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Add linux-next specific files for 20110421
[linux-2.6/next.git] / drivers / usb / class / usblp.c
blob9eca4053312efa320cea4b63325dd839b46f4185
1 /*
2 * usblp.c
3 *
4 * Copyright (c) 1999 Michael Gee <michael@linuxspecific.com>
5 * Copyright (c) 1999 Pavel Machek <pavel@ucw.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_alloc_coherent() 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 no_paper; /* Paper Out happened */
167 unsigned char *device_id_string; /* IEEE 1284 DEVICE ID string (ptr) */
168 /* first 2 bytes are (big-endian) length */
169 };
170
171 #ifdef DEBUG
172 static void usblp_dump(struct usblp *usblp)
173 {
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("device_id_string=\"%s\"",
195 usblp->device_id_string ?
196 usblp->device_id_string + 2 :
197 (unsigned char *)"(null)");
198 }
199 #endif
200
201 /* Quirks: various printer quirks are handled by this table & its flags. */
202
203 struct quirk_printer_struct {
204 __u16 vendorId;
205 __u16 productId;
206 unsigned int quirks;
207 };
208
209 #define USBLP_QUIRK_BIDIR 0x1 /* reports bidir but requires unidirectional mode (no INs/reads) */
210 #define USBLP_QUIRK_USB_INIT 0x2 /* needs vendor USB init string */
211 #define USBLP_QUIRK_BAD_CLASS 0x4 /* descriptor uses vendor-specific Class or SubClass */
212
213 static const struct quirk_printer_struct quirk_printers[] = {
214 { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
215 { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
216 { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
217 { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
218 { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
219 { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
220 { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */
221 { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */
222 { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
223 { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
224 { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
225 { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
226 { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
227 { 0x0482, 0x0010, USBLP_QUIRK_BIDIR }, /* Kyocera Mita FS 820, by zut <kernel@zut.de> */
228 { 0x04f9, 0x000d, USBLP_QUIRK_BIDIR }, /* Brother Industries, Ltd HL-1440 Laser Printer */
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 retval = usb_control_msg(usblp->dev,
262 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
263 request, type | dir | recip, value, index, buf, len, USBLP_CTL_TIMEOUT);
264 dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d",
265 request, !!dir, recip, value, index, len, retval);
266 return retval < 0 ? retval : 0;
267 }
268
269 #define usblp_read_status(usblp, status)\
270 usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
271 #define usblp_get_id(usblp, config, id, maxlen)\
272 usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
273 #define usblp_reset(usblp)\
274 usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
275
276 #define usblp_hp_channel_change_request(usblp, channel, buffer) \
277 usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
278
279 /*
280 * See the description for usblp_select_alts() below for the usage
281 * explanation. Look into your /proc/bus/usb/devices and dmesg in
282 * case of any trouble.
283 */
284 static int proto_bias = -1;
285
286 /*
287 * URB callback.
288 */
289
290 static void usblp_bulk_read(struct urb *urb)
291 {
292 struct usblp *usblp = urb->context;
293 int status = urb->status;
294
295 if (usblp->present && usblp->used) {
296 if (status)
297 printk(KERN_WARNING "usblp%d: "
298 "nonzero read bulk status received: %d\n",
299 usblp->minor, status);
300 }
301 spin_lock(&usblp->lock);
302 if (status < 0)
303 usblp->rstatus = status;
304 else
305 usblp->rstatus = urb->actual_length;
306 usblp->rcomplete = 1;
307 wake_up(&usblp->rwait);
308 spin_unlock(&usblp->lock);
309
310 usb_free_urb(urb);
311 }
312
313 static void usblp_bulk_write(struct urb *urb)
314 {
315 struct usblp *usblp = urb->context;
316 int status = urb->status;
317
318 if (usblp->present && usblp->used) {
319 if (status)
320 printk(KERN_WARNING "usblp%d: "
321 "nonzero write bulk status received: %d\n",
322 usblp->minor, status);
323 }
324 spin_lock(&usblp->lock);
325 if (status < 0)
326 usblp->wstatus = status;
327 else
328 usblp->wstatus = urb->actual_length;
329 usblp->no_paper = 0;
330 usblp->wcomplete = 1;
331 wake_up(&usblp->wwait);
332 spin_unlock(&usblp->lock);
333
334 usb_free_urb(urb);
335 }
336
337 /*
338 * Get and print printer errors.
339 */
340
341 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
342
343 static int usblp_check_status(struct usblp *usblp, int err)
344 {
345 unsigned char status, newerr = 0;
346 int error;
347
348 mutex_lock(&usblp->mut);
349 if ((error = usblp_read_status(usblp, usblp->statusbuf)) < 0) {
350 mutex_unlock(&usblp->mut);
351 if (printk_ratelimit())
352 printk(KERN_ERR
353 "usblp%d: error %d reading printer status\n",
354 usblp->minor, error);
355 return 0;
356 }
357 status = *usblp->statusbuf;
358 mutex_unlock(&usblp->mut);
359
360 if (~status & LP_PERRORP)
361 newerr = 3;
362 if (status & LP_POUTPA)
363 newerr = 1;
364 if (~status & LP_PSELECD)
365 newerr = 2;
366
367 if (newerr != err) {
368 printk(KERN_INFO "usblp%d: %s\n",
369 usblp->minor, usblp_messages[newerr]);
370 }
371
372 return newerr;
373 }
374
375 static int handle_bidir(struct usblp *usblp)
376 {
377 if (usblp->bidir && usblp->used) {
378 if (usblp_submit_read(usblp) < 0)
379 return -EIO;
380 }
381 return 0;
382 }
383
384 /*
385 * File op functions.
