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1/*
2 * HID driver for eGalax dual-touch panels
3 *
4 * Copyright (c) 2010 Stephane Chatty <chatty@enac.fr>
5 *
6 */
7
8/*
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
12 * any later version.
13 */
14
15#include <linux/device.h>
16#include <linux/hid.h>
17#include <linux/module.h>
18#include <linux/usb.h>
19#include <linux/slab.h>
20
21MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
22MODULE_DESCRIPTION("eGalax dual-touch panel");
23MODULE_LICENSE("GPL");
24
25#include "hid-ids.h"
26
27void usbhid_submit_report
28(struct hid_device *hid, struct hid_report *report, unsigned char dir);
29
30struct egalax_data {
31 __u16 x, y, z;
32 __u8 id;
33 bool first; /* is this the first finger in the frame? */
34 bool valid; /* valid finger data, or just placeholder? */
35 bool activity; /* at least one active finger previously? */
36 __u16 lastx, lasty; /* latest valid (x, y) in the frame */
37};
38
39static int egalax_input_mapping(struct hid_device *hdev, struct hid_input *hi,
40 struct hid_field *field, struct hid_usage *usage,
41 unsigned long **bit, int *max)
42{
43 switch (usage->hid & HID_USAGE_PAGE) {
44
45 case HID_UP_GENDESK:
46 switch (usage->hid) {
47 case HID_GD_X:
48 hid_map_usage(hi, usage, bit, max,
49 EV_ABS, ABS_MT_POSITION_X);
50 /* touchscreen emulation */
51 input_set_abs_params(hi->input, ABS_X,
52 field->logical_minimum,
53 field->logical_maximum, 0, 0);
54 return 1;
55 case HID_GD_Y:
56 hid_map_usage(hi, usage, bit, max,
57 EV_ABS, ABS_MT_POSITION_Y);
58 /* touchscreen emulation */
59 input_set_abs_params(hi->input, ABS_Y,
60 field->logical_minimum,
61 field->logical_maximum, 0, 0);
62 return 1;
63 }
64 return 0;
65
66 case HID_UP_DIGITIZER:
67 switch (usage->hid) {
68 case HID_DG_TIPSWITCH:
69 /* touchscreen emulation */
70 hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
71 return 1;
72 case HID_DG_INRANGE:
73 case HID_DG_CONFIDENCE:
74 case HID_DG_CONTACTCOUNT:
75 case HID_DG_CONTACTMAX:
76 return -1;
77 case HID_DG_CONTACTID:
78 hid_map_usage(hi, usage, bit, max,
79 EV_ABS, ABS_MT_TRACKING_ID);
80 return 1;
81 case HID_DG_TIPPRESSURE:
82 hid_map_usage(hi, usage, bit, max,
83 EV_ABS, ABS_MT_PRESSURE);
84 return 1;
85 }
86 return 0;
87 }
88
89 /* ignore others (from other reports we won't get anyway) */
90 return -1;
91}
92
93static int egalax_input_mapped(struct hid_device *hdev, struct hid_input *hi,
94 struct hid_field *field, struct hid_usage *usage,
95 unsigned long **bit, int *max)
96{
97 if (usage->type == EV_KEY || usage->type == EV_ABS)
98 clear_bit(usage->code, *bit);
99
100 return 0;
101}
102
103/*
104 * this function is called when a whole finger has been parsed,
105 * so that it can decide what to send to the input layer.
