585 }
586 break;
587
588 case IOCNR_HP_SET_CHANNEL:
589 if (_IOC_DIR(cmd) != _IOC_WRITE ||
590 le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
591 usblp->quirks & USBLP_QUIRK_BIDIR) {
592 retval = -EINVAL;
593 goto done;
594 }
595
596 err = usblp_hp_channel_change_request(usblp,
597 arg, &newChannel);
598 if (err < 0) {
599 err("usblp%d: error = %d setting "
600 "HP channel",
601 usblp->minor, err);
602 retval = -EIO;
603 goto done;
604 }
605
606 dbg("usblp%d requested/got HP channel %ld/%d",
607 usblp->minor, arg, newChannel);
608 break;
609
610 case IOCNR_GET_BUS_ADDRESS:
611 if (_IOC_DIR(cmd) != _IOC_READ ||
612 _IOC_SIZE(cmd) < sizeof(twoints)) {
613 retval = -EINVAL;
614 goto done;
615 }
616
617 twoints[0] = usblp->dev->bus->busnum;
618 twoints[1] = usblp->dev->devnum;
619 if (copy_to_user((void __user *)arg,
620 (unsigned char *)twoints,
621 sizeof(twoints))) {
622 retval = -EFAULT;
623 goto done;
624 }
625
626 dbg("usblp%d is bus=%d, device=%d",
627 usblp->minor, twoints[0], twoints[1]);
628 break;
629
630 case IOCNR_GET_VID_PID:
631 if (_IOC_DIR(cmd) != _IOC_READ ||
632 _IOC_SIZE(cmd) < sizeof(twoints)) {
633 retval = -EINVAL;
634 goto done;
635 }
636
637 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
638 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
639 if (copy_to_user((void __user *)arg,
640 (unsigned char *)twoints,
641 sizeof(twoints))) {
642 retval = -EFAULT;
643 goto done;
644 }
645
646 dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X",
647 usblp->minor, twoints[0], twoints[1]);
648 break;
649
650 case IOCNR_SOFT_RESET:
651 if (_IOC_DIR(cmd) != _IOC_NONE) {
652 retval = -EINVAL;
653 goto done;
654 }
655 retval = usblp_reset(usblp);
656 break;
657 default:
658 retval = -ENOTTY;
659 }
660 else /* old-style ioctl value */
661 switch (cmd) {
662
663 case LPGETSTATUS:
664 if ((retval = usblp_read_status(usblp, usblp->statusbuf))) {
665 if (printk_ratelimit())
666 printk(KERN_ERR "usblp%d:"
667 "failed reading printer status (%d)\n",
668 usblp->minor, retval);
669 retval = -EIO;
670 goto done;
671 }
672 status = *usblp->statusbuf;
673 if (copy_to_user ((void __user *)arg, &status, sizeof(int)))
674 retval = -EFAULT;
675 break;
676
677 case LPABORT:
678 if (arg)
679 usblp->flags |= LP_ABORT;
680 else
681 usblp->flags &= ~LP_ABORT;
682 break;
683
684 default:
685 retval = -ENOTTY;
686 }
687
688 done:
689 mutex_unlock (&usblp->mut);
690 return retval;
691 }
692
693 static struct urb *usblp_new_writeurb(struct usblp *usblp, int transfer_length)
694 {
695 struct urb *urb;
696 char *writebuf;
697
698 if ((writebuf = kmalloc(transfer_length, GFP_KERNEL)) == NULL)
699 return NULL;
700 if ((urb = usb_alloc_urb(0, GFP_KERNEL)) == NULL) {
701 kfree(writebuf);
702 return NULL;
703 }
704
705 usb_fill_bulk_urb(urb, usblp->dev,
706 usb_sndbulkpipe(usblp->dev,
707 usblp->protocol[usblp->current_protocol].epwrite->bEndpointAddress),
708 writebuf, transfer_length, usblp_bulk_write, usblp);
709 urb->transfer_flags |= URB_FREE_BUFFER;
710
711 return urb;
712 }
713
714 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
715 {
716 struct usblp *usblp = file->private_data;
717 struct urb *writeurb;
718 int rv;
719 int transfer_length;
720 ssize_t writecount = 0;
721
722 if (mutex_lock_interruptible(&usblp->wmut)) {
723 rv = -EINTR;
724 goto raise_biglock;
725 }
726 if ((rv = usblp_wwait(usblp, !!(file->f_flags & O_NONBLOCK))) < 0)
727 goto raise_wait;
728
729 while (writecount < count) {
730 /*
731 * Step 1: Submit next block.
