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35#include <linux/module.h>
36#include <linux/kernel.h>
37#include <linux/sched/signal.h>
38#include <linux/signal.h>
39#include <linux/poll.h>
40#include <linux/slab.h>
41#include <linux/lp.h>
42#include <linux/mutex.h>
43#undef DEBUG
44#include <linux/usb.h>
45#include <linux/usb/ch9.h>
46#include <linux/ratelimit.h>
47
48
49
50
51#define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal"
52#define DRIVER_DESC "USB Printer Device Class driver"
53
54#define USBLP_BUF_SIZE 8192
55#define USBLP_BUF_SIZE_IN 1024
56#define USBLP_DEVICE_ID_SIZE 1024
57
58
59#define IOCNR_GET_DEVICE_ID 1
60#define IOCNR_GET_PROTOCOLS 2
61#define IOCNR_SET_PROTOCOL 3
62#define IOCNR_HP_SET_CHANNEL 4
63#define IOCNR_GET_BUS_ADDRESS 5
64#define IOCNR_GET_VID_PID 6
65#define IOCNR_SOFT_RESET 7
66
67#define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len)
68
69
70
71
72
73
74
75
76#define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
77
78
79
80
81
82#define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0)
83
84#define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0)
85
86#define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len)
87
88#define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len)
89
90#define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0);
91
92
93
94
95
96
97
98
99
100
101
102
103
104#define USBLP_REQ_GET_ID 0x00
105#define USBLP_REQ_GET_STATUS 0x01
106#define USBLP_REQ_RESET 0x02
107#define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST 0x00
108
109#define USBLP_MINORS 16
110#define USBLP_MINOR_BASE 0
111
112#define USBLP_CTL_TIMEOUT 5000
113
114#define USBLP_FIRST_PROTOCOL 1
115#define USBLP_LAST_PROTOCOL 3
116#define USBLP_MAX_PROTOCOLS (USBLP_LAST_PROTOCOL+1)
117
118
119
120
121
122#define STATUS_BUF_SIZE 8
123
124
125
126
127
128
129
130
131struct usblp {
132 struct usb_device *dev;
133 struct mutex wmut;
134 struct mutex mut;
135 spinlock_t lock;
136 char *readbuf;
137 char *statusbuf;
138 struct usb_anchor urbs;
139 wait_queue_head_t rwait, wwait;
140 int readcount;
141 int ifnum;
142 struct usb_interface *intf;
143
144
145
146
147 struct {
148 int alt_setting;
149 struct usb_endpoint_descriptor *epwrite;
150 struct usb_endpoint_descriptor *epread;
151 } protocol[USBLP_MAX_PROTOCOLS];
152 int current_protocol;
153 int minor;
154 int wcomplete, rcomplete;
155 int wstatus;
156 int rstatus;
157 unsigned int quirks;
158 unsigned int flags;
159 unsigned char used;
160 unsigned char present;
161 unsigned char bidir;
162 unsigned char no_paper;
163 unsigned char *device_id_string;
164
165};
166
167#ifdef DEBUG
168static void usblp_dump(struct usblp *usblp)
169{
170 struct device *dev = &usblp->intf->dev;
171 int p;
172
173 dev_dbg(dev, "usblp=0x%p\n", usblp);
174 dev_dbg(dev, "dev=0x%p\n", usblp->dev);
175 dev_dbg(dev, "present=%d\n", usblp->present);
176 dev_dbg(dev, "readbuf=0x%p\n", usblp->readbuf);
177 dev_dbg(dev, "readcount=%d\n", usblp->readcount);
178 dev_dbg(dev, "ifnum=%d\n", usblp->ifnum);
179 for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
180 dev_dbg(dev, "protocol[%d].alt_setting=%d\n", p,
181 usblp->protocol[p].alt_setting);
182 dev_dbg(dev, "protocol[%d].epwrite=%p\n", p,
183 usblp->protocol[p].epwrite);
184 dev_dbg(dev, "protocol[%d].epread=%p\n", p,
185 usblp->protocol[p].epread);
186 }
187 dev_dbg(dev, "current_protocol=%d\n", usblp->current_protocol);
188 dev_dbg(dev, "minor=%d\n", usblp->minor);
189 dev_dbg(dev, "wstatus=%d\n", usblp->wstatus);
190 dev_dbg(dev, "rstatus=%d\n", usblp->rstatus);
191 dev_dbg(dev, "quirks=%d\n", usblp->quirks);
192 dev_dbg(dev, "used=%d\n", usblp->used);
193 dev_dbg(dev, "bidir=%d\n", usblp->bidir);
194 dev_dbg(dev, "device_id_string=\"%s\"\n",
195 usblp->device_id_string ?
