Root/drivers/hid/hid-gaff.c

1/*
2 * Force feedback support for GreenAsia (Product ID 0x12) based devices
3 *
4 * The devices are distributed under various names and the same USB device ID
5 * can be used in many game controllers.
6 *
7 *
8 * 0e8f:0012 "GreenAsia Inc. USB Joystick "
9 * - tested with MANTA Warior MM816 and SpeedLink Strike2 SL-6635.
10 *
11 * Copyright (c) 2008 Lukasz Lubojanski <lukasz@lubojanski.info>
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#include <linux/slab.h>
32#include <linux/usb.h>
33#include <linux/hid.h>
34#include <linux/module.h>
35#include "hid-ids.h"
36
37#ifdef CONFIG_GREENASIA_FF
38#include "usbhid/usbhid.h"
39
40struct gaff_device {
41    struct hid_report *report;
42};
43
44static int hid_gaff_play(struct input_dev *dev, void *data,
45             struct ff_effect *effect)
46{
47    struct hid_device *hid = input_get_drvdata(dev);
48    struct gaff_device *gaff = data;
49    int left, right;
50
51    left = effect->u.rumble.strong_magnitude;
52    right = effect->u.rumble.weak_magnitude;
53
54    dbg_hid("called with 0x%04x 0x%04x", left, right);
55
56    left = left * 0xfe / 0xffff;
57    right = right * 0xfe / 0xffff;
58
59    gaff->report->field[0]->value[0] = 0x51;
60    gaff->report->field[0]->value[1] = 0x0;
61    gaff->report->field[0]->value[2] = right;
62    gaff->report->field[0]->value[3] = 0;
63    gaff->report->field[0]->value[4] = left;
64    gaff->report->field[0]->value[5] = 0;
65    dbg_hid("running with 0x%02x 0x%02x", left, right);
66    usbhid_submit_report(hid, gaff->report, USB_DIR_OUT);
67
68    gaff->report->field[0]->value[0] = 0xfa;
69    gaff->report->field[0]->value[1] = 0xfe;
70    gaff->report->field[0]->value[2] = 0x0;
71    gaff->report->field[0]->value[4] = 0x0;
72
73    usbhid_submit_report(hid, gaff->report, USB_DIR_OUT);
74
75    return 0;
76}
77
78static int gaff_init(struct hid_device *hid)
79{
80    struct gaff_device *gaff;
81    struct hid_report *report;
82    struct hid_input *hidinput = list_entry(hid->inputs.next,
83                        struct hid_input, list);
84    struct list_head *report_list =
85            &hid->report_enum[HID_OUTPUT_REPORT].report_list;
86    struct list_head *report_ptr = report_list;
87    struct input_dev *dev = hidinput->input;
88    int error;
89
90    if (list_empty(report_list)) {
91        hid_err(hid, "no output reports found\n");
92        return -ENODEV;
93    }
94
95    report_ptr = report_ptr->next;
96
97    report = list_entry(report_ptr, struct hid_report, list);
98    if (report->maxfield < 1) {
99        hid_err(hid, "no fields in the report\n");
100        return -ENODEV;
101    }
102
103    if (report->field[0]->report_count < 6) {
104        hid_err(hid, "not enough values in the field\n");
105        return -ENODEV;
106    }
107
108    gaff = kzalloc(sizeof(struct gaff_device), GFP_KERNEL);
109    if (!gaff)
110        return -ENOMEM;
111
112    set_bit(FF_RUMBLE, dev->ffbit);
113
114    error = input_ff_create_memless(dev, gaff, hid_gaff_play);
115    if (error) {
116        kfree(gaff);
117        return error;
118    }
119
120    gaff->report = report;
121    gaff->report->field[0]->value[0] = 0x51;
122    gaff->report->field[0]->value[1] = 0x00;
123    gaff->report->field[0]->value[2] = 0x00;
124    gaff->report->field[0]->value[3] = 0x00;
125    usbhid_submit_report(hid, gaff->report, USB_DIR_OUT);
126
127    gaff->report->field[0]->value[0] = 0xfa;
128    gaff->report->field[0]->value[1] = 0xfe;
129
130    usbhid_submit_report(hid, gaff->report, USB_DIR_OUT);
131
132    hid_info(hid, "Force Feedback for GreenAsia 0x12 devices by Lukasz Lubojanski <lukasz@lubojanski.info>\n");
133
134    return 0;
135}
136#else
137static inline int gaff_init(struct hid_device *hdev)
138{
139    return 0;
140}
141#endif
142
143static int ga_probe(struct hid_device *hdev, const struct hid_device_id *id)
144{
145    int ret;
146
147    dev_dbg(&hdev->dev, "Greenasia HID hardware probe...");
148
149    ret = hid_parse(hdev);
150    if (ret) {
151        hid_err(hdev, "parse failed\n");
152        goto err;
153    }
154
155    ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
156    if (ret) {
157        hid_err(hdev, "hw start failed\n");
158        goto err;
159    }
160
161    gaff_init(hdev);
162
163    return 0;
164err:
165    return ret;
166}
167
168static const struct hid_device_id ga_devices[] = {
169    { HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012), },
170    { }
171};
172MODULE_DEVICE_TABLE(hid, ga_devices);
173
174static struct hid_driver ga_driver = {
175    .name = "greenasia",
176    .id_table = ga_devices,
177    .probe = ga_probe,
178};
179
180static int __init ga_init(void)
181{
182    return hid_register_driver(&ga_driver);
183}
184
185static void __exit ga_exit(void)
186{
187    hid_unregister_driver(&ga_driver);
188}
189
190module_init(ga_init);
191module_exit(ga_exit);
192MODULE_LICENSE("GPL");
193

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