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 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 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 return 0; 266 } 267 268 static void acpi_button_notify(acpi_handle handle, u32 event, void *data) 269 { 270 struct acpi_button *button = data; 271 struct input_dev *input; 272 273 if (!button || !button->device) 274 return; 275 276 switch (event) { 277 case ACPI_BUTTON_NOTIFY_STATUS: 278 input = button->input; 279 if (button->type == ACPI_BUTTON_TYPE_LID) { 280 acpi_lid_send_state(button); 281 } else { 282 int keycode = test_bit(KEY_SLEEP, input->keybit) ? 283 KEY_SLEEP : KEY_POWER; 284 285 input_report_key(input, keycode, 1); 286 input_sync(input); 287 input_report_key(input, keycode, 0); 288 } 289 input_sync(input); 290 291 acpi_bus_generate_proc_event(button->device, event, 292 ++button->pushed); 293 break; 294 default: 295 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 296 "Unsupported event [0x%x]\n", event)); 297 break; 298 } 299 300 return; 301 } 302 303 static acpi_status acpi_button_notify_fixed(void *data) 304 { 305 struct acpi_button *button = data; 306 307 if (!button) 308 return AE_BAD_PARAMETER; 309 310 acpi_button_notify(button->device->handle, ACPI_BUTTON_NOTIFY_STATUS, button); 311 312 return AE_OK; 313 } 314 315 static int acpi_button_install_notify_handlers(struct acpi_button *button) 316 { 317 acpi_status status; 318 319 switch (button->type) { 320 case ACPI_BUTTON_TYPE_POWERF: 321 status = 322 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 323 acpi_button_notify_fixed, 324 button); 325 break; 326 case ACPI_BUTTON_TYPE_SLEEPF: 327 status = 328 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 329 acpi_button_notify_fixed, 330 button); 331 break; 332 default: 333 status = acpi_install_notify_handler(button->device->handle, 334 ACPI_DEVICE_NOTIFY, 335 acpi_button_notify, 336 button); 337 break; 338 } 339 340 return ACPI_FAILURE(status) ? -ENODEV : 0; 341 } 342 343 static int acpi_button_resume(struct acpi_device *device) 344 { 345 struct acpi_button *button; 346 if (!device) 347 return -EINVAL; 348 button = acpi_driver_data(device); 349 if (button && button->type == ACPI_BUTTON_TYPE_LID) 350 return acpi_lid_send_state(button); 351 return 0; 352 } 353 354 static void acpi_button_remove_notify_handlers(struct acpi_button *button) 355 { 356 switch (button->type) { 357 case ACPI_BUTTON_TYPE_POWERF: 358 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 359 acpi_button_notify_fixed); 360 break; 361 case ACPI_BUTTON_TYPE_SLEEPF: 362 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 363 acpi_button_notify_fixed); 364 break; 365 default: 366 acpi_remove_notify_handler(button->device->handle, 367 ACPI_DEVICE_NOTIFY, 368 acpi_button_notify); 369 break; 370 } 371 } 372 373 static int acpi_button_add(struct acpi_device *device) 374 { 375 int error; 376 struct acpi_button *button; 377 struct input_dev *input; 378 379 if (!device) 380 return -EINVAL; 381 382 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL); 383 if (!button) 384 return -ENOMEM; 385 386 button->device = device; 387 acpi_driver_data(device) = button; 388 389 button->input = input = input_allocate_device(); 390 if (!input) { 391 error = -ENOMEM; 392 goto err_free_button; 393 } 394 395 /* 396 * Determine the button type (via hid), as fixed-feature buttons 397 * need to be handled a bit differently than generic-space. 398 */ 399 if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWER)) { 400 button->type = ACPI_BUTTON_TYPE_POWER; 401 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_POWER); 402 sprintf(acpi_device_class(device), "%s/%s", 403 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER); 404 } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF)) { 405 button->type = ACPI_BUTTON_TYPE_POWERF; 406 strcpy(acpi_device_name(device), 407 ACPI_BUTTON_DEVICE_NAME_POWERF); 408 sprintf(acpi_device_class(device), "%s/%s", 409 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER); 410 } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEP)) { 411 