1 /*
2 * HID driver for N-Trig touchscreens
3 *
4 * Copyright (c) 2008 Rafi Rubin
5 * Copyright (c) 2009 Stephane Chatty
6 *
7 */
8
9 /*
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the Free
12 * Software Foundation; either version 2 of the License, or (at your option)
13 * any later version.
14 */
15
16 #include <linux/device.h>
17 #include <linux/hid.h>
18 #include <linux/module.h>
19
20 #include "hid-ids.h"
21
22 #define NTRIG_DUPLICATE_USAGES 0x001
23
24 #define nt_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \
25 EV_KEY, (c))
26
27 struct ntrig_data {
28 __s32 x, y, id, w, h;
29 char reading_a_point, found_contact_id;
30 };
31
32 /*
33 * this driver is aimed at two firmware versions in circulation:
34 * - dual pen/finger single touch
35 * - finger multitouch, pen not working
36 */
37
38 static int ntrig_input_mapping(struct hid_device *hdev, struct hid_input *hi,
39 struct hid_field *field, struct hid_usage *usage,
40 unsigned long **bit, int *max)
41 {
42 switch (usage->hid & HID_USAGE_PAGE) {
43
44 case HID_UP_GENDESK:
45 switch (usage->hid) {
46 case HID_GD_X:
47 hid_map_usage(hi, usage, bit, max,
48 EV_ABS, ABS_MT_POSITION_X);
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 input_set_abs_params(hi->input, ABS_Y,
57 field->logical_minimum,
58 field->logical_maximum, 0, 0);
59 return 1;
60 }
61 return 0;
62
63 case HID_UP_DIGITIZER:
64 switch (usage->hid) {
65 /* we do not want to map these for now */
66 case HID_DG_INVERT: /* value is always 0 */
67 case HID_DG_ERASER: /* value is always 0 */
68 case HID_DG_CONTACTID: /* value is useless */
69 case HID_DG_BARRELSWITCH: /* doubtful */
70 case HID_DG_INPUTMODE:
71 case HID_DG_DEVICEINDEX:
72 case HID_DG_CONTACTCOUNT:
73 case HID_DG_CONTACTMAX:
74 return -1;
75
76 /* original mapping by Rafi Rubin */
77 case HID_DG_CONFIDENCE:
78 nt_map_key_clear(BTN_TOOL_DOUBLETAP);
79 return 1;
80
81 /* width/height mapped on TouchMajor/TouchMinor/Orientation */
82 case HID_DG_WIDTH:
83 hid_map_usage(hi, usage, bit, max,
84 EV_ABS, ABS_MT_TOUCH_MAJOR);
85 return 1;
86 case HID_DG_HEIGHT:
87 hid_map_usage(hi, usage, bit, max,
88 EV_ABS, ABS_MT_TOUCH_MINOR);
89 input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
90 0, 1, 0, 0);
91 return 1;
92 }
93 return 0;
94
95 case 0xff000000:
96 /* we do not want to map these: no input-oriented meaning */
97 return -1;
98 }
99
100 return 0;
101 }
102
103 static int ntrig_input_mapped(struct hid_device *hdev, struct hid_input *hi,
104 struct hid_field *field, struct hid_usage *usage,
105 unsigned long **bit, int *max)
106 {
107 if (usage->type == EV_KEY || usage->type == EV_REL
108 || usage->type == EV_ABS)
109 clear_bit(usage->code, *bit);
110
111 return 0;
112 }
113
114 /*
115 * this function is called upon all reports
116 * so that we can filter contact point information,
117 * decide whether we are in multi or single touch mode
118 * and call input_mt_sync after each point if necessary
119 */
120 static int ntrig_event (struct hid_device *hid, struct hid_field *field,
121 struct hid_usage *usage, __s32 value)
122 {
123 struct input_dev *input = field->hidinput->input;
124 struct ntrig_data *nd = hid_get_drvdata(hid);
125
126 if (hid->claimed & HID_CLAIMED_INPUT) {
127 switch (usage->hid) {
128 case HID_GD_X:
129 nd->x = value;
130 nd->reading_a_point = 1;
131 break;
132 case HID_GD_Y:
133 nd->y = value;
134 break;
135 case HID_DG_CONTACTID:
136 nd->id = value;
137 /* we receive this only when in multitouch mode */
138 nd->found_contact_id = 1;
139 break;
140 case HID_DG_WIDTH:
141 nd->w = value;
142 break;
143 case HID_DG_HEIGHT:
144 nd->h = value;
145 /*
146 * when in single touch mode, this is the last
147 * report received in a finger event. We want
