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 <acpi/acpi_bus.h> 34 #include <acpi/acpi_drivers.h> 35 36 #define PREFIX "ACPI: " 37 38 #define ACPI_BUTTON_CLASS "button" 39 #define ACPI_BUTTON_FILE_INFO "info" 40 #define ACPI_BUTTON_FILE_STATE "state" 41 #define ACPI_BUTTON_TYPE_UNKNOWN 0x00 42 #define ACPI_BUTTON_NOTIFY_STATUS 0x80 43 44 #define ACPI_BUTTON_SUBCLASS_POWER "power" 45 #define ACPI_BUTTON_HID_POWER "PNP0C0C" 46 #define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button" 47 #define ACPI_BUTTON_TYPE_POWER 0x01 48 49 #define ACPI_BUTTON_SUBCLASS_SLEEP "sleep" 50 #define ACPI_BUTTON_HID_SLEEP "PNP0C0E" 51 #define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button" 52 #define ACPI_BUTTON_TYPE_SLEEP 0x03 53 54 #define ACPI_BUTTON_SUBCLASS_LID "lid" 55 #define ACPI_BUTTON_HID_LID "PNP0C0D" 56 #define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch" 57 #define ACPI_BUTTON_TYPE_LID 0x05 58 59 #define _COMPONENT ACPI_BUTTON_COMPONENT 60 ACPI_MODULE_NAME("button"); 61 62 MODULE_AUTHOR("Paul Diefenbaugh"); 63 MODULE_DESCRIPTION("ACPI Button Driver"); 64 MODULE_LICENSE("GPL"); 65 66 static const struct acpi_device_id button_device_ids[] = { 67 {ACPI_BUTTON_HID_LID, 0}, 68 {ACPI_BUTTON_HID_SLEEP, 0}, 69 {ACPI_BUTTON_HID_SLEEPF, 0}, 70 {ACPI_BUTTON_HID_POWER, 0}, 71 {ACPI_BUTTON_HID_POWERF, 0}, 72 {"", 0}, 73 }; 74 MODULE_DEVICE_TABLE(acpi, button_device_ids); 75 76 static int acpi_button_add(struct acpi_device *device); 77 static int acpi_button_remove(struct acpi_device *device, int type); 78 static int acpi_button_resume(struct acpi_device *device); 79 static void acpi_button_notify(struct acpi_device *device, u32 event); 80 static int acpi_button_info_open_fs(struct inode *inode, struct file *file); 81 static int acpi_button_state_open_fs(struct inode *inode, struct file *file); 82 83 static struct acpi_driver acpi_button_driver = { 84 .name = "button", 85 .class = ACPI_BUTTON_CLASS, 86 .ids = button_device_ids, 87 .ops = { 88 .add = acpi_button_add, 89 .resume = acpi_button_resume, 90 .remove = acpi_button_remove, 91 .notify = acpi_button_notify, 92 }, 93 }; 94 95 struct acpi_button { 96 unsigned int type; 97 struct input_dev *input; 98 char phys[32]; /* for input device */ 99 unsigned long pushed; 100 }; 101 102 static const struct file_operations acpi_button_info_fops = { 103 .owner = THIS_MODULE, 104 .open = acpi_button_info_open_fs, 105 .read = seq_read, 106 .llseek = seq_lseek, 107 .release = single_release, 108 }; 109 110 static const struct file_operations acpi_button_state_fops = { 111 .owner = THIS_MODULE, 112 .open = acpi_button_state_open_fs, 113 .read = seq_read, 114 .llseek = seq_lseek, 115 .release = single_release, 116 }; 117 118 /* -------------------------------------------------------------------------- 119 FS Interface (/proc) 120 -------------------------------------------------------------------------- */ 121 122 static struct proc_dir_entry *acpi_button_dir; 123 124 static int acpi_button_info_seq_show(struct seq_file *seq, void *offset) 125 { 126 struct acpi_device *device = seq->private; 127 128 seq_printf(seq, "type: %s\n", 129 acpi_device_name(device)); 130 return 0; 131 } 132 133 static int acpi_button_info_open_fs(struct inode *inode, struct file *file) 134 { 135 return single_open(file, acpi_button_info_seq_show, PDE(inode)->data); 136 } 137 138 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset) 139 { 140 struct acpi_device *device = seq->private; 141 acpi_status status; 142 unsigned long long state; 143 144 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state); 145 seq_printf(seq, "state: %s\n", 146 ACPI_FAILURE(status) ? "unsupported" : 147 (state ? "open" : "closed")); 148 return 0; 149 } 150 151 static int acpi_button_state_open_fs(struct inode *inode, struct file *file) 152 { 153 return single_open(file, acpi_button_state_seq_show, PDE(inode)->data); 154 } 155 156 static struct proc_dir_entry *acpi_power_dir; 157 static