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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
74f292ca GS |
2 | /* |
3 | * Force feedback support for Logitech Flight System G940 | |
4 | * | |
5 | * Copyright (c) 2009 Gary Stein <LordCnidarian@gmail.com> | |
6 | */ | |
7 | ||
8 | /* | |
74f292ca GS |
9 | */ |
10 | ||
11 | ||
12 | #include <linux/input.h> | |
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13 | #include <linux/hid.h> |
14 | ||
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15 | #include "hid-lg.h" |
16 | ||
17 | /* | |
18 | * G940 Theory of Operation (from experimentation) | |
19 | * | |
20 | * There are 63 fields (only 3 of them currently used) | |
21 | * 0 - seems to be command field | |
22 | * 1 - 30 deal with the x axis | |
23 | * 31 -60 deal with the y axis | |
24 | * | |
25 | * Field 1 is x axis constant force | |
26 | * Field 31 is y axis constant force | |
27 | * | |
28 | * other interesting fields 1,2,3,4 on x axis | |
29 | * (same for 31,32,33,34 on y axis) | |
30 | * | |
31 | * 0 0 127 127 makes the joystick autocenter hard | |
32 | * | |
33 | * 127 0 127 127 makes the joystick loose on the right, | |
34 | * but stops all movemnt left | |
35 | * | |
36 | * -127 0 -127 -127 makes the joystick loose on the left, | |
37 | * but stops all movement right | |
38 | * | |
39 | * 0 0 -127 -127 makes the joystick rattle very hard | |
40 | * | |
41 | * I'm sure these are effects that I don't know enough about them | |
42 | */ | |
43 | ||
44 | struct lg3ff_device { | |
45 | struct hid_report *report; | |
46 | }; | |
47 | ||
48 | static int hid_lg3ff_play(struct input_dev *dev, void *data, | |
49 | struct ff_effect *effect) | |
50 | { | |
51 | struct hid_device *hid = input_get_drvdata(dev); | |
52 | struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; | |
53 | struct hid_report *report = list_entry(report_list->next, struct hid_report, list); | |
54 | int x, y; | |
55 | ||
56 | /* | |
0fb6bd06 KC |
57 | * Available values in the field should always be 63, but we only use up to |
58 | * 35. Instead, clear the entire area, however big it is. | |
74f292ca | 59 | */ |
0fb6bd06 KC |
60 | memset(report->field[0]->value, 0, |
61 | sizeof(__s32) * report->field[0]->report_count); | |
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62 | |
63 | switch (effect->type) { | |
64 | case FF_CONSTANT: | |
65 | /* | |
66 | * Already clamped in ff_memless | |
67 | * 0 is center (different then other logitech) | |
68 | */ | |
69 | x = effect->u.ramp.start_level; | |
70 | y = effect->u.ramp.end_level; | |
71 | ||
72 | /* send command byte */ | |
73 | report->field[0]->value[0] = 0x51; | |
74 | ||
75 | /* | |
76 | * Sign backwards from other Force3d pro | |
77 | * which get recast here in two's complement 8 bits | |
78 | */ | |
79 | report->field[0]->value[1] = (unsigned char)(-x); | |
80 | report->field[0]->value[31] = (unsigned char)(-y); | |
81 | ||
d8814272 | 82 | hid_hw_request(hid, report, HID_REQ_SET_REPORT); |
74f292ca GS |
83 | break; |
84 | } | |
85 | return 0; | |
86 | } | |
87 | static void hid_lg3ff_set_autocenter(struct input_dev *dev, u16 magnitude) | |
88 | { | |
89 | struct hid_device *hid = input_get_drvdata(dev); | |
90 | struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; | |
91 | struct hid_report *report = list_entry(report_list->next, struct hid_report, list); | |
92 | ||
93 | /* | |
94 | * Auto Centering probed from device | |
95 | * NOTE: deadman's switch on G940 must be covered | |
96 | * for effects to work | |
97 | */ | |
98 | report->field[0]->value[0] = 0x51; | |
99 | report->field[0]->value[1] = 0x00; | |
100 | report->field[0]->value[2] = 0x00; | |
101 | report->field[0]->value[3] = 0x7F; | |
102 | report->field[0]->value[4] = 0x7F; | |
103 | report->field[0]->value[31] = 0x00; | |
104 | report->field[0]->value[32] = 0x00; | |
105 | report->field[0]->value[33] = 0x7F; | |
106 | report->field[0]->value[34] = 0x7F; | |
107 | ||
d8814272 | 108 | hid_hw_request(hid, report, HID_REQ_SET_REPORT); |
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109 | } |
110 | ||
111 | ||
112 | static const signed short ff3_joystick_ac[] = { | |
113 | FF_CONSTANT, | |
114 | FF_AUTOCENTER, | |
115 | -1 | |
116 | }; | |
117 | ||
118 | int lg3ff_init(struct hid_device *hid) | |
119 | { | |
120 | struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list); | |
74f292ca | 121 | struct input_dev *dev = hidinput->input; |
74f292ca GS |
122 | const signed short *ff_bits = ff3_joystick_ac; |
123 | int error; | |
124 | int i; | |
125 | ||
74f292ca | 126 | /* Check that the report looks ok */ |
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127 | if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 35)) |
128 | return -ENODEV; | |
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129 | |
130 | /* Assume single fixed device G940 */ | |
131 | for (i = 0; ff_bits[i] >= 0; i++) | |
132 | set_bit(ff_bits[i], dev->ffbit); | |
133 | ||
134 | error = input_ff_create_memless(dev, NULL, hid_lg3ff_play); | |
135 | if (error) | |
136 | return error; | |
137 | ||
138 | if (test_bit(FF_AUTOCENTER, dev->ffbit)) | |
139 | dev->ff->set_autocenter = hid_lg3ff_set_autocenter; | |
140 | ||
4291ee30 | 141 | hid_info(hid, "Force feedback for Logitech Flight System G940 by Gary Stein <LordCnidarian@gmail.com>\n"); |
74f292ca GS |
142 | return 0; |
143 | } | |
144 |