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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 (t.sailer@alumni.ethz.ch)
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, t.sailer@alumni.ethz.ch"
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 kfree(priv);
75}
76
77static void destroy_async(struct kref *kref)
78{
79 struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count);
80 struct parport_uss720_private *priv = rq->priv;
81 unsigned long flags;
82
83 if (likely(rq->urb))
84 usb_free_urb(rq->urb);
85 kfree(rq->dr);
86 spin_lock_irqsave(&priv->asynclock, flags);
87 list_del_init(&rq->asynclist);
88 spin_unlock_irqrestore(&priv->asynclock, flags);
89 kfree(rq);
90 kref_put(&priv->ref_count, destroy_priv);
91}
92
93/* --------------------------------------------------------------------- */
94
95static void async_complete(struct urb *urb)
96{
97 struct uss720_async_request *rq;
98 struct parport *pp;
99 struct parport_uss720_private *priv;
100 int status = urb->status;
101
102 rq = urb->context;
103 priv = rq->priv;
104 pp = priv->pp;
105 if (status) {
106 dev_err(&urb->dev->dev, "async_complete: urb error %d\n",
107 status);
108 } else if (rq->dr->bRequest == 3) {
109 memcpy(priv->reg, rq->reg, sizeof(priv->reg));
110#if 0
111 dev_dbg(&priv->usbdev->dev, "async_complete regs %7ph\n",
112 priv->reg);
113#endif
114 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
115 if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
116 parport_generic_irq(pp);
117 }
118 complete(&rq->compl);
119 kref_put(&rq->ref_count, destroy_async);
120}
121
122static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
123 __u8 request, __u8 requesttype, __u16 value, __u16 index,
124 gfp_t mem_flags)
125{
126 struct usb_device *usbdev;
127 struct uss720_async_request *rq;
128 unsigned long flags;
129 int ret;
130
131 if (!priv)
132 return NULL;
133 usbdev = priv->usbdev;
134 if (!usbdev)
135 return NULL;
136 rq = kzalloc(sizeof(struct uss720_async_request), mem_flags);
137 if (!rq)
138 return NULL;
139 kref_init(&rq->ref_count);
140 INIT_LIST_HEAD(&rq->asynclist);
141 init_completion(&rq->compl);
142 kref_get(&priv->ref_count);
143 rq->priv = priv;
144 rq->urb = usb_alloc_urb(0, mem_flags);
145 if (!rq->urb) {
146 kref_put(&rq->ref_count, destroy_async);
147 return NULL;
148 }
149 rq->dr = kmalloc(sizeof(*rq->dr), mem_flags);
150 if (!rq->dr) {
151 kref_put(&rq->ref_count, destroy_async);
152 return NULL;
153 }
154 rq->dr->bRequestType = requesttype;
155 rq->dr->bRequest = request;
156 rq->dr->wValue = cpu_to_le16(value);
157 rq->dr->wIndex = cpu_to_le16(index);
158 rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
159 usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
160 (unsigned char *)rq->dr,
161 (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
162 /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
163 spin_lock_irqsave(&priv->asynclock, flags);
164 list_add_tail(&rq->asynclist, &priv->asynclist);
165 spin_unlock_irqrestore(&priv->asynclock, flags);
166 kref_get(&rq->ref_count);
167 ret = usb_submit_urb(rq->urb, mem_flags);
168 if (!ret)
169 return rq;
170 destroy_async(&rq->ref_count);
171 dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
172 return NULL;
173}
174
175static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
176{
177 struct uss720_async_request *rq;
178 unsigned long flags;
179 unsigned int ret = 0;
180
181 spin_lock_irqsave(&priv->asynclock, flags);
182 list_for_each_entry(rq, &priv->asynclist, asynclist) {
183 usb_unlink_urb(rq->urb);
184 ret++;
185 }
186 spin_unlock_irqrestore(&priv->asynclock, flags);
187 return ret;
188}
189
190/* --------------------------------------------------------------------- */
191
192static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
193{
194 struct parport_uss720_private *priv;
195 struct uss720_async_request *rq;
196 static const unsigned char regindex[9] = {
197 4, 0, 1, 5, 5, 0, 2, 3, 6
198 };
199 int ret;
200
201 if (!pp)
202 return -EIO;
203 priv = pp->private_data;
204 rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
205 if (!rq) {
206 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
207 (unsigned int)reg);
208 return -EIO;
209 }
210 if (!val) {
211 kref_put(&rq->ref_count, destroy_async);
212 return 0;
213 }
214 if (wait_for_completion_timeout(&rq->compl, HZ)) {
215 ret = rq->urb->status;
216 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
217 if (ret)
218 printk(KERN_WARNING "get_1284_register: "
219 "usb error %d\n", ret);
220 kref_put(&rq->ref_count, destroy_async);
221 return ret;
222 }
223 printk(KERN_WARNING "get_1284_register timeout\n");
224 kill_all_async_requests_priv(priv);
225 return -EIO;
226}
227
228static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
229{
230 struct parport_uss720_private *priv;
231 struct uss720_async_request *rq;
232
233 if (!pp)
234 return -EIO;
235 priv = pp->private_data;
236 rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
237 if (!rq) {
238 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
239 (unsigned int)reg, (unsigned int)val);
240 return -EIO;