196 usblp->device_id_string + 2 :
197 (unsigned char *)"(null)");
198}
199#endif
200
201
202
203struct quirk_printer_struct {
204 __u16 vendorId;
205 __u16 productId;
206 unsigned int quirks;
207};
208
209#define USBLP_QUIRK_BIDIR 0x1
210#define USBLP_QUIRK_USB_INIT 0x2
211#define USBLP_QUIRK_BAD_CLASS 0x4
212
213static const struct quirk_printer_struct quirk_printers[] = {
214 { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR },
215 { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR },
216 { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR },
217 { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR },
218 { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR },
219 { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR },
220 { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR },
221 { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR },
222 { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR },
223 { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR },
224 { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR },
225 { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR },
226 { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR },
227 { 0x0482, 0x0010, USBLP_QUIRK_BIDIR },
228 { 0x04f9, 0x000d, USBLP_QUIRK_BIDIR },
229 { 0x04b8, 0x0202, USBLP_QUIRK_BAD_CLASS },
230 { 0, 0 }
231};
232
233static int usblp_wwait(struct usblp *usblp, int nonblock);
234static int usblp_wtest(struct usblp *usblp, int nonblock);
235static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock);
236static int usblp_rtest(struct usblp *usblp, int nonblock);
237static int usblp_submit_read(struct usblp *usblp);
238static int usblp_select_alts(struct usblp *usblp);
239static int usblp_set_protocol(struct usblp *usblp, int protocol);
240static int usblp_cache_device_id_string(struct usblp *usblp);
241
242
243static struct usb_driver usblp_driver;
244static DEFINE_MUTEX(usblp_mutex);
245
246
247
248
249
250static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
251{
252 int retval;
253 int index = usblp->ifnum;
254
255
256
257
258 if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS))
259 index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
260
261 retval = usb_control_msg(usblp->dev,
262 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
263 request, type | dir | recip, value, index, buf, len, USBLP_CTL_TIMEOUT);
264 dev_dbg(&usblp->intf->dev,
265 "usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d\n",
266 request, !!dir, recip, value, index, len, retval);
267 return retval < 0 ? retval : 0;
268}
269
270#define usblp_read_status(usblp, status)\
271 usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
272#define usblp_get_id(usblp, config, id, maxlen)\
273 usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
274#define usblp_reset(usblp)\
275 usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
276
277static int usblp_hp_channel_change_request(struct usblp *usblp, int channel, u8 *new_channel)
278{
279 u8 *buf;
280 int ret;
281
282 buf = kzalloc(1, GFP_KERNEL);
283 if (!buf)
284 return -ENOMEM;
285
286 ret = usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST,
287 USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE,
288 channel, buf, 1);
289 if (ret == 0)
290 *new_channel = buf[0];
291
292 kfree(buf);
293
294 return ret;
295}
296
297
298
299
300
301
302static int proto_bias = -1;
303
304
305
306
307
308static void usblp_bulk_read(struct urb *urb)
309{
310 struct usblp *usblp = urb->context;
311 int status = urb->status;
312 unsigned long flags;
313
314 if (usblp->present && usblp->used) {
315 if (status)
316 printk(KERN_WARNING "usblp%d: "
317 "nonzero read bulk status received: %d\n",
318 usblp->minor, status);
319 }
320 spin_lock_irqsave(&usblp->lock, flags);
321 if (status < 0)
322 usblp->rstatus = status;
323 else
324 usblp->rstatus = urb->actual_length;
325 usblp->rcomplete = 1;
326 wake_up(&usblp->rwait);
327 spin_unlock_irqrestore(&usblp->lock, flags);
328
329 usb_free_urb(urb);
330}
331
332static void usblp_bulk_write(struct urb *urb)
333{
334 struct usblp *usblp = urb->context;
335 int status = urb->status;
336 unsigned long flags;
337
338 if (usblp->present && usblp->used) {
339 if (status)
340 printk(KERN_WARNING "usblp%d: "
