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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 <acpi/acpi_bus.h>
  34 #include <acpi/acpi_drivers.h>
  35
  36 #define ACPI_BUTTON_CLASS               "button"
  37 #define ACPI_BUTTON_FILE_INFO           "info"
  38 #define ACPI_BUTTON_FILE_STATE          "state"
  39 #define ACPI_BUTTON_TYPE_UNKNOWN        0x00
  40 #define ACPI_BUTTON_NOTIFY_STATUS       0x80
  41
  42 #define ACPI_BUTTON_SUBCLASS_POWER      "power"
  43 #define ACPI_BUTTON_HID_POWER           "PNP0C0C"
  44 #define ACPI_BUTTON_DEVICE_NAME_POWER   "Power Button (CM)"
  45 #define ACPI_BUTTON_DEVICE_NAME_POWERF  "Power Button (FF)"
  46 #define ACPI_BUTTON_TYPE_POWER          0x01
  47 #define ACPI_BUTTON_TYPE_POWERF         0x02
  48
  49 #define ACPI_BUTTON_SUBCLASS_SLEEP      "sleep"
  50 #define ACPI_BUTTON_HID_SLEEP           "PNP0C0E"
  51 #define ACPI_BUTTON_DEVICE_NAME_SLEEP   "Sleep Button (CM)"
  52 #define ACPI_BUTTON_DEVICE_NAME_SLEEPF  "Sleep Button (FF)"
  53 #define ACPI_BUTTON_TYPE_SLEEP          0x03
  54 #define ACPI_BUTTON_TYPE_SLEEPF         0x04
  55
  56 #define ACPI_BUTTON_SUBCLASS_LID        "lid"
  57 #define ACPI_BUTTON_HID_LID             "PNP0C0D"
  58 #define ACPI_BUTTON_DEVICE_NAME_LID     "Lid Switch"
  59 #define ACPI_BUTTON_TYPE_LID            0x05
  60
  61 #define _COMPONENT              ACPI_BUTTON_COMPONENT
  62 ACPI_MODULE_NAME("button");
  63
  64 MODULE_AUTHOR("Paul Diefenbaugh");
  65 MODULE_DESCRIPTION("ACPI Button Driver");
  66 MODULE_LICENSE("GPL");
  67
  68 static const struct acpi_device_id button_device_ids[] = {
  69         {ACPI_BUTTON_HID_LID,    0},
  70         {ACPI_BUTTON_HID_SLEEP,  0},
  71         {ACPI_BUTTON_HID_SLEEPF, 0},
  72         {ACPI_BUTTON_HID_POWER,  0},
  73         {ACPI_BUTTON_HID_POWERF, 0},
  74         {"", 0},
  75 };
  76 MODULE_DEVICE_TABLE(acpi, button_device_ids);
  77
  78 static int acpi_button_add(struct acpi_device *device);
  79 static int acpi_button_remove(struct acpi_device *device, int type);
  80 static int acpi_button_resume(struct acpi_device *device);
  81 static void acpi_button_notify(struct acpi_device *device, u32 event);
  82 static int acpi_button_info_open_fs(struct inode *inode, struct file *file);
  83 static int acpi_button_state_open_fs(struct inode *inode, struct file *file);
  84
  85 static struct acpi_driver acpi_button_driver = {
  86         .name = "button",
  87         .class = ACPI_BUTTON_CLASS,
  88         .ids = button_device_ids,
  89         .ops = {
  90                 .add = acpi_button_add,
  91                 .resume = acpi_button_resume,
  92                 .remove = acpi_button_remove,
  93                 .notify = acpi_button_notify,
  94         },
  95 };
  96
  97 struct acpi_button {
  98         struct acpi_device *device;     /* Fixed button kludge */
  99         unsigned int type;
 100         struct input_dev *input;
 101         char phys[32];                  /* for input device */
 102         unsigned long pushed;
 103 };
 104
 105 static const struct file_operations acpi_button_info_fops = {
 106         .owner = THIS_MODULE,
 107         .open = acpi_button_info_open_fs,
 108         .read = seq_read,
 109         .llseek = seq_lseek,
 110         .release = single_release,
 111 };
 112
 113 static const struct file_operations acpi_button_state_fops = {
 114         .owner = THIS_MODULE,
 115         .open = acpi_button_state_open_fs,
 116         .read = seq_read,
 117         .llseek = seq_lseek,
 118         .release = single_release,
 119 };
 120
 121 /* --------------------------------------------------------------------------
 122                               FS Interface (/proc)
 123    -------------------------------------------------------------------------- */
 124
 125 static struct proc_dir_entry *acpi_button_dir;
 126
 127 static int acpi_button_info_seq_show(struct seq_file *seq, void *offset)
 128 {
 129         struct acpi_button *button = seq->private;
 130
