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