87 строки
1.8 KiB
C
87 строки
1.8 KiB
C
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/*
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* HID driver for Redragon keyboards
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*
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* Copyright (c) 2017 Robert Munteanu
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/device.h>
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#include <linux/hid.h>
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#include <linux/module.h>
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#include "hid-ids.h"
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/*
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* The Redragon Asura keyboard sends an incorrect HID descriptor.
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* At byte 100 it contains
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*
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* 0x81, 0x00
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*
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* which is Input (Data, Arr, Abs), but it should be
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*
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* 0x81, 0x02
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*
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* which is Input (Data, Var, Abs), which is consistent with the way
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* key codes are generated.
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*/
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static __u8 *redragon_report_fixup(struct hid_device *hdev, __u8 *rdesc,
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unsigned int *rsize)
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{
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if (*rsize >= 102 && rdesc[100] == 0x81 && rdesc[101] == 0x00) {
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dev_info(&hdev->dev, "Fixing Redragon ASURA report descriptor.\n");
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rdesc[101] = 0x02;
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}
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return rdesc;
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}
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static int redragon_probe(struct hid_device *dev,
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const struct hid_device_id *id)
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{
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int ret;
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ret = hid_parse(dev);
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if (ret) {
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hid_err(dev, "parse failed\n");
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return ret;
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}
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/* do not register unused input device */
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if (dev->maxapplication == 1)
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return 0;
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ret = hid_hw_start(dev, HID_CONNECT_DEFAULT);
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if (ret) {
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hid_err(dev, "hw start failed\n");
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return ret;
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}
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return 0;
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}
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static const struct hid_device_id redragon_devices[] = {
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{HID_USB_DEVICE(USB_VENDOR_ID_JESS, USB_DEVICE_ID_REDRAGON_ASURA)},
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{}
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};
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MODULE_DEVICE_TABLE(hid, redragon_devices);
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static struct hid_driver redragon_driver = {
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.name = "redragon",
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.id_table = redragon_devices,
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.report_fixup = redragon_report_fixup,
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.probe = redragon_probe
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};
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module_hid_driver(redragon_driver);
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MODULE_LICENSE("GPL");
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