167 lines
4.1 KiB
C
167 lines
4.1 KiB
C
/*
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* $Id: power.c,v 1.10 2001/09/25 09:17:15 vojtech Exp $
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*
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* Copyright (c) 2001 "Crazy" James Simmons
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*
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* Input driver Power Management.
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*
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* Sponsored by Transvirtual Technology.
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Should you need to contact me, the author, you can do so by
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* e-mail - mail your message to <jsimmons@transvirtual.com>.
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*/
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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/tty.h>
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#include <linux/delay.h>
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#include <linux/pm.h>
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static struct input_handler power_handler;
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/*
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* Power management can't be done in a interrupt context. So we have to
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* use keventd.
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*/
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static int suspend_button_pushed = 0;
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static void suspend_button_task_handler(void *data)
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{
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udelay(200); /* debounce */
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suspend_button_pushed = 0;
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}
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static DECLARE_WORK(suspend_button_task, suspend_button_task_handler, NULL);
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static void power_event(struct input_handle *handle, unsigned int type,
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unsigned int code, int down)
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{
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struct input_dev *dev = handle->dev;
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printk("Entering power_event\n");
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if (type == EV_PWR) {
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switch (code) {
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case KEY_SUSPEND:
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printk("Powering down entire device\n");
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if (!suspend_button_pushed) {
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suspend_button_pushed = 1;
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schedule_work(&suspend_button_task);
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}
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break;
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case KEY_POWER:
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/* Hum power down the machine. */
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break;
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default:
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return;
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}
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}
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if (type == EV_KEY) {
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switch (code) {
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case KEY_SUSPEND:
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printk("Powering down input device\n");
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/* This is risky. See pm.h for details. */
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if (dev->state != PM_RESUME)
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dev->state = PM_RESUME;
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else
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dev->state = PM_SUSPEND;
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pm_send(dev->pm_dev, dev->state, dev);
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break;
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case KEY_POWER:
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/* Turn the input device off completely ? */
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break;
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default:
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return;
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}
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}
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return;
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}
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static struct input_handle *power_connect(struct input_handler *handler,
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struct input_dev *dev,
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const struct input_device_id *id)
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{
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struct input_handle *handle;
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if (!(handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL)))
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return NULL;
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handle->dev = dev;
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handle->handler = handler;
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input_open_device(handle);
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printk(KERN_INFO "power.c: Adding power management to input layer\n");
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return handle;
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}
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static void power_disconnect(struct input_handle *handle)
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{
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input_close_device(handle);
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kfree(handle);
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}
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static const struct input_device_id power_ids[] = {
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
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.evbit = { BIT(EV_KEY) },
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.keybit = { [LONG(KEY_SUSPEND)] = BIT(KEY_SUSPEND) }
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},
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
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.evbit = { BIT(EV_KEY) },
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.keybit = { [LONG(KEY_POWER)] = BIT(KEY_POWER) }
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},
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
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.evbit = { BIT(EV_PWR) },
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},
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{ }, /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(input, power_ids);
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static struct input_handler power_handler = {
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.event = power_event,
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.connect = power_connect,
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.disconnect = power_disconnect,
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.name = "power",
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.id_table = power_ids,
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};
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static int __init power_init(void)
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{
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return input_register_handler(&power_handler);
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}
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static void __exit power_exit(void)
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{
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input_unregister_handler(&power_handler);
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}
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module_init(power_init);
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module_exit(power_exit);
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MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
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MODULE_DESCRIPTION("Input Power Management driver");
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MODULE_LICENSE("GPL");
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