| 1 | /* |
| 2 | * drivers/base/core.c - core driver model code (device registration, etc) |
| 3 | * |
| 4 | * Copyright (c) 2002-3 Patrick Mochel |
| 5 | * Copyright (c) 2002-3 Open Source Development Labs |
| 6 | * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> |
| 7 | * Copyright (c) 2006 Novell, Inc. |
| 8 | * |
| 9 | * This file is released under the GPLv2 |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #include <linux/device.h> |
| 14 | #include <linux/err.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/string.h> |
| 19 | #include <linux/kdev_t.h> |
| 20 | #include <linux/notifier.h> |
| 21 | #include <linux/of.h> |
| 22 | #include <linux/of_device.h> |
| 23 | #include <linux/genhd.h> |
| 24 | #include <linux/kallsyms.h> |
| 25 | #include <linux/mutex.h> |
| 26 | #include <linux/async.h> |
| 27 | #include <linux/pm_runtime.h> |
| 28 | #include <linux/netdevice.h> |
| 29 | |
| 30 | #include "base.h" |
| 31 | #include "power/power.h" |
| 32 | |
| 33 | #ifdef CONFIG_SYSFS_DEPRECATED |
| 34 | #ifdef CONFIG_SYSFS_DEPRECATED_V2 |
| 35 | long sysfs_deprecated = 1; |
| 36 | #else |
| 37 | long sysfs_deprecated = 0; |
| 38 | #endif |
| 39 | static __init int sysfs_deprecated_setup(char *arg) |
| 40 | { |
| 41 | return strict_strtol(arg, 10, &sysfs_deprecated); |
| 42 | } |
| 43 | early_param("sysfs.deprecated", sysfs_deprecated_setup); |
| 44 | #endif |
| 45 | |
| 46 | int (*platform_notify)(struct device *dev) = NULL; |
| 47 | int (*platform_notify_remove)(struct device *dev) = NULL; |
| 48 | static struct kobject *dev_kobj; |
| 49 | struct kobject *sysfs_dev_char_kobj; |
| 50 | struct kobject *sysfs_dev_block_kobj; |
| 51 | |
| 52 | #ifdef CONFIG_BLOCK |
| 53 | static inline int device_is_not_partition(struct device *dev) |
| 54 | { |
| 55 | return !(dev->type == &part_type); |
| 56 | } |
| 57 | #else |
| 58 | static inline int device_is_not_partition(struct device *dev) |
| 59 | { |
| 60 | return 1; |
| 61 | } |
| 62 | #endif |
| 63 | |
| 64 | /** |
| 65 | * dev_driver_string - Return a device's driver name, if at all possible |
| 66 | * @dev: struct device to get the name of |
| 67 | * |
| 68 | * Will return the device's driver's name if it is bound to a device. If |
| 69 | * the device is not bound to a driver, it will return the name of the bus |
| 70 | * it is attached to. If it is not attached to a bus either, an empty |
| 71 | * string will be returned. |
| 72 | */ |
| 73 | const char *dev_driver_string(const struct device *dev) |
| 74 | { |
| 75 | struct device_driver *drv; |
| 76 | |
| 77 | /* dev->driver can change to NULL underneath us because of unbinding, |
| 78 | * so be careful about accessing it. dev->bus and dev->class should |
| 79 | * never change once they are set, so they don't need special care. |
| 80 | */ |
| 81 | drv = ACCESS_ONCE(dev->driver); |
| 82 | return drv ? drv->name : |
| 83 | (dev->bus ? dev->bus->name : |
| 84 | (dev->class ? dev->class->name : "")); |
| 85 | } |
| 86 | EXPORT_SYMBOL(dev_driver_string); |
| 87 | |
| 88 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) |
| 89 | |
| 90 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
| 91 | char *buf) |
| 92 | { |
| 93 | struct device_attribute *dev_attr = to_dev_attr(attr); |
| 94 | struct device *dev = kobj_to_dev(kobj); |
| 95 | ssize_t ret = -EIO; |
| 96 | |
| 97 | if (dev_attr->show) |
| 98 | ret = dev_attr->show(dev, dev_attr, buf); |
| 99 | if (ret >= (ssize_t)PAGE_SIZE) { |
| 100 | print_symbol("dev_attr_show: %s returned bad count\n", |
| 101 | (unsigned long)dev_attr->show); |
| 102 | } |
| 103 | return ret; |
| 104 | } |
| 105 | |
| 106 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
| 107 | const char *buf, size_t count) |
| 108 | { |
| 109 | struct device_attribute *dev_attr = to_dev_attr(attr); |
| 110 | struct device *dev = kobj_to_dev(kobj); |
| 111 | ssize_t ret = -EIO; |
| 112 | |
| 113 | if (dev_attr->store) |
| 114 | ret = dev_attr->store(dev, dev_attr, buf, count); |
| 115 | return ret; |
| 116 | } |
| 117 | |
| 118 | static const struct sysfs_ops dev_sysfs_ops = { |
| 119 | .show = dev_attr_show, |
| 120 | .store = dev_attr_store, |
| 121 | }; |
| 122 | |
| 123 | #define to_ext_attr(x) container_of(x, struct dev_ext_attribute, attr) |
| 124 | |
| 125 | ssize_t device_store_ulong(struct device *dev, |
| 126 | struct device_attribute *attr, |
| 127 | const char *buf, size_t size) |
| 128 | { |
| 129 | struct dev_ext_attribute *ea = to_ext_attr(attr); |
| 130 | char *end; |
| 131 | unsigned long new = simple_strtoul(buf, &end, 0); |
| 132 | if (end == buf) |
| 133 | return -EINVAL; |
| 134 | *(unsigned long *)(ea->var) = new; |
| 135 | /* Always return full write size even if we didn't consume all */ |
| 136 | return size; |
| 137 | } |
| 138 | EXPORT_SYMBOL_GPL(device_store_ulong); |
| 139 | |
| 140 | ssize_t device_show_ulong(struct device *dev, |
| 141 | struct device_attribute *attr, |
| 142 | char *buf) |
| 143 | { |
| 144 | struct dev_ext_attribute *ea = to_ext_attr(attr); |
| 145 | return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var)); |
| 146 | } |
| 147 | EXPORT_SYMBOL_GPL(device_show_ulong); |
| 148 | |
| 149 | ssize_t device_store_int(struct device *dev, |
| 150 | struct device_attribute *attr, |
| 151 | const char *buf, size_t size) |
| 152 | { |
| 153 | struct dev_ext_attribute *ea = to_ext_attr(attr); |
| 154 | char *end; |
| 155 | long new = simple_strtol(buf, &end, 0); |
| 156 | if (end == buf || new > INT_MAX || new < INT_MIN) |
| 157 | return -EINVAL; |
| 158 | *(int *)(ea->var) = new; |
| 159 | /* Always return full write size even if we didn't consume all */ |
| 160 | return size; |
| 161 | } |
| 162 | EXPORT_SYMBOL_GPL(device_store_int); |
| 163 | |
| 164 | ssize_t device_show_int(struct device *dev, |
| 165 | struct device_attribute *attr, |
| 166 | char *buf) |
| 167 | { |
| 168 | struct dev_ext_attribute *ea = to_ext_attr(attr); |
| 169 | |
| 170 | return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var)); |
| 171 | } |
| 172 | EXPORT_SYMBOL_GPL(device_show_int); |
| 173 | |
| 174 | /** |
| 175 | * device_release - free device structure. |
| 176 | * @kobj: device's kobject. |
| 177 | * |
| 178 | * This is called once the reference count for the object |
| 179 | * reaches 0. We forward the call to the device's release |
| 180 | * method, which should handle actually freeing the structure. |
| 181 | */ |
| 182 | static void device_release(struct kobject *kobj) |
| 183 | { |
| 184 | struct device *dev = kobj_to_dev(kobj); |
| 185 | struct device_private *p = dev->p; |
| 186 | |
| 187 | if (dev->release) |
| 188 | dev->release(dev); |
| 189 | else if (dev->type && dev->type->release) |
| 190 | dev->type->release(dev); |
| 191 | else if (dev->class && dev->class->dev_release) |
| 192 | dev->class->dev_release(dev); |
| 193 | else |
| 194 | WARN(1, KERN_ERR "Device '%s' does not have a release() " |
| 195 | "function, it is broken and must be fixed.\n", |
| 196 | dev_name(dev)); |
| 197 | kfree(p); |
| 198 | } |
| 199 | |
| 200 | static const void *device_namespace(struct kobject *kobj) |
| 201 | { |
| 202 | struct device *dev = kobj_to_dev(kobj); |
| 203 | const void *ns = NULL; |
| 204 | |
| 205 | if (dev->class && dev->class->ns_type) |
| 206 | ns = dev->class->namespace(dev); |
| 207 | |
| 208 | return ns; |
| 209 | } |
| 210 | |
| 211 | static struct kobj_type device_ktype = { |
| 212 | .release = device_release, |
| 213 | .sysfs_ops = &dev_sysfs_ops, |
| 214 | .namespace = device_namespace, |
| 215 | }; |
| 216 | |
| 217 | |
| 218 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
| 219 | { |
| 220 | struct kobj_type *ktype = get_ktype(kobj); |
| 221 | |
| 222 | if (ktype == &device_ktype) { |
| 223 | struct device *dev = kobj_to_dev(kobj); |
| 224 | if (dev->bus) |
| 225 | return 1; |
| 226 | if (dev->class) |
| 227 | return 1; |
| 228 | } |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
| 233 | { |
| 234 | struct device *dev = kobj_to_dev(kobj); |
| 235 | |
| 236 | if (dev->bus) |
| 237 | return dev->bus->name; |
| 238 | if (dev->class) |
| 239 | return dev->class->name; |
| 240 | return NULL; |
| 241 | } |
| 242 | |
| 243 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
| 244 | struct kobj_uevent_env *env) |
| 245 | { |
| 246 | struct device *dev = kobj_to_dev(kobj); |
| 247 | int retval = 0; |
| 248 | |
| 249 | /* add device node properties if present */ |
| 250 | if (MAJOR(dev->devt)) { |
| 251 | const char *tmp; |
| 252 | const char *name; |
| 253 | umode_t mode = 0; |
| 254 | |
| 255 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
