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  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/slab.h>
  25 #include <linux/init.h>
  26 #include <linux/types.h>
  27 #include <linux/dmi.h>
  28 #include <linux/delay.h>
  29 #ifdef CONFIG_ACPI_PROCFS_POWER
  30 #include <linux/proc_fs.h>
  31 #include <linux/seq_file.h>
  32 #endif
  33 #include <linux/platform_device.h>
  34 #include <linux/power_supply.h>
  35 #include <linux/acpi.h>
  36 #include "battery.h"
  37
  38 #define PREFIX "ACPI: "
  39
  40 #define ACPI_AC_CLASS                   "ac_adapter"
  41 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
  42 #define ACPI_AC_FILE_STATE              "state"
  43 #define ACPI_AC_NOTIFY_STATUS           0x80
  44 #define ACPI_AC_STATUS_OFFLINE          0x00
  45 #define ACPI_AC_STATUS_ONLINE           0x01
  46 #define ACPI_AC_STATUS_UNKNOWN          0xFF
  47
  48 #define _COMPONENT              ACPI_AC_COMPONENT
  49 ACPI_MODULE_NAME("ac");
  50
  51 MODULE_AUTHOR("Paul Diefenbaugh");
  52 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
  53 MODULE_LICENSE("GPL");
  54
  55
  56 static int acpi_ac_add(struct acpi_device *device);
  57 static int acpi_ac_remove(struct acpi_device *device);
  58 static void acpi_ac_notify(struct acpi_device *device, u32 event);
  59
  60 static const struct acpi_device_id ac_device_ids[] = {
  61         {"ACPI0003", 0},
  62         {"", 0},
  63 };
  64 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  65
  66 #ifdef CONFIG_PM_SLEEP
  67 static int acpi_ac_resume(struct device *dev);
  68 #endif
  69 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
  70
  71 #ifdef CONFIG_ACPI_PROCFS_POWER
  72 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  73 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  74 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
  75 #endif
  76
  77
  78 static int ac_sleep_before_get_state_ms;
  79
  80 static struct acpi_driver acpi_ac_driver = {
  81         .name = "ac",
  82         .class = ACPI_AC_CLASS,
  83         .ids = ac_device_ids,
  84         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
  85         .ops = {
  86                 .add = acpi_ac_add,
  87                 .remove = acpi_ac_remove,
  88                 .notify = acpi_ac_notify,
  89                 },
  90         .drv.pm = &acpi_ac_pm,
  91 };
  92
  93 struct acpi_ac {
  94         struct power_supply *charger;
  95         struct power_supply_desc charger_desc;
  96         struct acpi_device * device;
  97         unsigned long long state;
  98         struct notifier_block battery_nb;
  99 };
 100
 101 #define to_acpi_ac(x) power_supply_get_drvdata(x)
 102
 103 #ifdef CONFIG_ACPI_PROCFS_POWER
 104 static const struct file_operations acpi_ac_fops = {
 105         .owner = THIS_MODULE,
 106         .open = acpi_ac_open_fs,
 107         .read = seq_read,
 108         .llseek = seq_lseek,
 109         .release = single_release,
 110 };
 111 #endif
 112
 113 /* --------------------------------------------------------------------------
 114                                AC Adapter Management
 115    -------------------------------------------------------------------------- */
 116
 117 static int acpi_ac_get_state(struct acpi_ac *ac)
 118 {
 119         acpi_status status = AE_OK;
 120
 121         if (!ac)
 122                 return -EINVAL;
 123
 124         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
 125                                        &ac->state);
 126         if (ACPI_FAILURE(status)) {
 127                 ACPI_EXCEPTION((AE_INFO, status,
 128                                 "Error reading AC Adapter state"));
 129                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 130                 return -ENODEV;
 131         }
 132
 133         return 0;
 134 }
 135
 136 /* --------------------------------------------------------------------------
 137                             sysfs I/F
 138    -------------------------------------------------------------------------- */
 139 static int get_ac_property(struct power_supply *psy,
 140                            enum power_supply_property psp,
 141                            union power_supply_propval *val)
 142 {
 143         struct acpi_ac *ac = to_acpi_ac(psy);
 144
 145         if (!ac)
 146                 return -ENODEV;
 147
 148         if (acpi_ac_get_state(ac))
 149                 return -ENODEV;
 150
 151         switch (psp) {
 152         case POWER_SUPPLY_PROP_ONLINE:
 153                 val->intval = ac->state;
 154                 break;
 155         default:
 156                 return -EINVAL;
 157         }
 158         return 0;
 159 }
 160
 161 static enum power_supply_property ac_props[] = {
 162         POWER_SUPPLY_PROP_ONLINE,
 163 };
 164
 165 #ifdef CONFIG_ACPI_PROCFS_POWER
 166 /* --------------------------------------------------------------------------
