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49e4739a SC |
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> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
49e4739a | 19 | |
49e4739a SC |
20 | MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>"); |
21 | MODULE_DESCRIPTION("Quanta dual-touch panel"); | |
22 | MODULE_LICENSE("GPL"); | |
23 | ||
24 | #include "hid-ids.h" | |
25 | ||
26 | struct quanta_data { | |
27 | __u16 x, y; | |
28 | __u8 id; | |
29 | bool valid; /* valid finger data, or just placeholder? */ | |
30 | bool first; /* is this the first finger in this frame? */ | |
31 | bool activity_now; /* at least one active finger in this frame? */ | |
32 | bool activity; /* at least one active finger previously? */ | |
33 | }; | |
34 | ||
35 | static int quanta_input_mapping(struct hid_device *hdev, struct hid_input *hi, | |
36 | struct hid_field *field, struct hid_usage *usage, | |
37 | unsigned long **bit, int *max) | |
38 | { | |
39 | switch (usage->hid & HID_USAGE_PAGE) { | |
40 | ||
41 | case HID_UP_GENDESK: | |
42 | switch (usage->hid) { | |
43 | case HID_GD_X: | |
44 | hid_map_usage(hi, usage, bit, max, | |
45 | EV_ABS, ABS_MT_POSITION_X); | |
46 | /* touchscreen emulation */ | |
47 | input_set_abs_params(hi->input, ABS_X, | |
48 | field->logical_minimum, | |
49 | field->logical_maximum, 0, 0); | |
50 | return 1; | |
51 | case HID_GD_Y: | |
52 | hid_map_usage(hi, usage, bit, max, | |
53 | EV_ABS, ABS_MT_POSITION_Y); | |
54 | /* touchscreen emulation */ | |
55 | input_set_abs_params(hi->input, ABS_Y, | |
56 | field->logical_minimum, | |
57 | field->logical_maximum, 0, 0); | |
58 | return 1; | |
59 | } | |
60 | return 0; | |
61 | ||
62 | case HID_UP_DIGITIZER: | |
63 | switch (usage->hid) { | |
64 | case HID_DG_CONFIDENCE: | |
65 | case HID_DG_TIPSWITCH: | |
66 | case HID_DG_INPUTMODE: | |
67 | case HID_DG_DEVICEINDEX: | |
68 | case HID_DG_CONTACTCOUNT: | |
69 | case HID_DG_CONTACTMAX: | |
70 | case HID_DG_TIPPRESSURE: | |
71 | case HID_DG_WIDTH: | |
72 | case HID_DG_HEIGHT: | |
73 | return -1; | |
74 | case HID_DG_INRANGE: | |
75 | /* touchscreen emulation */ | |
76 | hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH); | |
77 | return 1; | |
78 | case HID_DG_CONTACTID: | |
79 | hid_map_usage(hi, usage, bit, max, | |
80 | EV_ABS, ABS_MT_TRACKING_ID); | |
81 | return 1; | |
82 | } | |
83 | return 0; | |
84 | ||
85 | case 0xff000000: | |
86 | /* ignore vendor-specific features */ | |
87 | return -1; | |
88 | } | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | static int quanta_input_mapped(struct hid_device *hdev, struct hid_input *hi, | |
94 | struct hid_field *field, struct hid_usage *usage, | |
95 | unsigned long **bit, int *max) | |
96 | { | |
97 | if (usage->type == EV_KEY || usage->type == EV_ABS) | |
98 | clear_bit(usage->code, *bit); | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | /* | |
104 | * this function is called when a whole finger has been parsed, | |
105 | * so that it can decide what to send to the input layer. | |
106 | */ | |
107 | static void quanta_filter_event(struct quanta_data *td, struct input_dev *input) | |
108 | { | |
109 | ||
110 | td->first = !td->first; /* touchscreen emulation */ | |
111 | ||
112 | if (!td->valid) { | |
113 | /* | |
114 | * touchscreen emulation: if no finger in this frame is valid | |
115 | * and there previously was finger activity, this is a release | |
116 | */ | |
117 | if (!td->first && !td->activity_now && td->activity) { | |
118 | input_event(input, EV_KEY, BTN_TOUCH, 0); | |
119 | td->activity = false; | |
120 | } | |
121 | return; | |
122 | } | |
123 | ||
124 | input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id); | |
125 | input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x); | |
126 | input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y); | |
127 | ||
128 | input_mt_sync(input); | |
129 | td->valid = false; | |
130 | ||
131 | /* touchscreen emulation: if first active finger in this frame... */ | |
132 | if (!td->activity_now) { | |
133 | /* if there was no previous activity, emit touch event */ | |
