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 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); 375