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