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