drivers/hid/hid-sunplus.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  HID driver for some sunplus "special" devices
 *
 *  Copyright (c) 1999 Andreas Gal
 *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
 *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
 *  Copyright (c) 2006-2007 Jiri Kosina
 *  Copyright (c) 2008 Jiri Slaby
 */

/*
 */

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

#include "hid-ids.h"

static const __u8 *sp_report_fixup(struct hid_device *hdev, __u8 *rdesc,
		unsigned int *rsize)
{
	if (*rsize >= 112 && rdesc[104] == 0x26 && rdesc[105] == 0x80 &&
			rdesc[106] == 0x03) {
		hid_info(hdev, "fixing up Sunplus Wireless Desktop report descriptor\n");
		rdesc[105] = rdesc[110] = 0x03;
		rdesc[106] = rdesc[111] = 0x21;
	}
	return rdesc;
}

#define sp_map_key_clear(c)	hid_map_usage_clear(hi, usage, bit, max, \
		EV_KEY, (c))
static int sp_input_mapping(struct hid_device *hdev, struct hid_input *hi,
		struct hid_field *field, struct hid_usage *usage,
		unsigned long **bit, int *max)
{
	if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
		return 0;

	switch (usage->hid & HID_USAGE) {
	case 0x2003: sp_map_key_clear(KEY_ZOOMIN);		break;
	case 0x2103: sp_map_key_clear(KEY_ZOOMOUT);	break;
	default:
		return 0;
	}
	return 1;
}

static const struct hid_device_id sp_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_SUNPLUS, USB_DEVICE_ID_SUNPLUS_WDESKTOP) },
	{ }
};
MODULE_DEVICE_TABLE(hid, sp_devices);

static struct hid_driver sp_driver = {
	.name = "sunplus",
	.id_table = sp_devices,
	.report_fixup = sp_report_fixup,
	.input_mapping = sp_input_mapping,
};
module_hid_driver(sp_driver);

MODULE_DESCRIPTION("HID driver for some sunplus \"special\" devices");
MODULE_LICENSE("GPL");