 131         if (!button || !button->device)
 132                 return 0;
 133
 134         seq_printf(seq, "type:                    %s\n",
 135                    acpi_device_name(button->device));
 136         return 0;
 137 }
 138
 139 static int acpi_button_info_open_fs(struct inode *inode, struct file *file)
 140 {
 141         return single_open(file, acpi_button_info_seq_show, PDE(inode)->data);
 142 }
 143
 144 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
 145 {
 146         struct acpi_button *button = seq->private;
 147         acpi_status status;
 148         unsigned long long state;
 149
 150         if (!button || !button->device)
 151                 return 0;
 152
 153         status = acpi_evaluate_integer(button->device->handle, "_LID", NULL, &state);
 154         seq_printf(seq, "state:      %s\n",
 155                    ACPI_FAILURE(status) ? "unsupported" :
 156                         (state ? "open" : "closed"));
 157         return 0;
 158 }
 159
 160 static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
 161 {
 162         return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
 163 }
 164
 165 static struct proc_dir_entry *acpi_power_dir;
 166 static struct proc_dir_entry *acpi_sleep_dir;
 167 static struct proc_dir_entry *acpi_lid_dir;
 168
 169 static int acpi_button_add_fs(struct acpi_device *device)
 170 {
 171         struct proc_dir_entry *entry = NULL;
 172         struct acpi_button *button;
 173
 174         if (!device || !acpi_driver_data(device))
 175                 return -EINVAL;
 176
 177         button = acpi_driver_data(device);
 178
 179         switch (button->type) {
 180         case ACPI_BUTTON_TYPE_POWER:
 181         case ACPI_BUTTON_TYPE_POWERF:
 182                 if (!acpi_power_dir)
 183                         acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER,
 184                                                     acpi_button_dir);
 185                 entry = acpi_power_dir;
 186                 break;
 187         case ACPI_BUTTON_TYPE_SLEEP:
 188         case ACPI_BUTTON_TYPE_SLEEPF:
 189                 if (!acpi_sleep_dir)
 190                         acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP,
 191                                                     acpi_button_dir);
 192                 entry = acpi_sleep_dir;
 193                 break;
 194         case ACPI_BUTTON_TYPE_LID:
 195                 if (!acpi_lid_dir)
 196                         acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID,
 197                                                   acpi_button_dir);
 198                 entry = acpi_lid_dir;
 199                 break;
 200         }
 201
 202         if (!entry)
 203                 return -ENODEV;
 204
 205         acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
 206         if (!acpi_device_dir(device))
 207                 return -ENODEV;
 208
 209         /* 'info' [R] */
 210         entry = proc_create_data(ACPI_BUTTON_FILE_INFO,
 211                                  S_IRUGO, acpi_device_dir(device),
 212                                  &acpi_button_info_fops,
 213                                  acpi_driver_data(device));
 214         if (!entry)
 215                 return -ENODEV;
 216
 217         /* show lid state [R] */
 218         if (button->type == ACPI_BUTTON_TYPE_LID) {
 219                 entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
 220                                          S_IRUGO, acpi_device_dir(device),
 221                                          &acpi_button_state_fops,
 222                                          acpi_driver_data(device));
 223                 if (!entry)
 224                         return -ENODEV;
 225         }
 226
 227         return 0;
 228 }
 229
 230 static int acpi_button_remove_fs(struct acpi_device *device)
 231 {
 232         struct acpi_button *button = acpi_driver_data(device);
 233
 234         if (acpi_device_dir(device)) {
 235                 if (button->type == ACPI_BUTTON_TYPE_LID)
