1 /* 2 * acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $) 3 * 4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 6 * 7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or (at 12 * your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, but 15 * WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * General Public License for more details. 18 * 19 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 20 */ 21 22 #include <linux/kernel.h> 23 #include <linux/module.h> 24 #include <linux/slab.h> 25 #include <linux/init.h> 26 #include <linux/types.h> 27 #include <linux/dmi.h> 28 #include <linux/delay.h> 29 #ifdef CONFIG_ACPI_PROCFS_POWER 30 #include <linux/proc_fs.h> 31 #include <linux/seq_file.h> 32 #endif 33 #include <linux/platform_device.h> 34 #include <linux/power_supply.h> 35 #include <linux/acpi.h> 36 #include <acpi/battery.h> 37 38 #define PREFIX "ACPI: " 39 40 #define ACPI_AC_CLASS "ac_adapter" 41 #define ACPI_AC_DEVICE_NAME "AC Adapter" 42 #define ACPI_AC_FILE_STATE "state" 43 #define ACPI_AC_NOTIFY_STATUS 0x80 44 #define ACPI_AC_STATUS_OFFLINE 0x00 45 #define ACPI_AC_STATUS_ONLINE 0x01 46 #define ACPI_AC_STATUS_UNKNOWN 0xFF 47 48 #define _COMPONENT ACPI_AC_COMPONENT 49 ACPI_MODULE_NAME("ac"); 50 51 MODULE_AUTHOR("Paul Diefenbaugh"); 52 MODULE_DESCRIPTION("ACPI AC Adapter Driver"); 53 MODULE_LICENSE("GPL"); 54 55 56 static int acpi_ac_add(struct acpi_device *device); 57 static int acpi_ac_remove(struct acpi_device *device); 58 static void acpi_ac_notify(struct acpi_device *device, u32 event); 59 60 struct acpi_ac_bl { 61 const char *hid; 62 int hrv; 63 }; 64 65 static const struct acpi_device_id ac_device_ids[] = { 66 {"ACPI0003", 0}, 67 {"", 0}, 68 }; 69 MODULE_DEVICE_TABLE(acpi, ac_device_ids); 70 71 /* Lists of PMIC ACPI HIDs with an (often better) native charger driver */ 72 static const struct acpi_ac_bl acpi_ac_blacklist[] = { 73 { "INT33F4", -1 }, /* X-Powers AXP288 PMIC */ 74 { "INT34D3", 3 }, /* Intel Cherrytrail Whiskey Cove PMIC */ 75 }; 76 77 #ifdef CONFIG_PM_SLEEP 78 static int acpi_ac_resume(struct device *dev); 79 #endif 80 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume); 81 82 #ifdef CONFIG_ACPI_PROCFS_POWER 83 extern struct proc_dir_entry *acpi_lock_ac_dir(void); 84 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir); 85 #endif 86 87 88 static int ac_sleep_before_get_state_ms; 89 static int ac_check_pmic = 1; 90 91 static struct acpi_driver acpi_ac_driver = { 92 .name = "ac", 93 .class = ACPI_AC_CLASS, 94 .ids = ac_device_ids, 95 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, 96 .ops = { 97 .add = acpi_ac_add, 98 .remove = acpi_ac_remove, 99 .notify = acpi_ac_notify, 100 }, 101 .drv.pm = &acpi_ac_pm, 102 }; 103 104 struct acpi_ac { 105 struct power_supply *charger; 106 struct power_supply_desc charger_desc; 107 struct acpi_device * device; 108 unsigned long long state; 109 struct notifier_block battery_nb; 110 }; 111 112 #define to_acpi_ac(x) power_supply_get_drvdata(x) 113 114 /* -------------------------------------------------------------------------- 115 AC Adapter Management 116 -------------------------------------------------------------------------- */ 117 118 static int acpi_ac_get_state(struct acpi_ac *ac) 119 { 120 acpi_status status = AE_OK; 121 122 if (!ac) 123 return -EINVAL; 124 125 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, 126 &ac->state); 127 if (ACPI_FAILURE(status)) { 128 ACPI_EXCEPTION((AE_INFO, status, 129 "Error reading AC Adapter state")); 130 ac->state = ACPI_AC_STATUS_UNKNOWN; 131 return -ENODEV; 132 } 133 134 return 0; 135 } 136 137 /* -------------------------------------------------------------------------- 138 sysfs I/F 139 -------------------------------------------------------------------------- */ 140 static int get_ac_property(struct power_supply *psy, 141 enum power_supply_property psp, 142 union power_supply_propval *val) 143 { 144 struct acpi_ac *ac = to_acpi_ac(psy); 145 146 if (!ac) 147 return -ENODEV; 148 149 if (acpi_ac_get_state(ac)) 150 return -ENODEV; 151 152 switch (psp) { 153 case POWER_SUPPLY_PROP_ONLINE: 154 val->intval = ac->state; 155 break; 156 default: 157 return -EINVAL; 158 } 159 return 0; 160 } 161 162 static enum power_supply_property ac_props[] = { 