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1da177e4 LT |
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"); |