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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#include <linux/ratelimit.h>
62
63/*
64 * Version Information
65 */
66#define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal"
67#define DRIVER_DESC "USB Printer Device Class driver"
68
69#define USBLP_BUF_SIZE 8192
70#define USBLP_BUF_SIZE_IN 1024
71#define USBLP_DEVICE_ID_SIZE 1024
72
73/* ioctls: */
74#define IOCNR_GET_DEVICE_ID 1
75#define IOCNR_GET_PROTOCOLS 2
76#define IOCNR_SET_PROTOCOL 3
77#define IOCNR_HP_SET_CHANNEL 4
78#define IOCNR_GET_BUS_ADDRESS 5
79#define IOCNR_GET_VID_PID 6
80#define IOCNR_SOFT_RESET 7
81/* Get device_id string: */
82#define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len)
83/* The following ioctls were added for http://hpoj.sourceforge.net: */
84/* Get two-int array:
85 * [0]=current protocol (1=7/1/1, 2=7/1/2, 3=7/1/3),
86 * [1]=supported protocol mask (mask&(1<<n)!=0 means 7/1/n supported): */
87#define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
88/* Set protocol (arg: 1=7/1/1, 2=7/1/2, 3=7/1/3): */
89#define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0)
90/* Set channel number (HP Vendor-specific command): */
91#define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0)
92/* Get two-int array: [0]=bus number, [1]=device address: */
93#define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len)
94/* Get two-int array: [0]=vendor ID, [1]=product ID: */
95#define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len)
96/* Perform class specific soft reset */
97#define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0);
98
99/*
100 * A DEVICE_ID string may include the printer's serial number.
101 * It should end with a semi-colon (';').
102 * An example from an HP 970C DeskJet printer is (this is one long string,
103 * with the serial number changed):
104MFG:HEWLETT-PACKARD;MDL:DESKJET 970C;CMD:MLC,PCL,PML;CLASS:PRINTER;DESCRIPTION:Hewlett-Packard DeskJet 970C;SERN:US970CSEPROF;VSTATUS:$HB0$NC0,ff,DN,IDLE,CUT,K1,C0,DP,NR,KP000,CP027;VP:0800,FL,B0;VJ: ;
105 */
106
107/*
108 * USB Printer Requests
109 */
110
111#define USBLP_REQ_GET_ID 0x00
112#define USBLP_REQ_GET_STATUS 0x01
113#define USBLP_REQ_RESET 0x02
114#define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST 0x00 /* HP Vendor-specific */
115
116#define USBLP_MINORS 16
117#define USBLP_MINOR_BASE 0
118
119#define USBLP_CTL_TIMEOUT 5000 /* 5 seconds */
120
121#define USBLP_FIRST_PROTOCOL 1
122#define USBLP_LAST_PROTOCOL 3
123#define USBLP_MAX_PROTOCOLS (USBLP_LAST_PROTOCOL+1)
124
125/*
126 * some arbitrary status buffer size;
127 * need a status buffer that is allocated via kmalloc(), not on stack
128 */
129#define STATUS_BUF_SIZE 8
130
131/*
132 * Locks down the locking order:
133 * ->wmut locks wstatus.
134 * ->mut locks the whole usblp, except [rw]complete, and thus, by indirection,
135 * [rw]status. We only touch status when we know the side idle.
136 * ->lock locks what interrupt accesses.
137 */
138struct usblp {
139 struct usb_device *dev; /* USB device */
140 struct mutex wmut;
141 struct mutex mut;
142 spinlock_t lock; /* locks rcomplete, wcomplete */
143 char *readbuf; /* read transfer_buffer */
144 char *statusbuf; /* status transfer_buffer */
145 struct usb_anchor urbs;
146 wait_queue_head_t rwait, wwait;
147 int readcount; /* Counter for reads */
148 int ifnum; /* Interface number */
149 struct usb_interface *intf; /* The interface */
150 /* Alternate-setting numbers and endpoints for each protocol
151 * (7/1/{index=1,2,3}) that the device supports: */
152 struct {
153 int alt_setting;
154 struct usb_endpoint_descriptor *epwrite;
155 struct usb_endpoint_descriptor *epread;
156 } protocol[USBLP_MAX_PROTOCOLS];
157 int current_protocol;
158 int minor; /* minor number of device */
159 int wcomplete, rcomplete;
160 int wstatus; /* bytes written or error */
161 int rstatus; /* bytes ready or error */
162 unsigned int quirks; /* quirks flags */
163 unsigned int flags; /* mode flags */
164 unsigned char used; /* True if open */
165 unsigned char present; /* True if not disconnected */
166 unsigned char bidir; /* interface is bidirectional */
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
173static void usblp_dump(struct usblp *usblp)
174{
175 int p;
176
177 dbg("usblp=0x%p", usblp);
178 dbg("dev=0x%p", usblp->dev);
179 dbg("present=%d", usblp->present);
180 dbg("readbuf=0x%p", usblp->readbuf);
181 dbg("readcount=%d", usblp->readcount);
182 dbg("ifnum=%d", usblp->ifnum);
183 for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
184 dbg("protocol[%d].alt_setting=%d", p, usblp->protocol[p].alt_setting);
185 dbg("protocol[%d].epwrite=%p", p, usblp->protocol[p].epwrite);
186 dbg("protocol[%d].epread=%p", p, usblp->protocol[p].epread);
187 }
188 dbg("current_protocol=%d", usblp->current_protocol);
189 dbg("minor=%d", usblp->minor);
190 dbg("wstatus=%d", usblp->wstatus);
191 dbg("rstatus=%d", usblp->rstatus);
192 dbg("quirks=%d", usblp->quirks);
193 dbg("used=%d", usblp->used);
194 dbg("bidir=%d", usblp->bidir);
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
204struct 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
214static 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 { 0x04f9, 0x000d, USBLP_QUIRK_BIDIR }, /* Brother Industries, Ltd HL-1440 Laser Printer */
230 { 0x04b8, 0x0202, USBLP_QUIRK_BAD_CLASS }, /* Seiko Epson Receipt Printer M129C */
231 { 0, 0 }
232};
233
234static int usblp_wwait(struct usblp *usblp, int nonblock);
235static int usblp_wtest(struct usblp *usblp, int nonblock);
236static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock);
237static int usblp_rtest(struct usblp *usblp, int nonblock);
238static int usblp_submit_read(struct usblp *usblp);
239static int usblp_select_alts(struct usblp *usblp);
240static int usblp_set_protocol(struct usblp *usblp, int protocol);
241static int usblp_cache_device_id_string(struct usblp *usblp);
242
243/* forward reference to make our lives easier */
244static struct usb_driver usblp_driver;
245static DEFINE_MUTEX(usblp_mutex); /* locks the existence of usblp's */
246
247/*
248 * Functions for usblp control messages.
249 */
250
251static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
252{
253 int retval;
254 int index = usblp->ifnum;
255
256 /* High byte has the interface index.
257 Low byte has the alternate setting.
258 */
259 if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS))
260 index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
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 */
285static int proto_bias = -1;
286
287/*
288 * URB callback.
289 */
290
291static 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
314static 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
342static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
343
344static 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 printk_ratelimited(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
375static 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
388static 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 }
434out:
435 mutex_unlock(&usblp_mutex);
436 return retval;
437}
438
439static 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
449static void usblp_unlink_urbs(struct usblp *usblp)
450{
451 usb_kill_anchored_urbs(&usblp->urbs);
452}
453
454static 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 */
472static 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
488static 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 printk_ratelimited(KERN_ERR "usblp%d:"
657 "failed reading printer status (%d)\n",
658 usblp->minor, retval);
659 retval = -EIO;
660 goto done;
661 }
662 status = *usblp->statusbuf;
663 if (copy_to_user((void __user *)arg, &status, sizeof(int)))
664 retval = -EFAULT;
665 break;
666
667 case LPABORT:
668 if (arg)
669 usblp->flags |= LP_ABORT;
670 else
671 usblp->flags &= ~LP_ABORT;
672 break;
673
674 default:
675 retval = -ENOTTY;
676 }
677
678done:
679 mutex_unlock(&usblp->mut);
680 return retval;
681}
682
683static struct urb *usblp_new_writeurb(struct usblp *usblp, int transfer_length)
684{
685 struct urb *urb;
686 char *writebuf;
687
688 if ((writebuf = kmalloc(transfer_length, GFP_KERNEL)) == NULL)
689 return NULL;
690 if ((urb = usb_alloc_urb(0, GFP_KERNEL)) == NULL) {
691 kfree(writebuf);
692 return NULL;
693 }
694
695 usb_fill_bulk_urb(urb, usblp->dev,
696 usb_sndbulkpipe(usblp->dev,
697 usblp->protocol[usblp->current_protocol].epwrite->bEndpointAddress),
698 writebuf, transfer_length, usblp_bulk_write, usblp);
699 urb->transfer_flags |= URB_FREE_BUFFER;
700
701 return urb;
702}
703
704static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
705{
706 struct usblp *usblp = file->private_data;
707 struct urb *writeurb;
708 int rv;
709 int transfer_length;
710 ssize_t writecount = 0;
711
712 if (mutex_lock_interruptible(&usblp->wmut)) {
713 rv = -EINTR;
714 goto raise_biglock;
715 }
716 if ((rv = usblp_wwait(usblp, !!(file->f_flags & O_NONBLOCK))) < 0)
717 goto raise_wait;
718
719 while (writecount < count) {
720 /*
721 * Step 1: Submit next block.
