1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2023 Ondrej Zary 4 * based on paride.c by Grant R. Guenther <grant@torque.net> 5 */ 6 #include <linux/kernel.h> 7 #include <linux/module.h> 8 #include <linux/parport.h> 9 #include <linux/pata_parport.h> 10 11 #define DRV_NAME "pata_parport" 12 13 static DEFINE_IDR(parport_list); 14 static DEFINE_IDR(protocols); 15 static DEFINE_IDA(pata_parport_bus_dev_ids); 16 static DEFINE_MUTEX(pi_mutex); 17 18 static bool probe = true; 19 module_param(probe, bool, 0644); 20 MODULE_PARM_DESC(probe, "Enable automatic device probing (0=off, 1=on [default])"); 21 22 /* 23 * libata drivers cannot sleep so this driver claims parport before activating 24 * the ata host and keeps it claimed (and protocol connected) until the ata 25 * host is removed. Unfortunately, this means that you cannot use any chained 26 * devices (neither other pata_parport devices nor a printer). 27 */ 28 static void pi_connect(struct pi_adapter *pi) 29 { 30 parport_claim_or_block(pi->pardev); 31 pi->proto->connect(pi); 32 } 33 34 static void pi_disconnect(struct pi_adapter *pi) 35 { 36 pi->proto->disconnect(pi); 37 parport_release(pi->pardev); 38 } 39 40 static void pata_parport_dev_select(struct ata_port *ap, unsigned int device) 41 { 42 struct pi_adapter *pi = ap->host->private_data; 43 u8 tmp; 44 45 if (device == 0) 46 tmp = ATA_DEVICE_OBS; 47 else 48 tmp = ATA_DEVICE_OBS | ATA_DEV1; 49 50 pi->proto->write_regr(pi, 0, ATA_REG_DEVICE, tmp); 51 ata_sff_pause(ap); 52 } 53 54 static bool pata_parport_devchk(struct ata_port *ap, unsigned int device) 55 { 56 struct pi_adapter *pi = ap->host->private_data; 57 u8 nsect, lbal; 58 59 pata_parport_dev_select(ap, device); 60 61 pi->proto->write_regr(pi, 0, ATA_REG_NSECT, 0x55); 62 pi->proto->write_regr(pi, 0, ATA_REG_LBAL, 0xaa); 63 64 pi->proto->write_regr(pi, 0, ATA_REG_NSECT, 0xaa); 65 pi->proto->write_regr(pi, 0, ATA_REG_LBAL, 0x55); 66 67 pi->proto->write_regr(pi, 0, ATA_REG_NSECT, 055); 68 pi->proto->write_regr(pi, 0, ATA_REG_LBAL, 0xaa); 69 70 nsect = pi->proto->read_regr(pi, 0, ATA_REG_NSECT); 71 lbal = pi->proto->read_regr(pi, 0, ATA_REG_LBAL); 72 73 return (nsect == 0x55) && (lbal == 0xaa); 74 } 75 76 static int pata_parport_bus_softreset(struct ata_port *ap, unsigned int devmask, 77 unsigned long deadline) 78 { 79 struct pi_adapter *pi = ap->host->private_data; 80 81 /* software reset. causes dev0 to be selected */ 82 pi->proto->write_regr(pi, 1, 6, ap->ctl); 83 udelay(20); 84 pi->proto->write_regr(pi, 1, 6, ap->ctl | ATA_SRST); 85 udelay(20); 86 pi->proto->write_regr(pi, 1, 6, ap->ctl); 87 ap->last_ctl = ap->ctl; 88 89 /* wait the port to become ready */ 90 return ata_sff_wait_after_reset(&ap->link, devmask, deadline); 91 } 92 93 static int pata_parport_softreset(struct ata_link *link, unsigned int *classes, 94 unsigned long deadline) 95 { 96 struct ata_port *ap = link->ap; 97 unsigned int devmask = 0; 98 int rc; 99 u8 err; 100 101 /* determine if device 0/1 are present */ 102 if (pata_parport_devchk(ap, 0)) 103 devmask |= (1 << 0); 104 if (pata_parport_devchk(ap, 1)) 105 devmask |= (1 << 1); 106 107 /* select device 0 again */ 108 pata_parport_dev_select(ap, 0); 109 110 /* issue bus reset */ 111 rc = pata_parport_bus_softreset(ap, devmask, deadline); 112 if (rc && rc != -ENODEV) { 113 ata_link_err(link, "SRST failed (errno=%d)\n", rc); 114 return rc; 115 } 116 117 /* determine by signature whether we have ATA or ATAPI devices */ 118 classes[0] = ata_sff_dev_classify(&link->device[0], 119 devmask & (1 << 0), &err); 120 if (err != 0x81) 121 classes[1] = ata_sff_dev_classify(&link->device[1], 122 devmask & (1 << 1), &err); 123 124 return 0; 125 } 126 127 static u8 pata_parport_check_status(struct ata_port *ap) 128 { 129 struct pi_adapter *pi = ap->host->private_data; 130 131 return pi->proto->read_regr(pi, 0, ATA_REG_STATUS); 132 } 133 134 static u8 pata_parport_check_altstatus(struct ata_port *ap) 135 { 136 struct pi_adapter *pi = ap->host->private_data; 137 138 return pi->proto->read_regr(pi, 1, 6); 139 } 140 141 static void pata_parport_tf_load(struct ata_port *ap, 142 const struct ata_taskfile *tf) 143 { 144 struct pi_adapter *pi = ap->host->private_data; 145 146 if (tf->ctl != ap->last_ctl) { 147 pi->proto->write_regr(pi, 1, 6, tf->ctl); 148 ap->last_ctl = tf->ctl; 149 ata_wait_idle(ap); 150 } 151 152 if (tf->flags & ATA_TFLAG_ISADDR) { 153 if (tf->flags & ATA_TFLAG_LBA48) { 154 pi->proto->write_regr(pi, 0, ATA_REG_FEATURE, 155 tf->hob_feature); 156 pi->proto->write_regr(pi, 0, ATA_REG_NSECT, 157 tf->hob_nsect); 158 pi->proto->write_regr(pi, 0, ATA_REG_LBAL, 159 tf->hob_lbal); 160 pi->proto->write_regr(pi, 0, ATA_REG_LBAM, 161 tf->hob_lbam); 162 pi->proto->write_regr(pi, 0, ATA_REG_LBAH, 163 tf->hob_lbah); 164 } 165 pi->proto->write_regr(pi, 0, ATA_REG_FEATURE, tf->feature); 166 pi->proto->write_regr(pi, 0, ATA_REG_NSECT, tf->nsect); 167 pi->proto->write_regr(pi, 0, ATA_REG_LBAL, tf->lbal); 168 pi->proto->write_regr(pi, 0, ATA_REG_LBAM, tf->lbam); 169 pi->proto->write_regr(pi, 0, ATA_REG_LBAH, tf->lbah); 170 } 171 172 if (tf->flags & ATA_TFLAG_DEVICE) 173 pi->proto->write_regr(pi, 0, ATA_REG_DEVICE, tf->device); 174 175 ata_wait_idle(ap); 176 } 177 178 static void pata_parport_tf_read(struct ata_port *ap, struct ata_taskfile *tf) 179 { 180 struct pi_adapter *pi = ap->host->private_data; 181 182 tf->status = pi->proto->read_regr(pi, 0, ATA_REG_STATUS); 183 tf->error = pi->proto->read_regr(pi, 0, ATA_REG_ERR); 184 tf->nsect = pi->proto->read_regr(pi, 0, ATA_REG_NSECT); 185 tf->lbal = pi->proto->read_regr(pi, 0, ATA_REG_LBAL); 186 tf->lbam = pi->proto->read_regr(pi, 0, ATA_REG_LBAM); 187 tf->lbah = pi->proto->read_regr(pi, 0, ATA_REG_LBAH); 188 tf->device = pi->proto->read_regr(pi, 0, ATA_REG_DEVICE); 189 190 if (tf->flags & ATA_TFLAG_LBA48) { 191 pi->proto->write_regr(pi, 1, 6, tf->ctl | ATA_HOB); 192 tf->hob_feature = pi->proto->read_regr(pi, 0, ATA_REG_ERR); 193 tf->hob_nsect = pi->proto->read_regr(pi, 0, ATA_REG_NSECT); 194 tf->hob_lbal = pi->proto->read_regr(pi, 0, ATA_REG_LBAL); 195 tf->hob_lbam = pi->proto->read_regr(pi, 0, ATA_REG_LBAM); 196 