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