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151 lines
3.8 KiB
151 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Force feedback support for Logitech Flight System G940 |
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* |
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* Copyright (c) 2009 Gary Stein <[email protected]> |
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*/ |
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/* |
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*/ |
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#include <linux/input.h> |
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#include <linux/hid.h> |
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#include "hid-lg.h" |
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/* |
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* G940 Theory of Operation (from experimentation) |
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* |
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* There are 63 fields (only 3 of them currently used) |
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* 0 - seems to be command field |
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* 1 - 30 deal with the x axis |
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* 31 -60 deal with the y axis |
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* |
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* Field 1 is x axis constant force |
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* Field 31 is y axis constant force |
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* |
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* other interesting fields 1,2,3,4 on x axis |
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* (same for 31,32,33,34 on y axis) |
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* |
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* 0 0 127 127 makes the joystick autocenter hard |
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* |
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* 127 0 127 127 makes the joystick loose on the right, |
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* but stops all movemnt left |
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* |
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* -127 0 -127 -127 makes the joystick loose on the left, |
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* but stops all movement right |
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* |
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* 0 0 -127 -127 makes the joystick rattle very hard |
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* |
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* I'm sure these are effects that I don't know enough about them |
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*/ |
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struct lg3ff_device { |
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struct hid_report *report; |
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}; |
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static int hid_lg3ff_play(struct input_dev *dev, void *data, |
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struct ff_effect *effect) |
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{ |
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struct hid_device *hid = input_get_drvdata(dev); |
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struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; |
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struct hid_report *report = list_entry(report_list->next, struct hid_report, list); |
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int x, y; |
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/* |
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* Available values in the field should always be 63, but we only use up to |
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* 35. Instead, clear the entire area, however big it is. |
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*/ |
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memset(report->field[0]->value, 0, |
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sizeof(__s32) * report->field[0]->report_count); |
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switch (effect->type) { |
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case FF_CONSTANT: |
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/* |
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* Already clamped in ff_memless |
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* 0 is center (different then other logitech) |
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*/ |
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x = effect->u.ramp.start_level; |
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y = effect->u.ramp.end_level; |
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/* send command byte */ |
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report->field[0]->value[0] = 0x51; |
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/* |
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* Sign backwards from other Force3d pro |
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* which get recast here in two's complement 8 bits |
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*/ |
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report->field[0]->value[1] = (unsigned char)(-x); |
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report->field[0]->value[31] = (unsigned char)(-y); |
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hid_hw_request(hid, report, HID_REQ_SET_REPORT); |
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break; |
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} |
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return 0; |
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} |
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static void hid_lg3ff_set_autocenter(struct input_dev *dev, u16 magnitude) |
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{ |
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struct hid_device *hid = input_get_drvdata(dev); |
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struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; |
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struct hid_report *report = list_entry(report_list->next, struct hid_report, list); |
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/* |
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* Auto Centering probed from device |
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* NOTE: deadman's switch on G940 must be covered |
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* for effects to work |
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*/ |
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report->field[0]->value[0] = 0x51; |
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report->field[0]->value[1] = 0x00; |
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report->field[0]->value[2] = 0x00; |
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report->field[0]->value[3] = 0x7F; |
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report->field[0]->value[4] = 0x7F; |
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report->field[0]->value[31] = 0x00; |
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report->field[0]->value[32] = 0x00; |
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report->field[0]->value[33] = 0x7F; |
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report->field[0]->value[34] = 0x7F; |
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hid_hw_request(hid, report, HID_REQ_SET_REPORT); |
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} |
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static const signed short ff3_joystick_ac[] = { |
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FF_CONSTANT, |
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FF_AUTOCENTER, |
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-1 |
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}; |
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int lg3ff_init(struct hid_device *hid) |
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{ |
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struct hid_input *hidinput; |
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struct input_dev *dev; |
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const signed short *ff_bits = ff3_joystick_ac; |
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int error; |
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int i; |
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if (list_empty(&hid->inputs)) { |
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hid_err(hid, "no inputs found\n"); |
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return -ENODEV; |
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} |
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hidinput = list_entry(hid->inputs.next, struct hid_input, list); |
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dev = hidinput->input; |
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/* Check that the report looks ok */ |
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if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 35)) |
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return -ENODEV; |
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/* Assume single fixed device G940 */ |
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for (i = 0; ff_bits[i] >= 0; i++) |
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set_bit(ff_bits[i], dev->ffbit); |
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error = input_ff_create_memless(dev, NULL, hid_lg3ff_play); |
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if (error) |
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return error; |
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if (test_bit(FF_AUTOCENTER, dev->ffbit)) |
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dev->ff->set_autocenter = hid_lg3ff_set_autocenter; |
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hid_info(hid, "Force feedback for Logitech Flight System G940 by Gary Stein <[email protected]>\n"); |
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return 0; |
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} |
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