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 #include <linux/proc_fs.h>
  31 #include <linux/seq_file.h>
  32 #include <linux/power_supply.h>
  33 #include <acpi/acpi_bus.h>
  34 #include <acpi/acpi_drivers.h>
  35
  36 #define ACPI_AC_COMPONENT               0x00020000
  37 #define ACPI_AC_CLASS                   "ac_adapter"
  38 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
  39 #define ACPI_AC_FILE_STATE              "state"
  40 #define ACPI_AC_NOTIFY_STATUS           0x80
  41 #define ACPI_AC_STATUS_OFFLINE          0x00
  42 #define ACPI_AC_STATUS_ONLINE           0x01
  43 #define ACPI_AC_STATUS_UNKNOWN          0xFF
  44
  45 #define _COMPONENT              ACPI_AC_COMPONENT
  46 ACPI_MODULE_NAME("ac");
  47
  48 MODULE_AUTHOR("Paul Diefenbaugh");
  49 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
  50 MODULE_LICENSE("GPL");
  51
  52 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  53 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  54
  55 static int acpi_ac_add(struct acpi_device *device);
  56 static int acpi_ac_remove(struct acpi_device *device, int type);
  57 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
  58
  59 const static struct acpi_device_id ac_device_ids[] = {
  60         {"ACPI0003", 0},
  61         {"", 0},
  62 };
  63 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  64
  65 static struct acpi_driver acpi_ac_driver = {
  66         .name = "ac",
  67         .class = ACPI_AC_CLASS,
  68         .ids = ac_device_ids,
  69         .ops = {
  70                 .add = acpi_ac_add,
  71                 .remove = acpi_ac_remove,
  72                 },
  73 };
  74
  75 struct acpi_ac {
  76         struct power_supply charger;
  77         struct acpi_device * device;
  78         unsigned long state;
  79 };
  80
  81 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
  82
  83 static const struct file_operations acpi_ac_fops = {
  84         .open = acpi_ac_open_fs,
  85         .read = seq_read,
  86         .llseek = seq_lseek,
  87         .release = single_release,
  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         switch (psp) {
  95         case POWER_SUPPLY_PROP_ONLINE:
  96                 val->intval = ac->state;
  97                 break;
  98         default:
  99                 return -EINVAL;
 100         }
 101         return 0;
 102 }
 103
 104 static enum power_supply_property ac_props[] = {
 105         POWER_SUPPLY_PROP_ONLINE,
 106 };
 107
 108 /* --------------------------------------------------------------------------
 109                                AC Adapter Management
 110    -------------------------------------------------------------------------- */
 111
 112 static int acpi_ac_get_state(struct acpi_ac *ac)
 113 {
 114         acpi_status status = AE_OK;
 115
 116
 117         if (!ac)
 118                 return -EINVAL;
 119
 120         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
 121         if (ACPI_FAILURE(status)) {
 122                 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
 123                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 124                 return -ENODEV;
 125         }
 126
 127         return 0;
 128 }
 129
 130 /* --------------------------------------------------------------------------
 131                               FS Interface (/proc)
 132    -------------------------------------------------------------------------- */
 133
 134 static struct proc_dir_entry *acpi_ac_dir;
 135
 136 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 137 {
 138         struct acpi_ac *ac = seq->private;
 139
 140
 141         if (!ac)
 142                 return 0;
 143
 144         if (acpi_ac_get_state(ac)) {
 145                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 146                 return 0;
 147         }
 148
 149         seq_puts(seq, "state:                   ");
 150         switch (ac->state) {
 151         case ACPI_AC_STATUS_OFFLINE:
 152                 seq_puts(seq, "off-line\n");
 153                 break;
 154         case ACPI_AC_STATUS_ONLINE:
 155                 seq_puts(seq, "on-line\n");
 156                 break;
 157         default:
 158                 seq_puts(seq, "unknown\n");
 159                 break;
 160         }
 161
 162         return 0;
 163 }
 164
 165 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
 166 {
 167         return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
 168 }
 169
 170 static int acpi_ac_add_fs(struct acpi_device *device)
 171 {
 172         struct proc_dir_entry *entry = NULL;
 173
 174
 175         if (!acpi_device_dir(device)) {
 176                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 177                                                      acpi_ac_dir);
 178                 if (!acpi_device_dir(device))
 179                         return -ENODEV;
 180                 acpi_device_dir(device)->owner = THIS_MODULE;
 181         }
 182
 183         /* 'state' [R] */
 184         entry = create_proc_entry(ACPI_AC_FILE_STATE,
 185                                   S_IRUGO, acpi_device_dir(device));
