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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 #include <linux/thermal.h>
  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 /* thermal cooling device callbacks */
  72 static int fan_get_max_state(struct thermal_cooling_device *cdev, char *buf)
  73 {
  74         /* ACPI fan device only support two states: ON/OFF */
  75         return sprintf(buf, "1\n");
  76 }
  77
  78 static int fan_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
  79 {
  80         struct acpi_device *device = cdev->devdata;
  81         int state;
  82         int result;
  83
  84         if (!device)
  85                 return -EINVAL;
  86
  87         result = acpi_bus_get_power(device->handle, &state);
  88         if (result)
  89                 return result;
  90
  91         return sprintf(buf, "%s\n", state == ACPI_STATE_D3 ? "0" :
  92                          (state == ACPI_STATE_D0 ? "1" : "unknown"));
  93 }
  94
  95 static int
  96 fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
  97 {
  98         struct acpi_device *device = cdev->devdata;
  99         int result;
 100
 101         if (!device || (state != 0 && state != 1))
 102                 return -EINVAL;
 103
 104         result = acpi_bus_set_power(device->handle,
 105                                 state ? ACPI_STATE_D0 : ACPI_STATE_D3);
 106
 107         return result;
 108 }
 109
 110 static struct thermal_cooling_device_ops fan_cooling_ops = {
 111         .get_max_state = fan_get_max_state,
 112         .get_cur_state = fan_get_cur_state,
 113         .set_cur_state = fan_set_cur_state,
 114 };
 115
 116 /* --------------------------------------------------------------------------
 117                               FS Interface (/proc)
 118    -------------------------------------------------------------------------- */
 119 #ifdef CONFIG_ACPI_PROCFS
 120
 121 static struct proc_dir_entry *acpi_fan_dir;
 122
 123 static int acpi_fan_read_state(struct seq_file *seq, void *offset)
 124 {
 125         struct acpi_device *device = seq->private;
 126         int state = 0;
 127
 128
 129         if (device) {
 130                 if (acpi_bus_get_power(device->handle, &state))
 131                         seq_printf(seq, "status:                  ERROR\n");
 132                 else
 133                         seq_printf(seq, "status:                  %s\n",
 134                                    !state ? "on" : "off");
 135         }
 136         return 0;
 137 }
 138
 139 static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
 140 {
 141         return single_open(file, acpi_fan_read_state, PDE(inode)->data);
 142 }
 143
 144 static ssize_t
 145 acpi_fan_write_state(struct file *file, const char __user * buffer,
 146                      size_t count, loff_t * ppos)
 147 {
 148         int result = 0;
 149         struct seq_file *m = file->private_data;
 150         struct acpi_device *device = m->private;
 151         char state_string[12] = { '\0' };
 152
 153         if (count > sizeof(state_string) - 1)
 154                 return -EINVAL;
 155
 156         if (copy_from_user(state_string, buffer, count))
 157                 return -EFAULT;
 158
 159         state_string[count] = '\0';
 160
 161         result = acpi_bus_set_power(device->handle,
 162                                     simple_strtoul(state_string, NULL, 0));
 163         if (result)
 164                 return result;
 165
 166         return count;
 167 }
 168
 169 static const struct file_operations acpi_fan_state_ops = {
 170         .open = acpi_fan_state_open_fs,
 171         .read = seq_read,
 172         .write = acpi_fan_write_state,
 173         .llseek = seq_lseek,
 174         .release = single_release,
 175         .owner = THIS_MODULE,
 176 };
 177
 178 static int acpi_fan_add_fs(struct acpi_device *device)
 179 {
 180         struct proc_dir_entry *entry = NULL;
 181
 182
 183         if (!device)
 184                 return -EINVAL;
 185
 186         if (!acpi_device_dir(device)) {
 187                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 188                                                      acpi_fan_dir);
 189                 if (!acpi_device_dir(device))
 190                         return -ENODEV;
 191                 acpi_device_dir(device)->owner = THIS_MODULE;
 192         }
 193
 194         /* 'status' [R/W] */
 195         entry = create_proc_entry(ACPI_FAN_FILE_STATE,
 196                                   S_IFREG | S_IRUGO | S_IWUSR,
 197                                   acpi_device_dir(device));
 198         if (!entry)
 199                 return -ENODEV;
 200         else {
 201                 entry->proc_fops = &acpi_fan_state_ops;
 202                 entry->data = device;
 203                 entry->owner = THIS_MODULE;
 204         }
 205
 206         return 0;
 207 }
 208
 209 static int acpi_fan_remove_fs(struct acpi_device *device)
 210 {
 211
 212         if (acpi_device_dir(device)) {
 213                 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
