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 #ifdef CONFIG_ACPI_PROCFS_POWER
  34 #include <linux/proc_fs.h>
  35 #include <linux/seq_file.h>
  36 #endif
  37 #include <linux/power_supply.h>
  38 #include <acpi/acpi_bus.h>
  39 #include <acpi/acpi_drivers.h>
  40
  41 #define PREFIX "ACPI: "
  42
  43 #define ACPI_AC_CLASS                   "ac_adapter"
  44 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
  45 #define ACPI_AC_FILE_STATE              "state"
  46 #define ACPI_AC_NOTIFY_STATUS           0x80
  47 #define ACPI_AC_STATUS_OFFLINE          0x00
  48 #define ACPI_AC_STATUS_ONLINE           0x01
  49 #define ACPI_AC_STATUS_UNKNOWN          0xFF
  50
  51 #define _COMPONENT              ACPI_AC_COMPONENT
  52 ACPI_MODULE_NAME("ac");
  53
  54 MODULE_AUTHOR("Paul Diefenbaugh");
  55 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
  56 MODULE_LICENSE("GPL");
  57
  58 #ifdef CONFIG_ACPI_PROCFS_POWER
  59 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  60 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  61 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
  62 #endif
  63
  64 static int acpi_ac_add(struct acpi_device *device);
  65 static int acpi_ac_remove(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 #ifdef CONFIG_PM_SLEEP
  75 static int acpi_ac_resume(struct device *dev);
  76 #endif
  77 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
  78
  79 static int ac_sleep_before_get_state_ms;
  80
  81 static struct acpi_driver acpi_ac_driver = {
  82         .name = "ac",
  83         .class = ACPI_AC_CLASS,
  84         .ids = ac_device_ids,
  85         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
  86         .ops = {
  87                 .add = acpi_ac_add,
  88                 .remove = acpi_ac_remove,
  89                 .notify = acpi_ac_notify,
  90                 },
  91         .drv.pm = &acpi_ac_pm,
  92 };
  93
  94 struct acpi_ac {
  95         struct power_supply charger;
  96         struct acpi_device * device;
  97         unsigned long long state;
  98 };
  99
 100 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
 101
 102 #ifdef CONFIG_ACPI_PROCFS_POWER
 103 static const struct file_operations acpi_ac_fops = {
 104         .owner = THIS_MODULE,
 105         .open = acpi_ac_open_fs,
 106         .read = seq_read,
 107         .llseek = seq_lseek,
 108         .release = single_release,
 109 };
 110 #endif
 111
 112 /* --------------------------------------------------------------------------
 113                                AC Adapter Management
 114    -------------------------------------------------------------------------- */
 115
 116 static int acpi_ac_get_state(struct acpi_ac *ac)
 117 {
 118         acpi_status status = AE_OK;
 119
 120
 121         if (!ac)
 122                 return -EINVAL;
 123
 124         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
 125         if (ACPI_FAILURE(status)) {
 126                 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
 127                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 128                 return -ENODEV;
 129         }
 130
 131         return 0;
 132 }
 133
 134 /* --------------------------------------------------------------------------
 135                             sysfs I/F
 136    -------------------------------------------------------------------------- */
 137 static int get_ac_property(struct power_supply *psy,
 138                            enum power_supply_property psp,
 139                            union power_supply_propval *val)
 140 {
 141         struct acpi_ac *ac = to_acpi_ac(psy);
 142
 143         if (!ac)
 144                 return -ENODEV;
 145
 146         if (acpi_ac_get_state(ac))
 147                 return -ENODEV;
 148
 149         switch (psp) {
 150         case POWER_SUPPLY_PROP_ONLINE:
 151                 val->intval = ac->state;
 152                 break;
 153         default:
 154                 return -EINVAL;
 155         }
 156         return 0;
 157 }
 158
 159 static enum power_supply_property ac_props[] = {
 160         POWER_SUPPLY_PROP_ONLINE,
 161 };
 162
 163 #ifdef CONFIG_ACPI_PROCFS_POWER
 164 /* --------------------------------------------------------------------------
 165                               FS Interface (/proc)
 166    -------------------------------------------------------------------------- */
 167
 168 static struct proc_dir_entry *acpi_ac_dir;
 169
 170 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 171 {
 172         struct acpi_ac *ac = seq->private;
 173
 174
 175         if (!ac)
 176                 return 0;
 177
 178         if (acpi_ac_get_state(ac)) {
 179                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 180                 return 0;
 181         }
 182
 183         seq_puts(seq, "state:                   ");
 184         switch (ac->state) {
 185         case ACPI_AC_STATUS_OFFLINE:
 186                 seq_puts(seq, "off-line\n");
 187                 break;
 188         case ACPI_AC_STATUS_ONLINE:
 189                 seq_puts(seq, "on-line\n");
 190                 break;
 191         default:
 192                 seq_puts(seq, "unknown\n");
 193                 break;
 194         }
 195
 196         return 0;
 197 }
 198
 199 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
 200 {
 201         return single_open(file, acpi_ac_seq_show, PDE_DATA(inode));
 202 }
 203
 204 static int acpi_ac_add_fs(struct acpi_device *device)
 205 {
 206         struct proc_dir_entry *entry = NULL;
 207
 208         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
 209                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 210         if (!acpi_device_dir(device)) {
 211                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 212                                                      acpi_ac_dir);
 213                 if (!acpi_device_dir(device))
 214                         return -ENODEV;
 215         }
 216
 217         /* 'state' [R] */
 218         entry = proc_create_data(ACPI_AC_FILE_STATE,
 219                                  S_IRUGO, acpi_device_dir(device),
 220                                  &acpi_ac_fops, acpi_driver_data(device));
 221         if (!entry)
 222                 return -ENODEV;
 223         return 0;
 224 }
 225
 226 static int acpi_ac_remove_fs(struct acpi_device *device)
 227 {
 228
 229         if (acpi_device_dir(device)) {
 230                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
 231
 232                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
 233                 acpi_device_dir(device) = NULL;
 234         }
 235
 236         return 0;
 237 }
 238 #endif
 239
 240 /* --------------------------------------------------------------------------
 241                                    Driver Model
 242    -------------------------------------------------------------------------- */
 243
 244 static void acpi_ac_notify(struct acpi_device *device, u32 event)
 245 {
 246         struct acpi_ac *ac = acpi_driver_data(device);
 247
 248
 249         if (!ac)
 250                 return;
 251
 252         switch (event) {
 253         default:
 254                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 255                                   "Unsupported event [0x%x]\n", event));
 256         case ACPI_AC_NOTIFY_STATUS:
 257         case ACPI_NOTIFY_BUS_CHECK:
 258         case ACPI_NOTIFY_DEVICE_CHECK:
 259                 /*
 260                  * A buggy BIOS may notify AC first and then sleep for
 261                  * a specific time before doing actual operations in the
 262                  * EC event handler (_Qxx). This will cause the AC state
 263                  * reported by the ACPI event to be incorrect, so wait for a
 264                  * specific time for the EC event handler to make progress.
