| 1 | /* |
| 2 | * Universal power supply monitor class |
| 3 | * |
| 4 | * Copyright © 2007 Anton Vorontsov <cbou@mail.ru> |
| 5 | * Copyright © 2004 Szabolcs Gyurko |
| 6 | * Copyright © 2003 Ian Molton <spyro@f2s.com> |
| 7 | * |
| 8 | * Modified: 2004, Oct Szabolcs Gyurko |
| 9 | * |
| 10 | * You may use this code as per GPL version 2 |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/types.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/device.h> |
| 18 | #include <linux/notifier.h> |
| 19 | #include <linux/err.h> |
| 20 | #include <linux/power_supply.h> |
| 21 | #include <linux/thermal.h> |
| 22 | #include "power_supply.h" |
| 23 | |
| 24 | /* exported for the APM Power driver, APM emulation */ |
| 25 | struct class *power_supply_class; |
| 26 | EXPORT_SYMBOL_GPL(power_supply_class); |
| 27 | |
| 28 | ATOMIC_NOTIFIER_HEAD(power_supply_notifier); |
| 29 | EXPORT_SYMBOL_GPL(power_supply_notifier); |
| 30 | |
| 31 | static struct device_type power_supply_dev_type; |
| 32 | |
| 33 | static bool __power_supply_is_supplied_by(struct power_supply *supplier, |
| 34 | struct power_supply *supply) |
| 35 | { |
| 36 | int i; |
| 37 | |
| 38 | if (!supply->supplied_from && !supplier->supplied_to) |
| 39 | return false; |
| 40 | |
| 41 | /* Support both supplied_to and supplied_from modes */ |
| 42 | if (supply->supplied_from) { |
| 43 | if (!supplier->name) |
| 44 | return false; |
| 45 | for (i = 0; i < supply->num_supplies; i++) |
| 46 | if (!strcmp(supplier->name, supply->supplied_from[i])) |
| 47 | return true; |
| 48 | } else { |
| 49 | if (!supply->name) |
| 50 | return false; |
| 51 | for (i = 0; i < supplier->num_supplicants; i++) |
| 52 | if (!strcmp(supplier->supplied_to[i], supply->name)) |
| 53 | return true; |
| 54 | } |
| 55 | |
| 56 | return false; |
| 57 | } |
| 58 | |
| 59 | static int __power_supply_changed_work(struct device *dev, void *data) |
| 60 | { |
| 61 | struct power_supply *psy = data; |
| 62 | struct power_supply *pst = dev_get_drvdata(dev); |
| 63 | |
| 64 | if (__power_supply_is_supplied_by(psy, pst)) { |
| 65 | if (pst->external_power_changed) |
| 66 | pst->external_power_changed(pst); |
| 67 | } |
| 68 | |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | static void power_supply_changed_work(struct work_struct *work) |
| 73 | { |
| 74 | unsigned long flags; |
| 75 | struct power_supply *psy = container_of(work, struct power_supply, |
| 76 | changed_work); |
| 77 | |
| 78 | dev_dbg(psy->dev, "%s\n", __func__); |
| 79 | |
| 80 | spin_lock_irqsave(&psy->changed_lock, flags); |
| 81 | if (psy->changed) { |
| 82 | psy->changed = false; |
| 83 | spin_unlock_irqrestore(&psy->changed_lock, flags); |
| 84 | class_for_each_device(power_supply_class, NULL, psy, |
| 85 | __power_supply_changed_work); |
| 86 | power_supply_update_leds(psy); |
| 87 | atomic_notifier_call_chain(&power_supply_notifier, |
| 88 | PSY_EVENT_PROP_CHANGED, psy); |
| 89 | kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE); |
| 90 | spin_lock_irqsave(&psy->changed_lock, flags); |
| 91 | } |
| 92 | /* |
| 93 | * Dependent power supplies (e.g. battery) may have changed state |
