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 #include <linux/sched/signal.h>
  54
  55 #define DRIVER_AUTHOR "Thomas M. Sailer, t.sailer@alumni.ethz.ch"
  56 #define DRIVER_DESC "USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip"
  57
  58 /* --------------------------------------------------------------------- */
  59
  60 struct parport_uss720_private {
  61         struct usb_device *usbdev;
  62         struct parport *pp;
  63         struct kref ref_count;
  64         __u8 reg[7];  /* USB registers */
  65         struct list_head asynclist;
  66         spinlock_t asynclock;
  67 };
  68
  69 struct uss720_async_request {
  70         struct parport_uss720_private *priv;
  71         struct kref ref_count;
  72         struct list_head asynclist;
  73         struct completion compl;
  74         struct urb *urb;
  75         struct usb_ctrlrequest *dr;
  76         __u8 reg[7];
  77 };
  78
  79 /* --------------------------------------------------------------------- */
  80
  81 static void destroy_priv(struct kref *kref)
  82 {
  83         struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count);
  84
  85         dev_dbg(&priv->usbdev->dev, "destroying priv datastructure\n");
  86         usb_put_dev(priv->usbdev);
  87         kfree(priv);
  88 }
  89
  90 static void destroy_async(struct kref *kref)
  91 {
  92         struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count);
  93         struct parport_uss720_private *priv = rq->priv;
  94         unsigned long flags;
  95
  96         if (likely(rq->urb))
  97                 usb_free_urb(rq->urb);
  98         kfree(rq->dr);
  99         spin_lock_irqsave(&priv->asynclock, flags);
 100         list_del_init(&rq->asynclist);
 101         spin_unlock_irqrestore(&priv->asynclock, flags);
 102         kfree(rq);
 103         kref_put(&priv->ref_count, destroy_priv);
 104 }
 105
 106 /* --------------------------------------------------------------------- */
 107
 108 static void async_complete(struct urb *urb)
 109 {
 110         struct uss720_async_request *rq;
 111         struct parport *pp;
 112         struct parport_uss720_private *priv;
 113         int status = urb->status;
 114
 115         rq = urb->context;
 116         priv = rq->priv;
 117         pp = priv->pp;
 118         if (status) {
 119                 dev_err(&urb->dev->dev, "async_complete: urb error %d\n",
 120                         status);
 121         } else if (rq->dr->bRequest == 3) {
 122                 memcpy(priv->reg, rq->reg, sizeof(priv->reg));
 123 #if 0
 124                 dev_dbg(&priv->usbdev->dev, "async_complete regs %7ph\n",
 125                         priv->reg);
 126 #endif
 127                 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
 128                 if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
 129                         parport_generic_irq(pp);
 130         }
 131         complete(&rq->compl);
 132         kref_put(&rq->ref_count, destroy_async);
 133 }
 134
 135 static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
 136                                                          __u8 request, __u8 requesttype, __u16 value, __u16 index,
 137                                                          gfp_t mem_flags)
 138 {
 139         struct usb_device *usbdev;
 140         struct uss720_async_request *rq;
 141         unsigned long flags;
 142         int ret;
 143
 144         if (!priv)
 145                 return NULL;
 146         usbdev = priv->usbdev;
 147         if (!usbdev)
 148                 return NULL;
 149         rq = kzalloc(sizeof(struct uss720_async_request), mem_flags);
 150         if (!rq)
 151                 return NULL;
 152         kref_init(&rq->ref_count);
 153         INIT_LIST_HEAD(&rq->asynclist);
 154         init_completion(&rq->compl);
 155         kref_get(&priv->ref_count);
 156         rq->priv = priv;
 157         rq->urb = usb_alloc_urb(0, mem_flags);
 158         if (!rq->urb) {
 159                 kref_put(&rq->ref_count, destroy_async);
 160                 return NULL;
 161         }
 162         rq->dr = kmalloc(sizeof(*rq->dr), mem_flags);
 163         if (!rq->dr) {
 164                 kref_put(&rq->ref_count, destroy_async);
 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         kref_get(&rq->ref_count);
 180         ret = usb_submit_urb(rq->urb, mem_flags);
 181         if (!ret)
 182                 return rq;
 183         destroy_async(&rq->ref_count);
 184         dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
 185         return NULL;
 186 }
 187
 188 static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
 189 {
 190         struct uss720_async_request *rq;
 191         unsigned long flags;
 192         unsigned int ret = 0;
 193
 194         spin_lock_irqsave(&priv->asynclock, flags);
 195         list_for_each_entry(rq, &priv->asynclist, asynclist) {
 196                 usb_unlink_urb(rq->urb);
 197                 ret++;
 198         }
 199         spin_unlock_irqrestore(&priv->asynclock, flags);
 200         return ret;
 201 }
 202
 203 /* --------------------------------------------------------------------- */
 204
 205 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
 206 {
 207         struct parport_uss720_private *priv;
 208         struct uss720_async_request *rq;
 209         static const unsigned char regindex[9] = {
 210                 4, 0, 1, 5, 5, 0, 2, 3, 6
 211         };
 212         int ret;
 213
 214         if (!pp)
 215                 return -EIO;
 216         priv = pp->private_data;
 217         rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
 218         if (!rq) {
 219                 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
 220                         (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                         printk(KERN_WARNING "get_1284_register: "
 232                                "usb error %d\n", ret);
