1 // SPDX-License-Identifier: GPL-2.0+
2 /*****************************************************************************/
3
4 /*
5 * uss720.c -- USS720 USB Parport Cable.
6 *
7 * Copyright (C) 1999, 2005, 2010
8 * Thomas Sailer (t.sailer@alumni.ethz.ch)
9 *
10 * Based on parport_pc.c
11 *
12 * History:
13 * 0.1 04.08.1999 Created
14 * 0.2 07.08.1999 Some fixes mainly suggested by Tim Waugh
15 * Interrupt handling currently disabled because
16 * usb_request_irq crashes somewhere within ohci.c
17 * for no apparent reason (that is for me, anyway)
18 * ECP currently untested
19 * 0.3 10.08.1999 fixing merge errors
20 * 0.4 13.08.1999 Added Vendor/Product ID of Brad Hard's cable
21 * 0.5 20.09.1999 usb_control_msg wrapper used
22 * Nov01.2000 usb_device_table support by Adam J. Richter
23 * 08.04.2001 Identify version on module load. gb
24 * 0.6 02.09.2005 Fix "scheduling in interrupt" problem by making save/restore
25 * context asynchronous
26 *
27 */
28
29 /*****************************************************************************/
30
31 #include <linux/module.h>
32 #include <linux/socket.h>
33 #include <linux/parport.h>
34 #include <linux/init.h>
35 #include <linux/usb.h>
36 #include <linux/delay.h>
37 #include <linux/completion.h>
38 #include <linux/kref.h>
39 #include <linux/slab.h>
40 #include <linux/sched/signal.h>
41
42 #define DRIVER_AUTHOR "Thomas M. Sailer, t.sailer@alumni.ethz.ch"
43 #define DRIVER_DESC "USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip"
44
45 /* --------------------------------------------------------------------- */
46
47 struct parport_uss720_private {
48 struct usb_device *usbdev;
49 struct parport *pp;
50 struct kref ref_count;
51 __u8 reg[7]; /* USB registers */
52 struct list_head asynclist;
53 spinlock_t asynclock;
54 };
55
56 struct uss720_async_request {
57 struct parport_uss720_private *priv;
58 struct kref ref_count;
59 struct list_head asynclist;
60 struct completion compl;
61 struct urb *urb;
62 struct usb_ctrlrequest *dr;
63 __u8 reg[7];
64 };
65
66 /* --------------------------------------------------------------------- */
67
destroy_priv(struct kref * kref)68 static void destroy_priv(struct kref *kref)
69 {
70 struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count);
71
72 dev_dbg(&priv->usbdev->dev, "destroying priv datastructure\n");
73 usb_put_dev(priv->usbdev);
74 priv->usbdev = NULL;
75 kfree(priv);
76 }
77
destroy_async(struct kref * kref)78 static void destroy_async(struct kref *kref)
79 {
80 struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count);
81 struct parport_uss720_private *priv = rq->priv;
82 unsigned long flags;
83
84 if (likely(rq->urb))
85 usb_free_urb(rq->urb);
86 kfree(rq->dr);
87 spin_lock_irqsave(&priv->asynclock, flags);
88 list_del_init(&rq->asynclist);
89 spin_unlock_irqrestore(&priv->asynclock, flags);
90 kfree(rq);
91 kref_put(&priv->ref_count, destroy_priv);
92 }
93
94 /* --------------------------------------------------------------------- */
95
async_complete(struct urb * urb)96 static void async_complete(struct urb *urb)
97 {
98 struct uss720_async_request *rq;
99 struct parport *pp;
100 struct parport_uss720_private *priv;
101 int status = urb->status;
102
103 rq = urb->context;
