1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * OpenCores Keyboard Controller Driver
4*4882a593Smuzhiyun * http://www.opencores.org/project,keyboardcontroller
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Copyright 2007-2009 HV Sistemas S.L.
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/input.h>
10*4882a593Smuzhiyun #include <linux/interrupt.h>
11*4882a593Smuzhiyun #include <linux/io.h>
12*4882a593Smuzhiyun #include <linux/ioport.h>
13*4882a593Smuzhiyun #include <linux/kernel.h>
14*4882a593Smuzhiyun #include <linux/module.h>
15*4882a593Smuzhiyun #include <linux/platform_device.h>
16*4882a593Smuzhiyun #include <linux/slab.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun struct opencores_kbd {
19*4882a593Smuzhiyun struct input_dev *input;
20*4882a593Smuzhiyun void __iomem *addr;
21*4882a593Smuzhiyun int irq;
22*4882a593Smuzhiyun unsigned short keycodes[128];
23*4882a593Smuzhiyun };
24*4882a593Smuzhiyun
opencores_kbd_isr(int irq,void * dev_id)25*4882a593Smuzhiyun static irqreturn_t opencores_kbd_isr(int irq, void *dev_id)
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun struct opencores_kbd *opencores_kbd = dev_id;
28*4882a593Smuzhiyun struct input_dev *input = opencores_kbd->input;
29*4882a593Smuzhiyun unsigned char c;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun c = readb(opencores_kbd->addr);
32*4882a593Smuzhiyun input_report_key(input, c & 0x7f, c & 0x80 ? 0 : 1);
33*4882a593Smuzhiyun input_sync(input);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun return IRQ_HANDLED;
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
opencores_kbd_probe(struct platform_device * pdev)38*4882a593Smuzhiyun static int opencores_kbd_probe(struct platform_device *pdev)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun struct input_dev *input;
41*4882a593Smuzhiyun struct opencores_kbd *opencores_kbd;
42*4882a593Smuzhiyun struct resource *res;
43*4882a593Smuzhiyun int irq, i, error;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
46*4882a593Smuzhiyun if (!res) {
47*4882a593Smuzhiyun dev_err(&pdev->dev, "missing board memory resource\n");
48*4882a593Smuzhiyun return -EINVAL;
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun irq = platform_get_irq(pdev, 0);
52*4882a593Smuzhiyun if (irq < 0)
53*4882a593Smuzhiyun return -EINVAL;
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun opencores_kbd = devm_kzalloc(&pdev->dev, sizeof(*opencores_kbd),
56*4882a593Smuzhiyun GFP_KERNEL);
57*4882a593Smuzhiyun if (!opencores_kbd)
58*4882a593Smuzhiyun return -ENOMEM;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun input = devm_input_allocate_device(&pdev->dev);
61*4882a593Smuzhiyun if (!input) {
62*4882a593Smuzhiyun dev_err(&pdev->dev, "failed to allocate input device\n");
63*4882a593Smuzhiyun return -ENOMEM;
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun opencores_kbd->input = input;
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun opencores_kbd->addr = devm_ioremap_resource(&pdev->dev, res);
69*4882a593Smuzhiyun if (IS_ERR(opencores_kbd->addr))
70*4882a593Smuzhiyun return PTR_ERR(opencores_kbd->addr);
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun input->name = pdev->name;
73*4882a593Smuzhiyun input->phys = "opencores-kbd/input0";
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun input->id.bustype = BUS_HOST;
76*4882a593Smuzhiyun input->id.vendor = 0x0001;
77*4882a593Smuzhiyun input->id.product = 0x0001;
78*4882a593Smuzhiyun input->id.version = 0x0100;
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun input->keycode = opencores_kbd->keycodes;
81*4882a593Smuzhiyun input->keycodesize = sizeof(opencores_kbd->keycodes[0]);
82*4882a593Smuzhiyun input->keycodemax = ARRAY_SIZE(opencores_kbd->keycodes);
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun __set_bit(EV_KEY, input->evbit);
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun for (i = 0; i < ARRAY_SIZE(opencores_kbd->keycodes); i++) {
87*4882a593Smuzhiyun /*
88*4882a593Smuzhiyun * OpenCores controller happens to have scancodes match
89*4882a593Smuzhiyun * our KEY_* definitions.
90*4882a593Smuzhiyun */
91*4882a593Smuzhiyun opencores_kbd->keycodes[i] = i;
92*4882a593Smuzhiyun __set_bit(opencores_kbd->keycodes[i], input->keybit);
93*4882a593Smuzhiyun }
94*4882a593Smuzhiyun __clear_bit(KEY_RESERVED, input->keybit);
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun error = devm_request_irq(&pdev->dev, irq, &opencores_kbd_isr,
97*4882a593Smuzhiyun IRQF_TRIGGER_RISING,
98*4882a593Smuzhiyun pdev->name, opencores_kbd);
99*4882a593Smuzhiyun if (error) {
100*4882a593Smuzhiyun dev_err(&pdev->dev, "unable to claim irq %d\n", irq);
101*4882a593Smuzhiyun return error;
102*4882a593Smuzhiyun }
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun error = input_register_device(input);
105*4882a593Smuzhiyun if (error) {
106*4882a593Smuzhiyun dev_err(&pdev->dev, "unable to register input device\n");
107*4882a593Smuzhiyun return error;
108*4882a593Smuzhiyun }
109*4882a593Smuzhiyun
110*4882a593Smuzhiyun return 0;
111*4882a593Smuzhiyun }
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun static struct platform_driver opencores_kbd_device_driver = {
114*4882a593Smuzhiyun .probe = opencores_kbd_probe,
115*4882a593Smuzhiyun .driver = {
116*4882a593Smuzhiyun .name = "opencores-kbd",
117*4882a593Smuzhiyun },
118*4882a593Smuzhiyun };
119*4882a593Smuzhiyun module_platform_driver(opencores_kbd_device_driver);
120*4882a593Smuzhiyun
121*4882a593Smuzhiyun MODULE_LICENSE("GPL");
122*4882a593Smuzhiyun MODULE_AUTHOR("Javier Herrero <jherrero@hvsistemas.es>");
123*4882a593Smuzhiyun MODULE_DESCRIPTION("Keyboard driver for OpenCores Keyboard Controller");
124