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 * You should have received a copy of the GNU General Public License along 20 * with this program; if not, write to the Free Software Foundation, Inc., 21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 22 * 23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 24 */ 25 26#include <linux/kernel.h> 27#include <linux/module.h> 28#include <linux/slab.h> 29#include <linux/init.h> 30#include <linux/types.h> 31#include <linux/dmi.h> 32#include <linux/delay.h> 33#ifdef CONFIG_ACPI_PROCFS_POWER 34#include <linux/proc_fs.h> 35#include <linux/seq_file.h> 36#endif 37#include <linux/platform_device.h> 38#include <linux/power_supply.h> 39#include <linux/acpi.h> 40#include "battery.h" 41 42#define PREFIX "ACPI: " 43 44#define ACPI_AC_CLASS "ac_adapter" 45#define ACPI_AC_DEVICE_NAME "AC Adapter" 46#define ACPI_AC_FILE_STATE "state" 47#define ACPI_AC_NOTIFY_STATUS 0x80 48#define ACPI_AC_STATUS_OFFLINE 0x00 49#define ACPI_AC_STATUS_ONLINE 0x01 50#define ACPI_AC_STATUS_UNKNOWN 0xFF 51 52#define _COMPONENT ACPI_AC_COMPONENT 53ACPI_MODULE_NAME("ac"); 54 55MODULE_AUTHOR("Paul Diefenbaugh"); 56MODULE_DESCRIPTION("ACPI AC Adapter Driver"); 57MODULE_LICENSE("GPL"); 58 59 60static int acpi_ac_add(struct acpi_device *device); 61static int acpi_ac_remove(struct acpi_device *device); 62static void acpi_ac_notify(struct acpi_device *device, u32 event); 63 64static const struct acpi_device_id ac_device_ids[] = { 65 {"ACPI0003", 0}, 66 {"", 0}, 67}; 68MODULE_DEVICE_TABLE(acpi, ac_device_ids); 69 70#ifdef CONFIG_PM_SLEEP 71static int acpi_ac_resume(struct device *dev); 72#endif 73static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume); 74 75#ifdef CONFIG_ACPI_PROCFS_POWER 76extern struct proc_dir_entry *acpi_lock_ac_dir(void); 77extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir); 78static int acpi_ac_open_fs(struct inode *inode, struct file *file); 79#endif 80 81 82static int ac_sleep_before_get_state_ms; 83 84static struct acpi_driver acpi_ac_driver = { 85 .name = "ac", 86 .class = ACPI_AC_CLASS, 87 .ids = ac_device_ids, 88 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, 89 .ops = { 90 .add = acpi_ac_add, 91 .remove = acpi_ac_remove, 92 .notify = acpi_ac_notify, 93 }, 94 .drv.pm = &acpi_ac_pm, 95}; 96 97struct acpi_ac { 98 struct power_supply charger; 99 struct acpi_device * device; 100 unsigned long long state; 101 struct notifier_block battery_nb; 102}; 103 104#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger) 105 106#ifdef CONFIG_ACPI_PROCFS_POWER 107static const struct file_operations acpi_ac_fops = { 108 .owner = THIS_MODULE, 109 .open = acpi_ac_open_fs, 110 .read = seq_read, 111 .llseek = seq_lseek, 112 .release = single_release, 113}; 114#endif 115 116/* -------------------------------------------------------------------------- 117 AC Adapter Management 118 -------------------------------------------------------------------------- */ 119 120static int acpi_ac_get_state(struct acpi_ac *ac) 121{ 122 acpi_status status = AE_OK; 123 124 if (!ac) 125 return -EINVAL; 126 127 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, 128 &ac->state); 129 if (ACPI_FAILURE(status)) { 130 ACPI_EXCEPTION((AE_INFO, status, 131 "Error reading AC Adapter state")); 132 ac->state = ACPI_AC_STATUS_UNKNOWN; 133 return -ENODEV; 134 } 135 136 return 0; 137} 138 139/* -------------------------------------------------------------------------- 140 sysfs I/F 141 -------------------------------------------------------------------------- */ 142static int get_ac_property(struct power_supply *psy, 143 enum power_supply_property psp, 144 union power_supply_propval *val) 145{ 146 struct acpi_ac *ac = to_acpi_ac(psy); 147 148 if (!ac) 149 return -ENODEV; 150 151 if (acpi_ac_get_state(ac)) 152 return -ENODEV; 153 154 switch (psp) { 155 case POWER_SUPPLY_PROP_ONLINE: 156 val->intval = ac->state; 157 break; 158 default: 159 return -EINVAL; 160 } 161 return 0; 162} 163 164static enum power_supply_property ac_props[] = { 165 POWER_SUPPLY_PROP_ONLINE, 166}; 167 168#ifdef CONFIG_ACPI_PROCFS_POWER 169/* -------------------------------------------------------------------------- 170 FS Interface (/proc) 171 -------------------------------------------------------------------------- */ 172 173static struct proc_dir_entry *acpi_ac_dir; 174 175static int acpi_ac_seq_show(struct seq_file *seq, void *offset) 176{ 177 struct acpi_ac *ac = seq->private; 178 179 180 if (!ac) 181 return 0; 182 183 if (acpi_ac_get_state(ac)) { 184 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); 185 return 0; 186 } 187 188 seq_puts(seq, "state: "); 189 switch (ac->state) { 190 case ACPI_AC_STATUS_OFFLINE: 191 seq_puts(seq, "off-line\n"); 192 break; 193 case ACPI_AC_STATUS_ONLINE: 194 seq_puts(seq, "on-line\n"); 195 break; 196 default: 197 seq_puts(seq, "unknown\n"); 198 break; 199 } 200 201 return 0; 202} 203 204static int acpi_ac_open_fs(struct inode *inode, struct file *file) 205{ 206 return single_open(file, acpi_ac_seq_show, PDE_DATA(inode)); 207} 208 209static int acpi_ac_add_fs(struct acpi_ac *ac) 210{ 211 struct proc_dir_entry *entry = NULL; 212 213 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded," 214 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n"); 215 if (!acpi_device_dir(ac->device)) { 216 acpi_device_dir(ac->device) = 217 proc_mkdir(acpi_device_bid(ac->device), acpi_ac_dir); 218 if (!acpi_device_dir(ac->device)) 219 return -ENODEV; 220 } 221 222 /* 'state' [R] */ 223 entry = proc_create_data(ACPI_AC_FILE_STATE, 224 S_IRUGO, acpi_device_dir(ac->device), 225 &acpi_ac_fops, ac); 226 if (!entry) 227 return -ENODEV; 228 return 0; 229} 230 231static int acpi_ac_remove_fs(struct acpi_ac *ac) 232{ 233 234 if (acpi_device_dir(ac->device)) { 235 remove_proc_entry(ACPI_AC_FILE_STATE, 236 acpi_device_dir(ac->device)); 237 remove_proc_entry(acpi_device_bid(ac->device), acpi_ac_dir); 238 acpi_device_dir(ac->device) = NULL; 239 } 240 241 return 0; 242} 243#endif 244 245/* -------------------------------------------------------------------------- 246 Driver Model 247 -------------------------------------------------------------------------- */ 248 249static void acpi_ac_notify(struct acpi_device *device, u32 event) 250{ 251 struct acpi_ac *ac = acpi_driver_data(device); 252 253 if (!ac) 254 return; 255 256 switch (event) { 257 default: 258 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 259 "Unsupported event [0x%x]\n", event)); 260 case ACPI_AC_NOTIFY_STATUS: 261 case ACPI_NOTIFY_BUS_CHECK: 262 case ACPI_NOTIFY_DEVICE_CHECK: 263 /* 264 * A buggy BIOS may notify AC first and then sleep for 265 * a specific time before doing actual operations in the 266 * EC event handler (_Qxx). This will cause the AC state 267 * reported by the ACPI event to be incorrect, so wait for a 268 * specific time for the EC event handler to make progress. 269 */ 270 if (ac_sleep_before_get_state_ms > 0) 271 msleep(ac_sleep_before_get_state_ms); 272 273 acpi_ac_get_state(ac); 274 acpi_bus_generate_netlink_event(device->pnp.device_class, 275 dev_name(&device->dev), event, 276 (u32) ac->state); 277 acpi_notifier_call_chain(device, event, (u32) ac->state); 278 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 279 } 280 281 return; 282} 283 284static int acpi_ac_battery_notify(struct notifier_block *nb, 285 unsigned long action, void *data) 286{ 287 struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb); 288 struct acpi_bus_event *event = (struct acpi_bus_event *)data; 289 290 /* 291 * On HP Pavilion dv6-6179er AC status notifications aren't triggered 292 * when adapter is plugged/unplugged. However, battery status 293 * notifcations are triggered when battery starts charging or 294 * discharging. Re-reading AC status triggers lost AC notifications, 295 * if AC status has changed. 