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         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                 dev_err(&urb->dev->dev, "async_complete: urb error %d\n",
 122                         status);
 123         } else if (rq->dr.bRequest == 3) {
 124                 memcpy(priv->reg, rq->reg, sizeof(priv->reg));
 125 #if 0
 126                 dev_dbg(&priv->usbdev->dev,
 127                         "async_complete regs %02x %02x %02x %02x %02x %02x %02x\n",
 128                         (unsigned int)priv->reg[0], (unsigned int)priv->reg[1],
 129                         (unsigned int)priv->reg[2], (unsigned int)priv->reg[3],
 130                         (unsigned int)priv->reg[4], (unsigned int)priv->reg[5],
 131                         (unsigned int)priv->reg[6]);
 132 #endif
 133                 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
 134                 if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
 135                         parport_generic_irq(pp);
 136         }
 137         complete(&rq->compl);
 138         kref_put(&rq->ref_count, destroy_async);
 139 }
 140
 141 static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
 142                                                          __u8 request, __u8 requesttype, __u16 value, __u16 index,
 143                                                          gfp_t mem_flags)
 144 {
 145         struct usb_device *usbdev;
 146         struct uss720_async_request *rq;
 147         unsigned long flags;
 148         int ret;
 149
 150         if (!priv)
 151                 return NULL;
 152         usbdev = priv->usbdev;
 153         if (!usbdev)
 154                 return NULL;
 155         rq = kmalloc(sizeof(struct uss720_async_request), mem_flags);
 156         if (!rq) {
 157                 dev_err(&usbdev->dev, "submit_async_request out of memory\n");
 158                 return NULL;
 159         }
 160         kref_init(&rq->ref_count);
 161         INIT_LIST_HEAD(&rq->asynclist);
 162         init_completion(&rq->compl);
 163         kref_get(&priv->ref_count);
 164         rq->priv = priv;
 165         rq->urb = usb_alloc_urb(0, mem_flags);
 166         if (!rq->urb) {
 167                 kref_put(&rq->ref_count, destroy_async);
 168                 dev_err(&usbdev->dev, "submit_async_request out of memory\n");
 169                 return NULL;
 170         }
 171         rq->dr.bRequestType = requesttype;
 172         rq->dr.bRequest = request;
 173         rq->dr.wValue = cpu_to_le16(value);
 174         rq->dr.wIndex = cpu_to_le16(index);
 175         rq->dr.wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
 176         usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
 177                              (unsigned char *)&rq->dr,
 178                              (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
 179         /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
 180         spin_lock_irqsave(&priv->asynclock, flags);
 181         list_add_tail(&rq->asynclist, &priv->asynclist);
 182         spin_unlock_irqrestore(&priv->asynclock, flags);
 183         kref_get(&rq->ref_count);
 184         ret = usb_submit_urb(rq->urb, mem_flags);
 185         if (!ret)
 186                 return rq;
 187         destroy_async(&rq->ref_count);
 188         dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
 189         return NULL;
 190 }
 191
 192 static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
 193 {
 194         struct uss720_async_request *rq;
 195         unsigned long flags;
 196         unsigned int ret = 0;
 197
 198         spin_lock_irqsave(&priv->asynclock, flags);
 199         list_for_each_entry(rq, &priv->asynclist, asynclist) {
 200                 usb_unlink_urb(rq->urb);
 201                 ret++;
 202         }
 203         spin_unlock_irqrestore(&priv->asynclock, flags);
 204         return ret;
 205 }
 206
 207 /* --------------------------------------------------------------------- */
 208
 209 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
 210 {
 211         struct parport_uss720_private *priv;
 212         struct uss720_async_request *rq;
 213         static const unsigned char regindex[9] = {
 214                 4, 0, 1, 5, 5, 0, 2, 3, 6
 215         };
 216         int ret;
 217
 218         if (!pp)
 219                 return -EIO;
 220         priv = pp->private_data;
