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 * Based on parport_pc.c 11 * 12 * History: 13 * 0.1 04.08.1999 Created 14 * 0.2 07.08.1999 Some fixes mainly suggested by Tim Waugh 15 * Interrupt handling currently disabled because 16 * usb_request_irq crashes somewhere within ohci.c 17 * for no apparent reason (that is for me, anyway) 18 * ECP currently untested 19 * 0.3 10.08.1999 fixing merge errors 20 * 0.4 13.08.1999 Added Vendor/Product ID of Brad Hard's cable 21 * 0.5 20.09.1999 usb_control_msg wrapper used 22 * Nov01.2000 usb_device_table support by Adam J. Richter 23 * 08.04.2001 Identify version on module load. gb 24 * 0.6 02.09.2005 Fix "scheduling in interrupt" problem by making save/restore 25 * context asynchronous 26 * 27 */ 28 29 /*****************************************************************************/ 30 31 #include <linux/module.h> 32 #include <linux/socket.h> 33 #include <linux/parport.h> 34 #include <linux/init.h> 35 #include <linux/usb.h> 36 #include <linux/delay.h> 37 #include <linux/completion.h> 38 #include <linux/kref.h> 39 #include <linux/slab.h> 40 #include <linux/sched/signal.h> 41 42 #define DRIVER_AUTHOR "Thomas M. Sailer, t.sailer@alumni.ethz.ch" 43 #define DRIVER_DESC "USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip" 44 45 /* --------------------------------------------------------------------- */ 46 47 struct parport_uss720_private { 48 struct usb_device *usbdev; 49 struct parport *pp; 50 struct kref ref_count; 51 __u8 reg[7]; /* USB registers */ 52 struct list_head asynclist; 53 spinlock_t asynclock; 54 }; 55 56 struct uss720_async_request { 57 struct parport_uss720_private *priv; 58 struct kref ref_count; 59 struct list_head asynclist; 60 struct completion compl; 61 struct urb *urb; 62 struct usb_ctrlrequest *dr; 63 __u8 reg[7]; 64 }; 65 66 /* --------------------------------------------------------------------- */ 67 68 static void destroy_priv(struct kref *kref) 69 { 70 struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count); 71 72 dev_dbg(&priv->usbdev->dev, "destroying priv datastructure\n"); 73 usb_put_dev(priv->usbdev); 74 priv->usbdev = NULL; 75 kfree(priv); 76 } 77 78 static void destroy_async(struct kref *kref) 79 { 80 struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count); 81 struct parport_uss720_private *priv = rq->priv; 82 unsigned long flags; 83 84 if (likely(rq->urb)) 85 usb_free_urb(rq->urb); 86 kfree(rq->dr); 87 spin_lock_irqsave(&priv->asynclock, flags); 88 list_del_init(&rq->asynclist); 89 spin_unlock_irqrestore(&priv->asynclock, flags); 90 kfree(rq); 91 kref_put(&priv->ref_count, destroy_priv); 92 } 93 94 /* --------------------------------------------------------------------- */ 95 96 static void async_complete(struct urb *urb) 97 { 98 struct uss720_async_request *rq; 99 struct parport *pp; 100 struct parport_uss720_private *priv; 101 int status = urb->status; 102 103 rq = urb->context; 104 priv = rq->priv; 105 pp = priv->pp; 106 if (status) { 107 dev_err(&urb->dev->dev, "async_complete: urb error %d\n", 108 status); 109 } else if (rq->dr->bRequest == 3) { 110 memcpy(priv->reg, rq->reg, sizeof(priv->reg)); 111 #if 0 112 dev_dbg(&priv->usbdev->dev, "async_complete regs %7ph\n", 113 priv->reg); 114 #endif 115 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */ 116 if (rq->reg[2] & rq->reg[1] & 0x10 && pp) 117 parport_generic_irq(pp); 118 } 119 complete(&rq->compl); 120 kref_put(&rq->ref_count, destroy_async); 121 } 122 123 static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv, 124 __u8 request, __u8 requesttype, __u16 value, __u16 index, 125 gfp_t mem_flags) 126 { 127 struct usb_device *usbdev; 128 struct uss720_async_request *rq; 129 unsigned long flags; 130 int ret; 131 132 if (!priv) 133 return NULL; 134 usbdev = priv->usbdev; 135 if (!usbdev) 136 return NULL; 