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/power_supply.h> 38 #include <acpi/acpi_bus.h> 39 #include <acpi/acpi_drivers.h> 40 41 #define PREFIX "ACPI: " 42 43 #define ACPI_AC_CLASS "ac_adapter" 44 #define ACPI_AC_DEVICE_NAME "AC Adapter" 45 #define ACPI_AC_FILE_STATE "state" 46 #define ACPI_AC_NOTIFY_STATUS 0x80 47 #define ACPI_AC_STATUS_OFFLINE 0x00 48 #define ACPI_AC_STATUS_ONLINE 0x01 49 #define ACPI_AC_STATUS_UNKNOWN 0xFF 50 51 #define _COMPONENT ACPI_AC_COMPONENT 52 ACPI_MODULE_NAME("ac"); 53 54 MODULE_AUTHOR("Paul Diefenbaugh"); 55 MODULE_DESCRIPTION("ACPI AC Adapter Driver"); 56 MODULE_LICENSE("GPL"); 57 58 #ifdef CONFIG_ACPI_PROCFS_POWER 59 extern struct proc_dir_entry *acpi_lock_ac_dir(void); 60 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir); 61 static int acpi_ac_open_fs(struct inode *inode, struct file *file); 62 #endif 63 64 static int acpi_ac_add(struct acpi_device *device); 65 static int acpi_ac_remove(struct acpi_device *device); 66 static void acpi_ac_notify(struct acpi_device *device, u32 event); 67 68 static const struct acpi_device_id ac_device_ids[] = { 69 {"ACPI0003", 0}, 70 {"", 0}, 71 }; 72 MODULE_DEVICE_TABLE(acpi, ac_device_ids); 73 74 #ifdef CONFIG_PM_SLEEP 75 static int acpi_ac_resume(struct device *dev); 76 #endif 77 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume); 78 79 static int ac_sleep_before_get_state_ms; 80 81 static struct acpi_driver acpi_ac_driver = { 82 .name = "ac", 83 .class = ACPI_AC_CLASS, 84 .ids = ac_device_ids, 85 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, 86 .ops = { 87 .add = acpi_ac_add, 88 .remove = acpi_ac_remove, 89 .notify = acpi_ac_notify, 90 }, 91 .drv.pm = &acpi_ac_pm, 92 }; 93 94 struct acpi_ac { 95 struct power_supply charger; 96 struct acpi_device * device; 97 unsigned long long state; 98 }; 99 100 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger) 101 102 #ifdef CONFIG_ACPI_PROCFS_POWER 103 static const struct file_operations acpi_ac_fops = { 104 .owner = THIS_MODULE, 105 .open = acpi_ac_open_fs, 106 .read = seq_read, 107 .llseek = seq_lseek, 108 .release = single_release, 109 }; 110 #endif 111 112 /* -------------------------------------------------------------------------- 113 AC Adapter Management 114 -------------------------------------------------------------------------- */ 115 116 static int acpi_ac_get_state(struct acpi_ac *ac) 117 { 118 acpi_status status = AE_OK; 119 120 121 if (!ac) 122 return -EINVAL; 123 124 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state); 125 if (ACPI_FAILURE(status)) { 126 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state")); 127 ac->state = ACPI_AC_STATUS_UNKNOWN; 128 return -ENODEV; 129 } 130 131 return 0; 132 } 133 134 /* -------------------------------------------------------------------------- 135 sysfs I/F 136 -------------------------------------------------------------------------- */ 137 static int get_ac_property(struct power_supply *psy, 138 enum power_supply_property psp, 139 union power_supply_propval *val) 140 { 141 struct acpi_ac *ac = to_acpi_ac(psy); 142 143 if (!ac) 144 return -ENODEV; 145 146 if (acpi_ac_get_state(ac)) 147 return -ENODEV; 148 149 switch (psp) { 150 case POWER_SUPPLY_PROP_ONLINE: 151 val->intval = ac->state; 152 break; 153 default: 154 return -EINVAL; 155 } 156 return 0; 157 } 