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Linux 4.2.1
[linux/fpc-iii.git] / drivers / usb / class / usblp.c
blobf38e875a3fb19d10e00773607c3d37fb7dd28b8d
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/slab.h>
56 #include <linux/lp.h>
57 #include <linux/mutex.h>
58 #undef DEBUG
59 #include <linux/usb.h>
60 #include <linux/ratelimit.h>
61
62 /*
63 * Version Information
64 */
65 #define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal"
66 #define DRIVER_DESC "USB Printer Device Class driver"
67
68 #define USBLP_BUF_SIZE 8192
69 #define USBLP_BUF_SIZE_IN 1024
70 #define USBLP_DEVICE_ID_SIZE 1024
71
72 /* ioctls: */
73 #define IOCNR_GET_DEVICE_ID 1
74 #define IOCNR_GET_PROTOCOLS 2
75 #define IOCNR_SET_PROTOCOL 3
76 #define IOCNR_HP_SET_CHANNEL 4
77 #define IOCNR_GET_BUS_ADDRESS 5
78 #define IOCNR_GET_VID_PID 6
79 #define IOCNR_SOFT_RESET 7
80 /* Get device_id string: */
81 #define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len)
82 /* The following ioctls were added for http://hpoj.sourceforge.net: */
83 /* Get two-int array:
84 * [0]=current protocol (1=7/1/1, 2=7/1/2, 3=7/1/3),
85 * [1]=supported protocol mask (mask&(1<<n)!=0 means 7/1/n supported): */
86 #define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
87 /* Set protocol (arg: 1=7/1/1, 2=7/1/2, 3=7/1/3): */
88 #define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0)
89 /* Set channel number (HP Vendor-specific command): */
90 #define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0)
91 /* Get two-int array: [0]=bus number, [1]=device address: */
92 #define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len)
93 /* Get two-int array: [0]=vendor ID, [1]=product ID: */
94 #define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len)
95 /* Perform class specific soft reset */
96 #define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0);
97
98 /*
99 * A DEVICE_ID string may include the printer's serial number.
100 * It should end with a semi-colon (';').
101 * An example from an HP 970C DeskJet printer is (this is one long string,
102 * with the serial number changed):
103 MFG:HEWLETT-PACKARD;MDL:DESKJET 970C;CMD:MLC,PCL,PML;CLASS:PRINTER;DESCRIPTION:Hewlett-Packard DeskJet 970C;SERN:US970CSEPROF;VSTATUS:$HB0$NC0,ff,DN,IDLE,CUT,K1,C0,DP,NR,KP000,CP027;VP:0800,FL,B0;VJ: ;
104 */
105
106 /*
107 * USB Printer Requests
108 */
109
110 #define USBLP_REQ_GET_ID 0x00
111 #define USBLP_REQ_GET_STATUS 0x01
112 #define USBLP_REQ_RESET 0x02
113 #define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST 0x00 /* HP Vendor-specific */
114
115 #define USBLP_MINORS 16
116 #define USBLP_MINOR_BASE 0
117
118 #define USBLP_CTL_TIMEOUT 5000 /* 5 seconds */
119
120 #define USBLP_FIRST_PROTOCOL 1
121 #define USBLP_LAST_PROTOCOL 3
122 #define USBLP_MAX_PROTOCOLS (USBLP_LAST_PROTOCOL+1)
123
124 /*
125 * some arbitrary status buffer size;
126 * need a status buffer that is allocated via kmalloc(), not on stack
127 */
128 #define STATUS_BUF_SIZE 8
129
130 /*
131 * Locks down the locking order:
132 * ->wmut locks wstatus.
133 * ->mut locks the whole usblp, except [rw]complete, and thus, by indirection,
134 * [rw]status. We only touch status when we know the side idle.
135 * ->lock locks what interrupt accesses.
136 */
137 struct usblp {
138 struct usb_device *dev; /* USB device */
139 struct mutex wmut;
140 struct mutex mut;
141 spinlock_t lock; /* locks rcomplete, wcomplete */
142 char *readbuf; /* read transfer_buffer */
143 char *statusbuf; /* status transfer_buffer */
144 struct usb_anchor urbs;
145 wait_queue_head_t rwait, wwait;
146 int readcount; /* Counter for reads */
147 int ifnum; /* Interface number */
148 struct usb_interface *intf; /* The interface */
149 /* Alternate-setting numbers and endpoints for each protocol
150 * (7/1/{index=1,2,3}) that the device supports: */
151 struct {
152 int alt_setting;
153 struct usb_endpoint_descriptor *epwrite;
154 struct usb_endpoint_descriptor *epread;
155 } protocol[USBLP_MAX_PROTOCOLS];
156 int current_protocol;
157 int minor; /* minor number of device */
158 int wcomplete, rcomplete;
159 int wstatus; /* bytes written or error */
160 int rstatus; /* bytes ready or error */
161 unsigned int quirks; /* quirks flags */
162 unsigned int flags; /* mode flags */
163 unsigned char used; /* True if open */
164 unsigned char present; /* True if not disconnected */
165 unsigned char bidir; /* interface is bidirectional */
166 unsigned char no_paper; /* Paper Out happened */
167 unsigned char *device_id_string; /* IEEE 1284 DEVICE ID string (ptr) */
168 /* first 2 bytes are (big-endian) length */
169 };
170
171 #ifdef DEBUG
172 static void usblp_dump(struct usblp *usblp)
173 {
174 struct device *dev = &usblp->intf->dev;
175 int p;
176
177 dev_dbg(dev, "usblp=0x%p\n", usblp);
178 dev_dbg(dev, "dev=0x%p\n", usblp->dev);
179 dev_dbg(dev, "present=%d\n", usblp->present);
180 dev_dbg(dev, "readbuf=0x%p\n", usblp->readbuf);
181 dev_dbg(dev, "readcount=%d\n", usblp->readcount);
182 dev_dbg(dev, "ifnum=%d\n", usblp->ifnum);
183 for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
184 dev_dbg(dev, "protocol[%d].alt_setting=%d\n", p,
185 usblp->protocol[p].alt_setting);
186 dev_dbg(dev, "protocol[%d].epwrite=%p\n", p,
187 usblp->protocol[p].epwrite);
188 dev_dbg(dev, "protocol[%d].epread=%p\n", p,
189 usblp->protocol[p].epread);
190 }
191 dev_dbg(dev, "current_protocol=%d\n", usblp->current_protocol);
192 dev_dbg(dev, "minor=%d\n", usblp->minor);
193 dev_dbg(dev, "wstatus=%d\n", usblp->wstatus);
194 dev_dbg(dev, "rstatus=%d\n", usblp->rstatus);
195 dev_dbg(dev, "quirks=%d\n", usblp->quirks);
196 dev_dbg(dev, "used=%d\n", usblp->used);
197 dev_dbg(dev, "bidir=%d\n", usblp->bidir);
198 dev_dbg(dev, "device_id_string=\"%s\"\n",
199 usblp->device_id_string ?
