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spi-topcliff-pch: add recovery processing in case wait-event timeout
[zen-stable.git] / drivers / usb / misc / uss720.c
blob8b1d94a769140ca0ab6f9f6a082384b8725c9873
1 /*****************************************************************************/
2
3 /*
4 * uss720.c -- USS720 USB Parport Cable.
5 *
6 * Copyright (C) 1999, 2005, 2010
7 * Thomas Sailer (t.sailer@alumni.ethz.ch)
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *
23 * Based on parport_pc.c
24 *
25 * History:
26 * 0.1 04.08.1999 Created
27 * 0.2 07.08.1999 Some fixes mainly suggested by Tim Waugh
28 * Interrupt handling currently disabled because
29 * usb_request_irq crashes somewhere within ohci.c
30 * for no apparent reason (that is for me, anyway)
31 * ECP currently untested
32 * 0.3 10.08.1999 fixing merge errors
33 * 0.4 13.08.1999 Added Vendor/Product ID of Brad Hard's cable
34 * 0.5 20.09.1999 usb_control_msg wrapper used
35 * Nov01.2000 usb_device_table support by Adam J. Richter
36 * 08.04.2001 Identify version on module load. gb
37 * 0.6 02.09.2005 Fix "scheduling in interrupt" problem by making save/restore
38 * context asynchronous
39 *
40 */
41
42 /*****************************************************************************/
43
44 #include <linux/module.h>
45 #include <linux/socket.h>
46 #include <linux/parport.h>
47 #include <linux/init.h>
48 #include <linux/usb.h>
49 #include <linux/delay.h>
50 #include <linux/completion.h>
51 #include <linux/kref.h>
52 #include <linux/slab.h>
53
54 /*
55 * Version Information
56 */
57 #define DRIVER_VERSION "v0.6"
58 #define DRIVER_AUTHOR "Thomas M. Sailer, t.sailer@alumni.ethz.ch"
59 #define DRIVER_DESC "USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip"
60
61 /* --------------------------------------------------------------------- */
62
63 struct parport_uss720_private {
64 struct usb_device *usbdev;
65 struct parport *pp;
66 struct kref ref_count;
67 __u8 reg[7]; /* USB registers */
68 struct list_head asynclist;
69 spinlock_t asynclock;
70 };
71
72 struct uss720_async_request {
73 struct parport_uss720_private *priv;
74 struct kref ref_count;
75 struct list_head asynclist;
76 struct completion compl;
77 struct urb *urb;
78 struct usb_ctrlrequest dr;
79 __u8 reg[7];
80 };
81
82 /* --------------------------------------------------------------------- */
83
84 static void destroy_priv(struct kref *kref)
85 {
86 struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count);
87
88 usb_put_dev(priv->usbdev);
89 kfree(priv);
90 dbg("destroying priv datastructure");
91 }
92
93 static void destroy_async(struct kref *kref)
94 {
95 struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count);
96 struct parport_uss720_private *priv = rq->priv;
97 unsigned long flags;
98
99 if (likely(rq->urb))
100 usb_free_urb(rq->urb);
101 spin_lock_irqsave(&priv->asynclock, flags);
102 list_del_init(&rq->asynclist);
103 spin_unlock_irqrestore(&priv->asynclock, flags);
104 kfree(rq);
105 kref_put(&priv->ref_count, destroy_priv);
106 }
107
108 /* --------------------------------------------------------------------- */
109
110 static void async_complete(struct urb *urb)
111 {
112 struct uss720_async_request *rq;
113 struct parport *pp;
114 struct parport_uss720_private *priv;
115 int status = urb->status;
116
117 rq = urb->context;
118 priv = rq->priv;
119 pp = priv->pp;
120 if (status) {
121 err("async_complete: urb error %d", status);
122 } else if (rq->dr.bRequest == 3) {
123 memcpy(priv->reg, rq->reg, sizeof(priv->reg));
124 #if 0
125 dbg("async_complete regs %02x %02x %02x %02x %02x %02x %02x",
126 (unsigned int)priv->reg[0], (unsigned int)priv->reg[1], (unsigned int)priv->reg[2],
127 (unsigned int)priv->reg[3], (unsigned int)priv->reg[4], (unsigned int)priv->reg[5],
128 (unsigned int)priv->reg[6]);
129 #endif
130 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