241 }
242 kref_put(&rq->ref_count, destroy_async);
243 return 0;
244}
245
246/* --------------------------------------------------------------------- */
247
248/* ECR modes */
249#define ECR_SPP 00
250#define ECR_PS2 01
251#define ECR_PPF 02
252#define ECR_ECP 03
253#define ECR_EPP 04
254
255/* Safely change the mode bits in the ECR */
256static int change_mode(struct parport *pp, int m)
257{
258 struct parport_uss720_private *priv = pp->private_data;
259 int mode;
260 __u8 reg;
261
262 if (get_1284_register(pp, 6, ®, GFP_KERNEL))
263 return -EIO;
264 /* Bits <7:5> contain the mode. */
265 mode = (priv->reg[2] >> 5) & 0x7;
266 if (mode == m)
267 return 0;
268 /* We have to go through mode 000 or 001 */
269 if (mode > ECR_PS2 && m > ECR_PS2)
270 if (change_mode(pp, ECR_PS2))
271 return -EIO;
272
273 if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
274 /* This mode resets the FIFO, so we may
275 * have to wait for it to drain first. */
276 unsigned long expire = jiffies + pp->physport->cad->timeout;
277 switch (mode) {
278 case ECR_PPF: /* Parallel Port FIFO mode */
279 case ECR_ECP: /* ECP Parallel Port mode */
280 /* Poll slowly. */
281 for (;;) {
282 if (get_1284_register(pp, 6, ®, GFP_KERNEL))
283 return -EIO;
284 if (priv->reg[2] & 0x01)
285 break;
286 if (time_after_eq (jiffies, expire))
287 /* The FIFO is stuck. */
288 return -EBUSY;
289 msleep_interruptible(10);
290 if (signal_pending (current))
291 break;
292 }
293 }
294 }
295 /* Set the mode. */
296 if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
297 return -EIO;
298 if (get_1284_register(pp, 6, ®, GFP_KERNEL))
299 return -EIO;
300 return 0;
301}
302
303/*
304 * Clear TIMEOUT BIT in EPP MODE
305 */
306static int clear_epp_timeout(struct parport *pp)
307{
308 unsigned char stat;
309
310 if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
311 return 1;
312 return stat & 1;
313}
314
315/*
316 * Access functions.
317 */
318#if 0
319static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
320{
321 struct parport *pp = (struct parport *)dev_id;
322 struct parport_uss720_private *priv = pp->private_data;
323
324 if (usbstatus != 0 || len < 4 || !buffer)
325 return 1;
326 memcpy(priv->reg, buffer, 4);
327 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
328 if (priv->reg[2] & priv->reg[1] & 0x10)
329 parport_generic_irq(pp);
330 return 1;
331}
332#endif
333
334static void parport_uss720_write_data(struct parport *pp, unsigned char d)
335{
336 set_1284_register(pp, 0, d, GFP_KERNEL);
337}
338
339static unsigned char parport_uss720_read_data(struct parport *pp)
340{
341 unsigned char ret;
342
343 if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
344 return 0;
345 return ret;
346}
347
348static void parport_uss720_write_control(struct parport *pp, unsigned char d)
349{
350 struct parport_uss720_private *priv = pp->private_data;
351
352 d = (d & 0xf) | (priv->reg[1] & 0xf0);
353 if (set_1284_register(pp, 2, d, GFP_KERNEL))
354 return;
355 priv->reg[1] = d;
356}
357
358static unsigned char parport_uss720_read_control(struct parport *pp)
359{
360 struct parport_uss720_private *priv = pp->private_data;
361 return priv->reg[1] & 0xf; /* Use soft copy */
362}
363
364static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
365{
366 struct parport_uss720_private *priv = pp->private_data;
367 unsigned char d;
368
369 mask &= 0x0f;
370 val &= 0x0f;
371 d = (priv->reg[1] & (~mask)) ^ val;
372 if (set_1284_register(pp, 2, d, GFP_ATOMIC))
373 return 0;
374 priv->reg[1] = d;
375 return d & 0xf;
376}
377
378static unsigned char parport_uss720_read_status(struct parport *pp)
379{
380 unsigned char ret;
381
382 if (get_1284_register(pp, 1, &ret, GFP_ATOMIC))
383 return 0;
384 return ret & 0xf8;
385}
386
387static void parport_uss720_disable_irq(struct parport *pp)
388{
389 struct parport_uss720_private *priv = pp->private_data;
390 unsigned char d;
391
392 d = priv->reg[1] & ~0x10;
393 if (set_1284_register(pp, 2, d, GFP_KERNEL))
394 return;
395 priv->reg[1] = d;
396}
397
398static void parport_uss720_enable_irq(struct parport *pp)
399{
400 struct parport_uss720_private *priv = pp->private_data;
401 unsigned char d;
402
403 d = priv->reg[1] | 0x10;
404 if (set_1284_register(pp, 2, d, GFP_KERNEL))
405 return;
406 priv->reg[1] = d;
407}
408
409static void parport_uss720_data_forward (struct parport *pp)
410{
411 struct parport_uss720_private *priv = pp->private_data;
412 unsigned char d;
413
414 d = priv->reg[1] & ~0x20;
415 if (set_1284_register(pp, 2, d, GFP_KERNEL))
416 return;
417 priv->reg[1] = d;
418}
419
420static void parport_uss720_data_reverse (struct parport *pp)
421{
422 struct parport_uss720_private *priv = pp->private_data;
423 unsigned char d;
424
425 d = priv->reg[1] | 0x20;
426 if (set_1284_register(pp, 2, d, GFP_KERNEL))
427 return;
428 priv->reg[1] = d;
429}
430
431static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
432{
433 s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
434 s->u.pc.ecr = 0x24;
435}
436
437static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
438{
439 struct parport_uss720_private *priv = pp->private_data;
