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-rw-r--r--drivers/hid/hid-quanta.c260
1 files changed, 260 insertions, 0 deletions
diff --git a/drivers/hid/hid-quanta.c b/drivers/hid/hid-quanta.c
new file mode 100644
index 000000000000..01dd51c4986c
--- /dev/null
+++ b/drivers/hid/hid-quanta.c
@@ -0,0 +1,260 @@
1/*
2 * HID driver for Quanta Optical Touch dual-touch panels
3 *
4 * Copyright (c) 2009-2010 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
19MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
20MODULE_DESCRIPTION("Quanta dual-touch panel");
21MODULE_LICENSE("GPL");
22
23#include "hid-ids.h"
24
25struct quanta_data {
26 __u16 x, y;
27 __u8 id;
28 bool valid; /* valid finger data, or just placeholder? */
29 bool first; /* is this the first finger in this frame? */
30 bool activity_now; /* at least one active finger in this frame? */
31 bool activity; /* at least one active finger previously? */
32};
33
34static int quanta_input_mapping(struct hid_device *hdev, struct hid_input *hi,
35 struct hid_field *field, struct hid_usage *usage,
36 unsigned long **bit, int *max)
37{
38 switch (usage->hid & HID_USAGE_PAGE) {
39
40 case HID_UP_GENDESK:
41 switch (usage->hid) {
42 case HID_GD_X:
43 hid_map_usage(hi, usage, bit, max,
44 EV_ABS, ABS_MT_POSITION_X);
45 /* touchscreen emulation */
46 input_set_abs_params(hi->input, ABS_X,
47 field->logical_minimum,
48 field->logical_maximum, 0, 0);
49 return 1;
50 case HID_GD_Y:
51 hid_map_usage(hi, usage, bit, max,
52 EV_ABS, ABS_MT_POSITION_Y);
53 /* touchscreen emulation */
54 input_set_abs_params(hi->input, ABS_Y,
55 field->logical_minimum,
56 field->logical_maximum, 0, 0);
57 return 1;
58 }
59 return 0;
60
61 case HID_UP_DIGITIZER:
62 switch (usage->hid) {
63 case HID_DG_CONFIDENCE:
64 case HID_DG_TIPSWITCH:
65 case HID_DG_INPUTMODE:
66 case HID_DG_DEVICEINDEX:
67 case HID_DG_CONTACTCOUNT:
68 case HID_DG_CONTACTMAX:
69 case HID_DG_TIPPRESSURE:
70 case HID_DG_WIDTH:
71 case HID_DG_HEIGHT:
72 return -1;
73 case HID_DG_INRANGE:
74 /* touchscreen emulation */
75 hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
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 }
82 return 0;
83
84 case 0xff000000:
85 /* ignore vendor-specific features */
86 return -1;
87 }
88
89 return 0;
90}
91
92static int quanta_input_mapped(struct hid_device *hdev, struct hid_input *hi,
93 struct hid_field *field, struct hid_usage *usage,
94 unsigned long **bit, int *max)
95{
96 if (usage->type == EV_KEY || usage->type == EV_ABS)
97 clear_bit(usage->code, *bit);
98
99 return 0;
100}
101
102/*
103 * this function is called when a whole finger has been parsed,
104 * so that it can decide what to send to the input layer.
