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