aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/sgi_btns.c
blob: 1a80c0dab83bce0204a6532413a759d830451fdc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
/*
 *  SGI Volume Button interface driver
 *
 *  Copyright (C) 2008  Thomas Bogendoerfer <tsbogend@alpha.franken.de>
 *
 *  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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
#include <linux/init.h>
#include <linux/input-polldev.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#ifdef CONFIG_SGI_IP22
#include <asm/sgi/ioc.h>

static inline u8 button_status(void)
{
	u8 status;

	status = readb(&sgioc->panel) ^ 0xa0;
	return ((status & 0x80) >> 6) | ((status & 0x20) >> 5);
}
#endif

#ifdef CONFIG_SGI_IP32
#include <asm/ip32/mace.h>

static inline u8 button_status(void)
{
	u64 status;

	status = readq(&mace->perif.audio.control);
	writeq(status & ~(3U << 23), &mace->perif.audio.control);

	return (status >> 23) & 3;
}
#endif

#define BUTTONS_POLL_INTERVAL	30	/* msec */
#define BUTTONS_COUNT_THRESHOLD	3

static const unsigned short sgi_map[] = {
	KEY_VOLUMEDOWN,
	KEY_VOLUMEUP
};

struct buttons_dev {
	struct input_polled_dev *poll_dev;
	unsigned short keymap[ARRAY_SIZE(sgi_map)];
	int count[ARRAY_SIZE(sgi_map)];
};

static void handle_buttons(struct input_polled_dev *dev)
{
	struct buttons_dev *bdev = dev->private;
	struct input_dev *input = dev->input;
	u8 status;
	int i;

	status = button_status();

	for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
		if (status & (1U << i)) {
			if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
				input_event(input, EV_MSC, MSC_SCAN, i);
				input_report_key(input, bdev->keymap[i], 1);
				input_sync(input);
			}
		} else {
			if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
				input_event(input, EV_MSC, MSC_SCAN, i);
				input_report_key(input, bdev->keymap[i], 0);
				input_sync(input);
			}
			bdev->count[i] = 0;
		}
	}
}

static int __devinit sgi_buttons_probe(struct platform_device *pdev)
{
	struct buttons_dev *bdev;
	struct input_polled_dev *poll_dev;
	struct input_dev *input;
	int error, i;

	bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
	poll_dev = input_allocate_polled_device();
	if (!bdev || !poll_dev) {
		error = -ENOMEM;
		goto err_free_mem;
	}

	memcpy(bdev->keymap, sgi_map, sizeof(bdev->keymap));

	poll_dev->private = bdev;
	poll_dev->poll = handle_buttons;
	poll_dev->poll_interval = BUTTONS_POLL_INTERVAL;

	input = poll_dev->input;
	input->name = "SGI buttons";
	input->phys = "sgi/input0";
	input->id.bustype = BUS_HOST;
	input->dev.parent = &pdev->dev;

	input->keycode = bdev->keymap;
	input->keycodemax = ARRAY_SIZE(bdev->keymap);
	input->keycodesize = sizeof(unsigned short);

	input_set_capability(input, EV_MSC, MSC_SCAN);
	__set_bit(EV_KEY, input->evbit);
	for (i = 0; i < ARRAY_SIZE(sgi_map); i++)
		__set_bit(bdev->keymap[i], input->keybit);
	__clear_bit(KEY_RESERVED, input->keybit);

	bdev->poll_dev = poll_dev;
	dev_set_drvdata(&pdev->dev, bdev);

	error = input_register_polled_device(poll_dev);
	if (error)
		goto err_free_mem;

	return 0;

 err_free_mem:
	input_free_polled_device(poll_dev);
	kfree(bdev);
	dev_set_drvdata(&pdev->dev, NULL);
	return error;
}

static int __devexit sgi_buttons_remove(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct buttons_dev *bdev = dev_get_drvdata(dev);

	input_unregister_polled_device(bdev->poll_dev);
	input_free_polled_device(bdev->poll_dev);
	kfree(bdev);
	dev_set_drvdata(dev, NULL);

	return 0;
}

static struct platform_driver sgi_buttons_driver = {
	.probe	= sgi_buttons_probe,
	.remove	= __devexit_p(sgi_buttons_remove),
	.driver	= {
		.name	= "sgibtns",
		.owner	= THIS_MODULE,
	},
};

static int __init sgi_buttons_init(void)
{
	return platform_driver_register(&sgi_buttons_driver);
}

static void __exit sgi_buttons_exit(void)
{
	platform_driver_unregister(&sgi_buttons_driver);
}

MODULE_LICENSE("GPL");
module_init(sgi_buttons_init);
module_exit(sgi_buttons_exit);