Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * acpi_power.c - ACPI Bus Power Management ($Revision: 39 $) |
| 3 | * |
| 4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> |
| 5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
| 6 | * |
| 7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or (at |
| 12 | * your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 21 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| 22 | * |
| 23 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 24 | */ |
| 25 | |
| 26 | /* |
| 27 | * ACPI power-managed devices may be controlled in two ways: |
| 28 | * 1. via "Device Specific (D-State) Control" |
| 29 | * 2. via "Power Resource Control". |
| 30 | * This module is used to manage devices relying on Power Resource Control. |
| 31 | * |
| 32 | * An ACPI "power resource object" describes a software controllable power |
| 33 | * plane, clock plane, or other resource used by a power managed device. |
| 34 | * A device may rely on multiple power resources, and a power resource |
| 35 | * may be shared by multiple devices. |
| 36 | */ |
| 37 | |
| 38 | #include <linux/kernel.h> |
| 39 | #include <linux/module.h> |
| 40 | #include <linux/init.h> |
| 41 | #include <linux/types.h> |
| 42 | #include <linux/proc_fs.h> |
| 43 | #include <linux/seq_file.h> |
| 44 | #include <acpi/acpi_bus.h> |
| 45 | #include <acpi/acpi_drivers.h> |
| 46 | |
| 47 | |
| 48 | #define _COMPONENT ACPI_POWER_COMPONENT |
| 49 | ACPI_MODULE_NAME ("acpi_power") |
| 50 | |
| 51 | #define ACPI_POWER_COMPONENT 0x00800000 |
| 52 | #define ACPI_POWER_CLASS "power_resource" |
| 53 | #define ACPI_POWER_DRIVER_NAME "ACPI Power Resource Driver" |
| 54 | #define ACPI_POWER_DEVICE_NAME "Power Resource" |
| 55 | #define ACPI_POWER_FILE_INFO "info" |
| 56 | #define ACPI_POWER_FILE_STATUS "state" |
| 57 | #define ACPI_POWER_RESOURCE_STATE_OFF 0x00 |
| 58 | #define ACPI_POWER_RESOURCE_STATE_ON 0x01 |
| 59 | #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF |
| 60 | |
| 61 | static int acpi_power_add (struct acpi_device *device); |
| 62 | static int acpi_power_remove (struct acpi_device *device, int type); |
| 63 | static int acpi_power_open_fs(struct inode *inode, struct file *file); |
| 64 | |
| 65 | static struct acpi_driver acpi_power_driver = { |
| 66 | .name = ACPI_POWER_DRIVER_NAME, |
| 67 | .class = ACPI_POWER_CLASS, |
| 68 | .ids = ACPI_POWER_HID, |
| 69 | .ops = { |
| 70 | .add = acpi_power_add, |
| 71 | .remove = acpi_power_remove, |
| 72 | }, |
| 73 | }; |
| 74 | |
| 75 | struct acpi_power_resource |
| 76 | { |
| 77 | acpi_handle handle; |
| 78 | acpi_bus_id name; |
| 79 | u32 system_level; |
| 80 | u32 order; |
| 81 | int state; |
| 82 | int references; |
| 83 | }; |
| 84 | |
| 85 | static struct list_head acpi_power_resource_list; |
| 86 | |
| 87 | static struct file_operations acpi_power_fops = { |
| 88 | .open = acpi_power_open_fs, |
| 89 | .read = seq_read, |
| 90 | .llseek = seq_lseek, |
| 91 | .release = single_release, |
| 92 | }; |
| 93 | |
| 94 | /* -------------------------------------------------------------------------- |
| 95 | Power Resource Management |
