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 <acpi/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         /* fall through */
 269         case ACPI_AC_NOTIFY_STATUS:
 270         case ACPI_NOTIFY_BUS_CHECK:
 271         case ACPI_NOTIFY_DEVICE_CHECK:
 272                 /*
 273                  * A buggy BIOS may notify AC first and then sleep for
 274                  * a specific time before doing actual operations in the
 275                  * EC event handler (_Qxx). This will cause the AC state
 276                  * reported by the ACPI event to be incorrect, so wait for a
 277                  * specific time for the EC event handler to make progress.
 278                  */
 279                 if (ac_sleep_before_get_state_ms > 0)
 280                         msleep(ac_sleep_before_get_state_ms);
 281
 282                 acpi_ac_get_state(ac);
 283                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 284                                                   dev_name(&device->dev), event,
 285                                                   (u32) ac->state);
 286                 acpi_notifier_call_chain(device, event, (u32) ac->state);
 287                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
 288         }
 289
 290         return;
 291 }
 292
 293 static int acpi_ac_battery_notify(struct notifier_block *nb,
 294                                   unsigned long action, void *data)
 295 {
 296         struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
 297         struct acpi_bus_event *event = (struct acpi_bus_event *)data;
 298
 299         /*
 300          * On HP Pavilion dv6-6179er AC status notifications aren't triggered
 301          * when adapter is plugged/unplugged. However, battery status
 302          * notifcations are triggered when battery starts charging or
 303          * discharging. Re-reading AC status triggers lost AC notifications,
 304          * if AC status has changed.
 305          */
 306         if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
 307             event->type == ACPI_BATTERY_NOTIFY_STATUS)
 308                 acpi_ac_get_state(ac);
 309
 310         return NOTIFY_OK;
 311 }
 312
 313 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
 314 {
 315         ac_sleep_before_get_state_ms = 1000;
 316         return 0;
 317 }
 318
 319 static const struct dmi_system_id ac_dmi_table[] = {
 320         {
 321         .callback = thinkpad_e530_quirk,
 322         .ident = "thinkpad e530",
 323         .matches = {
 324                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 325                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
 326                 },
 327         },
 328         {},
 329 };
 330
 331 static int acpi_ac_add(struct acpi_device *device)
 332 {
 333         struct power_supply_config psy_cfg = {};
 334         int result = 0;
 335         struct acpi_ac *ac = NULL;
 336
 337
 338         if (!device)
 339                 return -EINVAL;
 340
 341         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 342         if (!ac)
 343                 return -ENOMEM;
 344
 345         ac->device = device;
 346         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 347         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 348         device->driver_data = ac;
 349
 350         result = acpi_ac_get_state(ac);
 351         if (result)
 352                 goto end;
 353
 354         psy_cfg.drv_data = ac;
 355
 356         ac->charger_desc.name = acpi_device_bid(device);
 357 #ifdef CONFIG_ACPI_PROCFS_POWER
 358         result = acpi_ac_add_fs(ac);
 359         if (result)
 360                 goto end;
 361 #endif
 362         ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
 363         ac->charger_desc.properties = ac_props;
 364         ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
 365         ac->charger_desc.get_property = get_ac_property;
 366         ac->charger = power_supply_register(&ac->device->dev,
 367                                             &ac->charger_desc, &psy_cfg);
 368         if (IS_ERR(ac->charger)) {
 369                 result = PTR_ERR(ac->charger);
 370                 goto end;
 371         }
 372
 373         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 374                acpi_device_name(device), acpi_device_bid(device),
 375                ac->state ? "on-line" : "off-line");
 376
 377         ac->battery_nb.notifier_call = acpi_ac_battery_notify;
 378         register_acpi_notifier(&ac->battery_nb);
 379 end:
 380         if (result) {
 381 #ifdef CONFIG_ACPI_PROCFS_POWER
 382                 acpi_ac_remove_fs(ac);
 383 #endif
 384                 kfree(ac);
 385         }
 386
 387         dmi_check_system(ac_dmi_table);
 388         return result;
 389 }
 390
 391 #ifdef CONFIG_PM_SLEEP
 392 static int acpi_ac_resume(struct device *dev)
 393 {
 394         struct acpi_ac *ac;
 395         unsigned old_state;
 396
 397         if (!dev)
 398                 return -EINVAL;
 399
 400         ac = acpi_driver_data(to_acpi_device(dev));
 401         if (!ac)
 402                 return -EINVAL;
 403
 404         old_state = ac->state;
 405         if (acpi_ac_get_state(ac))
 406                 return 0;
 407         if (old_state != ac->state)
 408                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
 409         return 0;
 410 }
 411 #else
 412 #define acpi_ac_resume NULL
 413 #endif
 414
 415 static int acpi_ac_remove(struct acpi_device *device)
 416 {
 417         struct acpi_ac *ac = NULL;
 418
 419
 420         if (!device || !acpi_driver_data(device))
 421                 return -EINVAL;
 422
 423         ac = acpi_driver_data(device);
 424
 425         power_supply_unregister(ac->charger);
 426         unregister_acpi_notifier(&ac->battery_nb);
 427
 428 #ifdef CONFIG_ACPI_PROCFS_POWER
 429         acpi_ac_remove_fs(ac);
 430 #endif
 431
 432         kfree(ac);
 433
 434         return 0;
 435 }
 436
 437 static int __init acpi_ac_init(void)
 438 {
 439         unsigned int i;
 440         int result;
 441
 442         if (acpi_disabled)
 443                 return -ENODEV;
 444
 445         for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++)
 446                 if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1",
 447                                      acpi_ac_blacklist[i].hrv)) {
 448                         pr_info(PREFIX "AC: found native %s PMIC, not loading\n",
 449                                 acpi_ac_blacklist[i].hid);
 450                         return -ENODEV;
 451                 }
 452
 453 #ifdef CONFIG_ACPI_PROCFS_POWER
 454         acpi_ac_dir = acpi_lock_ac_dir();
 455         if (!acpi_ac_dir)
 456                 return -ENODEV;
 457 #endif
 458
 459
 460         result = acpi_bus_register_driver(&acpi_ac_driver);
 461         if (result < 0) {
 462 #ifdef CONFIG_ACPI_PROCFS_POWER
 463                 acpi_unlock_ac_dir(acpi_ac_dir);
 464 #endif
 465                 return -ENODEV;
 466         }
 467
 468         return 0;
 469 }
 470
 471 static void __exit acpi_ac_exit(void)
 472 {
 473         acpi_bus_unregister_driver(&acpi_ac_driver);
 474 #ifdef CONFIG_ACPI_PROCFS_POWER
 475         acpi_unlock_ac_dir(acpi_ac_dir);
 476 #endif
 477 }
 478 module_init(acpi_ac_init);
 479 module_exit(acpi_ac_exit);