drivers/usb/misc/uss720.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*****************************************************************************/
   3
   4 /*
   5  *      uss720.c  --  USS720 USB Parport Cable.
   6  *
   7  *      Copyright (C) 1999, 2005, 2010
   8  *          Thomas Sailer (t.sailer@alumni.ethz.ch)
   9  *
  10  *  Based on parport_pc.c
  11  *
  12  *  History:
  13  *   0.1  04.08.1999  Created
  14  *   0.2  07.08.1999  Some fixes mainly suggested by Tim Waugh
  15  *                    Interrupt handling currently disabled because
  16  *                    usb_request_irq crashes somewhere within ohci.c
  17  *                    for no apparent reason (that is for me, anyway)
  18  *                    ECP currently untested
  19  *   0.3  10.08.1999  fixing merge errors
  20  *   0.4  13.08.1999  Added Vendor/Product ID of Brad Hard's cable
  21  *   0.5  20.09.1999  usb_control_msg wrapper used
  22  *        Nov01.2000  usb_device_table support by Adam J. Richter
  23  *        08.04.2001  Identify version on module load.  gb
  24  *   0.6  02.09.2005  Fix "scheduling in interrupt" problem by making save/restore
  25  *                    context asynchronous
  26  *
  27  */
  28
  29 /*****************************************************************************/
  30
  31 #include <linux/module.h>
  32 #include <linux/socket.h>
  33 #include <linux/parport.h>
  34 #include <linux/init.h>
  35 #include <linux/usb.h>
  36 #include <linux/delay.h>
  37 #include <linux/completion.h>
  38 #include <linux/kref.h>
  39 #include <linux/slab.h>
  40 #include <linux/sched/signal.h>
  41
  42 #define DRIVER_AUTHOR "Thomas M. Sailer, t.sailer@alumni.ethz.ch"
  43 #define DRIVER_DESC "USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip"
  44
  45 /* --------------------------------------------------------------------- */
  46
  47 struct parport_uss720_private {
  48         struct usb_device *usbdev;
  49         struct parport *pp;
  50         struct kref ref_count;
  51         __u8 reg[7];  /* USB registers */
  52         struct list_head asynclist;
  53         spinlock_t asynclock;
  54 };
  55
  56 struct uss720_async_request {
  57         struct parport_uss720_private *priv;
  58         struct kref ref_count;
  59         struct list_head asynclist;
  60         struct completion compl;
  61         struct urb *urb;
  62         struct usb_ctrlrequest *dr;
  63         __u8 reg[7];
  64 };
  65
  66 /* --------------------------------------------------------------------- */
  67
  68 static void destroy_priv(struct kref *kref)
  69 {
  70         struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count);
  71
  72         dev_dbg(&priv->usbdev->dev, "destroying priv datastructure\n");
  73         usb_put_dev(priv->usbdev);
  74         kfree(priv);
  75 }
  76
  77 static void destroy_async(struct kref *kref)
  78 {
  79         struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count);
  80         struct parport_uss720_private *priv = rq->priv;
  81         unsigned long flags;
  82
  83         if (likely(rq->urb))
  84                 usb_free_urb(rq->urb);
  85         kfree(rq->dr);
  86         spin_lock_irqsave(&priv->asynclock, flags);
  87         list_del_init(&rq->asynclist);
  88         spin_unlock_irqrestore(&priv->asynclock, flags);
  89         kfree(rq);
  90         kref_put(&priv->ref_count, destroy_priv);
  91 }
  92
  93 /* --------------------------------------------------------------------- */
  94
  95 static void async_complete(struct urb *urb)
  96 {
  97         struct uss720_async_request *rq;
  98         struct parport *pp;
  99         struct parport_uss720_private *priv;
 100         int status = urb->status;
 101
 102         rq = urb->context;
 103         priv = rq->priv;
 104         pp = priv->pp;
 105         if (status) {
 106                 dev_err(&urb->dev->dev, "async_complete: urb error %d\n",
 107                         status);
 108         } else if (rq->dr->bRequest == 3) {
 109                 memcpy(priv->reg, rq->reg, sizeof(priv->reg));
 110 #if 0
 111                 dev_dbg(&priv->usbdev->dev, "async_complete regs %7ph\n",
 112                         priv->reg);
 113 #endif
 114                 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
 115                 if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
 116                         parport_generic_irq(pp);
 117         }
 118         complete(&rq->compl);
 119         kref_put(&rq->ref_count, destroy_async);
 120 }
 121
 122 static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
 123                                                          __u8 request, __u8 requesttype, __u16 value, __u16 index,
 124                                                          gfp_t mem_flags)
 125 {
 126         struct usb_device *usbdev;
 127         struct uss720_async_request *rq;
