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
  37 #define PREFIX "ACPI: "
  38
  39 #define ACPI_AC_CLASS                   "ac_adapter"
  40 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
  41 #define ACPI_AC_FILE_STATE              "state"
  42 #define ACPI_AC_NOTIFY_STATUS           0x80
  43 #define ACPI_AC_STATUS_OFFLINE          0x00
  44 #define ACPI_AC_STATUS_ONLINE           0x01
  45 #define ACPI_AC_STATUS_UNKNOWN          0xFF
  46
  47 #define _COMPONENT              ACPI_AC_COMPONENT
  48 ACPI_MODULE_NAME("ac");
  49
  50 MODULE_AUTHOR("Paul Diefenbaugh");
  51 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
  52 MODULE_LICENSE("GPL");
  53
  54 static int ac_sleep_before_get_state_ms;
  55
  56 struct acpi_ac {
  57         struct power_supply charger;
  58         struct platform_device *pdev;
  59         unsigned long long state;
  60 };
  61
  62 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
  63
  64 /* --------------------------------------------------------------------------
  65                                AC Adapter Management
  66    -------------------------------------------------------------------------- */
  67
  68 static int acpi_ac_get_state(struct acpi_ac *ac)
  69 {
  70         acpi_status status;
  71         acpi_handle handle = ACPI_HANDLE(&ac->pdev->dev);
  72
  73         status = acpi_evaluate_integer(handle, "_PSR", NULL,
  74                                        &ac->state);
  75         if (ACPI_FAILURE(status)) {
  76                 ACPI_EXCEPTION((AE_INFO, status,
  77                                 "Error reading AC Adapter state"));
  78                 ac->state = ACPI_AC_STATUS_UNKNOWN;
  79                 return -ENODEV;
  80         }
  81
  82         return 0;
  83 }
  84
  85 /* --------------------------------------------------------------------------
  86                             sysfs I/F
  87    -------------------------------------------------------------------------- */
  88 static int get_ac_property(struct power_supply *psy,
  89                            enum power_supply_property psp,
  90                            union power_supply_propval *val)
  91 {
  92         struct acpi_ac *ac = to_acpi_ac(psy);
  93
  94         if (!ac)
  95                 return -ENODEV;
  96
  97         if (acpi_ac_get_state(ac))
  98                 return -ENODEV;
  99
 100         switch (psp) {
 101         case POWER_SUPPLY_PROP_ONLINE:
 102                 val->intval = ac->state;
 103                 break;
 104         default:
 105                 return -EINVAL;
 106         }
 107         return 0;
 108 }
 109
 110 static enum power_supply_property ac_props[] = {
 111         POWER_SUPPLY_PROP_ONLINE,
 112 };
 113
 114 /* --------------------------------------------------------------------------
 115                                    Driver Model
 116    -------------------------------------------------------------------------- */
 117
 118 static void acpi_ac_notify_handler(acpi_handle handle, u32 event, void *data)
 119 {
 120         struct acpi_ac *ac = data;
 121         struct acpi_device *adev;
 122
 123         if (!ac)
 124                 return;
 125
 126         switch (event) {
 127         default:
 128                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 129                                   "Unsupported event [0x%x]\n", event));
 130         case ACPI_AC_NOTIFY_STATUS:
 131         case ACPI_NOTIFY_BUS_CHECK:
 132         case ACPI_NOTIFY_DEVICE_CHECK:
 133                 /*
 134                  * A buggy BIOS may notify AC first and then sleep for
 135                  * a specific time before doing actual operations in the
 136                  * EC event handler (_Qxx). This will cause the AC state
 137                  * reported by the ACPI event to be incorrect, so wait for a
 138                  * specific time for the EC event handler to make progress.
