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 #include <acpi/button.h> 37 38 #define PREFIX "ACPI: " 39 40 #define ACPI_BUTTON_CLASS "button" 41 #define ACPI_BUTTON_FILE_INFO "info" 42 #define ACPI_BUTTON_FILE_STATE "state" 43 #define ACPI_BUTTON_TYPE_UNKNOWN 0x00 44 #define ACPI_BUTTON_NOTIFY_STATUS 0x80 45 46 #define ACPI_BUTTON_SUBCLASS_POWER "power" 47 #define ACPI_BUTTON_HID_POWER "PNP0C0C" 48 #define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button" 49 #define ACPI_BUTTON_TYPE_POWER 0x01 50 51 #define ACPI_BUTTON_SUBCLASS_SLEEP "sleep" 52 #define ACPI_BUTTON_HID_SLEEP "PNP0C0E" 53 #define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button" 54 #define ACPI_BUTTON_TYPE_SLEEP 0x03 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); 80 static void acpi_button_notify(struct acpi_device *device, u32 event); 81 82 #ifdef CONFIG_PM_SLEEP 83 static int acpi_button_resume(struct device *dev); 84 #endif 85 static SIMPLE_DEV_PM_OPS(acpi_button_pm, NULL, acpi_button_resume); 86 87 static struct acpi_driver acpi_button_driver = { 88 .name = "button", 89 .class = ACPI_BUTTON_CLASS, 90 .ids = button_device_ids, 91 .ops = { 92 .add = acpi_button_add, 93 .remove = acpi_button_remove, 94 .notify = acpi_button_notify, 95 }, 96 .drv.pm = &acpi_button_pm, 97 }; 98 99 struct acpi_button { 100 unsigned int type; 101 struct input_dev *input; 102 char phys[32]; /* for input device */ 103 unsigned long pushed; 104 bool wakeup_enabled; 105 }; 106 107 static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier); 108 static struct acpi_device *lid_device; 109 110 /* -------------------------------------------------------------------------- 111 FS Interface (/proc) 112 -------------------------------------------------------------------------- */ 113 114 static struct proc_dir_entry *acpi_button_dir; 115 static struct proc_dir_entry *acpi_lid_dir; 116 117 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset) 118 { 119 struct acpi_device *device = seq->private; 120 acpi_status status; 121 unsigned long long state; 122 123 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state); 124 seq_printf(seq, "state: %s\n", 125 ACPI_FAILURE(status) ? "unsupported" : 126 (state ? "open" : "closed")); 127 return 0; 128 } 129 130 static int acpi_button_state_open_fs(struct inode *inode, struct file *file) 131 { 132 return single_open(file, acpi_button_state_seq_show, PDE_DATA(inode)); 133 } 134 135 static const struct file_operations acpi_button_state_fops = { 136 .owner = THIS_MODULE, 137 .open = acpi_button_state_open_fs, 138 .read = seq_read, 139 .llseek = seq_lseek, 140 .release = single_release, 141 }; 142 143 static int acpi_button_add_fs(struct acpi_device *device) 144 { 145 struct acpi_button *button = acpi_driver_data(device); 146 struct proc_dir_entry *entry = NULL; 147 int ret = 0; 148 149 /* procfs I/F for ACPI lid device only */ 150 if (button->type != ACPI_BUTTON_TYPE_LID) 151 return 0; 152 153 if (acpi_button_dir || acpi_lid_dir) { 154 printk(KERN_ERR PREFIX "More than one Lid device found!\n"); 155 return -EEXIST; 156 } 157 158 /* create /proc/acpi/button */ 159 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir); 160 if (!acpi_button_dir) 161 return -ENODEV; 162 163 /* create /proc/acpi/button/lid */ 164 acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); 165 if (!acpi_lid_dir) { 166 ret = -ENODEV; 167 goto remove_button_dir; 168 } 169 170 /* create /proc/acpi/button/lid/LID/ */ 171 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir); 172 if (!acpi_device_dir(device)) { 173 ret = -ENODEV; 174 goto remove_lid_dir; 175 } 176 177 /* create /proc/acpi/button/lid/LID/state */ 178 entry = proc_create_data(ACPI_BUTTON_FILE_STATE, 179 