button->type = ACPI_BUTTON_TYPE_SLEEP; 412 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_SLEEP); 413 sprintf(acpi_device_class(device), "%s/%s", 414 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP); 415 } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF)) { 416 button->type = ACPI_BUTTON_TYPE_SLEEPF; 417 strcpy(acpi_device_name(device), 418 ACPI_BUTTON_DEVICE_NAME_SLEEPF); 419 sprintf(acpi_device_class(device), "%s/%s", 420 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP); 421 } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_LID)) { 422 button->type = ACPI_BUTTON_TYPE_LID; 423 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_LID); 424 sprintf(acpi_device_class(device), "%s/%s", 425 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID); 426 } else { 427 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", 428 acpi_device_hid(device)); 429 error = -ENODEV; 430 goto err_free_input; 431 } 432 433 error = acpi_button_add_fs(device); 434 if (error) 435 goto err_free_input; 436 437 error = acpi_button_install_notify_handlers(button); 438 if (error) 439 goto err_remove_fs; 440 441 snprintf(button->phys, sizeof(button->phys), 442 "%s/button/input0", acpi_device_hid(device)); 443 444 input->name = acpi_device_name(device); 445 input->phys = button->phys; 446 input->id.bustype = BUS_HOST; 447 input->id.product = button->type; 448 input->dev.parent = &device->dev; 449 450 switch (button->type) { 451 case ACPI_BUTTON_TYPE_POWER: 452 case ACPI_BUTTON_TYPE_POWERF: 453 input->evbit[0] = BIT_MASK(EV_KEY); 454 set_bit(KEY_POWER, input->keybit); 455 break; 456 457 case ACPI_BUTTON_TYPE_SLEEP: 458 case ACPI_BUTTON_TYPE_SLEEPF: 459 input->evbit[0] = BIT_MASK(EV_KEY); 460 set_bit(KEY_SLEEP, input->keybit); 461 break; 462 463 case ACPI_BUTTON_TYPE_LID: 464 input->evbit[0] = BIT_MASK(EV_SW); 465 set_bit(SW_LID, input->swbit); 466 break; 467 } 468 469 error = input_register_device(input); 470 if (error) 471 goto err_remove_handlers; 472 if (button->type == ACPI_BUTTON_TYPE_LID) 473 acpi_lid_send_state(button); 474 475 if (device->wakeup.flags.valid) { 476 /* Button's GPE is run-wake GPE */ 477 acpi_set_gpe_type(device->wakeup.gpe_device, 478 device->wakeup.gpe_number, 479 ACPI_GPE_TYPE_WAKE_RUN); 480 acpi_enable_gpe(device->wakeup.gpe_device, 481 device->wakeup.gpe_number, ACPI_NOT_ISR); 482 device->wakeup.state.enabled = 1; 483 } 484 485 printk(KERN_INFO PREFIX "%s [%s]\n", 486 acpi_device_name(device), acpi_device_bid(device)); 487 488 return 0; 489 490 err_remove_handlers: 491 acpi_button_remove_notify_handlers(button); 492 err_remove_fs: 493 acpi_button_remove_fs(device); 494 err_free_input: 495 input_free_device(input); 496 err_free_button: 497 kfree(button); 498 return error; 499 } 500 501 static int acpi_button_remove(struct acpi_device *device, int type) 502 { 503 struct acpi_button *button; 504 505 if (!device || !acpi_driver_data(device)) 506 return -EINVAL; 507 508 button = acpi_driver_data(device); 509 510 acpi_button_remove_notify_handlers(button); 511 acpi_button_remove_fs(device); 512 input_unregister_device(button->input); 513 kfree(button); 514 515 return 0; 516 } 517 518 static int __init acpi_button_init(void) 519 { 520 int result; 521 522 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir); 523 if (!acpi_button_dir) 524 return -ENODEV; 525 acpi_button_dir->owner = THIS_MODULE; 526 result = acpi_bus_register_driver(&acpi_button_driver); 527 if (result < 0) { 528 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); 529 return -ENODEV; 530 } 531 532 return 0; 533 } 534 535 static void __exit acpi_button_exit(void) 536 { 537 acpi_bus_unregister_driver(&acpi_button_driver); 538 539 if (acpi_power_dir) 540 remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir); 541 if (acpi_sleep_dir) 542 remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir); 543 if (acpi_lid_dir) 544 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); 545 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); 546 } 547 548 module_init(acpi_button_init); 549 module_exit(acpi_button_exit); 550