drivers/usb/misc/uss720.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      uss720.c  --  USS720 USB Parport Cable.
   5  *
   6  *      Copyright (C) 1999, 2005
   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
  53 /*
  54  * Version Information
  55  */
  56 #define DRIVER_VERSION "v0.6"
  57 #define DRIVER_AUTHOR "Thomas M. Sailer, t.sailer@alumni.ethz.ch"
  58 #define DRIVER_DESC "USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip"
  59
  60 /* --------------------------------------------------------------------- */
  61
  62 struct parport_uss720_private {
  63         struct usb_device *usbdev;
  64         struct parport *pp;
  65         struct kref ref_count;
  66         __u8 reg[7];  /* USB registers */
  67         struct list_head asynclist;
  68         spinlock_t asynclock;
  69 };
  70
  71 struct uss720_async_request {
  72         struct parport_uss720_private *priv;
  73         struct kref ref_count;
  74         struct list_head asynclist;
  75         struct completion compl;
  76         struct urb *urb;
  77         struct usb_ctrlrequest dr;
  78         __u8 reg[7];
  79 };
  80
  81 /* --------------------------------------------------------------------- */
  82
  83 static void destroy_priv(struct kref *kref)
  84 {
  85         struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count);
  86
  87         usb_put_dev(priv->usbdev);
  88         kfree(priv);
  89         dbg("destroying priv datastructure");
  90 }
  91
  92 static void destroy_async(struct kref *kref)
  93 {
  94         struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count);
  95         struct parport_uss720_private *priv = rq->priv;
  96         unsigned long flags;
  97
  98         if (likely(rq->urb))
  99                 usb_free_urb(rq->urb);
 100         spin_lock_irqsave(&priv->asynclock, flags);
 101         list_del_init(&rq->asynclist);
 102         spin_unlock_irqrestore(&priv->asynclock, flags);
 103         kfree(rq);
 104         kref_put(&priv->ref_count, destroy_priv);
 105 }
 106
 107 /* --------------------------------------------------------------------- */
 108
 109 static void async_complete(struct urb *urb)
 110 {
 111         struct uss720_async_request *rq;
 112         struct parport *pp;
 113         struct parport_uss720_private *priv;
 114         int status = urb->status;
 115
 116         rq = urb->context;
 117         priv = rq->priv;
 118         pp = priv->pp;
 119         if (status) {
 120                 err("async_complete: urb error %d", status);
 121         } else if (rq->dr.bRequest == 3) {
 122                 memcpy(priv->reg, rq->reg, sizeof(priv->reg));
 123 #if 0
 124                 dbg("async_complete regs %02x %02x %02x %02x %02x %02x %02x",
 125                     (unsigned int)priv->reg[0], (unsigned int)priv->reg[1], (unsigned int)priv->reg[2],
 126                     (unsigned int)priv->reg[3], (unsigned int)priv->reg[4], (unsigned int)priv->reg[5],
 127                     (unsigned int)priv->reg[6]);
 128 #endif
 129                 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
 130                 if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
 131                         parport_generic_irq(pp);
 132         }
 133         complete(&rq->compl);
 134         kref_put(&rq->ref_count, destroy_async);
 135 }
 136
 137 static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
 138                                                          __u8 request, __u8 requesttype, __u16 value, __u16 index,
 139                                                          gfp_t mem_flags)
 140 {
 141         struct usb_device *usbdev;
 142         struct uss720_async_request *rq;
 143         unsigned long flags;
 144         int ret;
 145
 146         if (!priv)
 147                 return NULL;
 148         usbdev = priv->usbdev;
 149         if (!usbdev)
 150                 return NULL;
 151         rq = kmalloc(sizeof(struct uss720_async_request), mem_flags);
 152         if (!rq) {
 153                 err("submit_async_request out of memory");
 154                 return NULL;
 155         }
 156         kref_init(&rq->ref_count);
 157         INIT_LIST_HEAD(&rq->asynclist);
 158         init_completion(&rq->compl);
 159         kref_get(&priv->ref_count);
 160         rq->priv = priv;
 161         rq->urb = usb_alloc_urb(0, mem_flags);
 162         if (!rq->urb) {
 163                 kref_put(&rq->ref_count, destroy_async);
 164                 err("submit_async_request out of memory");
 165                 return NULL;
 166         }
 167         rq->dr.bRequestType = requesttype;
 168         rq->dr.bRequest = request;
 169         rq->dr.wValue = cpu_to_le16(value);
 170         rq->dr.wIndex = cpu_to_le16(index);
 171         rq->dr.wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
 172         usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
 173                              (unsigned char *)&rq->dr,
 174                              (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
 175         /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
 176         spin_lock_irqsave(&priv->asynclock, flags);
 177         list_add_tail(&rq->asynclist, &priv->asynclist);
 178         spin_unlock_irqrestore(&priv->asynclock, flags);
 179         ret = usb_submit_urb(rq->urb, mem_flags);
 180         if (!ret) {
 181                 kref_get(&rq->ref_count);