341 "nonzero write bulk status received: %d\n",
342 usblp->minor, status);
343 }
344 spin_lock_irqsave(&usblp->lock, flags);
345 if (status < 0)
346 usblp->wstatus = status;
347 else
348 usblp->wstatus = urb->actual_length;
349 usblp->no_paper = 0;
350 usblp->wcomplete = 1;
351 wake_up(&usblp->wwait);
352 spin_unlock_irqrestore(&usblp->lock, flags);
353
354 usb_free_urb(urb);
355}
356
357
358
359
360
361static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
362
363static int usblp_check_status(struct usblp *usblp, int err)
364{
365 unsigned char status, newerr = 0;
366 int error;
367
368 mutex_lock(&usblp->mut);
369 if ((error = usblp_read_status(usblp, usblp->statusbuf)) < 0) {
370 mutex_unlock(&usblp->mut);
371 printk_ratelimited(KERN_ERR
372 "usblp%d: error %d reading printer status\n",
373 usblp->minor, error);
374 return 0;
375 }
376 status = *usblp->statusbuf;
377 mutex_unlock(&usblp->mut);
378
379 if (~status & LP_PERRORP)
380 newerr = 3;
381 if (status & LP_POUTPA)
382 newerr = 1;
383 if (~status & LP_PSELECD)
384 newerr = 2;
385
386 if (newerr != err) {
387 printk(KERN_INFO "usblp%d: %s\n",
388 usblp->minor, usblp_messages[newerr]);
389 }
390
391 return newerr;
392}
393
394static int handle_bidir(struct usblp *usblp)
395{
396 if (usblp->bidir && usblp->used) {
397 if (usblp_submit_read(usblp) < 0)
398 return -EIO;
399 }
400 return 0;
401}
402
403
404
405
406
407static int usblp_open(struct inode *inode, struct file *file)
408{
409 int minor = iminor(inode);
410 struct usblp *usblp;
411 struct usb_interface *intf;
412 int retval;
413
414 if (minor < 0)
415 return -ENODEV;
416
417 mutex_lock(&usblp_mutex);
418
419 retval = -ENODEV;
420 intf = usb_find_interface(&usblp_driver, minor);
421 if (!intf)
422 goto out;
423 usblp = usb_get_intfdata(intf);
424 if (!usblp || !usblp->dev || !usblp->present)
425 goto out;
426
427 retval = -EBUSY;
428 if (usblp->used)
429 goto out;
430
431
432
433
434
435
436
437 retval = usb_autopm_get_interface(intf);
438 if (retval < 0)
439 goto out;
440 usblp->used = 1;
441 file->private_data = usblp;
442
443 usblp->wcomplete = 1;
444 usblp->wstatus = 0;
445 usblp->rcomplete = 0;
446
447 if (handle_bidir(usblp) < 0) {
448 usb_autopm_put_interface(intf);
449 usblp->used = 0;
450 file->private_data = NULL;
451 retval = -EIO;
452 }
453out:
454 mutex_unlock(&usblp_mutex);
455 return retval;
456}
457
458static void usblp_cleanup(struct usblp *usblp)
459{
460 printk(KERN_INFO "usblp%d: removed\n", usblp->minor);
461
462 kfree(usblp->readbuf);
463 kfree(usblp->device_id_string);
464 kfree(usblp->statusbuf);
465 usb_put_intf(usblp->intf);
466 kfree(usblp);
467}
468
469static void usblp_unlink_urbs(struct usblp *usblp)
470{
471 usb_kill_anchored_urbs(&usblp->urbs);
472}
473
474static int usblp_release(struct inode *inode, struct file *file)
475{
476 struct usblp *usblp = file->private_data;
477
478 usblp->flags &= ~LP_ABORT;
479
480 mutex_lock(&usblp_mutex);
481 usblp->used = 0;
482 if (usblp->present)
483 usblp_unlink_urbs(usblp);
484
485 usb_autopm_put_interface(usblp->intf);
486
487 if (!usblp->present)
488 usblp_cleanup(usblp);
489
490 mutex_unlock(&usblp_mutex);
491 return 0;
492}
493
494
495static __poll_t usblp_poll(struct file *file, struct poll_table_struct *wait)
496{
497 struct usblp *usblp = file->private_data;
498 __poll_t ret = 0;
499 unsigned long flags;
500
501
502 poll_wait(file, &usblp->rwait, wait);
503 poll_wait(file, &usblp->wwait, wait);
504
505 mutex_lock(&usblp->mut);
506 if (!usblp->present)
507 ret |= EPOLLHUP;
508 mutex_unlock(&usblp->mut);
509
510 spin_lock_irqsave(&usblp->lock, flags);
511 if (usblp->bidir && usblp->rcomplete)
512 ret |= EPOLLIN | EPOLLRDNORM;
513 if (usblp->no_paper || usblp->wcomplete)
514 ret |= EPOLLOUT | EPOLLWRNORM;
515 spin_unlock_irqrestore(&usblp->lock, flags);
516 return ret;
517}
518
519static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
520{
521 struct usblp *usblp = file->private_data;
522 int length, err, i;
523 unsigned char newChannel;
524 int status;
525 int twoints[2];
526 int retval = 0;
527
528 mutex_lock(&usblp->mut);
529 if (!usblp->present) {
530 retval = -ENODEV;
531 goto done;
532 }
533
534 dev_dbg(&usblp->intf->dev,
535 "usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)\n", cmd,
