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                 dev_err(&usbdev->dev, "submit_async_request out of memory\n");
 155                 return NULL;
 156         }
 157         kref_init(&rq->ref_count);
 158         INIT_LIST_HEAD(&rq->asynclist);
 159         init_completion(&rq->compl);
 160         kref_get(&priv->ref_count);
 161         rq->priv = priv;
 162         rq->urb = usb_alloc_urb(0, mem_flags);
 163         if (!rq->urb) {
 164                 kref_put(&rq->ref_count, destroy_async);
 165                 dev_err(&usbdev->dev, "submit_async_request out of memory\n");
 166                 return NULL;
 167         }
 168         rq->dr = kmalloc(sizeof(*rq->dr), mem_flags);
 169         if (!rq->dr) {
 170                 kref_put(&rq->ref_count, destroy_async);
 171                 return NULL;
 172         }
 173         rq->dr->bRequestType = requesttype;
 174         rq->dr->bRequest = request;
 175         rq->dr->wValue = cpu_to_le16(value);
 176         rq->dr->wIndex = cpu_to_le16(index);
 177         rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
 178         usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
 179                              (unsigned char *)rq->dr,
 180                              (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
 181         /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
 182         spin_lock_irqsave(&priv->asynclock, flags);
 183         list_add_tail(&rq->asynclist, &priv->asynclist);
 184         spin_unlock_irqrestore(&priv->asynclock, flags);
 185         kref_get(&rq->ref_count);
 186         ret = usb_submit_urb(rq->urb, mem_flags);
 187         if (!ret)
 188                 return rq;
 189         destroy_async(&rq->ref_count);
 190         dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
 191         return NULL;
 192 }
 193
 194 static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
 195 {
 196         struct uss720_async_request *rq;
 197         unsigned long flags;
 198         unsigned int ret = 0;
 199
 200         spin_lock_irqsave(&priv->asynclock, flags);
 201         list_for_each_entry(rq, &priv->asynclist, asynclist) {
 202                 usb_unlink_urb(rq->urb);
 203                 ret++;
 204         }
 205         spin_unlock_irqrestore(&priv->asynclock, flags);
 206         return ret;
 207 }
 208
 209 /* --------------------------------------------------------------------- */
 210
 211 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
 212 {
 213         struct parport_uss720_private *priv;
 214         struct uss720_async_request *rq;
 215         static const unsigned char regindex[9] = {
 216                 4, 0, 1, 5, 5, 0, 2, 3, 6
 217         };
 218         int ret;
 219
 220         if (!pp)
 221                 return -EIO;
 222         priv = pp->private_data;
 223         rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
 224         if (!rq) {
 225                 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
 226                         (unsigned int)reg);
 227                 return -EIO;
 228         }
 229         if (!val) {
 230                 kref_put(&rq->ref_count, destroy_async);
 231                 return 0;
 232         }
 233         if (wait_for_completion_timeout(&rq->compl, HZ)) {
 234                 ret = rq->urb->status;
 235                 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
 236                 if (ret)
 237                         printk(KERN_WARNING "get_1284_register: "
 238                                "usb error %d\n", ret);
 239                 kref_put(&rq->ref_count, destroy_async);
 240                 return ret;
 241         }
 242         printk(KERN_WARNING "get_1284_register timeout\n");
 243         kill_all_async_requests_priv(priv);
 244         return -EIO;
 245 }
 246
 247 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
 248 {
 249         struct parport_uss720_private *priv;
 250         struct uss720_async_request *rq;
 251
 252         if (!pp)
 253                 return -EIO;
 254         priv = pp->private_data;
 255         rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
 256         if (!rq) {
 257                 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
 258                         (unsigned int)reg, (unsigned int)val);
 259                 return -EIO;
 260         }
 261         kref_put(&rq->ref_count, destroy_async);
 262         return 0;
 263 }
 264
 265 /* --------------------------------------------------------------------- */
 266
 267 /* ECR modes */
 268 #define ECR_SPP 00
 269 #define ECR_PS2 01
 270 #define ECR_PPF 02
 271 #define ECR_ECP 03
 272 #define ECR_EPP 04
 273
 274 /* Safely change the mode bits in the ECR */
 275 static int change_mode(struct parport *pp, int m)
 276 {
 277         struct parport_uss720_private *priv = pp->private_data;
 278         int mode;
 279         __u8 reg;
 280