722 */
723 if ((transfer_length = count - writecount) > USBLP_BUF_SIZE)
724 transfer_length = USBLP_BUF_SIZE;
725
726 rv = -ENOMEM;
727 if ((writeurb = usblp_new_writeurb(usblp, transfer_length)) == NULL)
728 goto raise_urb;
729 usb_anchor_urb(writeurb, &usblp->urbs);
730
731 if (copy_from_user(writeurb->transfer_buffer,
732 buffer + writecount, transfer_length)) {
733 rv = -EFAULT;
734 goto raise_badaddr;
735 }
736
737 spin_lock_irq(&usblp->lock);
738 usblp->wcomplete = 0;
739 spin_unlock_irq(&usblp->lock);
740 if ((rv = usb_submit_urb(writeurb, GFP_KERNEL)) < 0) {
741 usblp->wstatus = 0;
742 spin_lock_irq(&usblp->lock);
743 usblp->no_paper = 0;
744 usblp->wcomplete = 1;
745 wake_up(&usblp->wwait);
746 spin_unlock_irq(&usblp->lock);
747 if (rv != -ENOMEM)
748 rv = -EIO;
749 goto raise_submit;
750 }
751
752 /*
753 * Step 2: Wait for transfer to end, collect results.
754 */
755 rv = usblp_wwait(usblp, !!(file->f_flags&O_NONBLOCK));
756 if (rv < 0) {
757 if (rv == -EAGAIN) {
758 /* Presume that it's going to complete well. */
759 writecount += transfer_length;
760 }
761 if (rv == -ENOSPC) {
762 spin_lock_irq(&usblp->lock);
763 usblp->no_paper = 1; /* Mark for poll(2) */
764 spin_unlock_irq(&usblp->lock);
765 writecount += transfer_length;
766 }
767 /* Leave URB dangling, to be cleaned on close. */
768 goto collect_error;
769 }
770
771 if (usblp->wstatus < 0) {
772 rv = -EIO;
773 goto collect_error;
774 }
775 /*
776 * This is critical: it must be our URB, not other writer's.
777 * The wmut exists mainly to cover us here.
778 */
779 writecount += usblp->wstatus;
780 }
781
782 mutex_unlock(&usblp->wmut);
783 return writecount;
784
785raise_submit:
786raise_badaddr:
787 usb_unanchor_urb(writeurb);
788 usb_free_urb(writeurb);
789raise_urb:
790raise_wait:
791collect_error: /* Out of raise sequence */
792 mutex_unlock(&usblp->wmut);
793raise_biglock:
794 return writecount ? writecount : rv;
795}
796
797/*
798 * Notice that we fail to restart in a few cases: on EFAULT, on restart
799 * error, etc. This is the historical behaviour. In all such cases we return
800 * EIO, and applications loop in order to get the new read going.
801 */
802static ssize_t usblp_read(struct file *file, char __user *buffer, size_t len, loff_t *ppos)
803{
804 struct usblp *usblp = file->private_data;
805 ssize_t count;
806 ssize_t avail;
807 int rv;
808
809 if (!usblp->bidir)
810 return -EINVAL;
811
812 rv = usblp_rwait_and_lock(usblp, !!(file->f_flags & O_NONBLOCK));
813 if (rv < 0)
814 return rv;
815
816 if ((avail = usblp->rstatus) < 0) {
817 printk(KERN_ERR "usblp%d: error %d reading from printer\n",
818 usblp->minor, (int)avail);
819 usblp_submit_read(usblp);
820 count = -EIO;
821 goto done;
822 }
823
824 count = len < avail - usblp->readcount ? len : avail - usblp->readcount;
825 if (count != 0 &&
826 copy_to_user(buffer, usblp->readbuf + usblp->readcount, count)) {
827 count = -EFAULT;
828 goto done;
829 }
830
831 if ((usblp->readcount += count) == avail) {
832 if (usblp_submit_read(usblp) < 0) {
833 /* We don't want to leak USB return codes into errno. */
834 if (count == 0)
835 count = -EIO;
836 goto done;
837 }
838 }
839
840done:
841 mutex_unlock(&usblp->mut);
842 return count;
843}
844
845/*
846 * Wait for the write path to come idle.
847 * This is called under the ->wmut, so the idle path stays idle.
848 *
849 * Our write path has a peculiar property: it does not buffer like a tty,
850 * but waits for the write to succeed. This allows our ->release to bug out
851 * without waiting for writes to drain. But it obviously does not work
852 * when O_NONBLOCK is set. So, applications setting O_NONBLOCK must use
853 * select(2) or poll(2) to wait for the buffer to drain before closing.
854 * Alternatively, set blocking mode with fcntl and issue a zero-size write.
855 */
856static int usblp_wwait(struct usblp *usblp, int nonblock)
857{
858 DECLARE_WAITQUEUE(waita, current);
859 int rc;
860 int err = 0;
861
862 add_wait_queue(&usblp->wwait, &waita);
863 for (;;) {
864 set_current_state(TASK_INTERRUPTIBLE);
865 if (mutex_lock_interruptible(&usblp->mut)) {
866 rc = -EINTR;
867 break;
868 }
869 rc = usblp_wtest(usblp, nonblock);
870 mutex_unlock(&usblp->mut);
871 if (rc <= 0)
872 break;
873
874 if (schedule_timeout(msecs_to_jiffies(1500)) == 0) {
875 if (usblp->flags & LP_ABORT) {
876 err = usblp_check_status(usblp, err);
877 if (err == 1) { /* Paper out */
878 rc = -ENOSPC;
879 break;
880 }
881 } else {
882 /* Prod the printer, Gentoo#251237. */
883 mutex_lock(&usblp->mut);
884 usblp_read_status(usblp, usblp->statusbuf);
885 mutex_unlock(&usblp->mut);
886 }
887 }
888 }
889 set_current_state(TASK_RUNNING);
890 remove_wait_queue(&usblp->wwait, &waita);
891 return rc;
892}
893
894static int usblp_wtest(struct usblp *usblp, int nonblock)
895{
896 unsigned long flags;
897
898 if (!usblp->present)
899 return -ENODEV;
900 if (signal_pending(current))
901 return -EINTR;
902 spin_lock_irqsave(&usblp->lock, flags);
903 if (usblp->wcomplete) {
904 spin_unlock_irqrestore(&usblp->lock, flags);
905 return 0;
906 }
907 spin_unlock_irqrestore(&usblp->lock, flags);
908 if (nonblock)
909 return -EAGAIN;
910 return 1;
911}
912
913/*
914 * Wait for read bytes to become available. This probably should have been
915 * called usblp_r_lock_and_wait(), because we lock first. But it's a traditional
916 * name for functions which lock and return.
917 *
918 * We do not use wait_event_interruptible because it makes locking iffy.
919 */
920static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock)
921{
922 DECLARE_WAITQUEUE(waita, current);
923 int rc;
924
925 add_wait_queue(&usblp->rwait, &waita);
926 for (;;) {
927 if (mutex_lock_interruptible(&usblp->mut)) {
928 rc = -EINTR;
929 break;
930 }
931 set_current_state(TASK_INTERRUPTIBLE);
932 if ((rc = usblp_rtest(usblp, nonblock)) < 0) {
933 mutex_unlock(&usblp->mut);
934 break;
935 }
936 if (rc == 0) /* Keep it locked */
937 break;
938 mutex_unlock(&usblp->mut);
939 schedule();
940 }
941 set_current_state(TASK_RUNNING);
942 remove_wait_queue(&usblp->rwait, &waita);
943 return rc;
944}
945
946static int usblp_rtest(struct usblp *usblp, int nonblock)
947{
948 unsigned long flags;
949
950 if (!usblp->present)
951 return -ENODEV;
952 if (signal_pending(current))
953 return -EINTR;
954 spin_lock_irqsave(&usblp->lock, flags);
955 if (usblp->rcomplete) {
956 spin_unlock_irqrestore(&usblp->lock, flags);
957 return 0;
958 }
959 spin_unlock_irqrestore(&usblp->lock, flags);
960 if (nonblock)
961 return -EAGAIN;
962 return 1;
963}
964
965/*
966 * Please check ->bidir and other such things outside for now.
967 */
968static int usblp_submit_read(struct usblp *usblp)
969{
970 struct urb *urb;
971 unsigned long flags;
972 int rc;
973
974 rc = -ENOMEM;
975 if ((urb = usb_alloc_urb(0, GFP_KERNEL)) == NULL)
976 goto raise_urb;
977
978 usb_fill_bulk_urb(urb, usblp->dev,
979 usb_rcvbulkpipe(usblp->dev,
980 usblp->protocol[usblp->current_protocol].epread->bEndpointAddress),
981 usblp->readbuf, USBLP_BUF_SIZE_IN,
982 usblp_bulk_read, usblp);
983 usb_anchor_urb(urb, &usblp->urbs);
984
985 spin_lock_irqsave(&usblp->lock, flags);
986 usblp->readcount = 0; /* XXX Why here? */
987 usblp->rcomplete = 0;
988 spin_unlock_irqrestore(&usblp->lock, flags);
989 if ((rc = usb_submit_urb(urb, GFP_KERNEL)) < 0) {
990 dbg("error submitting urb (%d)", rc);
991 spin_lock_irqsave(&usblp->lock, flags);
992 usblp->rstatus = rc;
993 usblp->rcomplete = 1;
994 spin_unlock_irqrestore(&usblp->lock, flags);
995 goto raise_submit;
996 }
997
998 return 0;
999
1000raise_submit:
1001 usb_unanchor_urb(urb);
1002 usb_free_urb(urb);
1003raise_urb:
1004 return rc;
1005}
1006
1007/*
1008 * Checks for printers that have quirks, such as requiring unidirectional
1009 * communication but reporting bidirectional; currently some HP printers
1010 * have this flaw (HP 810, 880, 895, etc.), or needing an init string
1011 * sent at each open (like some Epsons).
1012 * Returns 1 if found, 0 if not found.
1013 *
1014 * HP recommended that we use the bidirectional interface but
1015 * don't attempt any bulk IN transfers from the IN endpoint.
