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 #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 static int acpi_ac_add(struct acpi_device *device);
  56 static int acpi_ac_remove(struct acpi_device *device);
  57 static void acpi_ac_notify(struct acpi_device *device, u32 event);
  58
  59 static const struct acpi_device_id ac_device_ids[] = {
  60         {"ACPI0003", 0},
  61         {"", 0},
  62 };
  63 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  64
  65 #ifdef CONFIG_PM_SLEEP
  66 static int acpi_ac_resume(struct device *dev);
  67 #endif
  68 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
  69
  70 static int ac_sleep_before_get_state_ms;
  71
  72 static struct acpi_driver acpi_ac_driver = {
  73         .name = "ac",
  74         .class = ACPI_AC_CLASS,
  75         .ids = ac_device_ids,
  76         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
  77         .ops = {
  78                 .add = acpi_ac_add,
  79                 .remove = acpi_ac_remove,
  80                 .notify = acpi_ac_notify,
  81                 },
  82         .drv.pm = &acpi_ac_pm,
  83 };
  84
  85 struct acpi_ac {
  86         struct power_supply charger;
  87         struct acpi_device * device;
  88         unsigned long long state;
  89         struct notifier_block battery_nb;
  90 };
  91
  92 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
  93
  94 /* --------------------------------------------------------------------------
  95                                AC Adapter Management
  96    -------------------------------------------------------------------------- */
  97
  98 static int acpi_ac_get_state(struct acpi_ac *ac)
  99 {
 100         acpi_status status = AE_OK;
 101
 102         if (!ac)
 103                 return -EINVAL;
 104
 105         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
 106                                        &ac->state);
 107         if (ACPI_FAILURE(status)) {
 108                 ACPI_EXCEPTION((AE_INFO, status,
 109                                 "Error reading AC Adapter state"));
 110                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 111                 return -ENODEV;
 112         }
 113
 114         return 0;
 115 }
 116
 117 /* --------------------------------------------------------------------------
 118                             sysfs I/F
 119    -------------------------------------------------------------------------- */
 120 static int get_ac_property(struct power_supply *psy,
 121                            enum power_supply_property psp,
 122                            union power_supply_propval *val)
 123 {
 124         struct acpi_ac *ac = to_acpi_ac(psy);
 125
 126         if (!ac)
 127                 return -ENODEV;
 128
 129         if (acpi_ac_get_state(ac))
 130                 return -ENODEV;
 131
 132         switch (psp) {
 133         case POWER_SUPPLY_PROP_ONLINE:
 134                 val->intval = ac->state;
 135                 break;
 136         default:
 137                 return -EINVAL;
 138         }
 139         return 0;
 140 }
 141
 142 static enum power_supply_property ac_props[] = {
 143         POWER_SUPPLY_PROP_ONLINE,
 144 };
 145
 146 /* --------------------------------------------------------------------------
 147                                    Driver Model
 148    -------------------------------------------------------------------------- */
 149
 150 static void acpi_ac_notify(struct acpi_device *device, u32 event)
 151 {
 152         struct acpi_ac *ac = acpi_driver_data(device);
 153
 154         if (!ac)
 155                 return;
 156
 157         switch (event) {
 158         default:
 159                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 160                                   "Unsupported event [0x%x]\n", event));
 161         case ACPI_AC_NOTIFY_STATUS:
 162         case ACPI_NOTIFY_BUS_CHECK:
 163         case ACPI_NOTIFY_DEVICE_CHECK:
 164                 /*
 165                  * A buggy BIOS may notify AC first and then sleep for
 166                  * a specific time before doing actual operations in the
 167                  * EC event handler (_Qxx). This will cause the AC state
 168                  * reported by the ACPI event to be incorrect, so wait for a
 169                  * specific time for the EC event handler to make progress.