| 94 | * as a result of this event, so poll again and hold the |
| 95 | * wakeup_source until all events are processed. |
| 96 | */ |
| 97 | if (!psy->changed) |
| 98 | pm_relax(psy->dev); |
| 99 | spin_unlock_irqrestore(&psy->changed_lock, flags); |
| 100 | } |
| 101 | |
| 102 | void power_supply_changed(struct power_supply *psy) |
| 103 | { |
| 104 | unsigned long flags; |
| 105 | |
| 106 | dev_dbg(psy->dev, "%s\n", __func__); |
| 107 | |
| 108 | spin_lock_irqsave(&psy->changed_lock, flags); |
| 109 | psy->changed = true; |
| 110 | pm_stay_awake(psy->dev); |
| 111 | spin_unlock_irqrestore(&psy->changed_lock, flags); |
| 112 | schedule_work(&psy->changed_work); |
| 113 | } |
| 114 | EXPORT_SYMBOL_GPL(power_supply_changed); |
| 115 | |
| 116 | #ifdef CONFIG_OF |
| 117 | #include <linux/of.h> |
| 118 | |
| 119 | static int __power_supply_populate_supplied_from(struct device *dev, |
| 120 | void *data) |
| 121 | { |
| 122 | struct power_supply *psy = data; |
| 123 | struct power_supply *epsy = dev_get_drvdata(dev); |
| 124 | struct device_node *np; |
| 125 | int i = 0; |
| 126 | |
| 127 | do { |
| 128 | np = of_parse_phandle(psy->of_node, "power-supplies", i++); |
| 129 | if (!np) |
| 130 | break; |
| 131 | |
| 132 | if (np == epsy->of_node) { |
| 133 | dev_info(psy->dev, "%s: Found supply : %s\n", |
| 134 | psy->name, epsy->name); |
| 135 | psy->supplied_from[i-1] = (char *)epsy->name; |
| 136 | psy->num_supplies++; |
| 137 | of_node_put(np); |
| 138 | break; |
| 139 | } |
| 140 | of_node_put(np); |
| 141 | } while (np); |
| 142 | |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | static int power_supply_populate_supplied_from(struct power_supply *psy) |
| 147 | { |
| 148 | int error; |
| 149 | |
| 150 | error = class_for_each_device(power_supply_class, NULL, psy, |
| 151 | __power_supply_populate_supplied_from); |
| 152 | |
| 153 | dev_dbg(psy->dev, "%s %d\n", __func__, error); |
| 154 | |
| 155 | return error; |
| 156 | } |
| 157 | |
| 158 | static int __power_supply_find_supply_from_node(struct device *dev, |
| 159 | void *data) |
| 160 | { |
| 161 | struct device_node *np = data; |
| 162 | struct power_supply *epsy = dev_get_drvdata(dev); |
| 163 | |
| 164 | /* returning non-zero breaks out of class_for_each_device loop */ |
| 165 | if (epsy->of_node == np) |
| 166 | return 1; |
| 167 | |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | static int power_supply_find_supply_from_node(struct device_node *supply_node) |
| 172 | { |
| 173 | int error; |
| 174 | struct device *dev; |
| 175 | struct class_dev_iter iter; |
| 176 | |
| 177 | /* |
| 178 | * Use iterator to see if any other device is registered. |
| 179 | * This is required since class_for_each_device returns 0 |
| 180 | * if there are no devices registered. |
| 181 | */ |
| 182 | class_dev_iter_init(&iter, power_supply_class, NULL, NULL); |
| 183 | dev = class_dev_iter_next(&iter); |
| 184 | |
| 185 | if (!dev) |
| 186 | return -EPROBE_DEFER; |
| 187 | |
| 188 | /* |
| 189 | * class_for_each_device() either returns its own errors or values |
