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ARC: [plat-eznps] spinlock aware for MTM
[linux/fpc-iii.git] / drivers / usb / misc / uss720.c
blob5947373700a197a4e62bb62bbf5940c33271d610
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 #include <linux/sched/signal.h>
54
55 /*
56 * Version Information
57 */
58 #define DRIVER_VERSION "v0.6"
59 #define DRIVER_AUTHOR "Thomas M. Sailer, t.sailer@alumni.ethz.ch"
60 #define DRIVER_DESC "USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip"
61
62 /* --------------------------------------------------------------------- */
63
64 struct parport_uss720_private {
65 struct usb_device *usbdev;
66 struct parport *pp;
67 struct kref ref_count;
68 __u8 reg[7]; /* USB registers */
69 struct list_head asynclist;
70 spinlock_t asynclock;
71 };
72
73 struct uss720_async_request {
74 struct parport_uss720_private *priv;
75 struct kref ref_count;
76 struct list_head asynclist;
77 struct completion compl;
78 struct urb *urb;
79 struct usb_ctrlrequest *dr;
80 __u8 reg[7];
81 };
82
83 /* --------------------------------------------------------------------- */
84
85 static void destroy_priv(struct kref *kref)
86 {
87 struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count);
88
89 dev_dbg(&priv->usbdev->dev, "destroying priv datastructure\n");
90 usb_put_dev(priv->usbdev);
91 kfree(priv);
92 }
93
94 static void destroy_async(struct kref *kref)
95 {
96 struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count);
97 struct parport_uss720_private *priv = rq->priv;
98 unsigned long flags;
99
100 if (likely(rq->urb))
101 usb_free_urb(rq->urb);
102 kfree(rq->dr);
103 spin_lock_irqsave(&priv->asynclock, flags);
104 list_del_init(&rq->asynclist);
105 spin_unlock_irqrestore(&priv->asynclock, flags);
106 kfree(rq);
107 kref_put(&priv->ref_count, destroy_priv);
108 }
109
110 /* --------------------------------------------------------------------- */
111
112 static void async_complete(struct urb *urb)
113 {
114 struct uss720_async_request *rq;
115 struct parport *pp;
116 struct parport_uss720_private *priv;
117 int status = urb->status;
118
119 rq = urb->context;
120 priv = rq->priv;
121 pp = priv->pp;
122 if (status) {
123 dev_err(&urb->dev->dev, "async_complete: urb error %d\n",
124 status);
125 } else if (rq->dr->bRequest == 3) {
126 memcpy(priv->reg, rq->reg, sizeof(priv->reg));
127 #if 0
128 dev_dbg(&priv->usbdev->dev, "async_complete regs %7ph\n",
129 priv->reg);
130 #endif
131 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
132 if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
133 parport_generic_irq(pp);
134 }
135 complete(&rq->compl);
136 kref_put(&rq->ref_count, destroy_async);
137 }
138
139 static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
140 __u8 request, __u8 requesttype, __u16 value, __u16 index,
141 gfp_t mem_flags)
142 {
143 struct usb_device *usbdev;
144 struct uss720_async_request *rq;
145 unsigned long flags;
146 int ret;
147
148 if (!priv)
149 return NULL;
150 usbdev = priv->usbdev;
151 if (!usbdev)
152 return NULL;
153 rq = kzalloc(sizeof(struct uss720_async_request), mem_flags);
154 if (!rq)
155 return NULL;
156 kref_init(&rq->ref_count);
157 INIT_LIST_HEAD(&rq->asynclist);
158 init_completion(&rq->compl);
159 kref_get(&priv->ref_count);
160 rq->priv = priv;
161 rq->urb = usb_alloc_urb(0, mem_flags);
162 if (!rq->urb) {
163 kref_put(&rq->ref_count, destroy_async);
164 return NULL;
165 }
166 rq->dr = kmalloc(sizeof(*rq->dr), mem_flags);
167 if (!rq->dr) {
168 kref_put(&rq->ref_count, destroy_async);
169 return NULL;
170 }
171 rq->dr->bRequestType = requesttype;
172 rq->dr->bRequest = request;
173 rq->dr->wValue = cpu_to_le16(value);
174 rq->dr->wIndex = cpu_to_le16(index);
175 rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
176 usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
177 (unsigned char *)rq->dr,
178 (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
179 /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
180 spin_lock_irqsave(&priv->asynclock, flags);
181 list_add_tail(&rq->asynclist, &priv->asynclist);
