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USB: usblp: fix runtime PM after driver unbind
[mirror_ubuntu-bionic-kernel.git] / drivers / usb / class / usblp.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * usblp.c
4 *
5 * Copyright (c) 1999 Michael Gee <michael@linuxspecific.com>
6 * Copyright (c) 1999 Pavel Machek <pavel@ucw.cz>
7 * Copyright (c) 2000 Randy Dunlap <rdunlap@xenotime.net>
8 * Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz>
9 # Copyright (c) 2001 Pete Zaitcev <zaitcev@redhat.com>
10 # Copyright (c) 2001 David Paschal <paschal@rcsis.com>
11 * Copyright (c) 2006 Oliver Neukum <oliver@neukum.name>
12 *
13 * USB Printer Device Class driver for USB printers and printer cables
14 *
15 * Sponsored by SuSE
16 *
17 * ChangeLog:
18 * v0.1 - thorough cleaning, URBification, almost a rewrite
19 * v0.2 - some more cleanups
20 * v0.3 - cleaner again, waitqueue fixes
21 * v0.4 - fixes in unidirectional mode
22 * v0.5 - add DEVICE_ID string support
23 * v0.6 - never time out
24 * v0.7 - fixed bulk-IN read and poll (David Paschal)
25 * v0.8 - add devfs support
26 * v0.9 - fix unplug-while-open paths
27 * v0.10- remove sleep_on, fix error on oom (oliver@neukum.org)
28 * v0.11 - add proto_bias option (Pete Zaitcev)
29 * v0.12 - add hpoj.sourceforge.net ioctls (David Paschal)
30 * v0.13 - alloc space for statusbuf (<status> not on stack);
31 * use usb_alloc_coherent() for read buf & write buf;
32 * none - Maintained in Linux kernel after v0.13
33 */
34
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 * Version Information
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 /* ioctls: */
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 /* Get device_id string: */
67 #define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len)
68 /* The following ioctls were added for http://hpoj.sourceforge.net:
69 * Get two-int array:
70 * [0]=current protocol
71 * (1=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2,
72 * 3=USB_CLASS_PRINTER/1/3),
73 * [1]=supported protocol mask (mask&(1<<n)!=0 means
74 * USB_CLASS_PRINTER/1/n supported):
75 */
76 #define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
77 /*
78 * Set protocol
79 * (arg: 1=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2,
80 * 3=USB_CLASS_PRINTER/1/3):
81 */
82 #define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0)
83 /* Set channel number (HP Vendor-specific command): */
84 #define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0)
85 /* Get two-int array: [0]=bus number, [1]=device address: */
86 #define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len)
87 /* Get two-int array: [0]=vendor ID, [1]=product ID: */
88 #define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len)
89 /* Perform class specific soft reset */
90 #define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0);
91
92 /*
93 * A DEVICE_ID string may include the printer's serial number.
94 * It should end with a semi-colon (';').
95 * An example from an HP 970C DeskJet printer is (this is one long string,
96 * with the serial number changed):
97 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: ;
98 */
99
100 /*
101 * USB Printer Requests
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 /* HP Vendor-specific */
108
109 #define USBLP_MINORS 16
110 #define USBLP_MINOR_BASE 0
111
112 #define USBLP_CTL_TIMEOUT 5000 /* 5 seconds */
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 * some arbitrary status buffer size;
120 * need a status buffer that is allocated via kmalloc(), not on stack
121 */
122 #define STATUS_BUF_SIZE 8
123
124 /*
125 * Locks down the locking order:
126 * ->wmut locks wstatus.
127 * ->mut locks the whole usblp, except [rw]complete, and thus, by indirection,
128 * [rw]status. We only touch status when we know the side idle.
129 * ->lock locks what interrupt accesses.
