SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 <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         seq_printf(seq, "type:                    %s\n",
 132                    acpi_device_name(button->device));
 133         return 0;
 134 }
 135
 136 static int acpi_button_info_open_fs(struct inode *inode, struct file *file)
 137 {
 138         return single_open(file, acpi_button_info_seq_show, PDE(inode)->data);
 139 }
 140
 141 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
 142 {
 143         struct acpi_button *button = seq->private;
 144         acpi_status status;
 145         unsigned long long state;
 146
 147         status = acpi_evaluate_integer(button->device->handle, "_LID", NULL, &state);
 148         seq_printf(seq, "state:      %s\n",
 149                    ACPI_FAILURE(status) ? "unsupported" :
 150                         (state ? "open" : "closed"));
 151         return 0;
 152 }
 153
 154 static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
 155 {
 156         return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
 157 }
 158
 159 static struct proc_dir_entry *acpi_power_dir;
 160 static struct proc_dir_entry *acpi_sleep_dir;
 161 static struct proc_dir_entry *acpi_lid_dir;
 162
 163 static int acpi_button_add_fs(struct acpi_device *device)
 164 {
 165         struct proc_dir_entry *entry = NULL;
 166         struct acpi_button *button;
 167
 168         button = acpi_driver_data(device);
 169
 170         switch (button->type) {
 171         case ACPI_BUTTON_TYPE_POWER:
 172         case ACPI_BUTTON_TYPE_POWERF:
 173                 if (!acpi_power_dir)
 174                         acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER,
 175                                                     acpi_button_dir);
 176                 entry = acpi_power_dir;
 177                 break;
 178         case ACPI_BUTTON_TYPE_SLEEP:
 179         case ACPI_BUTTON_TYPE_SLEEPF:
 180                 if (!acpi_sleep_dir)
 181                         acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP,
 182                                                     acpi_button_dir);
 183                 entry = acpi_sleep_dir;
 184                 break;
 185         case ACPI_BUTTON_TYPE_LID:
 186                 if (!acpi_lid_dir)
 187                         acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID,
 188                                                   acpi_button_dir);
 189                 entry = acpi_lid_dir;
 190                 break;
 191         }
 192
 193         if (!entry)
 194                 return -ENODEV;
 195
 196         acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
 197         if (!acpi_device_dir(device))
 198                 return -ENODEV;
 199
 200         /* 'info' [R] */
 201         entry = proc_create_data(ACPI_BUTTON_FILE_INFO,
 202                                  S_IRUGO, acpi_device_dir(device),
 203                                  &acpi_button_info_fops,
 204                                  acpi_driver_data(device));
 205         if (!entry)
 206                 return -ENODEV;
 207
 208         /* show lid state [R] */
 209         if (button->type == ACPI_BUTTON_TYPE_LID) {
 210                 entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
 211                                          S_IRUGO, acpi_device_dir(device),
 212                                          &acpi_button_state_fops,
 213                                          acpi_driver_data(device));
 214                 if (!entry)
 215                         return -ENODEV;
 216         }
 217
 218         return 0;
 219 }
 220
 221 static int acpi_button_remove_fs(struct acpi_device *device)
 222 {
 223         struct acpi_button *button = acpi_driver_data(device);
 224
 225         if (acpi_device_dir(device)) {