 170                  */
 171                 if (ac_sleep_before_get_state_ms > 0)
 172                         msleep(ac_sleep_before_get_state_ms);
 173
 174                 acpi_ac_get_state(ac);
 175                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 176                                                   dev_name(&device->dev), event,
 177                                                   (u32) ac->state);
 178                 acpi_notifier_call_chain(device, event, (u32) ac->state);
 179                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 180         }
 181
 182         return;
 183 }
 184
 185 static int acpi_ac_battery_notify(struct notifier_block *nb,
 186                                   unsigned long action, void *data)
 187 {
 188         struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
 189         struct acpi_bus_event *event = (struct acpi_bus_event *)data;
 190
 191         /*
 192          * On HP Pavilion dv6-6179er AC status notifications aren't triggered
 193          * when adapter is plugged/unplugged. However, battery status
 194          * notifcations are triggered when battery starts charging or
 195          * discharging. Re-reading AC status triggers lost AC notifications,
 196          * if AC status has changed.
 197          */
 198         if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
 199             event->type == ACPI_BATTERY_NOTIFY_STATUS)
 200                 acpi_ac_get_state(ac);
 201
 202         return NOTIFY_OK;
 203 }
 204
 205 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
 206 {
 207         ac_sleep_before_get_state_ms = 1000;
 208         return 0;
 209 }
 210
 211 static struct dmi_system_id ac_dmi_table[] = {
 212         {
 213         .callback = thinkpad_e530_quirk,
 214         .ident = "thinkpad e530",
 215         .matches = {
 216                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 217                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
 218                 },
 219         },
 220         {},
 221 };
 222
 223 static int acpi_ac_add(struct acpi_device *device)
 224 {
 225         int result = 0;
 226         struct acpi_ac *ac = NULL;
 227
 228
 229         if (!device)
 230                 return -EINVAL;
 231
 232         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 233         if (!ac)
 234                 return -ENOMEM;
 235
 236         ac->device = device;
 237         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 238         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 239         device->driver_data = ac;
 240
 241         result = acpi_ac_get_state(ac);
 242         if (result)
 243                 goto end;
 244
 245         ac->charger.name = acpi_device_bid(device);
 246         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
 247         ac->charger.properties = ac_props;
 248         ac->charger.num_properties = ARRAY_SIZE(ac_props);
 249         ac->charger.get_property = get_ac_property;
 250         result = power_supply_register(&ac->device->dev, &ac->charger);
 251         if (result)
 252                 goto end;
 253
 254         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 255                acpi_device_name(device), acpi_device_bid(device),
 256                ac->state ? "on-line" : "off-line");
 257
 258         ac->battery_nb.notifier_call = acpi_ac_battery_notify;
 259         register_acpi_notifier(&ac->battery_nb);
 260 end:
 261         if (result)
 262                 kfree(ac);
 263
 264         dmi_check_system(ac_dmi_table);
 265         return result;
 266 }
 267
 268 #ifdef CONFIG_PM_SLEEP
 269 static int acpi_ac_resume(struct device *dev)
 270 {
 271         struct acpi_ac *ac;
 272         unsigned old_state;
 273
 274         if (!dev)
 275                 return -EINVAL;
 276
 277         ac = acpi_driver_data(to_acpi_device(dev));
 278         if (!ac)
 279                 return -EINVAL;
 280
 281         old_state = ac->state;
 282         if (acpi_ac_get_state(ac))
 283                 return 0;
 284         if (old_state != ac->state)
 285                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 286         return 0;
 287 }
 288 #else
 289 #define acpi_ac_resume NULL
 290 #endif
 291
 292 static int acpi_ac_remove(struct acpi_device *device)
 293 {
 294         struct acpi_ac *ac = NULL;
 295
 296
 297         if (!device || !acpi_driver_data(device))
 298                 return -EINVAL;
 299
 300         ac = acpi_driver_data(device);
 301
 302         if (ac->charger.dev)
 303                 power_supply_unregister(&ac->charger);
 304         unregister_acpi_notifier(&ac->battery_nb);
 305
 306         kfree(ac);
 307
 308         return 0;
 309 }
 310
 311 static int __init acpi_ac_init(void)
 312 {
 313         int result;
 314
 315         if (acpi_disabled)
 316                 return -ENODEV;
 317
 318         result = acpi_bus_register_driver(&acpi_ac_driver);
 319         if (result < 0)
 320                 return -ENODEV;
 321
 322         return 0;
 323 }
 324
 325 static void __exit acpi_ac_exit(void)
 326 {
 327         acpi_bus_unregister_driver(&acpi_ac_driver);
 328 }
 329 module_init(acpi_ac_init);
 330 module_exit(acpi_ac_exit);