1 /* 2 * acpi_button.c - ACPI Button Driver ($Revision: 30 $) 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 #include <linux/kernel.h> 27 #include <linux/module.h> 28 #include <linux/init.h> 29 #include <linux/types.h> 30 #include <linux/proc_fs.h> 31 #include <linux/seq_file.h> 32 #include <linux/input.h> 33 #include <acpi/acpi_bus.h> 34 #include <acpi/acpi_drivers.h> 35 36 #define ACPI_BUTTON_COMPONENT 0x00080000 37 #define ACPI_BUTTON_CLASS "button" 38 #define ACPI_BUTTON_FILE_INFO "info" 39 #define ACPI_BUTTON_FILE_STATE "state" 40 #define ACPI_BUTTON_TYPE_UNKNOWN 0x00 41 #define ACPI_BUTTON_NOTIFY_STATUS 0x80 42 43 #define ACPI_BUTTON_SUBCLASS_POWER "power" 44 #define ACPI_BUTTON_HID_POWER "PNP0C0C" 45 #define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button (CM)" 46 #define ACPI_BUTTON_DEVICE_NAME_POWERF "Power Button (FF)" 47 #define ACPI_BUTTON_TYPE_POWER 0x01 48 #define ACPI_BUTTON_TYPE_POWERF 0x02 49 50 #define ACPI_BUTTON_SUBCLASS_SLEEP "sleep" 51 #define ACPI_BUTTON_HID_SLEEP "PNP0C0E" 52 #define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button (CM)" 53 #define ACPI_BUTTON_DEVICE_NAME_SLEEPF "Sleep Button (FF)" 54 #define ACPI_BUTTON_TYPE_SLEEP 0x03 55 #define ACPI_BUTTON_TYPE_SLEEPF 0x04 56 57 #define ACPI_BUTTON_SUBCLASS_LID "lid" 58 #define ACPI_BUTTON_HID_LID "PNP0C0D" 59 #define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch" 60 #define ACPI_BUTTON_TYPE_LID 0x05 61 62 #define _COMPONENT ACPI_BUTTON_COMPONENT 63 ACPI_MODULE_NAME("button"); 64 65 MODULE_AUTHOR("Paul Diefenbaugh"); 66 MODULE_DESCRIPTION("ACPI Button Driver"); 67 MODULE_LICENSE("GPL"); 68 69 static const struct acpi_device_id button_device_ids[] = { 70 {ACPI_BUTTON_HID_LID, 0}, 71 {ACPI_BUTTON_HID_SLEEP, 0}, 72 {ACPI_BUTTON_HID_SLEEPF, 0}, 73 {ACPI_BUTTON_HID_POWER, 0}, 74 {ACPI_BUTTON_HID_POWERF, 0}, 75 {"", 0}, 76 }; 77 MODULE_DEVICE_TABLE(acpi, button_device_ids); 78 79 static int acpi_button_add(struct acpi_device *device); 80 static int acpi_button_remove(struct acpi_device *device, int type); 81 static int acpi_button_resume(struct acpi_device *device); 82 static int acpi_button_info_open_fs(struct inode *inode, struct file *file); 83 static int acpi_button_state_open_fs(struct inode *inode, struct file *file); 84 85 static struct acpi_driver acpi_button_driver = { 86 .name = "button", 87 .class = ACPI_BUTTON_CLASS, 88 .ids = button_device_ids, 89 .ops = { 90 .add = acpi_button_add, 91 .resume = acpi_button_resume, 92 .remove = acpi_button_remove, 93 }, 94 }; 95 96 struct acpi_button { 97 struct acpi_device *device; /* Fixed button kludge */ 98 unsigned int type; 99 struct input_dev *input; 100 char phys[32]; /* for input device */ 101 unsigned long pushed; 102 }; 103 104 static const struct file_operations acpi_button_info_fops = { 105 .owner = THIS_MODULE, 106 .open = acpi_button_info_open_fs, 107 .read = seq_read, 108 .llseek = seq_lseek, 109 .release = single_release, 110 }; 111 112 static const struct file_operations acpi_button_state_fops = { 113 .owner = THIS_MODULE, 114 .open = acpi_button_state_open_fs, 115 .read = seq_read, 116 .llseek = seq_lseek, 117 .release = single_release, 118 }; 119 120 /* -------------------------------------------------------------------------- 121 FS Interface (/proc) 122 -------------------------------------------------------------------------- */ 123 124 static struct proc_dir_entry *acpi_button_dir; 125 126 static int acpi_button_info_seq_show(struct seq_file *seq, void *offset) 127 { 128 struct acpi_button *button = seq->private; 129 130 if (!button || !button->device) 131 return 0; 132 133 seq_printf(seq, "type: %s\n", 134 acpi_device_name(button->device)); 135 136 return 0; 137 } 138 139 static int acpi_button_info_open_fs(struct inode *inode, struct file *file) 140 { 141 return single_open(file, acpi_button_info_seq_show, PDE(inode)->data); 