1 // SPDX-License-Identifier: GPL-2.0+ 2 /*****************************************************************************/ 3 4 /* 5 * uss720.c -- USS720 USB Parport Cable. 6 * 7 * Copyright (C) 1999, 2005, 2010 8 * Thomas Sailer (t.sailer@alumni.ethz.ch) 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 23 * 24 * Based on parport_pc.c 25 * 26 * History: 27 * 0.1 04.08.1999 Created 28 * 0.2 07.08.1999 Some fixes mainly suggested by Tim Waugh 29 * Interrupt handling currently disabled because 30 * usb_request_irq crashes somewhere within ohci.c 31 * for no apparent reason (that is for me, anyway) 32 * ECP currently untested 33 * 0.3 10.08.1999 fixing merge errors 34 * 0.4 13.08.1999 Added Vendor/Product ID of Brad Hard's cable 35 * 0.5 20.09.1999 usb_control_msg wrapper used 36 * Nov01.2000 usb_device_table support by Adam J. Richter 37 * 08.04.2001 Identify version on module load. gb 38 * 0.6 02.09.2005 Fix "scheduling in interrupt" problem by making save/restore 39 * context asynchronous 40 * 41 */ 42 43 /*****************************************************************************/ 44 45 #include <linux/module.h> 46 #include <linux/socket.h> 47 #include <linux/parport.h> 48 #include <linux/init.h> 49 #include <linux/usb.h> 50 #include <linux/delay.h> 51 #include <linux/completion.h> 52 #include <linux/kref.h> 53 #include <linux/slab.h> 54 #include <linux/sched/signal.h> 55 56 #define DRIVER_AUTHOR "Thomas M. Sailer, t.sailer@alumni.ethz.ch" 57 #define DRIVER_DESC "USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip" 58 59 /* --------------------------------------------------------------------- */ 60 61 struct parport_uss720_private { 62 struct usb_device *usbdev; 63 struct parport *pp; 64 struct kref ref_count; 65 __u8 reg[7]; /* USB registers */ 66 struct list_head asynclist; 67 spinlock_t asynclock; 68 }; 69 70 struct uss720_async_request { 71 struct parport_uss720_private *priv; 72 struct kref ref_count; 73 struct list_head asynclist; 74 struct completion compl; 75 struct urb *urb; 76 struct usb_ctrlrequest *dr; 77 __u8 reg[7]; 78 }; 79 80 /* --------------------------------------------------------------------- */ 81 82 static void destroy_priv(struct kref *kref) 83 { 84 struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count); 85 86 dev_dbg(&priv->usbdev->dev, "destroying priv datastructure\n"); 87 usb_put_dev(priv->usbdev); 88 kfree(priv); 89 } 90 91 static void destroy_async(struct kref *kref) 92 { 93 struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count); 94 struct parport_uss720_private *priv = rq->priv; 95 unsigned long flags; 96 97 if (likely(rq->urb)) 98 usb_free_urb(rq->urb); 99 kfree(rq->dr); 100 spin_lock_irqsave(&priv->asynclock, flags); 101 list_del_init(&rq->asynclist); 102 spin_unlock_irqrestore(&priv->asynclock, flags); 103 kfree(rq); 104 kref_put(&priv->ref_count, destroy_priv); 105 } 106 107 /* --------------------------------------------------------------------- */ 108 109 static void async_complete(struct urb *urb) 110 { 111 struct uss720_async_request *rq; 112 struct parport *pp; 113 struct parport_uss720_private *priv; 114 int status = urb->status; 115 116 rq = urb->context; 117 priv = rq->priv; 118 pp = priv->pp; 119 if (status) { 120 dev_err(&urb->dev->dev, "async_complete: urb error %d\n", 121 status); 122 } else if (rq->dr->bRequest == 3) { 123 memcpy(priv->reg, rq->reg, sizeof(priv->reg)); 124 #if 0 125 dev_dbg(&priv->usbdev->dev, "async_complete regs %7ph\n", 126 priv->reg); 127 #endif 128 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */ 129 if (rq->reg[2] & rq->reg[1] & 0x10 && pp) 130 parport_generic_irq(pp); 131 } 132 complete(&rq->compl); 133 kref_put(&rq->ref_count, destroy_async); 134 } 135 136 static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv, 137 __u8 request, __u8 requesttype, __u16 value, __u16 index, 138 gfp_t mem_flags) 139 { 140 struct usb_device *usbdev; 141 struct uss720_async_request *rq; 142 unsigned long flags; 143 int ret; 144 145 if (!priv) 146 return NULL; 147 usbdev = priv->usbdev; 148 if (!usbdev) 149 return NULL; 150 rq = kzalloc(sizeof(struct uss720_async_request), mem_flags); 151 if (!rq) 152 return NULL; 153 kref_init(&rq->ref_count); 