182 spin_unlock_irqrestore(&priv->asynclock, flags);
183 kref_get(&rq->ref_count);
184 ret = usb_submit_urb(rq->urb, mem_flags);
185 if (!ret)
186 return rq;
187 destroy_async(&rq->ref_count);
188 dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
189 return NULL;
190 }
191
192 static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
193 {
194 struct uss720_async_request *rq;
195 unsigned long flags;
196 unsigned int ret = 0;
197
198 spin_lock_irqsave(&priv->asynclock, flags);
199 list_for_each_entry(rq, &priv->asynclist, asynclist) {
200 usb_unlink_urb(rq->urb);
201 ret++;
202 }
203 spin_unlock_irqrestore(&priv->asynclock, flags);
204 return ret;
205 }
206
207 /* --------------------------------------------------------------------- */
208
209 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
210 {
211 struct parport_uss720_private *priv;
212 struct uss720_async_request *rq;
213 static const unsigned char regindex[9] = {
214 4, 0, 1, 5, 5, 0, 2, 3, 6
215 };
216 int ret;
217
218 if (!pp)
219 return -EIO;
220 priv = pp->private_data;
221 rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
222 if (!rq) {
223 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
224 (unsigned int)reg);
225 return -EIO;
226 }
227 if (!val) {
228 kref_put(&rq->ref_count, destroy_async);
229 return 0;
230 }
231 if (wait_for_completion_timeout(&rq->compl, HZ)) {
232 ret = rq->urb->status;
233 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
234 if (ret)
235 printk(KERN_WARNING "get_1284_register: "
236 "usb error %d\n", ret);
237 kref_put(&rq->ref_count, destroy_async);
238 return ret;
239 }
240 printk(KERN_WARNING "get_1284_register timeout\n");
241 kill_all_async_requests_priv(priv);
242 return -EIO;
243 }
244
245 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
246 {
247 struct parport_uss720_private *priv;
248 struct uss720_async_request *rq;
249
250 if (!pp)
251 return -EIO;
252 priv = pp->private_data;
253 rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
254 if (!rq) {
255 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
256 (unsigned int)reg, (unsigned int)val);
257 return -EIO;
258 }
259 kref_put(&rq->ref_count, destroy_async);
260 return 0;
261 }
262
263 /* --------------------------------------------------------------------- */
264
265 /* ECR modes */
266 #define ECR_SPP 00
267 #define ECR_PS2 01
268 #define ECR_PPF 02
269 #define ECR_ECP 03
270 #define ECR_EPP 04
271
272 /* Safely change the mode bits in the ECR */
273 static int change_mode(struct parport *pp, int m)
274 {
275 struct parport_uss720_private *priv = pp->private_data;
276 int mode;
277 __u8 reg;
278
279 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
280 return -EIO;
281 /* Bits <7:5> contain the mode. */
282 mode = (priv->reg[2] >> 5) & 0x7;
283 if (mode == m)
284 return 0;
285 /* We have to go through mode 000 or 001 */
286 if (mode > ECR_PS2 && m > ECR_PS2)
287 if (change_mode(pp, ECR_PS2))
288 return -EIO;
289
290 if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
291 /* This mode resets the FIFO, so we may
292 * have to wait for it to drain first. */
293 unsigned long expire = jiffies + pp->physport->cad->timeout;
294 switch (mode) {
295 case ECR_PPF: /* Parallel Port FIFO mode */
296 case ECR_ECP: /* ECP Parallel Port mode */
297 /* Poll slowly. */
298 for (;;) {
299 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
300 return -EIO;
301 if (priv->reg[2] & 0x01)
302 break;
303 if (time_after_eq (jiffies, expire))
304 /* The FIFO is stuck. */
305 return -EBUSY;
306 msleep_interruptible(10);
307 if (signal_pending (current))
308 break;
309 }
310 }
311 }
312 /* Set the mode. */
313 if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
314 return -EIO;
315 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
316 return -EIO;
317 return 0;
318 }
319
320 /*
321 * Clear TIMEOUT BIT in EPP MODE
322 */
323 static int clear_epp_timeout(struct parport *pp)
324 {
325 unsigned char stat;
326
327 if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
328 return 1;
329 return stat & 1;
330 }
331
332 /*
333 * Access functions.