386 */
387
388 static int usblp_open(struct inode *inode, struct file *file)
389 {
390 int minor = iminor(inode);
391 struct usblp *usblp;
392 struct usb_interface *intf;
393 int retval;
394
395 if (minor < 0)
396 return -ENODEV;
397
398 mutex_lock(&usblp_mutex);
399
400 retval = -ENODEV;
401 intf = usb_find_interface(&usblp_driver, minor);
402 if (!intf)
403 goto out;
404 usblp = usb_get_intfdata(intf);
405 if (!usblp || !usblp->dev || !usblp->present)
406 goto out;
407
408 retval = -EBUSY;
409 if (usblp->used)
410 goto out;
411
412 /*
413 * We do not implement LP_ABORTOPEN/LPABORTOPEN for two reasons:
414 * - We do not want persistent state which close(2) does not clear
415 * - It is not used anyway, according to CUPS people
416 */
417
418 retval = usb_autopm_get_interface(intf);
419 if (retval < 0)
420 goto out;
421 usblp->used = 1;
422 file->private_data = usblp;
423
424 usblp->wcomplete = 1; /* we begin writeable */
425 usblp->wstatus = 0;
426 usblp->rcomplete = 0;
427
428 if (handle_bidir(usblp) < 0) {
429 usb_autopm_put_interface(intf);
430 usblp->used = 0;
431 file->private_data = NULL;
432 retval = -EIO;
433 }
434 out:
435 mutex_unlock(&usblp_mutex);
436 return retval;
437 }
438
439 static void usblp_cleanup(struct usblp *usblp)
440 {
441 printk(KERN_INFO "usblp%d: removed\n", usblp->minor);
442
443 kfree(usblp->readbuf);
444 kfree(usblp->device_id_string);
445 kfree(usblp->statusbuf);
446 kfree(usblp);
447 }
448
449 static void usblp_unlink_urbs(struct usblp *usblp)
450 {
451 usb_kill_anchored_urbs(&usblp->urbs);
452 }
453
454 static int usblp_release(struct inode *inode, struct file *file)
455 {
456 struct usblp *usblp = file->private_data;
457
458 usblp->flags &= ~LP_ABORT;
459
460 mutex_lock(&usblp_mutex);
461 usblp->used = 0;
462 if (usblp->present) {
463 usblp_unlink_urbs(usblp);
464 usb_autopm_put_interface(usblp->intf);
465 } else /* finish cleanup from disconnect */
466 usblp_cleanup(usblp);
467 mutex_unlock(&usblp_mutex);
468 return 0;
469 }
470
471 /* No kernel lock - fine */
472 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
473 {
474 int ret;
475 unsigned long flags;
476
477 struct usblp *usblp = file->private_data;
478 /* Should we check file->f_mode & FMODE_WRITE before poll_wait()? */
479 poll_wait(file, &usblp->rwait, wait);
480 poll_wait(file, &usblp->wwait, wait);
481 spin_lock_irqsave(&usblp->lock, flags);
482 ret = ((usblp->bidir && usblp->rcomplete) ? POLLIN | POLLRDNORM : 0) |
483 ((usblp->no_paper || usblp->wcomplete) ? POLLOUT | POLLWRNORM : 0);
484 spin_unlock_irqrestore(&usblp->lock, flags);
485 return ret;
486 }
487
488 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
489 {
490 struct usblp *usblp = file->private_data;
491 int length, err, i;
492 unsigned char newChannel;
493 int status;
494 int twoints[2];
495 int retval = 0;
496
497 mutex_lock(&usblp->mut);
498 if (!usblp->present) {
499 retval = -ENODEV;
500 goto done;
501 }
502
503 dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd),
504 _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd));
505
506 if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */
507
508 switch (_IOC_NR(cmd)) {
509
510 case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
511 if (_IOC_DIR(cmd) != _IOC_READ) {
512 retval = -EINVAL;
513 goto done;
514 }
515
516 length = usblp_cache_device_id_string(usblp);
517 if (length < 0) {
518 retval = length;
519 goto done;
520 }
521 if (length > _IOC_SIZE(cmd))
522 length = _IOC_SIZE(cmd); /* truncate */
523
524 if (copy_to_user((void __user *) arg,
525 usblp->device_id_string,
526 (unsigned long) length)) {
527 retval = -EFAULT;
528 goto done;
529 }
530
531 break;
532
533 case IOCNR_GET_PROTOCOLS:
534 if (_IOC_DIR(cmd) != _IOC_READ ||
535 _IOC_SIZE(cmd) < sizeof(twoints)) {
536 retval = -EINVAL;
537 goto done;
538 }
539
540 twoints[0] = usblp->current_protocol;
541 twoints[1] = 0;
542 for (i = USBLP_FIRST_PROTOCOL;
543 i <= USBLP_LAST_PROTOCOL; i++) {
544 if (usblp->protocol[i].alt_setting >= 0)
545 twoints[1] |= (1<<i);
546 }
547
