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hid-gembird.c
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hid-gembird.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* HID driver for Gembird Joypad, "PC Game Controller"
*
* Copyright (c) 2015 Red Hat, Inc
* Copyright (c) 2015 Benjamin Tissoires
*/
/*
*/
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>
#include "hid-ids.h"
#define GEMBIRD_START_FAULTY_RDESC 8
static const __u8 gembird_jpd_faulty_rdesc[] = {
0x75, 0x08, /* Report Size (8) */
0x95, 0x05, /* Report Count (5) */
0x15, 0x00, /* Logical Minimum (0) */
0x26, 0xff, 0x00, /* Logical Maximum (255) */
0x35, 0x00, /* Physical Minimum (0) */
0x46, 0xff, 0x00, /* Physical Maximum (255) */
0x09, 0x30, /* Usage (X) */
0x09, 0x31, /* Usage (Y) */
0x09, 0x32, /* Usage (Z) */
0x09, 0x32, /* Usage (Z) */
0x09, 0x35, /* Usage (Rz) */
0x81, 0x02, /* Input (Data,Var,Abs) */
};
/*
* we fix the report descriptor by:
* - marking the first Z axis as constant (so it is ignored by HID)
* - assign the original second Z to Rx
* - assign the original Rz to Ry
*/
static const __u8 gembird_jpd_fixed_rdesc[] = {
0x75, 0x08, /* Report Size (8) */
0x95, 0x02, /* Report Count (2) */
0x15, 0x00, /* Logical Minimum (0) */
0x26, 0xff, 0x00, /* Logical Maximum (255) */
0x35, 0x00, /* Physical Minimum (0) */
0x46, 0xff, 0x00, /* Physical Maximum (255) */
0x09, 0x30, /* Usage (X) */
0x09, 0x31, /* Usage (Y) */
0x81, 0x02, /* Input (Data,Var,Abs) */
0x95, 0x01, /* Report Count (1) */
0x09, 0x32, /* Usage (Z) */
0x81, 0x01, /* Input (Cnst,Arr,Abs) */
0x95, 0x02, /* Report Count (2) */
0x09, 0x33, /* Usage (Rx) */
0x09, 0x34, /* Usage (Ry) */
0x81, 0x02, /* Input (Data,Var,Abs) */
};
static __u8 *gembird_report_fixup(struct hid_device *hdev, __u8 *rdesc,
unsigned int *rsize)
{
__u8 *new_rdesc;
/* delta_size is > 0 */
size_t delta_size = sizeof(gembird_jpd_fixed_rdesc) -
sizeof(gembird_jpd_faulty_rdesc);
size_t new_size = *rsize + delta_size;
if (*rsize >= 31 && !memcmp(&rdesc[GEMBIRD_START_FAULTY_RDESC],
gembird_jpd_faulty_rdesc,
sizeof(gembird_jpd_faulty_rdesc))) {
new_rdesc = devm_kzalloc(&hdev->dev, new_size, GFP_KERNEL);
if (new_rdesc == NULL)
return rdesc;
dev_info(&hdev->dev,
"fixing Gembird JPD-DualForce 2 report descriptor.\n");
/* start by copying the end of the rdesc */
memcpy(new_rdesc + delta_size, rdesc, *rsize);
/* add the correct beginning */
memcpy(new_rdesc, rdesc, GEMBIRD_START_FAULTY_RDESC);
/* replace the faulty part with the fixed one */
memcpy(new_rdesc + GEMBIRD_START_FAULTY_RDESC,
gembird_jpd_fixed_rdesc,
sizeof(gembird_jpd_fixed_rdesc));
*rsize = new_size;
rdesc = new_rdesc;
}
return rdesc;
}
static const struct hid_device_id gembird_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_GEMBIRD,
USB_DEVICE_ID_GEMBIRD_JPD_DUALFORCE2) },
{ }
};
MODULE_DEVICE_TABLE(hid, gembird_devices);
static struct hid_driver gembird_driver = {
.name = "gembird",
.id_table = gembird_devices,
.report_fixup = gembird_report_fixup,
};
module_hid_driver(gembird_driver);
MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
MODULE_DESCRIPTION("HID Gembird joypad driver");
MODULE_LICENSE("GPL");