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