kernel/drivers/acpi/ac.c

   1 /*
   2  *  acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
   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/slab.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/dmi.h>
  32 #include <linux/delay.h>
  33 #ifdef CONFIG_ACPI_PROCFS_POWER
  34 #include <linux/proc_fs.h>
  35 #include <linux/seq_file.h>
  36 #endif
  37 #include <linux/platform_device.h>
  38 #include <linux/power_supply.h>
  39 #include <linux/acpi.h>
  40 #include "battery.h"
  41
  42 #define PREFIX "ACPI: "
  43
  44 #define ACPI_AC_CLASS                   "ac_adapter"
  45 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
  46 #define ACPI_AC_FILE_STATE              "state"
  47 #define ACPI_AC_NOTIFY_STATUS           0x80
  48 #define ACPI_AC_STATUS_OFFLINE          0x00
  49 #define ACPI_AC_STATUS_ONLINE           0x01
  50 #define ACPI_AC_STATUS_UNKNOWN          0xFF
  51
  52 #define _COMPONENT              ACPI_AC_COMPONENT
  53 ACPI_MODULE_NAME("ac");
  54
  55 MODULE_AUTHOR("Paul Diefenbaugh");
  56 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
  57 MODULE_LICENSE("GPL");
  58
  59
  60 static int acpi_ac_add(struct acpi_device *device);
  61 static int acpi_ac_remove(struct acpi_device *device);
  62 static void acpi_ac_notify(struct acpi_device *device, u32 event);
  63
  64 static const struct acpi_device_id ac_device_ids[] = {
  65         {"ACPI0003", 0},
  66         {"", 0},
  67 };
  68 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  69
  70 #ifdef CONFIG_PM_SLEEP
  71 static int acpi_ac_resume(struct device *dev);
  72 #endif
  73 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
  74
  75 #ifdef CONFIG_ACPI_PROCFS_POWER
  76 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  77 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  78 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
  79 #endif
  80
  81
  82 static int ac_sleep_before_get_state_ms;
  83
  84 static struct acpi_driver acpi_ac_driver = {
  85         .name = "ac",
  86         .class = ACPI_AC_CLASS,
  87         .ids = ac_device_ids,
  88         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
  89         .ops = {
  90                 .add = acpi_ac_add,
  91                 .remove = acpi_ac_remove,
  92                 .notify = acpi_ac_notify,
  93                 },
  94         .drv.pm = &acpi_ac_pm,
  95 };
  96
  97 struct acpi_ac {
  98         struct power_supply *charger;
  99         struct power_supply_desc charger_desc;
 100         struct acpi_device * device;
 101         unsigned long long state;
 102         struct notifier_block battery_nb;
 103 };
 104
 105 #define to_acpi_ac(x) power_supply_get_drvdata(x)
 106
 107 #ifdef CONFIG_ACPI_PROCFS_POWER
 108 static const struct file_operations acpi_ac_fops = {
 109         .owner = THIS_MODULE,
 110         .open = acpi_ac_open_fs,
 111         .read = seq_read,
 112         .llseek = seq_lseek,
 113         .release = single_release,
 114 };
 115 #endif
 116
 117 /* --------------------------------------------------------------------------
 118                                AC Adapter Management
 119    -------------------------------------------------------------------------- */
 120
 121 static int acpi_ac_get_state(struct acpi_ac *ac)
 122 {
 123         acpi_status status = AE_OK;
 124
 125         if (!ac)
 126                 return -EINVAL;
 127
 128         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
 129                                        &ac->state);
 130         if (ACPI_FAILURE(status)) {
 131                 ACPI_EXCEPTION((AE_INFO, status,
 132                                 "Error reading AC Adapter state"));
 133                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 134                 return -ENODEV;
 135         }
 136
 137         return 0;
 138 }
 139
 140 /* --------------------------------------------------------------------------
 141                             sysfs I/F
 142    -------------------------------------------------------------------------- */
 143 static int get_ac_property(struct power_supply *psy,
 144                            enum power_supply_property psp,
 145                            union power_supply_propval *val)
 146 {
 147         struct acpi_ac *ac = to_acpi_ac(psy);
 148
 149         if (!ac)
 150                 return -ENODEV;
 151
 152         if (acpi_ac_get_state(ac))
 153                 return -ENODEV;
 154
 155         switch (psp) {
 156         case POWER_SUPPLY_PROP_ONLINE:
 157                 val->intval = ac->state;
 158                 break;
 159         default:
 160                 return -EINVAL;
 161         }
 162         return 0;
 163 }
 164
 165 static enum power_supply_property ac_props[] = {
 166         POWER_SUPPLY_PROP_ONLINE,
 167 };
 168
 169 #ifdef CONFIG_ACPI_PROCFS_POWER
 170 /* --------------------------------------------------------------------------
