drivers/acpi/button.c

   1 /*
   2  *  acpi_button.c - ACPI Button Driver ($Revision: 30 $)
   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 <acpi/acpi_bus.h>
  33 #include <acpi/acpi_drivers.h>
  34
  35
  36 #define ACPI_BUTTON_COMPONENT           0x00080000
  37 #define ACPI_BUTTON_DRIVER_NAME         "ACPI Button Driver"
  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 (CM)"
  47 #define ACPI_BUTTON_DEVICE_NAME_POWERF  "Power Button (FF)"
  48 #define ACPI_BUTTON_TYPE_POWER          0x01
  49 #define ACPI_BUTTON_TYPE_POWERF         0x02
  50
  51 #define ACPI_BUTTON_SUBCLASS_SLEEP      "sleep"
  52 #define ACPI_BUTTON_HID_SLEEP           "PNP0C0E"
  53 #define ACPI_BUTTON_DEVICE_NAME_SLEEP   "Sleep Button (CM)"
  54 #define ACPI_BUTTON_DEVICE_NAME_SLEEPF  "Sleep Button (FF)"
  55 #define ACPI_BUTTON_TYPE_SLEEP          0x03
  56 #define ACPI_BUTTON_TYPE_SLEEPF         0x04
  57
  58 #define ACPI_BUTTON_SUBCLASS_LID        "lid"
  59 #define ACPI_BUTTON_HID_LID             "PNP0C0D"
  60 #define ACPI_BUTTON_DEVICE_NAME_LID     "Lid Switch"
  61 #define ACPI_BUTTON_TYPE_LID            0x05
  62
  63 #define _COMPONENT              ACPI_BUTTON_COMPONENT
  64 ACPI_MODULE_NAME                ("acpi_button")
  65
  66 MODULE_AUTHOR("Paul Diefenbaugh");
  67 MODULE_DESCRIPTION(ACPI_BUTTON_DRIVER_NAME);
  68 MODULE_LICENSE("GPL");
  69
  70
  71 static int acpi_button_add (struct acpi_device *device);
  72 static int acpi_button_remove (struct acpi_device *device, int type);
  73 static int acpi_button_info_open_fs(struct inode *inode, struct file *file);
  74 static int acpi_button_state_open_fs(struct inode *inode, struct file *file);
  75
  76 static struct acpi_driver acpi_button_driver = {
  77         .name =         ACPI_BUTTON_DRIVER_NAME,
  78         .class =        ACPI_BUTTON_CLASS,
  79         .ids =          "ACPI_FPB,ACPI_FSB,PNP0C0D,PNP0C0C,PNP0C0E",
  80         .ops =          {
  81                                 .add =          acpi_button_add,
  82                                 .remove =       acpi_button_remove,
  83                         },
  84 };
  85
  86 struct acpi_button {
  87         acpi_handle             handle;
  88         struct acpi_device      *device;        /* Fixed button kludge */
  89         u8                      type;
  90         unsigned long           pushed;
  91 };
  92
  93 static struct file_operations acpi_button_info_fops = {
  94         .open           = acpi_button_info_open_fs,
  95         .read           = seq_read,
  96         .llseek         = seq_lseek,
  97         .release        = single_release,
  98 };
  99
 100 static struct file_operations acpi_button_state_fops = {
 101         .open           = acpi_button_state_open_fs,
 102         .read           = seq_read,
 103         .llseek         = seq_lseek,
 104         .release        = single_release,
 105 };
 106 /* --------------------------------------------------------------------------
 107                               FS Interface (/proc)
 108    -------------------------------------------------------------------------- */
 109
 110 static struct proc_dir_entry    *acpi_button_dir;
 111
 112 static int acpi_button_info_seq_show(struct seq_file *seq, void *offset)
 113 {
 114         struct acpi_button      *button = (struct acpi_button *) seq->private;
 115
 116         ACPI_FUNCTION_TRACE("acpi_button_info_seq_show");
 117
 118         if (!button || !button->device)
 119                 return 0;
 120
 121         seq_printf(seq, "type:                    %s\n",
 122                 acpi_device_name(button->device));
 123
 124         return 0;
 125 }
 126
 127 static int acpi_button_info_open_fs(struct inode *inode, struct file *file)
 128 {
 129         return single_open(file, acpi_button_info_seq_show, PDE(inode)->data);
 130 }
 131
 132 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
 133 {
 134         struct acpi_button      *button = (struct acpi_button *) seq->private;
 135         acpi_status             status;
 136         unsigned long           state;
 137
 138         ACPI_FUNCTION_TRACE("acpi_button_state_seq_show");
 139
 140         if (!button || !button->device)
 141                 return 0;
 142
 143         status = acpi_evaluate_integer(button->handle,"_LID",NULL,&state);
 144         if (ACPI_FAILURE(status)) {
 145                 seq_printf(seq, "state:      unsupported\n");
 146         }
 147         else{
 148                 seq_printf(seq, "state:      %s\n", (state ? "open" : "closed"));
 149         }
 150
 151         return 0;
 152 }
 153
 154 static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
 155 {
 156         return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
 157 }
 158
 159 static int
 160 acpi_button_add_fs (
 161         struct acpi_device      *device)
 162 {