 128         unsigned long flags;
 129         int ret;
 130
 131         if (!priv)
 132                 return NULL;
 133         usbdev = priv->usbdev;
 134         if (!usbdev)
 135                 return NULL;
 136         rq = kzalloc(sizeof(struct uss720_async_request), mem_flags);
 137         if (!rq)
 138                 return NULL;
 139         kref_init(&rq->ref_count);
 140         INIT_LIST_HEAD(&rq->asynclist);
 141         init_completion(&rq->compl);
 142         kref_get(&priv->ref_count);
 143         rq->priv = priv;
 144         rq->urb = usb_alloc_urb(0, mem_flags);
 145         if (!rq->urb) {
 146                 kref_put(&rq->ref_count, destroy_async);
 147                 return NULL;
 148         }
 149         rq->dr = kmalloc(sizeof(*rq->dr), mem_flags);
 150         if (!rq->dr) {
 151                 kref_put(&rq->ref_count, destroy_async);
 152                 return NULL;
 153         }
 154         rq->dr->bRequestType = requesttype;
 155         rq->dr->bRequest = request;
 156         rq->dr->wValue = cpu_to_le16(value);
 157         rq->dr->wIndex = cpu_to_le16(index);
 158         rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
 159         usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
 160                              (unsigned char *)rq->dr,
 161                              (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
 162         /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
 163         spin_lock_irqsave(&priv->asynclock, flags);
 164         list_add_tail(&rq->asynclist, &priv->asynclist);
 165         spin_unlock_irqrestore(&priv->asynclock, flags);
 166         kref_get(&rq->ref_count);
 167         ret = usb_submit_urb(rq->urb, mem_flags);
 168         if (!ret)
 169                 return rq;
 170         destroy_async(&rq->ref_count);
 171         dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
 172         return NULL;
 173 }
 174
 175 static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
 176 {
 177         struct uss720_async_request *rq;
 178         unsigned long flags;
 179         unsigned int ret = 0;
 180
 181         spin_lock_irqsave(&priv->asynclock, flags);
 182         list_for_each_entry(rq, &priv->asynclist, asynclist) {
 183                 usb_unlink_urb(rq->urb);
 184                 ret++;
 185         }
 186         spin_unlock_irqrestore(&priv->asynclock, flags);
 187         return ret;
 188 }
 189
 190 /* --------------------------------------------------------------------- */
 191
 192 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
 193 {
 194         struct parport_uss720_private *priv;
 195         struct uss720_async_request *rq;
 196         static const unsigned char regindex[9] = {
 197                 4, 0, 1, 5, 5, 0, 2, 3, 6
 198         };
 199         int ret;
 200
 201         if (!pp)
 202                 return -EIO;
 203         priv = pp->private_data;
 204         rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
 205         if (!rq) {
 206                 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
 207                         (unsigned int)reg);
 208                 return -EIO;
 209         }
 210         if (!val) {
 211                 kref_put(&rq->ref_count, destroy_async);
 212                 return 0;
 213         }
 214         if (wait_for_completion_timeout(&rq->compl, HZ)) {
 215                 ret = rq->urb->status;
 216                 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
 217                 if (ret)
 218                         printk(KERN_WARNING "get_1284_register: "
 219                                "usb error %d\n", ret);
 220                 kref_put(&rq->ref_count, destroy_async);
 221                 return ret;
 222         }
 223         printk(KERN_WARNING "get_1284_register timeout\n");
 224         kill_all_async_requests_priv(priv);
 225         return -EIO;
 226 }
 227
 228 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
 229 {
 230         struct parport_uss720_private *priv;
 231         struct uss720_async_request *rq;
 232
 233         if (!pp)
 234                 return -EIO;
 235         priv = pp->private_data;
 236         rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
 237         if (!rq) {
 238                 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
 239                         (unsigned int)reg, (unsigned int)val);
 240                 return -EIO;
 241         }
 242         kref_put(&rq->ref_count, destroy_async);
 243         return 0;
 244 }
 245
 246 /* --------------------------------------------------------------------- */
 247
 248 /* ECR modes */
 249 #define ECR_SPP 00
 250 #define ECR_PS2 01
 251 #define ECR_PPF 02
 252 #define ECR_ECP 03
 253 #define ECR_EPP 04
 254
 255 /* Safely change the mode bits in the ECR */
 256 static int change_mode(struct parport *pp, int m)
 257 {
