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
|
/*
* HID driver for eGalax dual-touch panels
*
* Copyright (c) 2010 Stephane Chatty <chatty@enac.fr>
* Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se>
* Copyright (c) 2010 Canonical, Ltd.
*
*/
/*
* 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>
#include <linux/usb.h>
#include <linux/input/mt.h>
#include <linux/slab.h>
#include "usbhid/usbhid.h"
MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
MODULE_DESCRIPTION("eGalax dual-touch panel");
MODULE_LICENSE("GPL");
#include "hid-ids.h"
#define MAX_SLOTS 2
/* estimated signal-to-noise ratios */
#define SN_MOVE 4096
#define SN_PRESSURE 32
struct egalax_data {
int valid;
int slot;
int touch;
int x, y, z;
};
static void set_abs(struct input_dev *input, unsigned int code,
struct hid_field *field, int snratio)
{
int fmin = field->logical_minimum;
int fmax = field->logical_maximum;
int fuzz = snratio ? (fmax - fmin) / snratio : 0;
input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
}
static int egalax_input_mapping(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
struct input_dev *input = hi->input;
switch (usage->hid & HID_USAGE_PAGE) {
case HID_UP_GENDESK:
switch (usage->hid) {
case HID_GD_X:
field->logical_maximum = 32760;
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_X);
set_abs(input, ABS_MT_POSITION_X, field, SN_MOVE);
/* touchscreen emulation */
set_abs(input, ABS_X, field, SN_MOVE);
return 1;
case HID_GD_Y:
field->logical_maximum = 32760;
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_Y);
set_abs(input, ABS_MT_POSITION_Y, field, SN_MOVE);
/* touchscreen emulation */
set_abs(input, ABS_Y, field, SN_MOVE);
return 1;
}
return 0;
case HID_UP_DIGITIZER:
switch (usage->hid) {
case HID_DG_TIPSWITCH:
/* touchscreen emulation */
hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
input_set_capability(input, EV_KEY, BTN_TOUCH);
return 1;
case HID_DG_INRANGE:
case HID_DG_CONFIDENCE:
case HID_DG_CONTACTCOUNT:
case HID_DG_CONTACTMAX:
return -1;
case HID_DG_CONTACTID:
input_mt_init_slots(input, MAX_SLOTS);
return 1;
case HID_DG_TIPPRESSURE:
field->logical_minimum = 0;
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_PRESSURE);
set_abs(input, ABS_MT_PRESSURE, field, SN_PRESSURE);
/* touchscreen emulation */
set_abs(input, ABS_PRESSURE, field, SN_PRESSURE);
return 1;
}
return 0;
}
/* ignore others (from other reports we won't get anyway) */
return -1;
}
static int egalax_input_mapped(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
/* tell hid-input to skip setup of these event types */
if (usage->type == EV_KEY || usage->type == EV_ABS)
set_bit(usage->type, hi->input->evbit);
return -1;
}
/*
* 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 egalax_filter_event(struct egalax_data *td, struct input_dev *input)
{
input_mt_slot(input, td->slot);
input_mt_report_slot_state(input, MT_TOOL_FINGER, td->touch);
if (td->touch) {
input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x);
input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y);
input_event(input, EV_ABS, ABS_MT_PRESSURE, td->z);
}
input_mt_report_pointer_emulation(input, true);
}
static int egalax_event(struct hid_device *hid, struct hid_field *field,
struct hid_usage *usage, __s32 value)
{
struct egalax_data *td = hid_get_drvdata(hid);
/* Note, eGalax has two product lines: the first is resistive and
* uses a standard parallel multitouch protocol (product ID ==
* 48xx). The second is capacitive and uses an unusual "serial"
* protocol with a different message for each multitouch finger
* (product ID == 72xx).
*/
if (hid->claimed & HID_CLAIMED_INPUT) {
struct input_dev *input = field->hidinput->input;
switch (usage->hid) {
case HID_DG_INRANGE:
td->valid = value;
break;
case HID_DG_CONFIDENCE:
/* avoid interference from generic hidinput handling */
break;
case HID_DG_TIPSWITCH:
td->touch = value;
break;
case HID_DG_TIPPRESSURE:
td->z = value;
break;
case HID_DG_CONTACTID:
td->slot = clamp_val(value, 0, MAX_SLOTS - 1);
break;
case HID_GD_X:
td->x = value;
break;
case HID_GD_Y:
td->y = value;
/* this is the last field in a finger */
if (td->valid)
egalax_filter_event(td, input);
break;
case HID_DG_CONTACTCOUNT:
/* touch emulation: this is the last field in a frame */
break;
default:
/* fallback to the generic hidinput handling */
return 0;
}
}
/* 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 egalax_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
int ret;
struct egalax_data *td;
struct hid_report *report;
td = kzalloc(sizeof(struct egalax_data), GFP_KERNEL);
if (!td) {
hid_err(hdev, "cannot allocate eGalax data\n");
return -ENOMEM;
}
hid_set_drvdata(hdev, td);
ret = hid_parse(hdev);
if (ret)
goto end;
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
if (ret)
goto end;
report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[5];
if (report) {
report->field[0]->value[0] = 2;
usbhid_submit_report(hdev, report, USB_DIR_OUT);
}
end:
if (ret)
kfree(td);
return ret;
}
static void egalax_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 egalax_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) },
{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH1) },
{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH2) },
{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH3) },
{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH4) },
{ }
};
MODULE_DEVICE_TABLE(hid, egalax_devices);
static const struct hid_usage_id egalax_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 egalax_driver = {
.name = "egalax-touch",
.id_table = egalax_devices,
.probe = egalax_probe,
.remove = egalax_remove,
.input_mapping = egalax_input_mapping,
.input_mapped = egalax_input_mapped,
.usage_table = egalax_grabbed_usages,
.event = egalax_event,
};
static int __init egalax_init(void)
{
return hid_register_driver(&egalax_driver);
}
static void __exit egalax_exit(void)
{
hid_unregister_driver(&egalax_driver);
}
module_init(egalax_init);
module_exit(egalax_exit);
|
