1 /*
2 * usblp.c
3 *
4 * Copyright (c) 1999 Michael Gee <michael@linuxspecific.com>
5 * Copyright (c) 1999 Pavel Machek <pavel@ucw.cz>
6 * Copyright (c) 2000 Randy Dunlap <rdunlap@xenotime.net>
7 * Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz>
8 # Copyright (c) 2001 Pete Zaitcev <zaitcev@redhat.com>
9 # Copyright (c) 2001 David Paschal <paschal@rcsis.com>
10 * Copyright (c) 2006 Oliver Neukum <oliver@neukum.name>
11 *
12 * USB Printer Device Class driver for USB printers and printer cables
13 *
14 * Sponsored by SuSE
15 *
16 * ChangeLog:
17 * v0.1 - thorough cleaning, URBification, almost a rewrite
18 * v0.2 - some more cleanups
19 * v0.3 - cleaner again, waitqueue fixes
20 * v0.4 - fixes in unidirectional mode
21 * v0.5 - add DEVICE_ID string support
22 * v0.6 - never time out
23 * v0.7 - fixed bulk-IN read and poll (David Paschal)
24 * v0.8 - add devfs support
25 * v0.9 - fix unplug-while-open paths
26 * v0.10- remove sleep_on, fix error on oom (oliver@neukum.org)
27 * v0.11 - add proto_bias option (Pete Zaitcev)
28 * v0.12 - add hpoj.sourceforge.net ioctls (David Paschal)
29 * v0.13 - alloc space for statusbuf (<status> not on stack);
30 * use usb_alloc_coherent() for read buf & write buf;
31 * none - Maintained in Linux kernel after v0.13
32 */
33
34 /*
35 * This program is free software; you can redistribute it and/or modify
36 * it under the terms of the GNU General Public License as published by
37 * the Free Software Foundation; either version 2 of the License, or
38 * (at your option) any later version.
39 *
40 * This program is distributed in the hope that it will be useful,
41 * but WITHOUT ANY WARRANTY; without even the implied warranty of
42 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
43 * GNU General Public License for more details.
44 *
45 * You should have received a copy of the GNU General Public License
46 * along with this program; if not, write to the Free Software
47 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
48 */
49
50 #include <linux/module.h>
51 #include <linux/kernel.h>
52 #include <linux/sched.h>
53 #include <linux/signal.h>
54 #include <linux/poll.h>
55 #include <linux/slab.h>
56 #include <linux/lp.h>
57 #include <linux/mutex.h>
58 #undef DEBUG
59 #include <linux/usb.h>
60 #include <linux/usb/ch9.h>
61 #include <linux/ratelimit.h>
62
63 /*
64 * Version Information
65 */
66 #define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal"
67 #define DRIVER_DESC "USB Printer Device Class driver"
68
69 #define USBLP_BUF_SIZE 8192
70 #define USBLP_BUF_SIZE_IN 1024
71 #define USBLP_DEVICE_ID_SIZE 1024
72
73 /* ioctls: */
74 #define IOCNR_GET_DEVICE_ID 1
75 #define IOCNR_GET_PROTOCOLS 2
76 #define IOCNR_SET_PROTOCOL 3
77 #define IOCNR_HP_SET_CHANNEL 4
78 #define IOCNR_GET_BUS_ADDRESS 5
79 #define IOCNR_GET_VID_PID 6
80 #define IOCNR_SOFT_RESET 7
81 /* Get device_id string: */
82 #define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len)
83 /* The following ioctls were added for http://hpoj.sourceforge.net:
84 * Get two-int array:
85 * [0]=current protocol
86 * (1=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2,
87 * 3=USB_CLASS_PRINTER/1/3),
88 * [1]=supported protocol mask (mask&(1<<n)!=0 means
89 * USB_CLASS_PRINTER/1/n supported):
90 */
91 #define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
92 /*
93 * Set protocol
94 * (arg: 1=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2,
95 * 3=USB_CLASS_PRINTER/1/3):
96 */
97 #define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0)
98 /* Set channel number (HP Vendor-specific command): */
99 #define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0)
100 /* Get two-int array: [0]=bus number, [1]=device address: */
101 #define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len)
102 /* Get two-int array: [0]=vendor ID, [1]=product ID: */
103 #define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len)
104 /* Perform class specific soft reset */
105 #define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0);
106
107 /*
108 * A DEVICE_ID string may include the printer's serial number.
109 * It should end with a semi-colon (';').
110 * An example from an HP 970C DeskJet printer is (this is one long string,
111 * with the serial number changed):
112 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: ;
113 */
114
115 /*
116 * USB Printer Requests
117 */
118
119 #define USBLP_REQ_GET_ID 0x00
120 #define USBLP_REQ_GET_STATUS 0x01
121 #define USBLP_REQ_RESET 0x02
122 #define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST 0x00 /* HP Vendor-specific */
123
124 #define USBLP_MINORS 16
125 #define USBLP_MINOR_BASE 0
126
127 #define USBLP_CTL_TIMEOUT 5000 /* 5 seconds */
128
129 #define USBLP_FIRST_PROTOCOL 1
130 #define USBLP_LAST_PROTOCOL 3
131 #define USBLP_MAX_PROTOCOLS (USBLP_LAST_PROTOCOL+1)
132
133 /*
134 * some arbitrary status buffer size;
135 * need a status buffer that is allocated via kmalloc(), not on stack
136 */
137 #define STATUS_BUF_SIZE 8
138
139 /*
140 * Locks down the locking order:
141 * ->wmut locks wstatus.
142 * ->mut locks the whole usblp, except [rw]complete, and thus, by indirection,
143 * [rw]status. We only touch status when we know the side idle.
144 * ->lock locks what interrupt accesses.
