err.no Git - linux-2.6/blob - drivers/acpi/fan.c

   1 /*
   2  *  acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
   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 <asm/uaccess.h>
  33
  34 #include <acpi/acpi_bus.h>
  35 #include <acpi/acpi_drivers.h>
  36
  37
  38 #define ACPI_FAN_COMPONENT              0x00200000
  39 #define ACPI_FAN_CLASS                  "fan"
  40 #define ACPI_FAN_DRIVER_NAME            "ACPI Fan Driver"
  41 #define ACPI_FAN_FILE_STATE             "state"
  42
  43 #define _COMPONENT              ACPI_FAN_COMPONENT
  44 ACPI_MODULE_NAME                ("acpi_fan")
  45
  46 MODULE_AUTHOR("Paul Diefenbaugh");
  47 MODULE_DESCRIPTION(ACPI_FAN_DRIVER_NAME);
  48 MODULE_LICENSE("GPL");
  49
  50 static int acpi_fan_add (struct acpi_device *device);
  51 static int acpi_fan_remove (struct acpi_device *device, int type);
  52
  53 static struct acpi_driver acpi_fan_driver = {
  54         .name =         ACPI_FAN_DRIVER_NAME,
  55         .class =        ACPI_FAN_CLASS,
  56         .ids =          "PNP0C0B",
  57         .ops =          {
  58                                 .add =          acpi_fan_add,
  59                                 .remove =       acpi_fan_remove,
  60                         },
  61 };
  62
  63 struct acpi_fan {
  64         acpi_handle             handle;
  65 };
  66
  67
  68 /* --------------------------------------------------------------------------
  69                               FS Interface (/proc)
  70    -------------------------------------------------------------------------- */
  71
  72 static struct proc_dir_entry    *acpi_fan_dir;
  73
  74
  75 static int
  76 acpi_fan_read_state(struct seq_file *seq, void *offset)
  77 {
  78         struct acpi_fan         *fan = seq->private;
  79         int                     state = 0;
  80
  81         ACPI_FUNCTION_TRACE("acpi_fan_read_state");
  82
  83         if (fan) {
  84                 if (acpi_bus_get_power(fan->handle, &state))
  85                         seq_printf(seq, "status:                  ERROR\n");
  86                 else
  87                         seq_printf(seq, "status:                  %s\n",
  88                                      !state?"on":"off");
  89         }
  90         return_VALUE(0);
  91 }
  92
  93 static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
  94 {
  95         return single_open(file, acpi_fan_read_state, PDE(inode)->data);
  96 }
  97
  98 static ssize_t
  99 acpi_fan_write_state(struct file *file, const char __user *buffer,
 100                      size_t count, loff_t *ppos)
 101 {
 102         int                     result = 0;
 103         struct seq_file         *m = (struct seq_file *)file->private_data;
 104         struct acpi_fan         *fan = (struct acpi_fan *) m->private;
 105         char                    state_string[12] = {'\0'};
 106
 107         ACPI_FUNCTION_TRACE("acpi_fan_write_state");
 108
 109         if (!fan || (count > sizeof(state_string) - 1))
 110                 return_VALUE(-EINVAL);
 111
 112         if (copy_from_user(state_string, buffer, count))
 113                 return_VALUE(-EFAULT);
 114
 115         state_string[count] = '\0';
 116
 117         result = acpi_bus_set_power(fan->handle,
 118                 simple_strtoul(state_string, NULL, 0));
 119         if (result)
 120                 return_VALUE(result);
 121
 122         return_VALUE(count);
 123 }
 124
 125 static struct file_operations acpi_fan_state_ops = {
 126         .open           = acpi_fan_state_open_fs,
 127         .read           = seq_read,
 128         .write          = acpi_fan_write_state,
 129         .llseek         = seq_lseek,
 130         .release        = single_release,
 131         .owner = THIS_MODULE,
 132 };
 133
 134 static int
 135 acpi_fan_add_fs(struct acpi_device *device)
 136 {
 137         struct proc_dir_entry   *entry = NULL;
 138
 139         ACPI_FUNCTION_TRACE("acpi_fan_add_fs");
 140
 141         if (!device)
 142                 return_VALUE(-EINVAL);
 143
 144         if (!acpi_device_dir(device)) {
 145                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 146                         acpi_fan_dir);
 147                 if (!acpi_device_dir(device))
 148                         return_VALUE(-ENODEV);
