linux/drivers/acpi/ac.c
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   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#ifdef CONFIG_ACPI_PROCFS_POWER
  32#include <linux/proc_fs.h>
  33#include <linux/seq_file.h>
  34#endif
  35#include <linux/power_supply.h>
  36#include <acpi/acpi_bus.h>
  37#include <acpi/acpi_drivers.h>
  38
  39#define PREFIX "ACPI: "
  40
  41#define ACPI_AC_CLASS                   "ac_adapter"
  42#define ACPI_AC_DEVICE_NAME             "AC Adapter"
  43#define ACPI_AC_FILE_STATE              "state"
  44#define ACPI_AC_NOTIFY_STATUS           0x80
  45#define ACPI_AC_STATUS_OFFLINE          0x00
  46#define ACPI_AC_STATUS_ONLINE           0x01
  47#define ACPI_AC_STATUS_UNKNOWN          0xFF
  48
  49#define _COMPONENT              ACPI_AC_COMPONENT
  50ACPI_MODULE_NAME("ac");
  51
  52MODULE_AUTHOR("Paul Diefenbaugh");
  53MODULE_DESCRIPTION("ACPI AC Adapter Driver");
  54MODULE_LICENSE("GPL");
  55
  56#ifdef CONFIG_ACPI_PROCFS_POWER
  57extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  58extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  59static int acpi_ac_open_fs(struct inode *inode, struct file *file);
  60#endif
  61
  62static int acpi_ac_add(struct acpi_device *device);
  63static int acpi_ac_remove(struct acpi_device *device, int type);
  64static void acpi_ac_notify(struct acpi_device *device, u32 event);
  65
  66static const struct acpi_device_id ac_device_ids[] = {
  67        {"ACPI0003", 0},
  68        {"", 0},
  69};
  70MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  71
  72#ifdef CONFIG_PM_SLEEP
  73static int acpi_ac_resume(struct device *dev);
  74#endif
  75static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
  76
  77static struct acpi_driver acpi_ac_driver = {
  78        .name = "ac",
  79        .class = ACPI_AC_CLASS,
  80        .ids = ac_device_ids,
  81        .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
  82        .ops = {
  83                .add = acpi_ac_add,
  84                .remove = acpi_ac_remove,
  85                .notify = acpi_ac_notify,
  86                },
  87        .drv.pm = &acpi_ac_pm,
  88};
  89
  90struct acpi_ac {
  91        struct power_supply charger;
  92        struct acpi_device * device;
  93        unsigned long long state;
  94};
  95
  96#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
  97
  98#ifdef CONFIG_ACPI_PROCFS_POWER
  99static const struct file_operations acpi_ac_fops = {
 100        .owner = THIS_MODULE,
 101        .open = acpi_ac_open_fs,
 102        .read = seq_read,
 103        .llseek = seq_lseek,
 104        .release = single_release,
 105};
 106#endif
 107
 108/* --------------------------------------------------------------------------
 109                               AC Adapter Management
 110   -------------------------------------------------------------------------- */
 111
 112static int acpi_ac_get_state(struct acpi_ac *ac)
 113{
 114        acpi_status status = AE_OK;
 115
 116
 117        if (!ac)
 118                return -EINVAL;
 119
 120        status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
 121        if (ACPI_FAILURE(status)) {
 122                ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
 123                ac->state = ACPI_AC_STATUS_UNKNOWN;
 124                return -ENODEV;
 125        }
 126
 127        return 0;
 128}
 129
 130/* --------------------------------------------------------------------------
 131                            sysfs I/F
 132   -------------------------------------------------------------------------- */
 133static int get_ac_property(struct power_supply *psy,
 134                           enum power_supply_property psp,
 135                           union power_supply_propval *val)
 136{
 137        struct acpi_ac *ac = to_acpi_ac(psy);
 138
 139        if (!ac)
 140                return -ENODEV;
 141
 142        if (acpi_ac_get_state(ac))
 143                return -ENODEV;
 144
 145        switch (psp) {
 146        case POWER_SUPPLY_PROP_ONLINE:
 147                val->intval = ac->state;
 148                break;
 149        default:
 150                return -EINVAL;
 151        }
 152        return 0;
 153}
 154
 155static enum power_supply_property ac_props[] = {
 156        POWER_SUPPLY_PROP_ONLINE,
 157};
 158
 159#ifdef CONFIG_ACPI_PROCFS_POWER
 160/* --------------------------------------------------------------------------
 161                              FS Interface (/proc)
 162   -------------------------------------------------------------------------- */
 163
 164static struct proc_dir_entry *acpi_ac_dir;
 165
 166static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 167{
 168        struct acpi_ac *ac = seq->private;
 169
 170
 171        if (!ac)
 172                return 0;
 173
 174        if (acpi_ac_get_state(ac)) {
 175                seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 176                return 0;
 177        }
 178
 179        seq_puts(seq, "state:                   ");
 180        switch (ac->state) {
 181        case ACPI_AC_STATUS_OFFLINE:
 182                seq_puts(seq, "off-line\n");
 183                break;
 184        case ACPI_AC_STATUS_ONLINE:
 185                seq_puts(seq, "on-line\n");
 186                break;
 187        default:
 188                seq_puts(seq, "unknown\n");
 189                break;
 190        }
 191
 192        return 0;
 193}
 194
 195static int acpi_ac_open_fs(struct inode *inode, struct file *file)
 196{
 197        return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
 198}
 199
 200static int acpi_ac_add_fs(struct acpi_device *device)
 201{
 202        struct proc_dir_entry *entry = NULL;
 203
 204        printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
 205                        " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 206        if (!acpi_device_dir(device)) {
