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1// SPDX-License-Identifier: GPL-2.02 3/*4 * HID driver for WinWing Orion 2 throttle5 *6 * Copyright (c) 2023 Ivan Gorinov7 */8 9#include <linux/device.h>10#include <linux/hid.h>11#include <linux/hidraw.h>12#include <linux/kernel.h>13#include <linux/module.h>14#include <linux/mutex.h>15 16#define MAX_REPORT 1617 18struct winwing_led {19 struct led_classdev cdev;20 struct hid_device *hdev;21 int number;22};23 24struct winwing_led_info {25 int number;26 int max_brightness;27 const char *led_name;28};29 30static const struct winwing_led_info led_info[3] = {31 { 0, 255, "backlight" },32 { 1, 1, "a-a" },33 { 2, 1, "a-g" },34};35 36struct winwing_drv_data {37 struct hid_device *hdev;38 __u8 *report_buf;39 struct mutex lock;40 unsigned int num_leds;41 struct winwing_led leds[];42};43 44static int winwing_led_write(struct led_classdev *cdev,45 enum led_brightness br)46{47 struct winwing_led *led = (struct winwing_led *) cdev;48 struct winwing_drv_data *data = hid_get_drvdata(led->hdev);49 __u8 *buf = data->report_buf;50 int ret;51 52 mutex_lock(&data->lock);53 54 buf[0] = 0x02;55 buf[1] = 0x60;56 buf[2] = 0xbe;57 buf[3] = 0x00;58 buf[4] = 0x00;59 buf[5] = 0x03;60 buf[6] = 0x49;61 buf[7] = led->number;62 buf[8] = br;63 buf[9] = 0x00;64 buf[10] = 0;65 buf[11] = 0;66 buf[12] = 0;67 buf[13] = 0;68 69 ret = hid_hw_output_report(led->hdev, buf, 14);70 71 mutex_unlock(&data->lock);72 73 return ret;74}75 76static int winwing_init_led(struct hid_device *hdev,77 struct input_dev *input)78{79 struct winwing_drv_data *data;80 struct winwing_led *led;81 int ret;82 int i;83 84 size_t data_size = struct_size(data, leds, 3);85 86 data = devm_kzalloc(&hdev->dev, data_size, GFP_KERNEL);87 88 if (!data)89 return -ENOMEM;90 91 data->report_buf = devm_kmalloc(&hdev->dev, MAX_REPORT, GFP_KERNEL);92 93 if (!data->report_buf)94 return -ENOMEM;95 96 for (i = 0; i < 3; i += 1) {97 const struct winwing_led_info *info = &led_info[i];98 99 led = &data->leds[i];100 led->hdev = hdev;101 led->number = info->number;102 led->cdev.max_brightness = info->max_brightness;103 led->cdev.brightness_set_blocking = winwing_led_write;104 led->cdev.flags = LED_HW_PLUGGABLE;105 led->cdev.name = devm_kasprintf(&hdev->dev, GFP_KERNEL,106 "%s::%s",107 dev_name(&input->dev),108 info->led_name);109 110 ret = devm_led_classdev_register(&hdev->dev, &led->cdev);111 if (ret)112 return ret;113 }114 115 hid_set_drvdata(hdev, data);116 117 return ret;118}119 120static int winwing_probe(struct hid_device *hdev,121 const struct hid_device_id *id)122{123 int ret;124 125 ret = hid_parse(hdev);126 if (ret) {127 hid_err(hdev, "parse failed\n");128 return ret;129 }130 131 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);132 if (ret) {133 hid_err(hdev, "hw start failed\n");134 return ret;135 }136 137 return 0;138}139 140static int winwing_input_configured(struct hid_device *hdev,141 struct hid_input *hidinput)142{143 int ret;144 145 ret = winwing_init_led(hdev, hidinput->input);146 147 if (ret)148 hid_err(hdev, "led init failed\n");149 150 return ret;151}152 153static const __u8 original_rdesc_buttons[] = {154 0x05, 0x09, 0x19, 0x01, 0x29, 0x6F,155 0x15, 0x00, 0x25, 0x01, 0x35, 0x00,156 0x45, 0x01, 0x75, 0x01, 0x95, 0x6F,157 0x81, 0x02, 0x75, 0x01, 0x95, 0x01,158 0x81, 0x01159};160 161/*162 * HID report descriptor shows 111 buttons, which exceeds maximum163 * number of buttons (80) supported by Linux kernel HID subsystem.164 *165 * This module skips numbers 32-63, unused on some throttle grips.166 */167 168static const __u8 *winwing_report_fixup(struct hid_device *hdev, __u8 *rdesc,169 unsigned int *rsize)170{171 int sig_length = sizeof(original_rdesc_buttons);172 int unused_button_numbers = 32;173 174 if (*rsize < 34)175 return rdesc;176 177 if (memcmp(rdesc + 8, original_rdesc_buttons, sig_length) == 0) {178 179 /* Usage Maximum */180 rdesc[13] -= unused_button_numbers;181 182 /* Report Count for buttons */183 rdesc[25] -= unused_button_numbers;184 185 /* Report Count for padding [HID1_11, 6.2.2.9] */186 rdesc[31] += unused_button_numbers;187 188 hid_info(hdev, "winwing descriptor fixed\n");189 }190 191 return rdesc;192}193 194static int winwing_raw_event(struct hid_device *hdev,195 struct hid_report *report, u8 *raw_data, int size)196{197 if (size >= 15) {198 /* Skip buttons 32 .. 63 */199 memmove(raw_data + 5, raw_data + 9, 6);200 201 /* Clear the padding */202 memset(raw_data + 11, 0, 4);203 }204 205 return 0;206}207 208static const struct hid_device_id winwing_devices[] = {209 { HID_USB_DEVICE(0x4098, 0xbe62) }, /* TGRIP-18 */210 { HID_USB_DEVICE(0x4098, 0xbe68) }, /* TGRIP-16EX */211 {}212};213 214MODULE_DEVICE_TABLE(hid, winwing_devices);215 216static struct hid_driver winwing_driver = {217 .name = "winwing",218 .id_table = winwing_devices,219 .probe = winwing_probe,220 .input_configured = winwing_input_configured,221 .report_fixup = winwing_report_fixup,222 .raw_event = winwing_raw_event,223};224module_hid_driver(winwing_driver);225 226MODULE_DESCRIPTION("HID driver for WinWing Orion 2 throttle");227MODULE_LICENSE("GPL");228