 221         rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
 222         if (!rq) {
 223                 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
 224                         (unsigned int)reg);
 225                 return -EIO;
 226         }
 227         if (!val) {
 228                 kref_put(&rq->ref_count, destroy_async);
 229                 return 0;
 230         }
 231         if (wait_for_completion_timeout(&rq->compl, HZ)) {
 232                 ret = rq->urb->status;
 233                 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
 234                 if (ret)
 235                         printk(KERN_WARNING "get_1284_register: "
 236                                "usb error %d\n", ret);
 237                 kref_put(&rq->ref_count, destroy_async);
 238                 return ret;
 239         }
 240         printk(KERN_WARNING "get_1284_register timeout\n");
 241         kill_all_async_requests_priv(priv);
 242         return -EIO;
 243 }
 244
 245 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
 246 {
 247         struct parport_uss720_private *priv;
 248         struct uss720_async_request *rq;
 249
 250         if (!pp)
 251                 return -EIO;
 252         priv = pp->private_data;
 253         rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
 254         if (!rq) {
 255                 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
 256                         (unsigned int)reg, (unsigned int)val);
 257                 return -EIO;
 258         }
 259         kref_put(&rq->ref_count, destroy_async);
 260         return 0;
 261 }
 262
 263 /* --------------------------------------------------------------------- */
 264
 265 /* ECR modes */
 266 #define ECR_SPP 00
 267 #define ECR_PS2 01
 268 #define ECR_PPF 02
 269 #define ECR_ECP 03
 270 #define ECR_EPP 04
 271
 272 /* Safely change the mode bits in the ECR */
 273 static int change_mode(struct parport *pp, int m)
 274 {
 275         struct parport_uss720_private *priv = pp->private_data;
 276         int mode;
 277         __u8 reg;
 278
 279         if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 280                 return -EIO;
 281         /* Bits <7:5> contain the mode. */
 282         mode = (priv->reg[2] >> 5) & 0x7;
 283         if (mode == m)
 284                 return 0;
 285         /* We have to go through mode 000 or 001 */
 286         if (mode > ECR_PS2 && m > ECR_PS2)
 287                 if (change_mode(pp, ECR_PS2))
 288                         return -EIO;
 289
 290         if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
 291                 /* This mode resets the FIFO, so we may
 292                  * have to wait for it to drain first. */
 293                 unsigned long expire = jiffies + pp->physport->cad->timeout;
 294                 switch (mode) {
 295                 case ECR_PPF: /* Parallel Port FIFO mode */
 296                 case ECR_ECP: /* ECP Parallel Port mode */
 297                         /* Poll slowly. */
 298                         for (;;) {
 299                                 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 300                                         return -EIO;
 301                                 if (priv->reg[2] & 0x01)
 302                                         break;
 303                                 if (time_after_eq (jiffies, expire))
 304                                         /* The FIFO is stuck. */
 305                                         return -EBUSY;
 306                                 msleep_interruptible(10);
 307                                 if (signal_pending (current))
 308                                         break;
 309                         }
 310                 }
 311         }
 312         /* Set the mode. */
 313         if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
 314                 return -EIO;
 315         if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 316                 return -EIO;
 317         return 0;
 318 }
 319
 320 /*
 321  * Clear TIMEOUT BIT in EPP MODE
 322  */
 323 static int clear_epp_timeout(struct parport *pp)
 324 {
 325         unsigned char stat;
 326
 327         if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
 328                 return 1;
 329         return stat & 1;
 330 }
 331
 332 /*
 333  * Access functions.