 207                acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 208                                                     acpi_ac_dir);
 209                if (!acpi_device_dir(device))
 210                        return -ENODEV;
 211        }
 212
 213        /* 'state' [R] */
 214        entry = proc_create_data(ACPI_AC_FILE_STATE,
 215                                 S_IRUGO, acpi_device_dir(device),
 216                                 &acpi_ac_fops, acpi_driver_data(device));
 217        if (!entry)
 218                return -ENODEV;
 219        return 0;
 220}
 221
 222static int acpi_ac_remove_fs(struct acpi_device *device)
 223{
 224
 225        if (acpi_device_dir(device)) {
 226                remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
 227
 228                remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
 229                acpi_device_dir(device) = NULL;
 230        }
 231
 232        return 0;
 233}
 234#endif
 235
 236/* --------------------------------------------------------------------------
 237                                   Driver Model
 238   -------------------------------------------------------------------------- */
 239
 240static void acpi_ac_notify(struct acpi_device *device, u32 event)
 241{
 242        struct acpi_ac *ac = acpi_driver_data(device);
 243
 244
 245        if (!ac)
 246                return;
 247
 248        switch (event) {
 249        default:
 250                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 251                                  "Unsupported event [0x%x]\n", event));
 252        case ACPI_AC_NOTIFY_STATUS:
 253        case ACPI_NOTIFY_BUS_CHECK:
 254        case ACPI_NOTIFY_DEVICE_CHECK:
 255                acpi_ac_get_state(ac);
 256                acpi_bus_generate_proc_event(device, event, (u32) ac->state);
 257                acpi_bus_generate_netlink_event(device->pnp.device_class,
 258                                                  dev_name(&device->dev), event,
 259                                                  (u32) ac->state);
 260                acpi_notifier_call_chain(device, event, (u32) ac->state);
 261                kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 262        }
 263
 264        return;
 265}
 266
 267static int acpi_ac_add(struct acpi_device *device)
 268{
 269        int result = 0;
 270        struct acpi_ac *ac = NULL;
 271
 272
 273        if (!device)
 274                return -EINVAL;
 275
 276        ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 277        if (!ac)
 278                return -ENOMEM;
 279
 280        ac->device = device;
 281        strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 282        strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 283        device->driver_data = ac;
 284
 285        result = acpi_ac_get_state(ac);
 286        if (result)
 287                goto end;
 288
 289#ifdef CONFIG_ACPI_PROCFS_POWER
 290        result = acpi_ac_add_fs(device);
 291#endif
 292        if (result)
 293                goto end;
 294        ac->charger.name = acpi_device_bid(device);
 295        ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
 296        ac->charger.properties = ac_props;
 297        ac->charger.num_properties = ARRAY_SIZE(ac_props);
 298        ac->charger.get_property = get_ac_property;
 299        result = power_supply_register(&ac->device->dev, &ac->charger);
 300        if (result)
 301                goto end;
 302
 303        printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 304               acpi_device_name(device), acpi_device_bid(device),
 305               ac->state ? "on-line" : "off-line");
 306
 307      end:
 308        if (result) {
 309#ifdef CONFIG_ACPI_PROCFS_POWER
 310                acpi_ac_remove_fs(device);
 311#endif
 312                kfree(ac);
 313        }
 314
 315        return result;
 316}
 317
 318#ifdef CONFIG_PM_SLEEP
 319static int acpi_ac_resume(struct device *dev)
 320{
 321        struct acpi_ac *ac;
 322        unsigned old_state;
 323
 324        if (!dev)
 325                return -EINVAL;
 326
 327        ac = acpi_driver_data(to_acpi_device(dev));
 328        if (!ac)
 329                return -EINVAL;
 330
 331        old_state = ac->state;
 332        if (acpi_ac_get_state(ac))
 333                return 0;
 334        if (old_state != ac->state)
 335                kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 336        return 0;
 337}
 338#endif
 339
 340static int acpi_ac_remove(struct acpi_device *device, int type)
 341{
 342        struct acpi_ac *ac = NULL;
 343
 344
 345        if (!device || !acpi_driver_data(device))
 346                return -EINVAL;
 347
 348        ac = acpi_driver_data(device);
 349
 350        if (ac->charger.dev)
 351                power_supply_unregister(&ac->charger);
 352#ifdef CONFIG_ACPI_PROCFS_POWER
 353        acpi_ac_remove_fs(device);
 354#endif
 355
 356        kfree(ac);
 357
 358        return 0;
 359}
 360
 361static int __init acpi_ac_init(void)
 362{
 363        int result;
 364
 365        if (acpi_disabled)
 366                return -ENODEV;
 367
 368#ifdef CONFIG_ACPI_PROCFS_POWER
 369        acpi_ac_dir = acpi_lock_ac_dir();
 370        if (!acpi_ac_dir)
 371                return -ENODEV;
 372#endif
 373
 374        result = acpi_bus_register_driver(&acpi_ac_driver);
 375        if (result < 0) {
 376#ifdef CONFIG_ACPI_PROCFS_POWER
 377                acpi_unlock_ac_dir(acpi_ac_dir);
 378#endif
 379                return -ENODEV;
 380        }
 381
 382        return 0;
 383}
 384
 385static void __exit acpi_ac_exit(void)
 386{
 387
 388        acpi_bus_unregister_driver(&acpi_ac_driver);
 389
 390#ifdef CONFIG_ACPI_PROCFS_POWER
 391        acpi_unlock_ac_dir(acpi_ac_dir);
 392#endif
 393
 394        return;
 395}
 396
 397module_init(acpi_ac_init);
 398module_exit(acpi_ac_exit);
 399
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