145 */
146 struct usblp {
147 struct usb_device *dev; /* USB device */
148 struct mutex wmut;
149 struct mutex mut;
150 spinlock_t lock; /* locks rcomplete, wcomplete */
151 char *readbuf; /* read transfer_buffer */
152 char *statusbuf; /* status transfer_buffer */
153 struct usb_anchor urbs;
154 wait_queue_head_t rwait, wwait;
155 int readcount; /* Counter for reads */
156 int ifnum; /* Interface number */
157 struct usb_interface *intf; /* The interface */
158 /*
159 * Alternate-setting numbers and endpoints for each protocol
160 * (USB_CLASS_PRINTER/1/{index=1,2,3}) that the device supports:
161 */
162 struct {
163 int alt_setting;
164 struct usb_endpoint_descriptor *epwrite;
165 struct usb_endpoint_descriptor *epread;
166 } protocol[USBLP_MAX_PROTOCOLS];
167 int current_protocol;
168 int minor; /* minor number of device */
169 int wcomplete, rcomplete;
170 int wstatus; /* bytes written or error */
171 int rstatus; /* bytes ready or error */
172 unsigned int quirks; /* quirks flags */
173 unsigned int flags; /* mode flags */
174 unsigned char used; /* True if open */
175 unsigned char present; /* True if not disconnected */
176 unsigned char bidir; /* interface is bidirectional */
177 unsigned char no_paper; /* Paper Out happened */
178 unsigned char *device_id_string; /* IEEE 1284 DEVICE ID string (ptr) */
179 /* first 2 bytes are (big-endian) length */
180 };
181
182 #ifdef DEBUG
usblp_dump(struct usblp * usblp)183 static void usblp_dump(struct usblp *usblp)
184 {
185 struct device *dev = &usblp->intf->dev;
186 int p;
187
188 dev_dbg(dev, "usblp=0x%p\n", usblp);
189 dev_dbg(dev, "dev=0x%p\n", usblp->dev);
190 dev_dbg(dev, "present=%d\n", usblp->present);
191 dev_dbg(dev, "readbuf=0x%p\n", usblp->readbuf);
192 dev_dbg(dev, "readcount=%d\n", usblp->readcount);
193 dev_dbg(dev, "ifnum=%d\n", usblp->ifnum);
194 for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
195 dev_dbg(dev, "protocol[%d].alt_setting=%d\n", p,
196 usblp->protocol[p].alt_setting);
197 dev_dbg(dev, "protocol[%d].epwrite=%p\n", p,
198 usblp->protocol[p].epwrite);
199 dev_dbg(dev, "protocol[%d].epread=%p\n", p,
200 usblp->protocol[p].epread);
201 }
202 dev_dbg(dev, "current_protocol=%d\n", usblp->current_protocol);
203 dev_dbg(dev, "minor=%d\n", usblp->minor);
204 dev_dbg(dev, "wstatus=%d\n", usblp->wstatus);
205 dev_dbg(dev, "rstatus=%d\n", usblp->rstatus);
206 dev_dbg(dev, "quirks=%d\n", usblp->quirks);
207 dev_dbg(dev, "used=%d\n", usblp->used);
208 dev_dbg(dev, "bidir=%d\n", usblp->bidir);
209 dev_dbg(dev, "device_id_string=\"%s\"\n",
210 usblp->device_id_string ?
211 usblp->device_id_string + 2 :
212 (unsigned char *)"(null)");
213 }
214 #endif
215
216 /* Quirks: various printer quirks are handled by this table & its flags. */
217
218 struct quirk_printer_struct {
219 __u16 vendorId;
220 __u16 productId;
221 unsigned int quirks;
222 };
223
224 #define USBLP_QUIRK_BIDIR 0x1 /* reports bidir but requires unidirectional mode (no INs/reads) */
225 #define USBLP_QUIRK_USB_INIT 0x2 /* needs vendor USB init string */
226 #define USBLP_QUIRK_BAD_CLASS 0x4 /* descriptor uses vendor-specific Class or SubClass */
227
228 static const struct quirk_printer_struct quirk_printers[] = {
229 { 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
230 { 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
231 { 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
232 { 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
233 { 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
234 { 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
235 { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */
236 { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */
237 { 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
238 { 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
239 { 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
240 { 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
241 { 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
242 { 0x0482, 0x0010, USBLP_QUIRK_BIDIR }, /* Kyocera Mita FS 820, by zut <kernel@zut.de> */
243 { 0x04f9, 0x000d, USBLP_QUIRK_BIDIR }, /* Brother Industries, Ltd HL-1440 Laser Printer */
244 { 0x04b8, 0x0202, USBLP_QUIRK_BAD_CLASS }, /* Seiko Epson Receipt Printer M129C */
245 { 0, 0 }
246 };
247
248 static int usblp_wwait(struct usblp *usblp, int nonblock);
249 static int usblp_wtest(struct usblp *usblp, int nonblock);
250 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock);
251 static int usblp_rtest(struct usblp *usblp, int nonblock);
252 static int usblp_submit_read(struct usblp *usblp);
253 static int usblp_select_alts(struct usblp *usblp);
254 static int usblp_set_protocol(struct usblp *usblp, int protocol);
255 static int usblp_cache_device_id_string(struct usblp *usblp);
256
257 /* forward reference to make our lives easier */
258 static struct usb_driver usblp_driver;
259 static DEFINE_MUTEX(usblp_mutex); /* locks the existence of usblp's */
260
261 /*
262 * Functions for usblp control messages.
263 */
264
usblp_ctrl_msg(struct usblp * usblp,int request,int type,int dir,int recip,int value,void * buf,int len)265 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
266 {
267 int retval;
268 int index = usblp->ifnum;
269
270 /* High byte has the interface index.
271 Low byte has the alternate setting.
272 */
273 if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS))
274 index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
275
276 retval = usb_control_msg(usblp->dev,
277 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
278 request, type | dir | recip, value, index, buf, len, USBLP_CTL_TIMEOUT);
279 dev_dbg(&usblp->intf->dev,
280 "usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d\n",
281 request, !!dir, recip, value, index, len, retval);
282 return retval < 0 ? retval : 0;
283 }
284
285 #define usblp_read_status(usblp, status)\
286 usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
287 #define usblp_get_id(usblp, config, id, maxlen)\
288 usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
289 #define usblp_reset(usblp)\
290 usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
291
usblp_hp_channel_change_request(struct usblp * usblp,int channel,u8 * new_channel)292 static int usblp_hp_channel_change_request(struct usblp *usblp, int channel, u8 *new_channel)
293 {
294 u8 *buf;
295 int ret;
296
297 buf = kzalloc(1, GFP_KERNEL);
298 if (!buf)
299 return -ENOMEM;
300
301 ret = usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST,
302 USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE,
303 channel, buf, 1);
304 if (ret == 0)
305 *new_channel = buf[0];
306
307 kfree(buf);
308
309 return ret;
310 }
311
312 /*
313 * See the description for usblp_select_alts() below for the usage
314 * explanation. Look into your /proc/bus/usb/devices and dmesg in
315 * case of any trouble.
316 */
317 static int proto_bias = -1;
318
319 /*
320 * URB callback.