1016 * Here's some more detail on the problem:
1017 * The problem is not that it isn't bidirectional though. The problem
1018 * is that if you request a device ID, or status information, while
1019 * the buffers are full, the return data will end up in the print data
1020 * buffer. For example if you make sure you never request the device ID
1021 * while you are sending print data, and you don't try to query the
1022 * printer status every couple of milliseconds, you will probably be OK.
1023 */
1024static unsigned int usblp_quirks(__u16 vendor, __u16 product)
1025{
1026 int i;
1027
1028 for (i = 0; quirk_printers[i].vendorId; i++) {
1029 if (vendor == quirk_printers[i].vendorId &&
1030 product == quirk_printers[i].productId)
1031 return quirk_printers[i].quirks;
1032 }
1033 return 0;
1034}
1035
1036static const struct file_operations usblp_fops = {
1037 .owner = THIS_MODULE,
1038 .read = usblp_read,
1039 .write = usblp_write,
1040 .poll = usblp_poll,
1041 .unlocked_ioctl = usblp_ioctl,
1042 .compat_ioctl = usblp_ioctl,
1043 .open = usblp_open,
1044 .release = usblp_release,
1045 .llseek = noop_llseek,
1046};
1047
1048static char *usblp_devnode(struct device *dev, mode_t *mode)
1049{
1050 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
1051}
1052
1053static struct usb_class_driver usblp_class = {
1054 .name = "lp%d",
1055 .devnode = usblp_devnode,
1056 .fops = &usblp_fops,
1057 .minor_base = USBLP_MINOR_BASE,
1058};
1059
1060static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf)
1061{
1062 struct usb_interface *intf = to_usb_interface(dev);
1063 struct usblp *usblp = usb_get_intfdata(intf);
1064
1065 if (usblp->device_id_string[0] == 0 &&
1066 usblp->device_id_string[1] == 0)
1067 return 0;
1068
1069 return sprintf(buf, "%s", usblp->device_id_string+2);
1070}
1071
1072static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL);
1073
1074static int usblp_probe(struct usb_interface *intf,
1075 const struct usb_device_id *id)
1076{
1077 struct usb_device *dev = interface_to_usbdev(intf);
1078 struct usblp *usblp;
1079 int protocol;
1080 int retval;
1081
1082 /* Malloc and start initializing usblp structure so we can use it
1083 * directly. */
1084 usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL);
1085 if (!usblp) {
1086 retval = -ENOMEM;
1087 goto abort_ret;
1088 }
1089 usblp->dev = dev;
1090 mutex_init(&usblp->wmut);
1091 mutex_init(&usblp->mut);
1092 spin_lock_init(&usblp->lock);
1093 init_waitqueue_head(&usblp->rwait);
1094 init_waitqueue_head(&usblp->wwait);
1095 init_usb_anchor(&usblp->urbs);
1096 usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
1097 usblp->intf = intf;
1098
1099 /* Malloc device ID string buffer to the largest expected length,
1100 * since we can re-query it on an ioctl and a dynamic string
1101 * could change in length. */
1102 if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
1103 retval = -ENOMEM;
1104 goto abort;
1105 }
1106
1107 /*
1108 * Allocate read buffer. We somewhat wastefully
1109 * malloc both regardless of bidirectionality, because the
1110 * alternate setting can be changed later via an ioctl.
1111 */
1112 if (!(usblp->readbuf = kmalloc(USBLP_BUF_SIZE_IN, GFP_KERNEL))) {
1113 retval = -ENOMEM;
1114 goto abort;
1115 }
1116
1117 /* Allocate buffer for printer status */
1118 usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
1119 if (!usblp->statusbuf) {
1120 retval = -ENOMEM;
1121 goto abort;
1122 }
1123
1124 /* Lookup quirks for this printer. */
1125 usblp->quirks = usblp_quirks(
1126 le16_to_cpu(dev->descriptor.idVendor),
1127 le16_to_cpu(dev->descriptor.idProduct));
1128
1129 /* Analyze and pick initial alternate settings and endpoints. */
1130 protocol = usblp_select_alts(usblp);
1131 if (protocol < 0) {
1132 dbg("incompatible printer-class device 0x%4.4X/0x%4.4X",
1133 le16_to_cpu(dev->descriptor.idVendor),
1134 le16_to_cpu(dev->descriptor.idProduct));
1135 retval = -ENODEV;
1136 goto abort;
1137 }
1138
1139 /* Setup the selected alternate setting and endpoints. */
1140 if (usblp_set_protocol(usblp, protocol) < 0) {
1141 retval = -ENODEV; /* ->probe isn't ->ioctl */
1142 goto abort;
1143 }
1144
1145 /* Retrieve and store the device ID string. */
1146 usblp_cache_device_id_string(usblp);
1147 retval = device_create_file(&intf->dev, &dev_attr_ieee1284_id);
1148 if (retval)
1149 goto abort_intfdata;
1150
1151#ifdef DEBUG
1152 usblp_check_status(usblp, 0);
1153#endif
1154
1155 usb_set_intfdata(intf, usblp);
1156
1157 usblp->present = 1;
1158
1159 retval = usb_register_dev(intf, &usblp_class);
1160 if (retval) {
1161 printk(KERN_ERR "usblp: Not able to get a minor"
1162 " (base %u, slice default): %d\n",
1163 USBLP_MINOR_BASE, retval);
1164 goto abort_intfdata;
1165 }
1166 usblp->minor = intf->minor;
1167 printk(KERN_INFO "usblp%d: USB %sdirectional printer dev %d "
1168 "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X\n",
1169 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
1170 usblp->ifnum,
1171 usblp->protocol[usblp->current_protocol].alt_setting,
1172 usblp->current_protocol,
1173 le16_to_cpu(usblp->dev->descriptor.idVendor),
1174 le16_to_cpu(usblp->dev->descriptor.idProduct));
1175
1176 return 0;
1177
1178abort_intfdata:
1179 usb_set_intfdata(intf, NULL);
1180 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1181abort:
1182 kfree(usblp->readbuf);
1183 kfree(usblp->statusbuf);
1184 kfree(usblp->device_id_string);
1185 kfree(usblp);
1186abort_ret:
1187 return retval;
1188}
1189
1190/*
1191 * We are a "new" style driver with usb_device_id table,
1192 * but our requirements are too intricate for simple match to handle.
1193 *
1194 * The "proto_bias" option may be used to specify the preferred protocol
1195 * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3). If the device
1196 * supports the preferred protocol, then we bind to it.
1197 *
1198 * The best interface for us is 7/1/2, because it is compatible
1199 * with a stream of characters. If we find it, we bind to it.
1200 *
1201 * Note that the people from hpoj.sourceforge.net need to be able to
1202 * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
1203 *
1204 * Failing 7/1/2, we look for 7/1/3, even though it's probably not
1205 * stream-compatible, because this matches the behaviour of the old code.
1206 *
1207 * If nothing else, we bind to 7/1/1 - the unidirectional interface.
1208 */
1209static int usblp_select_alts(struct usblp *usblp)
1210{
1211 struct usb_interface *if_alt;
1212 struct usb_host_interface *ifd;
1213 struct usb_endpoint_descriptor *epd, *epwrite, *epread;
1214 int p, i, e;
1215
1216 if_alt = usblp->intf;
1217
1218 for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1219 usblp->protocol[p].alt_setting = -1;
1220
1221 /* Find out what we have. */
1222 for (i = 0; i < if_alt->num_altsetting; i++) {
1223 ifd = &if_alt->altsetting[i];
1224
1225 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
1226 if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS))
1227 continue;
1228
1229 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1230 ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1231 continue;
1232
1233 /* Look for bulk OUT and IN endpoints. */
1234 epwrite = epread = NULL;
1235 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1236 epd = &ifd->endpoint[e].desc;
1237
1238 if (usb_endpoint_is_bulk_out(epd))
1239 if (!epwrite)
1240 epwrite = epd;
1241
1242 if (usb_endpoint_is_bulk_in(epd))
1243 if (!epread)
1244 epread = epd;
1245 }
1246
1247 /* Ignore buggy hardware without the right endpoints. */
1248 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1249 continue;
1250
1251 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1252 * and buggy bidirectional printers. */
1253 if (ifd->desc.bInterfaceProtocol == 1) {
1254 epread = NULL;
1255 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1256 printk(KERN_INFO "usblp%d: Disabling reads from "
1257 "problematic bidirectional printer\n",
1258 usblp->minor);
1259 epread = NULL;
1260 }
1261
1262 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1263 ifd->desc.bAlternateSetting;
1264 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1265 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1266 }
1267
1268 /* If our requested protocol is supported, then use it. */
1269 if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1270 proto_bias <= USBLP_LAST_PROTOCOL &&
1271 usblp->protocol[proto_bias].alt_setting != -1)
1272 return proto_bias;
1273
1274 /* Ordering is important here. */
1275 if (usblp->protocol[2].alt_setting != -1)
1276 return 2;
1277 if (usblp->protocol[1].alt_setting != -1)
1278 return 1;
1279 if (usblp->protocol[3].alt_setting != -1)
1280 return 3;
1281
1282 /* If nothing is available, then don't bind to this device. */
1283 return -1;
1284}
1285
1286static int usblp_set_protocol(struct usblp *usblp, int protocol)
1287{
1288 int r, alts;
1289
1290 if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1291 return -EINVAL;
1292
1293 alts = usblp->protocol[protocol].alt_setting;
1294 if (alts < 0)
1295 return -EINVAL;
1296 r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1297 if (r < 0) {
1298 printk(KERN_ERR "usblp: can't set desired altsetting %d on interface %d\n",
1299 alts, usblp->ifnum);
1300 return r;
1301 }
1302
1303 usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1304 usblp->current_protocol = protocol;
1305 dbg("usblp%d set protocol %d", usblp->minor, protocol);
1306 return 0;
1307}
1308
1309/* Retrieves and caches device ID string.