142 } 143 144 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset) 145 { 146 struct acpi_button *button = seq->private; 147 acpi_status status; 148 unsigned long long state; 149 150 if (!button || !button->device) 151 return 0; 152 153 status = acpi_evaluate_integer(button->device->handle, "_LID", NULL, &state); 154 seq_printf(seq, "state: %s\n", 155 ACPI_FAILURE(status) ? "unsupported" : 156 (state ? "open" : "closed")); 157 return 0; 158 } 159 160 static int acpi_button_state_open_fs(struct inode *inode, struct file *file) 161 { 162 return single_open(file, acpi_button_state_seq_show, PDE(inode)->data); 163 } 164 165 static struct proc_dir_entry *acpi_power_dir; 166 static struct proc_dir_entry *acpi_sleep_dir; 167 static struct proc_dir_entry *acpi_lid_dir; 168 169 static int acpi_button_add_fs(struct acpi_device *device) 170 { 171 struct proc_dir_entry *entry = NULL; 172 struct acpi_button *button; 173 174 if (!device || !acpi_driver_data(device)) 175 return -EINVAL; 176 177 button = acpi_driver_data(device); 178 179 switch (button->type) { 180 case ACPI_BUTTON_TYPE_POWER: 181 case ACPI_BUTTON_TYPE_POWERF: 182 if (!acpi_power_dir) 183 acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER, 184 acpi_button_dir); 185 entry = acpi_power_dir; 186 break; 187 case ACPI_BUTTON_TYPE_SLEEP: 188 case ACPI_BUTTON_TYPE_SLEEPF: 189 if (!acpi_sleep_dir) 190 acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP, 191 acpi_button_dir); 192 entry = acpi_sleep_dir; 193 break; 194 case ACPI_BUTTON_TYPE_LID: 195 if (!acpi_lid_dir) 196 acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, 197 acpi_button_dir); 198 entry = acpi_lid_dir; 199 break; 200 } 201 202 if (!entry) 203 return -ENODEV; 204 entry->owner = THIS_MODULE; 205 206 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry); 207 if (!acpi_device_dir(device)) 208 return -ENODEV; 209 acpi_device_dir(device)->owner = THIS_MODULE; 210 211 /* 'info' [R] */ 212 entry = proc_create_data(ACPI_BUTTON_FILE_INFO, 213 S_IRUGO, acpi_device_dir(device), 214 &acpi_button_info_fops, 215 acpi_driver_data(device)); 216 if (!entry) 217 return -ENODEV; 218 219 /* show lid state [R] */ 220 if (button->type == ACPI_BUTTON_TYPE_LID) { 221 entry = proc_create_data(ACPI_BUTTON_FILE_STATE, 222 S_IRUGO, acpi_device_dir(device), 223 &acpi_button_state_fops, 224 acpi_driver_data(device)); 225 if (!entry) 226 return -ENODEV; 227 } 228 229 return 0; 230 } 231 232 static int acpi_button_remove_fs(struct acpi_device *device) 233 { 234 struct acpi_button *button = acpi_driver_data(device); 235 236 if (acpi_device_dir(device)) { 237 if (button->type == ACPI_BUTTON_TYPE_LID) 238 remove_proc_entry(ACPI_BUTTON_FILE_STATE, 239 acpi_device_dir(device)); 240 remove_proc_entry(ACPI_BUTTON_FILE_INFO, 241 acpi_device_dir(device)); 242 243 remove_proc_entry(acpi_device_bid(device), 244 acpi_device_dir(device)->parent); 245 acpi_device_dir(device) = NULL; 246 } 247 248 return 0; 249 } 250 251 /* -------------------------------------------------------------------------- 252 Driver Interface 253 -------------------------------------------------------------------------- */ 254 static int acpi_lid_send_state(struct acpi_button *button) 255 { 256 unsigned long long state; 257 acpi_status status; 258 259 status = acpi_evaluate_integer(button->device->handle, "_LID", NULL, 260 &state); 261 if (ACPI_FAILURE(status)) 262 return -ENODEV; 263 /* input layer checks if event is redundant */ 264 input_report_switch(button->input, SW_LID, !state); 265 input_sync(button->input); 266 return 0; 267 } 268 269 static void acpi_button_notify(acpi_handle handle, u32 event, void *data) 270 { 271 struct acpi_button *button = data; 272 struct input_dev *input; 273 274 if (!button || !button->device) 275 return; 276 277 switch (event) { 278 case ACPI_BUTTON_NOTIFY_STATUS: 279 input = button->input; 280 if (button->type == ACPI_BUTTON_TYPE_LID) { 281 acpi_lid_send_state(button); 282 } else { 283 int keycode = test_bit(KEY_SLEEP, input->keybit) ? 