struct proc_dir_entry *acpi_sleep_dir; 158 static struct proc_dir_entry *acpi_lid_dir; 159 160 static int acpi_button_add_fs(struct acpi_device *device) 161 { 162 struct acpi_button *button = acpi_driver_data(device); 163 struct proc_dir_entry *entry = NULL; 164 165 switch (button->type) { 166 case ACPI_BUTTON_TYPE_POWER: 167 if (!acpi_power_dir) 168 acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER, 169 acpi_button_dir); 170 entry = acpi_power_dir; 171 break; 172 case ACPI_BUTTON_TYPE_SLEEP: 173 if (!acpi_sleep_dir) 174 acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP, 175 acpi_button_dir); 176 entry = acpi_sleep_dir; 177 break; 178 case ACPI_BUTTON_TYPE_LID: 179 if (!acpi_lid_dir) 180 acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, 181 acpi_button_dir); 182 entry = acpi_lid_dir; 183 break; 184 } 185 186 if (!entry) 187 return -ENODEV; 188 189 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry); 190 if (!acpi_device_dir(device)) 191 return -ENODEV; 192 193 /* 'info' [R] */ 194 entry = proc_create_data(ACPI_BUTTON_FILE_INFO, 195 S_IRUGO, acpi_device_dir(device), 196 &acpi_button_info_fops, device); 197 if (!entry) 198 return -ENODEV; 199 200 /* show lid state [R] */ 201 if (button->type == ACPI_BUTTON_TYPE_LID) { 202 entry = proc_create_data(ACPI_BUTTON_FILE_STATE, 203 S_IRUGO, acpi_device_dir(device), 204 &acpi_button_state_fops, device); 205 if (!entry) 206 return -ENODEV; 207 } 208 209 return 0; 210 } 211 212 static int acpi_button_remove_fs(struct acpi_device *device) 213 { 214 struct acpi_button *button = acpi_driver_data(device); 215 216 if (acpi_device_dir(device)) { 217 if (button->type == ACPI_BUTTON_TYPE_LID) 218 remove_proc_entry(ACPI_BUTTON_FILE_STATE, 219 acpi_device_dir(device)); 220 remove_proc_entry(ACPI_BUTTON_FILE_INFO, 221 acpi_device_dir(device)); 222 223 remove_proc_entry(acpi_device_bid(device), 224 acpi_device_dir(device)->parent); 225 acpi_device_dir(device) = NULL; 226 } 227 228 return 0; 229 } 230 231 /* -------------------------------------------------------------------------- 232 Driver Interface 233 -------------------------------------------------------------------------- */ 234 static int acpi_lid_send_state(struct acpi_device *device) 235 { 236 struct acpi_button *button = acpi_driver_data(device); 237 unsigned long long state; 238 acpi_status status; 239 240 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state); 241 if (ACPI_FAILURE(status)) 242 return -ENODEV; 243 244 /* input layer checks if event is redundant */ 245 input_report_switch(button->input, SW_LID, !state); 246 input_sync(button->input); 247 return 0; 248 } 249 250 static void acpi_button_notify(struct acpi_device *device, u32 event) 251 { 252 struct acpi_button *button = acpi_driver_data(device); 253 struct input_dev *input; 254 255 switch (event) { 256 case ACPI_FIXED_HARDWARE_EVENT: 257 event = ACPI_BUTTON_NOTIFY_STATUS; 258 /* fall through */ 259 case ACPI_BUTTON_NOTIFY_STATUS: 260 input = button->input; 261 if (button->type == ACPI_BUTTON_TYPE_LID) { 262 acpi_lid_send_state(device); 263 } else { 264 int keycode = test_bit(KEY_SLEEP, input->keybit) ? 265 KEY_SLEEP : KEY_POWER; 266 267 input_report_key(input, keycode, 1); 268 input_sync(input); 269 input_report_key(input, keycode, 0); 270 input_sync(input); 271 } 272 273 acpi_bus_generate_proc_event(device, event, ++button->pushed); 274 break; 275 default: 276 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 277 "Unsupported event [0x%x]\n", event)); 278 break; 279 } 280 } 281 282 static int acpi_button_resume(struct acpi_device *device) 283 { 284 struct acpi_button *button = acpi_driver_data(device); 285 286 if (button->type == ACPI_BUTTON_TYPE_LID) 287 return acpi_lid_send_state(device); 288 return 0; 289 } 290 291 static int acpi_button_add(struct acpi_device *device) 292 { 293 struct acpi_button *button; 294 struct input_dev *input; 295 char *hid, *name, *class; 296 int error; 297 298 