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 static int acpi_ac_resume(struct device *dev); 73 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume); 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 .notify = acpi_ac_notify, 84 }, 85 .drv.pm = &acpi_ac_pm, 86 }; 87 88 struct acpi_ac { 89 struct power_supply charger; 90 struct acpi_device * device; 91 unsigned long long state; 92 }; 93 94 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger) 95 96 #ifdef CONFIG_ACPI_PROCFS_POWER 97 static const struct file_operations acpi_ac_fops = { 98 .owner = THIS_MODULE, 99 .open = acpi_ac_open_fs, 100 .read = seq_read, 101 .llseek = seq_lseek, 102 .release = single_release, 103 }; 104 #endif 105 106 /* -------------------------------------------------------------------------- 107 AC Adapter Management 108 -------------------------------------------------------------------------- */ 109 110 static int acpi_ac_get_state(struct acpi_ac *ac) 111 { 112 acpi_status status = AE_OK; 113 114 115 if (!ac) 116 return -EINVAL; 117 118 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state); 119 if (ACPI_FAILURE(status)) { 120 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state")); 121 ac->state = ACPI_AC_STATUS_UNKNOWN; 122 return -ENODEV; 123 } 124 125 return 0; 126 } 127 128 /* -------------------------------------------------------------------------- 129 sysfs I/F 130 -------------------------------------------------------------------------- */ 131 static int get_ac_property(struct power_supply *psy, 132 enum power_supply_property psp, 133 union power_supply_propval *val) 134 { 135 struct acpi_ac *ac = to_acpi_ac(psy); 136 137 if (!ac) 138 return -ENODEV; 139 140 if (acpi_ac_get_state(ac)) 141 return -ENODEV; 142 143 switch (psp) { 144 case POWER_SUPPLY_PROP_ONLINE: 145 val->intval = ac->state; 146 break; 147 default: 148 return -EINVAL; 149 } 150 return 0; 151 } 152 153 static enum power_supply_property ac_props[] = { 154 POWER_SUPPLY_PROP_ONLINE, 155 }; 156 157 #ifdef CONFIG_ACPI_PROCFS_POWER 158 /* -------------------------------------------------------------------------- 159 FS Interface (/proc) 160 -------------------------------------------------------------------------- */ 161 162 static struct proc_dir_entry *acpi_ac_dir; 163 164 static int acpi_ac_seq_show(struct seq_file *seq, void *offset) 165 { 166 struct acpi_ac *ac = seq->private; 167 168 169 if (!ac) 170 return 0; 171 172 if (acpi_ac_get_state(ac)) { 173 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); 174 return 0; 175 } 176 177 seq_puts(seq, "state: "); 178 switch (ac->state) { 179 case ACPI_AC_STATUS_OFFLINE: 180 seq_puts(seq, "off-line\n"); 181 break; 182 case ACPI_AC_STATUS_ONLINE: 183 seq_puts(seq, "on-line\n"); 184 break; 185 default: 186 seq_puts(seq, "unknown\n"); 187 break; 188 } 189 190 return 0; 191 } 192 193 static int acpi_ac_open_fs(struct inode *inode, struct file *file) 194 { 195 return single_open(file, acpi_ac_seq_show, PDE(inode)->data); 196 } 197 198 static int acpi_ac_add_fs(struct acpi_device *device) 199 { 200 struct proc_dir_entry *entry = NULL; 201 202 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded," 203 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n"); 204 if (!acpi_device_dir(device)) { 205 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 206 acpi_ac_dir); 207 if (!acpi_device_dir(device)) 208 return -ENODEV; 209 } 210 211 /* 'state' [R] */ 212 entry = proc_create_data(ACPI_AC_FILE_STATE, 213 S_IRUGO, acpi_device_dir(device), 214 &acpi_ac_fops, acpi_driver_data(device)); 215 if (!entry) 216 return -ENODEV; 217 return 0; 218 } 219 220 static int acpi_ac_remove_fs(struct acpi_device *device) 221 { 222 223 if (acpi_device_dir(device)) { 224 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device)); 225 226 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir); 227 