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 kfree(priv); 75 } 76 77 static void destroy_async(struct kref *kref) 78 { 79 struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count); 80 struct parport_uss720_private *priv = rq->priv; 81 unsigned long flags; 82 83 if (likely(rq->urb)) 84 usb_free_urb(rq->urb); 85 kfree(rq->dr); 86 spin_lock_irqsave(&priv->asynclock, flags); 87 list_del_init(&rq->asynclist); 88 spin_unlock_irqrestore(&priv->asynclock, flags); 89 kfree(rq); 90 kref_put(&priv->ref_count, destroy_priv); 91 } 92 93 /* --------------------------------------------------------------------- */ 94 95 static void async_complete(struct urb *urb) 96 { 97 struct uss720_async_request *rq; 98 struct parport *pp; 99 struct parport_uss720_private *priv; 100 int status = urb->status; 101 102 rq = urb->context; 103 priv = rq->priv; 104 pp = priv->pp; 105 if (status) { 106 dev_err(&urb->dev->dev, "async_complete: urb error %d\n", 107 status); 108 } else if (rq->dr->bRequest == 3) { 109 memcpy(priv->reg, rq->reg, sizeof(priv->reg)); 110 #if 0 111 dev_dbg(&priv->usbdev->dev, "async_complete regs %7ph\n", 112 priv->reg); 113 #endif 114 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */ 115 if (rq->reg[2] & rq->reg[1] & 0x10 && pp) 116 parport_generic_irq(pp); 117 } 118 complete(&rq->compl); 119 kref_put(&rq->ref_count, destroy_async); 120 } 121 122 static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv, 123 __u8 request, __u8 requesttype, __u16 value, __u16 index, 124 gfp_t mem_flags) 125 { 126 struct usb_device *usbdev; 127 struct uss720_async_request *rq; 128 unsigned long flags; 129 int ret; 130 131 if (!priv) 132 return NULL; 133 usbdev = priv->usbdev; 134 if (!usbdev) 135 return NULL; 136 rq = kzalloc(sizeof(struct uss720_async_request), mem_flags); 137 if (!rq) 138 return NULL; 139 kref_init(&rq->ref_count); 140 INIT_LIST_HEAD(&rq->asynclist); 141 init_completion(&rq->compl); 142 kref_get(&priv->ref_count); 143 rq->priv = priv; 144 rq->urb = usb_alloc_urb(0, mem_flags); 145 if (!rq->urb) { 146 kref_put(&rq->ref_count, destroy_async); 147 return NULL; 148 } 149 rq->dr = kmalloc(sizeof(*rq->dr), mem_flags); 150 if (!rq->dr) { 151 kref_put(&rq->ref_count, destroy_async); 152 return NULL; 153 } 154 rq->dr->bRequestType = requesttype; 155 rq->dr->bRequest = request; 156 rq->dr->wValue = cpu_to_le16(value); 157 rq->dr->wIndex = cpu_to_le16(index); 158 rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0); 159 usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0), 160 (unsigned char *)rq->dr, 161 (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq); 162 /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */ 163 spin_lock_irqsave(&priv->asynclock, flags); 164 list_add_tail(&rq->asynclist, &priv->asynclist); 165 spin_unlock_irqrestore(&priv->asynclock, flags); 166 kref_get(&rq->ref_count); 167 ret = usb_submit_urb(rq->urb, mem_flags); 168 if (!ret) 169 return rq; 170 destroy_async(&rq->ref_count); 171 dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret); 172 return NULL; 173 } 174 175 static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv) 176 { 177 struct uss720_async_request *rq; 178 unsigned long flags; 179 unsigned int ret = 0; 180 181 spin_lock_irqsave(&priv->asynclock, flags); 182 list_for_each_entry(rq, &priv->asynclist, asynclist) { 183 usb_unlink_urb(rq->urb); 184 ret++; 185 } 186 spin_unlock_irqrestore(&priv->asynclock, flags); 187 return ret; 188 } 189 190 /* --------------------------------------------------------------------- */ 191 192 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags) 193 { 194 struct parport_uss720_private *priv; 195 struct uss720_async_request *rq; 196 static const unsigned char regindex[9] = { 197 4, 0, 1, 5, 5, 0, 2, 3, 6 198 }; 199 int ret; 200 201 if (!pp) 202 return -EIO; 203 priv = pp->private_data; 204 rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags); 205 if (!rq) { 206 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed", 207 (unsigned int)reg); 208 return -EIO; 209 } 210 if (!val) { 211 