536 _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd));
537
538 if (_IOC_TYPE(cmd) == 'P')
539
540 switch (_IOC_NR(cmd)) {
541
542 case IOCNR_GET_DEVICE_ID:
543 if (_IOC_DIR(cmd) != _IOC_READ) {
544 retval = -EINVAL;
545 goto done;
546 }
547
548 length = usblp_cache_device_id_string(usblp);
549 if (length < 0) {
550 retval = length;
551 goto done;
552 }
553 if (length > _IOC_SIZE(cmd))
554 length = _IOC_SIZE(cmd);
555
556 if (copy_to_user((void __user *) arg,
557 usblp->device_id_string,
558 (unsigned long) length)) {
559 retval = -EFAULT;
560 goto done;
561 }
562
563 break;
564
565 case IOCNR_GET_PROTOCOLS:
566 if (_IOC_DIR(cmd) != _IOC_READ ||
567 _IOC_SIZE(cmd) < sizeof(twoints)) {
568 retval = -EINVAL;
569 goto done;
570 }
571
572 twoints[0] = usblp->current_protocol;
573 twoints[1] = 0;
574 for (i = USBLP_FIRST_PROTOCOL;
575 i <= USBLP_LAST_PROTOCOL; i++) {
576 if (usblp->protocol[i].alt_setting >= 0)
577 twoints[1] |= (1<<i);
578 }
579
580 if (copy_to_user((void __user *)arg,
581 (unsigned char *)twoints,
582 sizeof(twoints))) {
583 retval = -EFAULT;
584 goto done;
585 }
586
587 break;
588
589 case IOCNR_SET_PROTOCOL:
590 if (_IOC_DIR(cmd) != _IOC_WRITE) {
591 retval = -EINVAL;
592 goto done;
593 }
594
595#ifdef DEBUG
596 if (arg == -10) {
597 usblp_dump(usblp);
598 break;
599 }
600#endif
601
602 usblp_unlink_urbs(usblp);
603 retval = usblp_set_protocol(usblp, arg);
604 if (retval < 0) {
605 usblp_set_protocol(usblp,
606 usblp->current_protocol);
607 }
608 break;
609
610 case IOCNR_HP_SET_CHANNEL:
611 if (_IOC_DIR(cmd) != _IOC_WRITE ||
612 le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
613 usblp->quirks & USBLP_QUIRK_BIDIR) {
614 retval = -EINVAL;
615 goto done;
616 }
617
618 err = usblp_hp_channel_change_request(usblp,
619 arg, &newChannel);
620 if (err < 0) {
621 dev_err(&usblp->dev->dev,
622 "usblp%d: error = %d setting "
623 "HP channel\n",
624 usblp->minor, err);
625 retval = -EIO;
626 goto done;
627 }
628
629 dev_dbg(&usblp->intf->dev,
630 "usblp%d requested/got HP channel %ld/%d\n",
631 usblp->minor, arg, newChannel);
632 break;
633
634 case IOCNR_GET_BUS_ADDRESS:
635 if (_IOC_DIR(cmd) != _IOC_READ ||
636 _IOC_SIZE(cmd) < sizeof(twoints)) {
637 retval = -EINVAL;
638 goto done;
639 }
640
641 twoints[0] = usblp->dev->bus->busnum;
642 twoints[1] = usblp->dev->devnum;
643 if (copy_to_user((void __user *)arg,
644 (unsigned char *)twoints,
645 sizeof(twoints))) {
646 retval = -EFAULT;
647 goto done;
648 }
649
650 dev_dbg(&usblp->intf->dev,
651 "usblp%d is bus=%d, device=%d\n",
652 usblp->minor, twoints[0], twoints[1]);
653 break;
654
655 case IOCNR_GET_VID_PID:
656 if (_IOC_DIR(cmd) != _IOC_READ ||
657 _IOC_SIZE(cmd) < sizeof(twoints)) {
658 retval = -EINVAL;
659 goto done;
660 }
661
662 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
663 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
664 if (copy_to_user((void __user *)arg,
665 (unsigned char *)twoints,
666 sizeof(twoints))) {
667 retval = -EFAULT;
668 goto done;
669 }
670
671 dev_dbg(&usblp->intf->dev,
672 "usblp%d is VID=0x%4.4X, PID=0x%4.4X\n",
673 usblp->minor, twoints[0], twoints[1]);
674 break;
675
676 case IOCNR_SOFT_RESET:
677 if (_IOC_DIR(cmd) != _IOC_NONE) {
678 retval = -EINVAL;
679 goto done;
680 }
681 retval = usblp_reset(usblp);
682 break;
683 default:
684 retval = -ENOTTY;
685 }
686 else
687 switch (cmd) {
688
689 case LPGETSTATUS:
690 retval = usblp_read_status(usblp, usblp->statusbuf);
691 if (retval) {
692 printk_ratelimited(KERN_ERR "usblp%d:"
693 "failed reading printer status (%d)\n",
694 usblp->minor, retval);
695 retval = -EIO;
696 goto done;
697 }
698 status = *usblp->statusbuf;
699 if (copy_to_user((void __user *)arg, &status, sizeof(int)))
700 retval = -EFAULT;
701 break;
702
703 case LPABORT:
704 if (arg)
705 usblp->flags |= LP_ABORT;
706 else
707 usblp->flags &= ~LP_ABORT;
708 break;
709
710 default:
711 retval = -ENOTTY;
712 }
713
714done:
715 mutex_unlock(&usblp->mut);
716 return retval;
717}
718
719static struct urb *usblp_new_writeurb(struct usblp *usblp, int transfer_length)
720{
721 struct urb *urb;
722 char *writebuf;
723
724 writebuf = kmalloc(transfer_length, GFP_KERNEL);
725 if (writebuf == NULL)
726 return NULL;
727 urb = usb_alloc_urb(0, GFP_KERNEL);
728 if (urb == NULL) {
729 kfree(writebuf);
730 return NULL;
