kernel/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  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/types.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/input.h>
  29 #include <linux/slab.h>
  30 #include <linux/acpi.h>
  31 #include <acpi/button.h>
  32
  33 #define PREFIX "ACPI: "
  34
  35 #define ACPI_BUTTON_CLASS               "button"
  36 #define ACPI_BUTTON_FILE_INFO           "info"
  37 #define ACPI_BUTTON_FILE_STATE          "state"
  38 #define ACPI_BUTTON_TYPE_UNKNOWN        0x00
  39 #define ACPI_BUTTON_NOTIFY_STATUS       0x80
  40
  41 #define ACPI_BUTTON_SUBCLASS_POWER      "power"
  42 #define ACPI_BUTTON_HID_POWER           "PNP0C0C"
  43 #define ACPI_BUTTON_DEVICE_NAME_POWER   "Power Button"
  44 #define ACPI_BUTTON_TYPE_POWER          0x01
  45
  46 #define ACPI_BUTTON_SUBCLASS_SLEEP      "sleep"
  47 #define ACPI_BUTTON_HID_SLEEP           "PNP0C0E"
  48 #define ACPI_BUTTON_DEVICE_NAME_SLEEP   "Sleep Button"
  49 #define ACPI_BUTTON_TYPE_SLEEP          0x03
  50
  51 #define ACPI_BUTTON_SUBCLASS_LID        "lid"
  52 #define ACPI_BUTTON_HID_LID             "PNP0C0D"
  53 #define ACPI_BUTTON_DEVICE_NAME_LID     "Lid Switch"
  54 #define ACPI_BUTTON_TYPE_LID            0x05
  55
  56 #define _COMPONENT              ACPI_BUTTON_COMPONENT
  57 ACPI_MODULE_NAME("button");
  58
  59 MODULE_AUTHOR("Paul Diefenbaugh");
  60 MODULE_DESCRIPTION("ACPI Button Driver");
  61 MODULE_LICENSE("GPL");
  62
  63 static const struct acpi_device_id button_device_ids[] = {
  64         {ACPI_BUTTON_HID_LID,    0},
  65         {ACPI_BUTTON_HID_SLEEP,  0},
  66         {ACPI_BUTTON_HID_SLEEPF, 0},
  67         {ACPI_BUTTON_HID_POWER,  0},
  68         {ACPI_BUTTON_HID_POWERF, 0},
  69         {"", 0},
  70 };
  71 MODULE_DEVICE_TABLE(acpi, button_device_ids);
  72
  73 static int acpi_button_add(struct acpi_device *device);
  74 static int acpi_button_remove(struct acpi_device *device);
  75 static void acpi_button_notify(struct acpi_device *device, u32 event);
  76
  77 #ifdef CONFIG_PM_SLEEP
  78 static int acpi_button_suspend(struct device *dev);
  79 static int acpi_button_resume(struct device *dev);
  80 #else
  81 #define acpi_button_suspend NULL
  82 #define acpi_button_resume NULL
  83 #endif
  84 static SIMPLE_DEV_PM_OPS(acpi_button_pm, acpi_button_suspend, acpi_button_resume);
  85
  86 static struct acpi_driver acpi_button_driver = {
  87         .name = "button",
  88         .class = ACPI_BUTTON_CLASS,
  89         .ids = button_device_ids,
  90         .ops = {
  91                 .add = acpi_button_add,
  92                 .remove = acpi_button_remove,
  93                 .notify = acpi_button_notify,
  94         },
  95         .drv.pm = &acpi_button_pm,
  96 };
  97
  98 struct acpi_button {
  99         unsigned int type;
 100         struct input_dev *input;
 101         char phys[32];                  /* for input device */
 102         unsigned long pushed;
 103         bool suspended;
 104 };
 105
 106 static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
 107 static struct acpi_device *lid_device;
 108
 109 /* --------------------------------------------------------------------------
 110                               FS Interface (/proc)
 111    -------------------------------------------------------------------------- */
 112
 113 static struct proc_dir_entry *acpi_button_dir;
 114 static struct proc_dir_entry *acpi_lid_dir;
 115
 116 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
 117 {
 118         struct acpi_device *device = seq->private;
 119         acpi_status status;
 120         unsigned long long state;
 121
 122         status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
 123         seq_printf(seq, "state:      %s\n",
 124                    ACPI_FAILURE(status) ? "unsupported" :
 125                         (state ? "open" : "closed"));
 126         return 0;
 127 }
 128
 129 static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
 130 {
 131         return single_open(file, acpi_button_state_seq_show, PDE_DATA(inode));
 132 }
 133
 134 static const struct file_operations acpi_button_state_fops = {
 135         .owner = THIS_MODULE,
 136         .open = acpi_button_state_open_fs,
 137         .read = seq_read,
 138         .llseek = seq_lseek,
 139         .release = single_release,
 140 };
 141
 142 static int acpi_button_add_fs(struct acpi_device *device)
 143 {
 144         struct acpi_button *button = acpi_driver_data(device);
 145         struct proc_dir_entry *entry = NULL;
 146         int ret = 0;
 147
 148         /* procfs I/F for ACPI lid device only */
 149         if (button->type != ACPI_BUTTON_TYPE_LID)
 150                 return 0;
 151
 152         if (acpi_button_dir || acpi_lid_dir) {
 153                 printk(KERN_ERR PREFIX "More than one Lid device found!\n");
 154                 return -EEXIST;
 155         }
 156
 157         /* create /proc/acpi/button */
 158         acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
 159         if (!acpi_button_dir)
 160                 return -ENODEV;
 161
 162         /* create /proc/acpi/button/lid */