732 */
733 if ((transfer_length = count - writecount) > USBLP_BUF_SIZE)
734 transfer_length = USBLP_BUF_SIZE;
735
736 rv = -ENOMEM;
737 if ((writeurb = usblp_new_writeurb(usblp, transfer_length)) == NULL)
738 goto raise_urb;
739 usb_anchor_urb(writeurb, &usblp->urbs);
740
741 if (copy_from_user(writeurb->transfer_buffer,
742 buffer + writecount, transfer_length)) {
743 rv = -EFAULT;
744 goto raise_badaddr;
745 }
746
747 spin_lock_irq(&usblp->lock);
748 usblp->wcomplete = 0;
749 spin_unlock_irq(&usblp->lock);
750 if ((rv = usb_submit_urb(writeurb, GFP_KERNEL)) < 0) {
751 usblp->wstatus = 0;
752 spin_lock_irq(&usblp->lock);
753 usblp->no_paper = 0;
754 usblp->wcomplete = 1;
755 wake_up(&usblp->wwait);
756 spin_unlock_irq(&usblp->lock);
757 if (rv != -ENOMEM)
758 rv = -EIO;
759 goto raise_submit;
760 }
761
762 /*
763 * Step 2: Wait for transfer to end, collect results.
764 */
765 rv = usblp_wwait(usblp, !!(file->f_flags&O_NONBLOCK));
766 if (rv < 0) {
767 if (rv == -EAGAIN) {
768 /* Presume that it's going to complete well. */
769 writecount += transfer_length;
770 }
771 if (rv == -ENOSPC) {
772 spin_lock_irq(&usblp->lock);
773 usblp->no_paper = 1; /* Mark for poll(2) */
774 spin_unlock_irq(&usblp->lock);
775 writecount += transfer_length;
776 }
777 /* Leave URB dangling, to be cleaned on close. */
778 goto collect_error;
779 }
780
781 if (usblp->wstatus < 0) {
782 rv = -EIO;
783 goto collect_error;
784 }
785 /*
786 * This is critical: it must be our URB, not other writer's.
787 * The wmut exists mainly to cover us here.
788 */
789 writecount += usblp->wstatus;
790 }
791
792 mutex_unlock(&usblp->wmut);
793 return writecount;
794
795 raise_submit:
796 raise_badaddr:
797 usb_unanchor_urb(writeurb);
798 usb_free_urb(writeurb);
799 raise_urb:
800 raise_wait:
801 collect_error: /* Out of raise sequence */
802 mutex_unlock(&usblp->wmut);
803 raise_biglock:
804 return writecount ? writecount : rv;
805 }
806
807 /*
808 * Notice that we fail to restart in a few cases: on EFAULT, on restart
809 * error, etc. This is the historical behaviour. In all such cases we return
810 * EIO, and applications loop in order to get the new read going.
811 */
812 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t len, loff_t *ppos)
813 {
814 struct usblp *usblp = file->private_data;
815 ssize_t count;
816 ssize_t avail;
817 int rv;
818
819 if (!usblp->bidir)
820 return -EINVAL;
821
822 rv = usblp_rwait_and_lock(usblp, !!(file->f_flags & O_NONBLOCK));
823 if (rv < 0)
824 return rv;
825
826 if ((avail = usblp->rstatus) < 0) {
827 printk(KERN_ERR "usblp%d: error %d reading from printer\n",
828 usblp->minor, (int)avail);
829 usblp_submit_read(usblp);
830 count = -EIO;
831 goto done;
832 }
833
834 count = len < avail - usblp->readcount ? len : avail - usblp->readcount;
835 if (count != 0 &&
836 copy_to_user(buffer, usblp->readbuf + usblp->readcount, count)) {
837 count = -EFAULT;
838 goto done;
839 }
840
841 if ((usblp->readcount += count) == avail) {
842 if (usblp_submit_read(usblp) < 0) {
843 /* We don't want to leak USB return codes into errno. */
844 if (count == 0)
845 count = -EIO;
846 goto done;
847 }
848 }
849
850 done:
851 mutex_unlock (&usblp->mut);
852 return count;
853 }
854
855 /*
856 * Wait for the write path to come idle.