1310 * Returns length, including length bytes but not null terminator.
1311 * On error, returns a negative errno value. */
1312static int usblp_cache_device_id_string(struct usblp *usblp)
1313{
1314 int err, length;
1315
1316 err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1317 if (err < 0) {
1318 dbg("usblp%d: error = %d reading IEEE-1284 Device ID string",
1319 usblp->minor, err);
1320 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1321 return -EIO;
1322 }
1323
1324 /* First two bytes are length in big-endian.
1325 * They count themselves, and we copy them into
1326 * the user's buffer. */
1327 length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1328 if (length < 2)
1329 length = 2;
1330 else if (length >= USBLP_DEVICE_ID_SIZE)
1331 length = USBLP_DEVICE_ID_SIZE - 1;
1332 usblp->device_id_string[length] = '\0';
1333
1334 dbg("usblp%d Device ID string [len=%d]=\"%s\"",
1335 usblp->minor, length, &usblp->device_id_string[2]);
1336
1337 return length;
1338}
1339
1340static void usblp_disconnect(struct usb_interface *intf)
1341{
1342 struct usblp *usblp = usb_get_intfdata(intf);
1343
1344 usb_deregister_dev(intf, &usblp_class);
1345
1346 if (!usblp || !usblp->dev) {
1347 dev_err(&intf->dev, "bogus disconnect\n");
1348 BUG();
1349 }
1350
1351 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1352
1353 mutex_lock(&usblp_mutex);
1354 mutex_lock(&usblp->mut);
1355 usblp->present = 0;
1356 wake_up(&usblp->wwait);
1357 wake_up(&usblp->rwait);
1358 usb_set_intfdata(intf, NULL);
1359
1360 usblp_unlink_urbs(usblp);
1361 mutex_unlock(&usblp->mut);
1362
1363 if (!usblp->used)
1364 usblp_cleanup(usblp);
1365 mutex_unlock(&usblp_mutex);
1366}
1367
1368static int usblp_suspend(struct usb_interface *intf, pm_message_t message)
1369{
1370 struct usblp *usblp = usb_get_intfdata(intf);
1371
1372 usblp_unlink_urbs(usblp);
1373#if 0 /* XXX Do we want this? What if someone is reading, should we fail? */
1374 /* not strictly necessary, but just in case */
1375 wake_up(&usblp->wwait);
1376 wake_up(&usblp->rwait);
1377#endif
1378
1379 return 0;
1380}
1381
1382static int usblp_resume(struct usb_interface *intf)
1383{
1384 struct usblp *usblp = usb_get_intfdata(intf);
1385 int r;
1386
1387 r = handle_bidir(usblp);
1388
1389 return r;
1390}
1391
1392static const struct usb_device_id usblp_ids[] = {
1393 { USB_DEVICE_INFO(7, 1, 1) },
1394 { USB_DEVICE_INFO(7, 1, 2) },
1395 { USB_DEVICE_INFO(7, 1, 3) },
1396 { USB_INTERFACE_INFO(7, 1, 1) },
1397 { USB_INTERFACE_INFO(7, 1, 2) },
1398 { USB_INTERFACE_INFO(7, 1, 3) },
1399 { USB_DEVICE(0x04b8, 0x0202) }, /* Seiko Epson Receipt Printer M129C */
1400 { } /* Terminating entry */
1401};
1402
1403MODULE_DEVICE_TABLE(usb, usblp_ids);
1404
1405static struct usb_driver usblp_driver = {
1406 .name = "usblp",
1407 .probe = usblp_probe,
1408 .disconnect = usblp_disconnect,
1409 .suspend = usblp_suspend,
1410 .resume = usblp_resume,
1411 .id_table = usblp_ids,
1412 .supports_autosuspend = 1,
1413};
1414
1415static int __init usblp_init(void)
1416{
1417 return usb_register(&usblp_driver);
1418}
1419
1420static void __exit usblp_exit(void)
1421{
1422 usb_deregister(&usblp_driver);
1423}
1424
1425module_init(usblp_init);
1426module_exit(usblp_exit);
1427
1428MODULE_AUTHOR(DRIVER_AUTHOR);
1429MODULE_DESCRIPTION(DRIVER_DESC);
1430module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1431MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1432MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * usblp.c
4 *
5 * Copyright (c) 1999 Michael Gee <michael@linuxspecific.com>
6 * Copyright (c) 1999 Pavel Machek <pavel@ucw.cz>
7 * Copyright (c) 2000 Randy Dunlap <rdunlap@xenotime.net>
8 * Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz>
9 # Copyright (c) 2001 Pete Zaitcev <zaitcev@redhat.com>
10 # Copyright (c) 2001 David Paschal <paschal@rcsis.com>
11 * Copyright (c) 2006 Oliver Neukum <oliver@neukum.name>
12 *
13 * USB Printer Device Class driver for USB printers and printer cables
14 *
15 * Sponsored by SuSE
16 *
17 * ChangeLog:
18 * v0.1 - thorough cleaning, URBification, almost a rewrite
19 * v0.2 - some more cleanups
20 * v0.3 - cleaner again, waitqueue fixes
21 * v0.4 - fixes in unidirectional mode
22 * v0.5 - add DEVICE_ID string support
23 * v0.6 - never time out
24 * v0.7 - fixed bulk-IN read and poll (David Paschal)
25 * v0.8 - add devfs support
26 * v0.9 - fix unplug-while-open paths
27 * v0.10- remove sleep_on, fix error on oom (oliver@neukum.org)
28 * v0.11 - add proto_bias option (Pete Zaitcev)
29 * v0.12 - add hpoj.sourceforge.net ioctls (David Paschal)
30 * v0.13 - alloc space for statusbuf (<status> not on stack);
31 * use usb_alloc_coherent() for read buf & write buf;
32 * none - Maintained in Linux kernel after v0.13
33 */
34
35#include <linux/module.h>
36#include <linux/kernel.h>
37#include <linux/sched/signal.h>
38#include <linux/signal.h>
39#include <linux/poll.h>
40#include <linux/slab.h>
41#include <linux/lp.h>
42#include <linux/mutex.h>
43#undef DEBUG
44#include <linux/usb.h>
45#include <linux/usb/ch9.h>
46#include <linux/ratelimit.h>
47
48/*
49 * Version Information
50 */
51#define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal"
52#define DRIVER_DESC "USB Printer Device Class driver"
53
54#define USBLP_BUF_SIZE 8192
55#define USBLP_BUF_SIZE_IN 1024
56#define USBLP_DEVICE_ID_SIZE 1024
57
58/* ioctls: */
59#define IOCNR_GET_DEVICE_ID 1
60#define IOCNR_GET_PROTOCOLS 2
61#define IOCNR_SET_PROTOCOL 3
62#define IOCNR_HP_SET_CHANNEL 4
63#define IOCNR_GET_BUS_ADDRESS 5
64#define IOCNR_GET_VID_PID 6
65#define IOCNR_SOFT_RESET 7
66/* Get device_id string: */
67#define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len)
68/* The following ioctls were added for http://hpoj.sourceforge.net:
69 * Get two-int array:
70 * [0]=current protocol
71 * (1=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2,
72 * 3=USB_CLASS_PRINTER/1/3),
73 * [1]=supported protocol mask (mask&(1<<n)!=0 means
74 * USB_CLASS_PRINTER/1/n supported):
75 */
76#define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
77/*
78 * Set protocol
79 * (arg: 1=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2,
80 * 3=USB_CLASS_PRINTER/1/3):
81 */
82#define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0)
83/* Set channel number (HP Vendor-specific command): */
84#define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0)
85/* Get two-int array: [0]=bus number, [1]=device address: */
86#define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len)
87/* Get two-int array: [0]=vendor ID, [1]=product ID: */
88#define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len)
89/* Perform class specific soft reset */
90#define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0);
91
92/*
93 * A DEVICE_ID string may include the printer's serial number.
94 * It should end with a semi-colon (';').
95 * An example from an HP 970C DeskJet printer is (this is one long string,
96 * with the serial number changed):
97MFG: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: ;
98 */
99
100/*
101 * USB Printer Requests
102 */
103
104#define USBLP_REQ_GET_ID 0x00
105#define USBLP_REQ_GET_STATUS 0x01
106#define USBLP_REQ_RESET 0x02
107#define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST 0x00 /* HP Vendor-specific */
108
109#define USBLP_MINORS 16
110#define USBLP_MINOR_BASE 0
111
112#define USBLP_CTL_TIMEOUT 5000 /* 5 seconds */
113
114#define USBLP_FIRST_PROTOCOL 1
115#define USBLP_LAST_PROTOCOL 3
116#define USBLP_MAX_PROTOCOLS (USBLP_LAST_PROTOCOL+1)
117
118/*
119 * some arbitrary status buffer size;
120 * need a status buffer that is allocated via kmalloc(), not on stack
121 */
122#define STATUS_BUF_SIZE 8
123
124/*
125 * Locks down the locking order:
126 * ->wmut locks wstatus.
127 * ->mut locks the whole usblp, except [rw]complete, and thus, by indirection,
128 * [rw]status. We only touch status when we know the side idle.
129 * ->lock locks what interrupt accesses.
