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/init.h>
  29 #include <linux/types.h>
  30 #ifdef CONFIG_ACPI_PROCFS_POWER
  31 #include <linux/proc_fs.h>
  32 #include <linux/seq_file.h>
  33 #endif
  34 #ifdef CONFIG_ACPI_SYSFS_POWER
  35 #include <linux/power_supply.h>
  36 #endif
  37 #include <acpi/acpi_bus.h>
  38 #include <acpi/acpi_drivers.h>
  39
  40 #define PREFIX "ACPI: "
  41
  42 #define ACPI_AC_CLASS                   "ac_adapter"
  43 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
  44 #define ACPI_AC_FILE_STATE              "state"
  45 #define ACPI_AC_NOTIFY_STATUS           0x80
  46 #define ACPI_AC_STATUS_OFFLINE          0x00
  47 #define ACPI_AC_STATUS_ONLINE           0x01
  48 #define ACPI_AC_STATUS_UNKNOWN          0xFF
  49
  50 #define _COMPONENT              ACPI_AC_COMPONENT
  51 ACPI_MODULE_NAME("ac");
  52
  53 MODULE_AUTHOR("Paul Diefenbaugh");
  54 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
  55 MODULE_LICENSE("GPL");
  56
  57 #ifdef CONFIG_ACPI_PROCFS_POWER
  58 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  59 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  60 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
  61 #endif
  62
  63 static int acpi_ac_add(struct acpi_device *device);
  64 static int acpi_ac_remove(struct acpi_device *device, int type);
  65 static int acpi_ac_resume(struct acpi_device *device);
  66 static void acpi_ac_notify(struct acpi_device *device, u32 event);
  67
  68 static const struct acpi_device_id ac_device_ids[] = {
  69         {"ACPI0003", 0},
  70         {"", 0},
  71 };
  72 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  73
  74 static struct acpi_driver acpi_ac_driver = {
  75         .name = "ac",
  76         .class = ACPI_AC_CLASS,
  77         .ids = ac_device_ids,
  78         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
  79         .ops = {
  80                 .add = acpi_ac_add,
  81                 .remove = acpi_ac_remove,
  82                 .resume = acpi_ac_resume,
  83                 .notify = acpi_ac_notify,
  84                 },
  85 };
  86
  87 struct acpi_ac {
  88 #ifdef CONFIG_ACPI_SYSFS_POWER
  89         struct power_supply charger;
  90 #endif
  91         struct acpi_device * device;
  92         unsigned long long state;
  93 };
  94
  95 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
  96
  97 #ifdef CONFIG_ACPI_PROCFS_POWER
  98 static const struct file_operations acpi_ac_fops = {
  99         .owner = THIS_MODULE,
 100         .open = acpi_ac_open_fs,
 101         .read = seq_read,
 102         .llseek = seq_lseek,
 103         .release = single_release,
 104 };
 105 #endif
 106 #ifdef CONFIG_ACPI_SYSFS_POWER
 107 static int get_ac_property(struct power_supply *psy,
 108                            enum power_supply_property psp,
 109                            union power_supply_propval *val)
 110 {
 111         struct acpi_ac *ac = to_acpi_ac(psy);
 112         switch (psp) {
 113         case POWER_SUPPLY_PROP_ONLINE:
 114                 val->intval = ac->state;
 115                 break;
 116         default:
 117                 return -EINVAL;
 118         }
 119         return 0;
 120 }
 121
 122 static enum power_supply_property ac_props[] = {
 123         POWER_SUPPLY_PROP_ONLINE,
 124 };
 125 #endif
 126 /* --------------------------------------------------------------------------
 127                                AC Adapter Management
 128    -------------------------------------------------------------------------- */
 129
 130 static int acpi_ac_get_state(struct acpi_ac *ac)
 131 {
 132         acpi_status status = AE_OK;
 133
 134
 135         if (!ac)
 136                 return -EINVAL;
 137
 138         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
 139         if (ACPI_FAILURE(status)) {
 140                 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
 141                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 142                 return -ENODEV;
 143         }
 144
 145         return 0;
 146 }
 147
 148 #ifdef CONFIG_ACPI_PROCFS_POWER
 149 /* --------------------------------------------------------------------------
 150                               FS Interface (/proc)
 151    -------------------------------------------------------------------------- */
 152
 153 static struct proc_dir_entry *acpi_ac_dir;
 154
 155 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 156 {
 157         struct acpi_ac *ac = seq->private;
 158
 159
 160         if (!ac)
 161                 return 0;
 162
 163         if (acpi_ac_get_state(ac)) {
 164                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 165                 return 0;
 166         }
 167
 168         seq_puts(seq, "state:                   ");
 169         switch (ac->state) {
 170         case ACPI_AC_STATUS_OFFLINE:
 171                 seq_puts(seq, "off-line\n");
 172                 break;
 173         case ACPI_AC_STATUS_ONLINE:
 174                 seq_puts(seq, "on-line\n");
 175                 break;
 176         default:
 177                 seq_puts(seq, "unknown\n");
 178                 break;
 179         }
 180
 181         return 0;
 182 }
 183
 184 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
 185 {
 186         return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
 187 }
 188
 189 static int acpi_ac_add_fs(struct acpi_device *device)
 190 {
 191         struct proc_dir_entry *entry = NULL;
 192
 193
 194         if (!acpi_device_dir(device)) {
 195                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 196                                                      acpi_ac_dir);
 197                 if (!acpi_device_dir(device))
 198                         return -ENODEV;
 199         }
