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 static const struct acpi_device_id ac_device_ids[] = { 61 {"ACPI0003", 0}, 62 {"", 0}, 63 }; 64 MODULE_DEVICE_TABLE(acpi, ac_device_ids); 65 66 #ifdef CONFIG_PM_SLEEP 67 static int acpi_ac_resume(struct device *dev); 68 #endif 69 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume); 70 71 #ifdef CONFIG_ACPI_PROCFS_POWER 72 extern struct proc_dir_entry *acpi_lock_ac_dir(void); 73 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir); 74 static int acpi_ac_open_fs(struct inode *inode, struct file *file); 75 #endif 76 77 78 static int ac_sleep_before_get_state_ms; 79 80 static struct acpi_driver acpi_ac_driver = { 81 .name = "ac", 82 .class = ACPI_AC_CLASS, 83 .ids = ac_device_ids, 84 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, 85 .ops = { 86 .add = acpi_ac_add, 87 .remove = acpi_ac_remove, 88 .notify = acpi_ac_notify, 89 }, 90 .drv.pm = &acpi_ac_pm, 91 }; 92 93 struct acpi_ac { 94 struct power_supply *charger; 95 struct power_supply_desc charger_desc; 96 struct acpi_device * device; 97 unsigned long long state; 98 struct notifier_block battery_nb; 99 }; 100 101 #define to_acpi_ac(x) power_supply_get_drvdata(x) 102 103 #ifdef CONFIG_ACPI_PROCFS_POWER 104 static const struct file_operations acpi_ac_fops = { 105 .owner = THIS_MODULE, 106 .open = acpi_ac_open_fs, 107 .read = seq_read, 108 .llseek = seq_lseek, 109 .release = single_release, 110 }; 111 #endif 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_open_fs(struct inode *inode, struct file *file) 202 { 203 return single_open(file, acpi_ac_seq_show, PDE_DATA(inode)); 204 } 205 206 static int acpi_ac_add_fs(struct acpi_ac *ac) 207 { 208 struct proc_dir_entry *entry = NULL; 209 210 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded," 211 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n"); 212 if (!acpi_device_dir(ac->device)) { 213 acpi_device_dir(ac->device) = 214 proc_mkdir(acpi_device_bid(ac->device), acpi_ac_dir); 215 if (!acpi_device_dir(ac->device)) 216 return -ENODEV; 217 } 218 219 /* 'state' [R] */ 220 entry = proc_create_data(ACPI_AC_FILE_STATE, 221 S_IRUGO, acpi_device_dir(ac->device), 222 &acpi_ac_fops, ac); 223 if (!entry) 224 return -ENODEV; 225 return 0; 226 } 227 228 static int acpi_ac_remove_fs(struct acpi_ac *ac) 229 { 230 231 if (acpi_device_dir(ac->device)) { 232 remove_proc_entry(ACPI_AC_FILE_STATE, 233 acpi_device_dir(ac->device)); 234 remove_proc_entry(acpi_device_bid(ac->device), acpi_ac_dir); 235 acpi_device_dir(ac->device) = NULL; 236 } 237 238 return 0; 239 } 240 #endif 241 242 /* -------------------------------------------------------------------------- 243 Driver Model 244 -------------------------------------------------------------------------- */ 245 246 static void acpi_ac_notify(struct acpi_device *device, u32 event) 247 { 248 struct acpi_ac *ac = acpi_driver_data(device); 249 250 if (!ac) 251 return; 252 253 switch (event) { 254 default: 255 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 256 "Unsupported event [0x%x]\n", event)); 257 case ACPI_AC_NOTIFY_STATUS: 258 case ACPI_NOTIFY_BUS_CHECK: 259 case ACPI_NOTIFY_DEVICE_CHECK: 260 /* 261 * A buggy BIOS may notify AC first and then sleep for 262 * a specific time before doing actual operations in the 263 * EC event handler (_Qxx). This will cause the AC state 264 * reported by the ACPI event to be incorrect, so wait for a 265 * specific time for the EC event handler to make progress. 266 */ 267 if (ac_sleep_before_get_state_ms > 0) 268 msleep(ac_sleep_before_get_state_ms); 269 270 acpi_ac_get_state(ac); 271 acpi_bus_generate_netlink_event(device->pnp.device_class, 272 dev_name(&device->dev), event, 273 (u32) ac->state); 274 acpi_notifier_call_chain(device, event, (u32) ac->state); 275 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE); 276 } 277 278 return; 279 } 280 281 static int acpi_ac_battery_notify(struct notifier_block *nb, 282 unsigned long action, void *data) 283 { 284 struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb); 285 struct acpi_bus_event *event = (struct acpi_bus_event *)data; 286 287 /* 288 * On HP Pavilion dv6-6179er AC status notifications aren't triggered 289 * when adapter is plugged/unplugged. However, battery status 290 * notifcations are triggered when battery starts charging or 291 * discharging. Re-reading AC status triggers lost AC notifications, 292 * if AC status has changed. 