200 usblp->device_id_string + 2 :
201 (unsigned char *)"(null)");
202 }
203 #endif
204
205 /* Quirks: various printer quirks are handled by this table & its flags. */
206
207 struct quirk_printer_struct {
208 __u16 vendorId;
209 __u16 productId;
210 unsigned int quirks;
211 };
212
213 #define USBLP_QUIRK_BIDIR 0x1 /* reports bidir but requires unidirectional mode (no INs/reads) */
214 #define USBLP_QUIRK_USB_INIT 0x2 /* needs vendor USB init string */
215 #define USBLP_QUIRK_BAD_CLASS 0x4 /* descriptor uses vendor-specific Class or SubClass */
216
217 static const struct quirk_printer_struct quirk_printers[] = {
218 { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
219 { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
220 { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
221 { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
222 { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
223 { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
224 { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */
225 { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */
226 { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
227 { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
228 { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
229 { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
230 { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
231 { 0x0482, 0x0010, USBLP_QUIRK_BIDIR }, /* Kyocera Mita FS 820, by zut <kernel@zut.de> */
232 { 0x04f9, 0x000d, USBLP_QUIRK_BIDIR }, /* Brother Industries, Ltd HL-1440 Laser Printer */
233 { 0x04b8, 0x0202, USBLP_QUIRK_BAD_CLASS }, /* Seiko Epson Receipt Printer M129C */
234 { 0, 0 }
235 };
236
237 static int usblp_wwait(struct usblp *usblp, int nonblock);
238 static int usblp_wtest(struct usblp *usblp, int nonblock);
239 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock);
240 static int usblp_rtest(struct usblp *usblp, int nonblock);
241 static int usblp_submit_read(struct usblp *usblp);
242 static int usblp_select_alts(struct usblp *usblp);
243 static int usblp_set_protocol(struct usblp *usblp, int protocol);
244 static int usblp_cache_device_id_string(struct usblp *usblp);
245
246 /* forward reference to make our lives easier */
247 static struct usb_driver usblp_driver;
248 static DEFINE_MUTEX(usblp_mutex); /* locks the existence of usblp's */
249
250 /*
251 * Functions for usblp control messages.
252 */
253
254 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
255 {
256 int retval;
257 int index = usblp->ifnum;
258
259 /* High byte has the interface index.
260 Low byte has the alternate setting.
261 */
262 if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS))
263 index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
264
265 retval = usb_control_msg(usblp->dev,
266 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
267 request, type | dir | recip, value, index, buf, len, USBLP_CTL_TIMEOUT);
268 dev_dbg(&usblp->intf->dev,
269 "usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d\n",
270 request, !!dir, recip, value, index, len, retval);
271 return retval < 0 ? retval : 0;
272 }
273
274 #define usblp_read_status(usblp, status)\
275 usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
276 #define usblp_get_id(usblp, config, id, maxlen)\
277 usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
278 #define usblp_reset(usblp)\
279 usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
280
281 #define usblp_hp_channel_change_request(usblp, channel, buffer) \
282 usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
283
284 /*
285 * See the description for usblp_select_alts() below for the usage
286 * explanation. Look into your /proc/bus/usb/devices and dmesg in
287 * case of any trouble.
288 */
289 static int proto_bias = -1;
290
291 /*
292 * URB callback.
293 */
294
295 static void usblp_bulk_read(struct urb *urb)
296 {
297 struct usblp *usblp = urb->context;
298 int status = urb->status;
299
300 if (usblp->present && usblp->used) {
301 if (status)
302 printk(KERN_WARNING "usblp%d: "
303 "nonzero read bulk status received: %d\n",
304 usblp->minor, status);
305 }
306 spin_lock(&usblp->lock);
307 if (status < 0)
308 usblp->rstatus = status;
309 else
310 usblp->rstatus = urb->actual_length;
311 usblp->rcomplete = 1;
312 wake_up(&usblp->rwait);
313 spin_unlock(&usblp->lock);
314
315 usb_free_urb(urb);
316 }
317
318 static void usblp_bulk_write(struct urb *urb)
319 {
320 struct usblp *usblp = urb->context;
321 int status = urb->status;
322
323 if (usblp->present && usblp->used) {
324 if (status)
325 printk(KERN_WARNING "usblp%d: "
326 "nonzero write bulk status received: %d\n",
327 usblp->minor, status);
328 }
329 spin_lock(&usblp->lock);
330 if (status < 0)
331 usblp->wstatus = status;
332 else
333 usblp->wstatus = urb->actual_length;
334 usblp->no_paper = 0;
335 usblp->wcomplete = 1;
336 wake_up(&usblp->wwait);
337 spin_unlock(&usblp->lock);
338
339 usb_free_urb(urb);
340 }
341
342 /*
343 * Get and print printer errors.