 139                  */
 140                 if (ac_sleep_before_get_state_ms > 0)
 141                         msleep(ac_sleep_before_get_state_ms);
 142
 143                 acpi_ac_get_state(ac);
 144                 adev = ACPI_COMPANION(&ac->pdev->dev);
 145                 acpi_bus_generate_netlink_event(adev->pnp.device_class,
 146                                                 dev_name(&ac->pdev->dev),
 147                                                 event, (u32) ac->state);
 148                 acpi_notifier_call_chain(adev, event, (u32) ac->state);
 149                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 150         }
 151
 152         return;
 153 }
 154
 155 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
 156 {
 157         ac_sleep_before_get_state_ms = 1000;
 158         return 0;
 159 }
 160
 161 static struct dmi_system_id ac_dmi_table[] = {
 162         {
 163         .callback = thinkpad_e530_quirk,
 164         .ident = "thinkpad e530",
 165         .matches = {
 166                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 167                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
 168                 },
 169         },
 170         {},
 171 };
 172
 173 static int acpi_ac_probe(struct platform_device *pdev)
 174 {
 175         int result = 0;
 176         struct acpi_ac *ac = NULL;
 177         struct acpi_device *adev;
 178
 179         if (!pdev)
 180                 return -EINVAL;
 181
 182         adev = ACPI_COMPANION(&pdev->dev);
 183         if (!adev)
 184                 return -ENODEV;
 185
 186         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 187         if (!ac)
 188                 return -ENOMEM;
 189
 190         strcpy(acpi_device_name(adev), ACPI_AC_DEVICE_NAME);
 191         strcpy(acpi_device_class(adev), ACPI_AC_CLASS);
 192         ac->pdev = pdev;
 193         platform_set_drvdata(pdev, ac);
 194
 195         result = acpi_ac_get_state(ac);
 196         if (result)
 197                 goto end;
 198
 199         ac->charger.name = acpi_device_bid(adev);
 200         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
 201         ac->charger.properties = ac_props;
 202         ac->charger.num_properties = ARRAY_SIZE(ac_props);
 203         ac->charger.get_property = get_ac_property;
 204         result = power_supply_register(&pdev->dev, &ac->charger);
 205         if (result)
 206                 goto end;
 207
 208         result = acpi_install_notify_handler(ACPI_HANDLE(&pdev->dev),
 209                         ACPI_ALL_NOTIFY, acpi_ac_notify_handler, ac);
 210         if (result) {
 211                 power_supply_unregister(&ac->charger);
 212                 goto end;
 213         }
 214         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 215                acpi_device_name(adev), acpi_device_bid(adev),
 216                ac->state ? "on-line" : "off-line");
 217
 218 end:
 219         if (result)
 220                 kfree(ac);
 221
 222         dmi_check_system(ac_dmi_table);
 223         return result;
 224 }
 225
 226 #ifdef CONFIG_PM_SLEEP
 227 static int acpi_ac_resume(struct device *dev)
 228 {
 229         struct acpi_ac *ac;
 230         unsigned old_state;
 231
 232         if (!dev)
 233                 return -EINVAL;
 234
 235         ac = platform_get_drvdata(to_platform_device(dev));
 236         if (!ac)
 237                 return -EINVAL;
 238
 239         old_state = ac->state;
 240         if (acpi_ac_get_state(ac))
 241                 return 0;
 242         if (old_state != ac->state)
 243                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 244         return 0;
 245 }
 246 #else
 247 #define acpi_ac_resume NULL
 248 #endif
 249 static SIMPLE_DEV_PM_OPS(acpi_ac_pm_ops, NULL, acpi_ac_resume);
 250
 251 static int acpi_ac_remove(struct platform_device *pdev)
 252 {
 253         struct acpi_ac *ac;
 254
 255         if (!pdev)
 256                 return -EINVAL;
 257
 258         acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
 259                         ACPI_ALL_NOTIFY, acpi_ac_notify_handler);
 260
 261         ac = platform_get_drvdata(pdev);
 262         if (ac->charger.dev)
 263                 power_supply_unregister(&ac->charger);
 264
 265         kfree(ac);
 266
 267         return 0;
 268 }
 269
 270 static const struct acpi_device_id acpi_ac_match[] = {
 271         { "ACPI0003", 0 },
 272         { }
 273 };
 274 MODULE_DEVICE_TABLE(acpi, acpi_ac_match);
 275
 276 static struct platform_driver acpi_ac_driver = {
 277         .probe          = acpi_ac_probe,
 278         .remove         = acpi_ac_remove,
 279         .driver         = {
 280                 .name   = "acpi-ac",
 281                 .owner  = THIS_MODULE,
 282                 .pm     = &acpi_ac_pm_ops,
 283                 .acpi_match_table = ACPI_PTR(acpi_ac_match),
 284         },
 285 };
 286
 287 static int __init acpi_ac_init(void)
 288 {
 289         int result;
 290
 291         if (acpi_disabled)
 292                 return -ENODEV;
 293
 294         result = platform_driver_register(&acpi_ac_driver);
 295         if (result < 0)
 296                 return -ENODEV;
 297
 298         return 0;
 299 }
 300
 301 static void __exit acpi_ac_exit(void)
 302 {
 303         platform_driver_unregister(&acpi_ac_driver);
 304 }
 305 module_init(acpi_ac_init);
 306 module_exit(acpi_ac_exit);