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 <acpi/acpi_bus.h> 33 #include <acpi/acpi_drivers.h> 34 35 36 #define ACPI_AC_COMPONENT 0x00020000 37 #define ACPI_AC_CLASS "ac_adapter" 38 #define ACPI_AC_HID "ACPI0003" 39 #define ACPI_AC_DRIVER_NAME "ACPI AC Adapter Driver" 40 #define ACPI_AC_DEVICE_NAME "AC Adapter" 41 #define ACPI_AC_FILE_STATE "state" 42 #define ACPI_AC_NOTIFY_STATUS 0x80 43 #define ACPI_AC_STATUS_OFFLINE 0x00 44 #define ACPI_AC_STATUS_ONLINE 0x01 45 #define ACPI_AC_STATUS_UNKNOWN 0xFF 46 47 #define _COMPONENT ACPI_AC_COMPONENT 48 ACPI_MODULE_NAME ("acpi_ac") 49 50 MODULE_AUTHOR("Paul Diefenbaugh"); 51 MODULE_DESCRIPTION(ACPI_AC_DRIVER_NAME); 52 MODULE_LICENSE("GPL"); 53 54 static int acpi_ac_add (struct acpi_device *device); 55 static int acpi_ac_remove (struct acpi_device *device, int type); 56 static int acpi_ac_open_fs(struct inode *inode, struct file *file); 57 58 static struct acpi_driver acpi_ac_driver = { 59 .name = ACPI_AC_DRIVER_NAME, 60 .class = ACPI_AC_CLASS, 61 .ids = ACPI_AC_HID, 62 .ops = { 63 .add = acpi_ac_add, 64 .remove = acpi_ac_remove, 65 }, 66 }; 67 68 struct acpi_ac { 69 acpi_handle handle; 70 unsigned long state; 71 }; 72 73 static struct file_operations acpi_ac_fops = { 74 .open = acpi_ac_open_fs, 75 .read = seq_read, 76 .llseek = seq_lseek, 77 .release = single_release, 78 }; 79 80 /* -------------------------------------------------------------------------- 81 AC Adapter Management 82 -------------------------------------------------------------------------- */ 83 84 static int 85 acpi_ac_get_state ( 86 struct acpi_ac *ac) 87 { 88 acpi_status status = AE_OK; 89 90 ACPI_FUNCTION_TRACE("acpi_ac_get_state"); 91 92 if (!ac) 93 return_VALUE(-EINVAL); 94 95 status = acpi_evaluate_integer(ac->handle, "_PSR", NULL, &ac->state); 96 if (ACPI_FAILURE(status)) { 97 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 98 "Error reading AC Adapter state\n")); 99 ac->state = ACPI_AC_STATUS_UNKNOWN; 100 return_VALUE(-ENODEV); 101 } 102 103 return_VALUE(0); 104 } 105 106 107 /* -------------------------------------------------------------------------- 108 FS Interface (/proc) 109 -------------------------------------------------------------------------- */ 110 111 static struct proc_dir_entry *acpi_ac_dir; 112 113 static int acpi_ac_seq_show(struct seq_file *seq, void *offset) 114 { 115 struct acpi_ac *ac = (struct acpi_ac *) seq->private; 116 117 ACPI_FUNCTION_TRACE("acpi_ac_seq_show"); 118 119 if (!ac) 120 return_VALUE(0); 121 122 if (acpi_ac_get_state(ac)) { 123 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); 124 return_VALUE(0); 125 } 126 127 seq_puts(seq, "state: "); 128 switch (ac->state) { 129 case ACPI_AC_STATUS_OFFLINE: 130 seq_puts(seq, "off-line\n"); 131 break; 132 case ACPI_AC_STATUS_ONLINE: 133 seq_puts(seq, "on-line\n"); 134 break; 135 default: 136 seq_puts(seq, "unknown\n"); 137 break; 138 } 139 140 return_VALUE(0); 141 } 142 143 static int acpi_ac_open_fs(struct inode *inode, struct file *file) 144 { 145 return single_open(file, acpi_ac_seq_show, PDE(inode)->data); 146 } 147 148 static int 149 acpi_ac_add_fs ( 150 struct acpi_device *device) 151 { 152 struct proc_dir_entry *entry = NULL; 153 154 ACPI_FUNCTION_TRACE("acpi_ac_add_fs"); 155 156 if (!acpi_device_dir(device)) { 157 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 158 acpi_ac_dir); 159 if (!acpi_device_dir(device)) 160 return_VALUE(-ENODEV); 161 acpi_device_dir(device)->owner = THIS_MODULE; 162 } 163 164 /* 'state' [R] */ 165 entry = create_proc_entry(ACPI_AC_FILE_STATE, 166 S_IRUGO, acpi_device_dir(device)); 167 if (!entry) 168 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 169 "Unable to create '%s' fs entry\n", 170 ACPI_AC_FILE_STATE)); 171 else { 172 entry->proc_fops = &acpi_ac_fops; 173 entry->data = acpi_driver_data(device); 174 entry->owner = THIS_MODULE; 175 } 176 177 return_VALUE(0); 178 } 179 180 181 static int 182 