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 <acpi/acpi_bus.h>
  36 #include <acpi/acpi_drivers.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 };
  62
  63 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
  64
  65 /* --------------------------------------------------------------------------
  66                                AC Adapter Management
  67    -------------------------------------------------------------------------- */
  68
  69 static int acpi_ac_get_state(struct acpi_ac *ac)
  70 {
  71         acpi_status status;
  72         acpi_handle handle = ACPI_HANDLE(&ac->pdev->dev);
  73
  74         status = acpi_evaluate_integer(handle, "_PSR", NULL,
  75                                        &ac->state);
  76         if (ACPI_FAILURE(status)) {
  77                 ACPI_EXCEPTION((AE_INFO, status,
  78                                 "Error reading AC Adapter state"));
  79                 ac->state = ACPI_AC_STATUS_UNKNOWN;
  80                 return -ENODEV;
  81         }
  82
  83         return 0;
  84 }
  85
  86 /* --------------------------------------------------------------------------
  87                             sysfs I/F
  88    -------------------------------------------------------------------------- */
  89 static int get_ac_property(struct power_supply *psy,
  90                            enum power_supply_property psp,
  91                            union power_supply_propval *val)
  92 {
  93         struct acpi_ac *ac = to_acpi_ac(psy);
  94
  95         if (!ac)
  96                 return -ENODEV;
  97
  98         if (acpi_ac_get_state(ac))
  99                 return -ENODEV;
 100
 101         switch (psp) {
 102         case POWER_SUPPLY_PROP_ONLINE:
 103                 val->intval = ac->state;
 104                 break;
 105         default:
 106                 return -EINVAL;
 107         }
 108         return 0;
 109 }
 110
 111 static enum power_supply_property ac_props[] = {
 112         POWER_SUPPLY_PROP_ONLINE,
 113 };
 114
 115 /* --------------------------------------------------------------------------
 116                                    Driver Model
 117    -------------------------------------------------------------------------- */
 118
 119 static void acpi_ac_notify_handler(acpi_handle handle, u32 event, void *data)
 120 {
 121         struct acpi_ac *ac = data;
 122         struct acpi_device *adev;
 123
 124         if (!ac)
 125                 return;
 126
 127         switch (event) {
 128         default:
 129                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 130                                   "Unsupported event [0x%x]\n", event));
 131         case ACPI_AC_NOTIFY_STATUS:
 132         case ACPI_NOTIFY_BUS_CHECK:
 133         case ACPI_NOTIFY_DEVICE_CHECK:
 134                 /*
 135                  * A buggy BIOS may notify AC first and then sleep for
 136                  * a specific time before doing actual operations in the
 137                  * EC event handler (_Qxx). This will cause the AC state
 138                  * reported by the ACPI event to be incorrect, so wait for a
 139                  * specific time for the EC event handler to make progress.
 140                  */
 141                 if (ac_sleep_before_get_state_ms > 0)
 142                         msleep(ac_sleep_before_get_state_ms);
 143
 144                 acpi_ac_get_state(ac);
 145                 adev = ACPI_COMPANION(&ac->pdev->dev);
 146                 acpi_bus_generate_netlink_event(adev->pnp.device_class,
 147                                                 dev_name(&ac->pdev->dev),
 148                                                 event, (u32) ac->state);
 149                 acpi_notifier_call_chain(adev, event, (u32) ac->state);
 150                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 151         }
 152
 153         return;
 154 }
 155
 156 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
 157 {
 158         ac_sleep_before_get_state_ms = 1000;
 159         return 0;
 160 }
 161
 162 static struct dmi_system_id ac_dmi_table[] = {
 163         {
 164         .callback = thinkpad_e530_quirk,
 165         .ident = "thinkpad e530",
 166         .matches = {