344 */
345
346 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
347
348 static int usblp_check_status(struct usblp *usblp, int err)
349 {
350 unsigned char status, newerr = 0;
351 int error;
352
353 mutex_lock(&usblp->mut);
354 if ((error = usblp_read_status(usblp, usblp->statusbuf)) < 0) {
355 mutex_unlock(&usblp->mut);
356 printk_ratelimited(KERN_ERR
357 "usblp%d: error %d reading printer status\n",
358 usblp->minor, error);
359 return 0;
360 }
361 status = *usblp->statusbuf;
362 mutex_unlock(&usblp->mut);
363
364 if (~status & LP_PERRORP)
365 newerr = 3;
366 if (status & LP_POUTPA)
367 newerr = 1;
368 if (~status & LP_PSELECD)
369 newerr = 2;
370
371 if (newerr != err) {
372 printk(KERN_INFO "usblp%d: %s\n",
373 usblp->minor, usblp_messages[newerr]);
374 }
375
376 return newerr;
377 }
378
379 static int handle_bidir(struct usblp *usblp)
380 {
381 if (usblp->bidir && usblp->used) {
382 if (usblp_submit_read(usblp) < 0)
383 return -EIO;
384 }
385 return 0;
386 }
387
388 /*
389 * File op functions.
390 */
391
392 static int usblp_open(struct inode *inode, struct file *file)
393 {
394 int minor = iminor(inode);
395 struct usblp *usblp;
396 struct usb_interface *intf;
397 int retval;
398
399 if (minor < 0)
400 return -ENODEV;
401
402 mutex_lock(&usblp_mutex);
403
404 retval = -ENODEV;
405 intf = usb_find_interface(&usblp_driver, minor);
406 if (!intf)
407 goto out;
408 usblp = usb_get_intfdata(intf);
409 if (!usblp || !usblp->dev || !usblp->present)
410 goto out;
411
412 retval = -EBUSY;
413 if (usblp->used)
414 goto out;
415
416 /*
417 * We do not implement LP_ABORTOPEN/LPABORTOPEN for two reasons:
418 * - We do not want persistent state which close(2) does not clear
419 * - It is not used anyway, according to CUPS people
420 */
421
422 retval = usb_autopm_get_interface(intf);
423 if (retval < 0)
424 goto out;
425 usblp->used = 1;
426 file->private_data = usblp;
427
428 usblp->wcomplete = 1; /* we begin writeable */
429 usblp->wstatus = 0;
430 usblp->rcomplete = 0;
431
432 if (handle_bidir(usblp) < 0) {
433 usb_autopm_put_interface(intf);
434 usblp->used = 0;
435 file->private_data = NULL;
436 retval = -EIO;
437 }
438 out:
439 mutex_unlock(&usblp_mutex);
440 return retval;
441 }
442
443 static void usblp_cleanup(struct usblp *usblp)
444 {
445 printk(KERN_INFO "usblp%d: removed\n", usblp->minor);
446
447 kfree(usblp->readbuf);
448 kfree(usblp->device_id_string);
449 kfree(usblp->statusbuf);
450 kfree(usblp);
451 }
452
453 static void usblp_unlink_urbs(struct usblp *usblp)
454 {
455 usb_kill_anchored_urbs(&usblp->urbs);
456 }
457
458 static int usblp_release(struct inode *inode, struct file *file)
459 {
460 struct usblp *usblp = file->private_data;
461
462 usblp->flags &= ~LP_ABORT;
463
464 mutex_lock(&usblp_mutex);
465 usblp->used = 0;
466 if (usblp->present) {
467 usblp_unlink_urbs(usblp);
468 usb_autopm_put_interface(usblp->intf);
469 } else /* finish cleanup from disconnect */
470 usblp_cleanup(usblp);
471 mutex_unlock(&usblp_mutex);
472 return 0;
473 }
474
475 /* No kernel lock - fine */
476 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
477 {
478 int ret;
479 unsigned long flags;
480
481 struct usblp *usblp = file->private_data;
482 /* Should we check file->f_mode & FMODE_WRITE before poll_wait()? */
483 poll_wait(file, &usblp->rwait, wait);
484 poll_wait(file, &usblp->wwait, wait);
485 spin_lock_irqsave(&usblp->lock, flags);
486 ret = ((usblp->bidir && usblp->rcomplete) ? POLLIN | POLLRDNORM : 0) |
487 ((usblp->no_paper || usblp->wcomplete) ? POLLOUT | POLLWRNORM : 0);
488 spin_unlock_irqrestore(&usblp->lock, flags);
489 return ret;
490 }
491
492 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
493 {
494 struct usblp *usblp = file->private_data;
495 int length, err, i;
496 unsigned char newChannel;
497 int status;
498 int twoints[2];
499 int retval = 0;
500
501 mutex_lock(&usblp->mut);
502 if (!usblp->present) {
503 retval = -ENODEV;
504 goto done;
505 }
506
507 dev_dbg(&usblp->intf->dev,
508 "usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)\n", cmd,
509 _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd));
510
511 if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */
512
513 switch (_IOC_NR(cmd)) {
514
515 case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
516 if (_IOC_DIR(cmd) != _IOC_READ) {
517 retval = -EINVAL;
518 goto done;
519 }
520
521 length = usblp_cache_device_id_string(usblp);
522 if (length < 0) {
523 retval = length;
524 goto done;
525 }
526 if (length > _IOC_SIZE(cmd))
527 length = _IOC_SIZE(cmd); /* truncate */
528
529 if (copy_to_user((void __user *) arg,
530 usblp->device_id_string,
