linux/drivers/acpi/button.c
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   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
  61ACPI_MODULE_NAME("button");
  62
  63MODULE_AUTHOR("Paul Diefenbaugh");
  64MODULE_DESCRIPTION("ACPI Button Driver");
  65MODULE_LICENSE("GPL");
  66
  67static 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};
  75MODULE_DEVICE_TABLE(acpi, button_device_ids);
  76
  77static int acpi_button_add(struct acpi_device *device);
  78static int acpi_button_remove(struct acpi_device *device, int type);
  79static void acpi_button_notify(struct acpi_device *device, u32 event);
  80
  81#ifdef CONFIG_PM_SLEEP
  82static int acpi_button_resume(struct device *dev);
  83#endif
  84static SIMPLE_DEV_PM_OPS(acpi_button_pm, NULL, acpi_button_resume);
  85
  86static 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
  98struct acpi_button {
  99        unsigned int type;
 100        struct input_dev *input;
 101        char phys[32];                  /* for input device */
 102        unsigned long pushed;
 103        bool wakeup_enabled;
 104};
 105
 106static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
 107static struct acpi_device *lid_device;
 108
 109/* --------------------------------------------------------------------------
 110                              FS Interface (/proc)
 111   -------------------------------------------------------------------------- */
 112
 113static struct proc_dir_entry *acpi_button_dir;
 114static struct proc_dir_entry *acpi_lid_dir;
 115
 116static 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
 129static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
 130{
 131        return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
 132}
 133
 134static 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
 142static 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
 185done:
 186        return ret;
 187
 188remove_dev_dir:
 189        remove_proc_entry(acpi_device_bid(device),
 190                          acpi_lid_dir);
 191        acpi_device_dir(device) = NULL;
 192remove_lid_dir:
 193        remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
 194remove_button_dir:
 195        remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
 196        goto done;
 197}
 198
 199static 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   -------------------------------------------------------------------------- */
 220int acpi_lid_notifier_register(struct notifier_block *nb)
 221{
 222        return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
 223}
 224EXPORT_SYMBOL(acpi_lid_notifier_register);
 225
 226int acpi_lid_notifier_unregister(struct notifier_block *nb)
 227{
 228        return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
 229}
 230EXPORT_SYMBOL(acpi_lid_notifier_unregister);
 231
 232int 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}
 247EXPORT_SYMBOL(acpi_lid_open);
 248
 249static 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
 281static 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 = test_bit(KEY_SLEEP, input->keybit) ?
 296                                                KEY_SLEEP : KEY_POWER;
 297
 298                        input_report_key(input, keycode, 1);
 299                        input_sync(input);
 300                        input_report_key(input, keycode, 0);
 301                        input_sync(input);
 302
 303                        pm_wakeup_event(&device->dev, 0);
 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#ifdef CONFIG_PM_SLEEP
 316static int acpi_button_resume(struct device *dev)
 317{
 318        struct acpi_device *device = to_acpi_device(dev);
 319        struct acpi_button *button = acpi_driver_data(device);
 320
 321        if (button->type == ACPI_BUTTON_TYPE_LID)
 322                return acpi_lid_send_state(device);
 323        return 0;
 324}
 325#endif
 326
 327static int acpi_button_add(struct acpi_device *device)
 328{
 329        struct acpi_button *button;
 330        struct input_dev *input;
 331        const char *hid = acpi_device_hid(device);
 332        char *name, *class;
 333        int error;
 334
 335        button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
 336        if (!button)
 337                return -ENOMEM;
 338
 339        device->driver_data = button;
 340
 341        button->input = input = input_allocate_device();
 342        if (!input) {
 343                error = -ENOMEM;
 344                goto err_free_button;
 345        }
 346
 347        name = acpi_device_name(device);
 348        class = acpi_device_class(device);
 349
 350        if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
 351            !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
 352                button->type = ACPI_BUTTON_TYPE_POWER;
 353                strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
 354                sprintf(class, "%s/%s",
 355                        ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
 356        } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
 357                   !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
 358                button->type = ACPI_BUTTON_TYPE_SLEEP;
 359                strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
 360                sprintf(class, "%s/%s",
 361                        ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
 362        } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
 363                button->type = ACPI_BUTTON_TYPE_LID;
 364                strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
 365                sprintf(class, "%s/%s",
 366                        ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
 367        } else {
 368                printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
 369                error = -ENODEV;
 370                goto err_free_input;
 371        }
 372
 373        error = acpi_button_add_fs(device);
 374        if (error)
 375                goto err_free_input;
 376
 377        snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
 378
 379        input->name = name;
 380        input->phys = button->phys;
 381        input->id.bustype = BUS_HOST;
 382        input->id.product = button->type;
 383        input->dev.parent = &device->dev;
 384
 385        switch (button->type) {
 386        case ACPI_BUTTON_TYPE_POWER:
 387                input->evbit[0] = BIT_MASK(EV_KEY);
 388                set_bit(KEY_POWER, input->keybit);
 389                break;
 390
 391        case ACPI_BUTTON_TYPE_SLEEP:
 392                input->evbit[0] = BIT_MASK(EV_KEY);
 393                set_bit(KEY_SLEEP, input->keybit);
 394                break;
 395
 396        case ACPI_BUTTON_TYPE_LID:
 397                input->evbit[0] = BIT_MASK(EV_SW);
 398                set_bit(SW_LID, input->swbit);
 399                break;
 400        }
 401
 402        error = input_register_device(input);
 403        if (error)
 404                goto err_remove_fs;
 405        if (button->type == ACPI_BUTTON_TYPE_LID) {
 406                acpi_lid_send_state(device);
 407                /*
 408                 * This assumes there's only one lid device, or if there are
 409                 * more we only care about the last one...
 410                 */
 411                lid_device = device;
 412        }
 413
 414        if (device->wakeup.flags.valid) {
 415                /* Button's GPE is run-wake GPE */
 416                acpi_enable_gpe(device->wakeup.gpe_device,
 417                                device->wakeup.gpe_number);
 418                if (!device_may_wakeup(&device->dev)) {
 419                        device_set_wakeup_enable(&device->dev, true);
 420                        button->wakeup_enabled = true;
 421                }
 422        }
 423
 424        printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
 425        return 0;
 426
 427 err_remove_fs:
 428        acpi_button_remove_fs(device);
 429 err_free_input:
 430        input_free_device(input);
 431 err_free_button:
 432        kfree(button);
 433        return error;
 434}
 435
 436static int acpi_button_remove(struct acpi_device *device, int type)
 437{
 438        struct acpi_button *button = acpi_driver_data(device);
 439
 440        if (device->wakeup.flags.valid) {
 441                acpi_disable_gpe(device->wakeup.gpe_device,
 442                                device->wakeup.gpe_number);
 443                if (button->wakeup_enabled)
 444                        device_set_wakeup_enable(&device->dev, false);
 445        }
 446
 447        acpi_button_remove_fs(device);
 448        input_unregister_device(button->input);
 449        kfree(button);
 450        return 0;
 451}
 452
 453static int __init acpi_button_init(void)
 454{
 455        return acpi_bus_register_driver(&acpi_button_driver);
 456}
 457
 458static void __exit acpi_button_exit(void)
 459{
 460        acpi_bus_unregister_driver(&acpi_button_driver);
 461}
 462
 463module_init(acpi_button_init);
 464module_exit(acpi_button_exit);
 465
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