[linux.git] / drivers / hid / hid-redragon.c

/*
 *  HID driver for Redragon keyboards
 *
 *  Copyright (c) 2017 Robert Munteanu
 *  SPDX-License-Identifier: GPL-2.0+
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 */

#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>

#include "hid-ids.h"


/*
 * The Redragon Asura keyboard sends an incorrect HID descriptor.
 * At byte 100 it contains
 *
 *   0x81, 0x00
 *
 * which is Input (Data, Arr, Abs), but it should be
 *
 *   0x81, 0x02
 *
 * which is Input (Data, Var, Abs), which is consistent with the way
 * key codes are generated.
 */

static __u8 *redragon_report_fixup(struct hid_device *hdev, __u8 *rdesc,
	unsigned int *rsize)
{
	if (*rsize >= 102 && rdesc[100] == 0x81 && rdesc[101] == 0x00) {
		dev_info(&hdev->dev, "Fixing Redragon ASURA report descriptor.\n");
		rdesc[101] = 0x02;
	}

	return rdesc;
}

static const struct hid_device_id redragon_devices[] = {
	{HID_USB_DEVICE(USB_VENDOR_ID_JESS, USB_DEVICE_ID_REDRAGON_ASURA)},
	{}
};

MODULE_DEVICE_TABLE(hid, redragon_devices);

static struct hid_driver redragon_driver = {
	.name = "redragon",
	.id_table = redragon_devices,
	.report_fixup = redragon_report_fixup
};

module_hid_driver(redragon_driver);

MODULE_LICENSE("GPL");
Commit	Line	Data
85455dd9 RM	1	/*
	2	* HID driver for Redragon keyboards
	3	*
	4	* Copyright (c) 2017 Robert Munteanu
	5	* SPDX-License-Identifier: GPL-2.0+
	6	*/
	7
	8	/*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the Free
	11	* Software Foundation; either version 2 of the License, or (at your option)
	12	* any later version.
	13	*/
	14
	15	#include <linux/device.h>
	16	#include <linux/hid.h>
	17	#include <linux/module.h>
	18
	19	#include "hid-ids.h"
	20
	21
	22	/*
	23	* The Redragon Asura keyboard sends an incorrect HID descriptor.
	24	* At byte 100 it contains
	25	*
	26	* 0x81, 0x00
	27	*
	28	* which is Input (Data, Arr, Abs), but it should be
	29	*
	30	* 0x81, 0x02
	31	*
	32	* which is Input (Data, Var, Abs), which is consistent with the way
	33	* key codes are generated.
	34	*/
	35
	36	static __u8 redragon_report_fixup(struct hid_device hdev, __u8 *rdesc,
	37	unsigned int *rsize)
	38	{
	39	if (*rsize >= 102 && rdesc[100] == 0x81 && rdesc[101] == 0x00) {
	40	dev_info(&hdev->dev, "Fixing Redragon ASURA report descriptor.\n");
	41	rdesc[101] = 0x02;
	42	}
	43
	44	return rdesc;
	45	}
	46
85455dd9 RM	47	static const struct hid_device_id redragon_devices[] = {
	48	{HID_USB_DEVICE(USB_VENDOR_ID_JESS, USB_DEVICE_ID_REDRAGON_ASURA)},
	49	{}
	50	};
	51
	52	MODULE_DEVICE_TABLE(hid, redragon_devices);
	53
	54	static struct hid_driver redragon_driver = {
	55	.name = "redragon",
	56	.id_table = redragon_devices,
dc9b8e85	57	.report_fixup = redragon_report_fixup
85455dd9 RM	58	};
	59
	60	module_hid_driver(redragon_driver);
	61
	62	MODULE_LICENSE("GPL");