 236                         remove_proc_entry(ACPI_BUTTON_FILE_STATE,
 237                                           acpi_device_dir(device));
 238                 remove_proc_entry(ACPI_BUTTON_FILE_INFO,
 239                                   acpi_device_dir(device));
 240
 241                 remove_proc_entry(acpi_device_bid(device),
 242                                   acpi_device_dir(device)->parent);
 243                 acpi_device_dir(device) = NULL;
 244         }
 245
 246         return 0;
 247 }
 248
 249 /* --------------------------------------------------------------------------
 250                                 Driver Interface
 251    -------------------------------------------------------------------------- */
 252 static int acpi_lid_send_state(struct acpi_button *button)
 253 {
 254         unsigned long long state;
 255         acpi_status status;
 256
 257         status = acpi_evaluate_integer(button->device->handle, "_LID", NULL,
 258                                         &state);
 259         if (ACPI_FAILURE(status))
 260                 return -ENODEV;
 261
 262         /* input layer checks if event is redundant */
 263         input_report_switch(button->input, SW_LID, !state);
 264         input_sync(button->input);
 265         return 0;
 266 }
 267
 268 static void acpi_button_notify(struct acpi_device *device, u32 event)
 269 {
 270         struct acpi_button *button = acpi_driver_data(device);
 271         struct input_dev *input;
 272
 273         if (!button || !button->device)
 274                 return;
 275
 276         switch (event) {
 277         case ACPI_FIXED_HARDWARE_EVENT:
 278                 event = ACPI_BUTTON_NOTIFY_STATUS;
 279                 /* fall through */
 280         case ACPI_BUTTON_NOTIFY_STATUS:
 281                 input = button->input;
 282                 if (button->type == ACPI_BUTTON_TYPE_LID) {
 283                         acpi_lid_send_state(button);
 284                 } else {
 285                         int keycode = test_bit(KEY_SLEEP, input->keybit) ?
 286                                                 KEY_SLEEP : KEY_POWER;
 287
 288                         input_report_key(input, keycode, 1);
 289                         input_sync(input);
 290                         input_report_key(input, keycode, 0);
 291                         input_sync(input);
 292                 }
 293
 294                 acpi_bus_generate_proc_event(button->device, event,
 295                                         ++button->pushed);
 296                 break;
 297         default:
 298                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 299                                   "Unsupported event [0x%x]\n", event));
 300                 break;
 301         }
 302 }
 303
 304 static int acpi_button_resume(struct acpi_device *device)
 305 {
 306         struct acpi_button *button;
 307
 308         if (!device)
 309                 return -EINVAL;
 310         button = acpi_driver_data(device);
 311         if (button && button->type == ACPI_BUTTON_TYPE_LID)
 312                 return acpi_lid_send_state(button);
 313         return 0;
 314 }
 315
 316 static int acpi_button_add(struct acpi_device *device)
 317 {
 318         int error;
 319         struct acpi_button *button;
 320         struct input_dev *input;
 321
 322         if (!device)
 323                 return -EINVAL;
 324
 325         button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
 326         if (!button)
 327                 return -ENOMEM;
 328
 329         button->device = device;
 330         device->driver_data = button;
 331
 332         button->input = input = input_allocate_device();
 333         if (!input) {
 334                 error = -ENOMEM;
 335                 goto err_free_button;
 336         }
 337
 338         /*
 339          * Determine the button type (via hid), as fixed-feature buttons
 340          * need to be handled a bit differently than generic-space.
