1 /*****************************************************************************/ 2 3 /* 4 * uss720.c -- USS720 USB Parport Cable. 5 * 6 * Copyright (C) 1999, 2005, 2010 7 * Thomas Sailer (t.sailer@alumni.ethz.ch) 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 * 23 * Based on parport_pc.c 24 * 25 * History: 26 * 0.1 04.08.1999 Created 27 * 0.2 07.08.1999 Some fixes mainly suggested by Tim Waugh 28 * Interrupt handling currently disabled because 29 * usb_request_irq crashes somewhere within ohci.c 30 * for no apparent reason (that is for me, anyway) 31 * ECP currently untested 32 * 0.3 10.08.1999 fixing merge errors 33 * 0.4 13.08.1999 Added Vendor/Product ID of Brad Hard's cable 34 * 0.5 20.09.1999 usb_control_msg wrapper used 35 * Nov01.2000 usb_device_table support by Adam J. Richter 36 * 08.04.2001 Identify version on module load. gb 37 * 0.6 02.09.2005 Fix "scheduling in interrupt" problem by making save/restore 38 * context asynchronous 39 * 40 */ 41 42 /*****************************************************************************/ 43 44 #include <linux/module.h> 45 #include <linux/socket.h> 46 #include <linux/parport.h> 47 #include <linux/init.h> 48 #include <linux/usb.h> 49 #include <linux/delay.h> 50 #include <linux/completion.h> 51 #include <linux/kref.h> 52 #include <linux/slab.h> 53 #include <linux/sched/signal.h> 54 55 /* 56 * Version Information 57 */ 58 #define DRIVER_VERSION "v0.6" 59 #define DRIVER_AUTHOR "Thomas M. Sailer, t.sailer@alumni.ethz.ch" 60 #define DRIVER_DESC "USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip" 61 62 /* --------------------------------------------------------------------- */ 63 64 struct parport_uss720_private { 65 struct usb_device *usbdev; 66 struct parport *pp; 67 struct kref ref_count; 68 __u8 reg[7]; /* USB registers */ 69 struct list_head asynclist; 70 spinlock_t asynclock; 71 }; 72 73 struct uss720_async_request { 74 struct parport_uss720_private *priv; 75 struct kref ref_count; 76 struct list_head asynclist; 77 struct completion compl; 78 struct urb *urb; 79 struct usb_ctrlrequest *dr; 80 __u8 reg[7]; 81 }; 82 83 /* --------------------------------------------------------------------- */ 84 85 static void destroy_priv(struct kref *kref) 86 { 87 struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count); 88 89 dev_dbg(&priv->usbdev->dev, "destroying priv datastructure\n"); 90 usb_put_dev(priv->usbdev); 91 kfree(priv); 92 } 93 94 static void destroy_async(struct kref *kref) 95 { 96 struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count); 97 struct parport_uss720_private *priv = rq->priv; 98 unsigned long flags; 99 100 if (likely(rq->urb)) 101 usb_free_urb(rq->urb); 102 kfree(rq->dr); 103 spin_lock_irqsave(&priv->asynclock, flags); 104 list_del_init(&rq->asynclist); 105 spin_unlock_irqrestore(&priv->asynclock, flags); 106 kfree(rq); 107 kref_put(&priv->ref_count, destroy_priv); 108 } 109 110 /* --------------------------------------------------------------------- */ 111 112 static void async_complete(struct urb *urb) 113 { 114 struct uss720_async_request *rq; 115 struct parport *pp; 116 struct parport_uss720_private *priv; 117 int status = urb->status; 118 119 rq = urb->context; 120 priv = rq->priv; 121 pp = priv->pp; 122 if (status) { 123 dev_err(&urb->dev->dev, "async_complete: urb error %d\n", 124 status); 125 } else if (rq->dr->bRequest == 3) { 126 memcpy(priv->reg, rq->reg, sizeof(priv->reg)); 127 #if 0 128 dev_dbg(&priv->usbdev->dev, "async_complete regs %7ph\n", 129 priv->reg); 130 #endif 131 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */ 132 if (rq->reg[2] & rq->reg[1] & 0x10 && pp) 133 parport_generic_irq(pp); 134 } 135 complete(&rq->compl); 136 kref_put(&rq->ref_count, destroy_async); 137 } 138 139 