154 INIT_LIST_HEAD(&rq->asynclist); 155 init_completion(&rq->compl); 156 kref_get(&priv->ref_count); 157 rq->priv = priv; 158 rq->urb = usb_alloc_urb(0, mem_flags); 159 if (!rq->urb) { 160 kref_put(&rq->ref_count, destroy_async); 161 return NULL; 162 } 163 rq->dr = kmalloc(sizeof(*rq->dr), mem_flags); 164 if (!rq->dr) { 165 kref_put(&rq->ref_count, destroy_async); 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 kref_get(&rq->ref_count); 181 ret = usb_submit_urb(rq->urb, mem_flags); 182 if (!ret) 183 return rq; 184 destroy_async(&rq->ref_count); 185 dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret); 186 return NULL; 187 } 188 189 static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv) 190 { 191 struct uss720_async_request *rq; 192 unsigned long flags; 193 unsigned int ret = 0; 194 195 spin_lock_irqsave(&priv->asynclock, flags); 196 list_for_each_entry(rq, &priv->asynclist, asynclist) { 197 usb_unlink_urb(rq->urb); 198 ret++; 199 } 200 spin_unlock_irqrestore(&priv->asynclock, flags); 201 return ret; 202 } 203 204 /* --------------------------------------------------------------------- */ 205 206 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags) 207 { 208 struct parport_uss720_private *priv; 209 struct uss720_async_request *rq; 210 static const unsigned char regindex[9] = { 211 4, 0, 1, 5, 5, 0, 2, 3, 6 212 }; 213 int ret; 214 215 if (!pp) 216 return -EIO; 217 priv = pp->private_data; 218 rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags); 219 if (!rq) { 220 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed", 221 (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 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed", 253 (unsigned int)reg, (unsigned int)val); 254 return -EIO; 255 } 256 kref_put(&rq->ref_count, destroy_async); 257 return 0; 258 } 259 260 /* --------------------------------------------------------------------- */ 261 262 /* ECR modes */ 263 #define ECR_SPP 00 264 #define ECR_PS2 01 265 #define ECR_PPF 02 266 #define ECR_ECP 03 267 #define ECR_EPP 04 268 269 /* Safely change the mode bits in the ECR */ 270 static int change_mode(struct parport *pp, int m) 271 { 272 struct parport_uss720_private *priv = pp->private_data; 273 int mode; 274 __u8 reg; 275 276 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 277 return -EIO; 278 /* Bits <7:5> contain the mode. */ 279 mode = (priv->reg[2] >> 5) & 0x7; 280 if (mode == m) 281 return 0; 282 /* We have to go through mode 000 or 001 */ 283 if (mode > ECR_PS2 && m > ECR_PS2) 284 if (change_mode(pp, ECR_PS2)) 285 return -EIO; 286 287 if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) { 288 /* This mode resets the FIFO, so we may 289 * have to wait for it to drain first. */ 290 unsigned long expire = jiffies + pp->physport->cad->timeout; 291 switch (mode) { 292 case ECR_PPF: /* Parallel Port FIFO mode */ 293 case ECR_ECP: /* ECP Parallel Port mode */ 294 /* Poll slowly. */ 295 for (;;) { 296 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 297 return -EIO; 298 if (priv->reg[2] & 0x01) 299 break; 300 if (time_after_eq (jiffies, expire)) 301 /* The FIFO is stuck. */ 302 return -EBUSY; 303 msleep_interruptible(10); 304 if (signal_pending (current)) 305 break; 306 } 307 } 308 } 309 /* Set the mode. */ 310 if (set_1284_register(pp, 6, m << 5, GFP_KERNEL)) 311 return -EIO; 312 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 313 return -EIO; 314 return 0; 315 } 316 317 /* 318 * Clear TIMEOUT BIT in EPP MODE 319 */ 320 static int clear_epp_timeout(struct parport *pp) 321 { 322 unsigned char stat; 323 324 if (get_1284_register(pp, 1, &stat, GFP_KERNEL)) 325 return 1; 326 return stat & 1; 327 } 328 329 /* 330 * Access functions. 