148 * to emit a normal (X, Y) position
149 */
150 if (! nd->found_contact_id) {
151 input_event(input, EV_ABS, ABS_X, nd->x);
152 input_event(input, EV_ABS, ABS_Y, nd->y);
153 }
154 break;
155 case HID_DG_TIPPRESSURE:
156 /*
157 * when in single touch mode, this is the last
158 * report received in a pen event. We want
159 * to emit a normal (X, Y) position
160 */
161 if (! nd->found_contact_id) {
162 input_event(input, EV_ABS, ABS_X, nd->x);
163 input_event(input, EV_ABS, ABS_Y, nd->y);
164 input_event(input, EV_ABS, ABS_PRESSURE, value);
165 }
166 break;
167 case 0xff000002:
168 /*
169 * we receive this when the device is in multitouch
170 * mode. The first of the three values tagged with
171 * this usage tells if the contact point is real
172 * or a placeholder
173 */
174 if (!nd->reading_a_point || value != 1)
175 break;
176 /* emit a normal (X, Y) for the first point only */
177 if (nd->id == 0) {
178 input_event(input, EV_ABS, ABS_X, nd->x);
179 input_event(input, EV_ABS, ABS_Y, nd->y);
180 }
181 input_event(input, EV_ABS, ABS_MT_POSITION_X, nd->x);
182 input_event(input, EV_ABS, ABS_MT_POSITION_Y, nd->y);
183 if (nd->w > nd->h) {
184 input_event(input, EV_ABS,
185 ABS_MT_ORIENTATION, 1);
186 input_event(input, EV_ABS,
187 ABS_MT_TOUCH_MAJOR, nd->w);
188 input_event(input, EV_ABS,
189 ABS_MT_TOUCH_MINOR, nd->h);
190 } else {
191 input_event(input, EV_ABS,
192 ABS_MT_ORIENTATION, 0);
193 input_event(input, EV_ABS,
194 ABS_MT_TOUCH_MAJOR, nd->h);
195 input_event(input, EV_ABS,
196 ABS_MT_TOUCH_MINOR, nd->w);
197 }
198 input_mt_sync(field->hidinput->input);
199 nd->reading_a_point = 0;
200 nd->found_contact_id = 0;
201 break;
202
203 default:
204 /* fallback to the generic hidinput handling */
205 return 0;
206 }
207 }
208
209 /* we have handled the hidinput part, now remains hiddev */
210 if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
211 hid->hiddev_hid_event(hid, field, usage, value);
212
213 return 1;
214 }
215
216 static int ntrig_probe(struct hid_device *hdev, const struct hid_device_id *id)
217 {
218 int ret;
219 struct ntrig_data *nd;
220
221 nd = kmalloc(sizeof(struct ntrig_data), GFP_KERNEL);
222 if (!nd) {
223 dev_err(&hdev->dev, "cannot allocate N-Trig data\n");
224 return -ENOMEM;
225 }
226 nd->reading_a_point = 0;
227 nd->found_contact_id = 0;
228 hid_set_drvdata(hdev, nd);
229
230 ret = hid_parse(hdev);
231 if (!ret)
232 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
233
234 if (ret)
235 kfree (nd);
236 return ret;
237 }
238
239 static void ntrig_remove(struct hid_device *hdev)
240 {
241 hid_hw_stop(hdev);
242 kfree(hid_get_drvdata(hdev));
243 }
244
245 static const struct hid_device_id ntrig_devices[] = {
246 { HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN),
247 .driver_data = NTRIG_DUPLICATE_USAGES },
248 { }
249 };
250 MODULE_DEVICE_TABLE(hid, ntrig_devices);
251
252 static const struct hid_usage_id ntrig_grabbed_usages[] = {
253 { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
254 { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
255 };
256
257 static struct hid_driver ntrig_driver = {
258 .name = "ntrig",
259 .id_table = ntrig_devices,
260 .probe = ntrig_probe,
261 .remove = ntrig_remove,
262 .input_mapping = ntrig_input_mapping,
263 .input_mapped = ntrig_input_mapped,
264 .usage_table = ntrig_grabbed_usages,
265 .event = ntrig_event,
266 };
267
268 static int ntrig_init(void)
269 {
270 return hid_register_driver(&ntrig_driver);
271 }
272
273 static void ntrig_exit(void)
274 {
275 hid_unregister_driver(&ntrig_driver);
276 }
277
278 module_init(ntrig_init);
279 module_exit(ntrig_exit);
280 MODULE_LICENSE("GPL");
281
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