296 */ 297 if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 && 298 event->type == ACPI_BATTERY_NOTIFY_STATUS) 299 acpi_ac_get_state(ac); 300 301 return NOTIFY_OK; 302} 303 304static int thinkpad_e530_quirk(const struct dmi_system_id *d) 305{ 306 ac_sleep_before_get_state_ms = 1000; 307 return 0; 308} 309 310static struct dmi_system_id ac_dmi_table[] = { 311 { 312 .callback = thinkpad_e530_quirk, 313 .ident = "thinkpad e530", 314 .matches = { 315 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 316 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"), 317 }, 318 }, 319 {}, 320}; 321 322static int acpi_ac_add(struct acpi_device *device) 323{ 324 int result = 0; 325 struct acpi_ac *ac = NULL; 326 327 328 if (!device) 329 return -EINVAL; 330 331 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); 332 if (!ac) 333 return -ENOMEM; 334 335 ac->device = device; 336 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); 337 strcpy(acpi_device_class(device), ACPI_AC_CLASS); 338 device->driver_data = ac; 339 340 result = acpi_ac_get_state(ac); 341 if (result) 342 goto end; 343 344 ac->charger.name = acpi_device_bid(device); 345#ifdef CONFIG_ACPI_PROCFS_POWER 346 result = acpi_ac_add_fs(ac); 347 if (result) 348 goto end; 349#endif 350 ac->charger.type = POWER_SUPPLY_TYPE_MAINS; 351 ac->charger.properties = ac_props; 352 ac->charger.num_properties = ARRAY_SIZE(ac_props); 353 ac->charger.get_property = get_ac_property; 354 result = power_supply_register(&ac->device->dev, &ac->charger); 355 if (result) 356 goto end; 357 358 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 359 acpi_device_name(device), acpi_device_bid(device), 360 ac->state ? "on-line" : "off-line"); 361 362 ac->battery_nb.notifier_call = acpi_ac_battery_notify; 363 register_acpi_notifier(&ac->battery_nb); 364end: 365 if (result) { 366#ifdef CONFIG_ACPI_PROCFS_POWER 367 acpi_ac_remove_fs(ac); 368#endif 369 kfree(ac); 370 } 371 372 dmi_check_system(ac_dmi_table); 373 return result; 374} 375 376#ifdef CONFIG_PM_SLEEP 377static int acpi_ac_resume(struct device *dev) 378{ 379 struct acpi_ac *ac; 380 unsigned old_state; 381 382 if (!dev) 383 return -EINVAL; 384 385 ac = acpi_driver_data(to_acpi_device(dev)); 386 if (!ac) 387 return -EINVAL; 388 389 old_state = ac->state; 390 if (acpi_ac_get_state(ac)) 391 return 0; 392 if (old_state != ac->state) 393 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 394 return 0; 395} 396#else 397#define acpi_ac_resume NULL 398#endif 399 400static int acpi_ac_remove(struct acpi_device *device) 401{ 402 struct acpi_ac *ac = NULL; 403 404 405 if (!device || !acpi_driver_data(device)) 406 return -EINVAL; 407 408 ac = acpi_driver_data(device); 409 410 if (ac->charger.dev) 411 power_supply_unregister(&ac->charger); 412 unregister_acpi_notifier(&ac->battery_nb); 413 414#ifdef CONFIG_ACPI_PROCFS_POWER 415 acpi_ac_remove_fs(ac); 416#endif 417 418 kfree(ac); 419 420 return 0; 421} 422 423static int __init acpi_ac_init(void) 424{ 425 int result; 426 427 if (acpi_disabled) 428 return -ENODEV; 429 430#ifdef CONFIG_ACPI_PROCFS_POWER 431 acpi_ac_dir = acpi_lock_ac_dir(); 432 if (!acpi_ac_dir) 433 return -ENODEV; 434#endif 435 436 437 result = acpi_bus_register_driver(&acpi_ac_driver); 438 if (result < 0) { 439#ifdef CONFIG_ACPI_PROCFS_POWER 440 acpi_unlock_ac_dir(acpi_ac_dir); 441#endif 442 return -ENODEV; 443 } 444 445 return 0; 446} 447 448static void __exit acpi_ac_exit(void) 449{ 450 acpi_bus_unregister_driver(&acpi_ac_driver); 451#ifdef CONFIG_ACPI_PROCFS_POWER 452 acpi_unlock_ac_dir(acpi_ac_dir); 453#endif 454} 455module_init(acpi_ac_init); 456module_exit(acpi_ac_exit); 457