137 rq = kzalloc(sizeof(struct uss720_async_request), mem_flags); 138 if (!rq) 139 return NULL; 140 kref_init(&rq->ref_count); 141 INIT_LIST_HEAD(&rq->asynclist); 142 init_completion(&rq->compl); 143 kref_get(&priv->ref_count); 144 rq->priv = priv; 145 rq->urb = usb_alloc_urb(0, mem_flags); 146 if (!rq->urb) { 147 kref_put(&rq->ref_count, destroy_async); 148 return NULL; 149 } 150 rq->dr = kmalloc(sizeof(*rq->dr), mem_flags); 151 if (!rq->dr) { 152 kref_put(&rq->ref_count, destroy_async); 153 return NULL; 154 } 155 rq->dr->bRequestType = requesttype; 156 rq->dr->bRequest = request; 157 rq->dr->wValue = cpu_to_le16(value); 158 rq->dr->wIndex = cpu_to_le16(index); 159 rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0); 160 usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0), 161 (unsigned char *)rq->dr, 162 (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq); 163 /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */ 164 spin_lock_irqsave(&priv->asynclock, flags); 165 list_add_tail(&rq->asynclist, &priv->asynclist); 166 spin_unlock_irqrestore(&priv->asynclock, flags); 167 kref_get(&rq->ref_count); 168 ret = usb_submit_urb(rq->urb, mem_flags); 169 if (!ret) 170 return rq; 171 destroy_async(&rq->ref_count); 172 dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret); 173 return NULL; 174 } 175 176 static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv) 177 { 178 struct uss720_async_request *rq; 179 unsigned long flags; 180 unsigned int ret = 0; 181 182 spin_lock_irqsave(&priv->asynclock, flags); 183 list_for_each_entry(rq, &priv->asynclist, asynclist) { 184 usb_unlink_urb(rq->urb); 185 ret++; 186 } 187 spin_unlock_irqrestore(&priv->asynclock, flags); 188 return ret; 189 } 190 191 /* --------------------------------------------------------------------- */ 192 193 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags) 194 { 195 struct parport_uss720_private *priv; 196 struct uss720_async_request *rq; 197 static const unsigned char regindex[9] = { 198 4, 0, 1, 5, 5, 0, 2, 3, 6 199 }; 200 int ret; 201 202 if (!pp) 203 return -EIO; 204 priv = pp->private_data; 205 rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags); 206 if (!rq) { 207 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed", 208 (unsigned int)reg); 209 return -EIO; 210 } 211 if (!val) { 212 kref_put(&rq->ref_count, destroy_async); 213 return 0; 214 } 215 if (wait_for_completion_timeout(&rq->compl, HZ)) { 216 ret = rq->urb->status; 217 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]]; 218 if (ret) 219 printk(KERN_WARNING "get_1284_register: " 220 "usb error %d\n", ret); 221 kref_put(&rq->ref_count, destroy_async); 222 return ret; 223 } 224 printk(KERN_WARNING "get_1284_register timeout\n"); 225 kill_all_async_requests_priv(priv); 226 return -EIO; 227 } 228 229 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags) 230 { 231 struct parport_uss720_private *priv; 232 struct uss720_async_request *rq; 233 234 if (!pp) 235 return -EIO; 236 priv = pp->private_data; 237 rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags); 238 if (!rq) { 239 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed", 240 (unsigned int)reg, (unsigned int)val); 241 return -EIO; 242 } 243 kref_put(&rq->ref_count, destroy_async); 244 return 0; 245 } 246 247 /* --------------------------------------------------------------------- */ 248 249 /* ECR modes */ 250 #define ECR_SPP 00 251 #define ECR_PS2 01 252 #define ECR_PPF 02 253 #define ECR_ECP 03 254 #define ECR_EPP 04 255 256 /* Safely change the mode bits in the ECR */ 257 static int change_mode(struct parport *pp, int m) 258 { 259 struct parport_uss720_private *priv = pp->private_data; 260 int mode; 261 __u8 reg; 262 263 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 264 return -EIO; 265 /* Bits <7:5> contain the mode. */ 266 