857 * This is called under the ->wmut, so the idle path stays idle.
858 *
859 * Our write path has a peculiar property: it does not buffer like a tty,
860 * but waits for the write to succeed. This allows our ->release to bug out
861 * without waiting for writes to drain. But it obviously does not work
862 * when O_NONBLOCK is set. So, applications setting O_NONBLOCK must use
863 * select(2) or poll(2) to wait for the buffer to drain before closing.
864 * Alternatively, set blocking mode with fcntl and issue a zero-size write.
865 */
866 static int usblp_wwait(struct usblp *usblp, int nonblock)
867 {
868 DECLARE_WAITQUEUE(waita, current);
869 int rc;
870 int err = 0;
871
872 add_wait_queue(&usblp->wwait, &waita);
873 for (;;) {
874 set_current_state(TASK_INTERRUPTIBLE);
875 if (mutex_lock_interruptible(&usblp->mut)) {
876 rc = -EINTR;
877 break;
878 }
879 rc = usblp_wtest(usblp, nonblock);
880 mutex_unlock(&usblp->mut);
881 if (rc <= 0)
882 break;
883
884 if (usblp->flags & LP_ABORT) {
885 if (schedule_timeout(msecs_to_jiffies(5000)) == 0) {
886 err = usblp_check_status(usblp, err);
887 if (err == 1) { /* Paper out */
888 rc = -ENOSPC;
889 break;
890 }
891 }
892 } else {
893 schedule();
894 }
895 }
896 set_current_state(TASK_RUNNING);
897 remove_wait_queue(&usblp->wwait, &waita);
898 return rc;
899 }
900
901 static int usblp_wtest(struct usblp *usblp, int nonblock)
902 {
903 unsigned long flags;
904
905 if (!usblp->present)
906 return -ENODEV;
907 if (signal_pending(current))
908 return -EINTR;
909 spin_lock_irqsave(&usblp->lock, flags);
910 if (usblp->wcomplete) {
911 spin_unlock_irqrestore(&usblp->lock, flags);
912 return 0;
913 }
914 spin_unlock_irqrestore(&usblp->lock, flags);
915 if (usblp->sleeping)
916 return -ENODEV;
917 if (nonblock)
918 return -EAGAIN;
919 return 1;
920 }
921
922 /*
923 * Wait for read bytes to become available. This probably should have been
924 * called usblp_r_lock_and_wait(), because we lock first. But it's a traditional
925 * name for functions which lock and return.
926 *
927 * We do not use wait_event_interruptible because it makes locking iffy.
928 */
929 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock)
930 {
931 DECLARE_WAITQUEUE(waita, current);
932 int rc;
933
934 add_wait_queue(&usblp->rwait, &waita);
935 for (;;) {
936 if (mutex_lock_interruptible(&usblp->mut)) {
937 rc = -EINTR;
938 break;
939 }
940 set_current_state(TASK_INTERRUPTIBLE);
941 if ((rc = usblp_rtest(usblp, nonblock)) < 0) {
942 mutex_unlock(&usblp->mut);
943 break;
944 }
945 if (rc == 0) /* Keep it locked */
946 break;
947 mutex_unlock(&usblp->mut);
948 schedule();
949 }
950 set_current_state(TASK_RUNNING);
951 remove_wait_queue(&usblp->rwait, &waita);
952 return rc;
953 }
954
955 static int usblp_rtest(struct usblp *usblp, int nonblock)
956 {
957 unsigned long flags;
958
959 if (!usblp->present)
960 return -ENODEV;
961 if (signal_pending(current))
962 return -EINTR;
963 spin_lock_irqsave(&usblp->lock, flags);
964 if (usblp->rcomplete) {
965 spin_unlock_irqrestore(&usblp->lock, flags);
966 return 0;
967 }
968 spin_unlock_irqrestore(&usblp->lock, flags);
969 if (usblp->sleeping)
970 return -ENODEV;
971 if (nonblock)
972 return -EAGAIN;
973 return 1;
974 }
975
976 /*
977 * Please check ->bidir and other such things outside for now.