130 */
131struct usblp {
132 struct usb_device *dev; /* USB device */
133 struct mutex wmut;
134 struct mutex mut;
135 spinlock_t lock; /* locks rcomplete, wcomplete */
136 char *readbuf; /* read transfer_buffer */
137 char *statusbuf; /* status transfer_buffer */
138 struct usb_anchor urbs;
139 wait_queue_head_t rwait, wwait;
140 int readcount; /* Counter for reads */
141 int ifnum; /* Interface number */
142 struct usb_interface *intf; /* The interface */
143 /*
144 * Alternate-setting numbers and endpoints for each protocol
145 * (USB_CLASS_PRINTER/1/{index=1,2,3}) that the device supports:
146 */
147 struct {
148 int alt_setting;
149 struct usb_endpoint_descriptor *epwrite;
150 struct usb_endpoint_descriptor *epread;
151 } protocol[USBLP_MAX_PROTOCOLS];
152 int current_protocol;
153 int minor; /* minor number of device */
154 int wcomplete, rcomplete;
155 int wstatus; /* bytes written or error */
156 int rstatus; /* bytes ready or error */
157 unsigned int quirks; /* quirks flags */
158 unsigned int flags; /* mode flags */
159 unsigned char used; /* True if open */
160 unsigned char present; /* True if not disconnected */
161 unsigned char bidir; /* interface is bidirectional */
162 unsigned char no_paper; /* Paper Out happened */
163 unsigned char *device_id_string; /* IEEE 1284 DEVICE ID string (ptr) */
164 /* first 2 bytes are (big-endian) length */
165};
166
167#ifdef DEBUG
168static void usblp_dump(struct usblp *usblp)
169{
170 struct device *dev = &usblp->intf->dev;
171 int p;
172
173 dev_dbg(dev, "usblp=0x%p\n", usblp);
174 dev_dbg(dev, "dev=0x%p\n", usblp->dev);
175 dev_dbg(dev, "present=%d\n", usblp->present);
176 dev_dbg(dev, "readbuf=0x%p\n", usblp->readbuf);
177 dev_dbg(dev, "readcount=%d\n", usblp->readcount);
178 dev_dbg(dev, "ifnum=%d\n", usblp->ifnum);
179 for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
180 dev_dbg(dev, "protocol[%d].alt_setting=%d\n", p,
181 usblp->protocol[p].alt_setting);
182 dev_dbg(dev, "protocol[%d].epwrite=%p\n", p,
183 usblp->protocol[p].epwrite);
184 dev_dbg(dev, "protocol[%d].epread=%p\n", p,
185 usblp->protocol[p].epread);
186 }
187 dev_dbg(dev, "current_protocol=%d\n", usblp->current_protocol);
188 dev_dbg(dev, "minor=%d\n", usblp->minor);
189 dev_dbg(dev, "wstatus=%d\n", usblp->wstatus);
190 dev_dbg(dev, "rstatus=%d\n", usblp->rstatus);
191 dev_dbg(dev, "quirks=%d\n", usblp->quirks);
192 dev_dbg(dev, "used=%d\n", usblp->used);
193 dev_dbg(dev, "bidir=%d\n", usblp->bidir);
194 dev_dbg(dev, "device_id_string=\"%s\"\n",
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
203struct 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
213static 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
233static int usblp_wwait(struct usblp *usblp, int nonblock);
234static int usblp_wtest(struct usblp *usblp, int nonblock);
235static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock);
236static int usblp_rtest(struct usblp *usblp, int nonblock);
237static int usblp_submit_read(struct usblp *usblp);
238static int usblp_select_alts(struct usblp *usblp);
239static int usblp_set_protocol(struct usblp *usblp, int protocol);
240static int usblp_cache_device_id_string(struct usblp *usblp);
241
242/* forward reference to make our lives easier */
243static struct usb_driver usblp_driver;
244static DEFINE_MUTEX(usblp_mutex); /* locks the existence of usblp's */
245
246/*
247 * Functions for usblp control messages.
248 */
249
250static 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 dev_dbg(&usblp->intf->dev,
265 "usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d\n",
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 /sys/kernel/debug/usb/devices and dmesg in
283 * case of any trouble.
284 */
285static int proto_bias = -1;
286
287/*
288 * URB callback.
289 */
290
291static void usblp_bulk_read(struct urb *urb)
292{
293 struct usblp *usblp = urb->context;
294 int status = urb->status;
295 unsigned long flags;
296
297 if (usblp->present && usblp->used) {
298 if (status)
299 printk(KERN_WARNING "usblp%d: "
300 "nonzero read bulk status received: %d\n",
301 usblp->minor, status);
302 }
303 spin_lock_irqsave(&usblp->lock, flags);
304 if (status < 0)
305 usblp->rstatus = status;
306 else
307 usblp->rstatus = urb->actual_length;
308 usblp->rcomplete = 1;
309 wake_up(&usblp->rwait);
310 spin_unlock_irqrestore(&usblp->lock, flags);
311
312 usb_free_urb(urb);
313}
314
315static void usblp_bulk_write(struct urb *urb)
316{
317 struct usblp *usblp = urb->context;
318 int status = urb->status;
319 unsigned long flags;
320
321 if (usblp->present && usblp->used) {
322 if (status)
323 printk(KERN_WARNING "usblp%d: "
324 "nonzero write bulk status received: %d\n",
325 usblp->minor, status);
326 }
327 spin_lock_irqsave(&usblp->lock, flags);
328 if (status < 0)
329 usblp->wstatus = status;
330 else
331 usblp->wstatus = urb->actual_length;
332 usblp->no_paper = 0;
333 usblp->wcomplete = 1;
334 wake_up(&usblp->wwait);
335 spin_unlock_irqrestore(&usblp->lock, flags);
336
337 usb_free_urb(urb);
338}
339
340/*
341 * Get and print printer errors.
342 */
343
344static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
345
346static int usblp_check_status(struct usblp *usblp, int err)
347{
348 unsigned char status, newerr = 0;
349 int error;
350
351 mutex_lock(&usblp->mut);
352 if ((error = usblp_read_status(usblp, usblp->statusbuf)) < 0) {
353 mutex_unlock(&usblp->mut);
354 printk_ratelimited(KERN_ERR
355 "usblp%d: error %d reading printer status\n",
356 usblp->minor, error);
357 return 0;
358 }
359 status = *usblp->statusbuf;
360 mutex_unlock(&usblp->mut);
361
362 if (~status & LP_PERRORP)
363 newerr = 3;
364 if (status & LP_POUTPA)
365 newerr = 1;
366 if (~status & LP_PSELECD)
367 newerr = 2;
368
369 if (newerr != err) {
370 printk(KERN_INFO "usblp%d: %s\n",
371 usblp->minor, usblp_messages[newerr]);
372 }
373
374 return newerr;
375}
376
377static int handle_bidir(struct usblp *usblp)
378{
379 if (usblp->bidir && usblp->used) {
380 if (usblp_submit_read(usblp) < 0)
381 return -EIO;
382 }
383 return 0;
384}
385
386/*
387 * File op functions.
388 */
389
390static int usblp_open(struct inode *inode, struct file *file)
391{
392 int minor = iminor(inode);
393 struct usblp *usblp;
394 struct usb_interface *intf;
395 int retval;
396
397 if (minor < 0)
398 return -ENODEV;
399
400 mutex_lock(&usblp_mutex);
401
402 retval = -ENODEV;
403 intf = usb_find_interface(&usblp_driver, minor);
404 if (!intf)
405 goto out;
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 usb_autopm_put_interface(intf);
432 usblp->used = 0;
433 file->private_data = NULL;
434 retval = -EIO;
435 }
436out:
437 mutex_unlock(&usblp_mutex);
438 return retval;
439}
440
441static void usblp_cleanup(struct usblp *usblp)
442{
443 printk(KERN_INFO "usblp%d: removed\n", usblp->minor);
444
445 kfree(usblp->readbuf);
446 kfree(usblp->device_id_string);
447 kfree(usblp->statusbuf);
448 usb_put_intf(usblp->intf);
449 kfree(usblp);
450}
451
452static void usblp_unlink_urbs(struct usblp *usblp)
453{
454 usb_kill_anchored_urbs(&usblp->urbs);
455}
456
457static int usblp_release(struct inode *inode, struct file *file)
458{
459 struct usblp *usblp = file->private_data;
460
461 usblp->flags &= ~LP_ABORT;
462
463 mutex_lock(&usblp_mutex);
464 usblp->used = 0;
465 if (usblp->present)
466 usblp_unlink_urbs(usblp);
467
468 usb_autopm_put_interface(usblp->intf);
469
470 if (!usblp->present) /* finish cleanup from disconnect */
471 usblp_cleanup(usblp);
472 mutex_unlock(&usblp_mutex);
473 return 0;
474}
475
476/* No kernel lock - fine */
477static __poll_t usblp_poll(struct file *file, struct poll_table_struct *wait)
478{
479 __poll_t 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) ? EPOLLIN | EPOLLRDNORM : 0) |
488 ((usblp->no_paper || usblp->wcomplete) ? EPOLLOUT | EPOLLWRNORM : 0);
489 spin_unlock_irqrestore(&usblp->lock, flags);
490 return ret;
491}
492
493static 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 dev_dbg(&usblp->intf->dev,
509 "usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)\n", cmd,
510 _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd));
511
512 if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */
513
