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 struct acpi_ac_bl {
  61         const char *hid;
  62         int hrv;
  63 };
  64
  65 static const struct acpi_device_id ac_device_ids[] = {
  66         {"ACPI0003", 0},
  67         {"", 0},
  68 };
  69 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  70
  71 /* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
  72 static const struct acpi_ac_bl acpi_ac_blacklist[] = {
  73         { "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
  74         { "INT34D3",  3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
  75 };
  76
  77 #ifdef CONFIG_PM_SLEEP
  78 static int acpi_ac_resume(struct device *dev);
  79 #endif
  80 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
  81
  82 #ifdef CONFIG_ACPI_PROCFS_POWER
  83 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  84 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  85 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
  86 #endif
  87
  88
  89 static int ac_sleep_before_get_state_ms;
  90
  91 static struct acpi_driver acpi_ac_driver = {
  92         .name = "ac",
  93         .class = ACPI_AC_CLASS,
  94         .ids = ac_device_ids,
  95         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
  96         .ops = {
  97                 .add = acpi_ac_add,
  98                 .remove = acpi_ac_remove,
  99                 .notify = acpi_ac_notify,
 100                 },
 101         .drv.pm = &acpi_ac_pm,
 102 };
 103
 104 struct acpi_ac {
 105         struct power_supply *charger;
 106         struct power_supply_desc charger_desc;
 107         struct acpi_device * device;
 108         unsigned long long state;
 109         struct notifier_block battery_nb;
 110 };
 111
 112 #define to_acpi_ac(x) power_supply_get_drvdata(x)
 113
 114 #ifdef CONFIG_ACPI_PROCFS_POWER
 115 static const struct file_operations acpi_ac_fops = {
 116         .owner = THIS_MODULE,
 117         .open = acpi_ac_open_fs,
 118         .read = seq_read,
 119         .llseek = seq_lseek,
 120         .release = single_release,
 121 };
 122 #endif
 123
 124 /* --------------------------------------------------------------------------
 125                                AC Adapter Management
 126    -------------------------------------------------------------------------- */
 127
 128 static int acpi_ac_get_state(struct acpi_ac *ac)
 129 {
 130         acpi_status status = AE_OK;
 131
 132         if (!ac)
 133                 return -EINVAL;
 134
 135         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
 136                                        &ac->state);
 137         if (ACPI_FAILURE(status)) {
 138                 ACPI_EXCEPTION((AE_INFO, status,
 139                                 "Error reading AC Adapter state"));
 140                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 141                 return -ENODEV;
 142         }
 143
 144         return 0;
 145 }
 146
 147 /* --------------------------------------------------------------------------
 148                             sysfs I/F
 149    -------------------------------------------------------------------------- */
 150 static int get_ac_property(struct power_supply *psy,
 151                            enum power_supply_property psp,
 152                            union power_supply_propval *val)
 153 {
 154         struct acpi_ac *ac = to_acpi_ac(psy);
 155
 156         if (!ac)
 157                 return -ENODEV;
 158
 159         if (acpi_ac_get_state(ac))
 160                 return -ENODEV;
 161
 162         switch (psp) {
 163         case POWER_SUPPLY_PROP_ONLINE:
 164                 val->intval = ac->state;
 165                 break;
 166         default:
 167                 return -EINVAL;
 168         }
 169         return 0;
 170 }
 171
 172 static enum power_supply_property ac_props[] = {
 173         POWER_SUPPLY_PROP_ONLINE,
 174 };
 175
 176 #ifdef CONFIG_ACPI_PROCFS_POWER
 177 /* --------------------------------------------------------------------------
 178                               FS Interface (/proc)
 179    -------------------------------------------------------------------------- */
 180
 181 static struct proc_dir_entry *acpi_ac_dir;
 182
 183 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 184 {
 185         struct acpi_ac *ac = seq->private;
 186
 187
 188         if (!ac)
 189                 return 0;
 190
 191         if (acpi_ac_get_state(ac)) {
