drivers/usb/misc/uss720.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      uss720.c  --  USS720 USB Parport Cable.
   5  *
   6  *      Copyright (C) 1999, 2005, 2010
   7  *          Thomas Sailer (t.sailer@alumni.ethz.ch)
   8  *
   9  *      This program is free software; you can redistribute it and/or modify
  10  *      it under the terms of the GNU General Public License as published by
  11  *      the Free Software Foundation; either version 2 of the License, or
  12  *      (at your option) any later version.
  13  *
  14  *      This program is distributed in the hope that it will be useful,
  15  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *      GNU General Public License for more details.
  18  *
  19  *      You should have received a copy of the GNU General Public License
  20  *      along with this program; if not, write to the Free Software
  21  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  *  Based on parport_pc.c
  24  *
  25  *  History:
  26  *   0.1  04.08.1999  Created
  27  *   0.2  07.08.1999  Some fixes mainly suggested by Tim Waugh
  28  *                    Interrupt handling currently disabled because
  29  *                    usb_request_irq crashes somewhere within ohci.c
  30  *                    for no apparent reason (that is for me, anyway)
  31  *                    ECP currently untested
  32  *   0.3  10.08.1999  fixing merge errors
  33  *   0.4  13.08.1999  Added Vendor/Product ID of Brad Hard's cable
  34  *   0.5  20.09.1999  usb_control_msg wrapper used
  35  *        Nov01.2000  usb_device_table support by Adam J. Richter
  36  *        08.04.2001  Identify version on module load.  gb
  37  *   0.6  02.09.2005  Fix "scheduling in interrupt" problem by making save/restore
  38  *                    context asynchronous
  39  *
  40  */
  41
  42 /*****************************************************************************/
  43
  44 #include <linux/module.h>
  45 #include <linux/socket.h>
  46 #include <linux/parport.h>
  47 #include <linux/init.h>
  48 #include <linux/usb.h>
  49 #include <linux/delay.h>
  50 #include <linux/completion.h>
  51 #include <linux/kref.h>
  52 #include <linux/slab.h>
  53
  54 /*
  55  * Version Information
  56  */
  57 #define DRIVER_VERSION "v0.6"
  58 #define DRIVER_AUTHOR "Thomas M. Sailer, t.sailer@alumni.ethz.ch"
  59 #define DRIVER_DESC "USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip"
  60
  61 /* --------------------------------------------------------------------- */
  62
  63 struct parport_uss720_private {
  64         struct usb_device *usbdev;
  65         struct parport *pp;
  66         struct kref ref_count;
  67         __u8 reg[7];  /* USB registers */
  68         struct list_head asynclist;
  69         spinlock_t asynclock;
  70 };
  71
  72 struct uss720_async_request {
  73         struct parport_uss720_private *priv;
  74         struct kref ref_count;
  75         struct list_head asynclist;
  76         struct completion compl;
  77         struct urb *urb;
  78         struct usb_ctrlrequest *dr;
  79         __u8 reg[7];
  80 };
  81
  82 /* --------------------------------------------------------------------- */
  83
  84 static void destroy_priv(struct kref *kref)
  85 {
  86         struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count);
  87
  88         dev_dbg(&priv->usbdev->dev, "destroying priv datastructure\n");
  89         usb_put_dev(priv->usbdev);
  90         kfree(priv);
  91 }
  92
  93 static void destroy_async(struct kref *kref)
  94 {
  95         struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count);
  96         struct parport_uss720_private *priv = rq->priv;
  97         unsigned long flags;
  98
  99         if (likely(rq->urb))
 100                 usb_free_urb(rq->urb);
 101         kfree(rq->dr);
 102         spin_lock_irqsave(&priv->asynclock, flags);
 103         list_del_init(&rq->asynclist);
 104         spin_unlock_irqrestore(&priv->asynclock, flags);
 105         kfree(rq);
 106         kref_put(&priv->ref_count, destroy_priv);
 107 }
 108
 109 /* --------------------------------------------------------------------- */
 110
 111 static void async_complete(struct urb *urb)
 112 {
 113         struct uss720_async_request *rq;
 114         struct parport *pp;
 115         struct parport_uss720_private *priv;
 116         int status = urb->status;
 117
 118         rq = urb->context;
 119         priv = rq->priv;
