tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Force feedback support for various HID compliant devices by ThrustMaster:
3 * ThrustMaster FireStorm Dual Power 2
4 * and possibly others whose device ids haven't been added.
5 *
6 * Modified to support ThrustMaster devices by Zinx Verituse
7 * on 2003-01-25 from the Logitech force feedback driver,
8 * which is by Johann Deneux.
9 *
10 * Copyright (c) 2003 Zinx Verituse <zinx@epicsol.org>
11 * Copyright (c) 2002 Johann Deneux
12 */
13
14/*
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 */
29
30#include <linux/input.h>
31
32#undef DEBUG
33#include <linux/usb.h>
34
35#include "hid.h"
36
37/* Usages for thrustmaster devices I know about */
38#define THRUSTMASTER_USAGE_RUMBLE_LR (HID_UP_GENDESK | 0xbb)
39
40
41struct tmff_device {
42 struct hid_report *report;
43 struct hid_field *rumble;
44};
45
46/* Changes values from 0 to 0xffff into values from minimum to maximum */
47static inline int hid_tmff_scale(unsigned int in, int minimum, int maximum)
48{
49 int ret;
50
51 ret = (in * (maximum - minimum) / 0xffff) + minimum;
52 if (ret < minimum)
53 return minimum;
54 if (ret > maximum)
55 return maximum;
56 return ret;
57}
58
59static int hid_tmff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
60{
61 struct hid_device *hid = dev->private;
62 struct tmff_device *tmff = data;
63 int left, right; /* Rumbling */
64
65 left = hid_tmff_scale(effect->u.rumble.weak_magnitude,
66 tmff->rumble->logical_minimum, tmff->rumble->logical_maximum);
67 right = hid_tmff_scale(effect->u.rumble.strong_magnitude,
68 tmff->rumble->logical_minimum, tmff->rumble->logical_maximum);
69
70 tmff->rumble->value[0] = left;
71 tmff->rumble->value[1] = right;
72 dbg("(left,right)=(%08x, %08x)", left, right);
73 hid_submit_report(hid, tmff->report, USB_DIR_OUT);
74
75 return 0;
76}
77
78int hid_tmff_init(struct hid_device *hid)
79{
80 struct tmff_device *tmff;
81 struct list_head *pos;
82 struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
83 struct input_dev *input_dev = hidinput->input;
84 int error;
85
86 tmff = kzalloc(sizeof(struct tmff_device), GFP_KERNEL);
87 if (!tmff)
88 return -ENOMEM;
89
90 /* Find the report to use */
91 __list_for_each(pos, &hid->report_enum[HID_OUTPUT_REPORT].report_list) {
92 struct hid_report *report = (struct hid_report *)pos;
93 int fieldnum;
94
95 for (fieldnum = 0; fieldnum < report->maxfield; ++fieldnum) {
96 struct hid_field *field = report->field[fieldnum];
97
98 if (field->maxusage <= 0)
99 continue;
100
101 switch (field->usage[0].hid) {
102 case THRUSTMASTER_USAGE_RUMBLE_LR:
103 if (field->report_count < 2) {
104 warn("ignoring THRUSTMASTER_USAGE_RUMBLE_LR with report_count < 2");
105 continue;
106 }
107
108 if (field->logical_maximum == field->logical_minimum) {
109 warn("ignoring THRUSTMASTER_USAGE_RUMBLE_LR with logical_maximum == logical_minimum");
110 continue;
111 }
112
113 if (tmff->report && tmff->report != report) {
114 warn("ignoring THRUSTMASTER_USAGE_RUMBLE_LR in other report");
115 continue;
116 }
117
118 if (tmff->rumble && tmff->rumble != field) {
119 warn("ignoring duplicate THRUSTMASTER_USAGE_RUMBLE_LR");
120 continue;
121 }
122
123 tmff->report = report;
124 tmff->rumble = field;
125
126 set_bit(FF_RUMBLE, input_dev->ffbit);
127 break;
128
129 default:
130 warn("ignoring unknown output usage %08x", field->usage[0].hid);
131 continue;
132 }
133 }
134 }
135
136 error = input_ff_create_memless(input_dev, tmff, hid_tmff_play);
137 if (error) {
138 kfree(tmff);
139 return error;
140 }
141
142 info("Force feedback for ThrustMaster rumble pad devices by Zinx Verituse <zinx@epicsol.org>");
143
144 return 0;
145}
146