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 #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         usb_put_dev(priv->usbdev);
  89         kfree(priv);
  90         dbg("destroying priv datastructure");
  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         spin_lock_irqsave(&priv->asynclock, flags);
 102         list_del_init(&rq->asynclist);
 103         spin_unlock_irqrestore(&priv->asynclock, flags);
 104         kfree(rq);
 105         kref_put(&priv->ref_count, destroy_priv);
 106 }
 107
 108 /* --------------------------------------------------------------------- */
 109
 110 static void async_complete(struct urb *urb)
 111 {
 112         struct uss720_async_request *rq;
 113         struct parport *pp;
 114         struct parport_uss720_private *priv;
 115         int status = urb->status;
 116
 117         rq = urb->context;
 118         priv = rq->priv;
 119         pp = priv->pp;
 120         if (status) {
 121                 err("async_complete: urb error %d", status);
 122         } else if (rq->dr.bRequest == 3) {
 123                 memcpy(priv->reg, rq->reg, sizeof(priv->reg));
 124 #if 0
 125                 dbg("async_complete regs %02x %02x %02x %02x %02x %02x %02x",
 126                     (unsigned int)priv->reg[0], (unsigned int)priv->reg[1], (unsigned int)priv->reg[2],
 127                     (unsigned int)priv->reg[3], (unsigned int)priv->reg[4], (unsigned int)priv->reg[5],
 128                     (unsigned int)priv->reg[6]);
 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 = kmalloc(sizeof(struct uss720_async_request), mem_flags);
 153         if (!rq) {
 154                 err("submit_async_request out of memory");
 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                 err("submit_async_request out of memory");
 166                 return NULL;
 167         }
 168         rq->dr.bRequestType = requesttype;
 169         rq->dr.bRequest = request;
 170         rq->dr.wValue = cpu_to_le16(value);
 171         rq->dr.wIndex = cpu_to_le16(index);
 172         rq->dr.wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
 173         usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
 174                              (unsigned char *)&rq->dr,
 175                              (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
 176         /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
 177         spin_lock_irqsave(&priv->asynclock, flags);
 178         list_add_tail(&rq->asynclist, &priv->asynclist);
 179         spin_unlock_irqrestore(&priv->asynclock, flags);
 180         ret = usb_submit_urb(rq->urb, mem_flags);
 181         if (!ret) {
 182                 kref_get(&rq->ref_count);
 183                 return rq;
 184         }
 185         kref_put(&rq->ref_count, destroy_async);
 186         err("submit_async_request submit_urb failed with %d", ret);
 187         return NULL;
 188 }
 189
 190 static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
 191 {
 192         struct uss720_async_request *rq;
 193         unsigned long flags;
 194         unsigned int ret = 0;
 195
 196         spin_lock_irqsave(&priv->asynclock, flags);
 197         list_for_each_entry(rq, &priv->asynclist, asynclist) {
 198                 usb_unlink_urb(rq->urb);
 199                 ret++;
 200         }
 201         spin_unlock_irqrestore(&priv->asynclock, flags);
 202         return ret;
 203 }
 204
 205 /* --------------------------------------------------------------------- */
 206
 207 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
 208 {
 209         struct parport_uss720_private *priv;
 210         struct uss720_async_request *rq;
 211         static const unsigned char regindex[9] = {
 212                 4, 0, 1, 5, 5, 0, 2, 3, 6
 213         };
 214         int ret;
 215
 216         if (!pp)
 217                 return -EIO;
 218         priv = pp->private_data;
 219         rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
 220         if (!rq) {
 221                 err("get_1284_register(%u) failed", (unsigned int)reg);
 222                 return -EIO;
 223         }
 224         if (!val) {
 225                 kref_put(&rq->ref_count, destroy_async);
 226                 return 0;
 227         }
 228         if (wait_for_completion_timeout(&rq->compl, HZ)) {
 229                 ret = rq->urb->status;
 230                 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
 231                 if (ret)
 232                         printk(KERN_WARNING "get_1284_register: "
 233                                "usb error %d\n", ret);
 234                 kref_put(&rq->ref_count, destroy_async);
 235                 return ret;
 236         }
 237         printk(KERN_WARNING "get_1284_register timeout\n");
 238         kill_all_async_requests_priv(priv);
 239         return -EIO;
 240 }
 241
 242 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
 243 {
 244         struct parport_uss720_private *priv;
 245         struct uss720_async_request *rq;
 246
 247         if (!pp)
 248                 return -EIO;
 249         priv = pp->private_data;
 250         rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
