1 /*****************************************************************************/ 2 3 /* 4 * uss720.c -- USS720 USB Parport Cable. 5 * 6 * Copyright (C) 1999, 2005 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 err("async_complete: urb error %d", status); 122 } else if (rq->dr.bRequest == 3) { 123 memcpy(priv->reg, rq->reg, sizeof(priv->reg)); 124 #if 0 125 dbg("async_complete regs %02x %02x %02x %02x %02x %02x %02x", 126 (unsigned int)priv->reg[0], (unsigned int)priv->reg[1], (unsigned int)priv->reg[2], 127 (unsigned int)priv->reg[3], (unsigned int)priv->reg[4], (unsigned int)priv->reg[5], 128 (unsigned int)priv->reg[6]); 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 = kmalloc(sizeof(struct uss720_async_request), mem_flags); 153 if (!rq) { 154 err("submit_async_request out of memory"); 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 err("submit_async_request out of memory"); 166 return NULL; 167 } 168 rq->dr.bRequestType = requesttype; 169 rq->dr.bRequest = request; 170 rq->dr.wValue = cpu_to_le16(value); 171 rq->dr.wIndex = cpu_to_le16(index); 172 rq->dr.wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0); 173 usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0), 174 (unsigned char *)&rq->dr, 175 (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq); 176 /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */ 177 spin_lock_irqsave(&priv->asynclock, flags); 178 list_add_tail(&rq->asynclist, &priv->asynclist); 179 spin_unlock_irqrestore(&priv->asynclock, flags); 180 ret = usb_submit_urb(rq->urb, mem_flags); 181 if (!ret) { 182 kref_get(&rq->ref_count); 183 return rq; 184 } 185 kref_put(&rq->ref_count, destroy_async); 186 err("submit_async_request submit_urb failed with %d", 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 err("get_1284_register(%u) failed", (unsigned int)reg); 222 return -EIO; 223 } 224 if (!val) { 225 kref_put(&rq->ref_count, destroy_async); 226 return 0; 227 } 228 if (wait_for_completion_timeout(&rq->compl, HZ)) { 229 ret = rq->urb->status; 230 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]]; 231 if (ret) 232 printk(KERN_WARNING "get_1284_register: " 233 "usb error %d\n", ret); 234 kref_put(&rq->ref_count, destroy_async); 235 return ret; 236 } 237 printk(KERN_WARNING "get_1284_register timeout\n"); 238 kill_all_async_requests_priv(priv); 239 return -EIO; 240 } 241 242 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags) 243 { 244 struct parport_uss720_private *priv; 245 struct uss720_async_request *rq; 246 247 if (!pp) 248 return -EIO; 249 priv = pp->private_data; 250 rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags); 251 if (!rq) { 252 err("set_1284_register(%u,%u) failed", (unsigned int)reg, (unsigned int)val); 253 return -EIO; 254 } 255 kref_put(&rq->ref_count, destroy_async); 256 return 0; 257 } 258 259 /* --------------------------------------------------------------------- */ 260 261 /* ECR modes */ 262 #define ECR_SPP 00 263 #define ECR_PS2 01 264 #define ECR_PPF 02 265 #define ECR_ECP 03 266 #define ECR_EPP 04 267 268 /* Safely change the mode bits in the ECR */ 269 static int change_mode(struct parport *pp, int m) 270 { 271 struct parport_uss720_private *priv = pp->private_data; 272 int mode; 273 __u8 reg; 274 275 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 276 return -EIO; 277 /* Bits <7:5> contain the mode. */ 278 mode = (priv->reg[2] >> 5) & 0x7; 279 if (mode == m) 280 return 0; 281 /* We have to go through mode 000 or 001 */ 282 if (mode > ECR_PS2 && m > ECR_PS2) 283 if (change_mode(pp, ECR_PS2)) 284 return -EIO; 285 286 if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) { 287 /* This mode resets the FIFO, so we may 288 * have to wait