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 #define pr_fmt(fmt) "ACPI: AC: " fmt
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/init.h>
  15 #include <linux/types.h>
  16 #include <linux/dmi.h>
  17 #include <linux/delay.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/power_supply.h>
  20 #include <linux/acpi.h>
  21 #include <acpi/battery.h>
  22
  23 #define ACPI_AC_CLASS                   "ac_adapter"
  24 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
  25 #define ACPI_AC_FILE_STATE              "state"
  26 #define ACPI_AC_NOTIFY_STATUS           0x80
  27 #define ACPI_AC_STATUS_OFFLINE          0x00
  28 #define ACPI_AC_STATUS_ONLINE           0x01
  29 #define ACPI_AC_STATUS_UNKNOWN          0xFF
  30
  31 MODULE_AUTHOR("Paul Diefenbaugh");
  32 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
  33 MODULE_LICENSE("GPL");
  34
  35 static int acpi_ac_add(struct acpi_device *device);
  36 static int acpi_ac_remove(struct acpi_device *device);
  37 static void acpi_ac_notify(struct acpi_device *device, u32 event);
  38
  39 struct acpi_ac_bl {
  40         const char *hid;
  41         int hrv;
  42 };
  43
  44 static const struct acpi_device_id ac_device_ids[] = {
  45         {"ACPI0003", 0},
  46         {"", 0},
  47 };
  48 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  49
  50 #ifdef CONFIG_PM_SLEEP
  51 static int acpi_ac_resume(struct device *dev);
  52 #endif
  53 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
  54
  55 static int ac_sleep_before_get_state_ms;
  56 static int ac_only;
  57
  58 static struct acpi_driver acpi_ac_driver = {
  59         .name = "ac",
  60         .class = ACPI_AC_CLASS,
  61         .ids = ac_device_ids,
  62         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
  63         .ops = {
  64                 .add = acpi_ac_add,
  65                 .remove = acpi_ac_remove,
  66                 .notify = acpi_ac_notify,
  67                 },
  68         .drv.pm = &acpi_ac_pm,
  69 };
  70
  71 struct acpi_ac {
  72         struct power_supply *charger;
  73         struct power_supply_desc charger_desc;
  74         struct acpi_device *device;
  75         unsigned long long state;
  76         struct notifier_block battery_nb;
  77 };
  78
  79 #define to_acpi_ac(x) power_supply_get_drvdata(x)
  80
  81 /* AC Adapter Management */
  82 static int acpi_ac_get_state(struct acpi_ac *ac)
  83 {
  84         acpi_status status = AE_OK;
  85
  86         if (!ac)
  87                 return -EINVAL;
  88
  89         if (ac_only) {
  90                 ac->state = 1;
  91                 return 0;
  92         }
  93
  94         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
  95                                        &ac->state);
  96         if (ACPI_FAILURE(status)) {
  97                 acpi_handle_info(ac->device->handle,
  98                                 "Error reading AC Adapter state: %s\n",
  99                                 acpi_format_exception(status));
 100                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 101                 return -ENODEV;
 102         }
 103
 104         return 0;
 105 }
 106
 107 /* sysfs I/F */
 108 static int get_ac_property(struct power_supply *psy,
 109                            enum power_supply_property psp,
 110                            union power_supply_propval *val)
 111 {
 112         struct acpi_ac *ac = to_acpi_ac(psy);
 113
 114         if (!ac)
 115                 return -ENODEV;
 116
 117         if (acpi_ac_get_state(ac))
 118                 return -ENODEV;
 119
 120         switch (psp) {
 121         case POWER_SUPPLY_PROP_ONLINE:
 122                 val->intval = ac->state;
 123                 break;
 124         default:
 125                 return -EINVAL;
 126         }
 127
 128         return 0;
 129 }
 130
 131 static enum power_supply_property ac_props[] = {
 132         POWER_SUPPLY_PROP_ONLINE,
 133 };
 134
 135 /* Driver Model */
 136 static void acpi_ac_notify(struct acpi_device *device, u32 event)
 137 {
 138         struct acpi_ac *ac = acpi_driver_data(device);
 139
 140         if (!ac)
 141                 return;
 142
 143         switch (event) {
 144         default:
 145                 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
 146                                   event);
 147                 fallthrough;
 148         case ACPI_AC_NOTIFY_STATUS:
 149         case ACPI_NOTIFY_BUS_CHECK:
 150         case ACPI_NOTIFY_DEVICE_CHECK:
 151                 /*
 152                  * A buggy BIOS may notify AC first and then sleep for
 153                  * a specific time before doing actual operations in the
 154                  * EC event handler (_Qxx). This will cause the AC state
 155                  * reported by the ACPI event to be incorrect, so wait for a
 156                  * specific time for the EC event handler to make progress.
