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 static int get_ac_property(struct power_supply *psy,
 104                            enum power_supply_property psp,
 105                            union power_supply_propval *val)
 106 {
 107         struct acpi_ac *ac = to_acpi_ac(psy);
 108         switch (psp) {
 109         case POWER_SUPPLY_PROP_ONLINE:
 110                 val->intval = ac->state;
 111                 break;
 112         default:
 113                 return -EINVAL;
 114         }
 115         return 0;
 116 }
 117
 118 static enum power_supply_property ac_props[] = {
 119         POWER_SUPPLY_PROP_ONLINE,
 120 };
 121 /* --------------------------------------------------------------------------
 122                                AC Adapter Management
 123    -------------------------------------------------------------------------- */
 124
 125 static int acpi_ac_get_state(struct acpi_ac *ac)
 126 {
 127         acpi_status status = AE_OK;
 128
 129
 130         if (!ac)
 131                 return -EINVAL;
 132
 133         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
 134         if (ACPI_FAILURE(status)) {
 135                 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
 136                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 137                 return -ENODEV;
 138         }
 139
 140         return 0;
 141 }
 142
 143 #ifdef CONFIG_ACPI_PROCFS_POWER
 144 /* --------------------------------------------------------------------------
 145                               FS Interface (/proc)
 146    -------------------------------------------------------------------------- */
 147
 148 static struct proc_dir_entry *acpi_ac_dir;
 149
 150 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 151 {
 152         struct acpi_ac *ac = seq->private;
 153
 154
 155         if (!ac)
 156                 return 0;
 157
 158         if (acpi_ac_get_state(ac)) {
 159                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 160                 return 0;
 161         }
 162
 163         seq_puts(seq, "state:                   ");
 164         switch (ac->state) {
 165         case ACPI_AC_STATUS_OFFLINE:
 166                 seq_puts(seq, "off-line\n");
 167                 break;
 168         case ACPI_AC_STATUS_ONLINE:
 169                 seq_puts(seq, "on-line\n");
 170                 break;
 171         default:
 172                 seq_puts(seq, "unknown\n");
 173                 break;
 174         }
 175
 176         return 0;
 177 }
 178
 179 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
 180 {
 181         return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
 182 }
 183
 184 static int acpi_ac_add_fs(struct acpi_device *device)
 185 {
 186         struct proc_dir_entry *entry = NULL;
 187
 188
 189         if (!acpi_device_dir(device)) {
 190                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 191                                                      acpi_ac_dir);
 192                 if (!acpi_device_dir(device))
 193                         return -ENODEV;
 194         }
 195
 196         /* 'state' [R] */
 197         entry = proc_create_data(ACPI_AC_FILE_STATE,
 198                                  S_IRUGO, acpi_device_dir(device),
 199                                  &acpi_ac_fops, acpi_driver_data(device));
 200         if (!entry)
 201                 return -ENODEV;
 202         return 0;
 203 }
 204
 205 static int acpi_ac_remove_fs(struct acpi_device *device)
 206 {
 207
 208         if (acpi_device_dir(device)) {
 209                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
 210
 211                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
 212                 acpi_device_dir(device) = NULL;
 213         }
 214
 215         return 0;
 216 }
 217 #endif
 218
 219 /* --------------------------------------------------------------------------
 220                                    Driver Model
 221    -------------------------------------------------------------------------- */
 222
 223 static void acpi_ac_notify(struct acpi_device *device, u32 event)
 224 {
 225         struct acpi_ac *ac = acpi_driver_data(device);
 226
 227
 228         if (!ac)
 229                 return;
 230
 231         switch (event) {
 232         default:
