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Linux/drivers/usb/misc/uss720.c

  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 
 63 struct 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 
 72 struct 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 
 84 static 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 
 93 static 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 
111 static void async_complete(struct urb *urb)
112 {
113         struct uss720_async_request *rq;
114         struct parport *pp;
115         struct parport_uss720_private *priv;
116         int status = urb->status;
117 
118         rq = urb->context;
119         priv = rq->priv;
120         pp = priv->pp;
121         if (status) {
122                 dev_err(&urb->dev->dev, "async_complete: urb error %d\n",
123                         status);
124         } else if (rq->dr->bRequest == 3) {
125                 memcpy(priv->reg, rq->reg, sizeof(priv->reg));
126 #if 0
127                 dev_dbg(&priv->usbdev->dev,
128                         "async_complete regs %02x %02x %02x %02x %02x %02x %02x\n",
129                         (unsigned int)priv->reg[0], (unsigned int)priv->reg[1],
130                         (unsigned int)priv->reg[2], (unsigned int)priv->reg[3],
131                         (unsigned int)priv->reg[4], (unsigned int)priv->reg[5],
132                         (unsigned int)priv->reg[6]);
133 #endif
134                 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
135                 if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
136                         parport_generic_irq(pp);
137         }
138         complete(&rq->compl);
139         kref_put(&rq->ref_count, destroy_async);
140 }
141 
142 static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
143                                                          __u8 request, __u8 requesttype, __u16 value, __u16 index,
144                                                          gfp_t mem_flags)
145 {
146         struct usb_device *usbdev;
147         struct uss720_async_request *rq;
148         unsigned long flags;
149         int ret;
150 
151         if (!priv)
152                 return NULL;
153         usbdev = priv->usbdev;
154         if (!usbdev)
155                 return NULL;
156         rq = kzalloc(sizeof(struct uss720_async_request), mem_flags);
157         if (!rq) {
158                 dev_err(&usbdev->dev, "submit_async_request out of memory\n");
159                 return NULL;
160         }
161         kref_init(&rq->ref_count);
162         INIT_LIST_HEAD(&rq->asynclist);
163         init_completion(&rq->compl);
164         kref_get(&priv->ref_count);
165         rq->priv = priv;
166         rq->urb = usb_alloc_urb(0, mem_flags);
167         if (!rq->urb) {
168                 kref_put(&rq->ref_count, destroy_async);
169                 dev_err(&usbdev->dev, "submit_async_request out of memory\n");
170                 return NULL;
171         }
172         rq->dr = kmalloc(sizeof(*rq->dr), mem_flags);
173         if (!rq->dr) {
174                 kref_put(&rq->ref_count, destroy_async);
175                 return NULL;
176         }
177         rq->dr->bRequestType = requesttype;
178         rq->dr->bRequest = request;
179         rq->dr->wValue = cpu_to_le16(value);
180         rq->dr->wIndex = cpu_to_le16(index);
181         rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
182         usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
183                              (unsigned char *)rq->dr,
184                              (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
185         /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
186         spin_lock_irqsave(&priv->asynclock, flags);
187         list_add_tail(&rq->asynclist, &priv->asynclist);
188         spin_unlock_irqrestore(&priv->asynclock, flags);
189         kref_get(&rq->ref_count);
190         ret = usb_submit_urb(rq->urb, mem_flags);
191         if (!ret)
192                 return rq;
193         destroy_async(&rq->ref_count);
194         dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
195         return NULL;
196 }
197 
198 static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
199 {
200         struct uss720_async_request *rq;
201         unsigned long flags;
202         unsigned int ret = 0;
203 
204         spin_lock_irqsave(&priv->asynclock, flags);
205         list_for_each_entry(rq, &priv->asynclist, asynclist) {
206                 usb_unlink_urb(rq->urb);
207                 ret++;
208         }
209         spin_unlock_irqrestore(&priv->asynclock, flags);
210         return ret;
211 }
212 
213 /* --------------------------------------------------------------------- */