440
441#if 0
442 if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
443 return;
444#endif
445 s->u.pc.ctr = priv->reg[1];
446 s->u.pc.ecr = priv->reg[2];
447}
448
449static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
450{
451 struct parport_uss720_private *priv = pp->private_data;
452
453 set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
454 set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
455 get_1284_register(pp, 2, NULL, GFP_ATOMIC);
456 priv->reg[1] = s->u.pc.ctr;
457 priv->reg[2] = s->u.pc.ecr;
458}
459
460static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
461{
462 struct parport_uss720_private *priv = pp->private_data;
463 size_t got = 0;
464
465 if (change_mode(pp, ECR_EPP))
466 return 0;
467 for (; got < length; got++) {
468 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
469 break;
470 buf++;
471 if (priv->reg[0] & 0x01) {
472 clear_epp_timeout(pp);
473 break;
474 }
475 }
476 change_mode(pp, ECR_PS2);
477 return got;
478}
479
480static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
481{
482#if 0
483 struct parport_uss720_private *priv = pp->private_data;
484 size_t written = 0;
485
486 if (change_mode(pp, ECR_EPP))
487 return 0;
488 for (; written < length; written++) {
489 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
490 break;
491 ((char*)buf)++;
492 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
493 break;
494 if (priv->reg[0] & 0x01) {
495 clear_epp_timeout(pp);
496 break;
497 }
498 }
499 change_mode(pp, ECR_PS2);
500 return written;
501#else
502 struct parport_uss720_private *priv = pp->private_data;
503 struct usb_device *usbdev = priv->usbdev;
504 int rlen;
505 int i;
506
507 if (!usbdev)
508 return 0;
509 if (change_mode(pp, ECR_EPP))
510 return 0;
511 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
512 if (i)
513 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buf, length, rlen);
514 change_mode(pp, ECR_PS2);
515 return rlen;
516#endif
517}
518
519static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
520{
521 struct parport_uss720_private *priv = pp->private_data;
522 size_t got = 0;
523
524 if (change_mode(pp, ECR_EPP))
525 return 0;
526 for (; got < length; got++) {
527 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
528 break;
529 buf++;
530 if (priv->reg[0] & 0x01) {
531 clear_epp_timeout(pp);
532 break;
533 }
534 }
535 change_mode(pp, ECR_PS2);
536 return got;
537}
538
539static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
540{
541 struct parport_uss720_private *priv = pp->private_data;
542 size_t written = 0;
543
544 if (change_mode(pp, ECR_EPP))
545 return 0;
546 for (; written < length; written++) {
547 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
548 break;
549 buf++;
550 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
551 break;
552 if (priv->reg[0] & 0x01) {
553 clear_epp_timeout(pp);
554 break;
555 }
556 }
557 change_mode(pp, ECR_PS2);
558 return written;
559}
560
561static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
562{
563 struct parport_uss720_private *priv = pp->private_data;
564 struct usb_device *usbdev = priv->usbdev;
565 int rlen;
566 int i;
567
568 if (!usbdev)
569 return 0;
570 if (change_mode(pp, ECR_ECP))
571 return 0;
572 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
573 if (i)
574 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen);
575 change_mode(pp, ECR_PS2);
576 return rlen;
577}
578
579static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
580{
581 struct parport_uss720_private *priv = pp->private_data;
582 struct usb_device *usbdev = priv->usbdev;
583 int rlen;
584 int i;
585
586 if (!usbdev)
587 return 0;
588 if (change_mode(pp, ECR_ECP))
589 return 0;
590 i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
591 if (i)
592 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %zu rlen %u\n", buffer, len, rlen);
593 change_mode(pp, ECR_PS2);
594 return rlen;
595}
596
597static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
598{
599 size_t written = 0;
600
601 if (change_mode(pp, ECR_ECP))
602 return 0;
603 for (; written < len; written++) {
604 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
605 break;
606 buffer++;
607 }
608 change_mode(pp, ECR_PS2);
609 return written;
610}
611
612static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
613{
614 struct parport_uss720_private *priv = pp->private_data;
615 struct usb_device *usbdev = priv->usbdev;
616 int rlen;
617 int i;
618
619 if (!usbdev)
620 return 0;
621 if (change_mode(pp, ECR_PPF))
622 return 0;
623 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
624 if (i)
625 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen);
626 change_mode(pp, ECR_PS2);
627 return rlen;
628}
629
630/* --------------------------------------------------------------------- */
631
632static struct parport_operations parport_uss720_ops =
633{
634 .owner = THIS_MODULE,
635 .write_data = parport_uss720_write_data,
636 .read_data = parport_uss720_read_data,
637
638 .write_control = parport_uss720_write_control,
639 .read_control = parport_uss720_read_control,
640 .frob_control = parport_uss720_frob_control,