tf->hob_lbah = pi->proto->read_regr(pi, 0, ATA_REG_LBAH); 197 pi->proto->write_regr(pi, 1, 6, tf->ctl); 198 ap->last_ctl = tf->ctl; 199 } 200 } 201 202 static void pata_parport_exec_command(struct ata_port *ap, 203 const struct ata_taskfile *tf) 204 { 205 struct pi_adapter *pi = ap->host->private_data; 206 207 pi->proto->write_regr(pi, 0, ATA_REG_CMD, tf->command); 208 ata_sff_pause(ap); 209 } 210 211 static unsigned int pata_parport_data_xfer(struct ata_queued_cmd *qc, 212 unsigned char *buf, unsigned int buflen, int rw) 213 { 214 struct ata_port *ap = qc->dev->link->ap; 215 struct pi_adapter *pi = ap->host->private_data; 216 217 if (rw == READ) 218 pi->proto->read_block(pi, buf, buflen); 219 else 220 pi->proto->write_block(pi, buf, buflen); 221 222 return buflen; 223 } 224 225 static void pata_parport_drain_fifo(struct ata_queued_cmd *qc) 226 { 227 int count; 228 struct ata_port *ap; 229 struct pi_adapter *pi; 230 char junk[2]; 231 232 /* We only need to flush incoming data when a command was running */ 233 if (qc == NULL || qc->dma_dir == DMA_TO_DEVICE) 234 return; 235 236 ap = qc->ap; 237 pi = ap->host->private_data; 238 /* Drain up to 64K of data before we give up this recovery method */ 239 for (count = 0; (pata_parport_check_status(ap) & ATA_DRQ) 240 && count < 65536; count += 2) { 241 pi->proto->read_block(pi, junk, 2); 242 } 243 244 if (count) 245 ata_port_dbg(ap, "drained %d bytes to clear DRQ\n", count); 246 } 247 248 static struct ata_port_operations pata_parport_port_ops = { 249 .inherits = &ata_sff_port_ops, 250 251 .softreset = pata_parport_softreset, 252 .hardreset = NULL, 253 254 .sff_dev_select = pata_parport_dev_select, 255 .sff_check_status = pata_parport_check_status, 256 .sff_check_altstatus = pata_parport_check_altstatus, 257 .sff_tf_load = pata_parport_tf_load, 258 .sff_tf_read = pata_parport_tf_read, 259 .sff_exec_command = pata_parport_exec_command, 260 .sff_data_xfer = pata_parport_data_xfer, 261 .sff_drain_fifo = pata_parport_drain_fifo, 262 }; 263 264 static const struct ata_port_info pata_parport_port_info = { 265 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_POLLING, 266 .pio_mask = ATA_PIO0, 267 /* No DMA */ 268 .port_ops = &pata_parport_port_ops, 269 }; 270 271 static void pi_release(struct pi_adapter *pi) 272 { 273 parport_unregister_device(pi->pardev); 274 if (pi->proto->release_proto) 275 pi->proto->release_proto(pi); 276 module_put(pi->proto->owner); 277 } 278 279 static int default_test_proto(struct pi_adapter *pi, char *scratch) 280 { 281 int j, k; 282 int e[2] = { 0, 0 }; 283 284 pi->proto->connect(pi); 285 286 for (j = 0; j < 2; j++) { 287 pi->proto->write_regr(pi, 0, 6, 0xa0 + j * 0x10); 288 for (k = 0; k < 256; k++) { 289 pi->proto->write_regr(pi, 0, 2, k ^ 0xaa); 290 pi->proto->write_regr(pi, 0, 3, k ^ 0x55); 291 if (pi->proto->read_regr(pi, 0, 2) != (k ^ 0xaa)) 292 e[j]++; 293 } 294 } 295 pi->proto->disconnect(pi); 296 297 dev_dbg(&pi->dev, "%s: port 0x%x, mode %d, test=(%d,%d)\n", 298 pi->proto->name, pi->port, pi->mode, e[0], e[1]); 299 300 return e[0] && e[1]; /* not