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 Logitech Speed Force Wireless
3 *
4 * http://wiibrew.org/wiki/Logitech_USB_steering_wheel
5 *
6 * Copyright (c) 2010 Simon Wood <simon@mungewell.org>
7 */
8
9/*
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 */
24
25
26#include <linux/input.h>
27#include <linux/usb.h>
28#include <linux/hid.h>
29
30#include "usbhid/usbhid.h"
31#include "hid-lg.h"
32
33struct lg4ff_device {
34 struct hid_report *report;
35};
36
37static const signed short ff4_wheel_ac[] = {
38 FF_CONSTANT,
39 FF_AUTOCENTER,
40 -1
41};
42
43static int hid_lg4ff_play(struct input_dev *dev, void *data,
44 struct ff_effect *effect)
45{
46 struct hid_device *hid = input_get_drvdata(dev);
47 struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
48 struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
49 int x;
50
51#define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
52
53 switch (effect->type) {
54 case FF_CONSTANT:
55 x = effect->u.ramp.start_level + 0x80; /* 0x80 is no force */
56 CLAMP(x);
57 report->field[0]->value[0] = 0x11; /* Slot 1 */
58 report->field[0]->value[1] = 0x10;
59 report->field[0]->value[2] = x;
60 report->field[0]->value[3] = 0x00;
61 report->field[0]->value[4] = 0x00;
62 report->field[0]->value[5] = 0x08;
63 report->field[0]->value[6] = 0x00;
64 dbg_hid("Autocenter, x=0x%02X\n", x);
65
66 usbhid_submit_report(hid, report, USB_DIR_OUT);
67 break;
68 }
69 return 0;
70}
71
72static void hid_lg4ff_set_autocenter(struct input_dev *dev, u16 magnitude)
73{
74 struct hid_device *hid = input_get_drvdata(dev);
75 struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
76 struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
77 __s32 *value = report->field[0]->value;
78
79 *value++ = 0xfe;
80 *value++ = 0x0d;
81 *value++ = 0x07;
82 *value++ = 0x07;
83 *value++ = (magnitude >> 8) & 0xff;
84 *value++ = 0x00;
85 *value = 0x00;
86
87 usbhid_submit_report(hid, report, USB_DIR_OUT);
88}
89
90
91int lg4ff_init(struct hid_device *hid)
92{
93 struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
94 struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
95 struct input_dev *dev = hidinput->input;
96 struct hid_report *report;
97 struct hid_field *field;
98 const signed short *ff_bits = ff4_wheel_ac;
99 int error;
100 int i;
101
102 /* Find the report to use */
103 if (list_empty(report_list)) {
104 hid_err(hid, "No output report found\n");
105 return -1;
106 }
107
108 /* Check that the report looks ok */
109 report = list_entry(report_list->next, struct hid_report, list);
110 if (!report) {
111 hid_err(hid, "NULL output report\n");
112 return -1;
113 }
114
115 field = report->field[0];
116 if (!field) {
117 hid_err(hid, "NULL field\n");
118 return -1;
119 }
120
121 for (i = 0; ff_bits[i] >= 0; i++)
122 set_bit(ff_bits[i], dev->ffbit);
123
124 error = input_ff_create_memless(dev, NULL, hid_lg4ff_play);
125
126 if (error)
127 return error;
128
129 if (test_bit(FF_AUTOCENTER, dev->ffbit))
130 dev->ff->set_autocenter = hid_lg4ff_set_autocenter;
131
132 hid_info(hid, "Force feedback for Logitech Speed Force Wireless by Simon Wood <simon@mungewell.org>\n");
133 return 0;
134}
135