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 <asm/uaccess.h>
  32
  33 #include <acpi/acpi_bus.h>
  34 #include <acpi/acpi_drivers.h>
  35
  36
  37 #define ACPI_FAN_COMPONENT              0x00200000
  38 #define ACPI_FAN_CLASS                  "fan"
  39 #define ACPI_FAN_HID                    "PNP0C0B"
  40 #define ACPI_FAN_DRIVER_NAME            "ACPI Fan Driver"
  41 #define ACPI_FAN_DEVICE_NAME            "Fan"
  42 #define ACPI_FAN_FILE_STATE             "state"
  43 #define ACPI_FAN_NOTIFY_STATUS          0x80
  44
  45 #define _COMPONENT              ACPI_FAN_COMPONENT
  46 ACPI_MODULE_NAME                ("acpi_fan")
  47
  48 MODULE_AUTHOR("Paul Diefenbaugh");
  49 MODULE_DESCRIPTION(ACPI_FAN_DRIVER_NAME);
  50 MODULE_LICENSE("GPL");
  51
  52 int acpi_fan_add (struct acpi_device *device);
  53 int acpi_fan_remove (struct acpi_device *device, int type);
  54
  55 static struct acpi_driver acpi_fan_driver = {
  56         .name =         ACPI_FAN_DRIVER_NAME,
  57         .class =        ACPI_FAN_CLASS,
  58         .ids =          ACPI_FAN_HID,
  59         .ops =          {
  60                                 .add =          acpi_fan_add,
  61                                 .remove =       acpi_fan_remove,
  62                         },
  63 };
  64
  65 struct acpi_fan {
  66         acpi_handle             handle;
  67 };
  68
  69
  70 /* --------------------------------------------------------------------------
  71                               FS Interface (/proc)
  72    -------------------------------------------------------------------------- */
  73
  74 struct proc_dir_entry           *acpi_fan_dir;
  75
  76
  77 static int
  78 acpi_fan_read_state (
  79         char                    *page,
  80         char                    **start,
  81         off_t                   off,
  82         int                     count,
  83         int                     *eof,
  84         void                    *data)
  85 {
  86         struct acpi_fan         *fan = (struct acpi_fan *) data;
  87         char                    *p = page;
  88         int                     len = 0;
  89         int                     state = 0;
  90
  91         ACPI_FUNCTION_TRACE("acpi_fan_read_state");
  92
  93         if (!fan || (off != 0))
  94                 goto end;
  95
  96         if (acpi_bus_get_power(fan->handle, &state))
  97                 goto end;
  98
  99         p += sprintf(p, "status:                  %s\n",
 100                 !state?"on":"off");
 101
 102 end:
 103         len = (p - page);
 104         if (len <= off+count) *eof = 1;
 105         *start = page + off;
 106         len -= off;
 107         if (len>count) len = count;
 108         if (len<0) len = 0;
 109
 110         return_VALUE(len);
 111 }
 112
 113
 114 static int
 115 acpi_fan_write_state (
 116         struct file             *file,
 117         const char              __user *buffer,
 118         unsigned long           count,
 119         void                    *data)
 120 {
 121         int                     result = 0;
 122         struct acpi_fan         *fan = (struct acpi_fan *) data;
 123         char                    state_string[12] = {'\0'};
 124
 125         ACPI_FUNCTION_TRACE("acpi_fan_write_state");
 126
 127         if (!fan || (count > sizeof(state_string) - 1))
 128                 return_VALUE(-EINVAL);
 129
 130         if (copy_from_user(state_string, buffer, count))
 131                 return_VALUE(-EFAULT);
 132
 133         state_string[count] = '\0';
 134
 135         result = acpi_bus_set_power(fan->handle,
 136                 simple_strtoul(state_string, NULL, 0));
 137         if (result)
 138                 return_VALUE(result);
 139
 140         return_VALUE(count);
 141 }
 142
 143
 144 static int
 145 acpi_fan_add_fs (
 146         struct acpi_device      *device)
 147 {
 148         struct proc_dir_entry   *entry = NULL;
 149
 150         ACPI_FUNCTION_TRACE("acpi_fan_add_fs");
 151
 152         if (!device)
 153                 return_VALUE(-EINVAL);
 154
 155         if (!acpi_device_dir(device)) {
 156                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 157                         acpi_fan_dir);
 158                 if (!acpi_device_dir(device))
 159                         return_VALUE(-ENODEV);
 160                 acpi_device_dir(device)->owner = THIS_MODULE;
 161         }
 162
 163         /* 'status' [R/W] */
