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Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/audit
[linux-2.6-block.git] / drivers / usb / misc / uss720.c
CommitLineData
1da177e4
LT		 1/*****************************************************************************/
2
3/*
4 * uss720.c -- USS720 USB Parport Cable.
5 *
ecc1624a 6 * Copyright (C) 1999, 2005, 2010
0f36163d 7 * Thomas Sailer (t.sailer@alumni.ethz.ch)
1da177e4
LT		 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:
0f36163d
TS		 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
1da177e4
LT		 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>
0f36163d
TS		 50#include <linux/completion.h>
51#include <linux/kref.h>
5a0e3ad6 52#include <linux/slab.h>
1da177e4
LT		 53
54/*
55 * Version Information
56 */
0f36163d
TS		 57#define DRIVER_VERSION "v0.6"
58#define DRIVER_AUTHOR "Thomas M. Sailer, t.sailer@alumni.ethz.ch"
1da177e4
LT		 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;
0f36163d
TS		 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;
9821aa9d 78 struct usb_ctrlrequest *dr;
0f36163d 79 __u8 reg[7];
1da177e4
LT		 80};
81
82/* --------------------------------------------------------------------- */
83
0f36163d 84static void destroy_priv(struct kref *kref)
1da177e4 85{
0f36163d 86 struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count);
1da177e4 87
7a2d2810 88 dev_dbg(&priv->usbdev->dev, "destroying priv datastructure\n");
0f36163d
TS		 89 usb_put_dev(priv->usbdev);
90 kfree(priv);
0f36163d
TS		 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);
9821aa9d 101 kfree(rq->dr);
0f36163d
TS		 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
7d12e780 111static void async_complete(struct urb *urb)
0f36163d
TS		 112{
113 struct uss720_async_request *rq;
114 struct parport *pp;
115 struct parport_uss720_private *priv;
82210d37 116 int status = urb->status;
0f36163d
TS		 117
118 rq = urb->context;
119 priv = rq->priv;
120 pp = priv->pp;
82210d37 121 if (status) {
d2b1ff71
GKH		 122 dev_err(&urb->dev->dev, "async_complete: urb error %d\n",
123 status);
9821aa9d 124 } else if (rq->dr->bRequest == 3) {
0f36163d 125 memcpy(priv->reg, rq->reg, sizeof(priv->reg));
1da177e4 126#if 0
7a2d2810
GKH		 127 dev_dbg(&priv->usbdev->dev,
128 "async_complete regs %02x %02x %02x %02x %02x %02x %02x\n",
129 (unsigned int)priv->reg[0], (unsigned int)priv->reg[1],
130 (unsigned int)priv->reg[2], (unsigned int)priv->reg[3],
131 (unsigned int)priv->reg[4], (unsigned int)priv->reg[5],
132 (unsigned int)priv->reg[6]);
1da177e4
LT		 133#endif
134 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
0f36163d 135 if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
f230d101 136 parport_generic_irq(pp);
1da177e4 137 }
0f36163d
TS		 138 complete(&rq->compl);
139 kref_put(&rq->ref_count, destroy_async);
1da177e4
LT		 140}
141
0f36163d
TS		 142static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
143 __u8 request, __u8 requesttype, __u16 value, __u16 index,
55016f10 144 gfp_t mem_flags)
1da177e4 145{
0f36163d
TS		 146 struct usb_device *usbdev;
147 struct uss720_async_request *rq;
148 unsigned long flags;
1da177e4
LT		 149 int ret;
150
0f36163d
TS		 151 if (!priv)
152 return NULL;
153 usbdev = priv->usbdev;
1da177e4 154 if (!usbdev)
0f36163d 155 return NULL;
9821aa9d 156 rq = kzalloc(sizeof(struct uss720_async_request), mem_flags);
0f36163d 157 if (!rq) {
d2b1ff71 158 dev_err(&usbdev->dev, "submit_async_request out of memory\n");
0f36163d
TS		 159 return NULL;
160 }
161 kref_init(&rq->ref_count);
162 INIT_LIST_HEAD(&rq->asynclist);
163 init_completion(&rq->compl);
164 kref_get(&priv->ref_count);
165 rq->priv = priv;
166 rq->urb = usb_alloc_urb(0, mem_flags);
167 if (!rq->urb) {
168 kref_put(&rq->ref_count, destroy_async);
d2b1ff71 169 dev_err(&usbdev->dev, "submit_async_request out of memory\n");
0f36163d
TS		 170 return NULL;
171 }
9821aa9d
JH		 172 rq->dr = kmalloc(sizeof(*rq->dr), mem_flags);
173 if (!rq->dr) {
174 kref_put(&rq->ref_count, destroy_async);
175 return NULL;
176 }
177 rq->dr->bRequestType = requesttype;
178 rq->dr->bRequest = request;
179 rq->dr->wValue = cpu_to_le16(value);
180 rq->dr->wIndex = cpu_to_le16(index);
181 rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
0f36163d 182 usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
9821aa9d 183 (unsigned char *)rq->dr,
0f36163d
TS		 184 (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
185 /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
186 spin_lock_irqsave(&priv->asynclock, flags);
