1/*
2 *  Force feedback support for Logitech RumblePad and Rumblepad 2
3 *
4 *  Copyright (c) 2008 Anssi Hannula <anssi.hannula@gmail.com>
5 */
6
7/*
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23
24#include <linux/input.h>
25#include <linux/slab.h>
26#include <linux/hid.h>
27
28#include "hid-lg.h"
29
30struct lg2ff_device {
31	struct hid_report *report;
32};
33
34static int play_effect(struct input_dev *dev, void *data,
35			 struct ff_effect *effect)
36{
37	struct hid_device *hid = input_get_drvdata(dev);
38	struct lg2ff_device *lg2ff = data;
39	int weak, strong;
40
41	strong = effect->u.rumble.strong_magnitude;
42	weak = effect->u.rumble.weak_magnitude;
43
44	if (weak || strong) {
45		weak = weak * 0xff / 0xffff;
46		strong = strong * 0xff / 0xffff;
47
48		lg2ff->report->field[0]->value[0] = 0x51;
49		lg2ff->report->field[0]->value[2] = weak;
50		lg2ff->report->field[0]->value[4] = strong;
51	} else {
52		lg2ff->report->field[0]->value[0] = 0xf3;
53		lg2ff->report->field[0]->value[2] = 0x00;
54		lg2ff->report->field[0]->value[4] = 0x00;
55	}
56
57	hid_hw_request(hid, lg2ff->report, HID_REQ_SET_REPORT);
58	return 0;
59}
60
61int lg2ff_init(struct hid_device *hid)
62{
63	struct lg2ff_device *lg2ff;
64	struct hid_report *report;
65	struct hid_input *hidinput = list_entry(hid->inputs.next,
66						struct hid_input, list);
67	struct input_dev *dev = hidinput->input;
68	int error;
69
70	/* Check that the report looks ok */
71	report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7);
72	if (!report)
73		return -ENODEV;
74
75	lg2ff = kmalloc(sizeof(struct lg2ff_device), GFP_KERNEL);
76	if (!lg2ff)
77		return -ENOMEM;
78
79	set_bit(FF_RUMBLE, dev->ffbit);
80
81	error = input_ff_create_memless(dev, lg2ff, play_effect);
82	if (error) {
83		kfree(lg2ff);
84		return error;
85	}
86
87	lg2ff->report = report;
88	report->field[0]->value[0] = 0xf3;
89	report->field[0]->value[1] = 0x00;
90	report->field[0]->value[2] = 0x00;
91	report->field[0]->value[3] = 0x00;
92	report->field[0]->value[4] = 0x00;
93	report->field[0]->value[5] = 0x00;
94	report->field[0]->value[6] = 0x00;
95
96	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
97
98	hid_info(hid, "Force feedback for Logitech variant 2 rumble devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
99
100	return 0;
101}
102