514 switch (_IOC_NR(cmd)) {
515
516 case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
517 if (_IOC_DIR(cmd) != _IOC_READ) {
518 retval = -EINVAL;
519 goto done;
520 }
521
522 length = usblp_cache_device_id_string(usblp);
523 if (length < 0) {
524 retval = length;
525 goto done;
526 }
527 if (length > _IOC_SIZE(cmd))
528 length = _IOC_SIZE(cmd); /* truncate */
529
530 if (copy_to_user((void __user *) arg,
531 usblp->device_id_string,
532 (unsigned long) length)) {
533 retval = -EFAULT;
534 goto done;
535 }
536
537 break;
538
539 case IOCNR_GET_PROTOCOLS:
540 if (_IOC_DIR(cmd) != _IOC_READ ||
541 _IOC_SIZE(cmd) < sizeof(twoints)) {
542 retval = -EINVAL;
543 goto done;
544 }
545
546 twoints[0] = usblp->current_protocol;
547 twoints[1] = 0;
548 for (i = USBLP_FIRST_PROTOCOL;
549 i <= USBLP_LAST_PROTOCOL; i++) {
550 if (usblp->protocol[i].alt_setting >= 0)
551 twoints[1] |= (1<<i);
552 }
553
554 if (copy_to_user((void __user *)arg,
555 (unsigned char *)twoints,
556 sizeof(twoints))) {
557 retval = -EFAULT;
558 goto done;
559 }
560
561 break;
562
563 case IOCNR_SET_PROTOCOL:
564 if (_IOC_DIR(cmd) != _IOC_WRITE) {
565 retval = -EINVAL;
566 goto done;
567 }
568
569#ifdef DEBUG
570 if (arg == -10) {
571 usblp_dump(usblp);
572 break;
573 }
574#endif
575
576 usblp_unlink_urbs(usblp);
577 retval = usblp_set_protocol(usblp, arg);
578 if (retval < 0) {
579 usblp_set_protocol(usblp,
580 usblp->current_protocol);
581 }
582 break;
583
584 case IOCNR_HP_SET_CHANNEL:
585 if (_IOC_DIR(cmd) != _IOC_WRITE ||
586 le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
587 usblp->quirks & USBLP_QUIRK_BIDIR) {
588 retval = -EINVAL;
589 goto done;
590 }
591
592 err = usblp_hp_channel_change_request(usblp,
593 arg, &newChannel);
594 if (err < 0) {
595 dev_err(&usblp->dev->dev,
596 "usblp%d: error = %d setting "
597 "HP channel\n",
598 usblp->minor, err);
599 retval = -EIO;
600 goto done;
601 }
602
603 dev_dbg(&usblp->intf->dev,
604 "usblp%d requested/got HP channel %ld/%d\n",
605 usblp->minor, arg, newChannel);
606 break;
607
608 case IOCNR_GET_BUS_ADDRESS:
609 if (_IOC_DIR(cmd) != _IOC_READ ||
610 _IOC_SIZE(cmd) < sizeof(twoints)) {
611 retval = -EINVAL;
612 goto done;
613 }
614
615 twoints[0] = usblp->dev->bus->busnum;
616 twoints[1] = usblp->dev->devnum;
617 if (copy_to_user((void __user *)arg,
618 (unsigned char *)twoints,
619 sizeof(twoints))) {
620 retval = -EFAULT;
621 goto done;
622 }
623
624 dev_dbg(&usblp->intf->dev,
625 "usblp%d is bus=%d, device=%d\n",
626 usblp->minor, twoints[0], twoints[1]);
627 break;
628
629 case IOCNR_GET_VID_PID:
630 if (_IOC_DIR(cmd) != _IOC_READ ||
631 _IOC_SIZE(cmd) < sizeof(twoints)) {
632 retval = -EINVAL;
633 goto done;
634 }
635
636 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
637 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
638 if (copy_to_user((void __user *)arg,
639 (unsigned char *)twoints,
640 sizeof(twoints))) {
641 retval = -EFAULT;
642 goto done;
643 }
644
645 dev_dbg(&usblp->intf->dev,
646 "usblp%d is VID=0x%4.4X, PID=0x%4.4X\n",
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 retval = usblp_read_status(usblp, usblp->statusbuf);
665 if (retval) {
666 printk_ratelimited(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
688done:
689 mutex_unlock(&usblp->mut);
690 return retval;
691}
692
693static struct urb *usblp_new_writeurb(struct usblp *usblp, int transfer_length)
694{
695 struct urb *urb;
696 char *writebuf;
697
698 writebuf = kmalloc(transfer_length, GFP_KERNEL);
699 if (writebuf == NULL)
700 return NULL;
701 urb = usb_alloc_urb(0, GFP_KERNEL);
702 if (urb == NULL) {
703 kfree(writebuf);
704 return NULL;
705 }
706
707 usb_fill_bulk_urb(urb, usblp->dev,
708 usb_sndbulkpipe(usblp->dev,
709 usblp->protocol[usblp->current_protocol].epwrite->bEndpointAddress),
710 writebuf, transfer_length, usblp_bulk_write, usblp);
711 urb->transfer_flags |= URB_FREE_BUFFER;
712
713 return urb;
714}
715
716static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
717{
718 struct usblp *usblp = file->private_data;
719 struct urb *writeurb;
720 int rv;
721 int transfer_length;
722 ssize_t writecount = 0;
723
724 if (mutex_lock_interruptible(&usblp->wmut)) {
725 rv = -EINTR;
726 goto raise_biglock;
727 }
728 if ((rv = usblp_wwait(usblp, !!(file->f_flags & O_NONBLOCK))) < 0)
729 goto raise_wait;
730
731 while (writecount < count) {
732 /*
733 * Step 1: Submit next block.
734 */
735 if ((transfer_length = count - writecount) > USBLP_BUF_SIZE)
736 transfer_length = USBLP_BUF_SIZE;
737
738 rv = -ENOMEM;
739 writeurb = usblp_new_writeurb(usblp, transfer_length);
740 if (writeurb == NULL)
741 goto raise_urb;
742 usb_anchor_urb(writeurb, &usblp->urbs);
743
744 if (copy_from_user(writeurb->transfer_buffer,
745 buffer + writecount, transfer_length)) {
746 rv = -EFAULT;
747 goto raise_badaddr;
748 }
749
750 spin_lock_irq(&usblp->lock);
751 usblp->wcomplete = 0;
752 spin_unlock_irq(&usblp->lock);
753 if ((rv = usb_submit_urb(writeurb, GFP_KERNEL)) < 0) {
754 usblp->wstatus = 0;
755 spin_lock_irq(&usblp->lock);
756 usblp->no_paper = 0;
757 usblp->wcomplete = 1;
758 wake_up(&usblp->wwait);
759 spin_unlock_irq(&usblp->lock);
760 if (rv != -ENOMEM)
761 rv = -EIO;
762 goto raise_submit;
763 }
764
765 /*
766 * Step 2: Wait for transfer to end, collect results.
767 */
768 rv = usblp_wwait(usblp, !!(file->f_flags&O_NONBLOCK));
769 if (rv < 0) {
770 if (rv == -EAGAIN) {
771 /* Presume that it's going to complete well. */
772 writecount += transfer_length;
773 }
774 if (rv == -ENOSPC) {
775 spin_lock_irq(&usblp->lock);
776 usblp->no_paper = 1; /* Mark for poll(2) */
777 spin_unlock_irq(&usblp->lock);
778 writecount += transfer_length;
779 }
780 /* Leave URB dangling, to be cleaned on close. */
781 goto collect_error;
782 }
783
784 if (usblp->wstatus < 0) {
785 rv = -EIO;
786 goto collect_error;
787 }
788 /*
789 * This is critical: it must be our URB, not other writer's.
790 * The wmut exists mainly to cover us here.
791 */
792 writecount += usblp->wstatus;
793 }
794
795 mutex_unlock(&usblp->wmut);
796 return writecount;
797
798raise_submit:
799raise_badaddr:
800 usb_unanchor_urb(writeurb);
801 usb_free_urb(writeurb);
802raise_urb:
803raise_wait:
804collect_error: /* Out of raise sequence */
805 mutex_unlock(&usblp->wmut);
806raise_biglock:
807 return writecount ? writecount : rv;
808}
809
810/*
811 * Notice that we fail to restart in a few cases: on EFAULT, on restart
812 * error, etc. This is the historical behaviour. In all such cases we return
813 * EIO, and applications loop in order to get the new read going.
814 */
815static ssize_t usblp_read(struct file *file, char __user *buffer, size_t len, loff_t *ppos)
816{
817 struct usblp *usblp = file->private_data;
818 ssize_t count;
819 ssize_t avail;
820 int rv;
821
822 if (!usblp->bidir)
823 return -EINVAL;
824
825 rv = usblp_rwait_and_lock(usblp, !!(file->f_flags & O_NONBLOCK));
826 if (rv < 0)
827 return rv;
828
829 if ((avail = usblp->rstatus) < 0) {
830 printk(KERN_ERR "usblp%d: error %d reading from printer\n",
831 usblp->minor, (int)avail);
832 usblp_submit_read(usblp);
833 count = -EIO;
834 goto done;
835 }
836
837 count = len < avail - usblp->readcount ? len : avail - usblp->readcount;
838 if (count != 0 &&
839 copy_to_user(buffer, usblp->readbuf + usblp->readcount, count)) {
840 count = -EFAULT;
841 goto done;
842 }
843
844 if ((usblp->readcount += count) == avail) {
845 if (usblp_submit_read(usblp) < 0) {
846 /* We don't want to leak USB return codes into errno. */
847 if (count == 0)
848 count = -EIO;
849 goto done;
850 }
851 }
852
853done:
854 mutex_unlock(&usblp->mut);
855 return count;
856}
857
858/*
859 * Wait for the write path to come idle.
860 * This is called under the ->wmut, so the idle path stays idle.
861 *
862 * Our write path has a peculiar property: it does not buffer like a tty,
863 * but waits for the write to succeed. This allows our ->release to bug out
864 * without waiting for writes to drain. But it obviously does not work
865 * when O_NONBLOCK is set. So, applications setting O_NONBLOCK must use
866 * select(2) or poll(2) to wait for the buffer to drain before closing.
867 * Alternatively, set blocking mode with fcntl and issue a zero-size write.
