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   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_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
  95                 ac->state = ACPI_AC_STATUS_UNKNOWN;
  96                 return_VALUE(-ENODEV);
  97         }
  98
  99         return_VALUE(0);
 100 }
 101
 102 /* --------------------------------------------------------------------------
 103                               FS Interface (/proc)
 104    -------------------------------------------------------------------------- */
 105
 106 static struct proc_dir_entry *acpi_ac_dir;
 107
 108 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 109 {
 110         struct acpi_ac *ac = (struct acpi_ac *)seq->private;
 111
 112         ACPI_FUNCTION_TRACE("acpi_ac_seq_show");
 113
 114         if (!ac)
 115                 return_VALUE(0);
 116
 117         if (acpi_ac_get_state(ac)) {
 118                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 119                 return_VALUE(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_VALUE(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         ACPI_FUNCTION_TRACE("acpi_ac_add_fs");
 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_VALUE(-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_VALUE(-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_VALUE(0);
 169 }
 170
 171 static int acpi_ac_remove_fs(struct acpi_device *device)
 172 {
 173         ACPI_FUNCTION_TRACE("acpi_ac_remove_fs");
 174
 175         if (acpi_device_dir(device)) {
 176                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
 177
 178                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
 179                 acpi_device_dir(device) = NULL;
 180         }
 181
 182         return_VALUE(0);
 183 }
 184
 185 /* --------------------------------------------------------------------------
 186                                    Driver Model
 187    -------------------------------------------------------------------------- */
 188
 189 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
 190 {
 191         struct acpi_ac *ac = (struct acpi_ac *)data;
 192         struct acpi_device *device = NULL;
 193
 194         ACPI_FUNCTION_TRACE("acpi_ac_notify");
 195
 196         if (!ac)
 197                 return_VOID;
 198
 199         if (acpi_bus_get_device(ac->handle, &device))
 200                 return_VOID;
 201
 202         switch (event) {
 203         case ACPI_AC_NOTIFY_STATUS:
 204                 acpi_ac_get_state(ac);
 205                 acpi_bus_generate_event(device, event, (u32) ac->state);
 206                 break;
 207         default:
 208                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 209                                   "Unsupported event [0x%x]\n", event));
 210                 break;
 211         }
 212
 213         return_VOID;
 214 }
 215
 216 static int acpi_ac_add(struct acpi_device *device)
 217 {
 218         int result = 0;
 219         acpi_status status = AE_OK;
 220         struct acpi_ac *ac = NULL;
 221
 222         ACPI_FUNCTION_TRACE("acpi_ac_add");
 223
 224         if (!device)
 225                 return_VALUE(-EINVAL);
 226
 227         ac = kmalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 228         if (!ac)
 229                 return_VALUE(-ENOMEM);
 230         memset(ac, 0, sizeof(struct acpi_ac));
 231
 232         ac->handle = device->handle;
 233         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 234         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 235         acpi_driver_data(device) = ac;
 236
 237         result = acpi_ac_get_state(ac);
 238         if (result)
 239                 goto end;
 240
 241         result = acpi_ac_add_fs(device);
 242         if (result)
 243                 goto end;
 244
 245         status = acpi_install_notify_handler(ac->handle,
 246                                              ACPI_DEVICE_NOTIFY, acpi_ac_notify,
 247                                              ac);
 248         if (ACPI_FAILURE(status)) {
 249                 result = -ENODEV;
 250                 goto end;
 251         }
 252
 253         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 254                acpi_device_name(device), acpi_device_bid(device),
 255                ac->state ? "on-line" : "off-line");
 256
 257       end:
 258         if (result) {
 259                 acpi_ac_remove_fs(device);
 260                 kfree(ac);
 261         }
 262
 263         return_VALUE(result);
 264 }
 265
 266 static int acpi_ac_remove(struct acpi_device *device, int type)
 267 {
 268         acpi_status status = AE_OK;
 269         struct acpi_ac *ac = NULL;
 270
 271         ACPI_FUNCTION_TRACE("acpi_ac_remove");
 272
 273         if (!device || !acpi_driver_data(device))
 274                 return_VALUE(-EINVAL);
 275
 276         ac = (struct acpi_ac *)acpi_driver_data(device);
 277
 278         status = acpi_remove_notify_handler(ac->handle,
 279                                             ACPI_DEVICE_NOTIFY, acpi_ac_notify);
 280
 281         acpi_ac_remove_fs(device);
 282
 283         kfree(ac);
 284
 285         return_VALUE(0);
 286 }
 287
 288 static int __init acpi_ac_init(void)
 289 {
 290         int result = 0;
 291
 292         ACPI_FUNCTION_TRACE("acpi_ac_init");
 293
 294         acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
 295         if (!acpi_ac_dir)
 296                 return_VALUE(-ENODEV);
 297         acpi_ac_dir->owner = THIS_MODULE;
 298
 299         result = acpi_bus_register_driver(&acpi_ac_driver);
 300         if (result < 0) {
 301                 remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
 302                 return_VALUE(-ENODEV);
 303         }
 304
 305         return_VALUE(0);
 306 }
 307
 308 static void __exit acpi_ac_exit(void)
 309 {
 310         ACPI_FUNCTION_TRACE("acpi_ac_exit");
 311
 312         acpi_bus_unregister_driver(&acpi_ac_driver);
 313
 314         remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
 315
 316         return_VOID;
 317 }
 318
 319 module_init(acpi_ac_init);
 320 module_exit(acpi_ac_exit);