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linux
1/*
2 * $Id: power.c,v 1.10 2001/09/25 09:17:15 vojtech Exp $
3 *
4 * Copyright (c) 2001 "Crazy" James Simmons
5 *
6 * Input driver Power Management.
7 *
8 * Sponsored by Transvirtual Technology.
9 */
10
11/*
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 * Should you need to contact me, the author, you can do so by
27 * e-mail - mail your message to <jsimmons@transvirtual.com>.
28 */
29
30#include <linux/module.h>
31#include <linux/config.h>
32#include <linux/input.h>
33#include <linux/slab.h>
34#include <linux/init.h>
35#include <linux/tty.h>
36#include <linux/delay.h>
37#include <linux/pm.h>
38
39static struct input_handler power_handler;
40
41/*
42 * Power management can't be done in a interrupt context. So we have to
43 * use keventd.
44 */
45static int suspend_button_pushed = 0;
46static void suspend_button_task_handler(void *data)
47{
48 udelay(200); /* debounce */
49 suspend_button_pushed = 0;
50}
51
52static DECLARE_WORK(suspend_button_task, suspend_button_task_handler, NULL);
53
54static void power_event(struct input_handle *handle, unsigned int type,
55 unsigned int code, int down)
56{
57 struct input_dev *dev = handle->dev;
58
59 printk("Entering power_event\n");
60
61 if (type == EV_PWR) {
62 switch (code) {
63 case KEY_SUSPEND:
64 printk("Powering down entire device\n");
65
66 if (!suspend_button_pushed) {
67 suspend_button_pushed = 1;
68 schedule_work(&suspend_button_task);
69 }
70 break;
71 case KEY_POWER:
72 /* Hum power down the machine. */
73 break;
74 default:
75 return;
76 }
77 }
78
79 if (type == EV_KEY) {
80 switch (code) {
81 case KEY_SUSPEND:
82 printk("Powering down input device\n");
83 /* This is risky. See pm.h for details. */
84 if (dev->state != PM_RESUME)
85 dev->state = PM_RESUME;
86 else
87 dev->state = PM_SUSPEND;
88 pm_send(dev->pm_dev, dev->state, dev);
89 break;
90 case KEY_POWER:
91 /* Turn the input device off completely ? */
92 break;
93 default:
94 return;
95 }
96 }
97 return;
98}
99
100static struct input_handle *power_connect(struct input_handler *handler,
101 struct input_dev *dev,
102 struct input_device_id *id)
103{
104 struct input_handle *handle;
105
106 if (!(handle = kmalloc(sizeof(struct input_handle), GFP_KERNEL)))
107 return NULL;
108 memset(handle, 0, sizeof(struct input_handle));
109
110 handle->dev = dev;
111 handle->handler = handler;
112
113 input_open_device(handle);
114
115 printk(KERN_INFO "power.c: Adding power management to input layer\n");
116 return handle;
117}
118
119static void power_disconnect(struct input_handle *handle)
120{
121 input_close_device(handle);
122 kfree(handle);
123}
124
125static struct input_device_id power_ids[] = {
126 {
127 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
128 .evbit = { BIT(EV_KEY) },
129 .keybit = { [LONG(KEY_SUSPEND)] = BIT(KEY_SUSPEND) }
130 },
131 {
132 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
133 .evbit = { BIT(EV_KEY) },
134 .keybit = { [LONG(KEY_POWER)] = BIT(KEY_POWER) }
135 },
136 {
137 .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
138 .evbit = { BIT(EV_PWR) },
139 },
140 { }, /* Terminating entry */
141};
142
143MODULE_DEVICE_TABLE(input, power_ids);
144
145static struct input_handler power_handler = {
146 .event = power_event,
147 .connect = power_connect,
148 .disconnect = power_disconnect,
149 .name = "power",
150 .id_table = power_ids,
151};
152
153static int __init power_init(void)
154{
155 input_register_handler(&power_handler);
156 return 0;
157}
158
159static void __exit power_exit(void)
160{
161 input_unregister_handler(&power_handler);
162}
163
164module_init(power_init);
165module_exit(power_exit);
166
167MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
168MODULE_DESCRIPTION("Input Power Management driver");
169MODULE_LICENSE("GPL");