531 (unsigned long) length)) {
532 retval = -EFAULT;
533 goto done;
534 }
535
536 break;
537
538 case IOCNR_GET_PROTOCOLS:
539 if (_IOC_DIR(cmd) != _IOC_READ ||
540 _IOC_SIZE(cmd) < sizeof(twoints)) {
541 retval = -EINVAL;
542 goto done;
543 }
544
545 twoints[0] = usblp->current_protocol;
546 twoints[1] = 0;
547 for (i = USBLP_FIRST_PROTOCOL;
548 i <= USBLP_LAST_PROTOCOL; i++) {
549 if (usblp->protocol[i].alt_setting >= 0)
550 twoints[1] |= (1<<i);
551 }
552
553 if (copy_to_user((void __user *)arg,
554 (unsigned char *)twoints,
555 sizeof(twoints))) {
556 retval = -EFAULT;
557 goto done;
558 }
559
560 break;
561
562 case IOCNR_SET_PROTOCOL:
563 if (_IOC_DIR(cmd) != _IOC_WRITE) {
564 retval = -EINVAL;
565 goto done;
566 }
567
568 #ifdef DEBUG
569 if (arg == -10) {
570 usblp_dump(usblp);
571 break;
572 }
573 #endif
574
575 usblp_unlink_urbs(usblp);
576 retval = usblp_set_protocol(usblp, arg);
577 if (retval < 0) {
578 usblp_set_protocol(usblp,
579 usblp->current_protocol);
580 }
581 break;
582
583 case IOCNR_HP_SET_CHANNEL:
584 if (_IOC_DIR(cmd) != _IOC_WRITE ||
585 le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
586 usblp->quirks & USBLP_QUIRK_BIDIR) {
587 retval = -EINVAL;
588 goto done;
589 }
590
591 err = usblp_hp_channel_change_request(usblp,
592 arg, &newChannel);
593 if (err < 0) {
594 dev_err(&usblp->dev->dev,
595 "usblp%d: error = %d setting "
596 "HP channel\n",
597 usblp->minor, err);
598 retval = -EIO;
599 goto done;
600 }
601
602 dev_dbg(&usblp->intf->dev,
603 "usblp%d requested/got HP channel %ld/%d\n",
604 usblp->minor, arg, newChannel);
605 break;
606
607 case IOCNR_GET_BUS_ADDRESS:
608 if (_IOC_DIR(cmd) != _IOC_READ ||
609 _IOC_SIZE(cmd) < sizeof(twoints)) {
610 retval = -EINVAL;
611 goto done;
612 }
613
614 twoints[0] = usblp->dev->bus->busnum;
615 twoints[1] = usblp->dev->devnum;
616 if (copy_to_user((void __user *)arg,
617 (unsigned char *)twoints,
618 sizeof(twoints))) {
619 retval = -EFAULT;
620 goto done;
621 }
622
623 dev_dbg(&usblp->intf->dev,
624 "usblp%d is bus=%d, device=%d\n",
625 usblp->minor, twoints[0], twoints[1]);
626 break;
627
628 case IOCNR_GET_VID_PID:
629 if (_IOC_DIR(cmd) != _IOC_READ ||
630 _IOC_SIZE(cmd) < sizeof(twoints)) {
631 retval = -EINVAL;
632 goto done;
633 }
634
635 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
636 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
637 if (copy_to_user((void __user *)arg,
638 (unsigned char *)twoints,
639 sizeof(twoints))) {
640 retval = -EFAULT;
641 goto done;
642 }
643
644 dev_dbg(&usblp->intf->dev,
645 "usblp%d is VID=0x%4.4X, PID=0x%4.4X\n",
646 usblp->minor, twoints[0], twoints[1]);
647 break;
648
649 case IOCNR_SOFT_RESET:
650 if (_IOC_DIR(cmd) != _IOC_NONE) {
651 retval = -EINVAL;
652 goto done;
653 }
654 retval = usblp_reset(usblp);
655 break;
656 default:
657 retval = -ENOTTY;
658 }
659 else /* old-style ioctl value */
660 switch (cmd) {
661
662 case LPGETSTATUS:
663 retval = usblp_read_status(usblp, usblp->statusbuf);
664 if (retval) {
665 printk_ratelimited(KERN_ERR "usblp%d:"
666 "failed reading printer status (%d)\n",
667 usblp->minor, retval);
668 retval = -EIO;
669 goto done;
670 }
671 status = *usblp->statusbuf;
672 if (copy_to_user((void __user *)arg, &status, sizeof(int)))
673 retval = -EFAULT;
674 break;
675
676 case LPABORT:
677 if (arg)
678 usblp->flags |= LP_ABORT;
679 else
680 usblp->flags &= ~LP_ABORT;
681 break;
682
683 default:
684 retval = -ENOTTY;
685 }
686
687 done:
688 mutex_unlock(&usblp->mut);
689 return retval;
690 }
691
692 static struct urb *usblp_new_writeurb(struct usblp *usblp, int transfer_length)
693 {
694 struct urb *urb;
695 char *writebuf;
696
697 writebuf = kmalloc(transfer_length, GFP_KERNEL);
698 if (writebuf == NULL)
699 return NULL;
700 urb = usb_alloc_urb(0, GFP_KERNEL);
701 if (urb == NULL) {
702 kfree(writebuf);
703 return NULL;
704 }
705
706 usb_fill_bulk_urb(urb, usblp->dev,
707 usb_sndbulkpipe(usblp->dev,
708 usblp->protocol[usblp->current_protocol].epwrite->bEndpointAddress),
709 writebuf, transfer_length, usblp_bulk_write, usblp);
710 urb->transfer_flags |= URB_FREE_BUFFER;
711
712 return urb;
713 }
714
715 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
716 {
717 struct usblp *usblp = file->private_data;
718 struct urb *writeurb;
719 int rv;
720 int transfer_length;
721 ssize_t writecount = 0;
722
723 if (mutex_lock_interruptible(&usblp->wmut)) {
724 rv = -EINTR;
725 goto raise_biglock;
726 }
727 if ((rv = usblp_wwait(usblp, !!(file->f_flags & O_NONBLOCK))) < 0)
728 goto raise_wait;
729
730 while (writecount < count) {
731 /*
732 * Step 1: Submit next block.
