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Merge remote-tracking branch 'asoc/topic/tegra' into asoc-next
[deliverable/linux.git] / drivers / usb / class / usblp.c
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 struct device *dev = &usblp->intf->dev;
176 int p;
177
178 dev_dbg(dev, "usblp=0x%p\n", usblp);
179 dev_dbg(dev, "dev=0x%p\n", usblp->dev);
180 dev_dbg(dev, "present=%d\n", usblp->present);
181 dev_dbg(dev, "readbuf=0x%p\n", usblp->readbuf);
182 dev_dbg(dev, "readcount=%d\n", usblp->readcount);
183 dev_dbg(dev, "ifnum=%d\n", usblp->ifnum);
184 for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
185 dev_dbg(dev, "protocol[%d].alt_setting=%d\n", p,
186 usblp->protocol[p].alt_setting);
187 dev_dbg(dev, "protocol[%d].epwrite=%p\n", p,
188 usblp->protocol[p].epwrite);
189 dev_dbg(dev, "protocol[%d].epread=%p\n", p,
190 usblp->protocol[p].epread);
191 }
192 dev_dbg(dev, "current_protocol=%d\n", usblp->current_protocol);
193 dev_dbg(dev, "minor=%d\n", usblp->minor);
194 dev_dbg(dev, "wstatus=%d\n", usblp->wstatus);
195 dev_dbg(dev, "rstatus=%d\n", usblp->rstatus);
196 dev_dbg(dev, "quirks=%d\n", usblp->quirks);
197 dev_dbg(dev, "used=%d\n", usblp->used);
198 dev_dbg(dev, "bidir=%d\n", usblp->bidir);
199 dev_dbg(dev, "device_id_string=\"%s\"\n",
200 usblp->device_id_string ?
201 usblp->device_id_string + 2 :
202 (unsigned char *)"(null)");
203 }
204 #endif
205
206 /* Quirks: various printer quirks are handled by this table & its flags. */
207
208 struct quirk_printer_struct {
209 __u16 vendorId;
210 __u16 productId;
211 unsigned int quirks;
212 };
213
214 #define USBLP_QUIRK_BIDIR 0x1 /* reports bidir but requires unidirectional mode (no INs/reads) */
215 #define USBLP_QUIRK_USB_INIT 0x2 /* needs vendor USB init string */
216 #define USBLP_QUIRK_BAD_CLASS 0x4 /* descriptor uses vendor-specific Class or SubClass */
217
218 static const struct quirk_printer_struct quirk_printers[] = {
219 { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
220 { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
221 { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
222 { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
223 { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
224 { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
225 { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */
226 { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */
227 { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
228 { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
229 { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
230 { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
231 { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
232 { 0x0482, 0x0010, USBLP_QUIRK_BIDIR }, /* Kyocera Mita FS 820, by zut <kernel@zut.de> */
233 { 0x04f9, 0x000d, USBLP_QUIRK_BIDIR }, /* Brother Industries, Ltd HL-1440 Laser Printer */
234 { 0x04b8, 0x0202, USBLP_QUIRK_BAD_CLASS }, /* Seiko Epson Receipt Printer M129C */
235 { 0, 0 }
236 };
237
238 static int usblp_wwait(struct usblp *usblp, int nonblock);
239 static int usblp_wtest(struct usblp *usblp, int nonblock);
240 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock);
241 static int usblp_rtest(struct usblp *usblp, int nonblock);
242 static int usblp_submit_read(struct usblp *usblp);
243 static int usblp_select_alts(struct usblp *usblp);
244 static int usblp_set_protocol(struct usblp *usblp, int protocol);
245 static int usblp_cache_device_id_string(struct usblp *usblp);
246
247 /* forward reference to make our lives easier */
248 static struct usb_driver usblp_driver;
249 static DEFINE_MUTEX(usblp_mutex); /* locks the existence of usblp's */
250
251 /*
252 * Functions for usblp control messages.
253 */
254
255 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
256 {
257 int retval;
258 int index = usblp->ifnum;
259
260 /* High byte has the interface index.
261 Low byte has the alternate setting.
262 */
263 if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS))
264 index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
265
266 retval = usb_control_msg(usblp->dev,
267 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
268 request, type | dir | recip, value, index, buf, len, USBLP_CTL_TIMEOUT);
269 dev_dbg(&usblp->intf->dev,
270 "usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d\n",
271 request, !!dir, recip, value, index, len, retval);
272 return retval < 0 ? retval : 0;
273 }
274
275 #define usblp_read_status(usblp, status)\
276 usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
277 #define usblp_get_id(usblp, config, id, maxlen)\
278 usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
279 #define usblp_reset(usblp)\
280 usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
281
282 #define usblp_hp_channel_change_request(usblp, channel, buffer) \
283 usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
284
285 /*
286 * See the description for usblp_select_alts() below for the usage
287 * explanation. Look into your /proc/bus/usb/devices and dmesg in
288 * case of any trouble.
289 */
290 static int proto_bias = -1;
291
292 /*
293 * URB callback.
