e28d264b9e066b74ce6e84872d921d5da667cef1
[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/input.h>
32 #include <linux/slab.h>
33 #include <linux/init.h>
34 #include <linux/tty.h>
35 #include <linux/delay.h>
36 #include <linux/pm.h>
37
38 static struct input_handler power_handler;
39
40 /*
41  * Power management can't be done in a interrupt context. So we have to
42  * use keventd.
43  */
44 static int suspend_button_pushed;
45 static void suspend_button_task_handler(struct work_struct *work)
46 {
47         udelay(200); /* debounce */
48         suspend_button_pushed = 0;
49 }
50
51 static DECLARE_WORK(suspend_button_task, suspend_button_task_handler);
52
53 static void power_event(struct input_handle *handle, unsigned int type,
54                         unsigned int code, int down)
55 {
56         struct input_dev *dev = handle->dev;
57
58         printk("Entering power_event\n");
59
60         if (type == EV_PWR) {
61                 switch (code) {
62                         case KEY_SUSPEND:
63                                 printk("Powering down entire device\n");
64
65                                 if (!suspend_button_pushed) {
66                                         suspend_button_pushed = 1;
67                                         schedule_work(&suspend_button_task);
68                                 }
69                                 break;
70                         case KEY_POWER:
71                                 /* Hum power down the machine. */
72                                 break;
73                         default:
74                                 return;
75                 }
76         }
77
78         if (type == EV_KEY) {
79                 switch (code) {
80                         case KEY_SUSPEND:
81                                 printk("Powering down input device\n");
82                                 /* This is risky. See pm.h for details. */
83                                 if (dev->state != PM_RESUME)
84                                         dev->state = PM_RESUME;
85                                 else
86                                         dev->state = PM_SUSPEND;
87                                  /* pm_send(dev->pm_dev, dev->state, dev); */
88                                 break;
89                         case KEY_POWER:
90                                 /* Turn the input device off completely ? */
91                                 break;
92                         default:
93                                 return;
94                 }
95         }
96         return;
97 }
98
99 static int power_connect(struct input_handler *handler, struct input_dev *dev,
100                          const struct input_device_id *id)
101 {
102         struct input_handle *handle;
103         int error;
104
105         handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
106         if (!handle)
107                 return -ENOMEM;
108
109         handle->dev = dev;
110         handle->handler = handler;
111         handle->name = "power";
112
113         error = input_register_handle(handle);
114         if (error)
115                 goto err_free_handle;
116
117         error = input_open_device(handle);
118         if (error)
119                 goto err_unregister_handle;
120
121         return 0;
122
123  err_unregister_handle:
124         input_unregister_handle(handle);
125  err_free_handle:
126         kfree(handle);
127         return error;
128 }
129
130 static void power_disconnect(struct input_handle *handle)
131 {
132         input_close_device(handle);
133         input_unregister_handle(handle);
134         kfree(handle);
135 }
136
137 static const struct input_device_id power_ids[] = {
138         {
139                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
140                 .evbit = { BIT(EV_KEY) },
141                 .keybit = { [LONG(KEY_SUSPEND)] = BIT(KEY_SUSPEND) }
142         },
143         {
144                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
145                 .evbit = { BIT(EV_KEY) },
146                 .keybit = { [LONG(KEY_POWER)] = BIT(KEY_POWER) }
147         },
148         {
149                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
150                 .evbit = { BIT(EV_PWR) },
151         },
152         { },    /* Terminating entry */
153 };
154
155 MODULE_DEVICE_TABLE(input, power_ids);
156
157 static struct input_handler power_handler = {
158         .event =        power_event,
159         .connect =      power_connect,
160         .disconnect =   power_disconnect,
161         .name =         "power",
162         .id_table =     power_ids,
163 };
164
165 static int __init power_init(void)
166 {
167         return input_register_handler(&power_handler);
168 }
169
170 static void __exit power_exit(void)
171 {
172         input_unregister_handler(&power_handler);
173 }
174
175 module_init(power_init);
176 module_exit(power_exit);
177
178 MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
179 MODULE_DESCRIPTION("Input Power Management driver");
180 MODULE_LICENSE("GPL");