 186         if (!entry)
 187                 return -ENODEV;
 188         else {
 189                 entry->proc_fops = &acpi_ac_fops;
 190                 entry->data = acpi_driver_data(device);
 191                 entry->owner = THIS_MODULE;
 192         }
 193
 194         return 0;
 195 }
 196
 197 static int acpi_ac_remove_fs(struct acpi_device *device)
 198 {
 199
 200         if (acpi_device_dir(device)) {
 201                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
 202
 203                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
 204                 acpi_device_dir(device) = NULL;
 205         }
 206
 207         return 0;
 208 }
 209
 210 /* --------------------------------------------------------------------------
 211                                    Driver Model
 212    -------------------------------------------------------------------------- */
 213
 214 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
 215 {
 216         struct acpi_ac *ac = data;
 217         struct acpi_device *device = NULL;
 218
 219
 220         if (!ac)
 221                 return;
 222
 223         device = ac->device;
 224         switch (event) {
 225         case ACPI_AC_NOTIFY_STATUS:
 226         case ACPI_NOTIFY_BUS_CHECK:
 227         case ACPI_NOTIFY_DEVICE_CHECK:
 228                 acpi_ac_get_state(ac);
 229                 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
 230                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 231                                                   device->dev.bus_id, event,
 232                                                   (u32) ac->state);
 233                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 234                 break;
 235         default:
 236                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 237                                   "Unsupported event [0x%x]\n", event));
 238                 break;
 239         }
 240
 241         return;
 242 }
 243
 244 static int acpi_ac_add(struct acpi_device *device)
 245 {
 246         int result = 0;
 247         acpi_status status = AE_OK;
 248         struct acpi_ac *ac = NULL;
 249
 250
 251         if (!device)
 252                 return -EINVAL;
 253
 254         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 255         if (!ac)
 256                 return -ENOMEM;
 257
 258         ac->device = device;
 259         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 260         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 261         acpi_driver_data(device) = ac;
 262
 263         result = acpi_ac_get_state(ac);
 264         if (result)
 265                 goto end;
 266
 267         result = acpi_ac_add_fs(device);
 268         if (result)
 269                 goto end;
 270         ac->charger.name = acpi_device_bid(device);
 271         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
 272         ac->charger.properties = ac_props;
 273         ac->charger.num_properties = ARRAY_SIZE(ac_props);
 274         ac->charger.get_property = get_ac_property;
 275         power_supply_register(&ac->device->dev, &ac->charger);
 276         status = acpi_install_notify_handler(device->handle,
 277                                              ACPI_ALL_NOTIFY, acpi_ac_notify,
 278                                              ac);
 279         if (ACPI_FAILURE(status)) {
 280                 result = -ENODEV;
 281                 goto end;
 282         }
 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                 acpi_ac_remove_fs(device);
 291                 kfree(ac);
 292         }
 293
 294         return result;
 295 }
 296
 297 static int acpi_ac_remove(struct acpi_device *device, int type)
 298 {
 299         acpi_status status = AE_OK;
 300         struct acpi_ac *ac = NULL;
 301
 302
 303         if (!device || !acpi_driver_data(device))
 304                 return -EINVAL;
 305
 306         ac = acpi_driver_data(device);
 307
 308         status = acpi_remove_notify_handler(device->handle,
 309                                             ACPI_ALL_NOTIFY, acpi_ac_notify);
 310         if (ac->charger.dev)
 311                 power_supply_unregister(&ac->charger);
 312         acpi_ac_remove_fs(device);
 313
 314         kfree(ac);
 315
 316         return 0;
 317 }
 318
 319 static int __init acpi_ac_init(void)
 320 {
 321         int result;
 322
 323         if (acpi_disabled)
 324                 return -ENODEV;
 325
 326         acpi_ac_dir = acpi_lock_ac_dir();
 327         if (!acpi_ac_dir)
 328                 return -ENODEV;
 329
 330         result = acpi_bus_register_driver(&acpi_ac_driver);
 331         if (result < 0) {
 332                 acpi_unlock_ac_dir(acpi_ac_dir);
 333                 return -ENODEV;
 334         }
 335
 336         return 0;
 337 }
 338
 339 static void __exit acpi_ac_exit(void)
 340 {
 341
 342         acpi_bus_unregister_driver(&acpi_ac_driver);
 343
 344         acpi_unlock_ac_dir(acpi_ac_dir);
 345
 346         return;
 347 }
 348
 349 module_init(acpi_ac_init);
 350 module_exit(acpi_ac_exit);