294 */
295
296 static void usblp_bulk_read(struct urb *urb)
297 {
298 struct usblp *usblp = urb->context;
299 int status = urb->status;
300
301 if (usblp->present && usblp->used) {
302 if (status)
303 printk(KERN_WARNING "usblp%d: "
304 "nonzero read bulk status received: %d\n",
305 usblp->minor, status);
306 }
307 spin_lock(&usblp->lock);
308 if (status < 0)
309 usblp->rstatus = status;
310 else
311 usblp->rstatus = urb->actual_length;
312 usblp->rcomplete = 1;
313 wake_up(&usblp->rwait);
314 spin_unlock(&usblp->lock);
315
316 usb_free_urb(urb);
317 }
318
319 static void usblp_bulk_write(struct urb *urb)
320 {
321 struct usblp *usblp = urb->context;
322 int status = urb->status;
323
324 if (usblp->present && usblp->used) {
325 if (status)
326 printk(KERN_WARNING "usblp%d: "
327 "nonzero write bulk status received: %d\n",
328 usblp->minor, status);
329 }
330 spin_lock(&usblp->lock);
331 if (status < 0)
332 usblp->wstatus = status;
333 else
334 usblp->wstatus = urb->actual_length;
335 usblp->no_paper = 0;
336 usblp->wcomplete = 1;
337 wake_up(&usblp->wwait);
338 spin_unlock(&usblp->lock);
339
340 usb_free_urb(urb);
341 }
342
343 /*
344 * Get and print printer errors.
345 */
346
347 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
348
349 static int usblp_check_status(struct usblp *usblp, int err)
350 {
351 unsigned char status, newerr = 0;
352 int error;
353
354 mutex_lock(&usblp->mut);
355 if ((error = usblp_read_status(usblp, usblp->statusbuf)) < 0) {
356 mutex_unlock(&usblp->mut);
357 printk_ratelimited(KERN_ERR
358 "usblp%d: error %d reading printer status\n",
359 usblp->minor, error);
360 return 0;
361 }
362 status = *usblp->statusbuf;
363 mutex_unlock(&usblp->mut);
364
365 if (~status & LP_PERRORP)
366 newerr = 3;
367 if (status & LP_POUTPA)
368 newerr = 1;
369 if (~status & LP_PSELECD)
370 newerr = 2;
371
372 if (newerr != err) {
373 printk(KERN_INFO "usblp%d: %s\n",
374 usblp->minor, usblp_messages[newerr]);
375 }
376
377 return newerr;
378 }
379
380 static int handle_bidir(struct usblp *usblp)
381 {
382 if (usblp->bidir && usblp->used) {
383 if (usblp_submit_read(usblp) < 0)
384 return -EIO;
385 }
386 return 0;
387 }
388
389 /*
390 * File op functions.
391 */
392
393 static int usblp_open(struct inode *inode, struct file *file)
394 {
395 int minor = iminor(inode);
396 struct usblp *usblp;
397 struct usb_interface *intf;
398 int retval;
399
400 if (minor < 0)
401 return -ENODEV;
402
403 mutex_lock(&usblp_mutex);
404
405 retval = -ENODEV;
406 intf = usb_find_interface(&usblp_driver, minor);
407 if (!intf)
408 goto out;
409 usblp = usb_get_intfdata(intf);
410 if (!usblp || !usblp->dev || !usblp->present)
411 goto out;
412
413 retval = -EBUSY;
414 if (usblp->used)
415 goto out;
416
417 /*
418 * We do not implement LP_ABORTOPEN/LPABORTOPEN for two reasons:
419 * - We do not want persistent state which close(2) does not clear
420 * - It is not used anyway, according to CUPS people
421 */
422
423 retval = usb_autopm_get_interface(intf);
424 if (retval < 0)
425 goto out;
426 usblp->used = 1;
427 file->private_data = usblp;
428
429 usblp->wcomplete = 1; /* we begin writeable */
430 usblp->wstatus = 0;
431 usblp->rcomplete = 0;
432
433 if (handle_bidir(usblp) < 0) {
434 usb_autopm_put_interface(intf);
435 usblp->used = 0;
436 file->private_data = NULL;
437 retval = -EIO;
438 }
439 out:
440 mutex_unlock(&usblp_mutex);
441 return retval;
442 }
443
444 static void usblp_cleanup(struct usblp *usblp)
445 {
446 printk(KERN_INFO "usblp%d: removed\n", usblp->minor);
447
448 kfree(usblp->readbuf);
449 kfree(usblp->device_id_string);
450 kfree(usblp->statusbuf);
451 kfree(usblp);
452 }
453
454 static void usblp_unlink_urbs(struct usblp *usblp)
455 {
456 usb_kill_anchored_urbs(&usblp->urbs);
457 }
458
459 static int usblp_release(struct inode *inode, struct file *file)
460 {
461 struct usblp *usblp = file->private_data;
462
463 usblp->flags &= ~LP_ABORT;
464
465 mutex_lock(&usblp_mutex);
466 usblp->used = 0;
467 if (usblp->present) {
468 usblp_unlink_urbs(usblp);
469 usb_autopm_put_interface(usblp->intf);
470 } else /* finish cleanup from disconnect */
471 usblp_cleanup(usblp);
472 mutex_unlock(&usblp_mutex);
473 return 0;
474 }
475
476 /* No kernel lock - fine */
477 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
478 {
479 int ret;
480 unsigned long flags;
481
