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