1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  Force feedback support for Logitech Flight System G940
15 #include "hid-lg.h"
21  * 0 - seems to be command field
22  * 1 - 30 deal with the x axis
23  * 31 -60 deal with the y axis
36  * -127 0 -127 -127 makes the joystick loose on the left,
39  * 0 0 -127 -127 makes the joystick rattle very hard
48 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;  in hid_lg3ff_play()
49 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);  in hid_lg3ff_play()
53  * Available values in the field should always be 63, but we only use up to  in hid_lg3ff_play()
56 	memset(report->field[0]->value, 0,  in hid_lg3ff_play()
57 	       sizeof(__s32) * report->field[0]->report_count);  in hid_lg3ff_play()
59 	switch (effect->type) {  in hid_lg3ff_play()
62  * Already clamped in ff_memless  in hid_lg3ff_play()
65 		x = effect->u.ramp.start_level;  in hid_lg3ff_play()
66 		y = effect->u.ramp.end_level;  in hid_lg3ff_play()
69 		report->field[0]->value[0] = 0x51;  in hid_lg3ff_play()
73  * which get recast here in two's complement 8 bits  in hid_lg3ff_play()
75 		report->field[0]->value[1] = (unsigned char)(-x);  in hid_lg3ff_play()
76 		report->field[0]->value[31] = (unsigned char)(-y);  in hid_lg3ff_play()
86 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;  in hid_lg3ff_set_autocenter()
87 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);  in hid_lg3ff_set_autocenter()
94 	report->field[0]->value[0] = 0x51;  in hid_lg3ff_set_autocenter()
95 	report->field[0]->value[1] = 0x00;  in hid_lg3ff_set_autocenter()
96 	report->field[0]->value[2] = 0x00;  in hid_lg3ff_set_autocenter()
97 	report->field[0]->value[3] = 0x7F;  in hid_lg3ff_set_autocenter()
98 	report->field[0]->value[4] = 0x7F;  in hid_lg3ff_set_autocenter()
99 	report->field[0]->value[31] = 0x00;  in hid_lg3ff_set_autocenter()
100 	report->field[0]->value[32] = 0x00;  in hid_lg3ff_set_autocenter()
101 	report->field[0]->value[33] = 0x7F;  in hid_lg3ff_set_autocenter()
102 	report->field[0]->value[34] = 0x7F;  in hid_lg3ff_set_autocenter()
111 	-1
122 	if (list_empty(&hid->inputs)) {  in lg3ff_init()
124 		return -ENODEV;  in lg3ff_init()
126 	hidinput = list_entry(hid->inputs.next, struct hid_input, list);  in lg3ff_init()
127 	dev = hidinput->input;  in lg3ff_init()
131 		return -ENODEV;  in lg3ff_init()
135 		set_bit(ff_bits[i], dev->ffbit);  in lg3ff_init()
141 	if (test_bit(FF_AUTOCENTER, dev->ffbit))  in lg3ff_init()
142 		dev->ff->set_autocenter = hid_lg3ff_set_autocenter;  in lg3ff_init()
144 …hid_info(hid, "Force feedback for Logitech Flight System G940 by Gary Stein <[email protected]…  in lg3ff_init()