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[PATCH] UFS: inode->i_sem is not released in error path
[linux-2.6/verdex.git] / drivers / usb / class / usblp.c
blobdba4cc0260770ebf8d6c39963cd8345c80a98b2a
1 /*
2 * usblp.c Version 0.13
3 *
4 * Copyright (c) 1999 Michael Gee <michael@linuxspecific.com>
5 * Copyright (c) 1999 Pavel Machek <pavel@suse.cz>
6 * Copyright (c) 2000 Randy Dunlap <rdunlap@xenotime.net>
7 * Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz>
8 # Copyright (c) 2001 Pete Zaitcev <zaitcev@redhat.com>
9 # Copyright (c) 2001 David Paschal <paschal@rcsis.com>
10 *
11 * USB Printer Device Class driver for USB printers and printer cables
12 *
13 * Sponsored by SuSE
14 *
15 * ChangeLog:
16 * v0.1 - thorough cleaning, URBification, almost a rewrite
17 * v0.2 - some more cleanups
18 * v0.3 - cleaner again, waitqueue fixes
19 * v0.4 - fixes in unidirectional mode
20 * v0.5 - add DEVICE_ID string support
21 * v0.6 - never time out
22 * v0.7 - fixed bulk-IN read and poll (David Paschal)
23 * v0.8 - add devfs support
24 * v0.9 - fix unplug-while-open paths
25 * v0.10- remove sleep_on, fix error on oom (oliver@neukum.org)
26 * v0.11 - add proto_bias option (Pete Zaitcev)
27 * v0.12 - add hpoj.sourceforge.net ioctls (David Paschal)
28 * v0.13 - alloc space for statusbuf (<status> not on stack);
29 * use usb_buffer_alloc() for read buf & write buf;
30 */
31
32 /*
33 * This program is free software; you can redistribute it and/or modify
34 * it under the terms of the GNU General Public License as published by
35 * the Free Software Foundation; either version 2 of the License, or
36 * (at your option) any later version.
37 *
38 * This program is distributed in the hope that it will be useful,
39 * but WITHOUT ANY WARRANTY; without even the implied warranty of
40 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
41 * GNU General Public License for more details.
42 *
43 * You should have received a copy of the GNU General Public License
44 * along with this program; if not, write to the Free Software
45 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
46 */
47
48 #include <linux/module.h>
49 #include <linux/kernel.h>
50 #include <linux/sched.h>
51 #include <linux/smp_lock.h>
52 #include <linux/signal.h>
53 #include <linux/poll.h>
54 #include <linux/init.h>
55 #include <linux/slab.h>
56 #include <linux/lp.h>
57 #undef DEBUG
58 #include <linux/usb.h>
59
60 /*
61 * Version Information
62 */
63 #define DRIVER_VERSION "v0.13"
64 #define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal"
65 #define DRIVER_DESC "USB Printer Device Class driver"
66
67 #define USBLP_BUF_SIZE 8192
68 #define USBLP_DEVICE_ID_SIZE 1024
69
70 /* ioctls: */
71 #define LPGETSTATUS 0x060b /* same as in drivers/char/lp.c */
72 #define IOCNR_GET_DEVICE_ID 1
73 #define IOCNR_GET_PROTOCOLS 2
74 #define IOCNR_SET_PROTOCOL 3
75 #define IOCNR_HP_SET_CHANNEL 4
76 #define IOCNR_GET_BUS_ADDRESS 5
77 #define IOCNR_GET_VID_PID 6
78 #define IOCNR_SOFT_RESET 7
79 /* Get device_id string: */
80 #define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len)
81 /* The following ioctls were added for http://hpoj.sourceforge.net: */
82 /* Get two-int array:
83 * [0]=current protocol (1=7/1/1, 2=7/1/2, 3=7/1/3),
84 * [1]=supported protocol mask (mask&(1<<n)!=0 means 7/1/n supported): */
85 #define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
86 /* Set protocol (arg: 1=7/1/1, 2=7/1/2, 3=7/1/3): */
87 #define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0)
88 /* Set channel number (HP Vendor-specific command): */
89 #define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0)
90 /* Get two-int array: [0]=bus number, [1]=device address: */
91 #define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len)
92 /* Get two-int array: [0]=vendor ID, [1]=product ID: */
93 #define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len)
94 /* Perform class specific soft reset */
95 #define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0);
96
97 /*
98 * A DEVICE_ID string may include the printer's serial number.
99 * It should end with a semi-colon (';').