 149                 acpi_device_dir(device)->owner = THIS_MODULE;
 150         }
 151
 152         /* 'status' [R/W] */
 153         entry = create_proc_entry(ACPI_FAN_FILE_STATE,
 154                 S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
 155         if (!entry)
 156                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 157                         "Unable to create '%s' fs entry\n",
 158                         ACPI_FAN_FILE_STATE));
 159         else {
 160                 entry->proc_fops = &acpi_fan_state_ops;
 161                 entry->data = acpi_driver_data(device);
 162                 entry->owner = THIS_MODULE;
 163         }
 164
 165         return_VALUE(0);
 166 }
 167
 168
 169 static int
 170 acpi_fan_remove_fs(struct acpi_device *device)
 171 {
 172         ACPI_FUNCTION_TRACE("acpi_fan_remove_fs");
 173
 174         if (acpi_device_dir(device)) {
 175                 remove_proc_entry(ACPI_FAN_FILE_STATE,
 176                                   acpi_device_dir(device));
 177                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
 178                 acpi_device_dir(device) = NULL;
 179         }
 180
 181         return_VALUE(0);
 182 }
 183
 184
 185 /* --------------------------------------------------------------------------
 186                                  Driver Interface
 187    -------------------------------------------------------------------------- */
 188
 189 static int
 190 acpi_fan_add(struct acpi_device *device)
 191 {
 192         int                     result = 0;
 193         struct acpi_fan         *fan = NULL;
 194         int                     state = 0;
 195
 196         ACPI_FUNCTION_TRACE("acpi_fan_add");
 197
 198         if (!device)
 199                 return_VALUE(-EINVAL);
 200
 201         fan = kmalloc(sizeof(struct acpi_fan), GFP_KERNEL);
 202         if (!fan)
 203                 return_VALUE(-ENOMEM);
 204         memset(fan, 0, sizeof(struct acpi_fan));
 205
 206         fan->handle = device->handle;
 207         strcpy(acpi_device_name(device), "Fan");
 208         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
 209         acpi_driver_data(device) = fan;
 210
 211         result = acpi_bus_get_power(fan->handle, &state);
 212         if (result) {
 213                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 214                         "Error reading power state\n"));
 215                 goto end;
 216         }
 217
 218         result = acpi_fan_add_fs(device);
 219         if (result)
 220                 goto end;
 221
 222         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 223                 acpi_device_name(device), acpi_device_bid(device),
 224                 !device->power.state?"on":"off");
 225
 226 end:
 227         if (result)
 228                 kfree(fan);
 229
 230         return_VALUE(result);
 231 }
 232
 233
 234 static int
 235 acpi_fan_remove(struct acpi_device *device, int type)
 236 {
 237         struct acpi_fan *fan = NULL;
 238
 239         ACPI_FUNCTION_TRACE("acpi_fan_remove");
 240
 241         if (!device || !acpi_driver_data(device))
 242                 return_VALUE(-EINVAL);
 243
 244         fan = (struct acpi_fan *) acpi_driver_data(device);
 245
 246         acpi_fan_remove_fs(device);
 247
 248         kfree(fan);
 249
 250         return_VALUE(0);
 251 }
 252
 253
 254 static int __init
 255 acpi_fan_init(void)
 256 {
 257         int result = 0;
 258
 259         ACPI_FUNCTION_TRACE("acpi_fan_init");
 260
 261         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
 262         if (!acpi_fan_dir)
 263                 return_VALUE(-ENODEV);
 264         acpi_fan_dir->owner = THIS_MODULE;
 265
 266         result = acpi_bus_register_driver(&acpi_fan_driver);
 267         if (result < 0) {
 268                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 269                 return_VALUE(-ENODEV);
 270         }
 271
 272         return_VALUE(0);
 273 }
 274
 275
 276 static void __exit
 277 acpi_fan_exit(void)
 278 {
 279         ACPI_FUNCTION_TRACE("acpi_fan_exit");
 280
 281         acpi_bus_unregister_driver(&acpi_fan_driver);
 282
 283         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 284
 285         return_VOID;
 286 }
 287
 288
 289 module_init(acpi_fan_init);
 290 module_exit(acpi_fan_exit);
 291