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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 #define ACPI_FAN_COMPONENT              0x00200000
  38 #define ACPI_FAN_CLASS                  "fan"
  39 #define ACPI_FAN_FILE_STATE             "state"
  40
  41 #define _COMPONENT              ACPI_FAN_COMPONENT
  42 ACPI_MODULE_NAME("fan");
  43
  44 MODULE_AUTHOR("Paul Diefenbaugh");
  45 MODULE_DESCRIPTION("ACPI Fan Driver");
  46 MODULE_LICENSE("GPL");
  47
  48 static int acpi_fan_add(struct acpi_device *device);
  49 static int acpi_fan_remove(struct acpi_device *device, int type);
  50 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state);
  51 static int acpi_fan_resume(struct acpi_device *device);
  52
  53 static struct acpi_driver acpi_fan_driver = {
  54         .name = "fan",
  55         .class = ACPI_FAN_CLASS,
  56         .ids = "PNP0C0B",
  57         .ops = {
  58                 .add = acpi_fan_add,
  59                 .remove = acpi_fan_remove,
  60                 .suspend = acpi_fan_suspend,
  61                 .resume = acpi_fan_resume,
  62                 },
  63 };
  64
  65 struct acpi_fan {
  66         struct acpi_device * device;
  67 };
  68
  69 /* --------------------------------------------------------------------------
  70                               FS Interface (/proc)
  71    -------------------------------------------------------------------------- */
  72
  73 static struct proc_dir_entry *acpi_fan_dir;
  74
  75 static int acpi_fan_read_state(struct seq_file *seq, void *offset)
  76 {
  77         struct acpi_fan *fan = seq->private;
  78         int state = 0;
  79
  80
  81         if (fan) {
  82                 if (acpi_bus_get_power(fan->device->handle, &state))
  83                         seq_printf(seq, "status:                  ERROR\n");
  84                 else
  85                         seq_printf(seq, "status:                  %s\n",
  86                                    !state ? "on" : "off");
  87         }
  88         return 0;
  89 }
  90
  91 static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
  92 {
  93         return single_open(file, acpi_fan_read_state, PDE(inode)->data);
  94 }
  95
  96 static ssize_t
  97 acpi_fan_write_state(struct file *file, const char __user * buffer,
  98                      size_t count, loff_t * ppos)
  99 {
 100         int result = 0;
 101         struct seq_file *m = file->private_data;
 102         struct acpi_fan *fan = m->private;
 103         char state_string[12] = { '\0' };
 104
 105
 106         if (!fan || (count > sizeof(state_string) - 1))
 107                 return -EINVAL;
 108
 109         if (copy_from_user(state_string, buffer, count))
 110                 return -EFAULT;
 111
 112         state_string[count] = '\0';
 113
 114         result = acpi_bus_set_power(fan->device->handle,
 115                                     simple_strtoul(state_string, NULL, 0));
 116         if (result)
 117                 return result;
 118
 119         return count;
 120 }
 121
 122 static const struct file_operations acpi_fan_state_ops = {
 123         .open = acpi_fan_state_open_fs,
 124         .read = seq_read,
 125         .write = acpi_fan_write_state,
 126         .llseek = seq_lseek,
 127         .release = single_release,
 128         .owner = THIS_MODULE,
 129 };
 130
 131 static int acpi_fan_add_fs(struct acpi_device *device)
 132 {
 133         struct proc_dir_entry *entry = NULL;
 134
 135
 136         if (!device)
 137                 return -EINVAL;
 138
 139         if (!acpi_device_dir(device)) {
 140                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 141                                                      acpi_fan_dir);
 142                 if (!acpi_device_dir(device))
 143                         return -ENODEV;
 144                 acpi_device_dir(device)->owner = THIS_MODULE;
 145         }
 146
 147         /* 'status' [R/W] */
 148         entry = create_proc_entry(ACPI_FAN_FILE_STATE,
 149                                   S_IFREG | S_IRUGO | S_IWUSR,
 150                                   acpi_device_dir(device));
 151         if (!entry)
 152                 return -ENODEV;
 153         else {
 154                 entry->proc_fops = &acpi_fan_state_ops;