482 struct usblp *usblp = file->private_data;
483 /* Should we check file->f_mode & FMODE_WRITE before poll_wait()? */
484 poll_wait(file, &usblp->rwait, wait);
485 poll_wait(file, &usblp->wwait, wait);
486 spin_lock_irqsave(&usblp->lock, flags);
487 ret = ((usblp->bidir && usblp->rcomplete) ? POLLIN | POLLRDNORM : 0) |
488 ((usblp->no_paper || usblp->wcomplete) ? POLLOUT | POLLWRNORM : 0);
489 spin_unlock_irqrestore(&usblp->lock, flags);
490 return ret;
491 }
492
493 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
494 {
495 struct usblp *usblp = file->private_data;
496 int length, err, i;
497 unsigned char newChannel;
498 int status;
499 int twoints[2];
500 int retval = 0;
501
502 mutex_lock(&usblp->mut);
503 if (!usblp->present) {
504 retval = -ENODEV;
505 goto done;
506 }
507
508 dev_dbg(&usblp->intf->dev,
509 "usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)\n", cmd,
510 _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd));
511
512 if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */
513
514 switch (_IOC_NR(cmd)) {
515
516 case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
517 if (_IOC_DIR(cmd) != _IOC_READ) {
518 retval = -EINVAL;
519 goto done;
520 }
521
522 length = usblp_cache_device_id_string(usblp);
523 if (length < 0) {
524 retval = length;
525 goto done;
526 }
527 if (length > _IOC_SIZE(cmd))
528 length = _IOC_SIZE(cmd); /* truncate */
529
530 if (copy_to_user((void __user *) arg,
531 usblp->device_id_string,
532 (unsigned long) length)) {
533 retval = -EFAULT;
534 goto done;
535 }
536
537 break;
538
539 case IOCNR_GET_PROTOCOLS:
540 if (_IOC_DIR(cmd) != _IOC_READ ||
541 _IOC_SIZE(cmd) < sizeof(twoints)) {
542 retval = -EINVAL;
543 goto done;
544 }
545
546 twoints[0] = usblp->current_protocol;
547 twoints[1] = 0;
548 for (i = USBLP_FIRST_PROTOCOL;
549 i <= USBLP_LAST_PROTOCOL; i++) {
550 if (usblp->protocol[i].alt_setting >= 0)
551 twoints[1] |= (1<<i);
552 }
553
554 if (copy_to_user((void __user *)arg,
555 (unsigned char *)twoints,
556 sizeof(twoints))) {
557 retval = -EFAULT;
558 goto done;
559 }
560
561 break;
562
563 case IOCNR_SET_PROTOCOL:
564 if (_IOC_DIR(cmd) != _IOC_WRITE) {
565 retval = -EINVAL;
566 goto done;
567 }
568
569 #ifdef DEBUG
570 if (arg == -10) {
571 usblp_dump(usblp);
572 break;
573 }
574 #endif
575
576 usblp_unlink_urbs(usblp);
577 retval = usblp_set_protocol(usblp, arg);
578 if (retval < 0) {
579 usblp_set_protocol(usblp,
580 usblp->current_protocol);
581 }
582 break;
583
584 case IOCNR_HP_SET_CHANNEL:
585 if (_IOC_DIR(cmd) != _IOC_WRITE ||
586 le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
587 usblp->quirks & USBLP_QUIRK_BIDIR) {
588 retval = -EINVAL;
589 goto done;
590 }
591
592 err = usblp_hp_channel_change_request(usblp,
593 arg, &newChannel);
594 if (err < 0) {
595 dev_err(&usblp->dev->dev,
596 "usblp%d: error = %d setting "
597 "HP channel\n",
598 usblp->minor, err);
599 retval = -EIO;
600 goto done;
601 }
602
603 dev_dbg(&usblp->intf->dev,
604 "usblp%d requested/got HP channel %ld/%d\n",
605 usblp->minor, arg, newChannel);
606 break;
607
608 case IOCNR_GET_BUS_ADDRESS:
609 if (_IOC_DIR(cmd) != _IOC_READ ||
610 _IOC_SIZE(cmd) < sizeof(twoints)) {
611 retval = -EINVAL;
612 goto done;
613 }
614
615 twoints[0] = usblp->dev->bus->busnum;
616 twoints[1] = usblp->dev->devnum;
617 if (copy_to_user((void __user *)arg,
618 (unsigned char *)twoints,
619 sizeof(twoints))) {
620 retval = -EFAULT;
621 goto done;
622 }
623
624 dev_dbg(&usblp->intf->dev,
625 "usblp%d is bus=%d, device=%d\n",
626 usblp->minor, twoints[0], twoints[1]);
627 break;
628
629 case IOCNR_GET_VID_PID:
630 if (_IOC_DIR(cmd) != _IOC_READ ||
631 _IOC_SIZE(cmd) < sizeof(twoints)) {
632 retval = -EINVAL;
633 goto done;
634 }
635
636 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
637 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
638 if (copy_to_user((void __user *)arg,
639 (unsigned char *)twoints,
640 sizeof(twoints))) {
641 retval = -EFAULT;
642 goto done;
643 }
644
645 dev_dbg(&usblp->intf->dev,
646 "usblp%d is VID=0x%4.4X, PID=0x%4.4X\n",
647 usblp->minor, twoints[0], twoints[1]);
648 break;
649
650 case IOCNR_SOFT_RESET:
651 if (_IOC_DIR(cmd) != _IOC_NONE) {
652 retval = -EINVAL;
653 goto done;
654 }
655 retval = usblp_reset(usblp);
656 break;
657 default:
658 retval = -ENOTTY;
659 }
660 else /* old-style ioctl value */