static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv, 140 __u8 request, __u8 requesttype, __u16 value, __u16 index, 141 gfp_t mem_flags) 142 { 143 struct usb_device *usbdev; 144 struct uss720_async_request *rq; 145 unsigned long flags; 146 int ret; 147 148 if (!priv) 149 return NULL; 150 usbdev = priv->usbdev; 151 if (!usbdev) 152 return NULL; 153 rq = kzalloc(sizeof(struct uss720_async_request), mem_flags); 154 if (!rq) 155 return NULL; 156 kref_init(&rq->ref_count); 157 INIT_LIST_HEAD(&rq->asynclist); 158 init_completion(&rq->compl); 159 kref_get(&priv->ref_count); 160 rq->priv = priv; 161 rq->urb = usb_alloc_urb(0, mem_flags); 162 if (!rq->urb) { 163 kref_put(&rq->ref_count, destroy_async); 164 return NULL; 165 } 166 rq->dr = kmalloc(sizeof(*rq->dr), mem_flags); 167 if (!rq->dr) { 168 kref_put(&rq->ref_count, destroy_async); 169 return NULL; 170 } 171 rq->dr->bRequestType = requesttype; 172 rq->dr->bRequest = request; 173 rq->dr->wValue = cpu_to_le16(value); 174 rq->dr->wIndex = cpu_to_le16(index); 175 rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0); 176 usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0), 177 (unsigned char *)rq->dr, 178 (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq); 179 /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */ 180 spin_lock_irqsave(&priv->asynclock, flags); 181 list_add_tail(&rq->asynclist, &priv->asynclist); 182 spin_unlock_irqrestore(&priv->asynclock, flags); 183 kref_get(&rq->ref_count); 184 ret = usb_submit_urb(rq->urb, mem_flags); 185 if (!ret) 186 return rq; 187 destroy_async(&rq->ref_count); 188 dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret); 189 return NULL; 190 } 191 192 static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv) 193 { 194 struct uss720_async_request *rq; 195 unsigned long flags; 196 unsigned int ret = 0; 197 198 spin_lock_irqsave(&priv->asynclock, flags); 199 list_for_each_entry(rq, &priv->asynclist, asynclist) { 200 usb_unlink_urb(rq->urb); 201 ret++; 202 } 203 spin_unlock_irqrestore(&priv->asynclock, flags); 204 return ret; 205 } 206 207 /* --------------------------------------------------------------------- */ 208 209 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags) 210 { 211 struct parport_uss720_private *priv; 212 struct uss720_async_request *rq; 213 static const unsigned char regindex[9] = { 214 4, 0, 1, 5, 5, 0, 2, 3, 6 215 }; 216 int ret; 217 218 if (!pp) 219 return -EIO; 220 priv = pp->private_data; 221 rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags); 222 if (!rq) { 223 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed", 224 (unsigned int)reg); 225 return -EIO; 226 } 227 if (!val) { 228 kref_put(&rq->ref_count, destroy_async); 229 return 0; 230 } 231 if (wait_for_completion_timeout(&rq->compl, HZ)) { 232 ret = rq->urb->status; 233 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]]; 234 if (ret) 235 printk(KERN_WARNING "get_1284_register: " 236 "usb error %d\n", ret); 237 kref_put(&rq->ref_count, destroy_async); 238 return ret; 239 } 240 printk(KERN_WARNING "get_1284_register timeout\n"); 241 kill_all_async_requests_priv(priv); 242 return -EIO; 243 } 244 245 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags) 246 { 247 struct parport_uss720_private *priv; 248 struct uss720_async_request *rq; 249 250 if (!pp) 251 return -EIO; 252 priv = pp->private_data; 253 rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags); 254 if (!rq) { 255 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed", 256 (unsigned int)reg, (unsigned int)val); 257 return -EIO; 258 } 259 kref_put(&rq->ref_count, destroy_async); 260 return 0; 261 } 262 263 /* --------------------------------------------------------------------- */ 264 265 /* ECR modes */ 266 #define ECR_SPP 00 267 #define ECR_PS2 01 268 #define ECR_PPF 02 