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