731 }
732
733 usb_fill_bulk_urb(urb, usblp->dev,
734 usb_sndbulkpipe(usblp->dev,
735 usblp->protocol[usblp->current_protocol].epwrite->bEndpointAddress),
736 writebuf, transfer_length, usblp_bulk_write, usblp);
737 urb->transfer_flags |= URB_FREE_BUFFER;
738
739 return urb;
740}
741
742static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
743{
744 struct usblp *usblp = file->private_data;
745 struct urb *writeurb;
746 int rv;
747 int transfer_length;
748 ssize_t writecount = 0;
749
750 if (mutex_lock_interruptible(&usblp->wmut)) {
751 rv = -EINTR;
752 goto raise_biglock;
753 }
754 if ((rv = usblp_wwait(usblp, !!(file->f_flags & O_NONBLOCK))) < 0)
755 goto raise_wait;
756
757 while (writecount < count) {
758
759
760
761 if ((transfer_length = count - writecount) > USBLP_BUF_SIZE)
762 transfer_length = USBLP_BUF_SIZE;
763
764 rv = -ENOMEM;
765 writeurb = usblp_new_writeurb(usblp, transfer_length);
766 if (writeurb == NULL)
767 goto raise_urb;
768 usb_anchor_urb(writeurb, &usblp->urbs);
769
770 if (copy_from_user(writeurb->transfer_buffer,
771 buffer + writecount, transfer_length)) {
772 rv = -EFAULT;
773 goto raise_badaddr;
774 }
775
776 spin_lock_irq(&usblp->lock);
777 usblp->wcomplete = 0;
778 spin_unlock_irq(&usblp->lock);
779 if ((rv = usb_submit_urb(writeurb, GFP_KERNEL)) < 0) {
780 usblp->wstatus = 0;
781 spin_lock_irq(&usblp->lock);
782 usblp->no_paper = 0;
783 usblp->wcomplete = 1;
784 wake_up(&usblp->wwait);
785 spin_unlock_irq(&usblp->lock);
786 if (rv != -ENOMEM)
787 rv = -EIO;
788 goto raise_submit;
789 }
790
791
792
793
794 rv = usblp_wwait(usblp, !!(file->f_flags&O_NONBLOCK));
795 if (rv < 0) {
796 if (rv == -EAGAIN) {
797
798 writecount += transfer_length;
799 }
800 if (rv == -ENOSPC) {
801 spin_lock_irq(&usblp->lock);
802 usblp->no_paper = 1;
803 spin_unlock_irq(&usblp->lock);
804 writecount += transfer_length;
805 }
806
807 goto collect_error;
808 }
809
810 if (usblp->wstatus < 0) {
811 rv = -EIO;
812 goto collect_error;
813 }
814
815
816
817
818 writecount += usblp->wstatus;
819 }
820
821 mutex_unlock(&usblp->wmut);
822 return writecount;
823
824raise_submit:
825raise_badaddr:
826 usb_unanchor_urb(writeurb);
827 usb_free_urb(writeurb);
828raise_urb:
829raise_wait:
830collect_error:
831 mutex_unlock(&usblp->wmut);
832raise_biglock:
833 return writecount ? writecount : rv;
834}
835
836
837
838
839
840
841static ssize_t usblp_read(struct file *file, char __user *buffer, size_t len, loff_t *ppos)
842{
843 struct usblp *usblp = file->private_data;
844 ssize_t count;
845 ssize_t avail;
846 int rv;
847
848 if (!usblp->bidir)
849 return -EINVAL;
850
851 rv = usblp_rwait_and_lock(usblp, !!(file->f_flags & O_NONBLOCK));
852 if (rv < 0)
853 return rv;
854
855 if (!usblp->present) {
856 count = -ENODEV;
857 goto done;
858 }
859
860 if ((avail = usblp->rstatus) < 0) {
861 printk(KERN_ERR "usblp%d: error %d reading from printer\n",
862 usblp->minor, (int)avail);
863 usblp_submit_read(usblp);
864 count = -EIO;
865 goto done;
866 }
867
868 count = len < avail - usblp->readcount ? len : avail - usblp->readcount;
869 if (count != 0 &&
870 copy_to_user(buffer, usblp->readbuf + usblp->readcount, count)) {
871 count = -EFAULT;
872 goto done;
873 }
874
875 if ((usblp->readcount += count) == avail) {
876 if (usblp_submit_read(usblp) < 0) {
877
878 if (count == 0)
879 count = -EIO;
880 goto done;
881 }
882 }
883
884done:
885 mutex_unlock(&usblp->mut);
886 return count;
887}
888
889
890
891
892
893
894
895
896
897
898
899
900static int usblp_wwait(struct usblp *usblp, int nonblock)
901{
902 DECLARE_WAITQUEUE(waita, current);
903 int rc;
904 int err = 0;
905
906 add_wait_queue(&usblp->wwait, &waita);
907 for (;;) {
908 if (mutex_lock_interruptible(&usblp->mut)) {
909 rc = -EINTR;
910 break;
911 }
912 set_current_state(TASK_INTERRUPTIBLE);
913 rc = usblp_wtest(usblp, nonblock);
914 mutex_unlock(&usblp->mut);
915 if (rc <= 0)
916 break;
917
918 if (schedule_timeout(msecs_to_jiffies(1500)) == 0) {
919 if (usblp->flags & LP_ABORT) {
920 err = usblp_check_status(usblp, err);
921 if (err == 1) {
922 rc = -ENOSPC;
923 break;
924 }
925 } else {
926
927 mutex_lock(&usblp->mut);
928 usblp_read_status(usblp, usblp->statusbuf);
929 mutex_unlock(&usblp->mut);
930 }
931 }
932 }
933 set_current_state(TASK_RUNNING);
