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x86, mrst: use a temporary variable for SFI irq
[linux-btrfs-devel.git] / drivers / usb / class / usblp.c
blobcb3a93243a052f6bdb4f6455c0f4e44a54e82ee9
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):
104 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: ;
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 */
138 struct 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
173 static 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
204 struct quirk_printer_struct {
205 __u16 vendorId;
206 __u16 productId;
207 unsigned int quirks;
208 };
209
210 #define USBLP_QUIRK_BIDIR 0x1 /* reports bidir but requires unidirectional mode (no INs/reads) */
211 #define USBLP_QUIRK_USB_INIT 0x2 /* needs vendor USB init string */
212 #define USBLP_QUIRK_BAD_CLASS 0x4 /* descriptor uses vendor-specific Class or SubClass */
213
214 static const struct quirk_printer_struct quirk_printers[] = {
215 { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
216 { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
217 { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
218 { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
219 { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
220 { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
221 { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */
222 { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */
223 { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
224 { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
225 { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
226 { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
227 { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
228 { 0x0482, 0x0010, USBLP_QUIRK_BIDIR }, /* Kyocera Mita FS 820, by zut <kernel@zut.de> */
229 { 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
234 static int usblp_wwait(struct usblp *usblp, int nonblock);
235 static int usblp_wtest(struct usblp *usblp, int nonblock);
236 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock);
237 static int usblp_rtest(struct usblp *usblp, int nonblock);
238 static int usblp_submit_read(struct usblp *usblp);
239 static int usblp_select_alts(struct usblp *usblp);
240 static int usblp_set_protocol(struct usblp *usblp, int protocol);
241 static int usblp_cache_device_id_string(struct usblp *usblp);
242
243 /* forward reference to make our lives easier */
244 static struct usb_driver usblp_driver;
245 static DEFINE_MUTEX(usblp_mutex); /* locks the existence of usblp's */
246
247 /*
248 * Functions for usblp control messages.
249 */
250
251 static 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 */
285 static int proto_bias = -1;
286
287 /*
288 * URB callback.
289 */
290
291 static void usblp_bulk_read(struct urb *urb)
292 {
293 struct usblp *usblp = urb->context;
294 int status = urb->status;
295
296 if (usblp->present && usblp->used) {
297 if (status)
298 printk(KERN_WARNING "usblp%d: "
299 "nonzero read bulk status received: %d\n",
300 usblp->minor, status);
301 }
302 spin_lock(&usblp->lock);
303 if (status < 0)
304 usblp->rstatus = status;
305 else
306 usblp->rstatus = urb->actual_length;
307 usblp->rcomplete = 1;
308 wake_up(&usblp->rwait);
309 spin_unlock(&usblp->lock);
310
311 usb_free_urb(urb);
312 }
313
314 static void usblp_bulk_write(struct urb *urb)
315 {
316 struct usblp *usblp = urb->context;
317 int status = urb->status;
318
319 if (usblp->present && usblp->used) {
320 if (status)
321 printk(KERN_WARNING "usblp%d: "
322 "nonzero write bulk status received: %d\n",
323 usblp->minor, status);
324 }
325 spin_lock(&usblp->lock);
326 if (status < 0)
327 usblp->wstatus = status;
328 else
329 usblp->wstatus = urb->actual_length;
330 usblp->no_paper = 0;
331 usblp->wcomplete = 1;
332 wake_up(&usblp->wwait);
333 spin_unlock(&usblp->lock);
334
335 usb_free_urb(urb);
336 }
337
338 /*
339 * Get and print printer errors.
340 */
341
342 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
343
344 static int usblp_check_status(struct usblp *usblp, int err)
345 {
346 unsigned char status, newerr = 0;
347 int error;
348
349 mutex_lock(&usblp->mut);
350 if ((error = usblp_read_status(usblp, usblp->statusbuf)) < 0) {
351 mutex_unlock(&usblp->mut);
352 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
375 static int handle_bidir(struct usblp *usblp)
376 {
377 if (usblp->bidir && usblp->used) {
378 if (usblp_submit_read(usblp) < 0)
379 return -EIO;
380 }
381 return 0;
382 }
383
384 /*
385 * File op functions.
