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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 const struct acpi_device_id fan_device_ids[] = {
  54         {"PNP0C0B", 0},
  55         {"", 0},
  56 };
  57 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
  58
  59 static struct acpi_driver acpi_fan_driver = {
  60         .name = "fan",
  61         .class = ACPI_FAN_CLASS,
  62         .ids = fan_device_ids,
  63         .ops = {
  64                 .add = acpi_fan_add,
  65                 .remove = acpi_fan_remove,
  66                 .suspend = acpi_fan_suspend,
  67                 .resume = acpi_fan_resume,
  68                 },
  69 };
  70
  71 struct acpi_fan {
  72         struct acpi_device * device;
  73 };
  74
  75 /* --------------------------------------------------------------------------
  76                               FS Interface (/proc)
  77    -------------------------------------------------------------------------- */
  78
  79 static struct proc_dir_entry *acpi_fan_dir;
  80
  81 static int acpi_fan_read_state(struct seq_file *seq, void *offset)
  82 {
  83         struct acpi_fan *fan = seq->private;
  84         int state = 0;
  85
  86
  87         if (fan) {
  88                 if (acpi_bus_get_power(fan->device->handle, &state))
  89                         seq_printf(seq, "status:                  ERROR\n");
  90                 else
  91                         seq_printf(seq, "status:                  %s\n",
  92                                    !state ? "on" : "off");
  93         }
  94         return 0;
  95 }
  96
  97 static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
  98 {
  99         return single_open(file, acpi_fan_read_state, PDE(inode)->data);
 100 }
 101
 102 static ssize_t
 103 acpi_fan_write_state(struct file *file, const char __user * buffer,
 104                      size_t count, loff_t * ppos)
 105 {
 106         int result = 0;
 107         struct seq_file *m = file->private_data;
 108         struct acpi_fan *fan = m->private;
 109         char state_string[12] = { '\0' };
 110
 111
 112         if (!fan || (count > sizeof(state_string) - 1))
 113                 return -EINVAL;
 114
 115         if (copy_from_user(state_string, buffer, count))
 116                 return -EFAULT;
 117
 118         state_string[count] = '\0';
 119
 120         result = acpi_bus_set_power(fan->device->handle,
 121                                     simple_strtoul(state_string, NULL, 0));
 122         if (result)
 123                 return result;
 124
 125         return count;
 126 }
 127
 128 static const struct file_operations acpi_fan_state_ops = {
 129         .open = acpi_fan_state_open_fs,
 130         .read = seq_read,
 131         .write = acpi_fan_write_state,
 132         .llseek = seq_lseek,
 133         .release = single_release,
 134         .owner = THIS_MODULE,
 135 };
 136
 137 static int acpi_fan_add_fs(struct acpi_device *device)
 138 {
 139         struct proc_dir_entry *entry = NULL;
 140
 141
 142         if (!device)
 143                 return -EINVAL;
 144
 145         if (!acpi_device_dir(device)) {
 146                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 147                                                      acpi_fan_dir);
 148                 if (!acpi_device_dir(device))
 149                         return -ENODEV;
 150                 acpi_device_dir(device)->owner = THIS_MODULE;
 151         }
 152
 153         /* 'status' [R/W] */
 154         entry = create_proc_entry(ACPI_FAN_FILE_STATE,
 155                                   S_IFREG | S_IRUGO | S_IWUSR,
 156                                   acpi_device_dir(device));
 157         if (!entry)
 158                 return -ENODEV;
 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 0;
 166 }
 167
 168 static int acpi_fan_remove_fs(struct acpi_device *device)
 169 {
 170
 171         if (acpi_device_dir(device)) {
 172                 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
 173                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
 174                 acpi_device_dir(device) = NULL;
 175         }
 176
 177         return 0;
 178 }
 179
 180 /* --------------------------------------------------------------------------
 181                                  Driver Interface
 182    -------------------------------------------------------------------------- */
 183
 184 static int acpi_fan_add(struct acpi_device *device)
 185 {
 186         int result = 0;
 187         struct acpi_fan *fan = NULL;
 188         int state = 0;
 189
 190
 191         if (!device)
 192                 return -EINVAL;
 193
 194         fan = kzalloc(sizeof(struct acpi_fan), GFP_KERNEL);
 195         if (!fan)
 196                 return -ENOMEM;
 197
 198         fan->device = device;
 199         strcpy(acpi_device_name(device), "Fan");
 200         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
 201         acpi_driver_data(device) = fan;
 202
 203         result = acpi_bus_get_power(device->handle, &state);
 204         if (result) {
 205                 printk(KERN_ERR PREFIX "Reading power state\n");
 206                 goto end;
 207         }
 208
 209         device->flags.force_power_state = 1;
 210         acpi_bus_set_power(device->handle, state);
 211         device->flags.force_power_state = 0;
 212
 213         result = acpi_fan_add_fs(device);
 214         if (result)
 215                 goto end;
 216
 217         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 218                acpi_device_name(device), acpi_device_bid(device),
 219                !device->power.state ? "on" : "off");
 220
 221       end:
 222         if (result)
 223                 kfree(fan);
 224
 225         return result;
 226 }
 227
 228 static int acpi_fan_remove(struct acpi_device *device, int type)
 229 {
 230         struct acpi_fan *fan = NULL;
 231
 232
 233         if (!device || !acpi_driver_data(device))
 234                 return -EINVAL;
 235
 236         fan = acpi_driver_data(device);
 237
 238         acpi_fan_remove_fs(device);
 239
 240         kfree(fan);
 241
 242         return 0;
 243 }
 244
 245 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
 246 {
 247         if (!device)
 248                 return -EINVAL;
 249
 250         acpi_bus_set_power(device->handle, ACPI_STATE_D0);
 251
 252         return AE_OK;
 253 }
 254
 255 static int acpi_fan_resume(struct acpi_device *device)
 256 {
 257         int result = 0;
 258         int power_state = 0;
 259
 260         if (!device)
 261                 return -EINVAL;
 262
 263         result = acpi_bus_get_power(device->handle, &power_state);
 264         if (result) {
 265                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 266                                   "Error reading fan power state\n"));
 267                 return result;
 268         }
 269
 270         device->flags.force_power_state = 1;
 271         acpi_bus_set_power(device->handle, power_state);
 272         device->flags.force_power_state = 0;
 273
 274         return result;
 275 }
 276
 277 static int __init acpi_fan_init(void)
 278 {
 279         int result = 0;
 280
 281
 282         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
 283         if (!acpi_fan_dir)
 284                 return -ENODEV;
 285         acpi_fan_dir->owner = THIS_MODULE;
 286
 287         result = acpi_bus_register_driver(&acpi_fan_driver);
 288         if (result < 0) {
 289                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 290                 return -ENODEV;
 291         }
 292
 293         return 0;
 294 }
 295
 296 static void __exit acpi_fan_exit(void)
 297 {
 298
 299         acpi_bus_unregister_driver(&acpi_fan_driver);
 300
 301         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 302
 303         return;
 304 }
 305
 306 module_init(acpi_fan_init);
 307 module_exit(acpi_fan_exit);