 200
 201         /* 'state' [R] */
 202         entry = proc_create_data(ACPI_AC_FILE_STATE,
 203                                  S_IRUGO, acpi_device_dir(device),
 204                                  &acpi_ac_fops, acpi_driver_data(device));
 205         if (!entry)
 206                 return -ENODEV;
 207         return 0;
 208 }
 209
 210 static int acpi_ac_remove_fs(struct acpi_device *device)
 211 {
 212
 213         if (acpi_device_dir(device)) {
 214                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
 215
 216                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
 217                 acpi_device_dir(device) = NULL;
 218         }
 219
 220         return 0;
 221 }
 222 #endif
 223
 224 /* --------------------------------------------------------------------------
 225                                    Driver Model
 226    -------------------------------------------------------------------------- */
 227
 228 static void acpi_ac_notify(struct acpi_device *device, u32 event)
 229 {
 230         struct acpi_ac *ac = acpi_driver_data(device);
 231
 232
 233         if (!ac)
 234                 return;
 235
 236         switch (event) {
 237         default:
 238                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 239                                   "Unsupported event [0x%x]\n", event));
 240         case ACPI_AC_NOTIFY_STATUS:
 241         case ACPI_NOTIFY_BUS_CHECK:
 242         case ACPI_NOTIFY_DEVICE_CHECK:
 243                 acpi_ac_get_state(ac);
 244                 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
 245                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 246                                                   dev_name(&device->dev), event,
 247                                                   (u32) ac->state);
 248                 acpi_notifier_call_chain(device, event, (u32) ac->state);
 249 #ifdef CONFIG_ACPI_SYSFS_POWER
 250                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 251 #endif
 252         }
 253
 254         return;
 255 }
 256
 257 static int acpi_ac_add(struct acpi_device *device)
 258 {
 259         int result = 0;
 260         struct acpi_ac *ac = NULL;
 261
 262
 263         if (!device)
 264                 return -EINVAL;
 265
 266         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 267         if (!ac)
 268                 return -ENOMEM;
 269
 270         ac->device = device;
 271         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 272         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 273         device->driver_data = ac;
 274
 275         result = acpi_ac_get_state(ac);
 276         if (result)
 277                 goto end;
 278
 279 #ifdef CONFIG_ACPI_PROCFS_POWER
 280         result = acpi_ac_add_fs(device);
 281 #endif
 282         if (result)
 283                 goto end;
 284 #ifdef CONFIG_ACPI_SYSFS_POWER
 285         ac->charger.name = acpi_device_bid(device);
 286         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
 287         ac->charger.properties = ac_props;
 288         ac->charger.num_properties = ARRAY_SIZE(ac_props);
 289         ac->charger.get_property = get_ac_property;
 290         power_supply_register(&ac->device->dev, &ac->charger);
 291 #endif
 292
 293         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 294                acpi_device_name(device), acpi_device_bid(device),
 295                ac->state ? "on-line" : "off-line");
 296
 297       end:
 298         if (result) {
 299 #ifdef CONFIG_ACPI_PROCFS_POWER
 300                 acpi_ac_remove_fs(device);
 301 #endif
 302                 kfree(ac);
 303         }
 304
 305         return result;
 306 }
 307
 308 static int acpi_ac_resume(struct acpi_device *device)
 309 {
 310         struct acpi_ac *ac;
 311         unsigned old_state;
 312         if (!device || !acpi_driver_data(device))
 313                 return -EINVAL;
 314         ac = acpi_driver_data(device);
 315         old_state = ac->state;
 316         if (acpi_ac_get_state(ac))
 317                 return 0;
 318 #ifdef CONFIG_ACPI_SYSFS_POWER
 319         if (old_state != ac->state)
 320                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 321 #endif
 322         return 0;
 323 }
 324
 325 static int acpi_ac_remove(struct acpi_device *device, int type)
 326 {
 327         struct acpi_ac *ac = NULL;
 328
 329
 330         if (!device || !acpi_driver_data(device))
 331                 return -EINVAL;
 332
 333         ac = acpi_driver_data(device);
 334
 335 #ifdef CONFIG_ACPI_SYSFS_POWER
 336         if (ac->charger.dev)
 337                 power_supply_unregister(&ac->charger);
 338 #endif
 339 #ifdef CONFIG_ACPI_PROCFS_POWER
 340         acpi_ac_remove_fs(device);
 341 #endif
 342
 343         kfree(ac);
 344
 345         return 0;
 346 }
 347
 348 static int __init acpi_ac_init(void)
 349 {
 350         int result;
 351
 352         if (acpi_disabled)
 353                 return -ENODEV;
 354
 355 #ifdef CONFIG_ACPI_PROCFS_POWER
 356         acpi_ac_dir = acpi_lock_ac_dir();
 357         if (!acpi_ac_dir)
 358                 return -ENODEV;
 359 #endif
 360
 361         result = acpi_bus_register_driver(&acpi_ac_driver);
 362         if (result < 0) {
 363 #ifdef CONFIG_ACPI_PROCFS_POWER
 364                 acpi_unlock_ac_dir(acpi_ac_dir);
 365 #endif
 366                 return -ENODEV;
 367         }
 368
 369         return 0;
 370 }
 371
 372 static void __exit acpi_ac_exit(void)
 373 {
 374
 375         acpi_bus_unregister_driver(&acpi_ac_driver);
 376
 377 #ifdef CONFIG_ACPI_PROCFS_POWER
 378         acpi_unlock_ac_dir(acpi_ac_dir);
 379 #endif
 380
 381         return;
 382 }
 383
 384 module_init(acpi_ac_init);
 385 module_exit(acpi_ac_exit);