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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Force feedback support for ACRUX game controllers4 *5 * From what I have gathered, these devices are mass produced in China6 * by several vendors. They often share the same design as the original7 * Xbox 360 controller.8 *9 * 1a34:0802 "ACRUX USB GAMEPAD 8116"10 * - tested with an EXEQ EQ-PCU-02090 game controller.11 *12 * Copyright (c) 2010 Sergei Kolzun <x0r@dv-life.ru>13 */14 15/*16 */17 18#include <linux/input.h>19#include <linux/slab.h>20#include <linux/hid.h>21#include <linux/module.h>22 23#include "hid-ids.h"24 25#ifdef CONFIG_HID_ACRUX_FF26 27struct axff_device {28 struct hid_report *report;29};30 31static int axff_play(struct input_dev *dev, void *data, struct ff_effect *effect)32{33 struct hid_device *hid = input_get_drvdata(dev);34 struct axff_device *axff = data;35 struct hid_report *report = axff->report;36 int field_count = 0;37 int left, right;38 int i, j;39 40 left = effect->u.rumble.strong_magnitude;41 right = effect->u.rumble.weak_magnitude;42 43 dbg_hid("called with 0x%04x 0x%04x", left, right);44 45 left = left * 0xff / 0xffff;46 right = right * 0xff / 0xffff;47 48 for (i = 0; i < report->maxfield; i++) {49 for (j = 0; j < report->field[i]->report_count; j++) {50 report->field[i]->value[j] =51 field_count % 2 ? right : left;52 field_count++;53 }54 }55 56 dbg_hid("running with 0x%02x 0x%02x", left, right);57 hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT);58 59 return 0;60}61 62static int axff_init(struct hid_device *hid)63{64 struct axff_device *axff;65 struct hid_report *report;66 struct hid_input *hidinput;67 struct list_head *report_list =&hid->report_enum[HID_OUTPUT_REPORT].report_list;68 struct input_dev *dev;69 int field_count = 0;70 int i, j;71 int error;72 73 if (list_empty(&hid->inputs)) {74 hid_err(hid, "no inputs found\n");75 return -ENODEV;76 }77 hidinput = list_first_entry(&hid->inputs, struct hid_input, list);78 dev = hidinput->input;79 80 if (list_empty(report_list)) {81 hid_err(hid, "no output reports found\n");82 return -ENODEV;83 }84 85 report = list_first_entry(report_list, struct hid_report, list);86 for (i = 0; i < report->maxfield; i++) {87 for (j = 0; j < report->field[i]->report_count; j++) {88 report->field[i]->value[j] = 0x00;89 field_count++;90 }91 }92 93 if (field_count < 4 && hid->product != 0xf705) {94 hid_err(hid, "not enough fields in the report: %d\n",95 field_count);96 return -ENODEV;97 }98 99 axff = kzalloc(sizeof(struct axff_device), GFP_KERNEL);100 if (!axff)101 return -ENOMEM;102 103 set_bit(FF_RUMBLE, dev->ffbit);104 105 error = input_ff_create_memless(dev, axff, axff_play);106 if (error)107 goto err_free_mem;108 109 axff->report = report;110 hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT);111 112 hid_info(hid, "Force Feedback for ACRUX game controllers by Sergei Kolzun <x0r@dv-life.ru>\n");113 114 return 0;115 116err_free_mem:117 kfree(axff);118 return error;119}120#else121static inline int axff_init(struct hid_device *hid)122{123 return 0;124}125#endif126 127static int ax_probe(struct hid_device *hdev, const struct hid_device_id *id)128{129 int error;130 131 dev_dbg(&hdev->dev, "ACRUX HID hardware probe...\n");132 133 error = hid_parse(hdev);134 if (error) {135 hid_err(hdev, "parse failed\n");136 return error;137 }138 139 error = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);140 if (error) {141 hid_err(hdev, "hw start failed\n");142 return error;143 }144 145 error = axff_init(hdev);146 if (error) {147 /*148 * Do not fail device initialization completely as device149 * may still be partially operable, just warn.150 */151 hid_warn(hdev,152 "Failed to enable force feedback support, error: %d\n",153 error);154 }155 156 /*157 * We need to start polling device right away, otherwise158 * it will go into a coma.159 */160 error = hid_hw_open(hdev);161 if (error) {162 dev_err(&hdev->dev, "hw open failed\n");163 hid_hw_stop(hdev);164 return error;165 }166 167 return 0;168}169 170static void ax_remove(struct hid_device *hdev)171{172 hid_hw_close(hdev);173 hid_hw_stop(hdev);174}175 176static const struct hid_device_id ax_devices[] = {177 { HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0x0802), },178 { HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0xf705), },179 { }180};181MODULE_DEVICE_TABLE(hid, ax_devices);182 183static struct hid_driver ax_driver = {184 .name = "acrux",185 .id_table = ax_devices,186 .probe = ax_probe,187 .remove = ax_remove,188};189module_hid_driver(ax_driver);190 191MODULE_AUTHOR("Sergei Kolzun");192MODULE_DESCRIPTION("Force feedback support for ACRUX game controllers");193MODULE_LICENSE("GPL");194