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 54 /* 55 * Version Information 56 */ 57 #define DRIVER_VERSION "v0.6" 58 #define DRIVER_AUTHOR "Thomas M. Sailer, t.sailer@alumni.ethz.ch" 59 #define DRIVER_DESC "USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip" 60 61 /* --------------------------------------------------------------------- */ 62 63 struct parport_uss720_private { 64 struct usb_device *usbdev; 65 struct parport *pp; 66 struct kref ref_count; 67 __u8 reg[7]; /* USB registers */ 68 struct list_head asynclist; 69 spinlock_t asynclock; 70 }; 71 72 struct uss720_async_request { 73 struct parport_uss720_private *priv; 74 struct kref ref_count; 75 struct list_head asynclist; 76 struct completion compl; 77 struct urb *urb; 78 struct usb_ctrlrequest *dr; 79 __u8 reg[7]; 80 }; 81 82 /* --------------------------------------------------------------------- */ 83 84 static void destroy_priv(struct kref *kref) 85 { 86 struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count); 87 88 dev_dbg(&priv->usbdev->dev, "destroying priv datastructure\n"); 89 usb_put_dev(priv->usbdev); 90 kfree(priv); 91 } 92 93 static void destroy_async(struct kref *kref) 94 { 95 struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count); 96 struct parport_uss720_private *priv = rq->priv; 97 unsigned long flags; 98 99 if (likely(rq->urb)) 100 usb_free_urb(rq->urb); 101 kfree(rq->dr); 102 spin_lock_irqsave(&priv->asynclock, flags); 103 list_del_init(&rq->asynclist); 104 spin_unlock_irqrestore(&priv->asynclock, flags); 105 kfree(rq); 106 kref_put(&priv->ref_count, destroy_priv); 107 } 108 109 /* --------------------------------------------------------------------- */ 110 111 static void async_complete(struct urb *urb) 112 { 113 struct uss720_async_request *rq; 114 struct parport *pp; 115 struct parport_uss720_private *priv; 116 int status = urb->status; 117 118 rq = urb->context; 119 priv = rq->priv; 120 pp = priv->pp; 121 if (status) { 122 dev_err(&urb->dev->dev, "async_complete: urb error %d\n", 123 status); 124 } else if (rq->dr->bRequest == 3) { 125 memcpy(priv->reg, rq->reg, sizeof(priv->reg)); 126 #if 0 127 dev_dbg(&priv->usbdev->dev, "async_complete regs %7ph\n", 128 priv->reg); 129 #endif 130 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */ 131 if (rq->reg[2] & rq->reg[1] & 0x10 && pp) 132 parport_generic_irq(pp); 133 } 134 complete(&rq->compl); 135 kref_put(&rq->ref_count, destroy_async); 136 } 137 138 static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv, 139 __u8 request, __u8 requesttype, __u16 value, __u16 index, 140 gfp_t mem_flags) 141 { 142 struct usb_device *usbdev; 143 struct uss720_async_request *rq; 144 unsigned long flags; 145 int ret; 146 147 if (!priv) 148 return NULL; 149 usbdev = priv->usbdev; 150 if (!usbdev) 151 return NULL; 152 rq = kzalloc(sizeof(struct uss720_async_request), mem_flags); 153 if (!rq) { 154 dev_err(&usbdev->dev, "submit_async_request out of memory\n"); 155 return NULL; 156 } 157 kref_init(&rq->ref_count); 158 INIT_LIST_HEAD(&rq->asynclist); 159 init_completion(&rq->compl); 160 kref_get(&priv->ref_count); 161 rq->priv = priv; 162 rq->urb = usb_alloc_urb(0, mem_flags); 163 if (!rq->urb) { 164 kref_put(&rq->ref_count, destroy_async); 165 dev_err(&usbdev->dev, "submit_async_request out of memory\n"); 166 return NULL; 167 } 168 rq->dr = kmalloc(sizeof(*rq->dr), mem_flags); 169 if (!rq->dr) { 170 kref_put(&rq->ref_count, destroy_async); 171 return NULL; 172 } 173 rq->dr->bRequestType = requesttype; 174 rq->dr->bRequest = request; 175 rq->dr->wValue = cpu_to_le16(value); 176 rq->dr->wIndex = cpu_to_le16(index); 177 rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0); 178 usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0), 179 (unsigned char *)rq->dr, 180 (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq); 181 /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */ 182 spin_lock_irqsave(&priv->asynclock, flags); 183 list_add_tail(&rq->asynclist, &priv->asynclist); 184 spin_unlock_irqrestore(&priv->asynclock, flags); 185 kref_get(&rq->ref_count); 186 ret = usb_submit_urb(rq->urb, mem_flags); 187 if (!ret) 188 return rq; 189 destroy_async(&rq->ref_count); 190 dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret); 191 return NULL; 192 } 193 194 static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv) 195 { 196 struct uss720_async_request *rq; 197 unsigned long flags; 198 unsigned int ret = 0; 199 200 spin_lock_irqsave(&priv->asynclock, flags); 201 list_for_each_entry(rq, &priv->asynclist, asynclist) { 202 usb_unlink_urb(rq->urb); 203 ret++; 204 } 205 spin_unlock_irqrestore(&priv->asynclock, flags); 206 return ret; 207 } 208 209 /* --------------------------------------------------------------------- */ 210 211 static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags) 212 { 213 struct parport_uss720_private *priv; 214 struct uss720_async_request *rq; 215 static const unsigned char regindex[9] = { 216 4, 0, 1, 5, 5, 0, 2, 3, 6 217 }; 218 int ret; 219 220 if (!pp) 221 return -EIO; 222 priv = pp->private_data; 223 rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags); 224 if (!rq) { 225 dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed", 226 (unsigned int)reg); 227 return -EIO; 228 } 229 if (!val) { 230 kref_put(&rq->ref_count, destroy_async); 231 return 0; 232 } 233 if (wait_for_completion_timeout(&rq->compl, HZ)) { 234 ret = rq->urb->status; 235 *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]]; 236 if (ret) 237 printk(KERN_WARNING "get_1284_register: " 238 "usb error %d\n", ret); 239 kref_put(&rq->ref_count, destroy_async); 240 return ret; 241 } 242 printk(KERN_WARNING "get_1284_register timeout\n"); 243 kill_all_async_requests_priv(priv); 244 return -EIO; 245 } 246 247 static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags) 248 { 249 struct parport_uss720_private *priv; 250 struct uss720_async_request *rq; 251 252 if (!pp) 253 return -EIO; 254 priv = pp->private_data; 255 rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags); 256 if (!rq) { 257 dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed", 258 (unsigned int)reg, (unsigned int)val); 259 return -EIO; 260 } 261 kref_put(&rq->ref_count, destroy_async); 262 return 0; 263 } 264 265 /* --------------------------------------------------------------------- */ 266 267 /* ECR modes */ 268 #define ECR_SPP 00 269 #define ECR_PS2 01 270 #define ECR_PPF 02 271 #define ECR_ECP 03 272 #define ECR_EPP 04 273 274 /* Safely change the mode bits in the ECR */ 275 static int change_mode(struct parport *pp, int m) 276 { 277 struct parport_uss720_private *priv = pp->private_data; 278 int mode; 279 __u8 reg; 280 281 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 282 return -EIO; 283 /* Bits <7:5> contain the mode. */ 284 mode = (priv->reg[2] >> 5) & 0x7; 285 if (mode == m) 286 return 0; 287 /* We have to go through mode 000 or 001 */ 288 if (mode > ECR_PS2 && m > ECR_PS2) 289 if (change_mode(pp, ECR_PS2)) 290 return -EIO; 291 292 if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) { 293 /* This mode resets the FIFO, so we may 294 * have to wait for it to drain first. */ 295 unsigned long expire = jiffies + pp->physport->cad->timeout; 296 switch (mode) { 297 case ECR_PPF: /* Parallel Port FIFO mode */ 298 case ECR_ECP: /* ECP Parallel Port mode */ 299 /* Poll slowly. */ 300 for (;;) { 301 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 302 return -EIO; 303 if (priv->reg[2] & 0x01) 304 break; 305 if (time_after_eq (jiffies, expire)) 306 /* The FIFO is stuck. */ 307 return -EBUSY; 308 msleep_interruptible(10); 309 if (signal_pending (current)) 310 break; 311 } 312 } 313 } 314 /* Set the mode. */ 315 if (set_1284_register(pp, 6, m << 5, GFP_KERNEL)) 316 return -EIO; 317 if (get_1284_register(pp, 6, ®, GFP_KERNEL)) 318 return -EIO; 319 return 0; 320 } 321 322 /* 323 * Clear TIMEOUT BIT in EPP MODE 324 */ 325 static int clear_epp_timeout(struct parport *pp) 326 { 327 unsigned char stat; 328 329 if (get_1284_register(pp, 1, &stat, GFP_KERNEL)) 330 return 1; 331 return stat & 1; 332 } 333 334 /* 335 * Access functions. 336 */ 337 #if 0 338 static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id) 339 { 340 struct parport *pp = (struct parport *)dev_id; 341 struct parport_uss720_private *priv = pp->private_data; 342 343 if (usbstatus != 0 || len < 4 || !buffer) 344 return 1; 345 memcpy(priv->reg, buffer, 4); 346 /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */ 347 if (priv->reg[2] & priv->reg[1] & 0x10) 348 parport_generic_irq(pp); 349 return 1; 350 } 351 #endif 352 353 static void parport_uss720_write_data(struct parport *pp, unsigned char d) 354 { 355 set_1284_register(pp, 0, d, GFP_KERNEL); 356 } 357 358 static unsigned char parport_uss720_read_data(struct parport *pp) 359 { 360 unsigned char ret; 361 362 if (get_1284_register(pp, 0, &ret, GFP_KERNEL)) 363 return 0; 364 return ret; 365 } 366 367 static void parport_uss720_write_control(struct parport *pp, unsigned char d) 368 { 369 struct parport_uss720_private *priv = pp->private_data; 370 371 d = (d & 0xf) | (priv->reg[1] & 0xf0); 372 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 373 return; 374 priv->reg[1] = d; 375 } 376 377 static unsigned char parport_uss720_read_control(struct parport *pp) 378 { 379 struct parport_uss720_private *priv = pp->private_data; 380 return priv->reg[1] & 0xf; /* Use soft copy */ 381 } 382 383 static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val) 384 { 385 struct parport_uss720_private *priv = pp->private_data; 386 unsigned char d; 387 388 mask &= 0x0f; 389 val &= 0x0f; 390 d = (priv->reg[1] & (~mask)) ^ val; 391 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 392 return 0; 393 priv->reg[1] = d; 394 return d & 0xf; 395 } 396 397 static unsigned char parport_uss720_read_status(struct parport *pp) 398 { 399 unsigned char ret; 400 401 if (get_1284_register(pp, 1, &ret, GFP_KERNEL)) 402 return 0; 403 return ret & 0xf8; 404 } 405 406 static void parport_uss720_disable_irq(struct parport *pp) 407 { 408 struct parport_uss720_private *priv = pp->private_data; 409 unsigned char d; 410 411 d = priv->reg[1] & ~0x10; 412 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 413 return; 414 priv->reg[1] = d; 415 } 416 417 static void parport_uss720_enable_irq(struct parport *pp) 418 { 419 struct parport_uss720_private *priv = pp->private_data; 420 unsigned char d; 421 422 d = priv->reg[1] | 0x10; 423 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 424 return; 425 priv->reg[1] = d; 426 } 427 428 static void parport_uss720_data_forward (struct parport *pp) 429 { 430 struct parport_uss720_private *priv = pp->private_data; 431 unsigned char d; 432 433 d = priv->reg[1] & ~0x20; 434 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 435 return; 