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	int irq, i, error;
43
44	irq = platform_get_irq(pdev, 0);
45	if (irq < 0)
46		return -EINVAL;
47
48	opencores_kbd = devm_kzalloc(&pdev->dev, sizeof(*opencores_kbd),
49				     GFP_KERNEL);
50	if (!opencores_kbd)
51		return -ENOMEM;
52
53	input = devm_input_allocate_device(&pdev->dev);
54	if (!input) {
55		dev_err(&pdev->dev, "failed to allocate input device\n");
56		return -ENOMEM;
57	}
58
59	opencores_kbd->input = input;
60
61	opencores_kbd->addr = devm_platform_ioremap_resource(pdev, 0);
62	if (IS_ERR(opencores_kbd->addr))
63		return PTR_ERR(opencores_kbd->addr);
64
65	input->name = pdev->name;
66	input->phys = "opencores-kbd/input0";
67
68	input->id.bustype = BUS_HOST;
69	input->id.vendor = 0x0001;
70	input->id.product = 0x0001;
71	input->id.version = 0x0100;
72
73	input->keycode = opencores_kbd->keycodes;
74	input->keycodesize = sizeof(opencores_kbd->keycodes[0]);
75	input->keycodemax = ARRAY_SIZE(opencores_kbd->keycodes);
76
77	__set_bit(EV_KEY, input->evbit);
78
79	for (i = 0; i < ARRAY_SIZE(opencores_kbd->keycodes); i++) {
80		/*
81		 * OpenCores controller happens to have scancodes match
82		 * our KEY_* definitions.
83		 */
84		opencores_kbd->keycodes[i] = i;
85		__set_bit(opencores_kbd->keycodes[i], input->keybit);
86	}
87	__clear_bit(KEY_RESERVED, input->keybit);
88
89	error = devm_request_irq(&pdev->dev, irq, &opencores_kbd_isr,
90				 IRQF_TRIGGER_RISING,
91				 pdev->name, opencores_kbd);
92	if (error) {
93		dev_err(&pdev->dev, "unable to claim irq %d\n", irq);
94		return error;
95	}
96
97	error = input_register_device(input);
98	if (error) {
99		dev_err(&pdev->dev, "unable to register input device\n");
100		return error;
101	}
102
103	return 0;
104}
105
106static struct platform_driver opencores_kbd_device_driver = {
107	.probe    = opencores_kbd_probe,
108	.driver   = {
109		.name = "opencores-kbd",
110	},
111};
112module_platform_driver(opencores_kbd_device_driver);
113
114MODULE_LICENSE("GPL");
115MODULE_AUTHOR("Javier Herrero <jherrero@hvsistemas.es>");
116MODULE_DESCRIPTION("Keyboard driver for OpenCores Keyboard Controller");
117