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 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, int type); 79 static void acpi_button_notify(struct acpi_device *device, u32 event); 80 81 #ifdef CONFIG_PM_SLEEP 82 static int acpi_button_resume(struct device *dev); 83 #endif 84 static SIMPLE_DEV_PM_OPS(acpi_button_pm, NULL, 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 wakeup_enabled; 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(inode)->data); 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 = test_bit(KEY_SLEEP, input->keybit) ? 296 KEY_SLEEP : KEY_POWER; 297 298 input_report_key(input, keycode, 1); 299 input_sync(input); 300 input_report_key(input, keycode, 0); 301 input_sync(input); 302 303 pm_wakeup_event(&device->dev, 0); 304 } 305 306 acpi_bus_generate_proc_event(device, event, ++button->pushed); 307 break; 308 default: 309 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 310 "Unsupported event [0x%x]\n", event)); 311 break; 312 } 313 } 314 315 #ifdef CONFIG_PM_SLEEP 316 static int acpi_button_resume(struct device *dev) 317 { 318 struct acpi_device *device = to_acpi_device(dev); 319 struct acpi_button *button = acpi_driver_data(device); 320 321 if (button->type == ACPI_BUTTON_TYPE_LID) 322 return acpi_lid_send_state(device); 323 return 0; 324 } 325 #endif 326 327 static int acpi_button_add(struct acpi_device *device) 328 { 329 struct acpi_button *button; 330 struct input_dev *input; 331 const char *hid = acpi_device_hid(device); 332 char *name, *class; 333 int error; 334 335 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL); 336 if (!button) 337 return -ENOMEM; 338 339 device->driver_data = button; 340 341 button->input = input = input_allocate_device(); 342 if (!input) { 343 error = -ENOMEM; 344 goto err_free_button; 345 } 346 347 name = acpi_device_name(device); 348 class = acpi_device_class(device); 349 350 if (!strcmp(hid, ACPI_BUTTON_HID_POWER) || 351 !strcmp(hid, ACPI_BUTTON_HID_POWERF)) { 352 button->type = ACPI_BUTTON_TYPE_POWER; 353 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER); 354 sprintf(class, "%s/%s", 355 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER); 356 } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) || 357 !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) { 358 button->type = ACPI_BUTTON_TYPE_SLEEP; 359 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP); 360 sprintf(class, "%s/%s", 361 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP); 362 } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) { 363 button->type = ACPI_BUTTON_TYPE_LID; 364 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID); 365 sprintf(class, "%s/%s", 366 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID); 367 } else { 368 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid); 369 error = -ENODEV; 370 goto err_free_input; 371 } 372 373 error = acpi_button_add_fs(device); 374 if (error) 375 goto err_free_input; 376 377 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid); 378 379 input->name = name; 380 input->phys = button->phys; 381 input->id.bustype = BUS_HOST; 382 input->id.product = button->type; 383 input->dev.parent = &device->dev; 384 385 switch (button->type) { 386 case ACPI_BUTTON_TYPE_POWER: 387 input->evbit[0] = BIT_MASK(EV_KEY); 388 set_bit(KEY_POWER, input->keybit); 389 break; 390 391 case ACPI_BUTTON_TYPE_SLEEP: 392 input->evbit[0] = BIT_MASK(EV_KEY); 393 set_bit(KEY_SLEEP, input->keybit); 394 break; 395 396 case ACPI_BUTTON_TYPE_LID: 397 input->evbit[0] = BIT_MASK(EV_SW); 398 set_bit(SW_LID, input->swbit); 399 break; 400 } 401 402 error = input_register_device(input); 403 if (error) 404 goto err_remove_fs; 405 if (button->type == ACPI_BUTTON_TYPE_LID) { 406 acpi_lid_send_state(device); 407 /* 408 * This assumes there's only one lid device, or if there are 409 * more we only care about the last one... 410 */ 411 lid_device = device; 412 } 413 414 if (device->wakeup.flags.valid) { 415 /* Button's GPE is run-wake GPE */ 416 acpi_enable_gpe(device->wakeup.gpe_device, 417 device->wakeup.gpe_number); 418 if (!device_may_wakeup(&device->dev)) { 419 device_set_wakeup_enable(&device->dev, true); 420 button->wakeup_enabled = true; 421 } 422 } 423 424 printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device)); 425 return 0; 426 427 err_remove_fs: 428 acpi_button_remove_fs(device); 429 err_free_input: 430 input_free_device(input); 431 err_free_button: 432 kfree(button); 433 return error; 434 } 435 436 static int acpi_button_remove(struct acpi_device *device, int type) 437 { 438 struct acpi_button *button = acpi_driver_data(device); 439 440 if (device->wakeup.flags.valid) { 441 acpi_disable_gpe(device->wakeup.gpe_device, 442 device->wakeup.gpe_number); 443 if (button->wakeup_enabled) 444 device_set_wakeup_enable(&device->dev, false); 445 } 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