978 */
979 static int usblp_submit_read(struct usblp *usblp)
980 {
981 struct urb *urb;
982 unsigned long flags;
983 int rc;
984
985 rc = -ENOMEM;
986 if ((urb = usb_alloc_urb(0, GFP_KERNEL)) == NULL)
987 goto raise_urb;
988
989 usb_fill_bulk_urb(urb, usblp->dev,
990 usb_rcvbulkpipe(usblp->dev,
991 usblp->protocol[usblp->current_protocol].epread->bEndpointAddress),
992 usblp->readbuf, USBLP_BUF_SIZE_IN,
993 usblp_bulk_read, usblp);
994 usb_anchor_urb(urb, &usblp->urbs);
995
996 spin_lock_irqsave(&usblp->lock, flags);
997 usblp->readcount = 0; /* XXX Why here? */
998 usblp->rcomplete = 0;
999 spin_unlock_irqrestore(&usblp->lock, flags);
1000 if ((rc = usb_submit_urb(urb, GFP_KERNEL)) < 0) {
1001 dbg("error submitting urb (%d)", rc);
1002 spin_lock_irqsave(&usblp->lock, flags);
1003 usblp->rstatus = rc;
1004 usblp->rcomplete = 1;
1005 spin_unlock_irqrestore(&usblp->lock, flags);
1006 goto raise_submit;
1007 }
1008
1009 return 0;
1010
1011 raise_submit:
1012 usb_unanchor_urb(urb);
1013 usb_free_urb(urb);
1014 raise_urb:
1015 return rc;
1016 }
1017
1018 /*
1019 * Checks for printers that have quirks, such as requiring unidirectional
1020 * communication but reporting bidirectional; currently some HP printers
1021 * have this flaw (HP 810, 880, 895, etc.), or needing an init string
1022 * sent at each open (like some Epsons).
1023 * Returns 1 if found, 0 if not found.
1024 *
1025 * HP recommended that we use the bidirectional interface but
1026 * don't attempt any bulk IN transfers from the IN endpoint.
1027 * Here's some more detail on the problem:
1028 * The problem is not that it isn't bidirectional though. The problem
1029 * is that if you request a device ID, or status information, while
1030 * the buffers are full, the return data will end up in the print data
1031 * buffer. For example if you make sure you never request the device ID
1032 * while you are sending print data, and you don't try to query the
1033 * printer status every couple of milliseconds, you will probably be OK.
1034 */
1035 static unsigned int usblp_quirks (__u16 vendor, __u16 product)
1036 {
1037 int i;
1038
1039 for (i = 0; quirk_printers[i].vendorId; i++) {
1040 if (vendor == quirk_printers[i].vendorId &&
1041 product == quirk_printers[i].productId)
1042 return quirk_printers[i].quirks;
1043 }
1044 return 0;
1045 }
1046
1047 static const struct file_operations usblp_fops = {
1048 .owner = THIS_MODULE,
1049 .read = usblp_read,
1050 .write = usblp_write,
1051 .poll = usblp_poll,
1052 .unlocked_ioctl = usblp_ioctl,
1053 .compat_ioctl = usblp_ioctl,
1054 .open = usblp_open,
1055 .release = usblp_release,
1056 };
1057
1058 static struct usb_class_driver usblp_class = {
1059 .name = "lp%d",
1060 .fops = &usblp_fops,
1061 .minor_base = USBLP_MINOR_BASE,
1062 };
1063
1064 static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf)
1065 {
1066 struct usb_interface *intf = to_usb_interface(dev);
1067 struct usblp *usblp = usb_get_intfdata (intf);
1068
1069 if (usblp->device_id_string[0] == 0 &&
1070 usblp->device_id_string[1] == 0)
1071 return 0;
1072
1073 return sprintf(buf, "%s", usblp->device_id_string+2);
1074 }
1075
1076 static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL);
1077
1078 static int usblp_probe(struct usb_interface *intf,
1079 const struct usb_device_id *id)
1080 {
1081 struct usb_device *dev = interface_to_usbdev (intf);
1082 struct usblp *usblp = NULL;
1083 int protocol;
1084 int retval;
1085