331 */ 332 #if 0 333 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id) 334 { 335 struct parport *pp = (struct parport *)dev_id; 336 struct parport_uss720_private *priv = pp->private_data; 337 338 if (usbstatus != 0 || len < 4 || !buffer) 339 return 1; 340 memcpy(priv->reg, buffer, 4); 341 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */ 342 if (priv->reg[2] & priv->reg[1] & 0x10) 343 parport_generic_irq(pp); 344 return 1; 345 } 346 #endif 347 348 static void parport_uss720_write_data(struct parport *pp, unsigned char d) 349 { 350 set_1284_register(pp, 0, d, GFP_KERNEL); 351 } 352 353 static unsigned char parport_uss720_read_data(struct parport *pp) 354 { 355 unsigned char ret; 356 357 if (get_1284_register(pp, 0, &ret, GFP_KERNEL)) 358 return 0; 359 return ret; 360 } 361 362 static void parport_uss720_write_control(struct parport *pp, unsigned char d) 363 { 364 struct parport_uss720_private *priv = pp->private_data; 365 366 d = (d & 0xf) | (priv->reg[1] & 0xf0); 367 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 368 return; 369 priv->reg[1] = d; 370 } 371 372 static unsigned char parport_uss720_read_control(struct parport *pp) 373 { 374 struct parport_uss720_private *priv = pp->private_data; 375 return priv->reg[1] & 0xf; /* Use soft copy */ 376 } 377 378 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val) 379 { 380 struct parport_uss720_private *priv = pp->private_data; 381 unsigned char d; 382 383 mask &= 0x0f; 384 val &= 0x0f; 385 d = (priv->reg[1] & (~mask)) ^ val; 386 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 387 return 0; 388 priv->reg[1] = d; 389 return d & 0xf; 390 } 391 392 static unsigned char parport_uss720_read_status(struct parport *pp) 393 { 394 unsigned char ret; 395 396 if (get_1284_register(pp, 1, &ret, GFP_KERNEL)) 397 return 0; 398 return ret & 0xf8; 399 } 400 401 static void parport_uss720_disable_irq(struct parport *pp) 402 { 403 struct parport_uss720_private *priv = pp->private_data; 404 unsigned char d; 405 406 d = priv->reg[1] & ~0x10; 407 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 408 return; 409 priv->reg[1] = d; 410 } 411 412 static void parport_uss720_enable_irq(struct parport *pp) 413 { 414 struct parport_uss720_private *priv = pp->private_data; 415 unsigned char d; 416 417 d = priv->reg[1] | 0x10; 418 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 419 return; 420 priv->reg[1] = d; 421 } 422 423 static void parport_uss720_data_forward (struct parport *pp) 424 { 425 struct parport_uss720_private *priv = pp->private_data; 426 unsigned char d; 427 428 d = priv->reg[1] & ~0x20; 429 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 430 return; 431 priv->reg[1] = d; 432 } 433 434 static void parport_uss720_data_reverse (struct parport *pp) 435 { 436 struct parport_uss720_private *priv = pp->private_data; 437 unsigned char d; 438 439 d = priv->reg[1] | 0x20; 440 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 441 return; 442 priv->reg[1] = d; 443 } 444 445 static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s) 446 { 447 s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0); 448 s->u.pc.ecr = 0x24; 449 } 450 451 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s) 452 { 453 struct parport_uss720_private *priv = pp->private_data; 454 455 #if 0 456 if (get_1284_register(pp, 2, NULL, GFP_ATOMIC)) 457 return; 458 #endif 459 s->u.pc.ctr = priv->reg[1]; 460 s->u.pc.ecr = priv->reg[2]; 461 } 462 463 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s) 464 { 465 struct parport_uss720_private *priv = pp->private_data; 466 467 set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC); 468 set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC); 469 get_1284_register(pp, 2, NULL, GFP_ATOMIC); 470 priv->reg[1] = s->u.pc.ctr; 471 priv->reg[2] = s->u.pc.ecr; 472 } 473 474 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags) 475 { 476 struct parport_uss720_private *priv = pp->private_data; 477 size_t got = 0; 478 479 if (change_mode(pp, ECR_EPP)) 480 return 0; 481 for (; got < length; got++) { 482 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL)) 483 break; 484 buf++; 485 if (priv->reg[0] & 0x01) { 486 clear_epp_timeout(pp); 487 break; 488 } 489 } 490 change_mode(pp, ECR_PS2); 491 return got; 492 } 493 494 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags) 495 { 496 #if 0 497 struct parport_uss720_private *priv = pp->private_data; 498 size_t written = 0; 499 500 if (change_mode(pp, ECR_EPP)) 501 return 0; 502 for (; written < length; written++) { 503 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL)) 504 break; 505 ((char*)buf)++; 506 if (get_1284_register(pp, 1, NULL, GFP_KERNEL)) 507 break; 508 if (priv->reg[0] & 