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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>
144 lines
3.7 KiB
C
144 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Force feedback support for Logitech Flight System G940
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*
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* Copyright (c) 2009 Gary Stein <LordCnidarian@gmail.com>
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*/
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/*
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*/
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#include <linux/input.h>
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#include <linux/hid.h>
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#include "hid-lg.h"
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/*
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* G940 Theory of Operation (from experimentation)
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*
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* There are 63 fields (only 3 of them currently used)
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* 0 - seems to be command field
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* 1 - 30 deal with the x axis
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* 31 -60 deal with the y axis
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*
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* Field 1 is x axis constant force
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* Field 31 is y axis constant force
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*
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* other interesting fields 1,2,3,4 on x axis
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* (same for 31,32,33,34 on y axis)
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*
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* 0 0 127 127 makes the joystick autocenter hard
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*
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* 127 0 127 127 makes the joystick loose on the right,
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* but stops all movemnt left
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*
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* -127 0 -127 -127 makes the joystick loose on the left,
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* but stops all movement right
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*
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* 0 0 -127 -127 makes the joystick rattle very hard
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*
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* I'm sure these are effects that I don't know enough about them
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*/
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struct lg3ff_device {
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struct hid_report *report;
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};
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static int hid_lg3ff_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 list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
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struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
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int x, y;
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/*
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* Available values in the field should always be 63, but we only use up to
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* 35. Instead, clear the entire area, however big it is.
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*/
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memset(report->field[0]->value, 0,
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sizeof(__s32) * report->field[0]->report_count);
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switch (effect->type) {
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case FF_CONSTANT:
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/*
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* Already clamped in ff_memless
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* 0 is center (different then other logitech)
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*/
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x = effect->u.ramp.start_level;
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y = effect->u.ramp.end_level;
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/* send command byte */
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report->field[0]->value[0] = 0x51;
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/*
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* Sign backwards from other Force3d pro
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* which get recast here in two's complement 8 bits
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*/
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report->field[0]->value[1] = (unsigned char)(-x);
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report->field[0]->value[31] = (unsigned char)(-y);
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hid_hw_request(hid, report, HID_REQ_SET_REPORT);
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break;
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}
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return 0;
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}
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static void hid_lg3ff_set_autocenter(struct input_dev *dev, u16 magnitude)
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{
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struct hid_device *hid = input_get_drvdata(dev);
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struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
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struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
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/*
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* Auto Centering probed from device
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* NOTE: deadman's switch on G940 must be covered
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* for effects to work
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*/
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report->field[0]->value[0] = 0x51;
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report->field[0]->value[1] = 0x00;
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report->field[0]->value[2] = 0x00;
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report->field[0]->value[3] = 0x7F;
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report->field[0]->value[4] = 0x7F;
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report->field[0]->value[31] = 0x00;
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report->field[0]->value[32] = 0x00;
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report->field[0]->value[33] = 0x7F;
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report->field[0]->value[34] = 0x7F;
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hid_hw_request(hid, report, HID_REQ_SET_REPORT);
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}
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static const signed short ff3_joystick_ac[] = {
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FF_CONSTANT,
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FF_AUTOCENTER,
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-1
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};
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int lg3ff_init(struct hid_device *hid)
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{
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struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
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struct input_dev *dev = hidinput->input;
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const signed short *ff_bits = ff3_joystick_ac;
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int error;
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int i;
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/* Check that the report looks ok */
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if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 35))
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return -ENODEV;
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/* Assume single fixed device G940 */
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for (i = 0; ff_bits[i] >= 0; i++)
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set_bit(ff_bits[i], dev->ffbit);
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error = input_ff_create_memless(dev, NULL, hid_lg3ff_play);
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if (error)
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return error;
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if (test_bit(FF_AUTOCENTER, dev->ffbit))
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dev->ff->set_autocenter = hid_lg3ff_set_autocenter;
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hid_info(hid, "Force feedback for Logitech Flight System G940 by Gary Stein <LordCnidarian@gmail.com>\n");
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return 0;
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}
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