1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2006 IronPort Systems 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/ctype.h> 32 #include <sys/kernel.h> 33 #include <sys/malloc.h> 34 #include <sys/mount.h> 35 #include <sys/sbuf.h> 36 #include <sys/smp.h> 37 #include <sys/bus.h> 38 #include <sys/pciio.h> 39 40 #include <dev/pci/pcivar.h> 41 #include <dev/pci/pcireg.h> 42 43 #include <compat/linux/linux_util.h> 44 #include <fs/pseudofs/pseudofs.h> 45 46 #include <compat/linsysfs/linsysfs.h> 47 48 MALLOC_DEFINE(M_LINSYSFS, "linsysfs", "Linsysfs structures"); 49 50 struct scsi_host_queue { 51 TAILQ_ENTRY(scsi_host_queue) scsi_host_next; 52 char *path; 53 char *name; 54 }; 55 56 TAILQ_HEAD(,scsi_host_queue) scsi_host_q; 57 58 static int host_number = 0; 59 60 static int 61 atoi(const char *str) 62 { 63 return (int)strtol(str, (char **)NULL, 10); 64 } 65 66 /* 67 * Filler function for proc_name 68 */ 69 static int 70 linsysfs_scsiname(PFS_FILL_ARGS) 71 { 72 struct scsi_host_queue *scsi_host; 73 int index; 74 75 if (strncmp(pn->pn_parent->pn_name, "host", 4) == 0) { 76 index = atoi(&pn->pn_parent->pn_name[4]); 77 } else { 78 sbuf_printf(sb, "unknown\n"); 79 return (0); 80 } 81 TAILQ_FOREACH(scsi_host, &scsi_host_q, scsi_host_next) { 82 if (index-- == 0) { 83 sbuf_printf(sb, "%s\n", scsi_host->name); 84 return (0); 85 } 86 } 87 sbuf_printf(sb, "unknown\n"); 88 return (0); 89 } 90 91 /* 92 * Filler function for device sym-link 93 */ 94 static int 95 linsysfs_link_scsi_host(PFS_FILL_ARGS) 96 { 97 struct scsi_host_queue *scsi_host; 98 int index; 99 100 if (strncmp(pn->pn_parent->pn_name, "host", 4) == 0) { 101 index = atoi(&pn->pn_parent->pn_name[4]); 102 } else { 103 sbuf_printf(sb, "unknown\n"); 104 return (0); 105 } 106 TAILQ_FOREACH(scsi_host, &scsi_host_q, scsi_host_next) { 107 if (index-- == 0) { 108 sbuf_printf(sb, "../../../devices%s", scsi_host->path); 109 return(0); 110 } 111 } 112 sbuf_printf(sb, "unknown\n"); 113 return (0); 114 } 115 116 static int 117 linsysfs_fill_data(PFS_FILL_ARGS) 118 { 119 sbuf_printf(sb, "%s", (char *)pn->pn_data); 120 return (0); 121 } 122 123 static int 124 linsysfs_fill_vendor(PFS_FILL_ARGS) 125 { 126 sbuf_printf(sb, "0x%04x\n", pci_get_vendor((device_t)pn->pn_data)); 127 return (0); 128 } 129 130 static int 131 linsysfs_fill_device(PFS_FILL_ARGS) 132 { 133 sbuf_printf(sb, "0x%04x\n", pci_get_device((device_t)pn->pn_data)); 134 return (0); 135 } 136 137 static int 138 linsysfs_fill_subvendor(PFS_FILL_ARGS) 139 { 140 sbuf_printf(sb, "0x%04x\n", pci_get_subvendor((device_t)pn->pn_data)); 141 return (0); 142 } 143 144 static int 145 linsysfs_fill_subdevice(PFS_FILL_ARGS) 146 { 147 sbuf_printf(sb, "0x%04x\n", pci_get_subdevice((device_t)pn->pn_data)); 148 return (0); 149 } 150 151 static int 152 