cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

hid-lgff.c (4079B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Force feedback support for hid-compliant for some of the devices from
      4 * Logitech, namely:
      5 * - WingMan Cordless RumblePad
      6 * - WingMan Force 3D
      7 *
      8 *  Copyright (c) 2002-2004 Johann Deneux
      9 *  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 by
     15 * e-mail - mail your message to <johann.deneux@it.uu.se>
     16 */
     17
     18#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
     19
     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	-1
     34};
     35
     36static const signed short ff_joystick[] = {
     37	FF_CONSTANT,
     38	-1
     39};
     40
     41static const signed short ff_joystick_ac[] = {
     42	FF_CONSTANT,
     43	FF_AUTOCENTER,
     44	-1
     45};
     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 = 0xff
     66
     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}