130 */
131 struct usblp {
132 struct usb_device *dev; /* USB device */
133 struct mutex wmut;
134 struct mutex mut;
135 spinlock_t lock; /* locks rcomplete, wcomplete */
136 char *readbuf; /* read transfer_buffer */
137 char *statusbuf; /* status transfer_buffer */
138 struct usb_anchor urbs;
139 wait_queue_head_t rwait, wwait;
140 int readcount; /* Counter for reads */
141 int ifnum; /* Interface number */
142 struct usb_interface *intf; /* The interface */
143 /*
144 * Alternate-setting numbers and endpoints for each protocol
145 * (USB_CLASS_PRINTER/1/{index=1,2,3}) that the device supports:
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; /* minor number of device */
154 int wcomplete, rcomplete;
155 int wstatus; /* bytes written or error */
156 int rstatus; /* bytes ready or error */
157 unsigned int quirks; /* quirks flags */
158 unsigned int flags; /* mode flags */
159 unsigned char used; /* True if open */
160 unsigned char present; /* True if not disconnected */
161 unsigned char bidir; /* interface is bidirectional */
162 unsigned char no_paper; /* Paper Out happened */
163 unsigned char *device_id_string; /* IEEE 1284 DEVICE ID string (ptr) */
164 /* first 2 bytes are (big-endian) length */
165 };
166
167 #ifdef DEBUG
168 static 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 /* Quirks: various printer quirks are handled by this table & its flags. */
202
203 struct quirk_printer_struct {
204 __u16 vendorId;
205 __u16 productId;
206 unsigned int quirks;
207 };
208
209 #define USBLP_QUIRK_BIDIR 0x1 /* reports bidir but requires unidirectional mode (no INs/reads) */
210 #define USBLP_QUIRK_USB_INIT 0x2 /* needs vendor USB init string */
211 #define USBLP_QUIRK_BAD_CLASS 0x4 /* descriptor uses vendor-specific Class or SubClass */
212
213 static const struct quirk_printer_struct quirk_printers[] = {
214 { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
215 { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
216 { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
217 { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
218 { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
219 { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
220 { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */
221 { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */
222 { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
223 { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
224 { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
225 { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
226 { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
227 { 0x0482, 0x0010, USBLP_QUIRK_BIDIR }, /* Kyocera Mita FS 820, by zut <kernel@zut.de> */
228 { 0x04f9, 0x000d, USBLP_QUIRK_BIDIR }, /* Brother Industries, Ltd HL-1440 Laser Printer */
229 { 0x04b8, 0x0202, USBLP_QUIRK_BAD_CLASS }, /* Seiko Epson Receipt Printer M129C */
230 { 0, 0 }
231 };
232
233 static int usblp_wwait(struct usblp *usblp, int nonblock);
234 static int usblp_wtest(struct usblp *usblp, int nonblock);
235 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock);
236 static int usblp_rtest(struct usblp *usblp, int nonblock);
237 static int usblp_submit_read(struct usblp *usblp);
238 static int usblp_select_alts(struct usblp *usblp);
239 static int usblp_set_protocol(struct usblp *usblp, int protocol);
240 static int usblp_cache_device_id_string(struct usblp *usblp);
241
242 /* forward reference to make our lives easier */
243 static struct usb_driver usblp_driver;
244 static DEFINE_MUTEX(usblp_mutex); /* locks the existence of usblp's */
245
246 /*
247 * Functions for usblp control messages.
248 */
249
250 static 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 /* High byte has the interface index.
256 Low byte has the alternate setting.
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
277 #define usblp_hp_channel_change_request(usblp, channel, buffer) \
278 usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
279
280 /*
281 * See the description for usblp_select_alts() below for the usage
282 * explanation. Look into your /sys/kernel/debug/usb/devices and dmesg in
283 * case of any trouble.
284 */
285 static int proto_bias = -1;
286
287 /*
288 * URB callback.
289 */
290
291 static void usblp_bulk_read(struct urb *urb)
292 {
293 struct usblp *usblp = urb->context;
294 int status = urb->status;
295
296 if (usblp->present && usblp->used) {
297 if (status)
298 printk(KERN_WARNING "usblp%d: "
299 "nonzero read bulk status received: %d\n",
300 usblp->minor, status);
301 }
302 spin_lock(&usblp->lock);
303 if (status < 0)
304 usblp->rstatus = status;
305 else
306 usblp->rstatus = urb->actual_length;
307 usblp->rcomplete = 1;
308 wake_up(&usblp->rwait);
309 spin_unlock(&usblp->lock);
310
311 usb_free_urb(urb);
312 }
313
314 static void usblp_bulk_write(struct urb *urb)
315 {
316 struct usblp *usblp = urb->context;
317 int status = urb->status;
318
319 if (usblp->present && usblp->used) {
320 if (status)
321 printk(KERN_WARNING "usblp%d: "
322 "nonzero write bulk status received: %d\n",
323 usblp->minor, status);
324 }
325 spin_lock(&usblp->lock);
326 if (status < 0)
327 usblp->wstatus = status;
328 else
329 usblp->wstatus = urb->actual_length;
330 usblp->no_paper = 0;
331 usblp->wcomplete = 1;
332 wake_up(&usblp->wwait);
333 spin_unlock(&usblp->lock);
334
335 usb_free_urb(urb);
336 }
337
338 /*
339 * Get and print printer errors.
340 */
341
342 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
343
344 static int usblp_check_status(struct usblp *usblp, int err)
345 {
346 unsigned char status, newerr = 0;
347 int error;
348
349 mutex_lock(&usblp->mut);
350 if ((error = usblp_read_status(usblp, usblp->statusbuf)) < 0) {
351 mutex_unlock(&usblp->mut);
352 printk_ratelimited(KERN_ERR
353 "usblp%d: error %d reading printer status\n",
354 usblp->minor, error);
355 return 0;
356 }
357 status = *usblp->statusbuf;
358 mutex_unlock(&usblp->mut);
359
360 if (~status & LP_PERRORP)
361 newerr = 3;
362 if (status & LP_POUTPA)
363 newerr = 1;
364 if (~status & LP_PSELECD)
365 newerr = 2;
366
367 if (newerr != err) {
368 printk(KERN_INFO "usblp%d: %s\n",
369 usblp->minor, usblp_messages[newerr]);
370 }
371
372 return newerr;
373 }
374
375 static int handle_bidir(struct usblp *usblp)
376 {
377 if (usblp->bidir && usblp->used) {
378 if (usblp_submit_read(usblp) < 0)
379 return -EIO;
380 }
381 return 0;
382 }
383
384 /*
385 * File op functions.