321 */
322
usblp_bulk_read(struct urb * urb)323 static void usblp_bulk_read(struct urb *urb)
324 {
325 struct usblp *usblp = urb->context;
326 int status = urb->status;
327
328 if (usblp->present && usblp->used) {
329 if (status)
330 printk(KERN_WARNING "usblp%d: "
331 "nonzero read bulk status received: %d\n",
332 usblp->minor, status);
333 }
334 spin_lock(&usblp->lock);
335 if (status < 0)
336 usblp->rstatus = status;
337 else
338 usblp->rstatus = urb->actual_length;
339 usblp->rcomplete = 1;
340 wake_up(&usblp->rwait);
341 spin_unlock(&usblp->lock);
342
343 usb_free_urb(urb);
344 }
345
usblp_bulk_write(struct urb * urb)346 static void usblp_bulk_write(struct urb *urb)
347 {
348 struct usblp *usblp = urb->context;
349 int status = urb->status;
350
351 if (usblp->present && usblp->used) {
352 if (status)
353 printk(KERN_WARNING "usblp%d: "
354 "nonzero write bulk status received: %d\n",
355 usblp->minor, status);
356 }
357 spin_lock(&usblp->lock);
358 if (status < 0)
359 usblp->wstatus = status;
360 else
361 usblp->wstatus = urb->actual_length;
362 usblp->no_paper = 0;
363 usblp->wcomplete = 1;
364 wake_up(&usblp->wwait);
365 spin_unlock(&usblp->lock);
366
367 usb_free_urb(urb);
368 }
369
370 /*
371 * Get and print printer errors.
372 */
373
374 static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
375
usblp_check_status(struct usblp * usblp,int err)376 static int usblp_check_status(struct usblp *usblp, int err)
377 {
378 unsigned char status, newerr = 0;
379 int error;
380
381 mutex_lock(&usblp->mut);
382 if ((error = usblp_read_status(usblp, usblp->statusbuf)) < 0) {
383 mutex_unlock(&usblp->mut);
384 printk_ratelimited(KERN_ERR
385 "usblp%d: error %d reading printer status\n",
386 usblp->minor, error);
387 return 0;
388 }
389 status = *usblp->statusbuf;
390 mutex_unlock(&usblp->mut);
391
392 if (~status & LP_PERRORP)
393 newerr = 3;
394 if (status & LP_POUTPA)
395 newerr = 1;
396 if (~status & LP_PSELECD)
397 newerr = 2;
398
399 if (newerr != err) {
400 printk(KERN_INFO "usblp%d: %s\n",
401 usblp->minor, usblp_messages[newerr]);
402 }
403
404 return newerr;
405 }
406
handle_bidir(struct usblp * usblp)407 static int handle_bidir(struct usblp *usblp)
408 {
409 if (usblp->bidir && usblp->used) {
410 if (usblp_submit_read(usblp) < 0)
411 return -EIO;
412 }
413 return 0;
414 }
415
416 /*
417 * File op functions.
418 */
419
usblp_open(struct inode * inode,struct file * file)420 static int usblp_open(struct inode *inode, struct file *file)
421 {
422 int minor = iminor(inode);
423 struct usblp *usblp;
424 struct usb_interface *intf;
425 int retval;
426
427 if (minor < 0)
428 return -ENODEV;
429
430 mutex_lock(&usblp_mutex);
431
432 retval = -ENODEV;
433 intf = usb_find_interface(&usblp_driver, minor);
434 if (!intf)
435 goto out;
436 usblp = usb_get_intfdata(intf);
437 if (!usblp || !usblp->dev || !usblp->present)
438 goto out;
439
440 retval = -EBUSY;
441 if (usblp->used)
442 goto out;
443
444 /*
445 * We do not implement LP_ABORTOPEN/LPABORTOPEN for two reasons:
446 * - We do not want persistent state which close(2) does not clear
447 * - It is not used anyway, according to CUPS people
448 */
449
450 retval = usb_autopm_get_interface(intf);
451 if (retval < 0)
452 goto out;
453 usblp->used = 1;
454 file->private_data = usblp;
455
456 usblp->wcomplete = 1; /* we begin writeable */
457 usblp->wstatus = 0;
458 usblp->rcomplete = 0;
459
460 if (handle_bidir(usblp) < 0) {
461 usb_autopm_put_interface(intf);
462 usblp->used = 0;
463 file->private_data = NULL;
464 retval = -EIO;
465 }
466 out:
467 mutex_unlock(&usblp_mutex);
468 return retval;
469 }
470
usblp_cleanup(struct usblp * usblp)471 static void usblp_cleanup(struct usblp *usblp)
472 {
473 printk(KERN_INFO "usblp%d: removed\n", usblp->minor);
474
475 kfree(usblp->readbuf);
476 kfree(usblp->device_id_string);
477 kfree(usblp->statusbuf);
478 usb_put_intf(usblp->intf);
479 kfree(usblp);
480 }
481
usblp_unlink_urbs(struct usblp * usblp)482 static void usblp_unlink_urbs(struct usblp *usblp)
483 {
484 usb_kill_anchored_urbs(&usblp->urbs);
485 }
486
usblp_release(struct inode * inode,struct file * file)487 static int usblp_release(struct inode *inode, struct file *file)
488 {
489 struct usblp *usblp = file->private_data;
490
491 usblp->flags &= ~LP_ABORT;
492
493 mutex_lock(&usblp_mutex);
494 usblp->used = 0;
495 if (usblp->present)
496 usblp_unlink_urbs(usblp);
497
498 usb_autopm_put_interface(usblp->intf);
499
500 if (!usblp->present) /* finish cleanup from disconnect */
501 usblp_cleanup(usblp); /* any URBs must be dead */
502
503 mutex_unlock(&usblp_mutex);
504 return 0;
505 }
506
507 /* No kernel lock - fine */
usblp_poll(struct file * file,struct poll_table_struct * wait)508 static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
509 {
510 int ret;
511 unsigned long flags;
512
513 struct usblp *usblp = file->private_data;
514 /* Should we check file->f_mode & FMODE_WRITE before poll_wait()? */
515 poll_wait(file, &usblp->rwait, wait);
516 poll_wait(file, &usblp->wwait, wait);
517 spin_lock_irqsave(&usblp->lock, flags);
518 ret = ((usblp->bidir && usblp->rcomplete) ? POLLIN | POLLRDNORM : 0) |
519 ((usblp->no_paper || usblp->wcomplete) ? POLLOUT | POLLWRNORM : 0);
520 spin_unlock_irqrestore(&usblp->lock, flags);
521 return ret;
522 }
523
usblp_ioctl(struct file * file,unsigned int cmd,unsigned long arg)524 static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
525 {
526 struct usblp *usblp = file->private_data;
527 int length, err, i;
528 unsigned char newChannel;
529 int status;
530 int twoints[2];
