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/init.h> 29 #include <linux/types.h> 30 #ifdef CONFIG_ACPI_PROCFS_POWER 31 #include <linux/proc_fs.h> 32 #include <linux/seq_file.h> 33 #endif 34 #ifdef CONFIG_ACPI_SYSFS_POWER 35 #include <linux/power_supply.h> 36 #endif 37 #include <acpi/acpi_bus.h> 38 #include <acpi/acpi_drivers.h> 39 40 #define ACPI_AC_COMPONENT 0x00020000 41 #define ACPI_AC_CLASS "ac_adapter" 42 #define ACPI_AC_DEVICE_NAME "AC Adapter" 43 #define ACPI_AC_FILE_STATE "state" 44 #define ACPI_AC_NOTIFY_STATUS 0x80 45 #define ACPI_AC_STATUS_OFFLINE 0x00 46 #define ACPI_AC_STATUS_ONLINE 0x01 47 #define ACPI_AC_STATUS_UNKNOWN 0xFF 48 49 #define _COMPONENT ACPI_AC_COMPONENT 50 ACPI_MODULE_NAME("ac"); 51 52 MODULE_AUTHOR("Paul Diefenbaugh"); 53 MODULE_DESCRIPTION("ACPI AC Adapter Driver"); 54 MODULE_LICENSE("GPL"); 55 56 #ifdef CONFIG_ACPI_PROCFS_POWER 57 extern struct proc_dir_entry *acpi_lock_ac_dir(void); 58 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir); 59 static int acpi_ac_open_fs(struct inode *inode, struct file *file); 60 #endif 61 62 static int acpi_ac_add(struct acpi_device *device); 63 static int acpi_ac_remove(struct acpi_device *device, int type); 64 static int acpi_ac_resume(struct acpi_device *device); 65 66 const static struct acpi_device_id ac_device_ids[] = { 67 {"ACPI0003", 0}, 68 {"", 0}, 69 }; 70 MODULE_DEVICE_TABLE(acpi, ac_device_ids); 71 72 static struct acpi_driver acpi_ac_driver = { 73 .name = "ac", 74 .class = ACPI_AC_CLASS, 75 .ids = ac_device_ids, 76 .ops = { 77 .add = acpi_ac_add, 78 .remove = acpi_ac_remove, 79 .resume = acpi_ac_resume, 80 }, 81 }; 82 83 struct acpi_ac { 84 #ifdef CONFIG_ACPI_SYSFS_POWER 85 struct power_supply charger; 86 #endif 87 struct acpi_device * device; 88 unsigned long state; 89 }; 90 91 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger); 92 93 #ifdef CONFIG_ACPI_PROCFS_POWER 94 static const struct file_operations acpi_ac_fops = { 95 .open = acpi_ac_open_fs, 96 .read = seq_read, 97 .llseek = seq_lseek, 98 .release = single_release, 99 }; 100 #endif 101 #ifdef CONFIG_ACPI_SYSFS_POWER 102 static int get_ac_property(struct power_supply *psy, 103 enum power_supply_property psp, 104 union power_supply_propval *val) 105 { 106 struct acpi_ac *ac = to_acpi_ac(psy); 107 switch (psp) { 108 case POWER_SUPPLY_PROP_ONLINE: 109 val->intval = ac->state; 110 break; 111 default: 112 return -EINVAL; 113 } 114 return 0; 115 } 116 117 static enum power_supply_property ac_props[] = { 118 POWER_SUPPLY_PROP_ONLINE, 119 }; 120 #endif 121 /* -------------------------------------------------------------------------- 122 AC Adapter Management 123 -------------------------------------------------------------------------- */ 124 125 static int acpi_ac_get_state(struct acpi_ac *ac) 126 { 127 acpi_status status = AE_OK; 128 129 130 if (!ac) 131 return -EINVAL; 132 133 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state); 134 if (ACPI_FAILURE(status)) { 135 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state")); 136 ac->state = ACPI_AC_STATUS_UNKNOWN; 137 return -ENODEV; 138 } 139 140 return 