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); 371