 226                 if (button->type == ACPI_BUTTON_TYPE_LID)
 227                         remove_proc_entry(ACPI_BUTTON_FILE_STATE,
 228                                           acpi_device_dir(device));
 229                 remove_proc_entry(ACPI_BUTTON_FILE_INFO,
 230                                   acpi_device_dir(device));
 231
 232                 remove_proc_entry(acpi_device_bid(device),
 233                                   acpi_device_dir(device)->parent);
 234                 acpi_device_dir(device) = NULL;
 235         }
 236
 237         return 0;
 238 }
 239
 240 /* --------------------------------------------------------------------------
 241                                 Driver Interface
 242    -------------------------------------------------------------------------- */
 243 static int acpi_lid_send_state(struct acpi_button *button)
 244 {
 245         unsigned long long state;
 246         acpi_status status;
 247
 248         status = acpi_evaluate_integer(button->device->handle, "_LID", NULL,
 249                                         &state);
 250         if (ACPI_FAILURE(status))
 251                 return -ENODEV;
 252
 253         /* input layer checks if event is redundant */
 254         input_report_switch(button->input, SW_LID, !state);
 255         input_sync(button->input);
 256         return 0;
 257 }
 258
 259 static void acpi_button_notify(struct acpi_device *device, u32 event)
 260 {
 261         struct acpi_button *button = acpi_driver_data(device);
 262         struct input_dev *input;
 263
 264         switch (event) {
 265         case ACPI_FIXED_HARDWARE_EVENT:
 266                 event = ACPI_BUTTON_NOTIFY_STATUS;
 267                 /* fall through */
 268         case ACPI_BUTTON_NOTIFY_STATUS:
 269                 input = button->input;
 270                 if (button->type == ACPI_BUTTON_TYPE_LID) {
 271                         acpi_lid_send_state(button);
 272                 } else {
 273                         int keycode = test_bit(KEY_SLEEP, input->keybit) ?
 274                                                 KEY_SLEEP : KEY_POWER;
 275
 276                         input_report_key(input, keycode, 1);
 277                         input_sync(input);
 278                         input_report_key(input, keycode, 0);
 279                         input_sync(input);
 280                 }
 281
 282                 acpi_bus_generate_proc_event(button->device, event,
 283                                         ++button->pushed);
 284                 break;
 285         default:
 286                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 287                                   "Unsupported event [0x%x]\n", event));
 288                 break;
 289         }
 290 }
 291
 292 static int acpi_button_resume(struct acpi_device *device)
 293 {
 294         struct acpi_button *button;
 295
 296         button = acpi_driver_data(device);
 297         if (button->type == ACPI_BUTTON_TYPE_LID)
 298                 return acpi_lid_send_state(button);
 299         return 0;
 300 }
 301
 302 static int acpi_button_add(struct acpi_device *device)
 303 {
 304         int error;
 305         struct acpi_button *button;
 306         struct input_dev *input;
 307
 308         button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
 309         if (!button)
 310                 return -ENOMEM;
 311
 312         button->device = device;
 313         device->driver_data = button;
 314
 315         button->input = input = input_allocate_device();
 316         if (!input) {
 317                 error = -ENOMEM;
 318                 goto err_free_button;
 319         }
 320
 321         /*
 322          * Determine the button type (via hid), as fixed-feature buttons
 323          * need to be handled a bit differently than generic-space.