386 */
387
388 static int usblp_open(struct inode *inode, struct file *file)
389 {
390 int minor = iminor(inode);
391 struct usblp *usblp;
392 struct usb_interface *intf;
393 int retval;
394
395 if (minor < 0)
396 return -ENODEV;
397
398 mutex_lock(&usblp_mutex);
399
400 retval = -ENODEV;
401 intf = usb_find_interface(&usblp_driver, minor);
402 if (!intf)
403 goto out;
404 usblp = usb_get_intfdata(intf);
405 if (!usblp || !usblp->dev || !usblp->present)
406 goto out;
407
408 retval = -EBUSY;
409 if (usblp->used)
410 goto out;
411
412 /*
413 * We do not implement LP_ABORTOPEN/LPABORTOPEN for two reasons:
414 * - We do not want persistent state which close(2) does not clear
415 * - It is not used anyway, according to CUPS people
416 */
417
418 retval = usb_autopm_get_interface(intf);
419 if (retval < 0)
420 goto out;
421 usblp->used = 1;
422 file->private_data = usblp;
423
424 usblp->wcomplete = 1; /* we begin writeable */
425 usblp->wstatus = 0;
426 usblp->rcomplete = 0;
427
428 if (handle_bidir(usblp) < 0) {
429 usb_autopm_put_interface(intf);
430 usblp->used = 0;
431 file->private_data = NULL;
432 retval = -EIO;
433 }
434 out:
435 mutex_unlock(&usblp_mutex);
436 return retval;
437 }
438
439 static void usblp_cleanup(struct usblp *usblp)
440 {
441 printk(KERN_INFO "usblp%d: removed\n", usblp->minor);
442
443 kfree(usblp->readbuf);
444 kfree(usblp->device_id_string);
445 kfree(usblp->statusbuf);
446 kfree(usblp);
447 }
448
449 static void usblp_unlink_urbs(struct usblp *usblp)
450 {
451 usb_kill_anchored_urbs(&usblp->urbs);
452 }
453
454 static int usblp_release(struct inode *inode, struct file *file)
455 {
456 struct usblp *usblp = file->private_data;
457
458 usblp->flags &= ~LP_ABORT;
459
460 mutex_lock(&usblp_mutex);
461 usblp->used = 0;
462 if (usblp->present)
463 usblp_unlink_urbs(usblp);
464
465 usb_autopm_put_interface(usblp->intf);
466
467 if (!usblp->present) /* finish cleanup from disconnect */
468 usblp_cleanup(usblp);
469 mutex_unlock(&usblp_mutex);
470 return 0;
471 }
472
473 /* No kernel lock - fine */
474 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
475 {
476 int ret;
477 unsigned long flags;
478
479 struct usblp *usblp = file->private_data;
480 /* Should we check file->f_mode & FMODE_WRITE before poll_wait()? */
481 poll_wait(file, &usblp->rwait, wait);
482 poll_wait(file, &usblp->wwait, wait);
483 spin_lock_irqsave(&usblp->lock, flags);
484 ret = ((usblp->bidir && usblp->rcomplete) ? POLLIN | POLLRDNORM : 0) |
485 ((usblp->no_paper || usblp->wcomplete) ? POLLOUT | POLLWRNORM : 0);
486 spin_unlock_irqrestore(&usblp->lock, flags);
487 return ret;
488 }
489
490 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
491 {
492 struct usblp *usblp = file->private_data;
493 int length, err, i;
494 unsigned char newChannel;
495 int status;
496 int twoints[2];
497 int retval = 0;
498
499 mutex_lock(&usblp->mut);
500 if (!usblp->present) {
501 retval = -ENODEV;
502 goto done;
503 }
504
505 dev_dbg(&usblp->intf->dev,
506 "usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)\n", cmd,
507 _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd));
508
509 if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */
510
511 switch (_IOC_NR(cmd)) {
512
513 case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
514 if (_IOC_DIR(cmd) != _IOC_READ) {
515 retval = -EINVAL;
516 goto done;
517 }
518
519 length = usblp_cache_device_id_string(usblp);
520 if (length < 0) {
521 retval = length;
522 goto done;
523 }
524 if (length > _IOC_SIZE(cmd))
525 length = _IOC_SIZE(cmd); /* truncate */
526
527 if (copy_to_user((void __user *) arg,
528 usblp->device_id_string,
529 (unsigned long) length)) {
530 retval = -EFAULT;
531 goto done;
532 }
533
534 break;
