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Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
317c67b8 | 2 | * usblp.c |
1da177e4 LT |
3 | * |
4 | * Copyright (c) 1999 Michael Gee <michael@linuxspecific.com> | |
a2531293 | 5 | * Copyright (c) 1999 Pavel Machek <pavel@ucw.cz> |
f4b09ebc | 6 | * Copyright (c) 2000 Randy Dunlap <rdunlap@xenotime.net> |
1da177e4 LT |
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> | |
8e695cdb | 10 | * Copyright (c) 2006 Oliver Neukum <oliver@neukum.name> |
1da177e4 LT |
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); | |
997ea58e | 30 | * use usb_alloc_coherent() for read buf & write buf; |
283face8 | 31 | * none - Maintained in Linux kernel after v0.13 |
1da177e4 LT |
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> | |
1da177e4 LT |
53 | #include <linux/signal.h> |
54 | #include <linux/poll.h> | |
55 | #include <linux/init.h> | |
56 | #include <linux/slab.h> | |
57 | #include <linux/lp.h> | |
4186ecf8 | 58 | #include <linux/mutex.h> |
1da177e4 LT |
59 | #undef DEBUG |
60 | #include <linux/usb.h> | |
61 | ||
62 | /* | |
63 | * Version Information | |
64 | */ | |
1da177e4 LT |
65 | #define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal" |
66 | #define DRIVER_DESC "USB Printer Device Class driver" | |
67 | ||
68 | #define USBLP_BUF_SIZE 8192 | |
317c67b8 | 69 | #define USBLP_BUF_SIZE_IN 1024 |
1da177e4 LT |
70 | #define USBLP_DEVICE_ID_SIZE 1024 |
71 | ||
72 | /* ioctls: */ | |
1da177e4 LT |
73 | #define IOCNR_GET_DEVICE_ID 1 |
74 | #define IOCNR_GET_PROTOCOLS 2 | |
75 | #define IOCNR_SET_PROTOCOL 3 | |
76 | #define IOCNR_HP_SET_CHANNEL 4 | |
77 | #define IOCNR_GET_BUS_ADDRESS 5 | |
78 | #define IOCNR_GET_VID_PID 6 | |
79 | #define IOCNR_SOFT_RESET 7 | |
80 | /* Get device_id string: */ | |
81 | #define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len) | |
82 | /* The following ioctls were added for http://hpoj.sourceforge.net: */ | |
83 | /* Get two-int array: | |
84 | * [0]=current protocol (1=7/1/1, 2=7/1/2, 3=7/1/3), | |
85 | * [1]=supported protocol mask (mask&(1<<n)!=0 means 7/1/n supported): */ | |
86 | #define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len) | |
87 | /* Set protocol (arg: 1=7/1/1, 2=7/1/2, 3=7/1/3): */ | |
88 | #define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0) | |
89 | /* Set channel number (HP Vendor-specific command): */ | |
90 | #define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0) | |
91 | /* Get two-int array: [0]=bus number, [1]=device address: */ | |
92 | #define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len) | |
93 | /* Get two-int array: [0]=vendor ID, [1]=product ID: */ | |
94 | #define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len) | |
95 | /* Perform class specific soft reset */ | |
96 | #define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0); | |
97 | ||
98 | /* | |
99 | * A DEVICE_ID string may include the printer's serial number. | |
100 | * It should end with a semi-colon (';'). | |
101 | * An example from an HP 970C DeskJet printer is (this is one long string, | |
102 | * with the serial number changed): | |
103 | 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: ; | |
104 | */ | |
105 | ||
106 | /* | |
107 | * USB Printer Requests | |
108 | */ | |
109 | ||
110 | #define USBLP_REQ_GET_ID 0x00 | |
111 | #define USBLP_REQ_GET_STATUS 0x01 | |
112 | #define USBLP_REQ_RESET 0x02 | |
113 | #define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST 0x00 /* HP Vendor-specific */ | |
114 | ||
115 | #define USBLP_MINORS 16 | |
116 | #define USBLP_MINOR_BASE 0 | |
117 | ||
283face8 | 118 | #define USBLP_CTL_TIMEOUT 5000 /* 5 seconds */ |
1da177e4 LT |
119 | |
120 | #define USBLP_FIRST_PROTOCOL 1 | |
121 | #define USBLP_LAST_PROTOCOL 3 | |
122 | #define USBLP_MAX_PROTOCOLS (USBLP_LAST_PROTOCOL+1) | |
123 | ||
124 | /* | |
125 | * some arbitrary status buffer size; | |
126 | * need a status buffer that is allocated via kmalloc(), not on stack | |
127 | */ | |
128 | #define STATUS_BUF_SIZE 8 | |
129 | ||
317c67b8 PZ |
130 | /* |
131 | * Locks down the locking order: | |
132 | * ->wmut locks wstatus. | |
133 | * ->mut locks the whole usblp, except [rw]complete, and thus, by indirection, | |
134 | * [rw]status. We only touch status when we know the side idle. | |
135 | * ->lock locks what interrupt accesses. | |
136 | */ | |
1da177e4 | 137 | struct usblp { |
916de027 | 138 | struct usb_device *dev; /* USB device */ |
317c67b8 PZ |
139 | struct mutex wmut; |
140 | struct mutex mut; | |
141 | spinlock_t lock; /* locks rcomplete, wcomplete */ | |
1da177e4 LT |
142 | char *readbuf; /* read transfer_buffer */ |
143 | char *statusbuf; /* status transfer_buffer */ | |
317c67b8 PZ |
144 | struct usb_anchor urbs; |
145 | wait_queue_head_t rwait, wwait; | |
1da177e4 LT |
146 | int readcount; /* Counter for reads */ |
147 | int ifnum; /* Interface number */ | |
148 | struct usb_interface *intf; /* The interface */ | |
149 | /* Alternate-setting numbers and endpoints for each protocol | |
150 | * (7/1/{index=1,2,3}) that the device supports: */ | |
151 | struct { | |
152 | int alt_setting; | |
153 | struct usb_endpoint_descriptor *epwrite; | |
154 | struct usb_endpoint_descriptor *epread; | |
155 | } protocol[USBLP_MAX_PROTOCOLS]; | |
156 | int current_protocol; | |
157 | int minor; /* minor number of device */ | |
317c67b8 PZ |
158 | int wcomplete, rcomplete; |
159 | int wstatus; /* bytes written or error */ | |
160 | int rstatus; /* bytes ready or error */ | |
1da177e4 | 161 | unsigned int quirks; /* quirks flags */ |
7f477358 | 162 | unsigned int flags; /* mode flags */ |
1da177e4 LT |
163 | unsigned char used; /* True if open */ |
164 | unsigned char present; /* True if not disconnected */ | |
165 | unsigned char bidir; /* interface is bidirectional */ | |
7f477358 | 166 | unsigned char no_paper; /* Paper Out happened */ |
1da177e4 LT |
167 | unsigned char *device_id_string; /* IEEE 1284 DEVICE ID string (ptr) */ |
168 | /* first 2 bytes are (big-endian) length */ | |
169 | }; | |
170 | ||
171 | #ifdef DEBUG | |
916de027 NK |
172 | static void usblp_dump(struct usblp *usblp) |
173 | { | |
1da177e4 LT |
174 | int p; |
175 | ||
176 | dbg("usblp=0x%p", usblp); | |
177 | dbg("dev=0x%p", usblp->dev); | |
178 | dbg("present=%d", usblp->present); | |
179 | dbg("readbuf=0x%p", usblp->readbuf); | |
1da177e4 LT |
180 | dbg("readcount=%d", usblp->readcount); |
