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_obj(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_obj(*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 kref_put(&rq->ref_count, destroy_async); 227 return -EIO; 228 } 229 230 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags) 231 { 232 struct parport_uss720_private *priv; 233 struct uss720_async_request *rq; 234 235 if (!pp) 236 return -EIO; 237 priv = pp->private_data; 238 rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags); 239 if (!rq) { 240 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed", 241 (unsigned int)reg, (unsigned int)val); 242 return -EIO; 243 } 244 kref_put(&rq->ref_count, destroy_async); 245 return 0; 246 } 247 248 /* --------------------------------------------------------------------- */ 249 250 /* ECR modes */ 251 #define ECR_SPP 00 252 #define ECR_PS2 01 253 #define ECR_PPF 02 254 #define ECR_ECP 03 255 #define ECR_EPP 04 256 257 /* Safely change the mode bits in the ECR */ 258 static int change_mode(struct parport *pp, int m) 259 { 260 struct parport_uss720_private *priv = pp->private_data; 261 int mode; 262 __u8 reg; 263 264 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 265 return -EIO; 266 /* Bits <7:5> contain the mode. */ 267 mode = (priv->reg[2] >> 5) & 0x7; 268 if (mode == m) 269 return 0; 270 /* We have to go through mode 000 or 001 */ 271 if (mode > ECR_PS2 && m > ECR_PS2) 272 if (change_mode(pp, ECR_PS2)) 273 return -EIO; 274 275 if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) { 276 /* This mode resets the FIFO, so we may 277 * have to wait for it to drain first. */ 278 unsigned long expire = jiffies + pp->physport->cad->timeout; 279 switch (mode) { 280 case ECR_PPF: /* Parallel Port FIFO mode */ 281 case ECR_ECP: /* ECP Parallel Port mode */ 282 /* Poll slowly. */ 283 for (;;) { 284 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 285 return -EIO; 286 if (priv->reg[2] & 0x01) 287 break; 288 if (time_after_eq (jiffies, expire)) 289 /* The FIFO is stuck. */ 290 return -EBUSY; 291 msleep_interruptible(10); 292 if (signal_pending (current)) 293 break; 294 } 295 } 296 } 297 /* Set the mode. */ 298 if (set_1284_register(pp, 6, m << 5, GFP_KERNEL)) 299 return -EIO; 300 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 301 return -EIO; 302 return 0; 303 } 304 305 /* 306 * Clear TIMEOUT BIT in EPP MODE 307 */ 308 static int clear_epp_timeout(struct parport *pp) 309 { 310 unsigned char stat; 311 312 if (get_1284_register(pp, 1, &stat, GFP_KERNEL)) 313 return 1; 314 return stat & 1; 315 } 316 317 /* 318 * Access functions. 319 */ 320 #if 0 321 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id) 322 { 323 struct parport *pp = (struct parport *)dev_id; 324 struct parport_uss720_private *priv = pp->private_data; 325 326 if (usbstatus != 0 || len < 4 || !buffer) 327 return 1; 328 memcpy(priv->reg, buffer, 4); 329 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */ 330 if (priv->reg[2] & priv->reg[1] & 0x10) 331 parport_generic_irq(pp); 332 return 1; 333 } 334 #endif 335 336 static void parport_uss720_write_data(struct parport *pp, unsigned char d) 337 { 338 set_1284_register(pp, 0, d, GFP_KERNEL); 339 } 340 341 static unsigned char parport_uss720_read_data(struct parport *pp) 342 { 343 unsigned char ret; 344 345 if (get_1284_register(pp, 0, &ret, GFP_KERNEL)) 346 return 0; 347 return ret; 348 } 349 350 static void parport_uss720_write_control(struct parport *pp, unsigned char d) 351 { 352 struct parport_uss720_private *priv = pp->private_data; 353 354 d = (d & 0xf) | (priv->reg[1] & 0xf0); 355 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 356 return; 357 priv->reg[1] = d; 358 } 359 360 static unsigned char parport_uss720_read_control(struct parport *pp) 361 { 362 struct parport_uss720_private *priv = pp->private_data; 363 return priv->reg[1] & 0xf; /* Use soft copy */ 364 } 365 366 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val) 367 { 368 struct parport_uss720_private *priv = pp->private_data; 369 unsigned char d; 370 371 mask &= 0x0f; 372 val &= 0x0f; 373 d = (priv->reg[1] & (~mask)) ^ val; 374 if (set_1284_register(pp, 2, d, GFP_ATOMIC)) 375 