 163         acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
 164         if (!acpi_lid_dir) {
 165                 ret = -ENODEV;
 166                 goto remove_button_dir;
 167         }
 168
 169         /* create /proc/acpi/button/lid/LID/ */
 170         acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir);
 171         if (!acpi_device_dir(device)) {
 172                 ret = -ENODEV;
 173                 goto remove_lid_dir;
 174         }
 175
 176         /* create /proc/acpi/button/lid/LID/state */
 177         entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
 178                                  S_IRUGO, acpi_device_dir(device),
 179                                  &acpi_button_state_fops, device);
 180         if (!entry) {
 181                 ret = -ENODEV;
 182                 goto remove_dev_dir;
 183         }
 184
 185 done:
 186         return ret;
 187
 188 remove_dev_dir:
 189         remove_proc_entry(acpi_device_bid(device),
 190                           acpi_lid_dir);
 191         acpi_device_dir(device) = NULL;
 192 remove_lid_dir:
 193         remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
 194 remove_button_dir:
 195         remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
 196         goto done;
 197 }
 198
 199 static int acpi_button_remove_fs(struct acpi_device *device)
 200 {
 201         struct acpi_button *button = acpi_driver_data(device);
 202
 203         if (button->type != ACPI_BUTTON_TYPE_LID)
 204                 return 0;
 205
 206         remove_proc_entry(ACPI_BUTTON_FILE_STATE,
 207                           acpi_device_dir(device));
 208         remove_proc_entry(acpi_device_bid(device),
 209                           acpi_lid_dir);
 210         acpi_device_dir(device) = NULL;
 211         remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
 212         remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
 213
 214         return 0;
 215 }
 216
 217 /* --------------------------------------------------------------------------
 218                                 Driver Interface
 219    -------------------------------------------------------------------------- */
 220 int acpi_lid_notifier_register(struct notifier_block *nb)
 221 {
 222         return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
 223 }
 224 EXPORT_SYMBOL(acpi_lid_notifier_register);
 225
 226 int acpi_lid_notifier_unregister(struct notifier_block *nb)
 227 {
 228         return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
 229 }
 230 EXPORT_SYMBOL(acpi_lid_notifier_unregister);
 231
 232 int acpi_lid_open(void)
 233 {
 234         acpi_status status;
 235         unsigned long long state;
 236
 237         if (!lid_device)
 238                 return -ENODEV;
 239
 240         status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
 241                                        &state);
 242         if (ACPI_FAILURE(status))
 243                 return -ENODEV;
 244
 245         return !!state;
 246 }
 247 EXPORT_SYMBOL(acpi_lid_open);
 248
 249 static int acpi_lid_send_state(struct acpi_device *device)
 250 {
 251         struct acpi_button *button = acpi_driver_data(device);
 252         unsigned long long state;
 253         acpi_status status;
 254         int ret;
 255
 256         status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
 257         if (ACPI_FAILURE(status))
 258                 return -ENODEV;
 259
 260         /* input layer checks if event is redundant */
 261         input_report_switch(button->input, SW_LID, !state);
 262         input_sync(button->input);
 263
 264         if (state)
 265                 pm_wakeup_event(&device->dev, 0);
 266
 267         ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
 268         if (ret == NOTIFY_DONE)
 269                 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
 270                                                    device);
 271         if (ret == NOTIFY_DONE || ret == NOTIFY_OK) {
 272                 /*
 273                  * It is also regarded as success if the notifier_chain
 274                  * returns NOTIFY_OK or NOTIFY_DONE.
 275                  */
 276                 ret = 0;
 277         }
 278         return ret;
 279 }
 280
 281 static void acpi_button_notify(struct acpi_device *device, u32 event)
 282 {
 283         struct acpi_button *button = acpi_driver_data(device);
 284         struct input_dev *input;
 285
 286         switch (event) {
 287         case ACPI_FIXED_HARDWARE_EVENT:
 288                 event = ACPI_BUTTON_NOTIFY_STATUS;
 289                 /* fall through */
 290         case ACPI_BUTTON_NOTIFY_STATUS:
 291                 input = button->input;
 292                 if (button->type == ACPI_BUTTON_TYPE_LID) {
 293                         acpi_lid_send_state(device);
 294                 } else {
 295                         int keycode;
 296
 297                         pm_wakeup_event(&device->dev, 0);
 298                         if (button->suspended)
 299                                 break;
 300
 301                         keycode = test_bit(KEY_SLEEP, input->keybit) ?
