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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? */ | |
f5166110 | 34 | __u16 lastx, lasty, lastz; /* latest valid (x, y, z) in the frame */ |
0c3910c2 SC |
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); | |
f5166110 PM |
82 | /* touchscreen emulation */ |
83 | input_set_abs_params(hi->input, ABS_PRESSURE, | |
84 | field->logical_minimum, | |
85 | field->logical_maximum, 0, 0); | |
0c3910c2 SC |
86 | return 1; |
87 | } | |
88 | return 0; | |
89 | } | |
90 | ||
91 | /* ignore others (from other reports we won't get anyway) */ | |
92 | return -1; | |
93 | } | |
94 | ||
95 | static int egalax_input_mapped(struct hid_device *hdev, struct hid_input *hi, | |
96 | struct hid_field *field, struct hid_usage *usage, | |
97 | unsigned long **bit, int *max) | |
98 | { | |
99 | if (usage->type == EV_KEY || usage->type == EV_ABS) | |
100 | clear_bit(usage->code, *bit); | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | /* | |
106 | * this function is called when a whole finger has been parsed, | |
107 | * so that it can decide what to send to the input layer. | |
108 | */ | |
109 | static void egalax_filter_event(struct egalax_data *td, struct input_dev *input) | |
110 | { | |
111 | td->first = !td->first; /* touchscreen emulation */ | |
112 | ||
113 | if (td->valid) { | |
114 | /* emit multitouch events */ | |
115 | input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id); | |
f5166110 PM |
116 | input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x >> 3); |
117 | input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y >> 3); | |
0c3910c2 SC |
118 | input_event(input, EV_ABS, ABS_MT_PRESSURE, td->z); |
119 | ||
120 | input_mt_sync(input); | |
121 | ||
122 | /* | |
123 | * touchscreen emulation: store (x, y) as | |
124 | * the last valid values in this frame | |
125 | */ | |
126 | td->lastx = td->x; | |
127 | td->lasty = td->y; | |
f5166110 | 128 | td->lastz = td->z; |
0c3910c2 SC |
129 | } |
130 | ||
131 | /* | |
132 | * touchscreen emulation: if this is the second finger and at least | |
133 | * one in this frame is valid, the latest valid in the frame is | |
134 | * the oldest on the panel, the one we want for single touch | |
135 | */ | |
136 | if (!td->first && td->activity) { | |
f5166110 PM |
137 | input_event(input, EV_ABS, ABS_X, td->lastx >> 3); |
138 | input_event(input, EV_ABS, ABS_Y, td->lasty >> 3); | |
139 | input_event(input, EV_ABS, ABS_PRESSURE, td->lastz); | |
0c3910c2 SC |
140 | } |
141 | ||
142 | if (!td->valid) { | |
143 | /* | |
144 | * touchscreen emulation: if the first finger is invalid | |
145 | * and there previously was finger activity, this is a release | |
146 | */ | |
147 | if (td->first && td->activity) { | |
148 | input_event(input, EV_KEY, BTN_TOUCH, 0); | |
149 | td->activity = false; | |
150 | } | |
151 | return; | |
152 | } | |
153 | ||
154 | ||
155 | /* touchscreen emulation: if no previous activity, emit touch event */ | |
156 | if (!td->activity) { | |
157 | input_event(input, EV_KEY, BTN_TOUCH, 1); | |
158 | td->activity = true; | |
159 | } | |
160 | } | |
161 | ||
162 | ||
163 | static int egalax_event(struct hid_device *hid, struct hid_field *field, | |
164 | struct hid_usage *usage, __s32 value) | |
165 | { | |
166 | struct egalax_data *td = hid_get_drvdata(hid); | |
167 | ||
83e44918 CB |
168 | /* Note, eGalax has two product lines: the first is resistive and |
169 | * uses a standard parallel multitouch protocol (product ID == | |
170 | * 48xx). The second is capacitive and uses an unusual "serial" | |
171 | * protocol with a different message for each multitouch finger | |
172 | * (product ID == 72xx). We do not yet generate a correct event | |
173 | * sequence for the capacitive/serial protocol. | |
174 | */ | |
0c3910c2 SC |
