1/*
2 * OpenCores Keyboard Controller Driver
3 * http://www.opencores.org/project,keyboardcontroller
4 *
5 * Copyright 2007-2009 HV Sistemas S.L.
6 *
7 * Licensed under the GPL-2 or later.
8 */
9
10#include <linux/input.h>
11#include <linux/interrupt.h>
12#include <linux/io.h>
13#include <linux/ioport.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/platform_device.h>
17#include <linux/slab.h>
18
19struct opencores_kbd {
20	struct input_dev *input;
21	void __iomem *addr;
22	int irq;
23	unsigned short keycodes[128];
24};
25
26static irqreturn_t opencores_kbd_isr(int irq, void *dev_id)
27{
28	struct opencores_kbd *opencores_kbd = dev_id;
29	struct input_dev *input = opencores_kbd->input;
30	unsigned char c;
31
32	c = readb(opencores_kbd->addr);
33	input_report_key(input, c & 0x7f, c & 0x80 ? 0 : 1);
34	input_sync(input);
35
36	return IRQ_HANDLED;
37}
38
39static int opencores_kbd_probe(struct platform_device *pdev)
40{
41	struct input_dev *input;
42	struct opencores_kbd *opencores_kbd;
43	struct resource *res;
44	int irq, i, error;
45
46	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
47	if (!res) {
48		dev_err(&pdev->dev, "missing board memory resource\n");
49		return -EINVAL;
50	}
51
52	irq = platform_get_irq(pdev, 0);
53	if (irq < 0) {
54		dev_err(&pdev->dev, "missing board IRQ resource\n");
55		return -EINVAL;
56	}
57
58	opencores_kbd = devm_kzalloc(&pdev->dev, sizeof(*opencores_kbd),
59				     GFP_KERNEL);
60	if (!opencores_kbd)
61		return -ENOMEM;
62
63	input = devm_input_allocate_device(&pdev->dev);
64	if (!input) {
65		dev_err(&pdev->dev, "failed to allocate input device\n");
66		return -ENOMEM;
67	}
68
69	opencores_kbd->input = input;
70
71	opencores_kbd->addr = devm_ioremap_resource(&pdev->dev, res);
72	if (IS_ERR(opencores_kbd->addr))
73		return PTR_ERR(opencores_kbd->addr);
74
75	input->name = pdev->name;
76	input->phys = "opencores-kbd/input0";
77
78	input_set_drvdata(input, opencores_kbd);
79
80	input->id.bustype = BUS_HOST;
81	input->id.vendor = 0x0001;
82	input->id.product = 0x0001;
83	input->id.version = 0x0100;
84
85	input->keycode = opencores_kbd->keycodes;
86	input->keycodesize = sizeof(opencores_kbd->keycodes[0]);
87	input->keycodemax = ARRAY_SIZE(opencores_kbd->keycodes);
88
89	__set_bit(EV_KEY, input->evbit);
90
91	for (i = 0; i < ARRAY_SIZE(opencores_kbd->keycodes); i++) {
92		/*
93		 * OpenCores controller happens to have scancodes match
94		 * our KEY_* definitions.
95		 */
96		opencores_kbd->keycodes[i] = i;
97		__set_bit(opencores_kbd->keycodes[i], input->keybit);
98	}
99	__clear_bit(KEY_RESERVED, input->keybit);
100
101	error = devm_request_irq(&pdev->dev, irq, &opencores_kbd_isr,
102				 IRQF_TRIGGER_RISING,
103				 pdev->name, opencores_kbd);
104	if (error) {
105		dev_err(&pdev->dev, "unable to claim irq %d\n", irq);
106		return error;
107	}
108
109	error = input_register_device(input);
110	if (error) {
111		dev_err(&pdev->dev, "unable to register input device\n");
112		return error;
113	}
114
115	platform_set_drvdata(pdev, opencores_kbd);
116
117	return 0;
118}
119
120static struct platform_driver opencores_kbd_device_driver = {
121	.probe    = opencores_kbd_probe,
122	.driver   = {
123		.name = "opencores-kbd",
124	},
125};
126module_platform_driver(opencores_kbd_device_driver);
127
128MODULE_LICENSE("GPL");
129MODULE_AUTHOR("Javier Herrero <jherrero@hvsistemas.es>");
130MODULE_DESCRIPTION("Keyboard driver for OpenCores Keyboard Controller");
131