S_IRUGO, acpi_device_dir(device), 180 &acpi_button_state_fops, device); 181 if (!entry) { 182 ret = -ENODEV; 183 goto remove_dev_dir; 184 } 185 186 done: 187 return ret; 188 189 remove_dev_dir: 190 remove_proc_entry(acpi_device_bid(device), 191 acpi_lid_dir); 192 acpi_device_dir(device) = NULL; 193 remove_lid_dir: 194 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); 195 remove_button_dir: 196 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); 197 goto done; 198 } 199 200 static int acpi_button_remove_fs(struct acpi_device *device) 201 { 202 struct acpi_button *button = acpi_driver_data(device); 203 204 if (button->type != ACPI_BUTTON_TYPE_LID) 205 return 0; 206 207 remove_proc_entry(ACPI_BUTTON_FILE_STATE, 208 acpi_device_dir(device)); 209 remove_proc_entry(acpi_device_bid(device), 210 acpi_lid_dir); 211 acpi_device_dir(device) = NULL; 212 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); 213 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); 214 215 return 0; 216 } 217 218 /* -------------------------------------------------------------------------- 219 Driver Interface 220 -------------------------------------------------------------------------- */ 221 int acpi_lid_notifier_register(struct notifier_block *nb) 222 { 223 return blocking_notifier_chain_register(&acpi_lid_notifier, nb); 224 } 225 EXPORT_SYMBOL(acpi_lid_notifier_register); 226 227 int acpi_lid_notifier_unregister(struct notifier_block *nb) 228 { 229 return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb); 230 } 231 EXPORT_SYMBOL(acpi_lid_notifier_unregister); 232 233 int acpi_lid_open(void) 234 { 235 acpi_status status; 236 unsigned long long state; 237 238 if (!lid_device) 239 return -ENODEV; 240 241 status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL, 242 &state); 243 if (ACPI_FAILURE(status)) 244 return -ENODEV; 245 246 return !!state; 247 } 248 EXPORT_SYMBOL(acpi_lid_open); 249 250 static int acpi_lid_send_state(struct acpi_device *device) 251 { 252 struct acpi_button *button = acpi_driver_data(device); 253 unsigned long long state; 254 acpi_status status; 255 int ret; 256 257 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state); 258 if (ACPI_FAILURE(status)) 259 return -ENODEV; 260 261 /* input layer checks if event is redundant */ 262 input_report_switch(button->input, SW_LID, !state); 263 input_sync(button->input); 264 265 if (state) 266 pm_wakeup_event(&device->dev, 0); 267 268 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device); 269 if (ret == NOTIFY_DONE) 270 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, 271 device); 272 if (ret == NOTIFY_DONE || ret == NOTIFY_OK) { 273 /* 274 * It is also regarded as success if the notifier_chain 275 * returns NOTIFY_OK or NOTIFY_DONE. 276 */ 277 ret = 0; 278 } 279 return ret; 280 } 281 282 static void acpi_button_notify(struct acpi_device *device, u32 event) 283 { 284 struct acpi_button *button = acpi_driver_data(device); 285 struct input_dev *input; 286 287 switch (event) { 288 case ACPI_FIXED_HARDWARE_EVENT: 289 event = ACPI_BUTTON_NOTIFY_STATUS; 290 /* fall through */ 291 case ACPI_BUTTON_NOTIFY_STATUS: 292 input = button->input; 293 if (button->type == ACPI_BUTTON_TYPE_LID) { 294 acpi_lid_send_state(device); 295 } else { 296 int keycode = test_bit(KEY_SLEEP, input->keybit) ? 