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123 lines
3.0 KiB
123 lines
3.0 KiB
// 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 <[email protected]>"); |
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MODULE_DESCRIPTION("Keyboard driver for OpenCores Keyboard Controller");
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