104 priv = rq->priv;
105 pp = priv->pp;
106 if (status) {
107 dev_err(&urb->dev->dev, "async_complete: urb error %d\n",
108 status);
109 } else if (rq->dr->bRequest == 3) {
110 memcpy(priv->reg, rq->reg, sizeof(priv->reg));
111 #if 0
112 dev_dbg(&priv->usbdev->dev, "async_complete regs %7ph\n",
113 priv->reg);
114 #endif
115 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
116 if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
117 parport_generic_irq(pp);
118 }
119 complete(&rq->compl);
120 kref_put(&rq->ref_count, destroy_async);
121 }
122
submit_async_request(struct parport_uss720_private * priv,__u8 request,__u8 requesttype,__u16 value,__u16 index,gfp_t mem_flags)123 static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
124 __u8 request, __u8 requesttype, __u16 value, __u16 index,
125 gfp_t mem_flags)
126 {
127 struct usb_device *usbdev;
128 struct uss720_async_request *rq;
129 unsigned long flags;
130 int ret;
131
132 if (!priv)
133 return NULL;
134 usbdev = priv->usbdev;
135 if (!usbdev)
136 return NULL;
137 rq = kzalloc(sizeof(struct uss720_async_request), mem_flags);
138 if (!rq)
139 return NULL;
140 kref_init(&rq->ref_count);
141 INIT_LIST_HEAD(&rq->asynclist);
142 init_completion(&rq->compl);
143 kref_get(&priv->ref_count);
144 rq->priv = priv;
145 rq->urb = usb_alloc_urb(0, mem_flags);
146 if (!rq->urb) {
147 kref_put(&rq->ref_count, destroy_async);
148 return NULL;
149 }
150 rq->dr = kmalloc(sizeof(*rq->dr), mem_flags);
151 if (!rq->dr) {
152 kref_put(&rq->ref_count, destroy_async);
153 return NULL;
154 }
155 rq->dr->bRequestType = requesttype;
156 rq->dr->bRequest = request;
157 rq->dr->wValue = cpu_to_le16(value);
158 rq->dr->wIndex = cpu_to_le16(index);
159 rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
160 usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
161 (unsigned char *)rq->dr,
162 (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
163 /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
164 spin_lock_irqsave(&priv->asynclock, flags);
165 list_add_tail(&rq->asynclist, &priv->asynclist);
166 spin_unlock_irqrestore(&priv->asynclock, flags);
167 kref_get(&rq->ref_count);
168 ret = usb_submit_urb(rq->urb, mem_flags);
169 if (!ret)
170 return rq;
171 destroy_async(&rq->ref_count);
172 dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
173 return NULL;
174 }
175
kill_all_async_requests_priv(struct parport_uss720_private * priv)176 static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
177 {
178 struct uss720_async_request *rq;
179 unsigned long flags;
180 unsigned int ret = 0;
181
182 spin_lock_irqsave(&priv->asynclock, flags);
183 list_for_each_entry(rq, &priv->asynclist, asynclist) {
184 usb_unlink_urb(rq->urb);
185 ret++;
186 }
187 spin_unlock_irqrestore(&priv->asynclock, flags);
188 return ret;
189 }
190
191 /* --------------------------------------------------------------------- */
192
get_1284_register(struct parport * pp,unsigned char reg,unsigned char * val,gfp_t mem_flags)193 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
194 {
195 struct parport_uss720_private *priv;
196 struct uss720_async_request *rq;
197 static const unsigned char regindex[9] = {
198 4, 0, 1, 5, 5, 0, 2, 3, 6
199 };
200 int ret;
201
