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 #ifdef CONFIG_ACPI_PROCFS_POWER 17 #include <linux/proc_fs.h> 18 #include <linux/seq_file.h> 19 #endif 20 #include <linux/platform_device.h> 21 #include <linux/power_supply.h> 22 #include <linux/acpi.h> 23 #include <acpi/battery.h> 24 25 #define PREFIX "ACPI: " 26 27 #define ACPI_AC_CLASS "ac_adapter" 28 #define ACPI_AC_DEVICE_NAME "AC Adapter" 29 #define ACPI_AC_FILE_STATE "state" 30 #define ACPI_AC_NOTIFY_STATUS 0x80 31 #define ACPI_AC_STATUS_OFFLINE 0x00 32 #define ACPI_AC_STATUS_ONLINE 0x01 33 #define ACPI_AC_STATUS_UNKNOWN 0xFF 34 35 #define _COMPONENT ACPI_AC_COMPONENT 36 ACPI_MODULE_NAME("ac"); 37 38 MODULE_AUTHOR("Paul Diefenbaugh"); 39 MODULE_DESCRIPTION("ACPI AC Adapter Driver"); 40 MODULE_LICENSE("GPL"); 41 42 43 static int acpi_ac_add(struct acpi_device *device); 44 static int acpi_ac_remove(struct acpi_device *device); 45 static void acpi_ac_notify(struct acpi_device *device, u32 event); 46 47 struct acpi_ac_bl { 48 const char *hid; 49 int hrv; 50 }; 51 52 static const struct acpi_device_id ac_device_ids[] = { 53 {"ACPI0003", 0}, 54 {"", 0}, 55 }; 56 MODULE_DEVICE_TABLE(acpi, ac_device_ids); 57 58 /* Lists of PMIC ACPI HIDs with an (often better) native charger driver */ 59 static const struct acpi_ac_bl acpi_ac_blacklist[] = { 60 { "INT33F4", -1 }, /* X-Powers AXP288 PMIC */ 61 { "INT34D3", 3 }, /* Intel Cherrytrail Whiskey Cove PMIC */ 62 }; 63 64 #ifdef CONFIG_PM_SLEEP 65 static int acpi_ac_resume(struct device *dev); 66 #endif 67 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume); 68 69 #ifdef CONFIG_ACPI_PROCFS_POWER 70 extern struct proc_dir_entry *acpi_lock_ac_dir(void); 71 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir); 72 #endif 73 74 75 static int ac_sleep_before_get_state_ms; 76 static int ac_check_pmic = 1; 77 78 static struct acpi_driver acpi_ac_driver = { 79 .name = "ac", 80 .class = ACPI_AC_CLASS, 81 .ids = ac_device_ids, 82 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, 83 .ops = { 84 .add = acpi_ac_add, 85 .remove = acpi_ac_remove, 86 .notify = acpi_ac_notify, 87 }, 88 .drv.pm = &acpi_ac_pm, 89 }; 90 91 struct acpi_ac { 92 struct power_supply *charger; 93 struct power_supply_desc charger_desc; 94 struct acpi_device * device; 95 unsigned long long state; 96 struct notifier_block battery_nb; 97 }; 98 99 #define to_acpi_ac(x) power_supply_get_drvdata(x) 100 101 /* -------------------------------------------------------------------------- 102 AC Adapter Management 103 -------------------------------------------------------------------------- */ 104 105 static int acpi_ac_get_state(struct acpi_ac *ac) 106 { 107 acpi_status status = AE_OK; 108 109 if (!ac) 110 return -EINVAL; 111 112 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, 113 &ac->state); 114 if (ACPI_FAILURE(status)) { 115 ACPI_EXCEPTION((AE_INFO, status, 116 "Error reading AC Adapter state")); 117 ac->state = ACPI_AC_STATUS_UNKNOWN; 118 return -ENODEV; 119 } 120 121 return 0; 122 } 123 124 /* -------------------------------------------------------------------------- 125 sysfs I/F 126 -------------------------------------------------------------------------- */ 127 static int get_ac_property(struct power_supply *psy, 128 enum power_supply_property psp, 129 union power_supply_propval *val) 130 { 131 struct acpi_ac *ac = to_acpi_ac(psy); 132 133 if (!ac) 134 return -ENODEV; 135 136 if (acpi_ac_get_state(ac)) 137 return -ENODEV; 138 139 switch (psp) { 140 case POWER_SUPPLY_PROP_ONLINE: 141 val->intval = ac->state; 142 break; 143 default: 144 return -EINVAL; 145 } 146 return 0; 147 } 148 149 static enum power_supply_property ac_props[] = { 150 POWER_SUPPLY_PROP_ONLINE, 151 }; 152 153 #ifdef CONFIG_ACPI_PROCFS_POWER 154 /* -------------------------------------------------------------------------- 155 FS Interface (/proc) 156 -------------------------------------------------------------------------- */ 157 158 static struct proc_dir_entry *acpi_ac_dir; 159 160 static int acpi_ac_seq_show(struct seq_file *seq, void *offset) 