 164         entry = create_proc_entry(ACPI_FAN_FILE_STATE,
 165                 S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
 166         if (!entry)
 167                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 168                         "Unable to create '%s' fs entry\n",
 169                         ACPI_FAN_FILE_STATE));
 170         else {
 171                 entry->read_proc = acpi_fan_read_state;
 172                 entry->write_proc = acpi_fan_write_state;
 173                 entry->data = acpi_driver_data(device);
 174                 entry->owner = THIS_MODULE;
 175         }
 176
 177         return_VALUE(0);
 178 }
 179
 180
 181 static int
 182 acpi_fan_remove_fs (
 183         struct acpi_device      *device)
 184 {
 185         ACPI_FUNCTION_TRACE("acpi_fan_remove_fs");
 186
 187         if (acpi_device_dir(device)) {
 188                 remove_proc_entry(ACPI_FAN_FILE_STATE,
 189                                   acpi_device_dir(device));
 190                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
 191                 acpi_device_dir(device) = NULL;
 192         }
 193
 194         return_VALUE(0);
 195 }
 196
 197
 198 /* --------------------------------------------------------------------------
 199                                  Driver Interface
 200    -------------------------------------------------------------------------- */
 201
 202 int
 203 acpi_fan_add (
 204         struct acpi_device      *device)
 205 {
 206         int                     result = 0;
 207         struct acpi_fan         *fan = NULL;
 208         int                     state = 0;
 209
 210         ACPI_FUNCTION_TRACE("acpi_fan_add");
 211
 212         if (!device)
 213                 return_VALUE(-EINVAL);
 214
 215         fan = kmalloc(sizeof(struct acpi_fan), GFP_KERNEL);
 216         if (!fan)
 217                 return_VALUE(-ENOMEM);
 218         memset(fan, 0, sizeof(struct acpi_fan));
 219
 220         fan->handle = device->handle;
 221         strcpy(acpi_device_name(device), ACPI_FAN_DEVICE_NAME);
 222         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
 223         acpi_driver_data(device) = fan;
 224
 225         result = acpi_bus_get_power(fan->handle, &state);
 226         if (result) {
 227                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 228                         "Error reading power state\n"));
 229                 goto end;
 230         }
 231
 232         result = acpi_fan_add_fs(device);
 233         if (result)
 234                 goto end;
 235
 236         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 237                 acpi_device_name(device), acpi_device_bid(device),
 238                 !device->power.state?"on":"off");
 239
 240 end:
 241         if (result)
 242                 kfree(fan);
 243
 244         return_VALUE(result);
 245 }
 246
 247
 248 int
 249 acpi_fan_remove (
 250         struct acpi_device      *device,
 251         int                     type)
 252 {
 253         struct acpi_fan         *fan = NULL;
 254
 255         ACPI_FUNCTION_TRACE("acpi_fan_remove");
 256
 257         if (!device || !acpi_driver_data(device))
 258                 return_VALUE(-EINVAL);
 259
 260         fan = (struct acpi_fan *) acpi_driver_data(device);
 261
 262         acpi_fan_remove_fs(device);
 263
 264         kfree(fan);
 265
 266         return_VALUE(0);
 267 }
 268
 269
 270 int __init
 271 acpi_fan_init (void)
 272 {
 273         int                     result = 0;
 274
 275         ACPI_FUNCTION_TRACE("acpi_fan_init");
 276
 277         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
 278         if (!acpi_fan_dir)
 279                 return_VALUE(-ENODEV);
 280         acpi_fan_dir->owner = THIS_MODULE;
 281
 282         result = acpi_bus_register_driver(&acpi_fan_driver);
 283         if (result < 0) {
 284                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 285                 return_VALUE(-ENODEV);
 286         }
 287
 288         return_VALUE(0);
 289 }
 290
 291
 292 void __exit
 293 acpi_fan_exit (void)
 294 {
 295         ACPI_FUNCTION_TRACE("acpi_fan_exit");
 296
 297         acpi_bus_unregister_driver(&acpi_fan_driver);
 298
 299         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 300
 301         return_VOID;
 302 }
 303
 304
 305 module_init(acpi_fan_init);
 306 module_exit(acpi_fan_exit);
 307