163 POWER_SUPPLY_PROP_ONLINE, 164 }; 165 166 #ifdef CONFIG_ACPI_PROCFS_POWER 167 /* -------------------------------------------------------------------------- 168 FS Interface (/proc) 169 -------------------------------------------------------------------------- */ 170 171 static struct proc_dir_entry *acpi_ac_dir; 172 173 static int acpi_ac_seq_show(struct seq_file *seq, void *offset) 174 { 175 struct acpi_ac *ac = seq->private; 176 177 178 if (!ac) 179 return 0; 180 181 if (acpi_ac_get_state(ac)) { 182 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); 183 return 0; 184 } 185 186 seq_puts(seq, "state: "); 187 switch (ac->state) { 188 case ACPI_AC_STATUS_OFFLINE: 189 seq_puts(seq, "off-line\n"); 190 break; 191 case ACPI_AC_STATUS_ONLINE: 192 seq_puts(seq, "on-line\n"); 193 break; 194 default: 195 seq_puts(seq, "unknown\n"); 196 break; 197 } 198 199 return 0; 200 } 201 202 static int acpi_ac_add_fs(struct acpi_ac *ac) 203 { 204 struct proc_dir_entry *entry = NULL; 205 206 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded," 207 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n"); 208 if (!acpi_device_dir(ac->device)) { 209 acpi_device_dir(ac->device) = 210 proc_mkdir(acpi_device_bid(ac->device), acpi_ac_dir); 211 if (!acpi_device_dir(ac->device)) 212 return -ENODEV; 213 } 214 215 /* 'state' [R] */ 216 entry = proc_create_single_data(ACPI_AC_FILE_STATE, S_IRUGO, 217 acpi_device_dir(ac->device), acpi_ac_seq_show, ac); 218 if (!entry) 219 return -ENODEV; 220 return 0; 221 } 222 223 static int acpi_ac_remove_fs(struct acpi_ac *ac) 224 { 225 226 if (acpi_device_dir(ac->device)) { 227 remove_proc_entry(ACPI_AC_FILE_STATE, 228 acpi_device_dir(ac->device)); 229 remove_proc_entry(acpi_device_bid(ac->device), acpi_ac_dir); 230 acpi_device_dir(ac->device) = NULL; 231 } 232 233 return 0; 234 } 235 #endif 236 237 /* -------------------------------------------------------------------------- 238 Driver Model 239 -------------------------------------------------------------------------- */ 240 241 static void acpi_ac_notify(struct acpi_device *device, u32 event) 242 { 243 struct acpi_ac *ac = acpi_driver_data(device); 244 245 if (!ac) 246 return; 247 248 switch (event) { 249 default: 250 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 251 "Unsupported event [0x%x]\n", event)); 252 /* fall through */ 253 case ACPI_AC_NOTIFY_STATUS: 254 case ACPI_NOTIFY_BUS_CHECK: 255 case ACPI_NOTIFY_DEVICE_CHECK: 256 /* 257 * A buggy BIOS may notify AC first and then sleep for 258 * a specific time before doing actual operations in the 259 * EC event handler (_Qxx). This will cause the AC state 260 * reported by the ACPI event to be incorrect, so wait for a 261 * specific time for the EC event handler to make progress. 262 */ 263 if (ac_sleep_before_get_state_ms > 0) 264 msleep(ac_sleep_before_get_state_ms); 265 266 acpi_ac_get_state(ac); 267 acpi_bus_generate_netlink_event(device->pnp.device_class, 268 dev_name(&device->dev), event, 269 (u32) ac->state); 270 acpi_notifier_call_chain(device, event, (u32) ac->state); 271 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE); 272 } 273 274 return; 275 } 276 277 static int acpi_ac_battery_notify(struct notifier_block *nb, 278 unsigned long action, void *data) 279 { 280 struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb); 281 struct acpi_bus_event *event = (struct acpi_bus_event *)data; 282 283 /* 284 * On HP Pavilion dv6-6179er AC status notifications aren't triggered 285 * when adapter is plugged/unplugged. However, battery status 286 * notifcations are triggered when battery starts charging or 287 * discharging. Re-reading AC status triggers lost AC notifications, 288 * if AC status has changed. 