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_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 static struct acpi_driver acpi_ac_driver = { 60 .name = "ac", 61 .class = ACPI_AC_CLASS, 62 .ids = ACPI_AC_HID, 63 .ops = { 64 .add = acpi_ac_add, 65 .remove = acpi_ac_remove, 66 }, 67 }; 68 69 struct acpi_ac { 70 struct acpi_device * device; 71 unsigned long state; 72 }; 73 74 static const struct file_operations acpi_ac_fops = { 75 .open = acpi_ac_open_fs, 76 .read = seq_read, 77 .llseek = seq_lseek, 78 .release = single_release, 79 }; 80 81 /* -------------------------------------------------------------------------- 82 AC Adapter Management 83 -------------------------------------------------------------------------- */ 84 85 static int acpi_ac_get_state(struct acpi_ac *ac) 86 { 87 acpi_status status = AE_OK; 88 89 90 if (!ac) 91 return -EINVAL; 92 93 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state); 94 if (ACPI_FAILURE(status)) { 95 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state")); 96 ac->state = ACPI_AC_STATUS_UNKNOWN; 97 return -ENODEV; 98 } 99 100 return 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 = seq->private; 112 113 114 if (!ac) 115 return 0; 116 117 if (acpi_ac_get_state(ac)) { 118 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); 119 return 0; 120 } 121 122 seq_puts(seq, "state: "); 123 switch (ac->state) { 124 case ACPI_AC_STATUS_OFFLINE: 125 seq_puts(seq, "off-line\n"); 126 break; 127 case ACPI_AC_STATUS_ONLINE: 128 seq_puts(seq, "on-line\n"); 129 break; 130 default: 131 seq_puts(seq, "unknown\n"); 132 break; 133 } 134 135 return 0; 136 } 137 138 static int acpi_ac_open_fs(struct inode *inode, struct file *file) 139 { 140 return single_open(file, acpi_ac_seq_show, PDE(inode)->data); 141 } 142 143 static int acpi_ac_add_fs(struct acpi_device *device) 144 { 145 struct proc_dir_entry *entry = NULL; 146 147 148 if (!acpi_device_dir(device)) { 149 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 150 acpi_ac_dir); 151 if (!acpi_device_dir(device)) 152 return -ENODEV; 153 acpi_device_dir(device)->owner = THIS_MODULE; 154 } 155 156 /* 'state' [R] */ 157 entry = create_proc_entry(ACPI_AC_FILE_STATE, 158 S_IRUGO, acpi_device_dir(device)); 159 if (!entry) 160 return -ENODEV; 161 else { 162 entry->proc_fops = &acpi_ac_fops; 163 entry->data = acpi_driver_data(device); 164 entry->owner = THIS_MODULE; 165 } 166 167 return 0; 168 } 169 170 static int acpi_ac_remove_fs(struct acpi_device *device) 171 { 172 173 if (acpi_device_dir(device)) { 174 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device)); 175 176 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir); 177 acpi_device_dir(device) = NULL; 178 } 179 180 return 0; 181 } 182 183 /* -------------------------------------------------------------------------- 184 Driver Model 185 -------------------------------------------------------------------------- */ 186 187 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data) 188 { 189 struct acpi_ac *ac = data; 190 struct acpi_device *device = NULL; 191 192 193 if (!ac) 194 return; 195 196 device = ac->device; 197 switch (event) { 198 case ACPI_AC_NOTIFY_STATUS: 199 case ACPI_NOTIFY_BUS_CHECK: 200 case ACPI_NOTIFY_DEVICE_CHECK: 201 acpi_ac_get_state(ac); 202 acpi_bus_generate_event(device, event, (u32) ac->state); 203 break; 204 default: 205 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 206 "Unsupported event [0x%x]\n", event)); 207 break; 208 } 209 210 return; 211 } 212 213 static int acpi_ac_add(struct acpi_device *device) 214 { 215 int result = 0; 216 acpi_status status = AE_OK; 217 struct acpi_ac *ac = NULL; 218 219 220 if (!device) 221 return -EINVAL; 222 223 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); 224 if (!ac) 225 return -ENOMEM; 226 227 ac->device = device; 228 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); 229 strcpy(acpi_device_class(device), ACPI_AC_CLASS); 230 acpi_driver_data(device) = ac; 231 232 result = acpi_ac_get_state(ac); 233 if (result) 234 goto end; 235 236 result = acpi_ac_add_fs(device); 237 if (result) 238 goto end; 239 240 status = acpi_install_notify_handler(device->handle, 241 ACPI_ALL_NOTIFY, acpi_ac_notify, 242 ac); 243 if (ACPI_FAILURE(status)) { 244 result = -ENODEV; 245 goto end; 246 } 247 248 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 249 acpi_device_name(device), acpi_device_bid(device), 250 ac->state ? "on-line" : "off-line"); 251 252 end: 253 if (result) { 254 acpi_ac_remove_fs(device); 255 kfree(ac); 256 } 257 258 return result; 259 } 260 261 static int acpi_ac_remove(struct acpi_device *device, int type) 262 { 263 acpi_status status = AE_OK; 264 struct acpi_ac *ac = NULL; 265 266 267 if (!device || !acpi_driver_data(device)) 268 return -EINVAL; 269 270 ac = acpi_driver_data(device); 271 272 status = acpi_remove_notify_handler(device->handle, 273 ACPI_ALL_NOTIFY, acpi_ac_notify); 274 275 acpi_ac_remove_fs(device); 276 277 kfree(ac); 278 279 return 0; 280 } 281 282 static int __init acpi_ac_init(void) 283 { 284 int result; 285 286 if (acpi_disabled) 287 return -ENODEV; 288 289 acpi_ac_dir = acpi_lock_ac_dir(); 290 if (!acpi_ac_dir) 291 return -ENODEV; 292 293 result = acpi_bus_register_driver(&acpi_ac_driver); 294 if (result < 0) { 295 acpi_unlock_ac_dir(acpi_ac_dir); 296 return -ENODEV; 297 } 298 299 return 0; 300 } 301 302 static void __exit acpi_ac_exit(void) 303 { 304 305 acpi_bus_unregister_driver(&acpi_ac_driver); 306 307 acpi_unlock_ac_dir(acpi_ac_dir); 308 309 return; 310 } 311 312 module_init(acpi_ac_init); 313 module_exit(acpi_ac_exit); 314