Linux-2.6.12-rc2
[linux-2.6.git] / drivers / input / power.c
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
39 static 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  */
45 static int suspend_button_pushed = 0;
46 static void suspend_button_task_handler(void *data)
47 {
48         udelay(200); /* debounce */
49         suspend_button_pushed = 0;
50 }
51
52 static DECLARE_WORK(suspend_button_task, suspend_button_task_handler, NULL);
53
54 static 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
100 static 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
119 static void power_disconnect(struct input_handle *handle)
120 {
121         input_close_device(handle);
122         kfree(handle);
123 }
124
125 static 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
143 MODULE_DEVICE_TABLE(input, power_ids);
144
145 static 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
153 static int __init power_init(void)
154 {
155         input_register_handler(&power_handler);
156         return 0;
157 }
158
159 static void __exit power_exit(void)
160 {
161         input_unregister_handler(&power_handler);
162 }
163
164 module_init(power_init);
165 module_exit(power_exit);
166
167 MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
168 MODULE_DESCRIPTION("Input Power Management driver");
169 MODULE_LICENSE("GPL");