436 priv->reg[1] = d; 437 } 438 439 static void parport_uss720_data_reverse (struct parport *pp) 440 { 441 struct parport_uss720_private *priv = pp->private_data; 442 unsigned char d; 443 444 d = priv->reg[1] | 0x20; 445 if (set_1284_register(pp, 2, d, GFP_KERNEL)) 446 return; 447 priv->reg[1] = d; 448 } 449 450 static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s) 451 { 452 s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0); 453 s->u.pc.ecr = 0x24; 454 } 455 456 static void parport_uss720_save_state(struct parport *pp, struct parport_state *s) 457 { 458 struct parport_uss720_private *priv = pp->private_data; 459 460 #if 0 461 if (get_1284_register(pp, 2, NULL, GFP_ATOMIC)) 462 return; 463 #endif 464 s->u.pc.ctr = priv->reg[1]; 465 s->u.pc.ecr = priv->reg[2]; 466 } 467 468 static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s) 469 { 470 struct parport_uss720_private *priv = pp->private_data; 471 472 set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC); 473 set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC); 474 get_1284_register(pp, 2, NULL, GFP_ATOMIC); 475 priv->reg[1] = s->u.pc.ctr; 476 priv->reg[2] = s->u.pc.ecr; 477 } 478 479 static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags) 480 { 481 struct parport_uss720_private *priv = pp->private_data; 482 size_t got = 0; 483 484 if (change_mode(pp, ECR_EPP)) 485 return 0; 486 for (; got < length; got++) { 487 if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL)) 488 break; 489 buf++; 490 if (priv->reg[0] & 0x01) { 491 clear_epp_timeout(pp); 492 break; 493 } 494 } 495 change_mode(pp, ECR_PS2); 496 return got; 497 } 498 499 static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags) 500 { 501 #if 0 502 struct parport_uss720_private *priv = pp->private_data; 503 size_t written = 0; 504 505 if (change_mode(pp, ECR_EPP)) 506 return 0; 507 for (; written < length; written++) { 508 if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL)) 509 break; 510 ((char*)buf)++; 511 if (get_1284_register(pp, 1, NULL, GFP_KERNEL)) 512 break; 513 if (priv->reg[0] & 0x01) { 514 clear_epp_timeout(pp); 515 break; 516 } 517 } 518 change_mode(pp, ECR_PS2); 519 return written; 520 #else 521 struct parport_uss720_private *priv = pp->private_data; 522 struct usb_device *usbdev = priv->usbdev; 523 int rlen; 524 int i; 525 526 if (!usbdev) 527 return 0; 528 if (change_mode(pp, ECR_EPP)) 529 return 0; 530 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000); 531 if (i) 532 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buf, length, rlen); 533 change_mode(pp, ECR_PS2); 534 return rlen; 535 #endif 536 } 537 538 static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags) 539 { 540 struct parport_uss720_private *priv = pp->private_data; 541 size_t got = 0; 542 543 if (change_mode(pp, ECR_EPP)) 544 return 0; 545 for (; got < length; got++) { 546 if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL)) 547 break; 548 buf++; 549 if (priv->reg[0] & 0x01) { 550 clear_epp_timeout(pp); 551 break; 552 } 553 } 554 change_mode(pp, ECR_PS2); 555 return got; 556 } 557 558 static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags) 559 { 560 struct parport_uss720_private *priv = pp->private_data; 561 size_t written = 0; 562 563 if (change_mode(pp, ECR_EPP)) 564 return 0; 565 for (; written < length; written++) { 566 if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL)) 567 break; 568 buf++; 569 if (get_1284_register(pp, 1, NULL, GFP_KERNEL)) 570 break; 571 if (priv->reg[0] & 0x01) { 572 clear_epp_timeout(pp); 573 break; 574 } 575 } 576 change_mode(pp, ECR_PS2); 