kref_put(&rq->ref_count, destroy_async); 212 return 0; 213 } 214 if (wait_for_completion_timeout(&rq->compl, HZ)) { 215 ret = rq->urb->status; 216 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]]; 217 if (ret) 218 printk(KERN_WARNING "get_1284_register: " 219 "usb error %d\n", ret); 220 kref_put(&rq->ref_count, destroy_async); 221 return ret; 222 } 223 printk(KERN_WARNING "get_1284_register timeout\n"); 224 kill_all_async_requests_priv(priv); 225 return -EIO; 226 } 227 228 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags) 229 { 230 struct parport_uss720_private *priv; 231 struct uss720_async_request *rq; 232 233 if (!pp) 234 return -EIO; 235 priv = pp->private_data; 236 rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags); 237 if (!rq) { 238 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed", 239 (unsigned int)reg, (unsigned int)val); 240 return -EIO; 241 } 242 kref_put(&rq->ref_count, destroy_async); 243 return 0; 244 } 245 246 /* --------------------------------------------------------------------- */ 247 248 /* ECR modes */ 249 #define ECR_SPP 00 250 #define ECR_PS2 01 251 #define ECR_PPF 02 252 #define ECR_ECP 03 253 #define ECR_EPP 04 254 255 /* Safely change the mode bits in the ECR */ 256 static int change_mode(struct parport *pp, int m) 257 { 258 struct parport_uss720_private *priv = pp->private_data; 259 int mode; 260 __u8 reg; 261 262 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 263 return -EIO; 264 /* Bits <7:5> contain the mode. */ 265 mode = (priv->reg[2] >> 5) & 0x7; 266 if (mode == m) 267 return 0; 268 /* We have to go through mode 000 or 001 */ 269 if (mode > ECR_PS2 && m > ECR_PS2) 270 if (change_mode(pp, ECR_PS2)) 271 return -EIO; 272 273 if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) { 274 /* This mode resets the FIFO, so we may 275 * have to wait for it to drain first. */ 276 unsigned long expire = jiffies + pp->physport->cad->timeout; 277 switch (mode) { 278 case ECR_PPF: /* Parallel Port FIFO mode */ 279 case ECR_ECP: /* ECP Parallel Port mode */ 280 /* Poll slowly. */ 281 for (;;) { 282 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 283 return -EIO; 284 if (priv->reg[2] & 0x01) 285 break; 286 if (time_after_eq (jiffies, expire)) 287 /* The FIFO is stuck. */ 288 return -EBUSY; 289 msleep_interruptible(10); 290 if (signal_pending (current)) 291 break; 292 } 293 } 294 } 295 /* Set the mode. */ 296 if (set_1284_register(pp, 6, m << 5, GFP_KERNEL)) 297 return -EIO; 298 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 299 return -EIO; 300 return 0; 301 } 302 303 /* 304 * Clear TIMEOUT BIT in EPP MODE 305 */ 306 static int clear_epp_timeout(struct parport *pp) 307 { 308 unsigned char stat; 309 310 if (get_1284_register(pp, 1, &stat, GFP_KERNEL)) 311 return 1; 312 return stat & 1; 313 } 314 315 /* 316 * Access functions. 317 */ 318 #if 0 319 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id) 320 { 321 struct parport *pp = (struct parport *)dev_id; 322 struct parport_uss720_private *priv = pp->private_data; 323 324 if (usbstatus != 0 || len < 4 || !buffer) 325 return 1; 326 memcpy(priv->reg, buffer, 4); 327 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */ 328 if (priv->reg[2] & priv->reg[1] & 0x10) 329 parport_generic_irq(pp); 330 return 1; 331 } 332 #endif 333 334 static void parport_uss720_write_data(struct parport *pp, unsigned char d) 335 { 336 set_1284_register(pp, 0, d, GFP_KERNEL); 337 } 338 339 static unsigned char parport_uss720_read_data(struct parport *pp) 340 { 341 unsigned char ret; 342 343 if (get_1284_register(pp, 0, &ret, GFP_KERNEL)) 344 return 0; 345 return ret; 346 } 347 348 static void parport_uss720_write_control(struct parport *pp, unsigned char d) 349 { 350 struct parport_uss720_private *priv = pp->private_data; 351 352 d = (d & 0xf) | (priv->reg[1] & 0xf0); 353 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 354 return; 355 priv->reg[1] = d; 356 } 357 358 static unsigned char parport_uss720_read_control(struct parport *pp) 359 { 360 struct parport_uss720_private *priv = pp->private_data; 361 return