 182                 return rq;
 183         }
 184         kref_put(&rq->ref_count, destroy_async);
 185         err("submit_async_request submit_urb failed with %d", ret);
 186         return NULL;
 187 }
 188
 189 static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
 190 {
 191         struct uss720_async_request *rq;
 192         unsigned long flags;
 193         unsigned int ret = 0;
 194
 195         spin_lock_irqsave(&priv->asynclock, flags);
 196         list_for_each_entry(rq, &priv->asynclist, asynclist) {
 197                 usb_unlink_urb(rq->urb);
 198                 ret++;
 199         }
 200         spin_unlock_irqrestore(&priv->asynclock, flags);
 201         return ret;
 202 }
 203
 204 /* --------------------------------------------------------------------- */
 205
 206 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
 207 {
 208         struct parport_uss720_private *priv;
 209         struct uss720_async_request *rq;
 210         static const unsigned char regindex[9] = {
 211                 4, 0, 1, 5, 5, 0, 2, 3, 6
 212         };
 213         int ret;
 214
 215         if (!pp)
 216                 return -EIO;
 217         priv = pp->private_data;
 218         rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
 219         if (!rq) {
 220                 err("get_1284_register(%u) failed", (unsigned int)reg);
 221                 return -EIO;
 222         }
 223         if (!val) {
 224                 kref_put(&rq->ref_count, destroy_async);
 225                 return 0;
 226         }
 227         if (wait_for_completion_timeout(&rq->compl, HZ)) {
 228                 ret = rq->urb->status;
 229                 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
 230                 if (ret)
 231                         warn("get_1284_register: usb error %d", ret);
 232                 kref_put(&rq->ref_count, destroy_async);
 233                 return ret;
 234         }
 235         warn("get_1284_register timeout");
 236         kill_all_async_requests_priv(priv);
 237         return -EIO;
 238 }
 239
 240 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
 241 {
 242         struct parport_uss720_private *priv;
 243         struct uss720_async_request *rq;
 244
 245         if (!pp)
 246                 return -EIO;
 247         priv = pp->private_data;
 248         rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
 249         if (!rq) {
 250                 err("set_1284_register(%u,%u) failed", (unsigned int)reg, (unsigned int)val);
 251                 return -EIO;
 252         }
 253         kref_put(&rq->ref_count, destroy_async);
 254         return 0;
 255 }
 256
 257 /* --------------------------------------------------------------------- */
 258
 259 /* ECR modes */
 260 #define ECR_SPP 00
 261 #define ECR_PS2 01
 262 #define ECR_PPF 02
 263 #define ECR_ECP 03
 264 #define ECR_EPP 04
 265
 266 /* Safely change the mode bits in the ECR */
 267 static int change_mode(struct parport *pp, int m)
 268 {
 269         struct parport_uss720_private *priv = pp->private_data;
 270         int mode;
 271         __u8 reg;
 272
 273         if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 274                 return -EIO;
 275         /* Bits <7:5> contain the mode. */
 276         mode = (priv->reg[2] >> 5) & 0x7;
 277         if (mode == m)
 278                 return 0;
 279         /* We have to go through mode 000 or 001 */
 280         if (mode > ECR_PS2 && m > ECR_PS2)
 281                 if (change_mode(pp, ECR_PS2))
 282                         return -EIO;
 283
 284         if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
 285                 /* This mode resets the FIFO, so we may
 286                  * have to wait for it to drain first. */
 287                 unsigned long expire = jiffies + pp->physport->cad->timeout;
 288                 switch (mode) {
 289                 case ECR_PPF: /* Parallel Port FIFO mode */
 290                 case ECR_ECP: /* ECP Parallel Port mode */
 291                         /* Poll slowly. */
 292                         for (;;) {
 293                                 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 294                                         return -EIO;
 295                                 if (priv->reg[2] & 0x01)
 296                                         break;
 297                                 if (time_after_eq (jiffies, expire))
 298                                         /* The FIFO is stuck. */
 299                                         return -EBUSY;
 300                                 msleep_interruptible(10);
 301                                 if (signal_pending (current))
 302                                         break;
 303                         }
 304                 }
 305         }
 306         /* Set the mode. */
 307         if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
 308                 return -EIO;
 309         if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 310                 return -EIO;
 311         return 0;
 312 }
 313
 314 /*
 315  * Clear TIMEOUT BIT in EPP MODE
 316  */
 317 static int clear_epp_timeout(struct parport *pp)
 318 {
 319         unsigned char stat;
 320
 321         if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
 322                 return 1;
 323         return stat & 1;
 324 }
 325
 326 /*
 327  * Access functions.
