arnekeller/microsoft-ergonomic-keyboard
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Arne Keller 2021-09-13 09:53:24 +02:00
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1
Makefile Normal file
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obj-m += hid-microsoft-ergonomic.o

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hid-microsoft-ergonomic.c Normal file
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* HID driver for the microsoft ergonomic keyboard
*
* Copyright (c) 2021 Arne Keller
*/
#include <linux/device.h>
#include <linux/input.h>
#include <linux/hid.h>
#include <linux/module.h>
#define USB_VENDOR_ID_MICROSOFT 0x045e
#define USB_DEVICE_ID_MS_ERGONOMIC_KEYBOARD 0x082c
#define MS_ERGONOMY2 BIT(8)
struct ms_data {
unsigned long quirks;
struct hid_device *hdev;
__u8 strong;
__u8 weak;
void *output_report_dmabuf;
};
static int ms_raw_event(struct hid_device *hdev, struct hid_report *report,
u8 *data, int size)
{
struct ms_data *ms = hid_get_drvdata(hdev);
unsigned long quirks = ms->quirks;
if (!(hdev->claimed & HID_CLAIMED_INPUT))
return 0;
if (quirks & MS_ERGONOMY2) {
if (size == 8 && ((data[1] & 0x0f) == 0x0f)) {
hid_info(hdev, "remapped button %x :)", data[1]);
// weird Office button just simulates Left Shift + Ctrl + Alt + Super!
data[1] |= 0x80; // other combination keys might also be pressed!
data[1] &= 0xf0; // clear the 4 key mess
}
/*
hid_info(hdev, "event of size %d", size);
int size2 = size;
while (size2 > 0) {
printk(KERN_CONT " %x", *data);
size2--;
data++;
}
printk(KERN_CONT "\n");
*/
}
return 0;
}
static int ms_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
unsigned long quirks = id->driver_data;
struct ms_data *ms;
int ret;
ms = devm_kzalloc(&hdev->dev, sizeof(*ms), GFP_KERNEL);
if (ms == NULL)
return -ENOMEM;
ms->quirks = quirks;
hid_set_drvdata(hdev, ms);
ret = hid_parse(hdev);
if (ret) {
hid_err(hdev, "parse failed\n");
goto err_free;
}
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
if (ret) {
hid_err(hdev, "hw start failed\n");
goto err_free;
}
return 0;
err_free:
return ret;
}
static void ms_remove(struct hid_device *hdev)
{
hid_hw_stop(hdev);
}
static const struct hid_device_id ms_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_ERGONOMIC_KEYBOARD),
.driver_data = MS_ERGONOMY2},
{ }
};
MODULE_DEVICE_TABLE(hid, ms_devices);
static struct hid_driver ms_driver = {
.name = "microsoft_ergonomic",
.id_table = ms_devices,
.raw_event = ms_raw_event,
.probe = ms_probe,
.remove = ms_remove,
};
module_hid_driver(ms_driver);
MODULE_LICENSE("GPL");