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1// SPDX-License-Identifier: GPL-2.0+
2/*****************************************************************************/
3
4/*
5 * uss720.c -- USS720 USB Parport Cable.
6 *
7 * Copyright (C) 1999, 2005, 2010
8 * Thomas Sailer ([email protected])
9 *
10 * Based on parport_pc.c
11 *
12 * History:
13 * 0.1 04.08.1999 Created
14 * 0.2 07.08.1999 Some fixes mainly suggested by Tim Waugh
15 * Interrupt handling currently disabled because
16 * usb_request_irq crashes somewhere within ohci.c
17 * for no apparent reason (that is for me, anyway)
18 * ECP currently untested
19 * 0.3 10.08.1999 fixing merge errors
20 * 0.4 13.08.1999 Added Vendor/Product ID of Brad Hard's cable
21 * 0.5 20.09.1999 usb_control_msg wrapper used
22 * Nov01.2000 usb_device_table support by Adam J. Richter
23 * 08.04.2001 Identify version on module load. gb
24 * 0.6 02.09.2005 Fix "scheduling in interrupt" problem by making save/restore
25 * context asynchronous
26 *
27 */
28
29/*****************************************************************************/
30
31#include <linux/module.h>
32#include <linux/socket.h>
33#include <linux/parport.h>
34#include <linux/init.h>
35#include <linux/usb.h>
36#include <linux/delay.h>
37#include <linux/completion.h>
38#include <linux/kref.h>
39#include <linux/slab.h>
40#include <linux/sched/signal.h>
41
42#define DRIVER_AUTHOR "Thomas M. Sailer, [email protected]"
43#define DRIVER_DESC "USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip"
44
45/* --------------------------------------------------------------------- */
46
47struct parport_uss720_private {
48 struct usb_device *usbdev;
49 struct parport *pp;
50 struct kref ref_count;
51 __u8 reg[7]; /* USB registers */
52 struct list_head asynclist;
53 spinlock_t asynclock;
54};
55
56struct uss720_async_request {
57 struct parport_uss720_private *priv;
58 struct kref ref_count;
59 struct list_head asynclist;
60 struct completion compl;
61 struct urb *urb;
62 struct usb_ctrlrequest *dr;
63 __u8 reg[7];
64};
65
66/* --------------------------------------------------------------------- */
67
68static void destroy_priv(struct kref *kref)
69{
70 struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count);
71
72 dev_dbg(&priv->usbdev->dev, "destroying priv datastructure\n");
73 usb_put_dev(priv->usbdev);
74 priv->usbdev = NULL;
75 kfree(priv);
76}
77
78static void destroy_async(struct kref *kref)
79{
80 struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count);
81 struct parport_uss720_private *priv = rq->priv;
82 unsigned long flags;
83
84 if (likely(rq->urb))
85 usb_free_urb(rq->urb);
86 kfree(rq->dr);
87 spin_lock_irqsave(&priv->asynclock, flags);
88 list_del_init(&rq->asynclist);
89 spin_unlock_irqrestore(&priv->asynclock, flags);
90 kfree(rq);
91 kref_put(&priv->ref_count, destroy_priv);
92}
93
94/* --------------------------------------------------------------------- */
95
96static void async_complete(struct urb *urb)
97{
98 struct uss720_async_request *rq;
99 struct parport *pp;
100 struct parport_uss720_private *priv;
101 int status = urb->status;
102
103 rq = urb->context;
104 priv = rq->priv;
105 pp = priv->pp;
106 if (status) {
107 dev_err(&urb->dev->dev, "async_complete: urb error %d\n",
108 status);
109 } else if (rq->dr->bRequest == 3) {
110 memcpy(priv->reg, rq->reg, sizeof(priv->reg));
111#if 0
112 dev_dbg(&priv->usbdev->dev, "async_complete regs %7ph\n",
113 priv->reg);
114#endif
115 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
116 if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
117 parport_generic_irq(pp);
118 }
119 complete(&rq->compl);
120 kref_put(&rq->ref_count, destroy_async);
121}
122
123static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
124 __u8 request, __u8 requesttype, __u16 value, __u16 index,
125 gfp_t mem_flags)
126{
127 struct usb_device *usbdev;
128 struct uss720_async_request *rq;
