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