181 | dbg("ifnum=%d", usblp->ifnum); | |
182 | for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) { | |
183 | dbg("protocol[%d].alt_setting=%d", p, usblp->protocol[p].alt_setting); | |
184 | dbg("protocol[%d].epwrite=%p", p, usblp->protocol[p].epwrite); | |
185 | dbg("protocol[%d].epread=%p", p, usblp->protocol[p].epread); | |
186 | } | |
187 | dbg("current_protocol=%d", usblp->current_protocol); | |
188 | dbg("minor=%d", usblp->minor); | |
317c67b8 PZ |
189 | dbg("wstatus=%d", usblp->wstatus); |
190 | dbg("rstatus=%d", usblp->rstatus); | |
1da177e4 LT |
191 | dbg("quirks=%d", usblp->quirks); |
192 | dbg("used=%d", usblp->used); | |
193 | dbg("bidir=%d", usblp->bidir); | |
194 | dbg("device_id_string=\"%s\"", | |
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 */ | |
5ec71db5 | 211 | #define USBLP_QUIRK_BAD_CLASS 0x4 /* descriptor uses vendor-specific Class or SubClass */ |
1da177e4 | 212 | |
4c4c9432 | 213 | static const struct quirk_printer_struct quirk_printers[] = { |
1da177e4 LT |
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 */ | |
916de027 NK |
220 | { 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */ |
221 | { 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */ | |
1da177e4 LT |
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) */ | |
4f45d038 | 227 | { 0x0482, 0x0010, USBLP_QUIRK_BIDIR }, /* Kyocera Mita FS 820, by zut <kernel@zut.de> */ |
06a743bf | 228 | { 0x04f9, 0x000d, USBLP_QUIRK_BIDIR }, /* Brother Industries, Ltd HL-1440 Laser Printer */ |
5ec71db5 | 229 | { 0x04b8, 0x0202, USBLP_QUIRK_BAD_CLASS }, /* Seiko Epson Receipt Printer M129C */ |
1da177e4 LT |
230 | { 0, 0 } |
231 | }; | |
232 | ||
317c67b8 PZ |
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); | |
1da177e4 LT |
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; | |
4186ecf8 | 244 | static DEFINE_MUTEX(usblp_mutex); /* locks the existence of usblp's */ |
1da177e4 LT |
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 | */ | |
916de027 NK |
258 | if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) |
259 | index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting; | |
1da177e4 LT |
260 | |
261 | retval = usb_control_msg(usblp->dev, | |
262 | dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0), | |
283face8 | 263 | request, type | dir | recip, value, index, buf, len, USBLP_CTL_TIMEOUT); |
1da177e4 LT |
264 | dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d", |
265 | request, !!dir, recip, value, index, len, retval); | |
266 | return retval < 0 ? retval : 0; | |
267 | } | |
268 | ||
269 | #define usblp_read_status(usblp, status)\ | |
270 | usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1) | |
271 | #define usblp_get_id(usblp, config, id, maxlen)\ | |
272 | usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen) | |
273 | #define usblp_reset(usblp)\ | |
274 | usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0) | |
275 | ||
276 | #define usblp_hp_channel_change_request(usblp, channel, buffer) \ | |
277 | usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1) | |
278 | ||
279 | /* | |
280 | * See the description for usblp_select_alts() below for the usage | |
281 | * explanation. Look into your /proc/bus/usb/devices and dmesg in | |
282 | * case of any trouble. | |
283 | */ | |
284 | static int proto_bias = -1; | |
285 | ||
286 | /* | |
287 | * URB callback. | |
288 | */ | |
289 | ||
7d12e780 | 290 | static void usblp_bulk_read(struct urb *urb) |
1da177e4 LT |
291 | { |
292 | struct usblp *usblp = urb->context; | |
18ac3016 | 293 | int status = urb->status; |
1da177e4 | 294 | |
317c67b8 | 295 | if (usblp->present && usblp->used) { |
18ac3016 | 296 | if (status) |
317c67b8 PZ |
297 | printk(KERN_WARNING "usblp%d: " |
298 | "nonzero read bulk status received: %d\n", | |
18ac3016 | 299 | usblp->minor, status); |
317c67b8 PZ |
300 | } |
301 | spin_lock(&usblp->lock); | |
18ac3016 GKH |
302 | if (status < 0) |
303 | usblp->rstatus = status; | |
317c67b8 PZ |
304 | else |
305 | usblp->rstatus = urb->actual_length; | |
1da177e4 | 306 | usblp->rcomplete = 1; |
317c67b8 PZ |
307 | wake_up(&usblp->rwait); |
308 | spin_unlock(&usblp->lock); | |
309 | ||
310 | usb_free_urb(urb); | |
1da177e4 LT |
311 | } |
312 | ||
7d12e780 | 313 | static void usblp_bulk_write(struct urb *urb) |
1da177e4 LT |
314 | { |
315 | struct usblp *usblp = urb->context; | |
18ac3016 | 316 | int status = urb->status; |
1da177e4 | 317 | |
317c67b8 | 318 | if (usblp->present && usblp->used) { |
18ac3016 | 319 | if (status) |
317c67b8 PZ |
320 | printk(KERN_WARNING "usblp%d: " |
321 | "nonzero write bulk status received: %d\n", | |
18ac3016 | 322 | usblp->minor, status); |
317c67b8 PZ |
323 | } |
324 | spin_lock(&usblp->lock); | |
18ac3016 GKH |
325 | if (status < 0) |
326 | usblp->wstatus = status; | |
317c67b8 PZ |
327 | else |
328 | usblp->wstatus = urb->actual_length; | |
7f477358 | 329 | usblp->no_paper = 0; |
1da177e4 | 330 | usblp->wcomplete = 1; |
317c67b8 PZ |
331 | wake_up(&usblp->wwait); |
332 | spin_unlock(&usblp->lock); | |
333 | ||
317c67b8 | 334 | usb_free_urb(urb); |
1da177e4 LT |
335 | } |
336 | ||
337 | /* | |
338 | * Get and print printer errors. | |
339 | */ | |
340 | ||
4c4c9432 | 341 | static const char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" }; |
1da177e4 LT |
342 | |
343 | static int usblp_check_status(struct usblp *usblp, int err) | |
344 | { | |
345 | unsigned char status, newerr = 0; | |
346 | int error; | |
347 | ||
fc401e69 PZ |
348 | mutex_lock(&usblp->mut); |
349 | if ((error = usblp_read_status(usblp, usblp->statusbuf)) < 0) { | |
350 | mutex_unlock(&usblp->mut); | |
0bc8e009 | 351 | if (printk_ratelimit()) |
317c67b8 PZ |
352 | printk(KERN_ERR |
353 | "usblp%d: error %d reading printer status\n", | |
0bc8e009 | 354 | usblp->minor, error); |
1da177e4 LT |
355 | return 0; |
356 | } | |
1da177e4 | 357 | status = *usblp->statusbuf; |
fc401e69 | 358 | mutex_unlock(&usblp->mut); |
1da177e4 LT |
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 | ||
317c67b8 PZ |
367 | if (newerr != err) { |
368 | printk(KERN_INFO "usblp%d: %s\n", | |
369 | usblp->minor, usblp_messages[newerr]); | |
370 | } | |
1da177e4 LT |
371 | |
372 | return newerr; | |
373 | } | |
374 | ||
916de027 | 375 | static int handle_bidir(struct usblp *usblp) |
516077c1 | 376 | { |
3a90f818 | 377 | if (usblp->bidir && usblp->used) { |
317c67b8 | 378 | if (usblp_submit_read(usblp) < 0) |
