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, "async_complete regs %7ph\n",
 128                         priv->reg);
 129 #endif
 130                 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
 131                 if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
 132                         parport_generic_irq(pp);
 133         }
 134         complete(&rq->compl);
 135         kref_put(&rq->ref_count, destroy_async);
 136 }
 137
 138 static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
 139                                                          __u8 request, __u8 requesttype, __u16 value, __u16 index,
 140                                                          gfp_t mem_flags)
 141 {
 142         struct usb_device *usbdev;
 143         struct uss720_async_request *rq;
 144         unsigned long flags;
 145         int ret;
 146
 147         if (!priv)
 148                 return NULL;
 149         usbdev = priv->usbdev;
 150         if (!usbdev)
 151                 return NULL;
 152         rq = kzalloc(sizeof(struct uss720_async_request), mem_flags);
 153         if (!rq)
 154                 return NULL;
 155         kref_init(&rq->ref_count);
 156         INIT_LIST_HEAD(&rq->asynclist);
 157         init_completion(&rq->compl);
 158         kref_get(&priv->ref_count);
 159         rq->priv = priv;
 160         rq->urb = usb_alloc_urb(0, mem_flags);
 161         if (!rq->urb) {
 162                 kref_put(&rq->ref_count, destroy_async);
 163                 return NULL;
 164         }
 165         rq->dr = kmalloc(sizeof(*rq->dr), mem_flags);
 166         if (!rq->dr) {
 167                 kref_put(&rq->ref_count, destroy_async);
 168                 return NULL;
 169         }
 170         rq->dr->bRequestType = requesttype;
 171         rq->dr->bRequest = request;
 172         rq->dr->wValue = cpu_to_le16(value);
 173         rq->dr->wIndex = cpu_to_le16(index);
 174         rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
 175         usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
 176                              (unsigned char *)rq->dr,
 177                              (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
 178         /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
 179         spin_lock_irqsave(&priv->asynclock, flags);
 180         list_add_tail(&rq->asynclist, &priv->asynclist);
 181         spin_unlock_irqrestore(&priv->asynclock, flags);
 182         kref_get(&rq->ref_count);
 183         ret = usb_submit_urb(rq->urb, mem_flags);
 184         if (!ret)
 185                 return rq;
 186         destroy_async(&rq->ref_count);
 187         dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
 188         return NULL;
 189 }
 190
 191 static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
 192 {
 193         struct uss720_async_request *rq;
 194         unsigned long flags;
 195         unsigned int ret = 0;
 196
 197         spin_lock_irqsave(&priv->asynclock, flags);
 198         list_for_each_entry(rq, &priv->asynclist, asynclist) {
 199                 usb_unlink_urb(rq->urb);
 200                 ret++;
 201         }
 202         spin_unlock_irqrestore(&priv->asynclock, flags);
 203         return ret;
 204 }
 205
 206 /* --------------------------------------------------------------------- */
 207
 208 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
 209 {
 210         struct parport_uss720_private *priv;
 211         struct uss720_async_request *rq;
 212         static const unsigned char regindex[9] = {
 213                 4, 0, 1, 5, 5, 0, 2, 3, 6
 214         };
 215         int ret;
 216
 217         if (!pp)
 218                 return -EIO;
 219         priv = pp->private_data;
 220         rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
 221         if (!rq) {
 222                 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
 223                         (unsigned int)reg);
 224                 return -EIO;
 225         }
 226         if (!val) {
 227                 kref_put(&rq->ref_count, destroy_async);
 228                 return 0;
 229         }
 230         if (wait_for_completion_timeout(&rq->compl, HZ)) {
 231                 ret = rq->urb->status;
 232                 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
 233                 if (ret)
 234                         printk(KERN_WARNING "get_1284_register: "
 235                                "usb error %d\n", ret);
 236                 kref_put(&rq->ref_count, destroy_async);
 237                 return ret;
 238         }
 239         printk(KERN_WARNING "get_1284_register timeout\n");
 240         kill_all_async_requests_priv(priv);
 241         return -EIO;
 242 }
 243
 244 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
 245 {
 246         struct parport_uss720_private *priv;
 247         struct uss720_async_request *rq;
 248
 249         if (!pp)
 250                 return -EIO;
 251         priv = pp->private_data;
 252         rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
 253         if (!rq) {
 254                 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
