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Merge tag 'trace-v5.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
[linux/fpc-iii.git] / drivers / usb / class / usblp.c
blob134dc2005ce97de81ee1787510d4772395da8ef4
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 static 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 * See the description for usblp_select_alts() below for the usage
299 * explanation. Look into your /sys/kernel/debug/usb/devices and dmesg in
300 * case of any trouble.
301 */
302 static int proto_bias = -1;
303
304 /*
305 * URB callback.
306 */
307
308 static 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
332 static 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 * Get and print printer errors.
359 */
360
361 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
362
363 static 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
394 static 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 * File op functions.
405 */
406
407 static 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 * We do not implement LP_ABORTOPEN/LPABORTOPEN for two reasons:
433 * - We do not want persistent state which close(2) does not clear
434 * - It is not used anyway, according to CUPS people
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; /* we begin writeable */
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 }
453 out:
454 mutex_unlock(&usblp_mutex);
455 return retval;
456 }
457
458 static 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
469 static void usblp_unlink_urbs(struct usblp *usblp)
470 {
471 usb_kill_anchored_urbs(&usblp->urbs);
472 }
473
474 static 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) /* finish cleanup from disconnect */
488 usblp_cleanup(usblp); /* any URBs must be dead */
489
490 mutex_unlock(&usblp_mutex);
491 return 0;
492 }
493
494 /* No kernel lock - fine */
495 static __poll_t usblp_poll(struct file *file, struct poll_table_struct *wait)
496 {
497 __poll_t ret;
498 unsigned long flags;
499
500 struct usblp *usblp = file->private_data;
501 /* Should we check file->f_mode & FMODE_WRITE before poll_wait()? */
502 poll_wait(file, &usblp->rwait, wait);
503 poll_wait(file, &usblp->wwait, wait);
504 spin_lock_irqsave(&usblp->lock, flags);
505 ret = ((usblp->bidir && usblp->rcomplete) ? EPOLLIN | EPOLLRDNORM : 0) |
506 ((usblp->no_paper || usblp->wcomplete) ? EPOLLOUT | EPOLLWRNORM : 0);
507 spin_unlock_irqrestore(&usblp->lock, flags);
508 return ret;
509 }
510
511 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
512 {
513 struct usblp *usblp = file->private_data;
514 int length, err, i;
515 unsigned char newChannel;
516 int status;
517 int twoints[2];
518 int retval = 0;
519
520 mutex_lock(&usblp->mut);
521 if (!usblp->present) {
522 retval = -ENODEV;
523 goto done;
524 }
525
526 dev_dbg(&usblp->intf->dev,
527 "usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)\n", cmd,
528 _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd));
529
530 if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */
531
532 switch (_IOC_NR(cmd)) {
533
534 case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
535 if (_IOC_DIR(cmd) != _IOC_READ) {
536 retval = -EINVAL;
537 goto done;
538 }
539
540 length = usblp_cache_device_id_string(usblp);
541 if (length < 0) {
542 retval = length;
543 goto done;
544 }
545 if (length > _IOC_SIZE(cmd))
546 length = _IOC_SIZE(cmd); /* truncate */
547
548 if (copy_to_user((void __user *) arg,
549 usblp->device_id_string,
550 (unsigned long) length)) {
551 retval = -EFAULT;
552 goto done;
553 }
554
555 break;
556
557 case IOCNR_GET_PROTOCOLS:
558 if (_IOC_DIR(cmd) != _IOC_READ ||
559 _IOC_SIZE(cmd) < sizeof(twoints)) {
560 retval = -EINVAL;
561 goto done;
562 }
563
564 twoints[0] = usblp->current_protocol;
565 twoints[1] = 0;
566 for (i = USBLP_FIRST_PROTOCOL;
567 i <= USBLP_LAST_PROTOCOL; i++) {
568 if (usblp->protocol[i].alt_setting >= 0)
569 twoints[1] |= (1<<i);
570 }
571
572 if (copy_to_user((void __user *)arg,
