drivers/acpi/ac.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
   4  *
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/slab.h>
  12 #include <linux/init.h>
  13 #include <linux/types.h>
  14 #include <linux/dmi.h>
  15 #include <linux/delay.h>
  16 #ifdef CONFIG_ACPI_PROCFS_POWER
  17 #include <linux/proc_fs.h>
  18 #include <linux/seq_file.h>
  19 #endif
  20 #include <linux/platform_device.h>
  21 #include <linux/power_supply.h>
  22 #include <linux/acpi.h>
  23 #include <acpi/battery.h>
  24
  25 #define PREFIX "ACPI: "
  26
  27 #define ACPI_AC_CLASS                   "ac_adapter"
  28 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
  29 #define ACPI_AC_FILE_STATE              "state"
  30 #define ACPI_AC_NOTIFY_STATUS           0x80
  31 #define ACPI_AC_STATUS_OFFLINE          0x00
  32 #define ACPI_AC_STATUS_ONLINE           0x01
  33 #define ACPI_AC_STATUS_UNKNOWN          0xFF
  34
  35 #define _COMPONENT              ACPI_AC_COMPONENT
  36 ACPI_MODULE_NAME("ac");
  37
  38 MODULE_AUTHOR("Paul Diefenbaugh");
  39 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
  40 MODULE_LICENSE("GPL");
  41
  42
  43 static int acpi_ac_add(struct acpi_device *device);
  44 static int acpi_ac_remove(struct acpi_device *device);
  45 static void acpi_ac_notify(struct acpi_device *device, u32 event);
  46
  47 struct acpi_ac_bl {
  48         const char *hid;
  49         int hrv;
  50 };
  51
  52 static const struct acpi_device_id ac_device_ids[] = {
  53         {"ACPI0003", 0},
  54         {"", 0},
  55 };
  56 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  57
  58 /* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
  59 static const struct acpi_ac_bl acpi_ac_blacklist[] = {
  60         { "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
  61         { "INT34D3",  3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
  62 };
  63
  64 #ifdef CONFIG_PM_SLEEP
  65 static int acpi_ac_resume(struct device *dev);
  66 #endif
  67 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
  68
  69 #ifdef CONFIG_ACPI_PROCFS_POWER
  70 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  71 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  72 #endif
  73
  74
  75 static int ac_sleep_before_get_state_ms;
  76 static int ac_check_pmic = 1;
  77
  78 static struct acpi_driver acpi_ac_driver = {
  79         .name = "ac",
  80         .class = ACPI_AC_CLASS,
  81         .ids = ac_device_ids,
  82         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
  83         .ops = {
  84                 .add = acpi_ac_add,
  85                 .remove = acpi_ac_remove,
  86                 .notify = acpi_ac_notify,
  87                 },
  88         .drv.pm = &acpi_ac_pm,
  89 };
  90
  91 struct acpi_ac {
  92         struct power_supply *charger;
  93         struct power_supply_desc charger_desc;
  94         struct acpi_device * device;
  95         unsigned long long state;
  96         struct notifier_block battery_nb;
  97 };
  98
  99 #define to_acpi_ac(x) power_supply_get_drvdata(x)
 100
 101 /* --------------------------------------------------------------------------
 102                                AC Adapter Management
 103    -------------------------------------------------------------------------- */
 104
 105 static int acpi_ac_get_state(struct acpi_ac *ac)
 106 {
 107         acpi_status status = AE_OK;
 108
 109         if (!ac)
 110                 return -EINVAL;
 111
 112         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
 113                                        &ac->state);
 114         if (ACPI_FAILURE(status)) {
 115                 ACPI_EXCEPTION((AE_INFO, status,
 116                                 "Error reading AC Adapter state"));
 117                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 118                 return -ENODEV;
 119         }
 120
 121         return 0;
 122 }
 123
 124 /* --------------------------------------------------------------------------
 125                             sysfs I/F
 126    -------------------------------------------------------------------------- */
 127 static int get_ac_property(struct power_supply *psy,
 128                            enum power_supply_property psp,
 129                            union power_supply_propval *val)
 130 {
 131         struct acpi_ac *ac = to_acpi_ac(psy);
 132
 133         if (!ac)
 134                 return -ENODEV;
 135
 136         if (acpi_ac_get_state(ac))
 137                 return -ENODEV;
 138
 139         switch (psp) {
 140         case POWER_SUPPLY_PROP_ONLINE:
 141                 val->intval = ac->state;
 142                 break;
 143         default:
 144                 return -EINVAL;
 145         }
 146         return 0;
 147 }
 148
 149 static enum power_supply_property ac_props[] = {
 150         POWER_SUPPLY_PROP_ONLINE,
 151 };
 152
 153 #ifdef CONFIG_ACPI_PROCFS_POWER