334 */
335 #if 0
336 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
337 {
338 struct parport *pp = (struct parport *)dev_id;
339 struct parport_uss720_private *priv = pp->private_data;
340
341 if (usbstatus != 0 || len < 4 || !buffer)
342 return 1;
343 memcpy(priv->reg, buffer, 4);
344 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
345 if (priv->reg[2] & priv->reg[1] & 0x10)
346 parport_generic_irq(pp);
347 return 1;
348 }
349 #endif
350
351 static void parport_uss720_write_data(struct parport *pp, unsigned char d)
352 {
353 set_1284_register(pp, 0, d, GFP_KERNEL);
354 }
355
356 static unsigned char parport_uss720_read_data(struct parport *pp)
357 {
358 unsigned char ret;
359
360 if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
361 return 0;
362 return ret;
363 }
364
365 static void parport_uss720_write_control(struct parport *pp, unsigned char d)
366 {
367 struct parport_uss720_private *priv = pp->private_data;
368
369 d = (d & 0xf) | (priv->reg[1] & 0xf0);
370 if (set_1284_register(pp, 2, d, GFP_KERNEL))
371 return;
372 priv->reg[1] = d;
373 }
374
375 static unsigned char parport_uss720_read_control(struct parport *pp)
376 {
377 struct parport_uss720_private *priv = pp->private_data;
378 return priv->reg[1] & 0xf; /* Use soft copy */
379 }
380
381 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
382 {
383 struct parport_uss720_private *priv = pp->private_data;
384 unsigned char d;
385
386 mask &= 0x0f;
387 val &= 0x0f;
388 d = (priv->reg[1] & (~mask)) ^ val;
389 if (set_1284_register(pp, 2, d, GFP_KERNEL))
390 return 0;
391 priv->reg[1] = d;
392 return d & 0xf;
393 }
394
395 static unsigned char parport_uss720_read_status(struct parport *pp)
396 {
397 unsigned char ret;
398
399 if (get_1284_register(pp, 1, &ret, GFP_KERNEL))
400 return 0;
401 return ret & 0xf8;
402 }
403
404 static void parport_uss720_disable_irq(struct parport *pp)
405 {
406 struct parport_uss720_private *priv = pp->private_data;
407 unsigned char d;
408
409 d = priv->reg[1] & ~0x10;
410 if (set_1284_register(pp, 2, d, GFP_KERNEL))
411 return;
412 priv->reg[1] = d;
413 }
414
415 static void parport_uss720_enable_irq(struct parport *pp)
416 {
417 struct parport_uss720_private *priv = pp->private_data;
418 unsigned char d;
419
420 d = priv->reg[1] | 0x10;
421 if (set_1284_register(pp, 2, d, GFP_KERNEL))
422 return;
423 priv->reg[1] = d;
424 }
425
426 static void parport_uss720_data_forward (struct parport *pp)
427 {
428 struct parport_uss720_private *priv = pp->private_data;
429 unsigned char d;
430
431 d = priv->reg[1] & ~0x20;
432 if (set_1284_register(pp, 2, d, GFP_KERNEL))
433 return;
434 priv->reg[1] = d;
435 }
436
437 static void parport_uss720_data_reverse (struct parport *pp)
438 {
439 struct parport_uss720_private *priv = pp->private_data;
440 unsigned char d;
441
442 d = priv->reg[1] | 0x20;
443 if (set_1284_register(pp, 2, d, GFP_KERNEL))
444 return;
445 priv->reg[1] = d;
446 }
447
448 static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
449 {
450 s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
451 s->u.pc.ecr = 0x24;
452 }
453
454 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
455 {
456 struct parport_uss720_private *priv = pp->private_data;
457
458 #if 0
459 if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
460 return;
461 #endif
462 s->u.pc.ctr = priv->reg[1];
463 s->u.pc.ecr = priv->reg[2];
464 }
465
466 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
467 {