661 switch (cmd) {
662
663 case LPGETSTATUS:
664 if ((retval = usblp_read_status(usblp, usblp->statusbuf))) {
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 if ((writebuf = kmalloc(transfer_length, GFP_KERNEL)) == NULL)
698 return NULL;
699 if ((urb = usb_alloc_urb(0, GFP_KERNEL)) == NULL) {
700 kfree(writebuf);
701 return NULL;
702 }
703
704 usb_fill_bulk_urb(urb, usblp->dev,
705 usb_sndbulkpipe(usblp->dev,
706 usblp->protocol[usblp->current_protocol].epwrite->bEndpointAddress),
707 writebuf, transfer_length, usblp_bulk_write, usblp);
708 urb->transfer_flags |= URB_FREE_BUFFER;
709
710 return urb;
711 }
712
713 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
714 {
715 struct usblp *usblp = file->private_data;
716 struct urb *writeurb;
717 int rv;
718 int transfer_length;
719 ssize_t writecount = 0;
720
721 if (mutex_lock_interruptible(&usblp->wmut)) {
722 rv = -EINTR;
723 goto raise_biglock;
724 }
725 if ((rv = usblp_wwait(usblp, !!(file->f_flags & O_NONBLOCK))) < 0)
726 goto raise_wait;
727
728 while (writecount < count) {
729 /*
730 * Step 1: Submit next block.
731 */
732 if ((transfer_length = count - writecount) > USBLP_BUF_SIZE)
733 transfer_length = USBLP_BUF_SIZE;
734
735 rv = -ENOMEM;
736 if ((writeurb = usblp_new_writeurb(usblp, transfer_length)) == NULL)
737 goto raise_urb;
738 usb_anchor_urb(writeurb, &usblp->urbs);
739
740 if (copy_from_user(writeurb->transfer_buffer,
741 buffer + writecount, transfer_length)) {
742 rv = -EFAULT;
743 goto raise_badaddr;
744 }
745
746 spin_lock_irq(&usblp->lock);
747 usblp->wcomplete = 0;
748 spin_unlock_irq(&usblp->lock);
749 if ((rv = usb_submit_urb(writeurb, GFP_KERNEL)) < 0) {
750 usblp->wstatus = 0;
751 spin_lock_irq(&usblp->lock);
752 usblp->no_paper = 0;
753 usblp->wcomplete = 1;
754 wake_up(&usblp->wwait);
755 spin_unlock_irq(&usblp->lock);
756 if (rv != -ENOMEM)
757 rv = -EIO;
758 goto raise_submit;
759 }
760
761 /*
762 * Step 2: Wait for transfer to end, collect results.
763 */
764 rv = usblp_wwait(usblp, !!(file->f_flags&O_NONBLOCK));
765 if (rv < 0) {
766 if (rv == -EAGAIN) {
767 /* Presume that it's going to complete well. */
768 writecount += transfer_length;
769 }
770 if (rv == -ENOSPC) {
771 spin_lock_irq(&usblp->lock);
772 usblp->no_paper = 1; /* Mark for poll(2) */
773 spin_unlock_irq(&usblp->lock);
774 writecount += transfer_length;
775 }
776 /* Leave URB dangling, to be cleaned on close. */
777 goto collect_error;
778 }
779
780 if (usblp->wstatus < 0) {
781 rv = -EIO;
782 goto collect_error;
783 }
784 /*
785 * This is critical: it must be our URB, not other writer's.
786 * The wmut exists mainly to cover us here.
787 */
788 writecount += usblp->wstatus;
789 }
790
791 mutex_unlock(&usblp->wmut);
792 return writecount;
793
794 raise_submit:
795 raise_badaddr:
796 usb_unanchor_urb(writeurb);
797 usb_free_urb(writeurb);
798 raise_urb:
799 raise_wait:
800 collect_error: /* Out of raise sequence */
801 mutex_unlock(&usblp->wmut);
802 raise_biglock:
803 return writecount ? writecount : rv;
804 }
805
806 /*
807 * Notice that we fail to restart in a few cases: on EFAULT, on restart
808 * error, etc. This is the historical behaviour. In all such cases we return
809 * EIO, and applications loop in order to get the new read going.
810 */
811 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t len, loff_t *ppos)
812 {
813 struct usblp *usblp = file->private_data;
814 ssize_t count;
815 ssize_t avail;
816 int rv;
817
818 if (!usblp->bidir)
819 return -EINVAL;
820
821 rv = usblp_rwait_and_lock(usblp, !!(file->f_flags & O_NONBLOCK));
822 if (rv < 0)
823 return rv;
824
825 if ((avail = usblp->rstatus) < 0) {
826 printk(KERN_ERR "usblp%d: error %d reading from printer\n",
827 usblp->minor, (int)avail);
828 usblp_submit_read(usblp);
829 count = -EIO;
830 goto done;
831 }
832
833 count = len < avail - usblp->readcount ? len : avail - usblp->readcount;
834 if (count != 0 &&
835 copy_to_user(buffer, usblp->readbuf + usblp->readcount, count)) {
836 count = -EFAULT;
837 goto done;
838 }
839
840 if ((usblp->readcount += count) == avail) {
841 if (usblp_submit_read(usblp) < 0) {
842 /* We don't want to leak USB return codes into errno. */
843 if (count == 0)
844 count = -EIO;
845 goto done;
846 }
847 }
848
849 done:
850 mutex_unlock(&usblp->mut);
851 return count;
852 }
853
854 /*
855 * Wait for the write path to come idle.