linsysfs_fill_revid(PFS_FILL_ARGS) 153 { 154 sbuf_printf(sb, "0x%x\n", pci_get_revid((device_t)pn->pn_data)); 155 return (0); 156 } 157 158 static int 159 linsysfs_fill_config(PFS_FILL_ARGS) 160 { 161 uint8_t config[48]; 162 device_t dev; 163 uint32_t reg; 164 165 dev = (device_t)pn->pn_data; 166 bzero(config, sizeof(config)); 167 reg = pci_get_vendor(dev); 168 config[0] = reg; 169 config[1] = reg >> 8; 170 reg = pci_get_device(dev); 171 config[2] = reg; 172 config[3] = reg >> 8; 173 reg = pci_get_revid(dev); 174 config[8] = reg; 175 reg = pci_get_subvendor(dev); 176 config[44] = reg; 177 config[45] = reg >> 8; 178 reg = pci_get_subdevice(dev); 179 config[46] = reg; 180 config[47] = reg >> 8; 181 sbuf_bcat(sb, config, sizeof(config)); 182 return (0); 183 } 184 185 /* 186 * Filler function for PCI uevent file 187 */ 188 static int 189 linsysfs_fill_uevent_pci(PFS_FILL_ARGS) 190 { 191 device_t dev; 192 193 dev = (device_t)pn->pn_data; 194 sbuf_printf(sb, "DRIVER=%s\nPCI_CLASS=%X\nPCI_ID=%04X:%04X\n" 195 "PCI_SUBSYS_ID=%04X:%04X\nPCI_SLOT_NAME=%04d:%02x:%02x.%x\n", 196 linux_driver_get_name_dev(dev), pci_get_class(dev), 197 pci_get_vendor(dev), pci_get_device(dev), pci_get_subvendor(dev), 198 pci_get_subdevice(dev), pci_get_domain(dev), pci_get_bus(dev), 199 pci_get_slot(dev), pci_get_function(dev)); 200 return (0); 201 } 202 203 /* Linux DRM render nodes start at minor 128. */ 204 #define DRM_RENDER_MINOR_BASE 128 205 206 /* 207 * Filler function for drm uevent file 208 */ 209 static int 210 linsysfs_fill_uevent_drm(PFS_FILL_ARGS) 211 { 212 device_t dev; 213 int unit; 214 215 dev = (device_t)pn->pn_data; 216 unit = device_get_unit(dev); 217 sbuf_printf(sb, 218 "MAJOR=226\nMINOR=%d\nDEVNAME=dri/card%d\nDEVTYPE=dri_minor\n", 219 unit, unit); 220 return (0); 221 } 222 223 static int 224 linsysfs_fill_uevent_drm_render(PFS_FILL_ARGS) 225 { 226 device_t dev; 227 int unit; 228 229 dev = (device_t)pn->pn_data; 230 unit = device_get_unit(dev); 231 sbuf_printf(sb, "MAJOR=226\nMINOR=%d\nDEVNAME=dri/renderD%d\n", 232 unit + DRM_RENDER_MINOR_BASE, unit + DRM_RENDER_MINOR_BASE); 233 return (0); 234 } 235 236 static char * 237 get_full_pfs_path(struct pfs_node *cur) 238 { 239 char *temp, *path; 240 241 temp = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 242 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 243 path[0] = '\0'; 244 245 do { 246 snprintf(temp, MAXPATHLEN, "%s/%s", cur->pn_name, path); 247 strlcpy(path, temp, MAXPATHLEN); 248 cur = cur->pn_parent; 249 } while (cur->pn_parent != NULL); 250 251 path[strlen(path) - 1] = '\0'; /* remove extra slash */ 252 free(temp, M_TEMP); 253 return (path); 254 } 255 256 /* 257 * Filler function for symlink from drm char device to PCI device 258 */ 259 static int 260 linsysfs_fill_vgapci(PFS_FILL_ARGS) 