187 list_add_tail(&rq->asynclist, &priv->asynclist);
188 spin_unlock_irqrestore(&priv->asynclock, flags);
adaa3c63 189 kref_get(&rq->ref_count);
0f36163d 190 ret = usb_submit_urb(rq->urb, mem_flags);
adaa3c63 191 if (!ret)
0f36163d 192 return rq;
adaa3c63 193 destroy_async(&rq->ref_count);
d2b1ff71 194 dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
0f36163d
TS		 195 return NULL;
196}
197
198static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
199{
200 struct uss720_async_request *rq;
201 unsigned long flags;
202 unsigned int ret = 0;
203
204 spin_lock_irqsave(&priv->asynclock, flags);
205 list_for_each_entry(rq, &priv->asynclist, asynclist) {
206 usb_unlink_urb(rq->urb);
207 ret++;
208 }
209 spin_unlock_irqrestore(&priv->asynclock, flags);
1da177e4
LT		 210 return ret;
211}
212
213/* --------------------------------------------------------------------- */
214
55016f10 215static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
0f36163d
TS		 216{
217 struct parport_uss720_private *priv;
218 struct uss720_async_request *rq;
219 static const unsigned char regindex[9] = {
220 4, 0, 1, 5, 5, 0, 2, 3, 6
221 };
222 int ret;
223
224 if (!pp)
225 return -EIO;
226 priv = pp->private_data;
227 rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
228 if (!rq) {
d2b1ff71
GKH		 229 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
230 (unsigned int)reg);
0f36163d
TS		 231 return -EIO;
232 }
233 if (!val) {
234 kref_put(&rq->ref_count, destroy_async);
235 return 0;
236 }
237 if (wait_for_completion_timeout(&rq->compl, HZ)) {
238 ret = rq->urb->status;
239 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
240 if (ret)
3b6004f3
GKH		 241 printk(KERN_WARNING "get_1284_register: "
242 "usb error %d\n", ret);
0f36163d
TS		 243 kref_put(&rq->ref_count, destroy_async);
244 return ret;
245 }
3b6004f3 246 printk(KERN_WARNING "get_1284_register timeout\n");
0f36163d
TS		 247 kill_all_async_requests_priv(priv);
248 return -EIO;
249}
250
55016f10 251static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
0f36163d
TS		 252{
253 struct parport_uss720_private *priv;
254 struct uss720_async_request *rq;
255
256 if (!pp)
257 return -EIO;
258 priv = pp->private_data;
259 rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
260 if (!rq) {
d2b1ff71
GKH		 261 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
262 (unsigned int)reg, (unsigned int)val);
0f36163d
TS		 263 return -EIO;
264 }
265 kref_put(&rq->ref_count, destroy_async);
266 return 0;
267}
268
269/* --------------------------------------------------------------------- */
270
1da177e4
LT		 271/* ECR modes */
272#define ECR_SPP 00
273#define ECR_PS2 01
274#define ECR_PPF 02
275#define ECR_ECP 03
276#define ECR_EPP 04
277
278/* Safely change the mode bits in the ECR */
279static int change_mode(struct parport *pp, int m)
280{
281 struct parport_uss720_private *priv = pp->private_data;
282 int mode;
0f36163d 283 __u8 reg;
1da177e4 284
0f36163d 285 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
1da177e4
LT		 286 return -EIO;
287 /* Bits <7:5> contain the mode. */
288 mode = (priv->reg[2] >> 5) & 0x7;
289 if (mode == m)
290 return 0;
291 /* We have to go through mode 000 or 001 */
292 if (mode > ECR_PS2 && m > ECR_PS2)
293 if (change_mode(pp, ECR_PS2))
294 return -EIO;
295
296 if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
297 /* This mode resets the FIFO, so we may
298 * have to wait for it to drain first. */
299 unsigned long expire = jiffies + pp->physport->cad->timeout;
300 switch (mode) {
301 case ECR_PPF: /* Parallel Port FIFO mode */
302 case ECR_ECP: /* ECP Parallel Port mode */
303 /* Poll slowly. */
304 for (;;) {
0f36163d 305 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
1da177e4
LT		 306 return -EIO;
307 if (priv->reg[2] & 0x01)
308 break;
309 if (time_after_eq (jiffies, expire))
310 /* The FIFO is stuck. */
311 return -EBUSY;
312 msleep_interruptible(10);
313 if (signal_pending (current))
314 break;
315 }
316 }
317 }
318 /* Set the mode. */
0f36163d
TS		 319 if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
320 return -EIO;
321 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
1da177e4
LT		 322 return -EIO;
323 return 0;
324}
325
326/*
327 * Clear TIMEOUT BIT in EPP MODE
328 */
329static int clear_epp_timeout(struct parport *pp)
330{
331 unsigned char stat;
332
0f36163d 333 if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
1da177e4
LT		 334 return 1;
335 return stat & 1;
336}
337
338/*
339 * Access functions.