| 96 | -------------------------------------------------------------------------- */ |
| 97 | |
| 98 | static int |
| 99 | acpi_power_get_context ( |
| 100 | acpi_handle handle, |
| 101 | struct acpi_power_resource **resource) |
| 102 | { |
| 103 | int result = 0; |
| 104 | struct acpi_device *device = NULL; |
| 105 | |
| 106 | ACPI_FUNCTION_TRACE("acpi_power_get_context"); |
| 107 | |
| 108 | if (!resource) |
| 109 | return_VALUE(-ENODEV); |
| 110 | |
| 111 | result = acpi_bus_get_device(handle, &device); |
| 112 | if (result) { |
| 113 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Error getting context [%p]\n", |
| 114 | handle)); |
| 115 | return_VALUE(result); |
| 116 | } |
| 117 | |
| 118 | *resource = (struct acpi_power_resource *) acpi_driver_data(device); |
| 119 | if (!resource) |
| 120 | return_VALUE(-ENODEV); |
| 121 | |
| 122 | return_VALUE(0); |
| 123 | } |
| 124 | |
| 125 | |
| 126 | static int |
| 127 | acpi_power_get_state ( |
| 128 | struct acpi_power_resource *resource) |
| 129 | { |
| 130 | acpi_status status = AE_OK; |
| 131 | unsigned long sta = 0; |
| 132 | |
| 133 | ACPI_FUNCTION_TRACE("acpi_power_get_state"); |
| 134 | |
| 135 | if (!resource) |
| 136 | return_VALUE(-EINVAL); |
| 137 | |
| 138 | status = acpi_evaluate_integer(resource->handle, "_STA", NULL, &sta); |
| 139 | if (ACPI_FAILURE(status)) |
| 140 | return_VALUE(-ENODEV); |
| 141 | |
| 142 | if (sta & 0x01) |
| 143 | resource->state = ACPI_POWER_RESOURCE_STATE_ON; |
| 144 | else |
| 145 | resource->state = ACPI_POWER_RESOURCE_STATE_OFF; |
| 146 | |
| 147 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", |
| 148 | resource->name, resource->state?"on":"off")); |
| 149 | |
| 150 | return_VALUE(0); |
| 151 | } |
| 152 | |
| 153 | |
| 154 | static int |
| 155 | acpi_power_get_list_state ( |
| 156 | struct acpi_handle_list *list, |
| 157 | int *state) |
| 158 | { |
| 159 | int result = 0; |
| 160 | struct acpi_power_resource *resource = NULL; |
| 161 | u32 i = 0; |
| 162 | |
| 163 | ACPI_FUNCTION_TRACE("acpi_power_get_list_state"); |
| 164 | |
| 165 | if (!list || !state) |
| 166 | return_VALUE(-EINVAL); |
| 167 | |
| 168 | /* The state of the list is 'on' IFF all resources are 'on'. */ |
| 169 | |
| 170 | for (i=0; i<list->count; i++) { |
| 171 | result = acpi_power_get_context(list->handles[i], &resource); |
| 172 | if (result) |
| 173 | return_VALUE(result); |
| 174 | result = acpi_power_get_state(resource); |
| 175 | if (result) |
| 176 | return_VALUE(result); |
| 177 | |
| 178 | *state = resource->state; |
| 179 | |
| 180 | if (*state != ACPI_POWER_RESOURCE_STATE_ON) |
| 181 | break; |
| 182 | } |
| 183 | |
| 184 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", |
| 185 | *state?"on":"off")); |
| 186 | |
| 187 | return_VALUE(result); |
| 188 | } |
| 189 | |
| 190 | |
| 191 | static int |
| 192 | acpi_power_on ( |
| 193 | acpi_handle handle) |
| 194 | { |
| 195 | int result = 0; |
| 196 | acpi_status status = AE_OK; |
| 197 | struct acpi_device *device = NULL; |
| 198 | struct acpi_power_resource *resource = NULL; |
| 199 | |
| 200 | ACPI_FUNCTION_TRACE("acpi_power_on"); |
| 201 | |
| 202 | result = acpi_power_get_context(handle, &resource); |