 255                         (unsigned int)reg, (unsigned int)val);
 256                 return -EIO;
 257         }
 258         kref_put(&rq->ref_count, destroy_async);
 259         return 0;
 260 }
 261
 262 /* --------------------------------------------------------------------- */
 263
 264 /* ECR modes */
 265 #define ECR_SPP 00
 266 #define ECR_PS2 01
 267 #define ECR_PPF 02
 268 #define ECR_ECP 03
 269 #define ECR_EPP 04
 270
 271 /* Safely change the mode bits in the ECR */
 272 static int change_mode(struct parport *pp, int m)
 273 {
 274         struct parport_uss720_private *priv = pp->private_data;
 275         int mode;
 276         __u8 reg;
 277
 278         if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 279                 return -EIO;
 280         /* Bits <7:5> contain the mode. */
 281         mode = (priv->reg[2] >> 5) & 0x7;
 282         if (mode == m)
 283                 return 0;
 284         /* We have to go through mode 000 or 001 */
 285         if (mode > ECR_PS2 && m > ECR_PS2)
 286                 if (change_mode(pp, ECR_PS2))
 287                         return -EIO;
 288
 289         if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
 290                 /* This mode resets the FIFO, so we may
 291                  * have to wait for it to drain first. */
 292                 unsigned long expire = jiffies + pp->physport->cad->timeout;
 293                 switch (mode) {
 294                 case ECR_PPF: /* Parallel Port FIFO mode */
 295                 case ECR_ECP: /* ECP Parallel Port mode */
 296                         /* Poll slowly. */
 297                         for (;;) {
 298                                 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 299                                         return -EIO;
 300                                 if (priv->reg[2] & 0x01)
 301                                         break;
 302                                 if (time_after_eq (jiffies, expire))
 303                                         /* The FIFO is stuck. */
 304                                         return -EBUSY;
 305                                 msleep_interruptible(10);
 306                                 if (signal_pending (current))
 307                                         break;
 308                         }
 309                 }
 310         }
 311         /* Set the mode. */
 312         if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
 313                 return -EIO;
 314         if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 315                 return -EIO;
 316         return 0;
 317 }
 318
 319 /*
 320  * Clear TIMEOUT BIT in EPP MODE
 321  */
 322 static int clear_epp_timeout(struct parport *pp)
 323 {
 324         unsigned char stat;
 325
 326         if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
 327                 return 1;
 328         return stat & 1;
 329 }
 330
 331 /*
 332  * Access functions.
 333  */
 334 #if 0
 335 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
 336 {
 337         struct parport *pp = (struct parport *)dev_id;
 338         struct parport_uss720_private *priv = pp->private_data;
 339
 340         if (usbstatus != 0 || len < 4 || !buffer)
 341                 return 1;
 342         memcpy(priv->reg, buffer, 4);
 343         /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
 344         if (priv->reg[2] & priv->reg[1] & 0x10)
 345                 parport_generic_irq(pp);
 346         return 1;
 347 }
 348 #endif
 349
 350 static void parport_uss720_write_data(struct parport *pp, unsigned char d)
 351 {
 352         set_1284_register(pp, 0, d, GFP_KERNEL);
 353 }
 354
 355 static unsigned char parport_uss720_read_data(struct parport *pp)
 356 {
 357         unsigned char ret;
 358
 359         if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
 360                 return 0;
 361         return ret;
 362 }
 363
 364 static void parport_uss720_write_control(struct parport *pp, unsigned char d)
 365 {
 366         struct parport_uss720_private *priv = pp->private_data;
 367
 368         d = (d & 0xf) | (priv->reg[1] & 0xf0);
 369         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 370                 return;
 371         priv->reg[1] = d;
 372 }
 373
 374 static unsigned char parport_uss720_read_control(struct parport *pp)
 375 {
 376         struct parport_uss720_private *priv = pp->private_data;
 377         return priv->reg[1] & 0xf; /* Use soft copy */
 378 }
 379
 380 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
 381 {
 382         struct parport_uss720_private *priv = pp->private_data;
 383         unsigned char d;
 384
 385         mask &= 0x0f;
 386         val &= 0x0f;
 387         d = (priv->reg[1] & (~mask)) ^ val;
 388         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 389                 return 0;
 390         priv->reg[1] = d;
 391         return d & 0xf;
 392 }
 393
 394 static unsigned char parport_uss720_read_status(struct parport *pp)
 395 {
 396         unsigned char ret;
 397
 398         if (get_1284_register(pp, 1, &ret, GFP_KERNEL))
 399                 return 0;
 400         return ret & 0xf8;
 401 }
 402
