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