100 * An example from an HP 970C DeskJet printer is (this is one long string,
101 * with the serial number changed):
102 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: ;
103 */
104
105 /*
106 * USB Printer Requests
107 */
108
109 #define USBLP_REQ_GET_ID 0x00
110 #define USBLP_REQ_GET_STATUS 0x01
111 #define USBLP_REQ_RESET 0x02
112 #define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST 0x00 /* HP Vendor-specific */
113
114 #define USBLP_MINORS 16
115 #define USBLP_MINOR_BASE 0
116
117 #define USBLP_WRITE_TIMEOUT (5000) /* 5 seconds */
118
119 #define USBLP_FIRST_PROTOCOL 1
120 #define USBLP_LAST_PROTOCOL 3
121 #define USBLP_MAX_PROTOCOLS (USBLP_LAST_PROTOCOL+1)
122
123 /*
124 * some arbitrary status buffer size;
125 * need a status buffer that is allocated via kmalloc(), not on stack
126 */
127 #define STATUS_BUF_SIZE 8
128
129 struct usblp {
130 struct usb_device *dev; /* USB device */
131 struct semaphore sem; /* locks this struct, especially "dev" */
132 char *writebuf; /* write transfer_buffer */
133 char *readbuf; /* read transfer_buffer */
134 char *statusbuf; /* status transfer_buffer */
135 struct urb *readurb, *writeurb; /* The urbs */
136 wait_queue_head_t wait; /* Zzzzz ... */
137 int readcount; /* Counter for reads */
138 int ifnum; /* Interface number */
139 struct usb_interface *intf; /* The interface */
140 /* Alternate-setting numbers and endpoints for each protocol
141 * (7/1/{index=1,2,3}) that the device supports: */
142 struct {
143 int alt_setting;
144 struct usb_endpoint_descriptor *epwrite;
145 struct usb_endpoint_descriptor *epread;
146 } protocol[USBLP_MAX_PROTOCOLS];
147 int current_protocol;
148 int minor; /* minor number of device */
149 int wcomplete; /* writing is completed */
150 int rcomplete; /* reading is completed */
151 unsigned int quirks; /* quirks flags */
152 unsigned char used; /* True if open */
153 unsigned char present; /* True if not disconnected */
154 unsigned char bidir; /* interface is bidirectional */
155 unsigned char *device_id_string; /* IEEE 1284 DEVICE ID string (ptr) */
156 /* first 2 bytes are (big-endian) length */
157 };
158
159 #ifdef DEBUG
160 static void usblp_dump(struct usblp *usblp) {
161 int p;
162
163 dbg("usblp=0x%p", usblp);
164 dbg("dev=0x%p", usblp->dev);
165 dbg("present=%d", usblp->present);
166 dbg("readbuf=0x%p", usblp->readbuf);
167 dbg("writebuf=0x%p", usblp->writebuf);
168 dbg("readurb=0x%p", usblp->readurb);
169 dbg("writeurb=0x%p", usblp->writeurb);
170 dbg("readcount=%d", usblp->readcount);
171 dbg("ifnum=%d", usblp->ifnum);
172 for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
173 dbg("protocol[%d].alt_setting=%d", p, usblp->protocol[p].alt_setting);
174 dbg("protocol[%d].epwrite=%p", p, usblp->protocol[p].epwrite);
175 dbg("protocol[%d].epread=%p", p, usblp->protocol[p].epread);
176 }
177 dbg("current_protocol=%d", usblp->current_protocol);
178 dbg("minor=%d", usblp->minor);
179 dbg("wcomplete=%d", usblp->wcomplete);
180 dbg("rcomplete=%d", usblp->rcomplete);
181 dbg("quirks=%d", usblp->quirks);
182 dbg("used=%d", usblp->used);
183 dbg("bidir=%d", usblp->bidir);
184 dbg("device_id_string=\"%s\"",
185 usblp->device_id_string ?
186 usblp->device_id_string + 2 :
187 (unsigned char *)"(null)");
188 }
189 #endif
190
191 /* Quirks: various printer quirks are handled by this table & its flags. */
192
193 struct quirk_printer_struct {
194 __u16 vendorId;
195 __u16 productId;
196 unsigned int quirks;
197 };
198
199 #define USBLP_QUIRK_BIDIR 0x1 /* reports bidir but requires unidirectional mode (no INs/reads) */
200 #define USBLP_QUIRK_USB_INIT 0x2 /* needs vendor USB init string */
201
202 static const struct quirk_printer_struct quirk_printers[] = {
203 { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
204 { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
205 { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
206 { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
207 { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
208 { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
209 { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */
210 { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */
211 { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
212 { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
213 { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
214 { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
215 { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
216 { 0, 0 }
217 };
218
219 static int usblp_select_alts(struct usblp *usblp);
220 static int usblp_set_protocol(struct usblp *usblp, int protocol);
221 static int usblp_cache_device_id_string(struct usblp *usblp);
222
223 /* forward reference to make our lives easier */
224 static struct usb_driver usblp_driver;
225 static DECLARE_MUTEX(usblp_sem); /* locks the existence of usblp's */
226
227 /*
228 * Functions for usblp control messages.
229 */
230
231 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
232 {
233 int retval;
234 int index = usblp->ifnum;
235
236 /* High byte has the interface index.
237 Low byte has the alternate setting.
238 */
239 if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) {
240 index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
241 }
242
243 retval = usb_control_msg(usblp->dev,
244 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
245 request, type | dir | recip, value, index, buf, len, USBLP_WRITE_TIMEOUT);
246 dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d",
247 request, !!dir, recip, value, index, len, retval);
248 return retval < 0 ? retval : 0;
249 }
250
251 #define usblp_read_status(usblp, status)\
252 usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
253 #define usblp_get_id(usblp, config, id, maxlen)\
254 usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
255 #define usblp_reset(usblp)\
256 usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
257
258 #define usblp_hp_channel_change_request(usblp, channel, buffer) \
259 usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
260
261 /*
262 * See the description for usblp_select_alts() below for the usage
263 * explanation. Look into your /proc/bus/usb/devices and dmesg in
264 * case of any trouble.