106 */
107static void egalax_filter_event(struct egalax_data *td, struct input_dev *input)
108{
109 td->first = !td->first; /* touchscreen emulation */
110
111 if (td->valid) {
112 /* emit multitouch events */
113 input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id);
114 input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x);
115 input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y);
116 input_event(input, EV_ABS, ABS_MT_PRESSURE, td->z);
117
118 input_mt_sync(input);
119
120 /*
121 * touchscreen emulation: store (x, y) as
122 * the last valid values in this frame
123 */
124 td->lastx = td->x;
125 td->lasty = td->y;
126 }
127
128 /*
129 * touchscreen emulation: if this is the second finger and at least
130 * one in this frame is valid, the latest valid in the frame is
131 * the oldest on the panel, the one we want for single touch
132 */
133 if (!td->first && td->activity) {
134 input_event(input, EV_ABS, ABS_X, td->lastx);
135 input_event(input, EV_ABS, ABS_Y, td->lasty);
136 }
137
138 if (!td->valid) {
139 /*
140 * touchscreen emulation: if the first finger is invalid
141 * and there previously was finger activity, this is a release
142 */
143 if (td->first && td->activity) {
144 input_event(input, EV_KEY, BTN_TOUCH, 0);
145 td->activity = false;
146 }
147 return;
148 }
149
150
151 /* touchscreen emulation: if no previous activity, emit touch event */
152 if (!td->activity) {
153 input_event(input, EV_KEY, BTN_TOUCH, 1);
154 td->activity = true;
155 }
156}
157
158
159static int egalax_event(struct hid_device *hid, struct hid_field *field,
160 struct hid_usage *usage, __s32 value)
161{
162 struct egalax_data *td = hid_get_drvdata(hid);
163
164 /* Note, eGalax has two product lines: the first is resistive and
165 * uses a standard parallel multitouch protocol (product ID ==
166 * 48xx). The second is capacitive and uses an unusual "serial"
167 * protocol with a different message for each multitouch finger
168 * (product ID == 72xx). We do not yet generate a correct event
169 * sequence for the capacitive/serial protocol.
170 */
171 if (hid->claimed & HID_CLAIMED_INPUT) {
172 struct input_dev *input = field->hidinput->input;
173
174 switch (usage->hid) {
175 case HID_DG_INRANGE:
176 case HID_DG_CONFIDENCE:
177 /* avoid interference from generic hidinput handling */
178 break;
179 case HID_DG_TIPSWITCH:
180 td->valid = value;
181 break;
182 case HID_DG_TIPPRESSURE:
183 td->z = value;
184 break;
185 case HID_DG_CONTACTID:
186 td->id = value;
187 break;
188 case HID_GD_X:
189 td->x = value;
190 break;
191 case HID_GD_Y:
192 td->y = value;
193 /* this is the last field in a finger */
194 egalax_filter_event(td, input);
195 break;
196 case HID_DG_CONTACTCOUNT:
197 /* touch emulation: this is the last field in a frame */
198 td->first = false;
199 break;
200
201 default:
202 /* fallback to the generic hidinput handling */
203 return 0;
204 }
205 }
206
207 /* we have handled the hidinput part, now remains hiddev */
208 if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
209 hid->hiddev_hid_event(hid, field, usage, value);
210
211 return 1;
212}
213
214static int egalax_probe(struct hid_device *hdev, const struct hid_device_id *id)
215{
216 int ret;
217 struct egalax_data *td;
218 struct hid_report *report;
219
220 td = kmalloc(sizeof(struct egalax_data), GFP_KERNEL);
221 if (!td) {
222 dev_err(&hdev->dev, "cannot allocate eGalax data\n");
223 return -ENOMEM;
224 }
225 hid_set_drvdata(hdev, td);
226
227 ret = hid_parse(hdev);
228 if (ret)
229 goto end;
230
231 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
232 if (ret)
233 goto end;
234
235 report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[5];
236 if (report) {
237 report->field[0]->value[0] = 2;
238 usbhid_submit_report(hdev, report, USB_DIR_OUT);
239 }
240
241end:
242 if (ret)
243 kfree(td);
244
245 return ret;
246}
247
248static void egalax_remove(struct hid_device *hdev)
249{
250 hid_hw_stop(hdev);
251 kfree(hid_get_drvdata(hdev));
252 hid_set_drvdata(hdev, NULL);
253}
254
255static const struct hid_device_id egalax_devices[] = {
256 { HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
257 USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) },
258 { HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
259 USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH1) },
260 { }
261};
262MODULE_DEVICE_TABLE(hid, egalax_devices);
263
264static const struct hid_usage_id egalax_grabbed_usages[] = {
265 { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
266 { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
267};
268
269static struct hid_driver egalax_driver = {
270 .name = "egalax-touch",
271 .id_table = egalax_devices,
272 .probe = egalax_probe,
273 .remove = egalax_remove,
274 .input_mapping = egalax_input_mapping,
275 .input_mapped = egalax_input_mapped,
276 .usage_table = egalax_grabbed_usages,
277 .event = egalax_event,
278};
279
280static int __init egalax_init(void)
281{
282 return hid_register_driver(&egalax_driver);
283}
284
285static void __exit egalax_exit(void)
286{
287 hid_unregister_driver(&egalax_driver);
288}
289
290module_init(egalax_init);
291module_exit(egalax_exit);
292
generated by cgit v1.2.3 (git 2.39.1) at 2026-09-20 16:16:54 +0000