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