531 int retval = 0;
532
533 mutex_lock(&usblp->mut);
534 if (!usblp->present) {
535 retval = -ENODEV;
536 goto done;
537 }
538
539 dev_dbg(&usblp->intf->dev,
540 "usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)\n", cmd,
541 _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd));
542
543 if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */
544
545 switch (_IOC_NR(cmd)) {
546
547 case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
548 if (_IOC_DIR(cmd) != _IOC_READ) {
549 retval = -EINVAL;
550 goto done;
551 }
552
553 length = usblp_cache_device_id_string(usblp);
554 if (length < 0) {
555 retval = length;
556 goto done;
557 }
558 if (length > _IOC_SIZE(cmd))
559 length = _IOC_SIZE(cmd); /* truncate */
560
561 if (copy_to_user((void __user *) arg,
562 usblp->device_id_string,
563 (unsigned long) length)) {
564 retval = -EFAULT;
565 goto done;
566 }
567
568 break;
569
570 case IOCNR_GET_PROTOCOLS:
571 if (_IOC_DIR(cmd) != _IOC_READ ||
572 _IOC_SIZE(cmd) < sizeof(twoints)) {
573 retval = -EINVAL;
574 goto done;
575 }
576
577 twoints[0] = usblp->current_protocol;
578 twoints[1] = 0;
579 for (i = USBLP_FIRST_PROTOCOL;
580 i <= USBLP_LAST_PROTOCOL; i++) {
581 if (usblp->protocol[i].alt_setting >= 0)
582 twoints[1] |= (1<<i);
583 }
584
585 if (copy_to_user((void __user *)arg,
586 (unsigned char *)twoints,
587 sizeof(twoints))) {
588 retval = -EFAULT;
589 goto done;
590 }
591
592 break;
593
594 case IOCNR_SET_PROTOCOL:
595 if (_IOC_DIR(cmd) != _IOC_WRITE) {
596 retval = -EINVAL;
597 goto done;
598 }
599
600 #ifdef DEBUG
601 if (arg == -10) {
602 usblp_dump(usblp);
603 break;
604 }
605 #endif
606
607 usblp_unlink_urbs(usblp);
608 retval = usblp_set_protocol(usblp, arg);
609 if (retval < 0) {
610 usblp_set_protocol(usblp,
611 usblp->current_protocol);
612 }
613 break;
614
615 case IOCNR_HP_SET_CHANNEL:
616 if (_IOC_DIR(cmd) != _IOC_WRITE ||
617 le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
618 usblp->quirks & USBLP_QUIRK_BIDIR) {
619 retval = -EINVAL;
620 goto done;
621 }
622
623 err = usblp_hp_channel_change_request(usblp,
624 arg, &newChannel);
625 if (err < 0) {
626 dev_err(&usblp->dev->dev,
627 "usblp%d: error = %d setting "
628 "HP channel\n",
629 usblp->minor, err);
630 retval = -EIO;
631 goto done;
632 }
633
634 dev_dbg(&usblp->intf->dev,
635 "usblp%d requested/got HP channel %ld/%d\n",
636 usblp->minor, arg, newChannel);
637 break;
638
639 case IOCNR_GET_BUS_ADDRESS:
640 if (_IOC_DIR(cmd) != _IOC_READ ||
641 _IOC_SIZE(cmd) < sizeof(twoints)) {
642 retval = -EINVAL;
643 goto done;
644 }
645
646 twoints[0] = usblp->dev->bus->busnum;
647 twoints[1] = usblp->dev->devnum;
648 if (copy_to_user((void __user *)arg,
649 (unsigned char *)twoints,
650 sizeof(twoints))) {
651 retval = -EFAULT;
652 goto done;
653 }
654
655 dev_dbg(&usblp->intf->dev,
656 "usblp%d is bus=%d, device=%d\n",
657 usblp->minor, twoints[0], twoints[1]);
658 break;
659
660 case IOCNR_GET_VID_PID:
661 if (_IOC_DIR(cmd) != _IOC_READ ||
662 _IOC_SIZE(cmd) < sizeof(twoints)) {
663 retval = -EINVAL;
664 goto done;
665 }
666
667 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
668 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
669 if (copy_to_user((void __user *)arg,
670 (unsigned char *)twoints,
671 sizeof(twoints))) {
672 retval = -EFAULT;
673 goto done;
674 }
675
676 dev_dbg(&usblp->intf->dev,
677 "usblp%d is VID=0x%4.4X, PID=0x%4.4X\n",
678 usblp->minor, twoints[0], twoints[1]);
679 break;
680
681 case IOCNR_SOFT_RESET:
682 if (_IOC_DIR(cmd) != _IOC_NONE) {
683 retval = -EINVAL;
684 goto done;
685 }
686 retval = usblp_reset(usblp);
687 break;
688 default:
689 retval = -ENOTTY;
690 }
691 else /* old-style ioctl value */
692 switch (cmd) {
693
694 case LPGETSTATUS:
695 retval = usblp_read_status(usblp, usblp->statusbuf);
696 if (retval) {
697 printk_ratelimited(KERN_ERR "usblp%d:"
698 "failed reading printer status (%d)\n",
699 usblp->minor, retval);
700 retval = -EIO;
701 goto done;
702 }
703 status = *usblp->statusbuf;
704 if (copy_to_user((void __user *)arg, &status, sizeof(int)))
705 retval = -EFAULT;
706 break;
707
708 case LPABORT:
709 if (arg)
710 usblp->flags |= LP_ABORT;
711 else
712 usblp->flags &= ~LP_ABORT;
713 break;
714
715 default:
716 retval = -ENOTTY;
717 }
718
719 done:
720 mutex_unlock(&usblp->mut);
721 return retval;
722 }
723
usblp_new_writeurb(struct usblp * usblp,int transfer_length)724 static struct urb *usblp_new_writeurb(struct usblp *usblp, int transfer_length)
725 {
726 struct urb *urb;
727 char *writebuf;
728
729 writebuf = kmalloc(transfer_length, GFP_KERNEL);
730 if (writebuf == NULL)
731 return NULL;
732 urb = usb_alloc_urb(0, GFP_KERNEL);
733 if (urb == NULL) {
734 kfree(writebuf);
735 return NULL;
736 }
737
738 usb_fill_bulk_urb(urb, usblp->dev,
739 usb_sndbulkpipe(usblp->dev,
740 usblp->protocol[usblp->current_protocol].epwrite->bEndpointAddress),
741 writebuf, transfer_length, usblp_bulk_write, usblp);
742 urb->transfer_flags |= URB_FREE_BUFFER;
743
744 return urb;
745 }
746
usblp_write(struct file * file,const char __user * buffer,size_t count,loff_t * ppos)747 static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
748 {
749 struct usblp *usblp = file->private_data;
750 struct urb *writeurb;
751 int rv;
752 int transfer_length;
753 ssize_t writecount = 0;
754
755 if (mutex_lock_interruptible(&usblp->wmut)) {
756 rv = -EINTR;
757 goto raise_biglock;
758 }
759 if ((rv = usblp_wwait(usblp, !!(file->f_flags & O_NONBLOCK))) < 0)
760 goto raise_wait;
761
762 while (writecount < count) {
763 /*
764 * Step 1: Submit next block.