214 
215 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
216 {
217         struct parport_uss720_private *priv;
218         struct uss720_async_request *rq;
219         static const unsigned char regindex[9] = {
220                 4, 0, 1, 5, 5, 0, 2, 3, 6
221         };
222         int ret;
223 
224         if (!pp)
225                 return -EIO;
226         priv = pp->private_data;
227         rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
228         if (!rq) {
229                 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
230                         (unsigned int)reg);
231                 return -EIO;
232         }
233         if (!val) {
234                 kref_put(&rq->ref_count, destroy_async);
235                 return 0;
236         }
237         if (wait_for_completion_timeout(&rq->compl, HZ)) {
238                 ret = rq->urb->status;
239                 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
240                 if (ret)
241                         printk(KERN_WARNING "get_1284_register: "
242                                "usb error %d\n", ret);
243                 kref_put(&rq->ref_count, destroy_async);
244                 return ret;
245         }
246         printk(KERN_WARNING "get_1284_register timeout\n");
247         kill_all_async_requests_priv(priv);
248         return -EIO;
249 }
250 
251 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
252 {
253         struct parport_uss720_private *priv;
254         struct uss720_async_request *rq;
255 
256         if (!pp)
257                 return -EIO;
258         priv = pp->private_data;
259         rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
260         if (!rq) {
261                 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
262                         (unsigned int)reg, (unsigned int)val);
263                 return -EIO;
264         }
265         kref_put(&rq->ref_count, destroy_async);
266         return 0;
267 }
268 
269 /* --------------------------------------------------------------------- */
270 
271 /* ECR modes */
272 #define ECR_SPP 00
273 #define ECR_PS2 01
274 #define ECR_PPF 02
275 #define ECR_ECP 03
276 #define ECR_EPP 04
277 
278 /* Safely change the mode bits in the ECR */
279 static int change_mode(struct parport *pp, int m)
280 {
281         struct parport_uss720_private *priv = pp->private_data;
282         int mode;
283         __u8 reg;
284 
285         if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
286                 return -EIO;
287         /* Bits <7:5> contain the mode. */
288         mode = (priv->reg[2] >> 5) & 0x7;
289         if (mode == m)
290                 return 0;
291         /* We have to go through mode 000 or 001 */
292         if (mode > ECR_PS2 && m > ECR_PS2)
293                 if (change_mode(pp, ECR_PS2))
294                         return -EIO;
295 
296         if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
297                 /* This mode resets the FIFO, so we may
298                  * have to wait for it to drain first. */
299                 unsigned long expire = jiffies + pp->physport->cad->timeout;
300                 switch (mode) {
301                 case ECR_PPF: /* Parallel Port FIFO mode */
302                 case ECR_ECP: /* ECP Parallel Port mode */
303                         /* Poll slowly. */
304                         for (;;) {
305                                 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
306                                         return -EIO;
307                                 if (priv->reg[2] & 0x01)
308                                         break;
309                                 if (time_after_eq (jiffies, expire))
310                                         /* The FIFO is stuck. */
311                                         return -EBUSY;
312                                 msleep_interruptible(10);
313                                 if (signal_pending (current))
314                                         break;
315                         }
316                 }
317         }
318         /* Set the mode. */
319         if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
320                 return -EIO;
321         if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
322                 return -EIO;
323         return 0;
324 }
325 
326 /*
327  * Clear TIMEOUT BIT in EPP MODE
328  */
329 static int clear_epp_timeout(struct parport *pp)
330 {
331         unsigned char stat;
332 
333         if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
334                 return 1;
335         return stat & 1;
336 }
337 
338 /*
339  * Access functions.