105 */
106static void quanta_filter_event(struct quanta_data *td, struct input_dev *input)
107{
108
109 td->first = !td->first; /* touchscreen emulation */
110
111 if (!td->valid) {
112 /*
113 * touchscreen emulation: if no finger in this frame is valid
114 * and there previously was finger activity, this is a release
115 */
116 if (!td->first && !td->activity_now && td->activity) {
117 input_event(input, EV_KEY, BTN_TOUCH, 0);
118 td->activity = false;
119 }
120 return;
121 }
122
123 input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id);
124 input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x);
125 input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y);
126
127 input_mt_sync(input);
128 td->valid = false;
129
130 /* touchscreen emulation: if first active finger in this frame... */
131 if (!td->activity_now) {
132 /* if there was no previous activity, emit touch event */
133 if (!td->activity) {
134 input_event(input, EV_KEY, BTN_TOUCH, 1);
135 td->activity = true;
136 }
137 td->activity_now = true;
138 /* and in any case this is our preferred finger */
139 input_event(input, EV_ABS, ABS_X, td->x);
140 input_event(input, EV_ABS, ABS_Y, td->y);
141 }
142}
143
144
145static int quanta_event(struct hid_device *hid, struct hid_field *field,
146 struct hid_usage *usage, __s32 value)
147{
148 struct quanta_data *td = hid_get_drvdata(hid);
149
150 if (hid->claimed & HID_CLAIMED_INPUT) {
151 struct input_dev *input = field->hidinput->input;
152
153 switch (usage->hid) {
154 case HID_DG_INRANGE:
155 td->valid = !!value;
156 break;
157 case HID_GD_X:
158 td->x = value;
159 break;
160 case HID_GD_Y:
161 td->y = value;
162 quanta_filter_event(td, input);
163 break;
164 case HID_DG_CONTACTID:
165 td->id = value;
166 break;
167 case HID_DG_CONTACTCOUNT:
168 /* touch emulation: this is the last field in a frame */
169 td->first = false;
170 td->activity_now = false;
171 break;
172 case HID_DG_CONFIDENCE:
173 case HID_DG_TIPSWITCH:
174 /* avoid interference from generic hidinput handling */
175 break;
176
177 default:
178 /* fallback to the generic hidinput handling */
179 return 0;
180 }
181 }
182
183 /* we have handled the hidinput part, now remains hiddev */
184 if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
185 hid->hiddev_hid_event(hid, field, usage, value);
186
187 return 1;
188}
189
190static int quanta_probe(struct hid_device *hdev, const struct hid_device_id *id)
191{
192 int ret;
193 struct quanta_data *td;
194
195 td = kmalloc(sizeof(struct quanta_data), GFP_KERNEL);
196 if (!td) {
197 dev_err(&hdev->dev, "cannot allocate Quanta Touch data\n");
198 return -ENOMEM;
199 }
200 td->valid = false;
201 td->activity = false;
202 td->activity_now = false;
203 td->first = false;
204 hid_set_drvdata(hdev, td);
205
206 ret = hid_parse(hdev);
207 if (!ret)
208 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
209
210 if (ret)
211 kfree(td);
212
213 return ret;
214}
215
216static void quanta_remove(struct hid_device *hdev)
217{
218 hid_hw_stop(hdev);
219 kfree(hid_get_drvdata(hdev));
220 hid_set_drvdata(hdev, NULL);
221}
222
223static const struct hid_device_id quanta_devices[] = {
224 { HID_USB_DEVICE(USB_VENDOR_ID_QUANTA,
225 USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH) },
226 { HID_USB_DEVICE(USB_VENDOR_ID_QUANTA,
227 USB_DEVICE_ID_PIXART_IMAGING_INC_OPTICAL_TOUCH_SCREEN) },
228 { }
229};
230MODULE_DEVICE_TABLE(hid, quanta_devices);
231
232static const struct hid_usage_id quanta_grabbed_usages[] = {
233 { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
234 { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
235};
236
237static struct hid_driver quanta_driver = {
238 .name = "quanta-touch",
239 .id_table = quanta_devices,
240 .probe = quanta_probe,
241 .remove = quanta_remove,
242 .input_mapping = quanta_input_mapping,
243 .input_mapped = quanta_input_mapped,
244 .usage_table = quanta_grabbed_usages,
245 .event = quanta_event,
246};
247
248static int __init quanta_init(void)
249{
250 return hid_register_driver(&quanta_driver);
251}
252
253static void __exit quanta_exit(void)
254{
255 hid_unregister_driver(&quanta_driver);
256}
257
258module_init(quanta_init);
259module_exit(quanta_exit);
260
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-19 18:56:37 -0500