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1a59d1b8e0
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
143 lines
3.1 KiB
C
143 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Force feedback support for EMS Trio Linker Plus II
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*
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* Copyright (c) 2010 Ignaz Forster <ignaz.forster@gmx.de>
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*/
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/*
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*/
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#include <linux/hid.h>
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#include <linux/input.h>
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#include <linux/module.h>
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#include "hid-ids.h"
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struct emsff_device {
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struct hid_report *report;
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};
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static int emsff_play(struct input_dev *dev, void *data,
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struct ff_effect *effect)
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{
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struct hid_device *hid = input_get_drvdata(dev);
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struct emsff_device *emsff = data;
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int weak, strong;
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weak = effect->u.rumble.weak_magnitude;
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strong = effect->u.rumble.strong_magnitude;
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dbg_hid("called with 0x%04x 0x%04x\n", strong, weak);
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weak = weak * 0xff / 0xffff;
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strong = strong * 0xff / 0xffff;
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emsff->report->field[0]->value[1] = weak;
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emsff->report->field[0]->value[2] = strong;
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dbg_hid("running with 0x%02x 0x%02x\n", strong, weak);
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hid_hw_request(hid, emsff->report, HID_REQ_SET_REPORT);
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return 0;
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}
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static int emsff_init(struct hid_device *hid)
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{
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struct emsff_device *emsff;
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struct hid_report *report;
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struct hid_input *hidinput = list_first_entry(&hid->inputs,
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struct hid_input, list);
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struct list_head *report_list =
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&hid->report_enum[HID_OUTPUT_REPORT].report_list;
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struct input_dev *dev = hidinput->input;
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int error;
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if (list_empty(report_list)) {
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hid_err(hid, "no output reports found\n");
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return -ENODEV;
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}
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report = list_first_entry(report_list, struct hid_report, list);
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if (report->maxfield < 1) {
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hid_err(hid, "no fields in the report\n");
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return -ENODEV;
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}
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if (report->field[0]->report_count < 7) {
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hid_err(hid, "not enough values in the field\n");
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return -ENODEV;
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}
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emsff = kzalloc(sizeof(struct emsff_device), GFP_KERNEL);
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if (!emsff)
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return -ENOMEM;
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set_bit(FF_RUMBLE, dev->ffbit);
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error = input_ff_create_memless(dev, emsff, emsff_play);
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if (error) {
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kfree(emsff);
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return error;
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}
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emsff->report = report;
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emsff->report->field[0]->value[0] = 0x01;
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emsff->report->field[0]->value[1] = 0x00;
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emsff->report->field[0]->value[2] = 0x00;
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emsff->report->field[0]->value[3] = 0x00;
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emsff->report->field[0]->value[4] = 0x00;
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emsff->report->field[0]->value[5] = 0x00;
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emsff->report->field[0]->value[6] = 0x00;
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hid_hw_request(hid, emsff->report, HID_REQ_SET_REPORT);
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hid_info(hid, "force feedback for EMS based devices by Ignaz Forster <ignaz.forster@gmx.de>\n");
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return 0;
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}
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static int ems_probe(struct hid_device *hdev, const struct hid_device_id *id)
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{
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int ret;
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ret = hid_parse(hdev);
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if (ret) {
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hid_err(hdev, "parse failed\n");
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goto err;
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}
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ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
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if (ret) {
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hid_err(hdev, "hw start failed\n");
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goto err;
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}
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ret = emsff_init(hdev);
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if (ret) {
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dev_err(&hdev->dev, "force feedback init failed\n");
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hid_hw_stop(hdev);
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goto err;
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}
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return 0;
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err:
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return ret;
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}
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static const struct hid_device_id ems_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_EMS, USB_DEVICE_ID_EMS_TRIO_LINKER_PLUS_II) },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, ems_devices);
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static struct hid_driver ems_driver = {
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.name = "hkems",
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.id_table = ems_devices,
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.probe = ems_probe,
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};
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module_hid_driver(ems_driver);
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MODULE_LICENSE("GPL");
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