 154 /* --------------------------------------------------------------------------
 155                               FS Interface (/proc)
 156    -------------------------------------------------------------------------- */
 157
 158 static struct proc_dir_entry *acpi_ac_dir;
 159
 160 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 161 {
 162         struct acpi_ac *ac = seq->private;
 163
 164
 165         if (!ac)
 166                 return 0;
 167
 168         if (acpi_ac_get_state(ac)) {
 169                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 170                 return 0;
 171         }
 172
 173         seq_puts(seq, "state:                   ");
 174         switch (ac->state) {
 175         case ACPI_AC_STATUS_OFFLINE:
 176                 seq_puts(seq, "off-line\n");
 177                 break;
 178         case ACPI_AC_STATUS_ONLINE:
 179                 seq_puts(seq, "on-line\n");
 180                 break;
 181         default:
 182                 seq_puts(seq, "unknown\n");
 183                 break;
 184         }
 185
 186         return 0;
 187 }
 188
 189 static int acpi_ac_add_fs(struct acpi_ac *ac)
 190 {
 191         struct proc_dir_entry *entry = NULL;
 192
 193         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
 194                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 195         if (!acpi_device_dir(ac->device)) {
 196                 acpi_device_dir(ac->device) =
 197                         proc_mkdir(acpi_device_bid(ac->device), acpi_ac_dir);
 198                 if (!acpi_device_dir(ac->device))
 199                         return -ENODEV;
 200         }
 201
 202         /* 'state' [R] */
 203         entry = proc_create_single_data(ACPI_AC_FILE_STATE, S_IRUGO,
 204                         acpi_device_dir(ac->device), acpi_ac_seq_show, ac);
 205         if (!entry)
 206                 return -ENODEV;
 207         return 0;
 208 }
 209
 210 static int acpi_ac_remove_fs(struct acpi_ac *ac)
 211 {
 212
 213         if (acpi_device_dir(ac->device)) {
 214                 remove_proc_entry(ACPI_AC_FILE_STATE,
 215                                   acpi_device_dir(ac->device));
 216                 remove_proc_entry(acpi_device_bid(ac->device), acpi_ac_dir);
 217                 acpi_device_dir(ac->device) = NULL;
 218         }
 219
 220         return 0;
 221 }
 222 #endif
 223
 224 /* --------------------------------------------------------------------------
 225                                    Driver Model
 226    -------------------------------------------------------------------------- */
 227
 228 static void acpi_ac_notify(struct acpi_device *device, u32 event)
 229 {
 230         struct acpi_ac *ac = acpi_driver_data(device);
 231
 232         if (!ac)
 233                 return;
 234
 235         switch (event) {
 236         default:
 237                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 238                                   "Unsupported event [0x%x]\n", event));
 239         /* fall through */
 240         case ACPI_AC_NOTIFY_STATUS:
 241         case ACPI_NOTIFY_BUS_CHECK:
 242         case ACPI_NOTIFY_DEVICE_CHECK:
 243                 /*
 244                  * A buggy BIOS may notify AC first and then sleep for
 245                  * a specific time before doing actual operations in the
 246                  * EC event handler (_Qxx). This will cause the AC state
 247                  * reported by the ACPI event to be incorrect, so wait for a
 248                  * specific time for the EC event handler to make progress.
 249                  */
 250                 if (ac_sleep_before_get_state_ms > 0)
 251                         msleep(ac_sleep_before_get_state_ms);
 252
 253                 acpi_ac_get_state(ac);
 254                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 255                                                   dev_name(&device->dev), event,
 256                                                   (u32) ac->state);
 257                 acpi_notifier_call_chain(device, event, (u32) ac->state);
 258                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
 259         }
 260
 261         return;
 262 }
 263
 264 static int acpi_ac_battery_notify(struct notifier_block *nb,
 265                                   unsigned long action, void *data)
 266 {
 267         struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
 268         struct acpi_bus_event *event = (struct acpi_bus_event *)data;
 269
 270         /*
 271          * On HP Pavilion dv6-6179er AC status notifications aren't triggered
 272          * when adapter is plugged/unplugged. However, battery status
 273          * notifcations are triggered when battery starts charging or
 274          * discharging. Re-reading AC status triggers lost AC notifications,
 275          * if AC status has changed.