573 (unsigned char *)twoints,
574 sizeof(twoints))) {
575 retval = -EFAULT;
576 goto done;
577 }
578
579 break;
580
581 case IOCNR_SET_PROTOCOL:
582 if (_IOC_DIR(cmd) != _IOC_WRITE) {
583 retval = -EINVAL;
584 goto done;
585 }
586
587 #ifdef DEBUG
588 if (arg == -10) {
589 usblp_dump(usblp);
590 break;
591 }
592 #endif
593
594 usblp_unlink_urbs(usblp);
595 retval = usblp_set_protocol(usblp, arg);
596 if (retval < 0) {
597 usblp_set_protocol(usblp,
598 usblp->current_protocol);
599 }
600 break;
601
602 case IOCNR_HP_SET_CHANNEL:
603 if (_IOC_DIR(cmd) != _IOC_WRITE ||
604 le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
605 usblp->quirks & USBLP_QUIRK_BIDIR) {
606 retval = -EINVAL;
607 goto done;
608 }
609
610 err = usblp_hp_channel_change_request(usblp,
611 arg, &newChannel);
612 if (err < 0) {
613 dev_err(&usblp->dev->dev,
614 "usblp%d: error = %d setting "
615 "HP channel\n",
616 usblp->minor, err);
617 retval = -EIO;
618 goto done;
619 }
620
621 dev_dbg(&usblp->intf->dev,
622 "usblp%d requested/got HP channel %ld/%d\n",
623 usblp->minor, arg, newChannel);
624 break;
625
626 case IOCNR_GET_BUS_ADDRESS:
627 if (_IOC_DIR(cmd) != _IOC_READ ||
628 _IOC_SIZE(cmd) < sizeof(twoints)) {
629 retval = -EINVAL;
630 goto done;
631 }
632
633 twoints[0] = usblp->dev->bus->busnum;
634 twoints[1] = usblp->dev->devnum;
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 bus=%d, device=%d\n",
644 usblp->minor, twoints[0], twoints[1]);
645 break;
646
647 case IOCNR_GET_VID_PID:
648 if (_IOC_DIR(cmd) != _IOC_READ ||
649 _IOC_SIZE(cmd) < sizeof(twoints)) {
650 retval = -EINVAL;
651 goto done;
652 }
653
654 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
655 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
656 if (copy_to_user((void __user *)arg,
657 (unsigned char *)twoints,
658 sizeof(twoints))) {
659 retval = -EFAULT;
660 goto done;
661 }
662
663 dev_dbg(&usblp->intf->dev,
664 "usblp%d is VID=0x%4.4X, PID=0x%4.4X\n",
665 usblp->minor, twoints[0], twoints[1]);
666 break;
667
668 case IOCNR_SOFT_RESET:
669 if (_IOC_DIR(cmd) != _IOC_NONE) {
670 retval = -EINVAL;
671 goto done;
672 }
673 retval = usblp_reset(usblp);
674 break;
675 default:
676 retval = -ENOTTY;
677 }
678 else /* old-style ioctl value */
679 switch (cmd) {
680
681 case LPGETSTATUS:
682 retval = usblp_read_status(usblp, usblp->statusbuf);
683 if (retval) {
684 printk_ratelimited(KERN_ERR "usblp%d:"
685 "failed reading printer status (%d)\n",
686 usblp->minor, retval);
687 retval = -EIO;
688 goto done;
689 }
690 status = *usblp->statusbuf;
691 if (copy_to_user((void __user *)arg, &status, sizeof(int)))
692 retval = -EFAULT;
693 break;
694
695 case LPABORT:
696 if (arg)
697 usblp->flags |= LP_ABORT;
698 else
699 usblp->flags &= ~LP_ABORT;
700 break;
701
702 default:
703 retval = -ENOTTY;
704 }
705
706 done:
707 mutex_unlock(&usblp->mut);
708 return retval;
709 }
710
711 static struct urb *usblp_new_writeurb(struct usblp *usblp, int transfer_length)
712 {
713 struct urb *urb;
714 char *writebuf;
715
716 writebuf = kmalloc(transfer_length, GFP_KERNEL);
717 if (writebuf == NULL)
718 return NULL;
719 urb = usb_alloc_urb(0, GFP_KERNEL);
720 if (urb == NULL) {
721 kfree(writebuf);
722 return NULL;
723 }
724
725 usb_fill_bulk_urb(urb, usblp->dev,
726 usb_sndbulkpipe(usblp->dev,
727 usblp->protocol[usblp->current_protocol].epwrite->bEndpointAddress),
728 writebuf, transfer_length, usblp_bulk_write, usblp);
729 urb->transfer_flags |= URB_FREE_BUFFER;
730
731 return urb;
732 }
733
734 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
735 {
736 struct usblp *usblp = file->private_data;
737 struct urb *writeurb;
738 int rv;
739 int transfer_length;
740 ssize_t writecount = 0;
741
742 if (mutex_lock_interruptible(&usblp->wmut)) {
743 rv = -EINTR;
744 goto raise_biglock;
745 }
746 if ((rv = usblp_wwait(usblp, !!(file->f_flags & O_NONBLOCK))) < 0)
747 goto raise_wait;
748
749 while (writecount < count) {
750 /*
751 * Step 1: Submit next block.
