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