261 { 262 char *path; 263 264 path = get_full_pfs_path((struct pfs_node*)pn->pn_data); 265 sbuf_printf(sb, "../../../%s", path); 266 free(path, M_TEMP); 267 return (0); 268 } 269 270 #undef PCI_DEV 271 #define PCI_DEV "pci" 272 #define DRMN_DEV "drmn" 273 static int 274 linsysfs_run_bus(device_t dev, struct pfs_node *dir, struct pfs_node *scsi, 275 struct pfs_node *chardev, struct pfs_node *drm, char *path, char *prefix) 276 { 277 struct scsi_host_queue *scsi_host; 278 struct pfs_node *sub_dir, *cur_file, *drm_dir, *drm_minor; 279 int i, nchildren, error; 280 device_t *children, parent; 281 devclass_t devclass; 282 const char *name = NULL; 283 struct pci_devinfo *dinfo; 284 char *device, *host, *new_path, *devname; 285 286 children = NULL; 287 device = host = NULL; 288 new_path = path; 289 devname = malloc(16, M_TEMP, M_WAITOK); 290 291 parent = device_get_parent(dev); 292 if (parent) { 293 devclass = device_get_devclass(parent); 294 if (devclass != NULL) 295 name = devclass_get_name(devclass); 296 if (name && strcmp(name, PCI_DEV) == 0) { 297 dinfo = device_get_ivars(dev); 298 if (dinfo) { 299 device = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 300 new_path = malloc(MAXPATHLEN, M_TEMP, 301 M_WAITOK); 302 new_path[0] = '\000'; 303 strcpy(new_path, path); 304 host = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 305 device[0] = '\000'; 306 sprintf(device, "%s:%02x:%02x.%x", 307 prefix, 308 dinfo->cfg.bus, 309 dinfo->cfg.slot, 310 dinfo->cfg.func); 311 strcat(new_path, "/"); 312 strcat(new_path, device); 313 error = pfs_create_dir(dir, &dir, device, 314 NULL, NULL, NULL, 0); 315 if (error != 0) 316 goto out; 317 pfs_create_dir(dir, &dir, device, NULL, NULL, 318 NULL, 0); 319 pfs_create_file(dir, &cur_file, "vendor", 320 &linsysfs_fill_vendor, NULL, NULL, NULL, 321 PFS_RD); 322 cur_file->pn_data = (void*)dev; 323 pfs_create_file(dir, &cur_file, "device", 324 &linsysfs_fill_device, NULL, NULL, NULL, 325 PFS_RD); 326 cur_file->pn_data = (void*)dev; 327 pfs_create_file(dir, &cur_file, 328 "subsystem_vendor", 329 &linsysfs_fill_subvendor, NULL, NULL, NULL, 330 PFS_RD); 331 cur_file->pn_data = (void*)dev; 332 pfs_create_file(dir, &cur_file, 333 "subsystem_device", 334 &linsysfs_fill_subdevice, NULL, NULL, NULL, 335 PFS_RD); 336 cur_file->pn_data = (void*)dev; 337 pfs_create_file(dir, &cur_file, "revision", 338 &linsysfs_fill_revid, NULL, NULL, NULL, 339 PFS_RD); 340 cur_file->pn_data = (void*)dev; 341 pfs_create_file(dir, &cur_file, "config", 342 &linsysfs_fill_config, NULL, NULL, NULL, 343 PFS_RD); 344 cur_file->pn_data = (void*)dev; 345 pfs_create_file(dir, &cur_file, "uevent", 346 &linsysfs_fill_uevent_pci, NULL, NULL, NULL, 347 PFS_RD); 348 cur_file->pn_data = (void*)dev; 349 pfs_create_link(dir, &cur_file, "subsystem", 