1086 /* Malloc and start initializing usblp structure so we can use it
1087 * directly. */
1088 if (!(usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL))) {
1089 retval = -ENOMEM;
1090 goto abort;
1091 }
1092 usblp->dev = dev;
1093 mutex_init(&usblp->wmut);
1094 mutex_init (&usblp->mut);
1095 spin_lock_init(&usblp->lock);
1096 init_waitqueue_head(&usblp->rwait);
1097 init_waitqueue_head(&usblp->wwait);
1098 init_usb_anchor(&usblp->urbs);
1099 usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
1100 usblp->intf = intf;
1101
1102 /* Malloc device ID string buffer to the largest expected length,
1103 * since we can re-query it on an ioctl and a dynamic string
1104 * could change in length. */
1105 if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
1106 retval = -ENOMEM;
1107 goto abort;
1108 }
1109
1110 /*
1111 * Allocate read buffer. We somewhat wastefully
1112 * malloc both regardless of bidirectionality, because the
1113 * alternate setting can be changed later via an ioctl.
1114 */
1115 if (!(usblp->readbuf = kmalloc(USBLP_BUF_SIZE_IN, GFP_KERNEL))) {
1116 retval = -ENOMEM;
1117 goto abort;
1118 }
1119
1120 /* Allocate buffer for printer status */
1121 usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
1122 if (!usblp->statusbuf) {
1123 retval = -ENOMEM;
1124 goto abort;
1125 }
1126
1127 /* Lookup quirks for this printer. */
1128 usblp->quirks = usblp_quirks(
1129 le16_to_cpu(dev->descriptor.idVendor),
1130 le16_to_cpu(dev->descriptor.idProduct));
1131
1132 /* Analyze and pick initial alternate settings and endpoints. */
1133 protocol = usblp_select_alts(usblp);
1134 if (protocol < 0) {
1135 dbg("incompatible printer-class device 0x%4.4X/0x%4.4X",
1136 le16_to_cpu(dev->descriptor.idVendor),
1137 le16_to_cpu(dev->descriptor.idProduct));
1138 retval = -ENODEV;
1139 goto abort;
1140 }
1141
1142 /* Setup the selected alternate setting and endpoints. */
1143 if (usblp_set_protocol(usblp, protocol) < 0) {
1144 retval = -ENODEV; /* ->probe isn't ->ioctl */
1145 goto abort;
1146 }
1147
1148 /* Retrieve and store the device ID string. */
1149 usblp_cache_device_id_string(usblp);
1150 retval = device_create_file(&intf->dev, &dev_attr_ieee1284_id);
1151 if (retval)
1152 goto abort_intfdata;
1153
1154 #ifdef DEBUG
1155 usblp_check_status(usblp, 0);
1156 #endif
1157
1158 usb_set_intfdata (intf, usblp);
1159
1160 usblp->present = 1;
1161
1162 retval = usb_register_dev(intf, &usblp_class);
1163 if (retval) {
1164 printk(KERN_ERR "usblp: Not able to get a minor"
1165 " (base %u, slice default): %d\n",
1166 USBLP_MINOR_BASE, retval);
1167 goto abort_intfdata;
1168 }
1169 usblp->minor = intf->minor;
1170 printk(KERN_INFO "usblp%d: USB %sdirectional printer dev %d "
1171 "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X\n",
1172 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
1173 usblp->ifnum,
1174 usblp->protocol[usblp->current_protocol].alt_setting,
1175 usblp->current_protocol,
1176 le16_to_cpu(usblp->dev->descriptor.idVendor),
1177 le16_to_cpu(usblp->dev->descriptor.idProduct));
1178
1179 return 0;
1180
1181 abort_intfdata:
1182 usb_set_intfdata (intf, NULL);
1183 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1184 abort:
1185 if (usblp) {
1186 kfree(usblp->readbuf);
1187 kfree(usblp->statusbuf);
1188 kfree(usblp->device_id_string);
1189 kfree(usblp);
1190 }
1191 return retval;
1192 }
1193
1194 /*
1195 * We are a "new" style driver with usb_device_id table,
1196 * but our requirements are too intricate for simple match to handle.
