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 <linux/acpi.h> 35 #include <acpi/button.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); 79 static void acpi_button_notify(struct acpi_device *device, u32 event); 80 81 #ifdef CONFIG_PM_SLEEP 82 static int acpi_button_suspend(struct device *dev); 83 static int acpi_button_resume(struct device *dev); 84 #else 85 #define acpi_button_suspend NULL 86 #define acpi_button_resume NULL 87 #endif 88 static SIMPLE_DEV_PM_OPS(acpi_button_pm, acpi_button_suspend, acpi_button_resume); 89 90 static struct acpi_driver acpi_button_driver = { 91 .name = "button", 92 .class = ACPI_BUTTON_CLASS, 93 .ids = button_device_ids, 94 .ops = { 95 .add = acpi_button_add, 96 .remove = acpi_button_remove, 97 .notify = acpi_button_notify, 98 }, 99 .drv.pm = &acpi_button_pm, 100 }; 101 102 struct acpi_button { 103 unsigned int type; 104 struct input_dev *input; 105 char phys[32]; /* for input device */ 106 unsigned long pushed; 107 bool suspended; 108 }; 109 110 static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier); 111 static struct acpi_device *lid_device; 112 113 /* -------------------------------------------------------------------------- 114 FS Interface (/proc) 115 -------------------------------------------------------------------------- */ 116 117 static struct proc_dir_entry *acpi_button_dir; 118 static struct proc_dir_entry *acpi_lid_dir; 119 120 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset) 121 { 122 struct acpi_device *device = seq->private; 123 acpi_status status; 124 unsigned long long state; 125 126 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state); 127 seq_printf(seq, "state: %s\n", 128 ACPI_FAILURE(status) ? "unsupported" : 129 (state ? "open" : "closed")); 130 return 0; 131 } 132 133 static int acpi_button_state_open_fs(struct inode *inode, struct file *file) 134 { 135 return single_open(file, acpi_button_state_seq_show, PDE_DATA(inode)); 136 } 137 138 static const struct file_operations acpi_button_state_fops = { 139 .owner = THIS_MODULE, 140 .open = acpi_button_state_open_fs, 141 .read = seq_read, 142 .llseek = seq_lseek, 143 .release = single_release, 144 }; 145 146 static int acpi_button_add_fs(struct acpi_device *device) 147 { 148 struct acpi_button *button = acpi_driver_data(device); 149 struct proc_dir_entry *entry = NULL; 150 int ret = 0; 151 152 /* procfs I/F for ACPI lid device only */ 153 if (button->type != ACPI_BUTTON_TYPE_LID) 154 return 0; 155 156 if (acpi_button_dir || acpi_lid_dir) { 157 printk(KERN_ERR PREFIX "More than one Lid device found!\n"); 158 return -EEXIST; 159 } 160 161 /* create /proc/acpi/button */ 162 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir); 163 if (!acpi_button_dir) 164 return -ENODEV; 165 166 /* create /proc/acpi/button/lid */ 167 acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); 168 if (!acpi_lid_dir) { 169 ret = -ENODEV; 170 goto remove_button_dir; 171 } 172 173 /* create /proc/acpi/button/lid/LID/ */ 174 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir); 175 if (!acpi_device_dir(device)) { 176 ret = -ENODEV; 177 goto remove_lid_dir; 178 } 179 180 /* create /proc/acpi/button/lid/LID/state */ 181 entry = proc_create_data(ACPI_BUTTON_FILE_STATE, 182 S_IRUGO, acpi_device_dir(device), 183 &acpi_button_state_fops, device); 184 if (!entry) { 185 ret = -ENODEV; 186 goto remove_dev_dir; 187 } 188 189 done: 190 return ret; 191 192 remove_dev_dir: 193 remove_proc_entry(acpi_device_bid(device), 194 acpi_lid_dir); 195 acpi_device_dir(device) = NULL; 196 remove_lid_dir: 197 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); 198 remove_button_dir: 199 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); 200 goto done; 201 } 202 203 static int acpi_button_remove_fs(struct acpi_device *device) 204 { 205 struct acpi_button *button = acpi_driver_data(device); 206 207 if (button->type != ACPI_BUTTON_TYPE_LID) 208 return 0; 209 210 remove_proc_entry(ACPI_BUTTON_FILE_STATE, 211 acpi_device_dir(device)); 212 remove_proc_entry(acpi_device_bid(device), 213 acpi_lid_dir); 214 acpi_device_dir(device) = NULL; 215 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); 216 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); 217 218 return 0; 219 } 220 221 /* -------------------------------------------------------------------------- 222 Driver Interface 223 -------------------------------------------------------------------------- */ 224 int acpi_lid_notifier_register(struct notifier_block *nb) 225 { 226 return blocking_notifier_chain_register(&acpi_lid_notifier, nb); 227 } 228 EXPORT_SYMBOL(acpi_lid_notifier_register); 229 230 int acpi_lid_notifier_unregister(struct notifier_block *nb) 231 { 232 return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb); 233 } 234 EXPORT_SYMBOL(acpi_lid_notifier_unregister); 235 236 int acpi_lid_open(void) 237 { 238 acpi_status status; 239 unsigned long long state; 240 241 if (!lid_device) 242 return -ENODEV; 243 244 status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL, 245 &state); 246 if (ACPI_FAILURE(status)) 247 return -ENODEV; 248 249 return !!state; 250 } 251 EXPORT_SYMBOL(acpi_lid_open); 252 253 static int acpi_lid_send_state(struct acpi_device *device) 254 { 255 struct acpi_button *button = acpi_driver_data(device); 256 unsigned long long state; 257 acpi_status status; 258 int ret; 259 260 