752 */
753 if ((transfer_length = count - writecount) > USBLP_BUF_SIZE)
754 transfer_length = USBLP_BUF_SIZE;
755
756 rv = -ENOMEM;
757 writeurb = usblp_new_writeurb(usblp, transfer_length);
758 if (writeurb == NULL)
759 goto raise_urb;
760 usb_anchor_urb(writeurb, &usblp->urbs);
761
762 if (copy_from_user(writeurb->transfer_buffer,
763 buffer + writecount, transfer_length)) {
764 rv = -EFAULT;
765 goto raise_badaddr;
766 }
767
768 spin_lock_irq(&usblp->lock);
769 usblp->wcomplete = 0;
770 spin_unlock_irq(&usblp->lock);
771 if ((rv = usb_submit_urb(writeurb, GFP_KERNEL)) < 0) {
772 usblp->wstatus = 0;
773 spin_lock_irq(&usblp->lock);
774 usblp->no_paper = 0;
775 usblp->wcomplete = 1;
776 wake_up(&usblp->wwait);
777 spin_unlock_irq(&usblp->lock);
778 if (rv != -ENOMEM)
779 rv = -EIO;
780 goto raise_submit;
781 }
782
783 /*
784 * Step 2: Wait for transfer to end, collect results.
785 */
786 rv = usblp_wwait(usblp, !!(file->f_flags&O_NONBLOCK));
787 if (rv < 0) {
788 if (rv == -EAGAIN) {
789 /* Presume that it's going to complete well. */
790 writecount += transfer_length;
791 }
792 if (rv == -ENOSPC) {
793 spin_lock_irq(&usblp->lock);
794 usblp->no_paper = 1; /* Mark for poll(2) */
795 spin_unlock_irq(&usblp->lock);
796 writecount += transfer_length;
797 }
798 /* Leave URB dangling, to be cleaned on close. */
799 goto collect_error;
800 }
801
802 if (usblp->wstatus < 0) {
803 rv = -EIO;
804 goto collect_error;
805 }
806 /*
807 * This is critical: it must be our URB, not other writer's.
808 * The wmut exists mainly to cover us here.
809 */
810 writecount += usblp->wstatus;
811 }
812
813 mutex_unlock(&usblp->wmut);
814 return writecount;
815
816 raise_submit:
817 raise_badaddr:
818 usb_unanchor_urb(writeurb);
819 usb_free_urb(writeurb);
820 raise_urb:
821 raise_wait:
822 collect_error: /* Out of raise sequence */
823 mutex_unlock(&usblp->wmut);
824 raise_biglock:
825 return writecount ? writecount : rv;
826 }
827
828 /*
829 * Notice that we fail to restart in a few cases: on EFAULT, on restart
830 * error, etc. This is the historical behaviour. In all such cases we return
831 * EIO, and applications loop in order to get the new read going.
832 */
833 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t len, loff_t *ppos)
834 {
835 struct usblp *usblp = file->private_data;
836 ssize_t count;
837 ssize_t avail;
838 int rv;
839
840 if (!usblp->bidir)
841 return -EINVAL;
842
843 rv = usblp_rwait_and_lock(usblp, !!(file->f_flags & O_NONBLOCK));
844 if (rv < 0)
845 return rv;
846
847 if (!usblp->present) {
848 count = -ENODEV;
849 goto done;
850 }
851
852 if ((avail = usblp->rstatus) < 0) {
853 printk(KERN_ERR "usblp%d: error %d reading from printer\n",
854 usblp->minor, (int)avail);
855 usblp_submit_read(usblp);
856 count = -EIO;
857 goto done;
858 }
859
860 count = len < avail - usblp->readcount ? len : avail - usblp->readcount;
861 if (count != 0 &&
862 copy_to_user(buffer, usblp->readbuf + usblp->readcount, count)) {
863 count = -EFAULT;
864 goto done;
865 }
866
867 if ((usblp->readcount += count) == avail) {
868 if (usblp_submit_read(usblp) < 0) {
869 /* We don't want to leak USB return codes into errno. */
870 if (count == 0)
871 count = -EIO;
872 goto done;
873 }
874 }
875
876 done:
877 mutex_unlock(&usblp->mut);
878 return count;
879 }
880
881 /*
882 * Wait for the write path to come idle.