0; 141 } 142 143 #ifdef CONFIG_ACPI_PROCFS_POWER 144 /* -------------------------------------------------------------------------- 145 FS Interface (/proc) 146 -------------------------------------------------------------------------- */ 147 148 static struct proc_dir_entry *acpi_ac_dir; 149 150 static int acpi_ac_seq_show(struct seq_file *seq, void *offset) 151 { 152 struct acpi_ac *ac = seq->private; 153 154 155 if (!ac) 156 return 0; 157 158 if (acpi_ac_get_state(ac)) { 159 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); 160 return 0; 161 } 162 163 seq_puts(seq, "state: "); 164 switch (ac->state) { 165 case ACPI_AC_STATUS_OFFLINE: 166 seq_puts(seq, "off-line\n"); 167 break; 168 case ACPI_AC_STATUS_ONLINE: 169 seq_puts(seq, "on-line\n"); 170 break; 171 default: 172 seq_puts(seq, "unknown\n"); 173 break; 174 } 175 176 return 0; 177 } 178 179 static int acpi_ac_open_fs(struct inode *inode, struct file *file) 180 { 181 return single_open(file, acpi_ac_seq_show, PDE(inode)->data); 182 } 183 184 static int acpi_ac_add_fs(struct acpi_device *device) 185 { 186 struct proc_dir_entry *entry = NULL; 187 188 189 if (!acpi_device_dir(device)) { 190 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 191 acpi_ac_dir); 192 if (!acpi_device_dir(device)) 193 return -ENODEV; 194 acpi_device_dir(device)->owner = THIS_MODULE; 195 } 196 197 /* 'state' [R] */ 198 entry = create_proc_entry(ACPI_AC_FILE_STATE, 199 S_IRUGO, acpi_device_dir(device)); 200 if (!entry) 201 return -ENODEV; 202 else { 203 entry->proc_fops = &acpi_ac_fops; 204 entry->data = acpi_driver_data(device); 205 entry->owner = THIS_MODULE; 206 } 207 208 return 0; 209 } 210 211 static int acpi_ac_remove_fs(struct acpi_device *device) 212 { 213 214 if (acpi_device_dir(device)) { 215 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device)); 216 217 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir); 218 acpi_device_dir(device) = NULL; 219 } 220 221 return 0; 222 } 223 #endif 224 225 /* -------------------------------------------------------------------------- 226 Driver Model 227 -------------------------------------------------------------------------- */ 228 229 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data) 230 { 231 struct acpi_ac *ac = data; 232 struct acpi_device *device = NULL; 233 234 235 if (!ac) 236 return; 237 238 device = ac->device; 239 switch (event) { 240 case ACPI_AC_NOTIFY_STATUS: 241 case ACPI_NOTIFY_BUS_CHECK: 242 case ACPI_NOTIFY_DEVICE_CHECK: 243 acpi_ac_get_state(ac); 244 acpi_bus_generate_proc_event(device, event, (u32) ac->state); 245 acpi_bus_generate_netlink_event(device->pnp.device_class, 246 device->dev.bus_id, event, 247 (u32) ac->state); 248 #ifdef CONFIG_ACPI_SYSFS_POWER 249 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 250 #endif 251 break; 252 default: 253 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 254 "Unsupported event [0x%x]\n", event)); 255 break; 256 } 257 258 return; 259 } 260 261 static int acpi_ac_add(struct acpi_device *device) 262 { 263 int result = 0; 264 acpi_status status = AE_OK; 265 struct acpi_ac *ac = NULL; 266 267 