548 if (copy_to_user((void __user *)arg,
549 (unsigned char *)twoints,
550 sizeof(twoints))) {
551 retval = -EFAULT;
552 goto done;
553 }
554
555 break;
556
557 case IOCNR_SET_PROTOCOL:
558 if (_IOC_DIR(cmd) != _IOC_WRITE) {
559 retval = -EINVAL;
560 goto done;
561 }
562
563 #ifdef DEBUG
564 if (arg == -10) {
565 usblp_dump(usblp);
566 break;
567 }
568 #endif
569
570 usblp_unlink_urbs(usblp);
571 retval = usblp_set_protocol(usblp, arg);
572 if (retval < 0) {
573 usblp_set_protocol(usblp,
574 usblp->current_protocol);
575 }
576 break;
577
578 case IOCNR_HP_SET_CHANNEL:
579 if (_IOC_DIR(cmd) != _IOC_WRITE ||
580 le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
581 usblp->quirks & USBLP_QUIRK_BIDIR) {
582 retval = -EINVAL;
583 goto done;
584 }
585
586 err = usblp_hp_channel_change_request(usblp,
587 arg, &newChannel);
588 if (err < 0) {
589 dev_err(&usblp->dev->dev,
590 "usblp%d: error = %d setting "
591 "HP channel\n",
592 usblp->minor, err);
593 retval = -EIO;
594 goto done;
595 }
596
597 dbg("usblp%d requested/got HP channel %ld/%d",
598 usblp->minor, arg, newChannel);
599 break;
600
601 case IOCNR_GET_BUS_ADDRESS:
602 if (_IOC_DIR(cmd) != _IOC_READ ||
603 _IOC_SIZE(cmd) < sizeof(twoints)) {
604 retval = -EINVAL;
605 goto done;
606 }
607
608 twoints[0] = usblp->dev->bus->busnum;
609 twoints[1] = usblp->dev->devnum;
610 if (copy_to_user((void __user *)arg,
611 (unsigned char *)twoints,
612 sizeof(twoints))) {
613 retval = -EFAULT;
614 goto done;
615 }
616
617 dbg("usblp%d is bus=%d, device=%d",
618 usblp->minor, twoints[0], twoints[1]);
619 break;
620
621 case IOCNR_GET_VID_PID:
622 if (_IOC_DIR(cmd) != _IOC_READ ||
623 _IOC_SIZE(cmd) < sizeof(twoints)) {
624 retval = -EINVAL;
625 goto done;
626 }
627
628 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
629 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
630 if (copy_to_user((void __user *)arg,
631 (unsigned char *)twoints,
632 sizeof(twoints))) {
633 retval = -EFAULT;
634 goto done;
635 }
636
637 dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X",
638 usblp->minor, twoints[0], twoints[1]);
639 break;
640
641 case IOCNR_SOFT_RESET:
642 if (_IOC_DIR(cmd) != _IOC_NONE) {
643 retval = -EINVAL;
644 goto done;
645 }
646 retval = usblp_reset(usblp);
647 break;
648 default:
649 retval = -ENOTTY;
650 }
651 else /* old-style ioctl value */
652 switch (cmd) {
653
654 case LPGETSTATUS:
655 if ((retval = usblp_read_status(usblp, usblp->statusbuf))) {
656 if (printk_ratelimit())
657 printk(KERN_ERR "usblp%d:"
658 "failed reading printer status (%d)\n",
659 usblp->minor, retval);
660 retval = -EIO;
661 goto done;
662 }
663 status = *usblp->statusbuf;
664 if (copy_to_user((void __user *)arg, &status, sizeof(int)))
665 retval = -EFAULT;
666 break;
667
668 case LPABORT:
669 if (arg)
670 usblp->flags |= LP_ABORT;
671 else
672 usblp->flags &= ~LP_ABORT;
673 break;
674
675 default:
676 retval = -ENOTTY;
677 }
678
679 done:
680 mutex_unlock(&usblp->mut);
681 return retval;
682 }
683
684 static struct urb *usblp_new_writeurb(struct usblp *usblp, int transfer_length)
685 {
686 struct urb *urb;
687 char *writebuf;
688
689 if ((writebuf = kmalloc(transfer_length, GFP_KERNEL)) == NULL)
690 return NULL;
691 if ((urb = usb_alloc_urb(0, GFP_KERNEL)) == NULL) {
692 kfree(writebuf);
693 return NULL;
694 }
695
696 usb_fill_bulk_urb(urb, usblp->dev,
697 usb_sndbulkpipe(usblp->dev,
698 usblp->protocol[usblp->current_protocol].epwrite->bEndpointAddress),
699 writebuf, transfer_length, usblp_bulk_write, usblp);
700 urb->transfer_flags |= URB_FREE_BUFFER;
701
702 return urb;
703 }
704
705 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
706 {
707 struct usblp *usblp = file->private_data;
708 struct urb *writeurb;
709 int rv;
710 int transfer_length;
711 ssize_t writecount = 0;
712
713 if (mutex_lock_interruptible(&usblp->wmut)) {
714 rv = -EINTR;
715 goto raise_biglock;
716 }
717 if ((rv = usblp_wwait(usblp, !!(file->f_flags & O_NONBLOCK))) < 0)
718 goto raise_wait;
719
720 while (writecount < count) {
721 /*
722 * Step 1: Submit next block.