340 */
341#if 0
342static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
343{
344 struct parport *pp = (struct parport *)dev_id;
345 struct parport_uss720_private *priv = pp->private_data;
346
347 if (usbstatus != 0 || len < 4 || !buffer)
348 return 1;
349 memcpy(priv->reg, buffer, 4);
350 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
351 if (priv->reg[2] & priv->reg[1] & 0x10)
f230d101 352 parport_generic_irq(pp);
1da177e4
LT		 353 return 1;
354}
355#endif
356
357static void parport_uss720_write_data(struct parport *pp, unsigned char d)
358{
0f36163d 359 set_1284_register(pp, 0, d, GFP_KERNEL);
1da177e4
LT		 360}
361
362static unsigned char parport_uss720_read_data(struct parport *pp)
363{
364 unsigned char ret;
365
0f36163d 366 if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
1da177e4
LT		 367 return 0;
368 return ret;
369}
370
371static void parport_uss720_write_control(struct parport *pp, unsigned char d)
372{
373 struct parport_uss720_private *priv = pp->private_data;
374
375 d = (d & 0xf) | (priv->reg[1] & 0xf0);
0f36163d 376 if (set_1284_register(pp, 2, d, GFP_KERNEL))
1da177e4
LT		 377 return;
378 priv->reg[1] = d;
379}
380
381static unsigned char parport_uss720_read_control(struct parport *pp)
382{
383 struct parport_uss720_private *priv = pp->private_data;
384 return priv->reg[1] & 0xf; /* Use soft copy */
385}
386
387static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
388{
389 struct parport_uss720_private *priv = pp->private_data;
390 unsigned char d;
391
392 mask &= 0x0f;
393 val &= 0x0f;
394 d = (priv->reg[1] & (~mask)) ^ val;
0f36163d 395 if (set_1284_register(pp, 2, d, GFP_KERNEL))
1da177e4
LT		 396 return 0;
397 priv->reg[1] = d;
398 return d & 0xf;
399}
400
401static unsigned char parport_uss720_read_status(struct parport *pp)
402{
403 unsigned char ret;
404
0f36163d 405 if (get_1284_register(pp, 1, &ret, GFP_KERNEL))
1da177e4
LT		 406 return 0;
407 return ret & 0xf8;
408}
409
410static void parport_uss720_disable_irq(struct parport *pp)
411{
412 struct parport_uss720_private *priv = pp->private_data;
413 unsigned char d;
414
415 d = priv->reg[1] & ~0x10;
0f36163d 416 if (set_1284_register(pp, 2, d, GFP_KERNEL))
1da177e4
LT		 417 return;
418 priv->reg[1] = d;
419}
420
421static void parport_uss720_enable_irq(struct parport *pp)
422{
423 struct parport_uss720_private *priv = pp->private_data;
424 unsigned char d;
425
426 d = priv->reg[1] | 0x10;
0f36163d 427 if (set_1284_register(pp, 2, d, GFP_KERNEL))
1da177e4
LT		 428 return;
429 priv->reg[1] = d;
430}
431
432static void parport_uss720_data_forward (struct parport *pp)
433{
434 struct parport_uss720_private *priv = pp->private_data;
435 unsigned char d;
436
437 d = priv->reg[1] & ~0x20;
0f36163d 438 if (set_1284_register(pp, 2, d, GFP_KERNEL))
1da177e4
LT		 439 return;
440 priv->reg[1] = d;
441}
442
443static void parport_uss720_data_reverse (struct parport *pp)
444{
445 struct parport_uss720_private *priv = pp->private_data;
446 unsigned char d;
447
448 d = priv->reg[1] | 0x20;
0f36163d 449 if (set_1284_register(pp, 2, d, GFP_KERNEL))
1da177e4
LT		 450 return;
451 priv->reg[1] = d;
452}
453
454static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
455{
456 s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
457 s->u.pc.ecr = 0x24;
458}
459
460static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
461{
462 struct parport_uss720_private *priv = pp->private_data;
463
0f36163d
TS		 464#if 0
465 if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
1da177e4 466 return;
0f36163d 467#endif
1da177e4
LT		 468 s->u.pc.ctr = priv->reg[1];
469 s->u.pc.ecr = priv->reg[2];
470}
471
472static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