129 unsigned long flags;
130 int ret;
131
132 if (!priv)
133 return NULL;
134 usbdev = priv->usbdev;
135 if (!usbdev)
136 return NULL;
137 rq = kzalloc_obj(struct uss720_async_request, mem_flags);
138 if (!rq)
139 return NULL;
140 kref_init(&rq->ref_count);
141 INIT_LIST_HEAD(&rq->asynclist);
142 init_completion(&rq->compl);
143 kref_get(&priv->ref_count);
144 rq->priv = priv;
145 rq->urb = usb_alloc_urb(0, mem_flags);
146 if (!rq->urb) {
147 kref_put(&rq->ref_count, destroy_async);
148 return NULL;
149 }
150 rq->dr = kmalloc_obj(*rq->dr, mem_flags);
151 if (!rq->dr) {
152 kref_put(&rq->ref_count, destroy_async);
153 return NULL;
154 }
155 rq->dr->bRequestType = requesttype;
156 rq->dr->bRequest = request;
157 rq->dr->wValue = cpu_to_le16(value);
158 rq->dr->wIndex = cpu_to_le16(index);
159 rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
160 usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
161 (unsigned char *)rq->dr,
162 (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
163 /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
164 spin_lock_irqsave(&priv->asynclock, flags);
165 list_add_tail(&rq->asynclist, &priv->asynclist);
166 spin_unlock_irqrestore(&priv->asynclock, flags);
167 kref_get(&rq->ref_count);
168 ret = usb_submit_urb(rq->urb, mem_flags);
169 if (!ret)
170 return rq;
171 destroy_async(&rq->ref_count);
172 dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
173 return NULL;
174}
175
176static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
177{
178 struct uss720_async_request *rq;
179 unsigned long flags;
180 unsigned int ret = 0;
181
182 spin_lock_irqsave(&priv->asynclock, flags);
183 list_for_each_entry(rq, &priv->asynclist, asynclist) {
184 usb_unlink_urb(rq->urb);
185 ret++;
186 }
187 spin_unlock_irqrestore(&priv->asynclock, flags);
188 return ret;
189}
190
191/* --------------------------------------------------------------------- */
192
193static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
194{
195 struct parport_uss720_private *priv;
196 struct uss720_async_request *rq;
197 static const unsigned char regindex[9] = {
198 4, 0, 1, 5, 5, 0, 2, 3, 6
199 };
200 int ret;
201
202 if (!pp)
203 return -EIO;
204 priv = pp->private_data;
205 rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
206 if (!rq) {
207 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
208 (unsigned int)reg);
209 return -EIO;
210 }
211 if (!val) {
212 kref_put(&rq->ref_count, destroy_async);
213 return 0;
214 }
215 if (wait_for_completion_timeout(&rq->compl, HZ)) {
216 ret = rq->urb->status;
217 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
218 if (ret)
219 printk(KERN_WARNING "get_1284_register: "
220 "usb error %d\n", ret);
221 kref_put(&rq->ref_count, destroy_async);
222 return ret;
223 }
224 printk(KERN_WARNING "get_1284_register timeout\n");
225 kill_all_async_requests_priv(priv);
226 kref_put(&rq->ref_count, destroy_async);
227 return -EIO;
228}
229
230static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
231{
232 struct parport_uss720_private *priv;
233 struct uss720_async_request *rq;
234
235 if (!pp)
236 return -EIO;
237 priv = pp->private_data;
238 rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
239 if (!rq) {
240 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
241 (unsigned int)reg, (unsigned int)val);
242 return -EIO;
243 }
244 kref_put(&rq->ref_count, destroy_async);
245 return 0;
246}
247
248/* --------------------------------------------------------------------- */
249
250/* ECR modes */
251#define ECR_SPP 00
252#define ECR_PS2 01
253#define ECR_PPF 02
254#define ECR_ECP 03
255#define ECR_EPP 04
256
257/* Safely change the mode bits in the ECR */
258static int change_mode(struct parport *pp, int m)
259{
260 struct parport_uss720_private *priv = pp->private_data;
261 int mode;
262 __u8 reg;
263
264 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
265 return -EIO;
