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 static int acpi_ac_add(struct acpi_device *device); 36 static void acpi_ac_remove(struct acpi_device *device); 37 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data); 38 39 static const struct acpi_device_id ac_device_ids[] = { 40 {"ACPI0003", 0}, 41 {"", 0}, 42 }; 43 MODULE_DEVICE_TABLE(acpi, ac_device_ids); 44 45 #ifdef CONFIG_PM_SLEEP 46 static int acpi_ac_resume(struct device *dev); 47 #endif 48 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume); 49 50 static int ac_sleep_before_get_state_ms; 51 static int ac_only; 52 53 static struct acpi_driver acpi_ac_driver = { 54 .name = "ac", 55 .class = ACPI_AC_CLASS, 56 .ids = ac_device_ids, 57 .ops = { 58 .add = acpi_ac_add, 59 .remove = acpi_ac_remove, 60 }, 61 .drv.pm = &acpi_ac_pm, 62 }; 63 64 struct acpi_ac { 65 struct power_supply *charger; 66 struct power_supply_desc charger_desc; 67 struct acpi_device *device; 68 unsigned long long state; 69 struct notifier_block battery_nb; 70 }; 71 72 #define to_acpi_ac(x) power_supply_get_drvdata(x) 73 74 /* AC Adapter Management */ 75 static int acpi_ac_get_state(struct acpi_ac *ac) 76 { 77 acpi_status status = AE_OK; 78 79 if (!ac) 80 return -EINVAL; 81 82 if (ac_only) { 83 ac->state = 1; 84 return 0; 85 } 86 87 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, 88 &ac->state); 89 if (ACPI_FAILURE(status)) { 90 acpi_handle_info(ac->device->handle, 91 "Error reading AC Adapter state: %s\n", 92 acpi_format_exception(status)); 93 ac->state = ACPI_AC_STATUS_UNKNOWN; 94 return -ENODEV; 95 } 96 97 return 0; 98 } 99 100 /* sysfs I/F */ 101 static int get_ac_property(struct power_supply *psy, 102 enum power_supply_property psp, 103 union power_supply_propval *val) 104 { 105 struct acpi_ac *ac = to_acpi_ac(psy); 106 107 if (!ac) 108 return -ENODEV; 109 110 if (acpi_ac_get_state(ac)) 111 return -ENODEV; 112 113 switch (psp) { 114 case POWER_SUPPLY_PROP_ONLINE: 115 val->intval = ac->state; 116 break; 117 default: 118 return -EINVAL; 119 } 120 121 return 0; 122 } 123 124 static enum power_supply_property ac_props[] = { 125 POWER_SUPPLY_PROP_ONLINE, 126 }; 127 128 /* Driver Model */ 129 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data) 130 { 131 struct acpi_device *device = data; 132 struct acpi_ac *ac = acpi_driver_data(device); 133 134 if (!ac) 135 return; 136 137 switch (event) { 138 default: 139 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", 140 event); 141 fallthrough; 142 case ACPI_AC_NOTIFY_STATUS: 143 case ACPI_NOTIFY_BUS_CHECK: 144 case ACPI_NOTIFY_DEVICE_CHECK: 145 /* 146 * A buggy BIOS may notify AC first and then sleep for 147 * a specific time before doing actual operations in the 148 * EC event handler (_Qxx). This will cause the AC state 149 * reported by the ACPI event to be incorrect, so wait for a 150 * specific time for the EC event handler to make progress. 151 */ 152 if (ac_sleep_before_get_state_ms > 0) 153 msleep(ac_sleep_before_get_state_ms); 154 155 acpi_ac_get_state(ac); 156 acpi_bus_generate_netlink_event(device->pnp.device_class, 157 dev_name(&device->dev), event, 158 (u32) ac->state); 159 acpi_notifier_call_chain(device, event, (u32) ac->state); 160 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE); 161 } 162 } 163 164 static int acpi_ac_battery_notify(struct notifier_block *nb, 165 unsigned long action, void *data) 166 { 167 struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb); 168 struct acpi_bus_event *event = (struct acpi_bus_event *)data; 169 170 /* 171 * On HP Pavilion dv6-6179er AC status notifications aren't triggered 172 * when adapter is plugged/unplugged. However, battery status 173 * notifications are triggered when battery starts charging or 174 * discharging. Re-reading AC status triggers lost AC notifications, 175 * if AC status has changed. 