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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 20 */ 21 22 #include <linux/kernel.h> 23 #include <linux/module.h> 24 #include <linux/init.h> 25 #include <linux/types.h> 26 #include <linux/proc_fs.h> 27 #include <linux/seq_file.h> 28 #include <linux/input.h> 29 #include <linux/slab.h> 30 #include <linux/acpi.h> 31 #include <acpi/button.h> 32 33 #define PREFIX "ACPI: " 34 35 #define ACPI_BUTTON_CLASS "button" 36 #define ACPI_BUTTON_FILE_INFO "info" 37 #define ACPI_BUTTON_FILE_STATE "state" 38 #define ACPI_BUTTON_TYPE_UNKNOWN 0x00 39 #define ACPI_BUTTON_NOTIFY_STATUS 0x80 40 41 #define ACPI_BUTTON_SUBCLASS_POWER "power" 42 #define ACPI_BUTTON_HID_POWER "PNP0C0C" 43 #define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button" 44 #define ACPI_BUTTON_TYPE_POWER 0x01 45 46 #define ACPI_BUTTON_SUBCLASS_SLEEP "sleep" 47 #define ACPI_BUTTON_HID_SLEEP "PNP0C0E" 48 #define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button" 49 #define ACPI_BUTTON_TYPE_SLEEP 0x03 50 51 #define ACPI_BUTTON_SUBCLASS_LID "lid" 52 #define ACPI_BUTTON_HID_LID "PNP0C0D" 53 #define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch" 54 #define ACPI_BUTTON_TYPE_LID 0x05 55 56 #define _COMPONENT ACPI_BUTTON_COMPONENT 57 ACPI_MODULE_NAME("button"); 58 59 MODULE_AUTHOR("Paul Diefenbaugh"); 60 MODULE_DESCRIPTION("ACPI Button Driver"); 61 MODULE_LICENSE("GPL"); 62 63 static const struct acpi_device_id button_device_ids[] = { 64 {ACPI_BUTTON_HID_LID, 0}, 65 {ACPI_BUTTON_HID_SLEEP, 0}, 66 {ACPI_BUTTON_HID_SLEEPF, 0}, 67 {ACPI_BUTTON_HID_POWER, 0}, 68 {ACPI_BUTTON_HID_POWERF, 0}, 69 {"", 0}, 70 }; 71 MODULE_DEVICE_TABLE(acpi, button_device_ids); 72 73 static int acpi_button_add(struct acpi_device *device); 74 static int acpi_button_remove(struct acpi_device *device); 75 static void acpi_button_notify(struct acpi_device *device, u32 event); 76 77 #ifdef CONFIG_PM_SLEEP 78 static int acpi_button_suspend(struct device *dev); 79 static int acpi_button_resume(struct device *dev); 80 #else 81 #define acpi_button_suspend NULL 82 #define acpi_button_resume NULL 83 #endif 84 static SIMPLE_DEV_PM_OPS(acpi_button_pm, acpi_button_suspend, acpi_button_resume); 85 86 static struct acpi_driver acpi_button_driver = { 87 .name = "button", 88 .class = ACPI_BUTTON_CLASS, 89 .ids = button_device_ids, 90 .ops = { 91 .add = acpi_button_add, 92 .remove = acpi_button_remove, 93 .notify = acpi_button_notify, 94 }, 95 .drv.pm = &acpi_button_pm, 96 }; 97 98 struct acpi_button { 99 unsigned int type; 100 struct input_dev *input; 101 char phys[32]; /* for input device */ 102 unsigned long pushed; 103 bool suspended; 104 }; 105 106 static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier); 107 static struct acpi_device *lid_device; 108 109 /* -------------------------------------------------------------------------- 110 FS Interface (/proc) 111 -------------------------------------------------------------------------- */ 112 113 static struct proc_dir_entry *acpi_button_dir; 114 static struct proc_dir_entry *acpi_lid_dir; 115 116 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset) 117 { 118 struct acpi_device *device = seq->private; 119 acpi_status status; 120 unsigned long long state; 121 122 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state); 123 seq_printf(seq, "state: %s\n", 124 ACPI_FAILURE(status) ? "unsupported" : 125 (state ? "open" : "closed")); 126 return 0; 127 } 128 129 static int acpi_button_state_open_fs(struct inode *inode, struct file *file) 130 { 131 return single_open(file, acpi_button_state_seq_show, PDE_DATA(inode)); 132 } 133 134 static const struct file_operations acpi_button_state_fops = { 135 .owner = THIS_MODULE, 136 .open = acpi_button_state_open_fs, 137 .read = seq_read, 138 .llseek = seq_lseek, 139 .release = single_release, 140 }; 141 142 static int acpi_button_add_fs(struct acpi_device *device) 143 { 144 struct acpi_button *button = acpi_driver_data(device); 145 struct proc_dir_entry *entry = NULL; 146 int ret = 0; 147 148 /* procfs I/F for ACPI lid device only */ 149 if (button->type != ACPI_BUTTON_TYPE_LID) 150 return 0; 151 152 if (acpi_button_dir || acpi_lid_dir) { 153 printk(KERN_ERR PREFIX "More than one Lid device found!