641
642 .read_status = parport_uss720_read_status,
643
644 .enable_irq = parport_uss720_enable_irq,
645 .disable_irq = parport_uss720_disable_irq,
646
647 .data_forward = parport_uss720_data_forward,
648 .data_reverse = parport_uss720_data_reverse,
649
650 .init_state = parport_uss720_init_state,
651 .save_state = parport_uss720_save_state,
652 .restore_state = parport_uss720_restore_state,
653
654 .epp_write_data = parport_uss720_epp_write_data,
655 .epp_read_data = parport_uss720_epp_read_data,
656 .epp_write_addr = parport_uss720_epp_write_addr,
657 .epp_read_addr = parport_uss720_epp_read_addr,
658
659 .ecp_write_data = parport_uss720_ecp_write_data,
660 .ecp_read_data = parport_uss720_ecp_read_data,
661 .ecp_write_addr = parport_uss720_ecp_write_addr,
662
663 .compat_write_data = parport_uss720_write_compat,
664 .nibble_read_data = parport_ieee1284_read_nibble,
665 .byte_read_data = parport_ieee1284_read_byte,
666};
667
668/* --------------------------------------------------------------------- */
669
670static int uss720_probe(struct usb_interface *intf,
671 const struct usb_device_id *id)
672{
673 struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
674 struct usb_host_interface *interface;
675 struct usb_endpoint_descriptor *epd;
676 struct parport_uss720_private *priv;
677 struct parport *pp;
678 unsigned char reg;
679 int i;
680
681 dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n",
682 le16_to_cpu(usbdev->descriptor.idVendor),
683 le16_to_cpu(usbdev->descriptor.idProduct));
684
685 /* our known interfaces have 3 alternate settings */
686 if (intf->num_altsetting != 3) {
687 usb_put_dev(usbdev);
688 return -ENODEV;
689 }
690 i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
691 dev_dbg(&intf->dev, "set interface result %d\n", i);
692
693 interface = intf->cur_altsetting;
694
695 if (interface->desc.bNumEndpoints < 3) {
696 usb_put_dev(usbdev);
697 return -ENODEV;
698 }
699
700 /*
701 * Allocate parport interface
702 */
703 priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL);
704 if (!priv) {
705 usb_put_dev(usbdev);
706 return -ENOMEM;
707 }
708 priv->pp = NULL;
709 priv->usbdev = usbdev;
710 kref_init(&priv->ref_count);
711 spin_lock_init(&priv->asynclock);
712 INIT_LIST_HEAD(&priv->asynclist);
713 pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops);
714 if (!pp) {
715 printk(KERN_WARNING "uss720: could not register parport\n");
716 goto probe_abort;
717 }
718
719 priv->pp = pp;
720 pp->private_data = priv;
721 pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
722
723 /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
724 set_1284_register(pp, 7, 0x00, GFP_KERNEL);
725 set_1284_register(pp, 6, 0x30, GFP_KERNEL); /* PS/2 mode */
726 set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
727 /* debugging */
728 get_1284_register(pp, 0, ®, GFP_KERNEL);
729 dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg);
730
731 i = usb_find_last_int_in_endpoint(interface, &epd);
732 if (!i) {
733 dev_dbg(&intf->dev, "epaddr %d interval %d\n",
734 epd->bEndpointAddress, epd->bInterval);
735 }
736 parport_announce_port(pp);
737
738 usb_set_intfdata(intf, pp);
739 return 0;
740
741probe_abort:
742 kill_all_async_requests_priv(priv);
743 kref_put(&priv->ref_count, destroy_priv);
744 return -ENODEV;
745}
746
747static void uss720_disconnect(struct usb_interface *intf)
748{
749 struct parport *pp = usb_get_intfdata(intf);
750 struct parport_uss720_private *priv;
751
752 dev_dbg(&intf->dev, "disconnect\n");
753 usb_set_intfdata(intf, NULL);
754 if (pp) {
755 priv = pp->private_data;
756 priv->usbdev = NULL;
757 priv->pp = NULL;
758 dev_dbg(&intf->dev, "parport_remove_port\n");
759 parport_remove_port(pp);
760 parport_put_port(pp);
761 kill_all_async_requests_priv(priv);
762 kref_put(&priv->ref_count, destroy_priv);
763 }
764 dev_dbg(&intf->dev, "disconnect done\n");
765}
766
767/* table of cables that work through this driver */
768static const struct usb_device_id uss720_table[] = {
769 { USB_DEVICE(0x047e, 0x1001) },
770 { USB_DEVICE(0x04b8, 0x0002) },
771 { USB_DEVICE(0x04b8, 0x0003) },
772 { USB_DEVICE(0x050d, 0x0002) },
773 { USB_DEVICE(0x050d, 0x1202) },
774 { USB_DEVICE(0x0557, 0x2001) },
775 { USB_DEVICE(0x05ab, 0x0002) },
776 { USB_DEVICE(0x06c6, 0x0100) },
777 { USB_DEVICE(0x0729, 0x1284) },
778 { USB_DEVICE(0x1293, 0x0002) },
779 { } /* Terminating entry */
780};
781
782MODULE_DEVICE_TABLE (usb, uss720_table);
783
784
785static 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
794MODULE_AUTHOR(DRIVER_AUTHOR);
795MODULE_DESCRIPTION(DRIVER_DESC);
796MODULE_LICENSE("GPL");
797
798static 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_DESC "\n");
806 printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose "
807 "driver to allow nonstandard\n");
808 printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over "
809 "USS720 usb to parallel cables\n");
810 printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a "
811 "printer, use usblp instead\n");
812out:
813 return retval;
814}
815
816static void __exit uss720_cleanup(void)
817{
818 usb_deregister(&uss720_driver);
