1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Force feedback support for Logitech RumblePad and Rumblepad 2
5 * Copyright (c) 2008 Anssi Hannula <anssi.hannula@gmail.com>
12 #include <linux/input.h>
13 #include <linux/slab.h>
14 #include <linux/hid.h>
19 struct hid_report *report;
22 static int play_effect(struct input_dev *dev, void *data,
23 struct ff_effect *effect)
25 struct hid_device *hid = input_get_drvdata(dev);
26 struct lg2ff_device *lg2ff = data;
29 strong = effect->u.rumble.strong_magnitude;
30 weak = effect->u.rumble.weak_magnitude;
33 weak = weak * 0xff / 0xffff;
34 strong = strong * 0xff / 0xffff;
36 lg2ff->report->field[0]->value[0] = 0x51;
37 lg2ff->report->field[0]->value[2] = weak;
38 lg2ff->report->field[0]->value[4] = strong;
40 lg2ff->report->field[0]->value[0] = 0xf3;
41 lg2ff->report->field[0]->value[2] = 0x00;
42 lg2ff->report->field[0]->value[4] = 0x00;
45 hid_hw_request(hid, lg2ff->report, HID_REQ_SET_REPORT);
49 int lg2ff_init(struct hid_device *hid)
51 struct lg2ff_device *lg2ff;
52 struct hid_report *report;
53 struct hid_input *hidinput = list_entry(hid->inputs.next,
54 struct hid_input, list);
55 struct input_dev *dev = hidinput->input;
58 /* Check that the report looks ok */
59 report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7);
63 lg2ff = kmalloc(sizeof(struct lg2ff_device), GFP_KERNEL);
67 set_bit(FF_RUMBLE, dev->ffbit);
69 error = input_ff_create_memless(dev, lg2ff, play_effect);
75 lg2ff->report = report;
76 report->field[0]->value[0] = 0xf3;
77 report->field[0]->value[1] = 0x00;
78 report->field[0]->value[2] = 0x00;
79 report->field[0]->value[3] = 0x00;
80 report->field[0]->value[4] = 0x00;
81 report->field[0]->value[5] = 0x00;
82 report->field[0]->value[6] = 0x00;
84 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
86 hid_info(hid, "Force feedback for Logitech variant 2 rumble devices by Anssi Hannula <anssi.hannula@gmail.com>\n");