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