723 */
724 if ((transfer_length = count - writecount) > USBLP_BUF_SIZE)
725 transfer_length = USBLP_BUF_SIZE;
726
727 rv = -ENOMEM;
728 if ((writeurb = usblp_new_writeurb(usblp, transfer_length)) == NULL)
729 goto raise_urb;
730 usb_anchor_urb(writeurb, &usblp->urbs);
731
732 if (copy_from_user(writeurb->transfer_buffer,
733 buffer + writecount, transfer_length)) {
734 rv = -EFAULT;
735 goto raise_badaddr;
736 }
737
738 spin_lock_irq(&usblp->lock);
739 usblp->wcomplete = 0;
740 spin_unlock_irq(&usblp->lock);
741 if ((rv = usb_submit_urb(writeurb, GFP_KERNEL)) < 0) {
742 usblp->wstatus = 0;
743 spin_lock_irq(&usblp->lock);
744 usblp->no_paper = 0;
745 usblp->wcomplete = 1;
746 wake_up(&usblp->wwait);
747 spin_unlock_irq(&usblp->lock);
748 if (rv != -ENOMEM)
749 rv = -EIO;
750 goto raise_submit;
751 }
752
753 /*
754 * Step 2: Wait for transfer to end, collect results.
755 */
756 rv = usblp_wwait(usblp, !!(file->f_flags&O_NONBLOCK));
757 if (rv < 0) {
758 if (rv == -EAGAIN) {
759 /* Presume that it's going to complete well. */
760 writecount += transfer_length;
761 }
762 if (rv == -ENOSPC) {
763 spin_lock_irq(&usblp->lock);
764 usblp->no_paper = 1; /* Mark for poll(2) */
765 spin_unlock_irq(&usblp->lock);
766 writecount += transfer_length;
767 }
768 /* Leave URB dangling, to be cleaned on close. */
769 goto collect_error;
770 }
771
772 if (usblp->wstatus < 0) {
773 rv = -EIO;
774 goto collect_error;
775 }
776 /*
777 * This is critical: it must be our URB, not other writer's.
778 * The wmut exists mainly to cover us here.
779 */
780 writecount += usblp->wstatus;
781 }
782
783 mutex_unlock(&usblp->wmut);
784 return writecount;
785
786 raise_submit:
787 raise_badaddr:
788 usb_unanchor_urb(writeurb);
789 usb_free_urb(writeurb);
790 raise_urb:
791 raise_wait:
792 collect_error: /* Out of raise sequence */
793 mutex_unlock(&usblp->wmut);
794 raise_biglock:
795 return writecount ? writecount : rv;
796 }
797
798 /*
799 * Notice that we fail to restart in a few cases: on EFAULT, on restart
800 * error, etc. This is the historical behaviour. In all such cases we return
801 * EIO, and applications loop in order to get the new read going.
802 */
803 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t len, loff_t *ppos)
804 {
805 struct usblp *usblp = file->private_data;
806 ssize_t count;
807 ssize_t avail;
808 int rv;
809
810 if (!usblp->bidir)
811 return -EINVAL;
812
813 rv = usblp_rwait_and_lock(usblp, !!(file->f_flags & O_NONBLOCK));
814 if (rv < 0)
815 return rv;
816
817 if ((avail = usblp->rstatus) < 0) {
818 printk(KERN_ERR "usblp%d: error %d reading from printer\n",
819 usblp->minor, (int)avail);
820 usblp_submit_read(usblp);
821 count = -EIO;
822 goto done;
823 }
824
825 count = len < avail - usblp->readcount ? len : avail - usblp->readcount;
826 if (count != 0 &&
827 copy_to_user(buffer, usblp->readbuf + usblp->readcount, count)) {
828 count = -EFAULT;
829 goto done;
830 }
831
832 if ((usblp->readcount += count) == avail) {
833 if (usblp_submit_read(usblp) < 0) {
834 /* We don't want to leak USB return codes into errno. */
835 if (count == 0)
836 count = -EIO;
837 goto done;
838 }
839 }
840
841 done:
842 mutex_unlock(&usblp->mut);
843 return count;
844 }
845
846 /*
847 * Wait for the write path to come idle.
848 * This is called under the ->wmut, so the idle path stays idle.