340  */
341 #if 0
342 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
343 {
344         struct parport *pp = (struct parport *)dev_id;
345         struct parport_uss720_private *priv = pp->private_data; 
346 
347         if (usbstatus != 0 || len < 4 || !buffer)
348                 return 1;
349         memcpy(priv->reg, buffer, 4);
350         /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
351         if (priv->reg[2] & priv->reg[1] & 0x10)
352                 parport_generic_irq(pp);
353         return 1;
354 }
355 #endif
356 
357 static void parport_uss720_write_data(struct parport *pp, unsigned char d)
358 {
359         set_1284_register(pp, 0, d, GFP_KERNEL);
360 }
361 
362 static unsigned char parport_uss720_read_data(struct parport *pp)
363 {
364         unsigned char ret;
365 
366         if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
367                 return 0;
368         return ret;
369 }
370 
371 static void parport_uss720_write_control(struct parport *pp, unsigned char d)
372 {
373         struct parport_uss720_private *priv = pp->private_data; 
374 
375         d = (d & 0xf) | (priv->reg[1] & 0xf0);
376         if (set_1284_register(pp, 2, d, GFP_KERNEL))
377                 return;
378         priv->reg[1] = d;
379 }
380 
381 static 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 
387 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
388 {
389         struct parport_uss720_private *priv = pp->private_data; 
390         unsigned char d;
391 
392         mask &= 0x0f;
393         val &= 0x0f;
394         d = (priv->reg[1] & (~mask)) ^ val;
395         if (set_1284_register(pp, 2, d, GFP_KERNEL))
396                 return 0;
397         priv->reg[1] = d;
398         return d & 0xf;
399 }
400 
401 static unsigned char parport_uss720_read_status(struct parport *pp)
402 {
403         unsigned char ret;
404 
405         if (get_1284_register(pp, 1, &ret, GFP_KERNEL))
406                 return 0;
407         return ret & 0xf8;
408 }
409 
410 static void parport_uss720_disable_irq(struct parport *pp)
411 {
412         struct parport_uss720_private *priv = pp->private_data; 
413         unsigned char d;
414 
415         d = priv->reg[1] & ~0x10;
416         if (set_1284_register(pp, 2, d, GFP_KERNEL))
417                 return;
418         priv->reg[1] = d;
419 }
420 
421 static void parport_uss720_enable_irq(struct parport *pp)
422 {
423         struct parport_uss720_private *priv = pp->private_data; 
424         unsigned char d;
425 
426         d = priv->reg[1] | 0x10;
427         if (set_1284_register(pp, 2, d, GFP_KERNEL))
428                 return;
429         priv->reg[1] = d;
430 }
431 
432 static void parport_uss720_data_forward (struct parport *pp)
433 {
434         struct parport_uss720_private *priv = pp->private_data; 
435         unsigned char d;
436 
437         d = priv->reg[1] & ~0x20;
438         if (set_1284_register(pp, 2, d, GFP_KERNEL))
439                 return;
440         priv->reg[1] = d;
441 }
442 
443 static void parport_uss720_data_reverse (struct parport *pp)
444 {
445         struct parport_uss720_private *priv = pp->private_data; 
446         unsigned char d;
447 
448         d = priv->reg[1] | 0x20;
449         if (set_1284_register(pp, 2, d, GFP_KERNEL))
450                 return;
451         priv->reg[1] = d;
452 }
453 
454 static 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 
460 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
461 {
462         struct parport_uss720_private *priv = pp->private_data; 
463 
464 #if 0
465         if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
466                 return;
467 #endif
468         s->u.pc.ctr = priv->reg[1];
469         s->u.pc.ecr = priv->reg[2];
470 }
471 
472 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
473 {
474         struct parport_uss720_private *priv = pp->private_data;
475 
476         set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
477         set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
478         get_1284_register(pp, 2, NULL, GFP_ATOMIC);
479         priv->reg[1] = s->u.pc.ctr;
480         priv->reg[2] = s->u.pc.ecr;
481 }
482 
483 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
484 {
485         struct parport_uss720_private *priv = pp->private_data; 
486         size_t got = 0;
487 
488         if (change_mode(pp, ECR_EPP))
489                 return 0;
490         for (; got < length; got++) {
491                 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
492                         break;
493                 buf++;
494                 if (priv->reg[0] & 0x01) {