883 * This is called under the ->wmut, so the idle path stays idle.
884 *
885 * Our write path has a peculiar property: it does not buffer like a tty,
886 * but waits for the write to succeed. This allows our ->release to bug out
887 * without waiting for writes to drain. But it obviously does not work
888 * when O_NONBLOCK is set. So, applications setting O_NONBLOCK must use
889 * select(2) or poll(2) to wait for the buffer to drain before closing.
890 * Alternatively, set blocking mode with fcntl and issue a zero-size write.
891 */
892 static int usblp_wwait(struct usblp *usblp, int nonblock)
893 {
894 DECLARE_WAITQUEUE(waita, current);
895 int rc;
896 int err = 0;
897
898 add_wait_queue(&usblp->wwait, &waita);
899 for (;;) {
900 if (mutex_lock_interruptible(&usblp->mut)) {
901 rc = -EINTR;
902 break;
903 }
904 set_current_state(TASK_INTERRUPTIBLE);
905 rc = usblp_wtest(usblp, nonblock);
906 mutex_unlock(&usblp->mut);
907 if (rc <= 0)
908 break;
909
910 if (schedule_timeout(msecs_to_jiffies(1500)) == 0) {
911 if (usblp->flags & LP_ABORT) {
912 err = usblp_check_status(usblp, err);
913 if (err == 1) { /* Paper out */
914 rc = -ENOSPC;
915 break;
916 }
917 } else {
918 /* Prod the printer, Gentoo#251237. */
919 mutex_lock(&usblp->mut);
920 usblp_read_status(usblp, usblp->statusbuf);
921 mutex_unlock(&usblp->mut);
922 }
923 }
924 }
925 set_current_state(TASK_RUNNING);
926 remove_wait_queue(&usblp->wwait, &waita);
927 return rc;
928 }
929
930 static int usblp_wtest(struct usblp *usblp, int nonblock)
931 {
932 unsigned long flags;
933
934 if (!usblp->present)
935 return -ENODEV;
936 if (signal_pending(current))
937 return -EINTR;
938 spin_lock_irqsave(&usblp->lock, flags);
939 if (usblp->wcomplete) {
940 spin_unlock_irqrestore(&usblp->lock, flags);
941 return 0;
942 }
943 spin_unlock_irqrestore(&usblp->lock, flags);
944 if (nonblock)
945 return -EAGAIN;
946 return 1;
947 }
948
949 /*
950 * Wait for read bytes to become available. This probably should have been
951 * called usblp_r_lock_and_wait(), because we lock first. But it's a traditional
952 * name for functions which lock and return.
953 *
954 * We do not use wait_event_interruptible because it makes locking iffy.
955 */
956 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock)
957 {
958 DECLARE_WAITQUEUE(waita, current);
959 int rc;
960
961 add_wait_queue(&usblp->rwait, &waita);
962 for (;;) {
963 if (mutex_lock_interruptible(&usblp->mut)) {
964 rc = -EINTR;
965 break;
966 }
967 set_current_state(TASK_INTERRUPTIBLE);
968 if ((rc = usblp_rtest(usblp, nonblock)) < 0) {
969 mutex_unlock(&usblp->mut);
970 break;
971 }
972 if (rc == 0) /* Keep it locked */
973 break;
974 mutex_unlock(&usblp->mut);
975 schedule();
976 }
977 set_current_state(TASK_RUNNING);
978 remove_wait_queue(&usblp->rwait, &waita);
979 return rc;
980 }
981
982 static int usblp_rtest(struct usblp *usblp, int nonblock)
983 {
984 unsigned long flags;
985
986 if (!usblp->present)
987 return -ENODEV;
988 if (signal_pending(current))
989 return -EINTR;
990 spin_lock_irqsave(&usblp->lock, flags);
991 if (usblp->rcomplete) {
992 spin_unlock_irqrestore(&usblp->lock, flags);
993 return 0;
994 }
995 spin_unlock_irqrestore(&usblp->lock, flags);
996 if (nonblock)
997 return -EAGAIN;
998 return 1;
999 }
1000
1001 /*
1002 * Please check ->bidir and other such things outside for now.
