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/init.h> 29 #include <linux/types.h> 30 #include <linux/proc_fs.h> 31 #include <linux/seq_file.h> 32 #include <linux/power_supply.h> 33 #include <acpi/acpi_bus.h> 34 #include <acpi/acpi_drivers.h> 35 36 #define ACPI_AC_COMPONENT 0x00020000 37 #define ACPI_AC_CLASS "ac_adapter" 38 #define ACPI_AC_DEVICE_NAME "AC Adapter" 39 #define ACPI_AC_FILE_STATE "state" 40 #define ACPI_AC_NOTIFY_STATUS 0x80 41 #define ACPI_AC_STATUS_OFFLINE 0x00 42 #define ACPI_AC_STATUS_ONLINE 0x01 43 #define ACPI_AC_STATUS_UNKNOWN 0xFF 44 45 #define _COMPONENT ACPI_AC_COMPONENT 46 ACPI_MODULE_NAME("ac"); 47 48 MODULE_AUTHOR("Paul Diefenbaugh"); 49 MODULE_DESCRIPTION("ACPI AC Adapter Driver"); 50 MODULE_LICENSE("GPL"); 51 52 extern struct proc_dir_entry *acpi_lock_ac_dir(void); 53 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir); 54 55 static int acpi_ac_add(struct acpi_device *device); 56 static int acpi_ac_remove(struct acpi_device *device, int type); 57 static int acpi_ac_open_fs(struct inode *inode, struct file *file); 58 59 const static struct acpi_device_id ac_device_ids[] = { 60 {"ACPI0003", 0}, 61 {"", 0}, 62 }; 63 MODULE_DEVICE_TABLE(acpi, ac_device_ids); 64 65 static struct acpi_driver acpi_ac_driver = { 66 .name = "ac", 67 .class = ACPI_AC_CLASS, 68 .ids = ac_device_ids, 69 .ops = { 70 .add = acpi_ac_add, 71 .remove = acpi_ac_remove, 72 }, 73 }; 74 75 struct acpi_ac { 76 struct power_supply charger; 77 struct acpi_device * device; 78 unsigned long state; 79 }; 80 81 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger); 82 83 static const struct file_operations acpi_ac_fops = { 84 .open = acpi_ac_open_fs, 85 .read = seq_read, 86 .llseek = seq_lseek, 87 .release = single_release, 88 }; 89 static int get_ac_property(struct power_supply *psy, 90 enum power_supply_property psp, 91 union power_supply_propval *val) 92 { 93 struct acpi_ac *ac = to_acpi_ac(psy); 94 switch (psp) { 95 case POWER_SUPPLY_PROP_ONLINE: 96 val->intval = ac->state; 97 break; 98 default: 99 return -EINVAL; 100 } 101 return 0; 102 } 103 104 static enum power_supply_property ac_props[] = { 105 POWER_SUPPLY_PROP_ONLINE, 106 }; 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 FS Interface (/proc) 132 -------------------------------------------------------------------------- */ 133 134 static struct proc_dir_entry *acpi_ac_dir; 135 136 static int acpi_ac_seq_show(struct seq_file *seq, void *offset) 137 { 138 struct acpi_ac *ac = seq->private; 139 140 141 if (!ac) 142 return 0; 143 144 if (acpi_ac_get_state(ac)) { 145 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); 146 return 0; 147 } 148 149 seq_puts(seq, "state: "); 150 switch (ac->state) { 151 case ACPI_AC_STATUS_OFFLINE: 152 seq_puts(seq, "off-line\n"); 153 break; 154 case ACPI_AC_STATUS_ONLINE: 155 seq_puts(seq, "on-line\n"); 156 break; 157 default: 158 seq_puts(seq, "unknown\n"); 159 break; 160 } 161 162 return 0; 163 } 164 165 static int acpi_ac_open_fs(struct inode *inode, struct file *file) 166 { 167 return single_open(file, acpi_ac_seq_show, PDE(inode)->data); 168 } 169 170 static int acpi_ac_add_fs(struct acpi_device *device) 171 { 172 struct proc_dir_entry *entry = NULL; 173 174 175 if (!acpi_device_dir(device)) { 176 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 177 acpi_ac_dir); 178 if (!acpi_device_dir(device)) 179 return -ENODEV; 180 acpi_device_dir(device)->owner = THIS_MODULE; 181 } 182 183 /* 'state' [R] */ 184 entry = create_proc_entry(ACPI_AC_FILE_STATE, 185 S_IRUGO, acpi_device_dir(device)); 186 if (!entry) 187 return -ENODEV; 188 else { 189 entry->proc_fops = &acpi_ac_fops; 190 entry->data = acpi_driver_data(device); 191 entry->owner = THIS_MODULE; 192 } 193 194 return 0; 195 } 196 197 static int acpi_ac_remove_fs(struct acpi_device *device) 198 { 199 200 if (acpi_device_dir(device)) { 201 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device)); 202 203 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir); 204 acpi_device_dir(device) = NULL; 205 } 206 207 return 0; 208 } 209 210 /* -------------------------------------------------------------------------- 211 Driver Model 212 -------------------------------------------------------------------------- */ 213 214 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data) 215 { 216 struct acpi_ac *ac = data; 217 struct acpi_device *device = NULL; 218 219 220 if (!ac) 221 return; 222 223 device = ac->device; 224 switch (event) { 225 case ACPI_AC_NOTIFY_STATUS: 226 case ACPI_NOTIFY_BUS_CHECK: 227 case ACPI_NOTIFY_DEVICE_CHECK: 228 acpi_ac_get_state(ac); 229 acpi_bus_generate_proc_event(device, event, (u32) ac->state); 230 acpi_bus_generate_netlink_event(device->pnp.device_class, 231 device->dev.bus_id, event, 232 (u32) ac->state); 233 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 234 break; 235 default: 236 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 237 "Unsupported event [0x%x]\n", event)); 238 break; 239 } 240 241 return; 242 } 243 244 static int acpi_ac_add(struct acpi_device *device) 245 { 246 int result = 0; 247 acpi_status status = AE_OK; 248 struct acpi_ac *ac = NULL; 249 250 251 if (!device) 252 return -EINVAL; 253 254 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); 255 if (!ac) 256 return -ENOMEM; 257 258 ac->device = device; 259 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); 260 strcpy(acpi_device_class(device), ACPI_AC_CLASS); 261 acpi_driver_data(device) = ac; 262 263 result = acpi_ac_get_state(ac); 264 if (result) 265 goto end; 266 267 result = acpi_ac_add_fs(device); 268 if (result) 269 goto end; 270 ac->charger.name = acpi_device_bid(device); 271 ac->charger.type = POWER_SUPPLY_TYPE_MAINS; 272 ac->charger.properties = ac_props; 273 ac->charger.num_properties = ARRAY_SIZE(ac_props); 274 ac->charger.get_property = get_ac_property; 275 power_supply_register(&ac->device->dev, &ac->charger); 276 status = acpi_install_notify_handler(device->handle, 277 ACPI_ALL_NOTIFY, acpi_ac_notify, 278 ac); 279 if (ACPI_FAILURE(status)) { 280 result = -ENODEV; 281 goto end; 282 } 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 acpi_ac_remove_fs(device); 291 kfree(ac); 292 } 293 294 return result; 295 } 296 297 static int acpi_ac_remove(struct acpi_device *device, int type) 298 { 299 acpi_status status = AE_OK; 300 struct acpi_ac *ac = NULL; 301 302 303 if (!device || !acpi_driver_data(device)) 304 return -EINVAL; 305 306 ac = acpi_driver_data(device); 307 308 status = acpi_remove_notify_handler(device->handle, 309 ACPI_ALL_NOTIFY, acpi_ac_notify); 310 if (ac->charger.dev) 311 power_supply_unregister(&ac->charger); 312 acpi_ac_remove_fs(device); 313 314 kfree(ac); 315 316 return 0; 317 } 318 319 static int __init acpi_ac_init(void) 320 { 321 int result; 322 323 if (acpi_disabled) 324 return -ENODEV; 325 326 acpi_ac_dir = acpi_lock_ac_dir(); 327 if (!acpi_ac_dir) 328 return -ENODEV; 329 330 result = acpi_bus_register_driver(&acpi_ac_driver); 331 if (result < 0) { 332 acpi_unlock_ac_dir(acpi_ac_dir); 333 return -ENODEV; 334 } 335 336 return 0; 337 } 338 339 static void __exit acpi_ac_exit(void) 340 { 341 342 acpi_bus_unregister_driver(&acpi_ac_driver); 343 344 acpi_unlock_ac_dir(acpi_ac_dir); 345 346 return; 347 } 348 349 module_init(acpi_ac_init); 350 module_exit(acpi_ac_exit); 351