Root/drivers/hid/hid-lgff.c

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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31
32#include <linux/input.h>
33#include <linux/usb.h>
34#include <linux/hid.h>
35
36#include "usbhid/usbhid.h"
37#include "hid-lg.h"
38
39struct dev_type {
40    u16 idVendor;
41    u16 idProduct;
42    const signed short *ff;
43};
44
45static const signed short ff_rumble[] = {
46    FF_RUMBLE,
47    -1
48};
49
50static const signed short ff_joystick[] = {
51    FF_CONSTANT,
52    -1
53};
54
55static const signed short ff_joystick_ac[] = {
56    FF_CONSTANT,
57    FF_AUTOCENTER,
58    -1
59};
60
61static const struct dev_type devices[] = {
62    { 0x046d, 0xc211, ff_rumble },
63    { 0x046d, 0xc219, ff_rumble },
64    { 0x046d, 0xc283, ff_joystick },
65    { 0x046d, 0xc286, ff_joystick_ac },
66    { 0x046d, 0xc287, ff_joystick_ac },
67    { 0x046d, 0xc293, ff_joystick },
68    { 0x046d, 0xc295, ff_joystick },
69};
70
71static int hid_lgff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
72{
73    struct hid_device *hid = input_get_drvdata(dev);
74    struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
75    struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
76    int x, y;
77    unsigned int left, right;
78
79#define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
80
81    switch (effect->type) {
82    case FF_CONSTANT:
83        x = effect->u.ramp.start_level + 0x7f; /* 0x7f is center */
84        y = effect->u.ramp.end_level + 0x7f;
85        CLAMP(x);
86        CLAMP(y);
87        report->field[0]->value[0] = 0x51;
88        report->field[0]->value[1] = 0x08;
89        report->field[0]->value[2] = x;
90        report->field[0]->value[3] = y;
91        dbg_hid("(x, y)=(%04x, %04x)\n", x, y);
92        usbhid_submit_report(hid, report, USB_DIR_OUT);
93        break;
94
95    case FF_RUMBLE:
96        right = effect->u.rumble.strong_magnitude;
97        left = effect->u.rumble.weak_magnitude;
98        right = right * 0xff / 0xffff;
99        left = left * 0xff / 0xffff;
100        CLAMP(left);
101        CLAMP(right);
102        report->field[0]->value[0] = 0x42;
103        report->field[0]->value[1] = 0x00;
104        report->field[0]->value[2] = left;
105        report->field[0]->value[3] = right;
106        dbg_hid("(left, right)=(%04x, %04x)\n", left, right);
107        usbhid_submit_report(hid, report, USB_DIR_OUT);
108        break;
109    }
110    return 0;
111}
112
113static void hid_lgff_set_autocenter(struct input_dev *dev, u16 magnitude)
114{
115    struct hid_device *hid = input_get_drvdata(dev);
116    struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
117    struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
118    __s32 *value = report->field[0]->value;
119    magnitude = (magnitude >> 12) & 0xf;
120    *value++ = 0xfe;
121    *value++ = 0x0d;
122    *value++ = magnitude; /* clockwise strength */
123    *value++ = magnitude; /* counter-clockwise strength */
124    *value++ = 0x80;
125    *value++ = 0x00;
126    *value = 0x00;
127    usbhid_submit_report(hid, report, USB_DIR_OUT);
128}
129
130int lgff_init(struct hid_device* hid)
131{
132    struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
133    struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
134    struct input_dev *dev = hidinput->input;
135    struct hid_report *report;
136    struct hid_field *field;
137    const signed short *ff_bits = ff_joystick;
138    int error;
139    int i;
140
141    /* Find the report to use */
142    if (list_empty(report_list)) {
143        hid_err(hid, "No output report found\n");
144        return -1;
145    }
146
147    /* Check that the report looks ok */
148    report = list_entry(report_list->next, struct hid_report, list);
149    field = report->field[0];
150    if (!field) {
151        hid_err(hid, "NULL field\n");
152        return -1;
153    }
154
155    for (i = 0; i < ARRAY_SIZE(devices); i++) {
156        if (dev->id.vendor == devices[i].idVendor &&
157            dev->id.product == devices[i].idProduct) {
158            ff_bits = devices[i].ff;
159            break;
160        }
161    }
162
163    for (i = 0; ff_bits[i] >= 0; i++)
164        set_bit(ff_bits[i], dev->ffbit);
165
166    error = input_ff_create_memless(dev, NULL, hid_lgff_play);
167    if (error)
168        return error;
169
170    if ( test_bit(FF_AUTOCENTER, dev->ffbit) )
171        dev->ff->set_autocenter = hid_lgff_set_autocenter;
172
173    pr_info("Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n");
174
175    return 0;
176}
177

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