1197 *
1198 * The "proto_bias" option may be used to specify the preferred protocol
1199 * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3). If the device
1200 * supports the preferred protocol, then we bind to it.
1201 *
1202 * The best interface for us is 7/1/2, because it is compatible
1203 * with a stream of characters. If we find it, we bind to it.
1204 *
1205 * Note that the people from hpoj.sourceforge.net need to be able to
1206 * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
1207 *
1208 * Failing 7/1/2, we look for 7/1/3, even though it's probably not
1209 * stream-compatible, because this matches the behaviour of the old code.
1210 *
1211 * If nothing else, we bind to 7/1/1 - the unidirectional interface.
1212 */
1213 static int usblp_select_alts(struct usblp *usblp)
1214 {
1215 struct usb_interface *if_alt;
1216 struct usb_host_interface *ifd;
1217 struct usb_endpoint_descriptor *epd, *epwrite, *epread;
1218 int p, i, e;
1219
1220 if_alt = usblp->intf;
1221
1222 for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1223 usblp->protocol[p].alt_setting = -1;
1224
1225 /* Find out what we have. */
1226 for (i = 0; i < if_alt->num_altsetting; i++) {
1227 ifd = &if_alt->altsetting[i];
1228
1229 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
1230 if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS))
1231 continue;
1232
1233 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1234 ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1235 continue;
1236
1237 /* Look for bulk OUT and IN endpoints. */
1238 epwrite = epread = NULL;
1239 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1240 epd = &ifd->endpoint[e].desc;
1241
1242 if (usb_endpoint_is_bulk_out(epd))
1243 if (!epwrite)
1244 epwrite = epd;
1245
1246 if (usb_endpoint_is_bulk_in(epd))
1247 if (!epread)
1248 epread = epd;
1249 }
1250
1251 /* Ignore buggy hardware without the right endpoints. */
1252 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1253 continue;
1254
1255 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1256 * and buggy bidirectional printers. */
1257 if (ifd->desc.bInterfaceProtocol == 1) {
1258 epread = NULL;
1259 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1260 printk(KERN_INFO "usblp%d: Disabling reads from "
1261 "problematic bidirectional printer\n",
1262 usblp->minor);
1263 epread = NULL;
1264 }
1265
1266 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1267 ifd->desc.bAlternateSetting;
1268 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1269 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1270 }
1271
1272 /* If our requested protocol is supported, then use it. */
1273 if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1274 proto_bias <= USBLP_LAST_PROTOCOL &&
1275 usblp->protocol[proto_bias].alt_setting != -1)
1276 return proto_bias;
1277
1278 /* Ordering is important here. */
1279 if (usblp->protocol[2].alt_setting != -1)
1280 return 2;
1281 if (usblp->protocol[1].alt_setting != -1)
1282 return 1;
1283 if (usblp->protocol[3].alt_setting != -1)
1284 return 3;
1285
1286 /* If nothing is available, then don't bind to this device. */
1287 return -1;
1288 }
1289
1290 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1291 {
1292 int r, alts;
1293
1294 if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1295 return -EINVAL;
1296
1297 alts = usblp->protocol[protocol].alt_setting;
1298 if (alts < 0)
1299 return -EINVAL;
1300 r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1301 if (r < 0) {
1302 printk(KERN_ERR "usblp: can't set desired altsetting %d on interface %d\n",
1303 alts, usblp->ifnum);
1304 return r;
1305 }
1306
1307 usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1308 usblp->current_protocol = protocol;
1309 dbg("usblp%d set protocol %d", usblp->minor, protocol);
1310 return 0;
1311 }
1312
1313 /* Retrieves and caches device ID string.
1314 * Returns length, including length bytes but not null terminator.
1315 * On error, returns a negative errno value. */
1316 static int usblp_cache_device_id_string(struct usblp *usblp)
1317 {
1318 int err, length;
1319
1320 err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1321 if (err < 0) {
1322 dbg("usblp%d: error = %d reading IEEE-1284 Device ID string",
1323 usblp->minor, err);
1324 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1325 return -EIO;
1326 }
1327
1328 /* First two bytes are length in big-endian.