 328  */
 329 #if 0
 330 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
 331 {
 332         struct parport *pp = (struct parport *)dev_id;
 333         struct parport_uss720_private *priv = pp->private_data;
 334
 335         if (usbstatus != 0 || len < 4 || !buffer)
 336                 return 1;
 337         memcpy(priv->reg, buffer, 4);
 338         /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
 339         if (priv->reg[2] & priv->reg[1] & 0x10)
 340                 parport_generic_irq(pp);
 341         return 1;
 342 }
 343 #endif
 344
 345 static void parport_uss720_write_data(struct parport *pp, unsigned char d)
 346 {
 347         set_1284_register(pp, 0, d, GFP_KERNEL);
 348 }
 349
 350 static unsigned char parport_uss720_read_data(struct parport *pp)
 351 {
 352         unsigned char ret;
 353
 354         if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
 355                 return 0;
 356         return ret;
 357 }
 358
 359 static void parport_uss720_write_control(struct parport *pp, unsigned char d)
 360 {
 361         struct parport_uss720_private *priv = pp->private_data;
 362
 363         d = (d & 0xf) | (priv->reg[1] & 0xf0);
 364         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 365                 return;
 366         priv->reg[1] = d;
 367 }
 368
 369 static unsigned char parport_uss720_read_control(struct parport *pp)
 370 {
 371         struct parport_uss720_private *priv = pp->private_data;
 372         return priv->reg[1] & 0xf; /* Use soft copy */
 373 }
 374
 375 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
 376 {
 377         struct parport_uss720_private *priv = pp->private_data;
 378         unsigned char d;
 379
 380         mask &= 0x0f;
 381         val &= 0x0f;
 382         d = (priv->reg[1] & (~mask)) ^ val;
 383         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 384                 return 0;
 385         priv->reg[1] = d;
 386         return d & 0xf;
 387 }
 388
 389 static unsigned char parport_uss720_read_status(struct parport *pp)
 390 {
 391         unsigned char ret;
 392
 393         if (get_1284_register(pp, 1, &ret, GFP_KERNEL))
 394                 return 0;
 395         return ret & 0xf8;
 396 }
 397
 398 static void parport_uss720_disable_irq(struct parport *pp)
 399 {
 400         struct parport_uss720_private *priv = pp->private_data;
 401         unsigned char d;
 402
 403         d = priv->reg[1] & ~0x10;
 404         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 405                 return;
 406         priv->reg[1] = d;
 407 }
 408
 409 static void parport_uss720_enable_irq(struct parport *pp)
 410 {
 411         struct parport_uss720_private *priv = pp->private_data;
 412         unsigned char d;
 413
 414         d = priv->reg[1] | 0x10;
 415         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 416                 return;
 417         priv->reg[1] = d;
 418 }
 419
 420 static void parport_uss720_data_forward (struct parport *pp)
 421 {
 422         struct parport_uss720_private *priv = pp->private_data;
 423         unsigned char d;
 424
 425         d = priv->reg[1] & ~0x20;
 426         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 427                 return;
 428         priv->reg[1] = d;
 429 }
 430
 431 static void parport_uss720_data_reverse (struct parport *pp)
 432 {
 433         struct parport_uss720_private *priv = pp->private_data;
 434         unsigned char d;
 435
 436         d = priv->reg[1] | 0x20;
 437         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 438                 return;
 439         priv->reg[1] = d;
 440 }
 441
 442 static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
 443 {
 444         s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
 445         s->u.pc.ecr = 0x24;
 446 }
 447
 448 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
 449 {
 450         struct parport_uss720_private *priv = pp->private_data;
 451
 452 #if 0
 453         if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
 454                 return;
 455 #endif
 456         s->u.pc.ctr = priv->reg[1];
 457         s->u.pc.ecr = priv->reg[2];
 458 }
 459
 460 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
 461 {
 462         struct parport_uss720_private *priv = pp->private_data;
 463
 464         set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
