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