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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* OpenCores Keyboard Controller Driver
* http://www.opencores.org/project,keyboardcontroller
*
* Copyright 2007-2009 HV Sistemas S.L.
*/
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
struct opencores_kbd {
struct input_dev *input;
void __iomem *addr;
int irq;
unsigned short keycodes[128];
};
static irqreturn_t opencores_kbd_isr(int irq, void *dev_id)
{
struct opencores_kbd *opencores_kbd = dev_id;
struct input_dev *input = opencores_kbd->input;
unsigned char c;
c = readb(opencores_kbd->addr);
input_report_key(input, c & 0x7f, c & 0x80 ? 0 : 1);
input_sync(input);
return IRQ_HANDLED;
}
static int opencores_kbd_probe(struct platform_device *pdev)
{
struct input_dev *input;
struct opencores_kbd *opencores_kbd;
struct resource *res;
int irq, i, error;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "missing board memory resource\n");
return -EINVAL;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return -EINVAL;
opencores_kbd = devm_kzalloc(&pdev->dev, sizeof(*opencores_kbd),
GFP_KERNEL);
if (!opencores_kbd)
return -ENOMEM;
input = devm_input_allocate_device(&pdev->dev);
if (!input) {
dev_err(&pdev->dev, "failed to allocate input device\n");
return -ENOMEM;
}
opencores_kbd->input = input;
opencores_kbd->addr = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(opencores_kbd->addr))
return PTR_ERR(opencores_kbd->addr);
input->name = pdev->name;
input->phys = "opencores-kbd/input0";
input->id.bustype = BUS_HOST;
input->id.vendor = 0x0001;
input->id.product = 0x0001;
input->id.version = 0x0100;
input->keycode = opencores_kbd->keycodes;
input->keycodesize = sizeof(opencores_kbd->keycodes[0]);
input->keycodemax = ARRAY_SIZE(opencores_kbd->keycodes);
__set_bit(EV_KEY, input->evbit);
for (i = 0; i < ARRAY_SIZE(opencores_kbd->keycodes); i++) {
/*
* OpenCores controller happens to have scancodes match
* our KEY_* definitions.
*/
opencores_kbd->keycodes[i] = i;
__set_bit(opencores_kbd->keycodes[i], input->keybit);
}
__clear_bit(KEY_RESERVED, input->keybit);
error = devm_request_irq(&pdev->dev, irq, &opencores_kbd_isr,
IRQF_TRIGGER_RISING,
pdev->name, opencores_kbd);
if (error) {
dev_err(&pdev->dev, "unable to claim irq %d\n", irq);
return error;
}
error = input_register_device(input);
if (error) {
dev_err(&pdev->dev, "unable to register input device\n");
return error;
}
return 0;
}
static struct platform_driver opencores_kbd_device_driver = {
.probe = opencores_kbd_probe,
.driver = {
.name = "opencores-kbd",
},
};
module_platform_driver(opencores_kbd_device_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Javier Herrero <jherrero@hvsistemas.es>");
MODULE_DESCRIPTION("Keyboard driver for OpenCores Keyboard Controller");
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