here if both > 0 */ 301 } 302 303 static int pi_test_proto(struct pi_adapter *pi, char *scratch) 304 { 305 int res; 306 307 parport_claim_or_block(pi->pardev); 308 if (pi->proto->test_proto) 309 res = pi->proto->test_proto(pi, scratch, 1); 310 else 311 res = default_test_proto(pi, scratch); 312 parport_release(pi->pardev); 313 314 return res; 315 } 316 317 static bool pi_probe_mode(struct pi_adapter *pi, int max, char *scratch) 318 { 319 int best, range; 320 321 if (pi->mode != -1) { 322 if (pi->mode >= max) 323 return false; 324 range = 3; 325 if (pi->mode >= pi->proto->epp_first) 326 range = 8; 327 if (range == 8 && pi->port % 8) 328 return false; 329 return !pi_test_proto(pi, scratch); 330 } 331 best = -1; 332 for (pi->mode = 0; pi->mode < max; pi->mode++) { 333 range = 3; 334 if (pi->mode >= pi->proto->epp_first) 335 range = 8; 336 if (range == 8 && pi->port % 8) 337 break; 338 if (!pi_test_proto(pi, scratch)) 339 best = pi->mode; 340 } 341 pi->mode = best; 342 return best > -1; 343 } 344 345 static bool pi_probe_unit(struct pi_adapter *pi, int unit, char *scratch) 346 { 347 int max, s, e; 348 349 s = unit; 350 e = s + 1; 351 352 if (s == -1) { 353 s = 0; 354 e = pi->proto->max_units; 355 } 356 357 if (pi->proto->test_port) { 358 parport_claim_or_block(pi->pardev); 359 max = pi->proto->test_port(pi); 360 parport_release(pi->pardev); 361 } else { 362 max = pi->proto->max_mode; 363 } 364 365 if (pi->proto->probe_unit) { 366 parport_claim_or_block(pi->pardev); 367 for (pi->unit = s; pi->unit < e; pi->unit++) { 368 if (pi->proto->probe_unit(pi)) { 369 parport_release(pi->pardev); 370 return pi_probe_mode(pi, max, scratch); 371 } 372 } 373 parport_release(pi->pardev); 374 return false; 375 } 376 377 return pi_probe_mode(pi, max, scratch); 378 } 379 380 static void pata_parport_dev_release(struct device *dev) 381 { 382 struct pi_adapter *pi = container_of(dev, struct pi_adapter, dev); 383 384 kfree(pi); 385 } 386 387 static void pata_parport_bus_release(struct device *dev) 388 { 389 /* nothing to do here but required to avoid warning on device removal */ 390 } 391 392 static struct bus_type pata_parport_bus_type = { 393 .name = DRV_NAME, 394 }; 395 396 static struct device pata_parport_bus = { 397 .init_name = DRV_NAME, 398 .release = pata_parport_bus_release, 399 }; 400 401 static struct scsi_host_template pata_parport_sht = { 402 PATA_PARPORT_SHT("pata_parport") 403 }; 404 405 struct pi_device_match { 406 struct parport *parport; 407 struct pi_protocol *proto; 408 }; 409 410 static int pi_find_dev(struct device *dev, void *data) 411 { 412 struct pi_adapter *pi = container_of(dev, struct pi_adapter, dev); 413 struct pi_device_match *match = data; 414 415 return pi->pardev->port == match->parport && pi->proto == match->proto; 416 } 417 418 static struct pi_adapter *pi_init_one(struct parport *parport, 419 struct pi_protocol *pr, int mode, int unit, int delay) 420 { 421 struct pardev_cb par_cb = { }; 422 char scratch[512]; 423 const struct ata_port_info *ppi[] = { &pata_parport_port_info }; 424 struct ata_host *host; 425 struct pi_adapter *pi; 426 struct pi_device_match match = { .parport = parport, .proto = pr }; 427 int id; 428 429 /* 430 * Abort if there's a device already registered on the same parport 431 * using the same protocol. 