297 KEY_SLEEP : KEY_POWER; 298 299 input_report_key(input, keycode, 1); 300 input_sync(input); 301 input_report_key(input, keycode, 0); 302 input_sync(input); 303 304 pm_wakeup_event(&device->dev, 0); 305 } 306 break; 307 default: 308 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 309 "Unsupported event [0x%x]\n", event)); 310 break; 311 } 312 } 313 314 #ifdef CONFIG_PM_SLEEP 315 static int acpi_button_resume(struct device *dev) 316 { 317 struct acpi_device *device = to_acpi_device(dev); 318 struct acpi_button *button = acpi_driver_data(device); 319 320 if (button->type == ACPI_BUTTON_TYPE_LID) 321 return acpi_lid_send_state(device); 322 return 0; 323 } 324 #endif 325 326 static int acpi_button_add(struct acpi_device *device) 327 { 328 struct acpi_button *button; 329 struct input_dev *input; 330 const char *hid = acpi_device_hid(device); 331 char *name, *class; 332 int error; 333 334 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL); 335 if (!button) 336 return -ENOMEM; 337 338 device->driver_data = button; 339 340 button->input = input = input_allocate_device(); 341 if (!input) { 342 error = -ENOMEM; 343 goto err_free_button; 344 } 345 346 name = acpi_device_name(device); 347 class = acpi_device_class(device); 348 349 if (!strcmp(hid, ACPI_BUTTON_HID_POWER) || 350 !strcmp(hid, ACPI_BUTTON_HID_POWERF)) { 351 button->type = ACPI_BUTTON_TYPE_POWER; 352 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER); 353 sprintf(class, "%s/%s", 354 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER); 355 } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) || 356 !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) { 357 button->type = ACPI_BUTTON_TYPE_SLEEP; 358 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP); 359 sprintf(class, "%s/%s", 360 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP); 361 } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) { 362 button->type = ACPI_BUTTON_TYPE_LID; 363 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID); 364 sprintf(class, "%s/%s", 365 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID); 366 } else { 367 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid); 368 error = -ENODEV; 369 goto err_free_input; 370 } 371 372 error = acpi_button_add_fs(device); 373 if (error) 374 goto err_free_input; 375 376 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid); 377 378 input->name = name; 379 input->phys = button->phys; 380 input->id.bustype = BUS_HOST; 381 input->id.product = button->type; 382 input->dev.parent = &device->dev; 383 384 switch (button->type) { 385 case ACPI_BUTTON_TYPE_POWER: 386 input_set_capability(input, EV_KEY, KEY_POWER); 387 break; 388 389 case ACPI_BUTTON_TYPE_SLEEP: 390 input_set_capability(input, EV_KEY, KEY_SLEEP); 391 break; 392 393 case ACPI_BUTTON_TYPE_LID: 394 input_set_capability(input, EV_SW, SW_LID); 395 break; 396 } 397 398 error = input_register_device(input); 399 if (error) 400 goto err_remove_fs; 401 if (button->type == ACPI_BUTTON_TYPE_LID) { 402 acpi_lid_send_state(device); 403 /* 404 * This assumes there's only one lid device, or if there are 405 * more we only care about the last one... 406 */ 407 lid_device = device; 408 } 409 410 if (device->wakeup.flags.valid) { 411 /* Button's GPE is run-wake GPE */ 412 acpi_enable_gpe(device->wakeup.gpe_device, 413 device->wakeup.gpe_number); 414 if (!device_may_wakeup(&device->dev)) { 415 device_set_wakeup_enable(&device->dev, true); 416 button->wakeup_enabled = true; 417 } 418 } 419 420 printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device)); 421 return 0; 422 423 err_remove_fs: 424 acpi_button_remove_fs(device); 425 err_free_input: 426 input_free_device(input); 427 err_free_button: 428 kfree(button); 429 return error; 430 } 431 432 static int acpi_button_remove(struct acpi_device *device) 433 { 434 struct acpi_button *button = acpi_driver_data(device); 435 436 if (device->wakeup.flags.valid) { 437 acpi_disable_gpe(device->wakeup.gpe_device, 438 device->wakeup.gpe_number); 439 if (button->wakeup_enabled) 440 device_set_wakeup_enable(&device->dev, false); 441 } 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