265 */
266 static int proto_bias = -1;
267
268 /*
269 * URB callback.
270 */
271
272 static void usblp_bulk_read(struct urb *urb, struct pt_regs *regs)
273 {
274 struct usblp *usblp = urb->context;
275
276 if (!usblp || !usblp->dev || !usblp->used || !usblp->present)
277 return;
278
279 if (unlikely(urb->status))
280 warn("usblp%d: nonzero read/write bulk status received: %d",
281 usblp->minor, urb->status);
282 usblp->rcomplete = 1;
283 wake_up_interruptible(&usblp->wait);
284 }
285
286 static void usblp_bulk_write(struct urb *urb, struct pt_regs *regs)
287 {
288 struct usblp *usblp = urb->context;
289
290 if (!usblp || !usblp->dev || !usblp->used || !usblp->present)
291 return;
292
293 if (unlikely(urb->status))
294 warn("usblp%d: nonzero read/write bulk status received: %d",
295 usblp->minor, urb->status);
296 usblp->wcomplete = 1;
297 wake_up_interruptible(&usblp->wait);
298 }
299
300 /*
301 * Get and print printer errors.
302 */
303
304 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
305
306 static int usblp_check_status(struct usblp *usblp, int err)
307 {
308 unsigned char status, newerr = 0;
309 int error;
310
311 error = usblp_read_status (usblp, usblp->statusbuf);
312 if (error < 0) {
313 if (printk_ratelimit())
314 err("usblp%d: error %d reading printer status",
315 usblp->minor, error);
316 return 0;
317 }
318
319 status = *usblp->statusbuf;
320
321 if (~status & LP_PERRORP)
322 newerr = 3;
323 if (status & LP_POUTPA)
324 newerr = 1;
325 if (~status & LP_PSELECD)
326 newerr = 2;
327
328 if (newerr != err)
329 info("usblp%d: %s", usblp->minor, usblp_messages[newerr]);
330
331 return newerr;
332 }
333
334 /*
335 * File op functions.
336 */
337
338 static int usblp_open(struct inode *inode, struct file *file)
339 {
340 int minor = iminor(inode);
341 struct usblp *usblp;
342 struct usb_interface *intf;
343 int retval;
344
345 if (minor < 0)
346 return -ENODEV;
347
348 down (&usblp_sem);
349
350 retval = -ENODEV;
351 intf = usb_find_interface(&usblp_driver, minor);
352 if (!intf) {
353 goto out;
354 }
355 usblp = usb_get_intfdata (intf);
356 if (!usblp || !usblp->dev || !usblp->present)
357 goto out;
358
359 retval = -EBUSY;
360 if (usblp->used)
361 goto out;
362
363 /*
364 * TODO: need to implement LP_ABORTOPEN + O_NONBLOCK as in drivers/char/lp.c ???
365 * This is #if 0-ed because we *don't* want to fail an open
366 * just because the printer is off-line.
367 */
368 #if 0
369 if ((retval = usblp_check_status(usblp, 0))) {
370 retval = retval > 1 ? -EIO : -ENOSPC;
371 goto out;
372 }
373 #else
374 retval = 0;
375 #endif
376
377 usblp->used = 1;
378 file->private_data = usblp;
379
380 usblp->writeurb->transfer_buffer_length = 0;
381 usblp->wcomplete = 1; /* we begin writeable */
382 usblp->rcomplete = 0;
383 usblp->writeurb->status = 0;
384 usblp->readurb->status = 0;
385
386 if (usblp->bidir) {
387 usblp->readcount = 0;
388 usblp->readurb->dev = usblp->dev;
389 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) {
390 retval = -EIO;
391 usblp->used = 0;
392 file->private_data = NULL;
393 }
394 }
395 out:
396 up (&usblp_sem);
397 return retval;
398 }
399
400 static void usblp_cleanup (struct usblp *usblp)
401 {
402 info("usblp%d: removed", usblp->minor);
403
404 kfree (usblp->device_id_string);
405 kfree (usblp->statusbuf);
406 usb_free_urb(usblp->writeurb);
407 usb_free_urb(usblp->readurb);
408 kfree (usblp);
409 }
410
411 static void usblp_unlink_urbs(struct usblp *usblp)
412 {
413 usb_kill_urb(usblp->writeurb);
414 if (usblp->bidir)
415 usb_kill_urb(usblp->readurb);
416 }
417
418 static int usblp_release(struct inode *inode, struct file *file)
419 {
420 struct usblp *usblp = file->private_data;
421
422 down (&usblp_sem);
423 usblp->used = 0;
424 if (usblp->present) {
425 usblp_unlink_urbs(usblp);
426 } else /* finish cleanup from disconnect */
427 usblp_cleanup (usblp);
428 up (&usblp_sem);
429 return 0;
430 }
431
432 /* No kernel lock - fine */
433 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
434 {
435 struct usblp *usblp = file->private_data;
436 poll_wait(file, &usblp->wait, wait);
