Commit | Line | Data |
---|---|---|
36213e1e SC |
1 | /* |
2 | * HID driver for Cando 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/slab.h> | |
19 | ||
20 | MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>"); | |
21 | MODULE_DESCRIPTION("Cando dual-touch panel"); | |
22 | MODULE_LICENSE("GPL"); | |
23 | ||
24 | #include "hid-ids.h" | |
25 | ||
26 | struct cando_data { | |
27 | __u16 x, y; | |
28 | __u8 id; | |
29 | __s8 oldest; /* id of the oldest finger in previous frame */ | |
30 | bool valid; /* valid finger data, or just placeholder? */ | |
31 | bool first; /* is this the first finger in this frame? */ | |
32 | __s8 firstid; /* id of the first finger in the frame */ | |
33 | __u16 firstx, firsty; /* (x, y) of the first finger in the frame */ | |
34 | }; | |
35 | ||
36 | static int cando_input_mapping(struct hid_device *hdev, struct hid_input *hi, | |
37 | struct hid_field *field, struct hid_usage *usage, | |
38 | unsigned long **bit, int *max) | |
39 | { | |
40 | switch (usage->hid & HID_USAGE_PAGE) { | |
41 | ||
42 | case HID_UP_GENDESK: | |
43 | switch (usage->hid) { | |
44 | case HID_GD_X: | |
45 | hid_map_usage(hi, usage, bit, max, | |
46 | EV_ABS, ABS_MT_POSITION_X); | |
47 | /* touchscreen emulation */ | |
48 | input_set_abs_params(hi->input, ABS_X, | |
49 | field->logical_minimum, | |
50 | field->logical_maximum, 0, 0); | |
51 | return 1; | |
52 | case HID_GD_Y: | |
53 | hid_map_usage(hi, usage, bit, max, | |
54 | EV_ABS, ABS_MT_POSITION_Y); | |
55 | /* touchscreen emulation */ | |
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 | case HID_DG_TIPSWITCH: | |
66 | case HID_DG_CONTACTMAX: | |
67 | return -1; | |
68 | case HID_DG_INRANGE: | |
69 | /* touchscreen emulation */ | |
70 | hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH); | |
71 | return 1; | |
72 | case HID_DG_CONTACTID: | |
73 | hid_map_usage(hi, usage, bit, max, | |
74 | EV_ABS, ABS_MT_TRACKING_ID); | |
75 | return 1; | |
76 | } | |
77 | return 0; | |
78 | } | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | static int cando_input_mapped(struct hid_device *hdev, struct hid_input *hi, | |
84 | struct hid_field *field, struct hid_usage *usage, | |
85 | unsigned long **bit, int *max) | |
86 | { | |
87 | if (usage->type == EV_KEY || usage->type == EV_ABS) | |
88 | clear_bit(usage->code, *bit); | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | /* | |
94 | * this function is called when a whole finger has been parsed, | |
95 | * so that it can decide what to send to the input layer. | |
96 | */ | |
97 | static void cando_filter_event(struct cando_data *td, struct input_dev *input) | |
98 | { | |
99 | td->first = !td->first; /* touchscreen emulation */ | |
100 | ||
101 | if (!td->valid) { | |
102 | /* | |
103 | * touchscreen emulation: if this is the second finger and | |
104 | * the first was valid, the first was the oldest; if the | |
105 | * first was not valid and there was a valid finger in the | |
106 | * previous frame, this is a release. | |
107 | */ | |
108 | if (td->first) { | |
109 | td->firstid = -1; | |
110 | } else if (td->firstid >= 0) { | |
111 | input_event(input, EV_ABS, ABS_X, td->firstx); | |
112 | input_event(input, EV_ABS, ABS_Y, td->firsty); | |
113 | td->oldest = td->firstid; | |
114 | } else if (td->oldest >= 0) { | |
115 | input_event(input, EV_KEY, BTN_TOUCH, 0); | |
116 | td->oldest = -1; | |
117 | } | |
118 | ||
119 | return; | |
120 | } | |
121 | ||
122 | input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id); | |
123 | input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x); | |