1003 */
1004 static int usblp_submit_read(struct usblp *usblp)
1005 {
1006 struct urb *urb;
1007 unsigned long flags;
1008 int rc;
1009
1010 rc = -ENOMEM;
1011 urb = usb_alloc_urb(0, GFP_KERNEL);
1012 if (urb == NULL)
1013 goto raise_urb;
1014
1015 usb_fill_bulk_urb(urb, usblp->dev,
1016 usb_rcvbulkpipe(usblp->dev,
1017 usblp->protocol[usblp->current_protocol].epread->bEndpointAddress),
1018 usblp->readbuf, USBLP_BUF_SIZE_IN,
1019 usblp_bulk_read, usblp);
1020 usb_anchor_urb(urb, &usblp->urbs);
1021
1022 spin_lock_irqsave(&usblp->lock, flags);
1023 usblp->readcount = 0; /* XXX Why here? */
1024 usblp->rcomplete = 0;
1025 spin_unlock_irqrestore(&usblp->lock, flags);
1026 if ((rc = usb_submit_urb(urb, GFP_KERNEL)) < 0) {
1027 dev_dbg(&usblp->intf->dev, "error submitting urb (%d)\n", rc);
1028 spin_lock_irqsave(&usblp->lock, flags);
1029 usblp->rstatus = rc;
1030 usblp->rcomplete = 1;
1031 spin_unlock_irqrestore(&usblp->lock, flags);
1032 goto raise_submit;
1033 }
1034
1035 return 0;
1036
1037 raise_submit:
1038 usb_unanchor_urb(urb);
1039 usb_free_urb(urb);
1040 raise_urb:
1041 return rc;
1042 }
1043
1044 /*
1045 * Checks for printers that have quirks, such as requiring unidirectional
1046 * communication but reporting bidirectional; currently some HP printers
1047 * have this flaw (HP 810, 880, 895, etc.), or needing an init string
1048 * sent at each open (like some Epsons).
1049 * Returns 1 if found, 0 if not found.
1050 *
1051 * HP recommended that we use the bidirectional interface but
1052 * don't attempt any bulk IN transfers from the IN endpoint.
1053 * Here's some more detail on the problem:
1054 * The problem is not that it isn't bidirectional though. The problem
1055 * is that if you request a device ID, or status information, while
1056 * the buffers are full, the return data will end up in the print data
1057 * buffer. For example if you make sure you never request the device ID
1058 * while you are sending print data, and you don't try to query the
1059 * printer status every couple of milliseconds, you will probably be OK.
1060 */
1061 static unsigned int usblp_quirks(__u16 vendor, __u16 product)
1062 {
1063 int i;
1064
1065 for (i = 0; quirk_printers[i].vendorId; i++) {
1066 if (vendor == quirk_printers[i].vendorId &&
1067 product == quirk_printers[i].productId)
1068 return quirk_printers[i].quirks;
1069 }
1070 return 0;
1071 }
1072
1073 static const struct file_operations usblp_fops = {
1074 .owner = THIS_MODULE,
1075 .read = usblp_read,
1076 .write = usblp_write,
1077 .poll = usblp_poll,
1078 .unlocked_ioctl = usblp_ioctl,
1079 .compat_ioctl = usblp_ioctl,
1080 .open = usblp_open,
1081 .release = usblp_release,
1082 .llseek = noop_llseek,
1083 };
1084
1085 static char *usblp_devnode(struct device *dev, umode_t *mode)
1086 {
1087 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
1088 }
1089
1090 static struct usb_class_driver usblp_class = {
1091 .name = "lp%d",
1092 .devnode = usblp_devnode,
1093 .fops = &usblp_fops,
1094 .minor_base = USBLP_MINOR_BASE,
1095 };
1096
1097 static ssize_t ieee1284_id_show(struct device *dev, struct device_attribute *attr, char *buf)
1098 {
1099 struct usb_interface *intf = to_usb_interface(dev);
1100 struct usblp *usblp = usb_get_intfdata(intf);
1101
1102 if (usblp->device_id_string[0] == 0 &&
1103 usblp->device_id_string[1] == 0)
1104 return 0;
1105
1106 return sprintf(buf, "%s", usblp->device_id_string+2);
1107 }
1108
1109 static DEVICE_ATTR_RO(ieee1284_id);
1110
1111 static struct attribute *usblp_attrs[] = {
1112 &dev_attr_ieee1284_id.attr,
1113 NULL,
1114 };
1115 ATTRIBUTE_GROUPS(usblp);
1116