mode = (priv->reg[2] >> 5) & 0x7; 267 if (mode == m) 268 return 0; 269 /* We have to go through mode 000 or 001 */ 270 if (mode > ECR_PS2 && m > ECR_PS2) 271 if (change_mode(pp, ECR_PS2)) 272 return -EIO; 273 274 if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) { 275 /* This mode resets the FIFO, so we may 276 * have to wait for it to drain first. */ 277 unsigned long expire = jiffies + pp->physport->cad->timeout; 278 switch (mode) { 279 case ECR_PPF: /* Parallel Port FIFO mode */ 280 case ECR_ECP: /* ECP Parallel Port mode */ 281 /* Poll slowly. */ 282 for (;;) { 283 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 284 return -EIO; 285 if (priv->reg[2] & 0x01) 286 break; 287 if (time_after_eq (jiffies, expire)) 288 /* The FIFO is stuck. */ 289 return -EBUSY; 290 msleep_interruptible(10); 291 if (signal_pending (current)) 292 break; 293 } 294 } 295 } 296 /* Set the mode. */ 297 if (set_1284_register(pp, 6, m << 5, GFP_KERNEL)) 298 return -EIO; 299 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 300 return -EIO; 301 return 0; 302 } 303 304 /* 305 * Clear TIMEOUT BIT in EPP MODE 306 */ 307 static int clear_epp_timeout(struct parport *pp) 308 { 309 unsigned char stat; 310 311 if (get_1284_register(pp, 1, &stat, GFP_KERNEL)) 312 return 1; 313 return stat & 1; 314 } 315 316 /* 317 * Access functions. 318 */ 319 #if 0 320 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id) 321 { 322 struct parport *pp = (struct parport *)dev_id; 323 struct parport_uss720_private *priv = pp->private_data; 324 325 if (usbstatus != 0 || len < 4 || !buffer) 326 return 1; 327 memcpy(priv->reg, buffer, 4); 328 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */ 329 if (priv->reg[2] & priv->reg[1] & 0x10) 330 parport_generic_irq(pp); 331 return 1; 332 } 333 #endif 334 335 static void parport_uss720_write_data(struct parport *pp, unsigned char d) 336 { 337 set_1284_register(pp, 0, d, GFP_KERNEL); 338 } 339 340 static unsigned char parport_uss720_read_data(struct parport *pp) 341 { 342 unsigned char ret; 343 344 if (get_1284_register(pp, 0, &ret, GFP_KERNEL)) 345 return 0; 346 return ret; 347 } 348 349 static void parport_uss720_write_control(struct parport *pp, unsigned char d) 350 { 351 struct parport_uss720_private *priv = pp->private_data; 352 353 d = (d & 0xf) | (priv->reg[1] & 0xf0); 354 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 355 return; 356 priv->reg[1] = d; 357 } 358 359 static unsigned char parport_uss720_read_control(struct parport *pp) 360 { 361 struct parport_uss720_private *priv = pp->private_data; 362 return priv->reg[1] & 0xf; /* Use soft copy */ 363 } 364 365 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val) 366 { 367 struct parport_uss720_private *priv = pp->private_data; 368 unsigned char d; 369 370 mask &= 0x0f; 371 val &= 0x0f; 372 d = (priv->reg[1] & (~mask)) ^ val; 373 if (set_1284_register(pp, 2, d, GFP_ATOMIC)) 374 return 0; 375 priv->reg[1] = d; 376 return d & 0xf; 377 } 378 379 static unsigned char parport_uss720_read_status(struct parport *pp) 380 { 381 unsigned char ret; 382 383 if (get_1284_register(pp, 1, &ret, GFP_ATOMIC)) 384 return 0; 385 return ret & 0xf8; 386 } 387 388 static void parport_uss720_disable_irq(struct parport *pp) 389 { 390 struct parport_uss720_private *priv = pp->private_data; 391 unsigned char d; 392 393 d = priv->reg[1] & ~0x10; 394 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 395 return; 396 priv->reg[1] = d; 397 } 398 399 static void parport_uss720_enable_irq(struct parport *pp) 400 { 401 struct parport_uss720_private *priv = pp->private_data; 402 unsigned char d; 403 404 d = priv->reg[1] | 0x10; 405 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 406 return; 407 priv->reg[1] = d; 408 } 409 410 static void parport_uss720_data_forward (struct parport *pp) 411 { 412 struct