 192                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 193                 return 0;
 194         }
 195
 196         seq_puts(seq, "state:                   ");
 197         switch (ac->state) {
 198         case ACPI_AC_STATUS_OFFLINE:
 199                 seq_puts(seq, "off-line\n");
 200                 break;
 201         case ACPI_AC_STATUS_ONLINE:
 202                 seq_puts(seq, "on-line\n");
 203                 break;
 204         default:
 205                 seq_puts(seq, "unknown\n");
 206                 break;
 207         }
 208
 209         return 0;
 210 }
 211
 212 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
 213 {
 214         return single_open(file, acpi_ac_seq_show, PDE_DATA(inode));
 215 }
 216
 217 static int acpi_ac_add_fs(struct acpi_ac *ac)
 218 {
 219         struct proc_dir_entry *entry = NULL;
 220
 221         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
 222                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 223         if (!acpi_device_dir(ac->device)) {
 224                 acpi_device_dir(ac->device) =
 225                         proc_mkdir(acpi_device_bid(ac->device), acpi_ac_dir);
 226                 if (!acpi_device_dir(ac->device))
 227                         return -ENODEV;
 228         }
 229
 230         /* 'state' [R] */
 231         entry = proc_create_data(ACPI_AC_FILE_STATE,
 232                                  S_IRUGO, acpi_device_dir(ac->device),
 233                                  &acpi_ac_fops, ac);
 234         if (!entry)
 235                 return -ENODEV;
 236         return 0;
 237 }
 238
 239 static int acpi_ac_remove_fs(struct acpi_ac *ac)
 240 {
 241
 242         if (acpi_device_dir(ac->device)) {
 243                 remove_proc_entry(ACPI_AC_FILE_STATE,
 244                                   acpi_device_dir(ac->device));
 245                 remove_proc_entry(acpi_device_bid(ac->device), acpi_ac_dir);
 246                 acpi_device_dir(ac->device) = NULL;
 247         }
 248
 249         return 0;
 250 }
 251 #endif
 252
 253 /* --------------------------------------------------------------------------
 254                                    Driver Model
 255    -------------------------------------------------------------------------- */
 256
 257 static void acpi_ac_notify(struct acpi_device *device, u32 event)
 258 {
 259         struct acpi_ac *ac = acpi_driver_data(device);
 260
 261         if (!ac)
 262                 return;
 263
 264         switch (event) {
 265         default:
 266                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 267                                   "Unsupported event [0x%x]\n", event));
 268         case ACPI_AC_NOTIFY_STATUS:
 269         case ACPI_NOTIFY_BUS_CHECK:
 270         case ACPI_NOTIFY_DEVICE_CHECK:
 271                 /*
 272                  * A buggy BIOS may notify AC first and then sleep for
 273                  * a specific time before doing actual operations in the
 274                  * EC event handler (_Qxx). This will cause the AC state
 275                  * reported by the ACPI event to be incorrect, so wait for a
 276                  * specific time for the EC event handler to make progress.
 277                  */
 278                 if (ac_sleep_before_get_state_ms > 0)
 279                         msleep(ac_sleep_before_get_state_ms);
 280
 281                 acpi_ac_get_state(ac);
 282                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 283                                                   dev_name(&device->dev), event,
 284                                                   (u32) ac->state);
 285                 acpi_notifier_call_chain(device, event, (u32) ac->state);
 286                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
 287         }
 288
 289         return;
 290 }
 291
 292 static int acpi_ac_battery_notify(struct notifier_block *nb,
 293                                   unsigned long action, void *data)
 294 {
 295         struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
 296         struct acpi_bus_event *event = (struct acpi_bus_event *)data;
 297
 298         /*
 299          * On HP Pavilion dv6-6179er AC status notifications aren't triggered
 300          * when adapter is plugged/unplugged. However, battery status
 301          * notifcations are triggered when battery starts charging or
 302          * discharging. Re-reading AC status triggers lost AC notifications,
 303          * if AC status has changed.