acpi_device_dir(device) = NULL; 228 } 229 230 return 0; 231 } 232 #endif 233 234 /* -------------------------------------------------------------------------- 235 Driver Model 236 -------------------------------------------------------------------------- */ 237 238 static void acpi_ac_notify(struct acpi_device *device, u32 event) 239 { 240 struct acpi_ac *ac = acpi_driver_data(device); 241 242 243 if (!ac) 244 return; 245 246 switch (event) { 247 default: 248 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 249 "Unsupported event [0x%x]\n", event)); 250 case ACPI_AC_NOTIFY_STATUS: 251 case ACPI_NOTIFY_BUS_CHECK: 252 case ACPI_NOTIFY_DEVICE_CHECK: 253 acpi_ac_get_state(ac); 254 acpi_bus_generate_proc_event(device, event, (u32) ac->state); 255 acpi_bus_generate_netlink_event(device->pnp.device_class, 256 dev_name(&device->dev), event, 257 (u32) ac->state); 258 acpi_notifier_call_chain(device, event, (u32) ac->state); 259 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 260 } 261 262 return; 263 } 264 265 static int acpi_ac_add(struct acpi_device *device) 266 { 267 int result = 0; 268 struct acpi_ac *ac = NULL; 269 270 271 if (!device) 272 return -EINVAL; 273 274 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); 275 if (!ac) 276 return -ENOMEM; 277 278 ac->device = device; 279 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); 280 strcpy(acpi_device_class(device), ACPI_AC_CLASS); 281 device->driver_data = ac; 282 283 result = acpi_ac_get_state(ac); 284 if (result) 285 goto end; 286 287 #ifdef CONFIG_ACPI_PROCFS_POWER 288 result = acpi_ac_add_fs(device); 289 #endif 290 if (result) 291 goto end; 292 ac->charger.name = acpi_device_bid(device); 293 ac->charger.type = POWER_SUPPLY_TYPE_MAINS; 294 ac->charger.properties = ac_props; 295 ac->charger.num_properties = ARRAY_SIZE(ac_props); 296 ac->charger.get_property = get_ac_property; 297 result = power_supply_register(&ac->device->dev, &ac->charger); 298 if (result) 299 goto end; 300 301 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 302 acpi_device_name(device), acpi_device_bid(device), 303 ac->state ? "on-line" : "off-line"); 304 305 end: 306 if (result) { 307 #ifdef CONFIG_ACPI_PROCFS_POWER 308 acpi_ac_remove_fs(device); 309 #endif 310 kfree(ac); 311 } 312 313 return result; 314 } 315 316 static int acpi_ac_resume(struct device *dev) 317 { 318 struct acpi_ac *ac; 319 unsigned old_state; 320 321 if (!dev) 322 return -EINVAL; 323 324 ac = acpi_driver_data(to_acpi_device(dev)); 325 if (!ac) 326 return -EINVAL; 327 328 old_state = ac->state; 329 if (acpi_ac_get_state(ac)) 330 return 0; 331 if (old_state != ac->state) 332 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 333 return 0; 334 } 335 336 static int acpi_ac_remove(struct acpi_device *device, int type) 337 { 338 struct acpi_ac *ac = NULL; 339 340 341 if (!device || !acpi_driver_data(device)) 342 return -EINVAL; 343 344 ac = acpi_driver_data(device); 345 346 if (ac->charger.dev) 347 power_supply_unregister(&ac->charger); 348 #ifdef CONFIG_ACPI_PROCFS_POWER 349 acpi_ac_remove_fs(device); 350 #endif 351 352 kfree(ac); 353 354 return 0; 355 } 356 357 static int __init acpi_ac_init(void) 358 { 359 int result; 360 361 if (acpi_disabled) 362 return -ENODEV; 363 364 #ifdef CONFIG_ACPI_PROCFS_POWER 365 acpi_ac_dir = acpi_lock_ac_dir(); 366 if (!acpi_ac_dir) 367 return -ENODEV; 368 #endif 369 370 result = acpi_bus_register_driver(&acpi_ac_driver); 371 if (result < 0) { 372 #ifdef CONFIG_ACPI_PROCFS_POWER 373 acpi_unlock_ac_dir(acpi_ac_dir); 374 #endif 375 return -ENODEV; 376 } 377 378 return 0; 379 } 380 381 static void __exit acpi_ac_exit(void) 382 { 383 384 acpi_bus_unregister_driver(&acpi_ac_driver); 385 386 #ifdef CONFIG_ACPI_PROCFS_POWER 387 acpi_unlock_ac_dir(acpi_ac_dir); 388 #endif 389 390 return; 391 } 392 393 module_init(acpi_ac_init); 394 module_exit(acpi_ac_exit); 395