cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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opencores-kbd.c (3045B)

      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	struct resource *res;
     43	int irq, i, error;
     44
     45	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
     46	if (!res) {
     47		dev_err(&pdev->dev, "missing board memory resource\n");
     48		return -EINVAL;
     49	}
     50
     51	irq = platform_get_irq(pdev, 0);
     52	if (irq < 0)
     53		return -EINVAL;
     54
     55	opencores_kbd = devm_kzalloc(&pdev->dev, sizeof(*opencores_kbd),
     56				     GFP_KERNEL);
     57	if (!opencores_kbd)
     58		return -ENOMEM;
     59
     60	input = devm_input_allocate_device(&pdev->dev);
     61	if (!input) {
     62		dev_err(&pdev->dev, "failed to allocate input device\n");
     63		return -ENOMEM;
     64	}
     65
     66	opencores_kbd->input = input;
     67
     68	opencores_kbd->addr = devm_ioremap_resource(&pdev->dev, res);
     69	if (IS_ERR(opencores_kbd->addr))
     70		return PTR_ERR(opencores_kbd->addr);
     71
     72	input->name = pdev->name;
     73	input->phys = "opencores-kbd/input0";
     74
     75	input->id.bustype = BUS_HOST;
     76	input->id.vendor = 0x0001;
     77	input->id.product = 0x0001;
     78	input->id.version = 0x0100;
     79
     80	input->keycode = opencores_kbd->keycodes;
     81	input->keycodesize = sizeof(opencores_kbd->keycodes[0]);
     82	input->keycodemax = ARRAY_SIZE(opencores_kbd->keycodes);
     83
     84	__set_bit(EV_KEY, input->evbit);
     85
     86	for (i = 0; i < ARRAY_SIZE(opencores_kbd->keycodes); i++) {
     87		/*
     88		 * OpenCores controller happens to have scancodes match
     89		 * our KEY_* definitions.
     90		 */
     91		opencores_kbd->keycodes[i] = i;
     92		__set_bit(opencores_kbd->keycodes[i], input->keybit);
     93	}
     94	__clear_bit(KEY_RESERVED, input->keybit);
     95
     96	error = devm_request_irq(&pdev->dev, irq, &opencores_kbd_isr,
     97				 IRQF_TRIGGER_RISING,
     98				 pdev->name, opencores_kbd);
     99	if (error) {
    100		dev_err(&pdev->dev, "unable to claim irq %d\n", irq);
    101		return error;
    102	}
    103
    104	error = input_register_device(input);
    105	if (error) {
    106		dev_err(&pdev->dev, "unable to register input device\n");
    107		return error;
    108	}
    109
    110	return 0;
    111}
    112
    113static struct platform_driver opencores_kbd_device_driver = {
    114	.probe    = opencores_kbd_probe,
    115	.driver   = {
    116		.name = "opencores-kbd",
    117	},
    118};
    119module_platform_driver(opencores_kbd_device_driver);
    120
    121MODULE_LICENSE("GPL");
    122MODULE_AUTHOR("Javier Herrero <jherrero@hvsistemas.es>");
    123MODULE_DESCRIPTION("Keyboard driver for OpenCores Keyboard Controller");