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