849 *
850 * Our write path has a peculiar property: it does not buffer like a tty,
851 * but waits for the write to succeed. This allows our ->release to bug out
852 * without waiting for writes to drain. But it obviously does not work
853 * when O_NONBLOCK is set. So, applications setting O_NONBLOCK must use
854 * select(2) or poll(2) to wait for the buffer to drain before closing.
855 * Alternatively, set blocking mode with fcntl and issue a zero-size write.
856 */
857 static int usblp_wwait(struct usblp *usblp, int nonblock)
858 {
859 DECLARE_WAITQUEUE(waita, current);
860 int rc;
861 int err = 0;
862
863 add_wait_queue(&usblp->wwait, &waita);
864 for (;;) {
865 set_current_state(TASK_INTERRUPTIBLE);
866 if (mutex_lock_interruptible(&usblp->mut)) {
867 rc = -EINTR;
868 break;
869 }
870 rc = usblp_wtest(usblp, nonblock);
871 mutex_unlock(&usblp->mut);
872 if (rc <= 0)
873 break;
874
875 if (schedule_timeout(msecs_to_jiffies(1500)) == 0) {
876 if (usblp->flags & LP_ABORT) {
877 err = usblp_check_status(usblp, err);
878 if (err == 1) { /* Paper out */
879 rc = -ENOSPC;
880 break;
881 }
882 } else {
883 /* Prod the printer, Gentoo#251237. */
884 mutex_lock(&usblp->mut);
885 usblp_read_status(usblp, usblp->statusbuf);
886 mutex_unlock(&usblp->mut);
887 }
888 }
889 }
890 set_current_state(TASK_RUNNING);
891 remove_wait_queue(&usblp->wwait, &waita);
892 return rc;
893 }
894
895 static int usblp_wtest(struct usblp *usblp, int nonblock)
896 {
897 unsigned long flags;
898
899 if (!usblp->present)
900 return -ENODEV;
901 if (signal_pending(current))
902 return -EINTR;
903 spin_lock_irqsave(&usblp->lock, flags);
904 if (usblp->wcomplete) {
905 spin_unlock_irqrestore(&usblp->lock, flags);
906 return 0;
907 }
908 spin_unlock_irqrestore(&usblp->lock, flags);
909 if (nonblock)
910 return -EAGAIN;
911 return 1;
912 }
913
914 /*
915 * Wait for read bytes to become available. This probably should have been
916 * called usblp_r_lock_and_wait(), because we lock first. But it's a traditional
917 * name for functions which lock and return.
918 *
919 * We do not use wait_event_interruptible because it makes locking iffy.
920 */
921 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock)
922 {
923 DECLARE_WAITQUEUE(waita, current);
924 int rc;
925
926 add_wait_queue(&usblp->rwait, &waita);
927 for (;;) {
928 if (mutex_lock_interruptible(&usblp->mut)) {
929 rc = -EINTR;
930 break;
931 }
932 set_current_state(TASK_INTERRUPTIBLE);
933 if ((rc = usblp_rtest(usblp, nonblock)) < 0) {
934 mutex_unlock(&usblp->mut);
935 break;
936 }
937 if (rc == 0) /* Keep it locked */
938 break;
939 mutex_unlock(&usblp->mut);
940 schedule();
941 }
942 set_current_state(TASK_RUNNING);
943 remove_wait_queue(&usblp->rwait, &waita);
944 return rc;
945 }
946
947 static int usblp_rtest(struct usblp *usblp, int nonblock)
948 {
949 unsigned long flags;
950
951 if (!usblp->present)
952 return -ENODEV;
953 if (signal_pending(current))
954 return -EINTR;
955 spin_lock_irqsave(&usblp->lock, flags);
956 if (usblp->rcomplete) {
957 spin_unlock_irqrestore(&usblp->lock, flags);
958 return 0;
959 }
960 spin_unlock_irqrestore(&usblp->lock, flags);
961 if (nonblock)
962 return -EAGAIN;
963 return 1;
964 }
965
966 /*
967 * Please check ->bidir and other such things outside for now.
968 */
969 static int usblp_submit_read(struct usblp *usblp)
970 {
971 struct urb *urb;
972 unsigned long flags;
973 int rc;
974
975 rc = -ENOMEM;
976 if ((urb = usb_alloc_urb(0, GFP_KERNEL)) == NULL)
977 goto raise_urb;
978
979 usb_fill_bulk_urb(urb, usblp->dev,
980 usb_rcvbulkpipe(usblp->dev,
981 usblp->protocol[usblp->current_protocol].epread->bEndpointAddress),
982 usblp->readbuf, USBLP_BUF_SIZE_IN,
983 usblp_bulk_read, usblp);
984 usb_anchor_urb(urb, &usblp->urbs);
985
986 spin_lock_irqsave(&usblp->lock, flags);
987 usblp->readcount = 0; /* XXX Why here? */
988 usblp->rcomplete = 0;
989 spin_unlock_irqrestore(&usblp->lock, flags);
990 if ((rc = usb_submit_urb(urb, GFP_KERNEL)) < 0) {
991 dbg("error submitting urb (%d)", rc);
992 spin_lock_irqsave(&usblp->lock, flags);
993 usblp->rstatus = rc;
994 usblp->rcomplete = 1;
995 spin_unlock_irqrestore(&usblp->lock, flags);
996 goto raise_submit;
997 }
998
999 return 0;
1000
1001 raise_submit:
1002 usb_unanchor_urb(urb);
1003 usb_free_urb(urb);
1004 raise_urb:
1005 return rc;
1006 }
1007
1008 /*
1009 * Checks for printers that have quirks, such as requiring unidirectional
1010 * communication but reporting bidirectional; currently some HP printers
1011 * have this flaw (HP 810, 880, 895, etc.), or needing an init string
1012 * sent at each open (like some Epsons).