return 0; 376 priv->reg[1] = d; 377 return d & 0xf; 378 } 379 380 static unsigned char parport_uss720_read_status(struct parport *pp) 381 { 382 unsigned char ret; 383 384 if (get_1284_register(pp, 1, &ret, GFP_ATOMIC)) 385 return 0; 386 return ret & 0xf8; 387 } 388 389 static void parport_uss720_disable_irq(struct parport *pp) 390 { 391 struct parport_uss720_private *priv = pp->private_data; 392 unsigned char d; 393 394 d = priv->reg[1] & ~0x10; 395 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 396 return; 397 priv->reg[1] = d; 398 } 399 400 static void parport_uss720_enable_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_data_forward (struct parport *pp) 412 { 413 struct parport_uss720_private *priv = pp->private_data; 414 unsigned char d; 415 416 d = priv->reg[1] & ~0x20; 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_reverse (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_init_state(struct pardevice *dev, struct parport_state *s) 434 { 435 s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0); 436 s->u.pc.ecr = 0x24; 437 } 438 439 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s) 440 { 441 struct parport_uss720_private *priv = pp->private_data; 442 443 #if 0 444 if (get_1284_register(pp, 2, NULL, GFP_ATOMIC)) 445 return; 446 #endif 447 s->u.pc.ctr = priv->reg[1]; 448 s->u.pc.ecr = priv->reg[2]; 449 } 450 451 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s) 452 { 453 struct parport_uss720_private *priv = pp->private_data; 454 455 set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC); 456 set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC); 457 get_1284_register(pp, 2, NULL, GFP_ATOMIC); 458 priv->reg[1] = s->u.pc.ctr; 459 priv->reg[2] = s->u.pc.ecr; 460 } 461 462 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags) 463 { 464 struct parport_uss720_private *priv = pp->private_data; 465 size_t got = 0; 466 467 if (change_mode(pp, ECR_EPP)) 468 return 0; 469 for (; got < length; got++) { 470 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL)) 471 break; 472 buf++; 473 if (priv->reg[0] & 0x01) { 474 clear_epp_timeout(pp); 475 break; 476 } 477 } 478 change_mode(pp, ECR_PS2); 479 return got; 480 } 481 482 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags) 483 { 484 #if 0 485 struct parport_uss720_private *priv = pp->private_data; 486 size_t written = 0; 487 488 if (change_mode(pp, ECR_EPP)) 489 return 0; 490 for (; written < length; written++) { 491 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL)) 492 break; 493 ((char*)buf)++; 494 if (get_1284_register(pp, 1, NULL, GFP_KERNEL)) 495 break; 496 if (priv->reg[0] & 0x01) { 497 clear_epp_timeout(pp); 498 break; 499 } 500 } 501 change_mode(pp, ECR_PS2); 502 return written; 503 #else 504 struct parport_uss720_private *priv = pp->private_data; 505 struct usb_device *usbdev = priv->usbdev; 506 int rlen = 0; 507 int i; 508 509 if (!usbdev) 510 return 0; 511 if (change_mode(pp, ECR_EPP)) 512 return 0; 513 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000); 514 if (i) 515 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buf, length, rlen); 516 change_mode(pp, ECR_PS2); 517 return rlen; 518 #endif 519 } 520 521 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags) 522 { 523 struct parport_uss720_private *priv = pp->private_data; 524 size_t got = 0; 525 526 if (change_mode(pp, ECR_EPP)) 527 return 0; 528 for (; got < length; got++) { 529 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL)) 530 break; 531 buf++; 532 if (priv->reg[0] & 0x01) { 533 clear_epp_timeout(pp); 534 break; 535 } 536 } 537 change_mode(pp, ECR_PS2); 538 return got; 539 } 540 541 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags) 542 { 543 struct parport_uss720_private *priv = pp->private_data; 544 size_t written = 0; 545 546 if (change_mode(pp, ECR_EPP)) 547 return 0; 548 for (; written < length; written++) { 549 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL)) 550 break; 551 buf++; 552 if (get_1284_register(pp, 1, NULL, GFP_KERNEL)) 553 break; 554 if (priv->reg[0] & 0x01) { 555 clear_epp_timeout(pp); 556 break; 557 } 558 } 559 change_mode(pp, ECR_PS2); 560 return written; 561 } 562 563 