 281         if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 282                 return -EIO;
 283         /* Bits <7:5> contain the mode. */
 284         mode = (priv->reg[2] >> 5) & 0x7;
 285         if (mode == m)
 286                 return 0;
 287         /* We have to go through mode 000 or 001 */
 288         if (mode > ECR_PS2 && m > ECR_PS2)
 289                 if (change_mode(pp, ECR_PS2))
 290                         return -EIO;
 291
 292         if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
 293                 /* This mode resets the FIFO, so we may
 294                  * have to wait for it to drain first. */
 295                 unsigned long expire = jiffies + pp->physport->cad->timeout;
 296                 switch (mode) {
 297                 case ECR_PPF: /* Parallel Port FIFO mode */
 298                 case ECR_ECP: /* ECP Parallel Port mode */
 299                         /* Poll slowly. */
 300                         for (;;) {
 301                                 if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 302                                         return -EIO;
 303                                 if (priv->reg[2] & 0x01)
 304                                         break;
 305                                 if (time_after_eq (jiffies, expire))
 306                                         /* The FIFO is stuck. */
 307                                         return -EBUSY;
 308                                 msleep_interruptible(10);
 309                                 if (signal_pending (current))
 310                                         break;
 311                         }
 312                 }
 313         }
 314         /* Set the mode. */
 315         if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
 316                 return -EIO;
 317         if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
 318                 return -EIO;
 319         return 0;
 320 }
 321
 322 /*
 323  * Clear TIMEOUT BIT in EPP MODE
 324  */
 325 static int clear_epp_timeout(struct parport *pp)
 326 {
 327         unsigned char stat;
 328
 329         if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
 330                 return 1;
 331         return stat & 1;
 332 }
 333
 334 /*
 335  * Access functions.
 336  */
 337 #if 0
 338 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
 339 {
 340         struct parport *pp = (struct parport *)dev_id;
 341         struct parport_uss720_private *priv = pp->private_data;
 342
 343         if (usbstatus != 0 || len < 4 || !buffer)
 344                 return 1;
 345         memcpy(priv->reg, buffer, 4);
 346         /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
 347         if (priv->reg[2] & priv->reg[1] & 0x10)
 348                 parport_generic_irq(pp);
 349         return 1;
 350 }
 351 #endif
 352
 353 static void parport_uss720_write_data(struct parport *pp, unsigned char d)
 354 {
 355         set_1284_register(pp, 0, d, GFP_KERNEL);
 356 }
 357
 358 static unsigned char parport_uss720_read_data(struct parport *pp)
 359 {
 360         unsigned char ret;
 361
 362         if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
 363                 return 0;
 364         return ret;
 365 }
 366
 367 static void parport_uss720_write_control(struct parport *pp, unsigned char d)
 368 {
 369         struct parport_uss720_private *priv = pp->private_data;
 370
 371         d = (d & 0xf) | (priv->reg[1] & 0xf0);
 372         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 373                 return;
 374         priv->reg[1] = d;
 375 }
 376
 377 static unsigned char parport_uss720_read_control(struct parport *pp)
 378 {
 379         struct parport_uss720_private *priv = pp->private_data;
 380         return priv->reg[1] & 0xf; /* Use soft copy */
 381 }
 382
 383 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
 384 {
 385         struct parport_uss720_private *priv = pp->private_data;
 386         unsigned char d;
 387
 388         mask &= 0x0f;
 389         val &= 0x0f;
 390         d = (priv->reg[1] & (~mask)) ^ val;
 391         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 392                 return 0;
 393         priv->reg[1] = d;
 394         return d & 0xf;
 395 }
 396
 397 static unsigned char parport_uss720_read_status(struct parport *pp)
 398 {
 399         unsigned char ret;
 400
 401         if (get_1284_register(pp, 1, &ret, GFP_KERNEL))
 402                 return 0;
 403         return ret & 0xf8;
 404 }
 405
 406 static void parport_uss720_disable_irq(struct parport *pp)
 407 {
 408         struct parport_uss720_private *priv = pp->private_data;
 409         unsigned char d;
 410
 411         d = priv->reg[1] & ~0x10;
 412         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 413                 return;
 414         priv->reg[1] = d;
 415 }
 416
 417 static void parport_uss720_enable_irq(struct parport *pp)
 418 {