 258         struct parport_uss720_private *priv = pp->private_data;
 259         int mode;
 260         __u8 reg;
 261
 262         if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 263                 return -EIO;
 264         /* Bits <7:5> contain the mode. */
 265         mode = (priv->reg[2] >> 5) & 0x7;
 266         if (mode == m)
 267                 return 0;
 268         /* We have to go through mode 000 or 001 */
 269         if (mode > ECR_PS2 && m > ECR_PS2)
 270                 if (change_mode(pp, ECR_PS2))
 271                         return -EIO;
 272
 273         if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
 274                 /* This mode resets the FIFO, so we may
 275                  * have to wait for it to drain first. */
 276                 unsigned long expire = jiffies + pp->physport->cad->timeout;
 277                 switch (mode) {
 278                 case ECR_PPF: /* Parallel Port FIFO mode */
 279                 case ECR_ECP: /* ECP Parallel Port mode */
 280                         /* Poll slowly. */
 281                         for (;;) {
 282                                 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 283                                         return -EIO;
 284                                 if (priv->reg[2] & 0x01)
 285                                         break;
 286                                 if (time_after_eq (jiffies, expire))
 287                                         /* The FIFO is stuck. */
 288                                         return -EBUSY;
 289                                 msleep_interruptible(10);
 290                                 if (signal_pending (current))
 291                                         break;
 292                         }
 293                 }
 294         }
 295         /* Set the mode. */
 296         if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
 297                 return -EIO;
 298         if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 299                 return -EIO;
 300         return 0;
 301 }
 302
 303 /*
 304  * Clear TIMEOUT BIT in EPP MODE
 305  */
 306 static int clear_epp_timeout(struct parport *pp)
 307 {
 308         unsigned char stat;
 309
 310         if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
 311                 return 1;
 312         return stat & 1;
 313 }
 314
 315 /*
 316  * Access functions.
 317  */
 318 #if 0
 319 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
 320 {
 321         struct parport *pp = (struct parport *)dev_id;
 322         struct parport_uss720_private *priv = pp->private_data;
 323
 324         if (usbstatus != 0 || len < 4 || !buffer)
 325                 return 1;
 326         memcpy(priv->reg, buffer, 4);
 327         /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
 328         if (priv->reg[2] & priv->reg[1] & 0x10)
 329                 parport_generic_irq(pp);
 330         return 1;
 331 }
 332 #endif
 333
 334 static void parport_uss720_write_data(struct parport *pp, unsigned char d)
 335 {
 336         set_1284_register(pp, 0, d, GFP_KERNEL);
 337 }
 338
 339 static unsigned char parport_uss720_read_data(struct parport *pp)
 340 {
 341         unsigned char ret;
 342
 343         if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
 344                 return 0;
 345         return ret;
 346 }
 347
 348 static void parport_uss720_write_control(struct parport *pp, unsigned char d)
 349 {
 350         struct parport_uss720_private *priv = pp->private_data;
 351
 352         d = (d & 0xf) | (priv->reg[1] & 0xf0);
 353         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 354                 return;
 355         priv->reg[1] = d;
 356 }
 357
 358 static unsigned char parport_uss720_read_control(struct parport *pp)
 359 {
 360         struct parport_uss720_private *priv = pp->private_data;
 361         return priv->reg[1] & 0xf; /* Use soft copy */
 362 }
 363
 364 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
 365 {
 366         struct parport_uss720_private *priv = pp->private_data;
 367         unsigned char d;
 368
 369         mask &= 0x0f;
 370         val &= 0x0f;
 371         d = (priv->reg[1] & (~mask)) ^ val;
 372         if (set_1284_register(pp, 2, d, GFP_ATOMIC))
 373                 return 0;
 374         priv->reg[1] = d;
 375         return d & 0xf;
 376 }
 377
 378 static unsigned char parport_uss720_read_status(struct parport *pp)
 379 {
 380         unsigned char ret;
 381
 382         if (get_1284_register(pp, 1, &ret, GFP_ATOMIC))
 383                 return 0;
 384         return ret & 0xf8;
 385 }
 386
 387 static void parport_uss720_disable_irq(struct parport *pp)
 388 {
 389         struct parport_uss720_private *priv = pp->private_data;
 390         unsigned char d;
 391
 392         d = priv->reg[1] & ~0x10;
 393         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 394                 return;