765 */
766 if ((transfer_length = count - writecount) > USBLP_BUF_SIZE)
767 transfer_length = USBLP_BUF_SIZE;
768
769 rv = -ENOMEM;
770 writeurb = usblp_new_writeurb(usblp, transfer_length);
771 if (writeurb == NULL)
772 goto raise_urb;
773 usb_anchor_urb(writeurb, &usblp->urbs);
774
775 if (copy_from_user(writeurb->transfer_buffer,
776 buffer + writecount, transfer_length)) {
777 rv = -EFAULT;
778 goto raise_badaddr;
779 }
780
781 spin_lock_irq(&usblp->lock);
782 usblp->wcomplete = 0;
783 spin_unlock_irq(&usblp->lock);
784 if ((rv = usb_submit_urb(writeurb, GFP_KERNEL)) < 0) {
785 usblp->wstatus = 0;
786 spin_lock_irq(&usblp->lock);
787 usblp->no_paper = 0;
788 usblp->wcomplete = 1;
789 wake_up(&usblp->wwait);
790 spin_unlock_irq(&usblp->lock);
791 if (rv != -ENOMEM)
792 rv = -EIO;
793 goto raise_submit;
794 }
795
796 /*
797 * Step 2: Wait for transfer to end, collect results.
798 */
799 rv = usblp_wwait(usblp, !!(file->f_flags&O_NONBLOCK));
800 if (rv < 0) {
801 if (rv == -EAGAIN) {
802 /* Presume that it's going to complete well. */
803 writecount += transfer_length;
804 }
805 if (rv == -ENOSPC) {
806 spin_lock_irq(&usblp->lock);
807 usblp->no_paper = 1; /* Mark for poll(2) */
808 spin_unlock_irq(&usblp->lock);
809 writecount += transfer_length;
810 }
811 /* Leave URB dangling, to be cleaned on close. */
812 goto collect_error;
813 }
814
815 if (usblp->wstatus < 0) {
816 rv = -EIO;
817 goto collect_error;
818 }
819 /*
820 * This is critical: it must be our URB, not other writer's.
821 * The wmut exists mainly to cover us here.
822 */
823 writecount += usblp->wstatus;
824 }
825
826 mutex_unlock(&usblp->wmut);
827 return writecount;
828
829 raise_submit:
830 raise_badaddr:
831 usb_unanchor_urb(writeurb);
832 usb_free_urb(writeurb);
833 raise_urb:
834 raise_wait:
835 collect_error: /* Out of raise sequence */
836 mutex_unlock(&usblp->wmut);
837 raise_biglock:
838 return writecount ? writecount : rv;
839 }
840
841 /*
842 * Notice that we fail to restart in a few cases: on EFAULT, on restart
843 * error, etc. This is the historical behaviour. In all such cases we return
844 * EIO, and applications loop in order to get the new read going.
845 */
usblp_read(struct file * file,char __user * buffer,size_t len,loff_t * ppos)846 static ssize_t usblp_read(struct file *file, char __user *buffer, size_t len, loff_t *ppos)
847 {
848 struct usblp *usblp = file->private_data;
849 ssize_t count;
850 ssize_t avail;
851 int rv;
852
853 if (!usblp->bidir)
854 return -EINVAL;
855
856 rv = usblp_rwait_and_lock(usblp, !!(file->f_flags & O_NONBLOCK));
857 if (rv < 0)
858 return rv;
859
860 if (!usblp->present) {
861 count = -ENODEV;
862 goto done;
863 }
864
865 if ((avail = usblp->rstatus) < 0) {
866 printk(KERN_ERR "usblp%d: error %d reading from printer\n",
867 usblp->minor, (int)avail);
868 usblp_submit_read(usblp);
869 count = -EIO;
870 goto done;
871 }
872
873 count = len < avail - usblp->readcount ? len : avail - usblp->readcount;
874 if (count != 0 &&
875 copy_to_user(buffer, usblp->readbuf + usblp->readcount, count)) {
876 count = -EFAULT;
877 goto done;
878 }
879
880 if ((usblp->readcount += count) == avail) {
881 if (usblp_submit_read(usblp) < 0) {
882 /* We don't want to leak USB return codes into errno. */
883 if (count == 0)
884 count = -EIO;
885 goto done;
886 }
887 }
888
889 done:
890 mutex_unlock(&usblp->mut);
891 return count;
892 }
893
894 /*
895 * Wait for the write path to come idle.
896 * This is called under the ->wmut, so the idle path stays idle.
897 *
898 * Our write path has a peculiar property: it does not buffer like a tty,
899 * but waits for the write to succeed. This allows our ->release to bug out
900 * without waiting for writes to drain. But it obviously does not work
901 * when O_NONBLOCK is set. So, applications setting O_NONBLOCK must use
902 * select(2) or poll(2) to wait for the buffer to drain before closing.
903 * Alternatively, set blocking mode with fcntl and issue a zero-size write.
904 */
usblp_wwait(struct usblp * usblp,int nonblock)905 static int usblp_wwait(struct usblp *usblp, int nonblock)
906 {
907 DECLARE_WAITQUEUE(waita, current);
908 int rc;
909 int err = 0;
910
911 add_wait_queue(&usblp->wwait, &waita);
912 for (;;) {
913 if (mutex_lock_interruptible(&usblp->mut)) {
914 rc = -EINTR;
915 break;
916 }
917 set_current_state(TASK_INTERRUPTIBLE);
918 rc = usblp_wtest(usblp, nonblock);
919 mutex_unlock(&usblp->mut);
920 if (rc <= 0)
921 break;
922
923 if (schedule_timeout(msecs_to_jiffies(1500)) == 0) {
924 if (usblp->flags & LP_ABORT) {
925 err = usblp_check_status(usblp, err);
926 if (err == 1) { /* Paper out */
927 rc = -ENOSPC;
928 break;
929 }
930 } else {
931 /* Prod the printer, Gentoo#251237. */
932 mutex_lock(&usblp->mut);
933 usblp_read_status(usblp, usblp->statusbuf);
934 mutex_unlock(&usblp->mut);
935 }
936 }
937 }
938 set_current_state(TASK_RUNNING);
939 remove_wait_queue(&usblp->wwait, &waita);
940 return rc;
941 }
942
usblp_wtest(struct usblp * usblp,int nonblock)943 static int usblp_wtest(struct usblp *usblp, int nonblock)
944 {
945 unsigned long flags;
946
947 if (!usblp->present)
948 return -ENODEV;
949 if (signal_pending(current))
950 return -EINTR;
951 spin_lock_irqsave(&usblp->lock, flags);
952 if (usblp->wcomplete) {
953 spin_unlock_irqrestore(&usblp->lock, flags);
954 return 0;
955 }
956 spin_unlock_irqrestore(&usblp->lock, flags);
957 if (nonblock)
958 return -EAGAIN;
959 return 1;
960 }
961
962 /*
963 * Wait for read bytes to become available. This probably should have been
964 * called usblp_r_lock_and_wait(), because we lock first. But it's a traditional
965 * name for functions which lock and return.