175 | if (hid->claimed & HID_CLAIMED_INPUT) { |
176 | struct input_dev *input = field->hidinput->input; | |
177 | ||
178 | switch (usage->hid) { | |
179 | case HID_DG_INRANGE: | |
180 | case HID_DG_CONFIDENCE: | |
181 | /* avoid interference from generic hidinput handling */ | |
182 | break; | |
183 | case HID_DG_TIPSWITCH: | |
184 | td->valid = value; | |
185 | break; | |
186 | case HID_DG_TIPPRESSURE: | |
187 | td->z = value; | |
188 | break; | |
189 | case HID_DG_CONTACTID: | |
190 | td->id = value; | |
191 | break; | |
192 | case HID_GD_X: | |
193 | td->x = value; | |
194 | break; | |
195 | case HID_GD_Y: | |
196 | td->y = value; | |
197 | /* this is the last field in a finger */ | |
198 | egalax_filter_event(td, input); | |
199 | break; | |
200 | case HID_DG_CONTACTCOUNT: | |
201 | /* touch emulation: this is the last field in a frame */ | |
202 | td->first = false; | |
203 | break; | |
204 | ||
205 | default: | |
206 | /* fallback to the generic hidinput handling */ | |
207 | return 0; | |
208 | } | |
209 | } | |
210 | ||
211 | /* we have handled the hidinput part, now remains hiddev */ | |
212 | if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event) | |
213 | hid->hiddev_hid_event(hid, field, usage, value); | |
214 | ||
215 | return 1; | |
216 | } | |
217 | ||
218 | static int egalax_probe(struct hid_device *hdev, const struct hid_device_id *id) | |
219 | { | |
220 | int ret; | |
221 | struct egalax_data *td; | |
222 | struct hid_report *report; | |
223 | ||
224 | td = kmalloc(sizeof(struct egalax_data), GFP_KERNEL); | |
225 | if (!td) { | |
226 | dev_err(&hdev->dev, "cannot allocate eGalax data\n"); | |
227 | return -ENOMEM; | |
228 | } | |
229 | hid_set_drvdata(hdev, td); | |
230 | ||
231 | ret = hid_parse(hdev); | |
232 | if (ret) | |
233 | goto end; | |
234 | ||
235 | ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); | |
236 | if (ret) | |
237 | goto end; | |
238 | ||
239 | report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[5]; | |
240 | if (report) { | |
241 | report->field[0]->value[0] = 2; | |
242 | usbhid_submit_report(hdev, report, USB_DIR_OUT); | |
243 | } | |
244 | ||
245 | end: | |
246 | if (ret) | |
247 | kfree(td); | |
248 | ||
249 | return ret; | |
250 | } | |
251 | ||
252 | static void egalax_remove(struct hid_device *hdev) | |
253 | { | |
254 | hid_hw_stop(hdev); | |
255 | kfree(hid_get_drvdata(hdev)); | |
256 | hid_set_drvdata(hdev, NULL); | |
257 | } | |
258 | ||
259 | static const struct hid_device_id egalax_devices[] = { | |
260 | { HID_USB_DEVICE(USB_VENDOR_ID_DWAV, | |
261 | USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) }, | |
83e44918 CB |
262 | { HID_USB_DEVICE(USB_VENDOR_ID_DWAV, |
263 | USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH1) }, | |
0c3910c2 SC |
264 | { } |
265 | }; | |
266 | MODULE_DEVICE_TABLE(hid, egalax_devices); | |
267 | ||
268 | static const struct hid_usage_id egalax_grabbed_usages[] = { | |
269 | { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID }, | |
270 | { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1} | |
271 | }; | |
272 | ||
273 | static struct hid_driver egalax_driver = { | |
274 | .name = "egalax-touch", | |
275 | .id_table = egalax_devices, | |
276 | .probe = egalax_probe, | |
277 | .remove = egalax_remove, | |
278 | .input_mapping = egalax_input_mapping, | |
279 | .input_mapped = egalax_input_mapped, | |
280 | .usage_table = egalax_grabbed_usages, | |
281 | .event = egalax_event, | |
282 | }; | |
283 | ||
284 | static int __init egalax_init(void) | |
285 | { | |
286 | return hid_register_driver(&egalax_driver); | |
287 | } | |
288 | ||
289 | static void __exit egalax_exit(void) | |
290 | { | |
291 | hid_unregister_driver(&egalax_driver); | |
292 | } | |
293 | ||
294 | module_init(egalax_init); | |
295 | module_exit(egalax_exit); | |
296 |