 251         if (!rq) {
 252                 err("set_1284_register(%u,%u) failed", (unsigned int)reg, (unsigned int)val);
 253                 return -EIO;
 254         }
 255         kref_put(&rq->ref_count, destroy_async);
 256         return 0;
 257 }
 258
 259 /* --------------------------------------------------------------------- */
 260
 261 /* ECR modes */
 262 #define ECR_SPP 00
 263 #define ECR_PS2 01
 264 #define ECR_PPF 02
 265 #define ECR_ECP 03
 266 #define ECR_EPP 04
 267
 268 /* Safely change the mode bits in the ECR */
 269 static int change_mode(struct parport *pp, int m)
 270 {
 271         struct parport_uss720_private *priv = pp->private_data;
 272         int mode;
 273         __u8 reg;
 274
 275         if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 276                 return -EIO;
 277         /* Bits <7:5> contain the mode. */
 278         mode = (priv->reg[2] >> 5) & 0x7;
 279         if (mode == m)
 280                 return 0;
 281         /* We have to go through mode 000 or 001 */
 282         if (mode > ECR_PS2 && m > ECR_PS2)
 283                 if (change_mode(pp, ECR_PS2))
 284                         return -EIO;
 285
 286         if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
 287                 /* This mode resets the FIFO, so we may
 288                  * have to wait for it to drain first. */
 289                 unsigned long expire = jiffies + pp->physport->cad->timeout;
 290                 switch (mode) {
 291                 case ECR_PPF: /* Parallel Port FIFO mode */
 292                 case ECR_ECP: /* ECP Parallel Port mode */
 293                         /* Poll slowly. */
 294                         for (;;) {
 295                                 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 296                                         return -EIO;
 297                                 if (priv->reg[2] & 0x01)
 298                                         break;
 299                                 if (time_after_eq (jiffies, expire))
 300                                         /* The FIFO is stuck. */
 301                                         return -EBUSY;
 302                                 msleep_interruptible(10);
 303                                 if (signal_pending (current))
 304                                         break;
 305                         }
 306                 }
 307         }
 308         /* Set the mode. */
 309         if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
 310                 return -EIO;
 311         if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 312                 return -EIO;
 313         return 0;
 314 }
 315
 316 /*
 317  * Clear TIMEOUT BIT in EPP MODE
 318  */
 319 static int clear_epp_timeout(struct parport *pp)
 320 {
 321         unsigned char stat;
 322
 323         if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
 324                 return 1;
 325         return stat & 1;
 326 }
 327
 328 /*
 329  * Access functions.
 330  */
 331 #if 0
 332 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
 333 {
 334         struct parport *pp = (struct parport *)dev_id;
 335         struct parport_uss720_private *priv = pp->private_data;
 336
 337         if (usbstatus != 0 || len < 4 || !buffer)
 338                 return 1;
 339         memcpy(priv->reg, buffer, 4);
 340         /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
 341         if (priv->reg[2] & priv->reg[1] & 0x10)
 342                 parport_generic_irq(pp);
 343         return 1;
 344 }
 345 #endif
 346
 347 static void parport_uss720_write_data(struct parport *pp, unsigned char d)
 348 {
 349         set_1284_register(pp, 0, d, GFP_KERNEL);
 350 }
 351
 352 static unsigned char parport_uss720_read_data(struct parport *pp)
 353 {
 354         unsigned char ret;
 355
 356         if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
 357                 return 0;
 358         return ret;
 359 }
 360
 361 static void parport_uss720_write_control(struct parport *pp, unsigned char d)
 362 {
 363         struct parport_uss720_private *priv = pp->private_data;
 364
 365         d = (d & 0xf) | (priv->reg[1] & 0xf0);
 366         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 367                 return;
 368         priv->reg[1] = d;
 369 }
 370
 371 static unsigned char parport_uss720_read_control(struct parport *pp)
 372 {
 373         struct parport_uss720_private *priv = pp->private_data;
 374         return priv->reg[1] & 0xf; /* Use soft copy */
 375 }
 376
 377 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
 378 {
 379         struct parport_uss720_private *priv = pp->private_data;
 380         unsigned char d;
 381
 382         mask &= 0x0f;
 383         val &= 0x0f;
 384         d = (priv->reg[1] & (~mask)) ^ val;
 385         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 386                 return 0;
 387         priv->reg[1] = d;
 388         return d & 0xf;
 389 }
 390
 391 static unsigned char parport_uss720_read_status(struct parport *pp)
 392 {
 393         unsigned char ret;
 394
 395         if (get_1284_register(pp, 1, &ret, GFP_KERNEL))
