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