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