437 return ((!usblp->bidir || !usblp->rcomplete) ? 0 : POLLIN | POLLRDNORM)
438 | (!usblp->wcomplete ? 0 : POLLOUT | POLLWRNORM);
439 }
440
441 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
442 {
443 struct usblp *usblp = file->private_data;
444 int length, err, i;
445 unsigned char newChannel;
446 int status;
447 int twoints[2];
448 int retval = 0;
449
450 down (&usblp->sem);
451 if (!usblp->present) {
452 retval = -ENODEV;
453 goto done;
454 }
455
456 dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd),
457 _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd) );
458
459 if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */
460
461 switch (_IOC_NR(cmd)) {
462
463 case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
464 if (_IOC_DIR(cmd) != _IOC_READ) {
465 retval = -EINVAL;
466 goto done;
467 }
468
469 length = usblp_cache_device_id_string(usblp);
470 if (length < 0) {
471 retval = length;
472 goto done;
473 }
474 if (length > _IOC_SIZE(cmd))
475 length = _IOC_SIZE(cmd); /* truncate */
476
477 if (copy_to_user((void __user *) arg,
478 usblp->device_id_string,
479 (unsigned long) length)) {
480 retval = -EFAULT;
481 goto done;
482 }
483
484 break;
485
486 case IOCNR_GET_PROTOCOLS:
487 if (_IOC_DIR(cmd) != _IOC_READ ||
488 _IOC_SIZE(cmd) < sizeof(twoints)) {
489 retval = -EINVAL;
490 goto done;
491 }
492
493 twoints[0] = usblp->current_protocol;
494 twoints[1] = 0;
495 for (i = USBLP_FIRST_PROTOCOL;
496 i <= USBLP_LAST_PROTOCOL; i++) {
497 if (usblp->protocol[i].alt_setting >= 0)
498 twoints[1] |= (1<<i);
499 }
500
501 if (copy_to_user((void __user *)arg,
502 (unsigned char *)twoints,
503 sizeof(twoints))) {
504 retval = -EFAULT;
505 goto done;
506 }
507
508 break;
509
510 case IOCNR_SET_PROTOCOL:
511 if (_IOC_DIR(cmd) != _IOC_WRITE) {
512 retval = -EINVAL;
513 goto done;
514 }
515
516 #ifdef DEBUG
517 if (arg == -10) {
518 usblp_dump(usblp);
519 break;
520 }
521 #endif
522
523 usblp_unlink_urbs(usblp);
524 retval = usblp_set_protocol(usblp, arg);
525 if (retval < 0) {
526 usblp_set_protocol(usblp,
527 usblp->current_protocol);
528 }
529 break;
530
531 case IOCNR_HP_SET_CHANNEL:
532 if (_IOC_DIR(cmd) != _IOC_WRITE ||
533 le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
534 usblp->quirks & USBLP_QUIRK_BIDIR) {
535 retval = -EINVAL;
536 goto done;
537 }
538
539 err = usblp_hp_channel_change_request(usblp,
540 arg, &newChannel);
541 if (err < 0) {
542 err("usblp%d: error = %d setting "
543 "HP channel",
544 usblp->minor, err);
545 retval = -EIO;
546 goto done;
547 }
548
549 dbg("usblp%d requested/got HP channel %ld/%d",
550 usblp->minor, arg, newChannel);
551 break;
552
553 case IOCNR_GET_BUS_ADDRESS:
554 if (_IOC_DIR(cmd) != _IOC_READ ||
555 _IOC_SIZE(cmd) < sizeof(twoints)) {
556 retval = -EINVAL;
557 goto done;
558 }
559
560 twoints[0] = usblp->dev->bus->busnum;
561 twoints[1] = usblp->dev->devnum;
562 if (copy_to_user((void __user *)arg,
563 (unsigned char *)twoints,
564 sizeof(twoints))) {
565 retval = -EFAULT;
566 goto done;
567 }
568
569 dbg("usblp%d is bus=%d, device=%d",
570 usblp->minor, twoints[0], twoints[1]);
571 break;
572
573 case IOCNR_GET_VID_PID:
574 if (_IOC_DIR(cmd) != _IOC_READ ||
575 _IOC_SIZE(cmd) < sizeof(twoints)) {
576 retval = -EINVAL;
577 goto done;
578 }
579
580 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
581 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
582 if (copy_to_user((void __user *)arg,
583 (unsigned char *)twoints,
584 sizeof(twoints))) {
585 retval = -EFAULT;
586 goto done;
587 }
588
589 dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X",
590 usblp->minor, twoints[0], twoints[1]);
591 break;
592
593 case IOCNR_SOFT_RESET:
594 if (_IOC_DIR(cmd) != _IOC_NONE) {
595 retval = -EINVAL;
596 goto done;
597 }
598 retval = usblp_reset(usblp);
599 break;
600 default:
601 retval = -ENOTTY;
602 }
603 else /* old-style ioctl value */
604 switch (cmd) {
605
606 case LPGETSTATUS:
607 if (usblp_read_status(usblp, usblp->statusbuf)) {
608 if (printk_ratelimit())
609 err("usblp%d: failed reading printer status",
610 usblp->minor);
611 retval = -EIO;
612 goto done;
613 }
