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 extern struct proc_dir_entry *acpi_lock_ac_dir(void); 54 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir); 55 56 static int acpi_ac_add(struct acpi_device *device); 57 static int acpi_ac_remove(struct acpi_device *device, int type); 58 static int acpi_ac_open_fs(struct inode *inode, struct file *file); 59 60 static struct acpi_driver acpi_ac_driver = { 61 .name = ACPI_AC_DRIVER_NAME, 62 .class = ACPI_AC_CLASS, 63 .ids = ACPI_AC_HID, 64 .ops = { 65 .add = acpi_ac_add, 66 .remove = acpi_ac_remove, 67 }, 68 }; 69 70 struct acpi_ac { 71 struct acpi_device * device; 72 unsigned long state; 73 }; 74 75 static struct file_operations acpi_ac_fops = { 76 .open = acpi_ac_open_fs, 77 .read = seq_read, 78 .llseek = seq_lseek, 79 .release = single_release, 80 }; 81 82 /* -------------------------------------------------------------------------- 83 AC Adapter Management 84 -------------------------------------------------------------------------- */ 85 86 static int acpi_ac_get_state(struct acpi_ac *ac) 87 { 88 acpi_status status = AE_OK; 89 90 91 if (!ac) 92 return -EINVAL; 93 94 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state); 95 if (ACPI_FAILURE(status)) { 96 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state")); 97 ac->state = ACPI_AC_STATUS_UNKNOWN; 98 return -ENODEV; 99 } 100 101 return 0; 102 } 103 104 /* -------------------------------------------------------------------------- 105 FS Interface (/proc) 106 -------------------------------------------------------------------------- */ 107 108 static struct proc_dir_entry *acpi_ac_dir; 109 110 static int acpi_ac_seq_show(struct seq_file *seq, void *offset) 111 { 112 struct acpi_ac *ac = (struct acpi_ac *)seq->private; 113 114 115 if (!ac) 116 return 0; 117 118 if (acpi_ac_get_state(ac)) { 119 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); 120 return 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 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; 147 148 149 if (!acpi_device_dir(device)) { 150 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 151 acpi_ac_dir); 152 if (!acpi_device_dir(device)) 153 return -ENODEV; 154 acpi_device_dir(device)->owner = THIS_MODULE; 155 } 156 157 /* 'state' [R] */ 158 entry = create_proc_entry(ACPI_AC_FILE_STATE, 159 S_IRUGO, acpi_device_dir(device)); 160 if (!entry) 161 return -ENODEV; 162 else { 163 entry->proc_fops = &acpi_ac_fops; 164 entry->data = acpi_driver_data(device); 165 entry->owner = THIS_MODULE; 166 } 167 168 return 0; 169 } 170 171 static int acpi_ac_remove_fs(struct acpi_device *device) 172 { 173 174 if (acpi_device_dir(device)) { 175 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device)); 176 177 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir); 178 acpi_device_dir(device) = NULL; 179 } 180 181 return 0; 182 } 183 184 /* -------------------------------------------------------------------------- 185 Driver Model 186 -------------------------------------------------------------------------- */ 187 188 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data) 189 { 190 struct acpi_ac *ac = (struct acpi_ac *)data; 191 struct acpi_device *device = NULL; 192 193 194 if (!ac) 195 return; 196 197 device = ac->device; 198 switch (event) { 199 case ACPI_AC_NOTIFY_STATUS: 200 case ACPI_NOTIFY_BUS_CHECK: 201 case ACPI_NOTIFY_DEVICE_CHECK: 202 acpi_ac_get_state(ac); 203 acpi_bus_generate_event(device, event, (u32) ac->state); 204 break; 205 default: 206 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 207 "Unsupported event [0x%x]\n", event)); 208 break; 209 } 210 211 return; 212 } 213 214 static int acpi_ac_add(struct acpi_device *device) 215 { 216 int result = 0; 217 acpi_status status = AE_OK; 218 struct acpi_ac *ac = NULL; 219 220 221 if (!device) 222 return -EINVAL; 223 224 ac = kmalloc(sizeof(struct acpi_ac), GFP_KERNEL); 225 if (!ac) 226 return -ENOMEM; 227 memset(ac, 0, sizeof(struct acpi_ac)); 228 229 ac->device = device; 230 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); 231 strcpy(acpi_device_class(device), ACPI_AC_CLASS); 232 acpi_driver_data(device) = ac; 233 234 result = acpi_ac_get_state(ac); 235 if (result) 236 goto end; 237 238 result = acpi_ac_add_fs(device); 239 if (result) 240 goto end; 241 242 status = acpi_install_notify_handler(device->handle, 243 ACPI_ALL_NOTIFY, acpi_ac_notify, 244 ac); 245 if (ACPI_FAILURE(status)) { 246 result = -ENODEV; 247 goto end; 248 } 249 250 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 251 acpi_device_name(device), acpi_device_bid(device), 252 ac->state ? "on-line" : "off-line"); 253 254 end: 255 if (result) { 256 acpi_ac_remove_fs(device); 257 kfree(ac); 258 } 259 260 return result; 261 } 262 263 static int acpi_ac_remove(struct acpi_device *device, int type) 264 { 265 acpi_status status = AE_OK; 266 struct acpi_ac *ac = NULL; 267 268 269 if (!device || !acpi_driver_data(device)) 270 return -EINVAL; 271 272 ac = (struct acpi_ac *)acpi_driver_data(device); 273 274 status = acpi_remove_notify_handler(device->handle, 275 ACPI_ALL_NOTIFY, acpi_ac_notify); 276 277 acpi_ac_remove_fs(device); 278 279 kfree(ac); 280 281 return 0; 282 } 283 284 static int __init acpi_ac_init(void) 285 { 286 int result; 287 288 289 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