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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/input/keyboard/opencores-kbd.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/input/keyboard/opencores-kbd.c')
-rw-r--r-- | drivers/input/keyboard/opencores-kbd.c | 123 |
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"); |