 396                 return 0;
 397         return ret & 0xf8;
 398 }
 399
 400 static void parport_uss720_disable_irq(struct parport *pp)
 401 {
 402         struct parport_uss720_private *priv = pp->private_data;
 403         unsigned char d;
 404
 405         d = priv->reg[1] & ~0x10;
 406         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 407                 return;
 408         priv->reg[1] = d;
 409 }
 410
 411 static void parport_uss720_enable_irq(struct parport *pp)
 412 {
 413         struct parport_uss720_private *priv = pp->private_data;
 414         unsigned char d;
 415
 416         d = priv->reg[1] | 0x10;
 417         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 418                 return;
 419         priv->reg[1] = d;
 420 }
 421
 422 static void parport_uss720_data_forward (struct parport *pp)
 423 {
 424         struct parport_uss720_private *priv = pp->private_data;
 425         unsigned char d;
 426
 427         d = priv->reg[1] & ~0x20;
 428         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 429                 return;
 430         priv->reg[1] = d;
 431 }
 432
 433 static void parport_uss720_data_reverse (struct parport *pp)
 434 {
 435         struct parport_uss720_private *priv = pp->private_data;
 436         unsigned char d;
 437
 438         d = priv->reg[1] | 0x20;
 439         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 440                 return;
 441         priv->reg[1] = d;
 442 }
 443
 444 static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
 445 {
 446         s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
 447         s->u.pc.ecr = 0x24;
 448 }
 449
 450 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
 451 {
 452         struct parport_uss720_private *priv = pp->private_data;
 453
 454 #if 0
 455         if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
 456                 return;
 457 #endif
 458         s->u.pc.ctr = priv->reg[1];
 459         s->u.pc.ecr = priv->reg[2];
 460 }
 461
 462 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
 463 {
 464         struct parport_uss720_private *priv = pp->private_data;
 465
 466         set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
 467         set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
 468         get_1284_register(pp, 2, NULL, GFP_ATOMIC);
 469         priv->reg[1] = s->u.pc.ctr;
 470         priv->reg[2] = s->u.pc.ecr;
 471 }
 472
 473 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
 474 {
 475         struct parport_uss720_private *priv = pp->private_data;
 476         size_t got = 0;
 477
 478         if (change_mode(pp, ECR_EPP))
 479                 return 0;
 480         for (; got < length; got++) {
 481                 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
 482                         break;
 483                 buf++;
 484                 if (priv->reg[0] & 0x01) {
 485                         clear_epp_timeout(pp);
 486                         break;
 487                 }
 488         }
 489         change_mode(pp, ECR_PS2);
 490         return got;
 491 }
 492
 493 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
 494 {
 495 #if 0
 496         struct parport_uss720_private *priv = pp->private_data;
 497         size_t written = 0;
 498
 499         if (change_mode(pp, ECR_EPP))
 500                 return 0;
 501         for (; written < length; written++) {
 502                 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
 503                         break;
 504                 ((char*)buf)++;
 505                 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
 506                         break;
 507                 if (priv->reg[0] & 0x01) {
 508                         clear_epp_timeout(pp);
 509                         break;
 510                 }
 511         }
 512         change_mode(pp, ECR_PS2);
 513         return written;
 514 #else
 515         struct parport_uss720_private *priv = pp->private_data;
 516         struct usb_device *usbdev = priv->usbdev;
 517         int rlen;
 518         int i;
 519
 520         if (!usbdev)
 521                 return 0;
 522         if (change_mode(pp, ECR_EPP))
 523                 return 0;
 524         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
 525         if (i)
 526                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buf, length, rlen);
 527         change_mode(pp, ECR_PS2);
 528         return rlen;
 529 #endif
 530 }
 531
 532 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
 533 {
 534         struct parport_uss720_private *priv = pp->private_data;
 535         size_t got = 0;
 536
 537         if (change_mode(pp, ECR_EPP))
 538                 return 0;
 539         for (; got < length; got++) {
 540                 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
 541                         break;
 542                 buf++;
 543                 if (priv->reg[0] & 0x01) {
 544                         clear_epp_timeout(pp);
 545                         break;
 546                 }
 547         }
 548         change_mode(pp, ECR_PS2);
 549         return got;
 550 }
 551