 163         struct proc_dir_entry   *entry = NULL;
 164         struct acpi_button      *button = NULL;
 165
 166         ACPI_FUNCTION_TRACE("acpi_button_add_fs");
 167
 168         if (!device || !acpi_driver_data(device))
 169                 return_VALUE(-EINVAL);
 170
 171         button = acpi_driver_data(device);
 172
 173         switch (button->type) {
 174         case ACPI_BUTTON_TYPE_POWER:
 175         case ACPI_BUTTON_TYPE_POWERF:
 176                         entry = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER,
 177                                 acpi_button_dir);
 178                 break;
 179         case ACPI_BUTTON_TYPE_SLEEP:
 180         case ACPI_BUTTON_TYPE_SLEEPF:
 181                         entry = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP,
 182                                 acpi_button_dir);
 183                 break;
 184         case ACPI_BUTTON_TYPE_LID:
 185                         entry = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID,
 186                                 acpi_button_dir);
 187                 break;
 188         }
 189
 190         if (!entry)
 191                 return_VALUE(-ENODEV);
 192         entry->owner = THIS_MODULE;
 193
 194         acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
 195         if (!acpi_device_dir(device))
 196                 return_VALUE(-ENODEV);
 197         acpi_device_dir(device)->owner = THIS_MODULE;
 198
 199         /* 'info' [R] */
 200         entry = create_proc_entry(ACPI_BUTTON_FILE_INFO,
 201                 S_IRUGO, acpi_device_dir(device));
 202         if (!entry)
 203                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 204                         "Unable to create '%s' fs entry\n",
 205                         ACPI_BUTTON_FILE_INFO));
 206         else {
 207                 entry->proc_fops = &acpi_button_info_fops;
 208                 entry->data = acpi_driver_data(device);
 209                 entry->owner = THIS_MODULE;
 210         }
 211
 212         /* show lid state [R] */
 213         if (button->type == ACPI_BUTTON_TYPE_LID) {
 214                 entry = create_proc_entry(ACPI_BUTTON_FILE_STATE,
 215                         S_IRUGO, acpi_device_dir(device));
 216                 if (!entry)
 217                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 218                                 "Unable to create '%s' fs entry\n",
 219                                 ACPI_BUTTON_FILE_INFO));
 220                 else {
 221                         entry->proc_fops = &acpi_button_state_fops;
 222                         entry->data = acpi_driver_data(device);
 223                         entry->owner = THIS_MODULE;
 224                 }
 225         }
 226
 227         return_VALUE(0);
 228 }
 229
 230
 231 static int
 232 acpi_button_remove_fs (
 233         struct acpi_device      *device)
 234 {
 235         struct acpi_button      *button = NULL;
 236
 237         ACPI_FUNCTION_TRACE("acpi_button_remove_fs");
 238
 239         button = acpi_driver_data(device);
 240         if (acpi_device_dir(device)) {
 241                 if (button->type == ACPI_BUTTON_TYPE_LID)
 242                         remove_proc_entry(ACPI_BUTTON_FILE_STATE,
 243                                              acpi_device_dir(device));
 244                 remove_proc_entry(ACPI_BUTTON_FILE_INFO,
 245                                      acpi_device_dir(device));
 246
 247                 remove_proc_entry(acpi_device_bid(device),
 248                                      acpi_device_dir(device)->parent);
 249
 250
 251                 switch (button->type) {
 252                         case ACPI_BUTTON_TYPE_POWER:
 253                         case ACPI_BUTTON_TYPE_POWERF:
 254                                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER,
 255                                         acpi_button_dir);
 256                                 break;
 257                         case ACPI_BUTTON_TYPE_SLEEP:
 258                         case ACPI_BUTTON_TYPE_SLEEPF:
 259                                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP,
 260                                         acpi_button_dir);
 261                                 break;
 262                         case ACPI_BUTTON_TYPE_LID:
 263                                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID,
 264                                         acpi_button_dir);
 265                                 break;
 266                 }
 267                 acpi_device_dir(device) = NULL;
 268         }
 269
 270         return_VALUE(0);
 271 }
 272
 273
 274 /* --------------------------------------------------------------------------
 275                                 Driver Interface