 403 static void parport_uss720_disable_irq(struct parport *pp)
 404 {
 405         struct parport_uss720_private *priv = pp->private_data;
 406         unsigned char d;
 407
 408         d = priv->reg[1] & ~0x10;
 409         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 410                 return;
 411         priv->reg[1] = d;
 412 }
 413
 414 static void parport_uss720_enable_irq(struct parport *pp)
 415 {
 416         struct parport_uss720_private *priv = pp->private_data;
 417         unsigned char d;
 418
 419         d = priv->reg[1] | 0x10;
 420         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 421                 return;
 422         priv->reg[1] = d;
 423 }
 424
 425 static void parport_uss720_data_forward (struct parport *pp)
 426 {
 427         struct parport_uss720_private *priv = pp->private_data;
 428         unsigned char d;
 429
 430         d = priv->reg[1] & ~0x20;
 431         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 432                 return;
 433         priv->reg[1] = d;
 434 }
 435
 436 static void parport_uss720_data_reverse (struct parport *pp)
 437 {
 438         struct parport_uss720_private *priv = pp->private_data;
 439         unsigned char d;
 440
 441         d = priv->reg[1] | 0x20;
 442         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 443                 return;
 444         priv->reg[1] = d;
 445 }
 446
 447 static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
 448 {
 449         s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
 450         s->u.pc.ecr = 0x24;
 451 }
 452
 453 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
 454 {
 455         struct parport_uss720_private *priv = pp->private_data;
 456
 457 #if 0
 458         if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
 459                 return;
 460 #endif
 461         s->u.pc.ctr = priv->reg[1];
 462         s->u.pc.ecr = priv->reg[2];
 463 }
 464
 465 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
 466 {
 467         struct parport_uss720_private *priv = pp->private_data;
 468
 469         set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
 470         set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
 471         get_1284_register(pp, 2, NULL, GFP_ATOMIC);
 472         priv->reg[1] = s->u.pc.ctr;
 473         priv->reg[2] = s->u.pc.ecr;
 474 }
 475
 476 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
 477 {
 478         struct parport_uss720_private *priv = pp->private_data;
 479         size_t got = 0;
 480
 481         if (change_mode(pp, ECR_EPP))
 482                 return 0;
 483         for (; got < length; got++) {
 484                 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
 485                         break;
 486                 buf++;
 487                 if (priv->reg[0] & 0x01) {
 488                         clear_epp_timeout(pp);
 489                         break;
 490                 }
 491         }
 492         change_mode(pp, ECR_PS2);
 493         return got;
 494 }
 495
 496 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
 497 {
 498 #if 0
 499         struct parport_uss720_private *priv = pp->private_data;
 500         size_t written = 0;
 501
 502         if (change_mode(pp, ECR_EPP))
 503                 return 0;
 504         for (; written < length; written++) {
 505                 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
 506                         break;
 507                 ((char*)buf)++;
 508                 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
 509                         break;
 510                 if (priv->reg[0] & 0x01) {
 511                         clear_epp_timeout(pp);
 512                         break;
 513                 }
 514         }
 515         change_mode(pp, ECR_PS2);
 516         return written;
 517 #else
 518         struct parport_uss720_private *priv = pp->private_data;
 519         struct usb_device *usbdev = priv->usbdev;
 520         int rlen;
 521         int i;
 522
 523         if (!usbdev)
 524                 return 0;
 525         if (change_mode(pp, ECR_EPP))
 526                 return 0;
 527         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
 528         if (i)
 529                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buf, length, rlen);
 530         change_mode(pp, ECR_PS2);
 531         return rlen;
 532 #endif
 533 }
 534
 535 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
 536 {
 537         struct parport_uss720_private *priv = pp->private_data;
 538         size_t got = 0;
 539
 540         if (change_mode(pp, ECR_EPP))
 541                 return 0;
 542         for (; got < length; got++) {
 543                 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
 544                         break;
 545                 buf++;
 546                 if (priv->reg[0] & 0x01) {
 547                         clear_epp_timeout(pp);
 548                         break;
 549                 }
 550         }
 551         change_mode(pp, ECR_PS2);
 552         return got;
 553 }
 554
 555 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
 556 {
 557         struct parport_uss720_private *priv = pp->private_data;