856 * This is called under the ->wmut, so the idle path stays idle.
857 *
858 * Our write path has a peculiar property: it does not buffer like a tty,
859 * but waits for the write to succeed. This allows our ->release to bug out
860 * without waiting for writes to drain. But it obviously does not work
861 * when O_NONBLOCK is set. So, applications setting O_NONBLOCK must use
862 * select(2) or poll(2) to wait for the buffer to drain before closing.
863 * Alternatively, set blocking mode with fcntl and issue a zero-size write.
864 */
865 static int usblp_wwait(struct usblp *usblp, int nonblock)
866 {
867 DECLARE_WAITQUEUE(waita, current);
868 int rc;
869 int err = 0;
870
871 add_wait_queue(&usblp->wwait, &waita);
872 for (;;) {
873 set_current_state(TASK_INTERRUPTIBLE);
874 if (mutex_lock_interruptible(&usblp->mut)) {
875 rc = -EINTR;
876 break;
877 }
878 rc = usblp_wtest(usblp, nonblock);
879 mutex_unlock(&usblp->mut);
880 if (rc <= 0)
881 break;
882
883 if (schedule_timeout(msecs_to_jiffies(1500)) == 0) {
884 if (usblp->flags & LP_ABORT) {
885 err = usblp_check_status(usblp, err);
886 if (err == 1) { /* Paper out */
887 rc = -ENOSPC;
888 break;
889 }
890 } else {
891 /* Prod the printer, Gentoo#251237. */
892 mutex_lock(&usblp->mut);
893 usblp_read_status(usblp, usblp->statusbuf);
894 mutex_unlock(&usblp->mut);
895 }
896 }
897 }
898 set_current_state(TASK_RUNNING);
899 remove_wait_queue(&usblp->wwait, &waita);
900 return rc;
901 }
902
903 static int usblp_wtest(struct usblp *usblp, int nonblock)
904 {
905 unsigned long flags;
906
907 if (!usblp->present)
908 return -ENODEV;
909 if (signal_pending(current))
910 return -EINTR;
911 spin_lock_irqsave(&usblp->lock, flags);
912 if (usblp->wcomplete) {
913 spin_unlock_irqrestore(&usblp->lock, flags);
914 return 0;
915 }
916 spin_unlock_irqrestore(&usblp->lock, flags);
917 if (nonblock)
918 return -EAGAIN;
919 return 1;
920 }
921
922 /*
923 * Wait for read bytes to become available. This probably should have been
924 * called usblp_r_lock_and_wait(), because we lock first. But it's a traditional
925 * name for functions which lock and return.
926 *
927 * We do not use wait_event_interruptible because it makes locking iffy.
928 */
929 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock)
930 {
931 DECLARE_WAITQUEUE(waita, current);
932 int rc;
933
934 add_wait_queue(&usblp->rwait, &waita);
935 for (;;) {
936 if (mutex_lock_interruptible(&usblp->mut)) {
937 rc = -EINTR;
938 break;
939 }
940 set_current_state(TASK_INTERRUPTIBLE);
941 if ((rc = usblp_rtest(usblp, nonblock)) < 0) {
942 mutex_unlock(&usblp->mut);
943 break;
944 }
945 if (rc == 0) /* Keep it locked */
946 break;
947 mutex_unlock(&usblp->mut);
948 schedule();
949 }
950 set_current_state(TASK_RUNNING);
951 remove_wait_queue(&usblp->rwait, &waita);
952 return rc;
953 }
954
955 static int usblp_rtest(struct usblp *usblp, int nonblock)
956 {
957 unsigned long flags;
958
959 if (!usblp->present)
960 return -ENODEV;
961 if (signal_pending(current))
962 return -EINTR;
963 spin_lock_irqsave(&usblp->lock, flags);
964 if (usblp->rcomplete) {
965 spin_unlock_irqrestore(&usblp->lock, flags);
966 return 0;
967 }
968 spin_unlock_irqrestore(&usblp->lock, flags);
969 if (nonblock)
970 return -EAGAIN;
971 return 1;
972 }
973
974 /*
975 * Please check ->bidir and other such things outside for now.