1013 * Returns 1 if found, 0 if not found.
1014 *
1015 * HP recommended that we use the bidirectional interface but
1016 * don't attempt any bulk IN transfers from the IN endpoint.
1017 * Here's some more detail on the problem:
1018 * The problem is not that it isn't bidirectional though. The problem
1019 * is that if you request a device ID, or status information, while
1020 * the buffers are full, the return data will end up in the print data
1021 * buffer. For example if you make sure you never request the device ID
1022 * while you are sending print data, and you don't try to query the
1023 * printer status every couple of milliseconds, you will probably be OK.
1024 */
1025 static unsigned int usblp_quirks(__u16 vendor, __u16 product)
1026 {
1027 int i;
1028
1029 for (i = 0; quirk_printers[i].vendorId; i++) {
1030 if (vendor == quirk_printers[i].vendorId &&
1031 product == quirk_printers[i].productId)
1032 return quirk_printers[i].quirks;
1033 }
1034 return 0;
1035 }
1036
1037 static const struct file_operations usblp_fops = {
1038 .owner = THIS_MODULE,
1039 .read = usblp_read,
1040 .write = usblp_write,
1041 .poll = usblp_poll,
1042 .unlocked_ioctl = usblp_ioctl,
1043 .compat_ioctl = usblp_ioctl,
1044 .open = usblp_open,
1045 .release = usblp_release,
1046 .llseek = noop_llseek,
1047 };
1048
1049 static char *usblp_devnode(struct device *dev, mode_t *mode)
1050 {
1051 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
1052 }
1053
1054 static struct usb_class_driver usblp_class = {
1055 .name = "lp%d",
1056 .devnode = usblp_devnode,
1057 .fops = &usblp_fops,
1058 .minor_base = USBLP_MINOR_BASE,
1059 };
1060
1061 static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf)
1062 {
1063 struct usb_interface *intf = to_usb_interface(dev);
1064 struct usblp *usblp = usb_get_intfdata(intf);
1065
1066 if (usblp->device_id_string[0] == 0 &&
1067 usblp->device_id_string[1] == 0)
1068 return 0;
1069
1070 return sprintf(buf, "%s", usblp->device_id_string+2);
1071 }
1072
1073 static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL);
1074
1075 static int usblp_probe(struct usb_interface *intf,
1076 const struct usb_device_id *id)
1077 {
1078 struct usb_device *dev = interface_to_usbdev(intf);
1079 struct usblp *usblp;
1080 int protocol;
1081 int retval;
1082
1083 /* Malloc and start initializing usblp structure so we can use it
1084 * directly. */
1085 usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL);
1086 if (!usblp) {
1087 retval = -ENOMEM;
1088 goto abort_ret;
1089 }
1090 usblp->dev = dev;
1091 mutex_init(&usblp->wmut);
1092 mutex_init(&usblp->mut);
1093 spin_lock_init(&usblp->lock);
1094 init_waitqueue_head(&usblp->rwait);
1095 init_waitqueue_head(&usblp->wwait);
1096 init_usb_anchor(&usblp->urbs);
1097 usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
1098 usblp->intf = intf;
1099
1100 /* Malloc device ID string buffer to the largest expected length,
1101 * since we can re-query it on an ioctl and a dynamic string
1102 * could change in length. */
1103 if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
1104 retval = -ENOMEM;
1105 goto abort;
1106 }
1107
1108 /*
1109 * Allocate read buffer. We somewhat wastefully
1110 * malloc both regardless of bidirectionality, because the
1111 * alternate setting can be changed later via an ioctl.