 558         size_t written = 0;
 559
 560         if (change_mode(pp, ECR_EPP))
 561                 return 0;
 562         for (; written < length; written++) {
 563                 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
 564                         break;
 565                 buf++;
 566                 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
 567                         break;
 568                 if (priv->reg[0] & 0x01) {
 569                         clear_epp_timeout(pp);
 570                         break;
 571                 }
 572         }
 573         change_mode(pp, ECR_PS2);
 574         return written;
 575 }
 576
 577 static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
 578 {
 579         struct parport_uss720_private *priv = pp->private_data;
 580         struct usb_device *usbdev = priv->usbdev;
 581         int rlen;
 582         int i;
 583
 584         if (!usbdev)
 585                 return 0;
 586         if (change_mode(pp, ECR_ECP))
 587                 return 0;
 588         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
 589         if (i)
 590                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
 591         change_mode(pp, ECR_PS2);
 592         return rlen;
 593 }
 594
 595 static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
 596 {
 597         struct parport_uss720_private *priv = pp->private_data;
 598         struct usb_device *usbdev = priv->usbdev;
 599         int rlen;
 600         int i;
 601
 602         if (!usbdev)
 603                 return 0;
 604         if (change_mode(pp, ECR_ECP))
 605                 return 0;
 606         i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
 607         if (i)
 608                 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %Zu rlen %u\n", buffer, len, rlen);
 609         change_mode(pp, ECR_PS2);
 610         return rlen;
 611 }
 612
 613 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
 614 {
 615         size_t written = 0;
 616
 617         if (change_mode(pp, ECR_ECP))
 618                 return 0;
 619         for (; written < len; written++) {
 620                 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
 621                         break;
 622                 buffer++;
 623         }
 624         change_mode(pp, ECR_PS2);
 625         return written;
 626 }
 627
 628 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
 629 {
 630         struct parport_uss720_private *priv = pp->private_data;
 631         struct usb_device *usbdev = priv->usbdev;
 632         int rlen;
 633         int i;
 634
 635         if (!usbdev)
 636                 return 0;
 637         if (change_mode(pp, ECR_PPF))
 638                 return 0;
 639         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
 640         if (i)
 641                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
 642         change_mode(pp, ECR_PS2);
 643         return rlen;
 644 }
 645
 646 /* --------------------------------------------------------------------- */
 647
 648 static struct parport_operations parport_uss720_ops =
 649 {
 650         .owner =                THIS_MODULE,
 651         .write_data =           parport_uss720_write_data,
 652         .read_data =            parport_uss720_read_data,
 653
 654         .write_control =        parport_uss720_write_control,
 655         .read_control =         parport_uss720_read_control,
 656         .frob_control =         parport_uss720_frob_control,
 657
 658         .read_status =          parport_uss720_read_status,
 659
 660         .enable_irq =           parport_uss720_enable_irq,
 661         .disable_irq =          parport_uss720_disable_irq,
 662
 663         .data_forward =         parport_uss720_data_forward,
 664         .data_reverse =         parport_uss720_data_reverse,
 665
 666         .init_state =           parport_uss720_init_state,
 667         .save_state =           parport_uss720_save_state,
 668         .restore_state =        parport_uss720_restore_state,
 669
 670         .epp_write_data =       parport_uss720_epp_write_data,
 671         .epp_read_data =        parport_uss720_epp_read_data,
 672         .epp_write_addr =       parport_uss720_epp_write_addr,
 673         .epp_read_addr =        parport_uss720_epp_read_addr,
 674
 675         .ecp_write_data =       parport_uss720_ecp_write_data,
 676         .ecp_read_data =        parport_uss720_ecp_read_data,
 677         .ecp_write_addr =       parport_uss720_ecp_write_addr,
 678
 679         .compat_write_data =    parport_uss720_write_compat,
 680         .nibble_read_data =     parport_ieee1284_read_nibble,
 681         .byte_read_data =       parport_ieee1284_read_byte,
 682 };
 683
 684 /* --------------------------------------------------------------------- */
 685
 686 static int uss720_probe(struct usb_interface *intf,
 687                         const struct usb_device_id *id)
 688 {
 689         struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
 690         struct usb_host_interface *interface;
 691         struct usb_host_endpoint *endpoint;
 692         struct parport_uss720_private *priv;