516077c1 | 379 | return -EIO; |
516077c1 | 380 | } |
516077c1 ON |
381 | return 0; |
382 | } | |
383 | ||
1da177e4 LT |
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 | ||
916de027 | 398 | mutex_lock(&usblp_mutex); |
1da177e4 LT |
399 | |
400 | retval = -ENODEV; | |
401 | intf = usb_find_interface(&usblp_driver, minor); | |
916de027 | 402 | if (!intf) |
1da177e4 | 403 | goto out; |
916de027 | 404 | usblp = usb_get_intfdata(intf); |
1da177e4 LT |
405 | if (!usblp || !usblp->dev || !usblp->present) |
406 | goto out; | |
407 | ||
408 | retval = -EBUSY; | |
409 | if (usblp->used) | |
410 | goto out; | |
411 | ||
412 | /* | |
7f477358 PZ |
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 | |
1da177e4 | 416 | */ |
1da177e4 | 417 | |
d0532184 ON |
418 | retval = usb_autopm_get_interface(intf); |
419 | if (retval < 0) | |
420 | goto out; | |
1da177e4 LT |
421 | usblp->used = 1; |
422 | file->private_data = usblp; | |
423 | ||
1da177e4 | 424 | usblp->wcomplete = 1; /* we begin writeable */ |
317c67b8 | 425 | usblp->wstatus = 0; |
1da177e4 LT |
426 | usblp->rcomplete = 0; |
427 | ||
516077c1 | 428 | if (handle_bidir(usblp) < 0) { |
19028690 | 429 | usb_autopm_put_interface(intf); |
97cb95d1 | 430 | usblp->used = 0; |
516077c1 ON |
431 | file->private_data = NULL; |
432 | retval = -EIO; | |
1da177e4 LT |
433 | } |
434 | out: | |
916de027 | 435 | mutex_unlock(&usblp_mutex); |
1da177e4 LT |
436 | return retval; |
437 | } | |
438 | ||
916de027 | 439 | static void usblp_cleanup(struct usblp *usblp) |
1da177e4 | 440 | { |
317c67b8 | 441 | printk(KERN_INFO "usblp%d: removed\n", usblp->minor); |
1da177e4 | 442 | |
317c67b8 | 443 | kfree(usblp->readbuf); |
916de027 NK |
444 | kfree(usblp->device_id_string); |
445 | kfree(usblp->statusbuf); | |
446 | kfree(usblp); | |
1da177e4 LT |
447 | } |
448 | ||
449 | static void usblp_unlink_urbs(struct usblp *usblp) | |
450 | { | |
317c67b8 | 451 | usb_kill_anchored_urbs(&usblp->urbs); |
1da177e4 LT |
452 | } |
453 | ||
454 | static int usblp_release(struct inode *inode, struct file *file) | |
455 | { | |
456 | struct usblp *usblp = file->private_data; | |
457 | ||
7f477358 PZ |
458 | usblp->flags &= ~LP_ABORT; |
459 | ||
916de027 | 460 | mutex_lock(&usblp_mutex); |
1da177e4 LT |
461 | usblp->used = 0; |
462 | if (usblp->present) { | |
463 | usblp_unlink_urbs(usblp); | |
d0532184 | 464 | usb_autopm_put_interface(usblp->intf); |
916de027 NK |
465 | } else /* finish cleanup from disconnect */ |
466 | usblp_cleanup(usblp); | |
467 | mutex_unlock(&usblp_mutex); | |
1da177e4 LT |
468 | return 0; |
469 | } | |
470 | ||
471 | /* No kernel lock - fine */ | |
472 | static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait) | |
473 | { | |
317c67b8 PZ |
474 | int ret; |
475 | unsigned long flags; | |
476 | ||
1da177e4 | 477 | struct usblp *usblp = file->private_data; |
317c67b8 PZ |
478 | /* Should we check file->f_mode & FMODE_WRITE before poll_wait()? */ |
479 | poll_wait(file, &usblp->rwait, wait); | |
480 | poll_wait(file, &usblp->wwait, wait); | |
481 | spin_lock_irqsave(&usblp->lock, flags); | |
283face8 PZ |
482 | ret = ((usblp->bidir && usblp->rcomplete) ? POLLIN | POLLRDNORM : 0) | |
483 | ((usblp->no_paper || usblp->wcomplete) ? POLLOUT | POLLWRNORM : 0); | |
317c67b8 PZ |
484 | spin_unlock_irqrestore(&usblp->lock, flags); |
485 | return ret; | |
1da177e4 LT |
486 | } |
487 | ||
318e479e | 488 | static long usblp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
489 | { |
490 | struct usblp *usblp = file->private_data; | |
491 | int length, err, i; | |
492 | unsigned char newChannel; | |
493 | int status; | |
494 | int twoints[2]; | |
495 | int retval = 0; | |
496 | ||
916de027 | 497 | mutex_lock(&usblp->mut); |
1da177e4 LT |
498 | if (!usblp->present) { |
499 | retval = -ENODEV; | |
500 | goto done; | |
501 | } | |
502 | ||
503 | dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd), | |
916de027 | 504 | _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd)); |
1da177e4 LT |
505 | |
506 | if (_IOC_TYPE(cmd) == 'P') /* new-style ioctl number */ | |
507 | ||
508 | switch (_IOC_NR(cmd)) { | |
509 | ||
916de027 NK |
510 | case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */ |
511 | if (_IOC_DIR(cmd) != _IOC_READ) { | |
512 | retval = -EINVAL; | |
513 | goto done; | |
514 | } | |
1da177e4 | 515 | |
916de027 NK |
516 | length = usblp_cache_device_id_string(usblp); |
517 | if (length < 0) { | |
518 | retval = length; | |
519 | goto done; | |
520 | } | |
521 | if (length > _IOC_SIZE(cmd)) | |
522 | length = _IOC_SIZE(cmd); /* truncate */ | |
523 | ||
524 | if (copy_to_user((void __user *) arg, | |
525 | usblp->device_id_string, | |
526 | (unsigned long) length)) { | |
527 | retval = -EFAULT; | |
528 | goto done; | |
529 | } | |
1da177e4 | 530 | |
916de027 | 531 | break; |
1da177e4 | 532 | |
916de027 NK |
533 | case IOCNR_GET_PROTOCOLS: |
534 | if (_IOC_DIR(cmd) != _IOC_READ || | |
535 | _IOC_SIZE(cmd) < sizeof(twoints)) { | |
536 | retval = -EINVAL; | |
537 | goto done; | |
538 | } | |
1da177e4 | 539 | |
916de027 NK |
540 | twoints[0] = usblp->current_protocol; |
541 | twoints[1] = 0; | |
542 | for (i = USBLP_FIRST_PROTOCOL; | |
543 | i <= USBLP_LAST_PROTOCOL; i++) { | |
544 | if (usblp->protocol[i].alt_setting >= 0) | |
545 | twoints[1] |= (1<<i); | |
546 | } | |
1da177e4 | 547 | |
916de027 NK |
548 | if (copy_to_user((void __user *)arg, |
549 | (unsigned char *)twoints, | |
550 | sizeof(twoints))) { | |
551 | retval = -EFAULT; | |
552 | goto done; | |
553 | } | |
1da177e4 | 554 | |
916de027 | 555 | break; |
1da177e4 | 556 | |
916de027 NK |
557 | case IOCNR_SET_PROTOCOL: |
558 | if (_IOC_DIR(cmd) != _IOC_WRITE) { | |
559 | retval = -EINVAL; | |
560 | goto done; | |
561 | } | |
1da177e4 LT |
562 | |
563 | #ifdef DEBUG | |
916de027 NK |
564 | if (arg == -10) { |
565 | usblp_dump(usblp); | |
566 | break; | |
567 | } | |
1da177e4 LT |
568 | #endif |
569 | ||
916de027 NK |
570 | usblp_unlink_urbs(usblp); |
571 | retval = usblp_set_protocol(usblp, arg); | |
572 | if (retval < 0) { | |
573 | usblp_set_protocol(usblp, | |
574 | usblp->current_protocol); | |
575 | } | |
576 | break; | |
1da177e4 | 577 | |
916de027 NK |
578 | case IOCNR_HP_SET_CHANNEL: |
579 | if (_IOC_DIR(cmd) != _IOC_WRITE || | |
580 | le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 || | |
581 | usblp->quirks & USBLP_QUIRK_BIDIR) { | |
582 | retval = -EINVAL; | |
583 | goto done; | |