161 { 162 struct acpi_ac *ac = seq->private; 163 164 165 if (!ac) 166 return 0; 167 168 if (acpi_ac_get_state(ac)) { 169 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); 170 return 0; 171 } 172 173 seq_puts(seq, "state: "); 174 switch (ac->state) { 175 case ACPI_AC_STATUS_OFFLINE: 176 seq_puts(seq, "off-line\n"); 177 break; 178 case ACPI_AC_STATUS_ONLINE: 179 seq_puts(seq, "on-line\n"); 180 break; 181 default: 182 seq_puts(seq, "unknown\n"); 183 break; 184 } 185 186 return 0; 187 } 188 189 static int acpi_ac_add_fs(struct acpi_ac *ac) 190 { 191 struct proc_dir_entry *entry = NULL; 192 193 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded," 194 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n"); 195 if (!acpi_device_dir(ac->device)) { 196 acpi_device_dir(ac->device) = 197 proc_mkdir(acpi_device_bid(ac->device), acpi_ac_dir); 198 if (!acpi_device_dir(ac->device)) 199 return -ENODEV; 200 } 201 202 /* 'state' [R] */ 203 entry = proc_create_single_data(ACPI_AC_FILE_STATE, S_IRUGO, 204 acpi_device_dir(ac->device), acpi_ac_seq_show, ac); 205 if (!entry) 206 return -ENODEV; 207 return 0; 208 } 209 210 static int acpi_ac_remove_fs(struct acpi_ac *ac) 211 { 212 213 if (acpi_device_dir(ac->device)) { 214 remove_proc_entry(ACPI_AC_FILE_STATE, 215 acpi_device_dir(ac->device)); 216 remove_proc_entry(acpi_device_bid(ac->device), acpi_ac_dir); 217 acpi_device_dir(ac->device) = NULL; 218 } 219 220 return 0; 221 } 222 #endif 223 224 /* -------------------------------------------------------------------------- 225 Driver Model 226 -------------------------------------------------------------------------- */ 227 228 static void acpi_ac_notify(struct acpi_device *device, u32 event) 229 { 230 struct acpi_ac *ac = acpi_driver_data(device); 231 232 if (!ac) 233 return; 234 235 switch (event) { 236 default: 237 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 238 "Unsupported event [0x%x]\n", event)); 239 /* fall through */ 240 case ACPI_AC_NOTIFY_STATUS: 241 case ACPI_NOTIFY_BUS_CHECK: 242 case ACPI_NOTIFY_DEVICE_CHECK: 243 /* 244 * A buggy BIOS may notify AC first and then sleep for 245 * a specific time before doing actual operations in the 246 * EC event handler (_Qxx). This will cause the AC state 247 * reported by the ACPI event to be incorrect, so wait for a 248 * specific time for the EC event handler to make progress. 249 */ 250 if (ac_sleep_before_get_state_ms > 0) 251 msleep(ac_sleep_before_get_state_ms); 252 253 acpi_ac_get_state(ac); 254 acpi_bus_generate_netlink_event(device->pnp.device_class, 255 dev_name(&device->dev), event, 256 (u32) ac->state); 257 acpi_notifier_call_chain(device, event, (u32) ac->state); 258 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE); 259 } 260 261 return; 262 } 263 264 static int acpi_ac_battery_notify(struct notifier_block *nb, 265 unsigned long action, void *data) 266 { 267 struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb); 268 struct acpi_bus_event *event = (struct acpi_bus_event *)data; 269 270 /* 271 * On HP Pavilion dv6-6179er AC status notifications aren't triggered 272 * when adapter is plugged/unplugged. However, battery status 273 * notifcations are triggered when battery starts charging or 274 * discharging. Re-reading AC status triggers lost AC notifications, 275 * if AC status has changed. 276 */ 277 if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 && 278 event->type == ACPI_BATTERY_NOTIFY_STATUS) 279 acpi_ac_get_state(ac); 280 281 return NOTIFY_OK; 282 } 283 284 static int __init thinkpad_e530_quirk(const struct dmi_system_id *d) 285 { 286 ac_sleep_before_get_state_ms = 1000; 287 return 0; 288 } 289 290 static int __init ac_do_not_check_pmic_quirk(const struct dmi_system_id *d) 291 { 292 ac_check_pmic = 0; 293 return 0; 294 } 295 296 static const struct dmi_system_id ac_dmi_table[] __initconst = { 297 { 298 /* Thinkpad e530 */ 299 .callback = thinkpad_e530_quirk, 300 .matches = { 301 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 302 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"), 303 }, 304 }, 305 { 306 /* ECS EF20EA */ 307 .callback = ac_do_not_check_pmic_quirk, 308 .matches = { 309 DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"), 310 }, 311 }, 312 { 313 /* Lenovo Ideapad Miix 320 */ 314 .callback = ac_do_not_check_pmic_quirk, 315 .matches = { 316 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"), 317 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "80XF"), 318 DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"), 319 }, 320 }, 321 {}, 322 }; 323 324 static int acpi_ac_add(struct acpi_device *device) 325 { 326 struct power_supply_config psy_cfg = {}; 327 int result = 0; 328 struct acpi_ac *ac = NULL; 329 330 331 if (!device) 332 return -EINVAL; 333 334 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); 335 if (!ac) 336 return -ENOMEM; 337 338 ac->device = device; 339 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); 340 strcpy(acpi_device_class(device), ACPI_AC_CLASS); 341 device->driver_data = ac; 342 343 result = acpi_ac_get_state(ac); 344 if (result) 345 goto end; 346 347 psy_cfg.drv_data = ac; 348 349 ac->charger_desc.name = acpi_device_bid(device); 350 #ifdef CONFIG_ACPI_PROCFS_POWER 351 result = acpi_ac_add_fs(ac); 352 if (result) 353 goto end; 354 #endif 355 ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS; 356 ac->charger_desc.properties = ac_props; 357 ac->charger_desc.num_properties = ARRAY_SIZE(ac_props); 358 ac->charger_desc.get_property = get_ac_property; 359 ac->charger = power_supply_register(&ac->device->dev, 360 &ac->charger_desc, &psy_cfg); 361 if (IS_ERR(ac->charger)) { 362 result = PTR_ERR(ac->charger); 363 goto end; 364 } 365 366 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 367 acpi_device_name(device), acpi_device_bid(device), 368 ac->state ? "on-line" : "off-line"); 369 370 ac->battery_nb.notifier_call = acpi_ac_battery_notify; 371 register_acpi_notifier(&ac->battery_nb); 372 end: 373 if (result) { 374 #ifdef CONFIG_ACPI_PROCFS_POWER 375 acpi_ac_remove_fs(ac); 376 #endif 377 kfree(ac); 378 } 379 380 return result; 381 } 382 383 #ifdef CONFIG_PM_SLEEP 384 static int acpi_ac_resume(struct device *dev) 385 { 386 struct acpi_ac *ac; 387 unsigned old_state; 388 389 if (!dev) 390 return -EINVAL; 391 392 ac = acpi_driver_data(to_acpi_device(dev)); 393 if (!ac) 394 return -EINVAL; 395 396 old_state = ac->state; 397 if (acpi_ac_get_state(ac)) 398 return 0; 399 if (old_state != ac->state) 400 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE); 401 return 0; 402 } 403 #else 404 #define acpi_ac_resume NULL 405 #endif 406 407 static int acpi_ac_remove(struct acpi_device *device) 408 { 409 struct acpi_ac *ac = NULL; 410 411 412 if (!device || !acpi_driver_data(device)) 413 return -EINVAL; 414 415 ac = acpi_driver_data(device); 416 417 power_supply_unregister(ac->charger); 418 unregister_acpi_notifier(&ac->battery_nb); 419 420 #ifdef CONFIG_ACPI_PROCFS_POWER 421 acpi_ac_remove_fs(ac); 422 #endif 423 424 kfree(ac); 425 426 return 0; 427 } 428 429 static int __init acpi_ac_init(void) 430 { 431 unsigned int i; 432 int result; 433 434 if (acpi_disabled) 435 return -ENODEV; 436 437 dmi_check_system(ac_dmi_table); 438 439 if (ac_check_pmic) { 440 for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++) 441 if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1", 442 acpi_ac_blacklist[i].hrv)) { 443 pr_info(PREFIX "AC: found native %s PMIC, not loading\n", 444 acpi_ac_blacklist[i].hid); 445 return -ENODEV; 446 } 447 } 448 449 #ifdef CONFIG_ACPI_PROCFS_POWER 450 acpi_ac_dir = acpi_lock_ac_dir(); 451 if (!acpi_ac_dir) 452 return -ENODEV; 453 #endif 454 455 456 result = acpi_bus_register_driver(&acpi_ac_driver); 457 if (result < 0) { 458 #ifdef CONFIG_ACPI_PROCFS_POWER 459 acpi_unlock_ac_dir(acpi_ac_dir); 460 #endif 461 return -ENODEV; 462 } 463 464 return 0; 465 } 466 467 static void __exit acpi_ac_exit(void) 468 { 469 acpi_bus_unregister_driver(&acpi_ac_driver); 470 #ifdef CONFIG_ACPI_PROCFS_POWER 471 acpi_unlock_ac_dir(acpi_ac_dir); 472 #endif 473 } 474 module_init(acpi_ac_init); 475 module_exit(acpi_ac_exit); 476