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state); 261 if (ACPI_FAILURE(status)) 262 return -ENODEV; 263 264 /* input layer checks if event is redundant */ 265 input_report_switch(button->input, SW_LID, !state); 266 input_sync(button->input); 267 268 if (state) 269 pm_wakeup_event(&device->dev, 0); 270 271 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device); 272 if (ret == NOTIFY_DONE) 273 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, 274 device); 275 if (ret == NOTIFY_DONE || ret == NOTIFY_OK) { 276 /* 277 * It is also regarded as success if the notifier_chain 278 * returns NOTIFY_OK or NOTIFY_DONE. 279 */ 280 ret = 0; 281 } 282 return ret; 283 } 284 285 static void acpi_button_notify(struct acpi_device *device, u32 event) 286 { 287 struct acpi_button *button = acpi_driver_data(device); 288 struct input_dev *input; 289 290 switch (event) { 291 case ACPI_FIXED_HARDWARE_EVENT: 292 event = ACPI_BUTTON_NOTIFY_STATUS; 293 /* fall through */ 294 case ACPI_BUTTON_NOTIFY_STATUS: 295 input = button->input; 296 if (button->type == ACPI_BUTTON_TYPE_LID) { 297 acpi_lid_send_state(device); 298 } else { 299 int keycode; 300 301 pm_wakeup_event(&device->dev, 0); 302 if (button->suspended) 303 break; 304 305 keycode = test_bit(KEY_SLEEP, input->keybit) ? 306 KEY_SLEEP : KEY_POWER; 307 input_report_key(input, keycode, 1); 308 input_sync(input); 309 input_report_key(input, keycode, 0); 310 input_sync(input); 311 312 acpi_bus_generate_netlink_event( 313 device->pnp.device_class, 314 dev_name(&device->dev), 315 event, ++button->pushed); 316 } 317 break; 318 default: 319 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 320 "Unsupported event [0x%x]\n", event)); 321 break; 322 } 323 } 324 325 #ifdef CONFIG_PM_SLEEP 326 static int acpi_button_suspend(struct device *dev) 327 { 328 struct acpi_device *device = to_acpi_device(dev); 329 struct acpi_button *button = acpi_driver_data(device); 330 331 button->suspended = true; 332 return 0; 333 } 334 335 static int acpi_button_resume(struct device *dev) 336 { 337 struct acpi_device *device = to_acpi_device(dev); 338 struct acpi_button *button = acpi_driver_data(device); 339 340 button->suspended = false; 341 if (button->type == ACPI_BUTTON_TYPE_LID) 342 return acpi_lid_send_state(device); 343 return 0; 344 } 345 #endif 346 347 static int acpi_button_add(struct acpi_device *device) 348 { 349 struct acpi_button *button; 350 struct input_dev *input; 351 const char *hid = acpi_device_hid(device); 352 char *name, *class; 353 int error; 354 355 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL); 356 if (!button) 357 return -ENOMEM; 358 359 device->driver_data = button; 360 361 button->input = input = input_allocate_device(); 362 if (!input) { 363 error = -ENOMEM; 364 goto err_free_button; 365 } 366 367 name = acpi_device_name(device); 368 class = acpi_device_class(device); 369 370 if (!strcmp(hid, ACPI_BUTTON_HID_POWER) || 371 !strcmp(hid, ACPI_BUTTON_HID_POWERF)) { 372 button->type = ACPI_BUTTON_TYPE_POWER; 373 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER); 374 sprintf(class, "%s/%s", 375 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER); 376 } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) || 377 !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) { 378 button->type = ACPI_BUTTON_TYPE_SLEEP; 379 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP); 380 sprintf(class, "%s/%s", 381 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP); 382 } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) { 383 button->type = ACPI_BUTTON_TYPE_LID; 384 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID); 385 sprintf(class, "%s/%s", 386 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID); 387 } else { 388 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid); 389 error = -ENODEV; 390 goto err_free_input; 391 } 392 393 error = acpi_button_add_fs(device); 394 if (error) 395 goto err_free_input; 396 397 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid); 398 399 input->name = name; 400 input->phys = button->phys; 401 input->id.bustype = BUS_HOST; 402 input->id.product = button->type; 403 input->dev.parent = &device->dev; 404 405 switch (button->type) { 406 case ACPI_BUTTON_TYPE_POWER: 407 input_set_capability(input, EV_KEY, KEY_POWER); 408 break; 409 410 case ACPI_BUTTON_TYPE_SLEEP: 411 input_set_capability(input, EV_KEY, KEY_SLEEP); 412 break; 413 414 case ACPI_BUTTON_TYPE_LID: 415 input_set_capability(input, EV_SW, SW_LID); 416 break; 417 } 418 419 error = input_register_device(input); 420 if (error) 421 goto err_remove_fs; 422 if (button->type == ACPI_BUTTON_TYPE_LID) { 423 acpi_lid_send_state(device); 424 /* 425 * This assumes there's only one lid device, or if there are 426 * more we only care about the last one... 427 */ 428 lid_device = device; 429 } 430 431 printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device)); 432 return 0; 433 434 err_remove_fs: 435 acpi_button_remove_fs(device); 436 err_free_input: 437 input_free_device(input); 438 err_free_button: 439 kfree(button); 440 return error; 441 } 442 443 static int acpi_button_remove(struct acpi_device *device) 444 { 445 struct acpi_button *button = acpi_driver_data(device); 446 447 acpi_button_remove_fs(device); 448 input_unregister_device(button->input); 449 kfree(button); 450 return 0; 451 } 452 453 module_acpi_driver(acpi_button_driver); 454