350 &linsysfs_fill_data, NULL, NULL, NULL, 0); 351 /* libdrm just checks that the link ends in "/pci" */ 352 cur_file->pn_data = "/sys/bus/pci"; 353 354 if (dinfo->cfg.baseclass == PCIC_STORAGE) { 355 /* DJA only make this if needed */ 356 sprintf(host, "host%d", host_number++); 357 strcat(new_path, "/"); 358 strcat(new_path, host); 359 pfs_create_dir(dir, NULL, host, NULL, 360 NULL, NULL, 0); 361 scsi_host = malloc(sizeof( 362 struct scsi_host_queue), 363 M_DEVBUF, M_WAITOK); 364 scsi_host->path = malloc( 365 strlen(new_path) + 1, 366 M_DEVBUF, M_WAITOK); 367 scsi_host->path[0] = '\000'; 368 bcopy(new_path, scsi_host->path, 369 strlen(new_path) + 1); 370 scsi_host->name = "unknown"; 371 372 pfs_create_dir(scsi, &sub_dir, host, 373 NULL, NULL, NULL, 0); 374 pfs_create_link(sub_dir, NULL, "device", 375 &linsysfs_link_scsi_host, NULL, 376 NULL, NULL, 0); 377 pfs_create_file(sub_dir, NULL, 378 "proc_name", &linsysfs_scsiname, 379 NULL, NULL, NULL, PFS_RD); 380 scsi_host->name 381 = linux_driver_get_name_dev(dev); 382 TAILQ_INSERT_TAIL(&scsi_host_q, 383 scsi_host, scsi_host_next); 384 } 385 } 386 } 387 388 devclass = device_get_devclass(dev); 389 if (devclass != NULL) 390 name = devclass_get_name(devclass); 391 else 392 name = NULL; 393 if (name != NULL && strcmp(name, DRMN_DEV) == 0 && 394 device_get_unit(dev) >= 0) { 395 dinfo = device_get_ivars(parent); 396 if (dinfo != NULL && dinfo->cfg.baseclass == PCIC_DISPLAY) { 397 pfs_create_dir(dir, &drm_dir, "drm", NULL, NULL, 398 NULL, 0); 399 sprintf(devname, "226:%d", 400 device_get_unit(dev)); 401 pfs_create_dir(chardev, &sub_dir, devname, NULL, 402 NULL, NULL, 0); 403 pfs_create_link(sub_dir, &cur_file, "device", 404 &linsysfs_fill_vgapci, NULL, NULL, NULL, 405 PFS_RD); 406 cur_file->pn_data = (void*)dir; 407 pfs_create_file(sub_dir, &cur_file, "uevent", 408 &linsysfs_fill_uevent_drm, NULL, NULL, NULL, 409 PFS_RD); 410 cur_file->pn_data = (void*)dev; 411 sprintf(devname, "card%d", 412 device_get_unit(dev)); 413 pfs_create_dir(drm, &sub_dir, devname, NULL, 414 NULL, NULL, 0); 415 pfs_create_link(sub_dir, &cur_file, "device", 416 &linsysfs_fill_vgapci, NULL, NULL, NULL, 417 PFS_RD); 418 cur_file->pn_data = (void*)dir; 419 420 pfs_create_dir(drm_dir, &drm_minor, devname, 421 NULL, NULL, NULL, 0); 422 pfs_create_file(drm_minor, &cur_file, "uevent", 423 &linsysfs_fill_uevent_drm, NULL, NULL, NULL, 424 PFS_RD); 425 cur_file->pn_data = (void *)dev; 426 427 sprintf(devname, "226:%d", 428 device_get_unit(dev) + 429 DRM_RENDER_MINOR_BASE); 430 pfs_create_dir(chardev, &sub_dir, devname, NULL, 431 NULL, NULL, 0); 432 pfs_create_link(sub_dir, &cur_file, "device", 433 &linsysfs_fill_vgapci, NULL, NULL, NULL, 434 PFS_RD); 435 cur_file->pn_data = (void *)dir; 436 pfs_create_file(sub_dir, &cur_file, "uevent", 