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 hid-compliant for some of the devices from
3 * Logitech, namely:
4 * - WingMan Cordless RumblePad
5 * - WingMan Force 3D
6 *
7 * Copyright (c) 2002-2004 Johann Deneux
8 * Copyright (c) 2006 Anssi Hannula <anssi.hannula@gmail.com>
9 */
10
11/*
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 * Should you need to contact me, the author, you can do so by
27 * e-mail - mail your message to <johann.deneux@it.uu.se>
28 */
29
30#include <linux/input.h>
31#include <linux/usb.h>
32#include <linux/hid.h>
33#include "usbhid.h"
34
35struct device_type {
36 u16 idVendor;
37 u16 idProduct;
38 const signed short *ff;
39};
40
41static const signed short ff_rumble[] = {
42 FF_RUMBLE,
43 -1
44};
45
46static const signed short ff_joystick[] = {
47 FF_CONSTANT,
48 -1
49};
50
51static const struct device_type devices[] = {
52 { 0x046d, 0xc211, ff_rumble },
53 { 0x046d, 0xc219, ff_rumble },
54 { 0x046d, 0xc283, ff_joystick },
55 { 0x0000, 0x0000, ff_joystick }
56};
57
58static int hid_lgff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
59{
60 struct hid_device *hid = dev->private;
61 struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
62 struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
63 int x, y;
64 unsigned int left, right;
65
66#define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
67
68 switch (effect->type) {
69 case FF_CONSTANT:
70 x = effect->u.ramp.start_level + 0x7f; /* 0x7f is center */
71 y = effect->u.ramp.end_level + 0x7f;
72 CLAMP(x);
73 CLAMP(y);
74 report->field[0]->value[0] = 0x51;
75 report->field[0]->value[1] = 0x08;
76 report->field[0]->value[2] = x;
77 report->field[0]->value[3] = y;
78 dbg("(x, y)=(%04x, %04x)", x, y);
79 usbhid_submit_report(hid, report, USB_DIR_OUT);
80 break;
81
82 case FF_RUMBLE:
83 right = effect->u.rumble.strong_magnitude;
84 left = effect->u.rumble.weak_magnitude;
85 right = right * 0xff / 0xffff;
86 left = left * 0xff / 0xffff;
87 CLAMP(left);
88 CLAMP(right);
89 report->field[0]->value[0] = 0x42;
90 report->field[0]->value[1] = 0x00;
91 report->field[0]->value[2] = left;
92 report->field[0]->value[3] = right;
93 dbg("(left, right)=(%04x, %04x)", left, right);
94 usbhid_submit_report(hid, report, USB_DIR_OUT);
95 break;
96 }
97 return 0;
98}
99
100int hid_lgff_init(struct hid_device* hid)
101{
102 struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
103 struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
104 struct input_dev *dev = hidinput->input;
105 struct hid_report *report;
106 struct hid_field *field;
107 int error;
108 int i, j;
109
110 /* Find the report to use */
111 if (list_empty(report_list)) {
112 err("No output report found");
113 return -1;
114 }
115
116 /* Check that the report looks ok */
117 report = list_entry(report_list->next, struct hid_report, list);
118 if (!report) {
119 err("NULL output report");
120 return -1;
121 }
122
123 field = report->field[0];
124 if (!field) {
125 err("NULL field");
126 return -1;
127 }
128
129 for (i = 0; i < ARRAY_SIZE(devices); i++) {
130 if (dev->id.vendor == devices[i].idVendor &&
131 dev->id.product == devices[i].idProduct) {
132 for (j = 0; devices[i].ff[j] >= 0; j++)
133 set_bit(devices[i].ff[j], dev->ffbit);
134 break;
135 }
136 }
137
138 error = input_ff_create_memless(dev, NULL, hid_lgff_play);
139 if (error)
140 return error;
141
142 printk(KERN_INFO "Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n");
143
144 return 0;
145}