386 */
387
388 static int usblp_open(struct inode *inode, struct file *file)
389 {
390 int minor = iminor(inode);
391 struct usblp *usblp;
392 struct usb_interface *intf;
393 int retval;
394
395 if (minor < 0)
396 return -ENODEV;
397
398 mutex_lock(&usblp_mutex);
399
400 retval = -ENODEV;
401 intf = usb_find_interface(&usblp_driver, minor);
402 if (!intf)
403 goto out;
404 usblp = usb_get_intfdata(intf);
405 if (!usblp || !usblp->dev || !usblp->present)
406 goto out;
407
408 retval = -EBUSY;
409 if (usblp->used)
410 goto out;
411
412 /*
413 * We do not implement LP_ABORTOPEN/LPABORTOPEN for two reasons:
414 * - We do not want persistent state which close(2) does not clear
415 * - It is not used anyway, according to CUPS people
416 */
417
418 retval = usb_autopm_get_interface(intf);
419 if (retval < 0)
420 goto out;
421 usblp->used = 1;
422 file->private_data = usblp;
423
424 usblp->wcomplete = 1; /* we begin writeable */
425 usblp->wstatus = 0;
426 usblp->rcomplete = 0;
427
428 if (handle_bidir(usblp) < 0) {
429 usb_autopm_put_interface(intf);
430 usblp->used = 0;
431 file->private_data = NULL;
432 retval = -EIO;
433 }
434 out:
435 mutex_unlock(&usblp_mutex);
436 return retval;
437 }
438
439 static void usblp_cleanup(struct usblp *usblp)
440 {
441 printk(KERN_INFO "usblp%d: removed\n", usblp->minor);
442
443 kfree(usblp->readbuf);
444 kfree(usblp->device_id_string);
445 kfree(usblp->statusbuf);
446 kfree(usblp);
447 }
448
449 static void usblp_unlink_urbs(struct usblp *usblp)
450 {
451 usb_kill_anchored_urbs(&usblp->urbs);
452 }
453
454 static int usblp_release(struct inode *inode, struct file *file)
455 {
456 struct usblp *usblp = file->private_data;
457
458 usblp->flags &= ~LP_ABORT;
459
460 mutex_lock(&usblp_mutex);
461 usblp->used = 0;
462 if (usblp->present) {
463 usblp_unlink_urbs(usblp);
464 usb_autopm_put_interface(usblp->intf);
465 } else /* finish cleanup from disconnect */
466 usblp_cleanup(usblp);
467 mutex_unlock(&usblp_mutex);
468 return 0;
469 }
470
471 /* No kernel lock - fine */
472 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
473 {
474 int ret;
475 unsigned long flags;
476
477 struct usblp *usblp = file->private_data;
478 /* Should we check file->f_mode & FMODE_WRITE before poll_wait()? */
479 poll_wait(file, &usblp->rwait, wait);
480 poll_wait(file, &usblp->wwait, wait);
481 spin_lock_irqsave(&usblp->lock, flags);
482 ret = ((usblp->bidir && usblp->rcomplete) ? POLLIN | POLLRDNORM : 0) |
483 ((usblp->no_paper || usblp->wcomplete) ? POLLOUT | POLLWRNORM : 0);
484 spin_unlock_irqrestore(&usblp->lock, flags);
485 return ret;
486 }
487
488 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
489 {
490 struct usblp *usblp = file->private_data;
491 int length, err, i;
492 unsigned char newChannel;
493 int status;
494 int twoints[2];
495 int retval = 0;
496
497 mutex_lock(&usblp->mut);
498 if (!usblp->present) {
499 retval = -ENODEV;
500 goto done;
501 }
502
503 dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd),
504 _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd));
505
506 if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */
507
508 switch (_IOC_NR(cmd)) {
509
510 case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
511 if (_IOC_DIR(cmd) != _IOC_READ) {
512 retval = -EINVAL;
513 goto done;
514 }
515
516 length = usblp_cache_device_id_string(usblp);
517 if (length < 0) {
518 retval = length;
519 goto done;
520 }
521 if (length > _IOC_SIZE(cmd))
522 length = _IOC_SIZE(cmd); /* truncate */
523
524 if (copy_to_user((void __user *) arg,
525 usblp->device_id_string,
526 (unsigned long) length)) {
527 retval = -EFAULT;
528 goto done;
529 }
530
531 break;
532
533 case IOCNR_GET_PROTOCOLS:
534 if (_IOC_DIR(cmd) != _IOC_READ ||
535 _IOC_SIZE(cmd) < sizeof(twoints)) {
536 retval = -EINVAL;
537 goto done;
538 }
539
540 twoints[0] = usblp->current_protocol;
541 twoints[1] = 0;
542 for (i = USBLP_FIRST_PROTOCOL;
543 i <= USBLP_LAST_PROTOCOL; i++) {
544 if (usblp->protocol[i].alt_setting >= 0)
545 twoints[1] |= (1<<i);
546 }
547
548 if (copy_to_user((void __user *)arg,
549 (unsigned char *)twoints,
550 sizeof(twoints))) {
551 retval = -EFAULT;
552 goto done;
553 }
554
555 break;
556
557 case IOCNR_SET_PROTOCOL:
558 if (_IOC_DIR(cmd) != _IOC_WRITE) {
559 retval = -EINVAL;
560 goto done;
561 }
562
563 #ifdef DEBUG
564 if (arg == -10) {
565 usblp_dump(usblp);
566 break;
567 }
568 #endif
569
570 usblp_unlink_urbs(usblp);
571 retval = usblp_set_protocol(usblp, arg);
572 if (retval < 0) {
573 usblp_set_protocol(usblp,
574 usblp->current_protocol);
575 }
576 break;
577
578 case IOCNR_HP_SET_CHANNEL:
579 if (_IOC_DIR(cmd) != _IOC_WRITE ||
580 le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
581 usblp->quirks & USBLP_QUIRK_BIDIR) {
582 retval = -EINVAL;