acpi_ac_remove_fs ( 183 struct acpi_device *device) 184 { 185 ACPI_FUNCTION_TRACE("acpi_ac_remove_fs"); 186 187 if (acpi_device_dir(device)) { 188 remove_proc_entry(ACPI_AC_FILE_STATE, 189 acpi_device_dir(device)); 190 191 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir); 192 acpi_device_dir(device) = NULL; 193 } 194 195 return_VALUE(0); 196 } 197 198 199 /* -------------------------------------------------------------------------- 200 Driver Model 201 -------------------------------------------------------------------------- */ 202 203 static void 204 acpi_ac_notify ( 205 acpi_handle handle, 206 u32 event, 207 void *data) 208 { 209 struct acpi_ac *ac = (struct acpi_ac *) data; 210 struct acpi_device *device = NULL; 211 212 ACPI_FUNCTION_TRACE("acpi_ac_notify"); 213 214 if (!ac) 215 return_VOID; 216 217 if (acpi_bus_get_device(ac->handle, &device)) 218 return_VOID; 219 220 switch (event) { 221 case ACPI_AC_NOTIFY_STATUS: 222 acpi_ac_get_state(ac); 223 acpi_bus_generate_event(device, event, (u32) ac->state); 224 break; 225 default: 226 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 227 "Unsupported event [0x%x]\n", event)); 228 break; 229 } 230 231 return_VOID; 232 } 233 234 235 static int 236 acpi_ac_add ( 237 struct acpi_device *device) 238 { 239 int result = 0; 240 acpi_status status = AE_OK; 241 struct acpi_ac *ac = NULL; 242 243 ACPI_FUNCTION_TRACE("acpi_ac_add"); 244 245 if (!device) 246 return_VALUE(-EINVAL); 247 248 ac = kmalloc(sizeof(struct acpi_ac), GFP_KERNEL); 249 if (!ac) 250 return_VALUE(-ENOMEM); 251 memset(ac, 0, sizeof(struct acpi_ac)); 252 253 ac->handle = device->handle; 254 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); 255 strcpy(acpi_device_class(device), ACPI_AC_CLASS); 256 acpi_driver_data(device) = ac; 257 258 result = acpi_ac_get_state(ac); 259 if (result) 260 goto end; 261 262 result = acpi_ac_add_fs(device); 263 if (result) 264 goto end; 265 266 status = acpi_install_notify_handler(ac->handle, 267 ACPI_DEVICE_NOTIFY, acpi_ac_notify, ac); 268 if (ACPI_FAILURE(status)) { 269 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 270 "Error installing notify handler\n")); 271 result = -ENODEV; 272 goto end; 273 } 274 275 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 276 acpi_device_name(device), acpi_device_bid(device), 277 ac->state?"on-line":"off-line"); 278 279 end: 280 if (result) { 281 acpi_ac_remove_fs(device); 282 kfree(ac); 283 } 284 285 return_VALUE(result); 286 } 287 288 289 static int 290 acpi_ac_remove ( 291 struct acpi_device *device, 292 int type) 293 { 294 acpi_status status = AE_OK; 295 struct acpi_ac *ac = NULL; 296 297 ACPI_FUNCTION_TRACE("acpi_ac_remove"); 298 299 if (!device || !acpi_driver_data(device)) 300 return_VALUE(-EINVAL); 301 302 ac = (struct acpi_ac *) acpi_driver_data(device); 303 304 status = acpi_remove_notify_handler(ac->handle, 305 ACPI_DEVICE_NOTIFY, acpi_ac_notify); 306 if (ACPI_FAILURE(status)) 307 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 308 "Error removing notify handler\n")); 309 310 acpi_ac_remove_fs(device); 311 312 kfree(ac); 313 314 return_VALUE(0); 315 } 316 317 318 static int __init 319 acpi_ac_init (void) 320 { 321 int result = 0; 322 323 ACPI_FUNCTION_TRACE("acpi_ac_init"); 324 325 acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir); 326 if (!acpi_ac_dir) 327 return_VALUE(-ENODEV); 328 acpi_ac_dir->owner = THIS_MODULE; 329 330 result = acpi_bus_register_driver(&acpi_ac_driver); 331 if (result < 0) { 332 remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir); 333 return_VALUE(-ENODEV); 334 } 335 336 return_VALUE(0); 337 } 338 339 340 static void __exit 341 acpi_ac_exit (void) 342 { 343 ACPI_FUNCTION_TRACE("acpi_ac_exit"); 344 345 acpi_bus_unregister_driver(&acpi_ac_driver); 346 347 remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir); 348 349 return_VOID; 350 } 351 352 353 module_init(acpi_ac_init); 354 module_exit(acpi_ac_exit); 355