577 return written; 578 } 579 580 static size_t parport_uss720_ecp_write_data(struct parport *pp, const 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; 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_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000); 592 if (i) 593 printk(KERN_ERR "uss720: sendbulk ep 1 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_read_data(struct parport *pp, void *buffer, size_t len, int flags) 599 { 600 struct parport_uss720_private *priv = pp->private_data; 601 struct usb_device *usbdev = priv->usbdev; 602 int rlen; 603 int i; 604 605 if (!usbdev) 606 return 0; 607 if (change_mode(pp, ECR_ECP)) 608 return 0; 609 i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000); 610 if (i) 611 printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %Zu rlen %u\n", buffer, len, rlen); 612 change_mode(pp, ECR_PS2); 613 return rlen; 614 } 615 616 static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags) 617 { 618 size_t written = 0; 619 620 if (change_mode(pp, ECR_ECP)) 621 return 0; 622 for (; written < len; written++) { 623 if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL)) 624 break; 625 buffer++; 626 } 627 change_mode(pp, ECR_PS2); 628 return written; 629 } 630 631 static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags) 632 { 633 struct parport_uss720_private *priv = pp->private_data; 634 struct usb_device *usbdev = priv->usbdev; 635 int rlen; 636 int i; 637 638 if (!usbdev) 639 return 0; 640 if (change_mode(pp, ECR_PPF)) 641 return 0; 642 i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000); 643 if (i) 644 printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen); 645 change_mode(pp, ECR_PS2); 646 return rlen; 647 } 648 649 /* --------------------------------------------------------------------- */ 650 651 static struct parport_operations parport_uss720_ops = 652 { 653 .owner = THIS_MODULE, 654 .write_data = parport_uss720_write_data, 655 .read_data = parport_uss720_read_data, 656 657 .write_control = parport_uss720_write_control, 658 .read_control = parport_uss720_read_control, 659 .frob_control = parport_uss720_frob_control, 660 661 .read_status = parport_uss720_read_status, 662 663 .enable_irq = parport_uss720_enable_irq, 664 .disable_irq = parport_uss720_disable_irq, 665 666 .data_forward = parport_uss720_data_forward, 667 .data_reverse = parport_uss720_data_reverse, 668 669 .init_state = parport_uss720_init_state, 670 .save_state = parport_uss720_save_state, 671 .restore_state = parport_uss720_restore_state, 672 673 .epp_write_data = parport_uss720_epp_write_data, 674 .epp_read_data = parport_uss720_epp_read_data, 675 .epp_write_addr = parport_uss720_epp_write_addr, 676 .epp_read_addr = parport_uss720_epp_read_addr, 677 678 .ecp_write_data = parport_uss720_ecp_write_data, 679 .ecp_read_data = parport_uss720_ecp_read_data, 680 .ecp_write_addr = parport_uss720_ecp_write_addr, 681 682 .compat_write_data = parport_uss720_write_compat, 683 .nibble_read_data = parport_ieee1284_read_nibble, 684 .byte_read_data = parport_ieee1284_read_byte, 685 }; 686 687 /* --------------------------------------------------------------------- */ 688 689 static int uss720_probe(struct usb_interface *intf, 690 const struct usb_device_id *id) 691 { 692 struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf)); 693 struct usb_host_interface *interface; 694 struct usb_host_endpoint *endpoint; 695 struct parport_uss720_private *priv; 696 struct parport *pp; 697 unsigned char reg; 698 int i; 699 700 dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n", 701 le16_to_cpu(usbdev->descriptor.idVendor), 