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