aboutsummaryrefslogtreecommitdiff
path: root/drivers/input/keyboard/opencores-kbd.c
blob: 1f1a5563f60a8b7c367acbd68543d998fb50cf8f (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
181
/*
 * OpenCores Keyboard Controller Driver
 * http://www.opencores.org/project,keyboardcontroller
 *
 * Copyright 2007-2009 HV Sistemas S.L.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

struct opencores_kbd {
	struct input_dev *input;
	struct resource *addr_res;
	void __iomem *addr;
	int irq;
	unsigned short keycodes[128];
};

static irqreturn_t opencores_kbd_isr(int irq, void *dev_id)
{
	struct opencores_kbd *opencores_kbd = dev_id;
	struct input_dev *input = opencores_kbd->input;
	unsigned char c;

	c = readb(opencores_kbd->addr);
	input_report_key(input, c & 0x7f, c & 0x80 ? 0 : 1);
	input_sync(input);

	return IRQ_HANDLED;
}

static int __devinit opencores_kbd_probe(struct platform_device *pdev)
{
	struct input_dev *input;
	struct opencores_kbd *opencores_kbd;
	struct resource *res;
	int irq, i, error;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "missing board memory resource\n");
		return -EINVAL;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(&pdev->dev, "missing board IRQ resource\n");
		return -EINVAL;
	}

	opencores_kbd = kzalloc(sizeof(*opencores_kbd), GFP_KERNEL);
	input = input_allocate_device();
	if (!opencores_kbd || !input) {
		dev_err(&pdev->dev, "failed to allocate device structures\n");
		error = -ENOMEM;
		goto err_free_mem;
	}

	opencores_kbd->addr_res = res;
	res = request_mem_region(res->start, resource_size(res), pdev->name);
	if (!res) {
		dev_err(&pdev->dev, "failed to request I/O memory\n");
		error = -EBUSY;
		goto err_free_mem;
	}

	opencores_kbd->addr = ioremap(res->start, resource_size(res));
	if (!opencores_kbd->addr) {
		dev_err(&pdev->dev, "failed to remap I/O memory\n");
		error = -ENXIO;
		goto err_rel_mem;
	}

	opencores_kbd->input = input;
	opencores_kbd->irq = irq;

	input->name = pdev->name;
	input->phys = "opencores-kbd/input0";
	input->dev.parent = &pdev->dev;

	input_set_drvdata(input, opencores_kbd);

	input->id.bustype = BUS_HOST;
	input->id.vendor = 0x0001;
	input->id.product = 0x0001;
	input->id.version = 0x0100;

	input->keycode = opencores_kbd->keycodes;
	input->keycodesize = sizeof(opencores_kbd->keycodes[0]);
	input->keycodemax = ARRAY_SIZE(opencores_kbd->keycodes);

	__set_bit(EV_KEY, input->evbit);

	for (i = 0; i < ARRAY_SIZE(opencores_kbd->keycodes); i++) {
		/*
		 * OpenCores controller happens to have scancodes match
		 * our KEY_* definitions.
		 */
		opencores_kbd->keycodes[i] = i;
		__set_bit(opencores_kbd->keycodes[i], input->keybit);
	}
	__clear_bit(KEY_RESERVED, input->keybit);

	error = request_irq(irq, &opencores_kbd_isr,
			    IRQF_TRIGGER_RISING, pdev->name, opencores_kbd);
	if (error) {
		dev_err(&pdev->dev, "unable to claim irq %d\n", irq);
		goto err_unmap_mem;
	}

	error = input_register_device(input);
	if (error) {
		dev_err(&pdev->dev, "unable to register input device\n");
		goto err_free_irq;
	}

	platform_set_drvdata(pdev, opencores_kbd);

	return 0;

 err_free_irq:
	free_irq(irq, opencores_kbd);
 err_unmap_mem:
	iounmap(opencores_kbd->addr);
 err_rel_mem:
	release_mem_region(res->start, resource_size(res));
 err_free_mem:
	input_free_device(input);
	kfree(opencores_kbd);

	return error;
}

static int __devexit opencores_kbd_remove(struct platform_device *pdev)
{
	struct opencores_kbd *opencores_kbd = platform_get_drvdata(pdev);

	free_irq(opencores_kbd->irq, opencores_kbd);

	iounmap(opencores_kbd->addr);
	release_mem_region(opencores_kbd->addr_res->start,
		resource_size(opencores_kbd->addr_res));
	input_unregister_device(opencores_kbd->input);
	kfree(opencores_kbd);

	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct platform_driver opencores_kbd_device_driver = {
	.probe    = opencores_kbd_probe,
	.remove   = __devexit_p(opencores_kbd_remove),
	.driver   = {
		.name = "opencores-kbd",
	},
};

static int __init opencores_kbd_init(void)
{
	return platform_driver_register(&opencores_kbd_device_driver);
}
module_init(opencores_kbd_init);

static void __exit opencores_kbd_exit(void)
{
	platform_driver_unregister(&opencores_kbd_device_driver);
}
module_exit(opencores_kbd_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Javier Herrero <jherrero@hvsistemas.es>");
MODULE_DESCRIPTION("Keyboard driver for OpenCores Keyboard Controller");