289 */ 290 if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 && 291 event->type == ACPI_BATTERY_NOTIFY_STATUS) 292 acpi_ac_get_state(ac); 293 294 return NOTIFY_OK; 295 } 296 297 static int __init thinkpad_e530_quirk(const struct dmi_system_id *d) 298 { 299 ac_sleep_before_get_state_ms = 1000; 300 return 0; 301 } 302 303 static int __init ac_do_not_check_pmic_quirk(const struct dmi_system_id *d) 304 { 305 ac_check_pmic = 0; 306 return 0; 307 } 308 309 static const struct dmi_system_id ac_dmi_table[] __initconst = { 310 { 311 /* Thinkpad e530 */ 312 .callback = thinkpad_e530_quirk, 313 .matches = { 314 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 315 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"), 316 }, 317 }, 318 { 319 /* ECS EF20EA */ 320 .callback = ac_do_not_check_pmic_quirk, 321 .matches = { 322 DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"), 323 }, 324 }, 325 { 326 /* Lenovo Ideapad Miix 320 */ 327 .callback = ac_do_not_check_pmic_quirk, 328 .matches = { 329 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"), 330 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "80XF"), 331 DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"), 332 }, 333 }, 334 {}, 335 }; 336 337 static int acpi_ac_add(struct acpi_device *device) 338 { 339 struct power_supply_config psy_cfg = {}; 340 int result = 0; 341 struct acpi_ac *ac = NULL; 342 343 344 if (!device) 345 return -EINVAL; 346 347 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); 348 if (!ac) 349 return -ENOMEM; 350 351 ac->device = device; 352 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); 353 strcpy(acpi_device_class(device), ACPI_AC_CLASS); 354 device->driver_data = ac; 355 356 result = acpi_ac_get_state(ac); 357 if (result) 358 goto end; 359 360 psy_cfg.drv_data = ac; 361 362 ac->charger_desc.name = acpi_device_bid(device); 363 #ifdef CONFIG_ACPI_PROCFS_POWER 364 result = acpi_ac_add_fs(ac); 365 if (result) 366 goto end; 367 #endif 368 ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS; 369 ac->charger_desc.properties = ac_props; 370 ac->charger_desc.num_properties = ARRAY_SIZE(ac_props); 371 ac->charger_desc.get_property = get_ac_property; 372 ac->charger = power_supply_register(&ac->device->dev, 373 &ac->charger_desc, &psy_cfg); 374 if (IS_ERR(ac->charger)) { 375 result = PTR_ERR(ac->charger); 376 goto end; 377 } 378 379 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 380 acpi_device_name(device), acpi_device_bid(device), 381 ac->state ? "on-line" : "off-line"); 382 383 ac->battery_nb.notifier_call = acpi_ac_battery_notify; 384 register_acpi_notifier(&ac->battery_nb); 385 end: 386 if (result) { 387 #ifdef CONFIG_ACPI_PROCFS_POWER 388 acpi_ac_remove_fs(ac); 389 #endif 390 kfree(ac); 391 } 392 393 return result; 394 } 395 396 #ifdef CONFIG_PM_SLEEP 397 static int acpi_ac_resume(struct device *dev) 398 { 399 struct acpi_ac *ac; 400 unsigned old_state; 401 402 if (!dev) 403 return -EINVAL; 404 405 ac = acpi_driver_data(to_acpi_device(dev)); 406 if (!ac) 407 return -EINVAL; 408 409 old_state = ac->state; 410 if (acpi_ac_get_state(ac)) 411 return 0; 412 if (old_state != ac->state) 413 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE); 414 return 0; 415 } 416 #else 417 #define acpi_ac_resume NULL 418 #endif 419 420 static int acpi_ac_remove(struct acpi_device *device) 421 { 422 struct acpi_ac *ac = NULL; 423 424 425 if (!device || !acpi_driver_data(device)) 426 return -EINVAL; 427 428 ac = acpi_driver_data(device); 429 430 power_supply_unregister(ac->charger); 431 unregister_acpi_notifier(&ac->battery_nb); 432 433 #ifdef CONFIG_ACPI_PROCFS_POWER 434 acpi_ac_remove_fs(ac); 435 #endif 436 437 kfree(ac); 438 439 return 0; 440 } 441 442 static int __init acpi_ac_init(void) 443 { 444 unsigned int i; 445 int result; 446 447 if (acpi_disabled) 448 return -ENODEV; 449 450 dmi_check_system(ac_dmi_table); 451 452 if (ac_check_pmic) { 453 for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++) 454 if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1", 455 acpi_ac_blacklist[i].hrv)) { 456 pr_info(PREFIX "AC: found native %s PMIC, not loading\n", 457 acpi_ac_blacklist[i].hid); 458 return -ENODEV; 459 } 460 } 461 462 #ifdef CONFIG_ACPI_PROCFS_POWER 463 acpi_ac_dir = acpi_lock_ac_dir(); 464 if (!acpi_ac_dir) 465 return -ENODEV; 466 #endif 467 468 469 result = acpi_bus_register_driver(&acpi_ac_driver); 470 if (result < 0) { 471 #ifdef CONFIG_ACPI_PROCFS_POWER 472 acpi_unlock_ac_dir(acpi_ac_dir); 473 #endif 474 return -ENODEV; 475 } 476 477 return 0; 478 } 479 480 static void __exit acpi_ac_exit(void) 481 { 482 acpi_bus_unregister_driver(&acpi_ac_driver); 483 #ifdef CONFIG_ACPI_PROCFS_POWER 484 acpi_unlock_ac_dir(acpi_ac_dir); 485 #endif 486 } 487 module_init(acpi_ac_init); 488 module_exit(acpi_ac_exit); 489