202 if (!pp)
203 return -EIO;
204 priv = pp->private_data;
205 rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
206 if (!rq) {
207 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
208 (unsigned int)reg);
209 return -EIO;
210 }
211 if (!val) {
212 kref_put(&rq->ref_count, destroy_async);
213 return 0;
214 }
215 if (wait_for_completion_timeout(&rq->compl, HZ)) {
216 ret = rq->urb->status;
217 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
218 if (ret)
219 printk(KERN_WARNING "get_1284_register: "
220 "usb error %d\n", ret);
221 kref_put(&rq->ref_count, destroy_async);
222 return ret;
223 }
224 printk(KERN_WARNING "get_1284_register timeout\n");
225 kill_all_async_requests_priv(priv);
226 return -EIO;
227 }
228
set_1284_register(struct parport * pp,unsigned char reg,unsigned char val,gfp_t mem_flags)229 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
230 {
231 struct parport_uss720_private *priv;
232 struct uss720_async_request *rq;
233
234 if (!pp)
235 return -EIO;
236 priv = pp->private_data;
237 rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
238 if (!rq) {
239 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
240 (unsigned int)reg, (unsigned int)val);
241 return -EIO;
242 }
243 kref_put(&rq->ref_count, destroy_async);
244 return 0;
245 }
246
247 /* --------------------------------------------------------------------- */
248
249 /* ECR modes */
250 #define ECR_SPP 00
251 #define ECR_PS2 01
252 #define ECR_PPF 02
253 #define ECR_ECP 03
254 #define ECR_EPP 04
255
256 /* Safely change the mode bits in the ECR */
change_mode(struct parport * pp,int m)257 static int change_mode(struct parport *pp, int m)
258 {
259 struct parport_uss720_private *priv = pp->private_data;
260 int mode;
261 __u8 reg;
262
263 if (get_1284_register(pp, 6, ®, GFP_KERNEL))
264 return -EIO;
265 /* Bits <7:5> contain the mode. */
266 mode = (priv->reg[2] >> 5) & 0x7;
267 if (mode == m)
268 return 0;
269 /* We have to go through mode 000 or 001 */
270 if (mode > ECR_PS2 && m > ECR_PS2)
271 if (change_mode(pp, ECR_PS2))
272 return -EIO;
273
274 if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
275 /* This mode resets the FIFO, so we may
276 * have to wait for it to drain first. */
277 unsigned long expire = jiffies + pp->physport->cad->timeout;
278 switch (mode) {
279 case ECR_PPF: /* Parallel Port FIFO mode */
280 case ECR_ECP: /* ECP Parallel Port mode */
281 /* Poll slowly. */
282 for (;;) {
283 if (get_1284_register(pp, 6, ®, GFP_KERNEL))
284 return -EIO;
285 if (priv->reg[2] & 0x01)
286 break;
287 if (time_after_eq (jiffies, expire))
288 /* The FIFO is stuck. */
289 return -EBUSY;
290 msleep_interruptible(10);
291 if (signal_pending (current))
292 break;
293 }
294 }
295 }
296 /* Set the mode. */
297 if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
298 return -EIO;
299 if (get_1284_register(pp, 6, ®, GFP_KERNEL))
300 return -EIO;
301 return 0;
302 }
303
304 /*
305 * Clear TIMEOUT BIT in EPP MODE
306 */
clear_epp_timeout(struct parport * pp)307 static int clear_epp_timeout(struct parport *pp)
308 {
309 unsigned char stat;
310
311 if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
312 return 1;
313 return stat & 1;
314 }
315
316 /*
317 * Access functions.