976 */
977 static int usblp_submit_read(struct usblp *usblp)
978 {
979 struct urb *urb;
980 unsigned long flags;
981 int rc;
982
983 rc = -ENOMEM;
984 if ((urb = usb_alloc_urb(0, GFP_KERNEL)) == NULL)
985 goto raise_urb;
986
987 usb_fill_bulk_urb(urb, usblp->dev,
988 usb_rcvbulkpipe(usblp->dev,
989 usblp->protocol[usblp->current_protocol].epread->bEndpointAddress),
990 usblp->readbuf, USBLP_BUF_SIZE_IN,
991 usblp_bulk_read, usblp);
992 usb_anchor_urb(urb, &usblp->urbs);
993
994 spin_lock_irqsave(&usblp->lock, flags);
995 usblp->readcount = 0; /* XXX Why here? */
996 usblp->rcomplete = 0;
997 spin_unlock_irqrestore(&usblp->lock, flags);
998 if ((rc = usb_submit_urb(urb, GFP_KERNEL)) < 0) {
999 dev_dbg(&usblp->intf->dev, "error submitting urb (%d)\n", rc);
1000 spin_lock_irqsave(&usblp->lock, flags);
1001 usblp->rstatus = rc;
1002 usblp->rcomplete = 1;
1003 spin_unlock_irqrestore(&usblp->lock, flags);
1004 goto raise_submit;
1005 }
1006
1007 return 0;
1008
1009 raise_submit:
1010 usb_unanchor_urb(urb);
1011 usb_free_urb(urb);
1012 raise_urb:
1013 return rc;
1014 }
1015
1016 /*
1017 * Checks for printers that have quirks, such as requiring unidirectional
1018 * communication but reporting bidirectional; currently some HP printers
1019 * have this flaw (HP 810, 880, 895, etc.), or needing an init string
1020 * sent at each open (like some Epsons).
1021 * Returns 1 if found, 0 if not found.
1022 *
1023 * HP recommended that we use the bidirectional interface but
1024 * don't attempt any bulk IN transfers from the IN endpoint.
1025 * Here's some more detail on the problem:
1026 * The problem is not that it isn't bidirectional though. The problem
1027 * is that if you request a device ID, or status information, while
1028 * the buffers are full, the return data will end up in the print data
1029 * buffer. For example if you make sure you never request the device ID
1030 * while you are sending print data, and you don't try to query the
1031 * printer status every couple of milliseconds, you will probably be OK.
1032 */
1033 static unsigned int usblp_quirks(__u16 vendor, __u16 product)
1034 {
1035 int i;
1036
1037 for (i = 0; quirk_printers[i].vendorId; i++) {
1038 if (vendor == quirk_printers[i].vendorId &&
1039 product == quirk_printers[i].productId)
1040 return quirk_printers[i].quirks;
1041 }
1042 return 0;
1043 }
1044
1045 static const struct file_operations usblp_fops = {
1046 .owner = THIS_MODULE,
1047 .read = usblp_read,
1048 .write = usblp_write,
1049 .poll = usblp_poll,
1050 .unlocked_ioctl = usblp_ioctl,
1051 .compat_ioctl = usblp_ioctl,
1052 .open = usblp_open,
1053 .release = usblp_release,
1054 .llseek = noop_llseek,
1055 };
1056
1057 static char *usblp_devnode(struct device *dev, umode_t *mode)
1058 {
1059 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
1060 }
1061
1062 static struct usb_class_driver usblp_class = {
1063 .name = "lp%d",
1064 .devnode = usblp_devnode,
1065 .fops = &usblp_fops,
1066 .minor_base = USBLP_MINOR_BASE,
1067 };
1068
1069 static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf)
1070 {
1071 struct usb_interface *intf = to_usb_interface(dev);
1072 struct usblp *usblp = usb_get_intfdata(intf);
1073
1074 if (usblp->device_id_string[0] == 0 &&
1075 usblp->device_id_string[1] == 0)
1076 return 0;
1077
1078 return sprintf(buf, "%s", usblp->device_id_string+2);
1079 }
1080
1081 static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL);
1082
1083 static int usblp_probe(struct usb_interface *intf,
1084 const struct usb_device_id *id)
1085 {
1086 struct usb_device *dev = interface_to_usbdev(intf);
1087 struct usblp *usblp;
1088 int protocol;
1089 int retval;
1090
1091 /* Malloc and start initializing usblp structure so we can use it
1092 * directly. */
1093 usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL);
1094 if (!usblp) {
1095 retval = -ENOMEM;
1096 goto abort_ret;
1097 }
1098 usblp->dev = dev;
1099 mutex_init(&usblp->wmut);
1100 mutex_init(&usblp->mut);
1101 spin_lock_init(&usblp->lock);
1102 init_waitqueue_head(&usblp->rwait);
1103 init_waitqueue_head(&usblp->wwait);
1104 init_usb_anchor(&usblp->urbs);
1105 usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
1106 usblp->intf = intf;
1107
1108 /* Malloc device ID string buffer to the largest expected length,
1109 * since we can re-query it on an ioctl and a dynamic string
1110 * could change in length. */
1111 if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
1112 retval = -ENOMEM;
1113 goto abort;
1114 }
1115
1116 /*
1117 * Allocate read buffer. We somewhat wastefully
1118 * malloc both regardless of bidirectionality, because the
1119 * alternate setting can be changed later via an ioctl.
