release/src-rt-6.x.4708/linux/linux-2.6.36/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 <linux/slab.h>
  34 #include <acpi/acpi_bus.h>
  35 #include <acpi/acpi_drivers.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, int type);
  79 static int acpi_button_resume(struct acpi_device *device);
  80 static void acpi_button_notify(struct acpi_device *device, u32 event);
  81 static int acpi_button_info_open_fs(struct inode *inode, struct file *file);
  82 static int acpi_button_state_open_fs(struct inode *inode, struct file *file);
  83
  84 static struct acpi_driver acpi_button_driver = {
  85         .name = "button",
  86         .class = ACPI_BUTTON_CLASS,
  87         .ids = button_device_ids,
  88         .ops = {
  89                 .add = acpi_button_add,
  90                 .resume = acpi_button_resume,
  91                 .remove = acpi_button_remove,
  92                 .notify = acpi_button_notify,
  93         },
  94 };
  95
  96 struct acpi_button {
  97         unsigned int type;
  98         struct input_dev *input;
  99         char phys[32];                  /* for input device */
 100         unsigned long pushed;
 101 };
 102
 103 static const struct file_operations acpi_button_info_fops = {
 104         .owner = THIS_MODULE,
 105         .open = acpi_button_info_open_fs,
 106         .read = seq_read,
 107         .llseek = seq_lseek,
 108         .release = single_release,
 109 };
 110
 111 static const struct file_operations acpi_button_state_fops = {
 112         .owner = THIS_MODULE,
 113         .open = acpi_button_state_open_fs,
 114         .read = seq_read,
 115         .llseek = seq_lseek,
 116         .release = single_release,
 117 };
 118
 119 static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
 120 static struct acpi_device *lid_device;
 121
 122 /* --------------------------------------------------------------------------
 123                               FS Interface (/proc)
 124    -------------------------------------------------------------------------- */
 125
 126 static struct proc_dir_entry *acpi_button_dir;
 127
 128 static int acpi_button_info_seq_show(struct seq_file *seq, void *offset)
 129 {
 130         struct acpi_device *device = seq->private;
 131
 132         seq_printf(seq, "type:                    %s\n",
 133                    acpi_device_name(device));
 134         return 0;
 135 }
 136
 137 static int acpi_button_info_open_fs(struct inode *inode, struct file *file)
 138 {
 139         return single_open(file, acpi_button_info_seq_show, PDE(inode)->data);
 140 }
 141
 142 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
 143 {
 144         struct acpi_device *device = seq->private;
 145         acpi_status status;
 146         unsigned long long state;
 147
 148         status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
 149         seq_printf(seq, "state:      %s\n",
 150                    ACPI_FAILURE(status) ? "unsupported" :
 151                         (state ? "open" : "closed"));
 152         return 0;
 153 }
 154
 155 static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
 156 {
 157         return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
 158 }
 159
 160 static struct proc_dir_entry *acpi_power_dir;
 161 static struct proc_dir_entry *acpi_sleep_dir;
 162 static struct proc_dir_entry *acpi_lid_dir;
 163
 164 static int acpi_button_add_fs(struct acpi_device *device)
 165 {
 166         struct acpi_button *button = acpi_driver_data(device);
 167         struct proc_dir_entry *entry = NULL;
 168
 169         switch (button->type) {
 170         case ACPI_BUTTON_TYPE_POWER:
 171                 if (!acpi_power_dir)
 172                         acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER,
 173                                                     acpi_button_dir);
 174                 entry = acpi_power_dir;
 175                 break;
 176         case ACPI_BUTTON_TYPE_SLEEP:
 177                 if (!acpi_sleep_dir)
 178                         acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP,
 179                                                     acpi_button_dir);
 180                 entry = acpi_sleep_dir;
 181                 break;
 182         case ACPI_BUTTON_TYPE_LID:
 183                 if (!acpi_lid_dir)
 184                         acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID,
 185                                                   acpi_button_dir);
 186                 entry = acpi_lid_dir;
 187                 break;
 188         }
 189
 190         if (!entry)
 191                 return -ENODEV;