 167                               FS Interface (/proc)
 168    -------------------------------------------------------------------------- */
 169
 170 static struct proc_dir_entry *acpi_ac_dir;
 171
 172 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 173 {
 174         struct acpi_ac *ac = seq->private;
 175
 176
 177         if (!ac)
 178                 return 0;
 179
 180         if (acpi_ac_get_state(ac)) {
 181                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 182                 return 0;
 183         }
 184
 185         seq_puts(seq, "state:                   ");
 186         switch (ac->state) {
 187         case ACPI_AC_STATUS_OFFLINE:
 188                 seq_puts(seq, "off-line\n");
 189                 break;
 190         case ACPI_AC_STATUS_ONLINE:
 191                 seq_puts(seq, "on-line\n");
 192                 break;
 193         default:
 194                 seq_puts(seq, "unknown\n");
 195                 break;
 196         }
 197
 198         return 0;
 199 }
 200
 201 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
 202 {
 203         return single_open(file, acpi_ac_seq_show, PDE_DATA(inode));
 204 }
 205
 206 static int acpi_ac_add_fs(struct acpi_ac *ac)
 207 {
 208         struct proc_dir_entry *entry = NULL;
 209
 210         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
 211                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 212         if (!acpi_device_dir(ac->device)) {
 213                 acpi_device_dir(ac->device) =
 214                         proc_mkdir(acpi_device_bid(ac->device), acpi_ac_dir);
 215                 if (!acpi_device_dir(ac->device))
 216                         return -ENODEV;
 217         }
 218
 219         /* 'state' [R] */
 220         entry = proc_create_data(ACPI_AC_FILE_STATE,
 221                                  S_IRUGO, acpi_device_dir(ac->device),
 222                                  &acpi_ac_fops, ac);
 223         if (!entry)
 224                 return -ENODEV;
 225         return 0;
 226 }
 227
 228 static int acpi_ac_remove_fs(struct acpi_ac *ac)
 229 {
 230
 231         if (acpi_device_dir(ac->device)) {
 232                 remove_proc_entry(ACPI_AC_FILE_STATE,
 233                                   acpi_device_dir(ac->device));
 234                 remove_proc_entry(acpi_device_bid(ac->device), acpi_ac_dir);
 235                 acpi_device_dir(ac->device) = NULL;
 236         }
 237
 238         return 0;
 239 }
 240 #endif
 241
 242 /* --------------------------------------------------------------------------
 243                                    Driver Model
 244    -------------------------------------------------------------------------- */
 245
 246 static void acpi_ac_notify(struct acpi_device *device, u32 event)
 247 {
 248         struct acpi_ac *ac = acpi_driver_data(device);
 249
 250         if (!ac)
 251                 return;
 252
 253         switch (event) {
 254         default:
 255                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 256                                   "Unsupported event [0x%x]\n", event));
 257         case ACPI_AC_NOTIFY_STATUS:
 258         case ACPI_NOTIFY_BUS_CHECK:
 259         case ACPI_NOTIFY_DEVICE_CHECK:
 260                 /*
 261                  * A buggy BIOS may notify AC first and then sleep for
 262                  * a specific time before doing actual operations in the
 263                  * EC event handler (_Qxx). This will cause the AC state
 264                  * reported by the ACPI event to be incorrect, so wait for a
 265                  * specific time for the EC event handler to make progress.
 266                  */
 267                 if (ac_sleep_before_get_state_ms > 0)
 268                         msleep(ac_sleep_before_get_state_ms);
 269
 270                 acpi_ac_get_state(ac);
 271                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 272                                                   dev_name(&device->dev), event,
 273                                                   (u32) ac->state);
 274                 acpi_notifier_call_chain(device, event, (u32) ac->state);
 275                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
 276         }
 277
 278         return;
 279 }
 280
 281 static int acpi_ac_battery_notify(struct notifier_block *nb,
 282                                   unsigned long action, void *data)
 283 {
 284         struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
 285         struct acpi_bus_event *event = (struct acpi_bus_event *)data;
 286
 287         /*
 288          * On HP Pavilion dv6-6179er AC status notifications aren't triggered
 289          * when adapter is plugged/unplugged. However, battery status
 290          * notifcations are triggered when battery starts charging or
 291          * discharging. Re-reading AC status triggers lost AC notifications,
 292          * if AC status has changed.