535
536 case IOCNR_GET_PROTOCOLS:
537 if (_IOC_DIR(cmd) != _IOC_READ ||
538 _IOC_SIZE(cmd) < sizeof(twoints)) {
539 retval = -EINVAL;
540 goto done;
541 }
542
543 twoints[0] = usblp->current_protocol;
544 twoints[1] = 0;
545 for (i = USBLP_FIRST_PROTOCOL;
546 i <= USBLP_LAST_PROTOCOL; i++) {
547 if (usblp->protocol[i].alt_setting >= 0)
548 twoints[1] |= (1<<i);
549 }
550
551 if (copy_to_user((void __user *)arg,
552 (unsigned char *)twoints,
553 sizeof(twoints))) {
554 retval = -EFAULT;
555 goto done;
556 }
557
558 break;
559
560 case IOCNR_SET_PROTOCOL:
561 if (_IOC_DIR(cmd) != _IOC_WRITE) {
562 retval = -EINVAL;
563 goto done;
564 }
565
566 #ifdef DEBUG
567 if (arg == -10) {
568 usblp_dump(usblp);
569 break;
570 }
571 #endif
572
573 usblp_unlink_urbs(usblp);
574 retval = usblp_set_protocol(usblp, arg);
575 if (retval < 0) {
576 usblp_set_protocol(usblp,
577 usblp->current_protocol);
578 }
579 break;
580
581 case IOCNR_HP_SET_CHANNEL:
582 if (_IOC_DIR(cmd) != _IOC_WRITE ||
583 le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
584 usblp->quirks & USBLP_QUIRK_BIDIR) {
585 retval = -EINVAL;
586 goto done;
587 }
588
589 err = usblp_hp_channel_change_request(usblp,
590 arg, &newChannel);
591 if (err < 0) {
592 dev_err(&usblp->dev->dev,
593 "usblp%d: error = %d setting "
594 "HP channel\n",
595 usblp->minor, err);
596 retval = -EIO;
597 goto done;
598 }
599
600 dev_dbg(&usblp->intf->dev,
601 "usblp%d requested/got HP channel %ld/%d\n",
602 usblp->minor, arg, newChannel);
603 break;
604
605 case IOCNR_GET_BUS_ADDRESS:
606 if (_IOC_DIR(cmd) != _IOC_READ ||
607 _IOC_SIZE(cmd) < sizeof(twoints)) {
608 retval = -EINVAL;
609 goto done;
610 }
611
612 twoints[0] = usblp->dev->bus->busnum;
613 twoints[1] = usblp->dev->devnum;
614 if (copy_to_user((void __user *)arg,
615 (unsigned char *)twoints,
616 sizeof(twoints))) {
617 retval = -EFAULT;
618 goto done;
619 }
620
621 dev_dbg(&usblp->intf->dev,
622 "usblp%d is bus=%d, device=%d\n",
623 usblp->minor, twoints[0], twoints[1]);
624 break;
625
626 case IOCNR_GET_VID_PID:
627 if (_IOC_DIR(cmd) != _IOC_READ ||
628 _IOC_SIZE(cmd) < sizeof(twoints)) {
629 retval = -EINVAL;
630 goto done;
631 }
632
633 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
634 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
635 if (copy_to_user((void __user *)arg,
636 (unsigned char *)twoints,
637 sizeof(twoints))) {
638 retval = -EFAULT;
639 goto done;
640 }
641
642 dev_dbg(&usblp->intf->dev,
643 "usblp%d is VID=0x%4.4X, PID=0x%4.4X\n",
644 usblp->minor, twoints[0], twoints[1]);
645 break;
646
647 case IOCNR_SOFT_RESET:
648 if (_IOC_DIR(cmd) != _IOC_NONE) {
649 retval = -EINVAL;
650 goto done;
651 }
652 retval = usblp_reset(usblp);
653 break;
654 default:
655 retval = -ENOTTY;
656 }
657 else /* old-style ioctl value */
658 switch (cmd) {
659
660 case LPGETSTATUS:
661 retval = usblp_read_status(usblp, usblp->statusbuf);
662 if (retval) {
663 printk_ratelimited(KERN_ERR "usblp%d:"
664 "failed reading printer status (%d)\n",
665 usblp->minor, retval);
666 retval = -EIO;
667 goto done;
668 }
669 status = *usblp->statusbuf;
670 if (copy_to_user((void __user *)arg, &status, sizeof(int)))
671 retval = -EFAULT;
672 break;
673
674 case LPABORT:
675 if (arg)
676 usblp->flags |= LP_ABORT;
677 else
678 usblp->flags &= ~LP_ABORT;
679 break;
680
681 default:
682 retval = -ENOTTY;
683 }
684
685 done:
686 mutex_unlock(&usblp->mut);
687 return retval;
688 }
689
690 static struct urb *usblp_new_writeurb(struct usblp *usblp, int transfer_length)
691 {
692 struct urb *urb;
693 char *writebuf;
694
695 writebuf = kmalloc(transfer_length, GFP_KERNEL);
696 if (writebuf == NULL)
697 return NULL;
698 urb = usb_alloc_urb(0, GFP_KERNEL);