 324          */
 325         if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWER)) {
 326                 button->type = ACPI_BUTTON_TYPE_POWER;
 327                 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_POWER);
 328                 sprintf(acpi_device_class(device), "%s/%s",
 329                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
 330         } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF)) {
 331                 button->type = ACPI_BUTTON_TYPE_POWERF;
 332                 strcpy(acpi_device_name(device),
 333                        ACPI_BUTTON_DEVICE_NAME_POWERF);
 334                 sprintf(acpi_device_class(device), "%s/%s",
 335                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
 336         } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEP)) {
 337                 button->type = ACPI_BUTTON_TYPE_SLEEP;
 338                 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_SLEEP);
 339                 sprintf(acpi_device_class(device), "%s/%s",
 340                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
 341         } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF)) {
 342                 button->type = ACPI_BUTTON_TYPE_SLEEPF;
 343                 strcpy(acpi_device_name(device),
 344                        ACPI_BUTTON_DEVICE_NAME_SLEEPF);
 345                 sprintf(acpi_device_class(device), "%s/%s",
 346                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
 347         } else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_LID)) {
 348                 button->type = ACPI_BUTTON_TYPE_LID;
 349                 strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_LID);
 350                 sprintf(acpi_device_class(device), "%s/%s",
 351                         ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
 352         } else {
 353                 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n",
 354                             acpi_device_hid(device));
 355                 error = -ENODEV;
 356                 goto err_free_input;
 357         }
 358
 359         error = acpi_button_add_fs(device);
 360         if (error)
 361                 goto err_free_input;
 362
 363         snprintf(button->phys, sizeof(button->phys),
 364                  "%s/button/input0", acpi_device_hid(device));
 365
 366         input->name = acpi_device_name(device);
 367         input->phys = button->phys;
 368         input->id.bustype = BUS_HOST;
 369         input->id.product = button->type;
 370         input->dev.parent = &device->dev;
 371
 372         switch (button->type) {
 373         case ACPI_BUTTON_TYPE_POWER:
 374         case ACPI_BUTTON_TYPE_POWERF:
 375                 input->evbit[0] = BIT_MASK(EV_KEY);
 376                 set_bit(KEY_POWER, input->keybit);
 377                 break;
 378
 379         case ACPI_BUTTON_TYPE_SLEEP:
 380         case ACPI_BUTTON_TYPE_SLEEPF:
 381                 input->evbit[0] = BIT_MASK(EV_KEY);
 382                 set_bit(KEY_SLEEP, input->keybit);
 383                 break;
 384
 385         case ACPI_BUTTON_TYPE_LID:
 386                 input->evbit[0] = BIT_MASK(EV_SW);
 387                 set_bit(SW_LID, input->swbit);
 388                 break;
 389         }
 390
 391         error = input_register_device(input);
 392         if (error)
 393                 goto err_remove_fs;
 394         if (button->type == ACPI_BUTTON_TYPE_LID)
 395                 acpi_lid_send_state(button);
 396
 397         if (device->wakeup.flags.valid) {
 398                 /* Button's GPE is run-wake GPE */
 399                 acpi_set_gpe_type(device->wakeup.gpe_device,
 400                                   device->wakeup.gpe_number,
 401                                   ACPI_GPE_TYPE_WAKE_RUN);
 402                 acpi_enable_gpe(device->wakeup.gpe_device,
 403                                 device->wakeup.gpe_number);
 404                 device->wakeup.state.enabled = 1;
 405         }
 406
 407         printk(KERN_INFO PREFIX "%s [%s]\n",
 408                acpi_device_name(device), acpi_device_bid(device));
 409         return 0;
 410
 411  err_remove_fs:
 412         acpi_button_remove_fs(device);
 413  err_free_input:
 414         input_free_device(input);
 415  err_free_button:
 416         kfree(button);
 417         return error;
 418 }
 419
 420 static int acpi_button_remove(struct acpi_device *device, int type)
 421 {
 422         struct acpi_button *button;
 423
 424         button = acpi_driver_data(device);
 425
 426         acpi_button_remove_fs(device);
 427         input_unregister_device(button->input);
 428         kfree(button);
 429         return 0;
 430 }
 431
 432 static int __init acpi_button_init(void)
 433 {
 434         int result;
 435
 436         acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
 437         if (!acpi_button_dir)
 438                 return -ENODEV;
 439
 440         result = acpi_bus_register_driver(&acpi_button_driver);
 441         if (result < 0) {
 442                 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
 443                 return -ENODEV;
 444         }
 445
 446         return 0;
 447 }
 448
 449 static void __exit acpi_button_exit(void)
 450 {
 451         acpi_bus_unregister_driver(&acpi_button_driver);
 452
 453         if (acpi_power_dir)
 454                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir);
 455         if (acpi_sleep_dir)
 456                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir);
 457         if (acpi_lid_dir)
 458                 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
 459         remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
 460 }
 461
 462 module_init(acpi_button_init);
 463 module_exit(acpi_button_exit);