819}
820
821module_init(uss720_init);
822module_exit(uss720_cleanup);
823
824/* --------------------------------------------------------------------- */
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
63struct 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
72struct 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
84static void destroy_priv(struct kref *kref)
85{
86 struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count);
87
88 dev_dbg(&priv->usbdev->dev, "destroying priv datastructure\n");
89 usb_put_dev(priv->usbdev);
90 kfree(priv);
91}
92
93static 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 kfree(rq->dr);
102 spin_lock_irqsave(&priv->asynclock, flags);
103 list_del_init(&rq->asynclist);
104 spin_unlock_irqrestore(&priv->asynclock, flags);
105 kfree(rq);
106 kref_put(&priv->ref_count, destroy_priv);
107}
108
109/* --------------------------------------------------------------------- */
110
111static void async_complete(struct urb *urb)
112{
113 struct uss720_async_request *rq;
114 struct parport *pp;
115 struct parport_uss720_private *priv;
116 int status = urb->status;
117
118 rq = urb->context;
119 priv = rq->priv;
120 pp = priv->pp;
121 if (status) {
122 dev_err(&urb->dev->dev, "async_complete: urb error %d\n",
123 status);
124 } else if (rq->dr->bRequest == 3) {
125 memcpy(priv->reg, rq->reg, sizeof(priv->reg));
126#if 0
127 dev_dbg(&priv->usbdev->dev, "async_complete regs %7ph\n",
128 priv->reg);
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
138static 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 = kzalloc(sizeof(struct uss720_async_request), mem_flags);
153 if (!rq)
154 return NULL;
155 kref_init(&rq->ref_count);
156 INIT_LIST_HEAD(&rq->asynclist);
157 init_completion(&rq->compl);
158 kref_get(&priv->ref_count);
159 rq->priv = priv;
160 rq->urb = usb_alloc_urb(0, mem_flags);
161 if (!rq->urb) {
162 kref_put(&rq->ref_count, destroy_async);
163 return NULL;
164 }
165 rq->dr = kmalloc(sizeof(*rq->dr), mem_flags);
166 if (!rq->dr) {
167 kref_put(&rq->ref_count, destroy_async);
168 return NULL;
169 }
170 rq->dr->bRequestType = requesttype;
171 rq->dr->bRequest = request;
172 rq->dr->wValue = cpu_to_le16(value);
173 rq->dr->wIndex = cpu_to_le16(index);
174 rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
175 usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
176 (unsigned char *)rq->dr,
177 (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
178 /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
179 spin_lock_irqsave(&priv->asynclock, flags);
180 list_add_tail(&rq->asynclist, &priv->asynclist);
181 spin_unlock_irqrestore(&priv->asynclock, flags);
182 kref_get(&rq->ref_count);
183 ret = usb_submit_urb(rq->urb, mem_flags);
184 if (!ret)
185 return rq;
186 destroy_async(&rq->ref_count);
187 dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
188 return NULL;
189}
190
191static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
192{
193 struct uss720_async_request *rq;
194 unsigned long flags;
195 unsigned int ret = 0;
196
197 spin_lock_irqsave(&priv->asynclock, flags);
198 list_for_each_entry(rq, &priv->asynclist, asynclist) {
199 usb_unlink_urb(rq->urb);
200 ret++;
201 }
202 spin_unlock_irqrestore(&priv->asynclock, flags);
203 return ret;
204}
205
206/* --------------------------------------------------------------------- */
207
208static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
209{
210 struct parport_uss720_private *priv;
211 struct uss720_async_request *rq;
212 static const unsigned char regindex[9] = {
213 4, 0, 1, 5, 5, 0, 2, 3, 6
214 };
215 int ret;
216
217 if (!pp)
218 return -EIO;
219 priv = pp->private_data;
220 rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
221 if (!rq) {
222 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
223 (unsigned int)reg);
224 return -EIO;
225 }
226 if (!val) {
227 kref_put(&rq->ref_count, destroy_async);
228 return 0;
229 }
230 if (wait_for_completion_timeout(&rq->compl, HZ)) {
231 ret = rq->urb->status;
232 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
233 if (ret)
234 printk(KERN_WARNING "get_1284_register: "
235 "usb error %d\n", ret);
236 kref_put(&rq->ref_count, destroy_async);
237 return ret;
238 }
239 printk(KERN_WARNING "get_1284_register timeout\n");
240 kill_all_async_requests_priv(priv);
241 return -EIO;
242}
243
244static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
245{
246 struct parport_uss720_private *priv;
247 struct uss720_async_request *rq;
248
249 if (!pp)
250 return -EIO;
251 priv = pp->private_data;
252 rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
253 if (!rq) {
254 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
255 (unsigned int)reg, (unsigned int)val);
256 return -EIO;
257 }
258 kref_put(&rq->ref_count, destroy_async);
259 return 0;
260}
261
262/* --------------------------------------------------------------------- */
263
264/* ECR modes */
265#define ECR_SPP 00
266#define ECR_PS2 01
267#define ECR_PPF 02
268#define ECR_ECP 03
269#define ECR_EPP 04
270
271/* Safely change the mode bits in the ECR */