 341          */
 342         if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWER)) {
 343                 button->type = ACPI_BUTTON_TYPE_POWER;
 344                 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_POWER);
 345                 sprintf(acpi_device_class(device), "%s/%s",
 346                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
 347         } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF)) {
 348                 button->type = ACPI_BUTTON_TYPE_POWERF;
 349                 strcpy(acpi_device_name(device),
 350                        ACPI_BUTTON_DEVICE_NAME_POWERF);
 351                 sprintf(acpi_device_class(device), "%s/%s",
 352                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
 353         } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEP)) {
 354                 button->type = ACPI_BUTTON_TYPE_SLEEP;
 355                 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_SLEEP);
 356                 sprintf(acpi_device_class(device), "%s/%s",
 357                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
 358         } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF)) {
 359                 button->type = ACPI_BUTTON_TYPE_SLEEPF;
 360                 strcpy(acpi_device_name(device),
 361                        ACPI_BUTTON_DEVICE_NAME_SLEEPF);
 362                 sprintf(acpi_device_class(device), "%s/%s",
 363                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
 364         } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_LID)) {
 365                 button->type = ACPI_BUTTON_TYPE_LID;
 366                 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_LID);
 367                 sprintf(acpi_device_class(device), "%s/%s",
 368                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
 369         } else {
 370                 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n",
 371                             acpi_device_hid(device));
 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),
 381                  "%s/button/input0", acpi_device_hid(device));
 382
 383         input->name = acpi_device_name(device);
 384         input->phys = button->phys;
 385         input->id.bustype = BUS_HOST;
 386         input->id.product = button->type;
 387         input->dev.parent = &device->dev;
 388
 389         switch (button->type) {
 390         case ACPI_BUTTON_TYPE_POWER:
 391         case ACPI_BUTTON_TYPE_POWERF:
 392                 input->evbit[0] = BIT_MASK(EV_KEY);
 393                 set_bit(KEY_POWER, input->keybit);
 394                 break;
 395
 396         case ACPI_BUTTON_TYPE_SLEEP:
 397         case ACPI_BUTTON_TYPE_SLEEPF:
 398                 input->evbit[0] = BIT_MASK(EV_KEY);
 399                 set_bit(KEY_SLEEP, input->keybit);
 400                 break;
 401
 402         case ACPI_BUTTON_TYPE_LID:
 403                 input->evbit[0] = BIT_MASK(EV_SW);
 404                 set_bit(SW_LID, input->swbit);
 405                 break;
 406         }
 407
 408         error = input_register_device(input);
 409         if (error)
 410                 goto err_remove_fs;
 411         if (button->type == ACPI_BUTTON_TYPE_LID)
 412                 acpi_lid_send_state(button);
 413
 414         if (device->wakeup.flags.valid) {
 415                 /* Button's GPE is run-wake GPE */
 416                 acpi_set_gpe_type(device->wakeup.gpe_device,
 417                                   device->wakeup.gpe_number,
 418                                   ACPI_GPE_TYPE_WAKE_RUN);
 419                 acpi_enable_gpe(device->wakeup.gpe_device,
 420                                 device->wakeup.gpe_number);
 421                 device->wakeup.state.enabled = 1;
 422         }
 423
 424         printk(KERN_INFO PREFIX "%s [%s]\n",
 425                acpi_device_name(device), acpi_device_bid(device));
 426         return 0;
 427
 428  err_remove_fs:
 429         acpi_button_remove_fs(device);
 430  err_free_input:
 431         input_free_device(input);
 432  err_free_button:
 433         kfree(button);
 434         return error;
 435 }
 436
 437 static int acpi_button_remove(struct acpi_device *device, int type)
 438 {
 439         struct acpi_button *button;
 440
 441         if (!device || !acpi_driver_data(device))
 442                 return -EINVAL;
 443
 444         button = acpi_driver_data(device);
 445
 446         acpi_button_remove_fs(device);
 447         input_unregister_device(button->input);
 448         kfree(button);
 449         return 0;
 450 }
 451
 452 static int __init acpi_button_init(void)
 453 {
 454         int result;
 455
 456         acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
 457         if (!acpi_button_dir)
 458                 return -ENODEV;
 459
 460         result = acpi_bus_register_driver(&acpi_button_driver);
 461         if (result < 0) {
 462                 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
 463                 return -ENODEV;
 464         }
 465
 466         return 0;
 467 }
 468
 469 static void __exit acpi_button_exit(void)
 470 {
 471         acpi_bus_unregister_driver(&acpi_button_driver);
 472
 473         if (acpi_power_dir)
 474                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir);
 475         if (acpi_sleep_dir)
 476                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir);
 477         if (acpi_lid_dir)
 478                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
 479         remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
 480 }
 481
 482 module_init(acpi_button_init);
 483 module_exit(acpi_button_exit);