 276    -------------------------------------------------------------------------- */
 277
 278 void
 279 acpi_button_notify (
 280         acpi_handle             handle,
 281         u32                     event,
 282         void                    *data)
 283 {
 284         struct acpi_button      *button = (struct acpi_button *) data;
 285
 286         ACPI_FUNCTION_TRACE("acpi_button_notify");
 287
 288         if (!button || !button->device)
 289                 return_VOID;
 290
 291         switch (event) {
 292         case ACPI_BUTTON_NOTIFY_STATUS:
 293                 acpi_bus_generate_event(button->device, event, ++button->pushed);
 294                 break;
 295         default:
 296                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 297                         "Unsupported event [0x%x]\n", event));
 298                 break;
 299         }
 300
 301         return_VOID;
 302 }
 303
 304
 305 acpi_status
 306 acpi_button_notify_fixed (
 307         void                    *data)
 308 {
 309         struct acpi_button      *button = (struct acpi_button *) data;
 310
 311         ACPI_FUNCTION_TRACE("acpi_button_notify_fixed");
 312
 313         if (!button)
 314                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 315
 316         acpi_button_notify(button->handle, ACPI_BUTTON_NOTIFY_STATUS, button);
 317
 318         return_ACPI_STATUS(AE_OK);
 319 }
 320
 321
 322 static int
 323 acpi_button_add (
 324         struct acpi_device      *device)
 325 {
 326         int                     result = 0;
 327         acpi_status             status = AE_OK;
 328         struct acpi_button      *button = NULL;
 329
 330         static struct acpi_device *power_button;
 331         static struct acpi_device *sleep_button;
 332         static struct acpi_device *lid_button;
 333
 334         ACPI_FUNCTION_TRACE("acpi_button_add");
 335
 336         if (!device)
 337                 return_VALUE(-EINVAL);
 338
 339         button = kmalloc(sizeof(struct acpi_button), GFP_KERNEL);
 340         if (!button)
 341                 return_VALUE(-ENOMEM);
 342         memset(button, 0, sizeof(struct acpi_button));
 343
 344         button->device = device;
 345         button->handle = device->handle;
 346         acpi_driver_data(device) = button;
 347
 348         /*
 349          * Determine the button type (via hid), as fixed-feature buttons
 350          * need to be handled a bit differently than generic-space.
 351          */
 352         if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWER)) {
 353                 button->type = ACPI_BUTTON_TYPE_POWER;
 354                 strcpy(acpi_device_name(device),
 355                         ACPI_BUTTON_DEVICE_NAME_POWER);
 356                 sprintf(acpi_device_class(device), "%s/%s",
 357                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
 358         }
 359         else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF)) {
 360                 button->type = ACPI_BUTTON_TYPE_POWERF;
 361                 strcpy(acpi_device_name(device),
 362                         ACPI_BUTTON_DEVICE_NAME_POWERF);
 363                 sprintf(acpi_device_class(device), "%s/%s",
 364                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
 365         }
 366         else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEP)) {
 367                 button->type = ACPI_BUTTON_TYPE_SLEEP;
 368                 strcpy(acpi_device_name(device),
 369                         ACPI_BUTTON_DEVICE_NAME_SLEEP);
 370                 sprintf(acpi_device_class(device), "%s/%s",
 371                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
 372         }
 373         else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF)) {
 374                 button->type = ACPI_BUTTON_TYPE_SLEEPF;
 375                 strcpy(acpi_device_name(device),
 376                         ACPI_BUTTON_DEVICE_NAME_SLEEPF);
 377                 sprintf(acpi_device_class(device), "%s/%s",
 378                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
 379         }
 380         else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_LID)) {
 381                 button->type = ACPI_BUTTON_TYPE_LID;
 382                 strcpy(acpi_device_name(device),
 383                         ACPI_BUTTON_DEVICE_NAME_LID);
 384                 sprintf(acpi_device_class(device), "%s/%s",
 385                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
 386         }
 387         else {
 388                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unsupported hid [%s]\n",
 389                         acpi_device_hid(device)));
 390                 result = -ENODEV;
 391                 goto end;
 392         }
 393
 394         /*
 395          * Ensure only one button of each type is used.