272static int change_mode(struct parport *pp, int m)
273{
274 struct parport_uss720_private *priv = pp->private_data;
275 int mode;
276 __u8 reg;
277
278 if (get_1284_register(pp, 6, ®, GFP_KERNEL))
279 return -EIO;
280 /* Bits <7:5> contain the mode. */
281 mode = (priv->reg[2] >> 5) & 0x7;
282 if (mode == m)
283 return 0;
284 /* We have to go through mode 000 or 001 */
285 if (mode > ECR_PS2 && m > ECR_PS2)
286 if (change_mode(pp, ECR_PS2))
287 return -EIO;
288
289 if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
290 /* This mode resets the FIFO, so we may
291 * have to wait for it to drain first. */
292 unsigned long expire = jiffies + pp->physport->cad->timeout;
293 switch (mode) {
294 case ECR_PPF: /* Parallel Port FIFO mode */
295 case ECR_ECP: /* ECP Parallel Port mode */
296 /* Poll slowly. */
297 for (;;) {
298 if (get_1284_register(pp, 6, ®, GFP_KERNEL))
299 return -EIO;
300 if (priv->reg[2] & 0x01)
301 break;
302 if (time_after_eq (jiffies, expire))
303 /* The FIFO is stuck. */
304 return -EBUSY;
305 msleep_interruptible(10);
306 if (signal_pending (current))
307 break;
308 }
309 }
310 }
311 /* Set the mode. */
312 if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
313 return -EIO;
314 if (get_1284_register(pp, 6, ®, GFP_KERNEL))
315 return -EIO;
316 return 0;
317}
318
319/*
320 * Clear TIMEOUT BIT in EPP MODE
321 */
322static int clear_epp_timeout(struct parport *pp)
323{
324 unsigned char stat;
325
326 if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
327 return 1;
328 return stat & 1;
329}
330
331/*
332 * Access functions.
333 */
334#if 0
335static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
336{
337 struct parport *pp = (struct parport *)dev_id;
338 struct parport_uss720_private *priv = pp->private_data;
339
340 if (usbstatus != 0 || len < 4 || !buffer)
341 return 1;
342 memcpy(priv->reg, buffer, 4);
343 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
344 if (priv->reg[2] & priv->reg[1] & 0x10)
345 parport_generic_irq(pp);
346 return 1;
347}
348#endif
349
350static void parport_uss720_write_data(struct parport *pp, unsigned char d)
351{
352 set_1284_register(pp, 0, d, GFP_KERNEL);
353}
354
355static unsigned char parport_uss720_read_data(struct parport *pp)
356{
357 unsigned char ret;
358
359 if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
360 return 0;
361 return ret;
362}
363
364static void parport_uss720_write_control(struct parport *pp, unsigned char d)
365{
366 struct parport_uss720_private *priv = pp->private_data;
367
368 d = (d & 0xf) | (priv->reg[1] & 0xf0);
369 if (set_1284_register(pp, 2, d, GFP_KERNEL))
370 return;
371 priv->reg[1] = d;
372}
373
374static unsigned char parport_uss720_read_control(struct parport *pp)
375{
376 struct parport_uss720_private *priv = pp->private_data;
377 return priv->reg[1] & 0xf; /* Use soft copy */
378}
379
380static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
381{
382 struct parport_uss720_private *priv = pp->private_data;
383 unsigned char d;
384
385 mask &= 0x0f;
386 val &= 0x0f;
387 d = (priv->reg[1] & (~mask)) ^ val;
388 if (set_1284_register(pp, 2, d, GFP_KERNEL))
389 return 0;
390 priv->reg[1] = d;
391 return d & 0xf;
392}
393
394static unsigned char parport_uss720_read_status(struct parport *pp)
395{
396 unsigned char ret;
397
398 if (get_1284_register(pp, 1, &ret, GFP_KERNEL))
399 return 0;
400 return ret & 0xf8;
401}
402
403static void parport_uss720_disable_irq(struct parport *pp)
404{
405 struct parport_uss720_private *priv = pp->private_data;
406 unsigned char d;
407
408 d = priv->reg[1] & ~0x10;
409 if (set_1284_register(pp, 2, d, GFP_KERNEL))
410 return;
411 priv->reg[1] = d;
412}
413
414static void parport_uss720_enable_irq(struct parport *pp)
415{
416 struct parport_uss720_private *priv = pp->private_data;
417 unsigned char d;
418
419 d = priv->reg[1] | 0x10;
420 if (set_1284_register(pp, 2, d, GFP_KERNEL))
421 return;
422 priv->reg[1] = d;
423}
424
425static void parport_uss720_data_forward (struct parport *pp)
426{
427 struct parport_uss720_private *priv = pp->private_data;
428 unsigned char d;
429
430 d = priv->reg[1] & ~0x20;
431 if (set_1284_register(pp, 2, d, GFP_KERNEL))
432 return;
433 priv->reg[1] = d;
434}
435
436static void parport_uss720_data_reverse (struct parport *pp)
437{
438 struct parport_uss720_private *priv = pp->private_data;
439 unsigned char d;
440
441 d = priv->reg[1] | 0x20;
442 if (set_1284_register(pp, 2, d, GFP_KERNEL))
443 return;
444 priv->reg[1] = d;
445}
446
447static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
448{
449 s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
450 s->u.pc.ecr = 0x24;
451}
452
453static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
454{
455 struct parport_uss720_private *priv = pp->private_data;
456
457#if 0
458 if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
459 return;
460#endif
461 s->u.pc.ctr = priv->reg[1];
462 s->u.pc.ecr = priv->reg[2];
463}
464
465static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
466{
467 struct parport_uss720_private *priv = pp->private_data;
468
469 set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