 419         struct parport_uss720_private *priv = pp->private_data;
 420         unsigned char d;
 421
 422         d = priv->reg[1] | 0x10;
 423         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 424                 return;
 425         priv->reg[1] = d;
 426 }
 427
 428 static void parport_uss720_data_forward (struct parport *pp)
 429 {
 430         struct parport_uss720_private *priv = pp->private_data;
 431         unsigned char d;
 432
 433         d = priv->reg[1] & ~0x20;
 434         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 435                 return;
 436         priv->reg[1] = d;
 437 }
 438
 439 static void parport_uss720_data_reverse (struct parport *pp)
 440 {
 441         struct parport_uss720_private *priv = pp->private_data;
 442         unsigned char d;
 443
 444         d = priv->reg[1] | 0x20;
 445         if (set_1284_register(pp, 2, d, GFP_KERNEL))
 446                 return;
 447         priv->reg[1] = d;
 448 }
 449
 450 static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
 451 {
 452         s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
 453         s->u.pc.ecr = 0x24;
 454 }
 455
 456 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
 457 {
 458         struct parport_uss720_private *priv = pp->private_data;
 459
 460 #if 0
 461         if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
 462                 return;
 463 #endif
 464         s->u.pc.ctr = priv->reg[1];
 465         s->u.pc.ecr = priv->reg[2];
 466 }
 467
 468 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
 469 {
 470         struct parport_uss720_private *priv = pp->private_data;
 471
 472         set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
 473         set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
 474         get_1284_register(pp, 2, NULL, GFP_ATOMIC);
 475         priv->reg[1] = s->u.pc.ctr;
 476         priv->reg[2] = s->u.pc.ecr;
 477 }
 478
 479 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
 480 {
 481         struct parport_uss720_private *priv = pp->private_data;
 482         size_t got = 0;
 483
 484         if (change_mode(pp, ECR_EPP))
 485                 return 0;
 486         for (; got < length; got++) {
 487                 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
 488                         break;
 489                 buf++;
 490                 if (priv->reg[0] & 0x01) {
 491                         clear_epp_timeout(pp);
 492                         break;
 493                 }
 494         }
 495         change_mode(pp, ECR_PS2);
 496         return got;
 497 }
 498
 499 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
 500 {
 501 #if 0
 502         struct parport_uss720_private *priv = pp->private_data;
 503         size_t written = 0;
 504
 505         if (change_mode(pp, ECR_EPP))
 506                 return 0;
 507         for (; written < length; written++) {
 508                 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
 509                         break;
 510                 ((char*)buf)++;
 511                 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
 512                         break;
 513                 if (priv->reg[0] & 0x01) {
 514                         clear_epp_timeout(pp);
 515                         break;
 516                 }
 517         }
 518         change_mode(pp, ECR_PS2);
 519         return written;
 520 #else
 521         struct parport_uss720_private *priv = pp->private_data;
 522         struct usb_device *usbdev = priv->usbdev;
 523         int rlen;
 524         int i;
 525
 526         if (!usbdev)
 527                 return 0;
 528         if (change_mode(pp, ECR_EPP))
 529                 return 0;
 530         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
 531         if (i)
 532                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buf, length, rlen);
 533         change_mode(pp, ECR_PS2);
 534         return rlen;
 535 #endif
 536 }
 537
 538 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
 539 {
 540         struct parport_uss720_private *priv = pp->private_data;
 541         size_t got = 0;
 542
 543         if (change_mode(pp, ECR_EPP))
 544                 return 0;
 545         for (; got < length; got++) {
 546                 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
 547                         break;
 548                 buf++;
 549                 if (priv->reg[0] & 0x01) {
 550                         clear_epp_timeout(pp);
 551                         break;
 552                 }
 553         }
 554         change_mode(pp, ECR_PS2);
 555         return got;
 556 }
 557
 558 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
 559 {
 560         struct parport_uss720_private *priv = pp->private_data;
 561         size_t written = 0;
 562
 563         if (change_mode(pp, ECR_EPP))
 564                 return 0;
 565         for (; written < length; written++) {