| 203 | if (result) |
| 204 | return_VALUE(result); |
| 205 | |
| 206 | resource->references++; |
| 207 | |
| 208 | if ((resource->references > 1) |
| 209 | || (resource->state == ACPI_POWER_RESOURCE_STATE_ON)) { |
| 210 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already on\n", |
| 211 | resource->name)); |
| 212 | return_VALUE(0); |
| 213 | } |
| 214 | |
| 215 | status = acpi_evaluate_object(resource->handle, "_ON", NULL, NULL); |
| 216 | if (ACPI_FAILURE(status)) |
| 217 | return_VALUE(-ENODEV); |
| 218 | |
| 219 | result = acpi_power_get_state(resource); |
| 220 | if (result) |
| 221 | return_VALUE(result); |
| 222 | if (resource->state != ACPI_POWER_RESOURCE_STATE_ON) |
| 223 | return_VALUE(-ENOEXEC); |
| 224 | |
| 225 | /* Update the power resource's _device_ power state */ |
| 226 | result = acpi_bus_get_device(resource->handle, &device); |
| 227 | if (result) |
| 228 | return_VALUE(result); |
| 229 | device->power.state = ACPI_STATE_D0; |
| 230 | |
| 231 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n", |
| 232 | resource->name)); |
| 233 | |
| 234 | return_VALUE(0); |
| 235 | } |
| 236 | |
| 237 | |
| 238 | static int |
| 239 | acpi_power_off_device ( |
| 240 | acpi_handle handle) |
| 241 | { |
| 242 | int result = 0; |
| 243 | acpi_status status = AE_OK; |
| 244 | struct acpi_device *device = NULL; |
| 245 | struct acpi_power_resource *resource = NULL; |
| 246 | |
| 247 | ACPI_FUNCTION_TRACE("acpi_power_off_device"); |
| 248 | |
| 249 | result = acpi_power_get_context(handle, &resource); |
| 250 | if (result) |
| 251 | return_VALUE(result); |
| 252 | |
| 253 | if (resource->references) |
| 254 | resource->references--; |
| 255 | |
| 256 | if (resource->references) { |
| 257 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 258 | "Resource [%s] is still in use, dereferencing\n", |
| 259 | device->pnp.bus_id)); |
| 260 | return_VALUE(0); |
| 261 | } |
| 262 | |
| 263 | if (resource->state == ACPI_POWER_RESOURCE_STATE_OFF) { |
| 264 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already off\n", |
| 265 | device->pnp.bus_id)); |
| 266 | return_VALUE(0); |
| 267 | } |
| 268 | |
| 269 | status = acpi_evaluate_object(resource->handle, "_OFF", NULL, NULL); |
| 270 | if (ACPI_FAILURE(status)) |
| 271 | return_VALUE(-ENODEV); |
| 272 | |
| 273 | result = acpi_power_get_state(resource); |
| 274 | if (result) |
| 275 | return_VALUE(result); |
| 276 | if (resource->state != ACPI_POWER_RESOURCE_STATE_OFF) |
| 277 | return_VALUE(-ENOEXEC); |
| 278 | |
| 279 | /* Update the power resource's _device_ power state */ |
| 280 | result = acpi_bus_get_device(resource->handle, &device); |
| 281 | if (result) |
| 282 | return_VALUE(result); |
| 283 | device->power.state = ACPI_STATE_D3; |
| 284 | |
| 285 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n", |
| 286 | resource->name)); |
| 287 | |
| 288 | return_VALUE(0); |
| 289 | } |
| 290 | |
| 291 | /* |
| 292 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): |
| 293 | * 1. Power on the power resources required for the wakeup device |
| 294 | * 2. Enable _PSW (power state wake) for the device if present |
| 295 | */ |
| 296 | int acpi_enable_wakeup_device_power (struct acpi_device *dev) |