 693         struct parport *pp;
 694         unsigned char reg;
 695         int i;
 696
 697         dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n",
 698                 le16_to_cpu(usbdev->descriptor.idVendor),
 699                 le16_to_cpu(usbdev->descriptor.idProduct));
 700
 701         /* our known interfaces have 3 alternate settings */
 702         if (intf->num_altsetting != 3) {
 703                 usb_put_dev(usbdev);
 704                 return -ENODEV;
 705         }
 706         i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
 707         dev_dbg(&intf->dev, "set interface result %d\n", i);
 708
 709         interface = intf->cur_altsetting;
 710
 711         /*
 712          * Allocate parport interface
 713          */
 714         priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL);
 715         if (!priv) {
 716                 usb_put_dev(usbdev);
 717                 return -ENOMEM;
 718         }
 719         priv->pp = NULL;
 720         priv->usbdev = usbdev;
 721         kref_init(&priv->ref_count);
 722         spin_lock_init(&priv->asynclock);
 723         INIT_LIST_HEAD(&priv->asynclist);
 724         pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops);
 725         if (!pp) {
 726                 printk(KERN_WARNING "uss720: could not register parport\n");
 727                 goto probe_abort;
 728         }
 729
 730         priv->pp = pp;
 731         pp->private_data = priv;
 732         pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
 733
 734         /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
 735         set_1284_register(pp, 7, 0x00, GFP_KERNEL);
 736         set_1284_register(pp, 6, 0x30, GFP_KERNEL);  /* PS/2 mode */
 737         set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
 738         /* debugging */
 739         get_1284_register(pp, 0, &reg, GFP_KERNEL);
 740         dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg);
 741
 742         endpoint = &interface->endpoint[2];
 743         dev_dbg(&intf->dev, "epaddr %d interval %d\n",
 744                 endpoint->desc.bEndpointAddress, endpoint->desc.bInterval);
 745         parport_announce_port(pp);
 746
 747         usb_set_intfdata(intf, pp);
 748         return 0;
 749
 750 probe_abort:
 751         kill_all_async_requests_priv(priv);
 752         kref_put(&priv->ref_count, destroy_priv);
 753         return -ENODEV;
 754 }
 755
 756 static void uss720_disconnect(struct usb_interface *intf)
 757 {
 758         struct parport *pp = usb_get_intfdata(intf);
 759         struct parport_uss720_private *priv;
 760         struct usb_device *usbdev;
 761
 762         dev_dbg(&intf->dev, "disconnect\n");
 763         usb_set_intfdata(intf, NULL);
 764         if (pp) {
 765                 priv = pp->private_data;
 766                 usbdev = priv->usbdev;
 767                 priv->usbdev = NULL;
 768                 priv->pp = NULL;
 769                 dev_dbg(&intf->dev, "parport_remove_port\n");
 770                 parport_remove_port(pp);
 771                 parport_put_port(pp);
 772                 kill_all_async_requests_priv(priv);
 773                 kref_put(&priv->ref_count, destroy_priv);
 774         }
 775         dev_dbg(&intf->dev, "disconnect done\n");
 776 }
 777
 778 /* table of cables that work through this driver */
 779 static const struct usb_device_id uss720_table[] = {
 780         { USB_DEVICE(0x047e, 0x1001) },
 781         { USB_DEVICE(0x0557, 0x2001) },
 782         { USB_DEVICE(0x0729, 0x1284) },
 783         { USB_DEVICE(0x1293, 0x0002) },
 784         { USB_DEVICE(0x050d, 0x0002) },
 785         { }                                             /* Terminating entry */
 786 };
 787
 788 MODULE_DEVICE_TABLE (usb, uss720_table);
 789
 790
 791 static struct usb_driver uss720_driver = {
 792         .name =         "uss720",
 793         .probe =        uss720_probe,
 794         .disconnect =   uss720_disconnect,
 795         .id_table =     uss720_table,
 796 };
 797
 798 /* --------------------------------------------------------------------- */
 799
 800 MODULE_AUTHOR(DRIVER_AUTHOR);
 801 MODULE_DESCRIPTION(DRIVER_DESC);
 802 MODULE_LICENSE("GPL");
 803
 804 static int __init uss720_init(void)
 805 {
 806         int retval;
 807         retval = usb_register(&uss720_driver);
 808         if (retval)
 809                 goto out;
 810
 811         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 812                DRIVER_DESC "\n");
 813         printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose "
 814                "driver to allow nonstandard\n");
 815         printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over "
 816                "USS720 usb to parallel cables\n");
 817         printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a "
 818                "printer, use usblp instead\n");
 819 out:
 820         return retval;
 821 }
 822
 823 static void __exit uss720_cleanup(void)
 824 {
 825         usb_deregister(&uss720_driver);
 826 }
 827
 828 module_init(uss720_init);
 829 module_exit(uss720_cleanup);
 830
 831 /* --------------------------------------------------------------------- */