584 | } | |
1da177e4 | 585 | |
916de027 NK |
586 | err = usblp_hp_channel_change_request(usblp, |
587 | arg, &newChannel); | |
588 | if (err < 0) { | |
589 | dev_err(&usblp->dev->dev, | |
590 | "usblp%d: error = %d setting " | |
591 | "HP channel\n", | |
592 | usblp->minor, err); | |
593 | retval = -EIO; | |
594 | goto done; | |
595 | } | |
1da177e4 | 596 | |
916de027 NK |
597 | dbg("usblp%d requested/got HP channel %ld/%d", |
598 | usblp->minor, arg, newChannel); | |
599 | break; | |
1da177e4 | 600 | |
916de027 NK |
601 | case IOCNR_GET_BUS_ADDRESS: |
602 | if (_IOC_DIR(cmd) != _IOC_READ || | |
603 | _IOC_SIZE(cmd) < sizeof(twoints)) { | |
604 | retval = -EINVAL; | |
605 | goto done; | |
606 | } | |
1da177e4 | 607 | |
916de027 NK |
608 | twoints[0] = usblp->dev->bus->busnum; |
609 | twoints[1] = usblp->dev->devnum; | |
610 | if (copy_to_user((void __user *)arg, | |
611 | (unsigned char *)twoints, | |
612 | sizeof(twoints))) { | |
613 | retval = -EFAULT; | |
614 | goto done; | |
615 | } | |
1da177e4 | 616 | |
916de027 NK |
617 | dbg("usblp%d is bus=%d, device=%d", |
618 | usblp->minor, twoints[0], twoints[1]); | |
619 | break; | |
1da177e4 | 620 | |
916de027 NK |
621 | case IOCNR_GET_VID_PID: |
622 | if (_IOC_DIR(cmd) != _IOC_READ || | |
623 | _IOC_SIZE(cmd) < sizeof(twoints)) { | |
624 | retval = -EINVAL; | |
625 | goto done; | |
626 | } | |
1da177e4 | 627 | |
916de027 NK |
628 | twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor); |
629 | twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct); | |
630 | if (copy_to_user((void __user *)arg, | |
631 | (unsigned char *)twoints, | |
632 | sizeof(twoints))) { | |
633 | retval = -EFAULT; | |
634 | goto done; | |
635 | } | |
1da177e4 | 636 | |
916de027 NK |
637 | dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X", |
638 | usblp->minor, twoints[0], twoints[1]); | |
639 | break; | |
1da177e4 | 640 | |
916de027 NK |
641 | case IOCNR_SOFT_RESET: |
642 | if (_IOC_DIR(cmd) != _IOC_NONE) { | |
643 | retval = -EINVAL; | |
644 | goto done; | |
645 | } | |
646 | retval = usblp_reset(usblp); | |
647 | break; | |
648 | default: | |
649 | retval = -ENOTTY; | |
1da177e4 LT |
650 | } |
651 | else /* old-style ioctl value */ | |
652 | switch (cmd) { | |
653 | ||
916de027 NK |
654 | case LPGETSTATUS: |
655 | if ((retval = usblp_read_status(usblp, usblp->statusbuf))) { | |
656 | if (printk_ratelimit()) | |
657 | printk(KERN_ERR "usblp%d:" | |
658 | "failed reading printer status (%d)\n", | |
659 | usblp->minor, retval); | |
660 | retval = -EIO; | |
661 | goto done; | |
662 | } | |
663 | status = *usblp->statusbuf; | |
664 | if (copy_to_user((void __user *)arg, &status, sizeof(int))) | |
665 | retval = -EFAULT; | |
666 | break; | |
1da177e4 | 667 | |
916de027 NK |
668 | case LPABORT: |
669 | if (arg) | |
670 | usblp->flags |= LP_ABORT; | |
671 | else | |
672 | usblp->flags &= ~LP_ABORT; | |
673 | break; | |
7f477358 | 674 | |
916de027 NK |
675 | default: |
676 | retval = -ENOTTY; | |
1da177e4 LT |
677 | } |
678 | ||
679 | done: | |
916de027 | 680 | mutex_unlock(&usblp->mut); |
1da177e4 LT |
681 | return retval; |
682 | } | |
683 | ||
42cb967f PZ |
684 | static struct urb *usblp_new_writeurb(struct usblp *usblp, int transfer_length) |
685 | { | |
686 | struct urb *urb; | |
687 | char *writebuf; | |
688 | ||
689 | if ((writebuf = kmalloc(transfer_length, GFP_KERNEL)) == NULL) | |
690 | return NULL; | |
691 | if ((urb = usb_alloc_urb(0, GFP_KERNEL)) == NULL) { | |
692 | kfree(writebuf); | |
693 | return NULL; | |
694 | } | |
695 | ||
696 | usb_fill_bulk_urb(urb, usblp->dev, | |
697 | usb_sndbulkpipe(usblp->dev, | |
698 | usblp->protocol[usblp->current_protocol].epwrite->bEndpointAddress), | |
699 | writebuf, transfer_length, usblp_bulk_write, usblp); | |
700 | urb->transfer_flags |= URB_FREE_BUFFER; | |
701 | ||
702 | return urb; | |
703 | } | |
704 | ||
1da177e4 LT |
705 | static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) |
706 | { | |
1da177e4 | 707 | struct usblp *usblp = file->private_data; |
317c67b8 PZ |
708 | struct urb *writeurb; |
709 | int rv; | |
710 | int transfer_length; | |
711 | ssize_t writecount = 0; | |
712 | ||
713 | if (mutex_lock_interruptible(&usblp->wmut)) { | |
714 | rv = -EINTR; | |
715 | goto raise_biglock; | |
716 | } | |
717 | if ((rv = usblp_wwait(usblp, !!(file->f_flags & O_NONBLOCK))) < 0) | |
718 | goto raise_wait; | |
1da177e4 LT |
719 | |
720 | while (writecount < count) { | |
317c67b8 PZ |
721 | /* |
722 | * Step 1: Submit next block. | |
1da177e4 | 723 | */ |
317c67b8 | 724 | if ((transfer_length = count - writecount) > USBLP_BUF_SIZE) |
1da177e4 LT |
725 | transfer_length = USBLP_BUF_SIZE; |
726 | ||
317c67b8 | 727 | rv = -ENOMEM; |
42cb967f | 728 | if ((writeurb = usblp_new_writeurb(usblp, transfer_length)) == NULL) |
317c67b8 | 729 | goto raise_urb; |
317c67b8 PZ |
730 | usb_anchor_urb(writeurb, &usblp->urbs); |
731 | ||
42cb967f | 732 | if (copy_from_user(writeurb->transfer_buffer, |
1da177e4 | 733 | buffer + writecount, transfer_length)) { |
317c67b8 PZ |
734 | rv = -EFAULT; |
735 | goto raise_badaddr; | |
1da177e4 LT |
736 | } |
737 | ||
317c67b8 | 738 | spin_lock_irq(&usblp->lock); |
1da177e4 | 739 | usblp->wcomplete = 0; |
317c67b8 PZ |
740 | spin_unlock_irq(&usblp->lock); |
741 | if ((rv = usb_submit_urb(writeurb, GFP_KERNEL)) < 0) { | |
742 | usblp->wstatus = 0; | |
743 | spin_lock_irq(&usblp->lock); | |
7f477358 | 744 | usblp->no_paper = 0; |
6c8df79f | 745 | usblp->wcomplete = 1; |
317c67b8 PZ |
746 | wake_up(&usblp->wwait); |
747 | spin_unlock_irq(&usblp->lock); | |
748 | if (rv != -ENOMEM) | |
749 | rv = -EIO; | |
750 | goto raise_submit; | |
751 | } | |
752 | ||
753 | /* | |
754 | * Step 2: Wait for transfer to end, collect results. | |
755 | */ | |
756 | rv = usblp_wwait(usblp, !!(file->f_flags&O_NONBLOCK)); | |
757 | if (rv < 0) { | |
10e48522 PZ |
758 | if (rv == -EAGAIN) { |
759 | /* Presume that it's going to complete well. */ | |
760 | writecount += transfer_length; | |
761 | } | |
7f477358 PZ |
762 | if (rv == -ENOSPC) { |
763 | spin_lock_irq(&usblp->lock); | |
764 | usblp->no_paper = 1; /* Mark for poll(2) */ | |
765 | spin_unlock_irq(&usblp->lock); | |
766 | writecount += transfer_length; | |
767 | } | |
10e48522 | 768 | /* Leave URB dangling, to be cleaned on close. */ |
317c67b8 | 769 | goto collect_error; |
1da177e4 | 770 | } |
317c67b8 PZ |
771 | |
772 | if (usblp->wstatus < 0) { | |
