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