318 */
319 #if 0
320 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
321 {
322 struct parport *pp = (struct parport *)dev_id;
323 struct parport_uss720_private *priv = pp->private_data;
324
325 if (usbstatus != 0 || len < 4 || !buffer)
326 return 1;
327 memcpy(priv->reg, buffer, 4);
328 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
329 if (priv->reg[2] & priv->reg[1] & 0x10)
330 parport_generic_irq(pp);
331 return 1;
332 }
333 #endif
334
parport_uss720_write_data(struct parport * pp,unsigned char d)335 static void parport_uss720_write_data(struct parport *pp, unsigned char d)
336 {
337 set_1284_register(pp, 0, d, GFP_KERNEL);
338 }
339
parport_uss720_read_data(struct parport * pp)340 static unsigned char parport_uss720_read_data(struct parport *pp)
341 {
342 unsigned char ret;
343
344 if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
345 return 0;
346 return ret;
347 }
348
parport_uss720_write_control(struct parport * pp,unsigned char d)349 static void parport_uss720_write_control(struct parport *pp, unsigned char d)
350 {
351 struct parport_uss720_private *priv = pp->private_data;
352
353 d = (d & 0xf) | (priv->reg[1] & 0xf0);
354 if (set_1284_register(pp, 2, d, GFP_KERNEL))
355 return;
356 priv->reg[1] = d;
357 }
358
parport_uss720_read_control(struct parport * pp)359 static unsigned char parport_uss720_read_control(struct parport *pp)
360 {
361 struct parport_uss720_private *priv = pp->private_data;
362 return priv->reg[1] & 0xf; /* Use soft copy */
363 }
364
parport_uss720_frob_control(struct parport * pp,unsigned char mask,unsigned char val)365 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
366 {
367 struct parport_uss720_private *priv = pp->private_data;
368 unsigned char d;
369
370 mask &= 0x0f;
371 val &= 0x0f;
372 d = (priv->reg[1] & (~mask)) ^ val;
373 if (set_1284_register(pp, 2, d, GFP_ATOMIC))
374 return 0;
375 priv->reg[1] = d;
376 return d & 0xf;
377 }
378
parport_uss720_read_status(struct parport * pp)379 static unsigned char parport_uss720_read_status(struct parport *pp)
380 {
381 unsigned char ret;
382
383 if (get_1284_register(pp, 1, &ret, GFP_ATOMIC))
384 return 0;
385 return ret & 0xf8;
386 }
387
parport_uss720_disable_irq(struct parport * pp)388 static void parport_uss720_disable_irq(struct parport *pp)
389 {
390 struct parport_uss720_private *priv = pp->private_data;
391 unsigned char d;
392
393 d = priv->reg[1] & ~0x10;
394 if (set_1284_register(pp, 2, d, GFP_KERNEL))
395 return;
396 priv->reg[1] = d;
397 }
398
parport_uss720_enable_irq(struct parport * pp)399 static void parport_uss720_enable_irq(struct parport *pp)
400 {
401 struct parport_uss720_private *priv = pp->private_data;
402 unsigned char d;
403
404 d = priv->reg[1] | 0x10;
405 if (set_1284_register(pp, 2, d, GFP_KERNEL))
406 return;
407 priv->reg[1] = d;
408 }
409
parport_uss720_data_forward(struct parport * pp)410 static void parport_uss720_data_forward (struct parport *pp)
411 {
412 struct parport_uss720_private *priv = pp->private_data;
413 unsigned char d;
414
415 d = priv->reg[1] & ~0x20;
416 if (set_1284_register(pp, 2, d, GFP_KERNEL))
417 return;
418 priv->reg[1] = d;
419 }
420
parport_uss720_data_reverse(struct parport * pp)421 static void parport_uss720_data_reverse (struct parport *pp)
422 {
423 struct parport_uss720_private *priv = pp->private_data;
424 unsigned char d;
425
426 d = priv->reg[1] | 0x20;
427 if (set_1284_register(pp, 2, d, GFP_KERNEL))
428 return;
429 priv->reg[1] = d;
430 }
431
parport_uss720_init_state(struct pardevice * dev,struct parport_state * s)432 static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
433 {
434 s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
435 s->u.pc.ecr = 0x24;
436 }
437
parport_uss720_save_state(struct parport * pp,struct parport_state * s)438 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
439 {