 566                 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
 567                         break;
 568                 buf++;
 569                 if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
 570                         break;
 571                 if (priv->reg[0] & 0x01) {
 572                         clear_epp_timeout(pp);
 573                         break;
 574                 }
 575         }
 576         change_mode(pp, ECR_PS2);
 577         return written;
 578 }
 579
 580 static size_t parport_uss720_ecp_write_data(struct parport *pp, const 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_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
 592         if (i)
 593                 printk(KERN_ERR "uss720: sendbulk ep 1 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_read_data(struct parport *pp, void *buffer, size_t len, int flags)
 599 {
 600         struct parport_uss720_private *priv = pp->private_data;
 601         struct usb_device *usbdev = priv->usbdev;
 602         int rlen;
 603         int i;
 604
 605         if (!usbdev)
 606                 return 0;
 607         if (change_mode(pp, ECR_ECP))
 608                 return 0;
 609         i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
 610         if (i)
 611                 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %Zu rlen %u\n", buffer, len, rlen);
 612         change_mode(pp, ECR_PS2);
 613         return rlen;
 614 }
 615
 616 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
 617 {
 618         size_t written = 0;
 619
 620         if (change_mode(pp, ECR_ECP))
 621                 return 0;
 622         for (; written < len; written++) {
 623                 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
 624                         break;
 625                 buffer++;
 626         }
 627         change_mode(pp, ECR_PS2);
 628         return written;
 629 }
 630
 631 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
 632 {
 633         struct parport_uss720_private *priv = pp->private_data;
 634         struct usb_device *usbdev = priv->usbdev;
 635         int rlen;
 636         int i;
 637
 638         if (!usbdev)
 639                 return 0;
 640         if (change_mode(pp, ECR_PPF))
 641                 return 0;
 642         i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
 643         if (i)
 644                 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
 645         change_mode(pp, ECR_PS2);
 646         return rlen;
 647 }
 648
 649 /* --------------------------------------------------------------------- */
 650
 651 static struct parport_operations parport_uss720_ops =
 652 {
 653         .owner =                THIS_MODULE,
 654         .write_data =           parport_uss720_write_data,
 655         .read_data =            parport_uss720_read_data,
 656
 657         .write_control =        parport_uss720_write_control,
 658         .read_control =         parport_uss720_read_control,
 659         .frob_control =         parport_uss720_frob_control,
 660
 661         .read_status =          parport_uss720_read_status,
 662
 663         .enable_irq =           parport_uss720_enable_irq,
 664         .disable_irq =          parport_uss720_disable_irq,
 665
 666         .data_forward =         parport_uss720_data_forward,
 667         .data_reverse =         parport_uss720_data_reverse,
 668
 669         .init_state =           parport_uss720_init_state,
 670         .save_state =           parport_uss720_save_state,
 671         .restore_state =        parport_uss720_restore_state,
 672
 673         .epp_write_data =       parport_uss720_epp_write_data,
 674         .epp_read_data =        parport_uss720_epp_read_data,
 675         .epp_write_addr =       parport_uss720_epp_write_addr,
 676         .epp_read_addr =        parport_uss720_epp_read_addr,
 677
 678         .ecp_write_data =       parport_uss720_ecp_write_data,
 679         .ecp_read_data =        parport_uss720_ecp_read_data,
 680         .ecp_write_addr =       parport_uss720_ecp_write_addr,
 681
 682         .compat_write_data =    parport_uss720_write_compat,
 683         .nibble_read_data =     parport_ieee1284_read_nibble,
 684         .byte_read_data =       parport_ieee1284_read_byte,
 685 };
 686
 687 /* --------------------------------------------------------------------- */
 688
 689 static int uss720_probe(struct usb_interface *intf,
 690                         const struct usb_device_id *id)
 691 {
 692         struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
 693         struct usb_host_interface *interface;
 694         struct usb_host_endpoint *endpoint;
 695         struct parport_uss720_private *priv;
 696         struct parport *pp;
 697         unsigned char reg;
 698         int i;
 699
 700         dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n",
 701                 le16_to_cpu(usbdev->descriptor.idVendor),