 155                 entry->data = acpi_driver_data(device);
 156                 entry->owner = THIS_MODULE;
 157         }
 158
 159         return 0;
 160 }
 161
 162 static int acpi_fan_remove_fs(struct acpi_device *device)
 163 {
 164
 165         if (acpi_device_dir(device)) {
 166                 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
 167                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
 168                 acpi_device_dir(device) = NULL;
 169         }
 170
 171         return 0;
 172 }
 173
 174 /* --------------------------------------------------------------------------
 175                                  Driver Interface
 176    -------------------------------------------------------------------------- */
 177
 178 static int acpi_fan_add(struct acpi_device *device)
 179 {
 180         int result = 0;
 181         struct acpi_fan *fan = NULL;
 182         int state = 0;
 183
 184
 185         if (!device)
 186                 return -EINVAL;
 187
 188         fan = kzalloc(sizeof(struct acpi_fan), GFP_KERNEL);
 189         if (!fan)
 190                 return -ENOMEM;
 191
 192         fan->device = device;
 193         strcpy(acpi_device_name(device), "Fan");
 194         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
 195         acpi_driver_data(device) = fan;
 196
 197         result = acpi_bus_get_power(device->handle, &state);
 198         if (result) {
 199                 printk(KERN_ERR PREFIX "Reading power state\n");
 200                 goto end;
 201         }
 202
 203         device->flags.force_power_state = 1;
 204         acpi_bus_set_power(device->handle, state);
 205         device->flags.force_power_state = 0;
 206
 207         result = acpi_fan_add_fs(device);
 208         if (result)
 209                 goto end;
 210
 211         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 212                acpi_device_name(device), acpi_device_bid(device),
 213                !device->power.state ? "on" : "off");
 214
 215       end:
 216         if (result)
 217                 kfree(fan);
 218
 219         return result;
 220 }
 221
 222 static int acpi_fan_remove(struct acpi_device *device, int type)
 223 {
 224         struct acpi_fan *fan = NULL;
 225
 226
 227         if (!device || !acpi_driver_data(device))
 228                 return -EINVAL;
 229
 230         fan = acpi_driver_data(device);
 231
 232         acpi_fan_remove_fs(device);
 233
 234         kfree(fan);
 235
 236         return 0;
 237 }
 238
 239 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
 240 {
 241         if (!device)
 242                 return -EINVAL;
 243
 244         acpi_bus_set_power(device->handle, ACPI_STATE_D0);
 245
 246         return AE_OK;
 247 }
 248
 249 static int acpi_fan_resume(struct acpi_device *device)
 250 {
 251         int result = 0;
 252         int power_state = 0;
 253
 254         if (!device)
 255                 return -EINVAL;
 256
 257         result = acpi_bus_get_power(device->handle, &power_state);
 258         if (result) {
 259                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 260                                   "Error reading fan power state\n"));
 261                 return result;
 262         }
 263
 264         device->flags.force_power_state = 1;
 265         acpi_bus_set_power(device->handle, power_state);
 266         device->flags.force_power_state = 0;
 267
 268         return result;
 269 }
 270
 271 static int __init acpi_fan_init(void)
 272 {
 273         int result = 0;
 274
 275
 276         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
 277         if (!acpi_fan_dir)
 278                 return -ENODEV;
 279         acpi_fan_dir->owner = THIS_MODULE;
 280
 281         result = acpi_bus_register_driver(&acpi_fan_driver);
 282         if (result < 0) {
 283                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 284                 return -ENODEV;
 285         }
 286
 287         return 0;
 288 }
 289
 290 static void __exit acpi_fan_exit(void)
 291 {
 292
 293         acpi_bus_unregister_driver(&acpi_fan_driver);
 294
 295         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 296
 297         return;
 298 }
 299
 300 module_init(acpi_fan_init);
 301 module_exit(acpi_fan_exit);