1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Force feedback support for EMS Trio Linker Plus II
*
* Copyright (c) 2010 Ignaz Forster <ignaz.forster@gmx.de>
*/
/*
*/
#include <linux/hid.h>
#include <linux/input.h>
#include <linux/module.h>
#include "hid-ids.h"
struct emsff_device {
struct hid_report *report;
};
static int emsff_play(struct input_dev *dev, void *data,
struct ff_effect *effect)
{
struct hid_device *hid = input_get_drvdata(dev);
struct emsff_device *emsff = data;
int weak, strong;
weak = effect->u.rumble.weak_magnitude;
strong = effect->u.rumble.strong_magnitude;
dbg_hid("called with 0x%04x 0x%04x\n", strong, weak);
weak = weak * 0xff / 0xffff;
strong = strong * 0xff / 0xffff;
emsff->report->field[0]->value[1] = weak;
emsff->report->field[0]->value[2] = strong;
dbg_hid("running with 0x%02x 0x%02x\n", strong, weak);
hid_hw_request(hid, emsff->report, HID_REQ_SET_REPORT);
return 0;
}
static int emsff_init(struct hid_device *hid)
{
struct emsff_device *emsff;
struct hid_report *report;
struct hid_input *hidinput = list_first_entry(&hid->inputs,
struct hid_input, list);
struct list_head *report_list =
&hid->report_enum[HID_OUTPUT_REPORT].report_list;
struct input_dev *dev = hidinput->input;
int error;
if (list_empty(report_list)) {
hid_err(hid, "no output reports found\n");
return -ENODEV;
}
report = list_first_entry(report_list, struct hid_report, list);
if (report->maxfield < 1) {
hid_err(hid, "no fields in the report\n");
return -ENODEV;
}
if (report->field[0]->report_count < 7) {
hid_err(hid, "not enough values in the field\n");
return -ENODEV;
}
emsff = kzalloc(sizeof(struct emsff_device), GFP_KERNEL);
if (!emsff)
return -ENOMEM;
set_bit(FF_RUMBLE, dev->ffbit);
error = input_ff_create_memless(dev, emsff, emsff_play);
if (error) {
kfree(emsff);
return error;
}
emsff->report = report;
emsff->report->field[0]->value[0] = 0x01;
emsff->report->field[0]->value[1] = 0x00;
emsff->report->field[0]->value[2] = 0x00;
emsff->report->field[0]->value[3] = 0x00;
emsff->report->field[0]->value[4] = 0x00;
emsff->report->field[0]->value[5] = 0x00;
emsff->report->field[0]->value[6] = 0x00;
hid_hw_request(hid, emsff->report, HID_REQ_SET_REPORT);
hid_info(hid, "force feedback for EMS based devices by Ignaz Forster <ignaz.forster@gmx.de>\n");
return 0;
}
static int ems_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
int ret;
ret = hid_parse(hdev);
if (ret) {
hid_err(hdev, "parse failed\n");
goto err;
}
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
if (ret) {
hid_err(hdev, "hw start failed\n");
goto err;
}
ret = emsff_init(hdev);
if (ret) {
dev_err(&hdev->dev, "force feedback init failed\n");
hid_hw_stop(hdev);
goto err;
}
return 0;
err:
return ret;
}
static const struct hid_device_id ems_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_EMS, USB_DEVICE_ID_EMS_TRIO_LINKER_PLUS_II) },
{ }
};
MODULE_DEVICE_TABLE(hid, ems_devices);
static struct hid_driver ems_driver = {
.name = "hkems",
.id_table = ems_devices,
.probe = ems_probe,
};
module_hid_driver(ems_driver);
MODULE_LICENSE("GPL");
|