614 status = *usblp->statusbuf;
615 if (copy_to_user ((void __user *)arg, &status, sizeof(int)))
616 retval = -EFAULT;
617 break;
618
619 default:
620 retval = -ENOTTY;
621 }
622
623 done:
624 up (&usblp->sem);
625 return retval;
626 }
627
628 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
629 {
630 DECLARE_WAITQUEUE(wait, current);
631 struct usblp *usblp = file->private_data;
632 int timeout, err = 0, transfer_length = 0;
633 size_t writecount = 0;
634
635 while (writecount < count) {
636 if (!usblp->wcomplete) {
637 barrier();
638 if (file->f_flags & O_NONBLOCK) {
639 writecount += transfer_length;
640 return writecount ? writecount : -EAGAIN;
641 }
642
643 timeout = USBLP_WRITE_TIMEOUT;
644 add_wait_queue(&usblp->wait, &wait);
645 while ( 1==1 ) {
646
647 if (signal_pending(current)) {
648 remove_wait_queue(&usblp->wait, &wait);
649 return writecount ? writecount : -EINTR;
650 }
651 set_current_state(TASK_INTERRUPTIBLE);
652 if (timeout && !usblp->wcomplete) {
653 timeout = schedule_timeout(timeout);
654 } else {
655 set_current_state(TASK_RUNNING);
656 break;
657 }
658 }
659 remove_wait_queue(&usblp->wait, &wait);
660 }
661
662 down (&usblp->sem);
663 if (!usblp->present) {
664 up (&usblp->sem);
665 return -ENODEV;
666 }
667
668 if (usblp->writeurb->status != 0) {
669 if (usblp->quirks & USBLP_QUIRK_BIDIR) {
670 if (!usblp->wcomplete)
671 err("usblp%d: error %d writing to printer",
672 usblp->minor, usblp->writeurb->status);
673 err = usblp->writeurb->status;
674 } else
675 err = usblp_check_status(usblp, err);
676 up (&usblp->sem);
677
678 /* if the fault was due to disconnect, let khubd's
679 * call to usblp_disconnect() grab usblp->sem ...
680 */
681 schedule ();
682 continue;
683 }
684
685 /* We must increment writecount here, and not at the
686 * end of the loop. Otherwise, the final loop iteration may
687 * be skipped, leading to incomplete printer output.
688 */
689 writecount += transfer_length;
690 if (writecount == count) {
691 up(&usblp->sem);
692 break;
693 }
694
695 transfer_length=(count - writecount);
696 if (transfer_length > USBLP_BUF_SIZE)
697 transfer_length = USBLP_BUF_SIZE;
698
699 usblp->writeurb->transfer_buffer_length = transfer_length;
700
701 if (copy_from_user(usblp->writeurb->transfer_buffer,
702 buffer + writecount, transfer_length)) {
703 up(&usblp->sem);
704 return writecount ? writecount : -EFAULT;
705 }
706
707 usblp->writeurb->dev = usblp->dev;
708 usblp->wcomplete = 0;
709 err = usb_submit_urb(usblp->writeurb, GFP_KERNEL);
710 if (err) {
711 if (err != -ENOMEM)
712 count = -EIO;
713 else
714 count = writecount ? writecount : -ENOMEM;
715 up (&usblp->sem);
716 break;
717 }
718 up (&usblp->sem);
719 }
720
721 return count;
722 }
723
724 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
725 {
726 struct usblp *usblp = file->private_data;
727 DECLARE_WAITQUEUE(wait, current);
728
729 if (!usblp->bidir)
730 return -EINVAL;
731
732 down (&usblp->sem);
733 if (!usblp->present) {
734 count = -ENODEV;
735 goto done;
736 }
737
738 if (!usblp->rcomplete) {
739 barrier();
740
741 if (file->f_flags & O_NONBLOCK) {
742 count = -EAGAIN;
743 goto done;
744 }
745
746 add_wait_queue(&usblp->wait, &wait);
747 while (1==1) {
748 if (signal_pending(current)) {
749 count = -EINTR;
750 remove_wait_queue(&usblp->wait, &wait);
751 goto done;
752 }
753 up (&usblp->sem);
754 set_current_state(TASK_INTERRUPTIBLE);
755 if (!usblp->rcomplete) {
756 schedule();
757 } else {
758 set_current_state(TASK_RUNNING);
759 down(&usblp->sem);
760 break;
761 }
762 down (&usblp->sem);
763 }
764 remove_wait_queue(&usblp->wait, &wait);
765 }
766
767 if (!usblp->present) {
768 count = -ENODEV;
769 goto done;
770 }
771
772 if (usblp->readurb->status) {
773 err("usblp%d: error %d reading from printer",
774 usblp->minor, usblp->readurb->status);
775 usblp->readurb->dev = usblp->dev;
776 usblp->readcount = 0;
777 usblp->rcomplete = 0;
778 if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0)
779 dbg("error submitting urb");
780 count = -EIO;
781 goto done;
782 }
783
784 count = count < usblp->readurb->actual_length - usblp->readcount ?
