// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Force feedback support for hid-compliant for some of the devices from
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* Logitech, namely:
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* - WingMan Cordless RumblePad
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* - WingMan Force 3D
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*
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* Copyright (c) 2002-2004 Johann Deneux
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* Copyright (c) 2006 Anssi Hannula <anssi.hannula@gmail.com>
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*/
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/*
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*
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* Should you need to contact me, the author, you can do so by
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* e-mail - mail your message to <johann.deneux@it.uu.se>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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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struct dev_type {
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u16 idVendor;
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u16 idProduct;
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const signed short *ff;
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};
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static const signed short ff_rumble[] = {
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FF_RUMBLE,
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-1
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};
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static const signed short ff_joystick[] = {
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FF_CONSTANT,
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-1
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};
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static const signed short ff_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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static const struct dev_type devices[] = {
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{ 0x046d, 0xc211, ff_rumble },
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{ 0x046d, 0xc219, ff_rumble },
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{ 0x046d, 0xc283, ff_joystick },
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{ 0x046d, 0xc286, ff_joystick_ac },
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{ 0x046d, 0xc287, ff_joystick_ac },
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{ 0x046d, 0xc293, ff_joystick },
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{ 0x046d, 0xc295, ff_joystick },
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};
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static int hid_lgff_play(struct input_dev *dev, void *data, 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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unsigned int left, right;
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#define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
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switch (effect->type) {
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case FF_CONSTANT:
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x = effect->u.ramp.start_level + 0x7f; /* 0x7f is center */
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y = effect->u.ramp.end_level + 0x7f;
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CLAMP(x);
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CLAMP(y);
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report->field[0]->value[0] = 0x51;
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report->field[0]->value[1] = 0x08;
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report->field[0]->value[2] = x;
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report->field[0]->value[3] = y;
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dbg_hid("(x, y)=(%04x, %04x)\n", x, y);
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hid_hw_request(hid, report, HID_REQ_SET_REPORT);
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break;
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case FF_RUMBLE:
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right = effect->u.rumble.strong_magnitude;
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left = effect->u.rumble.weak_magnitude;
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right = right * 0xff / 0xffff;
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left = left * 0xff / 0xffff;
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CLAMP(left);
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CLAMP(right);
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report->field[0]->value[0] = 0x42;
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report->field[0]->value[1] = 0x00;
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report->field[0]->value[2] = left;
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report->field[0]->value[3] = right;
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dbg_hid("(left, right)=(%04x, %04x)\n", left, right);
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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_lgff_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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__s32 *value = report->field[0]->value;
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magnitude = (magnitude >> 12) & 0xf;
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*value++ = 0xfe;
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*value++ = 0x0d;
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*value++ = magnitude; /* clockwise strength */
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*value++ = magnitude; /* counter-clockwise strength */
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*value++ = 0x80;
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*value++ = 0x00;
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*value = 0x00;
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hid_hw_request(hid, report, HID_REQ_SET_REPORT);
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}
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int lgff_init(struct hid_device* hid)
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{
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struct hid_input *hidinput;
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struct input_dev *dev;
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const signed short *ff_bits = ff_joystick;
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int error;
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int i;
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if (list_empty(&hid->inputs)) {
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hid_err(hid, "no inputs found\n");
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return -ENODEV;
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}
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hidinput = list_entry(hid->inputs.next, struct hid_input, list);
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dev = hidinput->input;
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/* Check that the report looks ok */
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if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))
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return -ENODEV;
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for (i = 0; i < ARRAY_SIZE(devices); i++) {
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if (dev->id.vendor == devices[i].idVendor &&
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dev->id.product == devices[i].idProduct) {
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ff_bits = devices[i].ff;
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break;
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}
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}
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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_lgff_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_lgff_set_autocenter;
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pr_info("Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n");
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return 0;
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}
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