699 if (urb == 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 writeurb = usblp_new_writeurb(usblp, transfer_length);
737 if (writeurb == NULL)
738 goto raise_urb;
739 usb_anchor_urb(writeurb, &usblp->urbs);
740
741 if (copy_from_user(writeurb->transfer_buffer,
742 buffer + writecount, transfer_length)) {
743 rv = -EFAULT;
744 goto raise_badaddr;
745 }
746
747 spin_lock_irq(&usblp->lock);
748 usblp->wcomplete = 0;
749 spin_unlock_irq(&usblp->lock);
750 if ((rv = usb_submit_urb(writeurb, GFP_KERNEL)) < 0) {
751 usblp->wstatus = 0;
752 spin_lock_irq(&usblp->lock);
753 usblp->no_paper = 0;
754 usblp->wcomplete = 1;
755 wake_up(&usblp->wwait);
756 spin_unlock_irq(&usblp->lock);
757 if (rv != -ENOMEM)
758 rv = -EIO;
759 goto raise_submit;
760 }
761
762 /*
763 * Step 2: Wait for transfer to end, collect results.
764 */
765 rv = usblp_wwait(usblp, !!(file->f_flags&O_NONBLOCK));
766 if (rv < 0) {
767 if (rv == -EAGAIN) {
768 /* Presume that it's going to complete well. */
769 writecount += transfer_length;
770 }
771 if (rv == -ENOSPC) {
772 spin_lock_irq(&usblp->lock);
773 usblp->no_paper = 1; /* Mark for poll(2) */
774 spin_unlock_irq(&usblp->lock);
775 writecount += transfer_length;
776 }
777 /* Leave URB dangling, to be cleaned on close. */
778 goto collect_error;
779 }
780
781 if (usblp->wstatus < 0) {
782 rv = -EIO;
783 goto collect_error;
784 }
785 /*
786 * This is critical: it must be our URB, not other writer's.
787 * The wmut exists mainly to cover us here.
788 */
789 writecount += usblp->wstatus;
790 }
791
792 mutex_unlock(&usblp->wmut);
793 return writecount;
794
795 raise_submit:
796 raise_badaddr:
797 usb_unanchor_urb(writeurb);
798 usb_free_urb(writeurb);
799 raise_urb:
800 raise_wait:
801 collect_error: /* Out of raise sequence */
802 mutex_unlock(&usblp->wmut);
803 raise_biglock:
804 return writecount ? writecount : rv;
805 }
806
807 /*
808 * Notice that we fail to restart in a few cases: on EFAULT, on restart
809 * error, etc. This is the historical behaviour. In all such cases we return
810 * EIO, and applications loop in order to get the new read going.
811 */
812 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t len, loff_t *ppos)
813 {
814 struct usblp *usblp = file->private_data;
815 ssize_t count;
816 ssize_t avail;
817 int rv;
818
819 if (!usblp->bidir)
820 return -EINVAL;
821
822 rv = usblp_rwait_and_lock(usblp, !!(file->f_flags & O_NONBLOCK));
823 if (rv < 0)
824 return rv;
825
826 if ((avail = usblp->rstatus) < 0) {
827 printk(KERN_ERR "usblp%d: error %d reading from printer\n",
828 usblp->minor, (int)avail);
829 usblp_submit_read(usblp);
830 count = -EIO;
831 goto done;
832 }
833
834 count = len < avail - usblp->readcount ? len : avail - usblp->readcount;
835 if (count != 0 &&
836 copy_to_user(buffer, usblp->readbuf + usblp->readcount, count)) {
837 count = -EFAULT;
838 goto done;
839 }
840
841 if ((usblp->readcount += count) == avail) {
842 if (usblp_submit_read(usblp) < 0) {
843 /* We don't want to leak USB return codes into errno. */
844 if (count == 0)
845 count = -EIO;
846 goto done;
847 }
848 }
849
850 done:
851 mutex_unlock(&usblp->mut);
852 return count;
853 }
854
855 /*
856 * Wait for the write path to come idle.
857 * This is called under the ->wmut, so the idle path stays idle.
858 *
859 * Our write path has a peculiar property: it does not buffer like a tty,
860 * but waits for the write to succeed. This allows our ->release to bug out
861 * without waiting for writes to drain. But it obviously does not work
862 * when O_NONBLOCK is set. So, applications setting O_NONBLOCK must use
863 * select(2) or poll(2) to wait for the buffer to drain before closing.
864 * Alternatively, set blocking mode with fcntl and issue a zero-size write.