| 190 | * returned by __power_supply_find_supply_from_node(). |
| 191 | * |
| 192 | * __power_supply_find_supply_from_node() will return 0 (no match) |
| 193 | * or 1 (match). |
| 194 | * |
| 195 | * We return 0 if class_for_each_device() returned 1, -EPROBE_DEFER if |
| 196 | * it returned 0, or error as returned by it. |
| 197 | */ |
| 198 | error = class_for_each_device(power_supply_class, NULL, supply_node, |
| 199 | __power_supply_find_supply_from_node); |
| 200 | |
| 201 | return error ? (error == 1 ? 0 : error) : -EPROBE_DEFER; |
| 202 | } |
| 203 | |
| 204 | static int power_supply_check_supplies(struct power_supply *psy) |
| 205 | { |
| 206 | struct device_node *np; |
| 207 | int cnt = 0; |
| 208 | |
| 209 | /* If there is already a list honor it */ |
| 210 | if (psy->supplied_from && psy->num_supplies > 0) |
| 211 | return 0; |
| 212 | |
| 213 | /* No device node found, nothing to do */ |
| 214 | if (!psy->of_node) |
| 215 | return 0; |
| 216 | |
| 217 | do { |
| 218 | int ret; |
| 219 | |
| 220 | np = of_parse_phandle(psy->of_node, "power-supplies", cnt++); |
| 221 | if (!np) |
| 222 | break; |
| 223 | |
| 224 | ret = power_supply_find_supply_from_node(np); |
| 225 | of_node_put(np); |
| 226 | |
| 227 | if (ret) { |
| 228 | dev_dbg(psy->dev, "Failed to find supply!\n"); |
| 229 | return ret; |
| 230 | } |
| 231 | } while (np); |
| 232 | |
| 233 | /* Missing valid "power-supplies" entries */ |
| 234 | if (cnt == 1) |
| 235 | return 0; |
| 236 | |
| 237 | /* All supplies found, allocate char ** array for filling */ |
| 238 | psy->supplied_from = devm_kzalloc(psy->dev, sizeof(psy->supplied_from), |
| 239 | GFP_KERNEL); |
| 240 | if (!psy->supplied_from) { |
| 241 | dev_err(psy->dev, "Couldn't allocate memory for supply list\n"); |
| 242 | return -ENOMEM; |
| 243 | } |
| 244 | |
| 245 | *psy->supplied_from = devm_kzalloc(psy->dev, sizeof(char *) * (cnt - 1), |
| 246 | GFP_KERNEL); |
| 247 | if (!*psy->supplied_from) { |
| 248 | dev_err(psy->dev, "Couldn't allocate memory for supply list\n"); |
| 249 | return -ENOMEM; |
| 250 | } |
| 251 | |
| 252 | return power_supply_populate_supplied_from(psy); |
| 253 | } |
| 254 | #else |
| 255 | static inline int power_supply_check_supplies(struct power_supply *psy) |
| 256 | { |
| 257 | return 0; |
| 258 | } |
| 259 | #endif |
| 260 | |
| 261 | static int __power_supply_am_i_supplied(struct device *dev, void *data) |
| 262 | { |
| 263 | union power_supply_propval ret = {0,}; |
| 264 | struct power_supply *psy = data; |
| 265 | struct power_supply *epsy = dev_get_drvdata(dev); |
| 266 | |
| 267 | if (__power_supply_is_supplied_by(epsy, psy)) |
| 268 | if (!epsy->get_property(epsy, POWER_SUPPLY_PROP_ONLINE, &ret)) { |
| 269 | if (ret.intval) |
| 270 | return ret.intval; |
| 271 | } |
| 272 | |
| 273 | return 0; |
| 274 | } |
| 275 | |
| 276 | int power_supply_am_i_supplied(struct power_supply *psy) |
| 277 | { |
| 278 | int error; |
| 279 | |
| 280 | error = class_for_each_device(power_supply_class, NULL, psy, |
| 281 | __power_supply_am_i_supplied); |
| 282 | |
| 283 | dev_dbg(psy->dev, "%s %d\n", __func__, error); |
