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 <[email protected]>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
   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
  36 static int acpi_ac_add(struct acpi_device *device);
  37 static int acpi_ac_remove(struct acpi_device *device);
  38 static void acpi_ac_notify(struct acpi_device *device, u32 event);
  39
  40 struct acpi_ac_bl {
  41         const char *hid;
  42         int hrv;
  43 };
  44
  45 static const struct acpi_device_id ac_device_ids[] = {
  46         {"ACPI0003", 0},
  47         {"", 0},
  48 };
  49 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  50
  51 /* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
  52 static const struct acpi_ac_bl acpi_ac_blacklist[] = {
  53         { "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
  54         { "INT34D3",  3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
  55 };
  56
  57 #ifdef CONFIG_PM_SLEEP
  58 static int acpi_ac_resume(struct device *dev);
  59 #endif
  60 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
  61
  62 static int ac_sleep_before_get_state_ms;
  63 static int ac_check_pmic = 1;
  64 static int ac_only;
  65
  66 static struct acpi_driver acpi_ac_driver = {
  67         .name = "ac",
  68         .class = ACPI_AC_CLASS,
  69         .ids = ac_device_ids,
  70         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
  71         .ops = {
  72                 .add = acpi_ac_add,
  73                 .remove = acpi_ac_remove,
  74                 .notify = acpi_ac_notify,
  75                 },
  76         .drv.pm = &acpi_ac_pm,
  77 };
  78
  79 struct acpi_ac {
  80         struct power_supply *charger;
  81         struct power_supply_desc charger_desc;
  82         struct acpi_device *device;
  83         unsigned long long state;
  84         struct notifier_block battery_nb;
  85 };
  86
  87 #define to_acpi_ac(x) power_supply_get_drvdata(x)
  88
  89 /* AC Adapter Management */
  90 static int acpi_ac_get_state(struct acpi_ac *ac)
  91 {
  92         acpi_status status = AE_OK;
  93
  94         if (!ac)
  95                 return -EINVAL;
  96
  97         if (ac_only) {
  98                 ac->state = 1;
  99                 return 0;
 100         }
 101
 102         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
 103                                        &ac->state);
 104         if (ACPI_FAILURE(status)) {
 105                 acpi_handle_info(ac->device->handle,
 106                                 "Error reading AC Adapter state: %s\n",
 107                                 acpi_format_exception(status));
 108                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 109                 return -ENODEV;
 110         }
 111
 112         return 0;
 113 }
 114
 115 /* sysfs I/F */
 116 static int get_ac_property(struct power_supply *psy,
 117                            enum power_supply_property psp,
 118                            union power_supply_propval *val)
 119 {
 120         struct acpi_ac *ac = to_acpi_ac(psy);
 121
 122         if (!ac)
 123                 return -ENODEV;
 124
 125         if (acpi_ac_get_state(ac))
 126                 return -ENODEV;
 127
 128         switch (psp) {
 129         case POWER_SUPPLY_PROP_ONLINE:
 130                 val->intval = ac->state;
 131                 break;
 132         default:
 133                 return -EINVAL;
 134         }
 135         return 0;
 136 }
 137
 138 static enum power_supply_property ac_props[] = {
 139         POWER_SUPPLY_PROP_ONLINE,
 140 };
 141
 142 /* Driver Model */
 143 static void acpi_ac_notify(struct acpi_device *device, u32 event)
 144 {
 145         struct acpi_ac *ac = acpi_driver_data(device);
 146
 147         if (!ac)
 148                 return;
 149
 150         switch (event) {
 151         default:
 152                 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
 153                                   event);
 154                 fallthrough;
 155         case ACPI_AC_NOTIFY_STATUS:
 156         case ACPI_NOTIFY_BUS_CHECK:
 157         case ACPI_NOTIFY_DEVICE_CHECK:
 158                 /*
 159                  * A buggy BIOS may notify AC first and then sleep for
 160                  * a specific time before doing actual operations in the
 161                  * EC event handler (_Qxx). This will cause the AC state
 162                  * reported by the ACPI event to be incorrect, so wait for a
 163                  * specific time for the EC event handler to make progress.
 164                  */
 165                 if (ac_sleep_before_get_state_ms > 0)
 166                         msleep(ac_sleep_before_get_state_ms);
 167
 168                 acpi_ac_get_state(ac);
 169                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 170                                                   dev_name(&device->dev), event,
 171                                                   (u32) ac->state);
 172                 acpi_notifier_call_chain(device, event, (u32) ac->state);
 173                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
 174         }
 175 }
 176
 177 static int acpi_ac_battery_notify(struct notifier_block *nb,
 178                                   unsigned long action, void *data)
 179 {
 180         struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
 181         struct acpi_bus_event *event = (struct acpi_bus_event *)data;
 182
 183         /*
 184          * On HP Pavilion dv6-6179er AC status notifications aren't triggered
 185          * when adapter is plugged/unplugged. However, battery status
 186          * notifications are triggered when battery starts charging or
 187          * discharging. Re-reading AC status triggers lost AC notifications,
 188          * if AC status has changed.