 120         pp = priv->pp;
 121         if (status) {
 122                 dev_err(&urb->dev->dev, "async_complete: urb error %d\n",
 123                         status);
 124         } else if (rq->dr->bRequest == 3) {
 125                 memcpy(priv->reg, rq->reg, sizeof(priv->reg));
 126 #if 0
 127                 dev_dbg(&priv->usbdev->dev,
 128                         "async_complete regs %02x %02x %02x %02x %02x %02x %02x\n",
 129                         (unsigned int)priv->reg[0], (unsigned int)priv->reg[1],
 130                         (unsigned int)priv->reg[2], (unsigned int)priv->reg[3],
 131                         (unsigned int)priv->reg[4], (unsigned int)priv->reg[5],
 132                         (unsigned int)priv->reg[6]);
 133 #endif
 134                 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
 135                 if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
 136                         parport_generic_irq(pp);
 137         }
 138         complete(&rq->compl);
 139         kref_put(&rq->ref_count, destroy_async);
 140 }
 141
 142 static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
 143                                                          __u8 request, __u8 requesttype, __u16 value, __u16 index,
 144                                                          gfp_t mem_flags)
 145 {
 146         struct usb_device *usbdev;
 147         struct uss720_async_request *rq;
 148         unsigned long flags;
 149         int ret;
 150
 151         if (!priv)
 152                 return NULL;
 153         usbdev = priv->usbdev;
 154         if (!usbdev)
 155                 return NULL;
 156         rq = kzalloc(sizeof(struct uss720_async_request), mem_flags);
 157         if (!rq) {
 158                 dev_err(&usbdev->dev, "submit_async_request out of memory\n");
 159                 return NULL;
 160         }
 161         kref_init(&rq->ref_count);
 162         INIT_LIST_HEAD(&rq->asynclist);
 163         init_completion(&rq->compl);
 164         kref_get(&priv->ref_count);
 165         rq->priv = priv;
 166         rq->urb = usb_alloc_urb(0, mem_flags);
 167         if (!rq->urb) {
 168                 kref_put(&rq->ref_count, destroy_async);
 169                 dev_err(&usbdev->dev, "submit_async_request out of memory\n");
 170                 return NULL;
 171         }
 172         rq->dr = kmalloc(sizeof(*rq->dr), mem_flags);
 173         if (!rq->dr) {
 174                 kref_put(&rq->ref_count, destroy_async);
 175                 return NULL;
 176         }
 177         rq->dr->bRequestType = requesttype;
 178         rq->dr->bRequest = request;
 179         rq->dr->wValue = cpu_to_le16(value);
 180         rq->dr->wIndex = cpu_to_le16(index);
 181         rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
 182         usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
 183                              (unsigned char *)rq->dr,
 184                              (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
 185         /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
 186         spin_lock_irqsave(&priv->asynclock, flags);
 187         list_add_tail(&rq->asynclist, &priv->asynclist);
 188         spin_unlock_irqrestore(&priv->asynclock, flags);
 189         kref_get(&rq->ref_count);
 190         ret = usb_submit_urb(rq->urb, mem_flags);
 191         if (!ret)
 192                 return rq;
 193         destroy_async(&rq->ref_count);
 194         dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
 195         return NULL;
 196 }
 197
 198 static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
 199 {
 200         struct uss720_async_request *rq;
 201         unsigned long flags;
 202         unsigned int ret = 0;
 203
 204         spin_lock_irqsave(&priv->asynclock, flags);
 205         list_for_each_entry(rq, &priv->asynclist, asynclist) {
 206                 usb_unlink_urb(rq->urb);
 207                 ret++;
 208         }
 209         spin_unlock_irqrestore(&priv->asynclock, flags);
 210         return ret;
 211 }
 212
 213 /* --------------------------------------------------------------------- */
 214
 215 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
 216 {
 217         struct parport_uss720_private *priv;
 218         struct uss720_async_request *rq;
 219         static const unsigned char regindex[9] = {
 220                 4, 0, 1, 5, 5, 0, 2, 3, 6
 221         };
 222         int ret;
 223
 224         if (!pp)