 334  */
 335 #if 0
 336 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
 337 {
 338         struct parport *pp = (struct parport *)dev_id;
 339         struct parport_uss720_private *priv = pp->private_data;
 340
 341         if (usbstatus != 0 || len < 4 || !buffer)
 342                 return 1;
 343         memcpy(priv->reg, buffer, 4);
 344         /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
 345         if (priv->reg[2] & priv->reg[1] & 0x10)
 346                 parport_generic_irq(pp);
 347         return 1;
 348 }
 349 #endif
 350
 351 static void parport_uss720_write_data(struct parport *pp, unsigned char d)
 352 {
 353         set_1284_register(pp, 0, d, GFP_KERNEL);
 354 }
 355
 356 static unsigned char parport_uss720_read_data(struct parport *pp)
 357 {
 358         unsigned char ret;
 359
 360         if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
 361                 return 0;
 362         return ret;
 363 }
 364
 365 static void parport_uss720_write_control(struct parport *pp, unsigned char d)
 366 {
 367         struct parport_uss720_private *priv = pp->private_data;
 368
 369         d = (d & 0xf) | (priv->reg[1] & 0xf0);
 370         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 371                 return;
 372         priv->reg[1] = d;
 373 }
 374
 375 static unsigned char parport_uss720_read_control(struct parport *pp)
 376 {
 377         struct parport_uss720_private *priv = pp->private_data;
 378         return priv->reg[1] & 0xf; /* Use soft copy */
 379 }
 380
 381 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
 382 {
 383         struct parport_uss720_private *priv = pp->private_data;
 384         unsigned char d;
 385
 386         mask &= 0x0f;
 387         val &= 0x0f;
 388         d = (priv->reg[1] & (~mask)) ^ val;
 389         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 390                 return 0;
 391         priv->reg[1] = d;
 392         return d & 0xf;
 393 }
 394
 395 static unsigned char parport_uss720_read_status(struct parport *pp)
 396 {
 397         unsigned char ret;
 398
 399         if (get_1284_register(pp, 1, &ret, GFP_KERNEL))
 400                 return 0;
 401         return ret & 0xf8;
 402 }
 403
 404 static void parport_uss720_disable_irq(struct parport *pp)
 405 {
 406         struct parport_uss720_private *priv = pp->private_data;
 407         unsigned char d;
 408
 409         d = priv->reg[1] & ~0x10;
 410         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 411                 return;
 412         priv->reg[1] = d;
 413 }
 414
 415 static void parport_uss720_enable_irq(struct parport *pp)
 416 {
 417         struct parport_uss720_private *priv = pp->private_data;
 418         unsigned char d;
 419
 420         d = priv->reg[1] | 0x10;
 421         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 422                 return;
 423         priv->reg[1] = d;
 424 }
 425
 426 static void parport_uss720_data_forward (struct parport *pp)
 427 {
 428         struct parport_uss720_private *priv = pp->private_data;
 429         unsigned char d;
 430
 431         d = priv->reg[1] & ~0x20;
 432         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 433                 return;
 434         priv->reg[1] = d;
 435 }
 436
 437 static void parport_uss720_data_reverse (struct parport *pp)
 438 {
 439         struct parport_uss720_private *priv = pp->private_data;
 440         unsigned char d;
 441
 442         d = priv->reg[1] | 0x20;
 443         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 444                 return;
 445         priv->reg[1] = d;
 446 }
 447
 448 static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
 449 {
 450         s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
 451         s->u.pc.ecr = 0x24;
 452 }
 453
 454 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
 455 {
 456         struct parport_uss720_private *priv = pp->private_data;
 457
 458 #if 0
 459         if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
 460                 return;
 461 #endif
 462         s->u.pc.ctr = priv->reg[1];
 463         s->u.pc.ecr = priv->reg[2];
 464 }
 465
 466 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
 467 {
 468         struct parport_uss720_private *priv = pp->private_data;
 469
 470         set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
 471         set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
 472         get_1284_register(pp, 2, NULL, GFP_ATOMIC);
 473         priv->reg[1] = s->u.pc.ctr;
 474         priv->reg[2] = s->u.pc.ecr;
 475 }
 476
 477 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
 478 {
 479         struct parport_uss720_private *priv = pp->private_data;
 480         size_t got = 0;
 481
 482         if (change_mode(pp, ECR_EPP))
 483                 return 0;
 484         for (; got < length; got++) {
 485                 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
