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