 293          */
 294         if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
 295             event->type == ACPI_BATTERY_NOTIFY_STATUS)
 296                 acpi_ac_get_state(ac);
 297
 298         return NOTIFY_OK;
 299 }
 300
 301 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
 302 {
 303         ac_sleep_before_get_state_ms = 1000;
 304         return 0;
 305 }
 306
 307 static const struct dmi_system_id ac_dmi_table[] = {
 308         {
 309         .callback = thinkpad_e530_quirk,
 310         .ident = "thinkpad e530",
 311         .matches = {
 312                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 313                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
 314                 },
 315         },
 316         {},
 317 };
 318
 319 static int acpi_ac_add(struct acpi_device *device)
 320 {
 321         struct power_supply_config psy_cfg = {};
 322         int result = 0;
 323         struct acpi_ac *ac = NULL;
 324
 325
 326         if (!device)
 327                 return -EINVAL;
 328
 329         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 330         if (!ac)
 331                 return -ENOMEM;
 332
 333         ac->device = device;
 334         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 335         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 336         device->driver_data = ac;
 337
 338         result = acpi_ac_get_state(ac);
 339         if (result)
 340                 goto end;
 341
 342         psy_cfg.drv_data = ac;
 343
 344         ac->charger_desc.name = acpi_device_bid(device);
 345 #ifdef CONFIG_ACPI_PROCFS_POWER
 346         result = acpi_ac_add_fs(ac);
 347         if (result)
 348                 goto end;
 349 #endif
 350         ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
 351         ac->charger_desc.properties = ac_props;
 352         ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
 353         ac->charger_desc.get_property = get_ac_property;
 354         ac->charger = power_supply_register(&ac->device->dev,
 355                                             &ac->charger_desc, &psy_cfg);
 356         if (IS_ERR(ac->charger)) {
 357                 result = PTR_ERR(ac->charger);
 358                 goto end;
 359         }
 360
 361         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 362                acpi_device_name(device), acpi_device_bid(device),
 363                ac->state ? "on-line" : "off-line");
 364
 365         ac->battery_nb.notifier_call = acpi_ac_battery_notify;
 366         register_acpi_notifier(&ac->battery_nb);
 367 end:
 368         if (result) {
 369 #ifdef CONFIG_ACPI_PROCFS_POWER
 370                 acpi_ac_remove_fs(ac);
 371 #endif
 372                 kfree(ac);
 373         }
 374
 375         dmi_check_system(ac_dmi_table);
 376         return result;
 377 }
 378
 379 #ifdef CONFIG_PM_SLEEP
 380 static int acpi_ac_resume(struct device *dev)
 381 {
 382         struct acpi_ac *ac;
 383         unsigned old_state;
 384
 385         if (!dev)
 386                 return -EINVAL;
 387
 388         ac = acpi_driver_data(to_acpi_device(dev));
 389         if (!ac)
 390                 return -EINVAL;
 391
 392         old_state = ac->state;
 393         if (acpi_ac_get_state(ac))
 394                 return 0;
 395         if (old_state != ac->state)
 396                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
 397         return 0;
 398 }
 399 #else
 400 #define acpi_ac_resume NULL
 401 #endif
 402
 403 static int acpi_ac_remove(struct acpi_device *device)
 404 {
 405         struct acpi_ac *ac = NULL;
 406
 407
 408         if (!device || !acpi_driver_data(device))
 409                 return -EINVAL;
 410
 411         ac = acpi_driver_data(device);
 412
 413         power_supply_unregister(ac->charger);
 414         unregister_acpi_notifier(&ac->battery_nb);
 415
 416 #ifdef CONFIG_ACPI_PROCFS_POWER
 417         acpi_ac_remove_fs(ac);
 418 #endif
 419
 420         kfree(ac);
 421
 422         return 0;
 423 }
 424
 425 static int __init acpi_ac_init(void)
 426 {
 427         int result;
 428
 429         if (acpi_disabled)
 430                 return -ENODEV;
 431
 432 #ifdef CONFIG_ACPI_PROCFS_POWER
 433         acpi_ac_dir = acpi_lock_ac_dir();
 434         if (!acpi_ac_dir)
 435                 return -ENODEV;
 436 #endif
 437
 438
 439         result = acpi_bus_register_driver(&acpi_ac_driver);
 440         if (result < 0) {
 441 #ifdef CONFIG_ACPI_PROCFS_POWER
 442                 acpi_unlock_ac_dir(acpi_ac_dir);
 443 #endif
 444                 return -ENODEV;
 445         }
 446
 447         return 0;
 448 }
 449
 450 static void __exit acpi_ac_exit(void)
 451 {
 452         acpi_bus_unregister_driver(&acpi_ac_driver);
 453 #ifdef CONFIG_ACPI_PROCFS_POWER
 454         acpi_unlock_ac_dir(acpi_ac_dir);
 455 #endif
 456 }
 457 module_init(acpi_ac_init);
 458 module_exit(acpi_ac_exit);