1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * OpenCores Keyboard Controller Driver
4 * http://www.opencores.org/project,keyboardcontroller
5 *
6 * Copyright 2007-2009 HV Sistemas S.L.
7 */
8
9#include <linux/input.h>
10#include <linux/interrupt.h>
11#include <linux/io.h>
12#include <linux/ioport.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/slab.h>
17
18struct opencores_kbd {
19	struct input_dev *input;
20	void __iomem *addr;
21	int irq;
22	unsigned short keycodes[128];
23};
24
25static irqreturn_t opencores_kbd_isr(int irq, void *dev_id)
26{
27	struct opencores_kbd *opencores_kbd = dev_id;
28	struct input_dev *input = opencores_kbd->input;
29	unsigned char c;
30
31	c = readb(opencores_kbd->addr);
32	input_report_key(input, c & 0x7f, c & 0x80 ? 0 : 1);
33	input_sync(input);
34
35	return IRQ_HANDLED;
36}
37
38static int opencores_kbd_probe(struct platform_device *pdev)
39{
40	struct input_dev *input;
41	struct opencores_kbd *opencores_kbd;
42	struct resource *res;
43	int irq, i, error;
44
45	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
46	if (!res) {
47		dev_err(&pdev->dev, "missing board memory resource\n");
48		return -EINVAL;
49	}
50
51	irq = platform_get_irq(pdev, 0);
52	if (irq < 0)
53		return -EINVAL;
54
55	opencores_kbd = devm_kzalloc(&pdev->dev, sizeof(*opencores_kbd),
56				     GFP_KERNEL);
57	if (!opencores_kbd)
58		return -ENOMEM;
59
60	input = devm_input_allocate_device(&pdev->dev);
61	if (!input) {
62		dev_err(&pdev->dev, "failed to allocate input device\n");
63		return -ENOMEM;
64	}
65
66	opencores_kbd->input = input;
67
68	opencores_kbd->addr = devm_ioremap_resource(&pdev->dev, res);
69	if (IS_ERR(opencores_kbd->addr))
70		return PTR_ERR(opencores_kbd->addr);
71
72	input->name = pdev->name;
73	input->phys = "opencores-kbd/input0";
74
75	input->id.bustype = BUS_HOST;
76	input->id.vendor = 0x0001;
77	input->id.product = 0x0001;
78	input->id.version = 0x0100;
79
80	input->keycode = opencores_kbd->keycodes;
81	input->keycodesize = sizeof(opencores_kbd->keycodes[0]);
82	input->keycodemax = ARRAY_SIZE(opencores_kbd->keycodes);
83
84	__set_bit(EV_KEY, input->evbit);
85
86	for (i = 0; i < ARRAY_SIZE(opencores_kbd->keycodes); i++) {
87		/*
88		 * OpenCores controller happens to have scancodes match
89		 * our KEY_* definitions.
90		 */
91		opencores_kbd->keycodes[i] = i;
92		__set_bit(opencores_kbd->keycodes[i], input->keybit);
93	}
94	__clear_bit(KEY_RESERVED, input->keybit);
95
96	error = devm_request_irq(&pdev->dev, irq, &opencores_kbd_isr,
97				 IRQF_TRIGGER_RISING,
98				 pdev->name, opencores_kbd);
99	if (error) {
100		dev_err(&pdev->dev, "unable to claim irq %d\n", irq);
101		return error;
102	}
103
104	error = input_register_device(input);
105	if (error) {
106		dev_err(&pdev->dev, "unable to register input device\n");
107		return error;
108	}
109
110	return 0;
111}
112
113static struct platform_driver opencores_kbd_device_driver = {
114	.probe    = opencores_kbd_probe,
115	.driver   = {
116		.name = "opencores-kbd",
117	},
118};
119module_platform_driver(opencores_kbd_device_driver);
120
121MODULE_LICENSE("GPL");
122MODULE_AUTHOR("Javier Herrero <jherrero@hvsistemas.es>");
123MODULE_DESCRIPTION("Keyboard driver for OpenCores Keyboard Controller");
124