317c67b8 PZ |
773 | rv = -EIO; |
774 | goto collect_error; | |
775 | } | |
776 | /* | |
777 | * This is critical: it must be our URB, not other writer's. | |
778 | * The wmut exists mainly to cover us here. | |
779 | */ | |
780 | writecount += usblp->wstatus; | |
1da177e4 LT |
781 | } |
782 | ||
317c67b8 PZ |
783 | mutex_unlock(&usblp->wmut); |
784 | return writecount; | |
785 | ||
786 | raise_submit: | |
787 | raise_badaddr: | |
788 | usb_unanchor_urb(writeurb); | |
789 | usb_free_urb(writeurb); | |
790 | raise_urb: | |
317c67b8 PZ |
791 | raise_wait: |
792 | collect_error: /* Out of raise sequence */ | |
793 | mutex_unlock(&usblp->wmut); | |
794 | raise_biglock: | |
795 | return writecount ? writecount : rv; | |
1da177e4 LT |
796 | } |
797 | ||
317c67b8 PZ |
798 | /* |
799 | * Notice that we fail to restart in a few cases: on EFAULT, on restart | |
800 | * error, etc. This is the historical behaviour. In all such cases we return | |
801 | * EIO, and applications loop in order to get the new read going. | |
802 | */ | |
803 | static ssize_t usblp_read(struct file *file, char __user *buffer, size_t len, loff_t *ppos) | |
1da177e4 LT |
804 | { |
805 | struct usblp *usblp = file->private_data; | |
317c67b8 PZ |
806 | ssize_t count; |
807 | ssize_t avail; | |
808 | int rv; | |
1da177e4 LT |
809 | |
810 | if (!usblp->bidir) | |
811 | return -EINVAL; | |
812 | ||
317c67b8 PZ |
813 | rv = usblp_rwait_and_lock(usblp, !!(file->f_flags & O_NONBLOCK)); |
814 | if (rv < 0) | |
815 | return rv; | |
816 | ||
817 | if ((avail = usblp->rstatus) < 0) { | |
818 | printk(KERN_ERR "usblp%d: error %d reading from printer\n", | |
819 | usblp->minor, (int)avail); | |
820 | usblp_submit_read(usblp); | |
821 | count = -EIO; | |
1da177e4 LT |
822 | goto done; |
823 | } | |
824 | ||
317c67b8 PZ |
825 | count = len < avail - usblp->readcount ? len : avail - usblp->readcount; |
826 | if (count != 0 && | |
827 | copy_to_user(buffer, usblp->readbuf + usblp->readcount, count)) { | |
828 | count = -EFAULT; | |
829 | goto done; | |
830 | } | |
1da177e4 | 831 | |
317c67b8 PZ |
832 | if ((usblp->readcount += count) == avail) { |
833 | if (usblp_submit_read(usblp) < 0) { | |
834 | /* We don't want to leak USB return codes into errno. */ | |
835 | if (count == 0) | |
836 | count = -EIO; | |
8e695cdb | 837 | goto done; |
1da177e4 | 838 | } |
1da177e4 LT |
839 | } |
840 | ||
317c67b8 | 841 | done: |
916de027 | 842 | mutex_unlock(&usblp->mut); |
317c67b8 PZ |
843 | return count; |
844 | } | |
845 | ||
846 | /* | |
847 | * Wait for the write path to come idle. | |
848 | * This is called under the ->wmut, so the idle path stays idle. | |
849 | * | |
850 | * Our write path has a peculiar property: it does not buffer like a tty, | |
851 | * but waits for the write to succeed. This allows our ->release to bug out | |
852 | * without waiting for writes to drain. But it obviously does not work | |
853 | * when O_NONBLOCK is set. So, applications setting O_NONBLOCK must use | |
854 | * select(2) or poll(2) to wait for the buffer to drain before closing. | |
855 | * Alternatively, set blocking mode with fcntl and issue a zero-size write. | |
317c67b8 PZ |
856 | */ |
857 | static int usblp_wwait(struct usblp *usblp, int nonblock) | |
858 | { | |
859 | DECLARE_WAITQUEUE(waita, current); | |
860 | int rc; | |
7f477358 | 861 | int err = 0; |
317c67b8 PZ |
862 | |
863 | add_wait_queue(&usblp->wwait, &waita); | |
864 | for (;;) { | |
7f477358 | 865 | set_current_state(TASK_INTERRUPTIBLE); |
317c67b8 PZ |
866 | if (mutex_lock_interruptible(&usblp->mut)) { |
867 | rc = -EINTR; | |
868 | break; | |
869 | } | |
7f477358 | 870 | rc = usblp_wtest(usblp, nonblock); |
317c67b8 | 871 | mutex_unlock(&usblp->mut); |
7f477358 | 872 | if (rc <= 0) |
317c67b8 | 873 | break; |
7f477358 | 874 | |
dd44be6b PZ |
875 | if (schedule_timeout(msecs_to_jiffies(1500)) == 0) { |
876 | if (usblp->flags & LP_ABORT) { | |
7f477358 PZ |
877 | err = usblp_check_status(usblp, err); |
878 | if (err == 1) { /* Paper out */ | |
879 | rc = -ENOSPC; | |
880 | break; | |
881 | } | |
dd44be6b PZ |
882 | } else { |
883 | /* Prod the printer, Gentoo#251237. */ | |
884 | mutex_lock(&usblp->mut); | |
885 | usblp_read_status(usblp, usblp->statusbuf); | |
886 | mutex_unlock(&usblp->mut); | |
7f477358 | 887 | } |
7f477358 | 888 | } |
1da177e4 | 889 | } |
317c67b8 PZ |
890 | set_current_state(TASK_RUNNING); |
891 | remove_wait_queue(&usblp->wwait, &waita); | |
892 | return rc; | |
893 | } | |
1da177e4 | 894 | |
317c67b8 PZ |
895 | static int usblp_wtest(struct usblp *usblp, int nonblock) |
896 | { | |
897 | unsigned long flags; | |
898 | ||
899 | if (!usblp->present) | |
900 | return -ENODEV; | |
901 | if (signal_pending(current)) | |
902 | return -EINTR; | |
903 | spin_lock_irqsave(&usblp->lock, flags); | |
904 | if (usblp->wcomplete) { | |
905 | spin_unlock_irqrestore(&usblp->lock, flags); | |
906 | return 0; | |
516077c1 | 907 | } |
317c67b8 | 908 | spin_unlock_irqrestore(&usblp->lock, flags); |
317c67b8 PZ |
909 | if (nonblock) |
910 | return -EAGAIN; | |
911 | return 1; | |
912 | } | |
516077c1 | 913 | |
317c67b8 PZ |
914 | /* |
915 | * Wait for read bytes to become available. This probably should have been | |
916 | * called usblp_r_lock_and_wait(), because we lock first. But it's a traditional | |
917 | * name for functions which lock and return. | |
918 | * | |
919 | * We do not use wait_event_interruptible because it makes locking iffy. | |
920 | */ | |
921 | static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock) | |
922 | { | |
923 | DECLARE_WAITQUEUE(waita, current); | |
924 | int rc; | |
925 | ||
926 | add_wait_queue(&usblp->rwait, &waita); | |
927 | for (;;) { | |
928 | if (mutex_lock_interruptible(&usblp->mut)) { | |
929 | rc = -EINTR; | |
930 | break; | |
931 | } | |
932 | set_current_state(TASK_INTERRUPTIBLE); | |
933 | if ((rc = usblp_rtest(usblp, nonblock)) < 0) { | |
934 | mutex_unlock(&usblp->mut); | |
935 | break; | |
936 | } | |
937 | if (rc == 0) /* Keep it locked */ | |
938 | break; | |
939 | mutex_unlock(&usblp->mut); | |
940 | schedule(); | |
1da177e4 | 941 | } |
317c67b8 PZ |
942 | set_current_state(TASK_RUNNING); |
943 | remove_wait_queue(&usblp->rwait, &waita); | |
944 | return rc; | |
945 | } | |
1da177e4 | 946 | |
317c67b8 PZ |
947 | static int usblp_rtest(struct usblp *usblp, int nonblock) |
948 | { | |
949 | unsigned long flags; | |
1da177e4 | 950 | |