 189          */
 190         if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
 191             event->type == ACPI_BATTERY_NOTIFY_STATUS)
 192                 acpi_ac_get_state(ac);
 193
 194         return NOTIFY_OK;
 195 }
 196
 197 static int __init thinkpad_e530_quirk(const struct dmi_system_id *d)
 198 {
 199         ac_sleep_before_get_state_ms = 1000;
 200         return 0;
 201 }
 202
 203 static int __init ac_do_not_check_pmic_quirk(const struct dmi_system_id *d)
 204 {
 205         ac_check_pmic = 0;
 206         return 0;
 207 }
 208
 209 static int __init ac_only_quirk(const struct dmi_system_id *d)
 210 {
 211         ac_only = 1;
 212         return 0;
 213 }
 214
 215 /* Please keep this list alphabetically sorted */
 216 static const struct dmi_system_id ac_dmi_table[]  __initconst = {
 217         {
 218                 /* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
 219                 .callback = ac_do_not_check_pmic_quirk,
 220                 .matches = {
 221                         DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
 222                 },
 223         },
 224         {
 225                 /* Kodlix GK45 returning incorrect state */
 226                 .callback = ac_only_quirk,
 227                 .matches = {
 228                         DMI_MATCH(DMI_PRODUCT_NAME, "GK45"),
 229                 },
 230         },
 231         {
 232                 /* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */
 233                 .callback = ac_do_not_check_pmic_quirk,
 234                 .matches = {
 235                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 236                         DMI_MATCH(DMI_PRODUCT_NAME, "80XF"),
 237                         DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
 238                 },
 239         },
 240         {
 241                 /* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */
 242                 .callback = thinkpad_e530_quirk,
 243                 .matches = {
 244                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 245                         DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
 246                 },
 247         },
 248         {},
 249 };
 250
 251 static int acpi_ac_add(struct acpi_device *device)
 252 {
 253         struct power_supply_config psy_cfg = {};
 254         int result = 0;
 255         struct acpi_ac *ac = NULL;
 256
 257
 258         if (!device)
 259                 return -EINVAL;
 260
 261         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 262         if (!ac)
 263                 return -ENOMEM;
 264
 265         ac->device = device;
 266         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 267         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 268         device->driver_data = ac;
 269
 270         result = acpi_ac_get_state(ac);
 271         if (result)
 272                 goto end;
 273
 274         psy_cfg.drv_data = ac;
 275
 276         ac->charger_desc.name = acpi_device_bid(device);
 277         ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
 278         ac->charger_desc.properties = ac_props;
 279         ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
 280         ac->charger_desc.get_property = get_ac_property;
 281         ac->charger = power_supply_register(&ac->device->dev,
 282                                             &ac->charger_desc, &psy_cfg);
 283         if (IS_ERR(ac->charger)) {
 284                 result = PTR_ERR(ac->charger);
 285                 goto end;
 286         }
 287
 288         pr_info("%s [%s] (%s)\n", acpi_device_name(device),
 289                 acpi_device_bid(device), ac->state ? "on-line" : "off-line");
 290
 291         ac->battery_nb.notifier_call = acpi_ac_battery_notify;
 292         register_acpi_notifier(&ac->battery_nb);
 293 end:
 294         if (result)
 295                 kfree(ac);
 296
 297         return result;
 298 }
 299
 300 #ifdef CONFIG_PM_SLEEP
 301 static int acpi_ac_resume(struct device *dev)
 302 {
 303         struct acpi_ac *ac;
 304         unsigned int old_state;
 305
 306         if (!dev)
 307                 return -EINVAL;
 308
 309         ac = acpi_driver_data(to_acpi_device(dev));
 310         if (!ac)
 311                 return -EINVAL;
 312
 313         old_state = ac->state;
 314         if (acpi_ac_get_state(ac))
 315                 return 0;
 316         if (old_state != ac->state)
 317                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
 318         return 0;
 319 }
 320 #else
 321 #define acpi_ac_resume NULL
 322 #endif
 323
 324 static int acpi_ac_remove(struct acpi_device *device)
 325 {
 326         struct acpi_ac *ac = NULL;
 327
 328
 329         if (!device || !acpi_driver_data(device))
 330                 return -EINVAL;
 331
 332         ac = acpi_driver_data(device);
 333
 334         power_supply_unregister(ac->charger);
 335         unregister_acpi_notifier(&ac->battery_nb);
 336
 337         kfree(ac);
 338
 339         return 0;
 340 }
 341
 342 static int __init acpi_ac_init(void)
 343 {
 344         unsigned int i;
 345         int result;
 346
 347         if (acpi_disabled)
 348                 return -ENODEV;
 349
 350         dmi_check_system(ac_dmi_table);
 351
 352         if (ac_check_pmic) {
 353                 for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++)
 354                         if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1",
 355                                              acpi_ac_blacklist[i].hrv)) {
 356                                 pr_info("found native %s PMIC, not loading\n",
 357                                         acpi_ac_blacklist[i].hid);
 358                                 return -ENODEV;
 359                         }
 360         }
 361
 362         result = acpi_bus_register_driver(&acpi_ac_driver);
 363         if (result < 0)
 364                 return -ENODEV;
 365
 366         return 0;
 367 }
 368
 369 static void __exit acpi_ac_exit(void)
 370 {
 371         acpi_bus_unregister_driver(&acpi_ac_driver);
 372 }
 373 module_init(acpi_ac_init);
 374 module_exit(acpi_ac_exit);