static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags) 564 { 565 struct parport_uss720_private *priv = pp->private_data; 566 struct usb_device *usbdev = priv->usbdev; 567 int rlen = 0; 568 int i; 569 570 if (!usbdev) 571 return 0; 572 if (change_mode(pp, ECR_ECP)) 573 return 0; 574 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000); 575 if (i) 576 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen); 577 change_mode(pp, ECR_PS2); 578 return rlen; 579 } 580 581 static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags) 582 { 583 struct parport_uss720_private *priv = pp->private_data; 584 struct usb_device *usbdev = priv->usbdev; 585 int rlen = 0; 586 int i; 587 588 if (!usbdev) 589 return 0; 590 if (change_mode(pp, ECR_ECP)) 591 return 0; 592 i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000); 593 if (i) 594 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %zu rlen %u\n", buffer, len, rlen); 595 change_mode(pp, ECR_PS2); 596 return rlen; 597 } 598 599 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags) 600 { 601 size_t written = 0; 602 603 if (change_mode(pp, ECR_ECP)) 604 return 0; 605 for (; written < len; written++) { 606 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL)) 607 break; 608 buffer++; 609 } 610 change_mode(pp, ECR_PS2); 611 return written; 612 } 613 614 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags) 615 { 616 struct parport_uss720_private *priv = pp->private_data; 617 struct usb_device *usbdev = priv->usbdev; 618 int rlen = 0; 619 int i; 620 621 if (!usbdev) 622 return 0; 623 if (change_mode(pp, ECR_PPF)) 624 return 0; 625 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000); 626 if (i) 627 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen); 628 change_mode(pp, ECR_PS2); 629 return rlen; 630 } 631 632 /* --------------------------------------------------------------------- */ 633 634 static struct parport_operations parport_uss720_ops = 635 { 636 .owner = THIS_MODULE, 637 .write_data = parport_uss720_write_data, 638 .read_data = parport_uss720_read_data, 639 640 .write_control = parport_uss720_write_control, 641 .read_control = parport_uss720_read_control, 642 .frob_control = parport_uss720_frob_control, 643 644 .read_status = parport_uss720_read_status, 645 646 .enable_irq = parport_uss720_enable_irq, 647 .disable_irq = parport_uss720_disable_irq, 648 649 .data_forward = parport_uss720_data_forward, 650 .data_reverse = parport_uss720_data_reverse, 651 652 .init_state = parport_uss720_init_state, 653 .save_state = parport_uss720_save_state, 654 .restore_state = parport_uss720_restore_state, 655 656 .epp_write_data = parport_uss720_epp_write_data, 657 .epp_read_data = parport_uss720_epp_read_data, 658 .epp_write_addr = parport_uss720_epp_write_addr, 659 .epp_read_addr = parport_uss720_epp_read_addr, 660 661 .ecp_write_data = parport_uss720_ecp_write_data, 662 .ecp_read_data = parport_uss720_ecp_read_data, 663 .ecp_write_addr = parport_uss720_ecp_write_addr, 664 665 .compat_write_data = parport_uss720_write_compat, 666 .nibble_read_data = parport_ieee1284_read_nibble, 667 .byte_read_data = parport_ieee1284_read_byte, 668 }; 669 670 /* --------------------------------------------------------------------- */ 671 672 static int uss720_probe(struct usb_interface *intf, 673 const struct usb_device_id *id) 674 { 675 struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf)); 676 struct usb_host_interface *interface; 677 struct usb_endpoint_descriptor *epd; 678 struct parport_uss720_private *priv; 679 struct parport *pp; 680 unsigned char reg; 681 int ret = -ENODEV; 682 683 dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n", 684 le16_to_cpu(usbdev->descriptor.idVendor), 685 le16_to_cpu(usbdev->descriptor.idProduct)); 686 687 /* our known interfaces have 3 alternate settings */ 688 if (intf->num_altsetting != 3) 689 goto bail_out_early; 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 < 2) 697 goto bail_out_early; 698 699 /* 700 * Allocate parport interface 701 */ 702 ret = -ENOMEM; 703 priv = kzalloc_obj(struct parport_uss720_private); 704 if (!priv) 705 goto bail_out_early; 706 707 priv->pp = NULL; 708 priv->usbdev = usbdev; 709 kref_init(&priv->ref_count); 710 spin_lock_init(&priv->asynclock); 711 INIT_LIST_HEAD(&priv->asynclist); 712 pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops); 713 if (!pp) { 714 printk(KERN_WARNING "uss720: could not register parport\n"); 715 goto probe_abort; 716 } 717 718 priv->pp = pp; 719 pp->private_data = priv; 720 pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_COMPAT; 721 if (interface->desc.bNumEndpoints >= 3) 722 pp->modes |= PARPORT_MODE_ECP; 723 pp->dev = &usbdev->dev; 724 725 /* set the USS720 control register to manual mode, no ECP compression, enable all ints */ 726 set_1284_register(pp, 7, 0x00, GFP_KERNEL); 727 set_1284_register(pp, 6, 0x30, GFP_KERNEL); /* PS/2 mode */ 728 set_1284_register(pp, 2, 0x0c, GFP_KERNEL); 729 730 /* The Belkin F5U002 Rev 2 P80453-B USB parallel port adapter shares the 731 * device ID 050d:0002 with some other device that works with this 732 * driver, but it itself does not. Detect and handle the bad cable 733 * here. */ 734 ret = get_1284_register(pp, 0, ®, GFP_KERNEL); 735 dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg); 736 if (ret < 0) { 737 priv->pp = NULL; 738 parport_del_port(pp); 739 goto probe_abort; 740 } 741 742 ret = usb_find_last_int_in_endpoint(interface, &epd); 743 if (!ret) { 744 dev_dbg(&intf->dev, "epaddr %d interval %d\n", 745 epd->bEndpointAddress, epd->bInterval); 746 } 747 parport_announce_port(pp); 748 749 usb_set_intfdata(intf, pp); 750 return 0; 751 752 probe_abort: 753 kill_all_async_requests_priv(priv); 754 kref_put(&priv->ref_count, destroy_priv); 755 return -ENODEV; 756 757 bail_out_early: 758 usb_put_dev(usbdev); 759 return ret; 760 } 761 762 static void uss720_disconnect(struct usb_interface *intf) 763 { 764 struct parport *pp = usb_get_intfdata(intf); 765 struct parport_uss720_private *priv; 766 767 dev_dbg(&intf->dev, "disconnect\n"); 768 usb_set_intfdata(intf, NULL); 769 if (pp) { 770 priv = pp->private_data; 771 priv->pp = NULL; 772 dev_dbg(&intf->dev, "parport_remove_port\n"); 773 parport_remove_port(pp); 774 parport_put_port(pp); 775 kill_all_async_requests_priv(priv); 776 kref_put(&priv->ref_count, destroy_priv); 777 } 778 dev_dbg(&intf->dev, "disconnect done\n"); 779 } 780 781 /* table of cables that work through this driver */ 782 static const struct usb_device_id uss720_table[] = { 783 { USB_DEVICE(0x047e, 0x1001) }, /* Infowave 901-0030 */ 784 { USB_DEVICE(0x04b8, 0x0002) }, /* Epson CAEUL0002 ISD-103 */ 785 { USB_DEVICE(0x04b8, 0x0003) }, /* Epson ISD-101 */ 786 { USB_DEVICE(0x050d, 0x0002) }, 787 { USB_DEVICE(0x050d, 0x1202) }, /* Belkin F5U120-PC */ 788 { USB_DEVICE(0x0557, 0x2001) }, 789 { USB_DEVICE(0x05ab, 0x0002) }, /* Belkin F5U002 ISD-101 */ 790 { USB_DEVICE(0x05ab, 0x1001) }, /* Belkin F5U002 P80453-A */ 791 { USB_DEVICE(0x06c6, 0x0100) }, /* Infowave ISD-103 */ 792 { USB_DEVICE(0x0729, 0x1284) }, 793 { USB_DEVICE(0x1293, 0x0002) }, 794 { } /* Terminating entry */ 795 }; 796 797 MODULE_DEVICE_TABLE (usb, uss720_table); 798 799 800 static struct usb_driver uss720_driver = { 801 .name = "uss720", 802 .probe = uss720_probe, 803 .disconnect = uss720_disconnect, 804 .id_table = uss720_table, 805 }; 806 807 /* --------------------------------------------------------------------- */ 808 809 MODULE_AUTHOR(DRIVER_AUTHOR); 810 MODULE_DESCRIPTION(DRIVER_DESC); 811 MODULE_LICENSE("GPL"); 812 813 static int __init uss720_init(void) 814 { 815 int retval; 816 retval = usb_register(&uss720_driver); 817 if (retval) 818 goto out; 819 820 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n"); 821 printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose " 822 "driver to allow nonstandard\n"); 823 printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over " 824 "USS720 usb to parallel cables\n"); 825 printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a " 826 "printer, use usblp instead\n"); 827 out: 828 return retval; 829 } 830 831 static void __exit uss720_cleanup(void) 832 { 833 usb_deregister(&uss720_driver); 834 } 835 836 module_init(uss720_init); 837 module_exit(uss720_cleanup); 838 839 /* --------------------------------------------------------------------- */ 840