| 284 | |
| 285 | return error; |
| 286 | } |
| 287 | EXPORT_SYMBOL_GPL(power_supply_am_i_supplied); |
| 288 | |
| 289 | static int __power_supply_is_system_supplied(struct device *dev, void *data) |
| 290 | { |
| 291 | union power_supply_propval ret = {0,}; |
| 292 | struct power_supply *psy = dev_get_drvdata(dev); |
| 293 | unsigned int *count = data; |
| 294 | |
| 295 | (*count)++; |
| 296 | if (psy->type != POWER_SUPPLY_TYPE_BATTERY) { |
| 297 | if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret)) |
| 298 | return 0; |
| 299 | if (ret.intval) |
| 300 | return ret.intval; |
| 301 | } |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | int power_supply_is_system_supplied(void) |
| 306 | { |
| 307 | int error; |
| 308 | unsigned int count = 0; |
| 309 | |
| 310 | error = class_for_each_device(power_supply_class, NULL, &count, |
| 311 | __power_supply_is_system_supplied); |
| 312 | |
| 313 | /* |
| 314 | * If no power class device was found at all, most probably we are |
| 315 | * running on a desktop system, so assume we are on mains power. |
| 316 | */ |
| 317 | if (count == 0) |
| 318 | return 1; |
| 319 | |
| 320 | return error; |
| 321 | } |
| 322 | EXPORT_SYMBOL_GPL(power_supply_is_system_supplied); |
| 323 | |
| 324 | int power_supply_set_battery_charged(struct power_supply *psy) |
| 325 | { |
| 326 | if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) { |
| 327 | psy->set_charged(psy); |
| 328 | return 0; |
| 329 | } |
| 330 | |
| 331 | return -EINVAL; |
| 332 | } |
| 333 | EXPORT_SYMBOL_GPL(power_supply_set_battery_charged); |
| 334 | |
| 335 | static int power_supply_match_device_by_name(struct device *dev, const void *data) |
| 336 | { |
| 337 | const char *name = data; |
| 338 | struct power_supply *psy = dev_get_drvdata(dev); |
| 339 | |
| 340 | return strcmp(psy->name, name) == 0; |
| 341 | } |
| 342 | |
| 343 | struct power_supply *power_supply_get_by_name(const char *name) |
| 344 | { |
| 345 | struct device *dev = class_find_device(power_supply_class, NULL, name, |
| 346 | power_supply_match_device_by_name); |
| 347 | |
| 348 | return dev ? dev_get_drvdata(dev) : NULL; |
| 349 | } |
| 350 | EXPORT_SYMBOL_GPL(power_supply_get_by_name); |
| 351 | |
| 352 | #ifdef CONFIG_OF |
| 353 | static int power_supply_match_device_node(struct device *dev, const void *data) |
| 354 | { |
| 355 | return dev->parent && dev->parent->of_node == data; |
| 356 | } |
| 357 | |
| 358 | struct power_supply *power_supply_get_by_phandle(struct device_node *np, |
| 359 | const char *property) |
| 360 | { |
| 361 | struct device_node *power_supply_np; |
| 362 | struct device *dev; |
| 363 | |
| 364 | power_supply_np = of_parse_phandle(np, property, 0); |
| 365 | if (!power_supply_np) |
| 366 | return ERR_PTR(-ENODEV); |
| 367 | |
| 368 | dev = class_find_device(power_supply_class, NULL, power_supply_np, |
| 369 | power_supply_match_device_node); |
| 370 | |
| 371 | of_node_put(power_supply_np); |
| 372 | |
| 373 | return dev ? dev_get_drvdata(dev) : NULL; |
| 374 | } |
| 375 | EXPORT_SYMBOL_GPL(power_supply_get_by_phandle); |
| 376 | #endif /* CONFIG_OF */ |
