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(addr: opencores_kbd->addr);
32 input_report_key(dev: input, code: c & 0x7f, value: c & 0x80 ? 0 : 1);
33 input_sync(dev: 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(dev: &pdev->dev, size: 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, index: 0);
62 if (IS_ERR(ptr: opencores_kbd->addr))
63 return PTR_ERR(ptr: 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(dev: &pdev->dev, irq, handler: &opencores_kbd_isr,
90 IRQF_TRIGGER_RISING,
91 devname: pdev->name, dev_id: 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

source code of linux/drivers/input/keyboard/opencores-kbd.c