| 256 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); |
| 257 | name = device_get_devnode(dev, &mode, &tmp); |
| 258 | if (name) { |
| 259 | add_uevent_var(env, "DEVNAME=%s", name); |
| 260 | kfree(tmp); |
| 261 | if (mode) |
| 262 | add_uevent_var(env, "DEVMODE=%#o", mode & 0777); |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | if (dev->type && dev->type->name) |
| 267 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
| 268 | |
| 269 | if (dev->driver) |
| 270 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
| 271 | |
| 272 | /* Add common DT information about the device */ |
| 273 | of_device_uevent(dev, env); |
| 274 | |
| 275 | /* have the bus specific function add its stuff */ |
| 276 | if (dev->bus && dev->bus->uevent) { |
| 277 | retval = dev->bus->uevent(dev, env); |
| 278 | if (retval) |
| 279 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
| 280 | dev_name(dev), __func__, retval); |
| 281 | } |
| 282 | |
| 283 | /* have the class specific function add its stuff */ |
| 284 | if (dev->class && dev->class->dev_uevent) { |
| 285 | retval = dev->class->dev_uevent(dev, env); |
| 286 | if (retval) |
| 287 | pr_debug("device: '%s': %s: class uevent() " |
| 288 | "returned %d\n", dev_name(dev), |
| 289 | __func__, retval); |
| 290 | } |
| 291 | |
| 292 | /* have the device type specific function add its stuff */ |
| 293 | if (dev->type && dev->type->uevent) { |
| 294 | retval = dev->type->uevent(dev, env); |
| 295 | if (retval) |
| 296 | pr_debug("device: '%s': %s: dev_type uevent() " |
| 297 | "returned %d\n", dev_name(dev), |
| 298 | __func__, retval); |
| 299 | } |
| 300 | |
| 301 | return retval; |
| 302 | } |
| 303 | |
| 304 | static const struct kset_uevent_ops device_uevent_ops = { |
| 305 | .filter = dev_uevent_filter, |
| 306 | .name = dev_uevent_name, |
| 307 | .uevent = dev_uevent, |
| 308 | }; |
| 309 | |
| 310 | static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, |
| 311 | char *buf) |
| 312 | { |
| 313 | struct kobject *top_kobj; |
| 314 | struct kset *kset; |
| 315 | struct kobj_uevent_env *env = NULL; |
| 316 | int i; |
| 317 | size_t count = 0; |
| 318 | int retval; |
| 319 | |
| 320 | /* search the kset, the device belongs to */ |
| 321 | top_kobj = &dev->kobj; |
| 322 | while (!top_kobj->kset && top_kobj->parent) |
| 323 | top_kobj = top_kobj->parent; |
| 324 | if (!top_kobj->kset) |
| 325 | goto out; |
| 326 | |
| 327 | kset = top_kobj->kset; |
| 328 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) |
| 329 | goto out; |
| 330 | |
| 331 | /* respect filter */ |
| 332 | if (kset->uevent_ops && kset->uevent_ops->filter) |
| 333 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) |
| 334 | goto out; |
| 335 | |
| 336 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
| 337 | if (!env) |
| 338 | return -ENOMEM; |
| 339 | |
| 340 | /* let the kset specific function add its keys */ |
| 341 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
| 342 | if (retval) |
| 343 | goto out; |
| 344 | |
| 345 | /* copy keys to file */ |
| 346 | for (i = 0; i < env->envp_idx; i++) |
| 347 | count += sprintf(&buf[count], "%s\n", env->envp[i]); |
| 348 | out: |
| 349 | kfree(env); |
| 350 | return count; |
| 351 | } |
| 352 | |
| 353 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
| 354 | const char *buf, size_t count) |
| 355 | { |
| 356 | enum kobject_action action; |
| 357 | |
| 358 | if (kobject_action_type(buf, count, &action) == 0) |
| 359 | kobject_uevent(&dev->kobj, action); |
| 360 | else |
| 361 | dev_err(dev, "uevent: unknown action-string\n"); |
| 362 | return count; |
| 363 | } |
| 364 | |
| 365 | static struct device_attribute uevent_attr = |
| 366 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); |
| 367 | |
| 368 | static int device_add_attributes(struct device *dev, |
| 369 | struct device_attribute *attrs) |
| 370 | { |
| 371 | int error = 0; |
| 372 | int i; |
| 373 | |
| 374 | if (attrs) { |
| 375 | for (i = 0; attr_name(attrs[i]); i++) { |
| 376 | error = device_create_file(dev, &attrs[i]); |
| 377 | if (error) |
| 378 | break; |
| 379 | } |
| 380 | if (error) |
| 381 | while (--i >= 0) |
| 382 | device_remove_file(dev, &attrs[i]); |
| 383 | } |
| 384 | return error; |
| 385 | } |
| 386 | |
| 387 | static void device_remove_attributes(struct device *dev, |
| 388 | struct device_attribute *attrs) |
| 389 | { |
| 390 | int i; |
| 391 | |
| 392 | if (attrs) |
| 393 | for (i = 0; attr_name(attrs[i]); i++) |
| 394 | device_remove_file(dev, &attrs[i]); |
| 395 | } |
| 396 | |
| 397 | static int device_add_bin_attributes(struct device *dev, |
| 398 | struct bin_attribute *attrs) |
| 399 | { |
| 400 | int error = 0; |
| 401 | int i; |
| 402 | |
| 403 | if (attrs) { |
| 404 | for (i = 0; attr_name(attrs[i]); i++) { |
| 405 | error = device_create_bin_file(dev, &attrs[i]); |
| 406 | if (error) |
| 407 | break; |
| 408 | } |
| 409 | if (error) |
| 410 | while (--i >= 0) |
| 411 | device_remove_bin_file(dev, &attrs[i]); |
| 412 | } |
| 413 | return error; |
| 414 | } |
| 415 | |
| 416 | static void device_remove_bin_attributes(struct device *dev, |
| 417 | struct bin_attribute *attrs) |
| 418 | { |
| 419 | int i; |
| 420 | |
| 421 | if (attrs) |
| 422 | for (i = 0; attr_name(attrs[i]); i++) |
| 423 | device_remove_bin_file(dev, &attrs[i]); |
| 424 | } |
| 425 | |
| 426 | static int device_add_groups(struct device *dev, |
| 427 | const struct attribute_group **groups) |
| 428 | { |
| 429 | int error = 0; |
| 430 | int i; |
| 431 | |
| 432 | if (groups) { |
| 433 | for (i = 0; groups[i]; i++) { |
| 434 | error = sysfs_create_group(&dev->kobj, groups[i]); |
| 435 | if (error) { |
| 436 | while (--i >= 0) |
| 437 | sysfs_remove_group(&dev->kobj, |
| 438 | groups[i]); |
| 439 | break; |
| 440 | } |
| 441 | } |
| 442 | } |
| 443 | return error; |
| 444 | } |
| 445 | |
| 446 | static void device_remove_groups(struct device *dev, |
| 447 | const struct attribute_group **groups) |
| 448 | { |
| 449 | int i; |
| 450 | |
| 451 | if (groups) |
| 452 | for (i = 0; groups[i]; i++) |
| 453 | sysfs_remove_group(&dev->kobj, groups[i]); |
| 454 | } |
| 455 | |
| 456 | static int device_add_attrs(struct device *dev) |
| 457 | { |
| 458 | struct class *class = dev->class; |
| 459 | const struct device_type *type = dev->type; |
| 460 | int error; |
| 461 | |
| 462 | if (class) { |
| 463 | error = device_add_attributes(dev, class->dev_attrs); |
| 464 | if (error) |
| 465 | return error; |
| 466 | error = device_add_bin_attributes(dev, class->dev_bin_attrs); |
| 467 | if (error) |
| 468 | goto err_remove_class_attrs; |
| 469 | } |
| 470 | |
| 471 | if (type) { |
| 472 | error = device_add_groups(dev, type->groups); |
| 473 | if (error) |
| 474 | goto err_remove_class_bin_attrs; |
| 475 | } |
| 476 | |
| 477 | error = device_add_groups(dev, dev->groups); |
| 478 | if (error) |
| 479 | goto err_remove_type_groups; |
| 480 | |
| 481 | return 0; |
| 482 | |
| 483 | err_remove_type_groups: |
| 484 | if (type) |
| 485 | device_remove_groups(dev, type->groups); |
| 486 | err_remove_class_bin_attrs: |
| 487 | if (class) |
| 488 | device_remove_bin_attributes(dev, class->dev_bin_attrs); |
| 489 | err_remove_class_attrs: |
| 490 | if (class) |
| 491 | device_remove_attributes(dev, class->dev_attrs); |
| 492 | |
| 493 | return error; |
| 494 | } |
| 495 | |
| 496 | static void device_remove_attrs(struct device *dev) |
| 497 | { |
| 498 | struct class *class = dev->class; |
| 499 | const struct device_type *type = dev->type; |
| 500 | |
| 501 | device_remove_groups(dev, dev->groups); |
| 502 | |
| 503 | if (type) |
| 504 | device_remove_groups(dev, type->groups); |
| 505 | |
| 506 | if (class) { |
| 507 | device_remove_attributes(dev, class->dev_attrs); |
| 508 | device_remove_bin_attributes(dev, class->dev_bin_attrs); |
| 509 | } |
| 510 | } |
| 511 | |
| 512 | |
| 513 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
| 514 | char *buf) |
| 515 | { |
| 516 | return print_dev_t(buf, dev->devt); |
| 517 | } |
| 518 | |
| 519 | static struct device_attribute devt_attr = |
| 520 | __ATTR(dev, S_IRUGO, show_dev, NULL); |
| 521 | |
| 522 | /* /sys/devices/ */ |
| 523 | struct kset *devices_kset; |
| 524 | |
| 525 | /** |
| 526 | * device_create_file - create sysfs attribute file for device. |
| 527 | * @dev: device. |
| 528 | * @attr: device attribute descriptor. |
| 529 | */ |
| 530 | int device_create_file(struct device *dev, |
| 531 | const struct device_attribute *attr) |
| 532 | { |
| 533 | int error = 0; |
| 534 | if (dev) |
| 535 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