 465         set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
 466         get_1284_register(pp, 2, NULL, GFP_ATOMIC);
 467         priv->reg[1] = s->u.pc.ctr;
 468         priv->reg[2] = s->u.pc.ecr;
 469 }
 470
 471 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
 472 {
 473         struct parport_uss720_private *priv = pp->private_data;
 474         size_t got = 0;
 475
 476         if (change_mode(pp, ECR_EPP))
 477                 return 0;
 478         for (; got < length; got++) {
 479                 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
 480                         break;
 481                 buf++;
 482                 if (priv->reg[0] & 0x01) {
 483                         clear_epp_timeout(pp);
 484                         break;
 485                 }
 486         }
 487         change_mode(pp, ECR_PS2);
 488         return got;
 489 }
 490
 491 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
 492 {
 493 #if 0
 494         struct parport_uss720_private *priv = pp->private_data;
 495         size_t written = 0;
 496
 497         if (change_mode(pp, ECR_EPP))
 498                 return 0;
 499         for (; written < length; written++) {
 500                 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
 501                         break;
 502                 ((char*)buf)++;
 503                 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
 504                         break;
 505                 if (priv->reg[0] & 0x01) {
 506                         clear_epp_timeout(pp);
 507                         break;
 508                 }
 509         }
 510         change_mode(pp, ECR_PS2);
 511         return written;
 512 #else
 513         struct parport_uss720_private *priv = pp->private_data;
 514         struct usb_device *usbdev = priv->usbdev;
 515         int rlen;
 516         int i;
 517
 518         if (!usbdev)
 519                 return 0;
 520         if (change_mode(pp, ECR_EPP))
 521                 return 0;
 522         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
 523         if (i)
 524                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buf, length, rlen);
 525         change_mode(pp, ECR_PS2);
 526         return rlen;
 527 #endif
 528 }
 529
 530 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
 531 {
 532         struct parport_uss720_private *priv = pp->private_data;
 533         size_t got = 0;
 534
 535         if (change_mode(pp, ECR_EPP))
 536                 return 0;
 537         for (; got < length; got++) {
 538                 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
 539                         break;
 540                 buf++;
 541                 if (priv->reg[0] & 0x01) {
 542                         clear_epp_timeout(pp);
 543                         break;
 544                 }
 545         }
 546         change_mode(pp, ECR_PS2);
 547         return got;
 548 }
 549
 550 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
 551 {
 552         struct parport_uss720_private *priv = pp->private_data;
 553         size_t written = 0;
 554
 555         if (change_mode(pp, ECR_EPP))
 556                 return 0;
 557         for (; written < length; written++) {
 558                 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
 559                         break;
 560                 buf++;
 561                 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
 562                         break;
 563                 if (priv->reg[0] & 0x01) {
 564                         clear_epp_timeout(pp);
 565                         break;
 566                 }
 567         }
 568         change_mode(pp, ECR_PS2);
 569         return written;
 570 }
 571
 572 static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
 573 {
 574         struct parport_uss720_private *priv = pp->private_data;
 575         struct usb_device *usbdev = priv->usbdev;
 576         int rlen;
 577         int i;
 578
 579         if (!usbdev)
 580                 return 0;
 581         if (change_mode(pp, ECR_ECP))
 582                 return 0;
 583         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
 584         if (i)
 585                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
 586         change_mode(pp, ECR_PS2);
 587         return rlen;
 588 }
 589
