/*
* $Id: power.c,v 1.10 2001/09/25 09:17:15 vojtech Exp $
*
* Copyright (c) 2001 "Crazy" James Simmons
*
* Input driver Power Management.
*
* Sponsored by Transvirtual Technology.
*/
/*
* 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
*
* Should you need to contact me, the author, you can do so by
* e-mail - mail your message to <jsimmons@transvirtual.com>.
*/
#include <linux/module.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/tty.h>
#include <linux/delay.h>
#include <linux/pm.h>
static struct input_handler power_handler;
/*
* Power management can't be done in a interrupt context. So we have to
* use keventd.
*/
static int suspend_button_pushed = 0;
static void suspend_button_task_handler(void *data)
{
udelay(200); /* debounce */
suspend_button_pushed = 0;
}
static DECLARE_WORK(suspend_button_task, suspend_button_task_handler, NULL);
static void power_event(struct input_handle *handle, unsigned int type,
unsigned int code, int down)
{
struct input_dev *dev = handle->dev;
printk("Entering power_event\n");
if (type == EV_PWR) {
switch (code) {
case KEY_SUSPEND:
printk("Powering down entire device\n");
if (!suspend_button_pushed) {
suspend_button_pushed = 1;
schedule_work(&suspend_button_task);
}
break;
case KEY_POWER:
/* Hum power down the machine. */
break;
default:
return;
}
}
if (type == EV_KEY) {
switch (code) {
case KEY_SUSPEND:
printk("Powering down input device\n");
/* This is risky. See pm.h for details. */
if (dev->state != PM_RESUME)
dev->state = PM_RESUME;
else
dev->state = PM_SUSPEND;
pm_send(dev->pm_dev, dev->state, dev);
break;
case KEY_POWER:
/* Turn the input device off completely ? */
break;
default:
return;
}
}
return;
}
static struct input_handle *power_connect(struct input_handler *handler,
struct input_dev *dev,
const struct input_device_id *id)
{
struct input_handle *handle;
if (!(handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL)))
return NULL;
handle->dev = dev;
handle->handler = handler;
input_open_device(handle);
printk(KERN_INFO "power.c: Adding power management to input layer\n");
return handle;
}
static void power_disconnect(struct input_handle *handle)
{
input_close_device(handle);
kfree(handle);
}
static const struct input_device_id power_ids[] = {
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
.evbit = { BIT(EV_KEY) },
.keybit = { [LONG(KEY_SUSPEND)] = BIT(KEY_SUSPEND) }
},
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
.evbit = { BIT(EV_KEY) },
.keybit = { [LONG(KEY_POWER)] = BIT(KEY_POWER) }
},
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
.evbit = { BIT(EV_PWR) },
},
{ }, /* Terminating entry */
};
MODULE_DEVICE_TABLE(input, power_ids);
static struct input_handler power_handler = {
.event = power_event,
.connect = power_connect,
.disconnect = power_disconnect,
.name = "power",
.id_table = power_ids,
};
static int __init power_init(void)
{
input_register_handler(&power_handler);
return 0;
}
static void __exit power_exit(void)
{
input_unregister_handler(&power_handler);
}
module_init(power_init);
module_exit(power_exit);
MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
MODULE_DESCRIPTION("Input Power Management driver");
MODULE_LICENSE("GPL");