| 536 | return error; |
| 537 | } |
| 538 | |
| 539 | /** |
| 540 | * device_remove_file - remove sysfs attribute file. |
| 541 | * @dev: device. |
| 542 | * @attr: device attribute descriptor. |
| 543 | */ |
| 544 | void device_remove_file(struct device *dev, |
| 545 | const struct device_attribute *attr) |
| 546 | { |
| 547 | if (dev) |
| 548 | sysfs_remove_file(&dev->kobj, &attr->attr); |
| 549 | } |
| 550 | |
| 551 | /** |
| 552 | * device_create_bin_file - create sysfs binary attribute file for device. |
| 553 | * @dev: device. |
| 554 | * @attr: device binary attribute descriptor. |
| 555 | */ |
| 556 | int device_create_bin_file(struct device *dev, |
| 557 | const struct bin_attribute *attr) |
| 558 | { |
| 559 | int error = -EINVAL; |
| 560 | if (dev) |
| 561 | error = sysfs_create_bin_file(&dev->kobj, attr); |
| 562 | return error; |
| 563 | } |
| 564 | EXPORT_SYMBOL_GPL(device_create_bin_file); |
| 565 | |
| 566 | /** |
| 567 | * device_remove_bin_file - remove sysfs binary attribute file |
| 568 | * @dev: device. |
| 569 | * @attr: device binary attribute descriptor. |
| 570 | */ |
| 571 | void device_remove_bin_file(struct device *dev, |
| 572 | const struct bin_attribute *attr) |
| 573 | { |
| 574 | if (dev) |
| 575 | sysfs_remove_bin_file(&dev->kobj, attr); |
| 576 | } |
| 577 | EXPORT_SYMBOL_GPL(device_remove_bin_file); |
| 578 | |
| 579 | /** |
| 580 | * device_schedule_callback_owner - helper to schedule a callback for a device |
| 581 | * @dev: device. |
| 582 | * @func: callback function to invoke later. |
| 583 | * @owner: module owning the callback routine |
| 584 | * |
| 585 | * Attribute methods must not unregister themselves or their parent device |
| 586 | * (which would amount to the same thing). Attempts to do so will deadlock, |
| 587 | * since unregistration is mutually exclusive with driver callbacks. |
| 588 | * |
| 589 | * Instead methods can call this routine, which will attempt to allocate |
| 590 | * and schedule a workqueue request to call back @func with @dev as its |
| 591 | * argument in the workqueue's process context. @dev will be pinned until |
| 592 | * @func returns. |
| 593 | * |
| 594 | * This routine is usually called via the inline device_schedule_callback(), |
| 595 | * which automatically sets @owner to THIS_MODULE. |
| 596 | * |
| 597 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
| 598 | * be allocated, -ENODEV if a reference to @owner isn't available. |
| 599 | * |
| 600 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an |
| 601 | * underlying sysfs routine (since it is intended for use by attribute |
| 602 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. |
| 603 | */ |
| 604 | int device_schedule_callback_owner(struct device *dev, |
| 605 | void (*func)(struct device *), struct module *owner) |
| 606 | { |
| 607 | return sysfs_schedule_callback(&dev->kobj, |
| 608 | (void (*)(void *)) func, dev, owner); |
| 609 | } |
| 610 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
| 611 | |
| 612 | static void klist_children_get(struct klist_node *n) |
| 613 | { |
| 614 | struct device_private *p = to_device_private_parent(n); |
| 615 | struct device *dev = p->device; |
| 616 | |
| 617 | get_device(dev); |
| 618 | } |
| 619 | |
| 620 | static void klist_children_put(struct klist_node *n) |
| 621 | { |
| 622 | struct device_private *p = to_device_private_parent(n); |
| 623 | struct device *dev = p->device; |
| 624 | |
| 625 | put_device(dev); |
| 626 | } |
| 627 | |
| 628 | /** |
| 629 | * device_initialize - init device structure. |
| 630 | * @dev: device. |
| 631 | * |
| 632 | * This prepares the device for use by other layers by initializing |
| 633 | * its fields. |
| 634 | * It is the first half of device_register(), if called by |
| 635 | * that function, though it can also be called separately, so one |
| 636 | * may use @dev's fields. In particular, get_device()/put_device() |
| 637 | * may be used for reference counting of @dev after calling this |
| 638 | * function. |
| 639 | * |
| 640 | * All fields in @dev must be initialized by the caller to 0, except |
| 641 | * for those explicitly set to some other value. The simplest |
| 642 | * approach is to use kzalloc() to allocate the structure containing |
| 643 | * @dev. |
| 644 | * |
| 645 | * NOTE: Use put_device() to give up your reference instead of freeing |
| 646 | * @dev directly once you have called this function. |
| 647 | */ |
| 648 | void device_initialize(struct device *dev) |
| 649 | { |
| 650 | dev->kobj.kset = devices_kset; |
| 651 | kobject_init(&dev->kobj, &device_ktype); |
| 652 | INIT_LIST_HEAD(&dev->dma_pools); |
| 653 | mutex_init(&dev->mutex); |
| 654 | lockdep_set_novalidate_class(&dev->mutex); |
| 655 | spin_lock_init(&dev->devres_lock); |
| 656 | INIT_LIST_HEAD(&dev->devres_head); |
| 657 | device_pm_init(dev); |
| 658 | set_dev_node(dev, -1); |
| 659 | } |
| 660 | |
| 661 | static struct kobject *virtual_device_parent(struct device *dev) |
| 662 | { |
| 663 | static struct kobject *virtual_dir = NULL; |
| 664 | |
| 665 | if (!virtual_dir) |
| 666 | virtual_dir = kobject_create_and_add("virtual", |
| 667 | &devices_kset->kobj); |
| 668 | |
| 669 | return virtual_dir; |
| 670 | } |
| 671 | |
| 672 | struct class_dir { |
| 673 | struct kobject kobj; |
| 674 | struct class *class; |
| 675 | }; |
| 676 | |
| 677 | #define to_class_dir(obj) container_of(obj, struct class_dir, kobj) |
| 678 | |
| 679 | static void class_dir_release(struct kobject *kobj) |
| 680 | { |
| 681 | struct class_dir *dir = to_class_dir(kobj); |
| 682 | kfree(dir); |
| 683 | } |
| 684 | |
| 685 | static const |
| 686 | struct kobj_ns_type_operations *class_dir_child_ns_type(struct kobject *kobj) |
| 687 | { |
| 688 | struct class_dir *dir = to_class_dir(kobj); |
| 689 | return dir->class->ns_type; |
| 690 | } |
| 691 | |
| 692 | static struct kobj_type class_dir_ktype = { |
| 693 | .release = class_dir_release, |
| 694 | .sysfs_ops = &kobj_sysfs_ops, |
| 695 | .child_ns_type = class_dir_child_ns_type |
| 696 | }; |
| 697 | |
| 698 | static struct kobject * |
| 699 | class_dir_create_and_add(struct class *class, struct kobject *parent_kobj) |
| 700 | { |
| 701 | struct class_dir *dir; |
| 702 | int retval; |
| 703 | |
| 704 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); |
| 705 | if (!dir) |
| 706 | return NULL; |
| 707 | |
| 708 | dir->class = class; |
| 709 | kobject_init(&dir->kobj, &class_dir_ktype); |
| 710 | |
| 711 | dir->kobj.kset = &class->p->glue_dirs; |
| 712 | |
| 713 | retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name); |
| 714 | if (retval < 0) { |
| 715 | kobject_put(&dir->kobj); |
| 716 | return NULL; |
| 717 | } |
| 718 | return &dir->kobj; |
| 719 | } |
| 720 | |
| 721 | |
| 722 | static struct kobject *get_device_parent(struct device *dev, |
| 723 | struct device *parent) |
| 724 | { |
| 725 | if (dev->class) { |
| 726 | static DEFINE_MUTEX(gdp_mutex); |
| 727 | struct kobject *kobj = NULL; |
| 728 | struct kobject *parent_kobj; |
| 729 | struct kobject *k; |
| 730 | |
| 731 | #ifdef CONFIG_BLOCK |
| 732 | /* block disks show up in /sys/block */ |
| 733 | if (sysfs_deprecated && dev->class == &block_class) { |
| 734 | if (parent && parent->class == &block_class) |
| 735 | return &parent->kobj; |
| 736 | return &block_class.p->subsys.kobj; |
| 737 | } |
| 738 | #endif |
| 739 | |
| 740 | /* |
| 741 | * If we have no parent, we live in "virtual". |
| 742 | * Class-devices with a non class-device as parent, live |
| 743 | * in a "glue" directory to prevent namespace collisions. |
| 744 | */ |
| 745 | if (parent == NULL) |
| 746 | parent_kobj = virtual_device_parent(dev); |
| 747 | else if (parent->class && !dev->class->ns_type) |
| 748 | return &parent->kobj; |
| 749 | else |
| 750 | parent_kobj = &parent->kobj; |
| 751 | |
| 752 | mutex_lock(&gdp_mutex); |
| 753 | |
| 754 | /* find our class-directory at the parent and reference it */ |
| 755 | spin_lock(&dev->class->p->glue_dirs.list_lock); |
| 756 | list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry) |
| 757 | if (k->parent == parent_kobj) { |
| 758 | kobj = kobject_get(k); |
| 759 | break; |
| 760 | } |
| 761 | spin_unlock(&dev->class->p->glue_dirs.list_lock); |
| 762 | if (kobj) { |
| 763 | mutex_unlock(&gdp_mutex); |
| 764 | return kobj; |
| 765 | } |
| 766 | |
| 767 | /* or create a new class-directory at the parent device */ |
| 768 | k = class_dir_create_and_add(dev->class, parent_kobj); |
| 769 | /* do not emit an uevent for this simple "glue" directory */ |