 192
 193         acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
 194         if (!acpi_device_dir(device))
 195                 return -ENODEV;
 196
 197         /* 'info' [R] */
 198         entry = proc_create_data(ACPI_BUTTON_FILE_INFO,
 199                                  S_IRUGO, acpi_device_dir(device),
 200                                  &acpi_button_info_fops, device);
 201         if (!entry)
 202                 return -ENODEV;
 203
 204         /* show lid state [R] */
 205         if (button->type == ACPI_BUTTON_TYPE_LID) {
 206                 entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
 207                                          S_IRUGO, acpi_device_dir(device),
 208                                          &acpi_button_state_fops, device);
 209                 if (!entry)
 210                         return -ENODEV;
 211         }
 212
 213         return 0;
 214 }
 215
 216 static int acpi_button_remove_fs(struct acpi_device *device)
 217 {
 218         struct acpi_button *button = acpi_driver_data(device);
 219
 220         if (acpi_device_dir(device)) {
 221                 if (button->type == ACPI_BUTTON_TYPE_LID)
 222                         remove_proc_entry(ACPI_BUTTON_FILE_STATE,
 223                                           acpi_device_dir(device));
 224                 remove_proc_entry(ACPI_BUTTON_FILE_INFO,
 225                                   acpi_device_dir(device));
 226
 227                 remove_proc_entry(acpi_device_bid(device),
 228                                   acpi_device_dir(device)->parent);
 229                 acpi_device_dir(device) = NULL;
 230         }
 231
 232         return 0;
 233 }
 234
 235 /* --------------------------------------------------------------------------
 236                                 Driver Interface
 237    -------------------------------------------------------------------------- */
 238 int acpi_lid_notifier_register(struct notifier_block *nb)
 239 {
 240         return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
 241 }
 242 EXPORT_SYMBOL(acpi_lid_notifier_register);
 243
 244 int acpi_lid_notifier_unregister(struct notifier_block *nb)
 245 {
 246         return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
 247 }
 248 EXPORT_SYMBOL(acpi_lid_notifier_unregister);
 249
 250 int acpi_lid_open(void)
 251 {
 252         acpi_status status;
 253         unsigned long long state;
 254
 255         if (!lid_device)
 256                 return -ENODEV;
 257
 258         status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
 259                                        &state);
 260         if (ACPI_FAILURE(status))
 261                 return -ENODEV;
 262
 263         return !!state;
 264 }
 265 EXPORT_SYMBOL(acpi_lid_open);
 266
 267 static int acpi_lid_send_state(struct acpi_device *device)
 268 {
 269         struct acpi_button *button = acpi_driver_data(device);
 270         unsigned long long state;
 271         acpi_status status;
 272         int ret;
 273
 274         status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
 275         if (ACPI_FAILURE(status))
 276                 return -ENODEV;
 277
 278         /* input layer checks if event is redundant */
 279         input_report_switch(button->input, SW_LID, !state);
 280         input_sync(button->input);
 281
 282         ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
 283         if (ret == NOTIFY_DONE)
 284                 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
 285                                                    device);
 286         if (ret == NOTIFY_DONE || ret == NOTIFY_OK) {
 287                 /*
 288                  * It is also regarded as success if the notifier_chain
 289                  * returns NOTIFY_OK or NOTIFY_DONE.
 290                  */
 291                 ret = 0;
 292         }
 293         return ret;
 294 }
 295
 296 static void acpi_button_notify(struct acpi_device *device, u32 event)
 297 {
 298         struct acpi_button *button = acpi_driver_data(device);
 299         struct input_dev *input;
 300
 301         switch (event) {
 302         case ACPI_FIXED_HARDWARE_EVENT:
 303                 event = ACPI_BUTTON_NOTIFY_STATUS;
 304                 /* fall through */
 305         case ACPI_BUTTON_NOTIFY_STATUS:
 306                 input = button->input;
 307                 if (button->type == ACPI_BUTTON_TYPE_LID) {
 308                         acpi_lid_send_state(device);
 309                 } else {
 310                         int keycode = test_bit(KEY_SLEEP, input->keybit) ?