for it to drain first. */ 289 unsigned long expire = jiffies + pp->physport->cad->timeout; 290 switch (mode) { 291 case ECR_PPF: /* Parallel Port FIFO mode */ 292 case ECR_ECP: /* ECP Parallel Port mode */ 293 /* Poll slowly. */ 294 for (;;) { 295 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 296 return -EIO; 297 if (priv->reg[2] & 0x01) 298 break; 299 if (time_after_eq (jiffies, expire)) 300 /* The FIFO is stuck. */ 301 return -EBUSY; 302 msleep_interruptible(10); 303 if (signal_pending (current)) 304 break; 305 } 306 } 307 } 308 /* Set the mode. */ 309 if (set_1284_register(pp, 6, m << 5, GFP_KERNEL)) 310 return -EIO; 311 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 312 return -EIO; 313 return 0; 314 } 315 316 /* 317 * Clear TIMEOUT BIT in EPP MODE 318 */ 319 static int clear_epp_timeout(struct parport *pp) 320 { 321 unsigned char stat; 322 323 if (get_1284_register(pp, 1, &stat, GFP_KERNEL)) 324 return 1; 325 return stat & 1; 326 } 327 328 /* 329 * Access functions. 330 */ 331 #if 0 332 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id) 333 { 334 struct parport *pp = (struct parport *)dev_id; 335 struct parport_uss720_private *priv = pp->private_data; 336 337 if (usbstatus != 0 || len < 4 || !buffer) 338 return 1; 339 memcpy(priv->reg, buffer, 4); 340 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */ 341 if (priv->reg[2] & priv->reg[1] & 0x10) 342 parport_generic_irq(pp); 343 return 1; 344 } 345 #endif 346 347 static void parport_uss720_write_data(struct parport *pp, unsigned char d) 348 { 349 set_1284_register(pp, 0, d, GFP_KERNEL); 350 } 351 352 static unsigned char parport_uss720_read_data(struct parport *pp) 353 { 354 unsigned char ret; 355 356 if (get_1284_register(pp, 0, &ret, GFP_KERNEL)) 357 return 0; 358 return ret; 359 } 360 361 static void parport_uss720_write_control(struct parport *pp, unsigned char d) 362 { 363 struct parport_uss720_private *priv = pp->private_data; 364 365 d = (d & 0xf) | (priv->reg[1] & 0xf0); 366 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 367 return; 368 priv->reg[1] = d; 369 } 370 371 static unsigned char parport_uss720_read_control(struct parport *pp) 372 { 373 struct parport_uss720_private *priv = pp->private_data; 374 return priv->reg[1] & 0xf; /* Use soft copy */ 375 } 376 377 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val) 378 { 379 struct parport_uss720_private *priv = pp->private_data; 380 unsigned char d; 381 382 mask &= 0x0f; 383 val &= 0x0f; 384 d = (priv->reg[1] & (~mask)) ^ val; 385 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 386 return 0; 387 priv->reg[1] = d; 388 return d & 0xf; 389 } 390 391 static unsigned char parport_uss720_read_status(struct parport *pp) 392 { 393 unsigned char ret; 394 395 if (get_1284_register(pp, 1, &ret, GFP_KERNEL)) 396 return 0; 397 return ret & 0xf8; 398 } 399 400 static void parport_uss720_disable_irq(struct parport *pp) 401 { 402 struct parport_uss720_private *priv = pp->private_data; 403 unsigned char d; 404 405 d = priv->reg[1] & ~0x10; 406 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 407 return; 408 priv->reg[1] = d; 409 } 410 411 static void parport_uss720_enable_irq(struct parport *pp) 412 { 413 struct parport_uss720_private *priv = pp->private_data; 414 unsigned char d; 415 416 d = priv->reg[1] | 0x10; 417 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 418 return; 419 priv->reg[1] = d; 420 } 421 422 static void parport_uss720_data_forward (struct parport *pp) 423 { 424 struct parport_uss720_private *priv = pp->private_data; 425 unsigned char d; 426 427 d = priv->reg[1] & ~0x20; 428 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 429 return; 430 priv->reg[1] = d; 431 } 432 433 