 590 static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
 591 {
 592         struct parport_uss720_private *priv = pp->private_data;
 593         struct usb_device *usbdev = priv->usbdev;
 594         int rlen;
 595         int i;
 596
 597         if (!usbdev)
 598                 return 0;
 599         if (change_mode(pp, ECR_ECP))
 600                 return 0;
 601         i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
 602         if (i)
 603                 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %Zu rlen %u\n", buffer, len, rlen);
 604         change_mode(pp, ECR_PS2);
 605         return rlen;
 606 }
 607
 608 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
 609 {
 610         size_t written = 0;
 611
 612         if (change_mode(pp, ECR_ECP))
 613                 return 0;
 614         for (; written < len; written++) {
 615                 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
 616                         break;
 617                 buffer++;
 618         }
 619         change_mode(pp, ECR_PS2);
 620         return written;
 621 }
 622
 623 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
 624 {
 625         struct parport_uss720_private *priv = pp->private_data;
 626         struct usb_device *usbdev = priv->usbdev;
 627         int rlen;
 628         int i;
 629
 630         if (!usbdev)
 631                 return 0;
 632         if (change_mode(pp, ECR_PPF))
 633                 return 0;
 634         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
 635         if (i)
 636                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
 637         change_mode(pp, ECR_PS2);
 638         return rlen;
 639 }
 640
 641 /* --------------------------------------------------------------------- */
 642
 643 static struct parport_operations parport_uss720_ops =
 644 {
 645         .owner =                THIS_MODULE,
 646         .write_data =           parport_uss720_write_data,
 647         .read_data =            parport_uss720_read_data,
 648
 649         .write_control =        parport_uss720_write_control,
 650         .read_control =         parport_uss720_read_control,
 651         .frob_control =         parport_uss720_frob_control,
 652
 653         .read_status =          parport_uss720_read_status,
 654
 655         .enable_irq =           parport_uss720_enable_irq,
 656         .disable_irq =          parport_uss720_disable_irq,
 657
 658         .data_forward =         parport_uss720_data_forward,
 659         .data_reverse =         parport_uss720_data_reverse,
 660
 661         .init_state =           parport_uss720_init_state,
 662         .save_state =           parport_uss720_save_state,
 663         .restore_state =        parport_uss720_restore_state,
 664
 665         .epp_write_data =       parport_uss720_epp_write_data,
 666         .epp_read_data =        parport_uss720_epp_read_data,
 667         .epp_write_addr =       parport_uss720_epp_write_addr,
 668         .epp_read_addr =        parport_uss720_epp_read_addr,
 669
 670         .ecp_write_data =       parport_uss720_ecp_write_data,
 671         .ecp_read_data =        parport_uss720_ecp_read_data,
 672         .ecp_write_addr =       parport_uss720_ecp_write_addr,
 673
 674         .compat_write_data =    parport_uss720_write_compat,
 675         .nibble_read_data =     parport_ieee1284_read_nibble,
 676         .byte_read_data =       parport_ieee1284_read_byte,
 677 };
 678
 679 /* --------------------------------------------------------------------- */
 680
 681 static int uss720_probe(struct usb_interface *intf,
 682                         const struct usb_device_id *id)
 683 {
 684         struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
 685         struct usb_host_interface *interface;
 686         struct usb_host_endpoint *endpoint;
 687         struct parport_uss720_private *priv;
 688         struct parport *pp;
 689         unsigned char reg;
 690         int i;
 691
 692         dbg("probe: vendor id 0x%x, device id 0x%x\n",
 693             le16_to_cpu(usbdev->descriptor.idVendor),
 694             le16_to_cpu(usbdev->descriptor.idProduct));
 695
 696         /* our known interfaces have 3 alternate settings */
 697         if (intf->num_altsetting != 3) {
 698                 usb_put_dev(usbdev);
 699                 return -ENODEV;
 700         }