 225                 return -EIO;
 226         priv = pp->private_data;
 227         rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
 228         if (!rq) {
 229                 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
 230                         (unsigned int)reg);
 231                 return -EIO;
 232         }
 233         if (!val) {
 234                 kref_put(&rq->ref_count, destroy_async);
 235                 return 0;
 236         }
 237         if (wait_for_completion_timeout(&rq->compl, HZ)) {
 238                 ret = rq->urb->status;
 239                 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
 240                 if (ret)
 241                         printk(KERN_WARNING "get_1284_register: "
 242                                "usb error %d\n", ret);
 243                 kref_put(&rq->ref_count, destroy_async);
 244                 return ret;
 245         }
 246         printk(KERN_WARNING "get_1284_register timeout\n");
 247         kill_all_async_requests_priv(priv);
 248         return -EIO;
 249 }
 250
 251 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
 252 {
 253         struct parport_uss720_private *priv;
 254         struct uss720_async_request *rq;
 255
 256         if (!pp)
 257                 return -EIO;
 258         priv = pp->private_data;
 259         rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
 260         if (!rq) {
 261                 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
 262                         (unsigned int)reg, (unsigned int)val);
 263                 return -EIO;
 264         }
 265         kref_put(&rq->ref_count, destroy_async);
 266         return 0;
 267 }
 268
 269 /* --------------------------------------------------------------------- */
 270
 271 /* ECR modes */
 272 #define ECR_SPP 00
 273 #define ECR_PS2 01
 274 #define ECR_PPF 02
 275 #define ECR_ECP 03
 276 #define ECR_EPP 04
 277
 278 /* Safely change the mode bits in the ECR */
 279 static int change_mode(struct parport *pp, int m)
 280 {
 281         struct parport_uss720_private *priv = pp->private_data;
 282         int mode;
 283         __u8 reg;
 284
 285         if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 286                 return -EIO;
 287         /* Bits <7:5> contain the mode. */
 288         mode = (priv->reg[2] >> 5) & 0x7;
 289         if (mode == m)
 290                 return 0;
 291         /* We have to go through mode 000 or 001 */
 292         if (mode > ECR_PS2 && m > ECR_PS2)
 293                 if (change_mode(pp, ECR_PS2))
 294                         return -EIO;
 295
 296         if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
 297                 /* This mode resets the FIFO, so we may
 298                  * have to wait for it to drain first. */
 299                 unsigned long expire = jiffies + pp->physport->cad->timeout;
 300                 switch (mode) {
 301                 case ECR_PPF: /* Parallel Port FIFO mode */
 302                 case ECR_ECP: /* ECP Parallel Port mode */
 303                         /* Poll slowly. */
 304                         for (;;) {
 305                                 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 306                                         return -EIO;
 307                                 if (priv->reg[2] & 0x01)
 308                                         break;
 309                                 if (time_after_eq (jiffies, expire))
 310                                         /* The FIFO is stuck. */
 311                                         return -EBUSY;
 312                                 msleep_interruptible(10);
 313                                 if (signal_pending (current))
 314                                         break;
 315                         }
 316                 }
 317         }
 318         /* Set the mode. */
 319         if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
 320                 return -EIO;
 321         if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 322                 return -EIO;
 323         return 0;
 324 }
 325
 326 /*
 327  * Clear TIMEOUT BIT in EPP MODE
 328  */
 329 static int clear_epp_timeout(struct parport *pp)
 330 {
 331         unsigned char stat;
 332
 333         if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
 334                 return 1;
 335         return stat & 1;
 336 }
 337
 338 /*
 339  * Access functions.