432 */ 433 if (bus_for_each_dev(&pata_parport_bus_type, NULL, &match, pi_find_dev)) 434 return NULL; 435 436 pi = kzalloc(sizeof(struct pi_adapter), GFP_KERNEL); 437 if (!pi) 438 return NULL; 439 440 /* set up pi->dev before pi_probe_unit() so it can use dev_printk() */ 441 pi->dev.parent = &pata_parport_bus; 442 pi->dev.bus = &pata_parport_bus_type; 443 pi->dev.driver = &pr->driver; 444 pi->dev.release = pata_parport_dev_release; 445 id = ida_alloc(&pata_parport_bus_dev_ids, GFP_KERNEL); 446 if (id < 0) 447 return NULL; /* pata_parport_dev_release will do kfree(pi) */ 448 pi->dev.id = id; 449 dev_set_name(&pi->dev, "pata_parport.%u", pi->dev.id); 450 if (device_register(&pi->dev)) { 451 put_device(&pi->dev); 452 goto out_ida_free; 453 } 454 455 pi->proto = pr; 456 457 if (!try_module_get(pi->proto->owner)) 458 goto out_unreg_dev; 459 if (pi->proto->init_proto && pi->proto->init_proto(pi) < 0) 460 goto out_module_put; 461 462 pi->delay = (delay == -1) ? pi->proto->default_delay : delay; 463 pi->mode = mode; 464 pi->port = parport->base; 465 466 par_cb.private = pi; 467 pi->pardev = parport_register_dev_model(parport, DRV_NAME, &par_cb, 468 pi->dev.id); 469 if (!pi->pardev) 470 goto out_module_put; 471 472 if (!pi_probe_unit(pi, unit, scratch)) { 473 dev_info(&pi->dev, "Adapter not found\n"); 474 goto out_unreg_parport; 475 } 476 477 pi->proto->log_adapter(pi, scratch, 1); 478 479 host = ata_host_alloc_pinfo(&pi->pardev->dev, ppi, 1); 480 if (!host) 481 goto out_unreg_parport; 482 dev_set_drvdata(&pi->dev, host); 483 host->private_data = pi; 484 485 ata_port_desc(host->ports[0], "port %s", pi->pardev->port->name); 486 ata_port_desc(host->ports[0], "protocol %s", pi->proto->name); 487 488 pi_connect(pi); 489 if (ata_host_activate(host, 0, NULL, 0, &pata_parport_sht)) 490 goto out_unreg_parport; 491 492 return pi; 493 494 out_unreg_parport: 495 pi_disconnect(pi); 496 parport_unregister_device(pi->pardev); 497 if (pi->proto->release_proto) 498 pi->proto->release_proto(pi); 499 out_module_put: 500 module_put(pi->proto->owner); 501 out_unreg_dev: 502 device_unregister(&pi->dev); 503 out_ida_free: 504 ida_free(&pata_parport_bus_dev_ids, pi->dev.id); 505 return NULL; 506 } 507 508 int pata_parport_register_driver(struct pi_protocol *pr) 509 { 510 int error; 511 struct parport *parport; 512 int port_num; 513 514 pr->driver.bus = &pata_parport_bus_type; 515 pr->driver.name = pr->name; 516 error = driver_register(&pr->driver); 517 if (error) 518 return error; 519 520 mutex_lock(&pi_mutex); 521 error = idr_alloc(&protocols, pr, 0, 0, GFP_KERNEL); 522 if (error < 0) { 523 driver_unregister(&pr->driver); 524 mutex_unlock(&pi_mutex); 525 return error; 526 } 527 528 pr_info("pata_parport: protocol %s registered\n", pr->name); 529 530 if (probe) { 531 /* probe all parports using this protocol */ 