| 770 | mutex_unlock(&gdp_mutex); |
| 771 | return k; |
| 772 | } |
| 773 | |
| 774 | /* subsystems can specify a default root directory for their devices */ |
| 775 | if (!parent && dev->bus && dev->bus->dev_root) |
| 776 | return &dev->bus->dev_root->kobj; |
| 777 | |
| 778 | if (parent) |
| 779 | return &parent->kobj; |
| 780 | return NULL; |
| 781 | } |
| 782 | |
| 783 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
| 784 | { |
| 785 | /* see if we live in a "glue" directory */ |
| 786 | if (!glue_dir || !dev->class || |
| 787 | glue_dir->kset != &dev->class->p->glue_dirs) |
| 788 | return; |
| 789 | |
| 790 | kobject_put(glue_dir); |
| 791 | } |
| 792 | |
| 793 | static void cleanup_device_parent(struct device *dev) |
| 794 | { |
| 795 | cleanup_glue_dir(dev, dev->kobj.parent); |
| 796 | } |
| 797 | |
| 798 | static int device_add_class_symlinks(struct device *dev) |
| 799 | { |
| 800 | int error; |
| 801 | |
| 802 | if (!dev->class) |
| 803 | return 0; |
| 804 | |
| 805 | error = sysfs_create_link(&dev->kobj, |
| 806 | &dev->class->p->subsys.kobj, |
| 807 | "subsystem"); |
| 808 | if (error) |
| 809 | goto out; |
| 810 | |
| 811 | if (dev->parent && device_is_not_partition(dev)) { |
| 812 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
| 813 | "device"); |
| 814 | if (error) |
| 815 | goto out_subsys; |
| 816 | } |
| 817 | |
| 818 | #ifdef CONFIG_BLOCK |
| 819 | /* /sys/block has directories and does not need symlinks */ |
| 820 | if (sysfs_deprecated && dev->class == &block_class) |
| 821 | return 0; |
| 822 | #endif |
| 823 | |
| 824 | /* link in the class directory pointing to the device */ |
| 825 | error = sysfs_create_link(&dev->class->p->subsys.kobj, |
| 826 | &dev->kobj, dev_name(dev)); |
| 827 | if (error) |
| 828 | goto out_device; |
| 829 | |
| 830 | return 0; |
| 831 | |
| 832 | out_device: |
| 833 | sysfs_remove_link(&dev->kobj, "device"); |
| 834 | |
| 835 | out_subsys: |
| 836 | sysfs_remove_link(&dev->kobj, "subsystem"); |
| 837 | out: |
| 838 | return error; |
| 839 | } |
| 840 | |
| 841 | static void device_remove_class_symlinks(struct device *dev) |
| 842 | { |
| 843 | if (!dev->class) |
| 844 | return; |
| 845 | |
| 846 | if (dev->parent && device_is_not_partition(dev)) |
| 847 | sysfs_remove_link(&dev->kobj, "device"); |
| 848 | sysfs_remove_link(&dev->kobj, "subsystem"); |
| 849 | #ifdef CONFIG_BLOCK |
| 850 | if (sysfs_deprecated && dev->class == &block_class) |
| 851 | return; |
| 852 | #endif |
| 853 | sysfs_delete_link(&dev->class->p->subsys.kobj, &dev->kobj, dev_name(dev)); |
| 854 | } |
| 855 | |
| 856 | /** |
| 857 | * dev_set_name - set a device name |
| 858 | * @dev: device |
| 859 | * @fmt: format string for the device's name |
| 860 | */ |
| 861 | int dev_set_name(struct device *dev, const char *fmt, ...) |
| 862 | { |
| 863 | va_list vargs; |
| 864 | int err; |
| 865 | |
| 866 | va_start(vargs, fmt); |
| 867 | err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); |
| 868 | va_end(vargs); |
| 869 | return err; |
| 870 | } |
| 871 | EXPORT_SYMBOL_GPL(dev_set_name); |
| 872 | |
| 873 | /** |
| 874 | * device_to_dev_kobj - select a /sys/dev/ directory for the device |
| 875 | * @dev: device |
| 876 | * |
| 877 | * By default we select char/ for new entries. Setting class->dev_obj |
| 878 | * to NULL prevents an entry from being created. class->dev_kobj must |
| 879 | * be set (or cleared) before any devices are registered to the class |
| 880 | * otherwise device_create_sys_dev_entry() and |
| 881 | * device_remove_sys_dev_entry() will disagree about the presence of |
| 882 | * the link. |
| 883 | */ |
| 884 | static struct kobject *device_to_dev_kobj(struct device *dev) |
| 885 | { |
| 886 | struct kobject *kobj; |
| 887 | |
| 888 | if (dev->class) |
| 889 | kobj = dev->class->dev_kobj; |
| 890 | else |
| 891 | kobj = sysfs_dev_char_kobj; |
| 892 | |
| 893 | return kobj; |
| 894 | } |
| 895 | |
| 896 | static int device_create_sys_dev_entry(struct device *dev) |
| 897 | { |
| 898 | struct kobject *kobj = device_to_dev_kobj(dev); |
| 899 | int error = 0; |
| 900 | char devt_str[15]; |
| 901 | |
| 902 | if (kobj) { |
| 903 | format_dev_t(devt_str, dev->devt); |
| 904 | error = sysfs_create_link(kobj, &dev->kobj, devt_str); |
| 905 | } |
| 906 | |
| 907 | return error; |
| 908 | } |
| 909 | |
| 910 | static void device_remove_sys_dev_entry(struct device *dev) |
| 911 | { |
| 912 | struct kobject *kobj = device_to_dev_kobj(dev); |
| 913 | char devt_str[15]; |
| 914 | |
| 915 | if (kobj) { |
| 916 | format_dev_t(devt_str, dev->devt); |
| 917 | sysfs_remove_link(kobj, devt_str); |
| 918 | } |
| 919 | } |
| 920 | |
| 921 | int device_private_init(struct device *dev) |
| 922 | { |
| 923 | dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); |
| 924 | if (!dev->p) |
| 925 | return -ENOMEM; |
| 926 | dev->p->device = dev; |
| 927 | klist_init(&dev->p->klist_children, klist_children_get, |
| 928 | klist_children_put); |
| 929 | INIT_LIST_HEAD(&dev->p->deferred_probe); |
| 930 | return 0; |
| 931 | } |
| 932 | |
| 933 | /** |
| 934 | * device_add - add device to device hierarchy. |
| 935 | * @dev: device. |
| 936 | * |
| 937 | * This is part 2 of device_register(), though may be called |
| 938 | * separately _iff_ device_initialize() has been called separately. |
| 939 | * |
| 940 | * This adds @dev to the kobject hierarchy via kobject_add(), adds it |
| 941 | * to the global and sibling lists for the device, then |
| 942 | * adds it to the other relevant subsystems of the driver model. |
| 943 | * |
| 944 | * Do not call this routine or device_register() more than once for |
| 945 | * any device structure. The driver model core is not designed to work |
| 946 | * with devices that get unregistered and then spring back to life. |
| 947 | * (Among other things, it's very hard to guarantee that all references |
| 948 | * to the previous incarnation of @dev have been dropped.) Allocate |
| 949 | * and register a fresh new struct device instead. |
| 950 | * |
| 951 | * NOTE: _Never_ directly free @dev after calling this function, even |
| 952 | * if it returned an error! Always use put_device() to give up your |
| 953 | * reference instead. |
| 954 | */ |
| 955 | int device_add(struct device *dev) |
| 956 | { |
| 957 | struct device *parent = NULL; |
| 958 | struct kobject *kobj; |
| 959 | struct class_interface *class_intf; |
| 960 | int error = -EINVAL; |
| 961 | |
| 962 | dev = get_device(dev); |
| 963 | if (!dev) |
| 964 | goto done; |
| 965 | |
| 966 | if (!dev->p) { |
| 967 | error = device_private_init(dev); |
| 968 | if (error) |
| 969 | goto done; |
| 970 | } |
| 971 | |
| 972 | /* |
| 973 | * for statically allocated devices, which should all be converted |
| 974 | * some day, we need to initialize the name. We prevent reading back |
| 975 | * the name, and force the use of dev_name() |
| 976 | */ |
| 977 | if (dev->init_name) { |
| 978 | dev_set_name(dev, "%s", dev->init_name); |
| 979 | dev->init_name = NULL; |
| 980 | } |
| 981 | |
| 982 | /* subsystems can specify simple device enumeration */ |
| 983 | if (!dev_name(dev) && dev->bus && dev->bus->dev_name) |
| 984 | dev_set_name(dev, "%s%u", dev->bus->dev_name, dev->id); |
| 985 | |
| 986 | if (!dev_name(dev)) { |
| 987 | error = -EINVAL; |
| 988 | goto name_error; |
| 989 | } |
| 990 | |
| 991 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
| 992 | |
| 993 | parent = get_device(dev->parent); |
| 994 | kobj = get_device_parent(dev, parent); |
| 995 | if (kobj) |
| 996 | dev->kobj.parent = kobj; |
| 997 | |
| 998 | /* use parent numa_node */ |
| 999 | if (parent) |
| 1000 | set_dev_node(dev, dev_to_node(parent)); |
| 1001 | |
| 1002 | /* first, register with generic layer. */ |
| 1003 | /* we require the name to be set before, and pass NULL */ |
| 1004 | error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); |
| 1005 | if (error) |
| 1006 | goto Error; |
| 1007 | |
| 1008 | /* notify platform of device entry */ |
| 1009 | if (platform_notify) |
| 1010 | platform_notify(dev); |
| 1011 | |
| 1012 | error = device_create_file(dev, &uevent_attr); |
| 1013 | if (error) |
| 1014 | goto attrError; |
| 1015 | |
| 1016 | if (MAJOR(dev->devt)) { |
| 1017 | error = device_create_file(dev, &devt_attr); |
| 1018 | if (error) |
| 1019 | goto ueventattrError; |
| 1020 | |
| 1021 | error = device_create_sys_dev_entry(dev); |
| 1022 | if (error) |
| 1023 | goto devtattrError; |
| 1024 | |
| 1025 | devtmpfs_create_node(dev); |
| 1026 | } |
| 1027 | |
| 1028 | error = device_add_class_symlinks(dev); |
| 1029 | if (error) |