266 /* Bits <7:5> contain the mode. */
267 mode = (priv->reg[2] >> 5) & 0x7;
268 if (mode == m)
269 return 0;
270 /* We have to go through mode 000 or 001 */
271 if (mode > ECR_PS2 && m > ECR_PS2)
272 if (change_mode(pp, ECR_PS2))
273 return -EIO;
274
275 if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
276 /* This mode resets the FIFO, so we may
277 * have to wait for it to drain first. */
278 unsigned long expire = jiffies + pp->physport->cad->timeout;
279 switch (mode) {
280 case ECR_PPF: /* Parallel Port FIFO mode */
281 case ECR_ECP: /* ECP Parallel Port mode */
282 /* Poll slowly. */
283 for (;;) {
284 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
285 return -EIO;
286 if (priv->reg[2] & 0x01)
287 break;
288 if (time_after_eq (jiffies, expire))
289 /* The FIFO is stuck. */
290 return -EBUSY;
291 msleep_interruptible(10);
292 if (signal_pending (current))
293 break;
294 }
295 }
296 }
297 /* Set the mode. */
298 if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
299 return -EIO;
300 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
301 return -EIO;
302 return 0;
303}
304
305/*
306 * Clear TIMEOUT BIT in EPP MODE
307 */
308static int clear_epp_timeout(struct parport *pp)
309{
310 unsigned char stat;
311
312 if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
313 return 1;
314 return stat & 1;
315}
316
317/*
318 * Access functions.
319 */
320#if 0
321static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
322{
323 struct parport *pp = (struct parport *)dev_id;
324 struct parport_uss720_private *priv = pp->private_data;
325
326 if (usbstatus != 0 || len < 4 || !buffer)
327 return 1;
328 memcpy(priv->reg, buffer, 4);
329 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
330 if (priv->reg[2] & priv->reg[1] & 0x10)
331 parport_generic_irq(pp);
332 return 1;
333}
334#endif
335
336static void parport_uss720_write_data(struct parport *pp, unsigned char d)
337{
338 set_1284_register(pp, 0, d, GFP_KERNEL);
339}
340
341static unsigned char parport_uss720_read_data(struct parport *pp)
342{
343 unsigned char ret;
344
345 if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
346 return 0;
347 return ret;
348}
349
350static void parport_uss720_write_control(struct parport *pp, unsigned char d)
351{
352 struct parport_uss720_private *priv = pp->private_data;
353
354 d = (d & 0xf) | (priv->reg[1] & 0xf0);
355 if (set_1284_register(pp, 2, d, GFP_KERNEL))
356 return;
357 priv->reg[1] = d;
358}
359
360static unsigned char parport_uss720_read_control(struct parport *pp)
361{
362 struct parport_uss720_private *priv = pp->private_data;
363 return priv->reg[1] & 0xf; /* Use soft copy */
364}
365
366static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
367{
368 struct parport_uss720_private *priv = pp->private_data;
369 unsigned char d;
370
371 mask &= 0x0f;
372 val &= 0x0f;
373 d = (priv->reg[1] & (~mask)) ^ val;
374 if (set_1284_register(pp, 2, d, GFP_ATOMIC))
375 return 0;
376 priv->reg[1] = d;
377 return d & 0xf;
378}
379
380static unsigned char parport_uss720_read_status(struct parport *pp)
381{
382 unsigned char ret;
383
384 if (get_1284_register(pp, 1, &ret, GFP_ATOMIC))
385 return 0;
386 return ret & 0xf8;
387}
388
389static void parport_uss720_disable_irq(struct parport *pp)
390{
391 struct parport_uss720_private *priv = pp->private_data;
392 unsigned char d;
393
394 d = priv->reg[1] & ~0x10;
395 if (set_1284_register(pp, 2, d, GFP_KERNEL))
396 return;
397 priv->reg[1] = d;
398}
399
400static void parport_uss720_enable_irq(struct parport *pp)
401{
402 struct parport_uss720_private *priv = pp->private_data;
403 unsigned char d;
404
405 d = priv->reg[1] | 0x10;
406 if (set_1284_register(pp, 2, d, GFP_KERNEL))
407 return;
408 priv->reg[1] = d;
409}
410
411static void parport_uss720_data_forward (struct parport *pp)
412{
413 struct parport_uss720_private *priv = pp->private_data;
414 unsigned char d;
415
416 d = priv->reg[1] & ~0x20;