176 */ 177 if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 && 178 event->type == ACPI_BATTERY_NOTIFY_STATUS) 179 acpi_ac_get_state(ac); 180 181 return NOTIFY_OK; 182 } 183 184 static int __init thinkpad_e530_quirk(const struct dmi_system_id *d) 185 { 186 ac_sleep_before_get_state_ms = 1000; 187 return 0; 188 } 189 190 static int __init ac_only_quirk(const struct dmi_system_id *d) 191 { 192 ac_only = 1; 193 return 0; 194 } 195 196 /* Please keep this list alphabetically sorted */ 197 static const struct dmi_system_id ac_dmi_table[] __initconst = { 198 { 199 /* Kodlix GK45 returning incorrect state */ 200 .callback = ac_only_quirk, 201 .matches = { 202 DMI_MATCH(DMI_PRODUCT_NAME, "GK45"), 203 }, 204 }, 205 { 206 /* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */ 207 .callback = thinkpad_e530_quirk, 208 .matches = { 209 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 210 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"), 211 }, 212 }, 213 {}, 214 }; 215 216 static int acpi_ac_add(struct acpi_device *device) 217 { 218 struct power_supply_config psy_cfg = {}; 219 int result = 0; 220 struct acpi_ac *ac = NULL; 221 222 223 if (!device) 224 return -EINVAL; 225 226 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); 227 if (!ac) 228 return -ENOMEM; 229 230 ac->device = device; 231 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); 232 strcpy(acpi_device_class(device), ACPI_AC_CLASS); 233 device->driver_data = ac; 234 235 result = acpi_ac_get_state(ac); 236 if (result) 237 goto err_release_ac; 238 239 psy_cfg.drv_data = ac; 240 241 ac->charger_desc.name = acpi_device_bid(device); 242 ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS; 243 ac->charger_desc.properties = ac_props; 244 ac->charger_desc.num_properties = ARRAY_SIZE(ac_props); 245 ac->charger_desc.get_property = get_ac_property; 246 ac->charger = power_supply_register(&ac->device->dev, 247 &ac->charger_desc, &psy_cfg); 248 if (IS_ERR(ac->charger)) { 249 result = PTR_ERR(ac->charger); 250 goto err_release_ac; 251 } 252 253 pr_info("%s [%s] (%s)\n", acpi_device_name(device), 254 acpi_device_bid(device), ac->state ? "on-line" : "off-line"); 255 256 ac->battery_nb.notifier_call = acpi_ac_battery_notify; 257 register_acpi_notifier(&ac->battery_nb); 258 259 result = acpi_dev_install_notify_handler(device, ACPI_ALL_NOTIFY, 260 acpi_ac_notify); 261 if (result) 262 goto err_unregister; 263 264 return 0; 265 266 err_unregister: 267 power_supply_unregister(ac->charger); 268 unregister_acpi_notifier(&ac->battery_nb); 269 err_release_ac: 270 kfree(ac); 271 272 return result; 273 } 274 275 #ifdef CONFIG_PM_SLEEP 276 static int acpi_ac_resume(struct device *dev) 277 { 278 struct acpi_ac *ac; 279 unsigned int old_state; 280 281 if (!dev) 282 return -EINVAL; 283 284 ac = acpi_driver_data(to_acpi_device(dev)); 285 if (!ac) 286 return -EINVAL; 287 288 old_state = ac->state; 289 if (acpi_ac_get_state(ac)) 290 return 0; 291 if (old_state != ac->state) 292 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE); 293 294 return 0; 295 } 296 #else 297 #define acpi_ac_resume NULL 298 #endif 299 300 static void acpi_ac_remove(struct acpi_device *device) 301 { 302 struct acpi_ac *ac = NULL; 303 304 if (!device || !acpi_driver_data(device)) 305 return; 306 307 ac = acpi_driver_data(device); 308 309 acpi_dev_remove_notify_handler(device, ACPI_ALL_NOTIFY, 310 acpi_ac_notify); 311 power_supply_unregister(ac->charger); 312 unregister_acpi_notifier(&ac->battery_nb); 313 314 kfree(ac); 315 } 316 317 static int __init acpi_ac_init(void) 318 { 319 int result; 320 321 if (acpi_disabled) 322 return -ENODEV; 323 324 if (acpi_quirk_skip_acpi_ac_and_battery()) 325 return -ENODEV; 326 327 dmi_check_system(ac_dmi_table); 328 329 result = acpi_bus_register_driver(&acpi_ac_driver); 330 if (result < 0) 331 return -ENODEV; 332 333 return 0; 334 } 335 336 static void __exit acpi_ac_exit(void) 337 { 338 acpi_bus_unregister_driver(&acpi_ac_driver); 339 } 340 module_init(acpi_ac_init); 341 module_exit(acpi_ac_exit); 342