1112 */
1113 if (!(usblp->readbuf = kmalloc(USBLP_BUF_SIZE_IN, GFP_KERNEL))) {
1114 retval = -ENOMEM;
1115 goto abort;
1116 }
1117
1118 /* Allocate buffer for printer status */
1119 usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
1120 if (!usblp->statusbuf) {
1121 retval = -ENOMEM;
1122 goto abort;
1123 }
1124
1125 /* Lookup quirks for this printer. */
1126 usblp->quirks = usblp_quirks(
1127 le16_to_cpu(dev->descriptor.idVendor),
1128 le16_to_cpu(dev->descriptor.idProduct));
1129
1130 /* Analyze and pick initial alternate settings and endpoints. */
1131 protocol = usblp_select_alts(usblp);
1132 if (protocol < 0) {
1133 dbg("incompatible printer-class device 0x%4.4X/0x%4.4X",
1134 le16_to_cpu(dev->descriptor.idVendor),
1135 le16_to_cpu(dev->descriptor.idProduct));
1136 retval = -ENODEV;
1137 goto abort;
1138 }
1139
1140 /* Setup the selected alternate setting and endpoints. */
1141 if (usblp_set_protocol(usblp, protocol) < 0) {
1142 retval = -ENODEV; /* ->probe isn't ->ioctl */
1143 goto abort;
1144 }
1145
1146 /* Retrieve and store the device ID string. */
1147 usblp_cache_device_id_string(usblp);
1148 retval = device_create_file(&intf->dev, &dev_attr_ieee1284_id);
1149 if (retval)
1150 goto abort_intfdata;
1151
1152 #ifdef DEBUG
1153 usblp_check_status(usblp, 0);
1154 #endif
1155
1156 usb_set_intfdata(intf, usblp);
1157
1158 usblp->present = 1;
1159
1160 retval = usb_register_dev(intf, &usblp_class);
1161 if (retval) {
1162 printk(KERN_ERR "usblp: Not able to get a minor"
1163 " (base %u, slice default): %d\n",
1164 USBLP_MINOR_BASE, retval);
1165 goto abort_intfdata;
1166 }
1167 usblp->minor = intf->minor;
1168 printk(KERN_INFO "usblp%d: USB %sdirectional printer dev %d "
1169 "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X\n",
1170 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
1171 usblp->ifnum,
1172 usblp->protocol[usblp->current_protocol].alt_setting,
1173 usblp->current_protocol,
1174 le16_to_cpu(usblp->dev->descriptor.idVendor),
1175 le16_to_cpu(usblp->dev->descriptor.idProduct));
1176
1177 return 0;
1178
1179 abort_intfdata:
1180 usb_set_intfdata(intf, NULL);
1181 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1182 abort:
1183 kfree(usblp->readbuf);
1184 kfree(usblp->statusbuf);
1185 kfree(usblp->device_id_string);
1186 kfree(usblp);
1187 abort_ret:
1188 return retval;
1189 }
1190
1191 /*
1192 * We are a "new" style driver with usb_device_id table,
1193 * but our requirements are too intricate for simple match to handle.
1194 *
1195 * The "proto_bias" option may be used to specify the preferred protocol
1196 * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3). If the device
1197 * supports the preferred protocol, then we bind to it.
1198 *
1199 * The best interface for us is 7/1/2, because it is compatible
1200 * with a stream of characters. If we find it, we bind to it.
1201 *
1202 * Note that the people from hpoj.sourceforge.net need to be able to
1203 * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
1204 *
1205 * Failing 7/1/2, we look for 7/1/3, even though it's probably not
1206 * stream-compatible, because this matches the behaviour of the old code.
1207 *
1208 * If nothing else, we bind to 7/1/1 - the unidirectional interface.
1209 */
1210 static int usblp_select_alts(struct usblp *usblp)
1211 {
1212 struct usb_interface *if_alt;
1213 struct usb_host_interface *ifd;
1214 struct usb_endpoint_descriptor *epd, *epwrite, *epread;
1215 int p, i, e;
1216
1217 if_alt = usblp->intf;
1218
1219 for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1220 usblp->protocol[p].alt_setting = -1;
1221
1222 /* Find out what we have. */
1223 for (i = 0; i < if_alt->num_altsetting; i++) {
1224 ifd = &if_alt->altsetting[i];
1225
1226 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
1227 if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS))
1228 continue;
1229
1230 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1231 ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1232 continue;
1233
1234 /* Look for bulk OUT and IN endpoints. */
1235 epwrite = epread = NULL;
1236 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1237 epd = &ifd->endpoint[e].desc;
1238
1239 if (usb_endpoint_is_bulk_out(epd))
1240 if (!epwrite)
1241 epwrite = epd;
1242
1243 if (usb_endpoint_is_bulk_in(epd))
1244 if (!epread)
1245 epread = epd;
1246 }
1247
1248 /* Ignore buggy hardware without the right endpoints. */
1249 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1250 continue;
1251
1252 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1253 * and buggy bidirectional printers. */
1254 if (ifd->desc.bInterfaceProtocol == 1) {
1255 epread = NULL;
1256 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1257 printk(KERN_INFO "usblp%d: Disabling reads from "
1258 "problematic bidirectional printer\n",
1259 usblp->minor);
1260 epread = NULL;
1261 }
1262
1263 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1264 ifd->desc.bAlternateSetting;
1265 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1266 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1267 }
1268
1269 /* If our requested protocol is supported, then use it. */
1270 if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1271 proto_bias <= USBLP_LAST_PROTOCOL &&
1272 usblp->protocol[proto_bias].alt_setting != -1)
1273 return proto_bias;
1274
1275 /* Ordering is important here. */
1276 if (usblp->protocol[2].alt_setting != -1)
1277 return 2;
1278 if (usblp->protocol[1].alt_setting != -1)
1279 return 1;
1280 if (usblp->protocol[3].alt_setting != -1)
1281 return 3;
1282
1283 /* If nothing is available, then don't bind to this device. */
1284 return -1;
1285 }
1286
1287 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1288 {
1289 int r, alts;
1290
1291 if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1292 return -EINVAL;
1293
1294 alts = usblp->protocol[protocol].alt_setting;
1295 if (alts < 0)
1296 return -EINVAL;
1297 r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1298 if (r < 0) {
1299 printk(KERN_ERR "usblp: can't set desired altsetting %d on interface %d\n",
1300 alts, usblp->ifnum);
1301 return r;
1302 }
1303
1304 usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1305 usblp->current_protocol = protocol;
1306 dbg("usblp%d set protocol %d", usblp->minor, protocol);
1307 return 0;
1308 }
1309
1310 /* Retrieves and caches device ID string.