733 */
734 if ((transfer_length = count - writecount) > USBLP_BUF_SIZE)
735 transfer_length = USBLP_BUF_SIZE;
736
737 rv = -ENOMEM;
738 writeurb = usblp_new_writeurb(usblp, transfer_length);
739 if (writeurb == NULL)
740 goto raise_urb;
741 usb_anchor_urb(writeurb, &usblp->urbs);
742
743 if (copy_from_user(writeurb->transfer_buffer,
744 buffer + writecount, transfer_length)) {
745 rv = -EFAULT;
746 goto raise_badaddr;
747 }
748
749 spin_lock_irq(&usblp->lock);
750 usblp->wcomplete = 0;
751 spin_unlock_irq(&usblp->lock);
752 if ((rv = usb_submit_urb(writeurb, GFP_KERNEL)) < 0) {
753 usblp->wstatus = 0;
754 spin_lock_irq(&usblp->lock);
755 usblp->no_paper = 0;
756 usblp->wcomplete = 1;
757 wake_up(&usblp->wwait);
758 spin_unlock_irq(&usblp->lock);
759 if (rv != -ENOMEM)
760 rv = -EIO;
761 goto raise_submit;
762 }
763
764 /*
765 * Step 2: Wait for transfer to end, collect results.
766 */
767 rv = usblp_wwait(usblp, !!(file->f_flags&O_NONBLOCK));
768 if (rv < 0) {
769 if (rv == -EAGAIN) {
770 /* Presume that it's going to complete well. */
771 writecount += transfer_length;
772 }
773 if (rv == -ENOSPC) {
774 spin_lock_irq(&usblp->lock);
775 usblp->no_paper = 1; /* Mark for poll(2) */
776 spin_unlock_irq(&usblp->lock);
777 writecount += transfer_length;
778 }
779 /* Leave URB dangling, to be cleaned on close. */
780 goto collect_error;
781 }
782
783 if (usblp->wstatus < 0) {
784 rv = -EIO;
785 goto collect_error;
786 }
787 /*
788 * This is critical: it must be our URB, not other writer's.
789 * The wmut exists mainly to cover us here.
790 */
791 writecount += usblp->wstatus;
792 }
793
794 mutex_unlock(&usblp->wmut);
795 return writecount;
796
797 raise_submit:
798 raise_badaddr:
799 usb_unanchor_urb(writeurb);
800 usb_free_urb(writeurb);
801 raise_urb:
802 raise_wait:
803 collect_error: /* Out of raise sequence */
804 mutex_unlock(&usblp->wmut);
805 raise_biglock:
806 return writecount ? writecount : rv;
807 }
808
809 /*
810 * Notice that we fail to restart in a few cases: on EFAULT, on restart
811 * error, etc. This is the historical behaviour. In all such cases we return
812 * EIO, and applications loop in order to get the new read going.
813 */
814 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t len, loff_t *ppos)
815 {
816 struct usblp *usblp = file->private_data;
817 ssize_t count;
818 ssize_t avail;
819 int rv;
820
821 if (!usblp->bidir)
822 return -EINVAL;
823
824 rv = usblp_rwait_and_lock(usblp, !!(file->f_flags & O_NONBLOCK));
825 if (rv < 0)
826 return rv;
827
828 if ((avail = usblp->rstatus) < 0) {
829 printk(KERN_ERR "usblp%d: error %d reading from printer\n",
830 usblp->minor, (int)avail);
831 usblp_submit_read(usblp);
832 count = -EIO;
833 goto done;
834 }
835
836 count = len < avail - usblp->readcount ? len : avail - usblp->readcount;
837 if (count != 0 &&
838 copy_to_user(buffer, usblp->readbuf + usblp->readcount, count)) {
839 count = -EFAULT;
840 goto done;
841 }
842
843 if ((usblp->readcount += count) == avail) {
844 if (usblp_submit_read(usblp) < 0) {
845 /* We don't want to leak USB return codes into errno. */
846 if (count == 0)
847 count = -EIO;
848 goto done;
849 }
850 }
851
852 done:
853 mutex_unlock(&usblp->mut);
854 return count;
855 }
856
857 /*
858 * Wait for the write path to come idle.
859 * This is called under the ->wmut, so the idle path stays idle.
860 *
861 * Our write path has a peculiar property: it does not buffer like a tty,
862 * but waits for the write to succeed. This allows our ->release to bug out
863 * without waiting for writes to drain. But it obviously does not work
864 * when O_NONBLOCK is set. So, applications setting O_NONBLOCK must use
865 * select(2) or poll(2) to wait for the buffer to drain before closing.
866 * Alternatively, set blocking mode with fcntl and issue a zero-size write.
