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