131 if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
132 parport_generic_irq(pp);
133 }
134 complete(&rq->compl);
135 kref_put(&rq->ref_count, destroy_async);
136 }
137
138 static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
139 __u8 request, __u8 requesttype, __u16 value, __u16 index,
140 gfp_t mem_flags)
141 {
142 struct usb_device *usbdev;
143 struct uss720_async_request *rq;
144 unsigned long flags;
145 int ret;
146
147 if (!priv)
148 return NULL;
149 usbdev = priv->usbdev;
150 if (!usbdev)
151 return NULL;
152 rq = kmalloc(sizeof(struct uss720_async_request), mem_flags);
153 if (!rq) {
154 err("submit_async_request out of memory");
155 return NULL;
156 }
157 kref_init(&rq->ref_count);
158 INIT_LIST_HEAD(&rq->asynclist);
159 init_completion(&rq->compl);
160 kref_get(&priv->ref_count);
161 rq->priv = priv;
162 rq->urb = usb_alloc_urb(0, mem_flags);
163 if (!rq->urb) {
164 kref_put(&rq->ref_count, destroy_async);
165 err("submit_async_request out of memory");
166 return NULL;
167 }
168 rq->dr.bRequestType = requesttype;
169 rq->dr.bRequest = request;
170 rq->dr.wValue = cpu_to_le16(value);
171 rq->dr.wIndex = cpu_to_le16(index);
172 rq->dr.wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
173 usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
174 (unsigned char *)&rq->dr,
175 (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
176 /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
177 spin_lock_irqsave(&priv->asynclock, flags);
178 list_add_tail(&rq->asynclist, &priv->asynclist);
179 spin_unlock_irqrestore(&priv->asynclock, flags);
180 kref_get(&rq->ref_count);
181 ret = usb_submit_urb(rq->urb, mem_flags);
182 if (!ret)
183 return rq;
184 destroy_async(&rq->ref_count);
185 err("submit_async_request submit_urb failed with %d", ret);
186 return NULL;
187 }
188
189 static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
190 {
191 struct uss720_async_request *rq;
192 unsigned long flags;
193 unsigned int ret = 0;
194
195 spin_lock_irqsave(&priv->asynclock, flags);
196 list_for_each_entry(rq, &priv->asynclist, asynclist) {
197 usb_unlink_urb(rq->urb);
198 ret++;
199 }
200 spin_unlock_irqrestore(&priv->asynclock, flags);
201 return ret;
202 }
203
204 /* --------------------------------------------------------------------- */
205
206 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
207 {
208 struct parport_uss720_private *priv;
209 struct uss720_async_request *rq;
210 static const unsigned char regindex[9] = {
211 4, 0, 1, 5, 5, 0, 2, 3, 6
212 };
213 int ret;
214
215 if (!pp)
216 return -EIO;
217 priv = pp->private_data;
218 rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
219 if (!rq) {
220 err("get_1284_register(%u) failed", (unsigned int)reg);
221 return -EIO;
222 }
223 if (!val) {
224 kref_put(&rq->ref_count, destroy_async);
225 return 0;
226 }
227 if (wait_for_completion_timeout(&rq->compl, HZ)) {
228 ret = rq->urb->status;
229 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
230 if (ret)
231 printk(KERN_WARNING "get_1284_register: "
232 "usb error %d\n", ret);
233 kref_put(&rq->ref_count, destroy_async);
234 return ret;
235 }
236 printk(KERN_WARNING "get_1284_register timeout\n");
237 kill_all_async_requests_priv(priv);
238 return -EIO;
239 }
240
241 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
242 {
243 struct parport_uss720_private *priv;
244 struct uss720_async_request *rq;
245
246 if (!pp)
247 return -EIO;
248 priv = pp->private_data;
249 rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
250 if (!rq) {
251 err("set_1284_register(%u,%u) failed", (unsigned int)reg, (unsigned int)val);
252 return -EIO;
253 }
254 kref_put(&rq->ref_count, destroy_async);
255 return 0;
256 }
257
258 /* --------------------------------------------------------------------- */
259
260 /* ECR modes */
261 #define ECR_SPP 00