 171                               FS Interface (/proc)
 172    -------------------------------------------------------------------------- */
 173
 174 static struct proc_dir_entry *acpi_ac_dir;
 175
 176 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 177 {
 178         struct acpi_ac *ac = seq->private;
 179
 180
 181         if (!ac)
 182                 return 0;
 183
 184         if (acpi_ac_get_state(ac)) {
 185                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 186                 return 0;
 187         }
 188
 189         seq_puts(seq, "state:                   ");
 190         switch (ac->state) {
 191         case ACPI_AC_STATUS_OFFLINE:
 192                 seq_puts(seq, "off-line\n");
 193                 break;
 194         case ACPI_AC_STATUS_ONLINE:
 195                 seq_puts(seq, "on-line\n");
 196                 break;
 197         default:
 198                 seq_puts(seq, "unknown\n");
 199                 break;
 200         }
 201
 202         return 0;
 203 }
 204
 205 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
 206 {
 207         return single_open(file, acpi_ac_seq_show, PDE_DATA(inode));
 208 }
 209
 210 static int acpi_ac_add_fs(struct acpi_ac *ac)
 211 {
 212         struct proc_dir_entry *entry = NULL;
 213
 214         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
 215                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 216         if (!acpi_device_dir(ac->device)) {
 217                 acpi_device_dir(ac->device) =
 218                         proc_mkdir(acpi_device_bid(ac->device), acpi_ac_dir);
 219                 if (!acpi_device_dir(ac->device))
 220                         return -ENODEV;
 221         }
 222
 223         /* 'state' [R] */
 224         entry = proc_create_data(ACPI_AC_FILE_STATE,
 225                                  S_IRUGO, acpi_device_dir(ac->device),
 226                                  &acpi_ac_fops, ac);
 227         if (!entry)
 228                 return -ENODEV;
 229         return 0;
 230 }
 231
 232 static int acpi_ac_remove_fs(struct acpi_ac *ac)
 233 {
 234
 235         if (acpi_device_dir(ac->device)) {
 236                 remove_proc_entry(ACPI_AC_FILE_STATE,
 237                                   acpi_device_dir(ac->device));
 238                 remove_proc_entry(acpi_device_bid(ac->device), acpi_ac_dir);
 239                 acpi_device_dir(ac->device) = NULL;
 240         }
 241
 242         return 0;
 243 }
 244 #endif
 245
 246 /* --------------------------------------------------------------------------
 247                                    Driver Model
 248    -------------------------------------------------------------------------- */
 249
 250 static void acpi_ac_notify(struct acpi_device *device, u32 event)
 251 {
 252         struct acpi_ac *ac = acpi_driver_data(device);
 253
 254         if (!ac)
 255                 return;
 256
 257         switch (event) {
 258         default:
 259                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 260                                   "Unsupported event [0x%x]\n", event));
 261         case ACPI_AC_NOTIFY_STATUS:
 262         case ACPI_NOTIFY_BUS_CHECK:
 263         case ACPI_NOTIFY_DEVICE_CHECK:
 264                 /*
 265                  * A buggy BIOS may notify AC first and then sleep for
 266                  * a specific time before doing actual operations in the
 267                  * EC event handler (_Qxx). This will cause the AC state
 268                  * reported by the ACPI event to be incorrect, so wait for a
 269                  * specific time for the EC event handler to make progress.
 270                  */
 271                 if (ac_sleep_before_get_state_ms > 0)
 272                         msleep(ac_sleep_before_get_state_ms);
 273
 274                 acpi_ac_get_state(ac);
 275                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 276                                                   dev_name(&device->dev), event,
 277                                                   (u32) ac->state);
 278                 acpi_notifier_call_chain(device, event, (u32) ac->state);
 279                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
 280         }
 281
 282         return;
 283 }
 284
 285 static int acpi_ac_battery_notify(struct notifier_block *nb,
 286                                   unsigned long action, void *data)
 287 {
 288         struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
 289         struct acpi_bus_event *event = (struct acpi_bus_event *)data;
 290
 291         /*
 292          * On HP Pavilion dv6-6179er AC status notifications aren't triggered
 293          * when adapter is plugged/unplugged. However, battery status
 294          * notifcations are triggered when battery starts charging or
 295          * discharging. Re-reading AC status triggers lost AC notifications,
 296          * if AC status has changed.