priv->reg[1] & 0xf; /* Use soft copy */ 362 } 363 364 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val) 365 { 366 struct parport_uss720_private *priv = pp->private_data; 367 unsigned char d; 368 369 mask &= 0x0f; 370 val &= 0x0f; 371 d = (priv->reg[1] & (~mask)) ^ val; 372 if (set_1284_register(pp, 2, d, GFP_ATOMIC)) 373 return 0; 374 priv->reg[1] = d; 375 return d & 0xf; 376 } 377 378 static unsigned char parport_uss720_read_status(struct parport *pp) 379 { 380 unsigned char ret; 381 382 if (get_1284_register(pp, 1, &ret, GFP_ATOMIC)) 383 return 0; 384 return ret & 0xf8; 385 } 386 387 static void parport_uss720_disable_irq(struct parport *pp) 388 { 389 struct parport_uss720_private *priv = pp->private_data; 390 unsigned char d; 391 392 d = priv->reg[1] & ~0x10; 393 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 394 return; 395 priv->reg[1] = d; 396 } 397 398 static void parport_uss720_enable_irq(struct parport *pp) 399 { 400 struct parport_uss720_private *priv = pp->private_data; 401 unsigned char d; 402 403 d = priv->reg[1] | 0x10; 404 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 405 return; 406 priv->reg[1] = d; 407 } 408 409 static void parport_uss720_data_forward (struct parport *pp) 410 { 411 struct parport_uss720_private *priv = pp->private_data; 412 unsigned char d; 413 414 d = priv->reg[1] & ~0x20; 415 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 416 return; 417 priv->reg[1] = d; 418 } 419 420 static void parport_uss720_data_reverse (struct parport *pp) 421 { 422 struct parport_uss720_private *priv = pp->private_data; 423 unsigned char d; 424 425 d = priv->reg[1] | 0x20; 426 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 427 return; 428 priv->reg[1] = d; 429 } 430 431 static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s) 432 { 433 s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0); 434 s->u.pc.ecr = 0x24; 435 } 436 437 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s) 438 { 439 struct parport_uss720_private *priv = pp->private_data; 440 441 #if 0 442 if (get_1284_register(pp, 2, NULL, GFP_ATOMIC)) 443 return; 444 #endif 445 s->u.pc.ctr = priv->reg[1]; 446 s->u.pc.ecr = priv->reg[2]; 447 } 448 449 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s) 450 { 451 struct parport_uss720_private *priv = pp->private_data; 452 453 set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC); 454 set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC); 455 get_1284_register(pp, 2, NULL, GFP_ATOMIC); 456 priv->reg[1] = s->u.pc.ctr; 457 priv->reg[2] = s->u.pc.ecr; 458 } 459 460 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags) 461 { 462 struct parport_uss720_private *priv = pp->private_data; 463 size_t got = 0; 464 465 if (change_mode(pp, ECR_EPP)) 466 return 0; 467 for (; got < length; got++) { 468 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL)) 469 break; 470 buf++; 471 if (priv->reg[0] & 0x01) { 472 clear_epp_timeout(pp); 473 break; 474 } 475 } 476 change_mode(pp, ECR_PS2); 477 return got; 478 } 479 480 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags) 481 { 482 #if 0 483 struct parport_uss720_private *priv = pp->private_data; 484 size_t written = 0; 485 486 if (change_mode(pp, ECR_EPP)) 487 return 0; 488 for (; written < length; written++) { 489 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL)) 490 break; 491 ((char*)buf)++; 492 if (get_1284_register(pp, 1, NULL, GFP_KERNEL)) 493 break; 494 if (priv->reg[0] & 0x01) { 495 clear_epp_timeout(pp); 496 break; 497 } 498 } 499 change_mode(pp, ECR_PS2); 500 return written; 501 #else 502 struct parport_uss720_private *priv = pp->private_data; 503 struct usb_device *usbdev = priv->usbdev; 504 int rlen; 505 int i; 506 507 if (!usbdev) 508 return 0; 509 if (change_mode(pp, ECR_EPP)) 510 return 0; 511 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000); 512 if (i) 513 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buf, length, rlen); 514 change_mode(pp, ECR_PS2); 515 return rlen; 516 #endif 517 } 518 519 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags) 