865 */
866 static int usblp_wwait(struct usblp *usblp, int nonblock)
867 {
868 DECLARE_WAITQUEUE(waita, current);
869 int rc;
870 int err = 0;
871
872 add_wait_queue(&usblp->wwait, &waita);
873 for (;;) {
874 if (mutex_lock_interruptible(&usblp->mut)) {
875 rc = -EINTR;
876 break;
877 }
878 set_current_state(TASK_INTERRUPTIBLE);
879 rc = usblp_wtest(usblp, nonblock);
880 mutex_unlock(&usblp->mut);
881 if (rc <= 0)
882 break;
883
884 if (schedule_timeout(msecs_to_jiffies(1500)) == 0) {
885 if (usblp->flags & LP_ABORT) {
886 err = usblp_check_status(usblp, err);
887 if (err == 1) { /* Paper out */
888 rc = -ENOSPC;
889 break;
890 }
891 } else {
892 /* Prod the printer, Gentoo#251237. */
893 mutex_lock(&usblp->mut);
894 usblp_read_status(usblp, usblp->statusbuf);
895 mutex_unlock(&usblp->mut);
896 }
897 }
898 }
899 set_current_state(TASK_RUNNING);
900 remove_wait_queue(&usblp->wwait, &waita);
901 return rc;
902 }
903
904 static int usblp_wtest(struct usblp *usblp, int nonblock)
905 {
906 unsigned long flags;
907
908 if (!usblp->present)
909 return -ENODEV;
910 if (signal_pending(current))
911 return -EINTR;
912 spin_lock_irqsave(&usblp->lock, flags);
913 if (usblp->wcomplete) {
914 spin_unlock_irqrestore(&usblp->lock, flags);
915 return 0;
916 }
917 spin_unlock_irqrestore(&usblp->lock, flags);
918 if (nonblock)
919 return -EAGAIN;
920 return 1;
921 }
922
923 /*
924 * Wait for read bytes to become available. This probably should have been
925 * called usblp_r_lock_and_wait(), because we lock first. But it's a traditional
926 * name for functions which lock and return.
927 *
928 * We do not use wait_event_interruptible because it makes locking iffy.
929 */
930 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock)
931 {
932 DECLARE_WAITQUEUE(waita, current);
933 int rc;
934
935 add_wait_queue(&usblp->rwait, &waita);
936 for (;;) {
937 if (mutex_lock_interruptible(&usblp->mut)) {
938 rc = -EINTR;
939 break;
940 }
941 set_current_state(TASK_INTERRUPTIBLE);
942 if ((rc = usblp_rtest(usblp, nonblock)) < 0) {
943 mutex_unlock(&usblp->mut);
944 break;
945 }
946 if (rc == 0) /* Keep it locked */
947 break;
948 mutex_unlock(&usblp->mut);
949 schedule();
950 }
951 set_current_state(TASK_RUNNING);
952 remove_wait_queue(&usblp->rwait, &waita);
953 return rc;
954 }
955
956 static int usblp_rtest(struct usblp *usblp, int nonblock)
957 {
958 unsigned long flags;
959
960 if (!usblp->present)
961 return -ENODEV;
962 if (signal_pending(current))
963 return -EINTR;
964 spin_lock_irqsave(&usblp->lock, flags);
965 if (usblp->rcomplete) {
966 spin_unlock_irqrestore(&usblp->lock, flags);
967 return 0;
968 }
969 spin_unlock_irqrestore(&usblp->lock, flags);
970 if (nonblock)
971 return -EAGAIN;
972 return 1;
973 }
974
975 /*
976 * Please check ->bidir and other such things outside for now.
977 */
978 static int usblp_submit_read(struct usblp *usblp)
979 {
980 struct urb *urb;
981 unsigned long flags;
982 int rc;
983
984 rc = -ENOMEM;
985 urb = usb_alloc_urb(0, GFP_KERNEL);
986 if (urb == NULL)
987 goto raise_urb;
988
989 usb_fill_bulk_urb(urb, usblp->dev,
990 usb_rcvbulkpipe(usblp->dev,
991 usblp->protocol[usblp->current_protocol].epread->bEndpointAddress),
992 usblp->readbuf, USBLP_BUF_SIZE_IN,
993 usblp_bulk_read, usblp);
994 usb_anchor_urb(urb, &usblp->urbs);
995
996 spin_lock_irqsave(&usblp->lock, flags);
997 usblp->readcount = 0; /* XXX Why here? */
998 usblp->rcomplete = 0;
999 spin_unlock_irqrestore(&usblp->lock, flags);
1000 if ((rc = usb_submit_urb(urb, GFP_KERNEL)) < 0) {
1001 dev_dbg(&usblp->intf->dev, "error submitting urb (%d)\n", rc);
1002 spin_lock_irqsave(&usblp->lock, flags);
1003 usblp->rstatus = rc;
1004 usblp->rcomplete = 1;
1005 spin_unlock_irqrestore(&usblp->lock, flags);
1006 goto raise_submit;
1007 }
1008
1009 return 0;
1010
1011 raise_submit:
1012 usb_unanchor_urb(urb);
1013 usb_free_urb(urb);
1014 raise_urb:
1015 return rc;
1016 }
1017
1018 /*
1019 * Checks for printers that have quirks, such as requiring unidirectional
1020 * communication but reporting bidirectional; currently some HP printers
1021 * have this flaw (HP 810, 880, 895, etc.), or needing an init string
1022 * sent at each open (like some Epsons).
