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