parport_uss720_private *priv = pp->private_data; 413 unsigned char d; 414 415 d = priv->reg[1] & ~0x20; 416 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 417 return; 418 priv->reg[1] = d; 419 } 420 421 static void parport_uss720_data_reverse (struct parport *pp) 422 { 423 struct parport_uss720_private *priv = pp->private_data; 424 unsigned char d; 425 426 d = priv->reg[1] | 0x20; 427 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 428 return; 429 priv->reg[1] = d; 430 } 431 432 static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s) 433 { 434 s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0); 435 s->u.pc.ecr = 0x24; 436 } 437 438 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s) 439 { 440 struct parport_uss720_private *priv = pp->private_data; 441 442 #if 0 443 if (get_1284_register(pp, 2, NULL, GFP_ATOMIC)) 444 return; 445 #endif 446 s->u.pc.ctr = priv->reg[1]; 447 s->u.pc.ecr = priv->reg[2]; 448 } 449 450 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s) 451 { 452 struct parport_uss720_private *priv = pp->private_data; 453 454 set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC); 455 set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC); 456 get_1284_register(pp, 2, NULL, GFP_ATOMIC); 457 priv->reg[1] = s->u.pc.ctr; 458 priv->reg[2] = s->u.pc.ecr; 459 } 460 461 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags) 462 { 463 struct parport_uss720_private *priv = pp->private_data; 464 size_t got = 0; 465 466 if (change_mode(pp, ECR_EPP)) 467 return 0; 468 for (; got < length; got++) { 469 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL)) 470 break; 471 buf++; 472 if (priv->reg[0] & 0x01) { 473 clear_epp_timeout(pp); 474 break; 475 } 476 } 477 change_mode(pp, ECR_PS2); 478 return got; 479 } 480 481 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags) 482 { 483 #if 0 484 struct parport_uss720_private *priv = pp->private_data; 485 size_t written = 0; 486 487 if (change_mode(pp, ECR_EPP)) 488 return 0; 489 for (; written < length; written++) { 490 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL)) 491 break; 492 ((char*)buf)++; 493 if (get_1284_register(pp, 1, NULL, GFP_KERNEL)) 494 break; 495 if (priv->reg[0] & 0x01) { 496 clear_epp_timeout(pp); 497 break; 498 } 499 } 500 change_mode(pp, ECR_PS2); 501 return written; 502 #else 503 struct parport_uss720_private *priv = pp->private_data; 504 struct usb_device *usbdev = priv->usbdev; 505 int rlen = 0; 506 int i; 507 508 if (!usbdev) 509 return 0; 510 if (change_mode(pp, ECR_EPP)) 511 return 0; 512 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000); 513 if (i) 514 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buf, length, rlen); 515 change_mode(pp, ECR_PS2); 516 return rlen; 517 #endif 518 } 519 520 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags) 521 { 522 struct parport_uss720_private *priv = pp->private_data; 523 size_t got = 0; 524 525 if (change_mode(pp, ECR_EPP)) 526 return 0; 527 for (; got < length; got++) { 528 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL)) 529 break; 530 buf++; 531 if (priv->reg[0] & 0x01) { 532 clear_epp_timeout(pp); 533 break; 534 } 535 } 536 change_mode(pp, ECR_PS2); 537 return got; 538 } 539 540 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags) 541 { 542 struct parport_uss720_private *priv = pp->private_data; 543 size_t written = 0; 544 545 if (change_mode(pp, ECR_EPP)) 546 return 0; 547 for (; written < length; written++) { 548 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL)) 549 break; 550 buf++; 551 if (get_1284_register(pp, 1, NULL, GFP_KERNEL)) 552 break; 553 if (priv->reg[0] & 0x01) { 554 clear_epp_timeout(pp); 555 break; 556 } 557 } 558 change_mode(pp, ECR_PS2); 559 return written; 560 } 561 562 static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags) 563 { 564 