785 count : usblp->readurb->actual_length - usblp->readcount;
786
787 if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) {
788 count = -EFAULT;
789 goto done;
790 }
791
792 if ((usblp->readcount += count) == usblp->readurb->actual_length) {
793 usblp->readcount = 0;
794 usblp->readurb->dev = usblp->dev;
795 usblp->rcomplete = 0;
796 if (usb_submit_urb(usblp->readurb, GFP_KERNEL)) {
797 count = -EIO;
798 goto done;
799 }
800 }
801
802 done:
803 up (&usblp->sem);
804 return count;
805 }
806
807 /*
808 * Checks for printers that have quirks, such as requiring unidirectional
809 * communication but reporting bidirectional; currently some HP printers
810 * have this flaw (HP 810, 880, 895, etc.), or needing an init string
811 * sent at each open (like some Epsons).
812 * Returns 1 if found, 0 if not found.
813 *
814 * HP recommended that we use the bidirectional interface but
815 * don't attempt any bulk IN transfers from the IN endpoint.
816 * Here's some more detail on the problem:
817 * The problem is not that it isn't bidirectional though. The problem
818 * is that if you request a device ID, or status information, while
819 * the buffers are full, the return data will end up in the print data
820 * buffer. For example if you make sure you never request the device ID
821 * while you are sending print data, and you don't try to query the
822 * printer status every couple of milliseconds, you will probably be OK.
823 */
824 static unsigned int usblp_quirks (__u16 vendor, __u16 product)
825 {
826 int i;
827
828 for (i = 0; quirk_printers[i].vendorId; i++) {
829 if (vendor == quirk_printers[i].vendorId &&
830 product == quirk_printers[i].productId)
831 return quirk_printers[i].quirks;
832 }
833 return 0;
834 }
835
836 static struct file_operations usblp_fops = {
837 .owner = THIS_MODULE,
838 .read = usblp_read,
839 .write = usblp_write,
840 .poll = usblp_poll,
841 .unlocked_ioctl = usblp_ioctl,
842 .compat_ioctl = usblp_ioctl,
843 .open = usblp_open,
844 .release = usblp_release,
845 };
846
847 static struct usb_class_driver usblp_class = {
848 .name = "lp%d",
849 .fops = &usblp_fops,
850 .minor_base = USBLP_MINOR_BASE,
851 };
852
853 static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf)
854 {
855 struct usb_interface *intf = to_usb_interface(dev);
856 struct usblp *usblp = usb_get_intfdata (intf);
857
858 if (usblp->device_id_string[0] == 0 &&
859 usblp->device_id_string[1] == 0)
860 return 0;
861
862 return sprintf(buf, "%s", usblp->device_id_string+2);
863 }
864
865 static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL);
866
867 static int usblp_probe(struct usb_interface *intf,
868 const struct usb_device_id *id)
869 {
870 struct usb_device *dev = interface_to_usbdev (intf);
871 struct usblp *usblp = NULL;
872 int protocol;
873 int retval;
874
875 /* Malloc and start initializing usblp structure so we can use it
876 * directly. */
877 if (!(usblp = kmalloc(sizeof(struct usblp), GFP_KERNEL))) {
878 err("out of memory for usblp");
879 goto abort;
880 }
881 memset(usblp, 0, sizeof(struct usblp));
882 usblp->dev = dev;
883 init_MUTEX (&usblp->sem);
884 init_waitqueue_head(&usblp->wait);
885 usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
886 usblp->intf = intf;
887
888 usblp->writeurb = usb_alloc_urb(0, GFP_KERNEL);
889 if (!usblp->writeurb) {
890 err("out of memory");
891 goto abort;
892 }
893 usblp->readurb = usb_alloc_urb(0, GFP_KERNEL);
894 if (!usblp->readurb) {
895 err("out of memory");
896 goto abort;
897 }
898
899 /* Malloc device ID string buffer to the largest expected length,
900 * since we can re-query it on an ioctl and a dynamic string
901 * could change in length. */
902 if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
903 err("out of memory for device_id_string");
904 goto abort;
905 }
906
907 usblp->writebuf = usblp->readbuf = NULL;
908 usblp->writeurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
909 usblp->readurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
910 /* Malloc write & read buffers. We somewhat wastefully
911 * malloc both regardless of bidirectionality, because the
912 * alternate setting can be changed later via an ioctl. */
913 if (!(usblp->writebuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
914 GFP_KERNEL, &usblp->writeurb->transfer_dma))) {
915 err("out of memory for write buf");
916 goto abort;
917 }
918 if (!(usblp->readbuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
919 GFP_KERNEL, &usblp->readurb->transfer_dma))) {
920 err("out of memory for read buf");
921 goto abort;
922 }
923
924 /* Allocate buffer for printer status */
925 usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
926 if (!usblp->statusbuf) {
927 err("out of memory for statusbuf");
928 goto abort;
929 }
930
