1 files changed, 123 insertions, 0 deletions
diff --git a/drivers/input/keyboard/opencores-kbd.c b/drivers/input/keyboard/opencores-kbd.c
new file mode 100644
index 000000000..b0ea38741
--- /dev/null
+++ b/drivers/input/keyboard/opencores-kbd.c
@@ -0,0 +1,123 @@
+// 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");