struct parport_uss720_private *priv = pp->private_data; 565 struct usb_device *usbdev = priv->usbdev; 566 int rlen = 0; 567 int i; 568 569 if (!usbdev) 570 return 0; 571 if (change_mode(pp, ECR_ECP)) 572 return 0; 573 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000); 574 if (i) 575 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen); 576 change_mode(pp, ECR_PS2); 577 return rlen; 578 } 579 580 static size_t parport_uss720_ecp_read_data(struct parport *pp, 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 = 0; 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_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000); 592 if (i) 593 printk(KERN_ERR "uss720: recvbulk ep 2 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_write_addr(struct parport *pp, const void *buffer, size_t len, int flags) 599 { 600 size_t written = 0; 601 602 if (change_mode(pp, ECR_ECP)) 603 return 0; 604 for (; written < len; written++) { 605 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL)) 606 break; 607 buffer++; 608 } 609 change_mode(pp, ECR_PS2); 610 return written; 611 } 612 613 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags) 614 { 615 struct parport_uss720_private *priv = pp->private_data; 616 struct usb_device *usbdev = priv->usbdev; 617 int rlen = 0; 618 int i; 619 620 if (!usbdev) 621 return 0; 622 if (change_mode(pp, ECR_PPF)) 623 return 0; 624 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000); 625 if (i) 626 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen); 627 change_mode(pp, ECR_PS2); 628 return rlen; 629 } 630 631 /* --------------------------------------------------------------------- */ 632 633 static struct parport_operations parport_uss720_ops = 634 { 635 .owner = THIS_MODULE, 636 .write_data = parport_uss720_write_data, 637 .read_data = parport_uss720_read_data, 638 639 .write_control = parport_uss720_write_control, 640 .read_control = parport_uss720_read_control, 641 .frob_control = parport_uss720_frob_control, 642 643 .read_status = parport_uss720_read_status, 644 645 .enable_irq = parport_uss720_enable_irq, 646 .disable_irq = parport_uss720_disable_irq, 647 648 .data_forward = parport_uss720_data_forward, 649 .data_reverse = parport_uss720_data_reverse, 650 651 .init_state = parport_uss720_init_state, 652 .save_state = parport_uss720_save_state, 653 .restore_state = parport_uss720_restore_state, 654 655 .epp_write_data = parport_uss720_epp_write_data, 656 .epp_read_data = parport_uss720_epp_read_data, 657 .epp_write_addr = parport_uss720_epp_write_addr, 658 .epp_read_addr = parport_uss720_epp_read_addr, 659 660 .ecp_write_data = parport_uss720_ecp_write_data, 661 .ecp_read_data = parport_uss720_ecp_read_data, 662 .ecp_write_addr = parport_uss720_ecp_write_addr, 663 664 .compat_write_data = parport_uss720_write_compat, 665 .nibble_read_data = parport_ieee1284_read_nibble, 666 .byte_read_data = parport_ieee1284_read_byte, 667 }; 668 669 /* --------------------------------------------------------------------- */ 670 671 static int uss720_probe(struct usb_interface *intf, 672 const struct usb_device_id *id) 673 { 674 struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf)); 675 struct usb_host_interface *interface; 676 struct usb_endpoint_descriptor *epd; 677 struct parport_uss720_private *priv; 678 struct parport *pp; 679 unsigned char reg; 680 int ret; 681 682 dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n", 683 le16_to_cpu(usbdev->descriptor.idVendor), 684 le16_to_cpu(usbdev->descriptor.idProduct)); 685 686 /* our known interfaces have 3 alternate settings */ 687 if (intf->num_altsetting != 3) { 688 usb_put_dev(usbdev); 689 return -ENODEV; 690 } 691 ret = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2); 692 dev_dbg(&intf->dev, "set interface result %d\n", ret); 693 694 interface = intf->cur_altsetting; 