 395         priv->reg[1] = d;
 396 }
 397
 398 static void parport_uss720_enable_irq(struct parport *pp)
 399 {
 400         struct parport_uss720_private *priv = pp->private_data;
 401         unsigned char d;
 402
 403         d = priv->reg[1] | 0x10;
 404         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 405                 return;
 406         priv->reg[1] = d;
 407 }
 408
 409 static void parport_uss720_data_forward (struct parport *pp)
 410 {
 411         struct parport_uss720_private *priv = pp->private_data;
 412         unsigned char d;
 413
 414         d = priv->reg[1] & ~0x20;
 415         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 416                 return;
 417         priv->reg[1] = d;
 418 }
 419
 420 static void parport_uss720_data_reverse (struct parport *pp)
 421 {
 422         struct parport_uss720_private *priv = pp->private_data;
 423         unsigned char d;
 424
 425         d = priv->reg[1] | 0x20;
 426         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 427                 return;
 428         priv->reg[1] = d;
 429 }
 430
 431 static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
 432 {
 433         s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
 434         s->u.pc.ecr = 0x24;
 435 }
 436
 437 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
 438 {
 439         struct parport_uss720_private *priv = pp->private_data;
 440
 441 #if 0
 442         if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
 443                 return;
 444 #endif
 445         s->u.pc.ctr = priv->reg[1];
 446         s->u.pc.ecr = priv->reg[2];
 447 }
 448
 449 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
 450 {
 451         struct parport_uss720_private *priv = pp->private_data;
 452
 453         set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
 454         set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
 455         get_1284_register(pp, 2, NULL, GFP_ATOMIC);
 456         priv->reg[1] = s->u.pc.ctr;
 457         priv->reg[2] = s->u.pc.ecr;
 458 }
 459
 460 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
 461 {
 462         struct parport_uss720_private *priv = pp->private_data;
 463         size_t got = 0;
 464
 465         if (change_mode(pp, ECR_EPP))
 466                 return 0;
 467         for (; got < length; got++) {
 468                 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
 469                         break;
 470                 buf++;
 471                 if (priv->reg[0] & 0x01) {
 472                         clear_epp_timeout(pp);
 473                         break;
 474                 }
 475         }
 476         change_mode(pp, ECR_PS2);
 477         return got;
 478 }
 479
 480 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
 481 {
 482 #if 0
 483         struct parport_uss720_private *priv = pp->private_data;
 484         size_t written = 0;
 485
 486         if (change_mode(pp, ECR_EPP))
 487                 return 0;
 488         for (; written < length; written++) {
 489                 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
 490                         break;
 491                 ((char*)buf)++;
 492                 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
 493                         break;
 494                 if (priv->reg[0] & 0x01) {
 495                         clear_epp_timeout(pp);
 496                         break;
 497                 }
 498         }
 499         change_mode(pp, ECR_PS2);
 500         return written;
 501 #else
 502         struct parport_uss720_private *priv = pp->private_data;
 503         struct usb_device *usbdev = priv->usbdev;
 504         int rlen;
 505         int i;
 506
 507         if (!usbdev)
 508                 return 0;
 509         if (change_mode(pp, ECR_EPP))
 510                 return 0;
 511         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
 512         if (i)
 513                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buf, length, rlen);
 514         change_mode(pp, ECR_PS2);
 515         return rlen;
 516 #endif
 517 }
 518
 519 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
 520 {
 521         struct parport_uss720_private *priv = pp->private_data;
 522         size_t got = 0;
 523
 524         if (change_mode(pp, ECR_EPP))
 525                 return 0;
 526         for (; got < length; got++) {
 527                 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
 528                         break;
 529                 buf++;
 530                 if (priv->reg[0] & 0x01) {
 531                         clear_epp_timeout(pp);
 532                         break;
 533                 }
 534         }
 535         change_mode(pp, ECR_PS2);
 536         return got;
 537 }
 538
 539 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
 540 {
 541         struct parport_uss720_private *priv = pp->private_data;