437 &linsysfs_fill_uevent_drm_render, NULL, 438 NULL, NULL, PFS_RD); 439 cur_file->pn_data = (void *)dev; 440 441 sprintf(devname, "renderD%d", 442 device_get_unit(dev) + 443 DRM_RENDER_MINOR_BASE); 444 pfs_create_dir(drm, &sub_dir, devname, NULL, 445 NULL, NULL, 0); 446 pfs_create_link(sub_dir, &cur_file, "device", 447 &linsysfs_fill_vgapci, NULL, NULL, NULL, 448 PFS_RD); 449 cur_file->pn_data = (void *)dir; 450 451 pfs_create_dir(drm_dir, &drm_minor, devname, 452 NULL, NULL, NULL, 0); 453 pfs_create_file(drm_minor, &cur_file, "uevent", 454 &linsysfs_fill_uevent_drm_render, NULL, 455 NULL, NULL, PFS_RD); 456 cur_file->pn_data = (void *)dev; 457 } 458 } 459 } 460 461 error = device_get_children(dev, &children, &nchildren); 462 if (error == 0) { 463 for (i = 0; i < nchildren; i++) { 464 if (children[i]) { 465 error = linsysfs_run_bus(children[i], dir, scsi, 466 chardev, drm, new_path, prefix); 467 if (error != 0) { 468 printf( 469 "linsysfs_run_bus: %s omitted from sysfs tree, error %d\n", 470 device_get_nameunit(children[i]), 471 error); 472 } 473 } 474 } 475 476 /* 477 * We override the error to avoid cascading failures; the 478 * innermost device that failed in a tree is probably the most 479 * significant one for diagnostics, its parents would be noise. 480 */ 481 error = 0; 482 } 483 484 out: 485 free(host, M_TEMP); 486 free(device, M_TEMP); 487 if (children != NULL) 488 free(children, M_TEMP); 489 if (new_path != path) 490 free(new_path, M_TEMP); 491 free(devname, M_TEMP); 492 493 return (error); 494 } 495 496 /* 497 * Filler function for sys/devices/system/cpu/{online,possible,present} 498 */ 499 static int 500 linsysfs_cpuonline(PFS_FILL_ARGS) 501 { 502 503 sbuf_printf(sb, "%d-%d\n", CPU_FIRST(), mp_maxid); 504 return (0); 505 } 506 507 /* 508 * Filler function for sys/devices/system/cpu/cpuX/online 509 */ 510 static int 511 linsysfs_cpuxonline(PFS_FILL_ARGS) 512 { 513 514 sbuf_printf(sb, "1\n"); 515 return (0); 516 } 517 518 static void 519 linsysfs_listcpus(struct pfs_node *dir) 520 { 521 struct pfs_node *cpu; 522 char *name; 523 int i, count, len; 524 525 len = 1; 526 count = mp_maxcpus; 527 while (count > 10) { 528 count /= 10; 529 len++; 530 } 531 len += sizeof("cpu"); 532 name = malloc(len, M_TEMP, M_WAITOK); 533 534 for (i = 0; i < mp_ncpus; ++i) { 535 /* /sys/devices/system/cpu/cpuX */ 536 sprintf(name, "cpu%d", i); 537 pfs_create_dir(dir, &cpu, name, NULL, NULL, NULL, 0); 538 539 pfs_create_file(cpu, NULL, "online", &linsysfs_cpuxonline, NULL, 540 NULL, NULL, PFS_RD); 541 } 542 free(name, M_TEMP); 543 } 544 545 /* 546 * Constructor 547 */ 548 static int 549 linsysfs_init(PFS_INIT_ARGS) 550 { 551 struct pfs_node *root; 552 struct pfs_node *class; 553 struct pfs_node *dir, *sys, *cpu; 554 struct pfs_node *drm; 555 struct pfs_node *pci; 556 struct pfs_node *scsi; 557 struct pfs_node *devdir, *chardev; 558 struct pfs_node *kernel; 559 devclass_t devclass; 560 device_t dev; 561 562 TAILQ_INIT(&scsi_host_q); 563 564 root = pi->pi_root; 565 566 /* /sys/bus/... */ 567 pfs_create_dir(root, &dir, "bus", NULL, NULL, NULL, 0); 568 569 /* /sys/class/... */ 570 pfs_create_dir(root, &class, "class", NULL, NULL, NULL, 0); 571 pfs_create_dir(class, &scsi, "scsi_host", NULL, NULL, NULL, 0); 572 pfs_create_dir(class, &drm, "drm", NULL, NULL, NULL, 0); 573 pfs_create_dir(class, NULL, "power_supply", NULL, NULL, NULL, 0); 574 575 /* /sys/class/net/.. */ 576 pfs_create_dir(class, &net, "net", NULL, NULL, NULL, 0); 577 578 /* /sys/dev/... */ 579 pfs_create_dir(root, &devdir, "dev", NULL, NULL, NULL, 0); 580 pfs_create_dir(devdir, &chardev, "char", NULL, NULL, NULL, 0); 581 582 /* /sys/devices/... */ 583 pfs_create_dir(root, &dir, "devices", NULL, NULL, NULL, 0); 584 pfs_create_dir(dir, &pci, "pci0000:00", NULL, NULL, NULL, 0); 585 586 devclass = devclass_find("root"); 587 if (devclass == NULL) { 588 return (0); 589 } 590 591 /* 592 * This assumes that the root node is unlikely to error out in 593 * linsysfs_run_bus, which may or may not be true. 594 */ 595 dev = devclass_get_device(devclass, 0); 596 linsysfs_run_bus(dev, pci, scsi, chardev, drm, "/pci0000:00", "0000"); 597 598 /* /sys/devices/system */ 599 pfs_create_dir(dir, &sys, "system", NULL, NULL, NULL, 0); 600 601 /* /sys/devices/system/cpu */ 602 pfs_create_dir(sys, &cpu, "cpu", NULL, NULL, NULL, 0); 603 604 pfs_create_file(cpu, NULL, "online", &linsysfs_cpuonline, NULL, NULL, 605 NULL, PFS_RD); 606 pfs_create_file(cpu, NULL, "possible", &linsysfs_cpuonline, NULL, NULL, 607 NULL, PFS_RD); 608 pfs_create_file(cpu, NULL, "present", &linsysfs_cpuonline, NULL, NULL, 609 NULL, PFS_RD); 610 611 linsysfs_listcpus(cpu); 612 613 /* /sys/kernel */ 614 pfs_create_dir(root, &kernel, "kernel", NULL, NULL, NULL, 0); 615 /* /sys/kernel/debug, mountpoint for lindebugfs. */ 616 pfs_create_dir(kernel, NULL, "debug", NULL, NULL, NULL, 0); 617 618 linsysfs_net_init(); 619 620 return (0); 621 } 622 623 /* 624 * Destructor 625 */ 626 static int 627 linsysfs_uninit(PFS_INIT_ARGS) 628 { 629 struct scsi_host_queue *scsi_host, *scsi_host_tmp; 630 631 TAILQ_FOREACH_SAFE(scsi_host, &scsi_host_q, scsi_host_next, 632 scsi_host_tmp) { 633 TAILQ_REMOVE(&scsi_host_q, scsi_host, scsi_host_next); 634 free(scsi_host->path, M_TEMP); 635 free(scsi_host, M_TEMP); 636 } 637 638 linsysfs_net_uninit(); 639 640 return (0); 641 } 642 643 PSEUDOFS(linsysfs, 1, VFCF_JAIL); 644 #if defined(__aarch64__) || defined(__amd64__) 645 MODULE_DEPEND(linsysfs, linux_common, 1, 1, 1); 646 #else 647 MODULE_DEPEND(linsysfs, linux, 1, 1, 1); 648 #endif 649