468 struct parport_uss720_private *priv = pp->private_data;
469
470 set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
471 set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
472 get_1284_register(pp, 2, NULL, GFP_ATOMIC);
473 priv->reg[1] = s->u.pc.ctr;
474 priv->reg[2] = s->u.pc.ecr;
475 }
476
477 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
478 {
479 struct parport_uss720_private *priv = pp->private_data;
480 size_t got = 0;
481
482 if (change_mode(pp, ECR_EPP))
483 return 0;
484 for (; got < length; got++) {
485 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
486 break;
487 buf++;
488 if (priv->reg[0] & 0x01) {
489 clear_epp_timeout(pp);
490 break;
491 }
492 }
493 change_mode(pp, ECR_PS2);
494 return got;
495 }
496
497 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
498 {
499 #if 0
500 struct parport_uss720_private *priv = pp->private_data;
501 size_t written = 0;
502
503 if (change_mode(pp, ECR_EPP))
504 return 0;
505 for (; written < length; written++) {
506 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
507 break;
508 ((char*)buf)++;
509 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
510 break;
511 if (priv->reg[0] & 0x01) {
512 clear_epp_timeout(pp);
513 break;
514 }
515 }
516 change_mode(pp, ECR_PS2);
517 return written;
518 #else
519 struct parport_uss720_private *priv = pp->private_data;
520 struct usb_device *usbdev = priv->usbdev;
521 int rlen;
522 int i;
523
524 if (!usbdev)
525 return 0;
526 if (change_mode(pp, ECR_EPP))
527 return 0;
528 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
529 if (i)
530 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buf, length, rlen);
531 change_mode(pp, ECR_PS2);
532 return rlen;
533 #endif
534 }
535
536 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
537 {
538 struct parport_uss720_private *priv = pp->private_data;
539 size_t got = 0;
540
541 if (change_mode(pp, ECR_EPP))
542 return 0;
543 for (; got < length; got++) {
544 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
545 break;
546 buf++;
547 if (priv->reg[0] & 0x01) {
548 clear_epp_timeout(pp);
549 break;
550 }
551 }
552 change_mode(pp, ECR_PS2);
553 return got;
554 }
555
556 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
557 {
558 struct parport_uss720_private *priv = pp->private_data;
559 size_t written = 0;
560
561 if (change_mode(pp, ECR_EPP))
562 return 0;
563 for (; written < length; written++) {
564 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
565 break;
566 buf++;
567 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
568 break;
569 if (priv->reg[0] & 0x01) {
570 clear_epp_timeout(pp);
571 break;
572 }
573 }
574 change_mode(pp, ECR_PS2);
575 return written;
576 }
577
578 static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
579 {
580 struct parport_uss720_private *priv = pp->private_data;
581 struct usb_device *usbdev = priv->usbdev;
582 int rlen;
583 int i;
584
585 if (!usbdev)
586 return 0;
587 if (change_mode(pp, ECR_ECP))
588 return 0;
589 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
590 if (i)
591 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen);
592 change_mode(pp, ECR_PS2);
593 return rlen;
594 }
595
596 static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
597 {
598 struct parport_uss720_private *priv = pp->private_data;
599 struct usb_device *usbdev = priv->usbdev;
600 int rlen;
601 int i;
602
603 if (!usbdev)
604 return 0;
605 if (change_mode(pp, ECR_ECP))
606 return 0;