 486                         break;
 487                 buf++;
 488                 if (priv->reg[0] & 0x01) {
 489                         clear_epp_timeout(pp);
 490                         break;
 491                 }
 492         }
 493         change_mode(pp, ECR_PS2);
 494         return got;
 495 }
 496
 497 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
 498 {
 499 #if 0
 500         struct parport_uss720_private *priv = pp->private_data;
 501         size_t written = 0;
 502
 503         if (change_mode(pp, ECR_EPP))
 504                 return 0;
 505         for (; written < length; written++) {
 506                 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
 507                         break;
 508                 ((char*)buf)++;
 509                 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
 510                         break;
 511                 if (priv->reg[0] & 0x01) {
 512                         clear_epp_timeout(pp);
 513                         break;
 514                 }
 515         }
 516         change_mode(pp, ECR_PS2);
 517         return written;
 518 #else
 519         struct parport_uss720_private *priv = pp->private_data;
 520         struct usb_device *usbdev = priv->usbdev;
 521         int rlen;
 522         int i;
 523
 524         if (!usbdev)
 525                 return 0;
 526         if (change_mode(pp, ECR_EPP))
 527                 return 0;
 528         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
 529         if (i)
 530                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buf, length, rlen);
 531         change_mode(pp, ECR_PS2);
 532         return rlen;
 533 #endif
 534 }
 535
 536 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
 537 {
 538         struct parport_uss720_private *priv = pp->private_data;
 539         size_t got = 0;
 540
 541         if (change_mode(pp, ECR_EPP))
 542                 return 0;
 543         for (; got < length; got++) {
 544                 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
 545                         break;
 546                 buf++;
 547                 if (priv->reg[0] & 0x01) {
 548                         clear_epp_timeout(pp);
 549                         break;
 550                 }
 551         }
 552         change_mode(pp, ECR_PS2);
 553         return got;
 554 }
 555
 556 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
 557 {
 558         struct parport_uss720_private *priv = pp->private_data;
 559         size_t written = 0;
 560
 561         if (change_mode(pp, ECR_EPP))
 562                 return 0;
 563         for (; written < length; written++) {
 564                 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
 565                         break;
 566                 buf++;
 567                 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
 568                         break;
 569                 if (priv->reg[0] & 0x01) {
 570                         clear_epp_timeout(pp);
 571                         break;
 572                 }
 573         }
 574         change_mode(pp, ECR_PS2);
 575         return written;
 576 }
 577
 578 static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
 579 {
 580         struct parport_uss720_private *priv = pp->private_data;
 581         struct usb_device *usbdev = priv->usbdev;
 582         int rlen;
 583         int i;
 584
 585         if (!usbdev)
 586                 return 0;
 587         if (change_mode(pp, ECR_ECP))
 588                 return 0;
 589         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
 590         if (i)
 591                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
 592         change_mode(pp, ECR_PS2);
 593         return rlen;
 594 }
 595
 596 static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
 597 {
 598         struct parport_uss720_private *priv = pp->private_data;
 599         struct usb_device *usbdev = priv->usbdev;
 600         int rlen;
 601         int i;
 602
 603         if (!usbdev)
 604                 return 0;
 605         if (change_mode(pp, ECR_ECP))
 606                 return 0;
 607         i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
 608         if (i)
 609                 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %Zu rlen %u\n", buffer, len, rlen);
 610         change_mode(pp, ECR_PS2);
 611         return rlen;
 612 }
 613
 614 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
 615 {
 616         size_t written = 0;
 617
 618         if (change_mode(pp, ECR_ECP))
 619                 return 0;
 620         for (; written < len; written++) {
 621                 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
 622                         break;
 623                 buffer++;
 624         }
 625         change_mode(pp, ECR_PS2);
 626         return written;
 627 }
 628
 629 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
