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fan.c

/*
 *  acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>

#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define ACPI_FAN_COMPONENT          0x00200000
#define ACPI_FAN_CLASS              "fan"
#define ACPI_FAN_FILE_STATE         "state"

#define _COMPONENT            ACPI_FAN_COMPONENT
ACPI_MODULE_NAME("fan");

MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION("ACPI Fan Driver");
MODULE_LICENSE("GPL");

static int acpi_fan_add(struct acpi_device *device);
static int acpi_fan_remove(struct acpi_device *device, int type);
static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state);
static int acpi_fan_resume(struct acpi_device *device);

static const struct acpi_device_id fan_device_ids[] = {
      {"PNP0C0B", 0},
      {"", 0},
};
MODULE_DEVICE_TABLE(acpi, fan_device_ids);

static struct acpi_driver acpi_fan_driver = {
      .name = "fan",
      .class = ACPI_FAN_CLASS,
      .ids = fan_device_ids,
      .ops = {
            .add = acpi_fan_add,
            .remove = acpi_fan_remove,
            .suspend = acpi_fan_suspend,
            .resume = acpi_fan_resume,
            },
};

/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */

static struct proc_dir_entry *acpi_fan_dir;

static int acpi_fan_read_state(struct seq_file *seq, void *offset)
{
      struct acpi_device *device = seq->private;
      int state = 0;


      if (device) {
            if (acpi_bus_get_power(device->handle, &state))
                  seq_printf(seq, "status:                  ERROR\n");
            else
                  seq_printf(seq, "status:                  %s\n",
                           !state ? "on" : "off");
      }
      return 0;
}

static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
{
      return single_open(file, acpi_fan_read_state, PDE(inode)->data);
}

static ssize_t
acpi_fan_write_state(struct file *file, const char __user * buffer,
                 size_t count, loff_t * ppos)
{
      int result = 0;
      struct seq_file *m = file->private_data;
      struct acpi_device *device = m->private;
      char state_string[12] = { '\0' };

      if (count > sizeof(state_string) - 1)
            return -EINVAL;

      if (copy_from_user(state_string, buffer, count))
            return -EFAULT;

      state_string[count] = '\0';

      result = acpi_bus_set_power(device->handle,
                            simple_strtoul(state_string, NULL, 0));
      if (result)
            return result;

      return count;
}

static const struct file_operations acpi_fan_state_ops = {
      .open = acpi_fan_state_open_fs,
      .read = seq_read,
      .write = acpi_fan_write_state,
      .llseek = seq_lseek,
      .release = single_release,
      .owner = THIS_MODULE,
};

static int acpi_fan_add_fs(struct acpi_device *device)
{
      struct proc_dir_entry *entry = NULL;


      if (!device)
            return -EINVAL;

      if (!acpi_device_dir(device)) {
            acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
                                         acpi_fan_dir);
            if (!acpi_device_dir(device))
                  return -ENODEV;
            acpi_device_dir(device)->owner = THIS_MODULE;
      }

      /* 'status' [R/W] */
      entry = create_proc_entry(ACPI_FAN_FILE_STATE,
                          S_IFREG | S_IRUGO | S_IWUSR,
                          acpi_device_dir(device));
      if (!entry)
            return -ENODEV;
      else {
            entry->proc_fops = &acpi_fan_state_ops;
            entry->data = device;
            entry->owner = THIS_MODULE;
      }

      return 0;
}

static int acpi_fan_remove_fs(struct acpi_device *device)
{

      if (acpi_device_dir(device)) {
            remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
            remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
            acpi_device_dir(device) = NULL;
      }

      return 0;
}

/* --------------------------------------------------------------------------
                                 Driver Interface
   -------------------------------------------------------------------------- */

static int acpi_fan_add(struct acpi_device *device)
{
      int result = 0;
      struct acpi_fan *fan = NULL;
      int state = 0;


      if (!device)
            return -EINVAL;

      strcpy(acpi_device_name(device), "Fan");
      strcpy(acpi_device_class(device), ACPI_FAN_CLASS);

      result = acpi_bus_get_power(device->handle, &state);
      if (result) {
            printk(KERN_ERR PREFIX "Reading power state\n");
            goto end;
      }

      device->flags.force_power_state = 1;
      acpi_bus_set_power(device->handle, state);
      device->flags.force_power_state = 0;

      result = acpi_fan_add_fs(device);
      if (result)
            goto end;

      printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
             acpi_device_name(device), acpi_device_bid(device),
             !device->power.state ? "on" : "off");

      end:
      if (result)
            kfree(fan);

      return result;
}

static int acpi_fan_remove(struct acpi_device *device, int type)
{
      if (!device || !acpi_driver_data(device))
            return -EINVAL;

      acpi_fan_remove_fs(device);

      return 0;
}

static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
{
      if (!device)
            return -EINVAL;

      acpi_bus_set_power(device->handle, ACPI_STATE_D0);

      return AE_OK;
}

static int acpi_fan_resume(struct acpi_device *device)
{
      int result = 0;
      int power_state = 0;

      if (!device)
            return -EINVAL;

      result = acpi_bus_get_power(device->handle, &power_state);
      if (result) {
            ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
                          "Error reading fan power state\n"));
            return result;
      }

      device->flags.force_power_state = 1;
      acpi_bus_set_power(device->handle, power_state);
      device->flags.force_power_state = 0;

      return result;
}

static int __init acpi_fan_init(void)
{
      int result = 0;


      acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
      if (!acpi_fan_dir)
            return -ENODEV;
      acpi_fan_dir->owner = THIS_MODULE;

      result = acpi_bus_register_driver(&acpi_fan_driver);
      if (result < 0) {
            remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
            return -ENODEV;
      }

      return 0;
}

static void __exit acpi_fan_exit(void)
{

      acpi_bus_unregister_driver(&acpi_fan_driver);

      remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);

      return;
}

module_init(acpi_fan_init);
module_exit(acpi_fan_exit);

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