SAFE public projects git trees. - safe/jmp/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 #define ACPI_FAN_COMPONENT              0x00200000
  38 #define ACPI_FAN_CLASS                  "fan"
  39 #define ACPI_FAN_DRIVER_NAME            "ACPI Fan Driver"
  40 #define ACPI_FAN_FILE_STATE             "state"
  41
  42 #define _COMPONENT              ACPI_FAN_COMPONENT
  43 ACPI_MODULE_NAME("acpi_fan")
  44
  45     MODULE_AUTHOR("Paul Diefenbaugh");
  46 MODULE_DESCRIPTION(ACPI_FAN_DRIVER_NAME);
  47 MODULE_LICENSE("GPL");
  48
  49 static int acpi_fan_add(struct acpi_device *device);
  50 static int acpi_fan_remove(struct acpi_device *device, int type);
  51 static int acpi_fan_suspend(struct acpi_device *device, int state);
  52 static int acpi_fan_resume(struct acpi_device *device, int state);
  53
  54 static struct acpi_driver acpi_fan_driver = {
  55         .name = ACPI_FAN_DRIVER_NAME,
  56         .class = ACPI_FAN_CLASS,
  57         .ids = "PNP0C0B",
  58         .ops = {
  59                 .add = acpi_fan_add,
  60                 .remove = acpi_fan_remove,
  61                 .suspend = acpi_fan_suspend,
  62                 .resume = acpi_fan_resume,
  63                 },
  64 };
  65
  66 struct acpi_fan {
  67         acpi_handle handle;
  68         struct acpi_device * device;
  69 };
  70
  71 /* --------------------------------------------------------------------------
  72                               FS Interface (/proc)
  73    -------------------------------------------------------------------------- */
  74
  75 static struct proc_dir_entry *acpi_fan_dir;
  76
  77 static int acpi_fan_read_state(struct seq_file *seq, void *offset)
  78 {
  79         struct acpi_fan *fan = seq->private;
  80         int state = 0;
  81
  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 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
 108         if (!fan || (count > sizeof(state_string) - 1))
 109                 return -EINVAL;
 110
 111         if (copy_from_user(state_string, buffer, count))
 112                 return -EFAULT;
 113
 114         state_string[count] = '\0';
 115
 116         result = acpi_bus_set_power(fan->handle,
 117                                     simple_strtoul(state_string, NULL, 0));
 118         if (result)
 119                 return result;
 120
 121         return count;
 122 }
 123
 124 static struct file_operations acpi_fan_state_ops = {
 125         .open = acpi_fan_state_open_fs,
 126         .read = seq_read,
 127         .write = acpi_fan_write_state,
 128         .llseek = seq_lseek,
 129         .release = single_release,
 130         .owner = THIS_MODULE,
 131 };
 132
 133 static int acpi_fan_add_fs(struct acpi_device *device)
 134 {
 135         struct proc_dir_entry *entry = NULL;
 136
 137
 138         if (!device)
 139                 return -EINVAL;
 140
 141         if (!acpi_device_dir(device)) {
 142                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 143                                                      acpi_fan_dir);
 144                 if (!acpi_device_dir(device))
 145                         return -ENODEV;
 146                 acpi_device_dir(device)->owner = THIS_MODULE;
 147         }
 148
 149         /* 'status' [R/W] */
 150         entry = create_proc_entry(ACPI_FAN_FILE_STATE,
 151                                   S_IFREG | S_IRUGO | S_IWUSR,
 152                                   acpi_device_dir(device));
 153         if (!entry)
 154                 return -ENODEV;
 155         else {
 156                 entry->proc_fops = &acpi_fan_state_ops;
 157                 entry->data = acpi_driver_data(device);
 158                 entry->owner = THIS_MODULE;
 159         }
 160
 161         return 0;
 162 }
 163
 164 static int acpi_fan_remove_fs(struct acpi_device *device)
 165 {
 166
 167         if (acpi_device_dir(device)) {
 168                 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
 169                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
 170                 acpi_device_dir(device) = NULL;
 171         }
 172
 173         return 0;
 174 }
 175
 176 /* --------------------------------------------------------------------------
 177                                  Driver Interface
 178    -------------------------------------------------------------------------- */
 179
 180 static int acpi_fan_add(struct acpi_device *device)
 181 {
 182         int result = 0;
 183         struct acpi_fan *fan = NULL;
 184         int state = 0;
 185
 186
 187         if (!device)
 188                 return -EINVAL;
 189
 190         fan = kmalloc(sizeof(struct acpi_fan), GFP_KERNEL);
 191         if (!fan)
 192                 return -ENOMEM;
 193         memset(fan, 0, sizeof(struct acpi_fan));
 194
 195         fan->handle = device->handle;
 196         fan->device = device;
 197         strcpy(acpi_device_name(device), "Fan");
 198         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
 199         acpi_driver_data(device) = fan;
 200
 201         result = acpi_bus_get_power(fan->handle, &state);
 202         if (result) {
 203                 printk(KERN_ERR PREFIX "Reading power state\n");
 204                 goto end;
 205         }
 206
 207         device->flags.force_power_state = 1;
 208         acpi_bus_set_power(device->handle, state);
 209         device->flags.force_power_state = 0;
 210
 211         result = acpi_fan_add_fs(device);
 212         if (result)
 213                 goto end;
 214
 215         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 216                acpi_device_name(device), acpi_device_bid(device),
 217                !device->power.state ? "on" : "off");
 218
 219       end:
 220         if (result)
 221                 kfree(fan);
 222
 223         return result;
 224 }
 225
 226 static int acpi_fan_remove(struct acpi_device *device, int type)
 227 {
 228         struct acpi_fan *fan = NULL;
 229
 230
 231         if (!device || !acpi_driver_data(device))
 232                 return -EINVAL;
 233
 234         fan = (struct acpi_fan *)acpi_driver_data(device);
 235
 236         acpi_fan_remove_fs(device);
 237
 238         kfree(fan);
 239
 240         return 0;
 241 }
 242
 243 static int acpi_fan_suspend(struct acpi_device *device, int state)
 244 {
 245         if (!device)
 246                 return -EINVAL;
 247
 248         acpi_bus_set_power(device->handle, ACPI_STATE_D0);
 249
 250         return AE_OK;
 251 }
 252
 253 static int acpi_fan_resume(struct acpi_device *device, int state)
 254 {
 255         int result = 0;
 256         int power_state = 0;
 257
 258         if (!device)
 259                 return -EINVAL;
 260
 261         result = acpi_bus_get_power(device->handle, &power_state);
 262         if (result) {
 263                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 264                                   "Error reading fan power state\n"));
 265                 return result;
 266         }
 267
 268         device->flags.force_power_state = 1;
 269         acpi_bus_set_power(device->handle, power_state);
 270         device->flags.force_power_state = 0;
 271
 272         return result;
 273 }
 274
 275 static int __init acpi_fan_init(void)
 276 {
 277         int result = 0;
 278
 279
 280         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
 281         if (!acpi_fan_dir)
 282                 return -ENODEV;
 283         acpi_fan_dir->owner = THIS_MODULE;
 284
 285         result = acpi_bus_register_driver(&acpi_fan_driver);
 286         if (result < 0) {
 287                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 288                 return -ENODEV;
 289         }
 290
 291         return 0;
 292 }
 293
 294 static void __exit acpi_fan_exit(void)
 295 {
 296
 297         acpi_bus_unregister_driver(&acpi_fan_driver);
 298
 299         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 300
 301         return;
 302 }
 303
 304 module_init(acpi_fan_init);
 305 module_exit(acpi_fan_exit);