 302                                                 KEY_SLEEP : KEY_POWER;
 303                         input_report_key(input, keycode, 1);
 304                         input_sync(input);
 305                         input_report_key(input, keycode, 0);
 306                         input_sync(input);
 307
 308                         acpi_bus_generate_netlink_event(
 309                                         device->pnp.device_class,
 310                                         dev_name(&device->dev),
 311                                         event, ++button->pushed);
 312                 }
 313                 break;
 314         default:
 315                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 316                                   "Unsupported event [0x%x]\n", event));
 317                 break;
 318         }
 319 }
 320
 321 #ifdef CONFIG_PM_SLEEP
 322 static int acpi_button_suspend(struct device *dev)
 323 {
 324         struct acpi_device *device = to_acpi_device(dev);
 325         struct acpi_button *button = acpi_driver_data(device);
 326
 327         button->suspended = true;
 328         return 0;
 329 }
 330
 331 static int acpi_button_resume(struct device *dev)
 332 {
 333         struct acpi_device *device = to_acpi_device(dev);
 334         struct acpi_button *button = acpi_driver_data(device);
 335
 336         button->suspended = false;
 337         if (button->type == ACPI_BUTTON_TYPE_LID)
 338                 return acpi_lid_send_state(device);
 339         return 0;
 340 }
 341 #endif
 342
 343 static int acpi_button_add(struct acpi_device *device)
 344 {
 345         struct acpi_button *button;
 346         struct input_dev *input;
 347         const char *hid = acpi_device_hid(device);
 348         char *name, *class;
 349         int error;
 350
 351         button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
 352         if (!button)
 353                 return -ENOMEM;
 354
 355         device->driver_data = button;
 356
 357         button->input = input = input_allocate_device();
 358         if (!input) {
 359                 error = -ENOMEM;
 360                 goto err_free_button;
 361         }
 362
 363         name = acpi_device_name(device);
 364         class = acpi_device_class(device);
 365
 366         if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
 367             !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
 368                 button->type = ACPI_BUTTON_TYPE_POWER;
 369                 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
 370                 sprintf(class, "%s/%s",
 371                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
 372         } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
 373                    !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
 374                 button->type = ACPI_BUTTON_TYPE_SLEEP;
 375                 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
 376                 sprintf(class, "%s/%s",
 377                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
 378         } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
 379                 button->type = ACPI_BUTTON_TYPE_LID;
 380                 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
 381                 sprintf(class, "%s/%s",
 382                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
 383         } else {
 384                 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
 385                 error = -ENODEV;
 386                 goto err_free_input;
 387         }
 388
 389         error = acpi_button_add_fs(device);
 390         if (error)
 391                 goto err_free_input;
 392
 393         snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
 394
 395         input->name = name;
 396         input->phys = button->phys;
 397         input->id.bustype = BUS_HOST;
 398         input->id.product = button->type;
 399         input->dev.parent = &device->dev;
 400
 401         switch (button->type) {
 402         case ACPI_BUTTON_TYPE_POWER:
 403                 input_set_capability(input, EV_KEY, KEY_POWER);
 404                 break;
 405
 406         case ACPI_BUTTON_TYPE_SLEEP:
 407                 input_set_capability(input, EV_KEY, KEY_SLEEP);
 408                 break;
 409
 410         case ACPI_BUTTON_TYPE_LID:
 411                 input_set_capability(input, EV_SW, SW_LID);
 412                 break;
 413         }
 414
 415         error = input_register_device(input);
 416         if (error)
 417                 goto err_remove_fs;
 418         if (button->type == ACPI_BUTTON_TYPE_LID) {
 419                 acpi_lid_send_state(device);
 420                 /*
 421                  * This assumes there's only one lid device, or if there are
 422                  * more we only care about the last one...
 423                  */
 424                 lid_device = device;
 425         }
 426
 427         printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
 428         return 0;
 429
 430  err_remove_fs:
 431         acpi_button_remove_fs(device);
 432  err_free_input:
 433         input_free_device(input);
 434  err_free_button:
 435         kfree(button);
 436         return error;
 437 }
 438
 439 static int acpi_button_remove(struct acpi_device *device)
 440 {
 441         struct acpi_button *button = acpi_driver_data(device);
 442
 443         acpi_button_remove_fs(device);
 444         input_unregister_device(button->input);
 445         kfree(button);
 446         return 0;
 447 }
 448
 449 module_acpi_driver(acpi_button_driver);