417 if (set_1284_register(pp, 2, d, GFP_KERNEL))
418 return;
419 priv->reg[1] = d;
420}
421
422static void parport_uss720_data_reverse (struct parport *pp)
423{
424 struct parport_uss720_private *priv = pp->private_data;
425 unsigned char d;
426
427 d = priv->reg[1] | 0x20;
428 if (set_1284_register(pp, 2, d, GFP_KERNEL))
429 return;
430 priv->reg[1] = d;
431}
432
433static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
434{
435 s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
436 s->u.pc.ecr = 0x24;
437}
438
439static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
440{
441 struct parport_uss720_private *priv = pp->private_data;
442
443#if 0
444 if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
445 return;
446#endif
447 s->u.pc.ctr = priv->reg[1];
448 s->u.pc.ecr = priv->reg[2];
449}
450
451static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
452{
453 struct parport_uss720_private *priv = pp->private_data;
454
455 set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
456 set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
457 get_1284_register(pp, 2, NULL, GFP_ATOMIC);
458 priv->reg[1] = s->u.pc.ctr;
459 priv->reg[2] = s->u.pc.ecr;
460}
461
462static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
463{
464 struct parport_uss720_private *priv = pp->private_data;
465 size_t got = 0;
466
467 if (change_mode(pp, ECR_EPP))
468 return 0;
469 for (; got < length; got++) {
470 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
471 break;
472 buf++;
473 if (priv->reg[0] & 0x01) {
474 clear_epp_timeout(pp);
475 break;
476 }
477 }
478 change_mode(pp, ECR_PS2);
479 return got;
480}
481
482static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
483{
484#if 0
485 struct parport_uss720_private *priv = pp->private_data;
486 size_t written = 0;
487
488 if (change_mode(pp, ECR_EPP))
489 return 0;
490 for (; written < length; written++) {
491 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
492 break;
493 ((char*)buf)++;
494 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
495 break;
496 if (priv->reg[0] & 0x01) {
497 clear_epp_timeout(pp);
498 break;
499 }
500 }
501 change_mode(pp, ECR_PS2);
502 return written;
503#else
504 struct parport_uss720_private *priv = pp->private_data;
505 struct usb_device *usbdev = priv->usbdev;
506 int rlen = 0;
507 int i;
508
509 if (!usbdev)
510 return 0;
511 if (change_mode(pp, ECR_EPP))
512 return 0;
513 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
514 if (i)
515 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buf, length, rlen);
516 change_mode(pp, ECR_PS2);
517 return rlen;
518#endif
519}
520
521static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
522{
523 struct parport_uss720_private *priv = pp->private_data;
524 size_t got = 0;
525
526 if (change_mode(pp, ECR_EPP))
527 return 0;
528 for (; got < length; got++) {
529 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
530 break;
531 buf++;
532 if (priv->reg[0] & 0x01) {
533 clear_epp_timeout(pp);
534 break;
535 }
536 }
537 change_mode(pp, ECR_PS2);
538 return got;
539}
540
541static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
542{
543 struct parport_uss720_private *priv = pp->private_data;
544 size_t written = 0;
545
546 if (change_mode(pp, ECR_EPP))
547 return 0;
548 for (; written < length; written++) {
549 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
550 break;
551 buf++;
552 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
553 break;
554 if (priv->reg[0] & 0x01) {
555 clear_epp_timeout(pp);
556 break;
557 }
558 }
559 change_mode(pp, ECR_PS2);
560 return written;
561}
562
563static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
564{
565 struct parport_uss720_private *priv = pp->private_data;
566 struct usb_device *usbdev = priv->usbdev;
567 int rlen = 0;
568 int i;
569
570 if (!usbdev)
571 return 0;
572 if (change_mode(pp, ECR_ECP))
573 return 0;
