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