931 /* Lookup quirks for this printer. */
932 usblp->quirks = usblp_quirks(
933 le16_to_cpu(dev->descriptor.idVendor),
934 le16_to_cpu(dev->descriptor.idProduct));
935
936 /* Analyze and pick initial alternate settings and endpoints. */
937 protocol = usblp_select_alts(usblp);
938 if (protocol < 0) {
939 dbg("incompatible printer-class device 0x%4.4X/0x%4.4X",
940 le16_to_cpu(dev->descriptor.idVendor),
941 le16_to_cpu(dev->descriptor.idProduct));
942 goto abort;
943 }
944
945 /* Setup the selected alternate setting and endpoints. */
946 if (usblp_set_protocol(usblp, protocol) < 0)
947 goto abort;
948
949 /* Retrieve and store the device ID string. */
950 usblp_cache_device_id_string(usblp);
951 device_create_file(&intf->dev, &dev_attr_ieee1284_id);
952
953 #ifdef DEBUG
954 usblp_check_status(usblp, 0);
955 #endif
956
957 usb_set_intfdata (intf, usblp);
958
959 usblp->present = 1;
960
961 retval = usb_register_dev(intf, &usblp_class);
962 if (retval) {
963 err("Not able to get a minor for this device.");
964 goto abort_intfdata;
965 }
966 usblp->minor = intf->minor;
967 info("usblp%d: USB %sdirectional printer dev %d "
968 "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X",
969 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
970 usblp->ifnum,
971 usblp->protocol[usblp->current_protocol].alt_setting,
972 usblp->current_protocol,
973 le16_to_cpu(usblp->dev->descriptor.idVendor),
974 le16_to_cpu(usblp->dev->descriptor.idProduct));
975
976 return 0;
977
978 abort_intfdata:
979 usb_set_intfdata (intf, NULL);
980 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
981 abort:
982 if (usblp) {
983 if (usblp->writebuf)
984 usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
985 usblp->writebuf, usblp->writeurb->transfer_dma);
986 if (usblp->readbuf)
987 usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
988 usblp->readbuf, usblp->writeurb->transfer_dma);
989 kfree(usblp->statusbuf);
990 kfree(usblp->device_id_string);
991 usb_free_urb(usblp->writeurb);
992 usb_free_urb(usblp->readurb);
993 kfree(usblp);
994 }
995 return -EIO;
996 }
997
998 /*
999 * We are a "new" style driver with usb_device_id table,
1000 * but our requirements are too intricate for simple match to handle.
1001 *
1002 * The "proto_bias" option may be used to specify the preferred protocol
1003 * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3). If the device
1004 * supports the preferred protocol, then we bind to it.
1005 *
1006 * The best interface for us is 7/1/2, because it is compatible
1007 * with a stream of characters. If we find it, we bind to it.
1008 *
1009 * Note that the people from hpoj.sourceforge.net need to be able to
1010 * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
1011 *
1012 * Failing 7/1/2, we look for 7/1/3, even though it's probably not
1013 * stream-compatible, because this matches the behaviour of the old code.
1014 *
1015 * If nothing else, we bind to 7/1/1 - the unidirectional interface.
1016 */
1017 static int usblp_select_alts(struct usblp *usblp)
1018 {
1019 struct usb_interface *if_alt;
1020 struct usb_host_interface *ifd;
1021 struct usb_endpoint_descriptor *epd, *epwrite, *epread;
1022 int p, i, e;
1023
1024 if_alt = usblp->intf;
1025
1026 for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1027 usblp->protocol[p].alt_setting = -1;
1028
1029 /* Find out what we have. */
1030 for (i = 0; i < if_alt->num_altsetting; i++) {
1031 ifd = &if_alt->altsetting[i];
1032
1033 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
1034 continue;
1035
1036 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1037 ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1038 continue;
1039
1040 /* Look for bulk OUT and IN endpoints. */
1041 epwrite = epread = NULL;
1042 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1043 epd = &ifd->endpoint[e].desc;
1044
1045 if ((epd->bmAttributes&USB_ENDPOINT_XFERTYPE_MASK)!=
1046 USB_ENDPOINT_XFER_BULK)
1047 continue;
1048
1049 if (!(epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK)) {
1050 if (!epwrite)
1051 epwrite = epd;
1052
1053 } else {
1054 if (!epread)
1055 epread = epd;
1056 }
1057 }
1058
1059 /* Ignore buggy hardware without the right endpoints. */
1060 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1061 continue;
1062
1063 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1064 * and buggy bidirectional printers. */
1065 if (ifd->desc.bInterfaceProtocol == 1) {
1066 epread = NULL;
1067 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1068 info("Disabling reads from problem bidirectional "
1069 "printer on usblp%d", usblp->minor);
1070 epread = NULL;
1071 }
1072
1073 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1074 ifd->desc.bAlternateSetting;
