/drivers/input/power.c
https://bitbucket.org/abioy/linux · C · 174 lines · 115 code · 25 blank · 34 comment · 18 complexity · 197f75aadc4c82ef2ac3e173e0283b5c MD5 · raw file
- /*
- * $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/config.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_KEY || type != EV_PWR) return;
- 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;
- }
- } else {
- 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,
- struct input_device_id *id)
- {
- struct input_handle *handle;
- if (!test_bit(EV_KEY, dev->evbit) || !test_bit(EV_PWR, dev->evbit))
- return NULL;
- if (!test_bit(KEY_SUSPEND, dev->keybit) || (!test_bit(KEY_POWER, dev->keybit)))
- return NULL;
- if (!(handle = kmalloc(sizeof(struct input_handle), GFP_KERNEL)))
- return NULL;
- memset(handle, 0, sizeof(struct input_handle));
- 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 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");