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Stephane Chatty0c3910c2010-04-10 16:43:08 +02001/*
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>
Jiri Kosinac872b0f2010-04-10 21:29:09 +020019#include <linux/slab.h>
Stephane Chatty0c3910c2010-04-10 16:43:08 +020020#include "usbhid/usbhid.h"
21
22MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
23MODULE_DESCRIPTION("eGalax dual-touch panel");
24MODULE_LICENSE("GPL");
25
26#include "hid-ids.h"
27
28struct egalax_data {
29 __u16 x, y, z;
30 __u8 id;
31 bool first; /* is this the first finger in the frame? */
32 bool valid; /* valid finger data, or just placeholder? */
33 bool activity; /* at least one active finger previously? */
34 __u16 lastx, lasty; /* latest valid (x, y) in the frame */
35};
36
37static int egalax_input_mapping(struct hid_device *hdev, struct hid_input *hi,
38 struct hid_field *field, struct hid_usage *usage,
39 unsigned long **bit, int *max)
40{
41 switch (usage->hid & HID_USAGE_PAGE) {
42
43 case HID_UP_GENDESK:
44 switch (usage->hid) {
45 case HID_GD_X:
46 hid_map_usage(hi, usage, bit, max,
47 EV_ABS, ABS_MT_POSITION_X);
48 /* touchscreen emulation */
49 input_set_abs_params(hi->input, ABS_X,
50 field->logical_minimum,
51 field->logical_maximum, 0, 0);
52 return 1;
53 case HID_GD_Y:
54 hid_map_usage(hi, usage, bit, max,
55 EV_ABS, ABS_MT_POSITION_Y);
56 /* touchscreen emulation */
57 input_set_abs_params(hi->input, ABS_Y,
58 field->logical_minimum,
59 field->logical_maximum, 0, 0);
60 return 1;
61 }
62 return 0;
63
64 case HID_UP_DIGITIZER:
65 switch (usage->hid) {
66 case HID_DG_TIPSWITCH:
67 /* touchscreen emulation */
68 hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
69 return 1;
70 case HID_DG_INRANGE:
71 case HID_DG_CONFIDENCE:
72 case HID_DG_CONTACTCOUNT:
73 case HID_DG_CONTACTMAX:
74 return -1;
75 case HID_DG_CONTACTID:
76 hid_map_usage(hi, usage, bit, max,
77 EV_ABS, ABS_MT_TRACKING_ID);
78 return 1;
79 case HID_DG_TIPPRESSURE:
80 hid_map_usage(hi, usage, bit, max,
81 EV_ABS, ABS_MT_PRESSURE);
82 return 1;
83 }
84 return 0;
85 }
86
87 /* ignore others (from other reports we won't get anyway) */
88 return -1;
89}
90
91static int egalax_input_mapped(struct hid_device *hdev, struct hid_input *hi,
92 struct hid_field *field, struct hid_usage *usage,
93 unsigned long **bit, int *max)
94{
95 if (usage->type == EV_KEY || usage->type == EV_ABS)
96 clear_bit(usage->code, *bit);
97
98 return 0;
99}
100
101/*
102 * this function is called when a whole finger has been parsed,
103 * so that it can decide what to send to the input layer.
104 */
105static void egalax_filter_event(struct egalax_data *td, struct input_dev *input)
106{
107 td->first = !td->first; /* touchscreen emulation */
108
109 if (td->valid) {
110 /* emit multitouch events */
111 input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id);
112 input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x);
113 input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y);
114 input_event(input, EV_ABS, ABS_MT_PRESSURE, td->z);
115
116 input_mt_sync(input);
117
118 /*
119 * touchscreen emulation: store (x, y) as
120 * the last valid values in this frame
121 */
122 td->lastx = td->x;
123 td->lasty = td->y;
124 }
125
126 /*
127 * touchscreen emulation: if this is the second finger and at least
128 * one in this frame is valid, the latest valid in the frame is
129 * the oldest on the panel, the one we want for single touch
130 */
131 if (!td->first && td->activity) {
132 input_event(input, EV_ABS, ABS_X, td->lastx);
133 input_event(input, EV_ABS, ABS_Y, td->lasty);
134 }
135
136 if (!td->valid) {
137 /*
138 * touchscreen emulation: if the first finger is invalid
139 * and there previously was finger activity, this is a release
140 */
141 if (td->first && td->activity) {
142 input_event(input, EV_KEY, BTN_TOUCH, 0);
143 td->activity = false;
144 }
145 return;
146 }
147
148
149 /* touchscreen emulation: if no previous activity, emit touch event */
150 if (!td->activity) {
151 input_event(input, EV_KEY, BTN_TOUCH, 1);
152 td->activity = true;
153 }
154}
155
156
157static int egalax_event(struct hid_device *hid, struct hid_field *field,
158 struct hid_usage *usage, __s32 value)
159{
160 struct egalax_data *td = hid_get_drvdata(hid);
161
Chris Ball83e44912010-08-16 16:01:28 +0200162 /* Note, eGalax has two product lines: the first is resistive and
163 * uses a standard parallel multitouch protocol (product ID ==
164 * 48xx). The second is capacitive and uses an unusual "serial"
165 * protocol with a different message for each multitouch finger
166 * (product ID == 72xx). We do not yet generate a correct event
167 * sequence for the capacitive/serial protocol.
