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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * HID driver for Gembird Joypad, "PC Game Controller"4 *5 * Copyright (c) 2015 Red Hat, Inc6 * Copyright (c) 2015 Benjamin Tissoires7 */8 9/*10 */11 12#include <linux/device.h>13#include <linux/hid.h>14#include <linux/module.h>15 16#include "hid-ids.h"17 18#define GEMBIRD_START_FAULTY_RDESC 819 20static const __u8 gembird_jpd_faulty_rdesc[] = {21 0x75, 0x08, /* Report Size (8) */22 0x95, 0x05, /* Report Count (5) */23 0x15, 0x00, /* Logical Minimum (0) */24 0x26, 0xff, 0x00, /* Logical Maximum (255) */25 0x35, 0x00, /* Physical Minimum (0) */26 0x46, 0xff, 0x00, /* Physical Maximum (255) */27 0x09, 0x30, /* Usage (X) */28 0x09, 0x31, /* Usage (Y) */29 0x09, 0x32, /* Usage (Z) */30 0x09, 0x32, /* Usage (Z) */31 0x09, 0x35, /* Usage (Rz) */32 0x81, 0x02, /* Input (Data,Var,Abs) */33};34 35/*36 * we fix the report descriptor by:37 * - marking the first Z axis as constant (so it is ignored by HID)38 * - assign the original second Z to Rx39 * - assign the original Rz to Ry40 */41static const __u8 gembird_jpd_fixed_rdesc[] = {42 0x75, 0x08, /* Report Size (8) */43 0x95, 0x02, /* Report Count (2) */44 0x15, 0x00, /* Logical Minimum (0) */45 0x26, 0xff, 0x00, /* Logical Maximum (255) */46 0x35, 0x00, /* Physical Minimum (0) */47 0x46, 0xff, 0x00, /* Physical Maximum (255) */48 0x09, 0x30, /* Usage (X) */49 0x09, 0x31, /* Usage (Y) */50 0x81, 0x02, /* Input (Data,Var,Abs) */51 0x95, 0x01, /* Report Count (1) */52 0x09, 0x32, /* Usage (Z) */53 0x81, 0x01, /* Input (Cnst,Arr,Abs) */54 0x95, 0x02, /* Report Count (2) */55 0x09, 0x33, /* Usage (Rx) */56 0x09, 0x34, /* Usage (Ry) */57 0x81, 0x02, /* Input (Data,Var,Abs) */58};59 60static const __u8 *gembird_report_fixup(struct hid_device *hdev, __u8 *rdesc,61 unsigned int *rsize)62{63 __u8 *new_rdesc;64 /* delta_size is > 0 */65 size_t delta_size = sizeof(gembird_jpd_fixed_rdesc) -66 sizeof(gembird_jpd_faulty_rdesc);67 size_t new_size = *rsize + delta_size;68 69 if (*rsize >= 31 && !memcmp(&rdesc[GEMBIRD_START_FAULTY_RDESC],70 gembird_jpd_faulty_rdesc,71 sizeof(gembird_jpd_faulty_rdesc))) {72 new_rdesc = devm_kzalloc(&hdev->dev, new_size, GFP_KERNEL);73 if (new_rdesc == NULL)74 return rdesc;75 76 dev_info(&hdev->dev,77 "fixing Gembird JPD-DualForce 2 report descriptor.\n");78 79 /* start by copying the end of the rdesc */80 memcpy(new_rdesc + delta_size, rdesc, *rsize);81 82 /* add the correct beginning */83 memcpy(new_rdesc, rdesc, GEMBIRD_START_FAULTY_RDESC);84 85 /* replace the faulty part with the fixed one */86 memcpy(new_rdesc + GEMBIRD_START_FAULTY_RDESC,87 gembird_jpd_fixed_rdesc,88 sizeof(gembird_jpd_fixed_rdesc));89 90 *rsize = new_size;91 rdesc = new_rdesc;92 }93 94 return rdesc;95}96 97static const struct hid_device_id gembird_devices[] = {98 { HID_USB_DEVICE(USB_VENDOR_ID_GEMBIRD,99 USB_DEVICE_ID_GEMBIRD_JPD_DUALFORCE2) },100 { }101};102MODULE_DEVICE_TABLE(hid, gembird_devices);103 104static struct hid_driver gembird_driver = {105 .name = "gembird",106 .id_table = gembird_devices,107 .report_fixup = gembird_report_fixup,108};109module_hid_driver(gembird_driver);110 111MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");112MODULE_DESCRIPTION("HID Gembird joypad driver");113MODULE_LICENSE("GPL");114