fan.c 9.03 KB
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/*
 *  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>
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#include <linux/thermal.h>
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#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define ACPI_FAN_CLASS			"fan"
#define ACPI_FAN_FILE_STATE		"state"

#define _COMPONENT		ACPI_FAN_COMPONENT
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ACPI_MODULE_NAME("fan");
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MODULE_AUTHOR("Paul Diefenbaugh");
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MODULE_DESCRIPTION("ACPI Fan Driver");
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MODULE_LICENSE("GPL");

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static int acpi_fan_add(struct acpi_device *device);
static int acpi_fan_remove(struct acpi_device *device, int type);
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static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state);
static int acpi_fan_resume(struct acpi_device *device);
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static const struct acpi_device_id fan_device_ids[] = {
	{"PNP0C0B", 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, fan_device_ids);

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

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/* thermal cooling device callbacks */
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static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
			     *state)
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{
	/* ACPI fan device only support two states: ON/OFF */
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	*state = 1;
	return 0;
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}

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static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
			     *state)
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{
	struct acpi_device *device = cdev->devdata;
	int result;
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	int acpi_state;
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	if (!device)
		return -EINVAL;

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	result = acpi_bus_get_power(device->handle, &acpi_state);
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	if (result)
		return result;

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	*state = (acpi_state == ACPI_STATE_D3 ? 0 :
		 (acpi_state == ACPI_STATE_D0 ? 1 : -1));
	return 0;
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}

static int
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fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
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{
	struct acpi_device *device = cdev->devdata;
	int result;

	if (!device || (state != 0 && state != 1))
		return -EINVAL;

	result = acpi_bus_set_power(device->handle,
				state ? ACPI_STATE_D0 : ACPI_STATE_D3);

	return result;
}

static struct thermal_cooling_device_ops fan_cooling_ops = {
	.get_max_state = fan_get_max_state,
	.get_cur_state = fan_get_cur_state,
	.set_cur_state = fan_set_cur_state,
};

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/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */
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#ifdef CONFIG_ACPI_PROCFS
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static struct proc_dir_entry *acpi_fan_dir;
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static int acpi_fan_read_state(struct seq_file *seq, void *offset)
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{
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	struct acpi_device *device = seq->private;
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	int state = 0;
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	if (device) {
		if (acpi_bus_get_power(device->handle, &state))
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			seq_printf(seq, "status:                  ERROR\n");
		else
			seq_printf(seq, "status:                  %s\n",
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				   !state ? "on" : "off");
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	}
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	return 0;
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}

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
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acpi_fan_write_state(struct file *file, const char __user * buffer,
		     size_t count, loff_t * ppos)
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{
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	int result = 0;
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	struct seq_file *m = file->private_data;
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	struct acpi_device *device = m->private;
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	char state_string[3] = { '\0' };
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	if (count > sizeof(state_string) - 1)
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		return -EINVAL;
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	if (copy_from_user(state_string, buffer, count))
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		return -EFAULT;
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	state_string[count] = '\0';
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	if ((state_string[0] < '0') || (state_string[0] > '3'))
		return -EINVAL;
	if (state_string[1] == '\n')
		state_string[1] = '\0';
	if (state_string[1] != '\0')
		return -EINVAL;
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	result = acpi_bus_set_power(device->handle,
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				    simple_strtoul(state_string, NULL, 0));
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	if (result)
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		return result;
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	return count;
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}

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

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static int acpi_fan_add_fs(struct acpi_device *device)
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{
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	struct proc_dir_entry *entry = NULL;
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	if (!device)
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		return -EINVAL;
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	if (!acpi_device_dir(device)) {
		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
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						     acpi_fan_dir);
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		if (!acpi_device_dir(device))
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			return -ENODEV;
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		acpi_device_dir(device)->owner = THIS_MODULE;
	}

	/* 'status' [R/W] */
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	entry = proc_create_data(ACPI_FAN_FILE_STATE,
				 S_IFREG | S_IRUGO | S_IWUSR,
				 acpi_device_dir(device),
				 &acpi_fan_state_ops,
				 device);
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	if (!entry)
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		return -ENODEV;
	return 0;
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}

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static int acpi_fan_remove_fs(struct acpi_device *device)
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{

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

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	return 0;
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}
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#else
static int acpi_fan_add_fs(struct acpi_device *device)
{
	return 0;
}
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static int acpi_fan_remove_fs(struct acpi_device *device)
{
	return 0;
}
#endif
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/* --------------------------------------------------------------------------
                                 Driver Interface
   -------------------------------------------------------------------------- */

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static int acpi_fan_add(struct acpi_device *device)
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{
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	int result = 0;
	int state = 0;
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	struct thermal_cooling_device *cdev;
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	if (!device)
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		return -EINVAL;
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	strcpy(acpi_device_name(device), "Fan");
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	strcpy(acpi_device_class(device), ACPI_FAN_CLASS);

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

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

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	cdev = thermal_cooling_device_register("Fan", device,
						&fan_cooling_ops);
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	if (IS_ERR(cdev)) {
		result = PTR_ERR(cdev);
		goto end;
	}
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	dev_info(&device->dev, "registered as cooling_device%d\n", cdev->id);
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	device->driver_data = cdev;
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	result = sysfs_create_link(&device->dev.kobj,
				   &cdev->device.kobj,
				   "thermal_cooling");
	if (result)
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		dev_err(&device->dev, "Failed to create sysfs link "
			"'thermal_cooling'\n");
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	result = sysfs_create_link(&cdev->device.kobj,
				   &device->dev.kobj,
				   "device");
	if (result)
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		dev_err(&device->dev, "Failed to create sysfs link "
			"'device'\n");
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	result = acpi_fan_add_fs(device);
	if (result)
		goto end;

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

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static int acpi_fan_remove(struct acpi_device *device, int type)
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{
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	struct thermal_cooling_device *cdev = acpi_driver_data(device);

	if (!device || !cdev)
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		return -EINVAL;
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	acpi_fan_remove_fs(device);
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	sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
	sysfs_remove_link(&cdev->device.kobj, "device");
	thermal_cooling_device_unregister(cdev);
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	return 0;
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}

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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) {
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		printk(KERN_ERR PREFIX
				  "Error reading fan power state\n");
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		return result;
	}

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

	return result;
}

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static int __init acpi_fan_init(void)
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{
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	int result = 0;
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#ifdef CONFIG_ACPI_PROCFS
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	acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
	if (!acpi_fan_dir)
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		return -ENODEV;
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	acpi_fan_dir->owner = THIS_MODULE;
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#endif
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	result = acpi_bus_register_driver(&acpi_fan_driver);
	if (result < 0) {
		remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
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		return -ENODEV;
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	}

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	return 0;
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}

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static void __exit acpi_fan_exit(void)
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{

	acpi_bus_unregister_driver(&acpi_fan_driver);

	remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);

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	return;
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}

module_init(acpi_fan_init);
module_exit(acpi_fan_exit);