 630 {
 631         struct parport_uss720_private *priv = pp->private_data;
 632         struct usb_device *usbdev = priv->usbdev;
 633         int rlen;
 634         int i;
 635
 636         if (!usbdev)
 637                 return 0;
 638         if (change_mode(pp, ECR_PPF))
 639                 return 0;
 640         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
 641         if (i)
 642                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
 643         change_mode(pp, ECR_PS2);
 644         return rlen;
 645 }
 646
 647 /* --------------------------------------------------------------------- */
 648
 649 static struct parport_operations parport_uss720_ops =
 650 {
 651         .owner =                THIS_MODULE,
 652         .write_data =           parport_uss720_write_data,
 653         .read_data =            parport_uss720_read_data,
 654
 655         .write_control =        parport_uss720_write_control,
 656         .read_control =         parport_uss720_read_control,
 657         .frob_control =         parport_uss720_frob_control,
 658
 659         .read_status =          parport_uss720_read_status,
 660
 661         .enable_irq =           parport_uss720_enable_irq,
 662         .disable_irq =          parport_uss720_disable_irq,
 663
 664         .data_forward =         parport_uss720_data_forward,
 665         .data_reverse =         parport_uss720_data_reverse,
 666
 667         .init_state =           parport_uss720_init_state,
 668         .save_state =           parport_uss720_save_state,
 669         .restore_state =        parport_uss720_restore_state,
 670
 671         .epp_write_data =       parport_uss720_epp_write_data,
 672         .epp_read_data =        parport_uss720_epp_read_data,
 673         .epp_write_addr =       parport_uss720_epp_write_addr,
 674         .epp_read_addr =        parport_uss720_epp_read_addr,
 675
 676         .ecp_write_data =       parport_uss720_ecp_write_data,
 677         .ecp_read_data =        parport_uss720_ecp_read_data,
 678         .ecp_write_addr =       parport_uss720_ecp_write_addr,
 679
 680         .compat_write_data =    parport_uss720_write_compat,
 681         .nibble_read_data =     parport_ieee1284_read_nibble,
 682         .byte_read_data =       parport_ieee1284_read_byte,
 683 };
 684
 685 /* --------------------------------------------------------------------- */
 686
 687 static int uss720_probe(struct usb_interface *intf,
 688                         const struct usb_device_id *id)
 689 {
 690         struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
 691         struct usb_host_interface *interface;
 692         struct usb_host_endpoint *endpoint;
 693         struct parport_uss720_private *priv;
 694         struct parport *pp;
 695         unsigned char reg;
 696         int i;
 697
 698         dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n",
 699                 le16_to_cpu(usbdev->descriptor.idVendor),
 700                 le16_to_cpu(usbdev->descriptor.idProduct));
 701
 702         /* our known interfaces have 3 alternate settings */
 703         if (intf->num_altsetting != 3) {
 704                 usb_put_dev(usbdev);
 705                 return -ENODEV;
 706         }
 707         i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
 708         dev_dbg(&intf->dev, "set interface result %d\n", i);
 709
 710         interface = intf->cur_altsetting;
 711
 712         /*
 713          * Allocate parport interface
 714          */
 715         if (!(priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL))) {
 716                 usb_put_dev(usbdev);
 717                 return -ENOMEM;
 718         }
 719         priv->pp = NULL;
 720         priv->usbdev = usbdev;
 721         kref_init(&priv->ref_count);
 722         spin_lock_init(&priv->asynclock);
 723         INIT_LIST_HEAD(&priv->asynclist);
 724         if (!(pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops))) {
 725                 printk(KERN_WARNING "uss720: could not register parport\n");
 726                 goto probe_abort;
 727         }
 728
 729         priv->pp = pp;
 730         pp->private_data = priv;
 731         pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
 732
 733         /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
 734         set_1284_register(pp, 7, 0x00, GFP_KERNEL);
 735         set_1284_register(pp, 6, 0x30, GFP_KERNEL);  /* PS/2 mode */
 736         set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
 737         /* debugging */
 738         get_1284_register(pp, 0, &reg, GFP_KERNEL);
 739         dev_dbg(&intf->dev, "reg: %02x %02x %02x %02x %02x %02x %02x\n",
 740                 priv->reg[0], priv->reg[1], priv->reg[2], priv->reg[3],
 741                 priv->reg[4], priv->reg[5], priv->reg[6]);
 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 /* --------------------------------------------------------------------- */