| 1030 | goto SymlinkError; |
| 1031 | error = device_add_attrs(dev); |
| 1032 | if (error) |
| 1033 | goto AttrsError; |
| 1034 | error = bus_add_device(dev); |
| 1035 | if (error) |
| 1036 | goto BusError; |
| 1037 | error = dpm_sysfs_add(dev); |
| 1038 | if (error) |
| 1039 | goto DPMError; |
| 1040 | device_pm_add(dev); |
| 1041 | |
| 1042 | /* Notify clients of device addition. This call must come |
| 1043 | * after dpm_sysfs_add() and before kobject_uevent(). |
| 1044 | */ |
| 1045 | if (dev->bus) |
| 1046 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
| 1047 | BUS_NOTIFY_ADD_DEVICE, dev); |
| 1048 | |
| 1049 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
| 1050 | bus_probe_device(dev); |
| 1051 | if (parent) |
| 1052 | klist_add_tail(&dev->p->knode_parent, |
| 1053 | &parent->p->klist_children); |
| 1054 | |
| 1055 | if (dev->class) { |
| 1056 | mutex_lock(&dev->class->p->mutex); |
| 1057 | /* tie the class to the device */ |
| 1058 | klist_add_tail(&dev->knode_class, |
| 1059 | &dev->class->p->klist_devices); |
| 1060 | |
| 1061 | /* notify any interfaces that the device is here */ |
| 1062 | list_for_each_entry(class_intf, |
| 1063 | &dev->class->p->interfaces, node) |
| 1064 | if (class_intf->add_dev) |
| 1065 | class_intf->add_dev(dev, class_intf); |
| 1066 | mutex_unlock(&dev->class->p->mutex); |
| 1067 | } |
| 1068 | done: |
| 1069 | put_device(dev); |
| 1070 | return error; |
| 1071 | DPMError: |
| 1072 | bus_remove_device(dev); |
| 1073 | BusError: |
| 1074 | device_remove_attrs(dev); |
| 1075 | AttrsError: |
| 1076 | device_remove_class_symlinks(dev); |
| 1077 | SymlinkError: |
| 1078 | if (MAJOR(dev->devt)) |
| 1079 | devtmpfs_delete_node(dev); |
| 1080 | if (MAJOR(dev->devt)) |
| 1081 | device_remove_sys_dev_entry(dev); |
| 1082 | devtattrError: |
| 1083 | if (MAJOR(dev->devt)) |
| 1084 | device_remove_file(dev, &devt_attr); |
| 1085 | ueventattrError: |
| 1086 | device_remove_file(dev, &uevent_attr); |
| 1087 | attrError: |
| 1088 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
| 1089 | kobject_del(&dev->kobj); |
| 1090 | Error: |
| 1091 | cleanup_device_parent(dev); |
| 1092 | if (parent) |
| 1093 | put_device(parent); |
| 1094 | name_error: |
| 1095 | kfree(dev->p); |
| 1096 | dev->p = NULL; |
| 1097 | goto done; |
| 1098 | } |
| 1099 | |
| 1100 | /** |
| 1101 | * device_register - register a device with the system. |
| 1102 | * @dev: pointer to the device structure |
| 1103 | * |
| 1104 | * This happens in two clean steps - initialize the device |
| 1105 | * and add it to the system. The two steps can be called |
| 1106 | * separately, but this is the easiest and most common. |
| 1107 | * I.e. you should only call the two helpers separately if |
| 1108 | * have a clearly defined need to use and refcount the device |
| 1109 | * before it is added to the hierarchy. |
| 1110 | * |
| 1111 | * For more information, see the kerneldoc for device_initialize() |
| 1112 | * and device_add(). |
| 1113 | * |
| 1114 | * NOTE: _Never_ directly free @dev after calling this function, even |
| 1115 | * if it returned an error! Always use put_device() to give up the |
| 1116 | * reference initialized in this function instead. |
| 1117 | */ |
| 1118 | int device_register(struct device *dev) |
| 1119 | { |
| 1120 | device_initialize(dev); |
| 1121 | return device_add(dev); |
| 1122 | } |
| 1123 | |
| 1124 | /** |
| 1125 | * get_device - increment reference count for device. |
| 1126 | * @dev: device. |
| 1127 | * |
| 1128 | * This simply forwards the call to kobject_get(), though |
| 1129 | * we do take care to provide for the case that we get a NULL |
| 1130 | * pointer passed in. |
| 1131 | */ |
| 1132 | struct device *get_device(struct device *dev) |
| 1133 | { |
| 1134 | return dev ? kobj_to_dev(kobject_get(&dev->kobj)) : NULL; |
| 1135 | } |
| 1136 | |
| 1137 | /** |
| 1138 | * put_device - decrement reference count. |
| 1139 | * @dev: device in question. |
| 1140 | */ |
| 1141 | void put_device(struct device *dev) |
| 1142 | { |
| 1143 | /* might_sleep(); */ |
| 1144 | if (dev) |
| 1145 | kobject_put(&dev->kobj); |
| 1146 | } |
| 1147 | |
| 1148 | /** |
| 1149 | * device_del - delete device from system. |
| 1150 | * @dev: device. |
| 1151 | * |
| 1152 | * This is the first part of the device unregistration |
| 1153 | * sequence. This removes the device from the lists we control |
| 1154 | * from here, has it removed from the other driver model |
| 1155 | * subsystems it was added to in device_add(), and removes it |
| 1156 | * from the kobject hierarchy. |
| 1157 | * |
| 1158 | * NOTE: this should be called manually _iff_ device_add() was |
| 1159 | * also called manually. |
| 1160 | */ |
| 1161 | void device_del(struct device *dev) |
| 1162 | { |
| 1163 | struct device *parent = dev->parent; |
| 1164 | struct class_interface *class_intf; |
| 1165 | |
| 1166 | /* Notify clients of device removal. This call must come |
| 1167 | * before dpm_sysfs_remove(). |
| 1168 | */ |
| 1169 | if (dev->bus) |
| 1170 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
| 1171 | BUS_NOTIFY_DEL_DEVICE, dev); |
| 1172 | device_pm_remove(dev); |
| 1173 | dpm_sysfs_remove(dev); |
| 1174 | if (parent) |
| 1175 | klist_del(&dev->p->knode_parent); |
| 1176 | if (MAJOR(dev->devt)) { |
| 1177 | devtmpfs_delete_node(dev); |
| 1178 | device_remove_sys_dev_entry(dev); |
| 1179 | device_remove_file(dev, &devt_attr); |
| 1180 | } |
| 1181 | if (dev->class) { |
| 1182 | device_remove_class_symlinks(dev); |
| 1183 | |
| 1184 | mutex_lock(&dev->class->p->mutex); |
| 1185 | /* notify any interfaces that the device is now gone */ |
| 1186 | list_for_each_entry(class_intf, |
| 1187 | &dev->class->p->interfaces, node) |
| 1188 | if (class_intf->remove_dev) |
| 1189 | class_intf->remove_dev(dev, class_intf); |
| 1190 | /* remove the device from the class list */ |
| 1191 | klist_del(&dev->knode_class); |
| 1192 | mutex_unlock(&dev->class->p->mutex); |
| 1193 | } |
| 1194 | device_remove_file(dev, &uevent_attr); |
| 1195 | device_remove_attrs(dev); |
| 1196 | bus_remove_device(dev); |
| 1197 | driver_deferred_probe_del(dev); |
| 1198 | |
| 1199 | /* |
| 1200 | * Some platform devices are driven without driver attached |
| 1201 | * and managed resources may have been acquired. Make sure |
| 1202 | * all resources are released. |
| 1203 | */ |
| 1204 | devres_release_all(dev); |
| 1205 | |
| 1206 | /* Notify the platform of the removal, in case they |
| 1207 | * need to do anything... |
| 1208 | */ |
| 1209 | if (platform_notify_remove) |
| 1210 | platform_notify_remove(dev); |
| 1211 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
| 1212 | cleanup_device_parent(dev); |
| 1213 | kobject_del(&dev->kobj); |
| 1214 | put_device(parent); |
| 1215 | } |
| 1216 | |
| 1217 | /** |
| 1218 | * device_unregister - unregister device from system. |
| 1219 | * @dev: device going away. |
| 1220 | * |
| 1221 | * We do this in two parts, like we do device_register(). First, |
| 1222 | * we remove it from all the subsystems with device_del(), then |
| 1223 | * we decrement the reference count via put_device(). If that |
| 1224 | * is the final reference count, the device will be cleaned up |
| 1225 | * via device_release() above. Otherwise, the structure will |
| 1226 | * stick around until the final reference to the device is dropped. |
| 1227 | */ |
| 1228 | void device_unregister(struct device *dev) |
| 1229 | { |
| 1230 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
| 1231 | device_del(dev); |
| 1232 | put_device(dev); |
| 1233 | } |
| 1234 | |
| 1235 | static struct device *next_device(struct klist_iter *i) |
| 1236 | { |
| 1237 | struct klist_node *n = klist_next(i); |
| 1238 | struct device *dev = NULL; |
| 1239 | struct device_private *p; |
| 1240 | |
| 1241 | if (n) { |
| 1242 | p = to_device_private_parent(n); |
| 1243 | dev = p->device; |
| 1244 | } |
| 1245 | return dev; |
| 1246 | } |
| 1247 | |
| 1248 | /** |
| 1249 | * device_get_devnode - path of device node file |
| 1250 | * @dev: device |
| 1251 | * @mode: returned file access mode |
| 1252 | * @tmp: possibly allocated string |
| 1253 | * |
| 1254 | * Return the relative path of a possible device node. |
| 1255 | * Non-default names may need to allocate a memory to compose |
| 1256 | * a name. This memory is returned in tmp and needs to be |
| 1257 | * freed by the caller. |
| 1258 | */ |
| 1259 | const char *device_get_devnode(struct device *dev, |
| 1260 | umode_t *mode, const char **tmp) |
| 1261 | { |
| 1262 | char *s; |
| 1263 | |
| 1264 | *tmp = NULL; |
| 1265 | |