867 */
868 static int usblp_wwait(struct usblp *usblp, int nonblock)
869 {
870 DECLARE_WAITQUEUE(waita, current);
871 int rc;
872 int err = 0;
873
874 add_wait_queue(&usblp->wwait, &waita);
875 for (;;) {
876 set_current_state(TASK_INTERRUPTIBLE);
877 if (mutex_lock_interruptible(&usblp->mut)) {
878 rc = -EINTR;
879 break;
880 }
881 rc = usblp_wtest(usblp, nonblock);
882 mutex_unlock(&usblp->mut);
883 if (rc <= 0)
884 break;
885
886 if (schedule_timeout(msecs_to_jiffies(1500)) == 0) {
887 if (usblp->flags & LP_ABORT) {
888 err = usblp_check_status(usblp, err);
889 if (err == 1) { /* Paper out */
890 rc = -ENOSPC;
891 break;
892 }
893 } else {
894 /* Prod the printer, Gentoo#251237. */
895 mutex_lock(&usblp->mut);
896 usblp_read_status(usblp, usblp->statusbuf);
897 mutex_unlock(&usblp->mut);
898 }
899 }
900 }
901 set_current_state(TASK_RUNNING);
902 remove_wait_queue(&usblp->wwait, &waita);
903 return rc;
904 }
905
906 static int usblp_wtest(struct usblp *usblp, int nonblock)
907 {
908 unsigned long flags;
909
910 if (!usblp->present)
911 return -ENODEV;
912 if (signal_pending(current))
913 return -EINTR;
914 spin_lock_irqsave(&usblp->lock, flags);
915 if (usblp->wcomplete) {
916 spin_unlock_irqrestore(&usblp->lock, flags);
917 return 0;
918 }
919 spin_unlock_irqrestore(&usblp->lock, flags);
920 if (nonblock)
921 return -EAGAIN;
922 return 1;
923 }
924
925 /*
926 * Wait for read bytes to become available. This probably should have been
927 * called usblp_r_lock_and_wait(), because we lock first. But it's a traditional
928 * name for functions which lock and return.
929 *
930 * We do not use wait_event_interruptible because it makes locking iffy.
931 */
932 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock)
933 {
934 DECLARE_WAITQUEUE(waita, current);
935 int rc;
936
937 add_wait_queue(&usblp->rwait, &waita);
938 for (;;) {
939 if (mutex_lock_interruptible(&usblp->mut)) {
940 rc = -EINTR;
941 break;
942 }
943 set_current_state(TASK_INTERRUPTIBLE);
944 if ((rc = usblp_rtest(usblp, nonblock)) < 0) {
945 mutex_unlock(&usblp->mut);
946 break;
947 }
948 if (rc == 0) /* Keep it locked */
949 break;
950 mutex_unlock(&usblp->mut);
951 schedule();
952 }
953 set_current_state(TASK_RUNNING);
954 remove_wait_queue(&usblp->rwait, &waita);
955 return rc;
956 }
957
958 static int usblp_rtest(struct usblp *usblp, int nonblock)
959 {
960 unsigned long flags;
961
962 if (!usblp->present)
963 return -ENODEV;
964 if (signal_pending(current))
965 return -EINTR;
966 spin_lock_irqsave(&usblp->lock, flags);
967 if (usblp->rcomplete) {
968 spin_unlock_irqrestore(&usblp->lock, flags);
969 return 0;
970 }
971 spin_unlock_irqrestore(&usblp->lock, flags);
972 if (nonblock)
973 return -EAGAIN;
974 return 1;
975 }
976
977 /*
978 * Please check ->bidir and other such things outside for now.
979 */
980 static int usblp_submit_read(struct usblp *usblp)
981 {
982 struct urb *urb;
983 unsigned long flags;
984 int rc;
985
986 rc = -ENOMEM;
987 urb = usb_alloc_urb(0, GFP_KERNEL);
988 if (urb == NULL)
989 goto raise_urb;
990
991 usb_fill_bulk_urb(urb, usblp->dev,
992 usb_rcvbulkpipe(usblp->dev,
993 usblp->protocol[usblp->current_protocol].epread->bEndpointAddress),
994 usblp->readbuf, USBLP_BUF_SIZE_IN,
995 usblp_bulk_read, usblp);
996 usb_anchor_urb(urb, &usblp->urbs);
997
998 spin_lock_irqsave(&usblp->lock, flags);
999 usblp->readcount = 0; /* XXX Why here? */
1000 usblp->rcomplete = 0;
1001 spin_unlock_irqrestore(&usblp->lock, flags);
1002 if ((rc = usb_submit_urb(urb, GFP_KERNEL)) < 0) {
1003 dev_dbg(&usblp->intf->dev, "error submitting urb (%d)\n", rc);
1004 spin_lock_irqsave(&usblp->lock, flags);
1005 usblp->rstatus = rc;
1006 usblp->rcomplete = 1;
1007 spin_unlock_irqrestore(&usblp->lock, flags);
1008 goto raise_submit;
1009 }
1010
1011 return 0;
1012
1013 raise_submit:
1014 usb_unanchor_urb(urb);
1015 usb_free_urb(urb);
1016 raise_urb:
1017 return rc;
1018 }
1019
1020 /*
1021 * Checks for printers that have quirks, such as requiring unidirectional
1022 * communication but reporting bidirectional; currently some HP printers
1023 * have this flaw (HP 810, 880, 895, etc.), or needing an init string
1024 * sent at each open (like some Epsons).
1025 * Returns 1 if found, 0 if not found.
1026 *
1027 * HP recommended that we use the bidirectional interface but
1028 * don't attempt any bulk IN transfers from the IN endpoint.
1029 * Here's some more detail on the problem:
1030 * The problem is not that it isn't bidirectional though. The problem
1031 * is that if you request a device ID, or status information, while
1032 * the buffers are full, the return data will end up in the print data
1033 * buffer. For example if you make sure you never request the device ID
1034 * while you are sending print data, and you don't try to query the
1035 * printer status every couple of milliseconds, you will probably be OK.