 340  */
 341 #if 0
 342 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
 343 {
 344         struct parport *pp = (struct parport *)dev_id;
 345         struct parport_uss720_private *priv = pp->private_data;
 346
 347         if (usbstatus != 0 || len < 4 || !buffer)
 348                 return 1;
 349         memcpy(priv->reg, buffer, 4);
 350         /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
 351         if (priv->reg[2] & priv->reg[1] & 0x10)
 352                 parport_generic_irq(pp);
 353         return 1;
 354 }
 355 #endif
 356
 357 static void parport_uss720_write_data(struct parport *pp, unsigned char d)
 358 {
 359         set_1284_register(pp, 0, d, GFP_KERNEL);
 360 }
 361
 362 static unsigned char parport_uss720_read_data(struct parport *pp)
 363 {
 364         unsigned char ret;
 365
 366         if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
 367                 return 0;
 368         return ret;
 369 }
 370
 371 static void parport_uss720_write_control(struct parport *pp, unsigned char d)
 372 {
 373         struct parport_uss720_private *priv = pp->private_data;
 374
 375         d = (d & 0xf) | (priv->reg[1] & 0xf0);
 376         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 377                 return;
 378         priv->reg[1] = d;
 379 }
 380
 381 static unsigned char parport_uss720_read_control(struct parport *pp)
 382 {
 383         struct parport_uss720_private *priv = pp->private_data;
 384         return priv->reg[1] & 0xf; /* Use soft copy */
 385 }
 386
 387 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
 388 {
 389         struct parport_uss720_private *priv = pp->private_data;
 390         unsigned char d;
 391
 392         mask &= 0x0f;
 393         val &= 0x0f;
 394         d = (priv->reg[1] & (~mask)) ^ val;
 395         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 396                 return 0;
 397         priv->reg[1] = d;
 398         return d & 0xf;
 399 }
 400
 401 static unsigned char parport_uss720_read_status(struct parport *pp)
 402 {
 403         unsigned char ret;
 404
 405         if (get_1284_register(pp, 1, &ret, GFP_KERNEL))
 406                 return 0;
 407         return ret & 0xf8;
 408 }
 409
 410 static void parport_uss720_disable_irq(struct parport *pp)
 411 {
 412         struct parport_uss720_private *priv = pp->private_data;
 413         unsigned char d;
 414
 415         d = priv->reg[1] & ~0x10;
 416         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 417                 return;
 418         priv->reg[1] = d;
 419 }
 420
 421 static void parport_uss720_enable_irq(struct parport *pp)
 422 {
 423         struct parport_uss720_private *priv = pp->private_data;
 424         unsigned char d;
 425
 426         d = priv->reg[1] | 0x10;
 427         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 428                 return;
 429         priv->reg[1] = d;
 430 }
 431
 432 static void parport_uss720_data_forward (struct parport *pp)
 433 {
 434         struct parport_uss720_private *priv = pp->private_data;
 435         unsigned char d;
 436
 437         d = priv->reg[1] & ~0x20;
 438         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 439                 return;
 440         priv->reg[1] = d;
 441 }
 442
 443 static void parport_uss720_data_reverse (struct parport *pp)
 444 {
 445         struct parport_uss720_private *priv = pp->private_data;
 446         unsigned char d;
 447
 448         d = priv->reg[1] | 0x20;
 449         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 450                 return;
 451         priv->reg[1] = d;
 452 }
 453
 454 static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
 455 {
 456         s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
 457         s->u.pc.ecr = 0x24;
 458 }
 459
 460 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
 461 {
 462         struct parport_uss720_private *priv = pp->private_data;
 463
 464 #if 0
 465         if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
 466                 return;
 467 #endif
 468         s->u.pc.ctr = priv->reg[1];
 469         s->u.pc.ecr = priv->reg[2];
 470 }
 471
 472 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
 473 {
 474         struct parport_uss720_private *priv = pp->private_data;
 475
 476         set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
 477         set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
 478         get_1284_register(pp, 2, NULL, GFP_ATOMIC);
