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 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 #ifdef CONFIG_PM_SLEEP 73 static int acpi_ac_resume(struct device *dev); 74 #endif 75 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume); 76 77 static struct acpi_driver acpi_ac_driver = { 78 .name = "ac", 79 .class = ACPI_AC_CLASS, 80 .ids = ac_device_ids, 81 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, 82 .ops = { 83 .add = acpi_ac_add, 84 .remove = acpi_ac_remove, 85 .notify = acpi_ac_notify, 86 }, 87 .drv.pm = &acpi_ac_pm, 88 }; 89 90 struct acpi_ac { 91 struct power_supply charger; 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 107 108 /* -------------------------------------------------------------------------- 109 AC Adapter Management 110 -------------------------------------------------------------------------- */ 111 112 static int acpi_ac_get_state(struct acpi_ac *ac) 113 { 114 acpi_status status = AE_OK; 115 116 117 if (!ac) 118 return -EINVAL; 119 120 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state); 121 if (ACPI_FAILURE(status)) { 122 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state")); 123 ac->state = ACPI_AC_STATUS_UNKNOWN; 124 return -ENODEV; 125 } 126 127 return 0; 128 } 129 130 /* -------------------------------------------------------------------------- 131 sysfs I/F 132 -------------------------------------------------------------------------- */ 133 static int get_ac_property(struct power_supply *psy, 134 enum power_supply_property psp, 135 union power_supply_propval *val) 136 { 137 struct acpi_ac *ac = to_acpi_ac(psy); 138 139 if (!ac) 140 return -ENODEV; 141 142 if (acpi_ac_get_state(ac)) 143 return -ENODEV; 144 145 switch (psp) { 146 case POWER_SUPPLY_PROP_ONLINE: 147 val->intval = ac->state; 148 break; 149 default: 150 return -EINVAL; 151 } 152 return 0; 153 } 154 155 static enum power_supply_property ac_props[] = { 156 POWER_SUPPLY_PROP_ONLINE, 157 }; 158 159 #ifdef CONFIG_ACPI_PROCFS_POWER 160 /* -------------------------------------------------------------------------- 161 FS Interface (/proc) 162 -------------------------------------------------------------------------- */ 163 164 static struct proc_dir_entry *acpi_ac_dir; 165 166 static int acpi_ac_seq_show(struct seq_file *seq, void *offset) 167 { 168 struct acpi_ac *ac = seq->private; 169 170 171 if (!ac) 172 return 0; 173 174 if (acpi_ac_get_state(ac)) { 175 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); 176 return 0; 177 } 178 179 seq_puts(seq, "state: "); 180 switch (ac->state) { 181 case ACPI_AC_STATUS_OFFLINE: 182 seq_puts(seq, "off-line\n"); 183 break; 184 case ACPI_AC_STATUS_ONLINE: 185 seq_puts(seq, "on-line\n"); 186 break; 187 default: 188 seq_puts(seq, "unknown\n"); 189 break; 190 } 191 192 return 0; 193 } 194 195 static int acpi_ac_open_fs(struct inode *inode, struct file *file) 196 { 197 return single_open(file, acpi_ac_seq_show, PDE(inode)->data); 198 } 199 200 static int acpi_ac_add_fs(struct acpi_device *device) 201 { 202 struct proc_dir_entry *entry = NULL; 203 204 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded," 205 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n"); 206 if (!acpi_device_dir(device)) { 207 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 208 acpi_ac_dir); 209 if (!acpi_device_dir(device)) 210 return -ENODEV; 211 } 212 213 /* 'state' [R] */ 214 entry = proc_create_data(ACPI_AC_FILE_STATE, 215 S_IRUGO, acpi_device_dir(device), 216 &acpi_ac_fops, acpi_driver_data(device)); 217 if (!entry) 218 return -ENODEV; 219 return 0; 220 } 221 222 static int acpi_ac_remove_fs(struct acpi_device *device) 223 { 224 225 if (acpi_device_dir(device)) { 226 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device)); 227 228 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir); 229 acpi_device_dir(device) = NULL; 230 } 231 232 return 0; 233 } 234 #endif 235 236 /* -------------------------------------------------------------------------- 237 Driver Model 238 -------------------------------------------------------------------------- */ 239 240 static void acpi_ac_notify(struct acpi_device *device, u32 event) 241 { 242 struct acpi_ac *ac = acpi_driver_data(device); 243 244 245 if (!ac) 246 return; 247 248 switch (event) { 249 default: 250 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 251 "Unsupported event [0x%x]\n", event)); 252 case ACPI_AC_NOTIFY_STATUS: 253 case ACPI_NOTIFY_BUS_CHECK: 254 case ACPI_NOTIFY_DEVICE_CHECK: 255 acpi_ac_get_state(ac); 256 acpi_bus_generate_proc_event(device, event, (u32) ac->state); 257 acpi_bus_generate_netlink_event(device->pnp.device_class, 258 dev_name(&device->dev), event, 259 (u32) ac->state); 260 acpi_notifier_call_chain(device, event, (u32) ac->state); 261 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 262 } 263 264 return; 265 } 266 267 static int acpi_ac_add(struct acpi_device *device) 268 { 269 int result = 0; 270 struct acpi_ac *ac = NULL; 271 272 273 if (!device) 274 return -EINVAL; 275 276 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); 277 if (!ac) 278 return -ENOMEM; 279 280 ac->device = device; 281 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); 282 strcpy(acpi_device_class(device), ACPI_AC_CLASS); 283 device->driver_data = ac; 284 285 result = acpi_ac_get_state(ac); 286 if (result) 287 goto end; 288 289 #ifdef CONFIG_ACPI_PROCFS_POWER 290 result = acpi_ac_add_fs(device); 291 #endif 292 if (result) 293 goto end; 294 ac->charger.name = acpi_device_bid(device); 295 ac->charger.type = POWER_SUPPLY_TYPE_MAINS; 296 ac->charger.properties = ac_props; 297 ac->charger.num_properties = ARRAY_SIZE(ac_props); 298 ac->charger.get_property = get_ac_property; 299 result = power_supply_register(&ac->device->dev, &ac->charger); 300 if (result) 301 goto end; 302 303 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 304 acpi_device_name(device), acpi_device_bid(device), 305 ac->state ? "on-line" : "off-line"); 306 307 end: 308 if (result) { 309 #ifdef CONFIG_ACPI_PROCFS_POWER 310 acpi_ac_remove_fs(device); 311 #endif 312 kfree(ac); 313 } 314 315 return result; 316 } 317 318 #ifdef CONFIG_PM_SLEEP 319 static int acpi_ac_resume(struct device *dev) 320 { 321 struct acpi_ac *ac; 322 unsigned old_state; 323 324 if (!dev) 325 return -EINVAL; 326 327 ac = acpi_driver_data(to_acpi_device(dev)); 328 if (!ac) 329 return -EINVAL; 330 331 old_state = ac->state; 332 if (acpi_ac_get_state(ac)) 333 return 0; 334 if (old_state != ac->state) 335 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 336 return 0; 337 } 338 #endif 339 340 static int acpi_ac_remove(struct acpi_device *device, int type) 341 { 342 struct acpi_ac *ac = NULL; 343 344 345 if (!device || !acpi_driver_data(device)) 346 return -EINVAL; 347 348 ac = acpi_driver_data(device); 349 350 if (ac->charger.dev) 351 power_supply_unregister(&ac->charger); 352 #ifdef CONFIG_ACPI_PROCFS_POWER 353 acpi_ac_remove_fs(device); 354 #endif 355 356 kfree(ac); 357 358 return 0; 359 } 360 361 static int __init acpi_ac_init(void) 362 { 363 int result; 364 365 if (acpi_disabled) 366 return -ENODEV; 367 368 #ifdef CONFIG_ACPI_PROCFS_POWER 369 acpi_ac_dir = acpi_lock_ac_dir(); 370 if (!acpi_ac_dir) 371 return -ENODEV; 372 #endif 373 374 result = acpi_bus_register_driver(&acpi_ac_driver); 375 if (result < 0) { 376 #ifdef CONFIG_ACPI_PROCFS_POWER 377 acpi_unlock_ac_dir(acpi_ac_dir); 378 #endif 379 return -ENODEV; 380 } 381 382 return 0; 383 } 384 385 static void __exit acpi_ac_exit(void) 386 { 387 388 acpi_bus_unregister_driver(&acpi_ac_driver); 389 390 #ifdef CONFIG_ACPI_PROCFS_POWER 391 acpi_unlock_ac_dir(acpi_ac_dir); 392 #endif 393 394 return; 395 } 396 397 module_init(acpi_ac_init); 398 module_exit(acpi_ac_exit); 399