1075 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1076 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1077 }
1078
1079 /* If our requested protocol is supported, then use it. */
1080 if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1081 proto_bias <= USBLP_LAST_PROTOCOL &&
1082 usblp->protocol[proto_bias].alt_setting != -1)
1083 return proto_bias;
1084
1085 /* Ordering is important here. */
1086 if (usblp->protocol[2].alt_setting != -1)
1087 return 2;
1088 if (usblp->protocol[1].alt_setting != -1)
1089 return 1;
1090 if (usblp->protocol[3].alt_setting != -1)
1091 return 3;
1092
1093 /* If nothing is available, then don't bind to this device. */
1094 return -1;
1095 }
1096
1097 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1098 {
1099 int r, alts;
1100
1101 if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1102 return -EINVAL;
1103
1104 alts = usblp->protocol[protocol].alt_setting;
1105 if (alts < 0)
1106 return -EINVAL;
1107 r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1108 if (r < 0) {
1109 err("can't set desired altsetting %d on interface %d",
1110 alts, usblp->ifnum);
1111 return r;
1112 }
1113
1114 usb_fill_bulk_urb(usblp->writeurb, usblp->dev,
1115 usb_sndbulkpipe(usblp->dev,
1116 usblp->protocol[protocol].epwrite->bEndpointAddress),
1117 usblp->writebuf, 0,
1118 usblp_bulk_write, usblp);
1119
1120 usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1121 if (usblp->bidir)
1122 usb_fill_bulk_urb(usblp->readurb, usblp->dev,
1123 usb_rcvbulkpipe(usblp->dev,
1124 usblp->protocol[protocol].epread->bEndpointAddress),
1125 usblp->readbuf, USBLP_BUF_SIZE,
1126 usblp_bulk_read, usblp);
1127
1128 usblp->current_protocol = protocol;
1129 dbg("usblp%d set protocol %d", usblp->minor, protocol);
1130 return 0;
1131 }
1132
1133 /* Retrieves and caches device ID string.
1134 * Returns length, including length bytes but not null terminator.
1135 * On error, returns a negative errno value. */
1136 static int usblp_cache_device_id_string(struct usblp *usblp)
1137 {
1138 int err, length;
1139
1140 err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1141 if (err < 0) {
1142 dbg("usblp%d: error = %d reading IEEE-1284 Device ID string",
1143 usblp->minor, err);
1144 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1145 return -EIO;
1146 }
1147
1148 /* First two bytes are length in big-endian.
1149 * They count themselves, and we copy them into
1150 * the user's buffer. */
1151 length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1152 if (length < 2)
1153 length = 2;
1154 else if (length >= USBLP_DEVICE_ID_SIZE)
1155 length = USBLP_DEVICE_ID_SIZE - 1;
1156 usblp->device_id_string[length] = '\0';
1157
1158 dbg("usblp%d Device ID string [len=%d]=\"%s\"",
1159 usblp->minor, length, &usblp->device_id_string[2]);
1160
1161 return length;
1162 }
1163
1164 static void usblp_disconnect(struct usb_interface *intf)
1165 {
1166 struct usblp *usblp = usb_get_intfdata (intf);
1167
1168 usb_deregister_dev(intf, &usblp_class);
1169
1170 if (!usblp || !usblp->dev) {
1171 err("bogus disconnect");
1172 BUG ();
1173 }
1174
1175 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1176
1177 down (&usblp_sem);
1178 down (&usblp->sem);
1179 usblp->present = 0;
1180 usb_set_intfdata (intf, NULL);
1181
1182 usblp_unlink_urbs(usblp);
1183 usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1184 usblp->writebuf, usblp->writeurb->transfer_dma);
1185 usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
1186 usblp->readbuf, usblp->readurb->transfer_dma);
1187 up (&usblp->sem);
1188
1189 if (!usblp->used)
1190 usblp_cleanup (usblp);
1191 up (&usblp_sem);
1192 }
1193
1194 static struct usb_device_id usblp_ids [] = {
1195 { USB_DEVICE_INFO(7, 1, 1) },
1196 { USB_DEVICE_INFO(7, 1, 2) },
1197 { USB_DEVICE_INFO(7, 1, 3) },
1198 { USB_INTERFACE_INFO(7, 1, 1) },
1199 { USB_INTERFACE_INFO(7, 1, 2) },
1200 { USB_INTERFACE_INFO(7, 1, 3) },
1201 { } /* Terminating entry */
1202 };
1203
1204 MODULE_DEVICE_TABLE (usb, usblp_ids);
1205
1206 static struct usb_driver usblp_driver = {
1207 .name = "usblp",
1208 .probe = usblp_probe,
1209 .disconnect = usblp_disconnect,
1210 .id_table = usblp_ids,
1211 };
1212
1213 static int __init usblp_init(void)
1214 {
1215 int retval;
1216 retval = usb_register(&usblp_driver);
1217 if (retval)
1218 goto out;
1219 info(DRIVER_VERSION ": " DRIVER_DESC);
1220 out:
1221 return retval;
1222 }
1223
1224 static void __exit usblp_exit(void)
1225 {
1226 usb_deregister(&usblp_driver);
1227 }
1228
1229 module_init(usblp_init);
1230 module_exit(usblp_exit);
1231
1232 MODULE_AUTHOR( DRIVER_AUTHOR );
1233 MODULE_DESCRIPTION( DRIVER_DESC );
1234 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1235 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1236 MODULE_LICENSE("GPL");
Verdex Pro support