1311 * Returns length, including length bytes but not null terminator.
1312 * On error, returns a negative errno value. */
1313 static int usblp_cache_device_id_string(struct usblp *usblp)
1314 {
1315 int err, length;
1316
1317 err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1318 if (err < 0) {
1319 dbg("usblp%d: error = %d reading IEEE-1284 Device ID string",
1320 usblp->minor, err);
1321 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1322 return -EIO;
1323 }
1324
1325 /* First two bytes are length in big-endian.
1326 * They count themselves, and we copy them into
1327 * the user's buffer. */
1328 length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1329 if (length < 2)
1330 length = 2;
1331 else if (length >= USBLP_DEVICE_ID_SIZE)
1332 length = USBLP_DEVICE_ID_SIZE - 1;
1333 usblp->device_id_string[length] = '\0';
1334
1335 dbg("usblp%d Device ID string [len=%d]=\"%s\"",
1336 usblp->minor, length, &usblp->device_id_string[2]);
1337
1338 return length;
1339 }
1340
1341 static void usblp_disconnect(struct usb_interface *intf)
1342 {
1343 struct usblp *usblp = usb_get_intfdata(intf);
1344
1345 usb_deregister_dev(intf, &usblp_class);
1346
1347 if (!usblp || !usblp->dev) {
1348 dev_err(&intf->dev, "bogus disconnect\n");
1349 BUG();
1350 }
1351
1352 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1353
1354 mutex_lock(&usblp_mutex);
1355 mutex_lock(&usblp->mut);
1356 usblp->present = 0;
1357 wake_up(&usblp->wwait);
1358 wake_up(&usblp->rwait);
1359 usb_set_intfdata(intf, NULL);
1360
1361 usblp_unlink_urbs(usblp);
1362 mutex_unlock(&usblp->mut);
1363
1364 if (!usblp->used)
1365 usblp_cleanup(usblp);
1366 mutex_unlock(&usblp_mutex);
1367 }
1368
1369 static int usblp_suspend(struct usb_interface *intf, pm_message_t message)
1370 {
1371 struct usblp *usblp = usb_get_intfdata(intf);
1372
1373 usblp_unlink_urbs(usblp);
1374 #if 0 /* XXX Do we want this? What if someone is reading, should we fail? */
1375 /* not strictly necessary, but just in case */
1376 wake_up(&usblp->wwait);
1377 wake_up(&usblp->rwait);
1378 #endif
1379
1380 return 0;
1381 }
1382
1383 static int usblp_resume(struct usb_interface *intf)
1384 {
1385 struct usblp *usblp = usb_get_intfdata(intf);
1386 int r;
1387
1388 r = handle_bidir(usblp);
1389
1390 return r;
1391 }
1392
1393 static const struct usb_device_id usblp_ids[] = {
1394 { USB_DEVICE_INFO(7, 1, 1) },
1395 { USB_DEVICE_INFO(7, 1, 2) },
1396 { USB_DEVICE_INFO(7, 1, 3) },
1397 { USB_INTERFACE_INFO(7, 1, 1) },
1398 { USB_INTERFACE_INFO(7, 1, 2) },
1399 { USB_INTERFACE_INFO(7, 1, 3) },
1400 { USB_DEVICE(0x04b8, 0x0202) }, /* Seiko Epson Receipt Printer M129C */
1401 { } /* Terminating entry */
1402 };
1403
1404 MODULE_DEVICE_TABLE(usb, usblp_ids);
1405
1406 static struct usb_driver usblp_driver = {
1407 .name = "usblp",
1408 .probe = usblp_probe,
1409 .disconnect = usblp_disconnect,
1410 .suspend = usblp_suspend,
1411 .resume = usblp_resume,
1412 .id_table = usblp_ids,
1413 .supports_autosuspend = 1,
1414 };
1415
1416 static int __init usblp_init(void)
1417 {
1418 return usb_register(&usblp_driver);
1419 }
1420
1421 static void __exit usblp_exit(void)
1422 {
1423 usb_deregister(&usblp_driver);
1424 }
1425
1426 module_init(usblp_init);
1427 module_exit(usblp_exit);
1428
1429 MODULE_AUTHOR(DRIVER_AUTHOR);
1430 MODULE_DESCRIPTION(DRIVER_DESC);
1431 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1432 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1433 MODULE_LICENSE("GPL");
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