/*
* 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_HID "PNP0C0B"
#define ACPI_FAN_DRIVER_NAME "ACPI Fan Driver"
#define ACPI_FAN_DEVICE_NAME "Fan"
#define ACPI_FAN_FILE_STATE "state"
#define ACPI_FAN_NOTIFY_STATUS 0x80
#define _COMPONENT ACPI_FAN_COMPONENT
ACPI_MODULE_NAME ("acpi_fan")
MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION(ACPI_FAN_DRIVER_NAME);
MODULE_LICENSE("GPL");
static int acpi_fan_add (struct acpi_device *device);
static int acpi_fan_remove (struct acpi_device *device, int type);
static struct acpi_driver acpi_fan_driver = {
.name = ACPI_FAN_DRIVER_NAME,
.class = ACPI_FAN_CLASS,
.ids = ACPI_FAN_HID,
.ops = {
.add = acpi_fan_add,
.remove = acpi_fan_remove,
},
};
struct acpi_fan {
acpi_handle handle;
};
/* --------------------------------------------------------------------------
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_fan *fan = seq->private;
int state = 0;
ACPI_FUNCTION_TRACE("acpi_fan_read_state");
if (fan) {
if (acpi_bus_get_power(fan->handle, &state))
seq_printf(seq, "status: ERROR\n");
else
seq_printf(seq, "status: %s\n",
!state?"on":"off");
}
return_VALUE(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 = (struct seq_file *)file->private_data;
struct acpi_fan *fan = (struct acpi_fan *) m->private;
char state_string[12] = {'\0'};
ACPI_FUNCTION_TRACE("acpi_fan_write_state");
if (!fan || (count > sizeof(state_string) - 1))
return_VALUE(-EINVAL);
if (copy_from_user(state_string, buffer, count))
return_VALUE(-EFAULT);
state_string[count] = '\0';
result = acpi_bus_set_power(fan->handle,
simple_strtoul(state_string, NULL, 0));
if (result)
return_VALUE(result);
return_VALUE(count);
}
static 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;
ACPI_FUNCTION_TRACE("acpi_fan_add_fs");
if (!device)
return_VALUE(-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_VALUE(-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)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to create '%s' fs entry\n",
ACPI_FAN_FILE_STATE));
else {
entry->proc_fops = &acpi_fan_state_ops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
return_VALUE(0);
}
static int
acpi_fan_remove_fs (
struct acpi_device *device)
{
ACPI_FUNCTION_TRACE("acpi_fan_remove_fs");
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_VALUE(0);
}
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
static int
acpi_fan_add (
struct acpi_device *device)
{
int result = 0;
struct acpi_fan *fan = NULL;
int state = 0;
ACPI_FUNCTION_TRACE("acpi_fan_add");
if (!device)
return_VALUE(-EINVAL);
fan = kmalloc(sizeof(struct acpi_fan), GFP_KERNEL);
if (!fan)
return_VALUE(-ENOMEM);
memset(fan, 0, sizeof(struct acpi_fan));
fan->handle = device->handle;
strcpy(acpi_device_name(device), ACPI_FAN_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
acpi_driver_data(device) = fan;
result = acpi_bus_get_power(fan->handle, &state);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error reading power state\n"));
goto end;
}
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_VALUE(result);
}
static int
acpi_fan_remove (
struct acpi_device *device,
int type)
{
struct acpi_fan *fan = NULL;
ACPI_FUNCTION_TRACE("acpi_fan_remove");
if (!device || !acpi_driver_data(device))
return_VALUE(-EINVAL);
fan = (struct acpi_fan *) acpi_driver_data(device);
acpi_fan_remove_fs(device);
kfree(fan);
return_VALUE(0);
}
static int __init
acpi_fan_init (void)
{
int result = 0;
ACPI_FUNCTION_TRACE("acpi_fan_init");
acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
if (!acpi_fan_dir)
return_VALUE(-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_VALUE(-ENODEV);
}
return_VALUE(0);
}
static void __exit
acpi_fan_exit (void)
{
ACPI_FUNCTION_TRACE("acpi_fan_exit");
acpi_bus_unregister_driver(&acpi_fan_driver);
remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
return_VOID;
}
module_init(acpi_fan_init);
module_exit(acpi_fan_exit);