 276          */
 277         if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
 278             event->type == ACPI_BATTERY_NOTIFY_STATUS)
 279                 acpi_ac_get_state(ac);
 280
 281         return NOTIFY_OK;
 282 }
 283
 284 static int __init thinkpad_e530_quirk(const struct dmi_system_id *d)
 285 {
 286         ac_sleep_before_get_state_ms = 1000;
 287         return 0;
 288 }
 289
 290 static int __init ac_do_not_check_pmic_quirk(const struct dmi_system_id *d)
 291 {
 292         ac_check_pmic = 0;
 293         return 0;
 294 }
 295
 296 static const struct dmi_system_id ac_dmi_table[]  __initconst = {
 297         {
 298         /* Thinkpad e530 */
 299         .callback = thinkpad_e530_quirk,
 300         .matches = {
 301                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 302                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
 303                 },
 304         },
 305         {
 306                 /* ECS EF20EA */
 307                 .callback = ac_do_not_check_pmic_quirk,
 308                 .matches = {
 309                         DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
 310                 },
 311         },
 312         {
 313                 /* Lenovo Ideapad Miix 320 */
 314                 .callback = ac_do_not_check_pmic_quirk,
 315                 .matches = {
 316                   DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 317                   DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "80XF"),
 318                   DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
 319                 },
 320         },
 321         {},
 322 };
 323
 324 static int acpi_ac_add(struct acpi_device *device)
 325 {
 326         struct power_supply_config psy_cfg = {};
 327         int result = 0;
 328         struct acpi_ac *ac = NULL;
 329
 330
 331         if (!device)
 332                 return -EINVAL;
 333
 334         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 335         if (!ac)
 336                 return -ENOMEM;
 337
 338         ac->device = device;
 339         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 340         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 341         device->driver_data = ac;
 342
 343         result = acpi_ac_get_state(ac);
 344         if (result)
 345                 goto end;
 346
 347         psy_cfg.drv_data = ac;
 348
 349         ac->charger_desc.name = acpi_device_bid(device);
 350 #ifdef CONFIG_ACPI_PROCFS_POWER
 351         result = acpi_ac_add_fs(ac);
 352         if (result)
 353                 goto end;
 354 #endif
 355         ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
 356         ac->charger_desc.properties = ac_props;
 357         ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
 358         ac->charger_desc.get_property = get_ac_property;
 359         ac->charger = power_supply_register(&ac->device->dev,
 360                                             &ac->charger_desc, &psy_cfg);
 361         if (IS_ERR(ac->charger)) {
 362                 result = PTR_ERR(ac->charger);
 363                 goto end;
 364         }
 365
 366         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 367                acpi_device_name(device), acpi_device_bid(device),
 368                ac->state ? "on-line" : "off-line");
 369
 370         ac->battery_nb.notifier_call = acpi_ac_battery_notify;
 371         register_acpi_notifier(&ac->battery_nb);
 372 end:
 373         if (result) {
 374 #ifdef CONFIG_ACPI_PROCFS_POWER
 375                 acpi_ac_remove_fs(ac);
 376 #endif
 377                 kfree(ac);
 378         }
 379
 380         return result;
 381 }
 382
 383 #ifdef CONFIG_PM_SLEEP
 384 static int acpi_ac_resume(struct device *dev)
 385 {
 386         struct acpi_ac *ac;
 387         unsigned old_state;
 388
 389         if (!dev)
 390                 return -EINVAL;
 391
 392         ac = acpi_driver_data(to_acpi_device(dev));
 393         if (!ac)
 394                 return -EINVAL;
 395
 396         old_state = ac->state;
 397         if (acpi_ac_get_state(ac))
 398                 return 0;
 399         if (old_state != ac->state)
 400                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
 401         return 0;
 402 }
 403 #else
 404 #define acpi_ac_resume NULL
 405 #endif
 406
 407 static int acpi_ac_remove(struct acpi_device *device)
 408 {
 409         struct acpi_ac *ac = NULL;
 410
 411
 412         if (!device || !acpi_driver_data(device))
 413                 return -EINVAL;
 414
 415         ac = acpi_driver_data(device);
 416
 417         power_supply_unregister(ac->charger);
 418         unregister_acpi_notifier(&ac->battery_nb);
 419
 420 #ifdef CONFIG_ACPI_PROCFS_POWER
 421         acpi_ac_remove_fs(ac);
 422 #endif
 423
 424         kfree(ac);
 425
 426         return 0;
 427 }
 428
 429 static int __init acpi_ac_init(void)
 430 {
 431         unsigned int i;
 432         int result;
 433
 434         if (acpi_disabled)
 435                 return -ENODEV;
 436
 437         dmi_check_system(ac_dmi_table);
 438
 439         if (ac_check_pmic) {
 440                 for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++)
 441                         if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1",
 442                                              acpi_ac_blacklist[i].hrv)) {
 443                                 pr_info(PREFIX "AC: found native %s PMIC, not loading\n",
 444                                         acpi_ac_blacklist[i].hid);
 445                                 return -ENODEV;
 446                         }
 447         }
 448
 449 #ifdef CONFIG_ACPI_PROCFS_POWER
 450         acpi_ac_dir = acpi_lock_ac_dir();
 451         if (!acpi_ac_dir)
 452                 return -ENODEV;
 453 #endif
 454
 455
 456         result = acpi_bus_register_driver(&acpi_ac_driver);
 457         if (result < 0) {
 458 #ifdef CONFIG_ACPI_PROCFS_POWER
 459                 acpi_unlock_ac_dir(acpi_ac_dir);
 460 #endif
 461                 return -ENODEV;
 462         }
 463
 464         return 0;
 465 }
 466
 467 static void __exit acpi_ac_exit(void)
 468 {
 469         acpi_bus_unregister_driver(&acpi_ac_driver);
 470 #ifdef CONFIG_ACPI_PROCFS_POWER
 471         acpi_unlock_ac_dir(acpi_ac_dir);
 472 #endif
 473 }
 474 module_init(acpi_ac_init);
 475 module_exit(acpi_ac_exit);