| 297 | { |
| 298 | union acpi_object arg = {ACPI_TYPE_INTEGER}; |
| 299 | struct acpi_object_list arg_list = {1, &arg}; |
| 300 | acpi_status status = AE_OK; |
| 301 | int i; |
| 302 | int ret = 0; |
| 303 | |
| 304 | ACPI_FUNCTION_TRACE("acpi_enable_wakeup_device_power"); |
| 305 | if (!dev || !dev->wakeup.flags.valid) |
| 306 | return_VALUE(-1); |
| 307 | |
| 308 | arg.integer.value = 1; |
| 309 | /* Open power resource */ |
| 310 | for (i = 0; i < dev->wakeup.resources.count; i++) { |
| 311 | ret = acpi_power_on(dev->wakeup.resources.handles[i]); |
| 312 | if (ret) { |
| 313 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
| 314 | "Error transition power state\n")); |
| 315 | dev->wakeup.flags.valid = 0; |
| 316 | return_VALUE(-1); |
| 317 | } |
| 318 | } |
| 319 | |
| 320 | /* Execute PSW */ |
| 321 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); |
| 322 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { |
| 323 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluate _PSW\n")); |
| 324 | dev->wakeup.flags.valid = 0; |
| 325 | ret = -1; |
| 326 | } |
| 327 | |
| 328 | return_VALUE(ret); |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * Shutdown a wakeup device, counterpart of above method |
| 333 | * 1. Disable _PSW (power state wake) |
| 334 | * 2. Shutdown down the power resources |
| 335 | */ |
| 336 | int acpi_disable_wakeup_device_power (struct acpi_device *dev) |
| 337 | { |
| 338 | union acpi_object arg = {ACPI_TYPE_INTEGER}; |
| 339 | struct acpi_object_list arg_list = {1, &arg}; |
| 340 | acpi_status status = AE_OK; |
| 341 | int i; |
| 342 | int ret = 0; |
| 343 | |
| 344 | ACPI_FUNCTION_TRACE("acpi_disable_wakeup_device_power"); |
| 345 | |
| 346 | if (!dev || !dev->wakeup.flags.valid) |
| 347 | return_VALUE(-1); |
| 348 | |
| 349 | arg.integer.value = 0; |
| 350 | /* Execute PSW */ |
| 351 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); |
| 352 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { |
| 353 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluate _PSW\n")); |
| 354 | dev->wakeup.flags.valid = 0; |
| 355 | return_VALUE(-1); |
| 356 | } |
| 357 | |
| 358 | /* Close power resource */ |
| 359 | for (i = 0; i < dev->wakeup.resources.count; i++) { |
| 360 | ret = acpi_power_off_device(dev->wakeup.resources.handles[i]); |
| 361 | if (ret) { |
| 362 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
| 363 | "Error transition power state\n")); |
| 364 | dev->wakeup.flags.valid = 0; |
| 365 | return_VALUE(-1); |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | return_VALUE(ret); |
| 370 | } |
| 371 | |
| 372 | /* -------------------------------------------------------------------------- |
| 373 | Device Power Management |
| 374 | -------------------------------------------------------------------------- */ |
| 375 | |
| 376 | int |
| 377 | acpi_power_get_inferred_state ( |
| 378 | struct acpi_device *device) |
| 379 | { |
| 380 | int result = 0; |
| 381 | struct acpi_handle_list *list = NULL; |
| 382 | int list_state = 0; |
| 383 | int i = 0; |
| 384 | |
| 385 | ACPI_FUNCTION_TRACE("acpi_power_get_inferred_state"); |
| 386 | |