317c67b8 PZ |
951 | if (!usblp->present) |
952 | return -ENODEV; | |
953 | if (signal_pending(current)) | |
954 | return -EINTR; | |
955 | spin_lock_irqsave(&usblp->lock, flags); | |
956 | if (usblp->rcomplete) { | |
957 | spin_unlock_irqrestore(&usblp->lock, flags); | |
958 | return 0; | |
1da177e4 | 959 | } |
317c67b8 | 960 | spin_unlock_irqrestore(&usblp->lock, flags); |
317c67b8 PZ |
961 | if (nonblock) |
962 | return -EAGAIN; | |
963 | return 1; | |
964 | } | |
1da177e4 | 965 | |
317c67b8 PZ |
966 | /* |
967 | * Please check ->bidir and other such things outside for now. | |
968 | */ | |
969 | static int usblp_submit_read(struct usblp *usblp) | |
970 | { | |
971 | struct urb *urb; | |
972 | unsigned long flags; | |
973 | int rc; | |
974 | ||
975 | rc = -ENOMEM; | |
976 | if ((urb = usb_alloc_urb(0, GFP_KERNEL)) == NULL) | |
977 | goto raise_urb; | |
978 | ||
979 | usb_fill_bulk_urb(urb, usblp->dev, | |
980 | usb_rcvbulkpipe(usblp->dev, | |
981 | usblp->protocol[usblp->current_protocol].epread->bEndpointAddress), | |
982 | usblp->readbuf, USBLP_BUF_SIZE_IN, | |
983 | usblp_bulk_read, usblp); | |
984 | usb_anchor_urb(urb, &usblp->urbs); | |
985 | ||
986 | spin_lock_irqsave(&usblp->lock, flags); | |
987 | usblp->readcount = 0; /* XXX Why here? */ | |
988 | usblp->rcomplete = 0; | |
989 | spin_unlock_irqrestore(&usblp->lock, flags); | |
990 | if ((rc = usb_submit_urb(urb, GFP_KERNEL)) < 0) { | |
991 | dbg("error submitting urb (%d)", rc); | |
992 | spin_lock_irqsave(&usblp->lock, flags); | |
993 | usblp->rstatus = rc; | |
994 | usblp->rcomplete = 1; | |
995 | spin_unlock_irqrestore(&usblp->lock, flags); | |
996 | goto raise_submit; | |
1da177e4 LT |
997 | } |
998 | ||
317c67b8 PZ |
999 | return 0; |
1000 | ||
1001 | raise_submit: | |
1002 | usb_unanchor_urb(urb); | |
1003 | usb_free_urb(urb); | |
1004 | raise_urb: | |
1005 | return rc; | |
1da177e4 LT |
1006 | } |
1007 | ||
1008 | /* | |
1009 | * Checks for printers that have quirks, such as requiring unidirectional | |
1010 | * communication but reporting bidirectional; currently some HP printers | |
1011 | * have this flaw (HP 810, 880, 895, etc.), or needing an init string | |
1012 | * sent at each open (like some Epsons). | |
1013 | * Returns 1 if found, 0 if not found. | |
1014 | * | |
1015 | * HP recommended that we use the bidirectional interface but | |
1016 | * don't attempt any bulk IN transfers from the IN endpoint. | |
1017 | * Here's some more detail on the problem: | |
1018 | * The problem is not that it isn't bidirectional though. The problem | |
1019 | * is that if you request a device ID, or status information, while | |
1020 | * the buffers are full, the return data will end up in the print data | |
1021 | * buffer. For example if you make sure you never request the device ID | |
1022 | * while you are sending print data, and you don't try to query the | |
1023 | * printer status every couple of milliseconds, you will probably be OK. | |
1024 | */ | |
916de027 | 1025 | static unsigned int usblp_quirks(__u16 vendor, __u16 product) |
1da177e4 LT |
1026 | { |
1027 | int i; | |
1028 | ||
1029 | for (i = 0; quirk_printers[i].vendorId; i++) { | |
1030 | if (vendor == quirk_printers[i].vendorId && | |
1031 | product == quirk_printers[i].productId) | |
1032 | return quirk_printers[i].quirks; | |
916de027 | 1033 | } |
1da177e4 LT |
1034 | return 0; |
1035 | } | |
1036 | ||
066202dd | 1037 | static const struct file_operations usblp_fops = { |
1da177e4 LT |
1038 | .owner = THIS_MODULE, |
1039 | .read = usblp_read, | |
1040 | .write = usblp_write, | |
1041 | .poll = usblp_poll, | |
318e479e PZ |
1042 | .unlocked_ioctl = usblp_ioctl, |
1043 | .compat_ioctl = usblp_ioctl, | |
1da177e4 LT |
1044 | .open = usblp_open, |
1045 | .release = usblp_release, | |
6038f373 | 1046 | .llseek = noop_llseek, |
1da177e4 LT |
1047 | }; |
1048 | ||
e454cea2 | 1049 | static char *usblp_devnode(struct device *dev, mode_t *mode) |
f7a386c5 KS |
1050 | { |
1051 | return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); | |
1052 | } | |
1053 | ||
1da177e4 | 1054 | static struct usb_class_driver usblp_class = { |
d6e5bcf4 | 1055 | .name = "lp%d", |
e454cea2 | 1056 | .devnode = usblp_devnode, |
1da177e4 | 1057 | .fops = &usblp_fops, |
1da177e4 LT |
1058 | .minor_base = USBLP_MINOR_BASE, |
1059 | }; | |
1060 | ||
a9714c84 DW |
1061 | static ssize_t usblp_show_ieee1284_id(struct device *dev, struct device_attribute *attr, char *buf) |
1062 | { | |
1063 | struct usb_interface *intf = to_usb_interface(dev); | |
916de027 | 1064 | struct usblp *usblp = usb_get_intfdata(intf); |
a9714c84 DW |
1065 | |
1066 | if (usblp->device_id_string[0] == 0 && | |
1067 | usblp->device_id_string[1] == 0) | |
1068 | return 0; | |
1069 | ||
1070 | return sprintf(buf, "%s", usblp->device_id_string+2); | |
1071 | } | |
1072 | ||
1073 | static DEVICE_ATTR(ieee1284_id, S_IRUGO, usblp_show_ieee1284_id, NULL); | |
1074 | ||
1da177e4 LT |
1075 | static int usblp_probe(struct usb_interface *intf, |
1076 | const struct usb_device_id *id) | |
1077 | { | |
916de027 | 1078 | struct usb_device *dev = interface_to_usbdev(intf); |
49b707b9 | 1079 | struct usblp *usblp; |
1da177e4 LT |
1080 | int protocol; |
1081 | int retval; | |
1082 | ||
1083 | /* Malloc and start initializing usblp structure so we can use it | |
1084 | * directly. */ | |
49b707b9 JL |
1085 | usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL); |
1086 | if (!usblp) { | |
317c67b8 | 1087 | retval = -ENOMEM; |
49b707b9 | 1088 | goto abort_ret; |
1da177e4 | 1089 | } |
1da177e4 | 1090 | usblp->dev = dev; |
317c67b8 | 1091 | mutex_init(&usblp->wmut); |
916de027 | 1092 | mutex_init(&usblp->mut); |
317c67b8 PZ |
1093 | spin_lock_init(&usblp->lock); |
1094 | init_waitqueue_head(&usblp->rwait); | |
1095 | init_waitqueue_head(&usblp->wwait); | |
1096 | init_usb_anchor(&usblp->urbs); | |
1da177e4 LT |
1097 | usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; |
1098 | usblp->intf = intf; | |
1099 | ||
1da177e4 LT |
1100 | /* Malloc device ID string buffer to the largest expected length, |
1101 | * since we can re-query it on an ioctl and a dynamic string | |
1102 | * could change in length. */ | |
1103 | if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) { | |
317c67b8 | 1104 | retval = -ENOMEM; |
1da177e4 LT |
1105 | goto abort; |
1106 | } | |
1107 | ||
317c67b8 PZ |
1108 | /* |
1109 | * Allocate read buffer. We somewhat wastefully | |