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL); 299 if (!button) 300 return -ENOMEM; 301 302 device->driver_data = button; 303 304 button->input = input = input_allocate_device(); 305 if (!input) { 306 error = -ENOMEM; 307 goto err_free_button; 308 } 309 310 hid = acpi_device_hid(device); 311 name = acpi_device_name(device); 312 class = acpi_device_class(device); 313 314 if (!strcmp(hid, ACPI_BUTTON_HID_POWER) || 315 !strcmp(hid, ACPI_BUTTON_HID_POWERF)) { 316 button->type = ACPI_BUTTON_TYPE_POWER; 317 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER); 318 sprintf(class, "%s/%s", 319 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER); 320 } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) || 321 !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) { 322 button->type = ACPI_BUTTON_TYPE_SLEEP; 323 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP); 324 sprintf(class, "%s/%s", 325 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP); 326 } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) { 327 button->type = ACPI_BUTTON_TYPE_LID; 328 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID); 329 sprintf(class, "%s/%s", 330 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID); 331 } else { 332 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid); 333 error = -ENODEV; 334 goto err_free_input; 335 } 336 337 error = acpi_button_add_fs(device); 338 if (error) 339 goto err_free_input; 340 341 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid); 342 343 input->name = name; 344 input->phys = button->phys; 345 input->id.bustype = BUS_HOST; 346 input->id.product = button->type; 347 input->dev.parent = &device->dev; 348 349 switch (button->type) { 350 case ACPI_BUTTON_TYPE_POWER: 351 input->evbit[0] = BIT_MASK(EV_KEY); 352 set_bit(KEY_POWER, input->keybit); 353 break; 354 355 case ACPI_BUTTON_TYPE_SLEEP: 356 input->evbit[0] = BIT_MASK(EV_KEY); 357 set_bit(KEY_SLEEP, input->keybit); 358 break; 359 360 case ACPI_BUTTON_TYPE_LID: 361 input->evbit[0] = BIT_MASK(EV_SW); 362 set_bit(SW_LID, input->swbit); 363 break; 364 } 365 366 error = input_register_device(input); 367 if (error) 368 goto err_remove_fs; 369 if (button->type == ACPI_BUTTON_TYPE_LID) 370 acpi_lid_send_state(device); 371 372 if (device->wakeup.flags.valid) { 373 /* Button's GPE is run-wake GPE */ 374 acpi_set_gpe_type(device->wakeup.gpe_device, 375 device->wakeup.gpe_number, 376 ACPI_GPE_TYPE_WAKE_RUN); 377 acpi_enable_gpe(device->wakeup.gpe_device, 378 device->wakeup.gpe_number); 379 device->wakeup.state.enabled = 1; 380 } 381 382 printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device)); 383 return 0; 384 385 err_remove_fs: 386 acpi_button_remove_fs(device); 387 err_free_input: 388 input_free_device(input); 389 err_free_button: 390 kfree(button); 391 return error; 392 } 393 394 static int acpi_button_remove(struct acpi_device *device, int type) 395 { 396 struct acpi_button *button = acpi_driver_data(device); 397 398 acpi_button_remove_fs(device); 399 input_unregister_device(button->input); 400 kfree(button); 401 return 0; 402 } 403 404 static int __init acpi_button_init(void) 405 { 406 int result; 407 408 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir); 409 if (!acpi_button_dir) 410 return -ENODEV; 411 412 result = acpi_bus_register_driver(&acpi_button_driver); 413 if (result < 0) { 414 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); 415 return -ENODEV; 416 } 417 418 return 0; 419 } 420 421 static void __exit acpi_button_exit(void) 422 { 423 acpi_bus_unregister_driver(&acpi_button_driver); 424 425 if (acpi_power_dir) 426 remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir); 427 if (acpi_sleep_dir) 428 remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir); 429 if (acpi_lid_dir) 430 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); 431 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); 432 } 433 434 module_init(acpi_button_init); 435 module_exit(acpi_button_exit); 436