| 387 | if (!device) |
| 388 | return_VALUE(-EINVAL); |
| 389 | |
| 390 | device->power.state = ACPI_STATE_UNKNOWN; |
| 391 | |
| 392 | /* |
| 393 | * We know a device's inferred power state when all the resources |
| 394 | * required for a given D-state are 'on'. |
| 395 | */ |
| 396 | for (i=ACPI_STATE_D0; i<ACPI_STATE_D3; i++) { |
| 397 | list = &device->power.states[i].resources; |
| 398 | if (list->count < 1) |
| 399 | continue; |
| 400 | |
| 401 | result = acpi_power_get_list_state(list, &list_state); |
| 402 | if (result) |
| 403 | return_VALUE(result); |
| 404 | |
| 405 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { |
| 406 | device->power.state = i; |
| 407 | return_VALUE(0); |
| 408 | } |
| 409 | } |
| 410 | |
| 411 | device->power.state = ACPI_STATE_D3; |
| 412 | |
| 413 | return_VALUE(0); |
| 414 | } |
| 415 | |
| 416 | |
| 417 | int |
| 418 | acpi_power_transition ( |
| 419 | struct acpi_device *device, |
| 420 | int state) |
| 421 | { |
| 422 | int result = 0; |
| 423 | struct acpi_handle_list *cl = NULL; /* Current Resources */ |
| 424 | struct acpi_handle_list *tl = NULL; /* Target Resources */ |
| 425 | int i = 0; |
| 426 | |
| 427 | ACPI_FUNCTION_TRACE("acpi_power_transition"); |
| 428 | |
| 429 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) |
| 430 | return_VALUE(-EINVAL); |
| 431 | |
| 432 | if ((device->power.state < ACPI_STATE_D0) || (device->power.state > ACPI_STATE_D3)) |
| 433 | return_VALUE(-ENODEV); |
| 434 | |
| 435 | cl = &device->power.states[device->power.state].resources; |
| 436 | tl = &device->power.states[state].resources; |
| 437 | |
| 438 | device->power.state = ACPI_STATE_UNKNOWN; |
| 439 | |
| 440 | if (!cl->count && !tl->count) { |
| 441 | result = -ENODEV; |
| 442 | goto end; |
| 443 | } |
| 444 | |
| 445 | /* TBD: Resources must be ordered. */ |
| 446 | |
| 447 | /* |
| 448 | * First we reference all power resources required in the target list |
| 449 | * (e.g. so the device doesn't lose power while transitioning). |
| 450 | */ |
| 451 | for (i=0; i<tl->count; i++) { |
| 452 | result = acpi_power_on(tl->handles[i]); |
| 453 | if (result) |
| 454 | goto end; |
| 455 | } |
| 456 | |
| 457 | /* |
| 458 | * Then we dereference all power resources used in the current list. |
| 459 | */ |
| 460 | for (i=0; i<cl->count; i++) { |
| 461 | result = acpi_power_off_device(cl->handles[i]); |
| 462 | if (result) |
| 463 | goto end; |
| 464 | } |
| 465 | |
| 466 | /* We shouldn't change the state till all above operations succeed */ |
| 467 | device->power.state = state; |
| 468 | end: |
| 469 | if (result) |
| 470 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, |
| 471 | "Error transitioning device [%s] to D%d\n", |
| 472 | device->pnp.bus_id, state)); |
| 473 | |
| 474 | return_VALUE(result); |
| 475 | } |
| 476 | |
| 477 | |
| 478 | /* -------------------------------------------------------------------------- |
| 479 | FS Interface (/proc) |
| 480 | -------------------------------------------------------------------------- */ |
| 481 | |
| 482 | static struct proc_dir_entry *acpi_power_dir; |
| 483 | |
| 484 | static int acpi_power_seq_show(struct seq_file *seq, void *offset) |