158 159 static enum power_supply_property ac_props[] = { 160 POWER_SUPPLY_PROP_ONLINE, 161 }; 162 163 #ifdef CONFIG_ACPI_PROCFS_POWER 164 /* -------------------------------------------------------------------------- 165 FS Interface (/proc) 166 -------------------------------------------------------------------------- */ 167 168 static struct proc_dir_entry *acpi_ac_dir; 169 170 static int acpi_ac_seq_show(struct seq_file *seq, void *offset) 171 { 172 struct acpi_ac *ac = seq->private; 173 174 175 if (!ac) 176 return 0; 177 178 if (acpi_ac_get_state(ac)) { 179 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); 180 return 0; 181 } 182 183 seq_puts(seq, "state: "); 184 switch (ac->state) { 185 case ACPI_AC_STATUS_OFFLINE: 186 seq_puts(seq, "off-line\n"); 187 break; 188 case ACPI_AC_STATUS_ONLINE: 189 seq_puts(seq, "on-line\n"); 190 break; 191 default: 192 seq_puts(seq, "unknown\n"); 193 break; 194 } 195 196 return 0; 197 } 198 199 static int acpi_ac_open_fs(struct inode *inode, struct file *file) 200 { 201 return single_open(file, acpi_ac_seq_show, PDE_DATA(inode)); 202 } 203 204 static int acpi_ac_add_fs(struct acpi_device *device) 205 { 206 struct proc_dir_entry *entry = NULL; 207 208 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded," 209 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n"); 210 if (!acpi_device_dir(device)) { 211 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 212 acpi_ac_dir); 213 if (!acpi_device_dir(device)) 214 return -ENODEV; 215 } 216 217 /* 'state' [R] */ 218 entry = proc_create_data(ACPI_AC_FILE_STATE, 219 S_IRUGO, acpi_device_dir(device), 220 &acpi_ac_fops, acpi_driver_data(device)); 221 if (!entry) 222 return -ENODEV; 223 return 0; 224 } 225 226 static int acpi_ac_remove_fs(struct acpi_device *device) 227 { 228 229 if (acpi_device_dir(device)) { 230 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device)); 231 232 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir); 233 acpi_device_dir(device) = NULL; 234 } 235 236 return 0; 237 } 238 #endif 239 240 /* -------------------------------------------------------------------------- 241 Driver Model 242 -------------------------------------------------------------------------- */ 243 244 static void acpi_ac_notify(struct acpi_device *device, u32 event) 245 { 246 struct acpi_ac *ac = acpi_driver_data(device); 247 248 249 if (!ac) 250 return; 251 252 switch (event) { 253 default: 254 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 255 "Unsupported event [0x%x]\n", event)); 256 case ACPI_AC_NOTIFY_STATUS: 257 case ACPI_NOTIFY_BUS_CHECK: 258 case ACPI_NOTIFY_DEVICE_CHECK: 259 /* 260 * A buggy BIOS may notify AC first and then sleep for 261 * a specific time before doing actual operations in the 262 * EC event handler (_Qxx). This will cause the AC state 263 * reported by the ACPI event to be incorrect, so wait for a 264 * specific time for the EC event handler to make progress. 