 167                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 168                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
 169                 },
 170         },
 171         {},
 172 };
 173
 174 static int acpi_ac_probe(struct platform_device *pdev)
 175 {
 176         int result = 0;
 177         struct acpi_ac *ac = NULL;
 178         struct acpi_device *adev;
 179
 180         if (!pdev)
 181                 return -EINVAL;
 182
 183         adev = ACPI_COMPANION(&pdev->dev);
 184         if (!adev)
 185                 return -ENODEV;
 186
 187         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 188         if (!ac)
 189                 return -ENOMEM;
 190
 191         strcpy(acpi_device_name(adev), ACPI_AC_DEVICE_NAME);
 192         strcpy(acpi_device_class(adev), ACPI_AC_CLASS);
 193         ac->pdev = pdev;
 194         platform_set_drvdata(pdev, ac);
 195
 196         result = acpi_ac_get_state(ac);
 197         if (result)
 198                 goto end;
 199
 200         ac->charger.name = acpi_device_bid(adev);
 201         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
 202         ac->charger.properties = ac_props;
 203         ac->charger.num_properties = ARRAY_SIZE(ac_props);
 204         ac->charger.get_property = get_ac_property;
 205         result = power_supply_register(&pdev->dev, &ac->charger);
 206         if (result)
 207                 goto end;
 208
 209         result = acpi_install_notify_handler(ACPI_HANDLE(&pdev->dev),
 210                         ACPI_DEVICE_NOTIFY, acpi_ac_notify_handler, ac);
 211         if (result) {
 212                 power_supply_unregister(&ac->charger);
 213                 goto end;
 214         }
 215         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 216                acpi_device_name(adev), acpi_device_bid(adev),
 217                ac->state ? "on-line" : "off-line");
 218
 219 end:
 220         if (result)
 221                 kfree(ac);
 222
 223         dmi_check_system(ac_dmi_table);
 224         return result;
 225 }
 226
 227 #ifdef CONFIG_PM_SLEEP
 228 static int acpi_ac_resume(struct device *dev)
 229 {
 230         struct acpi_ac *ac;
 231         unsigned old_state;
 232
 233         if (!dev)
 234                 return -EINVAL;
 235
 236         ac = platform_get_drvdata(to_platform_device(dev));
 237         if (!ac)
 238                 return -EINVAL;
 239
 240         old_state = ac->state;
 241         if (acpi_ac_get_state(ac))
 242                 return 0;
 243         if (old_state != ac->state)
 244                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 245         return 0;
 246 }
 247 #endif
 248 static SIMPLE_DEV_PM_OPS(acpi_ac_pm_ops, NULL, acpi_ac_resume);
 249
 250 static int acpi_ac_remove(struct platform_device *pdev)
 251 {
 252         struct acpi_ac *ac;
 253
 254         if (!pdev)
 255                 return -EINVAL;
 256
 257         acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
 258                         ACPI_DEVICE_NOTIFY, acpi_ac_notify_handler);
 259
 260         ac = platform_get_drvdata(pdev);
 261         if (ac->charger.dev)
 262                 power_supply_unregister(&ac->charger);
 263
 264         kfree(ac);
 265
 266         return 0;
 267 }
 268
 269 static const struct acpi_device_id acpi_ac_match[] = {
 270         { "ACPI0003", 0 },
 271         { }
 272 };
 273 MODULE_DEVICE_TABLE(acpi, acpi_ac_match);
 274
 275 static struct platform_driver acpi_ac_driver = {
 276         .probe          = acpi_ac_probe,
 277         .remove         = acpi_ac_remove,
 278         .driver         = {
 279                 .name   = "acpi-ac",
 280                 .owner  = THIS_MODULE,
 281                 .pm     = &acpi_ac_pm_ops,
 282                 .acpi_match_table = ACPI_PTR(acpi_ac_match),
 283         },
 284 };
 285
 286 static int __init acpi_ac_init(void)
 287 {
 288         int result;
 289
 290         if (acpi_disabled)
 291                 return -ENODEV;
 292
 293         result = platform_driver_register(&acpi_ac_driver);
 294         if (result < 0)
 295                 return -ENODEV;
 296
 297         return 0;
 298 }
 299
 300 static void __exit acpi_ac_exit(void)
 301 {
 302         platform_driver_unregister(&acpi_ac_driver);
 303 }
 304 module_init(acpi_ac_init);
 305 module_exit(acpi_ac_exit);