1117 static int usblp_probe(struct usb_interface *intf,
1118 const struct usb_device_id *id)
1119 {
1120 struct usb_device *dev = interface_to_usbdev(intf);
1121 struct usblp *usblp;
1122 int protocol;
1123 int retval;
1124
1125 /* Malloc and start initializing usblp structure so we can use it
1126 * directly. */
1127 usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL);
1128 if (!usblp) {
1129 retval = -ENOMEM;
1130 goto abort_ret;
1131 }
1132 usblp->dev = dev;
1133 mutex_init(&usblp->wmut);
1134 mutex_init(&usblp->mut);
1135 spin_lock_init(&usblp->lock);
1136 init_waitqueue_head(&usblp->rwait);
1137 init_waitqueue_head(&usblp->wwait);
1138 init_usb_anchor(&usblp->urbs);
1139 usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
1140 usblp->intf = usb_get_intf(intf);
1141
1142 /* Malloc device ID string buffer to the largest expected length,
1143 * since we can re-query it on an ioctl and a dynamic string
1144 * could change in length. */
1145 if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
1146 retval = -ENOMEM;
1147 goto abort;
1148 }
1149
1150 /*
1151 * Allocate read buffer. We somewhat wastefully
1152 * malloc both regardless of bidirectionality, because the
1153 * alternate setting can be changed later via an ioctl.
1154 */
1155 if (!(usblp->readbuf = kmalloc(USBLP_BUF_SIZE_IN, GFP_KERNEL))) {
1156 retval = -ENOMEM;
1157 goto abort;
1158 }
1159
1160 /* Allocate buffer for printer status */
1161 usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
1162 if (!usblp->statusbuf) {
1163 retval = -ENOMEM;
1164 goto abort;
1165 }
1166
1167 /* Lookup quirks for this printer. */
1168 usblp->quirks = usblp_quirks(
1169 le16_to_cpu(dev->descriptor.idVendor),
1170 le16_to_cpu(dev->descriptor.idProduct));
1171
1172 /* Analyze and pick initial alternate settings and endpoints. */
1173 protocol = usblp_select_alts(usblp);
1174 if (protocol < 0) {
1175 dev_dbg(&intf->dev,
1176 "incompatible printer-class device 0x%4.4X/0x%4.4X\n",
1177 le16_to_cpu(dev->descriptor.idVendor),
1178 le16_to_cpu(dev->descriptor.idProduct));
1179 retval = -ENODEV;
1180 goto abort;
1181 }
1182
1183 /* Setup the selected alternate setting and endpoints. */
1184 if (usblp_set_protocol(usblp, protocol) < 0) {
1185 retval = -ENODEV; /* ->probe isn't ->ioctl */
1186 goto abort;
1187 }
1188
1189 /* Retrieve and store the device ID string. */
1190 usblp_cache_device_id_string(usblp);
1191
1192 #ifdef DEBUG
1193 usblp_check_status(usblp, 0);
1194 #endif
1195
1196 usb_set_intfdata(intf, usblp);
1197
1198 usblp->present = 1;
1199
1200 retval = usb_register_dev(intf, &usblp_class);
1201 if (retval) {
1202 dev_err(&intf->dev,
1203 "usblp: Not able to get a minor (base %u, slice default): %d\n",
1204 USBLP_MINOR_BASE, retval);
1205 goto abort_intfdata;
1206 }
1207 usblp->minor = intf->minor;
1208 dev_info(&intf->dev,
1209 "usblp%d: USB %sdirectional printer dev %d if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X\n",
1210 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
1211 usblp->ifnum,
1212 usblp->protocol[usblp->current_protocol].alt_setting,
1213 usblp->current_protocol,
1214 le16_to_cpu(usblp->dev->descriptor.idVendor),
1215 le16_to_cpu(usblp->dev->descriptor.idProduct));
1216
1217 return 0;
1218
1219 abort_intfdata:
1220 usb_set_intfdata(intf, NULL);
1221 abort:
1222 kfree(usblp->readbuf);
1223 kfree(usblp->statusbuf);
1224 kfree(usblp->device_id_string);
1225 usb_put_intf(usblp->intf);
1226 kfree(usblp);
1227 abort_ret:
1228 return retval;
1229 }
1230
1231 /*
1232 * We are a "new" style driver with usb_device_id table,
1233 * but our requirements are too intricate for simple match to handle.