static void parport_uss720_data_reverse (struct parport *pp) 434 { 435 struct parport_uss720_private *priv = pp->private_data; 436 unsigned char d; 437 438 d = priv->reg[1] | 0x20; 439 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 440 return; 441 priv->reg[1] = d; 442 } 443 444 static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s) 445 { 446 s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0); 447 s->u.pc.ecr = 0x24; 448 } 449 450 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s) 451 { 452 struct parport_uss720_private *priv = pp->private_data; 453 454 #if 0 455 if (get_1284_register(pp, 2, NULL, GFP_ATOMIC)) 456 return; 457 #endif 458 s->u.pc.ctr = priv->reg[1]; 459 s->u.pc.ecr = priv->reg[2]; 460 } 461 462 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s) 463 { 464 struct parport_uss720_private *priv = pp->private_data; 465 466 set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC); 467 set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC); 468 get_1284_register(pp, 2, NULL, GFP_ATOMIC); 469 priv->reg[1] = s->u.pc.ctr; 470 priv->reg[2] = s->u.pc.ecr; 471 } 472 473 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags) 474 { 475 struct parport_uss720_private *priv = pp->private_data; 476 size_t got = 0; 477 478 if (change_mode(pp, ECR_EPP)) 479 return 0; 480 for (; got < length; got++) { 481 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL)) 482 break; 483 buf++; 484 if (priv->reg[0] & 0x01) { 485 clear_epp_timeout(pp); 486 break; 487 } 488 } 489 change_mode(pp, ECR_PS2); 490 return got; 491 } 492 493 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags) 494 { 495 #if 0 496 struct parport_uss720_private *priv = pp->private_data; 497 size_t written = 0; 498 499 if (change_mode(pp, ECR_EPP)) 500 return 0; 501 for (; written < length; written++) { 502 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL)) 503 break; 504 ((char*)buf)++; 505 if (get_1284_register(pp, 1, NULL, GFP_KERNEL)) 506 break; 507 if (priv->reg[0] & 0x01) { 508 clear_epp_timeout(pp); 509 break; 510 } 511 } 512 change_mode(pp, ECR_PS2); 513 return written; 514 #else 515 struct parport_uss720_private *priv = pp->private_data; 516 struct usb_device *usbdev = priv->usbdev; 517 int rlen; 518 int i; 519 520 if (!usbdev) 521 return 0; 522 if (change_mode(pp, ECR_EPP)) 523 return 0; 524 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000); 525 if (i) 526 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buf, length, rlen); 527 change_mode(pp, ECR_PS2); 528 return rlen; 529 #endif 530 } 531 532 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags) 533 { 534 struct parport_uss720_private *priv = pp->private_data; 535 size_t got = 0; 536 537 if (change_mode(pp, ECR_EPP)) 538 return 0; 539 for (; got < length; got++) { 540 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL)) 541 break; 542 buf++; 543 if (priv->reg[0] & 0x01) { 544 clear_epp_timeout(pp); 545 break; 546 } 547 } 548 change_mode(pp, ECR_PS2); 549 return got; 550 } 551 552 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags) 553 { 554 struct parport_uss720_private *priv = pp->private_data; 555 size_t written = 0; 556 557 if (change_mode(pp, ECR_EPP)) 558 return 0; 559 for (; written < length; written++) { 560 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL)) 561 break; 562 buf++; 563 if (get_1284_register(pp, 1, NULL, GFP_KERNEL)) 564 break; 565 if (priv->reg[0] & 0x01) { 566 clear_epp_timeout(pp); 567 break; 568 } 569 } 570 change_mode(pp, ECR_PS2); 571 return written; 572 } 573 574 static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags) 575 { 576 struct parport_uss720_private *priv = pp->private_data; 577 struct usb_device *usbdev = priv->usbdev; 578 int rlen; 579 int i; 580 581 if (!usbdev) 582 return 0; 583 if (change_mode(pp, ECR_ECP)) 584 return 0; 585 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000); 586 if (i) 587 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen); 588 change_mode(pp, ECR_PS2); 589 return rlen; 590 } 591 592 static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags) 593 { 594 struct parport_uss720_private *priv = pp->private_data; 595 struct usb_device *usbdev = priv->usbdev; 596 int rlen; 597 int i; 598 599 if (!usbdev) 600 return 0; 601 if (change_mode(pp, ECR_ECP)) 602 return 0; 603 i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000); 604 if (i) 605 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %Zu rlen %u\n", buffer, len, rlen); 606 change_mode(pp, ECR_PS2); 607 return rlen; 608 } 609 610 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags) 611 { 612 size_t written = 0; 613 614 if (change_mode(pp, ECR_ECP)) 615 return 0; 616 for (; written < len; written++) { 617 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL)) 618 break; 619 buffer++; 620 } 621 change_mode(pp, ECR_PS2); 622 return written; 623 } 624 625 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags) 626 { 627 struct parport_uss720_private *priv = pp->private_data; 628 struct usb_device *usbdev = priv->usbdev; 629 int rlen; 630 int i; 631 632 if (!usbdev) 633 return 0; 634 if (change_mode(pp, ECR_PPF)) 635 return 0; 636 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000); 637 if (i) 638 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen); 639 change_mode(pp, ECR_PS2); 640 return rlen; 641 } 642 643 /* --------------------------------------------------------------------- */ 644 645 static struct parport_operations parport_uss720_ops = 646 { 647 .owner = THIS_MODULE, 648 .write_data = parport_uss720_write_data, 649 .read_data = parport_uss720_read_data, 650 651 .write_control = parport_uss720_write_control, 652 .read_control = parport_uss720_read_control, 653 .frob_control = parport_uss720_frob_control, 654 655 .read_status = parport_uss720_read_status, 656 657 .enable_irq = parport_uss720_enable_irq, 658 .disable_irq = parport_uss720_disable_irq, 659 660 .data_forward = parport_uss720_data_forward, 661 .data_reverse = parport_uss720_data_reverse, 662 663 .init_state = parport_uss720_init_state, 664 .save_state = parport_uss720_save_state, 665 .restore_state = parport_uss720_restore_state, 666 667 .epp_write_data = parport_uss720_epp_write_data, 668 .epp_read_data = parport_uss720_epp_read_data, 669 .epp_write_addr = parport_uss720_epp_write_addr, 670 .epp_read_addr = parport_uss720_epp_read_addr, 671 672 .ecp_write_data = parport_uss720_ecp_write_data, 673 .ecp_read_data = parport_uss720_ecp_read_data, 674 .ecp_write_addr = parport_uss720_ecp_write_addr, 675 676 .compat_write_data = parport_uss720_write_compat, 677 .nibble_read_data = parport_ieee1284_read_nibble, 678 .byte_read_data = parport_ieee1284_read_byte, 679 }; 680 681 /* --------------------------------------------------------------------- */ 682 683 static int uss720_probe(struct usb_interface *intf, 684 const struct usb_device_id *id) 685 { 686 struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf)); 687 struct usb_host_interface *interface; 688 struct usb_host_endpoint *endpoint; 689 struct parport_uss720_private *priv; 690 struct parport *pp; 691 unsigned char reg; 692 int i; 693 694 dbg("probe: vendor id 0x%x, device id 0x%x\n", 695 le16_to_cpu(usbdev->descriptor.idVendor), 696 le16_to_cpu(usbdev->descriptor.idProduct)); 697 698 /* our known interfaces have 3 alternate settings */ 699 if (intf->num_altsetting != 3) { 700 usb_put_dev(usbdev); 701 return -ENODEV; 702 } 703 i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2); 704 dbg("set inteface result %d", i); 705 706 interface = intf->cur_altsetting; 707 708 /* 709 * Allocate parport interface 710 */ 711 if (!(priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL))) { 712 usb_put_dev(usbdev); 713 return -ENOMEM; 714 } 715 priv->pp = NULL; 716 priv->usbdev = usbdev; 717 kref_init(&priv->ref_count); 718 spin_lock_init(&priv->asynclock); 719 INIT_LIST_HEAD(&priv->asynclist); 720 if (!(pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops))) { 721 printk(KERN_WARNING "uss720: could not register parport\n"); 722 goto probe_abort; 723 } 724 725 priv->pp = pp; 726 pp->private_data = priv; 727 pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT; 728 729 /* set the USS720 control register to manual mode, no ECP compression, enable all ints */ 730 set_1284_register(pp, 7, 0x00, GFP_KERNEL); 731 set_1284_register(pp, 6, 0x30, GFP_KERNEL); /* PS/2 mode */ 732 set_1284_register(pp, 2, 0x0c, GFP_KERNEL); 733 /* debugging */ 734 get_1284_register(pp, 0, ®, GFP_KERNEL); 735 dbg("reg: %02x %02x %02x %02x %02x %02x %02x", 736 priv->reg[0], priv->reg[1], priv->reg[2], priv->reg[3], priv->reg[4], priv->reg[5], priv->reg[6]); 737 738 endpoint = &interface->endpoint[2]; 739 dbg("epaddr %d interval %d", endpoint->desc.bEndpointAddress, endpoint->desc.bInterval); 740 parport_announce_port(pp); 741 742 usb_set_intfdata(intf, pp); 743 return 0; 744 745 probe_abort: 746 kill_all_async_requests_priv(priv); 747 kref_put(&priv->ref_count, destroy_priv); 748 return -ENODEV; 749 } 750 751 static void uss720_disconnect(struct usb_interface *intf) 752 { 753 struct parport *pp = usb_get_intfdata(intf); 754 struct parport_uss720_private *priv; 755 struct usb_device *usbdev; 756 757 dbg("disconnect"); 758 usb_set_intfdata(intf, NULL); 759 if (pp) { 760 priv = pp->private_data; 761 usbdev = priv->usbdev; 762 priv->usbdev = NULL; 763 priv->pp = NULL; 764 dbg("parport_remove_port"); 765 parport_remove_port(pp); 766 parport_put_port(pp); 767 kill_all_async_requests_priv(priv); 768 kref_put(&priv->ref_count, destroy_priv); 769 } 770 dbg("disconnect done"); 771 } 772 773 /* table of cables that work through this driver */ 774 static const struct usb_device_id uss720_table[] = { 775 { USB_DEVICE(0x047e, 0x1001) }, 776 { USB_DEVICE(0x0557, 0x2001) }, 777 { USB_DEVICE(0x0729, 0x1284) }, 778 { USB_DEVICE(0x1293, 0x0002) }, 779 { } /* Terminating entry */ 780 }; 781 782 MODULE_DEVICE_TABLE (usb, uss720_table); 783 784 785 static struct usb_driver uss720_driver = { 786 .name = "uss720", 787 .probe = uss720_probe, 788 .disconnect = uss720_disconnect, 789 .id_table = uss720_table, 790 }; 791 792 /* --------------------------------------------------------------------- */ 793 794 MODULE_AUTHOR(DRIVER_AUTHOR); 795 MODULE_DESCRIPTION(DRIVER_DESC); 796 MODULE_LICENSE("GPL"); 797 798 static int __init uss720_init(void) 799 { 800 int retval; 801 retval = usb_register(&uss720_driver); 802 if (retval) 803 goto out; 804 805 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 806 DRIVER_DESC "\n"); 807 printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose " 808 "driver to allow nonstandard\n"); 809 printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over " 810 "USS720 usb to parallel cables\n"); 811 printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a " 812 "printer, use usblp instead\n"); 813 out: 814 return retval; 815 } 816 817 static void __exit uss720_cleanup(void) 818 { 819 usb_deregister(&uss720_driver); 820 } 821 822 module_init(uss720_init); 823 module_exit(uss720_cleanup); 824 825 /* --------------------------------------------------------------------- */ 826