0x01) { 509 clear_epp_timeout(pp); 510 break; 511 } 512 } 513 change_mode(pp, ECR_PS2); 514 return written; 515 #else 516 struct parport_uss720_private *priv = pp->private_data; 517 struct usb_device *usbdev = priv->usbdev; 518 int rlen; 519 int i; 520 521 if (!usbdev) 522 return 0; 523 if (change_mode(pp, ECR_EPP)) 524 return 0; 525 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000); 526 if (i) 527 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buf, length, rlen); 528 change_mode(pp, ECR_PS2); 529 return rlen; 530 #endif 531 } 532 533 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags) 534 { 535 struct parport_uss720_private *priv = pp->private_data; 536 size_t got = 0; 537 538 if (change_mode(pp, ECR_EPP)) 539 return 0; 540 for (; got < length; got++) { 541 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL)) 542 break; 543 buf++; 544 if (priv->reg[0] & 0x01) { 545 clear_epp_timeout(pp); 546 break; 547 } 548 } 549 change_mode(pp, ECR_PS2); 550 return got; 551 } 552 553 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags) 554 { 555 struct parport_uss720_private *priv = pp->private_data; 556 size_t written = 0; 557 558 if (change_mode(pp, ECR_EPP)) 559 return 0; 560 for (; written < length; written++) { 561 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL)) 562 break; 563 buf++; 564 if (get_1284_register(pp, 1, NULL, GFP_KERNEL)) 565 break; 566 if (priv->reg[0] & 0x01) { 567 clear_epp_timeout(pp); 568 break; 569 } 570 } 571 change_mode(pp, ECR_PS2); 572 return written; 573 } 574 575 static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags) 576 { 577 struct parport_uss720_private *priv = pp->private_data; 578 struct usb_device *usbdev = priv->usbdev; 579 int rlen; 580 int i; 581 582 if (!usbdev) 583 return 0; 584 if (change_mode(pp, ECR_ECP)) 585 return 0; 586 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000); 587 if (i) 588 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen); 589 change_mode(pp, ECR_PS2); 590 return rlen; 591 } 592 593 static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags) 594 { 595 struct parport_uss720_private *priv = pp->private_data; 596 struct usb_device *usbdev = priv->usbdev; 597 int rlen; 598 int i; 599 600 if (!usbdev) 601 return 0; 602 if (change_mode(pp, ECR_ECP)) 603 return 0; 604 i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000); 605 if (i) 606 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %zu rlen %u\n", buffer, len, rlen); 607 change_mode(pp, ECR_PS2); 608 return rlen; 609 } 610 611 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags) 612 { 613 size_t written = 0; 614 615 if (change_mode(pp, ECR_ECP)) 616 return 0; 617 for (; written < len; written++) { 618 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL)) 619 break; 620 buffer++; 621 } 622 change_mode(pp, ECR_PS2); 623 return written; 624 } 625 626 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags) 627 { 628 struct parport_uss720_private *priv = pp->private_data; 629 struct usb_device *usbdev = priv->usbdev; 630 int rlen; 631 int i; 632 633 if (!usbdev) 634 return 0; 635 if (change_mode(pp, ECR_PPF)) 636 return 0; 637 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000); 638 if (i) 639 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen); 640 change_mode(pp, ECR_PS2); 641 return rlen; 642 } 643 644 /* --------------------------------------------------------------------- */ 645 646 static struct parport_operations parport_uss720_ops = 647 { 648 .owner = THIS_MODULE, 649 .write_data = parport_uss720_write_data, 650 .read_data = parport_uss720_read_data, 651 652 .write_control = parport_uss720_write_control, 653 .read_control = parport_uss720_read_control, 654 .frob_control = parport_uss720_frob_control, 655 656 .read_status = parport_uss720_read_status, 657 658 .enable_irq = parport_uss720_enable_irq, 659 .disable_irq = parport_uss720_disable_irq, 660 661 .data_forward = parport_uss720_data_forward, 662 .data_reverse = parport_uss720_data_reverse, 663 664 .init_state = parport_uss720_init_state, 665 .save_state = parport_uss720_save_state, 666 .restore_state = parport_uss720_restore_state, 667 668 .epp_write_data = parport_uss720_epp_write_data, 