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