1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Force feedback support for Logitech RumblePad and Rumblepad 2 |
4 | * |
5 | * Copyright (c) 2008 Anssi Hannula <anssi.hannula@gmail.com> |
6 | */ |
7 | |
8 | /* |
9 | */ |
10 | |
11 | |
12 | #include <linux/input.h> |
13 | #include <linux/slab.h> |
14 | #include <linux/hid.h> |
15 | |
16 | #include "hid-lg.h" |
17 | |
18 | struct lg2ff_device { |
19 | struct hid_report *report; |
20 | }; |
21 | |
22 | static int play_effect(struct input_dev *dev, void *data, |
23 | struct ff_effect *effect) |
24 | { |
25 | struct hid_device *hid = input_get_drvdata(dev); |
26 | struct lg2ff_device *lg2ff = data; |
27 | int weak, strong; |
28 | |
29 | strong = effect->u.rumble.strong_magnitude; |
30 | weak = effect->u.rumble.weak_magnitude; |
31 | |
32 | if (weak || strong) { |
33 | weak = weak * 0xff / 0xffff; |
34 | strong = strong * 0xff / 0xffff; |
35 | |
36 | lg2ff->report->field[0]->value[0] = 0x51; |
37 | lg2ff->report->field[0]->value[2] = weak; |
38 | lg2ff->report->field[0]->value[4] = strong; |
39 | } else { |
40 | lg2ff->report->field[0]->value[0] = 0xf3; |
41 | lg2ff->report->field[0]->value[2] = 0x00; |
42 | lg2ff->report->field[0]->value[4] = 0x00; |
43 | } |
44 | |
45 | hid_hw_request(hdev: hid, report: lg2ff->report, reqtype: HID_REQ_SET_REPORT); |
46 | return 0; |
47 | } |
48 | |
49 | int lg2ff_init(struct hid_device *hid) |
50 | { |
51 | struct lg2ff_device *lg2ff; |
52 | struct hid_report *report; |
53 | struct hid_input *hidinput; |
54 | struct input_dev *dev; |
55 | int error; |
56 | |
57 | if (list_empty(head: &hid->inputs)) { |
58 | hid_err(hid, "no inputs found\n" ); |
59 | return -ENODEV; |
60 | } |
61 | hidinput = list_entry(hid->inputs.next, struct hid_input, list); |
62 | dev = hidinput->input; |
63 | |
64 | /* Check that the report looks ok */ |
65 | report = hid_validate_values(hid, type: HID_OUTPUT_REPORT, id: 0, field_index: 0, report_counts: 7); |
66 | if (!report) |
67 | return -ENODEV; |
68 | |
69 | lg2ff = kmalloc(size: sizeof(struct lg2ff_device), GFP_KERNEL); |
70 | if (!lg2ff) |
71 | return -ENOMEM; |
72 | |
73 | set_bit(FF_RUMBLE, addr: dev->ffbit); |
74 | |
75 | error = input_ff_create_memless(dev, data: lg2ff, play_effect); |
76 | if (error) { |
77 | kfree(objp: lg2ff); |
78 | return error; |
79 | } |
80 | |
81 | lg2ff->report = report; |
82 | report->field[0]->value[0] = 0xf3; |
83 | report->field[0]->value[1] = 0x00; |
84 | report->field[0]->value[2] = 0x00; |
85 | report->field[0]->value[3] = 0x00; |
86 | report->field[0]->value[4] = 0x00; |
87 | report->field[0]->value[5] = 0x00; |
88 | report->field[0]->value[6] = 0x00; |
89 | |
90 | hid_hw_request(hdev: hid, report, reqtype: HID_REQ_SET_REPORT); |
91 | |
92 | hid_info(hid, "Force feedback for Logitech variant 2 rumble devices by Anssi Hannula <anssi.hannula@gmail.com>\n" ); |
93 | |
94 | return 0; |
95 | } |
96 | |