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