| 1266 | /* the device type may provide a specific name */ |
| 1267 | if (dev->type && dev->type->devnode) |
| 1268 | *tmp = dev->type->devnode(dev, mode); |
| 1269 | if (*tmp) |
| 1270 | return *tmp; |
| 1271 | |
| 1272 | /* the class may provide a specific name */ |
| 1273 | if (dev->class && dev->class->devnode) |
| 1274 | *tmp = dev->class->devnode(dev, mode); |
| 1275 | if (*tmp) |
| 1276 | return *tmp; |
| 1277 | |
| 1278 | /* return name without allocation, tmp == NULL */ |
| 1279 | if (strchr(dev_name(dev), '!') == NULL) |
| 1280 | return dev_name(dev); |
| 1281 | |
| 1282 | /* replace '!' in the name with '/' */ |
| 1283 | *tmp = kstrdup(dev_name(dev), GFP_KERNEL); |
| 1284 | if (!*tmp) |
| 1285 | return NULL; |
| 1286 | while ((s = strchr(*tmp, '!'))) |
| 1287 | s[0] = '/'; |
| 1288 | return *tmp; |
| 1289 | } |
| 1290 | |
| 1291 | /** |
| 1292 | * device_for_each_child - device child iterator. |
| 1293 | * @parent: parent struct device. |
| 1294 | * @data: data for the callback. |
| 1295 | * @fn: function to be called for each device. |
| 1296 | * |
| 1297 | * Iterate over @parent's child devices, and call @fn for each, |
| 1298 | * passing it @data. |
| 1299 | * |
| 1300 | * We check the return of @fn each time. If it returns anything |
| 1301 | * other than 0, we break out and return that value. |
| 1302 | */ |
| 1303 | int device_for_each_child(struct device *parent, void *data, |
| 1304 | int (*fn)(struct device *dev, void *data)) |
| 1305 | { |
| 1306 | struct klist_iter i; |
| 1307 | struct device *child; |
| 1308 | int error = 0; |
| 1309 | |
| 1310 | if (!parent->p) |
| 1311 | return 0; |
| 1312 | |
| 1313 | klist_iter_init(&parent->p->klist_children, &i); |
| 1314 | while ((child = next_device(&i)) && !error) |
| 1315 | error = fn(child, data); |
| 1316 | klist_iter_exit(&i); |
| 1317 | return error; |
| 1318 | } |
| 1319 | |
| 1320 | /** |
| 1321 | * device_find_child - device iterator for locating a particular device. |
| 1322 | * @parent: parent struct device |
| 1323 | * @data: Data to pass to match function |
| 1324 | * @match: Callback function to check device |
| 1325 | * |
| 1326 | * This is similar to the device_for_each_child() function above, but it |
| 1327 | * returns a reference to a device that is 'found' for later use, as |
| 1328 | * determined by the @match callback. |
| 1329 | * |
| 1330 | * The callback should return 0 if the device doesn't match and non-zero |
| 1331 | * if it does. If the callback returns non-zero and a reference to the |
| 1332 | * current device can be obtained, this function will return to the caller |
| 1333 | * and not iterate over any more devices. |
| 1334 | */ |
| 1335 | struct device *device_find_child(struct device *parent, void *data, |
| 1336 | int (*match)(struct device *dev, void *data)) |
| 1337 | { |
| 1338 | struct klist_iter i; |
| 1339 | struct device *child; |
| 1340 | |
| 1341 | if (!parent) |
| 1342 | return NULL; |
| 1343 | |
| 1344 | klist_iter_init(&parent->p->klist_children, &i); |
| 1345 | while ((child = next_device(&i))) |
| 1346 | if (match(child, data) && get_device(child)) |
| 1347 | break; |
| 1348 | klist_iter_exit(&i); |
| 1349 | return child; |
| 1350 | } |
| 1351 | |
| 1352 | int __init devices_init(void) |
| 1353 | { |
| 1354 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
| 1355 | if (!devices_kset) |
| 1356 | return -ENOMEM; |
| 1357 | dev_kobj = kobject_create_and_add("dev", NULL); |
| 1358 | if (!dev_kobj) |
| 1359 | goto dev_kobj_err; |
| 1360 | sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); |
| 1361 | if (!sysfs_dev_block_kobj) |
| 1362 | goto block_kobj_err; |
| 1363 | sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); |
| 1364 | if (!sysfs_dev_char_kobj) |
| 1365 | goto char_kobj_err; |
| 1366 | |
| 1367 | return 0; |
| 1368 | |
| 1369 | char_kobj_err: |
| 1370 | kobject_put(sysfs_dev_block_kobj); |
| 1371 | block_kobj_err: |
| 1372 | kobject_put(dev_kobj); |
| 1373 | dev_kobj_err: |
| 1374 | kset_unregister(devices_kset); |
| 1375 | return -ENOMEM; |
| 1376 | } |
| 1377 | |
| 1378 | EXPORT_SYMBOL_GPL(device_for_each_child); |
| 1379 | EXPORT_SYMBOL_GPL(device_find_child); |
| 1380 | |
| 1381 | EXPORT_SYMBOL_GPL(device_initialize); |
| 1382 | EXPORT_SYMBOL_GPL(device_add); |
| 1383 | EXPORT_SYMBOL_GPL(device_register); |
| 1384 | |
| 1385 | EXPORT_SYMBOL_GPL(device_del); |
| 1386 | EXPORT_SYMBOL_GPL(device_unregister); |
| 1387 | EXPORT_SYMBOL_GPL(get_device); |
| 1388 | EXPORT_SYMBOL_GPL(put_device); |
| 1389 | |
| 1390 | EXPORT_SYMBOL_GPL(device_create_file); |
| 1391 | EXPORT_SYMBOL_GPL(device_remove_file); |
| 1392 | |
| 1393 | struct root_device { |
| 1394 | struct device dev; |
| 1395 | struct module *owner; |
| 1396 | }; |
| 1397 | |
| 1398 | inline struct root_device *to_root_device(struct device *d) |
| 1399 | { |
| 1400 | return container_of(d, struct root_device, dev); |
| 1401 | } |
| 1402 | |
| 1403 | static void root_device_release(struct device *dev) |
| 1404 | { |
| 1405 | kfree(to_root_device(dev)); |
| 1406 | } |
| 1407 | |
| 1408 | /** |
| 1409 | * __root_device_register - allocate and register a root device |
| 1410 | * @name: root device name |
| 1411 | * @owner: owner module of the root device, usually THIS_MODULE |
| 1412 | * |
| 1413 | * This function allocates a root device and registers it |
| 1414 | * using device_register(). In order to free the returned |
| 1415 | * device, use root_device_unregister(). |
| 1416 | * |
| 1417 | * Root devices are dummy devices which allow other devices |
| 1418 | * to be grouped under /sys/devices. Use this function to |
| 1419 | * allocate a root device and then use it as the parent of |
| 1420 | * any device which should appear under /sys/devices/{name} |
| 1421 | * |
| 1422 | * The /sys/devices/{name} directory will also contain a |
| 1423 | * 'module' symlink which points to the @owner directory |
| 1424 | * in sysfs. |
| 1425 | * |
| 1426 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
| 1427 | * |
| 1428 | * Note: You probably want to use root_device_register(). |
| 1429 | */ |
| 1430 | struct device *__root_device_register(const char *name, struct module *owner) |
| 1431 | { |
| 1432 | struct root_device *root; |
| 1433 | int err = -ENOMEM; |
| 1434 | |
| 1435 | root = kzalloc(sizeof(struct root_device), GFP_KERNEL); |
| 1436 | if (!root) |
| 1437 | return ERR_PTR(err); |
| 1438 | |
| 1439 | err = dev_set_name(&root->dev, "%s", name); |
| 1440 | if (err) { |
| 1441 | kfree(root); |
| 1442 | return ERR_PTR(err); |
| 1443 | } |
| 1444 | |
| 1445 | root->dev.release = root_device_release; |
| 1446 | |
| 1447 | err = device_register(&root->dev); |
| 1448 | if (err) { |
| 1449 | put_device(&root->dev); |
| 1450 | return ERR_PTR(err); |
| 1451 | } |
| 1452 | |
| 1453 | #ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */ |
| 1454 | if (owner) { |
| 1455 | struct module_kobject *mk = &owner->mkobj; |
| 1456 | |
| 1457 | err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); |
| 1458 | if (err) { |
| 1459 | device_unregister(&root->dev); |
| 1460 | return ERR_PTR(err); |
| 1461 | } |
| 1462 | root->owner = owner; |
| 1463 | } |
| 1464 | #endif |
| 1465 | |
| 1466 | return &root->dev; |
| 1467 | } |
| 1468 | EXPORT_SYMBOL_GPL(__root_device_register); |
| 1469 | |
| 1470 | /** |
| 1471 | * root_device_unregister - unregister and free a root device |
| 1472 | * @dev: device going away |
| 1473 | * |
| 1474 | * This function unregisters and cleans up a device that was created by |
| 1475 | * root_device_register(). |
| 1476 | */ |
| 1477 | void root_device_unregister(struct device *dev) |
| 1478 | { |
| 1479 | struct root_device *root = to_root_device(dev); |
| 1480 | |
| 1481 | if (root->owner) |
| 1482 | sysfs_remove_link(&root->dev.kobj, "module"); |
| 1483 | |
| 1484 | device_unregister(dev); |
| 1485 | } |
| 1486 | EXPORT_SYMBOL_GPL(root_device_unregister); |
| 1487 | |
| 1488 | |
| 1489 | static void device_create_release(struct device *dev) |
| 1490 | { |
| 1491 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
| 1492 | kfree(dev); |
| 1493 | } |
| 1494 | |
| 1495 | /** |
| 1496 | * device_create_vargs - creates a device and registers it with sysfs |
| 1497 | * @class: pointer to the struct class that this device should be registered to |
| 1498 | * @parent: pointer to the parent struct device of this new device, if any |
| 1499 | * @devt: the dev_t for the char device to be added |
| 1500 | * @drvdata: the data to be added to the device for callbacks |
| 1501 | * @fmt: string for the device's name |
