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/platform_device.h>
  38 #include <linux/power_supply.h>
  39 #include <linux/acpi.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
  59 static int acpi_ac_add(struct acpi_device *device);
  60 static int acpi_ac_remove(struct acpi_device *device);
  61 static void acpi_ac_notify(struct acpi_device *device, u32 event);
  62
  63 static const struct acpi_device_id ac_device_ids[] = {
  64         {"ACPI0003", 0},
  65         {"", 0},
  66 };
  67 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  68
  69 #ifdef CONFIG_PM_SLEEP
  70 static int acpi_ac_resume(struct device *dev);
  71 #endif
  72 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
  73
  74 #ifdef CONFIG_ACPI_PROCFS_POWER
  75 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  76 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  77 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
  78 #endif
  79
  80
  81 static int ac_sleep_before_get_state_ms;
  82
  83 static struct acpi_driver acpi_ac_driver = {
  84         .name = "ac",
  85         .class = ACPI_AC_CLASS,
  86         .ids = ac_device_ids,
  87         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
  88         .ops = {
  89                 .add = acpi_ac_add,
  90                 .remove = acpi_ac_remove,
  91                 .notify = acpi_ac_notify,
  92                 },
  93         .drv.pm = &acpi_ac_pm,
  94 };
  95
  96 struct acpi_ac {
  97         struct power_supply charger;
  98         struct acpi_device * device;
  99         unsigned long long state;
 100 };
 101
 102 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
 103
 104 #ifdef CONFIG_ACPI_PROCFS_POWER
 105 static const struct file_operations acpi_ac_fops = {
 106         .owner = THIS_MODULE,
 107         .open = acpi_ac_open_fs,
 108         .read = seq_read,
 109         .llseek = seq_lseek,
 110         .release = single_release,
 111 };
 112 #endif
 113
 114 /* --------------------------------------------------------------------------
 115                                AC Adapter Management
 116    -------------------------------------------------------------------------- */
 117
 118 static int acpi_ac_get_state(struct acpi_ac *ac)
 119 {
 120         acpi_status status = AE_OK;
 121
 122         if (!ac)
 123                 return -EINVAL;
 124
 125         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
 126                                        &ac->state);
 127         if (ACPI_FAILURE(status)) {
 128                 ACPI_EXCEPTION((AE_INFO, status,
 129                                 "Error reading AC Adapter state"));
 130                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 131                 return -ENODEV;
 132         }
 133
 134         return 0;
 135 }
 136
 137 /* --------------------------------------------------------------------------
 138                             sysfs I/F
 139    -------------------------------------------------------------------------- */
 140 static int get_ac_property(struct power_supply *psy,
 141                            enum power_supply_property psp,
 142                            union power_supply_propval *val)
 143 {
 144         struct acpi_ac *ac = to_acpi_ac(psy);
 145
 146         if (!ac)
 147                 return -ENODEV;
 148
 149         if (acpi_ac_get_state(ac))
 150                 return -ENODEV;
 151
 152         switch (psp) {
 153         case POWER_SUPPLY_PROP_ONLINE:
 154                 val->intval = ac->state;
 155                 break;
 156         default:
 157                 return -EINVAL;
 158         }
 159         return 0;
 160 }
 161
 162 static enum power_supply_property ac_props[] = {
 163         POWER_SUPPLY_PROP_ONLINE,
 164 };
 165