| 377 | |
| 378 | int power_supply_powers(struct power_supply *psy, struct device *dev) |
| 379 | { |
| 380 | return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers"); |
| 381 | } |
| 382 | EXPORT_SYMBOL_GPL(power_supply_powers); |
| 383 | |
| 384 | static void power_supply_dev_release(struct device *dev) |
| 385 | { |
| 386 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
| 387 | kfree(dev); |
| 388 | } |
| 389 | |
| 390 | int power_supply_reg_notifier(struct notifier_block *nb) |
| 391 | { |
| 392 | return atomic_notifier_chain_register(&power_supply_notifier, nb); |
| 393 | } |
| 394 | EXPORT_SYMBOL_GPL(power_supply_reg_notifier); |
| 395 | |
| 396 | void power_supply_unreg_notifier(struct notifier_block *nb) |
| 397 | { |
| 398 | atomic_notifier_chain_unregister(&power_supply_notifier, nb); |
| 399 | } |
| 400 | EXPORT_SYMBOL_GPL(power_supply_unreg_notifier); |
| 401 | |
| 402 | #ifdef CONFIG_THERMAL |
| 403 | static int power_supply_read_temp(struct thermal_zone_device *tzd, |
| 404 | unsigned long *temp) |
| 405 | { |
| 406 | struct power_supply *psy; |
| 407 | union power_supply_propval val; |
| 408 | int ret; |
| 409 | |
| 410 | WARN_ON(tzd == NULL); |
| 411 | psy = tzd->devdata; |
| 412 | ret = psy->get_property(psy, POWER_SUPPLY_PROP_TEMP, &val); |
| 413 | |
| 414 | /* Convert tenths of degree Celsius to milli degree Celsius. */ |
| 415 | if (!ret) |
| 416 | *temp = val.intval * 100; |
| 417 | |
| 418 | return ret; |
| 419 | } |
| 420 | |
| 421 | static struct thermal_zone_device_ops psy_tzd_ops = { |
| 422 | .get_temp = power_supply_read_temp, |
| 423 | }; |
| 424 | |
| 425 | static int psy_register_thermal(struct power_supply *psy) |
| 426 | { |
| 427 | int i; |
| 428 | |
| 429 | /* Register battery zone device psy reports temperature */ |
| 430 | for (i = 0; i < psy->num_properties; i++) { |
| 431 | if (psy->properties[i] == POWER_SUPPLY_PROP_TEMP) { |
| 432 | psy->tzd = thermal_zone_device_register(psy->name, 0, 0, |
| 433 | psy, &psy_tzd_ops, NULL, 0, 0); |
| 434 | if (IS_ERR(psy->tzd)) |
| 435 | return PTR_ERR(psy->tzd); |
| 436 | break; |
| 437 | } |
| 438 | } |
| 439 | return 0; |
| 440 | } |
| 441 | |
| 442 | static void psy_unregister_thermal(struct power_supply *psy) |
| 443 | { |
| 444 | if (IS_ERR_OR_NULL(psy->tzd)) |
| 445 | return; |
| 446 | thermal_zone_device_unregister(psy->tzd); |
| 447 | } |
| 448 | |
| 449 | /* thermal cooling device callbacks */ |
| 450 | static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd, |
| 451 | unsigned long *state) |
| 452 | { |
| 453 | struct power_supply *psy; |
| 454 | union power_supply_propval val; |
| 455 | int ret; |
| 456 | |
| 457 | psy = tcd->devdata; |
| 458 | ret = psy->get_property(psy, |
| 459 | POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val); |
| 460 | if (!ret) |
| 461 | *state = val.intval; |
| 462 | |
| 463 | return ret; |
| 464 | } |
| 465 | |
| 466 | static int ps_get_cur_chrage_cntl_limit(struct thermal_cooling_device *tcd, |
| 467 | unsigned long *state) |
| 468 | { |
| 469 | struct power_supply *psy; |
| 470 | union power_supply_propval val; |
