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 "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 static int acpi_ac_open_fs(struct inode *inode, struct file *file); 86 #endif 87 88 89 static int ac_sleep_before_get_state_ms; 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 #ifdef CONFIG_ACPI_PROCFS_POWER 115 static const struct file_operations acpi_ac_fops = { 116 .owner = THIS_MODULE, 117 .open = acpi_ac_open_fs, 118 .read = seq_read, 119 .llseek = seq_lseek, 120 .release = single_release, 121 }; 122 #endif 123 124 /* -------------------------------------------------------------------------- 125 AC Adapter Management 126 -------------------------------------------------------------------------- */ 127 128 static int acpi_ac_get_state(struct acpi_ac *ac) 129 { 130 acpi_status status = AE_OK; 131 132 if (!ac) 133 return -EINVAL; 134 135 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, 136 &ac->state); 137 if (ACPI_FAILURE(status)) { 138 ACPI_EXCEPTION((AE_INFO, status, 139 "Error reading AC Adapter state")); 140 ac->state = ACPI_AC_STATUS_UNKNOWN; 141 return -ENODEV; 142 } 143 144 return 0; 145 } 146 147 /* -------------------------------------------------------------------------- 148 sysfs I/F 149 -------------------------------------------------------------------------- */ 150 static int get_ac_property(struct power_supply *psy, 151 enum power_supply_property psp, 152 union power_supply_propval *val) 153 { 154 struct acpi_ac *ac = to_acpi_ac(psy); 155 156 if (!ac) 157 return -ENODEV; 158 159 if (acpi_ac_get_state(ac)) 160 return -ENODEV; 161 162 switch (psp) { 163 case POWER_SUPPLY_PROP_ONLINE: 164 val->intval = ac->state; 165 break; 166 default: 167 return -EINVAL; 168 } 169 return 0; 170 } 171 172 static enum power_supply_property ac_props[] = { 173 POWER_SUPPLY_PROP_ONLINE, 174 }; 175 176 #ifdef CONFIG_ACPI_PROCFS_POWER 177 /* -------------------------------------------------------------------------- 178 FS Interface (/proc) 179 -------------------------------------------------------------------------- */ 180 181 static struct proc_dir_entry *acpi_ac_dir; 182 183 static int acpi_ac_seq_show(struct seq_file *seq, void *offset) 184 { 185 struct acpi_ac *ac = seq->private; 186 187 188 if (!ac) 189 return 0; 190 191 if (acpi_ac_get_state(ac)) { 192 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); 193 return 0; 194 } 195 196 seq_puts(seq, "state: "); 197 switch (ac->state) { 198 case ACPI_AC_STATUS_OFFLINE: 199 seq_puts(seq, "off-line\n"); 200 break; 201 case ACPI_AC_STATUS_ONLINE: 202 seq_puts(seq, "on-line\n"); 203 break; 204 default: 205 seq_puts(seq, "unknown\n"); 206 break; 207 } 208 209 return 0; 210 } 211 212 static int acpi_ac_open_fs(struct inode *inode, struct file *file) 213 { 214 return single_open(file, acpi_ac_seq_show, PDE_DATA(inode)); 215 } 216 217 static int acpi_ac_add_fs(struct acpi_ac *ac) 218 { 219 struct proc_dir_entry *entry = NULL; 220 221 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded," 222 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n"); 223 if (!acpi_device_dir(ac->device)) { 224 acpi_device_dir(ac->device) = 225 proc_mkdir(acpi_device_bid(ac->device), acpi_ac_dir); 226 if (!acpi_device_dir(ac->device)) 227 return -ENODEV; 228 } 229 230 /* 'state' [R] */ 231 entry = proc_create_data(ACPI_AC_FILE_STATE, 232 S_IRUGO, acpi_device_dir(ac->device), 233 &acpi_ac_fops, ac); 234 if (!entry) 235 return -ENODEV; 236 return 0; 237 } 238 239 static int acpi_ac_remove_fs(struct acpi_ac *ac) 240 { 241 242 if (acpi_device_dir(ac->device)) { 243 remove_proc_entry(ACPI_AC_FILE_STATE, 244 acpi_device_dir(ac->device)); 245 remove_proc_entry(acpi_device_bid(ac->device), acpi_ac_dir); 246 acpi_device_dir(ac->device) = NULL; 247 } 248 249 return 0; 250 } 251 #endif 252 253 /* -------------------------------------------------------------------------- 254 Driver Model 255 -------------------------------------------------------------------------- */ 256 257 static void acpi_ac_notify(struct acpi_device *device, u32 event) 258 { 259 struct acpi_ac *ac = acpi_driver_data(device); 260 261 if (!ac) 262 return; 263 264 switch (event) { 265 default: 266 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 267 "Unsupported event [0x%x]\n", event)); 268 /* fall through */ 269 case ACPI_AC_NOTIFY_STATUS: 270 case ACPI_NOTIFY_BUS_CHECK: 271 case ACPI_NOTIFY_DEVICE_CHECK: 272 /* 273 * A buggy BIOS may notify AC first and then sleep for 274 * a specific time before doing actual operations in the 275 * EC event handler (_Qxx). This will cause the AC state 276 * reported by the ACPI event to be incorrect, so wait for a 277 * specific time for the EC event handler to make progress. 