966 *
967 * We do not use wait_event_interruptible because it makes locking iffy.
968 */
usblp_rwait_and_lock(struct usblp * usblp,int nonblock)969 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock)
970 {
971 DECLARE_WAITQUEUE(waita, current);
972 int rc;
973
974 add_wait_queue(&usblp->rwait, &waita);
975 for (;;) {
976 if (mutex_lock_interruptible(&usblp->mut)) {
977 rc = -EINTR;
978 break;
979 }
980 set_current_state(TASK_INTERRUPTIBLE);
981 if ((rc = usblp_rtest(usblp, nonblock)) < 0) {
982 mutex_unlock(&usblp->mut);
983 break;
984 }
985 if (rc == 0) /* Keep it locked */
986 break;
987 mutex_unlock(&usblp->mut);
988 schedule();
989 }
990 set_current_state(TASK_RUNNING);
991 remove_wait_queue(&usblp->rwait, &waita);
992 return rc;
993 }
994
usblp_rtest(struct usblp * usblp,int nonblock)995 static int usblp_rtest(struct usblp *usblp, int nonblock)
996 {
997 unsigned long flags;
998
999 if (!usblp->present)
1000 return -ENODEV;
1001 if (signal_pending(current))
1002 return -EINTR;
1003 spin_lock_irqsave(&usblp->lock, flags);
1004 if (usblp->rcomplete) {
1005 spin_unlock_irqrestore(&usblp->lock, flags);
1006 return 0;
1007 }
1008 spin_unlock_irqrestore(&usblp->lock, flags);
1009 if (nonblock)
1010 return -EAGAIN;
1011 return 1;
1012 }
1013
1014 /*
1015 * Please check ->bidir and other such things outside for now.
1016 */
usblp_submit_read(struct usblp * usblp)1017 static int usblp_submit_read(struct usblp *usblp)
1018 {
1019 struct urb *urb;
1020 unsigned long flags;
1021 int rc;
1022
1023 rc = -ENOMEM;
1024 urb = usb_alloc_urb(0, GFP_KERNEL);
1025 if (urb == NULL)
1026 goto raise_urb;
1027
1028 usb_fill_bulk_urb(urb, usblp->dev,
1029 usb_rcvbulkpipe(usblp->dev,
1030 usblp->protocol[usblp->current_protocol].epread->bEndpointAddress),
1031 usblp->readbuf, USBLP_BUF_SIZE_IN,
1032 usblp_bulk_read, usblp);
1033 usb_anchor_urb(urb, &usblp->urbs);
1034
1035 spin_lock_irqsave(&usblp->lock, flags);
1036 usblp->readcount = 0; /* XXX Why here? */
1037 usblp->rcomplete = 0;
1038 spin_unlock_irqrestore(&usblp->lock, flags);
1039 if ((rc = usb_submit_urb(urb, GFP_KERNEL)) < 0) {
1040 dev_dbg(&usblp->intf->dev, "error submitting urb (%d)\n", rc);
1041 spin_lock_irqsave(&usblp->lock, flags);
1042 usblp->rstatus = rc;
1043 usblp->rcomplete = 1;
1044 spin_unlock_irqrestore(&usblp->lock, flags);
1045 goto raise_submit;
1046 }
1047
1048 return 0;
1049
1050 raise_submit:
1051 usb_unanchor_urb(urb);
1052 usb_free_urb(urb);
1053 raise_urb:
1054 return rc;
1055 }
1056
1057 /*
1058 * Checks for printers that have quirks, such as requiring unidirectional
1059 * communication but reporting bidirectional; currently some HP printers
1060 * have this flaw (HP 810, 880, 895, etc.), or needing an init string
1061 * sent at each open (like some Epsons).
1062 * Returns 1 if found, 0 if not found.
1063 *
1064 * HP recommended that we use the bidirectional interface but
1065 * don't attempt any bulk IN transfers from the IN endpoint.
1066 * Here's some more detail on the problem:
1067 * The problem is not that it isn't bidirectional though. The problem
1068 * is that if you request a device ID, or status information, while
1069 * the buffers are full, the return data will end up in the print data
1070 * buffer. For example if you make sure you never request the device ID
1071 * while you are sending print data, and you don't try to query the
1072 * printer status every couple of milliseconds, you will probably be OK.
1073 */
usblp_quirks(__u16 vendor,__u16 product)1074 static unsigned int usblp_quirks(__u16 vendor, __u16 product)
1075 {
1076 int i;
1077
1078 for (i = 0; quirk_printers[i].vendorId; i++) {
1079 if (vendor == quirk_printers[i].vendorId &&
1080 product == quirk_printers[i].productId)
1081 return quirk_printers[i].quirks;
1082 }
1083 return 0;
1084 }
1085
1086 static const struct file_operations usblp_fops = {
1087 .owner = THIS_MODULE,
1088 .read = usblp_read,
1089 .write = usblp_write,
1090 .poll = usblp_poll,
1091 .unlocked_ioctl = usblp_ioctl,
1092 .compat_ioctl = usblp_ioctl,
1093 .open = usblp_open,
1094 .release = usblp_release,
1095 .llseek = noop_llseek,
1096 };
1097
usblp_devnode(struct device * dev,umode_t * mode)1098 static char *usblp_devnode(struct device *dev, umode_t *mode)
1099 {
1100 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
1101 }
1102
1103 static struct usb_class_driver usblp_class = {
1104 .name = "lp%d",
1105 .devnode = usblp_devnode,
1106 .fops = &usblp_fops,
1107 .minor_base = USBLP_MINOR_BASE,
1108 };
1109
usblp_show_ieee1284_id(struct device * dev,struct device_attribute * attr,char * buf)1110 static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf)
1111 {
1112 struct usb_interface *intf = to_usb_interface(dev);
1113 struct usblp *usblp = usb_get_intfdata(intf);
1114
1115 if (usblp->device_id_string[0] == 0 &&
1116 usblp->device_id_string[1] == 0)
1117 return 0;
1118
1119 return sprintf(buf, "%s", usblp->device_id_string+2);
1120 }
1121
1122 static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL);
1123
usblp_probe(struct usb_interface * intf,const struct usb_device_id * id)1124 static int usblp_probe(struct usb_interface *intf,
1125 const struct usb_device_id *id)
1126 {
1127 struct usb_device *dev = interface_to_usbdev(intf);
1128 struct usblp *usblp;
1129 int protocol;
1130 int retval;
1131
1132 /* Malloc and start initializing usblp structure so we can use it
1133 * directly. */
1134 usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL);
1135 if (!usblp) {
1136 retval = -ENOMEM;
1137 goto abort_ret;
1138 }
1139 usblp->dev = dev;
1140 mutex_init(&usblp->wmut);
1141 mutex_init(&usblp->mut);
1142 spin_lock_init(&usblp->lock);
1143 init_waitqueue_head(&usblp->rwait);
1144 init_waitqueue_head(&usblp->wwait);
1145 init_usb_anchor(&usblp->urbs);
1146 usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
1147 usblp->intf = usb_get_intf(intf);
1148
1149 /* Malloc device ID string buffer to the largest expected length,
1150 * since we can re-query it on an ioctl and a dynamic string
1151 * could change in length. */
1152 if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
1153 retval = -ENOMEM;
1154 goto abort;
1155 }
1156
1157 /*
1158 * Allocate read buffer. We somewhat wastefully
1159 * malloc both regardless of bidirectionality, because the
1160 * alternate setting can be changed later via an ioctl.
