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