 233                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 234                                   "Unsupported event [0x%x]\n", event));
 235         case ACPI_AC_NOTIFY_STATUS:
 236         case ACPI_NOTIFY_BUS_CHECK:
 237         case ACPI_NOTIFY_DEVICE_CHECK:
 238                 acpi_ac_get_state(ac);
 239                 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
 240                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 241                                                   dev_name(&device->dev), event,
 242                                                   (u32) ac->state);
 243                 acpi_notifier_call_chain(device, event, (u32) ac->state);
 244                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 245         }
 246
 247         return;
 248 }
 249
 250 static int acpi_ac_add(struct acpi_device *device)
 251 {
 252         int result = 0;
 253         struct acpi_ac *ac = NULL;
 254
 255
 256         if (!device)
 257                 return -EINVAL;
 258
 259         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 260         if (!ac)
 261                 return -ENOMEM;
 262
 263         ac->device = device;
 264         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 265         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 266         device->driver_data = ac;
 267
 268         result = acpi_ac_get_state(ac);
 269         if (result)
 270                 goto end;
 271
 272 #ifdef CONFIG_ACPI_PROCFS_POWER
 273         result = acpi_ac_add_fs(device);
 274 #endif
 275         if (result)
 276                 goto end;
 277         ac->charger.name = acpi_device_bid(device);
 278         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
 279         ac->charger.properties = ac_props;
 280         ac->charger.num_properties = ARRAY_SIZE(ac_props);
 281         ac->charger.get_property = get_ac_property;
 282         power_supply_register(&ac->device->dev, &ac->charger);
 283
 284         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 285                acpi_device_name(device), acpi_device_bid(device),
 286                ac->state ? "on-line" : "off-line");
 287
 288       end:
 289         if (result) {
 290 #ifdef CONFIG_ACPI_PROCFS_POWER
 291                 acpi_ac_remove_fs(device);
 292 #endif
 293                 kfree(ac);
 294         }
 295
 296         return result;
 297 }
 298
 299 static int acpi_ac_resume(struct acpi_device *device)
 300 {
 301         struct acpi_ac *ac;
 302         unsigned old_state;
 303         if (!device || !acpi_driver_data(device))
 304                 return -EINVAL;
 305         ac = acpi_driver_data(device);
 306         old_state = ac->state;
 307         if (acpi_ac_get_state(ac))
 308                 return 0;
 309         if (old_state != ac->state)
 310                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 311         return 0;
 312 }
 313
 314 static int acpi_ac_remove(struct acpi_device *device, int type)
 315 {
 316         struct acpi_ac *ac = NULL;
 317
 318
 319         if (!device || !acpi_driver_data(device))
 320                 return -EINVAL;
 321
 322         ac = acpi_driver_data(device);
 323
 324         if (ac->charger.dev)
 325                 power_supply_unregister(&ac->charger);
 326 #ifdef CONFIG_ACPI_PROCFS_POWER
 327         acpi_ac_remove_fs(device);
 328 #endif
 329
 330         kfree(ac);
 331
 332         return 0;
 333 }
 334
 335 static int __init acpi_ac_init(void)
 336 {
 337         int result;
 338
 339         if (acpi_disabled)
 340                 return -ENODEV;
 341
 342 #ifdef CONFIG_ACPI_PROCFS_POWER
 343         acpi_ac_dir = acpi_lock_ac_dir();
 344         if (!acpi_ac_dir)
 345                 return -ENODEV;
 346 #endif
 347
 348         result = acpi_bus_register_driver(&acpi_ac_driver);
 349         if (result < 0) {
 350 #ifdef CONFIG_ACPI_PROCFS_POWER
 351                 acpi_unlock_ac_dir(acpi_ac_dir);
 352 #endif
 353                 return -ENODEV;
 354         }
 355
 356         return 0;
 357 }
 358
 359 static void __exit acpi_ac_exit(void)
 360 {
 361
 362         acpi_bus_unregister_driver(&acpi_ac_driver);
 363
 364 #ifdef CONFIG_ACPI_PROCFS_POWER
 365         acpi_unlock_ac_dir(acpi_ac_dir);
 366 #endif
 367
 368         return;
 369 }
 370
 371 module_init(acpi_ac_init);
 372 module_exit(acpi_ac_exit);