| 471 | int ret; |
| 472 | |
| 473 | psy = tcd->devdata; |
| 474 | ret = psy->get_property(psy, |
| 475 | POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val); |
| 476 | if (!ret) |
| 477 | *state = val.intval; |
| 478 | |
| 479 | return ret; |
| 480 | } |
| 481 | |
| 482 | static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd, |
| 483 | unsigned long state) |
| 484 | { |
| 485 | struct power_supply *psy; |
| 486 | union power_supply_propval val; |
| 487 | int ret; |
| 488 | |
| 489 | psy = tcd->devdata; |
| 490 | val.intval = state; |
| 491 | ret = psy->set_property(psy, |
| 492 | POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val); |
| 493 | |
| 494 | return ret; |
| 495 | } |
| 496 | |
| 497 | static struct thermal_cooling_device_ops psy_tcd_ops = { |
| 498 | .get_max_state = ps_get_max_charge_cntl_limit, |
| 499 | .get_cur_state = ps_get_cur_chrage_cntl_limit, |
| 500 | .set_cur_state = ps_set_cur_charge_cntl_limit, |
| 501 | }; |
| 502 | |
| 503 | static int psy_register_cooler(struct power_supply *psy) |
| 504 | { |
| 505 | int i; |
| 506 | |
| 507 | /* Register for cooling device if psy can control charging */ |
| 508 | for (i = 0; i < psy->num_properties; i++) { |
| 509 | if (psy->properties[i] == |
| 510 | POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) { |
| 511 | psy->tcd = thermal_cooling_device_register( |
| 512 | (char *)psy->name, |
| 513 | psy, &psy_tcd_ops); |
| 514 | if (IS_ERR(psy->tcd)) |
| 515 | return PTR_ERR(psy->tcd); |
| 516 | break; |
| 517 | } |
| 518 | } |
| 519 | return 0; |
| 520 | } |
| 521 | |
| 522 | static void psy_unregister_cooler(struct power_supply *psy) |
| 523 | { |
| 524 | if (IS_ERR_OR_NULL(psy->tcd)) |
| 525 | return; |
| 526 | thermal_cooling_device_unregister(psy->tcd); |
| 527 | } |
| 528 | #else |
| 529 | static int psy_register_thermal(struct power_supply *psy) |
| 530 | { |
| 531 | return 0; |
| 532 | } |
| 533 | |
| 534 | static void psy_unregister_thermal(struct power_supply *psy) |
| 535 | { |
| 536 | } |
| 537 | |
| 538 | static int psy_register_cooler(struct power_supply *psy) |
| 539 | { |
| 540 | return 0; |
| 541 | } |
| 542 | |
| 543 | static void psy_unregister_cooler(struct power_supply *psy) |
| 544 | { |
| 545 | } |
| 546 | #endif |
| 547 | |
| 548 | static int __power_supply_register(struct device *parent, |
| 549 | struct power_supply *psy, bool ws) |
| 550 | { |
| 551 | struct device *dev; |
| 552 | int rc; |
| 553 | |
| 554 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 555 | if (!dev) |
| 556 | return -ENOMEM; |
| 557 | |
| 558 | device_initialize(dev); |
| 559 | |
| 560 | dev->class = power_supply_class; |
| 561 | dev->type = &power_supply_dev_type; |
| 562 | dev->parent = parent; |
| 563 | dev->release = power_supply_dev_release; |
| 564 | dev_set_drvdata(dev, psy); |
| 565 | psy->dev = dev; |
| 566 | |
| 567 | rc = dev_set_name(dev, "%s", psy->name); |
| 568 | if (rc) |
| 569 | goto dev_set_name_failed; |
| 570 | |
| 571 | INIT_WORK(&psy->changed_work, power_supply_changed_work); |
| 572 | |
| 573 | rc = power_supply_check_supplies(psy); |
