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 | |
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(hdev: hid, report, reqtype: 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(hdev: hid, report, reqtype: HID_REQ_SET_REPORT); |
94 | break; |
95 | } |
96 | return 0; |
97 | } |
98 | |
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(hdev: hid, report, reqtype: HID_REQ_SET_REPORT); |
114 | } |
115 | |
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(head: &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, type: HID_OUTPUT_REPORT, id: 0, field_index: 0, report_counts: 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(nr: ff_bits[i], addr: dev->ffbit); |
145 | |
146 | error = input_ff_create_memless(dev, NULL, play_effect: 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 | |