934 remove_wait_queue(&usblp->wwait, &waita);
935 return rc;
936}
937
938static int usblp_wtest(struct usblp *usblp, int nonblock)
939{
940 unsigned long flags;
941
942 if (!usblp->present)
943 return -ENODEV;
944 if (signal_pending(current))
945 return -EINTR;
946 spin_lock_irqsave(&usblp->lock, flags);
947 if (usblp->wcomplete) {
948 spin_unlock_irqrestore(&usblp->lock, flags);
949 return 0;
950 }
951 spin_unlock_irqrestore(&usblp->lock, flags);
952 if (nonblock)
953 return -EAGAIN;
954 return 1;
955}
956
957
958
959
960
961
962
963
964static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock)
965{
966 DECLARE_WAITQUEUE(waita, current);
967 int rc;
968
969 add_wait_queue(&usblp->rwait, &waita);
970 for (;;) {
971 if (mutex_lock_interruptible(&usblp->mut)) {
972 rc = -EINTR;
973 break;
974 }
975 set_current_state(TASK_INTERRUPTIBLE);
976 if ((rc = usblp_rtest(usblp, nonblock)) < 0) {
977 mutex_unlock(&usblp->mut);
978 break;
979 }
980 if (rc == 0)
981 break;
982 mutex_unlock(&usblp->mut);
983 schedule();
984 }
985 set_current_state(TASK_RUNNING);
986 remove_wait_queue(&usblp->rwait, &waita);
987 return rc;
988}
989
990static int usblp_rtest(struct usblp *usblp, int nonblock)
991{
992 unsigned long flags;
993
994 if (!usblp->present)
995 return -ENODEV;
996 if (signal_pending(current))
997 return -EINTR;
998 spin_lock_irqsave(&usblp->lock, flags);
999 if (usblp->rcomplete) {
1000 spin_unlock_irqrestore(&usblp->lock, flags);
1001 return 0;
1002 }
1003 spin_unlock_irqrestore(&usblp->lock, flags);
1004 if (nonblock)
1005 return -EAGAIN;
1006 return 1;
1007}
1008
1009
1010
1011
1012static int usblp_submit_read(struct usblp *usblp)
1013{
1014 struct urb *urb;
1015 unsigned long flags;
1016 int rc;
1017
1018 rc = -ENOMEM;
1019 urb = usb_alloc_urb(0, GFP_KERNEL);
1020 if (urb == NULL)
1021 goto raise_urb;
1022
1023 usb_fill_bulk_urb(urb, usblp->dev,
1024 usb_rcvbulkpipe(usblp->dev,
1025 usblp->protocol[usblp->current_protocol].epread->bEndpointAddress),
1026 usblp->readbuf, USBLP_BUF_SIZE_IN,
1027 usblp_bulk_read, usblp);
1028 usb_anchor_urb(urb, &usblp->urbs);
1029
1030 spin_lock_irqsave(&usblp->lock, flags);
1031 usblp->readcount = 0;
1032 usblp->rcomplete = 0;
1033 spin_unlock_irqrestore(&usblp->lock, flags);
1034 if ((rc = usb_submit_urb(urb, GFP_KERNEL)) < 0) {
1035 dev_dbg(&usblp->intf->dev, "error submitting urb (%d)\n", rc);
1036 spin_lock_irqsave(&usblp->lock, flags);
1037 usblp->rstatus = rc;
1038 usblp->rcomplete = 1;
1039 spin_unlock_irqrestore(&usblp->lock, flags);
1040 goto raise_submit;
1041 }
1042
1043 return 0;
1044
1045raise_submit:
1046 usb_unanchor_urb(urb);
1047 usb_free_urb(urb);
1048raise_urb:
1049 return rc;
1050}
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069static unsigned int usblp_quirks(__u16 vendor, __u16 product)
1070{
1071 int i;
1072
1073 for (i = 0; quirk_printers[i].vendorId; i++) {
1074 if (vendor == quirk_printers[i].vendorId &&
1075 product == quirk_printers[i].productId)
1076 return quirk_printers[i].quirks;
1077 }
1078 return 0;
1079}
1080
1081static const struct file_operations usblp_fops = {
1082 .owner = THIS_MODULE,
1083 .read = usblp_read,
1084 .write = usblp_write,
1085 .poll = usblp_poll,
1086 .unlocked_ioctl = usblp_ioctl,
1087 .compat_ioctl = usblp_ioctl,
1088 .open = usblp_open,
1089 .release = usblp_release,
1090 .llseek = noop_llseek,
1091};
1092
1093static char *usblp_devnode(struct device *dev, umode_t *mode)
1094{
1095 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
1096}
1097
1098static struct usb_class_driver usblp_class = {
1099 .name = "lp%d",
1100 .devnode = usblp_devnode,
1101 .fops = &usblp_fops,
1102 .minor_base = USBLP_MINOR_BASE,
1103};
1104
1105static ssize_t ieee1284_id_show(struct device *dev, struct device_attribute *attr, char *buf)
1106{
1107 struct usb_interface *intf = to_usb_interface(dev);
1108 struct usblp *usblp = usb_get_intfdata(intf);
1109
1110 if (usblp->device_id_string[0] == 0 &&
1111 usblp->device_id_string[1] == 0)
1112 return 0;
1113
1114 return sprintf(buf, "%s", usblp->device_id_string+2);
1115}
1116
1117static DEVICE_ATTR_RO(ieee1284_id);
1118
1119static struct attribute *usblp_attrs[] = {
1120 &dev_attr_ieee1284_id.attr,
1121 NULL,
1122};
1123ATTRIBUTE_GROUPS(usblp);
1124
1125static int usblp_probe(struct usb_interface *intf,
