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 static void acpi_ac_notify(struct acpi_device *device, u32 event); 65 66 static const 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 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, 77 .ops = { 78 .add = acpi_ac_add, 79 .remove = acpi_ac_remove, 80 .resume = acpi_ac_resume, 81 .notify = acpi_ac_notify, 82 }, 83 }; 84 85 struct acpi_ac { 86 #ifdef CONFIG_ACPI_SYSFS_POWER 87 struct power_supply charger; 88 #endif 89 struct acpi_device * device; 90 unsigned long long state; 91 }; 92 93 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger); 94 95 #ifdef CONFIG_ACPI_PROCFS_POWER 96 static const struct file_operations acpi_ac_fops = { 97 .owner = THIS_MODULE, 98 .open = acpi_ac_open_fs, 99 .read = seq_read, 100 .llseek = seq_lseek, 101 .release = single_release, 102 }; 103 #endif 104 #ifdef CONFIG_ACPI_SYSFS_POWER 105 static int get_ac_property(struct power_supply *psy, 106 enum power_supply_property psp, 107 union power_supply_propval *val) 108 { 109 struct acpi_ac *ac = to_acpi_ac(psy); 110 switch (psp) { 111 case POWER_SUPPLY_PROP_ONLINE: 112 val->intval = ac->state; 113 break; 114 default: 115 return -EINVAL; 116 } 117 return 0; 118 } 119 120 static enum power_supply_property ac_props[] = { 121 POWER_SUPPLY_PROP_ONLINE, 122 }; 123 #endif 124 /* -------------------------------------------------------------------------- 125 AC Adapter Management 126 -------------------------------------------------------------------------- */ 127 128 static int acpi_ac_get_state(struct acpi_ac *ac) 129 { 130 acpi_status status = AE_OK; 131 132 133 if (!ac) 134 return -EINVAL; 135 136 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state); 137 if (ACPI_FAILURE(status)) { 138 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state")); 139 ac->state = ACPI_AC_STATUS_UNKNOWN; 140 return -ENODEV; 141 } 142 143 return 0; 144 } 145 146 #ifdef CONFIG_ACPI_PROCFS_POWER 147 /* -------------------------------------------------------------------------- 148 FS Interface (/proc) 149 -------------------------------------------------------------------------- */ 150 151 static struct proc_dir_entry *acpi_ac_dir; 152 153 static int acpi_ac_seq_show(struct seq_file *seq, void *offset) 154 { 155 struct acpi_ac *ac = seq->private; 156 157 158 if (!ac) 159 return 0; 160 161 if (acpi_ac_get_state(ac)) { 162 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); 163 return 0; 164 } 165 166 seq_puts(seq, "state: "); 167 switch (ac->state) { 168 case ACPI_AC_STATUS_OFFLINE: 169 seq_puts(seq, "off-line\n"); 170 break; 171 case ACPI_AC_STATUS_ONLINE: 172 seq_puts(seq, "on-line\n"); 173 break; 174 default: 175 seq_puts(seq, "unknown\n"); 176 break; 177 } 178 179 return 0; 180 } 181 182 static int acpi_ac_open_fs(struct inode *inode, struct file *file) 183 { 184 return single_open(file, acpi_ac_seq_show, PDE(inode)->data); 185 } 186 187 static int acpi_ac_add_fs(struct acpi_device *device) 188 { 189 struct proc_dir_entry *entry = NULL; 190 191 192 if (!acpi_device_dir(device)) { 193 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 194 acpi_ac_dir); 195 if (!acpi_device_dir(device)) 196 return -ENODEV; 197 } 198 199 /* 'state' [R] */ 200 entry = proc_create_data(ACPI_AC_FILE_STATE, 201 S_IRUGO, acpi_device_dir(device), 202 &acpi_ac_fops, acpi_driver_data(device)); 203 if (!entry) 204 return -ENODEV; 205 return 0; 206 } 207 208 static int acpi_ac_remove_fs(struct acpi_device *device) 209 { 210 211 if (acpi_device_dir(device)) { 212 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device)); 213 214 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir); 215 acpi_device_dir(device) = NULL; 216 } 217 218 return 0; 219 } 220 #endif 221 222 /* -------------------------------------------------------------------------- 223 Driver Model 224 -------------------------------------------------------------------------- */ 225 226 static void acpi_ac_notify(struct acpi_device *device, u32 event) 227 { 228 struct acpi_ac *ac = acpi_driver_data(device); 229 230 231 if (!ac) 232 return; 233 234 switch (event) { 235 default: 236 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 237 "Unsupported event [0x%x]\n", event)); 238 case ACPI_AC_NOTIFY_STATUS: 239 case ACPI_NOTIFY_BUS_CHECK: 240 case ACPI_NOTIFY_DEVICE_CHECK: 241 acpi_ac_get_state(ac); 242 acpi_bus_generate_proc_event(device, event, (u32) ac->state); 243 acpi_bus_generate_netlink_event(device->pnp.device_class, 244 dev_name(&device->dev), event, 245 (u32) ac->state); 246 #ifdef CONFIG_ACPI_SYSFS_POWER 247 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 248 #endif 249 } 250 251 return; 252 } 253 254 static int acpi_ac_add(struct acpi_device *device) 255 { 256 int result = 0; 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 289 290 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 291 acpi_device_name(device), acpi_device_bid(device), 292 ac->state ? "on-line" : "off-line"); 293 294 end: 295 if (result) { 296 #ifdef CONFIG_ACPI_PROCFS_POWER 297 acpi_ac_remove_fs(device); 298 #endif 299 kfree(ac); 300 } 301 302 return result; 303 } 304 305 static int acpi_ac_resume(struct acpi_device *device) 306 { 307 struct acpi_ac *ac; 308 unsigned old_state; 309 if (!device || !acpi_driver_data(device)) 310 return -EINVAL; 311 ac = acpi_driver_data(device); 312 old_state = ac->state; 313 if (acpi_ac_get_state(ac)) 314 return 0; 315 #ifdef CONFIG_ACPI_SYSFS_POWER 316 if (old_state != ac->state) 317 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 318 #endif 319 return 0; 320 } 321 322 static int acpi_ac_remove(struct acpi_device *device, int type) 323 { 324 struct acpi_ac *ac = NULL; 325 326 327 if (!device || !acpi_driver_data(device)) 328 return -EINVAL; 329 330 ac = acpi_driver_data(device); 331 332 #ifdef CONFIG_ACPI_SYSFS_POWER 333 if (ac->charger.dev) 334 power_supply_unregister(&ac->charger); 335 #endif 336 #ifdef CONFIG_ACPI_PROCFS_POWER 337 acpi_ac_remove_fs(device); 338 #endif 339 340 kfree(ac); 341 342 return 0; 343 } 344 345 static int __init acpi_ac_init(void) 346 { 347 int result; 348 349 if (acpi_disabled) 350 return -ENODEV; 351 352 #ifdef CONFIG_ACPI_PROCFS_POWER 353 acpi_ac_dir = acpi_lock_ac_dir(); 354 if (!acpi_ac_dir) 355 return -ENODEV; 356 #endif 357 358 result = acpi_bus_register_driver(&acpi_ac_driver); 359 if (result < 0) { 360 #ifdef CONFIG_ACPI_PROCFS_POWER 361 acpi_unlock_ac_dir(acpi_ac_dir); 362 #endif 363 return -ENODEV; 364 } 365 366 return 0; 367 } 368 369 static void __exit acpi_ac_exit(void) 370 { 371 372 acpi_bus_unregister_driver(&acpi_ac_driver); 373 374 #ifdef CONFIG_ACPI_PROCFS_POWER 375 acpi_unlock_ac_dir(acpi_ac_dir); 376 #endif 377 378 return; 379 } 380 381 module_init(acpi_ac_init); 382 module_exit(acpi_ac_exit); 383