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