607 i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
608 if (i)
609 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %zu rlen %u\n", buffer, len, rlen);
610 change_mode(pp, ECR_PS2);
611 return rlen;
612 }
613
614 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
615 {
616 size_t written = 0;
617
618 if (change_mode(pp, ECR_ECP))
619 return 0;
620 for (; written < len; written++) {
621 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
622 break;
623 buffer++;
624 }
625 change_mode(pp, ECR_PS2);
626 return written;
627 }
628
629 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
630 {
631 struct parport_uss720_private *priv = pp->private_data;
632 struct usb_device *usbdev = priv->usbdev;
633 int rlen;
634 int i;
635
636 if (!usbdev)
637 return 0;
638 if (change_mode(pp, ECR_PPF))
639 return 0;
640 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
641 if (i)
642 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen);
643 change_mode(pp, ECR_PS2);
644 return rlen;
645 }
646
647 /* --------------------------------------------------------------------- */
648
649 static struct parport_operations parport_uss720_ops =
650 {
651 .owner = THIS_MODULE,
652 .write_data = parport_uss720_write_data,
653 .read_data = parport_uss720_read_data,
654
655 .write_control = parport_uss720_write_control,
656 .read_control = parport_uss720_read_control,
657 .frob_control = parport_uss720_frob_control,
658
659 .read_status = parport_uss720_read_status,
660
661 .enable_irq = parport_uss720_enable_irq,
662 .disable_irq = parport_uss720_disable_irq,
663
664 .data_forward = parport_uss720_data_forward,
665 .data_reverse = parport_uss720_data_reverse,
666
667 .init_state = parport_uss720_init_state,
668 .save_state = parport_uss720_save_state,
669 .restore_state = parport_uss720_restore_state,
670
671 .epp_write_data = parport_uss720_epp_write_data,
672 .epp_read_data = parport_uss720_epp_read_data,
673 .epp_write_addr = parport_uss720_epp_write_addr,
674 .epp_read_addr = parport_uss720_epp_read_addr,
675
676 .ecp_write_data = parport_uss720_ecp_write_data,
677 .ecp_read_data = parport_uss720_ecp_read_data,
678 .ecp_write_addr = parport_uss720_ecp_write_addr,
679
680 .compat_write_data = parport_uss720_write_compat,
681 .nibble_read_data = parport_ieee1284_read_nibble,
682 .byte_read_data = parport_ieee1284_read_byte,
683 };
684
685 /* --------------------------------------------------------------------- */
686
687 static int uss720_probe(struct usb_interface *intf,
688 const struct usb_device_id *id)
689 {
690 struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
691 struct usb_host_interface *interface;
692 struct usb_endpoint_descriptor *epd;
693 struct parport_uss720_private *priv;
694 struct parport *pp;
695 unsigned char reg;
696 int i;
697
698 dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n",
699 le16_to_cpu(usbdev->descriptor.idVendor),
700 le16_to_cpu(usbdev->descriptor.idProduct));
701
702 /* our known interfaces have 3 alternate settings */
703 if (intf->num_altsetting != 3) {
704 usb_put_dev(usbdev);
705 return -ENODEV;
706 }
707 i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
708 dev_dbg(&intf->dev, "set interface result %d\n", i);
709
710 interface = intf->cur_altsetting;
711
712 if (interface->desc.bNumEndpoints < 3) {
713 usb_put_dev(usbdev);
714 return -ENODEV;
715 }
716
717 /*
718 * Allocate parport interface
719 */
720 priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL);
721 if (!priv) {