 214                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
 215                 acpi_device_dir(device) = NULL;
 216         }
 217
 218         return 0;
 219 }
 220 #else
 221 static int acpi_fan_add_fs(struct acpi_device *device)
 222 {
 223         return 0;
 224 }
 225
 226 static int acpi_fan_remove_fs(struct acpi_device *device)
 227 {
 228         return 0;
 229 }
 230 #endif
 231 /* --------------------------------------------------------------------------
 232                                  Driver Interface
 233    -------------------------------------------------------------------------- */
 234
 235 static int acpi_fan_add(struct acpi_device *device)
 236 {
 237         int result = 0;
 238         int state = 0;
 239         struct thermal_cooling_device *cdev;
 240
 241         if (!device)
 242                 return -EINVAL;
 243
 244         strcpy(acpi_device_name(device), "Fan");
 245         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
 246
 247         result = acpi_bus_get_power(device->handle, &state);
 248         if (result) {
 249                 printk(KERN_ERR PREFIX "Reading power state\n");
 250                 goto end;
 251         }
 252
 253         device->flags.force_power_state = 1;
 254         acpi_bus_set_power(device->handle, state);
 255         device->flags.force_power_state = 0;
 256
 257         cdev = thermal_cooling_device_register("Fan", device,
 258                                                 &fan_cooling_ops);
 259         if (IS_ERR(cdev)) {
 260                 result = PTR_ERR(cdev);
 261                 goto end;
 262         }
 263         if (cdev) {
 264                 printk(KERN_INFO PREFIX
 265                         "%s is registered as cooling_device%d\n",
 266                         device->dev.bus_id, cdev->id);
 267
 268                 acpi_driver_data(device) = cdev;
 269                 result = sysfs_create_link(&device->dev.kobj,
 270                                            &cdev->device.kobj,
 271                                            "thermal_cooling");
 272                 if (result)
 273                         return result;
 274
 275                 result = sysfs_create_link(&cdev->device.kobj,
 276                                            &device->dev.kobj,
 277                                            "device");
 278                 if (result)
 279                         return result;
 280         }
 281
 282         result = acpi_fan_add_fs(device);
 283         if (result)
 284                 goto end;
 285
 286         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 287                acpi_device_name(device), acpi_device_bid(device),
 288                !device->power.state ? "on" : "off");
 289
 290       end:
 291         return result;
 292 }
 293
 294 static int acpi_fan_remove(struct acpi_device *device, int type)
 295 {
 296         struct thermal_cooling_device *cdev = acpi_driver_data(device);
 297
 298         if (!device || !cdev)
 299                 return -EINVAL;
 300
 301         acpi_fan_remove_fs(device);
 302         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 303         sysfs_remove_link(&cdev->device.kobj, "device");
 304         thermal_cooling_device_unregister(cdev);
 305
 306         return 0;
 307 }
 308
 309 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
 310 {
 311         if (!device)
 312                 return -EINVAL;
 313
 314         acpi_bus_set_power(device->handle, ACPI_STATE_D0);
 315
 316         return AE_OK;
 317 }
 318
 319 static int acpi_fan_resume(struct acpi_device *device)
 320 {
 321         int result = 0;
 322         int power_state = 0;
 323
 324         if (!device)
 325                 return -EINVAL;
 326
 327         result = acpi_bus_get_power(device->handle, &power_state);
 328         if (result) {
 329                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 330                                   "Error reading fan power state\n"));
 331                 return result;
 332         }
 333
 334         device->flags.force_power_state = 1;
 335         acpi_bus_set_power(device->handle, power_state);
 336         device->flags.force_power_state = 0;
 337
 338         return result;
 339 }
 340
 341 static int __init acpi_fan_init(void)
 342 {
 343         int result = 0;
 344
 345
 346 #ifdef CONFIG_ACPI_PROCFS
 347         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
 348         if (!acpi_fan_dir)
 349                 return -ENODEV;
 350         acpi_fan_dir->owner = THIS_MODULE;
 351 #endif
 352
 353         result = acpi_bus_register_driver(&acpi_fan_driver);
 354         if (result < 0) {
 355                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 356                 return -ENODEV;
 357         }
 358
 359         return 0;
 360 }
 361
 362 static void __exit acpi_fan_exit(void)
 363 {
 364
 365         acpi_bus_unregister_driver(&acpi_fan_driver);
 366
 367         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 368
 369         return;
 370 }
 371
 372 module_init(acpi_fan_init);
 373 module_exit(acpi_fan_exit);