1023 * Returns 1 if found, 0 if not found.
1024 *
1025 * HP recommended that we use the bidirectional interface but
1026 * don't attempt any bulk IN transfers from the IN endpoint.
1027 * Here's some more detail on the problem:
1028 * The problem is not that it isn't bidirectional though. The problem
1029 * is that if you request a device ID, or status information, while
1030 * the buffers are full, the return data will end up in the print data
1031 * buffer. For example if you make sure you never request the device ID
1032 * while you are sending print data, and you don't try to query the
1033 * printer status every couple of milliseconds, you will probably be OK.
1034 */
1035 static unsigned int usblp_quirks(__u16 vendor, __u16 product)
1036 {
1037 int i;
1038
1039 for (i = 0; quirk_printers[i].vendorId; i++) {
1040 if (vendor == quirk_printers[i].vendorId &&
1041 product == quirk_printers[i].productId)
1042 return quirk_printers[i].quirks;
1043 }
1044 return 0;
1045 }
1046
1047 static const struct file_operations usblp_fops = {
1048 .owner = THIS_MODULE,
1049 .read = usblp_read,
1050 .write = usblp_write,
1051 .poll = usblp_poll,
1052 .unlocked_ioctl = usblp_ioctl,
1053 .compat_ioctl = usblp_ioctl,
1054 .open = usblp_open,
1055 .release = usblp_release,
1056 .llseek = noop_llseek,
1057 };
1058
1059 static char *usblp_devnode(struct device *dev, umode_t *mode)
1060 {
1061 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
1062 }
1063
1064 static struct usb_class_driver usblp_class = {
1065 .name = "lp%d",
1066 .devnode = usblp_devnode,
1067 .fops = &usblp_fops,
1068 .minor_base = USBLP_MINOR_BASE,
1069 };
1070
1071 static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf)
1072 {
1073 struct usb_interface *intf = to_usb_interface(dev);
1074 struct usblp *usblp = usb_get_intfdata(intf);
1075
1076 if (usblp->device_id_string[0] == 0 &&
1077 usblp->device_id_string[1] == 0)
1078 return 0;
1079
1080 return sprintf(buf, "%s", usblp->device_id_string+2);
1081 }
1082
1083 static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL);
1084
1085 static int usblp_probe(struct usb_interface *intf,
1086 const struct usb_device_id *id)
1087 {
1088 struct usb_device *dev = interface_to_usbdev(intf);
1089 struct usblp *usblp;
1090 int protocol;
1091 int retval;
1092
1093 /* Malloc and start initializing usblp structure so we can use it
1094 * directly. */
1095 usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL);
1096 if (!usblp) {
1097 retval = -ENOMEM;
1098 goto abort_ret;
1099 }
1100 usblp->dev = dev;
1101 mutex_init(&usblp->wmut);
1102 mutex_init(&usblp->mut);
1103 spin_lock_init(&usblp->lock);
1104 init_waitqueue_head(&usblp->rwait);
1105 init_waitqueue_head(&usblp->wwait);
1106 init_usb_anchor(&usblp->urbs);
1107 usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
1108 usblp->intf = intf;
1109
1110 /* Malloc device ID string buffer to the largest expected length,
1111 * since we can re-query it on an ioctl and a dynamic string
1112 * could change in length. */
1113 if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
1114 retval = -ENOMEM;
1115 goto abort;
1116 }
1117
1118 /*
1119 * Allocate read buffer. We somewhat wastefully
1120 * malloc both regardless of bidirectionality, because the
1121 * alternate setting can be changed later via an ioctl.