 542         size_t written = 0;
 543
 544         if (change_mode(pp, ECR_EPP))
 545                 return 0;
 546         for (; written < length; written++) {
 547                 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
 548                         break;
 549                 buf++;
 550                 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
 551                         break;
 552                 if (priv->reg[0] & 0x01) {
 553                         clear_epp_timeout(pp);
 554                         break;
 555                 }
 556         }
 557         change_mode(pp, ECR_PS2);
 558         return written;
 559 }
 560
 561 static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
 562 {
 563         struct parport_uss720_private *priv = pp->private_data;
 564         struct usb_device *usbdev = priv->usbdev;
 565         int rlen;
 566         int i;
 567
 568         if (!usbdev)
 569                 return 0;
 570         if (change_mode(pp, ECR_ECP))
 571                 return 0;
 572         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
 573         if (i)
 574                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen);
 575         change_mode(pp, ECR_PS2);
 576         return rlen;
 577 }
 578
 579 static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
 580 {
 581         struct parport_uss720_private *priv = pp->private_data;
 582         struct usb_device *usbdev = priv->usbdev;
 583         int rlen;
 584         int i;
 585
 586         if (!usbdev)
 587                 return 0;
 588         if (change_mode(pp, ECR_ECP))
 589                 return 0;
 590         i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
 591         if (i)
 592                 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %zu rlen %u\n", buffer, len, rlen);
 593         change_mode(pp, ECR_PS2);
 594         return rlen;
 595 }
 596
 597 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
 598 {
 599         size_t written = 0;
 600
 601         if (change_mode(pp, ECR_ECP))
 602                 return 0;
 603         for (; written < len; written++) {
 604                 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
 605                         break;
 606                 buffer++;
 607         }
 608         change_mode(pp, ECR_PS2);
 609         return written;
 610 }
 611
 612 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
 613 {
 614         struct parport_uss720_private *priv = pp->private_data;
 615         struct usb_device *usbdev = priv->usbdev;
 616         int rlen;
 617         int i;
 618
 619         if (!usbdev)
 620                 return 0;
 621         if (change_mode(pp, ECR_PPF))
 622                 return 0;
 623         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
 624         if (i)
 625                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen);
 626         change_mode(pp, ECR_PS2);
 627         return rlen;
 628 }
 629
 630 /* --------------------------------------------------------------------- */
 631
 632 static struct parport_operations parport_uss720_ops =
 633 {
 634         .owner =                THIS_MODULE,
 635         .write_data =           parport_uss720_write_data,
 636         .read_data =            parport_uss720_read_data,
 637
 638         .write_control =        parport_uss720_write_control,
 639         .read_control =         parport_uss720_read_control,
 640         .frob_control =         parport_uss720_frob_control,
 641
 642         .read_status =          parport_uss720_read_status,
 643
 644         .enable_irq =           parport_uss720_enable_irq,
 645         .disable_irq =          parport_uss720_disable_irq,
 646
 647         .data_forward =         parport_uss720_data_forward,
 648         .data_reverse =         parport_uss720_data_reverse,
 649
 650         .init_state =           parport_uss720_init_state,
 651         .save_state =           parport_uss720_save_state,
 652         .restore_state =        parport_uss720_restore_state,
 653
 654         .epp_write_data =       parport_uss720_epp_write_data,
 655         .epp_read_data =        parport_uss720_epp_read_data,
 656         .epp_write_addr =       parport_uss720_epp_write_addr,
 657         .epp_read_addr =        parport_uss720_epp_read_addr,
 658
 659         .ecp_write_data =       parport_uss720_ecp_write_data,
 660         .ecp_read_data =        parport_uss720_ecp_read_data,
 661         .ecp_write_addr =       parport_uss720_ecp_write_addr,
 662
 663         .compat_write_data =    parport_uss720_write_compat,
 664         .nibble_read_data =     parport_ieee1284_read_nibble,
 665         .byte_read_data =       parport_ieee1284_read_byte,
 666 };
 667
 668 /* --------------------------------------------------------------------- */
 669
 670 static int uss720_probe(struct usb_interface *intf,