 297          */
 298         if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
 299             event->type == ACPI_BATTERY_NOTIFY_STATUS)
 300                 acpi_ac_get_state(ac);
 301
 302         return NOTIFY_OK;
 303 }
 304
 305 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
 306 {
 307         ac_sleep_before_get_state_ms = 1000;
 308         return 0;
 309 }
 310
 311 static struct dmi_system_id ac_dmi_table[] = {
 312         {
 313         .callback = thinkpad_e530_quirk,
 314         .ident = "thinkpad e530",
 315         .matches = {
 316                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 317                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
 318                 },
 319         },
 320         {},
 321 };
 322
 323 static int acpi_ac_add(struct acpi_device *device)
 324 {
 325         struct power_supply_config psy_cfg = {};
 326         int result = 0;
 327         struct acpi_ac *ac = NULL;
 328
 329
 330         if (!device)
 331                 return -EINVAL;
 332
 333         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 334         if (!ac)
 335                 return -ENOMEM;
 336
 337         ac->device = device;
 338         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 339         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 340         device->driver_data = ac;
 341
 342         result = acpi_ac_get_state(ac);
 343         if (result)
 344                 goto end;
 345
 346         psy_cfg.drv_data = ac;
 347
 348         ac->charger_desc.name = acpi_device_bid(device);
 349 #ifdef CONFIG_ACPI_PROCFS_POWER
 350         result = acpi_ac_add_fs(ac);
 351         if (result)
 352                 goto end;
 353 #endif
 354         ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
 355         ac->charger_desc.properties = ac_props;
 356         ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
 357         ac->charger_desc.get_property = get_ac_property;
 358         ac->charger = power_supply_register(&ac->device->dev,
 359                                             &ac->charger_desc, &psy_cfg);
 360         if (IS_ERR(ac->charger)) {
 361                 result = PTR_ERR(ac->charger);
 362                 goto end;
 363         }
 364
 365         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 366                acpi_device_name(device), acpi_device_bid(device),
 367                ac->state ? "on-line" : "off-line");
 368
 369         ac->battery_nb.notifier_call = acpi_ac_battery_notify;
 370         register_acpi_notifier(&ac->battery_nb);
 371 end:
 372         if (result) {
 373 #ifdef CONFIG_ACPI_PROCFS_POWER
 374                 acpi_ac_remove_fs(ac);
 375 #endif
 376                 kfree(ac);
 377         }
 378
 379         dmi_check_system(ac_dmi_table);
 380         return result;
 381 }
 382
 383 #ifdef CONFIG_PM_SLEEP
 384 static int acpi_ac_resume(struct device *dev)
 385 {
 386         struct acpi_ac *ac;
 387         unsigned old_state;
 388
 389         if (!dev)
 390                 return -EINVAL;
 391
 392         ac = acpi_driver_data(to_acpi_device(dev));
 393         if (!ac)
 394                 return -EINVAL;
 395
 396         old_state = ac->state;
 397         if (acpi_ac_get_state(ac))
 398                 return 0;
 399         if (old_state != ac->state)
 400                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
 401         return 0;
 402 }
 403 #else
 404 #define acpi_ac_resume NULL
 405 #endif
 406
 407 static int acpi_ac_remove(struct acpi_device *device)
 408 {
 409         struct acpi_ac *ac = NULL;
 410
 411
 412         if (!device || !acpi_driver_data(device))
 413                 return -EINVAL;
 414
 415         ac = acpi_driver_data(device);
 416
 417         power_supply_unregister(ac->charger);
 418         unregister_acpi_notifier(&ac->battery_nb);
 419
 420 #ifdef CONFIG_ACPI_PROCFS_POWER
 421         acpi_ac_remove_fs(ac);
 422 #endif
 423
 424         kfree(ac);
 425
 426         return 0;
 427 }
 428
 429 static int __init acpi_ac_init(void)
 430 {
 431         int result;
 432
 433         if (acpi_disabled)
 434                 return -ENODEV;
 435
 436 #ifdef CONFIG_ACPI_PROCFS_POWER
 437         acpi_ac_dir = acpi_lock_ac_dir();
 438         if (!acpi_ac_dir)
 439                 return -ENODEV;
 440 #endif
 441
 442
 443         result = acpi_bus_register_driver(&acpi_ac_driver);
 444         if (result < 0) {
 445 #ifdef CONFIG_ACPI_PROCFS_POWER
 446                 acpi_unlock_ac_dir(acpi_ac_dir);
 447 #endif
 448                 return -ENODEV;
 449         }
 450
 451         return 0;
 452 }
 453
 454 static void __exit acpi_ac_exit(void)
 455 {
 456         acpi_bus_unregister_driver(&acpi_ac_driver);
 457 #ifdef CONFIG_ACPI_PROCFS_POWER
 458         acpi_unlock_ac_dir(acpi_ac_dir);
 459 #endif
 460 }
 461 module_init(acpi_ac_init);
 462 module_exit(acpi_ac_exit);