\n"); 154 return -EEXIST; 155 } 156 157 /* create /proc/acpi/button */ 158 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir); 159 if (!acpi_button_dir) 160 return -ENODEV; 161 162 /* create /proc/acpi/button/lid */ 163 acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); 164 if (!acpi_lid_dir) { 165 ret = -ENODEV; 166 goto remove_button_dir; 167 } 168 169 /* create /proc/acpi/button/lid/LID/ */ 170 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir); 171 if (!acpi_device_dir(device)) { 172 ret = -ENODEV; 173 goto remove_lid_dir; 174 } 175 176 /* create /proc/acpi/button/lid/LID/state */ 177 entry = proc_create_data(ACPI_BUTTON_FILE_STATE, 178 S_IRUGO, acpi_device_dir(device), 179 &acpi_button_state_fops, device); 180 if (!entry) { 181 ret = -ENODEV; 182 goto remove_dev_dir; 183 } 184 185 done: 186 return ret; 187 188 remove_dev_dir: 189 remove_proc_entry(acpi_device_bid(device), 190 acpi_lid_dir); 191 acpi_device_dir(device) = NULL; 192 remove_lid_dir: 193 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); 194 remove_button_dir: 195 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); 196 goto done; 197 } 198 199 static int acpi_button_remove_fs(struct acpi_device *device) 200 { 201 struct acpi_button *button = acpi_driver_data(device); 202 203 if (button->type != ACPI_BUTTON_TYPE_LID) 204 return 0; 205 206 remove_proc_entry(ACPI_BUTTON_FILE_STATE, 207 acpi_device_dir(device)); 208 remove_proc_entry(acpi_device_bid(device), 209 acpi_lid_dir); 210 acpi_device_dir(device) = NULL; 211 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); 212 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); 213 214 return 0; 215 } 216 217 /* -------------------------------------------------------------------------- 218 Driver Interface 219 -------------------------------------------------------------------------- */ 220 int acpi_lid_notifier_register(struct notifier_block *nb) 221 { 222 return blocking_notifier_chain_register(&acpi_lid_notifier, nb); 223 } 224 EXPORT_SYMBOL(acpi_lid_notifier_register); 225 226 int acpi_lid_notifier_unregister(struct notifier_block *nb) 227 { 228 return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb); 229 } 230 EXPORT_SYMBOL(acpi_lid_notifier_unregister); 231 232 int acpi_lid_open(void) 233 { 234 acpi_status status; 235 unsigned long long state; 236 237 if (!lid_device) 238 return -ENODEV; 239 240 status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL, 241 &state); 242 if (ACPI_FAILURE(status)) 243 return -ENODEV; 244 245 return !!state; 246 } 247 EXPORT_SYMBOL(acpi_lid_open); 248 249 static int acpi_lid_send_state(struct acpi_device *device) 250 { 251 struct acpi_button *button = acpi_driver_data(device); 252 unsigned long long state; 253 acpi_status status; 254 int ret; 255 256 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state); 257 if (ACPI_FAILURE(status)) 258 return -ENODEV; 259 260 /* input layer checks if event is redundant */ 261 input_report_switch(button->input, SW_LID, !state); 262 input_sync(button->input); 263 264 if (state) 265 pm_wakeup_event(&device->dev, 0); 266 267 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device); 268 if (ret == NOTIFY_DONE) 269 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, 270 device); 271 if (ret == NOTIFY_DONE || ret == NOTIFY_OK) { 272 /* 273 * It is also regarded as success if the notifier_chain 274 * returns NOTIFY_OK or NOTIFY_DONE. 275 */ 276 ret = 0; 277 } 278 return ret; 279 } 280 281 static void acpi_button_notify(struct acpi_device *device, u32 event) 282 { 283 struct acpi_button *button = acpi_driver_data(device); 284 struct input_dev *input; 285 286 switch (event) { 287 case ACPI_FIXED_HARDWARE_EVENT: 288 event = ACPI_BUTTON_NOTIFY_STATUS; 289 /* fall through */ 290 case ACPI_BUTTON_NOTIFY_STATUS: 291 input = button->input; 292 if (button->type == ACPI_BUTTON_TYPE_LID) { 293 acpi_lid_send_state(device); 294 } else { 295 int keycode; 296 297 pm_wakeup_event(&device->dev, 0); 298 if (button->suspended) 299 break; 300 301 keycode = test_bit(KEY_SLEEP, input->keybit) ? 