262 #define ECR_PS2 01
263 #define ECR_PPF 02
264 #define ECR_ECP 03
265 #define ECR_EPP 04
266
267 /* Safely change the mode bits in the ECR */
268 static int change_mode(struct parport *pp, int m)
269 {
270 struct parport_uss720_private *priv = pp->private_data;
271 int mode;
272 __u8 reg;
273
274 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
275 return -EIO;
276 /* Bits <7:5> contain the mode. */
277 mode = (priv->reg[2] >> 5) & 0x7;
278 if (mode == m)
279 return 0;
280 /* We have to go through mode 000 or 001 */
281 if (mode > ECR_PS2 && m > ECR_PS2)
282 if (change_mode(pp, ECR_PS2))
283 return -EIO;
284
285 if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
286 /* This mode resets the FIFO, so we may
287 * have to wait for it to drain first. */
288 unsigned long expire = jiffies + pp->physport->cad->timeout;
289 switch (mode) {
290 case ECR_PPF: /* Parallel Port FIFO mode */
291 case ECR_ECP: /* ECP Parallel Port mode */
292 /* Poll slowly. */
293 for (;;) {
294 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
295 return -EIO;
296 if (priv->reg[2] & 0x01)
297 break;
298 if (time_after_eq (jiffies, expire))
299 /* The FIFO is stuck. */
300 return -EBUSY;
301 msleep_interruptible(10);
302 if (signal_pending (current))
303 break;
304 }
305 }
306 }
307 /* Set the mode. */
308 if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
309 return -EIO;
310 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
311 return -EIO;
312 return 0;
313 }
314
315 /*
316 * Clear TIMEOUT BIT in EPP MODE
317 */
318 static int clear_epp_timeout(struct parport *pp)
319 {
320 unsigned char stat;
321
322 if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
323 return 1;
324 return stat & 1;
325 }
326
327 /*
328 * Access functions.
329 */
330 #if 0
331 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
332 {
333 struct parport *pp = (struct parport *)dev_id;
334 struct parport_uss720_private *priv = pp->private_data;
335
336 if (usbstatus != 0 || len < 4 || !buffer)
337 return 1;
338 memcpy(priv->reg, buffer, 4);
339 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
340 if (priv->reg[2] & priv->reg[1] & 0x10)
341 parport_generic_irq(pp);
342 return 1;
343 }
344 #endif
345
346 static void parport_uss720_write_data(struct parport *pp, unsigned char d)
347 {
348 set_1284_register(pp, 0, d, GFP_KERNEL);
349 }
350
351 static unsigned char parport_uss720_read_data(struct parport *pp)
352 {
353 unsigned char ret;
354
355 if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
356 return 0;
357 return ret;
358 }
359
360 static void parport_uss720_write_control(struct parport *pp, unsigned char d)
361 {
362 struct parport_uss720_private *priv = pp->private_data;
363
364 d = (d & 0xf) | (priv->reg[1] & 0xf0);
365 if (set_1284_register(pp, 2, d, GFP_KERNEL))
366 return;
367 priv->reg[1] = d;
368 }
369
370 static unsigned char parport_uss720_read_control(struct parport *pp)
371 {
372 struct parport_uss720_private *priv = pp->private_data;
373 return priv->reg[1] & 0xf; /* Use soft copy */
374 }
375
376 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
377 {
378 struct parport_uss720_private *priv = pp->private_data;
379 unsigned char d;
380
381 mask &= 0x0f;
382 val &= 0x0f;
383 d = (priv->reg[1] & (~mask)) ^ val;
384 if (set_1284_register(pp, 2, d, GFP_KERNEL))
385 return 0;
386 priv->reg[1] = d;
387 return d & 0xf;
388 }
389
390 static unsigned char parport_uss720_read_status(struct parport *pp)
391 {
392 unsigned char ret;
393
394 if (get_1284_register(pp, 1, &ret, GFP_KERNEL))
395 return 0;
396 return ret & 0xf8;
397 }
398
399 static void parport_uss720_disable_irq(struct parport *pp)
400 {
401 struct parport_uss720_private *priv = pp->private_data;
402 unsigned char d;
403
404 d = priv->reg[1] & ~0x10;
405 if (set_1284_register(pp, 2, d, GFP_KERNEL))
406 return;
407 priv->reg[1] = d;
408 }
409