1122 */
1123 if (!(usblp->readbuf = kmalloc(USBLP_BUF_SIZE_IN, GFP_KERNEL))) {
1124 retval = -ENOMEM;
1125 goto abort;
1126 }
1127
1128 /* Allocate buffer for printer status */
1129 usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
1130 if (!usblp->statusbuf) {
1131 retval = -ENOMEM;
1132 goto abort;
1133 }
1134
1135 /* Lookup quirks for this printer. */
1136 usblp->quirks = usblp_quirks(
1137 le16_to_cpu(dev->descriptor.idVendor),
1138 le16_to_cpu(dev->descriptor.idProduct));
1139
1140 /* Analyze and pick initial alternate settings and endpoints. */
1141 protocol = usblp_select_alts(usblp);
1142 if (protocol < 0) {
1143 dev_dbg(&intf->dev,
1144 "incompatible printer-class device 0x%4.4X/0x%4.4X\n",
1145 le16_to_cpu(dev->descriptor.idVendor),
1146 le16_to_cpu(dev->descriptor.idProduct));
1147 retval = -ENODEV;
1148 goto abort;
1149 }
1150
1151 /* Setup the selected alternate setting and endpoints. */
1152 if (usblp_set_protocol(usblp, protocol) < 0) {
1153 retval = -ENODEV; /* ->probe isn't ->ioctl */
1154 goto abort;
1155 }
1156
1157 /* Retrieve and store the device ID string. */
1158 usblp_cache_device_id_string(usblp);
1159 retval = device_create_file(&intf->dev, &dev_attr_ieee1284_id);
1160 if (retval)
1161 goto abort_intfdata;
1162
1163 #ifdef DEBUG
1164 usblp_check_status(usblp, 0);
1165 #endif
1166
1167 usb_set_intfdata(intf, usblp);
1168
1169 usblp->present = 1;
1170
1171 retval = usb_register_dev(intf, &usblp_class);
1172 if (retval) {
1173 dev_err(&intf->dev,
1174 "usblp: Not able to get a minor (base %u, slice default): %d\n",
1175 USBLP_MINOR_BASE, retval);
1176 goto abort_intfdata;
1177 }
1178 usblp->minor = intf->minor;
1179 dev_info(&intf->dev,
1180 "usblp%d: USB %sdirectional printer dev %d if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X\n",
1181 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
1182 usblp->ifnum,
1183 usblp->protocol[usblp->current_protocol].alt_setting,
1184 usblp->current_protocol,
1185 le16_to_cpu(usblp->dev->descriptor.idVendor),
1186 le16_to_cpu(usblp->dev->descriptor.idProduct));
1187
1188 return 0;
1189
1190 abort_intfdata:
1191 usb_set_intfdata(intf, NULL);
1192 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1193 abort:
1194 kfree(usblp->readbuf);
1195 kfree(usblp->statusbuf);
1196 kfree(usblp->device_id_string);
1197 kfree(usblp);
1198 abort_ret:
1199 return retval;
1200 }
1201
1202 /*
1203 * We are a "new" style driver with usb_device_id table,
1204 * but our requirements are too intricate for simple match to handle.
1205 *
1206 * The "proto_bias" option may be used to specify the preferred protocol
1207 * for all USB printers (1=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2,
1208 * 3=USB_CLASS_PRINTER/1/3). If the device supports the preferred protocol,
1209 * then we bind to it.
1210 *
1211 * The best interface for us is USB_CLASS_PRINTER/1/2, because it
1212 * is compatible with a stream of characters. If we find it, we bind to it.
1213 *
1214 * Note that the people from hpoj.sourceforge.net need to be able to
1215 * bind to USB_CLASS_PRINTER/1/3 (MLC/1284.4), so we provide them ioctls
1216 * for this purpose.
1217 *
1218 * Failing USB_CLASS_PRINTER/1/2, we look for USB_CLASS_PRINTER/1/3,
1219 * even though it's probably not stream-compatible, because this matches
1220 * the behaviour of the old code.
1221 *
1222 * If nothing else, we bind to USB_CLASS_PRINTER/1/1
1223 * - the unidirectional interface.
1224 */
1225 static int usblp_select_alts(struct usblp *usblp)
1226 {
1227 struct usb_interface *if_alt;
1228 struct usb_host_interface *ifd;
1229 struct usb_endpoint_descriptor *epwrite, *epread;
1230 int p, i;
1231 int res;
1232
1233 if_alt = usblp->intf;
1234
1235 for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1236 usblp->protocol[p].alt_setting = -1;
1237
1238 /* Find out what we have. */
1239 for (i = 0; i < if_alt->num_altsetting; i++) {
1240 ifd = &if_alt->altsetting[i];
1241
1242 if (ifd->desc.bInterfaceClass != USB_CLASS_PRINTER ||
1243 ifd->desc.bInterfaceSubClass != 1)
1244 if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS))
1245 continue;
1246
1247 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1248 ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1249 continue;
1250
1251 /* Look for the expected bulk endpoints. */
1252 if (ifd->desc.bInterfaceProtocol > 1) {
1253 res = usb_find_common_endpoints(ifd,
1254 &epread, &epwrite, NULL, NULL);
1255 } else {
1256 epread = NULL;
1257 res = usb_find_bulk_out_endpoint(ifd, &epwrite);
1258 }
1259
1260 /* Ignore buggy hardware without the right endpoints. */
1261 if (res)
1262 continue;
1263
1264 /* Turn off reads for buggy bidirectional printers. */
1265 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(USB_CLASS_PRINTER, 1, 1) },
1406 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 2) },
1407 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 3) },
1408 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 1) },
1409 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 2) },
1410 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 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");
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