 702                 le16_to_cpu(usbdev->descriptor.idProduct));
 703
 704         /* our known interfaces have 3 alternate settings */
 705         if (intf->num_altsetting != 3) {
 706                 usb_put_dev(usbdev);
 707                 return -ENODEV;
 708         }
 709         i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
 710         dev_dbg(&intf->dev, "set interface result %d\n", i);
 711
 712         interface = intf->cur_altsetting;
 713
 714         /*
 715          * Allocate parport interface
 716          */
 717         priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL);
 718         if (!priv) {
 719                 usb_put_dev(usbdev);
 720                 return -ENOMEM;
 721         }
 722         priv->pp = NULL;
 723         priv->usbdev = usbdev;
 724         kref_init(&priv->ref_count);
 725         spin_lock_init(&priv->asynclock);
 726         INIT_LIST_HEAD(&priv->asynclist);
 727         pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops);
 728         if (!pp) {
 729                 printk(KERN_WARNING "uss720: could not register parport\n");
 730                 goto probe_abort;
 731         }
 732
 733         priv->pp = pp;
 734         pp->private_data = priv;
 735         pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
 736
 737         /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
 738         set_1284_register(pp, 7, 0x00, GFP_KERNEL);
 739         set_1284_register(pp, 6, 0x30, GFP_KERNEL);  /* PS/2 mode */
 740         set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
 741         /* debugging */
 742         get_1284_register(pp, 0, &reg, GFP_KERNEL);
 743         dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg);
 744
 745         endpoint = &interface->endpoint[2];
 746         dev_dbg(&intf->dev, "epaddr %d interval %d\n",
 747                 endpoint->desc.bEndpointAddress, endpoint->desc.bInterval);
 748         parport_announce_port(pp);
 749
 750         usb_set_intfdata(intf, pp);
 751         return 0;
 752
 753 probe_abort:
 754         kill_all_async_requests_priv(priv);
 755         kref_put(&priv->ref_count, destroy_priv);
 756         return -ENODEV;
 757 }
 758
 759 static void uss720_disconnect(struct usb_interface *intf)
 760 {
 761         struct parport *pp = usb_get_intfdata(intf);
 762         struct parport_uss720_private *priv;
 763         struct usb_device *usbdev;
 764
 765         dev_dbg(&intf->dev, "disconnect\n");
 766         usb_set_intfdata(intf, NULL);
 767         if (pp) {
 768                 priv = pp->private_data;
 769                 usbdev = priv->usbdev;
 770                 priv->usbdev = NULL;
 771                 priv->pp = NULL;
 772                 dev_dbg(&intf->dev, "parport_remove_port\n");
 773                 parport_remove_port(pp);
 774                 parport_put_port(pp);
 775                 kill_all_async_requests_priv(priv);
 776                 kref_put(&priv->ref_count, destroy_priv);
 777         }
 778         dev_dbg(&intf->dev, "disconnect done\n");
 779 }
 780
 781 /* table of cables that work through this driver */
 782 static const struct usb_device_id uss720_table[] = {
 783         { USB_DEVICE(0x047e, 0x1001) },
 784         { USB_DEVICE(0x0557, 0x2001) },
 785         { USB_DEVICE(0x0729, 0x1284) },
 786         { USB_DEVICE(0x1293, 0x0002) },
 787         { USB_DEVICE(0x050d, 0x0002) },
 788         { }                                             /* Terminating entry */
 789 };
 790
 791 MODULE_DEVICE_TABLE (usb, uss720_table);
 792
 793
 794 static struct usb_driver uss720_driver = {
 795         .name =         "uss720",
 796         .probe =        uss720_probe,
 797         .disconnect =   uss720_disconnect,
 798         .id_table =     uss720_table,
 799 };
 800
 801 /* --------------------------------------------------------------------- */
 802
 803 MODULE_AUTHOR(DRIVER_AUTHOR);
 804 MODULE_DESCRIPTION(DRIVER_DESC);
 805 MODULE_LICENSE("GPL");
 806
 807 static int __init uss720_init(void)
 808 {
 809         int retval;
 810         retval = usb_register(&uss720_driver);
 811         if (retval)
 812                 goto out;
 813
 814         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 815                DRIVER_DESC "\n");
 816         printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose "
 817                "driver to allow nonstandard\n");
 818         printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over "
 819                "USS720 usb to parallel cables\n");
 820         printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a "
 821                "printer, use usblp instead\n");
 822 out:
 823         return retval;
 824 }
 825
 826 static void __exit uss720_cleanup(void)
 827 {
 828         usb_deregister(&uss720_driver);
 829 }
 830
 831 module_init(uss720_init);
 832 module_exit(uss720_cleanup);
 833
 834 /* --------------------------------------------------------------------- */