284 KEY_SLEEP : KEY_POWER; 285 286 input_report_key(input, keycode, 1); 287 input_sync(input); 288 input_report_key(input, keycode, 0); 289 input_sync(input); 290 } 291 292 acpi_bus_generate_proc_event(button->device, event, 293 ++button->pushed); 294 break; 295 default: 296 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 297 "Unsupported event [0x%x]\n", event)); 298 break; 299 } 300 301 return; 302 } 303 304 static acpi_status acpi_button_notify_fixed(void *data) 305 { 306 struct acpi_button *button = data; 307 308 if (!button) 309 return AE_BAD_PARAMETER; 310 311 acpi_button_notify(button->device->handle, ACPI_BUTTON_NOTIFY_STATUS, button); 312 313 return AE_OK; 314 } 315 316 static int acpi_button_install_notify_handlers(struct acpi_button *button) 317 { 318 acpi_status status; 319 320 switch (button->type) { 321 case ACPI_BUTTON_TYPE_POWERF: 322 status = 323 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 324 acpi_button_notify_fixed, 325 button); 326 break; 327 case ACPI_BUTTON_TYPE_SLEEPF: 328 status = 329 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 330 acpi_button_notify_fixed, 331 button); 332 break; 333 default: 334 status = acpi_install_notify_handler(button->device->handle, 335 ACPI_DEVICE_NOTIFY, 336 acpi_button_notify, 337 button); 338 break; 339 } 340 341 return ACPI_FAILURE(status) ? -ENODEV : 0; 342 } 343 344 static int acpi_button_resume(struct acpi_device *device) 345 { 346 struct acpi_button *button; 347 if (!device) 348 return -EINVAL; 349 button = acpi_driver_data(device); 350 if (button && button->type == ACPI_BUTTON_TYPE_LID) 351 return acpi_lid_send_state(button); 352 return 0; 353 } 354 355 static void acpi_button_remove_notify_handlers(struct acpi_button *button) 356 { 357 switch (button->type) { 358 case ACPI_BUTTON_TYPE_POWERF: 359 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 360 acpi_button_notify_fixed); 361 break; 362 case ACPI_BUTTON_TYPE_SLEEPF: 363 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 364 acpi_button_notify_fixed); 365 break; 366 default: 367 acpi_remove_notify_handler(button->device->handle, 368 ACPI_DEVICE_NOTIFY, 369 acpi_button_notify); 370 break; 371 } 372 } 373 374 static int acpi_button_add(struct acpi_device *device) 375 { 376 int error; 377 struct acpi_button *button; 378 struct input_dev *input; 379 380 if (!device) 381 return -EINVAL; 382 383 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL); 384 if (!button) 385 return -ENOMEM; 386 387 button->device = device; 388 device->driver_data = button; 389 390 button->input = input = input_allocate_device(); 391 if (!input) { 392 error = -ENOMEM; 393 goto err_free_button; 394 } 395 396 /* 397 * Determine the button type (via hid), as fixed-feature buttons 398 * need to be handled a bit differently than generic-space. 399 */ 400 if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWER)) { 401 button->type = ACPI_BUTTON_TYPE_POWER; 402 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_POWER); 403 sprintf(acpi_device_class(device), "%s/%s", 404 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER); 405 } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF)) { 406 button->type = ACPI_BUTTON_TYPE_POWERF; 407 strcpy(acpi_device_name(device), 408 ACPI_BUTTON_DEVICE_NAME_POWERF); 409 sprintf(acpi_device_class(device), "%s/%s", 410 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER); 411 } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEP)) { 412 button->type = ACPI_BUTTON_TYPE_SLEEP; 413 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_SLEEP); 414 sprintf(acpi_device_class(device), "%s/%s", 415 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP); 416 } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF)) { 417 button->type = ACPI_BUTTON_TYPE_SLEEPF; 418 strcpy(acpi_device_name(device), 419 ACPI_BUTTON_DEVICE_NAME_SLEEPF); 420 sprintf(acpi_device_class(device), "%s/%s", 421 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP); 422 } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_LID)) { 423 button->type = ACPI_BUTTON_TYPE_LID; 424 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_LID); 425 sprintf(acpi_device_class(device), "%s/%s", 426 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID); 427 } else { 428 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", 429 acpi_device_hid(device)); 430 error = -ENODEV; 431 goto err_free_input; 432 } 433 434 error = acpi_button_add_fs(device); 435 if (error) 436 goto err_free_input; 437 438 error = acpi_button_install_notify_handlers(button); 439 if (error) 440 goto err_remove_fs; 441 442 snprintf(button->phys, sizeof(button->phys), 443 "%s/button/input0", acpi_device_hid(device)); 444 445 input->name = acpi_device_name(device); 446 input->phys = button->phys; 447 input->id.bustype = BUS_HOST; 448 input->id.product = button->type; 449 input->dev.parent = &device->dev; 450 451 switch (button->type) { 452 case ACPI_BUTTON_TYPE_POWER: 453 case ACPI_BUTTON_TYPE_POWERF: 454 input->evbit[0] = BIT_MASK(EV_KEY); 455 set_bit(KEY_POWER, input->keybit); 456 break; 457 458 case ACPI_BUTTON_TYPE_SLEEP: 459 case ACPI_BUTTON_TYPE_SLEEPF: 460 input->evbit[0] = BIT_MASK(EV_KEY); 461 set_bit(KEY_SLEEP, input->keybit); 462 break; 463 464 case ACPI_BUTTON_TYPE_LID: 465 input->evbit[0] = BIT_MASK(EV_SW); 466 set_bit(SW_LID, input->swbit); 467 break; 468 } 469 470 error = input_register_device(input); 471 if (error) 472 goto err_remove_handlers; 473 if (button->type == ACPI_BUTTON_TYPE_LID) 474 acpi_lid_send_state(button); 475 476 if (device->wakeup.flags.valid) { 477 /* Button's GPE is run-wake GPE */ 478 acpi_set_gpe_type(device->wakeup.gpe_device, 479 device->wakeup.gpe_number, 480 ACPI_GPE_TYPE_WAKE_RUN); 481 acpi_enable_gpe(device->wakeup.gpe_device, 482 device->wakeup.gpe_number, ACPI_NOT_ISR); 483 device->wakeup.state.enabled = 1; 484 } 485 486 printk(KERN_INFO PREFIX "%s [%s]\n", 487 acpi_device_name(device), acpi_device_bid(device)); 488 489 return 0; 490 491 err_remove_handlers: 492 acpi_button_remove_notify_handlers(button); 493 err_remove_fs: 494 acpi_button_remove_fs(device); 495 err_free_input: 496 input_free_device(input); 497 err_free_button: 498 kfree(button); 499 return error; 500 } 501 502 static int acpi_button_remove(struct acpi_device *device, int type) 503 { 504 struct acpi_button *button; 505 506 if (!device || !acpi_driver_data(device)) 507 return -EINVAL; 508 509 button = acpi_driver_data(device); 510 511 acpi_button_remove_notify_handlers(button); 512 acpi_button_remove_fs(device); 513 input_unregister_device(button->input); 514 kfree(button); 515 516 return 0; 517 } 518 519 static int __init acpi_button_init(void) 520 { 521 int result; 522 523 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir); 524 if (!acpi_button_dir) 525 return -ENODEV; 526 acpi_button_dir->owner = THIS_MODULE; 527 result = acpi_bus_register_driver(&acpi_button_driver); 528 if (result < 0) { 529 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); 530 return -ENODEV; 531 } 532 533 return 0; 534 } 535 536 static void __exit acpi_button_exit(void) 537 { 538 acpi_bus_unregister_driver(&acpi_button_driver); 539 540 if (acpi_power_dir) 541 remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir); 542 if (acpi_sleep_dir) 543 remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir); 544 if (acpi_lid_dir) 545 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); 546 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); 547 } 548 549 module_init(acpi_button_init); 550 module_exit(acpi_button_exit); 551