302 KEY_SLEEP : KEY_POWER; 303 input_report_key(input, keycode, 1); 304 input_sync(input); 305 input_report_key(input, keycode, 0); 306 input_sync(input); 307 308 acpi_bus_generate_netlink_event( 309 device->pnp.device_class, 310 dev_name(&device->dev), 311 event, ++button->pushed); 312 } 313 break; 314 default: 315 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 316 "Unsupported event [0x%x]\n", event)); 317 break; 318 } 319 } 320 321 #ifdef CONFIG_PM_SLEEP 322 static int acpi_button_suspend(struct device *dev) 323 { 324 struct acpi_device *device = to_acpi_device(dev); 325 struct acpi_button *button = acpi_driver_data(device); 326 327 button->suspended = true; 328 return 0; 329 } 330 331 static int acpi_button_resume(struct device *dev) 332 { 333 struct acpi_device *device = to_acpi_device(dev); 334 struct acpi_button *button = acpi_driver_data(device); 335 336 button->suspended = false; 337 if (button->type == ACPI_BUTTON_TYPE_LID) 338 return acpi_lid_send_state(device); 339 return 0; 340 } 341 #endif 342 343 static int acpi_button_add(struct acpi_device *device) 344 { 345 struct acpi_button *button; 346 struct input_dev *input; 347 const char *hid = acpi_device_hid(device); 348 char *name, *class; 349 int error; 350 351 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL); 352 if (!button) 353 return -ENOMEM; 354 355 device->driver_data = button; 356 357 button->input = input = input_allocate_device(); 358 if (!input) { 359 error = -ENOMEM; 360 goto err_free_button; 361 } 362 363 name = acpi_device_name(device); 364 class = acpi_device_class(device); 365 366 if (!strcmp(hid, ACPI_BUTTON_HID_POWER) || 367 !strcmp(hid, ACPI_BUTTON_HID_POWERF)) { 368 button->type = ACPI_BUTTON_TYPE_POWER; 369 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER); 370 sprintf(class, "%s/%s", 371 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER); 372 } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) || 373 !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) { 374 button->type = ACPI_BUTTON_TYPE_SLEEP; 375 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP); 376 sprintf(class, "%s/%s", 377 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP); 378 } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) { 379 button->type = ACPI_BUTTON_TYPE_LID; 380 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID); 381 sprintf(class, "%s/%s", 382 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID); 383 } else { 384 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid); 385 error = -ENODEV; 386 goto err_free_input; 387 } 388 389 error = acpi_button_add_fs(device); 390 if (error) 391 goto err_free_input; 392 393 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid); 394 395 input->name = name; 396 input->phys = button->phys; 397 input->id.bustype = BUS_HOST; 398 input->id.product = button->type; 399 input->dev.parent = &device->dev; 400 401 switch (button->type) { 402 case ACPI_BUTTON_TYPE_POWER: 403 input_set_capability(input, EV_KEY, KEY_POWER); 404 break; 405 406 case ACPI_BUTTON_TYPE_SLEEP: 407 input_set_capability(input, EV_KEY, KEY_SLEEP); 408 break; 409 410 case ACPI_BUTTON_TYPE_LID: 411 input_set_capability(input, EV_SW, SW_LID); 412 break; 413 } 414 415 error = input_register_device(input); 416 if (error) 417 goto err_remove_fs; 418 if (button->type == ACPI_BUTTON_TYPE_LID) { 419 acpi_lid_send_state(device); 420 /* 421 * This assumes there's only one lid device, or if there are 422 * more we only care about the last one... 423 */ 424 lid_device = device; 425 } 426 427 printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device)); 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) 440 { 441 struct acpi_button *button = acpi_driver_data(device); 442 443 acpi_button_remove_fs(device); 444 input_unregister_device(button->input); 445 kfree(button); 446 return 0; 447 } 448 449 module_acpi_driver(acpi_button_driver); 450