| 574 | if (rc) { |
| 575 | dev_info(dev, "Not all required supplies found, defer probe\n"); |
| 576 | goto check_supplies_failed; |
| 577 | } |
| 578 | |
| 579 | spin_lock_init(&psy->changed_lock); |
| 580 | rc = device_init_wakeup(dev, ws); |
| 581 | if (rc) |
| 582 | goto wakeup_init_failed; |
| 583 | |
| 584 | rc = device_add(dev); |
| 585 | if (rc) |
| 586 | goto device_add_failed; |
| 587 | |
| 588 | rc = psy_register_thermal(psy); |
| 589 | if (rc) |
| 590 | goto register_thermal_failed; |
| 591 | |
| 592 | rc = psy_register_cooler(psy); |
| 593 | if (rc) |
| 594 | goto register_cooler_failed; |
| 595 | |
| 596 | rc = power_supply_create_triggers(psy); |
| 597 | if (rc) |
| 598 | goto create_triggers_failed; |
| 599 | |
| 600 | power_supply_changed(psy); |
| 601 | |
| 602 | goto success; |
| 603 | |
| 604 | create_triggers_failed: |
| 605 | psy_unregister_cooler(psy); |
| 606 | register_cooler_failed: |
| 607 | psy_unregister_thermal(psy); |
| 608 | register_thermal_failed: |
| 609 | device_del(dev); |
| 610 | device_add_failed: |
| 611 | wakeup_init_failed: |
| 612 | check_supplies_failed: |
| 613 | dev_set_name_failed: |
| 614 | put_device(dev); |
| 615 | success: |
| 616 | return rc; |
| 617 | } |
| 618 | |
| 619 | int power_supply_register(struct device *parent, struct power_supply *psy) |
| 620 | { |
| 621 | return __power_supply_register(parent, psy, true); |
| 622 | } |
| 623 | EXPORT_SYMBOL_GPL(power_supply_register); |
| 624 | |
| 625 | int power_supply_register_no_ws(struct device *parent, struct power_supply *psy) |
| 626 | { |
| 627 | return __power_supply_register(parent, psy, false); |
| 628 | } |
| 629 | EXPORT_SYMBOL_GPL(power_supply_register_no_ws); |
| 630 | |
| 631 | void power_supply_unregister(struct power_supply *psy) |
| 632 | { |
| 633 | cancel_work_sync(&psy->changed_work); |
| 634 | sysfs_remove_link(&psy->dev->kobj, "powers"); |
| 635 | power_supply_remove_triggers(psy); |
| 636 | psy_unregister_cooler(psy); |
| 637 | psy_unregister_thermal(psy); |
| 638 | device_init_wakeup(psy->dev, false); |
| 639 | device_unregister(psy->dev); |
| 640 | } |
| 641 | EXPORT_SYMBOL_GPL(power_supply_unregister); |
| 642 | |
| 643 | static int __init power_supply_class_init(void) |
| 644 | { |
| 645 | power_supply_class = class_create(THIS_MODULE, "power_supply"); |
| 646 | |
| 647 | if (IS_ERR(power_supply_class)) |
| 648 | return PTR_ERR(power_supply_class); |
| 649 | |
| 650 | power_supply_class->dev_uevent = power_supply_uevent; |
| 651 | power_supply_init_attrs(&power_supply_dev_type); |
| 652 | |
| 653 | return 0; |
| 654 | } |
| 655 | |
| 656 | static void __exit power_supply_class_exit(void) |
| 657 | { |
| 658 | class_destroy(power_supply_class); |
| 659 | } |
| 660 | |
| 661 | subsys_initcall(power_supply_class_init); |
| 662 | module_exit(power_supply_class_exit); |
| 663 | |
| 664 | MODULE_DESCRIPTION("Universal power supply monitor class"); |
| 665 | MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, " |
| 666 | "Szabolcs Gyurko, " |
| 667 | "Anton Vorontsov <cbou@mail.ru>"); |
| 668 | MODULE_LICENSE("GPL"); |