 265                  */
 266                 if (ac_sleep_before_get_state_ms > 0)
 267                         msleep(ac_sleep_before_get_state_ms);
 268
 269                 acpi_ac_get_state(ac);
 270                 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
 271                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 272                                                   dev_name(&device->dev), event,
 273                                                   (u32) ac->state);
 274                 acpi_notifier_call_chain(device, event, (u32) ac->state);
 275                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 276         }
 277
 278         return;
 279 }
 280
 281 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
 282 {
 283         ac_sleep_before_get_state_ms = 1000;
 284         return 0;
 285 }
 286
 287 static struct dmi_system_id ac_dmi_table[] = {
 288         {
 289         .callback = thinkpad_e530_quirk,
 290         .ident = "thinkpad e530",
 291         .matches = {
 292                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 293                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
 294                 },
 295         },
 296         {},
 297 };
 298
 299 static int acpi_ac_add(struct acpi_device *device)
 300 {
 301         int result = 0;
 302         struct acpi_ac *ac = NULL;
 303
 304
 305         if (!device)
 306                 return -EINVAL;
 307
 308         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 309         if (!ac)
 310                 return -ENOMEM;
 311
 312         ac->device = device;
 313         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 314         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 315         device->driver_data = ac;
 316
 317         result = acpi_ac_get_state(ac);
 318         if (result)
 319                 goto end;
 320
 321 #ifdef CONFIG_ACPI_PROCFS_POWER
 322         result = acpi_ac_add_fs(device);
 323 #endif
 324         if (result)
 325                 goto end;
 326         ac->charger.name = acpi_device_bid(device);
 327         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
 328         ac->charger.properties = ac_props;
 329         ac->charger.num_properties = ARRAY_SIZE(ac_props);
 330         ac->charger.get_property = get_ac_property;
 331         result = power_supply_register(&ac->device->dev, &ac->charger);
 332         if (result)
 333                 goto end;
 334
 335         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 336                acpi_device_name(device), acpi_device_bid(device),
 337                ac->state ? "on-line" : "off-line");
 338
 339       end:
 340         if (result) {
 341 #ifdef CONFIG_ACPI_PROCFS_POWER
 342                 acpi_ac_remove_fs(device);
 343 #endif
 344                 kfree(ac);
 345         }
 346
 347         dmi_check_system(ac_dmi_table);
 348         return result;
 349 }
 350
 351 #ifdef CONFIG_PM_SLEEP
 352 static int acpi_ac_resume(struct device *dev)
 353 {
 354         struct acpi_ac *ac;
 355         unsigned old_state;
 356
 357         if (!dev)
 358                 return -EINVAL;
 359
 360         ac = acpi_driver_data(to_acpi_device(dev));
 361         if (!ac)
 362                 return -EINVAL;
 363
 364         old_state = ac->state;
 365         if (acpi_ac_get_state(ac))
 366                 return 0;
 367         if (old_state != ac->state)
 368                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 369         return 0;
 370 }
 371 #endif
 372
 373 static int acpi_ac_remove(struct acpi_device *device)
 374 {
 375         struct acpi_ac *ac = NULL;
 376
 377
 378         if (!device || !acpi_driver_data(device))
 379                 return -EINVAL;
 380
 381         ac = acpi_driver_data(device);
 382
 383         if (ac->charger.dev)
 384                 power_supply_unregister(&ac->charger);
 385 #ifdef CONFIG_ACPI_PROCFS_POWER
 386         acpi_ac_remove_fs(device);
 387 #endif
 388
 389         kfree(ac);
 390
 391         return 0;
 392 }
 393
 394 static int __init acpi_ac_init(void)
 395 {
 396         int result;
 397
 398         if (acpi_disabled)
 399                 return -ENODEV;
 400
 401 #ifdef CONFIG_ACPI_PROCFS_POWER
 402         acpi_ac_dir = acpi_lock_ac_dir();
 403         if (!acpi_ac_dir)
 404                 return -ENODEV;
 405 #endif
 406
 407         result = acpi_bus_register_driver(&acpi_ac_driver);
 408         if (result < 0) {
 409 #ifdef CONFIG_ACPI_PROCFS_POWER
 410                 acpi_unlock_ac_dir(acpi_ac_dir);
 411 #endif
 412                 return -ENODEV;
 413         }
 414
 415         return 0;
 416 }
 417
 418 static void __exit acpi_ac_exit(void)
 419 {
 420
 421         acpi_bus_unregister_driver(&acpi_ac_driver);
 422
 423 #ifdef CONFIG_ACPI_PROCFS_POWER
 424         acpi_unlock_ac_dir(acpi_ac_dir);
 425 #endif
 426
 427         return;
 428 }
 429
 430 module_init(acpi_ac_init);
 431 module_exit(acpi_ac_exit);