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_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 #ifdef CONFIG_ACPI_PROCFS_POWER 56 extern struct proc_dir_entry *acpi_lock_ac_dir(void); 57 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir); 58 static int acpi_ac_open_fs(struct inode *inode, struct file *file); 59 #endif 60 61 static int acpi_ac_add(struct acpi_device *device); 62 static int acpi_ac_remove(struct acpi_device *device, int type); 63 static int acpi_ac_resume(struct acpi_device *device); 64 65 static const struct acpi_device_id ac_device_ids[] = { 66 {"ACPI0003", 0}, 67 {"", 0}, 68 }; 69 MODULE_DEVICE_TABLE(acpi, ac_device_ids); 70 71 static struct acpi_driver acpi_ac_driver = { 72 .name = "ac", 73 .class = ACPI_AC_CLASS, 74 .ids = ac_device_ids, 75 .ops = { 76 .add = acpi_ac_add, 77 .remove = acpi_ac_remove, 78 .resume = acpi_ac_resume, 79 }, 80 }; 81 82 struct acpi_ac { 83 #ifdef CONFIG_ACPI_SYSFS_POWER 84 struct power_supply charger; 85 #endif 86 struct acpi_device * device; 87 unsigned long long state; 88 }; 89 90 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger); 91 92 #ifdef CONFIG_ACPI_PROCFS_POWER 93 static const struct file_operations acpi_ac_fops = { 94 .owner = THIS_MODULE, 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 } 195 196 /* 'state' [R] */ 197 entry = proc_create_data(ACPI_AC_FILE_STATE, 198 S_IRUGO, acpi_device_dir(device), 199 &acpi_ac_fops, acpi_driver_data(device)); 200 if (!entry) 201 return -ENODEV; 202 return 0; 203 } 204 205 static int acpi_ac_remove_fs(struct acpi_device *device) 206 { 207 208 if (acpi_device_dir(device)) { 209 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device)); 210 211 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir); 212 acpi_device_dir(device) = NULL; 213 } 214 215 return 0; 216 } 217 #endif 218 219 /* -------------------------------------------------------------------------- 220 Driver Model 221 -------------------------------------------------------------------------- */ 222 223 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data) 224 { 225 struct acpi_ac *ac = data; 226 struct acpi_device *device = NULL; 227 228 229 if (!ac) 230 return; 231 232 device = ac->device; 233 switch (event) { 234 default: 235 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 236 "Unsupported event [0x%x]\n", event)); 237 case ACPI_AC_NOTIFY_STATUS: 238 case ACPI_NOTIFY_BUS_CHECK: 239 case ACPI_NOTIFY_DEVICE_CHECK: 240 acpi_ac_get_state(ac); 241 acpi_bus_generate_proc_event(device, event, (u32) ac->state); 242 acpi_bus_generate_netlink_event(device->pnp.device_class, 243 dev_name(&device->dev), event, 244 (u32) ac->state); 245 #ifdef CONFIG_ACPI_SYSFS_POWER 246 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 247 #endif 248 } 249 250 return; 251 } 252 253 static int acpi_ac_add(struct acpi_device *device) 254 { 255 int result = 0; 256 acpi_status status = AE_OK; 257 struct acpi_ac *ac = NULL; 258 259 260 if (!device) 261 return -EINVAL; 262 263 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); 264 if (!ac) 265 return -ENOMEM; 266 267 ac->device = device; 268 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); 269 strcpy(acpi_device_class(device), ACPI_AC_CLASS); 270 device->driver_data = ac; 271 272 result = acpi_ac_get_state(ac); 273 if (result) 274 goto end; 275 276 #ifdef CONFIG_ACPI_PROCFS_POWER 277 result = acpi_ac_add_fs(device); 278 #endif 279 if (result) 280 goto end; 281 #ifdef CONFIG_ACPI_SYSFS_POWER 282 ac->charger.name = acpi_device_bid(device); 283 ac->charger.type = POWER_SUPPLY_TYPE_MAINS; 284 ac->charger.properties = ac_props; 285 ac->charger.num_properties = ARRAY_SIZE(ac_props); 286 ac->charger.get_property = get_ac_property; 287 power_supply_register(&ac->device->dev, &ac->charger); 288 #endif 289 status = acpi_install_notify_handler(device->handle, 290 ACPI_ALL_NOTIFY, acpi_ac_notify, 291 ac); 292 if (ACPI_FAILURE(status)) { 293 result = -ENODEV; 294 goto end; 295 } 296 297 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 298 acpi_device_name(device), acpi_device_bid(device), 299 ac->state ? "on-line" : "off-line"); 300 301 end: 302 if (result) { 303 #ifdef CONFIG_ACPI_PROCFS_POWER 304 acpi_ac_remove_fs(device); 305 #endif 306 kfree(ac); 307 } 308 309 return result; 310 } 311 312 static int acpi_ac_resume(struct acpi_device *device) 313 { 314 struct acpi_ac *ac; 315 unsigned old_state; 316 if (!device || !acpi_driver_data(device)) 317 return -EINVAL; 318 ac = acpi_driver_data(device); 319 old_state = ac->state; 320 if (acpi_ac_get_state(ac)) 321 return 0; 322 #ifdef CONFIG_ACPI_SYSFS_POWER 323 if (old_state != ac->state) 324 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 325 #endif 326 return 0; 327 } 328 329 static int acpi_ac_remove(struct acpi_device *device, int type) 330 { 331 acpi_status status = AE_OK; 332 struct acpi_ac *ac = NULL; 333 334 335 if (!device || !acpi_driver_data(device)) 336 return -EINVAL; 337 338 ac = acpi_driver_data(device); 339 340 status = acpi_remove_notify_handler(device->handle, 341 ACPI_ALL_NOTIFY, acpi_ac_notify); 342 #ifdef CONFIG_ACPI_SYSFS_POWER 343 if (ac->charger.dev) 344 power_supply_unregister(&ac->charger); 345 #endif 346 #ifdef CONFIG_ACPI_PROCFS_POWER 347 acpi_ac_remove_fs(device); 348 #endif 349 350 kfree(ac); 351 352 return 0; 353 } 354 355 static int __init acpi_ac_init(void) 356 { 357 int result; 358 359 if (acpi_disabled) 360 return -ENODEV; 361 362 #ifdef CONFIG_ACPI_PROCFS_POWER 363 acpi_ac_dir = acpi_lock_ac_dir(); 364 if (!acpi_ac_dir) 365 return -ENODEV; 366 #endif 367 368 result = acpi_bus_register_driver(&acpi_ac_driver); 369 if (result < 0) { 370 #ifdef CONFIG_ACPI_PROCFS_POWER 371 acpi_unlock_ac_dir(acpi_ac_dir); 372 #endif 373 return -ENODEV; 374 } 375 376 return 0; 377 } 378 379 static void __exit acpi_ac_exit(void) 380 { 381 382 acpi_bus_unregister_driver(&acpi_ac_driver); 383 384 #ifdef CONFIG_ACPI_PROCFS_POWER 385 acpi_unlock_ac_dir(acpi_ac_dir); 386 #endif 387 388 return; 389 } 390 391 module_init(acpi_ac_init); 392 module_exit(acpi_ac_exit); 393