1036 */
1037 static unsigned int usblp_quirks(__u16 vendor, __u16 product)
1038 {
1039 int i;
1040
1041 for (i = 0; quirk_printers[i].vendorId; i++) {
1042 if (vendor == quirk_printers[i].vendorId &&
1043 product == quirk_printers[i].productId)
1044 return quirk_printers[i].quirks;
1045 }
1046 return 0;
1047 }
1048
1049 static const struct file_operations usblp_fops = {
1050 .owner = THIS_MODULE,
1051 .read = usblp_read,
1052 .write = usblp_write,
1053 .poll = usblp_poll,
1054 .unlocked_ioctl = usblp_ioctl,
1055 .compat_ioctl = usblp_ioctl,
1056 .open = usblp_open,
1057 .release = usblp_release,
1058 .llseek = noop_llseek,
1059 };
1060
1061 static char *usblp_devnode(struct device *dev, umode_t *mode)
1062 {
1063 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
1064 }
1065
1066 static struct usb_class_driver usblp_class = {
1067 .name = "lp%d",
1068 .devnode = usblp_devnode,
1069 .fops = &usblp_fops,
1070 .minor_base = USBLP_MINOR_BASE,
1071 };
1072
1073 static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf)
1074 {
1075 struct usb_interface *intf = to_usb_interface(dev);
1076 struct usblp *usblp = usb_get_intfdata(intf);
1077
1078 if (usblp->device_id_string[0] == 0 &&
1079 usblp->device_id_string[1] == 0)
1080 return 0;
1081
1082 return sprintf(buf, "%s", usblp->device_id_string+2);
1083 }
1084
1085 static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL);
1086
1087 static int usblp_probe(struct usb_interface *intf,
1088 const struct usb_device_id *id)
1089 {
1090 struct usb_device *dev = interface_to_usbdev(intf);
1091 struct usblp *usblp;
1092 int protocol;
1093 int retval;
1094
1095 /* Malloc and start initializing usblp structure so we can use it
1096 * directly. */
1097 usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL);
1098 if (!usblp) {
1099 retval = -ENOMEM;
1100 goto abort_ret;
1101 }
1102 usblp->dev = dev;
1103 mutex_init(&usblp->wmut);
1104 mutex_init(&usblp->mut);
1105 spin_lock_init(&usblp->lock);
1106 init_waitqueue_head(&usblp->rwait);
1107 init_waitqueue_head(&usblp->wwait);
1108 init_usb_anchor(&usblp->urbs);
1109 usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
1110 usblp->intf = intf;
1111
1112 /* Malloc device ID string buffer to the largest expected length,
1113 * since we can re-query it on an ioctl and a dynamic string
1114 * could change in length. */
1115 if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
1116 retval = -ENOMEM;
1117 goto abort;
1118 }
1119
1120 /*
1121 * Allocate read buffer. We somewhat wastefully
1122 * malloc both regardless of bidirectionality, because the
1123 * alternate setting can be changed later via an ioctl.
1124 */
1125 if (!(usblp->readbuf = kmalloc(USBLP_BUF_SIZE_IN, GFP_KERNEL))) {
1126 retval = -ENOMEM;
1127 goto abort;
1128 }
1129
1130 /* Allocate buffer for printer status */
1131 usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
1132 if (!usblp->statusbuf) {
1133 retval = -ENOMEM;
1134 goto abort;
1135 }
1136
1137 /* Lookup quirks for this printer. */
1138 usblp->quirks = usblp_quirks(
1139 le16_to_cpu(dev->descriptor.idVendor),
1140 le16_to_cpu(dev->descriptor.idProduct));
1141
1142 /* Analyze and pick initial alternate settings and endpoints. */
1143 protocol = usblp_select_alts(usblp);
1144 if (protocol < 0) {
1145 dev_dbg(&intf->dev,
1146 "incompatible printer-class device 0x%4.4X/0x%4.4X\n",
1147 le16_to_cpu(dev->descriptor.idVendor),
1148 le16_to_cpu(dev->descriptor.idProduct));
1149 retval = -ENODEV;
1150 goto abort;
1151 }
1152
1153 /* Setup the selected alternate setting and endpoints. */
1154 if (usblp_set_protocol(usblp, protocol) < 0) {
1155 retval = -ENODEV; /* ->probe isn't ->ioctl */
1156 goto abort;
1157 }
1158
1159 /* Retrieve and store the device ID string. */
1160 usblp_cache_device_id_string(usblp);
1161 retval = device_create_file(&intf->dev, &dev_attr_ieee1284_id);
1162 if (retval)
1163 goto abort_intfdata;
1164
1165 #ifdef DEBUG
1166 usblp_check_status(usblp, 0);
1167 #endif
1168
1169 usb_set_intfdata(intf, usblp);
1170
1171 usblp->present = 1;
1172
1173 retval = usb_register_dev(intf, &usblp_class);
1174 if (retval) {
1175 dev_err(&intf->dev,
1176 "usblp: Not able to get a minor (base %u, slice default): %d\n",
1177 USBLP_MINOR_BASE, retval);
1178 goto abort_intfdata;
1179 }
1180 usblp->minor = intf->minor;
1181 dev_info(&intf->dev,
1182 "usblp%d: USB %sdirectional printer dev %d if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X\n",
1183 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
1184 usblp->ifnum,
1185 usblp->protocol[usblp->current_protocol].alt_setting,
1186 usblp->current_protocol,
1187 le16_to_cpu(usblp->dev->descriptor.idVendor),
1188 le16_to_cpu(usblp->dev->descriptor.idProduct));
1189
1190 return 0;
1191
1192 abort_intfdata:
1193 usb_set_intfdata(intf, NULL);
1194 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1195 abort:
1196 kfree(usblp->readbuf);
1197 kfree(usblp->statusbuf);
1198 kfree(usblp->device_id_string);
1199 kfree(usblp);
1200 abort_ret:
1201 return retval;
1202 }
1203
1204 /*
1205 * We are a "new" style driver with usb_device_id table,
1206 * but our requirements are too intricate for simple match to handle.
1207 *
1208 * The "proto_bias" option may be used to specify the preferred protocol
1209 * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3). If the device
1210 * supports the preferred protocol, then we bind to it.
1211 *
1212 * The best interface for us is 7/1/2, because it is compatible
1213 * with a stream of characters. If we find it, we bind to it.
1214 *
1215 * Note that the people from hpoj.sourceforge.net need to be able to
1216 * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
1217 *
1218 * Failing 7/1/2, we look for 7/1/3, even though it's probably not
1219 * stream-compatible, because this matches the behaviour of the old code.