722 usb_put_dev(usbdev);
723 return -ENOMEM;
724 }
725 priv->pp = NULL;
726 priv->usbdev = usbdev;
727 kref_init(&priv->ref_count);
728 spin_lock_init(&priv->asynclock);
729 INIT_LIST_HEAD(&priv->asynclist);
730 pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops);
731 if (!pp) {
732 printk(KERN_WARNING "uss720: could not register parport\n");
733 goto probe_abort;
734 }
735
736 priv->pp = pp;
737 pp->private_data = priv;
738 pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
739
740 /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
741 set_1284_register(pp, 7, 0x00, GFP_KERNEL);
742 set_1284_register(pp, 6, 0x30, GFP_KERNEL); /* PS/2 mode */
743 set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
744 /* debugging */
745 get_1284_register(pp, 0, &reg, GFP_KERNEL);
746 dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg);
747
748 i = usb_find_last_int_in_endpoint(interface, &epd);
749 if (!i) {
750 dev_dbg(&intf->dev, "epaddr %d interval %d\n",
751 epd->bEndpointAddress, epd->bInterval);
752 }
753 parport_announce_port(pp);
754
755 usb_set_intfdata(intf, pp);
756 return 0;
757
758 probe_abort:
759 kill_all_async_requests_priv(priv);
760 kref_put(&priv->ref_count, destroy_priv);
761 return -ENODEV;
762 }
763
764 static void uss720_disconnect(struct usb_interface *intf)
765 {
766 struct parport *pp = usb_get_intfdata(intf);
767 struct parport_uss720_private *priv;
768 struct usb_device *usbdev;
769
770 dev_dbg(&intf->dev, "disconnect\n");
771 usb_set_intfdata(intf, NULL);
772 if (pp) {
773 priv = pp->private_data;
774 usbdev = priv->usbdev;
775 priv->usbdev = NULL;
776 priv->pp = NULL;
777 dev_dbg(&intf->dev, "parport_remove_port\n");
778 parport_remove_port(pp);
779 parport_put_port(pp);
780 kill_all_async_requests_priv(priv);
781 kref_put(&priv->ref_count, destroy_priv);
782 }
783 dev_dbg(&intf->dev, "disconnect done\n");
784 }
785
786 /* table of cables that work through this driver */
787 static const struct usb_device_id uss720_table[] = {
788 { USB_DEVICE(0x047e, 0x1001) },
789 { USB_DEVICE(0x0557, 0x2001) },
790 { USB_DEVICE(0x0729, 0x1284) },
791 { USB_DEVICE(0x1293, 0x0002) },
792 { USB_DEVICE(0x050d, 0x0002) },
793 { } /* Terminating entry */
794 };
795
796 MODULE_DEVICE_TABLE (usb, uss720_table);
797
798
799 static struct usb_driver uss720_driver = {
800 .name = "uss720",
801 .probe = uss720_probe,
802 .disconnect = uss720_disconnect,
803 .id_table = uss720_table,
804 };
805
806 /* --------------------------------------------------------------------- */
807
808 MODULE_AUTHOR(DRIVER_AUTHOR);
809 MODULE_DESCRIPTION(DRIVER_DESC);
810 MODULE_LICENSE("GPL");
811
812 static int __init uss720_init(void)
813 {
814 int retval;
815 retval = usb_register(&uss720_driver);
816 if (retval)
817 goto out;
818
819 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
820 DRIVER_DESC "\n");
821 printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose "
822 "driver to allow nonstandard\n");
823 printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over "
824 "USS720 usb to parallel cables\n");
825 printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a "
826 "printer, use usblp instead\n");
827 out:
828 return retval;
829 }
830
831 static void __exit uss720_cleanup(void)
832 {
833 usb_deregister(&uss720_driver);
834 }
835
836 module_init(uss720_init);
837 module_exit(uss720_cleanup);
838
839 /* --------------------------------------------------------------------- */
Linux with added FPC-III support