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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/drivers/hid/hid-gembird.c
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// SPDX-License-Identifier: GPL-2.0-or-later

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/*

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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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 */

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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 const __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 <[email protected]>");

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MODULE_DESCRIPTION("HID Gembird joypad driver");

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MODULE_LICENSE("GPL");

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