 166 #ifdef CONFIG_ACPI_PROCFS_POWER
 167 /* --------------------------------------------------------------------------
 168                               FS Interface (/proc)
 169    -------------------------------------------------------------------------- */
 170
 171 static struct proc_dir_entry *acpi_ac_dir;
 172
 173 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 174 {
 175         struct acpi_ac *ac = seq->private;
 176
 177
 178         if (!ac)
 179                 return 0;
 180
 181         if (acpi_ac_get_state(ac)) {
 182                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 183                 return 0;
 184         }
 185
 186         seq_puts(seq, "state:                   ");
 187         switch (ac->state) {
 188         case ACPI_AC_STATUS_OFFLINE:
 189                 seq_puts(seq, "off-line\n");
 190                 break;
 191         case ACPI_AC_STATUS_ONLINE:
 192                 seq_puts(seq, "on-line\n");
 193                 break;
 194         default:
 195                 seq_puts(seq, "unknown\n");
 196                 break;
 197         }
 198
 199         return 0;
 200 }
 201
 202 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
 203 {
 204         return single_open(file, acpi_ac_seq_show, PDE_DATA(inode));
 205 }
 206
 207 static int acpi_ac_add_fs(struct acpi_ac *ac)
 208 {
 209         struct proc_dir_entry *entry = NULL;
 210
 211         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
 212                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 213         if (!acpi_device_dir(ac->device)) {
 214                 acpi_device_dir(ac->device) =
 215                         proc_mkdir(acpi_device_bid(ac->device), acpi_ac_dir);
 216                 if (!acpi_device_dir(ac->device))
 217                         return -ENODEV;
 218         }
 219
 220         /* 'state' [R] */
 221         entry = proc_create_data(ACPI_AC_FILE_STATE,
 222                                  S_IRUGO, acpi_device_dir(ac->device),
 223                                  &acpi_ac_fops, ac);
 224         if (!entry)
 225                 return -ENODEV;
 226         return 0;
 227 }
 228
 229 static int acpi_ac_remove_fs(struct acpi_ac *ac)
 230 {
 231
 232         if (acpi_device_dir(ac->device)) {
 233                 remove_proc_entry(ACPI_AC_FILE_STATE,
 234                                   acpi_device_dir(ac->device));
 235                 remove_proc_entry(acpi_device_bid(ac->device), acpi_ac_dir);
 236                 acpi_device_dir(ac->device) = NULL;
 237         }
 238
 239         return 0;
 240 }
 241 #endif
 242
 243 /* --------------------------------------------------------------------------
 244                                    Driver Model
 245    -------------------------------------------------------------------------- */
 246
 247 static void acpi_ac_notify(struct acpi_device *device, u32 event)
 248 {
 249         struct acpi_ac *ac = acpi_driver_data(device);
 250
 251         if (!ac)
 252                 return;
 253
 254         switch (event) {
 255         default:
 256                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 257                                   "Unsupported event [0x%x]\n", event));
 258         case ACPI_AC_NOTIFY_STATUS:
 259         case ACPI_NOTIFY_BUS_CHECK:
 260         case ACPI_NOTIFY_DEVICE_CHECK:
 261                 /*
 262                  * A buggy BIOS may notify AC first and then sleep for
 263                  * a specific time before doing actual operations in the
 264                  * EC event handler (_Qxx). This will cause the AC state
 265                  * reported by the ACPI event to be incorrect, so wait for a
 266                  * specific time for the EC event handler to make progress.