1120 */
1121 if (!(usblp->readbuf = kmalloc(USBLP_BUF_SIZE_IN, GFP_KERNEL))) {
1122 retval = -ENOMEM;
1123 goto abort;
1124 }
1125
1126 /* Allocate buffer for printer status */
1127 usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
1128 if (!usblp->statusbuf) {
1129 retval = -ENOMEM;
1130 goto abort;
1131 }
1132
1133 /* Lookup quirks for this printer. */
1134 usblp->quirks = usblp_quirks(
1135 le16_to_cpu(dev->descriptor.idVendor),
1136 le16_to_cpu(dev->descriptor.idProduct));
1137
1138 /* Analyze and pick initial alternate settings and endpoints. */
1139 protocol = usblp_select_alts(usblp);
1140 if (protocol < 0) {
1141 dev_dbg(&intf->dev,
1142 "incompatible printer-class device 0x%4.4X/0x%4.4X\n",
1143 le16_to_cpu(dev->descriptor.idVendor),
1144 le16_to_cpu(dev->descriptor.idProduct));
1145 retval = -ENODEV;
1146 goto abort;
1147 }
1148
1149 /* Setup the selected alternate setting and endpoints. */
1150 if (usblp_set_protocol(usblp, protocol) < 0) {
1151 retval = -ENODEV; /* ->probe isn't ->ioctl */
1152 goto abort;
1153 }
1154
1155 /* Retrieve and store the device ID string. */
1156 usblp_cache_device_id_string(usblp);
1157 retval = device_create_file(&intf->dev, &dev_attr_ieee1284_id);
1158 if (retval)
1159 goto abort_intfdata;
1160
1161 #ifdef DEBUG
1162 usblp_check_status(usblp, 0);
1163 #endif
1164
1165 usb_set_intfdata(intf, usblp);
1166
1167 usblp->present = 1;
1168
1169 retval = usb_register_dev(intf, &usblp_class);
1170 if (retval) {
1171 dev_err(&intf->dev,
1172 "usblp: Not able to get a minor (base %u, slice default): %d\n",
1173 USBLP_MINOR_BASE, retval);
1174 goto abort_intfdata;
1175 }
1176 usblp->minor = intf->minor;
1177 dev_info(&intf->dev,
1178 "usblp%d: USB %sdirectional printer dev %d if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X\n",
1179 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
1180 usblp->ifnum,
1181 usblp->protocol[usblp->current_protocol].alt_setting,
1182 usblp->current_protocol,
1183 le16_to_cpu(usblp->dev->descriptor.idVendor),
1184 le16_to_cpu(usblp->dev->descriptor.idProduct));
1185
1186 return 0;
1187
1188 abort_intfdata:
1189 usb_set_intfdata(intf, NULL);
1190 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1191 abort:
1192 kfree(usblp->readbuf);
1193 kfree(usblp->statusbuf);
1194 kfree(usblp->device_id_string);
1195 kfree(usblp);
1196 abort_ret:
1197 return retval;
1198 }
1199
1200 /*
1201 * We are a "new" style driver with usb_device_id table,
1202 * but our requirements are too intricate for simple match to handle.
1203 *
1204 * The "proto_bias" option may be used to specify the preferred protocol
1205 * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3). If the device
1206 * supports the preferred protocol, then we bind to it.
1207 *
1208 * The best interface for us is 7/1/2, because it is compatible
1209 * with a stream of characters. If we find it, we bind to it.
1210 *
1211 * Note that the people from hpoj.sourceforge.net need to be able to
1212 * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
1213 *
1214 * Failing 7/1/2, we look for 7/1/3, even though it's probably not
1215 * stream-compatible, because this matches the behaviour of the old code.
1216 *
1217 * If nothing else, we bind to 7/1/1 - the unidirectional interface.
1218 */
1219 static int usblp_select_alts(struct usblp *usblp)
1220 {
1221 struct usb_interface *if_alt;
1222 struct usb_host_interface *ifd;
1223 struct usb_endpoint_descriptor *epd, *epwrite, *epread;
1224 int p, i, e;
1225
1226 if_alt = usblp->intf;
1227
1228 for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1229 usblp->protocol[p].alt_setting = -1;
1230
1231 /* Find out what we have. */
1232 for (i = 0; i < if_alt->num_altsetting; i++) {
1233 ifd = &if_alt->altsetting[i];
1234
1235 if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
1236 if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS))
1237 continue;
1238
1239 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1240 ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1241 continue;
1242
1243 /* Look for bulk OUT and IN endpoints. */
1244 epwrite = epread = NULL;
1245 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1246 epd = &ifd->endpoint[e].desc;
1247
1248 if (usb_endpoint_is_bulk_out(epd))
1249 if (!epwrite)
1250 epwrite = epd;
1251
1252 if (usb_endpoint_is_bulk_in(epd))
1253 if (!epread)
1254 epread = epd;
1255 }
1256
1257 /* Ignore buggy hardware without the right endpoints. */
1258 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1259 continue;
1260
1261 /* Turn off reads for 7/1/1 (unidirectional) interfaces
1262 * and buggy bidirectional printers. */
1263 if (ifd->desc.bInterfaceProtocol == 1) {
1264 epread = NULL;
1265 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1266 printk(KERN_INFO "usblp%d: Disabling reads from "
1267 "problematic bidirectional printer\n",
1268 usblp->minor);
1269 epread = NULL;
1270 }
1271
1272 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1273 ifd->desc.bAlternateSetting;
1274 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1275 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1276 }
1277
1278 /* If our requested protocol is supported, then use it. */
1279 if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1280 proto_bias <= USBLP_LAST_PROTOCOL &&
1281 usblp->protocol[proto_bias].alt_setting != -1)
1282 return proto_bias;
1283
1284 /* Ordering is important here. */
1285 if (usblp->protocol[2].alt_setting != -1)
1286 return 2;
1287 if (usblp->protocol[1].alt_setting != -1)
1288 return 1;
1289 if (usblp->protocol[3].alt_setting != -1)
1290 return 3;
1291
1292 /* If nothing is available, then don't bind to this device. */
1293 return -1;
1294 }
1295
1296 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1297 {
1298 int r, alts;
1299
1300 if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1301 return -EINVAL;
1302
1303 alts = usblp->protocol[protocol].alt_setting;
1304 if (alts < 0)
1305 return -EINVAL;
1306 r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1307 if (r < 0) {
1308 printk(KERN_ERR "usblp: can't set desired altsetting %d on interface %d\n",
1309 alts, usblp->ifnum);
1310 return r;
1311 }
1312
1313 usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1314 usblp->current_protocol = protocol;
1315 dev_dbg(&usblp->intf->dev, "usblp%d set protocol %d\n",
1316 usblp->minor, protocol);
1317 return 0;
1318 }
1319
1320 /* Retrieves and caches device ID string.