278 */ 279 if (ac_sleep_before_get_state_ms > 0) 280 msleep(ac_sleep_before_get_state_ms); 281 282 acpi_ac_get_state(ac); 283 acpi_bus_generate_netlink_event(device->pnp.device_class, 284 dev_name(&device->dev), event, 285 (u32) ac->state); 286 acpi_notifier_call_chain(device, event, (u32) ac->state); 287 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE); 288 } 289 290 return; 291 } 292 293 static int acpi_ac_battery_notify(struct notifier_block *nb, 294 unsigned long action, void *data) 295 { 296 struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb); 297 struct acpi_bus_event *event = (struct acpi_bus_event *)data; 298 299 /* 300 * On HP Pavilion dv6-6179er AC status notifications aren't triggered 301 * when adapter is plugged/unplugged. However, battery status 302 * notifcations are triggered when battery starts charging or 303 * discharging. Re-reading AC status triggers lost AC notifications, 304 * if AC status has changed. 305 */ 306 if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 && 307 event->type == ACPI_BATTERY_NOTIFY_STATUS) 308 acpi_ac_get_state(ac); 309 310 return NOTIFY_OK; 311 } 312 313 static int thinkpad_e530_quirk(const struct dmi_system_id *d) 314 { 315 ac_sleep_before_get_state_ms = 1000; 316 return 0; 317 } 318 319 static const struct dmi_system_id ac_dmi_table[] = { 320 { 321 .callback = thinkpad_e530_quirk, 322 .ident = "thinkpad e530", 323 .matches = { 324 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 325 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"), 326 }, 327 }, 328 {}, 329 }; 330 331 static int acpi_ac_add(struct acpi_device *device) 332 { 333 struct power_supply_config psy_cfg = {}; 334 int result = 0; 335 struct acpi_ac *ac = NULL; 336 337 338 if (!device) 339 return -EINVAL; 340 341 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); 342 if (!ac) 343 return -ENOMEM; 344 345 ac->device = device; 346 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); 347 strcpy(acpi_device_class(device), ACPI_AC_CLASS); 348 device->driver_data = ac; 349 350 result = acpi_ac_get_state(ac); 351 if (result) 352 goto end; 353 354 psy_cfg.drv_data = ac; 355 356 ac->charger_desc.name = acpi_device_bid(device); 357 #ifdef CONFIG_ACPI_PROCFS_POWER 358 result = acpi_ac_add_fs(ac); 359 if (result) 360 goto end; 361 #endif 362 ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS; 363 ac->charger_desc.properties = ac_props; 364 ac->charger_desc.num_properties = ARRAY_SIZE(ac_props); 365 ac->charger_desc.get_property = get_ac_property; 366 ac->charger = power_supply_register(&ac->device->dev, 367 &ac->charger_desc, &psy_cfg); 368 if (IS_ERR(ac->charger)) { 369 result = PTR_ERR(ac->charger); 370 goto end; 371 } 372 373 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 374 acpi_device_name(device), acpi_device_bid(device), 375 ac->state ? "on-line" : "off-line"); 376 377 ac->battery_nb.notifier_call = acpi_ac_battery_notify; 378 register_acpi_notifier(&ac->battery_nb); 379 end: 380 if (result) { 381 #ifdef CONFIG_ACPI_PROCFS_POWER 382 acpi_ac_remove_fs(ac); 383 #endif 384 kfree(ac); 385 } 386 387 dmi_check_system(ac_dmi_table); 388 return result; 389 } 390 391 #ifdef CONFIG_PM_SLEEP 392 static int acpi_ac_resume(struct device *dev) 393 { 394 struct acpi_ac *ac; 395 unsigned old_state; 396 397 if (!dev) 398 return -EINVAL; 399 400 ac = acpi_driver_data(to_acpi_device(dev)); 401 if (!ac) 402 return -EINVAL; 403 404 old_state = ac->state; 405 if (acpi_ac_get_state(ac)) 406 return 0; 407 if (old_state != ac->state) 408 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE); 409 return 0; 410 } 411 #else 412 #define acpi_ac_resume NULL 413 #endif 414 415 static int acpi_ac_remove(struct acpi_device *device) 416 { 417 struct acpi_ac *ac = NULL; 418 419 420 if (!device || !acpi_driver_data(device)) 421 return -EINVAL; 422 423 ac = acpi_driver_data(device); 424 425 power_supply_unregister(ac->charger); 426 unregister_acpi_notifier(&ac->battery_nb); 427 428 #ifdef CONFIG_ACPI_PROCFS_POWER 429 acpi_ac_remove_fs(ac); 430 #endif 431 432 kfree(ac); 433 434 return 0; 435 } 436 437 static int __init acpi_ac_init(void) 438 { 439 unsigned int i; 440 int result; 441 442 if (acpi_disabled) 443 return -ENODEV; 444 445 for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++) 446 if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1", 447 acpi_ac_blacklist[i].hrv)) { 448 pr_info(PREFIX "AC: found native %s PMIC, not loading\n", 449 acpi_ac_blacklist[i].hid); 450 return -ENODEV; 451 } 452 453 #ifdef CONFIG_ACPI_PROCFS_POWER 454 acpi_ac_dir = acpi_lock_ac_dir(); 455 if (!acpi_ac_dir) 456 return -ENODEV; 457 #endif 458 459 460 result = acpi_bus_register_driver(&acpi_ac_driver); 461 if (result < 0) { 462 #ifdef CONFIG_ACPI_PROCFS_POWER 463 acpi_unlock_ac_dir(acpi_ac_dir); 464 #endif 465 return -ENODEV; 466 } 467 468 return 0; 469 } 470 471 static void __exit acpi_ac_exit(void) 472 { 473 acpi_bus_unregister_driver(&acpi_ac_driver); 474 #ifdef CONFIG_ACPI_PROCFS_POWER 475 acpi_unlock_ac_dir(acpi_ac_dir); 476 #endif 477 } 478 module_init(acpi_ac_init); 479 module_exit(acpi_ac_exit); 480