1126 const struct usb_device_id *id)
1127{
1128 struct usb_device *dev = interface_to_usbdev(intf);
1129 struct usblp *usblp;
1130 int protocol;
1131 int retval;
1132
1133
1134
1135 usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL);
1136 if (!usblp) {
1137 retval = -ENOMEM;
1138 goto abort_ret;
1139 }
1140 usblp->dev = dev;
1141 mutex_init(&usblp->wmut);
1142 mutex_init(&usblp->mut);
1143 spin_lock_init(&usblp->lock);
1144 init_waitqueue_head(&usblp->rwait);
1145 init_waitqueue_head(&usblp->wwait);
1146 init_usb_anchor(&usblp->urbs);
1147 usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
1148 usblp->intf = usb_get_intf(intf);
1149
1150
1151
1152
1153 if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
1154 retval = -ENOMEM;
1155 goto abort;
1156 }
1157
1158
1159
1160
1161
1162
1163 if (!(usblp->readbuf = kmalloc(USBLP_BUF_SIZE_IN, GFP_KERNEL))) {
1164 retval = -ENOMEM;
1165 goto abort;
1166 }
1167
1168
1169 usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
1170 if (!usblp->statusbuf) {
1171 retval = -ENOMEM;
1172 goto abort;
1173 }
1174
1175
1176 usblp->quirks = usblp_quirks(
1177 le16_to_cpu(dev->descriptor.idVendor),
1178 le16_to_cpu(dev->descriptor.idProduct));
1179
1180
1181 protocol = usblp_select_alts(usblp);
1182 if (protocol < 0) {
1183 dev_dbg(&intf->dev,
1184 "incompatible printer-class device 0x%4.4X/0x%4.4X\n",
1185 le16_to_cpu(dev->descriptor.idVendor),
1186 le16_to_cpu(dev->descriptor.idProduct));
1187 retval = -ENODEV;
1188 goto abort;
1189 }
1190
1191
1192 if (usblp_set_protocol(usblp, protocol) < 0) {
1193 retval = -ENODEV;
1194 goto abort;
1195 }
1196
1197
1198 usblp_cache_device_id_string(usblp);
1199
1200#ifdef DEBUG
1201 usblp_check_status(usblp, 0);
1202#endif
1203
1204 usb_set_intfdata(intf, usblp);
1205
1206 usblp->present = 1;
1207
1208 retval = usb_register_dev(intf, &usblp_class);
1209 if (retval) {
1210 dev_err(&intf->dev,
1211 "usblp: Not able to get a minor (base %u, slice default): %d\n",
1212 USBLP_MINOR_BASE, retval);
1213 goto abort_intfdata;
1214 }
1215 usblp->minor = intf->minor;
1216 dev_info(&intf->dev,
1217 "usblp%d: USB %sdirectional printer dev %d if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X\n",
1218 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
1219 usblp->ifnum,
1220 usblp->protocol[usblp->current_protocol].alt_setting,
1221 usblp->current_protocol,
1222 le16_to_cpu(usblp->dev->descriptor.idVendor),
1223 le16_to_cpu(usblp->dev->descriptor.idProduct));
1224
1225 return 0;
1226
1227abort_intfdata:
1228 usb_set_intfdata(intf, NULL);
1229abort:
1230 kfree(usblp->readbuf);
1231 kfree(usblp->statusbuf);
1232 kfree(usblp->device_id_string);
1233 usb_put_intf(usblp->intf);
1234 kfree(usblp);
1235abort_ret:
1236 return retval;
1237}
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262static int usblp_select_alts(struct usblp *usblp)
1263{
1264 struct usb_interface *if_alt;
1265 struct usb_host_interface *ifd;
1266 struct usb_endpoint_descriptor *epwrite, *epread;
1267 int p, i;
1268 int res;
1269
1270 if_alt = usblp->intf;
1271
1272 for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1273 usblp->protocol[p].alt_setting = -1;
1274
1275
1276 for (i = 0; i < if_alt->num_altsetting; i++) {
1277 ifd = &if_alt->altsetting[i];
1278
1279 if (ifd->desc.bInterfaceClass != USB_CLASS_PRINTER ||
1280 ifd->desc.bInterfaceSubClass != 1)
1281 if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS))
1282 continue;
1283
1284 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1285 ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1286 continue;
1287
1288
1289 if (ifd->desc.bInterfaceProtocol > 1) {
1290 res = usb_find_common_endpoints(ifd,
1291 &epread, &epwrite, NULL, NULL);
1292 } else {
1293 epread = NULL;
1294 res = usb_find_bulk_out_endpoint(ifd, &epwrite);
1295 }
1296
1297
1298 if (res)
1299 continue;
1300
1301
1302 if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1303 printk(KERN_INFO "usblp%d: Disabling reads from "
1304 "problematic bidirectional printer\n",
1305 usblp->minor);
1306 epread = NULL;
1307 }
1308
1309 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1310 ifd->desc.bAlternateSetting;
1311 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1312 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1313 }