473{
0f36163d
TS		 474 struct parport_uss720_private *priv = pp->private_data;
475
476 set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
477 set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
478 get_1284_register(pp, 2, NULL, GFP_ATOMIC);
479 priv->reg[1] = s->u.pc.ctr;
480 priv->reg[2] = s->u.pc.ecr;
1da177e4
LT		 481}
482
483static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
484{
485 struct parport_uss720_private *priv = pp->private_data;
486 size_t got = 0;
487
488 if (change_mode(pp, ECR_EPP))
489 return 0;
490 for (; got < length; got++) {
0f36163d 491 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
1da177e4
LT		 492 break;
493 buf++;
494 if (priv->reg[0] & 0x01) {
495 clear_epp_timeout(pp);
496 break;
497 }
498 }
499 change_mode(pp, ECR_PS2);
500 return got;
501}
502
503static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
504{
505#if 0
506 struct parport_uss720_private *priv = pp->private_data;
507 size_t written = 0;
508
509 if (change_mode(pp, ECR_EPP))
510 return 0;
511 for (; written < length; written++) {
0f36163d 512 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
1da177e4
LT		 513 break;
514 ((char*)buf)++;
0f36163d 515 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
1da177e4
LT		 516 break;
517 if (priv->reg[0] & 0x01) {
518 clear_epp_timeout(pp);
519 break;
520 }
521 }
522 change_mode(pp, ECR_PS2);
523 return written;
524#else
525 struct parport_uss720_private *priv = pp->private_data;
526 struct usb_device *usbdev = priv->usbdev;
527 int rlen;
528 int i;
529
530 if (!usbdev)
531 return 0;
532 if (change_mode(pp, ECR_EPP))
533 return 0;
534 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
535 if (i)
536 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buf, length, rlen);
537 change_mode(pp, ECR_PS2);
538 return rlen;
539#endif
540}
541
542static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
543{
544 struct parport_uss720_private *priv = pp->private_data;
545 size_t got = 0;
546
547 if (change_mode(pp, ECR_EPP))
548 return 0;
549 for (; got < length; got++) {
0f36163d 550 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
1da177e4
LT		 551 break;
552 buf++;
553 if (priv->reg[0] & 0x01) {
554 clear_epp_timeout(pp);
555 break;
556 }
557 }
558 change_mode(pp, ECR_PS2);
559 return got;
560}
561
562static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
563{
564 struct parport_uss720_private *priv = pp->private_data;
565 size_t written = 0;
566
567 if (change_mode(pp, ECR_EPP))
568 return 0;
569 for (; written < length; written++) {
0f36163d 570 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
1da177e4
LT		 571 break;
572 buf++;
0f36163d 573 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
1da177e4
LT		 574 break;
575 if (priv->reg[0] & 0x01) {
576 clear_epp_timeout(pp);
577 break;
578 }
579 }
580 change_mode(pp, ECR_PS2);
581 return written;
582}
583
584static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
585{
586 struct parport_uss720_private *priv = pp->private_data;
587 struct usb_device *usbdev = priv->usbdev;
588 int rlen;
589 int i;
590
591 if (!usbdev)
592 return 0;
593 if (change_mode(pp, ECR_ECP))
594 return 0;
595 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
596 if (i)
597 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
598 change_mode(pp, ECR_PS2);
599 return rlen;
600}
601
602static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
603{
604 struct parport_uss720_private *priv = pp->private_data;
605 struct usb_device *usbdev = priv->usbdev;
606 int rlen;
607 int i;
608
609 if (!usbdev)
610 return 0;
611 if (change_mode(pp, ECR_ECP))
612 return 0;
613 i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