868 */
869static int usblp_wwait(struct usblp *usblp, int nonblock)
870{
871 DECLARE_WAITQUEUE(waita, current);
872 int rc;
873 int err = 0;
874
875 add_wait_queue(&usblp->wwait, &waita);
876 for (;;) {
877 if (mutex_lock_interruptible(&usblp->mut)) {
878 rc = -EINTR;
879 break;
880 }
881 set_current_state(TASK_INTERRUPTIBLE);
882 rc = usblp_wtest(usblp, nonblock);
883 mutex_unlock(&usblp->mut);
884 if (rc <= 0)
885 break;
886
887 if (schedule_timeout(msecs_to_jiffies(1500)) == 0) {
888 if (usblp->flags & LP_ABORT) {
889 err = usblp_check_status(usblp, err);
890 if (err == 1) { /* Paper out */
891 rc = -ENOSPC;
892 break;
893 }
894 } else {
895 /* Prod the printer, Gentoo#251237. */
896 mutex_lock(&usblp->mut);
897 usblp_read_status(usblp, usblp->statusbuf);
898 mutex_unlock(&usblp->mut);
899 }
900 }
901 }
902 set_current_state(TASK_RUNNING);
903 remove_wait_queue(&usblp->wwait, &waita);
904 return rc;
905}
906
907static int usblp_wtest(struct usblp *usblp, int nonblock)
908{
909 unsigned long flags;
910
911 if (!usblp->present)
912 return -ENODEV;
913 if (signal_pending(current))
914 return -EINTR;
915 spin_lock_irqsave(&usblp->lock, flags);
916 if (usblp->wcomplete) {
917 spin_unlock_irqrestore(&usblp->lock, flags);
918 return 0;
919 }
920 spin_unlock_irqrestore(&usblp->lock, flags);
921 if (nonblock)
922 return -EAGAIN;
923 return 1;
924}
925
926/*
927 * Wait for read bytes to become available. This probably should have been
928 * called usblp_r_lock_and_wait(), because we lock first. But it's a traditional
929 * name for functions which lock and return.
930 *
931 * We do not use wait_event_interruptible because it makes locking iffy.
932 */
933static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock)
934{
935 DECLARE_WAITQUEUE(waita, current);
936 int rc;
937
938 add_wait_queue(&usblp->rwait, &waita);
939 for (;;) {
940 if (mutex_lock_interruptible(&usblp->mut)) {
941 rc = -EINTR;
942 break;
943 }
944 set_current_state(TASK_INTERRUPTIBLE);
945 if ((rc = usblp_rtest(usblp, nonblock)) < 0) {
946 mutex_unlock(&usblp->mut);
947 break;
948 }
949 if (rc == 0) /* Keep it locked */
950 break;
951 mutex_unlock(&usblp->mut);
952 schedule();
953 }
954 set_current_state(TASK_RUNNING);
955 remove_wait_queue(&usblp->rwait, &waita);
956 return rc;
957}
958
959static int usblp_rtest(struct usblp *usblp, int nonblock)
960{
961 unsigned long flags;
962
963 if (!usblp->present)
964 return -ENODEV;
965 if (signal_pending(current))
966 return -EINTR;
967 spin_lock_irqsave(&usblp->lock, flags);
968 if (usblp->rcomplete) {
969 spin_unlock_irqrestore(&usblp->lock, flags);
970 return 0;
971 }
972 spin_unlock_irqrestore(&usblp->lock, flags);
973 if (nonblock)
974 return -EAGAIN;
975 return 1;
976}
977
978/*
979 * Please check ->bidir and other such things outside for now.
980 */
981static int usblp_submit_read(struct usblp *usblp)
982{
983 struct urb *urb;
984 unsigned long flags;
985 int rc;
986
987 rc = -ENOMEM;
988 urb = usb_alloc_urb(0, GFP_KERNEL);
989 if (urb == NULL)
990 goto raise_urb;
991
992 usb_fill_bulk_urb(urb, usblp->dev,
993 usb_rcvbulkpipe(usblp->dev,
994 usblp->protocol[usblp->current_protocol].epread->bEndpointAddress),
995 usblp->readbuf, USBLP_BUF_SIZE_IN,
996 usblp_bulk_read, usblp);
997 usb_anchor_urb(urb, &usblp->urbs);
998
999 spin_lock_irqsave(&usblp->lock, flags);
1000 usblp->readcount = 0; /* XXX Why here? */
1001 usblp->rcomplete = 0;
1002 spin_unlock_irqrestore(&usblp->lock, flags);
1003 if ((rc = usb_submit_urb(urb, GFP_KERNEL)) < 0) {
1004 dev_dbg(&usblp->intf->dev, "error submitting urb (%d)\n", rc);
1005 spin_lock_irqsave(&usblp->lock, flags);
1006 usblp->rstatus = rc;
1007 usblp->rcomplete = 1;
1008 spin_unlock_irqrestore(&usblp->lock, flags);
1009 goto raise_submit;
1010 }
1011
1012 return 0;
1013
1014raise_submit:
1015 usb_unanchor_urb(urb);
1016 usb_free_urb(urb);
1017raise_urb:
1018 return rc;
1019}
1020
1021/*
1022 * Checks for printers that have quirks, such as requiring unidirectional
1023 * communication but reporting bidirectional; currently some HP printers
1024 * have this flaw (HP 810, 880, 895, etc.), or needing an init string
1025 * sent at each open (like some Epsons).
1026 * Returns 1 if found, 0 if not found.
1027 *
1028 * HP recommended that we use the bidirectional interface but
1029 * don't attempt any bulk IN transfers from the IN endpoint.
1030 * Here's some more detail on the problem:
1031 * The problem is not that it isn't bidirectional though. The problem
1032 * is that if you request a device ID, or status information, while
1033 * the buffers are full, the return data will end up in the print data
1034 * buffer. For example if you make sure you never request the device ID
1035 * while you are sending print data, and you don't try to query the
1036 * printer status every couple of milliseconds, you will probably be OK.
1037 */
1038static unsigned int usblp_quirks(__u16 vendor, __u16 product)
1039{
1040 int i;
1041
1042 for (i = 0; quirk_printers[i].vendorId; i++) {
1043 if (vendor == quirk_printers[i].vendorId &&
1044 product == quirk_printers[i].productId)
1045 return quirk_printers[i].quirks;
1046 }
1047 return 0;
1048}
1049
1050static const struct file_operations usblp_fops = {
1051 .owner = THIS_MODULE,
1052 .read = usblp_read,
1053 .write = usblp_write,
1054 .poll = usblp_poll,
1055 .unlocked_ioctl = usblp_ioctl,
1056 .compat_ioctl = usblp_ioctl,
1057 .open = usblp_open,
1058 .release = usblp_release,
1059 .llseek = noop_llseek,
1060};
1061
1062static char *usblp_devnode(struct device *dev, umode_t *mode)
1063{
1064 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
1065}
1066
1067static struct usb_class_driver usblp_class = {
1068 .name = "lp%d",
1069 .devnode = usblp_devnode,
1070 .fops = &usblp_fops,
1071 .minor_base = USBLP_MINOR_BASE,
1072};
1073
1074static ssize_t ieee1284_id_show(struct device *dev, struct device_attribute *attr, char *buf)
1075{
1076 struct usb_interface *intf = to_usb_interface(dev);
1077 struct usblp *usblp = usb_get_intfdata(intf);
1078
1079 if (usblp->device_id_string[0] == 0 &&
1080 usblp->device_id_string[1] == 0)
1081 return 0;
1082
1083 return sprintf(buf, "%s", usblp->device_id_string+2);
1084}
1085
1086static DEVICE_ATTR_RO(ieee1284_id);
1087
1088static struct attribute *usblp_attrs[] = {
1089 &dev_attr_ieee1284_id.attr,
1090 NULL,
1091};
1092ATTRIBUTE_GROUPS(usblp);
1093
1094static int usblp_probe(struct usb_interface *intf,
1095 const struct usb_device_id *id)
1096{
1097 struct usb_device *dev = interface_to_usbdev(intf);
1098 struct usblp *usblp;
1099 int protocol;
1100 int retval;
1101
1102 /* Malloc and start initializing usblp structure so we can use it
1103 * directly. */
1104 usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL);
1105 if (!usblp) {
1106 retval = -ENOMEM;
1107 goto abort_ret;
1108 }
1109 usblp->dev = dev;
1110 mutex_init(&usblp->wmut);
1111 mutex_init(&usblp->mut);
1112 spin_lock_init(&usblp->lock);
1113 init_waitqueue_head(&usblp->rwait);
1114 init_waitqueue_head(&usblp->wwait);
1115 init_usb_anchor(&usblp->urbs);
1116 usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
1117 usblp->intf = usb_get_intf(intf);
1118
1119 /* Malloc device ID string buffer to the largest expected length,
1120 * since we can re-query it on an ioctl and a dynamic string
1121 * could change in length. */
1122 if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
1123 retval = -ENOMEM;
1124 goto abort;
1125 }
1126
1127 /*
1128 * Allocate read buffer. We somewhat wastefully
1129 * malloc both regardless of bidirectionality, because the
1130 * alternate setting can be changed later via an ioctl.