532 idr_for_each_entry(&parport_list, parport, port_num) 533 pi_init_one(parport, pr, -1, 0, -1); 534 } 535 mutex_unlock(&pi_mutex); 536 537 return 0; 538 } 539 EXPORT_SYMBOL_GPL(pata_parport_register_driver); 540 541 void pata_parport_unregister_driver(struct pi_protocol *pr) 542 { 543 struct pi_protocol *pr_iter; 544 int id = -1; 545 546 mutex_lock(&pi_mutex); 547 idr_for_each_entry(&protocols, pr_iter, id) { 548 if (pr_iter == pr) 549 break; 550 } 551 idr_remove(&protocols, id); 552 mutex_unlock(&pi_mutex); 553 driver_unregister(&pr->driver); 554 } 555 EXPORT_SYMBOL_GPL(pata_parport_unregister_driver); 556 557 static ssize_t new_device_store(struct bus_type *bus, const char *buf, 558 size_t count) 559 { 560 char port[12] = "auto"; 561 char protocol[8] = "auto"; 562 int mode = -1, unit = -1, delay = -1; 563 struct pi_protocol *pr, *pr_wanted; 564 struct device_driver *drv; 565 struct parport *parport; 566 int port_num, port_wanted, pr_num; 567 bool ok = false; 568 569 if (sscanf(buf, "%11s %7s %d %d %d", 570 port, protocol, &mode, &unit, &delay) < 1) 571 return -EINVAL; 572 573 if (sscanf(port, "parport%u", &port_wanted) < 1) { 574 if (strcmp(port, "auto")) { 575 pr_err("invalid port name %s\n", port); 576 return -EINVAL; 577 } 578 port_wanted = -1; 579 } 580 581 drv = driver_find(protocol, &pata_parport_bus_type); 582 if (!drv) { 583 if (strcmp(protocol, "auto")) { 584 pr_err("protocol %s not found\n", protocol); 585 return -EINVAL; 586 } 587 pr_wanted = NULL; 588 } else { 589 pr_wanted = container_of(drv, struct pi_protocol, driver); 590 } 591 592 mutex_lock(&pi_mutex); 593 /* walk all parports */ 594 idr_for_each_entry(&parport_list, parport, port_num) { 595 if (port_num == port_wanted || port_wanted == -1) { 596 parport = parport_find_number(port_num); 597 if (!parport) { 598 pr_err("no such port %s\n", port); 599 mutex_unlock(&pi_mutex); 600 return -ENODEV; 601 } 602 /* walk all protocols */ 603 idr_for_each_entry(&protocols, pr, pr_num) { 604 if (pr == pr_wanted || !pr_wanted) 605 if (pi_init_one(parport, pr, mode, unit, 606 delay)) 607 ok = true; 608 } 609 parport_put_port(parport); 610 } 611 } 612 mutex_unlock(&pi_mutex); 613 if (!ok) 614 return -ENODEV; 615 616 return count; 617 } 618 static BUS_ATTR_WO(new_device); 619 620 static void pi_remove_one(struct device *dev) 621 { 622 struct ata_host *host = dev_get_drvdata(dev); 623 struct pi_adapter *pi = host->private_data; 624 625 ata_host_detach(host); 626 pi_disconnect(pi); 627 pi_release(pi); 628 device_unregister(dev); 629 ida_free(&pata_parport_bus_dev_ids, dev->id); 630 /* pata_parport_dev_release will do kfree(pi) */ 631 } 632 633 static ssize_t delete_device_store(struct bus_type *bus, const char *buf, 634 size_t count) 635 { 636 struct device *dev; 637 638 mutex_lock(&pi_mutex); 639 dev = bus_find_device_by_name(bus, NULL, buf); 640 if (!dev) { 641 mutex_unlock(&pi_mutex); 642 return -ENODEV; 643 } 644 645 pi_remove_one(dev); 646 mutex_unlock(&pi_mutex); 647 648 return count; 649 } 650 static BUS_ATTR_WO(delete_device); 651 652 static void