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/drivers/input/keyboard/opencores-kbd.c

http://github.com/mirrors/linux
C | 123 lines | 90 code | 22 blank | 11 comment | 8 complexity | 0f5256acb3e9a2ccb161fc8da3e8b181 MD5 | raw file
  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");