1329 * They count themselves, and we copy them into
1330 * the user's buffer. */
1331 length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1332 if (length < 2)
1333 length = 2;
1334 else if (length >= USBLP_DEVICE_ID_SIZE)
1335 length = USBLP_DEVICE_ID_SIZE - 1;
1336 usblp->device_id_string[length] = '\0';
1337
1338 dbg("usblp%d Device ID string [len=%d]=\"%s\"",
1339 usblp->minor, length, &usblp->device_id_string[2]);
1340
1341 return length;
1342 }
1343
1344 static void usblp_disconnect(struct usb_interface *intf)
1345 {
1346 struct usblp *usblp = usb_get_intfdata (intf);
1347
1348 usb_deregister_dev(intf, &usblp_class);
1349
1350 if (!usblp || !usblp->dev) {
1351 err("bogus disconnect");
1352 BUG ();
1353 }
1354
1355 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1356
1357 mutex_lock (&usblp_mutex);
1358 mutex_lock (&usblp->mut);
1359 usblp->present = 0;
1360 wake_up(&usblp->wwait);
1361 wake_up(&usblp->rwait);
1362 usb_set_intfdata (intf, NULL);
1363
1364 usblp_unlink_urbs(usblp);
1365 mutex_unlock (&usblp->mut);
1366
1367 if (!usblp->used)
1368 usblp_cleanup (usblp);
1369 mutex_unlock (&usblp_mutex);
1370 }
1371
1372 static int usblp_suspend (struct usb_interface *intf, pm_message_t message)
1373 {
1374 struct usblp *usblp = usb_get_intfdata (intf);
1375
1376 /* we take no more IO */
1377 usblp->sleeping = 1;
1378 usblp_unlink_urbs(usblp);
1379 #if 0 /* XXX Do we want this? What if someone is reading, should we fail? */
1380 /* not strictly necessary, but just in case */
1381 wake_up(&usblp->wwait);
1382 wake_up(&usblp->rwait);
1383 #endif
1384
1385 return 0;
1386 }
1387
1388 static int usblp_resume (struct usb_interface *intf)
1389 {
1390 struct usblp *usblp = usb_get_intfdata (intf);
1391 int r;
1392
1393 usblp->sleeping = 0;
1394 r = handle_bidir (usblp);
1395
1396 return r;
1397 }
1398
1399 static struct usb_device_id usblp_ids [] = {
1400 { USB_DEVICE_INFO(7, 1, 1) },
1401 { USB_DEVICE_INFO(7, 1, 2) },
1402 { USB_DEVICE_INFO(7, 1, 3) },
1403 { USB_INTERFACE_INFO(7, 1, 1) },
1404 { USB_INTERFACE_INFO(7, 1, 2) },
1405 { USB_INTERFACE_INFO(7, 1, 3) },
1406 { USB_DEVICE(0x04b8, 0x0202) }, /* Seiko Epson Receipt Printer M129C */
1407 { } /* Terminating entry */
1408 };
1409
1410 MODULE_DEVICE_TABLE (usb, usblp_ids);
1411
1412 static struct usb_driver usblp_driver = {
1413 .name = "usblp",
1414 .probe = usblp_probe,
1415 .disconnect = usblp_disconnect,
1416 .suspend = usblp_suspend,
1417 .resume = usblp_resume,
1418 .id_table = usblp_ids,
1419 .supports_autosuspend = 1,
1420 };
1421
1422 static int __init usblp_init(void)
1423 {
1424 return usb_register(&usblp_driver);
1425 }
1426
1427 static void __exit usblp_exit(void)
1428 {
1429 usb_deregister(&usblp_driver);
1430 }
1431
1432 module_init(usblp_init);
1433 module_exit(usblp_exit);
1434
1435 MODULE_AUTHOR( DRIVER_AUTHOR );
1436 MODULE_DESCRIPTION( DRIVER_DESC );
1437 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1438 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1439 MODULE_LICENSE("GPL");
WRT350N Kernel Patches