269 #define ECR_ECP 03 270 #define ECR_EPP 04 271 272 /* Safely change the mode bits in the ECR */ 273 static int change_mode(struct parport *pp, int m) 274 { 275 struct parport_uss720_private *priv = pp->private_data; 276 int mode; 277 __u8 reg; 278 279 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 280 return -EIO; 281 /* Bits <7:5> contain the mode. */ 282 mode = (priv->reg[2] >> 5) & 0x7; 283 if (mode == m) 284 return 0; 285 /* We have to go through mode 000 or 001 */ 286 if (mode > ECR_PS2 && m > ECR_PS2) 287 if (change_mode(pp, ECR_PS2)) 288 return -EIO; 289 290 if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) { 291 /* This mode resets the FIFO, so we may 292 * have to wait for it to drain first. */ 293 unsigned long expire = jiffies + pp->physport->cad->timeout; 294 switch (mode) { 295 case ECR_PPF: /* Parallel Port FIFO mode */ 296 case ECR_ECP: /* ECP Parallel Port mode */ 297 /* Poll slowly. */ 298 for (;;) { 299 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 300 return -EIO; 301 if (priv->reg[2] & 0x01) 302 break; 303 if (time_after_eq (jiffies, expire)) 304 /* The FIFO is stuck. */ 305 return -EBUSY; 306 msleep_interruptible(10); 307 if (signal_pending (current)) 308 break; 309 } 310 } 311 } 312 /* Set the mode. */ 313 if (set_1284_register(pp, 6, m << 5, GFP_KERNEL)) 314 return -EIO; 315 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 316 return -EIO; 317 return 0; 318 } 319 320 /* 321 * Clear TIMEOUT BIT in EPP MODE 322 */ 323 static int clear_epp_timeout(struct parport *pp) 324 { 325 unsigned char stat; 326 327 if (get_1284_register(pp, 1, &stat, GFP_KERNEL)) 328 return 1; 329 return stat & 1; 330 } 331 332 /* 333 * Access functions. 334 */ 335 #if 0 336 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id) 337 { 338 struct parport *pp = (struct parport *)dev_id; 339 struct parport_uss720_private *priv = pp->private_data; 340 341 if (usbstatus != 0 || len < 4 || !buffer) 342 return 1; 343 memcpy(priv->reg, buffer, 4); 344 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */ 345 if (priv->reg[2] & priv->reg[1] & 0x10) 346 parport_generic_irq(pp); 347 return 1; 348 } 349 #endif 350 351 static void parport_uss720_write_data(struct parport *pp, unsigned char d) 352 { 353 set_1284_register(pp, 0, d, GFP_KERNEL); 354 } 355 356 static unsigned char parport_uss720_read_data(struct parport *pp) 357 { 358 unsigned char ret; 359 360 if (get_1284_register(pp, 0, &ret, GFP_KERNEL)) 361 return 0; 362 return ret; 363 } 364 365 static void parport_uss720_write_control(struct parport *pp, unsigned char d) 366 { 367 struct parport_uss720_private *priv = pp->private_data; 368 369 d = (d & 0xf) | (priv->reg[1] & 0xf0); 370 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 371 return; 372 priv->reg[1] = d; 373 } 374 375 static unsigned char parport_uss720_read_control(struct parport *pp) 376 { 377 struct parport_uss720_private *priv = pp->private_data; 378 return priv->reg[1] & 0xf; /* Use soft copy */ 379 } 380 381 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val) 382 { 383 struct parport_uss720_private *priv = pp->private_data; 384 unsigned char d; 385 386 mask &= 0x0f; 387 val &= 0x0f; 388 d = (priv->reg[1] & (~mask)) ^ val; 389 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 390 return 0; 391 priv->reg[1] = d; 392 return d & 0xf; 393 } 394 395 static unsigned char parport_uss720_read_status(struct parport *pp) 396 { 397 unsigned char ret; 398 399 if (get_1284_register(pp, 1, &ret, GFP_KERNEL)) 400 return 0; 401 return ret & 0xf8; 402 } 403 404 static void parport_uss720_disable_irq(struct parport *pp) 405 { 406 struct parport_uss720_private *priv = pp->private_data; 407 unsigned char d; 408 409 d = priv->reg[1] & ~0x10; 410 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 