aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/cobalt_btns.c
blob: b14f49e768cca461be2fdee5b6a9676df834f3d2 (plain) (blame)
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
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
/*
 *  Cobalt button interface driver.
 *
 *  Copyright (C) 2007  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
 *
 *  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.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/jiffies.h>
#include <linux/timer.h>

#define BUTTONS_POLL_INTERVAL	30	/* msec */
#define BUTTONS_COUNT_THRESHOLD	3
#define BUTTONS_STATUS_MASK	0xfe000000

struct buttons_dev {
	struct input_dev *input;
	void __iomem *reg;
};

struct buttons_map {
	uint32_t mask;
	int keycode;
	int count;
};

static struct buttons_map buttons_map[] = {
	{ 0x02000000, KEY_RESTART, },
	{ 0x04000000, KEY_LEFT, },
	{ 0x08000000, KEY_UP, },
	{ 0x10000000, KEY_DOWN, },
	{ 0x20000000, KEY_RIGHT, },
	{ 0x40000000, KEY_ENTER, },
	{ 0x80000000, KEY_SELECT, },
};

static struct resource cobalt_buttons_resource __initdata = {
	.start	= 0x1d000000,
	.end	= 0x1d000003,
	.flags	= IORESOURCE_MEM,
};

static struct platform_device *cobalt_buttons_device;

static struct timer_list buttons_timer;

static void handle_buttons(unsigned long data)
{
	struct buttons_map *button = buttons_map;
	struct buttons_dev *bdev;
	uint32_t status;
	int i;

	bdev = (struct buttons_dev *)data;
	status = readl(bdev->reg);
	status = ~status & BUTTONS_STATUS_MASK;

	for (i = 0; i < ARRAY_SIZE(buttons_map); i++) {
		if (status & button->mask) {
			button->count++;
		} else {
			if (button->count >= BUTTONS_COUNT_THRESHOLD) {
				input_report_key(bdev->input, button->keycode, 0);
				input_sync(bdev->input);
			}
			button->count = 0;
		}

		if (button->count == BUTTONS_COUNT_THRESHOLD) {
			input_report_key(bdev->input, button->keycode, 1);
			input_sync(bdev->input);
		}

		button++;
	}

	mod_timer(&buttons_timer, jiffies + msecs_to_jiffies(BUTTONS_POLL_INTERVAL));
}

static int cobalt_buttons_open(struct input_dev *dev)
{
	mod_timer(&buttons_timer, jiffies + msecs_to_jiffies(BUTTONS_POLL_INTERVAL));

	return 0;
}

static void cobalt_buttons_close(struct input_dev *dev)
{
	del_timer_sync(&buttons_timer);
}

static int __devinit cobalt_buttons_probe(struct platform_device *pdev)
{
	struct buttons_dev *bdev;
	struct input_dev *input;
	struct resource *res;
	int error, i;

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

	input->name = "Cobalt buttons";
	input->phys = "cobalt/input0";
	input->id.bustype = BUS_HOST;
	input->cdev.dev = &pdev->dev;
	input->open = cobalt_buttons_open;
	input->close = cobalt_buttons_close;

	input->evbit[0] = BIT(EV_KEY);
	for (i = 0; i < ARRAY_SIZE(buttons_map); i++) {
		set_bit(buttons_map[i].keycode, input->keybit);
		buttons_map[i].count = 0;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		error = -EBUSY;
		goto err_free_mem;
	}

	bdev->input = input;
	bdev->reg = ioremap(res->start, res->end - res->start + 1);
	dev_set_drvdata(&pdev->dev, bdev);

	setup_timer(&buttons_timer, handle_buttons, (unsigned long)bdev);

	error = input_register_device(input);
	if (error)
		goto err_iounmap;

	return 0;

 err_iounmap:
	iounmap(bdev->reg);
 err_free_mem:
	input_free_device(input);
	kfree(bdev);
	dev_set_drvdata(&pdev->dev, NULL);
	return error;
}

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

	input_unregister_device(bdev->input);
	iounmap(bdev->reg);
	kfree(bdev);
	dev_set_drvdata(dev, NULL);

	return 0;
}

static struct platform_driver cobalt_buttons_driver = {
	.probe	= cobalt_buttons_probe,
	.remove	= __devexit_p(cobalt_buttons_remove),
	.driver	= {
		.name	= "Cobalt buttons",
		.owner	= THIS_MODULE,
	},
};

static int __init cobalt_buttons_init(void)
{
	int retval;

	cobalt_buttons_device = platform_device_register_simple("Cobalt buttons", -1,
	                                                        &cobalt_buttons_resource, 1);
	if (IS_ERR(cobalt_buttons_device)) {
		retval = PTR_ERR(cobalt_buttons_device);
		return retval;
	}

	retval = platform_driver_register(&cobalt_buttons_driver);
	if (retval < 0)
		platform_device_unregister(cobalt_buttons_device);

	return retval;
}

static void __exit cobalt_buttons_exit(void)
{
	platform_driver_unregister(&cobalt_buttons_driver);
	platform_device_unregister(cobalt_buttons_device);
}

module_init(cobalt_buttons_init);
module_exit(cobalt_buttons_exit);