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0c3910c2 SC |
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> | |
c872b0fc | 19 | #include <linux/slab.h> |
0c3910c2 SC |
20 | #include "usbhid/usbhid.h" |
21 | ||
22 | MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>"); | |
23 | MODULE_DESCRIPTION("eGalax dual-touch panel"); | |
24 | MODULE_LICENSE("GPL"); | |
25 | ||
26 | #include "hid-ids.h" | |
27 | ||
28 | struct 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 | ||
37 | static 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 | ||
91 | static 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 | */ | |
105 | static 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 | ||
157 | static 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 | ||
162 | if (hid->claimed & HID_CLAIMED_INPUT) { | |
163 | struct input_dev *input = field->hidinput->input; | |
164 | ||
165 | switch (usage->hid) { | |
166 | case HID_DG_INRANGE: | |
167 | case HID_DG_CONFIDENCE: | |
168 | /* avoid interference from generic hidinput handling */ | |
169 | break; | |
170 | case HID_DG_TIPSWITCH: | |
171 | td->valid = value; | |
172 | break; | |
173 | case HID_DG_TIPPRESSURE: | |
174 | td->z = value; | |
175 | break; | |
176 | case HID_DG_CONTACTID: | |
177 | td->id = value; | |
178 | break; | |
179 | case HID_GD_X: | |
180 | td->x = value; | |
181 | break; | |
182 | case HID_GD_Y: | |
183 | td->y = value; | |
184 | /* this is the last field in a finger */ | |
185 | egalax_filter_event(td, input); | |
186 | break; | |
187 | case HID_DG_CONTACTCOUNT: | |
188 | /* touch emulation: this is the last field in a frame */ | |
189 | td->first = false; | |
190 | break; | |
191 | ||
192 | default: | |
193 | /* fallback to the generic hidinput handling */ | |
194 | return 0; | |
195 | } | |
196 | } | |
197 | ||
198 | /* we have handled the hidinput part, now remains hiddev */ | |
199 | if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event) | |
200 | hid->hiddev_hid_event(hid, field, usage, value); | |
201 | ||
202 | return 1; | |
203 | } | |
204 | ||
205 | static int egalax_probe(struct hid_device *hdev, const struct hid_device_id *id) | |
206 | { | |
207 | int ret; | |
208 | struct egalax_data *td; | |
209 | struct hid_report *report; | |
210 | ||
211 | td = kmalloc(sizeof(struct egalax_data), GFP_KERNEL); | |
212 | if (!td) { | |
213 | dev_err(&hdev->dev, "cannot allocate eGalax data\n"); | |
214 | return -ENOMEM; | |
215 | } | |
216 | hid_set_drvdata(hdev, td); | |
217 | ||
218 | ret = hid_parse(hdev); | |
219 | if (ret) | |
220 | goto end; | |
221 | ||
222 | ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); | |
223 | if (ret) | |
224 | goto end; | |
225 | ||
226 | report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[5]; | |
227 | if (report) { | |
228 | report->field[0]->value[0] = 2; | |
229 | usbhid_submit_report(hdev, report, USB_DIR_OUT); | |
230 | } | |
231 | ||
232 | end: | |
233 | if (ret) | |
234 | kfree(td); | |
235 | ||
236 | return ret; | |
237 | } | |
238 | ||
239 | static void egalax_remove(struct hid_device *hdev) | |
240 | { | |
241 | hid_hw_stop(hdev); | |
242 | kfree(hid_get_drvdata(hdev)); | |
243 | hid_set_drvdata(hdev, NULL); | |
244 | } | |
245 | ||
246 | static const struct hid_device_id egalax_devices[] = { | |
247 | { HID_USB_DEVICE(USB_VENDOR_ID_DWAV, | |
248 | USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) }, | |
249 | { } | |
250 | }; | |
251 | MODULE_DEVICE_TABLE(hid, egalax_devices); | |
252 | ||
253 | static const struct hid_usage_id egalax_grabbed_usages[] = { | |
254 | { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID }, | |
255 | { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1} | |
256 | }; | |
257 | ||
258 | static struct hid_driver egalax_driver = { | |
259 | .name = "egalax-touch", | |
260 | .id_table = egalax_devices, | |
261 | .probe = egalax_probe, | |
262 | .remove = egalax_remove, | |
263 | .input_mapping = egalax_input_mapping, | |
264 | .input_mapped = egalax_input_mapped, | |
265 | .usage_table = egalax_grabbed_usages, | |
266 | .event = egalax_event, | |
267 | }; | |
268 | ||
269 | static int __init egalax_init(void) | |
270 | { | |
271 | return hid_register_driver(&egalax_driver); | |
272 | } | |
273 | ||
274 | static void __exit egalax_exit(void) | |
275 | { | |
276 | hid_unregister_driver(&egalax_driver); | |
277 | } | |
278 | ||
279 | module_init(egalax_init); | |
280 | module_exit(egalax_exit); | |
281 |