268 if (!device) 269 return -EINVAL; 270 271 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); 272 if (!ac) 273 return -ENOMEM; 274 275 ac->device = device; 276 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); 277 strcpy(acpi_device_class(device), ACPI_AC_CLASS); 278 acpi_driver_data(device) = ac; 279 280 result = acpi_ac_get_state(ac); 281 if (result) 282 goto end; 283 284 #ifdef CONFIG_ACPI_PROCFS_POWER 285 result = acpi_ac_add_fs(device); 286 #endif 287 if (result) 288 goto end; 289 #ifdef CONFIG_ACPI_SYSFS_POWER 290 ac->charger.name = acpi_device_bid(device); 291 ac->charger.type = POWER_SUPPLY_TYPE_MAINS; 292 ac->charger.properties = ac_props; 293 ac->charger.num_properties = ARRAY_SIZE(ac_props); 294 ac->charger.get_property = get_ac_property; 295 power_supply_register(&ac->device->dev, &ac->charger); 296 #endif 297 status = acpi_install_notify_handler(device->handle, 298 ACPI_ALL_NOTIFY, acpi_ac_notify, 299 ac); 300 if (ACPI_FAILURE(status)) { 301 result = -ENODEV; 302 goto end; 303 } 304 305 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 306 acpi_device_name(device), acpi_device_bid(device), 307 ac->state ? "on-line" : "off-line"); 308 309 end: 310 if (result) { 311 #ifdef CONFIG_ACPI_PROCFS_POWER 312 acpi_ac_remove_fs(device); 313 #endif 314 kfree(ac); 315 } 316 317 return result; 318 } 319 320 static int acpi_ac_resume(struct acpi_device *device) 321 { 322 struct acpi_ac *ac; 323 unsigned old_state; 324 if (!device || !acpi_driver_data(device)) 325 return -EINVAL; 326 ac = acpi_driver_data(device); 327 old_state = ac->state; 328 if (acpi_ac_get_state(ac)) 329 return 0; 330 #ifdef CONFIG_ACPI_SYSFS_POWER 331 if (old_state != ac->state) 332 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 333 #endif 334 return 0; 335 } 336 337 static int acpi_ac_remove(struct acpi_device *device, int type) 338 { 339 acpi_status status = AE_OK; 340 struct acpi_ac *ac = NULL; 341 342 343 if (!device || !acpi_driver_data(device)) 344 return -EINVAL; 345 346 ac = acpi_driver_data(device); 347 348 status = acpi_remove_notify_handler(device->handle, 349 ACPI_ALL_NOTIFY, acpi_ac_notify); 350 #ifdef CONFIG_ACPI_SYSFS_POWER 351 if (ac->charger.dev) 352 power_supply_unregister(&ac->charger); 353 #endif 354 #ifdef CONFIG_ACPI_PROCFS_POWER 355 acpi_ac_remove_fs(device); 356 #endif 357 358 kfree(ac); 359 360 return 0; 361 } 362 363 static int __init acpi_ac_init(void) 364 { 365 int result; 366 367 if (acpi_disabled) 368 return -ENODEV; 369 370 #ifdef CONFIG_ACPI_PROCFS_POWER 371 acpi_ac_dir = acpi_lock_ac_dir(); 372 if (!acpi_ac_dir) 373 return -ENODEV; 374 #endif 375 376 result = acpi_bus_register_driver(&acpi_ac_driver); 377 if (result < 0) { 378 #ifdef CONFIG_ACPI_PROCFS_POWER 379 acpi_unlock_ac_dir(acpi_ac_dir); 380 #endif 381 return -ENODEV; 382 } 383 384 return 0; 385 } 386 387 static void __exit acpi_ac_exit(void) 388 { 389 390 acpi_bus_unregister_driver(&acpi_ac_driver); 391 392 #ifdef CONFIG_ACPI_PROCFS_POWER 393 acpi_unlock_ac_dir(acpi_ac_dir); 394 #endif 395 396 return; 397 } 398 399 module_init(acpi_ac_init); 400 module_exit(acpi_ac_exit); 401