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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         acpi_handle handle;
  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         ACPI_FUNCTION_TRACE("acpi_fan_read_state");
  82
  83         if (fan) {
  84                 if (acpi_bus_get_power(fan->handle, &state))
  85                         seq_printf(seq, "status:                  ERROR\n");
  86                 else
  87                         seq_printf(seq, "status:                  %s\n",
  88                                    !state ? "on" : "off");
  89         }
  90         return_VALUE(0);
  91 }
  92
  93 static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
  94 {
  95         return single_open(file, acpi_fan_read_state, PDE(inode)->data);
  96 }
  97
  98 static ssize_t
  99 acpi_fan_write_state(struct file *file, const char __user * buffer,
 100                      size_t count, loff_t * ppos)
 101 {
 102         int result = 0;
 103         struct seq_file *m = (struct seq_file *)file->private_data;
 104         struct acpi_fan *fan = (struct acpi_fan *)m->private;
 105         char state_string[12] = { '\0' };
 106
 107         ACPI_FUNCTION_TRACE("acpi_fan_write_state");
 108
 109         if (!fan || (count > sizeof(state_string) - 1))
 110                 return_VALUE(-EINVAL);
 111
 112         if (copy_from_user(state_string, buffer, count))
 113                 return_VALUE(-EFAULT);
 114
 115         state_string[count] = '\0';
 116
 117         result = acpi_bus_set_power(fan->handle,
 118                                     simple_strtoul(state_string, NULL, 0));
 119         if (result)
 120                 return_VALUE(result);
 121
 122         return_VALUE(count);
 123 }
 124
 125 static struct file_operations acpi_fan_state_ops = {
 126         .open = acpi_fan_state_open_fs,
 127         .read = seq_read,
 128         .write = acpi_fan_write_state,
 129         .llseek = seq_lseek,
 130         .release = single_release,
 131         .owner = THIS_MODULE,
 132 };
 133
 134 static int acpi_fan_add_fs(struct acpi_device *device)
 135 {
 136         struct proc_dir_entry *entry = NULL;
 137
 138         ACPI_FUNCTION_TRACE("acpi_fan_add_fs");
 139
 140         if (!device)
 141                 return_VALUE(-EINVAL);
 142
 143         if (!acpi_device_dir(device)) {
 144                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 145                                                      acpi_fan_dir);
 146                 if (!acpi_device_dir(device))
 147                         return_VALUE(-ENODEV);
 148                 acpi_device_dir(device)->owner = THIS_MODULE;
 149         }
 150
 151         /* 'status' [R/W] */
 152         entry = create_proc_entry(ACPI_FAN_FILE_STATE,
 153                                   S_IFREG | S_IRUGO | S_IWUSR,
 154                                   acpi_device_dir(device));
 155         if (!entry)
 156                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 157                                   "Unable to create '%s' fs entry\n",
 158                                   ACPI_FAN_FILE_STATE));
 159         else {
 160                 entry->proc_fops = &acpi_fan_state_ops;
 161                 entry->data = acpi_driver_data(device);
 162                 entry->owner = THIS_MODULE;
 163         }
 164
 165         return_VALUE(0);
 166 }
 167
 168 static int acpi_fan_remove_fs(struct acpi_device *device)
 169 {
 170         ACPI_FUNCTION_TRACE("acpi_fan_remove_fs");
 171
 172         if (acpi_device_dir(device)) {
 173                 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
 174                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
 175                 acpi_device_dir(device) = NULL;
 176         }
 177
 178         return_VALUE(0);
 179 }
 180
 181 /* --------------------------------------------------------------------------
 182                                  Driver Interface
 183    -------------------------------------------------------------------------- */
 184
 185 static int acpi_fan_add(struct acpi_device *device)
 186 {
 187         int result = 0;
 188         struct acpi_fan *fan = NULL;
 189         int state = 0;
 190
 191         ACPI_FUNCTION_TRACE("acpi_fan_add");
 192
 193         if (!device)
 194                 return_VALUE(-EINVAL);
 195
 196         fan = kmalloc(sizeof(struct acpi_fan), GFP_KERNEL);
 197         if (!fan)
 198                 return_VALUE(-ENOMEM);
 199         memset(fan, 0, sizeof(struct acpi_fan));
 200
 201         fan->handle = device->handle;
 202         strcpy(acpi_device_name(device), "Fan");
 203         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
 204         acpi_driver_data(device) = fan;
 205
 206         result = acpi_bus_get_power(fan->handle, &state);
 207         if (result) {
 208                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 209                                   "Error reading power state\n"));
 210                 goto end;
 211         }
 212
 213         device->flags.force_power_state = 1;
 214         acpi_bus_set_power(device->handle, state);
 215         device->flags.force_power_state = 0;
 216
 217         result = acpi_fan_add_fs(device);
 218         if (result)
 219                 goto end;
 220
 221         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 222                acpi_device_name(device), acpi_device_bid(device),
 223                !device->power.state ? "on" : "off");
 224
 225       end:
 226         if (result)
 227                 kfree(fan);
 228
 229         return_VALUE(result);
 230 }
 231
 232 static int acpi_fan_remove(struct acpi_device *device, int type)
 233 {
 234         struct acpi_fan *fan = NULL;
 235
 236         ACPI_FUNCTION_TRACE("acpi_fan_remove");
 237
 238         if (!device || !acpi_driver_data(device))
 239                 return_VALUE(-EINVAL);
 240
 241         fan = (struct acpi_fan *)acpi_driver_data(device);
 242
 243         acpi_fan_remove_fs(device);
 244
 245         kfree(fan);
 246
 247         return_VALUE(0);
 248 }
 249
 250 static int acpi_fan_suspend(struct acpi_device *device, int state)
 251 {
 252         if (!device)
 253                 return -EINVAL;
 254
 255         acpi_bus_set_power(device->handle, ACPI_STATE_D0);
 256
 257         return AE_OK;
 258 }
 259
 260 static int acpi_fan_resume(struct acpi_device *device, int state)
 261 {
 262         int result = 0;
 263         int power_state = 0;
 264
 265         if (!device)
 266                 return -EINVAL;
 267
 268         result = acpi_bus_get_power(device->handle, &power_state);
 269         if (result) {
 270                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 271                                   "Error reading fan power state\n"));
 272                 return result;
 273         }
 274
 275         device->flags.force_power_state = 1;
 276         acpi_bus_set_power(device->handle, power_state);
 277         device->flags.force_power_state = 0;
 278
 279         return result;
 280 }
 281
 282 static int __init acpi_fan_init(void)
 283 {
 284         int result = 0;
 285
 286         ACPI_FUNCTION_TRACE("acpi_fan_init");
 287
 288         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
 289         if (!acpi_fan_dir)
 290                 return_VALUE(-ENODEV);
 291         acpi_fan_dir->owner = THIS_MODULE;
 292
 293         result = acpi_bus_register_driver(&acpi_fan_driver);
 294         if (result < 0) {
 295                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 296                 return_VALUE(-ENODEV);
 297         }
 298
 299         return_VALUE(0);
 300 }
 301
 302 static void __exit acpi_fan_exit(void)
 303 {
 304         ACPI_FUNCTION_TRACE("acpi_fan_exit");
 305
 306         acpi_bus_unregister_driver(&acpi_fan_driver);
 307
 308         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 309
 310         return_VOID;
 311 }
 312
 313 module_init(acpi_fan_init);
 314 module_exit(acpi_fan_exit);