669 .epp_read_data = parport_uss720_epp_read_data, 670 .epp_write_addr = parport_uss720_epp_write_addr, 671 .epp_read_addr = parport_uss720_epp_read_addr, 672 673 .ecp_write_data = parport_uss720_ecp_write_data, 674 .ecp_read_data = parport_uss720_ecp_read_data, 675 .ecp_write_addr = parport_uss720_ecp_write_addr, 676 677 .compat_write_data = parport_uss720_write_compat, 678 .nibble_read_data = parport_ieee1284_read_nibble, 679 .byte_read_data = parport_ieee1284_read_byte, 680 }; 681 682 /* --------------------------------------------------------------------- */ 683 684 static int uss720_probe(struct usb_interface *intf, 685 const struct usb_device_id *id) 686 { 687 struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf)); 688 struct usb_host_interface *interface; 689 struct usb_endpoint_descriptor *epd; 690 struct parport_uss720_private *priv; 691 struct parport *pp; 692 unsigned char reg; 693 int i; 694 695 dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n", 696 le16_to_cpu(usbdev->descriptor.idVendor), 697 le16_to_cpu(usbdev->descriptor.idProduct)); 698 699 /* our known interfaces have 3 alternate settings */ 700 if (intf->num_altsetting != 3) { 701 usb_put_dev(usbdev); 702 return -ENODEV; 703 } 704 i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2); 705 dev_dbg(&intf->dev, "set interface result %d\n", i); 706 707 interface = intf->cur_altsetting; 708 709 if (interface->desc.bNumEndpoints < 3) { 710 usb_put_dev(usbdev); 711 return -ENODEV; 712 } 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, ®, GFP_KERNEL); 743 dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg); 744 745 i = usb_find_last_int_in_endpoint(interface, &epd); 746 if (!i) { 747 dev_dbg(&intf->dev, "epaddr %d interval %d\n", 748 epd->bEndpointAddress, epd->bInterval); 749 } 750 parport_announce_port(pp); 751 752 usb_set_intfdata(intf, pp); 753 return 0; 754 755 probe_abort: 756 kill_all_async_requests_priv(priv); 757 kref_put(&priv->ref_count, destroy_priv); 758 return -ENODEV; 759 } 760 761 static void uss720_disconnect(struct usb_interface *intf) 762 { 763 struct parport *pp = usb_get_intfdata(intf); 764 struct parport_uss720_private *priv; 765 struct usb_device *usbdev; 766 767 dev_dbg(&intf->dev, "disconnect\n"); 768 usb_set_intfdata(intf, NULL); 769 if (pp) { 770 priv = pp->private_data; 771 usbdev = priv->usbdev; 772 priv->usbdev = NULL; 773 priv->pp = NULL; 774 dev_dbg(&intf->dev, "parport_remove_port\n"); 775 parport_remove_port(pp); 776 parport_put_port(pp); 777 kill_all_async_requests_priv(priv); 778 kref_put(&priv->ref_count, destroy_priv); 779 } 780 dev_dbg(&intf->dev, "disconnect done\n"); 781 } 782 783 /* table of cables that work through this driver */ 784 static const struct usb_device_id uss720_table[] = { 785 { USB_DEVICE(0x047e, 0x1001) }, 786 { USB_DEVICE(0x0557, 0x2001) }, 787 { USB_DEVICE(0x0729, 0x1284) }, 788 { USB_DEVICE(0x1293, 0x0002) }, 789 { USB_DEVICE(0x050d, 0x0002) }, 790 { } /* Terminating entry */ 791 }; 792 793 MODULE_DEVICE_TABLE (usb, uss720_table); 794 795 796 static struct usb_driver uss720_driver = { 797 .name = "uss720", 798 .probe = uss720_probe, 799 .disconnect = uss720_disconnect, 800 .id_table = uss720_table, 801 }; 802 803 /* --------------------------------------------------------------------- */ 804 805 MODULE_AUTHOR(DRIVER_AUTHOR); 806 MODULE_DESCRIPTION(DRIVER_DESC); 807 MODULE_LICENSE("GPL"); 808 809 static int __init uss720_init(void) 810 { 811 int retval; 812 retval = usb_register(&uss720_driver); 813 if (retval) 814 goto out; 815 816 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n"); 817 printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose " 818 "driver to allow nonstandard\n"); 819 printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over " 820 "USS720 usb to parallel cables\n"); 821 printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a " 822 "printer, use usblp instead\n"); 823 out: 824 return retval; 825 } 826 827 static void __exit uss720_cleanup(void) 828 { 829 usb_deregister(&uss720_driver); 830 } 831 832 module_init(uss720_init); 833 module_exit(uss720_cleanup); 834 835 /* --------------------------------------------------------------------- */ 836