 701         i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
 702         dbg("set inteface result %d", i);
 703
 704         interface = intf->cur_altsetting;
 705
 706         /*
 707          * Allocate parport interface
 708          */
 709         if (!(priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL))) {
 710                 usb_put_dev(usbdev);
 711                 return -ENOMEM;
 712         }
 713         priv->pp = NULL;
 714         priv->usbdev = usbdev;
 715         kref_init(&priv->ref_count);
 716         spin_lock_init(&priv->asynclock);
 717         INIT_LIST_HEAD(&priv->asynclist);
 718         if (!(pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops))) {
 719                 warn("could not register parport");
 720                 goto probe_abort;
 721         }
 722
 723         priv->pp = pp;
 724         pp->private_data = priv;
 725         pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
 726
 727         /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
 728         set_1284_register(pp, 7, 0x00, GFP_KERNEL);
 729         set_1284_register(pp, 6, 0x30, GFP_KERNEL);  /* PS/2 mode */
 730         set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
 731         /* debugging */
 732         get_1284_register(pp, 0, &reg, GFP_KERNEL);
 733         dbg("reg: %02x %02x %02x %02x %02x %02x %02x",
 734             priv->reg[0], priv->reg[1], priv->reg[2], priv->reg[3], priv->reg[4], priv->reg[5], priv->reg[6]);
 735
 736         endpoint = &interface->endpoint[2];
 737         dbg("epaddr %d interval %d", endpoint->desc.bEndpointAddress, endpoint->desc.bInterval);
 738         parport_announce_port(pp);
 739
 740         usb_set_intfdata(intf, pp);
 741         return 0;
 742
 743 probe_abort:
 744         kill_all_async_requests_priv(priv);
 745         kref_put(&priv->ref_count, destroy_priv);
 746         return -ENODEV;
 747 }
 748
 749 static void uss720_disconnect(struct usb_interface *intf)
 750 {
 751         struct parport *pp = usb_get_intfdata(intf);
 752         struct parport_uss720_private *priv;
 753         struct usb_device *usbdev;
 754
 755         dbg("disconnect");
 756         usb_set_intfdata(intf, NULL);
 757         if (pp) {
 758                 priv = pp->private_data;
 759                 usbdev = priv->usbdev;
 760                 priv->usbdev = NULL;
 761                 priv->pp = NULL;
 762                 dbg("parport_remove_port");
 763                 parport_remove_port(pp);
 764                 parport_put_port(pp);
 765                 kill_all_async_requests_priv(priv);
 766                 kref_put(&priv->ref_count, destroy_priv);
 767         }
 768         dbg("disconnect done");
 769 }
 770
 771 /* table of cables that work through this driver */
 772 static struct usb_device_id uss720_table [] = {
 773         { USB_DEVICE(0x047e, 0x1001) },
 774         { USB_DEVICE(0x0557, 0x2001) },
 775         { USB_DEVICE(0x0729, 0x1284) },
 776         { USB_DEVICE(0x1293, 0x0002) },
 777         { }                                             /* Terminating entry */
 778 };
 779
 780 MODULE_DEVICE_TABLE (usb, uss720_table);
 781
 782
 783 static struct usb_driver uss720_driver = {
 784         .name =         "uss720",
 785         .probe =        uss720_probe,
 786         .disconnect =   uss720_disconnect,
 787         .id_table =     uss720_table,
 788 };
 789
 790 /* --------------------------------------------------------------------- */
 791
 792 MODULE_AUTHOR(DRIVER_AUTHOR);
 793 MODULE_DESCRIPTION(DRIVER_DESC);
 794 MODULE_LICENSE("GPL");
 795
 796 static int __init uss720_init(void)
 797 {
 798         int retval;
 799         retval = usb_register(&uss720_driver);
 800         if (retval)
 801                 goto out;
 802
 803         info(DRIVER_VERSION ":" DRIVER_DESC);
 804         info("NOTE: this is a special purpose driver to allow nonstandard");
 805         info("protocols (eg. bitbang) over USS720 usb to parallel cables");
 806         info("If you just want to connect to a printer, use usblp instead");
 807 out:
 808         return retval;
 809 }
 810
 811 static void __exit uss720_cleanup(void)
 812 {
 813         usb_deregister(&uss720_driver);
 814 }
 815
 816 module_init(uss720_init);
 817 module_exit(uss720_cleanup);
 818
 819 /* --------------------------------------------------------------------- */