440 struct parport_uss720_private *priv = pp->private_data;
441
442 #if 0
443 if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
444 return;
445 #endif
446 s->u.pc.ctr = priv->reg[1];
447 s->u.pc.ecr = priv->reg[2];
448 }
449
parport_uss720_restore_state(struct parport * pp,struct parport_state * s)450 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
451 {
452 struct parport_uss720_private *priv = pp->private_data;
453
454 set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
455 set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
456 get_1284_register(pp, 2, NULL, GFP_ATOMIC);
457 priv->reg[1] = s->u.pc.ctr;
458 priv->reg[2] = s->u.pc.ecr;
459 }
460
parport_uss720_epp_read_data(struct parport * pp,void * buf,size_t length,int flags)461 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
462 {
463 struct parport_uss720_private *priv = pp->private_data;
464 size_t got = 0;
465
466 if (change_mode(pp, ECR_EPP))
467 return 0;
468 for (; got < length; got++) {
469 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
470 break;
471 buf++;
472 if (priv->reg[0] & 0x01) {
473 clear_epp_timeout(pp);
474 break;
475 }
476 }
477 change_mode(pp, ECR_PS2);
478 return got;
479 }
480
parport_uss720_epp_write_data(struct parport * pp,const void * buf,size_t length,int flags)481 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
482 {
483 #if 0
484 struct parport_uss720_private *priv = pp->private_data;
485 size_t written = 0;
486
487 if (change_mode(pp, ECR_EPP))
488 return 0;
489 for (; written < length; written++) {
490 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
491 break;
492 ((char*)buf)++;
493 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
494 break;
495 if (priv->reg[0] & 0x01) {
496 clear_epp_timeout(pp);
497 break;
498 }
499 }
500 change_mode(pp, ECR_PS2);
501 return written;
502 #else
503 struct parport_uss720_private *priv = pp->private_data;
504 struct usb_device *usbdev = priv->usbdev;
505 int rlen = 0;
506 int i;
507
508 if (!usbdev)
509 return 0;
510 if (change_mode(pp, ECR_EPP))
511 return 0;
512 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
513 if (i)
514 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buf, length, rlen);
515 change_mode(pp, ECR_PS2);
516 return rlen;
517 #endif
518 }
519
parport_uss720_epp_read_addr(struct parport * pp,void * buf,size_t length,int flags)520 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
521 {
522 struct parport_uss720_private *priv = pp->private_data;
523 size_t got = 0;
524
525 if (change_mode(pp, ECR_EPP))
526 return 0;
527 for (; got < length; got++) {
528 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
529 break;
530 buf++;
531 if (priv->reg[0] & 0x01) {
532 clear_epp_timeout(pp);
533 break;
534 }
535 }
536 change_mode(pp, ECR_PS2);
537 return got;
538 }
539
parport_uss720_epp_write_addr(struct parport * pp,const void * buf,size_t length,int flags)540 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
541 {
542 struct parport_uss720_private *priv = pp->private_data;
543 size_t written = 0;
544
545 if (change_mode(pp, ECR_EPP))
546 return 0;
547 for (; written < length; written++) {
548 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
549 break;
550 buf++;
551 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
552 break;
553 if (priv->reg[0] & 0x01) {
554 clear_epp_timeout(pp);
555 break;
556 }
557 }
558 change_mode(pp, ECR_PS2);
559 return written;
560 }
561
parport_uss720_ecp_write_data(struct parport * pp,const void * buffer,size_t len,int flags)562 static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
563 {
564 struct parport_uss720_private *priv = pp->private_data;
565 struct usb_device *usbdev = priv->usbdev;
566 int rlen = 0;
567 int i;
568
569 if (!usbdev)
570 return 0;
571 if (change_mode(pp, ECR_ECP))
572 return 0;
573 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
574 if (i)