1321 * Returns length, including length bytes but not null terminator.
1322 * On error, returns a negative errno value. */
1323 static int usblp_cache_device_id_string(struct usblp *usblp)
1324 {
1325 int err, length;
1326
1327 err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1328 if (err < 0) {
1329 dev_dbg(&usblp->intf->dev,
1330 "usblp%d: error = %d reading IEEE-1284 Device ID string\n",
1331 usblp->minor, err);
1332 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1333 return -EIO;
1334 }
1335
1336 /* First two bytes are length in big-endian.
1337 * They count themselves, and we copy them into
1338 * the user's buffer. */
1339 length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1340 if (length < 2)
1341 length = 2;
1342 else if (length >= USBLP_DEVICE_ID_SIZE)
1343 length = USBLP_DEVICE_ID_SIZE - 1;
1344 usblp->device_id_string[length] = '\0';
1345
1346 dev_dbg(&usblp->intf->dev, "usblp%d Device ID string [len=%d]=\"%s\"\n",
1347 usblp->minor, length, &usblp->device_id_string[2]);
1348
1349 return length;
1350 }
1351
1352 static void usblp_disconnect(struct usb_interface *intf)
1353 {
1354 struct usblp *usblp = usb_get_intfdata(intf);
1355
1356 usb_deregister_dev(intf, &usblp_class);
1357
1358 if (!usblp || !usblp->dev) {
1359 dev_err(&intf->dev, "bogus disconnect\n");
1360 BUG();
1361 }
1362
1363 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1364
1365 mutex_lock(&usblp_mutex);
1366 mutex_lock(&usblp->mut);
1367 usblp->present = 0;
1368 wake_up(&usblp->wwait);
1369 wake_up(&usblp->rwait);
1370 usb_set_intfdata(intf, NULL);
1371
1372 usblp_unlink_urbs(usblp);
1373 mutex_unlock(&usblp->mut);
1374
1375 if (!usblp->used)
1376 usblp_cleanup(usblp);
1377 mutex_unlock(&usblp_mutex);
1378 }
1379
1380 static int usblp_suspend(struct usb_interface *intf, pm_message_t message)
1381 {
1382 struct usblp *usblp = usb_get_intfdata(intf);
1383
1384 usblp_unlink_urbs(usblp);
1385 #if 0 /* XXX Do we want this? What if someone is reading, should we fail? */
1386 /* not strictly necessary, but just in case */
1387 wake_up(&usblp->wwait);
1388 wake_up(&usblp->rwait);
1389 #endif
1390
1391 return 0;
1392 }
1393
1394 static int usblp_resume(struct usb_interface *intf)
1395 {
1396 struct usblp *usblp = usb_get_intfdata(intf);
1397 int r;
1398
1399 r = handle_bidir(usblp);
1400
1401 return r;
1402 }
1403
1404 static const struct usb_device_id usblp_ids[] = {
1405 { USB_DEVICE_INFO(7, 1, 1) },
1406 { USB_DEVICE_INFO(7, 1, 2) },
1407 { USB_DEVICE_INFO(7, 1, 3) },
1408 { USB_INTERFACE_INFO(7, 1, 1) },
1409 { USB_INTERFACE_INFO(7, 1, 2) },
1410 { USB_INTERFACE_INFO(7, 1, 3) },
1411 { USB_DEVICE(0x04b8, 0x0202) }, /* Seiko Epson Receipt Printer M129C */
1412 { } /* Terminating entry */
1413 };
1414
1415 MODULE_DEVICE_TABLE(usb, usblp_ids);
1416
1417 static struct usb_driver usblp_driver = {
1418 .name = "usblp",
1419 .probe = usblp_probe,
1420 .disconnect = usblp_disconnect,
1421 .suspend = usblp_suspend,
1422 .resume = usblp_resume,
1423 .id_table = usblp_ids,
1424 .supports_autosuspend = 1,
1425 };
1426
1427 module_usb_driver(usblp_driver);
1428
1429 MODULE_AUTHOR(DRIVER_AUTHOR);
1430 MODULE_DESCRIPTION(DRIVER_DESC);
1431 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1432 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1433 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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