265 */ 266 if (ac_sleep_before_get_state_ms > 0) 267 msleep(ac_sleep_before_get_state_ms); 268 269 acpi_ac_get_state(ac); 270 acpi_bus_generate_netlink_event(device->pnp.device_class, 271 dev_name(&device->dev), event, 272 (u32) ac->state); 273 acpi_notifier_call_chain(device, event, (u32) ac->state); 274 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 275 } 276 277 return; 278 } 279 280 static int thinkpad_e530_quirk(const struct dmi_system_id *d) 281 { 282 ac_sleep_before_get_state_ms = 1000; 283 return 0; 284 } 285 286 static struct dmi_system_id ac_dmi_table[] = { 287 { 288 .callback = thinkpad_e530_quirk, 289 .ident = "thinkpad e530", 290 .matches = { 291 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 292 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"), 293 }, 294 }, 295 {}, 296 }; 297 298 static int acpi_ac_add(struct acpi_device *device) 299 { 300 int result = 0; 301 struct acpi_ac *ac = NULL; 302 303 304 if (!device) 305 return -EINVAL; 306 307 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); 308 if (!ac) 309 return -ENOMEM; 310 311 ac->device = device; 312 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); 313 strcpy(acpi_device_class(device), ACPI_AC_CLASS); 314 device->driver_data = ac; 315 316 result = acpi_ac_get_state(ac); 317 if (result) 318 goto end; 319 320 #ifdef CONFIG_ACPI_PROCFS_POWER 321 result = acpi_ac_add_fs(device); 322 #endif 323 if (result) 324 goto end; 325 ac->charger.name = acpi_device_bid(device); 326 ac->charger.type = POWER_SUPPLY_TYPE_MAINS; 327 ac->charger.properties = ac_props; 328 ac->charger.num_properties = ARRAY_SIZE(ac_props); 329 ac->charger.get_property = get_ac_property; 330 result = power_supply_register(&ac->device->dev, &ac->charger); 331 if (result) 332 goto end; 333 334 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 335 acpi_device_name(device), acpi_device_bid(device), 336 ac->state ? "on-line" : "off-line"); 337 338 end: 339 if (result) { 340 #ifdef CONFIG_ACPI_PROCFS_POWER 341 acpi_ac_remove_fs(device); 342 #endif 343 kfree(ac); 344 } 345 346 dmi_check_system(ac_dmi_table); 347 return result; 348 } 349 350 #ifdef CONFIG_PM_SLEEP 351 static int acpi_ac_resume(struct device *dev) 352 { 353 struct acpi_ac *ac; 354 unsigned old_state; 355 356 if (!dev) 357 return -EINVAL; 358 359 ac = acpi_driver_data(to_acpi_device(dev)); 360 if (!ac) 361 return -EINVAL; 362 363 old_state = ac->state; 364 if (acpi_ac_get_state(ac)) 365 return 0; 366 if (old_state != ac->state) 367 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 368 return 0; 369 } 370 #endif 371 372 static int acpi_ac_remove(struct acpi_device *device) 373 { 374 struct acpi_ac *ac = NULL; 375 376 377 if (!device || !acpi_driver_data(device)) 378 return -EINVAL; 379 380 ac = acpi_driver_data(device); 381 382 if (ac->charger.dev) 383 power_supply_unregister(&ac->charger); 384 #ifdef CONFIG_ACPI_PROCFS_POWER 385 acpi_ac_remove_fs(device); 386 #endif 387 388 kfree(ac); 389 390 return 0; 391 } 392 393 static int __init acpi_ac_init(void) 394 { 395 int result; 396 397 if (acpi_disabled) 398 return -ENODEV; 399 400 #ifdef CONFIG_ACPI_PROCFS_POWER 401 acpi_ac_dir = acpi_lock_ac_dir(); 402 if (!acpi_ac_dir) 403 return -ENODEV; 404 #endif 405 406 result = acpi_bus_register_driver(&acpi_ac_driver); 407 if (result < 0) { 408 #ifdef CONFIG_ACPI_PROCFS_POWER 409 acpi_unlock_ac_dir(acpi_ac_dir); 410 #endif 411 return -ENODEV; 412 } 413 414 return 0; 415 } 416 417 static void __exit acpi_ac_exit(void) 418 { 419 420 acpi_bus_unregister_driver(&acpi_ac_driver); 421 422 #ifdef CONFIG_ACPI_PROCFS_POWER 423 acpi_unlock_ac_dir(acpi_ac_dir); 424 #endif 425 426 return; 427 } 428 429 module_init(acpi_ac_init); 430 module_exit(acpi_ac_exit); 431