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