614 if (i)
615 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %Zu rlen %u\n", buffer, len, rlen);
616 change_mode(pp, ECR_PS2);
617 return rlen;
618}
619
620static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
621{
622 size_t written = 0;
623
624 if (change_mode(pp, ECR_ECP))
625 return 0;
626 for (; written < len; written++) {
0f36163d 627 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
1da177e4
LT		 628 break;
629 buffer++;
630 }
631 change_mode(pp, ECR_PS2);
632 return written;
633}
634
635static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
636{
637 struct parport_uss720_private *priv = pp->private_data;
638 struct usb_device *usbdev = priv->usbdev;
639 int rlen;
640 int i;
641
642 if (!usbdev)
643 return 0;
644 if (change_mode(pp, ECR_PPF))
645 return 0;
646 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
647 if (i)
648 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
649 change_mode(pp, ECR_PS2);
650 return rlen;
651}
652
653/* --------------------------------------------------------------------- */
654
655static struct parport_operations parport_uss720_ops =
656{
657 .owner = THIS_MODULE,
658 .write_data = parport_uss720_write_data,
659 .read_data = parport_uss720_read_data,
660
661 .write_control = parport_uss720_write_control,
662 .read_control = parport_uss720_read_control,
663 .frob_control = parport_uss720_frob_control,
664
665 .read_status = parport_uss720_read_status,
666
667 .enable_irq = parport_uss720_enable_irq,
668 .disable_irq = parport_uss720_disable_irq,
669
670 .data_forward = parport_uss720_data_forward,
671 .data_reverse = parport_uss720_data_reverse,
672
673 .init_state = parport_uss720_init_state,
674 .save_state = parport_uss720_save_state,
675 .restore_state = parport_uss720_restore_state,
676
677 .epp_write_data = parport_uss720_epp_write_data,
678 .epp_read_data = parport_uss720_epp_read_data,
679 .epp_write_addr = parport_uss720_epp_write_addr,
680 .epp_read_addr = parport_uss720_epp_read_addr,
681
682 .ecp_write_data = parport_uss720_ecp_write_data,
683 .ecp_read_data = parport_uss720_ecp_read_data,
684 .ecp_write_addr = parport_uss720_ecp_write_addr,
685
686 .compat_write_data = parport_uss720_write_compat,
687 .nibble_read_data = parport_ieee1284_read_nibble,
688 .byte_read_data = parport_ieee1284_read_byte,
689};
690
691/* --------------------------------------------------------------------- */
692
693static int uss720_probe(struct usb_interface *intf,
694 const struct usb_device_id *id)
695{
0f36163d 696 struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
1da177e4
LT		 697 struct usb_host_interface *interface;
698 struct usb_host_endpoint *endpoint;
699 struct parport_uss720_private *priv;
700 struct parport *pp;
0f36163d 701 unsigned char reg;
1da177e4
LT		 702 int i;
703
7a2d2810
GKH		 704 dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n",
705 le16_to_cpu(usbdev->descriptor.idVendor),
706 le16_to_cpu(usbdev->descriptor.idProduct));
1da177e4
LT		 707
708 /* our known interfaces have 3 alternate settings */
0f36163d
TS		 709 if (intf->num_altsetting != 3) {
710 usb_put_dev(usbdev);
1da177e4 711 return -ENODEV;
0f36163d 712 }
1da177e4 713 i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
cf2fbdd2 714 dev_dbg(&intf->dev, "set interface result %d\n", i);
1da177e4
LT		 715
716 interface = intf->cur_altsetting;
717
718 /*
719 * Allocate parport interface
720 */
cd861280 721 if (!(priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL))) {
0f36163d 722 usb_put_dev(usbdev);
1da177e4 723 return -ENOMEM;
0f36163d
TS		 724 }
725 priv->pp = NULL;
726 priv->usbdev = usbdev;
727 kref_init(&priv->ref_count);
728 spin_lock_init(&priv->asynclock);