410 static void parport_uss720_enable_irq(struct parport *pp)
411 {
412 struct parport_uss720_private *priv = pp->private_data;
413 unsigned char d;
414
415 d = priv->reg[1] | 0x10;
416 if (set_1284_register(pp, 2, d, GFP_KERNEL))
417 return;
418 priv->reg[1] = d;
419 }
420
421 static void parport_uss720_data_forward (struct parport *pp)
422 {
423 struct parport_uss720_private *priv = pp->private_data;
424 unsigned char d;
425
426 d = priv->reg[1] & ~0x20;
427 if (set_1284_register(pp, 2, d, GFP_KERNEL))
428 return;
429 priv->reg[1] = d;
430 }
431
432 static void parport_uss720_data_reverse (struct parport *pp)
433 {
434 struct parport_uss720_private *priv = pp->private_data;
435 unsigned char d;
436
437 d = priv->reg[1] | 0x20;
438 if (set_1284_register(pp, 2, d, GFP_KERNEL))
439 return;
440 priv->reg[1] = d;
441 }
442
443 static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
444 {
445 s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
446 s->u.pc.ecr = 0x24;
447 }
448
449 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
450 {
451 struct parport_uss720_private *priv = pp->private_data;
452
453 #if 0
454 if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
455 return;
456 #endif
457 s->u.pc.ctr = priv->reg[1];
458 s->u.pc.ecr = priv->reg[2];
459 }
460
461 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
462 {
463 struct parport_uss720_private *priv = pp->private_data;
464
465 set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
466 set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
467 get_1284_register(pp, 2, NULL, GFP_ATOMIC);
468 priv->reg[1] = s->u.pc.ctr;
469 priv->reg[2] = s->u.pc.ecr;
470 }
471
472 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
473 {
474 struct parport_uss720_private *priv = pp->private_data;
475 size_t got = 0;
476
477 if (change_mode(pp, ECR_EPP))
478 return 0;
479 for (; got < length; got++) {
480 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
481 break;
482 buf++;
483 if (priv->reg[0] & 0x01) {
484 clear_epp_timeout(pp);
485 break;
486 }
487 }
488 change_mode(pp, ECR_PS2);
489 return got;
490 }
491
492 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
493 {
494 #if 0
495 struct parport_uss720_private *priv = pp->private_data;
496 size_t written = 0;
497
498 if (change_mode(pp, ECR_EPP))
499 return 0;
500 for (; written < length; written++) {
501 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
502 break;
503 ((char*)buf)++;
504 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
505 break;
506 if (priv->reg[0] & 0x01) {
507 clear_epp_timeout(pp);
508 break;
509 }
510 }
511 change_mode(pp, ECR_PS2);
512 return written;
513 #else
514 struct parport_uss720_private *priv = pp->private_data;
515 struct usb_device *usbdev = priv->usbdev;
516 int rlen;
517 int i;
518
519 if (!usbdev)
520 return 0;
521 if (change_mode(pp, ECR_EPP))
522 return 0;
523 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
524 if (i)
525 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buf, length, rlen);
526 change_mode(pp, ECR_PS2);
527 return rlen;
528 #endif
529 }
530
531 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
532 {
533 struct parport_uss720_private *priv = pp->private_data;
534 size_t got = 0;
535
536 if (change_mode(pp, ECR_EPP))
537 return 0;
538 for (; got < length; got++) {
539 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
540 break;
541 buf++;
542 if (priv->reg[0] & 0x01) {
543 clear_epp_timeout(pp);
544 break;
545 }
546 }
547 change_mode(pp, ECR_PS2);
548 return got;
549 }
550
551 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
552 {
553 struct parport_uss720_private *priv = pp->private_data;
554 size_t written = 0;
555
556 if (change_mode(pp, ECR_EPP))
557 return 0;
558 for (; written < length; written++) {
559 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
560 break;
561 buf++;