 304          */
 305         if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
 306             event->type == ACPI_BATTERY_NOTIFY_STATUS)
 307                 acpi_ac_get_state(ac);
 308
 309         return NOTIFY_OK;
 310 }
 311
 312 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
 313 {
 314         ac_sleep_before_get_state_ms = 1000;
 315         return 0;
 316 }
 317
 318 static const struct dmi_system_id ac_dmi_table[] = {
 319         {
 320         .callback = thinkpad_e530_quirk,
 321         .ident = "thinkpad e530",
 322         .matches = {
 323                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 324                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
 325                 },
 326         },
 327         {},
 328 };
 329
 330 static int acpi_ac_add(struct acpi_device *device)
 331 {
 332         struct power_supply_config psy_cfg = {};
 333         int result = 0;
 334         struct acpi_ac *ac = NULL;
 335
 336
 337         if (!device)
 338                 return -EINVAL;
 339
 340         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 341         if (!ac)
 342                 return -ENOMEM;
 343
 344         ac->device = device;
 345         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 346         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 347         device->driver_data = ac;
 348
 349         result = acpi_ac_get_state(ac);
 350         if (result)
 351                 goto end;
 352
 353         psy_cfg.drv_data = ac;
 354
 355         ac->charger_desc.name = acpi_device_bid(device);
 356 #ifdef CONFIG_ACPI_PROCFS_POWER
 357         result = acpi_ac_add_fs(ac);
 358         if (result)
 359                 goto end;
 360 #endif
 361         ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
 362         ac->charger_desc.properties = ac_props;
 363         ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
 364         ac->charger_desc.get_property = get_ac_property;
 365         ac->charger = power_supply_register(&ac->device->dev,
 366                                             &ac->charger_desc, &psy_cfg);
 367         if (IS_ERR(ac->charger)) {
 368                 result = PTR_ERR(ac->charger);
 369                 goto end;
 370         }
 371
 372         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 373                acpi_device_name(device), acpi_device_bid(device),
 374                ac->state ? "on-line" : "off-line");
 375
 376         ac->battery_nb.notifier_call = acpi_ac_battery_notify;
 377         register_acpi_notifier(&ac->battery_nb);
 378 end:
 379         if (result) {
 380 #ifdef CONFIG_ACPI_PROCFS_POWER
 381                 acpi_ac_remove_fs(ac);
 382 #endif
 383                 kfree(ac);
 384         }
 385
 386         dmi_check_system(ac_dmi_table);
 387         return result;
 388 }
 389
 390 #ifdef CONFIG_PM_SLEEP
 391 static int acpi_ac_resume(struct device *dev)
 392 {
 393         struct acpi_ac *ac;
 394         unsigned old_state;
 395
 396         if (!dev)
 397                 return -EINVAL;
 398
 399         ac = acpi_driver_data(to_acpi_device(dev));
 400         if (!ac)
 401                 return -EINVAL;
 402
 403         old_state = ac->state;
 404         if (acpi_ac_get_state(ac))
 405                 return 0;
 406         if (old_state != ac->state)
 407                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
 408         return 0;
 409 }
 410 #else
 411 #define acpi_ac_resume NULL
 412 #endif
 413
 414 static int acpi_ac_remove(struct acpi_device *device)
 415 {
 416         struct acpi_ac *ac = NULL;
 417
 418
 419         if (!device || !acpi_driver_data(device))
 420                 return -EINVAL;
 421
 422         ac = acpi_driver_data(device);
 423
 424         power_supply_unregister(ac->charger);
 425         unregister_acpi_notifier(&ac->battery_nb);
 426
 427 #ifdef CONFIG_ACPI_PROCFS_POWER
 428         acpi_ac_remove_fs(ac);
 429 #endif
 430
 431         kfree(ac);
 432
 433         return 0;
 434 }
 435
 436 static int __init acpi_ac_init(void)
 437 {
 438         unsigned int i;
 439         int result;
 440
 441         if (acpi_disabled)
 442                 return -ENODEV;
 443
 444         for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++)
 445                 if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1",
 446                                      acpi_ac_blacklist[i].hrv)) {
 447                         pr_info(PREFIX "AC: found native %s PMIC, not loading\n",
 448                                 acpi_ac_blacklist[i].hid);
 449                         return -ENODEV;
 450                 }
 451
 452 #ifdef CONFIG_ACPI_PROCFS_POWER
 453         acpi_ac_dir = acpi_lock_ac_dir();
 454         if (!acpi_ac_dir)
 455                 return -ENODEV;
 456 #endif
 457
 458
 459         result = acpi_bus_register_driver(&acpi_ac_driver);
 460         if (result < 0) {
 461 #ifdef CONFIG_ACPI_PROCFS_POWER
 462                 acpi_unlock_ac_dir(acpi_ac_dir);
 463 #endif
 464                 return -ENODEV;
 465         }
 466
 467         return 0;
 468 }
 469
 470 static void __exit acpi_ac_exit(void)
 471 {
 472         acpi_bus_unregister_driver(&acpi_ac_driver);
 473 #ifdef CONFIG_ACPI_PROCFS_POWER
 474         acpi_unlock_ac_dir(acpi_ac_dir);
 475 #endif
 476 }
 477 module_init(acpi_ac_init);
 478 module_exit(acpi_ac_exit);