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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, "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 
138 static 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 
194 static 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 
211 static 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 
247 static 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 */
275 static 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, &reg, 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, &reg, 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, &reg, GFP_KERNEL))
318                 return -EIO;
319         return 0;
320 }
321 
322 /*
323  * Clear TIMEOUT BIT in EPP MODE
324  */
325 static 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
338 static 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 
353 static void parport_uss720_write_data(struct parport *pp, unsigned char d)
354 {
355         set_1284_register(pp, 0, d, GFP_KERNEL);
356 }
357 
358 static 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 
367 static 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 
377 static 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 
383 static 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 
397 static 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 
406 static 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 
417 static 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 
428 static 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 
439 static 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 
450 static 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 
456 static 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 
468 static 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 
479 static 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 
499 static 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 
538 static 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 
558 static 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 
580 static 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 
598 static 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 
616 static 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 
631 static 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 
651 static 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 
689 static 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         if (!(priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL))) {
718                 usb_put_dev(usbdev);
719                 return -ENOMEM;
720         }
721         priv->pp = NULL;
722         priv->usbdev = usbdev;
723         kref_init(&priv->ref_count);
724         spin_lock_init(&priv->asynclock);
725         INIT_LIST_HEAD(&priv->asynclist);
726         if (!(pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops))) {
727                 printk(KERN_WARNING "uss720: could not register parport\n");
728                 goto probe_abort;
729         }
730 
731         priv->pp = pp;
732         pp->private_data = priv;
733         pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
734 
735         /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
736         set_1284_register(pp, 7, 0x00, GFP_KERNEL);
737         set_1284_register(pp, 6, 0x30, GFP_KERNEL);  /* PS/2 mode */
738         set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
739         /* debugging */
740         get_1284_register(pp, 0, &reg, GFP_KERNEL);
741         dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg);
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 
751 probe_abort:
752         kill_all_async_requests_priv(priv);
753         kref_put(&priv->ref_count, destroy_priv);
754         return -ENODEV;
755 }
756 
757 static 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 */
780 static 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 
789 MODULE_DEVICE_TABLE (usb, uss720_table);
790 
791 
792 static 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 
801 MODULE_AUTHOR(DRIVER_AUTHOR);
802 MODULE_DESCRIPTION(DRIVER_DESC);
803 MODULE_LICENSE("GPL");
804 
805 static 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");
820 out:
821         return retval;
822 }
823 
824 static void __exit uss720_cleanup(void)
825 {
826         usb_deregister(&uss720_driver);
827 }
828 
829 module_init(uss720_init);
830 module_exit(uss720_cleanup);
831 
832 /* --------------------------------------------------------------------- */
833 

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