92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/*
|
|
* Eurobraille/Iris power off support.
|
|
*
|
|
* Eurobraille's Iris machine is a PC with no APM or ACPI support.
|
|
* It is shutdown by a special I/O sequence which this module provides.
|
|
*
|
|
* Copyright (C) Shérab <Sebastien.Hinderer@ens-lyon.org>
|
|
*
|
|
* 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 the program ; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/init.h>
|
|
#include <linux/pm.h>
|
|
#include <asm/io.h>
|
|
|
|
#define IRIS_GIO_BASE 0x340
|
|
#define IRIS_GIO_INPUT IRIS_GIO_BASE
|
|
#define IRIS_GIO_OUTPUT (IRIS_GIO_BASE + 1)
|
|
#define IRIS_GIO_PULSE 0x80 /* First byte to send */
|
|
#define IRIS_GIO_REST 0x00 /* Second byte to send */
|
|
#define IRIS_GIO_NODEV 0xff /* Likely not an Iris */
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Sébastien Hinderer <Sebastien.Hinderer@ens-lyon.org>");
|
|
MODULE_DESCRIPTION("A power_off handler for Iris devices from EuroBraille");
|
|
MODULE_SUPPORTED_DEVICE("Eurobraille/Iris");
|
|
|
|
static int force;
|
|
|
|
module_param(force, bool, 0);
|
|
MODULE_PARM_DESC(force, "Set to one to force poweroff handler installation.");
|
|
|
|
static void (*old_pm_power_off)(void);
|
|
|
|
static void iris_power_off(void)
|
|
{
|
|
outb(IRIS_GIO_PULSE, IRIS_GIO_OUTPUT);
|
|
msleep(850);
|
|
outb(IRIS_GIO_REST, IRIS_GIO_OUTPUT);
|
|
}
|
|
|
|
/*
|
|
* Before installing the power_off handler, try to make sure the OS is
|
|
* running on an Iris. Since Iris does not support DMI, this is done
|
|
* by reading its input port and seeing whether the read value is
|
|
* meaningful.
|
|
*/
|
|
static int iris_init(void)
|
|
{
|
|
unsigned char status;
|
|
if (force != 1) {
|
|
printk(KERN_ERR "The force parameter has not been set to 1 so the Iris poweroff handler will not be installed.\n");
|
|
return -ENODEV;
|
|
}
|
|
status = inb(IRIS_GIO_INPUT);
|
|
if (status == IRIS_GIO_NODEV) {
|
|
printk(KERN_ERR "This machine does not seem to be an Iris. Power_off handler not installed.\n");
|
|
return -ENODEV;
|
|
}
|
|
old_pm_power_off = pm_power_off;
|
|
pm_power_off = &iris_power_off;
|
|
printk(KERN_INFO "Iris power_off handler installed.\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void iris_exit(void)
|
|
{
|
|
pm_power_off = old_pm_power_off;
|
|
printk(KERN_INFO "Iris power_off handler uninstalled.\n");
|
|
}
|
|
|
|
module_init(iris_init);
|
|
module_exit(iris_exit);
|