aboutsummaryrefslogtreecommitdiff
path: root/drivers/input/misc/sgio2_btns.c
blob: b1ab43d903dd2d20658ab18a972b6f9a9afbaff4 (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
/*
 *  SGI O2 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 <asm/ip32/mace.h>

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

static const unsigned short sgio2_map[] = {
	KEY_VOLUMEUP,
	KEY_VOLUMEDOWN
};

struct buttons_dev {
	struct input_polled_dev *poll_dev;
	unsigned short keymap[ARRAY_SIZE(sgio2_map)];
	int count[ARRAY_SIZE(sgio2_map)];
	void __iomem *reg;
};

static void handle_buttons(struct input_polled_dev *dev)
{
	struct buttons_dev *bdev = dev->private;
	struct input_dev *input = dev->input;
	u64 status;
	int i;

	status = (readq(&mace->perif.audio.control) >> 23) & 3;

	for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
		if (status & (1U << i)) {
			writeq(status & ~(1U << i), &mace->perif.audio.control);
			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 sgio2_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, sgio2_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 O2 buttons";
	input->phys = "sgio2/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(sgio2_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 sgio2_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 sgio2_buttons_driver = {
	.probe	= sgio2_buttons_probe,
	.remove	= __devexit_p(sgio2_buttons_remove),
	.driver	= {
		.name	= "sgio2btns",
		.owner	= THIS_MODULE,
	},
};

static int __init sgio2_buttons_init(void)
{
	return platform_driver_register(&sgio2_buttons_driver);
}

static void __exit sgio2_buttons_exit(void)
{
	platform_driver_unregister(&sgio2_buttons_driver);
}

module_init(sgio2_buttons_init);
module_exit(sgio2_buttons_exit);