 157                  */
 158                 if (ac_sleep_before_get_state_ms > 0)
 159                         msleep(ac_sleep_before_get_state_ms);
 160
 161                 acpi_ac_get_state(ac);
 162                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 163                                                   dev_name(&device->dev), event,
 164                                                   (u32) ac->state);
 165                 acpi_notifier_call_chain(device, event, (u32) ac->state);
 166                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
 167         }
 168 }
 169
 170 static int acpi_ac_battery_notify(struct notifier_block *nb,
 171                                   unsigned long action, void *data)
 172 {
 173         struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
 174         struct acpi_bus_event *event = (struct acpi_bus_event *)data;
 175
 176         /*
 177          * On HP Pavilion dv6-6179er AC status notifications aren't triggered
 178          * when adapter is plugged/unplugged. However, battery status
 179          * notifications are triggered when battery starts charging or
 180          * discharging. Re-reading AC status triggers lost AC notifications,
 181          * if AC status has changed.
 182          */
 183         if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
 184             event->type == ACPI_BATTERY_NOTIFY_STATUS)
 185                 acpi_ac_get_state(ac);
 186
 187         return NOTIFY_OK;
 188 }
 189
 190 static int __init thinkpad_e530_quirk(const struct dmi_system_id *d)
 191 {
 192         ac_sleep_before_get_state_ms = 1000;
 193         return 0;
 194 }
 195
 196 static int __init ac_only_quirk(const struct dmi_system_id *d)
 197 {
 198         ac_only = 1;
 199         return 0;
 200 }
 201
 202 /* Please keep this list alphabetically sorted */
 203 static const struct dmi_system_id ac_dmi_table[]  __initconst = {
 204         {
 205                 /* Kodlix GK45 returning incorrect state */
 206                 .callback = ac_only_quirk,
 207                 .matches = {
 208                         DMI_MATCH(DMI_PRODUCT_NAME, "GK45"),
 209                 },
 210         },
 211         {
 212                 /* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */
 213                 .callback = thinkpad_e530_quirk,
 214                 .matches = {
 215                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 216                         DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
 217                 },
 218         },
 219         {},
 220 };
 221
 222 static int acpi_ac_add(struct acpi_device *device)
 223 {
 224         struct power_supply_config psy_cfg = {};
 225         int result = 0;
 226         struct acpi_ac *ac = NULL;
 227
 228
 229         if (!device)
 230                 return -EINVAL;
 231
 232         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 233         if (!ac)
 234                 return -ENOMEM;
 235
 236         ac->device = device;
 237         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 238         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 239         device->driver_data = ac;
 240
 241         result = acpi_ac_get_state(ac);
 242         if (result)
 243                 goto end;
 244
 245         psy_cfg.drv_data = ac;
 246
 247         ac->charger_desc.name = acpi_device_bid(device);
 248         ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
 249         ac->charger_desc.properties = ac_props;
 250         ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
 251         ac->charger_desc.get_property = get_ac_property;
 252         ac->charger = power_supply_register(&ac->device->dev,
 253                                             &ac->charger_desc, &psy_cfg);
 254         if (IS_ERR(ac->charger)) {
 255                 result = PTR_ERR(ac->charger);
 256                 goto end;
 257         }
 258
 259         pr_info("%s [%s] (%s)\n", acpi_device_name(device),
 260                 acpi_device_bid(device), ac->state ? "on-line" : "off-line");
 261
 262         ac->battery_nb.notifier_call = acpi_ac_battery_notify;
 263         register_acpi_notifier(&ac->battery_nb);
 264 end:
 265         if (result)
 266                 kfree(ac);
 267
 268         return result;
 269 }
 270
 271 #ifdef CONFIG_PM_SLEEP
 272 static int acpi_ac_resume(struct device *dev)
 273 {
 274         struct acpi_ac *ac;
 275         unsigned int old_state;
 276
 277         if (!dev)
 278                 return -EINVAL;
 279
 280         ac = acpi_driver_data(to_acpi_device(dev));
 281         if (!ac)
 282                 return -EINVAL;
 283
 284         old_state = ac->state;
 285         if (acpi_ac_get_state(ac))
 286                 return 0;
 287         if (old_state != ac->state)
 288                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
 289
 290         return 0;
 291 }
 292 #else
 293 #define acpi_ac_resume NULL
 294 #endif
 295
 296 static int acpi_ac_remove(struct acpi_device *device)
 297 {
 298         struct acpi_ac *ac = NULL;
 299
 300         if (!device || !acpi_driver_data(device))
 301                 return -EINVAL;
 302
 303         ac = acpi_driver_data(device);
 304
 305         power_supply_unregister(ac->charger);
 306         unregister_acpi_notifier(&ac->battery_nb);
 307
 308         kfree(ac);
 309
 310         return 0;
 311 }
 312
 313 static int __init acpi_ac_init(void)
 314 {
 315         int result;
 316
 317         if (acpi_disabled)
 318                 return -ENODEV;
 319
 320         if (acpi_quirk_skip_acpi_ac_and_battery())
 321                 return -ENODEV;
 322
 323         dmi_check_system(ac_dmi_table);
 324
 325         result = acpi_bus_register_driver(&acpi_ac_driver);
 326         if (result < 0)
 327                 return -ENODEV;
 328
 329         return 0;
 330 }
 331
 332 static void __exit acpi_ac_exit(void)
 333 {
 334         acpi_bus_unregister_driver(&acpi_ac_driver);
 335 }
 336 module_init(acpi_ac_init);
 337 module_exit(acpi_ac_exit);