SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/acpi/button.c

   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 static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
 117 static struct acpi_device *lid_device;
 118
 119 /* --------------------------------------------------------------------------
 120                               FS Interface (/proc)
 121    -------------------------------------------------------------------------- */
 122
 123 static struct proc_dir_entry *acpi_button_dir;
 124
 125 static int acpi_button_info_seq_show(struct seq_file *seq, void *offset)
 126 {
 127         struct acpi_device *device = seq->private;
 128
 129         seq_printf(seq, "type:                    %s\n",
 130                    acpi_device_name(device));
 131         return 0;
 132 }
 133
 134 static int acpi_button_info_open_fs(struct inode *inode, struct file *file)
 135 {
 136         return single_open(file, acpi_button_info_seq_show, PDE(inode)->data);
 137 }
 138
 139 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
 140 {
 141         struct acpi_device *device = seq->private;
 142         acpi_status status;
 143         unsigned long long state;
 144
 145         status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
 146         seq_printf(seq, "state:      %s\n",
 147                    ACPI_FAILURE(status) ? "unsupported" :
 148                         (state ? "open" : "closed"));
 149         return 0;
 150 }
 151
 152 static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
 153 {
 154         return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
 155 }
 156
 157 static struct proc_dir_entry *acpi_power_dir;
 158 static struct proc_dir_entry *acpi_sleep_dir;
 159 static struct proc_dir_entry *acpi_lid_dir;
 160
 161 static int acpi_button_add_fs(struct acpi_device *device)
 162 {
 163         struct acpi_button *button = acpi_driver_data(device);
 164         struct proc_dir_entry *entry = NULL;
 165
 166         switch (button->type) {
 167         case ACPI_BUTTON_TYPE_POWER:
 168                 if (!acpi_power_dir)
 169                         acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER,
 170                                                     acpi_button_dir);
 171                 entry = acpi_power_dir;
 172                 break;
 173         case ACPI_BUTTON_TYPE_SLEEP:
 174                 if (!acpi_sleep_dir)
 175                         acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP,
 176                                                     acpi_button_dir);
 177                 entry = acpi_sleep_dir;
 178                 break;
 179         case ACPI_BUTTON_TYPE_LID:
 180                 if (!acpi_lid_dir)
 181                         acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID,
 182                                                   acpi_button_dir);
 183                 entry = acpi_lid_dir;
 184                 break;
 185         }
 186
 187         if (!entry)
 188                 return -ENODEV;
 189
 190         acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
 191         if (!acpi_device_dir(device))
 192                 return -ENODEV;
 193
 194         /* 'info' [R] */
 195         entry = proc_create_data(ACPI_BUTTON_FILE_INFO,
 196                                  S_IRUGO, acpi_device_dir(device),
 197                                  &acpi_button_info_fops, device);
 198         if (!entry)
 199                 return -ENODEV;
 200
 201         /* show lid state [R] */
 202         if (button->type == ACPI_BUTTON_TYPE_LID) {
 203                 entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
 204                                          S_IRUGO, acpi_device_dir(device),
 205                                          &acpi_button_state_fops, device);
 206                 if (!entry)
 207                         return -ENODEV;
 208         }
 209
 210         return 0;
 211 }
 212
 213 static int acpi_button_remove_fs(struct acpi_device *device)
 214 {
 215         struct acpi_button *button = acpi_driver_data(device);
 216
 217         if (acpi_device_dir(device)) {
 218                 if (button->type == ACPI_BUTTON_TYPE_LID)
 219                         remove_proc_entry(ACPI_BUTTON_FILE_STATE,
 220                                           acpi_device_dir(device));
 221                 remove_proc_entry(ACPI_BUTTON_FILE_INFO,
 222                                   acpi_device_dir(device));
 223
 224                 remove_proc_entry(acpi_device_bid(device),
 225                                   acpi_device_dir(device)->parent);
 226                 acpi_device_dir(device) = NULL;
 227         }
 228
 229         return 0;
 230 }
 231
 232 /* --------------------------------------------------------------------------
 233                                 Driver Interface
 234    -------------------------------------------------------------------------- */
 235 int acpi_lid_notifier_register(struct notifier_block *nb)
 236 {
 237         return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
 238 }
 239 EXPORT_SYMBOL(acpi_lid_notifier_register);
 240
 241 int acpi_lid_notifier_unregister(struct notifier_block *nb)
 242 {
 243         return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
 244 }
 245 EXPORT_SYMBOL(acpi_lid_notifier_unregister);
 246
 247 int acpi_lid_open(void)
 248 {
 249         acpi_status status;
 250         unsigned long long state;
 251
 252         status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
 253                                        &state);
 254         if (ACPI_FAILURE(status))
 255                 return -ENODEV;
 256
 257         return !!state;
 258 }
 259 EXPORT_SYMBOL(acpi_lid_open);
 260
 261 static int acpi_lid_send_state(struct acpi_device *device)
 262 {
 263         struct acpi_button *button = acpi_driver_data(device);
 264         unsigned long long state;
 265         acpi_status status;
 266         int ret;
 267
 268         status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
 269         if (ACPI_FAILURE(status))
 270                 return -ENODEV;
 271
 272         /* input layer checks if event is redundant */
 273         input_report_switch(button->input, SW_LID, !state);
 274         input_sync(button->input);
 275
 276         ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
 277         if (ret == NOTIFY_DONE)
 278                 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
 279                                                    device);
 280         return ret;
 281 }
 282
 283 static void acpi_button_notify(struct acpi_device *device, u32 event)
 284 {
 285         struct acpi_button *button = acpi_driver_data(device);
 286         struct input_dev *input;
 287
 288         switch (event) {
 289         case ACPI_FIXED_HARDWARE_EVENT:
 290                 event = ACPI_BUTTON_NOTIFY_STATUS;
 291                 /* fall through */
 292         case ACPI_BUTTON_NOTIFY_STATUS:
 293                 input = button->input;
 294                 if (button->type == ACPI_BUTTON_TYPE_LID) {
 295                         acpi_lid_send_state(device);
 296                 } else {
 297                         int keycode = test_bit(KEY_SLEEP, input->keybit) ?
