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 #include <linux/platform_device.h>
  17 #include <linux/power_supply.h>
  18 #include <linux/acpi.h>
  19 #include <acpi/battery.h>
  20
  21 #define PREFIX "ACPI: "
  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 #define _COMPONENT              ACPI_AC_COMPONENT
  32 ACPI_MODULE_NAME("ac");
  33
  34 MODULE_AUTHOR("Paul Diefenbaugh");
  35 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
  36 MODULE_LICENSE("GPL");
  37
  38
  39 static int acpi_ac_add(struct acpi_device *device);
  40 static int acpi_ac_remove(struct acpi_device *device);
  41 static void acpi_ac_notify(struct acpi_device *device, u32 event);
  42
  43 struct acpi_ac_bl {
  44         const char *hid;
  45         int hrv;
  46 };
  47
  48 static const struct acpi_device_id ac_device_ids[] = {
  49         {"ACPI0003", 0},
  50         {"", 0},
  51 };
  52 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  53
  54 /* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
  55 static const struct acpi_ac_bl acpi_ac_blacklist[] = {
  56         { "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
  57         { "INT34D3",  3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
  58 };
  59
  60 #ifdef CONFIG_PM_SLEEP
  61 static int acpi_ac_resume(struct device *dev);
  62 #endif
  63 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
  64
  65 static int ac_sleep_before_get_state_ms;
  66 static int ac_check_pmic = 1;
  67
  68 static struct acpi_driver acpi_ac_driver = {
  69         .name = "ac",
  70         .class = ACPI_AC_CLASS,
  71         .ids = ac_device_ids,
  72         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
  73         .ops = {
  74                 .add = acpi_ac_add,
  75                 .remove = acpi_ac_remove,
  76                 .notify = acpi_ac_notify,
  77                 },
  78         .drv.pm = &acpi_ac_pm,
  79 };
  80
  81 struct acpi_ac {
  82         struct power_supply *charger;
  83         struct power_supply_desc charger_desc;
  84         struct acpi_device * device;
  85         unsigned long long state;
  86         struct notifier_block battery_nb;
  87 };
  88
  89 #define to_acpi_ac(x) power_supply_get_drvdata(x)
  90
  91 /* --------------------------------------------------------------------------
  92                                AC Adapter Management
  93    -------------------------------------------------------------------------- */
  94
  95 static int acpi_ac_get_state(struct acpi_ac *ac)
  96 {
  97         acpi_status status = AE_OK;
  98
  99         if (!ac)
 100                 return -EINVAL;
 101
 102         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
 103                                        &ac->state);
 104         if (ACPI_FAILURE(status)) {
 105                 ACPI_EXCEPTION((AE_INFO, status,
 106                                 "Error reading AC Adapter state"));
 107                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 108                 return -ENODEV;
 109         }
 110
 111         return 0;
 112 }
 113
 114 /* --------------------------------------------------------------------------
 115                             sysfs I/F
 116    -------------------------------------------------------------------------- */
 117 static int get_ac_property(struct power_supply *psy,
 118                            enum power_supply_property psp,
 119                            union power_supply_propval *val)
 120 {
 121         struct acpi_ac *ac = to_acpi_ac(psy);
 122
 123         if (!ac)
 124                 return -ENODEV;
 125
 126         if (acpi_ac_get_state(ac))
 127                 return -ENODEV;
 128
 129         switch (psp) {
 130         case POWER_SUPPLY_PROP_ONLINE:
 131                 val->intval = ac->state;
 132                 break;
 133         default:
 134                 return -EINVAL;
 135         }
 136         return 0;
 137 }
 138
 139 static enum power_supply_property ac_props[] = {
 140         POWER_SUPPLY_PROP_ONLINE,
 141 };
 142
 143 /* --------------------------------------------------------------------------
 144                                    Driver Model
 145    -------------------------------------------------------------------------- */
 146
 147 static void acpi_ac_notify(struct acpi_device *device, u32 event)
 148 {
 149         struct acpi_ac *ac = acpi_driver_data(device);
 150
 151         if (!ac)
 152                 return;
 153
 154         switch (event) {
 155         default:
 156                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 157                                   "Unsupported event [0x%x]\n", event));
 158                 fallthrough;
 159         case ACPI_AC_NOTIFY_STATUS:
 160         case ACPI_NOTIFY_BUS_CHECK:
 161         case ACPI_NOTIFY_DEVICE_CHECK:
 162                 /*
 163                  * A buggy BIOS may notify AC first and then sleep for
 164                  * a specific time before doing actual operations in the
 165                  * EC event handler (_Qxx). This will cause the AC state
 166                  * reported by the ACPI event to be incorrect, so wait for a
 167                  * specific time for the EC event handler to make progress.