 479         priv->reg[1] = s->u.pc.ctr;
 480         priv->reg[2] = s->u.pc.ecr;
 481 }
 482
 483 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
 484 {
 485         struct parport_uss720_private *priv = pp->private_data;
 486         size_t got = 0;
 487
 488         if (change_mode(pp, ECR_EPP))
 489                 return 0;
 490         for (; got < length; got++) {
 491                 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
 492                         break;
 493                 buf++;
 494                 if (priv->reg[0] & 0x01) {
 495                         clear_epp_timeout(pp);
 496                         break;
 497                 }
 498         }
 499         change_mode(pp, ECR_PS2);
 500         return got;
 501 }
 502
 503 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
 504 {
 505 #if 0
 506         struct parport_uss720_private *priv = pp->private_data;
 507         size_t written = 0;
 508
 509         if (change_mode(pp, ECR_EPP))
 510                 return 0;
 511         for (; written < length; written++) {
 512                 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
 513                         break;
 514                 ((char*)buf)++;
 515                 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
 516                         break;
 517                 if (priv->reg[0] & 0x01) {
 518                         clear_epp_timeout(pp);
 519                         break;
 520                 }
 521         }
 522         change_mode(pp, ECR_PS2);
 523         return written;
 524 #else
 525         struct parport_uss720_private *priv = pp->private_data;
 526         struct usb_device *usbdev = priv->usbdev;
 527         int rlen;
 528         int i;
 529
 530         if (!usbdev)
 531                 return 0;
 532         if (change_mode(pp, ECR_EPP))
 533                 return 0;
 534         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
 535         if (i)
 536                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buf, length, rlen);
 537         change_mode(pp, ECR_PS2);
 538         return rlen;
 539 #endif
 540 }
 541
 542 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
 543 {
 544         struct parport_uss720_private *priv = pp->private_data;
 545         size_t got = 0;
 546
 547         if (change_mode(pp, ECR_EPP))
 548                 return 0;
 549         for (; got < length; got++) {
 550                 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
 551                         break;
 552                 buf++;
 553                 if (priv->reg[0] & 0x01) {
 554                         clear_epp_timeout(pp);
 555                         break;
 556                 }
 557         }
 558         change_mode(pp, ECR_PS2);
 559         return got;
 560 }
 561
 562 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
 563 {
 564         struct parport_uss720_private *priv = pp->private_data;
 565         size_t written = 0;
 566
 567         if (change_mode(pp, ECR_EPP))
 568                 return 0;
 569         for (; written < length; written++) {
 570                 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
 571                         break;
 572                 buf++;
 573                 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
 574                         break;
 575                 if (priv->reg[0] & 0x01) {
 576                         clear_epp_timeout(pp);
 577                         break;
 578                 }
 579         }
 580         change_mode(pp, ECR_PS2);
 581         return written;
 582 }
 583
 584 static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
 585 {
 586         struct parport_uss720_private *priv = pp->private_data;
 587         struct usb_device *usbdev = priv->usbdev;
 588         int rlen;
 589         int i;
 590
 591         if (!usbdev)
 592                 return 0;
 593         if (change_mode(pp, ECR_ECP))
 594                 return 0;
 595         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
 596         if (i)
 597                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
 598         change_mode(pp, ECR_PS2);
 599         return rlen;
 600 }
 601
 602 static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
 603 {
 604         struct parport_uss720_private *priv = pp->private_data;
 605         struct usb_device *usbdev = priv->usbdev;
 606         int rlen;
 607         int i;