411 return; 412 priv->reg[1] = d; 413 } 414 415 static void parport_uss720_enable_irq(struct parport *pp) 416 { 417 struct parport_uss720_private *priv = pp->private_data; 418 unsigned char d; 419 420 d = priv->reg[1] | 0x10; 421 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 422 return; 423 priv->reg[1] = d; 424 } 425 426 static void parport_uss720_data_forward (struct parport *pp) 427 { 428 struct parport_uss720_private *priv = pp->private_data; 429 unsigned char d; 430 431 d = priv->reg[1] & ~0x20; 432 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 433 return; 434 priv->reg[1] = d; 435 } 436 437 static void parport_uss720_data_reverse (struct parport *pp) 438 { 439 struct parport_uss720_private *priv = pp->private_data; 440 unsigned char d; 441 442 d = priv->reg[1] | 0x20; 443 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 444 return; 445 priv->reg[1] = d; 446 } 447 448 static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s) 449 { 450 s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0); 451 s->u.pc.ecr = 0x24; 452 } 453 454 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s) 455 { 456 struct parport_uss720_private *priv = pp->private_data; 457 458 #if 0 459 if (get_1284_register(pp, 2, NULL, GFP_ATOMIC)) 460 return; 461 #endif 462 s->u.pc.ctr = priv->reg[1]; 463 s->u.pc.ecr = priv->reg[2]; 464 } 465 466 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s) 467 { 468 struct parport_uss720_private *priv = pp->private_data; 469 470 set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC); 471 set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC); 472 get_1284_register(pp, 2, NULL, GFP_ATOMIC); 473 priv->reg[1] = s->u.pc.ctr; 474 priv->reg[2] = s->u.pc.ecr; 475 } 476 477 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags) 478 { 479 struct parport_uss720_private *priv = pp->private_data; 480 size_t got = 0; 481 482 if (change_mode(pp, ECR_EPP)) 483 return 0; 484 for (; got < length; got++) { 485 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL)) 486 break; 487 buf++; 488 if (priv->reg[0] & 0x01) { 489 clear_epp_timeout(pp); 490 break; 491 } 492 } 493 change_mode(pp, ECR_PS2); 494 return got; 495 } 496 497 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags) 498 { 499 #if 0 500 struct parport_uss720_private *priv = pp->private_data; 501 size_t written = 0; 502 503 if (change_mode(pp, ECR_EPP)) 504 return 0; 505 for (; written < length; written++) { 506 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL)) 507 break; 508 ((char*)buf)++; 509 if (get_1284_register(pp, 1, NULL, GFP_KERNEL)) 510 break; 511 if (priv->reg[0] & 0x01) { 512 clear_epp_timeout(pp); 513 break; 514 } 515 } 516 change_mode(pp, ECR_PS2); 517 return written; 518 #else 519 struct parport_uss720_private *priv = pp->private_data; 520 struct usb_device *usbdev = priv->usbdev; 521 int rlen; 522 int i; 523 524 if (!usbdev) 525 return 0; 526 if (change_mode(pp, ECR_EPP)) 527 return 0; 528 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000); 529 if (i) 530 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buf, length, rlen); 531 change_mode(pp, ECR_PS2); 532 return rlen; 533 #endif 534 } 535 536 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags) 537 { 538 struct parport_uss720_private *priv = pp->private_data; 539 size_t got = 0; 540 541 if (change_mode(pp, ECR_EPP)) 542 return 0; 543 for (; got < length; got++) { 544 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL)) 545 break; 546 buf++; 547 if (priv->reg[0] & 0x01) { 548 clear_epp_timeout(pp); 549 break; 550 } 551 } 552 change_mode(pp, ECR_PS2); 553 return got; 554 } 555 556 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags) 557 { 558 struct parport_uss720_private *priv = pp->private_data; 559 size_t written = 0; 