574 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
575 if (i)
576 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen);
577 change_mode(pp, ECR_PS2);
578 return rlen;
579}
580
581static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
582{
583 struct parport_uss720_private *priv = pp->private_data;
584 struct usb_device *usbdev = priv->usbdev;
585 int rlen = 0;
586 int i;
587
588 if (!usbdev)
589 return 0;
590 if (change_mode(pp, ECR_ECP))
591 return 0;
592 i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
593 if (i)
594 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %zu rlen %u\n", buffer, len, rlen);
595 change_mode(pp, ECR_PS2);
596 return rlen;
597}
598
599static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
600{
601 size_t written = 0;
602
603 if (change_mode(pp, ECR_ECP))
604 return 0;
605 for (; written < len; written++) {
606 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
607 break;
608 buffer++;
609 }
610 change_mode(pp, ECR_PS2);
611 return written;
612}
613
614static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
615{
616 struct parport_uss720_private *priv = pp->private_data;
617 struct usb_device *usbdev = priv->usbdev;
618 int rlen = 0;
619 int i;
620
621 if (!usbdev)
622 return 0;
623 if (change_mode(pp, ECR_PPF))
624 return 0;
625 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
626 if (i)
627 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen);
628 change_mode(pp, ECR_PS2);
629 return rlen;
630}
631
632/* --------------------------------------------------------------------- */
633
634static struct parport_operations parport_uss720_ops =
635{
636 .owner = THIS_MODULE,
637 .write_data = parport_uss720_write_data,
638 .read_data = parport_uss720_read_data,
639
640 .write_control = parport_uss720_write_control,
641 .read_control = parport_uss720_read_control,
642 .frob_control = parport_uss720_frob_control,
643
644 .read_status = parport_uss720_read_status,
645
646 .enable_irq = parport_uss720_enable_irq,
647 .disable_irq = parport_uss720_disable_irq,
648
649 .data_forward = parport_uss720_data_forward,
650 .data_reverse = parport_uss720_data_reverse,
651
652 .init_state = parport_uss720_init_state,
653 .save_state = parport_uss720_save_state,
654 .restore_state = parport_uss720_restore_state,
655
656 .epp_write_data = parport_uss720_epp_write_data,
657 .epp_read_data = parport_uss720_epp_read_data,
658 .epp_write_addr = parport_uss720_epp_write_addr,
659 .epp_read_addr = parport_uss720_epp_read_addr,
660
661 .ecp_write_data = parport_uss720_ecp_write_data,
662 .ecp_read_data = parport_uss720_ecp_read_data,
663 .ecp_write_addr = parport_uss720_ecp_write_addr,
664
665 .compat_write_data = parport_uss720_write_compat,
666 .nibble_read_data = parport_ieee1284_read_nibble,
667 .byte_read_data = parport_ieee1284_read_byte,
668};
669
670/* --------------------------------------------------------------------- */
671
672static int uss720_probe(struct usb_interface *intf,
673 const struct usb_device_id *id)
674{
675 struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
676 struct usb_host_interface *interface;
677 struct usb_endpoint_descriptor *epd;
678 struct parport_uss720_private *priv;
679 struct parport *pp;
680 unsigned char reg;
681 int ret = -ENODEV;
682
683 dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n",
684 le16_to_cpu(usbdev->descriptor.idVendor),
685 le16_to_cpu(usbdev->descriptor.idProduct));
686
687 /* our known interfaces have 3 alternate settings */
688 if (intf->num_altsetting != 3)
689 goto bail_out_early;
690
691 ret = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
692 dev_dbg(&intf->dev, "set interface result %d\n", ret);
693
694 interface = intf->cur_altsetting;
695
696 if (interface->desc.bNumEndpoints < 2)
697 goto bail_out_early;
698
699 /*
700 * Allocate parport interface
701 */
702 ret = -ENOMEM;
703 priv = kzalloc_obj(struct parport_uss720_private);
704 if (!priv)