702 le16_to_cpu(usbdev->descriptor.idProduct)); 703 704 /* our known interfaces have 3 alternate settings */ 705 if (intf->num_altsetting != 3) { 706 usb_put_dev(usbdev); 707 return -ENODEV; 708 } 709 i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2); 710 dev_dbg(&intf->dev, "set interface result %d\n", i); 711 712 interface = intf->cur_altsetting; 713 714 /* 715 * Allocate parport interface 716 */ 717 priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL); 718 if (!priv) { 719 usb_put_dev(usbdev); 720 return -ENOMEM; 721 } 722 priv->pp = NULL; 723 priv->usbdev = usbdev; 724 kref_init(&priv->ref_count); 725 spin_lock_init(&priv->asynclock); 726 INIT_LIST_HEAD(&priv->asynclist); 727 pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops); 728 if (!pp) { 729 printk(KERN_WARNING "uss720: could not register parport\n"); 730 goto probe_abort; 731 } 732 733 priv->pp = pp; 734 pp->private_data = priv; 735 pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT; 736 737 /* set the USS720 control register to manual mode, no ECP compression, enable all ints */ 738 set_1284_register(pp, 7, 0x00, GFP_KERNEL); 739 set_1284_register(pp, 6, 0x30, GFP_KERNEL); /* PS/2 mode */ 740 set_1284_register(pp, 2, 0x0c, GFP_KERNEL); 741 /* debugging */ 742 get_1284_register(pp, 0, ®, GFP_KERNEL); 743 dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg); 744 745 endpoint = &interface->endpoint[2]; 746 dev_dbg(&intf->dev, "epaddr %d interval %d\n", 747 endpoint->desc.bEndpointAddress, endpoint->desc.bInterval); 748 parport_announce_port(pp); 749 750 usb_set_intfdata(intf, pp); 751 return 0; 752 753 probe_abort: 754 kill_all_async_requests_priv(priv); 755 kref_put(&priv->ref_count, destroy_priv); 756 return -ENODEV; 757 } 758 759 static void uss720_disconnect(struct usb_interface *intf) 760 { 761 struct parport *pp = usb_get_intfdata(intf); 762 struct parport_uss720_private *priv; 763 struct usb_device *usbdev; 764 765 dev_dbg(&intf->dev, "disconnect\n"); 766 usb_set_intfdata(intf, NULL); 767 if (pp) { 768 priv = pp->private_data; 769 usbdev = priv->usbdev; 770 priv->usbdev = NULL; 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) }, 784 { USB_DEVICE(0x0557, 0x2001) }, 785 { USB_DEVICE(0x0729, 0x1284) }, 786 { USB_DEVICE(0x1293, 0x0002) }, 787 { USB_DEVICE(0x050d, 0x0002) }, 788 { } /* Terminating entry */ 789 }; 790 791 MODULE_DEVICE_TABLE (usb, uss720_table); 792 793 794 static struct usb_driver uss720_driver = { 795 .name = "uss720", 796 .probe = uss720_probe, 797 .disconnect = uss720_disconnect, 798 .id_table = uss720_table, 799 }; 800 801 /* --------------------------------------------------------------------- */ 802 803 MODULE_AUTHOR(DRIVER_AUTHOR); 804 MODULE_DESCRIPTION(DRIVER_DESC); 805 MODULE_LICENSE("GPL"); 806 807 static int __init uss720_init(void) 808 { 809 int retval; 810 retval = usb_register(&uss720_driver); 811 if (retval) 812 goto out; 813 814 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 815 DRIVER_DESC "\n"); 816 printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose " 817 "driver to allow nonstandard\n"); 818 printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over " 819 "USS720 usb to parallel cables\n"); 820 printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a " 821 "printer, use usblp instead\n"); 822 out: 823 return retval; 824 } 825 826 static void __exit uss720_cleanup(void) 827 { 828 usb_deregister(&uss720_driver); 829 } 830 831 module_init(uss720_init); 832 module_exit(uss720_cleanup); 833 834 /* --------------------------------------------------------------------- */ 835