 168                  */
 169                 if (ac_sleep_before_get_state_ms > 0)
 170                         msleep(ac_sleep_before_get_state_ms);
 171
 172                 acpi_ac_get_state(ac);
 173                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 174                                                   dev_name(&device->dev), event,
 175                                                   (u32) ac->state);
 176                 acpi_notifier_call_chain(device, event, (u32) ac->state);
 177                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
 178         }
 179
 180         return;
 181 }
 182
 183 static int acpi_ac_battery_notify(struct notifier_block *nb,
 184                                   unsigned long action, void *data)
 185 {
 186         struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
 187         struct acpi_bus_event *event = (struct acpi_bus_event *)data;
 188
 189         /*
 190          * On HP Pavilion dv6-6179er AC status notifications aren't triggered
 191          * when adapter is plugged/unplugged. However, battery status
 192          * notifcations are triggered when battery starts charging or
 193          * discharging. Re-reading AC status triggers lost AC notifications,
 194          * if AC status has changed.
 195          */
 196         if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
 197             event->type == ACPI_BATTERY_NOTIFY_STATUS)
 198                 acpi_ac_get_state(ac);
 199
 200         return NOTIFY_OK;
 201 }
 202
 203 static int __init thinkpad_e530_quirk(const struct dmi_system_id *d)
 204 {
 205         ac_sleep_before_get_state_ms = 1000;
 206         return 0;
 207 }
 208
 209 static int __init ac_do_not_check_pmic_quirk(const struct dmi_system_id *d)
 210 {
 211         ac_check_pmic = 0;
 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                 /* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */
 226                 .callback = ac_do_not_check_pmic_quirk,
 227                 .matches = {
 228                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 229                         DMI_MATCH(DMI_PRODUCT_NAME, "80XF"),
 230                         DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
 231                 },
 232         },
 233         {
 234                 /* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */
 235                 .callback = thinkpad_e530_quirk,
 236                 .matches = {
 237                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 238                         DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
 239                 },
 240         },
 241         {},
 242 };
 243
 244 static int acpi_ac_add(struct acpi_device *device)
 245 {
 246         struct power_supply_config psy_cfg = {};
 247         int result = 0;
 248         struct acpi_ac *ac = NULL;
 249
 250
 251         if (!device)
 252                 return -EINVAL;
 253
 254         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 255         if (!ac)
 256                 return -ENOMEM;
 257
 258         ac->device = device;
 259         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 260         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 261         device->driver_data = ac;
 262
 263         result = acpi_ac_get_state(ac);
 264         if (result)
 265                 goto end;
 266
 267         psy_cfg.drv_data = ac;
 268
 269         ac->charger_desc.name = acpi_device_bid(device);
 270         ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
 271         ac->charger_desc.properties = ac_props;
 272         ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
 273         ac->charger_desc.get_property = get_ac_property;
 274         ac->charger = power_supply_register(&ac->device->dev,
 275                                             &ac->charger_desc, &psy_cfg);
 276         if (IS_ERR(ac->charger)) {
 277                 result = PTR_ERR(ac->charger);
 278                 goto end;
 279         }
 280
 281         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 282                acpi_device_name(device), acpi_device_bid(device),
 283                ac->state ? "on-line" : "off-line");
 284
 285         ac->battery_nb.notifier_call = acpi_ac_battery_notify;
 286         register_acpi_notifier(&ac->battery_nb);
 287 end:
 288         if (result) {
 289                 kfree(ac);
 290         }
 291
 292         return result;
 293 }
 294
 295 #ifdef CONFIG_PM_SLEEP
 296 static int acpi_ac_resume(struct device *dev)
 297 {
 298         struct acpi_ac *ac;
 299         unsigned old_state;
 300
 301         if (!dev)
 302                 return -EINVAL;
 303
 304         ac = acpi_driver_data(to_acpi_device(dev));
 305         if (!ac)
 306                 return -EINVAL;
 307
 308         old_state = ac->state;
 309         if (acpi_ac_get_state(ac))
 310                 return 0;
 311         if (old_state != ac->state)
 312                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
 313         return 0;
 314 }
 315 #else
 316 #define acpi_ac_resume NULL
 317 #endif
 318
 319 static int acpi_ac_remove(struct acpi_device *device)
 320 {
 321         struct acpi_ac *ac = NULL;
 322
 323
 324         if (!device || !acpi_driver_data(device))
 325                 return -EINVAL;
 326
 327         ac = acpi_driver_data(device);
 328
 329         power_supply_unregister(ac->charger);
 330         unregister_acpi_notifier(&ac->battery_nb);
 331
 332         kfree(ac);
 333
 334         return 0;
 335 }
 336
 337 static int __init acpi_ac_init(void)
 338 {
 339         unsigned int i;
 340         int result;
 341
 342         if (acpi_disabled)
 343                 return -ENODEV;
 344
 345         dmi_check_system(ac_dmi_table);
 346
 347         if (ac_check_pmic) {
 348                 for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++)
 349                         if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1",
 350                                              acpi_ac_blacklist[i].hrv)) {
 351                                 pr_info(PREFIX "AC: found native %s PMIC, not loading\n",
 352                                         acpi_ac_blacklist[i].hid);
 353                                 return -ENODEV;
 354                         }
 355         }
 356
 357         result = acpi_bus_register_driver(&acpi_ac_driver);
 358         if (result < 0) {
 359                 return -ENODEV;
 360         }
 361
 362         return 0;
 363 }
 364
 365 static void __exit acpi_ac_exit(void)
 366 {
 367         acpi_bus_unregister_driver(&acpi_ac_driver);
 368 }
 369 module_init(acpi_ac_init);
 370 module_exit(acpi_ac_exit);