520 { 521 struct parport_uss720_private *priv = pp->private_data; 522 size_t got = 0; 523 524 if (change_mode(pp, ECR_EPP)) 525 return 0; 526 for (; got < length; got++) { 527 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL)) 528 break; 529 buf++; 530 if (priv->reg[0] & 0x01) { 531 clear_epp_timeout(pp); 532 break; 533 } 534 } 535 change_mode(pp, ECR_PS2); 536 return got; 537 } 538 539 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags) 540 { 541 struct parport_uss720_private *priv = pp->private_data; 542 size_t written = 0; 543 544 if (change_mode(pp, ECR_EPP)) 545 return 0; 546 for (; written < length; written++) { 547 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL)) 548 break; 549 buf++; 550 if (get_1284_register(pp, 1, NULL, GFP_KERNEL)) 551 break; 552 if (priv->reg[0] & 0x01) { 553 clear_epp_timeout(pp); 554 break; 555 } 556 } 557 change_mode(pp, ECR_PS2); 558 return written; 559 } 560 561 static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags) 562 { 563 struct parport_uss720_private *priv = pp->private_data; 564 struct usb_device *usbdev = priv->usbdev; 565 int rlen; 566 int i; 567 568 if (!usbdev) 569 return 0; 570 if (change_mode(pp, ECR_ECP)) 571 return 0; 572 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000); 573 if (i) 574 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen); 575 change_mode(pp, ECR_PS2); 576 return rlen; 577 } 578 579 static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags) 580 { 581 struct parport_uss720_private *priv = pp->private_data; 582 struct usb_device *usbdev = priv->usbdev; 583 int rlen; 584 int i; 585 586 if (!usbdev) 587 return 0; 588 if (change_mode(pp, ECR_ECP)) 589 return 0; 590 i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000); 591 if (i) 592 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %zu rlen %u\n", buffer, len, rlen); 593 change_mode(pp, ECR_PS2); 594 return rlen; 595 } 596 597 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags) 598 { 599 size_t written = 0; 600 601 if (change_mode(pp, ECR_ECP)) 602 return 0; 603 for (; written < len; written++) { 604 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL)) 605 break; 606 buffer++; 607 } 608 change_mode(pp, ECR_PS2); 609 return written; 610 } 611 612 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags) 613 { 614 struct parport_uss720_private *priv = pp->private_data; 615 struct usb_device *usbdev = priv->usbdev; 616 int rlen; 617 int i; 618 619 if (!usbdev) 620 return 0; 621 if (change_mode(pp, ECR_PPF)) 622 return 0; 623 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000); 624 if (i) 625 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen); 626 change_mode(pp, ECR_PS2); 627 return rlen; 628 } 629 630 /* --------------------------------------------------------------------- */ 631 632 static struct parport_operations parport_uss720_ops = 633 { 634 .owner = THIS_MODULE, 635 .write_data = parport_uss720_write_data, 636 .read_data = parport_uss720_read_data, 637 638 .write_control = parport_uss720_write_control, 639 .read_control = parport_uss720_read_control, 640 .frob_control = parport_uss720_frob_control, 641 642 .read_status = parport_uss720_read_status, 643 644 .enable_irq = parport_uss720_enable_irq, 645 .disable_irq = parport_uss720_disable_irq, 646 647 .data_forward = parport_uss720_data_forward, 648 .data_reverse = parport_uss720_data_reverse, 649 650 .init_state = parport_uss720_init_state, 651 .save_state = parport_uss720_save_state, 652 .restore_state = parport_uss720_restore_state, 653 654 .epp_write_data = parport_uss720_epp_write_data, 655 .epp_read_data = parport_uss720_epp_read_data, 656 .epp_write_addr = parport_uss720_epp_write_addr, 657 .epp_read_addr = parport_uss720_epp_read_addr, 658 659 .ecp_write_data = parport_uss720_ecp_write_data, 660 .ecp_read_data = parport_uss720_ecp_read_data, 661 .ecp_write_addr = parport_uss720_ecp_write_addr, 662 663 .compat_write_data = parport_uss720_write_compat, 664 .nibble_read_data = parport_ieee1284_read_nibble, 665 .byte_read_data = parport_ieee1284_read_byte, 