 233                 kref_put(&rq->ref_count, destroy_async);
 234                 return ret;
 235         }
 236         printk(KERN_WARNING "get_1284_register timeout\n");
 237         kill_all_async_requests_priv(priv);
 238         return -EIO;
 239 }
 240
 241 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
 242 {
 243         struct parport_uss720_private *priv;
 244         struct uss720_async_request *rq;
 245
 246         if (!pp)
 247                 return -EIO;
 248         priv = pp->private_data;
 249         rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
 250         if (!rq) {
 251                 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
 252                         (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_ATOMIC))
 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_ATOMIC))
 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_endpoint_descriptor *epd;
 689         struct parport_uss720_private *priv;
 690         struct parport *pp;
 691         unsigned char reg;
 692         int i;
 693
 694         dev_dbg(&intf->dev, "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         dev_dbg(&intf->dev, "set interface result %d\n", i);
 705
 706         interface = intf->cur_altsetting;
 707
 708         if (interface->desc.bNumEndpoints < 3) {
 709                 usb_put_dev(usbdev);
 710                 return -ENODEV;
 711         }
 712
 713         /*
 714          * Allocate parport interface
 715          */
 716         priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL);
 717         if (!priv) {
 718                 usb_put_dev(usbdev);
 719                 return -ENOMEM;
 720         }
 721         priv->pp = NULL;
 722         priv->usbdev = usbdev;
 723         kref_init(&priv->ref_count);
 724         spin_lock_init(&priv->asynclock);
 725         INIT_LIST_HEAD(&priv->asynclist);
 726         pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops);
 727         if (!pp) {
 728                 printk(KERN_WARNING "uss720: could not register parport\n");
 729                 goto probe_abort;
 730         }
 731
 732         priv->pp = pp;
 733         pp->private_data = priv;
 734         pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
 735
 736         /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
 737         set_1284_register(pp, 7, 0x00, GFP_KERNEL);
 738         set_1284_register(pp, 6, 0x30, GFP_KERNEL);  /* PS/2 mode */
 739         set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
 740         /* debugging */
 741         get_1284_register(pp, 0, &reg, GFP_KERNEL);
 742         dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg);
 743
 744         i = usb_find_last_int_in_endpoint(interface, &epd);
 745         if (!i) {
 746                 dev_dbg(&intf->dev, "epaddr %d interval %d\n",
 747                                 epd->bEndpointAddress, epd->bInterval);
 748         }
 749         parport_announce_port(pp);
 750
 751         usb_set_intfdata(intf, pp);
 752         usb_put_dev(usbdev);
 753         return 0;
 754
 755 probe_abort:
 756         kill_all_async_requests_priv(priv);
 757         kref_put(&priv->ref_count, destroy_priv);
 758         return -ENODEV;
 759 }
 760
 761 static void uss720_disconnect(struct usb_interface *intf)
 762 {
 763         struct parport *pp = usb_get_intfdata(intf);
 764         struct parport_uss720_private *priv;
 765         struct usb_device *usbdev;
 766
 767         dev_dbg(&intf->dev, "disconnect\n");
 768         usb_set_intfdata(intf, NULL);
 769         if (pp) {
 770                 priv = pp->private_data;
 771                 usbdev = priv->usbdev;
 772                 priv->usbdev = NULL;
 773                 priv->pp = NULL;
 774                 dev_dbg(&intf->dev, "parport_remove_port\n");
 775                 parport_remove_port(pp);
 776                 parport_put_port(pp);
 777                 kill_all_async_requests_priv(priv);
 778                 kref_put(&priv->ref_count, destroy_priv);
 779         }
 780         dev_dbg(&intf->dev, "disconnect done\n");
 781 }
 782
 783 /* table of cables that work through this driver */
 784 static const struct usb_device_id uss720_table[] = {
 785         { USB_DEVICE(0x047e, 0x1001) },
 786         { USB_DEVICE(0x0557, 0x2001) },
 787         { USB_DEVICE(0x0729, 0x1284) },
 788         { USB_DEVICE(0x1293, 0x0002) },
 789         { USB_DEVICE(0x050d, 0x0002) },
 790         { }                                             /* Terminating entry */
 791 };
 792
 793 MODULE_DEVICE_TABLE (usb, uss720_table);
 794
 795
 796 static struct usb_driver uss720_driver = {
 797         .name =         "uss720",
 798         .probe =        uss720_probe,
 799         .disconnect =   uss720_disconnect,
 800         .id_table =     uss720_table,
 801 };
 802
 803 /* --------------------------------------------------------------------- */
 804
 805 MODULE_AUTHOR(DRIVER_AUTHOR);
 806 MODULE_DESCRIPTION(DRIVER_DESC);
 807 MODULE_LICENSE("GPL");
 808
 809 static int __init uss720_init(void)
 810 {
 811         int retval;
 812         retval = usb_register(&uss720_driver);
 813         if (retval)
 814                 goto out;
 815
 816         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
 817         printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose "
 818                "driver to allow nonstandard\n");
 819         printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over "
 820                "USS720 usb to parallel cables\n");
 821         printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a "
 822                "printer, use usblp instead\n");
 823 out:
 824         return retval;
 825 }
 826
 827 static void __exit uss720_cleanup(void)
 828 {
 829         usb_deregister(&uss720_driver);
 830 }
 831
 832 module_init(uss720_init);
 833 module_exit(uss720_cleanup);
 834
 835 /* --------------------------------------------------------------------- */