560 561 if (change_mode(pp, ECR_EPP)) 562 return 0; 563 for (; written < length; written++) { 564 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL)) 565 break; 566 buf++; 567 if (get_1284_register(pp, 1, NULL, GFP_KERNEL)) 568 break; 569 if (priv->reg[0] & 0x01) { 570 clear_epp_timeout(pp); 571 break; 572 } 573 } 574 change_mode(pp, ECR_PS2); 575 return written; 576 } 577 578 static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags) 579 { 580 struct parport_uss720_private *priv = pp->private_data; 581 struct usb_device *usbdev = priv->usbdev; 582 int rlen; 583 int i; 584 585 if (!usbdev) 586 return 0; 587 if (change_mode(pp, ECR_ECP)) 588 return 0; 589 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000); 590 if (i) 591 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen); 592 change_mode(pp, ECR_PS2); 593 return rlen; 594 } 595 596 static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags) 597 { 598 struct parport_uss720_private *priv = pp->private_data; 599 struct usb_device *usbdev = priv->usbdev; 600 int rlen; 601 int i; 602 603 if (!usbdev) 604 return 0; 605 if (change_mode(pp, ECR_ECP)) 606 return 0; 607 i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000); 608 if (i) 609 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %zu rlen %u\n", buffer, len, rlen); 610 change_mode(pp, ECR_PS2); 611 return rlen; 612 } 613 614 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags) 615 { 616 size_t written = 0; 617 618 if (change_mode(pp, ECR_ECP)) 619 return 0; 620 for (; written < len; written++) { 621 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL)) 622 break; 623 buffer++; 624 } 625 change_mode(pp, ECR_PS2); 626 return written; 627 } 628 629 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags) 630 { 631 struct parport_uss720_private *priv = pp->private_data; 632 struct usb_device *usbdev = priv->usbdev; 633 int rlen; 634 int i; 635 636 if (!usbdev) 637 return 0; 638 if (change_mode(pp, ECR_PPF)) 639 return 0; 640 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000); 641 if (i) 642 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen); 643 change_mode(pp, ECR_PS2); 644 return rlen; 645 } 646 647 /* --------------------------------------------------------------------- */ 648 649 static struct parport_operations parport_uss720_ops = 650 { 651 .owner = THIS_MODULE, 652 .write_data = parport_uss720_write_data, 653 .read_data = parport_uss720_read_data, 654 655 .write_control = parport_uss720_write_control, 656 .read_control = parport_uss720_read_control, 657 .frob_control = parport_uss720_frob_control, 658 659 .read_status = parport_uss720_read_status, 660 661 .enable_irq = parport_uss720_enable_irq, 662 .disable_irq = parport_uss720_disable_irq, 663 664 .data_forward = parport_uss720_data_forward, 665 .data_reverse = parport_uss720_data_reverse, 666 667 .init_state = parport_uss720_init_state, 668 .save_state = parport_uss720_save_state, 669 .restore_state = parport_uss720_restore_state, 670 671 .epp_write_data = parport_uss720_epp_write_data, 672 .epp_read_data = parport_uss720_epp_read_data, 673 .epp_write_addr = parport_uss720_epp_write_addr, 674 .epp_read_addr = parport_uss720_epp_read_addr, 675 676 .ecp_write_data = parport_uss720_ecp_write_data, 677 .ecp_read_data = parport_uss720_ecp_read_data, 678 .ecp_write_addr = parport_uss720_ecp_write_addr, 679 680 .compat_write_data = parport_uss720_write_compat, 681 .nibble_read_data = parport_ieee1284_read_nibble, 682 .byte_read_data = parport_ieee1284_read_byte, 683 }; 684 685 /* --------------------------------------------------------------------- */ 686 687 static int uss720_probe(struct usb_interface *intf, 688 const struct usb_device_id *id) 689 { 690 struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf)); 691 