1da177e4 | 1110 | * malloc both regardless of bidirectionality, because the |
317c67b8 PZ |
1111 | * alternate setting can be changed later via an ioctl. |
1112 | */ | |
1113 | if (!(usblp->readbuf = kmalloc(USBLP_BUF_SIZE_IN, GFP_KERNEL))) { | |
1114 | retval = -ENOMEM; | |
1da177e4 LT |
1115 | goto abort; |
1116 | } | |
1117 | ||
1118 | /* Allocate buffer for printer status */ | |
1119 | usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL); | |
1120 | if (!usblp->statusbuf) { | |
317c67b8 | 1121 | retval = -ENOMEM; |
1da177e4 LT |
1122 | goto abort; |
1123 | } | |
1124 | ||
1125 | /* Lookup quirks for this printer. */ | |
1126 | usblp->quirks = usblp_quirks( | |
1127 | le16_to_cpu(dev->descriptor.idVendor), | |
1128 | le16_to_cpu(dev->descriptor.idProduct)); | |
1129 | ||
1130 | /* Analyze and pick initial alternate settings and endpoints. */ | |
1131 | protocol = usblp_select_alts(usblp); | |
1132 | if (protocol < 0) { | |
1133 | dbg("incompatible printer-class device 0x%4.4X/0x%4.4X", | |
1134 | le16_to_cpu(dev->descriptor.idVendor), | |
1135 | le16_to_cpu(dev->descriptor.idProduct)); | |
317c67b8 | 1136 | retval = -ENODEV; |
1da177e4 LT |
1137 | goto abort; |
1138 | } | |
1139 | ||
1140 | /* Setup the selected alternate setting and endpoints. */ | |
317c67b8 PZ |
1141 | if (usblp_set_protocol(usblp, protocol) < 0) { |
1142 | retval = -ENODEV; /* ->probe isn't ->ioctl */ | |
1da177e4 | 1143 | goto abort; |
317c67b8 | 1144 | } |
1da177e4 LT |
1145 | |
1146 | /* Retrieve and store the device ID string. */ | |
1147 | usblp_cache_device_id_string(usblp); | |
96cede53 GKH |
1148 | retval = device_create_file(&intf->dev, &dev_attr_ieee1284_id); |
1149 | if (retval) | |
1150 | goto abort_intfdata; | |
1da177e4 LT |
1151 | |
1152 | #ifdef DEBUG | |
1153 | usblp_check_status(usblp, 0); | |
1154 | #endif | |
1155 | ||
916de027 | 1156 | usb_set_intfdata(intf, usblp); |
1da177e4 LT |
1157 | |
1158 | usblp->present = 1; | |
1159 | ||
1160 | retval = usb_register_dev(intf, &usblp_class); | |
1161 | if (retval) { | |
317c67b8 PZ |
1162 | printk(KERN_ERR "usblp: Not able to get a minor" |
1163 | " (base %u, slice default): %d\n", | |
1164 | USBLP_MINOR_BASE, retval); | |
1da177e4 LT |
1165 | goto abort_intfdata; |
1166 | } | |
1167 | usblp->minor = intf->minor; | |
317c67b8 PZ |
1168 | printk(KERN_INFO "usblp%d: USB %sdirectional printer dev %d " |
1169 | "if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X\n", | |
a9714c84 DW |
1170 | usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum, |
1171 | usblp->ifnum, | |
1172 | usblp->protocol[usblp->current_protocol].alt_setting, | |
1173 | usblp->current_protocol, | |
1174 | le16_to_cpu(usblp->dev->descriptor.idVendor), | |
1175 | le16_to_cpu(usblp->dev->descriptor.idProduct)); | |
1da177e4 LT |
1176 | |
1177 | return 0; | |
1178 | ||
1179 | abort_intfdata: | |
916de027 | 1180 | usb_set_intfdata(intf, NULL); |
a9714c84 | 1181 | device_remove_file(&intf->dev, &dev_attr_ieee1284_id); |
1da177e4 | 1182 | abort: |
49b707b9 JL |
1183 | kfree(usblp->readbuf); |
1184 | kfree(usblp->statusbuf); | |
1185 | kfree(usblp->device_id_string); | |
1186 | kfree(usblp); | |
1187 | abort_ret: | |
317c67b8 | 1188 | return retval; |
1da177e4 LT |
1189 | } |
1190 | ||
1191 | /* | |
1192 | * We are a "new" style driver with usb_device_id table, | |
1193 | * but our requirements are too intricate for simple match to handle. | |
1194 | * | |
1195 | * The "proto_bias" option may be used to specify the preferred protocol | |
1196 | * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3). If the device | |
1197 | * supports the preferred protocol, then we bind to it. | |
1198 | * | |
1199 | * The best interface for us is 7/1/2, because it is compatible | |
1200 | * with a stream of characters. If we find it, we bind to it. | |
1201 | * | |
1202 | * Note that the people from hpoj.sourceforge.net need to be able to | |
1203 | * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose. | |
1204 | * | |
1205 | * Failing 7/1/2, we look for 7/1/3, even though it's probably not | |
1206 | * stream-compatible, because this matches the behaviour of the old code. | |
1207 | * | |
1208 | * If nothing else, we bind to 7/1/1 - the unidirectional interface. | |
1209 | */ | |
1210 | static int usblp_select_alts(struct usblp *usblp) | |
1211 | { | |
1212 | struct usb_interface *if_alt; | |
1213 | struct usb_host_interface *ifd; | |
1214 | struct usb_endpoint_descriptor *epd, *epwrite, *epread; | |
1215 | int p, i, e; | |
1216 | ||
1217 | if_alt = usblp->intf; | |
1218 | ||
1219 | for (p = 0; p < USBLP_MAX_PROTOCOLS; p++) | |
1220 | usblp->protocol[p].alt_setting = -1; | |
1221 | ||
1222 | /* Find out what we have. */ | |
1223 | for (i = 0; i < if_alt->num_altsetting; i++) { | |
1224 | ifd = &if_alt->altsetting[i]; | |
1225 | ||
1226 | if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1) | |
5ec71db5 AS |
1227 | if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS)) |
1228 | continue; | |
1da177e4 LT |
1229 | |
1230 | if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL || | |
1231 | ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL) | |
1232 | continue; | |
1233 | ||
1234 | /* Look for bulk OUT and IN endpoints. */ | |
1235 | epwrite = epread = NULL; | |
1236 | for (e = 0; e < ifd->desc.bNumEndpoints; e++) { | |
1237 | epd = &ifd->endpoint[e].desc; | |
1238 | ||
5bc66d53 | 1239 | if (usb_endpoint_is_bulk_out(epd)) |
1da177e4 LT |
1240 | if (!epwrite) |
1241 | epwrite = epd; | |
1242 | ||
5bc66d53 | 1243 | if (usb_endpoint_is_bulk_in(epd)) |
1da177e4 LT |
1244 | if (!epread) |
1245 | epread = epd; | |
1da177e4 LT |
1246 | } |
1247 | ||
1248 | /* Ignore buggy hardware without the right endpoints. */ | |
1249 | if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread)) | |
1250 | continue; | |
1251 | ||
1252 | /* Turn off reads for 7/1/1 (unidirectional) interfaces | |
1253 | * and buggy bidirectional printers. */ | |
1254 | if (ifd->desc.bInterfaceProtocol == 1) { | |
1255 | epread = NULL; | |
1256 | } else if (usblp->quirks & USBLP_QUIRK_BIDIR) { | |
317c67b8 PZ |
1257 | printk(KERN_INFO "usblp%d: Disabling reads from " |
1258 | "problematic bidirectional printer\n", | |
1259 | usblp->minor); | |
1da177e4 LT |
1260 | epread = NULL; |
1261 | } | |
1262 | ||
1263 | usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting = | |
1264 | ifd->desc.bAlternateSetting; | |