 608
 609         if (!usbdev)
 610                 return 0;
 611         if (change_mode(pp, ECR_ECP))
 612                 return 0;
 613         i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
 614         if (i)
 615                 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %Zu rlen %u\n", buffer, len, rlen);
 616         change_mode(pp, ECR_PS2);
 617         return rlen;
 618 }
 619
 620 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
 621 {
 622         size_t written = 0;
 623
 624         if (change_mode(pp, ECR_ECP))
 625                 return 0;
 626         for (; written < len; written++) {
 627                 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
 628                         break;
 629                 buffer++;
 630         }
 631         change_mode(pp, ECR_PS2);
 632         return written;
 633 }
 634
 635 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
 636 {
 637         struct parport_uss720_private *priv = pp->private_data;
 638         struct usb_device *usbdev = priv->usbdev;
 639         int rlen;
 640         int i;
 641
 642         if (!usbdev)
 643                 return 0;
 644         if (change_mode(pp, ECR_PPF))
 645                 return 0;
 646         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
 647         if (i)
 648                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
 649         change_mode(pp, ECR_PS2);
 650         return rlen;
 651 }
 652
 653 /* --------------------------------------------------------------------- */
 654
 655 static struct parport_operations parport_uss720_ops =
 656 {
 657         .owner =                THIS_MODULE,
 658         .write_data =           parport_uss720_write_data,
 659         .read_data =            parport_uss720_read_data,
 660
 661         .write_control =        parport_uss720_write_control,
 662         .read_control =         parport_uss720_read_control,
 663         .frob_control =         parport_uss720_frob_control,
 664
 665         .read_status =          parport_uss720_read_status,
 666
 667         .enable_irq =           parport_uss720_enable_irq,
 668         .disable_irq =          parport_uss720_disable_irq,
 669
 670         .data_forward =         parport_uss720_data_forward,
 671         .data_reverse =         parport_uss720_data_reverse,
 672
 673         .init_state =           parport_uss720_init_state,
 674         .save_state =           parport_uss720_save_state,
 675         .restore_state =        parport_uss720_restore_state,
 676
 677         .epp_write_data =       parport_uss720_epp_write_data,
 678         .epp_read_data =        parport_uss720_epp_read_data,
 679         .epp_write_addr =       parport_uss720_epp_write_addr,
 680         .epp_read_addr =        parport_uss720_epp_read_addr,
 681
 682         .ecp_write_data =       parport_uss720_ecp_write_data,
 683         .ecp_read_data =        parport_uss720_ecp_read_data,
 684         .ecp_write_addr =       parport_uss720_ecp_write_addr,
 685
 686         .compat_write_data =    parport_uss720_write_compat,
 687         .nibble_read_data =     parport_ieee1284_read_nibble,
 688         .byte_read_data =       parport_ieee1284_read_byte,
 689 };
 690
 691 /* --------------------------------------------------------------------- */
 692
 693 static int uss720_probe(struct usb_interface *intf,
 694                         const struct usb_device_id *id)
 695 {
 696         struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
 697         struct usb_host_interface *interface;
 698         struct usb_host_endpoint *endpoint;
 699         struct parport_uss720_private *priv;
 700         struct parport *pp;
 701         unsigned char reg;
 702         int i;
 703
 704         dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n",
 705                 le16_to_cpu(usbdev->descriptor.idVendor),
 706                 le16_to_cpu(usbdev->descriptor.idProduct));
 707
 708         /* our known interfaces have 3 alternate settings */
 709         if (intf->num_altsetting != 3) {
 710                 usb_put_dev(usbdev);
 711                 return -ENODEV;
 712         }
 713         i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
 714         dev_dbg(&intf->dev, "set interface result %d\n", i);
 715
 716         interface = intf->cur_altsetting;
 717
 718         /*
 719          * Allocate parport interface
 720          */
 721         if (!(priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL))) {
