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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
|
/*
* HID driver for Stantum multitouch panels
*
* Copyright (c) 2009 Stephane Chatty <chatty@enac.fr>
*
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*/
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>
MODULE_VERSION("0.6");
MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
MODULE_DESCRIPTION("Stantum HID multitouch panels");
MODULE_LICENSE("GPL");
#include "hid-ids.h"
struct stantum_data {
__s32 x, y, z, w, h; /* x, y, pressure, width, height */
__u16 id; /* touch id */
bool valid; /* valid finger data, or just placeholder? */
bool first; /* first finger in the HID packet? */
bool activity; /* at least one active finger so far? */
};
static int stantum_input_mapping(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
switch (usage->hid & HID_USAGE_PAGE) {
case HID_UP_GENDESK:
switch (usage->hid) {
case HID_GD_X:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_X);
/* touchscreen emulation */
input_set_abs_params(hi->input, ABS_X,
field->logical_minimum,
field->logical_maximum, 0, 0);
return 1;
case HID_GD_Y:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_Y);
/* touchscreen emulation */
input_set_abs_params(hi->input, ABS_Y,
field->logical_minimum,
field->logical_maximum, 0, 0);
return 1;
}
return 0;
case HID_UP_DIGITIZER:
switch (usage->hid) {
case HID_DG_INRANGE:
case HID_DG_CONFIDENCE:
case HID_DG_INPUTMODE:
case HID_DG_DEVICEINDEX:
case HID_DG_CONTACTCOUNT:
case HID_DG_CONTACTMAX:
return -1;
case HID_DG_TIPSWITCH:
/* touchscreen emulation */
hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
return 1;
case HID_DG_WIDTH:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_TOUCH_MAJOR);
return 1;
case HID_DG_HEIGHT:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_TOUCH_MINOR);
input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
1, 1, 0, 0);
return 1;
case HID_DG_TIPPRESSURE:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_PRESSURE);
return 1;
case HID_DG_CONTACTID:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_TRACKING_ID);
return 1;
}
return 0;
case 0xff000000:
/* no input-oriented meaning */
return -1;
}
return 0;
}
static int stantum_input_mapped(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
if (usage->type == EV_KEY || usage->type == EV_ABS)
clear_bit(usage->code, *bit);
return 0;
}
/*
* this function is called when a whole finger has been parsed,
* so that it can decide what to send to the input layer.
*/
static void stantum_filter_event(struct stantum_data *sd,
struct input_dev *input)
{
bool wide;
if (!sd->valid) {
/*
* touchscreen emulation: if the first finger is not valid and
* there previously was finger activity, this is a release
*/
if (sd->first && sd->activity) {
input_event(input, EV_KEY, BTN_TOUCH, 0);
sd->activity = false;
}
return;
}
input_event(input, EV_ABS, ABS_MT_TRACKING_ID, sd->id);
input_event(input, EV_ABS, ABS_MT_POSITION_X, sd->x);
input_event(input, EV_ABS, ABS_MT_POSITION_Y, sd->y);
wide = (sd->w > sd->h);
input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, wide ? sd->w : sd->h);
input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, wide ? sd->h : sd->w);
input_event(input, EV_ABS, ABS_MT_PRESSURE, sd->z);
input_mt_sync(input);
sd->valid = false;
/* touchscreen emulation */
if (sd->first) {
if (!sd->activity) {
input_event(input, EV_KEY, BTN_TOUCH, 1);
sd->activity = true;
}
input_event(input, EV_ABS, ABS_X, sd->x);
input_event(input, EV_ABS, ABS_Y, sd->y);
}
sd->first = false;
}
static int stantum_event(struct hid_device *hid, struct hid_field *field,
struct hid_usage *usage, __s32 value)
{
struct stantum_data *sd = hid_get_drvdata(hid);
if (hid->claimed & HID_CLAIMED_INPUT) {
struct input_dev *input = field->hidinput->input;
switch (usage->hid) {
case HID_DG_INRANGE:
/* this is the last field in a finger */
stantum_filter_event(sd, input);
break;
case HID_DG_WIDTH:
sd->w = value;
break;
case HID_DG_HEIGHT:
sd->h = value;
break;
case HID_GD_X:
sd->x = value;
break;
case HID_GD_Y:
sd->y = value;
break;
case HID_DG_TIPPRESSURE:
sd->z = value;
break;
case HID_DG_CONTACTID:
sd->id = value;
break;
case HID_DG_CONFIDENCE:
sd->valid = !!value;
break;
case 0xff000002:
/* this comes only before the first finger */
sd->first = true;
break;
default:
/* ignore the others */
return 1;
}
}
/* we have handled the hidinput part, now remains hiddev */
if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
hid->hiddev_hid_event(hid, field, usage, value);
return 1;
}
static int stantum_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
int ret;
struct stantum_data *sd;
sd = kmalloc(sizeof(struct stantum_data), GFP_KERNEL);
if (!sd) {
dev_err(&hdev->dev, "cannot allocate Stantum data\n");
return -ENOMEM;
}
sd->valid = false;
sd->first = false;
sd->activity = false;
hid_set_drvdata(hdev, sd);
ret = hid_parse(hdev);
if (!ret)
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
if (ret)
kfree(sd);
return ret;
}
static void stantum_remove(struct hid_device *hdev)
{
hid_hw_stop(hdev);
kfree(hid_get_drvdata(hdev));
hid_set_drvdata(hdev, NULL);
}
static const struct hid_device_id stantum_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_STANTUM, USB_DEVICE_ID_MTP) },
{ }
};
MODULE_DEVICE_TABLE(hid, stantum_devices);
static const struct hid_usage_id stantum_grabbed_usages[] = {
{ HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
};
static struct hid_driver stantum_driver = {
.name = "stantum",
.id_table = stantum_devices,
.probe = stantum_probe,
.remove = stantum_remove,
.input_mapping = stantum_input_mapping,
.input_mapped = stantum_input_mapped,
.usage_table = stantum_grabbed_usages,
.event = stantum_event,
};
static int __init stantum_init(void)
{
return hid_register_driver(&stantum_driver);
}
static void __exit stantum_exit(void)
{
hid_unregister_driver(&stantum_driver);
}
module_init(stantum_init);
module_exit(stantum_exit);
|