666 }; 667 668 /* --------------------------------------------------------------------- */ 669 670 static int uss720_probe(struct usb_interface *intf, 671 const struct usb_device_id *id) 672 { 673 struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf)); 674 struct usb_host_interface *interface; 675 struct usb_endpoint_descriptor *epd; 676 struct parport_uss720_private *priv; 677 struct parport *pp; 678 unsigned char reg; 679 int i; 680 681 dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n", 682 le16_to_cpu(usbdev->descriptor.idVendor), 683 le16_to_cpu(usbdev->descriptor.idProduct)); 684 685 /* our known interfaces have 3 alternate settings */ 686 if (intf->num_altsetting != 3) { 687 usb_put_dev(usbdev); 688 return -ENODEV; 689 } 690 i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2); 691 dev_dbg(&intf->dev, "set interface result %d\n", i); 692 693 interface = intf->cur_altsetting; 694 695 if (interface->desc.bNumEndpoints < 3) { 696 usb_put_dev(usbdev); 697 return -ENODEV; 698 } 699 700 /* 701 * Allocate parport interface 702 */ 703 priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL); 704 if (!priv) { 705 usb_put_dev(usbdev); 706 return -ENOMEM; 707 } 708 priv->pp = NULL; 709 priv->usbdev = usbdev; 710 kref_init(&priv->ref_count); 711 spin_lock_init(&priv->asynclock); 712 INIT_LIST_HEAD(&priv->asynclist); 713 pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops); 714 if (!pp) { 715 printk(KERN_WARNING "uss720: could not register parport\n"); 716 goto probe_abort; 717 } 718 719 priv->pp = pp; 720 pp->private_data = priv; 721 pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT; 722 723 /* set the USS720 control register to manual mode, no ECP compression, enable all ints */ 724 set_1284_register(pp, 7, 0x00, GFP_KERNEL); 725 set_1284_register(pp, 6, 0x30, GFP_KERNEL); /* PS/2 mode */ 726 set_1284_register(pp, 2, 0x0c, GFP_KERNEL); 727 /* debugging */ 728 get_1284_register(pp, 0, ®, GFP_KERNEL); 729 dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg); 730 731 i = usb_find_last_int_in_endpoint(interface, &epd); 732 if (!i) { 733 dev_dbg(&intf->dev, "epaddr %d interval %d\n", 734 epd->bEndpointAddress, epd->bInterval); 735 } 736 parport_announce_port(pp); 737 738 usb_set_intfdata(intf, pp); 739 return 0; 740 741 probe_abort: 742 kill_all_async_requests_priv(priv); 743 kref_put(&priv->ref_count, destroy_priv); 744 return -ENODEV; 745 } 746 747 static void uss720_disconnect(struct usb_interface *intf) 748 { 749 struct parport *pp = usb_get_intfdata(intf); 750 struct parport_uss720_private *priv; 751 752 dev_dbg(&intf->dev, "disconnect\n"); 753 usb_set_intfdata(intf, NULL); 754 if (pp) { 755 priv = pp->private_data; 756 priv->usbdev = NULL; 757 priv->pp = NULL; 758 dev_dbg(&intf->dev, "parport_remove_port\n"); 759 parport_remove_port(pp); 760 parport_put_port(pp); 761 kill_all_async_requests_priv(priv); 762 kref_put(&priv->ref_count, destroy_priv); 763 } 764 dev_dbg(&intf->dev, "disconnect done\n"); 765 } 766 767 /* table of cables that work through this driver */ 768 static const struct usb_device_id uss720_table[] = { 769 { USB_DEVICE(0x047e, 0x1001) }, 770 { USB_DEVICE(0x04b8, 0x0002) }, 771 { USB_DEVICE(0x04b8, 0x0003) }, 772 { USB_DEVICE(0x050d, 0x0002) }, 773 { USB_DEVICE(0x050d, 0x1202) }, 774 { USB_DEVICE(0x0557, 0x2001) }, 775 { USB_DEVICE(0x05ab, 0x0002) }, 776 { USB_DEVICE(0x06c6, 0x0100) }, 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_DESC "\n"); 806 printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose " 807 "driver to allow nonstandard\n"); 808 printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over " 809 "USS720 usb to parallel cables\n"); 810 printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a " 811 "printer, use usblp instead\n"); 812 out: 813 return retval; 814 } 815 816 static void __exit uss720_cleanup(void) 817 { 818 usb_deregister(&uss720_driver); 819 } 820 821 module_init(uss720_init); 822 module_exit(uss720_cleanup); 823 824 /* --------------------------------------------------------------------- */ 825