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