1265 | usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite; | |
1266 | usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread; | |
1267 | } | |
1268 | ||
1269 | /* If our requested protocol is supported, then use it. */ | |
1270 | if (proto_bias >= USBLP_FIRST_PROTOCOL && | |
1271 | proto_bias <= USBLP_LAST_PROTOCOL && | |
1272 | usblp->protocol[proto_bias].alt_setting != -1) | |
1273 | return proto_bias; | |
1274 | ||
1275 | /* Ordering is important here. */ | |
1276 | if (usblp->protocol[2].alt_setting != -1) | |
1277 | return 2; | |
1278 | if (usblp->protocol[1].alt_setting != -1) | |
1279 | return 1; | |
1280 | if (usblp->protocol[3].alt_setting != -1) | |
1281 | return 3; | |
1282 | ||
1283 | /* If nothing is available, then don't bind to this device. */ | |
1284 | return -1; | |
1285 | } | |
1286 | ||
1287 | static int usblp_set_protocol(struct usblp *usblp, int protocol) | |
1288 | { | |
1289 | int r, alts; | |
1290 | ||
1291 | if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL) | |
1292 | return -EINVAL; | |
1293 | ||
1294 | alts = usblp->protocol[protocol].alt_setting; | |
1295 | if (alts < 0) | |
1296 | return -EINVAL; | |
1297 | r = usb_set_interface(usblp->dev, usblp->ifnum, alts); | |
1298 | if (r < 0) { | |
317c67b8 | 1299 | printk(KERN_ERR "usblp: can't set desired altsetting %d on interface %d\n", |
1da177e4 LT |
1300 | alts, usblp->ifnum); |
1301 | return r; | |
1302 | } | |
1303 | ||
1da177e4 | 1304 | usblp->bidir = (usblp->protocol[protocol].epread != NULL); |
1da177e4 LT |
1305 | usblp->current_protocol = protocol; |
1306 | dbg("usblp%d set protocol %d", usblp->minor, protocol); | |
1307 | return 0; | |
1308 | } | |
1309 | ||
1310 | /* Retrieves and caches device ID string. | |
1311 | * Returns length, including length bytes but not null terminator. | |
1312 | * On error, returns a negative errno value. */ | |
1313 | static int usblp_cache_device_id_string(struct usblp *usblp) | |
1314 | { | |
1315 | int err, length; | |
1316 | ||
1317 | err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1); | |
1318 | if (err < 0) { | |
1319 | dbg("usblp%d: error = %d reading IEEE-1284 Device ID string", | |
1320 | usblp->minor, err); | |
1321 | usblp->device_id_string[0] = usblp->device_id_string[1] = '\0'; | |
1322 | return -EIO; | |
1323 | } | |
1324 | ||
1325 | /* First two bytes are length in big-endian. | |
1326 | * They count themselves, and we copy them into | |
1327 | * the user's buffer. */ | |
1328 | length = be16_to_cpu(*((__be16 *)usblp->device_id_string)); | |
1329 | if (length < 2) | |
1330 | length = 2; | |
1331 | else if (length >= USBLP_DEVICE_ID_SIZE) | |
1332 | length = USBLP_DEVICE_ID_SIZE - 1; | |
1333 | usblp->device_id_string[length] = '\0'; | |
1334 | ||
1335 | dbg("usblp%d Device ID string [len=%d]=\"%s\"", | |
1336 | usblp->minor, length, &usblp->device_id_string[2]); | |
1337 | ||
1338 | return length; | |
1339 | } | |
1340 | ||
1341 | static void usblp_disconnect(struct usb_interface *intf) | |
1342 | { | |
916de027 | 1343 | struct usblp *usblp = usb_get_intfdata(intf); |
1da177e4 LT |
1344 | |
1345 | usb_deregister_dev(intf, &usblp_class); | |
1346 | ||
1347 | if (!usblp || !usblp->dev) { | |
9908a32e | 1348 | dev_err(&intf->dev, "bogus disconnect\n"); |
916de027 | 1349 | BUG(); |
1da177e4 LT |
1350 | } |
1351 | ||
a9714c84 DW |
1352 | device_remove_file(&intf->dev, &dev_attr_ieee1284_id); |
1353 | ||
916de027 NK |
1354 | mutex_lock(&usblp_mutex); |
1355 | mutex_lock(&usblp->mut); | |
1da177e4 | 1356 | usblp->present = 0; |
317c67b8 PZ |
1357 | wake_up(&usblp->wwait); |
1358 | wake_up(&usblp->rwait); | |
916de027 | 1359 | usb_set_intfdata(intf, NULL); |
1da177e4 LT |
1360 | |
1361 | usblp_unlink_urbs(usblp); | |
916de027 | 1362 | mutex_unlock(&usblp->mut); |
1da177e4 LT |
1363 | |
1364 | if (!usblp->used) | |
916de027 NK |
1365 | usblp_cleanup(usblp); |
1366 | mutex_unlock(&usblp_mutex); | |
1da177e4 LT |
1367 | } |
1368 | ||
3a90f818 | 1369 | static int usblp_suspend(struct usb_interface *intf, pm_message_t message) |
516077c1 | 1370 | { |
916de027 | 1371 | struct usblp *usblp = usb_get_intfdata(intf); |
516077c1 | 1372 | |
516077c1 | 1373 | usblp_unlink_urbs(usblp); |
317c67b8 PZ |
1374 | #if 0 /* XXX Do we want this? What if someone is reading, should we fail? */ |
1375 | /* not strictly necessary, but just in case */ | |
1376 | wake_up(&usblp->wwait); | |
1377 | wake_up(&usblp->rwait); | |
1378 | #endif | |
516077c1 ON |
1379 | |
1380 | return 0; | |
1381 | } | |
1382 | ||
3a90f818 | 1383 | static int usblp_resume(struct usb_interface *intf) |
516077c1 | 1384 | { |
916de027 | 1385 | struct usblp *usblp = usb_get_intfdata(intf); |
516077c1 ON |
1386 | int r; |
1387 | ||
916de027 | 1388 | r = handle_bidir(usblp); |
516077c1 | 1389 | |
516077c1 ON |
1390 | return r; |
1391 | } | |
1392 | ||
6ef4852b | 1393 | static const struct usb_device_id usblp_ids[] = { |
1da177e4 LT |
1394 | { USB_DEVICE_INFO(7, 1, 1) }, |
1395 | { USB_DEVICE_INFO(7, 1, 2) }, | |
1396 | { USB_DEVICE_INFO(7, 1, 3) }, | |
1397 | { USB_INTERFACE_INFO(7, 1, 1) }, | |
1398 | { USB_INTERFACE_INFO(7, 1, 2) }, | |
1399 | { USB_INTERFACE_INFO(7, 1, 3) }, | |
5ec71db5 | 1400 | { USB_DEVICE(0x04b8, 0x0202) }, /* Seiko Epson Receipt Printer M129C */ |
1da177e4 LT |
1401 | { } /* Terminating entry */ |
1402 | }; | |
1403 | ||
916de027 | 1404 | MODULE_DEVICE_TABLE(usb, usblp_ids); |
1da177e4 LT |
1405 | |
1406 | static struct usb_driver usblp_driver = { | |
1da177e4 LT |
1407 | .name = "usblp", |
1408 | .probe = usblp_probe, | |
1409 | .disconnect = usblp_disconnect, | |
516077c1 ON |
1410 | .suspend = usblp_suspend, |
1411 | .resume = usblp_resume, | |
1da177e4 | 1412 | .id_table = usblp_ids, |
d0532184 | 1413 | .supports_autosuspend = 1, |
1da177e4 LT |
1414 | }; |
1415 | ||
1416 | static int __init usblp_init(void) | |
1417 | { | |
317c67b8 | 1418 | return usb_register(&usblp_driver); |
1da177e4 LT |
1419 | } |
1420 | ||
1421 | static void __exit usblp_exit(void) | |
1422 | { | |
1423 | usb_deregister(&usblp_driver); | |
1424 | } | |
1425 | ||
1426 | module_init(usblp_init); | |
1427 | module_exit(usblp_exit); | |
1428 | ||
916de027 NK |
1429 | MODULE_AUTHOR(DRIVER_AUTHOR); |
1430 | MODULE_DESCRIPTION(DRIVER_DESC); | |
1da177e4 LT |
1431 | module_param(proto_bias, int, S_IRUGO | S_IWUSR); |
1432 | MODULE_PARM_DESC(proto_bias, "Favourite protocol number"); | |
1433 | MODULE_LICENSE("GPL"); |