705 goto bail_out_early;
706
707 priv->pp = NULL;
708 priv->usbdev = usbdev;
709 kref_init(&priv->ref_count);
710 spin_lock_init(&priv->asynclock);
711 INIT_LIST_HEAD(&priv->asynclist);
712 pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops);
713 if (!pp) {
714 printk(KERN_WARNING "uss720: could not register parport\n");
715 goto probe_abort;
716 }
717
718 priv->pp = pp;
719 pp->private_data = priv;
720 pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_COMPAT;
721 if (interface->desc.bNumEndpoints >= 3)
722 pp->modes |= PARPORT_MODE_ECP;
723 pp->dev = &usbdev->dev;
724
725 /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
726 set_1284_register(pp, 7, 0x00, GFP_KERNEL);
727 set_1284_register(pp, 6, 0x30, GFP_KERNEL); /* PS/2 mode */
728 set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
729
730 /* The Belkin F5U002 Rev 2 P80453-B USB parallel port adapter shares the
731 * device ID 050d:0002 with some other device that works with this
732 * driver, but it itself does not. Detect and handle the bad cable
733 * here. */
734 ret = get_1284_register(pp, 0, &reg, GFP_KERNEL);
735 dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg);
736 if (ret < 0) {
737 priv->pp = NULL;
738 parport_del_port(pp);
739 goto probe_abort;
740 }
741
742 ret = usb_find_last_int_in_endpoint(interface, &epd);
743 if (!ret) {
744 dev_dbg(&intf->dev, "epaddr %d interval %d\n",
745 epd->bEndpointAddress, epd->bInterval);
746 }
747 parport_announce_port(pp);
748
749 usb_set_intfdata(intf, pp);
750 return 0;
751
752probe_abort:
753 kill_all_async_requests_priv(priv);
754 kref_put(&priv->ref_count, destroy_priv);
755 return -ENODEV;
756
757bail_out_early:
758 usb_put_dev(usbdev);
759 return ret;
760}
761
762static void uss720_disconnect(struct usb_interface *intf)
763{
764 struct parport *pp = usb_get_intfdata(intf);
765 struct parport_uss720_private *priv;
766
767 dev_dbg(&intf->dev, "disconnect\n");
768 usb_set_intfdata(intf, NULL);
769 if (pp) {
770 priv = pp->private_data;
771 priv->pp = NULL;
772 dev_dbg(&intf->dev, "parport_remove_port\n");
773 parport_remove_port(pp);
774 parport_put_port(pp);
775 kill_all_async_requests_priv(priv);
776 kref_put(&priv->ref_count, destroy_priv);
777 }
778 dev_dbg(&intf->dev, "disconnect done\n");
779}
780
781/* table of cables that work through this driver */
782static const struct usb_device_id uss720_table[] = {
783 { USB_DEVICE(0x047e, 0x1001) }, /* Infowave 901-0030 */
784 { USB_DEVICE(0x04b8, 0x0002) }, /* Epson CAEUL0002 ISD-103 */
785 { USB_DEVICE(0x04b8, 0x0003) }, /* Epson ISD-101 */
786 { USB_DEVICE(0x050d, 0x0002) },
787 { USB_DEVICE(0x050d, 0x1202) }, /* Belkin F5U120-PC */
788 { USB_DEVICE(0x0557, 0x2001) },
789 { USB_DEVICE(0x05ab, 0x0002) }, /* Belkin F5U002 ISD-101 */
790 { USB_DEVICE(0x05ab, 0x1001) }, /* Belkin F5U002 P80453-A */
791 { USB_DEVICE(0x06c6, 0x0100) }, /* Infowave ISD-103 */
792 { USB_DEVICE(0x0729, 0x1284) },
793 { USB_DEVICE(0x1293, 0x0002) },
794 { } /* Terminating entry */
795};
796
797MODULE_DEVICE_TABLE (usb, uss720_table);
798
799
800static struct usb_driver uss720_driver = {
801 .name = "uss720",
802 .probe = uss720_probe,
803 .disconnect = uss720_disconnect,
804 .id_table = uss720_table,
805};
806
807/* --------------------------------------------------------------------- */
808
809MODULE_AUTHOR(DRIVER_AUTHOR);
810MODULE_DESCRIPTION(DRIVER_DESC);
811MODULE_LICENSE("GPL");
812
813static int __init uss720_init(void)
814{
815 int retval;
816 retval = usb_register(&uss720_driver);
817 if (retval)
818 goto out;
819
820 printk(KERN_INFO KBUILD_MODNAME ": " 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");
827out:
828 return retval;
829}
830
831static void __exit uss720_cleanup(void)
832{
833 usb_deregister(&uss720_driver);
834}
835
836module_init(uss720_init);
837module_exit(uss720_cleanup);
838
839/* --------------------------------------------------------------------- */