470 set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
471 get_1284_register(pp, 2, NULL, GFP_ATOMIC);
472 priv->reg[1] = s->u.pc.ctr;
473 priv->reg[2] = s->u.pc.ecr;
474}
475
476static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
477{
478 struct parport_uss720_private *priv = pp->private_data;
479 size_t got = 0;
480
481 if (change_mode(pp, ECR_EPP))
482 return 0;
483 for (; got < length; got++) {
484 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
485 break;
486 buf++;
487 if (priv->reg[0] & 0x01) {
488 clear_epp_timeout(pp);
489 break;
490 }
491 }
492 change_mode(pp, ECR_PS2);
493 return got;
494}
495
496static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
497{
498#if 0
499 struct parport_uss720_private *priv = pp->private_data;
500 size_t written = 0;
501
502 if (change_mode(pp, ECR_EPP))
503 return 0;
504 for (; written < length; written++) {
505 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
506 break;
507 ((char*)buf)++;
508 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
509 break;
510 if (priv->reg[0] & 0x01) {
511 clear_epp_timeout(pp);
512 break;
513 }
514 }
515 change_mode(pp, ECR_PS2);
516 return written;
517#else
518 struct parport_uss720_private *priv = pp->private_data;
519 struct usb_device *usbdev = priv->usbdev;
520 int rlen;
521 int i;
522
523 if (!usbdev)
524 return 0;
525 if (change_mode(pp, ECR_EPP))
526 return 0;
527 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
528 if (i)
529 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buf, length, rlen);
530 change_mode(pp, ECR_PS2);
531 return rlen;
532#endif
533}
534
535static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
536{
537 struct parport_uss720_private *priv = pp->private_data;
538 size_t got = 0;
539
540 if (change_mode(pp, ECR_EPP))
541 return 0;
542 for (; got < length; got++) {
543 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
544 break;
545 buf++;
546 if (priv->reg[0] & 0x01) {
547 clear_epp_timeout(pp);
548 break;
549 }
550 }
551 change_mode(pp, ECR_PS2);
552 return got;
553}
554
555static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
556{
557 struct parport_uss720_private *priv = pp->private_data;
558 size_t written = 0;
559
560 if (change_mode(pp, ECR_EPP))
561 return 0;
562 for (; written < length; written++) {
563 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
564 break;
565 buf++;
566 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
567 break;
568 if (priv->reg[0] & 0x01) {
569 clear_epp_timeout(pp);
570 break;
571 }
572 }
573 change_mode(pp, ECR_PS2);
574 return written;
575}
576
577static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
578{
579 struct parport_uss720_private *priv = pp->private_data;
580 struct usb_device *usbdev = priv->usbdev;
581 int rlen;
582 int i;
583
584 if (!usbdev)
585 return 0;
586 if (change_mode(pp, ECR_ECP))
587 return 0;
588 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
589 if (i)
590 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
591 change_mode(pp, ECR_PS2);
592 return rlen;
593}
594
595static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
596{
597 struct parport_uss720_private *priv = pp->private_data;
598 struct usb_device *usbdev = priv->usbdev;
599 int rlen;
600 int i;
601
602 if (!usbdev)
603 return 0;
604 if (change_mode(pp, ECR_ECP))
605 return 0;
606 i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
607 if (i)
608 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %Zu rlen %u\n", buffer, len, rlen);
609 change_mode(pp, ECR_PS2);
610 return rlen;
611}
612
613static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
614{
615 size_t written = 0;
616
617 if (change_mode(pp, ECR_ECP))
618 return 0;
619 for (; written < len; written++) {
620 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
621 break;
622 buffer++;
623 }
624 change_mode(pp, ECR_PS2);
625 return written;
626}
627
628static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
629{
630 struct parport_uss720_private *priv = pp->private_data;
631 struct usb_device *usbdev = priv->usbdev;
632 int rlen;
633 int i;
634
635 if (!usbdev)
636 return 0;
637 if (change_mode(pp, ECR_PPF))
638 return 0;
639 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
640 if (i)
641 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
642 change_mode(pp, ECR_PS2);
643 return rlen;
644}
645
646/* --------------------------------------------------------------------- */
647
648static struct parport_operations parport_uss720_ops =
649{
650 .owner = THIS_MODULE,
651 .write_data = parport_uss720_write_data,
652 .read_data = parport_uss720_read_data,
653
654 .write_control = parport_uss720_write_control,
655 .read_control = parport_uss720_read_control,
656 .frob_control = parport_uss720_frob_control,
657
658 .read_status = parport_uss720_read_status,
659
660 .enable_irq = parport_uss720_enable_irq,
661 .disable_irq = parport_uss720_disable_irq,
662
663 .data_forward = parport_uss720_data_forward,
664 .data_reverse = parport_uss720_data_reverse,
665
666 .init_state = parport_uss720_init_state,
667 .save_state = parport_uss720_save_state,