168 */
Stephane Chatty0c3910c2010-04-10 16:43:08 +0200169 if (hid->claimed & HID_CLAIMED_INPUT) {
170 struct input_dev *input = field->hidinput->input;
171
172 switch (usage->hid) {
173 case HID_DG_INRANGE:
174 case HID_DG_CONFIDENCE:
175 /* avoid interference from generic hidinput handling */
176 break;
177 case HID_DG_TIPSWITCH:
178 td->valid = value;
179 break;
180 case HID_DG_TIPPRESSURE:
181 td->z = value;
182 break;
183 case HID_DG_CONTACTID:
184 td->id = value;
185 break;
186 case HID_GD_X:
187 td->x = value;
188 break;
189 case HID_GD_Y:
190 td->y = value;
191 /* this is the last field in a finger */
192 egalax_filter_event(td, input);
193 break;
194 case HID_DG_CONTACTCOUNT:
195 /* touch emulation: this is the last field in a frame */
196 td->first = false;
197 break;
198
199 default:
200 /* fallback to the generic hidinput handling */
201 return 0;
202 }
203 }
204
205 /* we have handled the hidinput part, now remains hiddev */
206 if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
207 hid->hiddev_hid_event(hid, field, usage, value);
208
209 return 1;
210}
211
212static int egalax_probe(struct hid_device *hdev, const struct hid_device_id *id)
213{
214 int ret;
215 struct egalax_data *td;
216 struct hid_report *report;
217
218 td = kmalloc(sizeof(struct egalax_data), GFP_KERNEL);
219 if (!td) {
220 dev_err(&hdev->dev, "cannot allocate eGalax data\n");
221 return -ENOMEM;
222 }
223 hid_set_drvdata(hdev, td);
224
225 ret = hid_parse(hdev);
226 if (ret)
227 goto end;
228
229 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
230 if (ret)
231 goto end;
232
233 report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[5];
234 if (report) {
235 report->field[0]->value[0] = 2;
236 usbhid_submit_report(hdev, report, USB_DIR_OUT);
237 }
238
239end:
240 if (ret)
241 kfree(td);
242
243 return ret;
244}
245
246static void egalax_remove(struct hid_device *hdev)
247{
248 hid_hw_stop(hdev);
249 kfree(hid_get_drvdata(hdev));
250 hid_set_drvdata(hdev, NULL);
251}
252
253static const struct hid_device_id egalax_devices[] = {
254 { HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
255 USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) },
Chris Ball83e44912010-08-16 16:01:28 +0200256 { HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
257 USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH1) },
Stephane Chatty0c3910c2010-04-10 16:43:08 +0200258 { }
259};
260MODULE_DEVICE_TABLE(hid, egalax_devices);
261
262static const struct hid_usage_id egalax_grabbed_usages[] = {
263 { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
264 { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
265};
266
267static struct hid_driver egalax_driver = {
268 .name = "egalax-touch",
269 .id_table = egalax_devices,
270 .probe = egalax_probe,
271 .remove = egalax_remove,
272 .input_mapping = egalax_input_mapping,
273 .input_mapped = egalax_input_mapped,
274 .usage_table = egalax_grabbed_usages,
275 .event = egalax_event,
276};
277
278static int __init egalax_init(void)
279{
280 return hid_register_driver(&egalax_driver);
281}
282
283static void __exit egalax_exit(void)
284{
285 hid_unregister_driver(&egalax_driver);
286}
287
288module_init(egalax_init);
289module_exit(egalax_exit);
290