562 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
563 break;
564 if (priv->reg[0] & 0x01) {
565 clear_epp_timeout(pp);
566 break;
567 }
568 }
569 change_mode(pp, ECR_PS2);
570 return written;
571 }
572
573 static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
574 {
575 struct parport_uss720_private *priv = pp->private_data;
576 struct usb_device *usbdev = priv->usbdev;
577 int rlen;
578 int i;
579
580 if (!usbdev)
581 return 0;
582 if (change_mode(pp, ECR_ECP))
583 return 0;
584 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
585 if (i)
586 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
587 change_mode(pp, ECR_PS2);
588 return rlen;
589 }
590
591 static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
592 {
593 struct parport_uss720_private *priv = pp->private_data;
594 struct usb_device *usbdev = priv->usbdev;
595 int rlen;
596 int i;
597
598 if (!usbdev)
599 return 0;
600 if (change_mode(pp, ECR_ECP))
601 return 0;
602 i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
603 if (i)
604 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %Zu rlen %u\n", buffer, len, rlen);
605 change_mode(pp, ECR_PS2);
606 return rlen;
607 }
608
609 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
610 {
611 size_t written = 0;
612
613 if (change_mode(pp, ECR_ECP))
614 return 0;
615 for (; written < len; written++) {
616 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
617 break;
618 buffer++;
619 }
620 change_mode(pp, ECR_PS2);
621 return written;
622 }
623
624 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
625 {
626 struct parport_uss720_private *priv = pp->private_data;
627 struct usb_device *usbdev = priv->usbdev;
628 int rlen;
629 int i;
630
631 if (!usbdev)
632 return 0;
633 if (change_mode(pp, ECR_PPF))
634 return 0;
635 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
636 if (i)
637 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
638 change_mode(pp, ECR_PS2);
639 return rlen;
640 }
641
642 /* --------------------------------------------------------------------- */
643
644 static struct parport_operations parport_uss720_ops =
645 {
646 .owner = THIS_MODULE,
647 .write_data = parport_uss720_write_data,
648 .read_data = parport_uss720_read_data,
649
650 .write_control = parport_uss720_write_control,
651 .read_control = parport_uss720_read_control,
652 .frob_control = parport_uss720_frob_control,
653
654 .read_status = parport_uss720_read_status,
655
656 .enable_irq = parport_uss720_enable_irq,
657 .disable_irq = parport_uss720_disable_irq,
658
659 .data_forward = parport_uss720_data_forward,
660 .data_reverse = parport_uss720_data_reverse,
661
662 .init_state = parport_uss720_init_state,
663 .save_state = parport_uss720_save_state,
664 .restore_state = parport_uss720_restore_state,
665
666 .epp_write_data = parport_uss720_epp_write_data,
667 .epp_read_data = parport_uss720_epp_read_data,
668 .epp_write_addr = parport_uss720_epp_write_addr,
669 .epp_read_addr = parport_uss720_epp_read_addr,
670
671 .ecp_write_data = parport_uss720_ecp_write_data,
672 .ecp_read_data = parport_uss720_ecp_read_data,
673 .ecp_write_addr = parport_uss720_ecp_write_addr,
674
675 .compat_write_data = parport_uss720_write_compat,
676 .nibble_read_data = parport_ieee1284_read_nibble,
677 .byte_read_data = parport_ieee1284_read_byte,
678 };
679
680 /* --------------------------------------------------------------------- */
681
682 static int uss720_probe(struct usb_interface *intf,
683 const struct usb_device_id *id)
684 {
685 struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
686 struct usb_host_interface *interface;
687 struct usb_host_endpoint *endpoint;
688 struct parport_uss720_private *priv;
689 struct parport *pp;
690 unsigned char reg;
691 int i;
692
693 dbg("probe: vendor id 0x%x, device id 0x%x\n",
694 le16_to_cpu(usbdev->descriptor.idVendor),
695 le16_to_cpu(usbdev->descriptor.idProduct));