495                         clear_epp_timeout(pp);
496                         break;
497                 }
498         }
499         change_mode(pp, ECR_PS2);
500         return got;
501 }
502 
503 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
504 {
505 #if 0
506         struct parport_uss720_private *priv = pp->private_data; 
507         size_t written = 0;
508 
509         if (change_mode(pp, ECR_EPP))
510                 return 0;
511         for (; written < length; written++) {
512                 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
513                         break;
514                 ((char*)buf)++;
515                 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
516                         break;
517                 if (priv->reg[0] & 0x01) {
518                         clear_epp_timeout(pp);
519                         break;
520                 }
521         }
522         change_mode(pp, ECR_PS2);
523         return written;
524 #else
525         struct parport_uss720_private *priv = pp->private_data;
526         struct usb_device *usbdev = priv->usbdev;
527         int rlen;
528         int i;
529 
530         if (!usbdev)
531                 return 0;
532         if (change_mode(pp, ECR_EPP))
533                 return 0;
534         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
535         if (i)
536                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buf, length, rlen);
537         change_mode(pp, ECR_PS2);
538         return rlen;
539 #endif
540 }
541 
542 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
543 {
544         struct parport_uss720_private *priv = pp->private_data; 
545         size_t got = 0;
546 
547         if (change_mode(pp, ECR_EPP))
548                 return 0;
549         for (; got < length; got++) {
550                 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
551                         break;
552                 buf++;
553                 if (priv->reg[0] & 0x01) {
554                         clear_epp_timeout(pp);
555                         break;
556                 }
557         }
558         change_mode(pp, ECR_PS2);
559         return got;
560 }
561 
562 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
563 {
564         struct parport_uss720_private *priv = pp->private_data; 
565         size_t written = 0;
566 
567         if (change_mode(pp, ECR_EPP))
568                 return 0;
569         for (; written < length; written++) {
570                 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
571                         break;
572                 buf++;
573                 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
574                         break;
575                 if (priv->reg[0] & 0x01) {
576                         clear_epp_timeout(pp);
577                         break;
578                 }
579         }
580         change_mode(pp, ECR_PS2);
581         return written;
582 }
583 
584 static 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 
602 static 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 
620 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
621 {
622         size_t written = 0;
623 
624         if (change_mode(pp, ECR_ECP))
625                 return 0;
626         for (; written < len; written++) {
627                 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
628                         break;
629                 buffer++;
630         }
631         change_mode(pp, ECR_PS2);
632         return written;
633 }
634 
635 static 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 
655 static 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 
693 static int uss720_probe(struct usb_interface *intf,
694                         const struct usb_device_id *id)
695 {
696         struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
697         struct usb_host_interface *interface;
698         struct usb_host_endpoint *endpoint;
699         struct parport_uss720_private *priv;
700         struct parport *pp;
701         unsigned char reg;
702         int i;
703 
704         dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n",
705                 le16_to_cpu(usbdev->descriptor.idVendor),
706                 le16_to_cpu(usbdev->descriptor.idProduct));
707 
708         /* our known interfaces have 3 alternate settings */
709         if (intf->num_altsetting != 3) {
710                 usb_put_dev(usbdev);
711                 return -ENODEV;
712         }
713         i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
714         dev_dbg(&intf->dev, "set interface result %d\n", i);