| 485 | { |
| 486 | struct acpi_power_resource *resource = NULL; |
| 487 | |
| 488 | ACPI_FUNCTION_TRACE("acpi_power_seq_show"); |
| 489 | |
| 490 | resource = (struct acpi_power_resource *)seq->private; |
| 491 | |
| 492 | if (!resource) |
| 493 | goto end; |
| 494 | |
| 495 | seq_puts(seq, "state: "); |
| 496 | switch (resource->state) { |
| 497 | case ACPI_POWER_RESOURCE_STATE_ON: |
| 498 | seq_puts(seq, "on\n"); |
| 499 | break; |
| 500 | case ACPI_POWER_RESOURCE_STATE_OFF: |
| 501 | seq_puts(seq, "off\n"); |
| 502 | break; |
| 503 | default: |
| 504 | seq_puts(seq, "unknown\n"); |
| 505 | break; |
| 506 | } |
| 507 | |
| 508 | seq_printf(seq, "system level: S%d\n" |
| 509 | "order: %d\n" |
| 510 | "reference count: %d\n", |
| 511 | resource->system_level, |
| 512 | resource->order, |
| 513 | resource->references); |
| 514 | |
| 515 | end: |
| 516 | return_VALUE(0); |
| 517 | } |
| 518 | |
| 519 | static int acpi_power_open_fs(struct inode *inode, struct file *file) |
| 520 | { |
| 521 | return single_open(file, acpi_power_seq_show, PDE(inode)->data); |
| 522 | } |
| 523 | |
| 524 | static int |
| 525 | acpi_power_add_fs ( |
| 526 | struct acpi_device *device) |
| 527 | { |
| 528 | struct proc_dir_entry *entry = NULL; |
| 529 | |
| 530 | ACPI_FUNCTION_TRACE("acpi_power_add_fs"); |
| 531 | |
| 532 | if (!device) |
| 533 | return_VALUE(-EINVAL); |
| 534 | |
| 535 | if (!acpi_device_dir(device)) { |
| 536 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), |
| 537 | acpi_power_dir); |
| 538 | if (!acpi_device_dir(device)) |
| 539 | return_VALUE(-ENODEV); |
| 540 | } |
| 541 | |
| 542 | /* 'status' [R] */ |
| 543 | entry = create_proc_entry(ACPI_POWER_FILE_STATUS, |
| 544 | S_IRUGO, acpi_device_dir(device)); |
| 545 | if (!entry) |
| 546 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
| 547 | "Unable to create '%s' fs entry\n", |
| 548 | ACPI_POWER_FILE_STATUS)); |
| 549 | else { |
| 550 | entry->proc_fops = &acpi_power_fops; |
| 551 | entry->data = acpi_driver_data(device); |
| 552 | } |
| 553 | |
| 554 | return_VALUE(0); |
| 555 | } |
| 556 | |
| 557 | |
| 558 | static int |
| 559 | acpi_power_remove_fs ( |
| 560 | struct acpi_device *device) |
| 561 | { |
| 562 | ACPI_FUNCTION_TRACE("acpi_power_remove_fs"); |
| 563 | |
| 564 | if (acpi_device_dir(device)) { |
| 565 | remove_proc_entry(ACPI_POWER_FILE_STATUS, |
| 566 | acpi_device_dir(device)); |
| 567 | remove_proc_entry(acpi_device_bid(device), acpi_power_dir); |
| 568 | acpi_device_dir(device) = NULL; |
| 569 | } |
| 570 | |
| 571 | return_VALUE(0); |
| 572 | } |
| 573 | |
| 574 | |
| 575 | /* -------------------------------------------------------------------------- |
| 576 | Driver Interface |
| 577 | -------------------------------------------------------------------------- */ |
| 578 | |
| 579 | static int |
| 580 | acpi_power_add ( |
| 581 | struct acpi_device *device) |
| 582 | { |
| 583 | int result = 0; |
| 584 | acpi_status status = AE_OK; |
| 585 | struct acpi_power_resource *resource = NULL; |
| 586 | union acpi_object acpi_object; |
| 587 | struct acpi_buffer buffer = {sizeof(acpi_object), &acpi_object}; |
| 588 | |
| 589 | ACPI_FUNCTION_TRACE("acpi_power_add"); |