1220 *
1221 * If nothing else, we bind to 7/1/1 - the unidirectional interface.
1222 */
1223 static int usblp_select_alts(struct usblp *usblp)
1224 {
1225 struct usb_interface *if_alt;
1226 struct usb_host_interface *ifd;
1227 struct usb_endpoint_descriptor *epd, *epwrite, *epread;
1228 int p, i, e;
1229
1230 if_alt = usblp->intf;
1231
1232 for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1233 usblp->protocol[p].alt_setting = -1;
1234
1235 /* Find out what we have. */
1236 for (i = 0; i < if_alt->num_altsetting; i++) {
1237 ifd = &if_alt->altsetting[i];
1238
1239 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
1240 if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS))
1241 continue;
1242
1243 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1244 ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1245 continue;
1246
1247 /* Look for bulk OUT and IN endpoints. */
1248 epwrite = epread = NULL;
1249 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1250 epd = &ifd->endpoint[e].desc;
1251
1252 if (usb_endpoint_is_bulk_out(epd))
1253 if (!epwrite)
1254 epwrite = epd;
1255
1256 if (usb_endpoint_is_bulk_in(epd))
1257 if (!epread)
1258 epread = epd;
1259 }
1260
1261 /* Ignore buggy hardware without the right endpoints. */
1262 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1263 continue;
1264
1265 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1266 * and buggy bidirectional printers. */
1267 if (ifd->desc.bInterfaceProtocol == 1) {
1268 epread = NULL;
1269 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1270 printk(KERN_INFO "usblp%d: Disabling reads from "
1271 "problematic bidirectional printer\n",
1272 usblp->minor);
1273 epread = NULL;
1274 }
1275
1276 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1277 ifd->desc.bAlternateSetting;
1278 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1279 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1280 }
1281
1282 /* If our requested protocol is supported, then use it. */
1283 if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1284 proto_bias <= USBLP_LAST_PROTOCOL &&
1285 usblp->protocol[proto_bias].alt_setting != -1)
1286 return proto_bias;
1287
1288 /* Ordering is important here. */
1289 if (usblp->protocol[2].alt_setting != -1)
1290 return 2;
1291 if (usblp->protocol[1].alt_setting != -1)
1292 return 1;
1293 if (usblp->protocol[3].alt_setting != -1)
1294 return 3;
1295
1296 /* If nothing is available, then don't bind to this device. */
1297 return -1;
1298 }
1299
1300 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1301 {
1302 int r, alts;
1303
1304 if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1305 return -EINVAL;
1306
1307 alts = usblp->protocol[protocol].alt_setting;
1308 if (alts < 0)
1309 return -EINVAL;
1310 r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1311 if (r < 0) {
1312 printk(KERN_ERR "usblp: can't set desired altsetting %d on interface %d\n",
1313 alts, usblp->ifnum);
1314 return r;
1315 }
1316
1317 usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1318 usblp->current_protocol = protocol;
1319 dev_dbg(&usblp->intf->dev, "usblp%d set protocol %d\n",
1320 usblp->minor, protocol);
1321 return 0;
1322 }
1323
1324 /* Retrieves and caches device ID string.
1325 * Returns length, including length bytes but not null terminator.
1326 * On error, returns a negative errno value. */
1327 static int usblp_cache_device_id_string(struct usblp *usblp)
1328 {
1329 int err, length;
1330
1331 err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1332 if (err < 0) {
1333 dev_dbg(&usblp->intf->dev,
1334 "usblp%d: error = %d reading IEEE-1284 Device ID string\n",
1335 usblp->minor, err);
1336 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1337 return -EIO;
1338 }
1339
1340 /* First two bytes are length in big-endian.
1341 * They count themselves, and we copy them into
1342 * the user's buffer. */
1343 length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1344 if (length < 2)
1345 length = 2;
1346 else if (length >= USBLP_DEVICE_ID_SIZE)
1347 length = USBLP_DEVICE_ID_SIZE - 1;
1348 usblp->device_id_string[length] = '\0';
1349
1350 dev_dbg(&usblp->intf->dev, "usblp%d Device ID string [len=%d]=\"%s\"\n",
1351 usblp->minor, length, &usblp->device_id_string[2]);
1352
1353 return length;
1354 }
1355
1356 static void usblp_disconnect(struct usb_interface *intf)
1357 {
1358 struct usblp *usblp = usb_get_intfdata(intf);
1359
1360 usb_deregister_dev(intf, &usblp_class);
1361
1362 if (!usblp || !usblp->dev) {
1363 dev_err(&intf->dev, "bogus disconnect\n");
1364 BUG();
1365 }
1366
1367 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
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
1384 static 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
1398 static 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
1408 static const struct usb_device_id usblp_ids[] = {
1409 { USB_DEVICE_INFO(7, 1, 1) },
1410 { USB_DEVICE_INFO(7, 1, 2) },
1411 { USB_DEVICE_INFO(7, 1, 3) },
1412 { USB_INTERFACE_INFO(7, 1, 1) },
1413 { USB_INTERFACE_INFO(7, 1, 2) },
1414 { USB_INTERFACE_INFO(7, 1, 3) },
1415 { USB_DEVICE(0x04b8, 0x0202) }, /* Seiko Epson Receipt Printer M129C */
1416 { } /* Terminating entry */
1417 };
1418
1419 MODULE_DEVICE_TABLE(usb, usblp_ids);
1420
1421 static 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 .supports_autosuspend = 1,
1429 };
1430
1431 module_usb_driver(usblp_driver);
1432
1433 MODULE_AUTHOR(DRIVER_AUTHOR);
1434 MODULE_DESCRIPTION(DRIVER_DESC);
1435 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1436 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1437 MODULE_LICENSE("GPL");
Linux with added FPC-III support