1161 */
1162 if (!(usblp->readbuf = kmalloc(USBLP_BUF_SIZE_IN, GFP_KERNEL))) {
1163 retval = -ENOMEM;
1164 goto abort;
1165 }
1166
1167 /* Allocate buffer for printer status */
1168 usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
1169 if (!usblp->statusbuf) {
1170 retval = -ENOMEM;
1171 goto abort;
1172 }
1173
1174 /* Lookup quirks for this printer. */
1175 usblp->quirks = usblp_quirks(
1176 le16_to_cpu(dev->descriptor.idVendor),
1177 le16_to_cpu(dev->descriptor.idProduct));
1178
1179 /* Analyze and pick initial alternate settings and endpoints. */
1180 protocol = usblp_select_alts(usblp);
1181 if (protocol < 0) {
1182 dev_dbg(&intf->dev,
1183 "incompatible printer-class device 0x%4.4X/0x%4.4X\n",
1184 le16_to_cpu(dev->descriptor.idVendor),
1185 le16_to_cpu(dev->descriptor.idProduct));
1186 retval = -ENODEV;
1187 goto abort;
1188 }
1189
1190 /* Setup the selected alternate setting and endpoints. */
1191 if (usblp_set_protocol(usblp, protocol) < 0) {
1192 retval = -ENODEV; /* ->probe isn't ->ioctl */
1193 goto abort;
1194 }
1195
1196 /* Retrieve and store the device ID string. */
1197 usblp_cache_device_id_string(usblp);
1198 retval = device_create_file(&intf->dev, &dev_attr_ieee1284_id);
1199 if (retval)
1200 goto abort_intfdata;
1201
1202 #ifdef DEBUG
1203 usblp_check_status(usblp, 0);
1204 #endif
1205
1206 usb_set_intfdata(intf, usblp);
1207
1208 usblp->present = 1;
1209
1210 retval = usb_register_dev(intf, &usblp_class);
1211 if (retval) {
1212 dev_err(&intf->dev,
1213 "usblp: Not able to get a minor (base %u, slice default): %d\n",
1214 USBLP_MINOR_BASE, retval);
1215 goto abort_intfdata;
1216 }
1217 usblp->minor = intf->minor;
1218 dev_info(&intf->dev,
1219 "usblp%d: USB %sdirectional printer dev %d if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X\n",
1220 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
1221 usblp->ifnum,
1222 usblp->protocol[usblp->current_protocol].alt_setting,
1223 usblp->current_protocol,
1224 le16_to_cpu(usblp->dev->descriptor.idVendor),
1225 le16_to_cpu(usblp->dev->descriptor.idProduct));
1226
1227 return 0;
1228
1229 abort_intfdata:
1230 usb_set_intfdata(intf, NULL);
1231 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1232 abort:
1233 kfree(usblp->readbuf);
1234 kfree(usblp->statusbuf);
1235 kfree(usblp->device_id_string);
1236 usb_put_intf(usblp->intf);
1237 kfree(usblp);
1238 abort_ret:
1239 return retval;
1240 }
1241
1242 /*
1243 * We are a "new" style driver with usb_device_id table,
1244 * but our requirements are too intricate for simple match to handle.
1245 *
1246 * The "proto_bias" option may be used to specify the preferred protocol
1247 * for all USB printers (1=USB_CLASS_PRINTER/1/1, 2=USB_CLASS_PRINTER/1/2,
1248 * 3=USB_CLASS_PRINTER/1/3). If the device supports the preferred protocol,
1249 * then we bind to it.
1250 *
1251 * The best interface for us is USB_CLASS_PRINTER/1/2, because it
1252 * is compatible with a stream of characters. If we find it, we bind to it.
1253 *
1254 * Note that the people from hpoj.sourceforge.net need to be able to
1255 * bind to USB_CLASS_PRINTER/1/3 (MLC/1284.4), so we provide them ioctls
1256 * for this purpose.
1257 *
1258 * Failing USB_CLASS_PRINTER/1/2, we look for USB_CLASS_PRINTER/1/3,
1259 * even though it's probably not stream-compatible, because this matches
1260 * the behaviour of the old code.
1261 *
1262 * If nothing else, we bind to USB_CLASS_PRINTER/1/1
1263 * - the unidirectional interface.
1264 */
usblp_select_alts(struct usblp * usblp)1265 static int usblp_select_alts(struct usblp *usblp)
1266 {
1267 struct usb_interface *if_alt;
1268 struct usb_host_interface *ifd;
1269 struct usb_endpoint_descriptor *epd, *epwrite, *epread;
1270 int p, i, e;
1271
1272 if_alt = usblp->intf;
1273
1274 for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
1275 usblp->protocol[p].alt_setting = -1;
1276
1277 /* Find out what we have. */
1278 for (i = 0; i < if_alt->num_altsetting; i++) {
1279 ifd = &if_alt->altsetting[i];
1280
1281 if (ifd->desc.bInterfaceClass != USB_CLASS_PRINTER ||
1282 ifd->desc.bInterfaceSubClass != 1)
1283 if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS))
1284 continue;
1285
1286 if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
1287 ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
1288 continue;
1289
1290 /* Look for bulk OUT and IN endpoints. */
1291 epwrite = epread = NULL;
1292 for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
1293 epd = &ifd->endpoint[e].desc;
1294
1295 if (usb_endpoint_is_bulk_out(epd))
1296 if (!epwrite)
1297 epwrite = epd;
1298
1299 if (usb_endpoint_is_bulk_in(epd))
1300 if (!epread)
1301 epread = epd;
1302 }
1303
1304 /* Ignore buggy hardware without the right endpoints. */
1305 if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
1306 continue;
1307
1308 /*
1309 * Turn off reads for USB_CLASS_PRINTER/1/1 (unidirectional)
1310 * interfaces and buggy bidirectional printers.