583 goto done;
584 }
585
586 err = usblp_hp_channel_change_request(usblp,
587 arg, &newChannel);
588 if (err < 0) {
589 dev_err(&usblp->dev->dev,
590 "usblp%d: error = %d setting "
591 "HP channel\n",
592 usblp->minor, err);
593 retval = -EIO;
594 goto done;
595 }
596
597 dbg("usblp%d requested/got HP channel %ld/%d",
598 usblp->minor, arg, newChannel);
599 break;
600
601 case IOCNR_GET_BUS_ADDRESS:
602 if (_IOC_DIR(cmd) != _IOC_READ ||
603 _IOC_SIZE(cmd) < sizeof(twoints)) {
604 retval = -EINVAL;
605 goto done;
606 }
607
608 twoints[0] = usblp->dev->bus->busnum;
609 twoints[1] = usblp->dev->devnum;
610 if (copy_to_user((void __user *)arg,
611 (unsigned char *)twoints,
612 sizeof(twoints))) {
613 retval = -EFAULT;
614 goto done;
615 }
616
617 dbg("usblp%d is bus=%d, device=%d",
618 usblp->minor, twoints[0], twoints[1]);
619 break;
620
621 case IOCNR_GET_VID_PID:
622 if (_IOC_DIR(cmd) != _IOC_READ ||
623 _IOC_SIZE(cmd) < sizeof(twoints)) {
624 retval = -EINVAL;
625 goto done;
626 }
627
628 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
629 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
630 if (copy_to_user((void __user *)arg,
631 (unsigned char *)twoints,
632 sizeof(twoints))) {
633 retval = -EFAULT;
634 goto done;
635 }
636
637 dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X",
638 usblp->minor, twoints[0], twoints[1]);
639 break;
640
641 case IOCNR_SOFT_RESET:
642 if (_IOC_DIR(cmd) != _IOC_NONE) {
643 retval = -EINVAL;
644 goto done;
645 }
646 retval = usblp_reset(usblp);
647 break;
648 default:
649 retval = -ENOTTY;
650 }
651 else /* old-style ioctl value */
652 switch (cmd) {
653
654 case LPGETSTATUS:
655 if ((retval = usblp_read_status(usblp, usblp->statusbuf))) {
656 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
678 done:
679 mutex_unlock(&usblp->mut);
680 return retval;
681 }
682
683 static 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
704 static 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
785 raise_submit:
786 raise_badaddr:
787 usb_unanchor_urb(writeurb);
788 usb_free_urb(writeurb);
789 raise_urb:
790 raise_wait:
791 collect_error: /* Out of raise sequence */
792 mutex_unlock(&usblp->wmut);
793 raise_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 */
802 static 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
840 done:
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 */
856 static 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
894 static 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 */
920 static 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
946 static 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 */
968 static 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
1000 raise_submit:
1001 usb_unanchor_urb(urb);
1002 usb_free_urb(urb);
1003 raise_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 */
1024 static 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
1036 static 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
1048 static char *usblp_devnode(struct device *dev, mode_t *mode)
1049 {
1050 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
1051 }
1052
1053 static 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
1060 static 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
1072 static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL);
1073
1074 static 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
1178 abort_intfdata:
1179 usb_set_intfdata(intf, NULL);
1180 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1181 abort:
1182 kfree(usblp->readbuf);
1183 kfree(usblp->statusbuf);
1184 kfree(usblp->device_id_string);
1185 kfree(usblp);
1186 abort_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 */
1209 static 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
1286 static 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. */
1312 static 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
1340 static 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
1368 static 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
1382 static 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
1392 static 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
1403 MODULE_DEVICE_TABLE(usb, usblp_ids);
1404
1405 static 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
1415 static int __init usblp_init(void)
1416 {
1417 return usb_register(&usblp_driver);
1418 }
1419
1420 static void __exit usblp_exit(void)
1421 {
1422 usb_deregister(&usblp_driver);
1423 }
1424
1425 module_init(usblp_init);
1426 module_exit(usblp_exit);
1427
1428 MODULE_AUTHOR(DRIVER_AUTHOR);
1429 MODULE_DESCRIPTION(DRIVER_DESC);
1430 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1431 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1432 MODULE_LICENSE("GPL");
Linux Btrfs Development