struct usb_host_interface *interface; 692 struct usb_endpoint_descriptor *epd; 693 struct parport_uss720_private *priv; 694 struct parport *pp; 695 unsigned char reg; 696 int i; 697 698 dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n", 699 le16_to_cpu(usbdev->descriptor.idVendor), 700 le16_to_cpu(usbdev->descriptor.idProduct)); 701 702 /* our known interfaces have 3 alternate settings */ 703 if (intf->num_altsetting != 3) { 704 usb_put_dev(usbdev); 705 return -ENODEV; 706 } 707 i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2); 708 dev_dbg(&intf->dev, "set interface result %d\n", i); 709 710 interface = intf->cur_altsetting; 711 712 if (interface->desc.bNumEndpoints < 3) { 713 usb_put_dev(usbdev); 714 return -ENODEV; 715 } 716 717 /* 718 * Allocate parport interface 719 */ 720 priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL); 721 if (!priv) { 722 usb_put_dev(usbdev); 723 return -ENOMEM; 724 } 725 priv->pp = NULL; 726 priv->usbdev = usbdev; 727 kref_init(&priv->ref_count); 728 spin_lock_init(&priv->asynclock); 729 INIT_LIST_HEAD(&priv->asynclist); 730 pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops); 731 if (!pp) { 732 printk(KERN_WARNING "uss720: could not register parport\n"); 733 goto probe_abort; 734 } 735 736 priv->pp = pp; 737 pp->private_data = priv; 738 pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT; 739 740 /* set the USS720 control register to manual mode, no ECP compression, enable all ints */ 741 set_1284_register(pp, 7, 0x00, GFP_KERNEL); 742 set_1284_register(pp, 6, 0x30, GFP_KERNEL); /* PS/2 mode */ 743 set_1284_register(pp, 2, 0x0c, GFP_KERNEL); 744 /* debugging */ 745 get_1284_register(pp, 0, ®, GFP_KERNEL); 746 dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg); 747 748 i = usb_find_last_int_in_endpoint(interface, &epd); 749 if (!i) { 750 dev_dbg(&intf->dev, "epaddr %d interval %d\n", 751 epd->bEndpointAddress, epd->bInterval); 752 } 753 parport_announce_port(pp); 754 755 usb_set_intfdata(intf, pp); 756 return 0; 757 758 probe_abort: 759 kill_all_async_requests_priv(priv); 760 kref_put(&priv->ref_count, destroy_priv); 761 return -ENODEV; 762 } 763 764 static void uss720_disconnect(struct usb_interface *intf) 765 { 766 struct parport *pp = usb_get_intfdata(intf); 767 struct parport_uss720_private *priv; 768 struct usb_device *usbdev; 769 770 dev_dbg(&intf->dev, "disconnect\n"); 771 usb_set_intfdata(intf, NULL); 772 if (pp) { 773 priv = pp->private_data; 774 usbdev = priv->usbdev; 775 priv->usbdev = NULL; 776 priv->pp = NULL; 777 dev_dbg(&intf->dev, "parport_remove_port\n"); 778 parport_remove_port(pp); 779 parport_put_port(pp); 780 kill_all_async_requests_priv(priv); 781 kref_put(&priv->ref_count, destroy_priv); 782 } 783 dev_dbg(&intf->dev, "disconnect done\n"); 784 } 785 786 /* table of cables that work through this driver */ 787 static const struct usb_device_id uss720_table[] = { 788 { USB_DEVICE(0x047e, 0x1001) }, 789 { USB_DEVICE(0x0557, 0x2001) }, 790 { USB_DEVICE(0x0729, 0x1284) }, 791 { USB_DEVICE(0x1293, 0x0002) }, 792 { USB_DEVICE(0x050d, 0x0002) }, 793 { } /* Terminating entry */ 794 }; 795 796 MODULE_DEVICE_TABLE (usb, uss720_table); 797 798 799 static struct usb_driver uss720_driver = { 800 .name = "uss720", 801 .probe = uss720_probe, 802 .disconnect = uss720_disconnect, 803 .id_table = uss720_table, 804 }; 805 806 /* --------------------------------------------------------------------- */ 807 808 MODULE_AUTHOR(DRIVER_AUTHOR); 809 MODULE_DESCRIPTION(DRIVER_DESC); 810 MODULE_LICENSE("GPL"); 811 812 static int __init uss720_init(void) 813 { 814 int retval; 815 retval = usb_register(&uss720_driver); 816 if (retval) 817 goto out; 818 819 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 820 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