1311 */
1312 if (ifd->desc.bInterfaceProtocol == 1) {
1313 epread = NULL;
1314 } else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
1315 printk(KERN_INFO "usblp%d: Disabling reads from "
1316 "problematic bidirectional printer\n",
1317 usblp->minor);
1318 epread = NULL;
1319 }
1320
1321 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
1322 ifd->desc.bAlternateSetting;
1323 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
1324 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
1325 }
1326
1327 /* If our requested protocol is supported, then use it. */
1328 if (proto_bias >= USBLP_FIRST_PROTOCOL &&
1329 proto_bias <= USBLP_LAST_PROTOCOL &&
1330 usblp->protocol[proto_bias].alt_setting != -1)
1331 return proto_bias;
1332
1333 /* Ordering is important here. */
1334 if (usblp->protocol[2].alt_setting != -1)
1335 return 2;
1336 if (usblp->protocol[1].alt_setting != -1)
1337 return 1;
1338 if (usblp->protocol[3].alt_setting != -1)
1339 return 3;
1340
1341 /* If nothing is available, then don't bind to this device. */
1342 return -1;
1343 }
1344
usblp_set_protocol(struct usblp * usblp,int protocol)1345 static int usblp_set_protocol(struct usblp *usblp, int protocol)
1346 {
1347 int r, alts;
1348
1349 if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
1350 return -EINVAL;
1351
1352 /* Don't unnecessarily set the interface if there's a single alt. */
1353 if (usblp->intf->num_altsetting > 1) {
1354 alts = usblp->protocol[protocol].alt_setting;
1355 if (alts < 0)
1356 return -EINVAL;
1357 r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
1358 if (r < 0) {
1359 printk(KERN_ERR "usblp: can't set desired altsetting %d on interface %d\n",
1360 alts, usblp->ifnum);
1361 return r;
1362 }
1363 }
1364
1365 usblp->bidir = (usblp->protocol[protocol].epread != NULL);
1366 usblp->current_protocol = protocol;
1367 dev_dbg(&usblp->intf->dev, "usblp%d set protocol %d\n",
1368 usblp->minor, protocol);
1369 return 0;
1370 }
1371
1372 /* Retrieves and caches device ID string.
1373 * Returns length, including length bytes but not null terminator.
1374 * On error, returns a negative errno value. */
usblp_cache_device_id_string(struct usblp * usblp)1375 static int usblp_cache_device_id_string(struct usblp *usblp)
1376 {
1377 int err, length;
1378
1379 err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
1380 if (err < 0) {
1381 dev_dbg(&usblp->intf->dev,
1382 "usblp%d: error = %d reading IEEE-1284 Device ID string\n",
1383 usblp->minor, err);
1384 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
1385 return -EIO;
1386 }
1387
1388 /* First two bytes are length in big-endian.
1389 * They count themselves, and we copy them into
1390 * the user's buffer. */
1391 length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
1392 if (length < 2)
1393 length = 2;
1394 else if (length >= USBLP_DEVICE_ID_SIZE)
1395 length = USBLP_DEVICE_ID_SIZE - 1;
1396 usblp->device_id_string[length] = '\0';
1397
1398 dev_dbg(&usblp->intf->dev, "usblp%d Device ID string [len=%d]=\"%s\"\n",
1399 usblp->minor, length, &usblp->device_id_string[2]);
1400
1401 return length;
1402 }
1403
usblp_disconnect(struct usb_interface * intf)1404 static void usblp_disconnect(struct usb_interface *intf)
1405 {
1406 struct usblp *usblp = usb_get_intfdata(intf);
1407
1408 usb_deregister_dev(intf, &usblp_class);
1409
1410 if (!usblp || !usblp->dev) {
1411 dev_err(&intf->dev, "bogus disconnect\n");
1412 BUG();
1413 }
1414
1415 device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
1416
1417 mutex_lock(&usblp_mutex);
1418 mutex_lock(&usblp->mut);
1419 usblp->present = 0;
1420 wake_up(&usblp->wwait);
1421 wake_up(&usblp->rwait);
1422 usb_set_intfdata(intf, NULL);
1423
1424 usblp_unlink_urbs(usblp);
1425 mutex_unlock(&usblp->mut);
1426 usb_poison_anchored_urbs(&usblp->urbs);
1427
1428 if (!usblp->used)
1429 usblp_cleanup(usblp);
1430
1431 mutex_unlock(&usblp_mutex);
1432 }
1433
usblp_suspend(struct usb_interface * intf,pm_message_t message)1434 static int usblp_suspend(struct usb_interface *intf, pm_message_t message)
1435 {
1436 struct usblp *usblp = usb_get_intfdata(intf);
1437
1438 usblp_unlink_urbs(usblp);
1439 #if 0 /* XXX Do we want this? What if someone is reading, should we fail? */
1440 /* not strictly necessary, but just in case */
1441 wake_up(&usblp->wwait);
1442 wake_up(&usblp->rwait);
1443 #endif
1444
1445 return 0;
1446 }
1447
usblp_resume(struct usb_interface * intf)1448 static int usblp_resume(struct usb_interface *intf)
1449 {
1450 struct usblp *usblp = usb_get_intfdata(intf);
1451 int r;
1452
1453 r = handle_bidir(usblp);
1454
1455 return r;
1456 }
1457
1458 static const struct usb_device_id usblp_ids[] = {
1459 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 1) },
1460 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 2) },
1461 { USB_DEVICE_INFO(USB_CLASS_PRINTER, 1, 3) },
1462 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 1) },
1463 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 2) },
1464 { USB_INTERFACE_INFO(USB_CLASS_PRINTER, 1, 3) },
1465 { USB_DEVICE(0x04b8, 0x0202) }, /* Seiko Epson Receipt Printer M129C */
1466 { } /* Terminating entry */
1467 };
1468
1469 MODULE_DEVICE_TABLE(usb, usblp_ids);
1470
1471 static struct usb_driver usblp_driver = {
1472 .name = "usblp",
1473 .probe = usblp_probe,
1474 .disconnect = usblp_disconnect,
1475 .suspend = usblp_suspend,
1476 .resume = usblp_resume,
1477 .id_table = usblp_ids,
1478 .supports_autosuspend = 1,
1479 };
1480
1481 module_usb_driver(usblp_driver);
1482
1483 MODULE_AUTHOR(DRIVER_AUTHOR);
1484 MODULE_DESCRIPTION(DRIVER_DESC);
1485 module_param(proto_bias, int, S_IRUGO | S_IWUSR);
1486 MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
1487 MODULE_LICENSE("GPL");
1488