575 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen);
576 change_mode(pp, ECR_PS2);
577 return rlen;
578 }
579
parport_uss720_ecp_read_data(struct parport * pp,void * buffer,size_t len,int flags)580 static size_t parport_uss720_ecp_read_data(struct parport *pp, 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 = 0;
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_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
592 if (i)
593 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %zu rlen %u\n", buffer, len, rlen);
594 change_mode(pp, ECR_PS2);
595 return rlen;
596 }
597
parport_uss720_ecp_write_addr(struct parport * pp,const void * buffer,size_t len,int flags)598 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
599 {
600 size_t written = 0;
601
602 if (change_mode(pp, ECR_ECP))
603 return 0;
604 for (; written < len; written++) {
605 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
606 break;
607 buffer++;
608 }
609 change_mode(pp, ECR_PS2);
610 return written;
611 }
612
parport_uss720_write_compat(struct parport * pp,const void * buffer,size_t len,int flags)613 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
614 {
615 struct parport_uss720_private *priv = pp->private_data;
616 struct usb_device *usbdev = priv->usbdev;
617 int rlen = 0;
618 int i;
619
620 if (!usbdev)
621 return 0;
622 if (change_mode(pp, ECR_PPF))
623 return 0;
624 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
625 if (i)
626 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen);
627 change_mode(pp, ECR_PS2);
628 return rlen;
629 }
630
631 /* --------------------------------------------------------------------- */
632
633 static struct parport_operations parport_uss720_ops =
634 {
635 .owner = THIS_MODULE,
636 .write_data = parport_uss720_write_data,
637 .read_data = parport_uss720_read_data,
638
639 .write_control = parport_uss720_write_control,
640 .read_control = parport_uss720_read_control,
641 .frob_control = parport_uss720_frob_control,
642
643 .read_status = parport_uss720_read_status,
644
645 .enable_irq = parport_uss720_enable_irq,
646 .disable_irq = parport_uss720_disable_irq,
647
648 .data_forward = parport_uss720_data_forward,
649 .data_reverse = parport_uss720_data_reverse,
650
651 .init_state = parport_uss720_init_state,
652 .save_state = parport_uss720_save_state,
653 .restore_state = parport_uss720_restore_state,
654
655 .epp_write_data = parport_uss720_epp_write_data,
656 .epp_read_data = parport_uss720_epp_read_data,
657 .epp_write_addr = parport_uss720_epp_write_addr,
658 .epp_read_addr = parport_uss720_epp_read_addr,
659
660 .ecp_write_data = parport_uss720_ecp_write_data,
661 .ecp_read_data = parport_uss720_ecp_read_data,
662 .ecp_write_addr = parport_uss720_ecp_write_addr,
663
664 .compat_write_data = parport_uss720_write_compat,
665 .nibble_read_data = parport_ieee1284_read_nibble,
666 .byte_read_data = parport_ieee1284_read_byte,
667 };
668
669 /* --------------------------------------------------------------------- */
670
uss720_probe(struct usb_interface * intf,const struct usb_device_id * id)671 static int uss720_probe(struct usb_interface *intf,
672 const struct usb_device_id *id)
673 {
674 struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
675 struct usb_host_interface *interface;
676 struct usb_endpoint_descriptor *epd;
677 struct parport_uss720_private *priv;
678 struct parport *pp;
679 unsigned char reg;
680 int i;
681
682 dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n",
683 le16_to_cpu(usbdev->descriptor.idVendor),
684 le16_to_cpu(usbdev->descriptor.idProduct));
685
686 /* our known interfaces have 3 alternate settings */
687 if (intf->num_altsetting != 3) {
688 usb_put_dev(usbdev);
689 return -ENODEV;
690 }
691 i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
692 dev_dbg(&intf->dev, "set interface result %d\n", i);
693
