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 
25 struct dev_type {
26 	u16 idVendor;
27 	u16 idProduct;
28 	const signed short *ff;
29 };
30 
31 static const signed short ff_rumble[] = {
32 	FF_RUMBLE,
33 	-1
34 };
35 
36 static const signed short ff_joystick[] = {
37 	FF_CONSTANT,
38 	-1
39 };
40 
41 static const signed short ff_joystick_ac[] = {
42 	FF_CONSTANT,
43 	FF_AUTOCENTER,
44 	-1
45 };
46 
47 static 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 
hid_lgff_play(struct input_dev * dev,void * data,struct ff_effect * effect)57 static 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 
hid_lgff_set_autocenter(struct input_dev * dev,u16 magnitude)99 static 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 
lgff_init(struct hid_device * hid)116 int 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