695 696 if (interface->desc.bNumEndpoints < 3) { 697 usb_put_dev(usbdev); 698 return -ENODEV; 699 } 700 701 /* 702 * Allocate parport interface 703 */ 704 priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL); 705 if (!priv) { 706 usb_put_dev(usbdev); 707 return -ENOMEM; 708 } 709 priv->pp = NULL; 710 priv->usbdev = usbdev; 711 kref_init(&priv->ref_count); 712 spin_lock_init(&priv->asynclock); 713 INIT_LIST_HEAD(&priv->asynclist); 714 pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops); 715 if (!pp) { 716 printk(KERN_WARNING "uss720: could not register parport\n"); 717 goto probe_abort; 718 } 719 720 priv->pp = pp; 721 pp->private_data = priv; 722 pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT; 723 724 /* set the USS720 control register to manual mode, no ECP compression, enable all ints */ 725 set_1284_register(pp, 7, 0x00, GFP_KERNEL); 726 set_1284_register(pp, 6, 0x30, GFP_KERNEL); /* PS/2 mode */ 727 set_1284_register(pp, 2, 0x0c, GFP_KERNEL); 728 729 /* The Belkin F5U002 Rev 2 P80453-B USB parallel port adapter shares the 730 * device ID 050d:0002 with some other device that works with this 731 * driver, but it itself does not. Detect and handle the bad cable 732 * here. */ 733 ret = get_1284_register(pp, 0, ®, GFP_KERNEL); 734 dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg); 735 if (ret < 0) 736 return ret; 737 738 ret = usb_find_last_int_in_endpoint(interface, &epd); 739 if (!ret) { 740 dev_dbg(&intf->dev, "epaddr %d interval %d\n", 741 epd->bEndpointAddress, epd->bInterval); 742 } 743 parport_announce_port(pp); 744 745 usb_set_intfdata(intf, pp); 746 return 0; 747 748 probe_abort: 749 kill_all_async_requests_priv(priv); 750 kref_put(&priv->ref_count, destroy_priv); 751 return -ENODEV; 752 } 753 754 static void uss720_disconnect(struct usb_interface *intf) 755 { 756 struct parport *pp = usb_get_intfdata(intf); 757 struct parport_uss720_private *priv; 758 759 dev_dbg(&intf->dev, "disconnect\n"); 760 usb_set_intfdata(intf, NULL); 761 if (pp) { 762 priv = pp->private_data; 763 priv->pp = NULL; 764 dev_dbg(&intf->dev, "parport_remove_port\n"); 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 dev_dbg(&intf->dev, "disconnect done\n"); 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(0x04b8, 0x0002) }, 777 { USB_DEVICE(0x04b8, 0x0003) }, 778 { USB_DEVICE(0x050d, 0x0002) }, 779 { USB_DEVICE(0x050d, 0x1202) }, 780 { USB_DEVICE(0x0557, 0x2001) }, 781 { USB_DEVICE(0x05ab, 0x0002) }, 782 { USB_DEVICE(0x06c6, 0x0100) }, 783 { USB_DEVICE(0x0729, 0x1284) }, 784 { USB_DEVICE(0x1293, 0x0002) }, 785 { } /* Terminating entry */ 786 }; 787 788 MODULE_DEVICE_TABLE (usb, uss720_table); 789 790 791 static struct usb_driver uss720_driver = { 792 .name = "uss720", 793 .probe = uss720_probe, 794 .disconnect = uss720_disconnect, 795 .id_table = uss720_table, 796 }; 797 798 /* --------------------------------------------------------------------- */ 799 800 MODULE_AUTHOR(DRIVER_AUTHOR); 801 MODULE_DESCRIPTION(DRIVER_DESC); 802 MODULE_LICENSE("GPL"); 803 804 static int __init uss720_init(void) 805 { 806 int retval; 807 retval = usb_register(&uss720_driver); 808 if (retval) 809 goto out; 810 811 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n"); 812 printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose " 813 "driver to allow nonstandard\n"); 814 printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over " 815 "USS720 usb to parallel cables\n"); 816 printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a " 817 "printer, use usblp instead\n"); 818 out: 819 return retval; 820 } 821 822 static void __exit uss720_cleanup(void) 823 { 824 usb_deregister(&uss720_driver); 825 } 826 827 module_init(uss720_init); 828 module_exit(uss720_cleanup); 829 830 /* --------------------------------------------------------------------- */ 831