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