1131 */
1132 if (!(usblp->readbuf = kmalloc(USBLP_BUF_SIZE_IN, GFP_KERNEL))) {
1133 retval = -ENOMEM;
1134 goto abort;
1135 }
1136
1137 /* Allocate buffer for printer status */
1138 usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
1139 if (!usblp->statusbuf) {
1140 retval = -ENOMEM;
1141 goto abort;
1142 }
1143
1144 /* Lookup quirks for this printer. */
1145 usblp->quirks = usblp_quirks(
1146 le16_to_cpu(dev->descriptor.idVendor),
1147 le16_to_cpu(dev->descriptor.idProduct));
1148
1149 /* Analyze and pick initial alternate settings and endpoints. */
1150 protocol = usblp_select_alts(usblp);
1151 if (protocol < 0) {
1152 dev_dbg(&intf->dev,
1153 "incompatible printer-class device 0x%4.4X/0x%4.4X\n",
1154 le16_to_cpu(dev->descriptor.idVendor),
1155 le16_to_cpu(dev->descriptor.idProduct));
1156 retval = -ENODEV;
1157 goto abort;
1158 }
1159
1160 /* Setup the selected alternate setting and endpoints. */
1161 if (usblp_set_protocol(usblp, protocol) < 0) {
1162 retval = -ENODEV; /* ->probe isn't ->ioctl */
1163 goto abort;
1164 }
1165
1166 /* Retrieve and store the device ID string. */
1167 usblp_cache_device_id_string(usblp);
1168
1169#ifdef DEBUG
1170 usblp_check_status(usblp, 0);
1171#endif
1172
1173 usb_set_intfdata(intf, usblp);
1174
1175 usblp->present = 1;
1176
1177 retval = usb_register_dev(intf, &usblp_class);
1178 if (retval) {
1179 dev_err(&intf->dev,
1180 "usblp: Not able to get a minor (base %u, slice default): %d\n",
1181 USBLP_MINOR_BASE, retval);
1182 goto abort_intfdata;
1183 }
1184 usblp->minor = intf->minor;
1185 dev_info(&intf->dev,
1186 "usblp%d: USB %sdirectional printer dev %d if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X\n",
1187 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
1188 usblp->ifnum,
1189 usblp->protocol[usblp->current_protocol].alt_setting,
1190 usblp->current_protocol,
1191 le16_to_cpu(usblp->dev->descriptor.idVendor),
1192 le16_to_cpu(usblp->dev->descriptor.idProduct));
1193
1194 return 0;
1195
1196abort_intfdata:
1197 usb_set_intfdata(intf, NULL);
1198abort:
1199 kfree(usblp->readbuf);
1200 kfree(usblp->statusbuf);
1201 kfree(usblp->device_id_string);
1202 usb_put_intf(usblp->intf);
1203 kfree(usblp);
1204abort_ret:
1205 return retval;
1206}
1207
1208/*
1209 * We are a "new" style driver with usb_device_id table,
1210 * but our requirements are too intricate for simple match to handle.
1211 *
1212 * The "proto_bias" option may be used to specify the preferred protocol
1213 * for all USB printers (1=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2,
1214 * 3=USB_CLASS_PRINTER/1/3). If the device supports the preferred protocol,
1215 * then we bind to it.
1216 *
1217 * The best interface for us is USB_CLASS_PRINTER/1/2, because it
1218 * is compatible with a stream of characters. If we find it, we bind to it.
1219 *
1220 * Note that the people from hpoj.sourceforge.net need to be able to
1221 * bind to USB_CLASS_PRINTER/1/3 (MLC/1284.4), so we provide them ioctls
1222 * for this purpose.
1223 *
1224 * Failing USB_CLASS_PRINTER/1/2, we look for USB_CLASS_PRINTER/1/3,
1225 * even though it's probably not stream-compatible, because this matches
1226 * the behaviour of the old code.
1227 *
1228 * If nothing else, we bind to USB_CLASS_PRINTER/1/1
1229 * - the unidirectional interface.
1230 */
1231static int usblp_select_alts(struct usblp *usblp)
1232{
1233 struct usb_interface *if_alt;
1234 struct usb_host_interface *ifd;
1235 struct usb_endpoint_descriptor *epwrite, *epread;
1236 int p, i;
1237 int res;
1238
1239 if_alt = usblp->intf;
1240
1241 for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1242 usblp->protocol[p].alt_setting = -1;
1243
1244 /* Find out what we have. */
1245 for (i = 0; i < if_alt->num_altsetting; i++) {
1246 ifd = &if_alt->altsetting[i];
1247
1248 if (ifd->desc.bInterfaceClass != USB_CLASS_PRINTER ||
1249 ifd->desc.bInterfaceSubClass != 1)
1250 if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS))
1251 continue;
1252
1253 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1254 ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1255 continue;
1256
1257 /* Look for the expected bulk endpoints. */
1258 if (ifd->desc.bInterfaceProtocol > 1) {
1259 res = usb_find_common_endpoints(ifd,
1260 &epread, &epwrite, NULL, NULL);
1261 } else {
1262 epread = NULL;
1263 res = usb_find_bulk_out_endpoint(ifd, &epwrite);
1264 }
1265
1266 /* Ignore buggy hardware without the right endpoints. */
1267 if (res)
1268 continue;
1269
1270 /* Turn off reads for buggy bidirectional printers. */
1271 if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1272 printk(KERN_INFO "usblp%d: Disabling reads from "
1273 "problematic bidirectional printer\n",
1274 usblp->minor);
1275 epread = NULL;
1276 }
1277
1278 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1279 ifd->desc.bAlternateSetting;
1280 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1281 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1282 }
1283
1284 /* If our requested protocol is supported, then use it. */
1285 if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1286 proto_bias <= USBLP_LAST_PROTOCOL &&
1287 usblp->protocol[proto_bias].alt_setting != -1)
1288 return proto_bias;
1289
1290 /* Ordering is important here. */
1291 if (usblp->protocol[2].alt_setting != -1)
1292 return 2;
1293 if (usblp->protocol[1].alt_setting != -1)
1294 return 1;
1295 if (usblp->protocol[3].alt_setting != -1)
1296 return 3;
1297
1298 /* If nothing is available, then don't bind to this device. */
1299 return -1;
1300}
1301
1302static int usblp_set_protocol(struct usblp *usblp, int protocol)
1303{
1304 int r, alts;
1305
1306 if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1307 return -EINVAL;
1308
1309 alts = usblp->protocol[protocol].alt_setting;
1310 if (alts < 0)
1311 return -EINVAL;
1312 r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1313 if (r < 0) {
1314 printk(KERN_ERR "usblp: can't set desired altsetting %d on interface %d\n",
1315 alts, usblp->ifnum);
1316 return r;
1317 }
1318
1319 usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1320 usblp->current_protocol = protocol;
1321 dev_dbg(&usblp->intf->dev, "usblp%d set protocol %d\n",
1322 usblp->minor, protocol);
1323 return 0;
1324}
1325
1326/* Retrieves and caches device ID string.
1327 * Returns length, including length bytes but not null terminator.
1328 * On error, returns a negative errno value. */
1329static int usblp_cache_device_id_string(struct usblp *usblp)
1330{
1331 int err, length;
1332
1333 err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1334 if (err < 0) {
1335 dev_dbg(&usblp->intf->dev,
1336 "usblp%d: error = %d reading IEEE-1284 Device ID string\n",
1337 usblp->minor, err);
1338 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1339 return -EIO;
1340 }
1341
1342 /* First two bytes are length in big-endian.
1343 * They count themselves, and we copy them into
1344 * the user's buffer. */
1345 length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1346 if (length < 2)
1347 length = 2;
1348 else if (length >= USBLP_DEVICE_ID_SIZE)
1349 length = USBLP_DEVICE_ID_SIZE - 1;
1350 usblp->device_id_string[length] = '\0';
1351
1352 dev_dbg(&usblp->intf->dev, "usblp%d Device ID string [len=%d]=\"%s\"\n",
1353 usblp->minor, length, &usblp->device_id_string[2]);
1354
1355 return length;
1356}
1357
1358static void usblp_disconnect(struct usb_interface *intf)
1359{
1360 struct usblp *usblp = usb_get_intfdata(intf);
1361
1362 usb_deregister_dev(intf, &usblp_class);
1363
1364 if (!usblp || !usblp->dev) {
1365 dev_err(&intf->dev, "bogus disconnect\n");
1366 BUG();
1367 }
1368
1369 mutex_lock(&usblp_mutex);
1370 mutex_lock(&usblp->mut);
1371 usblp->present = 0;
1372 wake_up(&usblp->wwait);
1373 wake_up(&usblp->rwait);
1374 usb_set_intfdata(intf, NULL);
1375
1376 usblp_unlink_urbs(usblp);
1377 mutex_unlock(&usblp->mut);
1378
1379 if (!usblp->used)
1380 usblp_cleanup(usblp);
1381 mutex_unlock(&usblp_mutex);
1382}
1383
1384static int usblp_suspend(struct usb_interface *intf, pm_message_t message)
1385{
1386 struct usblp *usblp = usb_get_intfdata(intf);
1387
1388 usblp_unlink_urbs(usblp);
1389#if 0 /* XXX Do we want this? What if someone is reading, should we fail? */
1390 /* not strictly necessary, but just in case */
1391 wake_up(&usblp->wwait);
1392 wake_up(&usblp->rwait);
1393#endif
1394
1395 return 0;
1396}
1397
1398static int usblp_resume(struct usb_interface *intf)
1399{
1400 struct usblp *usblp = usb_get_intfdata(intf);
1401 int r;
1402
1403 r = handle_bidir(usblp);
1404
1405 return r;
1406}
1407
1408static const struct usb_device_id usblp_ids[] = {
1409 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 1) },
1410 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 2) },
1411 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 3) },
1412 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 1) },
1413 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 2) },
1414 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 3) },
1415 { USB_DEVICE(0x04b8, 0x0202) }, /* Seiko Epson Receipt Printer M129C */
1416 { } /* Terminating entry */
1417};
1418
1419MODULE_DEVICE_TABLE(usb, usblp_ids);
1420
1421static struct usb_driver usblp_driver = {
1422 .name = "usblp",
1423 .probe = usblp_probe,
1424 .disconnect = usblp_disconnect,
1425 .suspend = usblp_suspend,
1426 .resume = usblp_resume,
1427 .id_table = usblp_ids,
1428 .dev_groups = usblp_groups,
1429 .supports_autosuspend = 1,
1430};
1431
1432module_usb_driver(usblp_driver);
1433
1434MODULE_AUTHOR(DRIVER_AUTHOR);
1435MODULE_DESCRIPTION(DRIVER_DESC);
1436module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1437MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1438MODULE_LICENSE("GPL");