668 .restore_state = parport_uss720_restore_state,
669
670 .epp_write_data = parport_uss720_epp_write_data,
671 .epp_read_data = parport_uss720_epp_read_data,
672 .epp_write_addr = parport_uss720_epp_write_addr,
673 .epp_read_addr = parport_uss720_epp_read_addr,
674
675 .ecp_write_data = parport_uss720_ecp_write_data,
676 .ecp_read_data = parport_uss720_ecp_read_data,
677 .ecp_write_addr = parport_uss720_ecp_write_addr,
678
679 .compat_write_data = parport_uss720_write_compat,
680 .nibble_read_data = parport_ieee1284_read_nibble,
681 .byte_read_data = parport_ieee1284_read_byte,
682};
683
684/* --------------------------------------------------------------------- */
685
686static int uss720_probe(struct usb_interface *intf,
687 const struct usb_device_id *id)
688{
689 struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
690 struct usb_host_interface *interface;
691 struct usb_host_endpoint *endpoint;
692 struct parport_uss720_private *priv;
693 struct parport *pp;
694 unsigned char reg;
695 int i;
696
697 dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n",
698 le16_to_cpu(usbdev->descriptor.idVendor),
699 le16_to_cpu(usbdev->descriptor.idProduct));
700
701 /* our known interfaces have 3 alternate settings */
702 if (intf->num_altsetting != 3) {
703 usb_put_dev(usbdev);
704 return -ENODEV;
705 }
706 i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
707 dev_dbg(&intf->dev, "set interface result %d\n", i);
708
709 interface = intf->cur_altsetting;
710
711 if (interface->desc.bNumEndpoints < 3) {
712 usb_put_dev(usbdev);
713 return -ENODEV;
714 }
715
716 /*
717 * Allocate parport interface
718 */
719 priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL);
720 if (!priv) {
721 usb_put_dev(usbdev);
722 return -ENOMEM;
723 }
724 priv->pp = NULL;
725 priv->usbdev = usbdev;
726 kref_init(&priv->ref_count);
727 spin_lock_init(&priv->asynclock);
728 INIT_LIST_HEAD(&priv->asynclist);
729 pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops);
730 if (!pp) {
731 printk(KERN_WARNING "uss720: could not register parport\n");
732 goto probe_abort;
733 }
734
735 priv->pp = pp;
736 pp->private_data = priv;
737 pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
738
739 /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
740 set_1284_register(pp, 7, 0x00, GFP_KERNEL);
741 set_1284_register(pp, 6, 0x30, GFP_KERNEL); /* PS/2 mode */
742 set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
743 /* debugging */
744 get_1284_register(pp, 0, ®, GFP_KERNEL);
745 dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg);
746
747 endpoint = &interface->endpoint[2];
748 dev_dbg(&intf->dev, "epaddr %d interval %d\n",
749 endpoint->desc.bEndpointAddress, endpoint->desc.bInterval);
750 parport_announce_port(pp);
751
752 usb_set_intfdata(intf, pp);
753 return 0;
754
755probe_abort:
756 kill_all_async_requests_priv(priv);
757 kref_put(&priv->ref_count, destroy_priv);
758 return -ENODEV;
759}
760
761static void uss720_disconnect(struct usb_interface *intf)
762{
763 struct parport *pp = usb_get_intfdata(intf);
764 struct parport_uss720_private *priv;
765 struct usb_device *usbdev;
766
767 dev_dbg(&intf->dev, "disconnect\n");
768 usb_set_intfdata(intf, NULL);
769 if (pp) {
770 priv = pp->private_data;
771 usbdev = priv->usbdev;
772 priv->usbdev = NULL;
773 priv->pp = NULL;
774 dev_dbg(&intf->dev, "parport_remove_port\n");
775 parport_remove_port(pp);
776 parport_put_port(pp);
777 kill_all_async_requests_priv(priv);
778 kref_put(&priv->ref_count, destroy_priv);
779 }
780 dev_dbg(&intf->dev, "disconnect done\n");
781}
782
783/* table of cables that work through this driver */
784static const struct usb_device_id uss720_table[] = {
785 { USB_DEVICE(0x047e, 0x1001) },
786 { USB_DEVICE(0x0557, 0x2001) },
787 { USB_DEVICE(0x0729, 0x1284) },
788 { USB_DEVICE(0x1293, 0x0002) },
789 { USB_DEVICE(0x050d, 0x0002) },
790 { } /* Terminating entry */
791};
792
793MODULE_DEVICE_TABLE (usb, uss720_table);
794
795
796static struct usb_driver uss720_driver = {
797 .name = "uss720",
798 .probe = uss720_probe,
799 .disconnect = uss720_disconnect,
800 .id_table = uss720_table,
801};
802
803/* --------------------------------------------------------------------- */
804
805MODULE_AUTHOR(DRIVER_AUTHOR);
806MODULE_DESCRIPTION(DRIVER_DESC);
807MODULE_LICENSE("GPL");
808
809static int __init uss720_init(void)
810{
811 int retval;
812 retval = usb_register(&uss720_driver);
813 if (retval)
814 goto out;
815
816 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
817 DRIVER_DESC "\n");
818 printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose "
819 "driver to allow nonstandard\n");
820 printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over "
821 "USS720 usb to parallel cables\n");
822 printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a "
823 "printer, use usblp instead\n");
824out:
825 return retval;
826}
827
828static void __exit uss720_cleanup(void)
829{
830 usb_deregister(&uss720_driver);
831}
832
833module_init(uss720_init);
834module_exit(uss720_cleanup);
835
836/* --------------------------------------------------------------------- */