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