 311                                                 KEY_SLEEP : KEY_POWER;
 312
 313                         input_report_key(input, keycode, 1);
 314                         input_sync(input);
 315                         input_report_key(input, keycode, 0);
 316                         input_sync(input);
 317                 }
 318
 319                 acpi_bus_generate_proc_event(device, event, ++button->pushed);
 320                 break;
 321         default:
 322                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 323                                   "Unsupported event [0x%x]\n", event));
 324                 break;
 325         }
 326 }
 327
 328 static int acpi_button_resume(struct acpi_device *device)
 329 {
 330         struct acpi_button *button = acpi_driver_data(device);
 331
 332         if (button->type == ACPI_BUTTON_TYPE_LID)
 333                 return acpi_lid_send_state(device);
 334         return 0;
 335 }
 336
 337 static int acpi_button_add(struct acpi_device *device)
 338 {
 339         struct acpi_button *button;
 340         struct input_dev *input;
 341         char *hid, *name, *class;
 342         int error;
 343
 344         button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
 345         if (!button)
 346                 return -ENOMEM;
 347
 348         device->driver_data = button;
 349
 350         button->input = input = input_allocate_device();
 351         if (!input) {
 352                 error = -ENOMEM;
 353                 goto err_free_button;
 354         }
 355
 356         hid = acpi_device_hid(device);
 357         name = acpi_device_name(device);
 358         class = acpi_device_class(device);
 359
 360         if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
 361             !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
 362                 button->type = ACPI_BUTTON_TYPE_POWER;
 363                 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
 364                 sprintf(class, "%s/%s",
 365                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
 366         } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
 367                    !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
 368                 button->type = ACPI_BUTTON_TYPE_SLEEP;
 369                 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
 370                 sprintf(class, "%s/%s",
 371                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
 372         } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
 373                 button->type = ACPI_BUTTON_TYPE_LID;
 374                 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
 375                 sprintf(class, "%s/%s",
 376                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
 377         } else {
 378                 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
 379                 error = -ENODEV;
 380                 goto err_free_input;
 381         }
 382
 383         error = acpi_button_add_fs(device);
 384         if (error)
 385                 goto err_free_input;
 386
 387         snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
 388
 389         input->name = name;
 390         input->phys = button->phys;
 391         input->id.bustype = BUS_HOST;
 392         input->id.product = button->type;
 393         input->dev.parent = &device->dev;
 394
 395         switch (button->type) {
 396         case ACPI_BUTTON_TYPE_POWER:
 397                 input->evbit[0] = BIT_MASK(EV_KEY);
 398                 set_bit(KEY_POWER, input->keybit);
 399                 break;
 400
 401         case ACPI_BUTTON_TYPE_SLEEP:
 402                 input->evbit[0] = BIT_MASK(EV_KEY);
 403                 set_bit(KEY_SLEEP, input->keybit);
 404                 break;
 405
 406         case ACPI_BUTTON_TYPE_LID:
 407                 input->evbit[0] = BIT_MASK(EV_SW);
 408                 set_bit(SW_LID, input->swbit);
 409                 break;
 410         }
 411
 412         error = input_register_device(input);
 413         if (error)
 414                 goto err_remove_fs;
 415         if (button->type == ACPI_BUTTON_TYPE_LID) {
 416                 acpi_lid_send_state(device);
 417                 /*
 418                  * This assumes there's only one lid device, or if there are
 419                  * more we only care about the last one...
 420                  */
 421                 lid_device = device;
 422         }
 423
 424         if (device->wakeup.flags.valid) {
 425                 /* Button's GPE is run-wake GPE */
 426                 acpi_enable_gpe(device->wakeup.gpe_device,
 427                                 device->wakeup.gpe_number);
 428                 device->wakeup.run_wake_count++;
 429                 device->wakeup.state.enabled = 1;
 430         }
 431
 432         printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
 433         return 0;
 434
 435  err_remove_fs:
 436         acpi_button_remove_fs(device);
 437  err_free_input:
 438         input_free_device(input);
 439  err_free_button:
 440         kfree(button);
 441         return error;
 442 }
 443
 444 static int acpi_button_remove(struct acpi_device *device, int type)
 445 {
 446         struct acpi_button *button = acpi_driver_data(device);
 447
 448         if (device->wakeup.flags.valid) {
 449                 acpi_disable_gpe(device->wakeup.gpe_device,
 450                                 device->wakeup.gpe_number);
 451                 device->wakeup.run_wake_count--;
 452                 device->wakeup.state.enabled = 0;
 453         }
 454
 455         acpi_button_remove_fs(device);
 456         input_unregister_device(button->input);
 457         kfree(button);
 458         return 0;
 459 }
 460
 461 static int __init acpi_button_init(void)
 462 {
 463         int result;
 464
 465         acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
 466         if (!acpi_button_dir)
 467                 return -ENODEV;
 468
 469         result = acpi_bus_register_driver(&acpi_button_driver);
 470         if (result < 0) {
 471                 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
 472                 return -ENODEV;
 473         }
 474
 475         return 0;
 476 }
 477
 478 static void __exit acpi_button_exit(void)
 479 {
 480         acpi_bus_unregister_driver(&acpi_button_driver);
 481
 482         if (acpi_power_dir)
 483                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir);
 484         if (acpi_sleep_dir)
 485                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir);
 486         if (acpi_lid_dir)
 487                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
 488         remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
 489 }
 490
 491 module_init(acpi_button_init);
 492 module_exit(acpi_button_exit);