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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_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
  52 static struct acpi_driver acpi_fan_driver = {
  53         .name = ACPI_FAN_DRIVER_NAME,
  54         .class = ACPI_FAN_CLASS,
  55         .ids = "PNP0C0B",
  56         .ops = {
  57                 .add = acpi_fan_add,
  58                 .remove = acpi_fan_remove,
  59                 },
  60 };
  61
  62 struct acpi_fan {
  63         acpi_handle handle;
  64 };
  65
  66 /* --------------------------------------------------------------------------
  67                               FS Interface (/proc)
  68    -------------------------------------------------------------------------- */
  69
  70 static struct proc_dir_entry *acpi_fan_dir;
  71
  72 static int acpi_fan_read_state(struct seq_file *seq, void *offset)
  73 {
  74         struct acpi_fan *fan = seq->private;
  75         int state = 0;
  76
  77         ACPI_FUNCTION_TRACE("acpi_fan_read_state");
  78
  79         if (fan) {
  80                 if (acpi_bus_get_power(fan->handle, &state))
  81                         seq_printf(seq, "status:                  ERROR\n");
  82                 else
  83                         seq_printf(seq, "status:                  %s\n",
  84                                    !state ? "on" : "off");
  85         }
  86         return_VALUE(0);
  87 }
  88
  89 static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
  90 {
  91         return single_open(file, acpi_fan_read_state, PDE(inode)->data);
  92 }
  93
  94 static ssize_t
  95 acpi_fan_write_state(struct file *file, const char __user * buffer,
  96                      size_t count, loff_t * ppos)
  97 {
  98         int result = 0;
  99         struct seq_file *m = (struct seq_file *)file->private_data;
 100         struct acpi_fan *fan = (struct acpi_fan *)m->private;
 101         char state_string[12] = { '\0' };
 102
 103         ACPI_FUNCTION_TRACE("acpi_fan_write_state");
 104
 105         if (!fan || (count > sizeof(state_string) - 1))
 106                 return_VALUE(-EINVAL);
 107
 108         if (copy_from_user(state_string, buffer, count))
 109                 return_VALUE(-EFAULT);
 110
 111         state_string[count] = '\0';
 112
 113         result = acpi_bus_set_power(fan->handle,
 114                                     simple_strtoul(state_string, NULL, 0));
 115         if (result)
 116                 return_VALUE(result);
 117
 118         return_VALUE(count);
 119 }
 120
 121 static struct file_operations acpi_fan_state_ops = {
 122         .open = acpi_fan_state_open_fs,
 123         .read = seq_read,
 124         .write = acpi_fan_write_state,
 125         .llseek = seq_lseek,
 126         .release = single_release,
 127         .owner = THIS_MODULE,
 128 };
 129
 130 static int acpi_fan_add_fs(struct acpi_device *device)
 131 {
 132         struct proc_dir_entry *entry = NULL;
 133
 134         ACPI_FUNCTION_TRACE("acpi_fan_add_fs");
 135
 136         if (!device)
 137                 return_VALUE(-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_VALUE(-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                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 153                                   "Unable to create '%s' fs entry\n",
 154                                   ACPI_FAN_FILE_STATE));
 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_VALUE(0);
 162 }
 163
 164 static int acpi_fan_remove_fs(struct acpi_device *device)
 165 {
 166         ACPI_FUNCTION_TRACE("acpi_fan_remove_fs");
 167
 168         if (acpi_device_dir(device)) {
 169                 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
 170                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
 171                 acpi_device_dir(device) = NULL;
 172         }
 173
 174         return_VALUE(0);
 175 }
 176
 177 /* --------------------------------------------------------------------------
 178                                  Driver Interface
 179    -------------------------------------------------------------------------- */
 180
 181 static int acpi_fan_add(struct acpi_device *device)
 182 {
 183         int result = 0;
 184         struct acpi_fan *fan = NULL;
 185         int state = 0;
 186
 187         ACPI_FUNCTION_TRACE("acpi_fan_add");
 188
 189         if (!device)
 190                 return_VALUE(-EINVAL);
 191
 192         fan = kmalloc(sizeof(struct acpi_fan), GFP_KERNEL);
 193         if (!fan)
 194                 return_VALUE(-ENOMEM);
 195         memset(fan, 0, sizeof(struct acpi_fan));
 196
 197         fan->handle = device->handle;
 198         strcpy(acpi_device_name(device), "Fan");
 199         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
 200         acpi_driver_data(device) = fan;
 201
 202         result = acpi_bus_get_power(fan->handle, &state);
 203         if (result) {
 204                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 205                                   "Error reading power state\n"));
 206                 goto end;
 207         }
 208
 209         result = acpi_fan_add_fs(device);
 210         if (result)
 211                 goto end;
 212
 213         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 214                acpi_device_name(device), acpi_device_bid(device),
 215                !device->power.state ? "on" : "off");
 216
 217       end:
 218         if (result)
 219                 kfree(fan);
 220
 221         return_VALUE(result);
 222 }
 223
 224 static int acpi_fan_remove(struct acpi_device *device, int type)
 225 {
 226         struct acpi_fan *fan = NULL;
 227
 228         ACPI_FUNCTION_TRACE("acpi_fan_remove");
 229
 230         if (!device || !acpi_driver_data(device))
 231                 return_VALUE(-EINVAL);
 232
 233         fan = (struct acpi_fan *)acpi_driver_data(device);
 234
 235         acpi_fan_remove_fs(device);
 236
 237         kfree(fan);
 238
 239         return_VALUE(0);
 240 }
 241
 242 static int __init acpi_fan_init(void)
 243 {
 244         int result = 0;
 245
 246         ACPI_FUNCTION_TRACE("acpi_fan_init");
 247
 248         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
 249         if (!acpi_fan_dir)
 250                 return_VALUE(-ENODEV);
 251         acpi_fan_dir->owner = THIS_MODULE;
 252
 253         result = acpi_bus_register_driver(&acpi_fan_driver);
 254         if (result < 0) {
 255                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 256                 return_VALUE(-ENODEV);
 257         }
 258
 259         return_VALUE(0);
 260 }
 261
 262 static void __exit acpi_fan_exit(void)
 263 {
 264         ACPI_FUNCTION_TRACE("acpi_fan_exit");
 265
 266         acpi_bus_unregister_driver(&acpi_fan_driver);
 267
 268         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 269
 270         return_VOID;
 271 }
 272
 273 module_init(acpi_fan_init);
 274 module_exit(acpi_fan_exit);