 722                 usb_put_dev(usbdev);
 723                 return -ENOMEM;
 724         }
 725         priv->pp = NULL;
 726         priv->usbdev = usbdev;
 727         kref_init(&priv->ref_count);
 728         spin_lock_init(&priv->asynclock);
 729         INIT_LIST_HEAD(&priv->asynclist);
 730         if (!(pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops))) {
 731                 printk(KERN_WARNING "uss720: could not register parport\n");
 732                 goto probe_abort;
 733         }
 734
 735         priv->pp = pp;
 736         pp->private_data = priv;
 737         pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
 738
 739         /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
 740         set_1284_register(pp, 7, 0x00, GFP_KERNEL);
 741         set_1284_register(pp, 6, 0x30, GFP_KERNEL);  /* PS/2 mode */
 742         set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
 743         /* debugging */
 744         get_1284_register(pp, 0, &reg, GFP_KERNEL);
 745         dev_dbg(&intf->dev, "reg: %02x %02x %02x %02x %02x %02x %02x\n",
 746                 priv->reg[0], priv->reg[1], priv->reg[2], priv->reg[3],
 747                 priv->reg[4], priv->reg[5], priv->reg[6]);
 748
 749         endpoint = &interface->endpoint[2];
 750         dev_dbg(&intf->dev, "epaddr %d interval %d\n",
 751                 endpoint->desc.bEndpointAddress, endpoint->desc.bInterval);
 752         parport_announce_port(pp);
 753
 754         usb_set_intfdata(intf, pp);
 755         return 0;
 756
 757 probe_abort:
 758         kill_all_async_requests_priv(priv);
 759         kref_put(&priv->ref_count, destroy_priv);
 760         return -ENODEV;
 761 }
 762
 763 static void uss720_disconnect(struct usb_interface *intf)
 764 {
 765         struct parport *pp = usb_get_intfdata(intf);
 766         struct parport_uss720_private *priv;
 767         struct usb_device *usbdev;
 768
 769         dev_dbg(&intf->dev, "disconnect\n");
 770         usb_set_intfdata(intf, NULL);
 771         if (pp) {
 772                 priv = pp->private_data;
 773                 usbdev = priv->usbdev;
 774                 priv->usbdev = NULL;
 775                 priv->pp = NULL;
 776                 dev_dbg(&intf->dev, "parport_remove_port\n");
 777                 parport_remove_port(pp);
 778                 parport_put_port(pp);
 779                 kill_all_async_requests_priv(priv);
 780                 kref_put(&priv->ref_count, destroy_priv);
 781         }
 782         dev_dbg(&intf->dev, "disconnect done\n");
 783 }
 784
 785 /* table of cables that work through this driver */
 786 static const struct usb_device_id uss720_table[] = {
 787         { USB_DEVICE(0x047e, 0x1001) },
 788         { USB_DEVICE(0x0557, 0x2001) },
 789         { USB_DEVICE(0x0729, 0x1284) },
 790         { USB_DEVICE(0x1293, 0x0002) },
 791         { USB_DEVICE(0x050d, 0x0002) },
 792         { }                                             /* Terminating entry */
 793 };
 794
 795 MODULE_DEVICE_TABLE (usb, uss720_table);
 796
 797
 798 static struct usb_driver uss720_driver = {
 799         .name =         "uss720",
 800         .probe =        uss720_probe,
 801         .disconnect =   uss720_disconnect,
 802         .id_table =     uss720_table,
 803 };
 804
 805 /* --------------------------------------------------------------------- */
 806
 807 MODULE_AUTHOR(DRIVER_AUTHOR);
 808 MODULE_DESCRIPTION(DRIVER_DESC);
 809 MODULE_LICENSE("GPL");
 810
 811 static int __init uss720_init(void)
 812 {
 813         int retval;
 814         retval = usb_register(&uss720_driver);
 815         if (retval)
 816                 goto out;
 817
 818         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 819                DRIVER_DESC "\n");
 820         printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose "
 821                "driver to allow nonstandard\n");
 822         printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over "
 823                "USS720 usb to parallel cables\n");
 824         printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a "
 825                "printer, use usblp instead\n");
 826 out:
 827         return retval;
 828 }
 829
 830 static void __exit uss720_cleanup(void)
 831 {
 832         usb_deregister(&uss720_driver);
 833 }
 834
 835 module_init(uss720_init);
 836 module_exit(uss720_cleanup);
 837
 838 /* --------------------------------------------------------------------- */