1234 *
1235 * The "proto_bias" option may be used to specify the preferred protocol
1236 * for all USB printers (1=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2,
1237 * 3=USB_CLASS_PRINTER/1/3). If the device supports the preferred protocol,
1238 * then we bind to it.
1239 *
1240 * The best interface for us is USB_CLASS_PRINTER/1/2, because it
1241 * is compatible with a stream of characters. If we find it, we bind to it.
1242 *
1243 * Note that the people from hpoj.sourceforge.net need to be able to
1244 * bind to USB_CLASS_PRINTER/1/3 (MLC/1284.4), so we provide them ioctls
1245 * for this purpose.
1246 *
1247 * Failing USB_CLASS_PRINTER/1/2, we look for USB_CLASS_PRINTER/1/3,
1248 * even though it's probably not stream-compatible, because this matches
1249 * the behaviour of the old code.
1250 *
1251 * If nothing else, we bind to USB_CLASS_PRINTER/1/1
1252 * - the unidirectional interface.
1253 */
1254 static int usblp_select_alts(struct usblp *usblp)
1255 {
1256 struct usb_interface *if_alt;
1257 struct usb_host_interface *ifd;
1258 struct usb_endpoint_descriptor *epwrite, *epread;
1259 int p, i;
1260 int res;
1261
1262 if_alt = usblp->intf;
1263
1264 for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1265 usblp->protocol[p].alt_setting = -1;
1266
1267 /* Find out what we have. */
1268 for (i = 0; i < if_alt->num_altsetting; i++) {
1269 ifd = &if_alt->altsetting[i];
1270
1271 if (ifd->desc.bInterfaceClass != USB_CLASS_PRINTER ||
1272 ifd->desc.bInterfaceSubClass != 1)
1273 if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS))
1274 continue;
1275
1276 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1277 ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1278 continue;
1279
1280 /* Look for the expected bulk endpoints. */
1281 if (ifd->desc.bInterfaceProtocol > 1) {
1282 res = usb_find_common_endpoints(ifd,
1283 &epread, &epwrite, NULL, NULL);
1284 } else {
1285 epread = NULL;
1286 res = usb_find_bulk_out_endpoint(ifd, &epwrite);
1287 }
1288
1289 /* Ignore buggy hardware without the right endpoints. */
1290 if (res)
1291 continue;
1292
1293 /* Turn off reads for buggy bidirectional printers. */
1294 if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1295 printk(KERN_INFO "usblp%d: Disabling reads from "
1296 "problematic bidirectional printer\n",
1297 usblp->minor);
1298 epread = NULL;
1299 }
1300
1301 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1302 ifd->desc.bAlternateSetting;
1303 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1304 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1305 }
1306
1307 /* If our requested protocol is supported, then use it. */
1308 if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1309 proto_bias <= USBLP_LAST_PROTOCOL &&
1310 usblp->protocol[proto_bias].alt_setting != -1)
1311 return proto_bias;
1312
1313 /* Ordering is important here. */
1314 if (usblp->protocol[2].alt_setting != -1)
1315 return 2;
1316 if (usblp->protocol[1].alt_setting != -1)
1317 return 1;
1318 if (usblp->protocol[3].alt_setting != -1)
1319 return 3;
1320
1321 /* If nothing is available, then don't bind to this device. */
1322 return -1;
1323 }
1324
1325 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1326 {
1327 int r, alts;
1328
1329 if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1330 return -EINVAL;
1331
1332 alts = usblp->protocol[protocol].alt_setting;
1333 if (alts < 0)
1334 return -EINVAL;
1335 r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1336 if (r < 0) {
1337 printk(KERN_ERR "usblp: can't set desired altsetting %d on interface %d\n",
1338 alts, usblp->ifnum);
1339 return r;
1340 }
1341
1342 usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1343 usblp->current_protocol = protocol;
1344 dev_dbg(&usblp->intf->dev, "usblp%d set protocol %d\n",
1345 usblp->minor, protocol);
1346 return 0;
1347 }
1348
1349 /* Retrieves and caches device ID string.