 396          */
 397         switch (button->type) {
 398         case ACPI_BUTTON_TYPE_POWER:
 399         case ACPI_BUTTON_TYPE_POWERF:
 400                 if (!power_button)
 401                         power_button = device;
 402                 else {
 403                         kfree(button);
 404                         return_VALUE(-ENODEV);
 405                 }
 406                 break;
 407         case ACPI_BUTTON_TYPE_SLEEP:
 408         case ACPI_BUTTON_TYPE_SLEEPF:
 409                 if (!sleep_button)
 410                         sleep_button = device;
 411                 else {
 412                         kfree(button);
 413                         return_VALUE(-ENODEV);
 414                 }
 415                 break;
 416         case ACPI_BUTTON_TYPE_LID:
 417                 if (!lid_button)
 418                         lid_button = device;
 419                 else {
 420                         kfree(button);
 421                         return_VALUE(-ENODEV);
 422                 }
 423                 break;
 424         }
 425
 426         result = acpi_button_add_fs(device);
 427         if (result)
 428                 goto end;
 429
 430         switch (button->type) {
 431         case ACPI_BUTTON_TYPE_POWERF:
 432                 status = acpi_install_fixed_event_handler (
 433                         ACPI_EVENT_POWER_BUTTON,
 434                         acpi_button_notify_fixed,
 435                         button);
 436                 break;
 437         case ACPI_BUTTON_TYPE_SLEEPF:
 438                 status = acpi_install_fixed_event_handler (
 439                         ACPI_EVENT_SLEEP_BUTTON,
 440                         acpi_button_notify_fixed,
 441                         button);
 442                 break;
 443         default:
 444                 status = acpi_install_notify_handler (
 445                         button->handle,
 446                         ACPI_DEVICE_NOTIFY,
 447                         acpi_button_notify,
 448                         button);
 449                 break;
 450         }
 451
 452         if (ACPI_FAILURE(status)) {
 453                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 454                         "Error installing notify handler\n"));
 455                 result = -ENODEV;
 456                 goto end;
 457         }
 458
 459         printk(KERN_INFO PREFIX "%s [%s]\n",
 460                 acpi_device_name(device), acpi_device_bid(device));
 461
 462 end:
 463         if (result) {
 464                 acpi_button_remove_fs(device);
 465                 kfree(button);
 466         }
 467
 468         return_VALUE(result);
 469 }
 470
 471
 472 static int
 473 acpi_button_remove (struct acpi_device *device, int type)
 474 {
 475         acpi_status             status = 0;
 476         struct acpi_button      *button = NULL;
 477
 478         ACPI_FUNCTION_TRACE("acpi_button_remove");
 479
 480         if (!device || !acpi_driver_data(device))
 481                 return_VALUE(-EINVAL);
 482
 483         button = acpi_driver_data(device);
 484
 485         /* Unregister for device notifications. */
 486         switch (button->type) {
 487         case ACPI_BUTTON_TYPE_POWERF:
 488                 status = acpi_remove_fixed_event_handler(
 489                         ACPI_EVENT_POWER_BUTTON, acpi_button_notify_fixed);
 490                 break;
 491         case ACPI_BUTTON_TYPE_SLEEPF:
 492                 status = acpi_remove_fixed_event_handler(
 493                         ACPI_EVENT_SLEEP_BUTTON, acpi_button_notify_fixed);
 494                 break;
 495         default:
 496                 status = acpi_remove_notify_handler(button->handle,
 497                         ACPI_DEVICE_NOTIFY, acpi_button_notify);
 498                 break;
 499         }
 500
 501         if (ACPI_FAILURE(status))
 502                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 503                         "Error removing notify handler\n"));
 504
 505         acpi_button_remove_fs(device);
 506
 507         kfree(button);
 508
 509         return_VALUE(0);
 510 }
 511
 512
 513 static int __init
 514 acpi_button_init (void)
 515 {
 516         int                     result = 0;
 517
 518         ACPI_FUNCTION_TRACE("acpi_button_init");
 519
 520         acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
 521         if (!acpi_button_dir)
 522                 return_VALUE(-ENODEV);
 523         acpi_button_dir->owner = THIS_MODULE;
 524
 525         result = acpi_bus_register_driver(&acpi_button_driver);
 526         if (result < 0) {
 527                 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
 528                 return_VALUE(-ENODEV);
 529         }
 530
 531         return_VALUE(0);
 532 }
 533
 534
 535 static void __exit
 536 acpi_button_exit (void)
 537 {
 538         ACPI_FUNCTION_TRACE("acpi_button_exit");
 539
 540         acpi_bus_unregister_driver(&acpi_button_driver);
 541
 542         remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
 543
 544         return_VOID;
 545 }
 546
 547
 548 module_init(acpi_button_init);
 549 module_exit(acpi_button_exit);