 552 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
 553 {
 554         struct parport_uss720_private *priv = pp->private_data;
 555         size_t written = 0;
 556
 557         if (change_mode(pp, ECR_EPP))
 558                 return 0;
 559         for (; written < length; written++) {
 560                 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
 561                         break;
 562                 buf++;
 563                 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
 564                         break;
 565                 if (priv->reg[0] & 0x01) {
 566                         clear_epp_timeout(pp);
 567                         break;
 568                 }
 569         }
 570         change_mode(pp, ECR_PS2);
 571         return written;
 572 }
 573
 574 static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
 575 {
 576         struct parport_uss720_private *priv = pp->private_data;
 577         struct usb_device *usbdev = priv->usbdev;
 578         int rlen;
 579         int i;
 580
 581         if (!usbdev)
 582                 return 0;
 583         if (change_mode(pp, ECR_ECP))
 584                 return 0;
 585         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
 586         if (i)
 587                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
 588         change_mode(pp, ECR_PS2);
 589         return rlen;
 590 }
 591
 592 static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
 593 {
 594         struct parport_uss720_private *priv = pp->private_data;
 595         struct usb_device *usbdev = priv->usbdev;
 596         int rlen;
 597         int i;
 598
 599         if (!usbdev)
 600                 return 0;
 601         if (change_mode(pp, ECR_ECP))
 602                 return 0;
 603         i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
 604         if (i)
 605                 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %Zu rlen %u\n", buffer, len, rlen);
 606         change_mode(pp, ECR_PS2);
 607         return rlen;
 608 }
 609
 610 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
 611 {
 612         size_t written = 0;
 613
 614         if (change_mode(pp, ECR_ECP))
 615                 return 0;
 616         for (; written < len; written++) {
 617                 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
 618                         break;
 619                 buffer++;
 620         }
 621         change_mode(pp, ECR_PS2);
 622         return written;
 623 }
 624
 625 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
 626 {
 627         struct parport_uss720_private *priv = pp->private_data;
 628         struct usb_device *usbdev = priv->usbdev;
 629         int rlen;
 630         int i;
 631
 632         if (!usbdev)
 633                 return 0;
 634         if (change_mode(pp, ECR_PPF))
 635                 return 0;
 636         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
 637         if (i)
 638                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
 639         change_mode(pp, ECR_PS2);
 640         return rlen;
 641 }
 642
 643 /* --------------------------------------------------------------------- */
 644
 645 static struct parport_operations parport_uss720_ops =
 646 {
 647         .owner =                THIS_MODULE,
 648         .write_data =           parport_uss720_write_data,
 649         .read_data =            parport_uss720_read_data,
 650
 651         .write_control =        parport_uss720_write_control,
 652         .read_control =         parport_uss720_read_control,
 653         .frob_control =         parport_uss720_frob_control,
 654
 655         .read_status =          parport_uss720_read_status,
 656
 657         .enable_irq =           parport_uss720_enable_irq,
 658         .disable_irq =          parport_uss720_disable_irq,
 659
 660         .data_forward =         parport_uss720_data_forward,
 661         .data_reverse =         parport_uss720_data_reverse,
 662
 663         .init_state =           parport_uss720_init_state,
 664         .save_state =           parport_uss720_save_state,
 665         .restore_state =        parport_uss720_restore_state,
 666
 667         .epp_write_data =       parport_uss720_epp_write_data,
 668         .epp_read_data =        parport_uss720_epp_read_data,
 669         .epp_write_addr =       parport_uss720_epp_write_addr,
 670         .epp_read_addr =        parport_uss720_epp_read_addr,
 671
 672         .ecp_write_data =       parport_uss720_ecp_write_data,
 673         .ecp_read_data =        parport_uss720_ecp_read_data,
 674         .ecp_write_addr =       parport_uss720_ecp_write_addr,
 675
 676         .compat_write_data =    parport_uss720_write_compat,
 677         .nibble_read_data =     parport_ieee1284_read_nibble,
 678         .byte_read_data =       parport_ieee1284_read_byte,
 679 };
 680
 681 /* --------------------------------------------------------------------- */
 682
 683 static int uss720_probe(struct usb_interface *intf,
 684                         const struct usb_device_id *id)
 685 {
 686         struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
 687         struct usb_host_interface *interface;
