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