 298                                                 KEY_SLEEP : KEY_POWER;
 299
 300                         input_report_key(input, keycode, 1);
 301                         input_sync(input);
 302                         input_report_key(input, keycode, 0);
 303                         input_sync(input);
 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 static int acpi_button_resume(struct acpi_device *device)
 316 {
 317         struct acpi_button *button = acpi_driver_data(device);
 318
 319         if (button->type == ACPI_BUTTON_TYPE_LID)
 320                 return acpi_lid_send_state(device);
 321         return 0;
 322 }
 323
 324 static int acpi_button_add(struct acpi_device *device)
 325 {
 326         struct acpi_button *button;
 327         struct input_dev *input;
 328         char *hid, *name, *class;
 329         int error;
 330
 331         button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
 332         if (!button)
 333                 return -ENOMEM;
 334
 335         device->driver_data = button;
 336
 337         button->input = input = input_allocate_device();
 338         if (!input) {
 339                 error = -ENOMEM;
 340                 goto err_free_button;
 341         }
 342
 343         hid = acpi_device_hid(device);
 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->evbit[0] = BIT_MASK(EV_KEY);
 385                 set_bit(KEY_POWER, input->keybit);
 386                 break;
 387
 388         case ACPI_BUTTON_TYPE_SLEEP:
 389                 input->evbit[0] = BIT_MASK(EV_KEY);
 390                 set_bit(KEY_SLEEP, input->keybit);
 391                 break;
 392
 393         case ACPI_BUTTON_TYPE_LID:
 394                 input->evbit[0] = BIT_MASK(EV_SW);
 395                 set_bit(SW_LID, input->swbit);
 396                 break;
 397         }
 398
 399         error = input_register_device(input);
 400         if (error)
 401                 goto err_remove_fs;
 402         if (button->type == ACPI_BUTTON_TYPE_LID) {
 403                 acpi_lid_send_state(device);
 404                 /*
 405                  * This assumes there's only one lid device, or if there are
 406                  * more we only care about the last one...
 407                  */
 408                 lid_device = device;
 409         }
 410
 411         if (device->wakeup.flags.valid) {
 412                 /* Button's GPE is run-wake GPE */
 413                 acpi_set_gpe_type(device->wakeup.gpe_device,
 414                                   device->wakeup.gpe_number,
 415                                   ACPI_GPE_TYPE_WAKE_RUN);
 416                 acpi_enable_gpe(device->wakeup.gpe_device,
 417                                 device->wakeup.gpe_number);
 418                 device->wakeup.state.enabled = 1;
 419         }
 420
 421         printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
 422         return 0;
 423
 424  err_remove_fs:
 425         acpi_button_remove_fs(device);
 426  err_free_input:
 427         input_free_device(input);
 428  err_free_button:
 429         kfree(button);
 430         return error;
 431 }
 432
 433 static int acpi_button_remove(struct acpi_device *device, int type)
 434 {
 435         struct acpi_button *button = acpi_driver_data(device);
 436
 437         acpi_button_remove_fs(device);
 438         input_unregister_device(button->input);
 439         kfree(button);
 440         return 0;
 441 }
 442
 443 static int __init acpi_button_init(void)
 444 {
 445         int result;
 446
 447         acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
 448         if (!acpi_button_dir)
 449                 return -ENODEV;
 450
 451         result = acpi_bus_register_driver(&acpi_button_driver);
 452         if (result < 0) {
 453                 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
 454                 return -ENODEV;
 455         }
 456
 457         return 0;
 458 }
 459
 460 static void __exit acpi_button_exit(void)
 461 {
 462         acpi_bus_unregister_driver(&acpi_button_driver);
 463
 464         if (acpi_power_dir)
 465                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir);
 466         if (acpi_sleep_dir)
 467                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir);
 468         if (acpi_lid_dir)
 469                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
 470         remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
 471 }
 472
 473 module_init(acpi_button_init);
 474 module_exit(acpi_button_exit);