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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Force feedback support for hid-compliant for some of the devices from4 * Logitech, namely:5 * - WingMan Cordless RumblePad6 * - WingMan Force 3D7 *8 * Copyright (c) 2002-2004 Johann Deneux9 * Copyright (c) 2006 Anssi Hannula <anssi.hannula@gmail.com>10 */11 12/*13 *14 * Should you need to contact me, the author, you can do so by15 * e-mail - mail your message to <johann.deneux@it.uu.se>16 */17 18#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt19 20#include <linux/input.h>21#include <linux/hid.h>22 23#include "hid-lg.h"24 25struct dev_type {26 u16 idVendor;27 u16 idProduct;28 const signed short *ff;29};30 31static const signed short ff_rumble[] = {32 FF_RUMBLE,33 -134};35 36static const signed short ff_joystick[] = {37 FF_CONSTANT,38 -139};40 41static const signed short ff_joystick_ac[] = {42 FF_CONSTANT,43 FF_AUTOCENTER,44 -145};46 47static const struct dev_type devices[] = {48 { 0x046d, 0xc211, ff_rumble },49 { 0x046d, 0xc219, ff_rumble },50 { 0x046d, 0xc283, ff_joystick },51 { 0x046d, 0xc286, ff_joystick_ac },52 { 0x046d, 0xc287, ff_joystick_ac },53 { 0x046d, 0xc293, ff_joystick },54 { 0x046d, 0xc295, ff_joystick },55};56 57static int hid_lgff_play(struct input_dev *dev, void *data, struct ff_effect *effect)58{59 struct hid_device *hid = input_get_drvdata(dev);60 struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;61 struct hid_report *report = list_entry(report_list->next, struct hid_report, list);62 int x, y;63 unsigned int left, right;64 65#define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff66 67 switch (effect->type) {68 case FF_CONSTANT:69 x = effect->u.ramp.start_level + 0x7f; /* 0x7f is center */70 y = effect->u.ramp.end_level + 0x7f;71 CLAMP(x);72 CLAMP(y);73 report->field[0]->value[0] = 0x51;74 report->field[0]->value[1] = 0x08;75 report->field[0]->value[2] = x;76 report->field[0]->value[3] = y;77 dbg_hid("(x, y)=(%04x, %04x)\n", x, y);78 hid_hw_request(hid, report, HID_REQ_SET_REPORT);79 break;80 81 case FF_RUMBLE:82 right = effect->u.rumble.strong_magnitude;83 left = effect->u.rumble.weak_magnitude;84 right = right * 0xff / 0xffff;85 left = left * 0xff / 0xffff;86 CLAMP(left);87 CLAMP(right);88 report->field[0]->value[0] = 0x42;89 report->field[0]->value[1] = 0x00;90 report->field[0]->value[2] = left;91 report->field[0]->value[3] = right;92 dbg_hid("(left, right)=(%04x, %04x)\n", left, right);93 hid_hw_request(hid, report, HID_REQ_SET_REPORT);94 break;95 }96 return 0;97}98 99static void hid_lgff_set_autocenter(struct input_dev *dev, u16 magnitude)100{101 struct hid_device *hid = input_get_drvdata(dev);102 struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;103 struct hid_report *report = list_entry(report_list->next, struct hid_report, list);104 __s32 *value = report->field[0]->value;105 magnitude = (magnitude >> 12) & 0xf;106 *value++ = 0xfe;107 *value++ = 0x0d;108 *value++ = magnitude; /* clockwise strength */109 *value++ = magnitude; /* counter-clockwise strength */110 *value++ = 0x80;111 *value++ = 0x00;112 *value = 0x00;113 hid_hw_request(hid, report, HID_REQ_SET_REPORT);114}115 116int lgff_init(struct hid_device* hid)117{118 struct hid_input *hidinput;119 struct input_dev *dev;120 const signed short *ff_bits = ff_joystick;121 int error;122 int i;123 124 if (list_empty(&hid->inputs)) {125 hid_err(hid, "no inputs found\n");126 return -ENODEV;127 }128 hidinput = list_entry(hid->inputs.next, struct hid_input, list);129 dev = hidinput->input;130 131 /* Check that the report looks ok */132 if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))133 return -ENODEV;134 135 for (i = 0; i < ARRAY_SIZE(devices); i++) {136 if (dev->id.vendor == devices[i].idVendor &&137 dev->id.product == devices[i].idProduct) {138 ff_bits = devices[i].ff;139 break;140 }141 }142 143 for (i = 0; ff_bits[i] >= 0; i++)144 set_bit(ff_bits[i], dev->ffbit);145 146 error = input_ff_create_memless(dev, NULL, hid_lgff_play);147 if (error)148 return error;149 150 if ( test_bit(FF_AUTOCENTER, dev->ffbit) )151 dev->ff->set_autocenter = hid_lgff_set_autocenter;152 153 pr_info("Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n");154 155 return 0;156}157