| 1502 | * @args: va_list for the device's name |
| 1503 | * |
| 1504 | * This function can be used by char device classes. A struct device |
| 1505 | * will be created in sysfs, registered to the specified class. |
| 1506 | * |
| 1507 | * A "dev" file will be created, showing the dev_t for the device, if |
| 1508 | * the dev_t is not 0,0. |
| 1509 | * If a pointer to a parent struct device is passed in, the newly created |
| 1510 | * struct device will be a child of that device in sysfs. |
| 1511 | * The pointer to the struct device will be returned from the call. |
| 1512 | * Any further sysfs files that might be required can be created using this |
| 1513 | * pointer. |
| 1514 | * |
| 1515 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
| 1516 | * |
| 1517 | * Note: the struct class passed to this function must have previously |
| 1518 | * been created with a call to class_create(). |
| 1519 | */ |
| 1520 | struct device *device_create_vargs(struct class *class, struct device *parent, |
| 1521 | dev_t devt, void *drvdata, const char *fmt, |
| 1522 | va_list args) |
| 1523 | { |
| 1524 | struct device *dev = NULL; |
| 1525 | int retval = -ENODEV; |
| 1526 | |
| 1527 | if (class == NULL || IS_ERR(class)) |
| 1528 | goto error; |
| 1529 | |
| 1530 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 1531 | if (!dev) { |
| 1532 | retval = -ENOMEM; |
| 1533 | goto error; |
| 1534 | } |
| 1535 | |
| 1536 | dev->devt = devt; |
| 1537 | dev->class = class; |
| 1538 | dev->parent = parent; |
| 1539 | dev->release = device_create_release; |
| 1540 | dev_set_drvdata(dev, drvdata); |
| 1541 | |
| 1542 | retval = kobject_set_name_vargs(&dev->kobj, fmt, args); |
| 1543 | if (retval) |
| 1544 | goto error; |
| 1545 | |
| 1546 | retval = device_register(dev); |
| 1547 | if (retval) |
| 1548 | goto error; |
| 1549 | |
| 1550 | return dev; |
| 1551 | |
| 1552 | error: |
| 1553 | put_device(dev); |
| 1554 | return ERR_PTR(retval); |
| 1555 | } |
| 1556 | EXPORT_SYMBOL_GPL(device_create_vargs); |
| 1557 | |
| 1558 | /** |
| 1559 | * device_create - creates a device and registers it with sysfs |
| 1560 | * @class: pointer to the struct class that this device should be registered to |
| 1561 | * @parent: pointer to the parent struct device of this new device, if any |
| 1562 | * @devt: the dev_t for the char device to be added |
| 1563 | * @drvdata: the data to be added to the device for callbacks |
| 1564 | * @fmt: string for the device's name |
| 1565 | * |
| 1566 | * This function can be used by char device classes. A struct device |
| 1567 | * will be created in sysfs, registered to the specified class. |
| 1568 | * |
| 1569 | * A "dev" file will be created, showing the dev_t for the device, if |
| 1570 | * the dev_t is not 0,0. |
| 1571 | * If a pointer to a parent struct device is passed in, the newly created |
| 1572 | * struct device will be a child of that device in sysfs. |
| 1573 | * The pointer to the struct device will be returned from the call. |
| 1574 | * Any further sysfs files that might be required can be created using this |
| 1575 | * pointer. |
| 1576 | * |
| 1577 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
| 1578 | * |
| 1579 | * Note: the struct class passed to this function must have previously |
| 1580 | * been created with a call to class_create(). |
| 1581 | */ |
| 1582 | struct device *device_create(struct class *class, struct device *parent, |
| 1583 | dev_t devt, void *drvdata, const char *fmt, ...) |
| 1584 | { |
| 1585 | va_list vargs; |
| 1586 | struct device *dev; |
| 1587 | |
| 1588 | va_start(vargs, fmt); |
| 1589 | dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); |
| 1590 | va_end(vargs); |
| 1591 | return dev; |
| 1592 | } |
| 1593 | EXPORT_SYMBOL_GPL(device_create); |
| 1594 | |
| 1595 | static int __match_devt(struct device *dev, void *data) |
| 1596 | { |
| 1597 | dev_t *devt = data; |
| 1598 | |
| 1599 | return dev->devt == *devt; |
| 1600 | } |
| 1601 | |
| 1602 | /** |
| 1603 | * device_destroy - removes a device that was created with device_create() |
| 1604 | * @class: pointer to the struct class that this device was registered with |
| 1605 | * @devt: the dev_t of the device that was previously registered |
| 1606 | * |
| 1607 | * This call unregisters and cleans up a device that was created with a |
| 1608 | * call to device_create(). |
| 1609 | */ |
| 1610 | void device_destroy(struct class *class, dev_t devt) |
| 1611 | { |
| 1612 | struct device *dev; |
| 1613 | |
| 1614 | dev = class_find_device(class, NULL, &devt, __match_devt); |
| 1615 | if (dev) { |
| 1616 | put_device(dev); |
| 1617 | device_unregister(dev); |
| 1618 | } |
| 1619 | } |
| 1620 | EXPORT_SYMBOL_GPL(device_destroy); |
| 1621 | |
| 1622 | /** |
| 1623 | * device_rename - renames a device |
| 1624 | * @dev: the pointer to the struct device to be renamed |
| 1625 | * @new_name: the new name of the device |
| 1626 | * |
| 1627 | * It is the responsibility of the caller to provide mutual |
| 1628 | * exclusion between two different calls of device_rename |
| 1629 | * on the same device to ensure that new_name is valid and |
| 1630 | * won't conflict with other devices. |
| 1631 | * |
| 1632 | * Note: Don't call this function. Currently, the networking layer calls this |
| 1633 | * function, but that will change. The following text from Kay Sievers offers |
| 1634 | * some insight: |
| 1635 | * |
| 1636 | * Renaming devices is racy at many levels, symlinks and other stuff are not |
| 1637 | * replaced atomically, and you get a "move" uevent, but it's not easy to |
| 1638 | * connect the event to the old and new device. Device nodes are not renamed at |
| 1639 | * all, there isn't even support for that in the kernel now. |
| 1640 | * |
| 1641 | * In the meantime, during renaming, your target name might be taken by another |
| 1642 | * driver, creating conflicts. Or the old name is taken directly after you |
| 1643 | * renamed it -- then you get events for the same DEVPATH, before you even see |
| 1644 | * the "move" event. It's just a mess, and nothing new should ever rely on |
| 1645 | * kernel device renaming. Besides that, it's not even implemented now for |
| 1646 | * other things than (driver-core wise very simple) network devices. |
| 1647 | * |
| 1648 | * We are currently about to change network renaming in udev to completely |
| 1649 | * disallow renaming of devices in the same namespace as the kernel uses, |
| 1650 | * because we can't solve the problems properly, that arise with swapping names |
| 1651 | * of multiple interfaces without races. Means, renaming of eth[0-9]* will only |
| 1652 | * be allowed to some other name than eth[0-9]*, for the aforementioned |
| 1653 | * reasons. |
| 1654 | * |
| 1655 | * Make up a "real" name in the driver before you register anything, or add |
| 1656 | * some other attributes for userspace to find the device, or use udev to add |
| 1657 | * symlinks -- but never rename kernel devices later, it's a complete mess. We |
| 1658 | * don't even want to get into that and try to implement the missing pieces in |
| 1659 | * the core. We really have other pieces to fix in the driver core mess. :) |
| 1660 | */ |
| 1661 | int device_rename(struct device *dev, const char *new_name) |
| 1662 | { |
| 1663 | char *old_class_name = NULL; |
| 1664 | char *new_class_name = NULL; |
| 1665 | char *old_device_name = NULL; |
| 1666 | int error; |
| 1667 | |
| 1668 | dev = get_device(dev); |
| 1669 | if (!dev) |
| 1670 | return -EINVAL; |
| 1671 | |
| 1672 | pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev), |
| 1673 | __func__, new_name); |
| 1674 | |
| 1675 | old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); |
| 1676 | if (!old_device_name) { |
| 1677 | error = -ENOMEM; |
| 1678 | goto out; |
| 1679 | } |
| 1680 | |
| 1681 | if (dev->class) { |
| 1682 | error = sysfs_rename_link(&dev->class->p->subsys.kobj, |
| 1683 | &dev->kobj, old_device_name, new_name); |
| 1684 | if (error) |
| 1685 | goto out; |
| 1686 | } |
| 1687 | |
| 1688 | error = kobject_rename(&dev->kobj, new_name); |
| 1689 | if (error) |
| 1690 | goto out; |
| 1691 | |
| 1692 | out: |
| 1693 | put_device(dev); |
| 1694 | |
| 1695 | kfree(new_class_name); |
| 1696 | kfree(old_class_name); |
| 1697 | kfree(old_device_name); |
| 1698 | |
| 1699 | return error; |
| 1700 | } |
| 1701 | EXPORT_SYMBOL_GPL(device_rename); |
| 1702 | |
| 1703 | static int device_move_class_links(struct device *dev, |
| 1704 | struct device *old_parent, |
| 1705 | struct device *new_parent) |
| 1706 | { |
| 1707 | int error = 0; |
