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// SPDX-License-Identifier: GPL-2.0
/*
* HID driver for WinWing Orion 2 throttle
*
* Copyright (c) 2023 Ivan Gorinov
*/
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/hidraw.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#define MAX_REPORT 16
struct winwing_led {
struct led_classdev cdev;
struct hid_device *hdev;
int number;
};
struct winwing_led_info {
int number;
int max_brightness;
const char *led_name;
};
static struct winwing_led_info led_info[3] = {
{ 0, 255, "backlight" },
{ 1, 1, "a-a" },
{ 2, 1, "a-g" },
};
struct winwing_drv_data {
struct hid_device *hdev;
__u8 *report_buf;
struct mutex lock;
unsigned int num_leds;
struct winwing_led leds[];
};
static int winwing_led_write(struct led_classdev *cdev,
enum led_brightness br)
{
struct winwing_led *led = (struct winwing_led *) cdev;
struct winwing_drv_data *data = hid_get_drvdata(led->hdev);
__u8 *buf = data->report_buf;
int ret;
mutex_lock(&data->lock);
buf[0] = 0x02;
buf[1] = 0x60;
buf[2] = 0xbe;
buf[3] = 0x00;
buf[4] = 0x00;
buf[5] = 0x03;
buf[6] = 0x49;
buf[7] = led->number;
buf[8] = br;
buf[9] = 0x00;
buf[10] = 0;
buf[11] = 0;
buf[12] = 0;
buf[13] = 0;
ret = hid_hw_output_report(led->hdev, buf, 14);
mutex_unlock(&data->lock);
return ret;
}
static int winwing_init_led(struct hid_device *hdev,
struct input_dev *input)
{
struct winwing_drv_data *data;
struct winwing_led *led;
int ret;
int i;
size_t data_size = struct_size(data, leds, 3);
data = devm_kzalloc(&hdev->dev, data_size, GFP_KERNEL);
if (!data)
return -ENOMEM;
data->report_buf = devm_kmalloc(&hdev->dev, MAX_REPORT, GFP_KERNEL);
if (!data->report_buf)
return -ENOMEM;
for (i = 0; i < 3; i += 1) {
struct winwing_led_info *info = &led_info[i];
led = &data->leds[i];
led->hdev = hdev;
led->number = info->number;
led->cdev.max_brightness = info->max_brightness;
led->cdev.brightness_set_blocking = winwing_led_write;
led->cdev.flags = LED_HW_PLUGGABLE;
led->cdev.name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
"%s::%s",
dev_name(&input->dev),
info->led_name);
ret = devm_led_classdev_register(&hdev->dev, &led->cdev);
if (ret)
return ret;
}
hid_set_drvdata(hdev, data);
return ret;
}
static int winwing_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
int ret;
ret = hid_parse(hdev);
if (ret) {
hid_err(hdev, "parse failed\n");
return ret;
}
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
if (ret) {
hid_err(hdev, "hw start failed\n");
return ret;
}
return 0;
}
static int winwing_input_configured(struct hid_device *hdev,
struct hid_input *hidinput)
{
int ret;
ret = winwing_init_led(hdev, hidinput->input);
if (ret)
hid_err(hdev, "led init failed\n");
return ret;
}
static __u8 original_rdesc_buttons[] = {
0x05, 0x09, 0x19, 0x01, 0x29, 0x6F,
0x15, 0x00, 0x25, 0x01, 0x35, 0x00,
0x45, 0x01, 0x75, 0x01, 0x95, 0x6F,
0x81, 0x02, 0x75, 0x01, 0x95, 0x01,
0x81, 0x01
};
/*
* HID report descriptor shows 111 buttons, which exceeds maximum
* number of buttons (80) supported by Linux kernel HID subsystem.
*
* This module skips numbers 32-63, unused on some throttle grips.
*/
static __u8 *winwing_report_fixup(struct hid_device *hdev, __u8 *rdesc,
unsigned int *rsize)
{
int sig_length = sizeof(original_rdesc_buttons);
int unused_button_numbers = 32;
if (*rsize < 34)
return rdesc;
if (memcmp(rdesc + 8, original_rdesc_buttons, sig_length) == 0) {
/* Usage Maximum */
rdesc[13] -= unused_button_numbers;
/* Report Count for buttons */
rdesc[25] -= unused_button_numbers;
/* Report Count for padding [HID1_11, 6.2.2.9] */
rdesc[31] += unused_button_numbers;
hid_info(hdev, "winwing descriptor fixed\n");
}
return rdesc;
}
static int winwing_raw_event(struct hid_device *hdev,
struct hid_report *report, u8 *raw_data, int size)
{
if (size >= 15) {
/* Skip buttons 32 .. 63 */
memmove(raw_data + 5, raw_data + 9, 6);
/* Clear the padding */
memset(raw_data + 11, 0, 4);
}
return 0;
}
static const struct hid_device_id winwing_devices[] = {
{ HID_USB_DEVICE(0x4098, 0xbe62) }, /* TGRIP-18 */
{ HID_USB_DEVICE(0x4098, 0xbe68) }, /* TGRIP-16EX */
{}
};
MODULE_DEVICE_TABLE(hid, winwing_devices);
static struct hid_driver winwing_driver = {
.name = "winwing",
.id_table = winwing_devices,
.probe = winwing_probe,
.input_configured = winwing_input_configured,
.report_fixup = winwing_report_fixup,
.raw_event = winwing_raw_event,
};
module_hid_driver(winwing_driver);
MODULE_DESCRIPTION("HID driver for WinWing Orion 2 throttle");
MODULE_LICENSE("GPL");
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