729 INIT_LIST_HEAD(&priv->asynclist);
1da177e4 730 if (!(pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops))) {
3b6004f3 731 printk(KERN_WARNING "uss720: could not register parport\n");
1da177e4
LT		 732 goto probe_abort;
733 }
734
0f36163d 735 priv->pp = pp;
1da177e4 736 pp->private_data = priv;
1da177e4
LT		 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 */
0f36163d
TS		 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);
1da177e4 743 /* debugging */
0f36163d 744 get_1284_register(pp, 0, &reg, GFP_KERNEL);
7a2d2810
GKH		 745 dev_dbg(&intf->dev, "reg: %02x %02x %02x %02x %02x %02x %02x\n",
746 priv->reg[0], priv->reg[1], priv->reg[2], priv->reg[3],
747 priv->reg[4], priv->reg[5], priv->reg[6]);
1da177e4
LT		 748
749 endpoint = &interface->endpoint[2];
7a2d2810
GKH		 750 dev_dbg(&intf->dev, "epaddr %d interval %d\n",
751 endpoint->desc.bEndpointAddress, endpoint->desc.bInterval);
1da177e4
LT		 752 parport_announce_port(pp);
753
0f36163d 754 usb_set_intfdata(intf, pp);
1da177e4
LT		 755 return 0;
756
1da177e4 757probe_abort:
0f36163d
TS		 758 kill_all_async_requests_priv(priv);
759 kref_put(&priv->ref_count, destroy_priv);
1da177e4
LT		 760 return -ENODEV;
761}
762
763static void uss720_disconnect(struct usb_interface *intf)
764{
0f36163d 765 struct parport *pp = usb_get_intfdata(intf);
1da177e4 766 struct parport_uss720_private *priv;
0f36163d 767 struct usb_device *usbdev;
1da177e4 768
7a2d2810 769 dev_dbg(&intf->dev, "disconnect\n");
0f36163d 770 usb_set_intfdata(intf, NULL);
1da177e4
LT		 771 if (pp) {
772 priv = pp->private_data;
0f36163d 773 usbdev = priv->usbdev;
1da177e4 774 priv->usbdev = NULL;
0f36163d 775 priv->pp = NULL;
7a2d2810 776 dev_dbg(&intf->dev, "parport_remove_port\n");
0f36163d 777 parport_remove_port(pp);
1da177e4 778 parport_put_port(pp);
0f36163d
TS		 779 kill_all_async_requests_priv(priv);
780 kref_put(&priv->ref_count, destroy_priv);
1da177e4 781 }
7a2d2810 782 dev_dbg(&intf->dev, "disconnect done\n");
1da177e4
LT		 783}
784
785/* table of cables that work through this driver */
33b9e162 786static const struct usb_device_id uss720_table[] = {
1da177e4
LT		 787 { USB_DEVICE(0x047e, 0x1001) },
788 { USB_DEVICE(0x0557, 0x2001) },
789 { USB_DEVICE(0x0729, 0x1284) },
790 { USB_DEVICE(0x1293, 0x0002) },
ecc1624a 791 { USB_DEVICE(0x050d, 0x0002) },
1da177e4
LT		 792 { } /* Terminating entry */
793};
794
795MODULE_DEVICE_TABLE (usb, uss720_table);
796
797
798static struct usb_driver uss720_driver = {
1da177e4
LT		 799 .name = "uss720",
800 .probe = uss720_probe,
801 .disconnect = uss720_disconnect,
802 .id_table = uss720_table,
803};
804
805/* --------------------------------------------------------------------- */
806
0f36163d
TS		 807MODULE_AUTHOR(DRIVER_AUTHOR);
808MODULE_DESCRIPTION(DRIVER_DESC);
1da177e4
LT		 809MODULE_LICENSE("GPL");
810
811static int __init uss720_init(void)
812{
813 int retval;
814 retval = usb_register(&uss720_driver);
815 if (retval)
816 goto out;
817
1b29a375
GKH		 818 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
819 DRIVER_DESC "\n");
820 printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose "
821 "driver to allow nonstandard\n");
822 printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over "
823 "USS720 usb to parallel cables\n");
824 printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a "
825 "printer, use usblp instead\n");
1da177e4
LT		 826out:
827 return retval;
828}
829
830static void __exit uss720_cleanup(void)
831{
832 usb_deregister(&uss720_driver);
833}
834
835module_init(uss720_init);
836module_exit(uss720_cleanup);
837
838/* --------------------------------------------------------------------- */
Linux 6.x block layer and io_uring tree(s)