694 interface = intf->cur_altsetting;
695
696 if (interface->desc.bNumEndpoints < 3) {
697 usb_put_dev(usbdev);
698 return -ENODEV;
699 }
700
701 /*
702 * Allocate parport interface
703 */
704 priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL);
705 if (!priv) {
706 usb_put_dev(usbdev);
707 return -ENOMEM;
708 }
709 priv->pp = NULL;
710 priv->usbdev = usbdev;
711 kref_init(&priv->ref_count);
712 spin_lock_init(&priv->asynclock);
713 INIT_LIST_HEAD(&priv->asynclist);
714 pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops);
715 if (!pp) {
716 printk(KERN_WARNING "uss720: could not register parport\n");
717 goto probe_abort;
718 }
719
720 priv->pp = pp;
721 pp->private_data = priv;
722 pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
723
724 /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
725 set_1284_register(pp, 7, 0x00, GFP_KERNEL);
726 set_1284_register(pp, 6, 0x30, GFP_KERNEL); /* PS/2 mode */
727 set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
728 /* debugging */
729 get_1284_register(pp, 0, ®, GFP_KERNEL);
730 dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg);
731
732 i = usb_find_last_int_in_endpoint(interface, &epd);
733 if (!i) {
734 dev_dbg(&intf->dev, "epaddr %d interval %d\n",
735 epd->bEndpointAddress, epd->bInterval);
736 }
737 parport_announce_port(pp);
738
739 usb_set_intfdata(intf, pp);
740 return 0;
741
742 probe_abort:
743 kill_all_async_requests_priv(priv);
744 kref_put(&priv->ref_count, destroy_priv);
745 return -ENODEV;
746 }
747
uss720_disconnect(struct usb_interface * intf)748 static void uss720_disconnect(struct usb_interface *intf)
749 {
750 struct parport *pp = usb_get_intfdata(intf);
751 struct parport_uss720_private *priv;
752
753 dev_dbg(&intf->dev, "disconnect\n");
754 usb_set_intfdata(intf, NULL);
755 if (pp) {
756 priv = pp->private_data;
757 priv->pp = NULL;
758 dev_dbg(&intf->dev, "parport_remove_port\n");
759 parport_remove_port(pp);
760 parport_put_port(pp);
761 kill_all_async_requests_priv(priv);
762 kref_put(&priv->ref_count, destroy_priv);
763 }
764 dev_dbg(&intf->dev, "disconnect done\n");
765 }
766
767 /* table of cables that work through this driver */
768 static const struct usb_device_id uss720_table[] = {
769 { USB_DEVICE(0x047e, 0x1001) },
770 { USB_DEVICE(0x04b8, 0x0002) },
771 { USB_DEVICE(0x04b8, 0x0003) },
772 { USB_DEVICE(0x050d, 0x0002) },
773 { USB_DEVICE(0x050d, 0x1202) },
774 { USB_DEVICE(0x0557, 0x2001) },
775 { USB_DEVICE(0x05ab, 0x0002) },
776 { USB_DEVICE(0x06c6, 0x0100) },
777 { USB_DEVICE(0x0729, 0x1284) },
778 { USB_DEVICE(0x1293, 0x0002) },
779 { } /* Terminating entry */
780 };
781
782 MODULE_DEVICE_TABLE (usb, uss720_table);
783
784
785 static struct usb_driver uss720_driver = {
786 .name = "uss720",
787 .probe = uss720_probe,
788 .disconnect = uss720_disconnect,
789 .id_table = uss720_table,
790 };
791
792 /* --------------------------------------------------------------------- */
793
794 MODULE_AUTHOR(DRIVER_AUTHOR);
795 MODULE_DESCRIPTION(DRIVER_DESC);
796 MODULE_LICENSE("GPL");
797
uss720_init(void)798 static int __init uss720_init(void)
799 {
800 int retval;
801 retval = usb_register(&uss720_driver);
802 if (retval)
803 goto out;
804
805 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
806 printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose "
807 "driver to allow nonstandard\n");
808 printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over "
809 "USS720 usb to parallel cables\n");
810 printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a "
811 "printer, use usblp instead\n");
812 out:
813 return retval;
814 }
815
uss720_cleanup(void)816 static void __exit uss720_cleanup(void)
817 {
818 usb_deregister(&uss720_driver);
819 }
820
821 module_init(uss720_init);
822 module_exit(uss720_cleanup);
823
824 /* --------------------------------------------------------------------- */
825