1314
1315
1316 if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1317 proto_bias <= USBLP_LAST_PROTOCOL &&
1318 usblp->protocol[proto_bias].alt_setting != -1)
1319 return proto_bias;
1320
1321
1322 if (usblp->protocol[2].alt_setting != -1)
1323 return 2;
1324 if (usblp->protocol[1].alt_setting != -1)
1325 return 1;
1326 if (usblp->protocol[3].alt_setting != -1)
1327 return 3;
1328
1329
1330 return -1;
1331}
1332
1333static int usblp_set_protocol(struct usblp *usblp, int protocol)
1334{
1335 int r, alts;
1336
1337 if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1338 return -EINVAL;
1339
1340
1341 if (usblp->intf->num_altsetting > 1) {
1342 alts = usblp->protocol[protocol].alt_setting;
1343 if (alts < 0)
1344 return -EINVAL;
1345 r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1346 if (r < 0) {
1347 printk(KERN_ERR "usblp: can't set desired altsetting %d on interface %d\n",
1348 alts, usblp->ifnum);
1349 return r;
1350 }
1351 }
1352
1353 usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1354 usblp->current_protocol = protocol;
1355 dev_dbg(&usblp->intf->dev, "usblp%d set protocol %d\n",
1356 usblp->minor, protocol);
1357 return 0;
1358}
1359
1360
1361
1362
1363static int usblp_cache_device_id_string(struct usblp *usblp)
1364{
1365 int err, length;
1366
1367 err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1368 if (err < 0) {
1369 dev_dbg(&usblp->intf->dev,
1370 "usblp%d: error = %d reading IEEE-1284 Device ID string\n",
1371 usblp->minor, err);
1372 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1373 return -EIO;
1374 }
1375
1376
1377
1378
1379 length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1380 if (length < 2)
1381 length = 2;
1382 else if (length >= USBLP_DEVICE_ID_SIZE)
1383 length = USBLP_DEVICE_ID_SIZE - 1;
1384 usblp->device_id_string[length] = '\0';
1385
1386 dev_dbg(&usblp->intf->dev, "usblp%d Device ID string [len=%d]=\"%s\"\n",
1387 usblp->minor, length, &usblp->device_id_string[2]);
1388
1389 return length;
1390}
1391
1392static void usblp_disconnect(struct usb_interface *intf)
1393{
1394 struct usblp *usblp = usb_get_intfdata(intf);
1395
1396 usb_deregister_dev(intf, &usblp_class);
1397
1398 if (!usblp || !usblp->dev) {
1399 dev_err(&intf->dev, "bogus disconnect\n");
1400 BUG();
1401 }
1402
1403 mutex_lock(&usblp_mutex);
1404 mutex_lock(&usblp->mut);
1405 usblp->present = 0;
1406 wake_up(&usblp->wwait);
1407 wake_up(&usblp->rwait);
1408 usb_set_intfdata(intf, NULL);
1409
1410 usblp_unlink_urbs(usblp);
1411 mutex_unlock(&usblp->mut);
1412 usb_poison_anchored_urbs(&usblp->urbs);
1413
1414 if (!usblp->used)
1415 usblp_cleanup(usblp);
1416
1417 mutex_unlock(&usblp_mutex);
1418}
1419
1420static int usblp_suspend(struct usb_interface *intf, pm_message_t message)
1421{
1422 struct usblp *usblp = usb_get_intfdata(intf);
1423
1424 usblp_unlink_urbs(usblp);
1425#if 0
1426
1427 wake_up(&usblp->wwait);
1428 wake_up(&usblp->rwait);
1429#endif
1430
1431 return 0;
1432}
1433
1434static int usblp_resume(struct usb_interface *intf)
1435{
1436 struct usblp *usblp = usb_get_intfdata(intf);
1437 int r;
1438
1439 r = handle_bidir(usblp);
1440
1441 return r;
1442}
1443
1444static const struct usb_device_id usblp_ids[] = {
1445 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 1) },
1446 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 2) },
1447 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 3) },
1448 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 1) },
1449 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 2) },
1450 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 3) },
1451 { USB_DEVICE(0x04b8, 0x0202) },
1452 { }
1453};
1454
1455MODULE_DEVICE_TABLE(usb, usblp_ids);
1456
1457static struct usb_driver usblp_driver = {
1458 .name = "usblp",
1459 .probe = usblp_probe,
1460 .disconnect = usblp_disconnect,
1461 .suspend = usblp_suspend,
1462 .resume = usblp_resume,
1463 .id_table = usblp_ids,
1464 .dev_groups = usblp_groups,
1465 .supports_autosuspend = 1,
1466};
1467
1468module_usb_driver(usblp_driver);
1469
1470MODULE_AUTHOR(DRIVER_AUTHOR);
1471MODULE_DESCRIPTION(DRIVER_DESC);
1472module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1473MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1474MODULE_LICENSE("GPL");
1475