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