pata_parport_attach(struct parport *port) 653 { 654 struct pi_protocol *pr; 655 int pr_num, id; 656 657 mutex_lock(&pi_mutex); 658 id = idr_alloc(&parport_list, port, port->number, port->number, 659 GFP_KERNEL); 660 if (id < 0) { 661 mutex_unlock(&pi_mutex); 662 return; 663 } 664 665 if (probe) { 666 /* probe this port using all protocols */ 667 idr_for_each_entry(&protocols, pr, pr_num) 668 pi_init_one(port, pr, -1, 0, -1); 669 } 670 mutex_unlock(&pi_mutex); 671 } 672 673 static int pi_remove_port(struct device *dev, void *p) 674 { 675 struct ata_host *host = dev_get_drvdata(dev); 676 struct pi_adapter *pi = host->private_data; 677 678 if (pi->pardev->port == p) 679 pi_remove_one(dev); 680 681 return 0; 682 } 683 684 static void pata_parport_detach(struct parport *port) 685 { 686 mutex_lock(&pi_mutex); 687 bus_for_each_dev(&pata_parport_bus_type, NULL, port, pi_remove_port); 688 idr_remove(&parport_list, port->number); 689 mutex_unlock(&pi_mutex); 690 } 691 692 static struct parport_driver pata_parport_driver = { 693 .name = DRV_NAME, 694 .match_port = pata_parport_attach, 695 .detach = pata_parport_detach, 696 .devmodel = true, 697 }; 698 699 static __init int pata_parport_init(void) 700 { 701 int error; 702 703 error = bus_register(&pata_parport_bus_type); 704 if (error) { 705 pr_err("failed to register pata_parport bus, error: %d\n", error); 706 return error; 707 } 708 709 error = device_register(&pata_parport_bus); 710 if (error) { 711 pr_err("failed to register pata_parport bus, error: %d\n", error); 712 goto out_unregister_bus; 713 } 714 715 error = bus_create_file(&pata_parport_bus_type, &bus_attr_new_device); 716 if (error) { 717 pr_err("unable to create sysfs file, error: %d\n", error); 718 goto out_unregister_dev; 719 } 720 721 error = bus_create_file(&pata_parport_bus_type, &bus_attr_delete_device); 722 if (error) { 723 pr_err("unable to create sysfs file, error: %d\n", error); 724 goto out_remove_new; 725 } 726 727 error = parport_register_driver(&pata_parport_driver); 728 if (error) { 729 pr_err("unable to register parport driver, error: %d\n", error); 730 goto out_remove_del; 731 } 732 733 return 0; 734 735 out_remove_del: 736 bus_remove_file(&pata_parport_bus_type, &bus_attr_delete_device); 737 out_remove_new: 738 bus_remove_file(&pata_parport_bus_type, &bus_attr_new_device); 739 out_unregister_dev: 740 device_unregister(&pata_parport_bus); 741 out_unregister_bus: 742 bus_unregister(&pata_parport_bus_type); 743 return error; 744 } 745 746 static __exit void pata_parport_exit(void) 747 { 748 parport_unregister_driver(&pata_parport_driver); 749 bus_remove_file(&pata_parport_bus_type, &bus_attr_new_device); 750 bus_remove_file(&pata_parport_bus_type, &bus_attr_delete_device); 751 device_unregister(&pata_parport_bus); 752 bus_unregister(&pata_parport_bus_type); 753 } 754 755 MODULE_AUTHOR("Ondrej Zary"); 756 MODULE_DESCRIPTION("driver for parallel port ATA adapters"); 757 MODULE_LICENSE("GPL"); 758 MODULE_ALIAS("paride"); 759 760 module_init(pata_parport_init); 761 module_exit(pata_parport_exit); 762