 267                  */
 268                 if (ac_sleep_before_get_state_ms > 0)
 269                         msleep(ac_sleep_before_get_state_ms);
 270
 271                 acpi_ac_get_state(ac);
 272                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 273                                                   dev_name(&device->dev), event,
 274                                                   (u32) ac->state);
 275                 acpi_notifier_call_chain(device, event, (u32) ac->state);
 276                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 277         }
 278
 279         return;
 280 }
 281
 282 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
 283 {
 284         ac_sleep_before_get_state_ms = 1000;
 285         return 0;
 286 }
 287
 288 static struct dmi_system_id ac_dmi_table[] = {
 289         {
 290         .callback = thinkpad_e530_quirk,
 291         .ident = "thinkpad e530",
 292         .matches = {
 293                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 294                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
 295                 },
 296         },
 297         {},
 298 };
 299
 300 static int acpi_ac_add(struct acpi_device *device)
 301 {
 302         int result = 0;
 303         struct acpi_ac *ac = NULL;
 304
 305
 306         if (!device)
 307                 return -EINVAL;
 308
 309         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 310         if (!ac)
 311                 return -ENOMEM;
 312
 313         ac->device = device;
 314         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 315         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 316         device->driver_data = ac;
 317
 318         result = acpi_ac_get_state(ac);
 319         if (result)
 320                 goto end;
 321
 322         ac->charger.name = acpi_device_bid(device);
 323 #ifdef CONFIG_ACPI_PROCFS_POWER
 324         result = acpi_ac_add_fs(ac);
 325         if (result)
 326                 goto end;
 327 #endif
 328         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
 329         ac->charger.properties = ac_props;
 330         ac->charger.num_properties = ARRAY_SIZE(ac_props);
 331         ac->charger.get_property = get_ac_property;
 332         result = power_supply_register(&ac->device->dev, &ac->charger);
 333         if (result)
 334                 goto end;
 335
 336         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 337                acpi_device_name(device), acpi_device_bid(device),
 338                ac->state ? "on-line" : "off-line");
 339
 340 end:
 341         if (result) {
 342 #ifdef CONFIG_ACPI_PROCFS_POWER
 343                 acpi_ac_remove_fs(ac);
 344 #endif
 345                 kfree(ac);
 346         }
 347
 348         dmi_check_system(ac_dmi_table);
 349         return result;
 350 }
 351
 352 #ifdef CONFIG_PM_SLEEP
 353 static int acpi_ac_resume(struct device *dev)
 354 {
 355         struct acpi_ac *ac;
 356         unsigned old_state;
 357
 358         if (!dev)
 359                 return -EINVAL;
 360
 361         ac = acpi_driver_data(to_acpi_device(dev));
 362         if (!ac)
 363                 return -EINVAL;
 364
 365         old_state = ac->state;
 366         if (acpi_ac_get_state(ac))
 367                 return 0;
 368         if (old_state != ac->state)
 369                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 370         return 0;
 371 }
 372 #else
 373 #define acpi_ac_resume NULL
 374 #endif
 375
 376 static int acpi_ac_remove(struct acpi_device *device)
 377 {
 378         struct acpi_ac *ac = NULL;
 379
 380
 381         if (!device || !acpi_driver_data(device))
 382                 return -EINVAL;
 383
 384         ac = acpi_driver_data(device);
 385
 386         if (ac->charger.dev)
 387                 power_supply_unregister(&ac->charger);
 388
 389 #ifdef CONFIG_ACPI_PROCFS_POWER
 390         acpi_ac_remove_fs(ac);
 391 #endif
 392
 393         kfree(ac);
 394
 395         return 0;
 396 }
 397
 398 static int __init acpi_ac_init(void)
 399 {
 400         int result;
 401
 402         if (acpi_disabled)
 403                 return -ENODEV;
 404
 405 #ifdef CONFIG_ACPI_PROCFS_POWER
 406         acpi_ac_dir = acpi_lock_ac_dir();
 407         if (!acpi_ac_dir)
 408                 return -ENODEV;
 409 #endif
 410
 411
 412         result = acpi_bus_register_driver(&acpi_ac_driver);
 413         if (result < 0) {
 414 #ifdef CONFIG_ACPI_PROCFS_POWER
 415                 acpi_unlock_ac_dir(acpi_ac_dir);
 416 #endif
 417                 return -ENODEV;
 418         }
 419
 420         return 0;
 421 }
 422
 423 static void __exit acpi_ac_exit(void)
 424 {
 425         acpi_bus_unregister_driver(&acpi_ac_driver);
 426 #ifdef CONFIG_ACPI_PROCFS_POWER
 427         acpi_unlock_ac_dir(acpi_ac_dir);
 428 #endif
 429 }
 430 module_init(acpi_ac_init);
 431 module_exit(acpi_ac_exit);