696
697 /* our known interfaces have 3 alternate settings */
698 if (intf->num_altsetting != 3) {
699 usb_put_dev(usbdev);
700 return -ENODEV;
701 }
702 i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
703 dbg("set inteface result %d", i);
704
705 interface = intf->cur_altsetting;
706
707 /*
708 * Allocate parport interface
709 */
710 if (!(priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL))) {
711 usb_put_dev(usbdev);
712 return -ENOMEM;
713 }
714 priv->pp = NULL;
715 priv->usbdev = usbdev;
716 kref_init(&priv->ref_count);
717 spin_lock_init(&priv->asynclock);
718 INIT_LIST_HEAD(&priv->asynclist);
719 if (!(pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops))) {
720 printk(KERN_WARNING "uss720: could not register parport\n");
721 goto probe_abort;
722 }
723
724 priv->pp = pp;
725 pp->private_data = priv;
726 pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
727
728 /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
729 set_1284_register(pp, 7, 0x00, GFP_KERNEL);
730 set_1284_register(pp, 6, 0x30, GFP_KERNEL); /* PS/2 mode */
731 set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
732 /* debugging */
733 get_1284_register(pp, 0, &reg, GFP_KERNEL);
734 dbg("reg: %02x %02x %02x %02x %02x %02x %02x",
735 priv->reg[0], priv->reg[1], priv->reg[2], priv->reg[3], priv->reg[4], priv->reg[5], priv->reg[6]);
736
737 endpoint = &interface->endpoint[2];
738 dbg("epaddr %d interval %d", endpoint->desc.bEndpointAddress, endpoint->desc.bInterval);
739 parport_announce_port(pp);
740
741 usb_set_intfdata(intf, pp);
742 return 0;
743
744 probe_abort:
745 kill_all_async_requests_priv(priv);
746 kref_put(&priv->ref_count, destroy_priv);
747 return -ENODEV;
748 }
749
750 static void uss720_disconnect(struct usb_interface *intf)
751 {
752 struct parport *pp = usb_get_intfdata(intf);
753 struct parport_uss720_private *priv;
754 struct usb_device *usbdev;
755
756 dbg("disconnect");
757 usb_set_intfdata(intf, NULL);
758 if (pp) {
759 priv = pp->private_data;
760 usbdev = priv->usbdev;
761 priv->usbdev = NULL;
762 priv->pp = NULL;
763 dbg("parport_remove_port");
764 parport_remove_port(pp);
765 parport_put_port(pp);
766 kill_all_async_requests_priv(priv);
767 kref_put(&priv->ref_count, destroy_priv);
768 }
769 dbg("disconnect done");
770 }
771
772 /* table of cables that work through this driver */
773 static const struct usb_device_id uss720_table[] = {
774 { USB_DEVICE(0x047e, 0x1001) },
775 { USB_DEVICE(0x0557, 0x2001) },
776 { USB_DEVICE(0x0729, 0x1284) },
777 { USB_DEVICE(0x1293, 0x0002) },
778 { USB_DEVICE(0x050d, 0x0002) },
779 { } /* Terminating entry */
780 };
781
782 MODULE_DEVICE_TABLE (usb, uss720_table);
783
784
785 static struct usb_driver uss720_driver = {
786 .name = "uss720",
787 .probe = uss720_probe,
788 .disconnect = uss720_disconnect,
789 .id_table = uss720_table,
790 };
791
792 /* --------------------------------------------------------------------- */
793
794 MODULE_AUTHOR(DRIVER_AUTHOR);
795 MODULE_DESCRIPTION(DRIVER_DESC);
796 MODULE_LICENSE("GPL");
797
798 static int __init uss720_init(void)
799 {
800 int retval;
801 retval = usb_register(&uss720_driver);
802 if (retval)
803 goto out;
804
805 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
806 DRIVER_DESC "\n");
807 printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose "
808 "driver to allow nonstandard\n");
809 printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over "
810 "USS720 usb to parallel cables\n");
811 printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a "
812 "printer, use usblp instead\n");
813 out:
814 return retval;
815 }
816
817 static void __exit uss720_cleanup(void)
818 {
819 usb_deregister(&uss720_driver);
820 }
821
822 module_init(uss720_init);
823 module_exit(uss720_cleanup);
824
825 /* --------------------------------------------------------------------- */