715 
716         interface = intf->cur_altsetting;
717 
718         /*
719          * Allocate parport interface 
720          */
721         if (!(priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL))) {
722                 usb_put_dev(usbdev);
723                 return -ENOMEM;
724         }
725         priv->pp = NULL;
726         priv->usbdev = usbdev;
727         kref_init(&priv->ref_count);
728         spin_lock_init(&priv->asynclock);
729         INIT_LIST_HEAD(&priv->asynclist);
730         if (!(pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops))) {
731                 printk(KERN_WARNING "uss720: could not register parport\n");
732                 goto probe_abort;
733         }
734 
735         priv->pp = pp;
736         pp->private_data = priv;
737         pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
738 
739         /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
740         set_1284_register(pp, 7, 0x00, GFP_KERNEL);
741         set_1284_register(pp, 6, 0x30, GFP_KERNEL);  /* PS/2 mode */
742         set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
743         /* debugging */
744         get_1284_register(pp, 0, &reg, GFP_KERNEL);
745         dev_dbg(&intf->dev, "reg: %02x %02x %02x %02x %02x %02x %02x\n",
746                 priv->reg[0], priv->reg[1], priv->reg[2], priv->reg[3],
747                 priv->reg[4], priv->reg[5], priv->reg[6]);
748 
749         endpoint = &interface->endpoint[2];
750         dev_dbg(&intf->dev, "epaddr %d interval %d\n",
751                 endpoint->desc.bEndpointAddress, endpoint->desc.bInterval);
752         parport_announce_port(pp);
753 
754         usb_set_intfdata(intf, pp);
755         return 0;
756 
757 probe_abort:
758         kill_all_async_requests_priv(priv);
759         kref_put(&priv->ref_count, destroy_priv);
760         return -ENODEV;
761 }
762 
763 static void uss720_disconnect(struct usb_interface *intf)
764 {
765         struct parport *pp = usb_get_intfdata(intf);
766         struct parport_uss720_private *priv;
767         struct usb_device *usbdev;
768 
769         dev_dbg(&intf->dev, "disconnect\n");
770         usb_set_intfdata(intf, NULL);
771         if (pp) {
772                 priv = pp->private_data;
773                 usbdev = priv->usbdev;
774                 priv->usbdev = NULL;
775                 priv->pp = NULL;
776                 dev_dbg(&intf->dev, "parport_remove_port\n");
777                 parport_remove_port(pp);
778                 parport_put_port(pp);
779                 kill_all_async_requests_priv(priv);
780                 kref_put(&priv->ref_count, destroy_priv);
781         }
782         dev_dbg(&intf->dev, "disconnect done\n");
783 }
784 
785 /* table of cables that work through this driver */
786 static const struct usb_device_id uss720_table[] = {
787         { USB_DEVICE(0x047e, 0x1001) },
788         { USB_DEVICE(0x0557, 0x2001) },
789         { USB_DEVICE(0x0729, 0x1284) },
790         { USB_DEVICE(0x1293, 0x0002) },
791         { USB_DEVICE(0x050d, 0x0002) },
792         { }                                             /* Terminating entry */
793 };
794 
795 MODULE_DEVICE_TABLE (usb, uss720_table);
796 
797 
798 static struct usb_driver uss720_driver = {
799         .name =         "uss720",
800         .probe =        uss720_probe,
801         .disconnect =   uss720_disconnect,
802         .id_table =     uss720_table,
803 };
804 
805 /* --------------------------------------------------------------------- */
806 
807 MODULE_AUTHOR(DRIVER_AUTHOR);
808 MODULE_DESCRIPTION(DRIVER_DESC);
809 MODULE_LICENSE("GPL");
810 
811 static int __init uss720_init(void)
812 {
813         int retval;
814         retval = usb_register(&uss720_driver);
815         if (retval)
816                 goto out;
817 
818         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
819                DRIVER_DESC "\n");
820         printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose "
821                "driver to allow nonstandard\n");
822         printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over "
823                "USS720 usb to parallel cables\n");
824         printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a "
825                "printer, use usblp instead\n");
826 out:
827         return retval;
828 }
829 
830 static void __exit uss720_cleanup(void)
831 {
832         usb_deregister(&uss720_driver);
833 }
834 
835 module_init(uss720_init);
836 module_exit(uss720_cleanup);
837 
838 /* --------------------------------------------------------------------- */
839 

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