134 | if (!td->activity) { | |
135 | input_event(input, EV_KEY, BTN_TOUCH, 1); | |
136 | td->activity = true; | |
137 | } | |
138 | td->activity_now = true; | |
139 | /* and in any case this is our preferred finger */ | |
140 | input_event(input, EV_ABS, ABS_X, td->x); | |
141 | input_event(input, EV_ABS, ABS_Y, td->y); | |
142 | } | |
143 | } | |
144 | ||
145 | ||
146 | static int quanta_event(struct hid_device *hid, struct hid_field *field, | |
147 | struct hid_usage *usage, __s32 value) | |
148 | { | |
149 | struct quanta_data *td = hid_get_drvdata(hid); | |
150 | ||
151 | if (hid->claimed & HID_CLAIMED_INPUT) { | |
152 | struct input_dev *input = field->hidinput->input; | |
153 | ||
154 | switch (usage->hid) { | |
155 | case HID_DG_INRANGE: | |
156 | td->valid = !!value; | |
157 | break; | |
158 | case HID_GD_X: | |
159 | td->x = value; | |
160 | break; | |
161 | case HID_GD_Y: | |
162 | td->y = value; | |
163 | quanta_filter_event(td, input); | |
164 | break; | |
165 | case HID_DG_CONTACTID: | |
166 | td->id = value; | |
167 | break; | |
168 | case HID_DG_CONTACTCOUNT: | |
169 | /* touch emulation: this is the last field in a frame */ | |
170 | td->first = false; | |
171 | td->activity_now = false; | |
172 | break; | |
173 | case HID_DG_CONFIDENCE: | |
174 | case HID_DG_TIPSWITCH: | |
175 | /* avoid interference from generic hidinput handling */ | |
176 | break; | |
177 | ||
178 | default: | |
179 | /* fallback to the generic hidinput handling */ | |
180 | return 0; | |
181 | } | |
182 | } | |
183 | ||
184 | /* we have handled the hidinput part, now remains hiddev */ | |
185 | if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event) | |
186 | hid->hiddev_hid_event(hid, field, usage, value); | |
187 | ||
188 | return 1; | |
189 | } | |
190 | ||
191 | static int quanta_probe(struct hid_device *hdev, const struct hid_device_id *id) | |
192 | { | |
193 | int ret; | |
194 | struct quanta_data *td; | |
195 | ||
196 | td = kmalloc(sizeof(struct quanta_data), GFP_KERNEL); | |
197 | if (!td) { | |
198 | dev_err(&hdev->dev, "cannot allocate Quanta Touch data\n"); | |
199 | return -ENOMEM; | |
200 | } | |
201 | td->valid = false; | |
202 | td->activity = false; | |
203 | td->activity_now = false; | |
204 | td->first = false; | |
205 | hid_set_drvdata(hdev, td); | |
206 | ||
207 | ret = hid_parse(hdev); | |
208 | if (!ret) | |
209 | ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); | |
210 | ||
211 | if (ret) | |
212 | kfree(td); | |
213 | ||
214 | return ret; | |
215 | } | |
216 | ||
217 | static void quanta_remove(struct hid_device *hdev) | |
218 | { | |
219 | hid_hw_stop(hdev); | |
220 | kfree(hid_get_drvdata(hdev)); | |
221 | hid_set_drvdata(hdev, NULL); | |
222 | } | |
223 | ||
224 | static const struct hid_device_id quanta_devices[] = { | |
225 | { HID_USB_DEVICE(USB_VENDOR_ID_QUANTA, | |
226 | USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH) }, | |
f54405db AN |
227 | { HID_USB_DEVICE(USB_VENDOR_ID_QUANTA, |
228 | USB_DEVICE_ID_PIXART_IMAGING_INC_OPTICAL_TOUCH_SCREEN) }, | |
49e4739a SC |
229 | { } |
230 | }; | |
231 | MODULE_DEVICE_TABLE(hid, quanta_devices); | |
232 | ||
233 | static const struct hid_usage_id quanta_grabbed_usages[] = { | |
234 | { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID }, | |
235 | { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1} | |
236 | }; | |
237 | ||
238 | static struct hid_driver quanta_driver = { | |
239 | .name = "quanta-touch", | |
240 | .id_table = quanta_devices, | |
241 | .probe = quanta_probe, | |
242 | .remove = quanta_remove, | |
243 | .input_mapping = quanta_input_mapping, | |
244 | .input_mapped = quanta_input_mapped, | |
245 | .usage_table = quanta_grabbed_usages, | |
246 | .event = quanta_event, | |
247 | }; | |
248 | ||
249 | static int __init quanta_init(void) | |
250 | { | |
251 | return hid_register_driver(&quanta_driver); | |
252 | } | |
253 | ||
254 | static void __exit quanta_exit(void) | |
255 | { | |
256 | hid_unregister_driver(&quanta_driver); | |
257 | } | |
258 | ||
259 | module_init(quanta_init); | |
260 | module_exit(quanta_exit); | |
261 |