| 590 | |
| 591 | if (!device) |
| 592 | return_VALUE(-EINVAL); |
| 593 | |
| 594 | resource = kmalloc(sizeof(struct acpi_power_resource), GFP_KERNEL); |
| 595 | if (!resource) |
| 596 | return_VALUE(-ENOMEM); |
| 597 | memset(resource, 0, sizeof(struct acpi_power_resource)); |
| 598 | |
| 599 | resource->handle = device->handle; |
| 600 | strcpy(resource->name, device->pnp.bus_id); |
| 601 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); |
| 602 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); |
| 603 | acpi_driver_data(device) = resource; |
| 604 | |
| 605 | /* Evalute the object to get the system level and resource order. */ |
| 606 | status = acpi_evaluate_object(resource->handle, NULL, NULL, &buffer); |
| 607 | if (ACPI_FAILURE(status)) { |
| 608 | result = -ENODEV; |
| 609 | goto end; |
| 610 | } |
| 611 | resource->system_level = acpi_object.power_resource.system_level; |
| 612 | resource->order = acpi_object.power_resource.resource_order; |
| 613 | |
| 614 | result = acpi_power_get_state(resource); |
| 615 | if (result) |
| 616 | goto end; |
| 617 | |
| 618 | switch (resource->state) { |
| 619 | case ACPI_POWER_RESOURCE_STATE_ON: |
| 620 | device->power.state = ACPI_STATE_D0; |
| 621 | break; |
| 622 | case ACPI_POWER_RESOURCE_STATE_OFF: |
| 623 | device->power.state = ACPI_STATE_D3; |
| 624 | break; |
| 625 | default: |
| 626 | device->power.state = ACPI_STATE_UNKNOWN; |
| 627 | break; |
| 628 | } |
| 629 | |
| 630 | result = acpi_power_add_fs(device); |
| 631 | if (result) |
| 632 | goto end; |
| 633 | |
| 634 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
| 635 | acpi_device_bid(device), resource->state?"on":"off"); |
| 636 | |
| 637 | end: |
| 638 | if (result) |
| 639 | kfree(resource); |
| 640 | |
| 641 | return_VALUE(result); |
| 642 | } |
| 643 | |
| 644 | |
| 645 | static int |
| 646 | acpi_power_remove ( |
| 647 | struct acpi_device *device, |
| 648 | int type) |
| 649 | { |
| 650 | struct acpi_power_resource *resource = NULL; |
| 651 | |
| 652 | ACPI_FUNCTION_TRACE("acpi_power_remove"); |
| 653 | |
| 654 | if (!device || !acpi_driver_data(device)) |
| 655 | return_VALUE(-EINVAL); |
| 656 | |
| 657 | resource = (struct acpi_power_resource *) acpi_driver_data(device); |
| 658 | |
| 659 | acpi_power_remove_fs(device); |
| 660 | |
| 661 | kfree(resource); |
| 662 | |
| 663 | return_VALUE(0); |
| 664 | } |
| 665 | |
| 666 | |
| 667 | static int __init acpi_power_init (void) |
| 668 | { |
| 669 | int result = 0; |
| 670 | |
| 671 | ACPI_FUNCTION_TRACE("acpi_power_init"); |
| 672 | |
| 673 | if (acpi_disabled) |
| 674 | return_VALUE(0); |
| 675 | |
| 676 | INIT_LIST_HEAD(&acpi_power_resource_list); |
| 677 | |
| 678 | acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir); |
| 679 | if (!acpi_power_dir) |
| 680 | return_VALUE(-ENODEV); |
| 681 | |
| 682 | result = acpi_bus_register_driver(&acpi_power_driver); |
| 683 | if (result < 0) { |
| 684 | remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir); |
| 685 | return_VALUE(-ENODEV); |
| 686 | } |
| 687 | |
| 688 | return_VALUE(0); |
| 689 | } |
| 690 | |
| 691 | subsys_initcall(acpi_power_init); |
| 692 | |