| 1708 | |
| 1709 | if (old_parent) |
| 1710 | sysfs_remove_link(&dev->kobj, "device"); |
| 1711 | if (new_parent) |
| 1712 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, |
| 1713 | "device"); |
| 1714 | return error; |
| 1715 | } |
| 1716 | |
| 1717 | /** |
| 1718 | * device_move - moves a device to a new parent |
| 1719 | * @dev: the pointer to the struct device to be moved |
| 1720 | * @new_parent: the new parent of the device (can by NULL) |
| 1721 | * @dpm_order: how to reorder the dpm_list |
| 1722 | */ |
| 1723 | int device_move(struct device *dev, struct device *new_parent, |
| 1724 | enum dpm_order dpm_order) |
| 1725 | { |
| 1726 | int error; |
| 1727 | struct device *old_parent; |
| 1728 | struct kobject *new_parent_kobj; |
| 1729 | |
| 1730 | dev = get_device(dev); |
| 1731 | if (!dev) |
| 1732 | return -EINVAL; |
| 1733 | |
| 1734 | device_pm_lock(); |
| 1735 | new_parent = get_device(new_parent); |
| 1736 | new_parent_kobj = get_device_parent(dev, new_parent); |
| 1737 | |
| 1738 | pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), |
| 1739 | __func__, new_parent ? dev_name(new_parent) : "<NULL>"); |
| 1740 | error = kobject_move(&dev->kobj, new_parent_kobj); |
| 1741 | if (error) { |
| 1742 | cleanup_glue_dir(dev, new_parent_kobj); |
| 1743 | put_device(new_parent); |
| 1744 | goto out; |
| 1745 | } |
| 1746 | old_parent = dev->parent; |
| 1747 | dev->parent = new_parent; |
| 1748 | if (old_parent) |
| 1749 | klist_remove(&dev->p->knode_parent); |
| 1750 | if (new_parent) { |
| 1751 | klist_add_tail(&dev->p->knode_parent, |
| 1752 | &new_parent->p->klist_children); |
| 1753 | set_dev_node(dev, dev_to_node(new_parent)); |
| 1754 | } |
| 1755 | |
| 1756 | if (dev->class) { |
| 1757 | error = device_move_class_links(dev, old_parent, new_parent); |
| 1758 | if (error) { |
| 1759 | /* We ignore errors on cleanup since we're hosed anyway... */ |
| 1760 | device_move_class_links(dev, new_parent, old_parent); |
| 1761 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { |
| 1762 | if (new_parent) |
| 1763 | klist_remove(&dev->p->knode_parent); |
| 1764 | dev->parent = old_parent; |
| 1765 | if (old_parent) { |
| 1766 | klist_add_tail(&dev->p->knode_parent, |
| 1767 | &old_parent->p->klist_children); |
| 1768 | set_dev_node(dev, dev_to_node(old_parent)); |
| 1769 | } |
| 1770 | } |
| 1771 | cleanup_glue_dir(dev, new_parent_kobj); |
| 1772 | put_device(new_parent); |
| 1773 | goto out; |
| 1774 | } |
| 1775 | } |
| 1776 | switch (dpm_order) { |
| 1777 | case DPM_ORDER_NONE: |
| 1778 | break; |
| 1779 | case DPM_ORDER_DEV_AFTER_PARENT: |
| 1780 | device_pm_move_after(dev, new_parent); |
| 1781 | break; |
| 1782 | case DPM_ORDER_PARENT_BEFORE_DEV: |
| 1783 | device_pm_move_before(new_parent, dev); |
| 1784 | break; |
| 1785 | case DPM_ORDER_DEV_LAST: |
| 1786 | device_pm_move_last(dev); |
| 1787 | break; |
| 1788 | } |
| 1789 | |
| 1790 | put_device(old_parent); |
| 1791 | out: |
| 1792 | device_pm_unlock(); |
| 1793 | put_device(dev); |
| 1794 | return error; |
| 1795 | } |
| 1796 | EXPORT_SYMBOL_GPL(device_move); |
| 1797 | |
| 1798 | /** |
| 1799 | * device_shutdown - call ->shutdown() on each device to shutdown. |
| 1800 | */ |
| 1801 | void device_shutdown(void) |
| 1802 | { |
| 1803 | struct device *dev; |
| 1804 | |
| 1805 | spin_lock(&devices_kset->list_lock); |
| 1806 | /* |
| 1807 | * Walk the devices list backward, shutting down each in turn. |
| 1808 | * Beware that device unplug events may also start pulling |
| 1809 | * devices offline, even as the system is shutting down. |
| 1810 | */ |
| 1811 | while (!list_empty(&devices_kset->list)) { |
| 1812 | dev = list_entry(devices_kset->list.prev, struct device, |
| 1813 | kobj.entry); |
| 1814 | |
| 1815 | /* |
| 1816 | * hold reference count of device's parent to |
| 1817 | * prevent it from being freed because parent's |
| 1818 | * lock is to be held |
| 1819 | */ |
| 1820 | get_device(dev->parent); |
| 1821 | get_device(dev); |
| 1822 | /* |
| 1823 | * Make sure the device is off the kset list, in the |
| 1824 | * event that dev->*->shutdown() doesn't remove it. |
| 1825 | */ |
| 1826 | list_del_init(&dev->kobj.entry); |
| 1827 | spin_unlock(&devices_kset->list_lock); |
| 1828 | |
| 1829 | /* hold lock to avoid race with probe/release */ |
| 1830 | if (dev->parent) |
| 1831 | device_lock(dev->parent); |
| 1832 | device_lock(dev); |
| 1833 | |
| 1834 | /* Don't allow any more runtime suspends */ |
| 1835 | pm_runtime_get_noresume(dev); |
| 1836 | pm_runtime_barrier(dev); |
| 1837 | |
| 1838 | if (dev->bus && dev->bus->shutdown) { |
| 1839 | dev_dbg(dev, "shutdown\n"); |
| 1840 | dev->bus->shutdown(dev); |
| 1841 | } else if (dev->driver && dev->driver->shutdown) { |
| 1842 | dev_dbg(dev, "shutdown\n"); |
| 1843 | dev->driver->shutdown(dev); |
| 1844 | } |
| 1845 | |
| 1846 | device_unlock(dev); |
| 1847 | if (dev->parent) |
| 1848 | device_unlock(dev->parent); |
| 1849 | |
| 1850 | put_device(dev); |
| 1851 | put_device(dev->parent); |
| 1852 | |
| 1853 | spin_lock(&devices_kset->list_lock); |
| 1854 | } |
| 1855 | spin_unlock(&devices_kset->list_lock); |
| 1856 | async_synchronize_full(); |
| 1857 | } |
| 1858 | |
| 1859 | /* |
| 1860 | * Device logging functions |
| 1861 | */ |
| 1862 | |
| 1863 | #ifdef CONFIG_PRINTK |
| 1864 | int __dev_printk(const char *level, const struct device *dev, |
| 1865 | struct va_format *vaf) |
| 1866 | { |
| 1867 | char dict[128]; |
| 1868 | size_t dictlen = 0; |
| 1869 | const char *subsys; |
| 1870 | |
| 1871 | if (!dev) |
| 1872 | return printk("%s(NULL device *): %pV", level, vaf); |
| 1873 | |
| 1874 | if (dev->class) |
| 1875 | subsys = dev->class->name; |
| 1876 | else if (dev->bus) |
| 1877 | subsys = dev->bus->name; |
| 1878 | else |
| 1879 | goto skip; |
| 1880 | |
| 1881 | dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen, |
| 1882 | "SUBSYSTEM=%s", subsys); |
| 1883 | |
| 1884 | /* |
| 1885 | * Add device identifier DEVICE=: |
| 1886 | * b12:8 block dev_t |
| 1887 | * c127:3 char dev_t |
| 1888 | * n8 netdev ifindex |
| 1889 | * +sound:card0 subsystem:devname |
| 1890 | */ |
| 1891 | if (MAJOR(dev->devt)) { |
| 1892 | char c; |
| 1893 | |
| 1894 | if (strcmp(subsys, "block") == 0) |
| 1895 | c = 'b'; |
| 1896 | else |
| 1897 | c = 'c'; |
| 1898 | dictlen++; |
| 1899 | dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen, |
| 1900 | "DEVICE=%c%u:%u", |
| 1901 | c, MAJOR(dev->devt), MINOR(dev->devt)); |
| 1902 | } else if (strcmp(subsys, "net") == 0) { |
| 1903 | struct net_device *net = to_net_dev(dev); |
| 1904 | |
| 1905 | dictlen++; |
| 1906 | dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen, |
| 1907 | "DEVICE=n%u", net->ifindex); |
| 1908 | } else { |
| 1909 | dictlen++; |
| 1910 | dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen, |
| 1911 | "DEVICE=+%s:%s", subsys, dev_name(dev)); |
| 1912 | } |
| 1913 | skip: |
| 1914 | return printk_emit(0, level[1] - '0', |
| 1915 | dictlen ? dict : NULL, dictlen, |
| 1916 | "%s %s: %pV", |
| 1917 | dev_driver_string(dev), dev_name(dev), vaf); |
| 1918 | } |
| 1919 | EXPORT_SYMBOL(__dev_printk); |
| 1920 | |
| 1921 | int dev_printk(const char *level, const struct device *dev, |
| 1922 | const char *fmt, ...) |
| 1923 | { |
| 1924 | struct va_format vaf; |
| 1925 | va_list args; |
| 1926 | int r; |
| 1927 | |
| 1928 | va_start(args, fmt); |
| 1929 | |
| 1930 | vaf.fmt = fmt; |
| 1931 | vaf.va = &args; |
| 1932 | |
| 1933 | r = __dev_printk(level, dev, &vaf); |
| 1934 | va_end(args); |
| 1935 | |
| 1936 | return r; |
| 1937 | } |
| 1938 | EXPORT_SYMBOL(dev_printk); |
| 1939 | |
| 1940 | #define define_dev_printk_level(func, kern_level) \ |
| 1941 | int func(const struct device *dev, const char *fmt, ...) \ |
| 1942 | { \ |
| 1943 | struct va_format vaf; \ |
| 1944 | va_list args; \ |
| 1945 | int r; \ |
| 1946 | \ |
| 1947 | va_start(args, fmt); \ |
| 1948 | \ |
| 1949 | vaf.fmt = fmt; \ |
| 1950 | vaf.va = &args; \ |
| 1951 | \ |
| 1952 | r = __dev_printk(kern_level, dev, &vaf); \ |
| 1953 | va_end(args); \ |
| 1954 | \ |
| 1955 | return r; \ |
| 1956 | } \ |
| 1957 | EXPORT_SYMBOL(func); |
| 1958 | |
| 1959 | define_dev_printk_level(dev_emerg, KERN_EMERG); |
| 1960 | define_dev_printk_level(dev_alert, KERN_ALERT); |
| 1961 | define_dev_printk_level(dev_crit, KERN_CRIT); |
| 1962 | define_dev_printk_level(dev_err, KERN_ERR); |
| 1963 | define_dev_printk_level(dev_warn, KERN_WARNING); |
| 1964 | define_dev_printk_level(dev_notice, KERN_NOTICE); |
| 1965 | define_dev_printk_level(_dev_info, KERN_INFO); |
| 1966 | |
| 1967 | #endif |