 688         struct usb_host_endpoint *endpoint;
 689         struct parport_uss720_private *priv;
 690         struct parport *pp;
 691         unsigned char reg;
 692         int i;
 693
 694         dbg("probe: vendor id 0x%x, device id 0x%x\n",
 695             le16_to_cpu(usbdev->descriptor.idVendor),
 696             le16_to_cpu(usbdev->descriptor.idProduct));
 697
 698         /* our known interfaces have 3 alternate settings */
 699         if (intf->num_altsetting != 3) {
 700                 usb_put_dev(usbdev);
 701                 return -ENODEV;
 702         }
 703         i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
 704         dbg("set inteface result %d", i);
 705
 706         interface = intf->cur_altsetting;
 707
 708         /*
 709          * Allocate parport interface
 710          */
 711         if (!(priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL))) {
 712                 usb_put_dev(usbdev);
 713                 return -ENOMEM;
 714         }
 715         priv->pp = NULL;
 716         priv->usbdev = usbdev;
 717         kref_init(&priv->ref_count);
 718         spin_lock_init(&priv->asynclock);
 719         INIT_LIST_HEAD(&priv->asynclist);
 720         if (!(pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops))) {
 721                 printk(KERN_WARNING "uss720: could not register parport\n");
 722                 goto probe_abort;
 723         }
 724
 725         priv->pp = pp;
 726         pp->private_data = priv;
 727         pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
 728
 729         /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
 730         set_1284_register(pp, 7, 0x00, GFP_KERNEL);
 731         set_1284_register(pp, 6, 0x30, GFP_KERNEL);  /* PS/2 mode */
 732         set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
 733         /* debugging */
 734         get_1284_register(pp, 0, &reg, GFP_KERNEL);
 735         dbg("reg: %02x %02x %02x %02x %02x %02x %02x",
 736             priv->reg[0], priv->reg[1], priv->reg[2], priv->reg[3], priv->reg[4], priv->reg[5], priv->reg[6]);
 737
 738         endpoint = &interface->endpoint[2];
 739         dbg("epaddr %d interval %d", endpoint->desc.bEndpointAddress, endpoint->desc.bInterval);
 740         parport_announce_port(pp);
 741
 742         usb_set_intfdata(intf, pp);
 743         return 0;
 744
 745 probe_abort:
 746         kill_all_async_requests_priv(priv);
 747         kref_put(&priv->ref_count, destroy_priv);
 748         return -ENODEV;
 749 }
 750
 751 static void uss720_disconnect(struct usb_interface *intf)
 752 {
 753         struct parport *pp = usb_get_intfdata(intf);
 754         struct parport_uss720_private *priv;
 755         struct usb_device *usbdev;
 756
 757         dbg("disconnect");
 758         usb_set_intfdata(intf, NULL);
 759         if (pp) {
 760                 priv = pp->private_data;
 761                 usbdev = priv->usbdev;
 762                 priv->usbdev = NULL;
 763                 priv->pp = NULL;
 764                 dbg("parport_remove_port");
 765                 parport_remove_port(pp);
 766                 parport_put_port(pp);
 767                 kill_all_async_requests_priv(priv);
 768                 kref_put(&priv->ref_count, destroy_priv);
 769         }
 770         dbg("disconnect done");
 771 }
 772
 773 /* table of cables that work through this driver */
 774 static const struct usb_device_id uss720_table[] = {
 775         { USB_DEVICE(0x047e, 0x1001) },
 776         { USB_DEVICE(0x0557, 0x2001) },
 777         { USB_DEVICE(0x0729, 0x1284) },
 778         { USB_DEVICE(0x1293, 0x0002) },
 779         { }                                             /* Terminating entry */
 780 };
 781
 782 MODULE_DEVICE_TABLE (usb, uss720_table);
 783
 784
 785 static struct usb_driver uss720_driver = {
 786         .name =         "uss720",
 787         .probe =        uss720_probe,
 788         .disconnect =   uss720_disconnect,
 789         .id_table =     uss720_table,
 790 };
 791
 792 /* --------------------------------------------------------------------- */
 793
 794 MODULE_AUTHOR(DRIVER_AUTHOR);
 795 MODULE_DESCRIPTION(DRIVER_DESC);
 796 MODULE_LICENSE("GPL");
 797
 798 static int __init uss720_init(void)
 799 {
 800         int retval;
 801         retval = usb_register(&uss720_driver);
 802         if (retval)
 803                 goto out;
 804
 805         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 806                DRIVER_DESC "\n");
 807         printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose "
 808                "driver to allow nonstandard\n");
 809         printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over "
 810                "USS720 usb to parallel cables\n");
 811         printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a "
 812                "printer, use usblp instead\n");
 813 out:
 814         return retval;
 815 }
 816
 817 static void __exit uss720_cleanup(void)
 818 {
 819         usb_deregister(&uss720_driver);
 820 }
 821
 822 module_init(uss720_init);
 823 module_exit(uss720_cleanup);
 824
 825 /* --------------------------------------------------------------------- */