293 */ 294 if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 && 295 event->type == ACPI_BATTERY_NOTIFY_STATUS) 296 acpi_ac_get_state(ac); 297 298 return NOTIFY_OK; 299 } 300 301 static int thinkpad_e530_quirk(const struct dmi_system_id *d) 302 { 303 ac_sleep_before_get_state_ms = 1000; 304 return 0; 305 } 306 307 static const struct dmi_system_id ac_dmi_table[] = { 308 { 309 .callback = thinkpad_e530_quirk, 310 .ident = "thinkpad e530", 311 .matches = { 312 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 313 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"), 314 }, 315 }, 316 {}, 317 }; 318 319 static int acpi_ac_add(struct acpi_device *device) 320 { 321 struct power_supply_config psy_cfg = {}; 322 int result = 0; 323 struct acpi_ac *ac = NULL; 324 325 326 if (!device) 327 return -EINVAL; 328 329 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); 330 if (!ac) 331 return -ENOMEM; 332 333 ac->device = device; 334 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); 335 strcpy(acpi_device_class(device), ACPI_AC_CLASS); 336 device->driver_data = ac; 337 338 result = acpi_ac_get_state(ac); 339 if (result) 340 goto end; 341 342 psy_cfg.drv_data = ac; 343 344 ac->charger_desc.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_desc.type = POWER_SUPPLY_TYPE_MAINS; 351 ac->charger_desc.properties = ac_props; 352 ac->charger_desc.num_properties = ARRAY_SIZE(ac_props); 353 ac->charger_desc.get_property = get_ac_property; 354 ac->charger = power_supply_register(&ac->device->dev, 355 &ac->charger_desc, &psy_cfg); 356 if (IS_ERR(ac->charger)) { 357 result = PTR_ERR(ac->charger); 358 goto end; 359 } 360 361 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 362 acpi_device_name(device), acpi_device_bid(device), 363 ac->state ? "on-line" : "off-line"); 364 365 ac->battery_nb.notifier_call = acpi_ac_battery_notify; 366 register_acpi_notifier(&ac->battery_nb); 367 end: 368 if (result) { 369 #ifdef CONFIG_ACPI_PROCFS_POWER 370 acpi_ac_remove_fs(ac); 371 #endif 372 kfree(ac); 373 } 374 375 dmi_check_system(ac_dmi_table); 376 return result; 377 } 378 379 #ifdef CONFIG_PM_SLEEP 380 static int acpi_ac_resume(struct device *dev) 381 { 382 struct acpi_ac *ac; 383 unsigned old_state; 384 385 if (!dev) 386 return -EINVAL; 387 388 ac = acpi_driver_data(to_acpi_device(dev)); 389 if (!ac) 390 return -EINVAL; 391 392 old_state = ac->state; 393 if (acpi_ac_get_state(ac)) 394 return 0; 395 if (old_state != ac->state) 396 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE); 397 return 0; 398 } 399 #else 400 #define acpi_ac_resume NULL 401 #endif 402 403 static int acpi_ac_remove(struct acpi_device *device) 404 { 405 struct acpi_ac *ac = NULL; 406 407 408 if (!device || !acpi_driver_data(device)) 409 return -EINVAL; 410 411 ac = acpi_driver_data(device); 412 413 power_supply_unregister(ac->charger); 414 unregister_acpi_notifier(&ac->battery_nb); 415 416 #ifdef CONFIG_ACPI_PROCFS_POWER 417 acpi_ac_remove_fs(ac); 418 #endif 419 420 kfree(ac); 421 422 return 0; 423 } 424 425 static int __init acpi_ac_init(void) 426 { 427 int result; 428 429 if (acpi_disabled) 430 return -ENODEV; 431 432 #ifdef CONFIG_ACPI_PROCFS_POWER 433 acpi_ac_dir = acpi_lock_ac_dir(); 434 if (!acpi_ac_dir) 435 return -ENODEV; 436 #endif 437 438 439 result = acpi_bus_register_driver(&acpi_ac_driver); 440 if (result < 0) { 441 #ifdef CONFIG_ACPI_PROCFS_POWER 442 acpi_unlock_ac_dir(acpi_ac_dir); 443 #endif 444 return -ENODEV; 445 } 446 447 return 0; 448 } 449 450 static void __exit acpi_ac_exit(void) 451 { 452 acpi_bus_unregister_driver(&acpi_ac_driver); 453 #ifdef CONFIG_ACPI_PROCFS_POWER 454 acpi_unlock_ac_dir(acpi_ac_dir); 455 #endif 456 } 457 module_init(acpi_ac_init); 458 module_exit(acpi_ac_exit); 459