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