 671                         const struct usb_device_id *id)
 672 {
 673         struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
 674         struct usb_host_interface *interface;
 675         struct usb_endpoint_descriptor *epd;
 676         struct parport_uss720_private *priv;
 677         struct parport *pp;
 678         unsigned char reg;
 679         int i;
 680
 681         dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n",
 682                 le16_to_cpu(usbdev->descriptor.idVendor),
 683                 le16_to_cpu(usbdev->descriptor.idProduct));
 684
 685         /* our known interfaces have 3 alternate settings */
 686         if (intf->num_altsetting != 3) {
 687                 usb_put_dev(usbdev);
 688                 return -ENODEV;
 689         }
 690         i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
 691         dev_dbg(&intf->dev, "set interface result %d\n", i);
 692
 693         interface = intf->cur_altsetting;
 694
 695         if (interface->desc.bNumEndpoints < 3) {
 696                 usb_put_dev(usbdev);
 697                 return -ENODEV;
 698         }
 699
 700         /*
 701          * Allocate parport interface
 702          */
 703         priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL);
 704         if (!priv) {
 705                 usb_put_dev(usbdev);
 706                 return -ENOMEM;
 707         }
 708         priv->pp = NULL;
 709         priv->usbdev = usbdev;
 710         kref_init(&priv->ref_count);
 711         spin_lock_init(&priv->asynclock);
 712         INIT_LIST_HEAD(&priv->asynclist);
 713         pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops);
 714         if (!pp) {
 715                 printk(KERN_WARNING "uss720: could not register parport\n");
 716                 goto probe_abort;
 717         }
 718
 719         priv->pp = pp;
 720         pp->private_data = priv;
 721         pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
 722
 723         /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
 724         set_1284_register(pp, 7, 0x00, GFP_KERNEL);
 725         set_1284_register(pp, 6, 0x30, GFP_KERNEL);  /* PS/2 mode */
 726         set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
 727         /* debugging */
 728         get_1284_register(pp, 0, &reg, GFP_KERNEL);
 729         dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg);
 730
 731         i = usb_find_last_int_in_endpoint(interface, &epd);
 732         if (!i) {
 733                 dev_dbg(&intf->dev, "epaddr %d interval %d\n",
 734                                 epd->bEndpointAddress, epd->bInterval);
 735         }
 736         parport_announce_port(pp);
 737
 738         usb_set_intfdata(intf, pp);
 739         return 0;
 740
 741 probe_abort:
 742         kill_all_async_requests_priv(priv);
 743         kref_put(&priv->ref_count, destroy_priv);
 744         return -ENODEV;
 745 }
 746
 747 static void uss720_disconnect(struct usb_interface *intf)
 748 {
 749         struct parport *pp = usb_get_intfdata(intf);
 750         struct parport_uss720_private *priv;
 751
 752         dev_dbg(&intf->dev, "disconnect\n");
 753         usb_set_intfdata(intf, NULL);
 754         if (pp) {
 755                 priv = pp->private_data;
 756                 priv->usbdev = NULL;
 757                 priv->pp = NULL;
 758                 dev_dbg(&intf->dev, "parport_remove_port\n");
 759                 parport_remove_port(pp);
 760                 parport_put_port(pp);
 761                 kill_all_async_requests_priv(priv);
 762                 kref_put(&priv->ref_count, destroy_priv);
 763         }
 764         dev_dbg(&intf->dev, "disconnect done\n");
 765 }
 766
 767 /* table of cables that work through this driver */
 768 static const struct usb_device_id uss720_table[] = {
 769         { USB_DEVICE(0x047e, 0x1001) },
 770         { USB_DEVICE(0x04b8, 0x0002) },
 771         { USB_DEVICE(0x04b8, 0x0003) },
 772         { USB_DEVICE(0x050d, 0x0002) },
 773         { USB_DEVICE(0x050d, 0x1202) },
 774         { USB_DEVICE(0x0557, 0x2001) },
 775         { USB_DEVICE(0x05ab, 0x0002) },
 776         { USB_DEVICE(0x06c6, 0x0100) },
 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_DESC "\n");
 806         printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose "
 807                "driver to allow nonstandard\n");
 808         printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over "
 809                "USS720 usb to parallel cables\n");
 810         printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a "
 811                "printer, use usblp instead\n");
 812 out:
 813         return retval;
 814 }
 815
 816 static void __exit uss720_cleanup(void)
 817 {
 818         usb_deregister(&uss720_driver);
 819 }
 820
 821 module_init(uss720_init);
 822 module_exit(uss720_cleanup);
 823
 824 /* --------------------------------------------------------------------- */