1350 * Returns length, including length bytes but not null terminator.
1351 * On error, returns a negative errno value. */
1352 static int usblp_cache_device_id_string(struct usblp *usblp)
1353 {
1354 int err, length;
1355
1356 err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1357 if (err < 0) {
1358 dev_dbg(&usblp->intf->dev,
1359 "usblp%d: error = %d reading IEEE-1284 Device ID string\n",
1360 usblp->minor, err);
1361 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1362 return -EIO;
1363 }
1364
1365 /* First two bytes are length in big-endian.
1366 * They count themselves, and we copy them into
1367 * the user's buffer. */
1368 length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1369 if (length < 2)
1370 length = 2;
1371 else if (length >= USBLP_DEVICE_ID_SIZE)
1372 length = USBLP_DEVICE_ID_SIZE - 1;
1373 usblp->device_id_string[length] = '\0';
1374
1375 dev_dbg(&usblp->intf->dev, "usblp%d Device ID string [len=%d]=\"%s\"\n",
1376 usblp->minor, length, &usblp->device_id_string[2]);
1377
1378 return length;
1379 }
1380
1381 static void usblp_disconnect(struct usb_interface *intf)
1382 {
1383 struct usblp *usblp = usb_get_intfdata(intf);
1384
1385 usb_deregister_dev(intf, &usblp_class);
1386
1387 if (!usblp || !usblp->dev) {
1388 dev_err(&intf->dev, "bogus disconnect\n");
1389 BUG();
1390 }
1391
1392 mutex_lock(&usblp_mutex);
1393 mutex_lock(&usblp->mut);
1394 usblp->present = 0;
1395 wake_up(&usblp->wwait);
1396 wake_up(&usblp->rwait);
1397 usb_set_intfdata(intf, NULL);
1398
1399 usblp_unlink_urbs(usblp);
1400 mutex_unlock(&usblp->mut);
1401 usb_poison_anchored_urbs(&usblp->urbs);
1402
1403 if (!usblp->used)
1404 usblp_cleanup(usblp);
1405
1406 mutex_unlock(&usblp_mutex);
1407 }
1408
1409 static int usblp_suspend(struct usb_interface *intf, pm_message_t message)
1410 {
1411 struct usblp *usblp = usb_get_intfdata(intf);
1412
1413 usblp_unlink_urbs(usblp);
1414 #if 0 /* XXX Do we want this? What if someone is reading, should we fail? */
1415 /* not strictly necessary, but just in case */
1416 wake_up(&usblp->wwait);
1417 wake_up(&usblp->rwait);
1418 #endif
1419
1420 return 0;
1421 }
1422
1423 static int usblp_resume(struct usb_interface *intf)
1424 {
1425 struct usblp *usblp = usb_get_intfdata(intf);
1426 int r;
1427
1428 r = handle_bidir(usblp);
1429
1430 return r;
1431 }
1432
1433 static const struct usb_device_id usblp_ids[] = {
1434 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 1) },
1435 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 2) },
1436 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 3) },
1437 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 1) },
1438 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 2) },
1439 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 3) },
1440 { USB_DEVICE(0x04b8, 0x0202) }, /* Seiko Epson Receipt Printer M129C */
1441 { } /* Terminating entry */
1442 };
1443
1444 MODULE_DEVICE_TABLE(usb, usblp_ids);
1445
1446 static struct usb_driver usblp_driver = {
1447 .name = "usblp",
1448 .probe = usblp_probe,
1449 .disconnect = usblp_disconnect,
1450 .suspend = usblp_suspend,
1451 .resume = usblp_resume,
1452 .id_table = usblp_ids,
1453 .dev_groups = usblp_groups,
1454 .supports_autosuspend = 1,
1455 };
1456
1457 module_usb_driver(usblp_driver);
1458
1459 MODULE_AUTHOR(DRIVER_AUTHOR);
1460 MODULE_DESCRIPTION(DRIVER_DESC);
1461 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1462 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1463 MODULE_LICENSE("GPL");
Linux with added FPC-III support