124 | input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y); | |
125 | ||
126 | input_mt_sync(input); | |
127 | ||
128 | /* | |
129 | * touchscreen emulation: if there was no touching finger previously, | |
130 | * emit touch event | |
131 | */ | |
132 | if (td->oldest < 0) { | |
133 | input_event(input, EV_KEY, BTN_TOUCH, 1); | |
134 | td->oldest = td->id; | |
135 | } | |
136 | ||
137 | /* | |
138 | * touchscreen emulation: if this is the first finger, wait for the | |
139 | * second; the oldest is then the second if it was the oldest already | |
140 | * or if there was no first, the first otherwise. | |
141 | */ | |
142 | if (td->first) { | |
143 | td->firstx = td->x; | |
144 | td->firsty = td->y; | |
145 | td->firstid = td->id; | |
146 | } else { | |
147 | int x, y, oldest; | |
148 | if (td->id == td->oldest || td->firstid < 0) { | |
149 | x = td->x; | |
150 | y = td->y; | |
151 | oldest = td->id; | |
152 | } else { | |
153 | x = td->firstx; | |
154 | y = td->firsty; | |
155 | oldest = td->firstid; | |
156 | } | |
157 | input_event(input, EV_ABS, ABS_X, x); | |
158 | input_event(input, EV_ABS, ABS_Y, y); | |
159 | td->oldest = oldest; | |
160 | } | |
161 | } | |
162 | ||
163 | ||
164 | static int cando_event(struct hid_device *hid, struct hid_field *field, | |
165 | struct hid_usage *usage, __s32 value) | |
166 | { | |
167 | struct cando_data *td = hid_get_drvdata(hid); | |
168 | ||
169 | if (hid->claimed & HID_CLAIMED_INPUT) { | |
170 | struct input_dev *input = field->hidinput->input; | |
171 | ||
172 | switch (usage->hid) { | |
173 | case HID_DG_INRANGE: | |
174 | td->valid = 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 | cando_filter_event(td, input); | |
185 | break; | |
186 | case HID_DG_TIPSWITCH: | |
187 | /* avoid interference from generic hidinput handling */ | |
188 | break; | |
189 | ||
190 | default: | |
191 | /* fallback to the generic hidinput handling */ | |
192 | return 0; | |
193 | } | |
194 | } | |
195 | ||
196 | /* we have handled the hidinput part, now remains hiddev */ | |
197 | if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event) | |
198 | hid->hiddev_hid_event(hid, field, usage, value); | |
199 | ||
200 | return 1; | |
201 | } | |
202 | ||
203 | static int cando_probe(struct hid_device *hdev, const struct hid_device_id *id) | |
204 | { | |
205 | int ret; | |
206 | struct cando_data *td; | |
207 | ||
208 | td = kmalloc(sizeof(struct cando_data), GFP_KERNEL); | |
209 | if (!td) { | |
4291ee30 | 210 | hid_err(hdev, "cannot allocate Cando Touch data\n"); |
36213e1e SC |
211 | return -ENOMEM; |
212 | } | |
213 | hid_set_drvdata(hdev, td); | |
653efbb4 SC |
214 | td->first = false; |
215 | td->oldest = -1; | |
216 | td->valid = false; | |
36213e1e SC |
217 | |
218 | ret = hid_parse(hdev); | |
219 | if (!ret) | |
220 | ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); | |
221 | ||
222 | if (ret) | |
223 | kfree(td); | |
224 | ||
225 | return ret; | |
226 | } | |
227 | ||
228 | static void cando_remove(struct hid_device *hdev) | |
229 | { | |
230 | hid_hw_stop(hdev); | |
231 | kfree(hid_get_drvdata(hdev)); | |
232 | hid_set_drvdata(hdev, NULL); | |
233 | } | |
234 | ||
235 | static const struct hid_device_id cando_devices[] = { | |
236 | { HID_USB_DEVICE(USB_VENDOR_ID_CANDO, | |
237 | USB_DEVICE_ID_CANDO_MULTI_TOUCH) }, | |
bc5ab083 BT |
238 | { HID_USB_DEVICE(USB_VENDOR_ID_CANDO, |
239 | USB_DEVICE_ID_CANDO_MULTI_TOUCH_10_1) }, | |
ba4d8abb SC |
240 | { HID_USB_DEVICE(USB_VENDOR_ID_CANDO, |
241 | USB_DEVICE_ID_CANDO_MULTI_TOUCH_11_6) }, | |
272036ed FJ |
242 | { HID_USB_DEVICE(USB_VENDOR_ID_CANDO, |
243 | USB_DEVICE_ID_CANDO_MULTI_TOUCH_15_6) }, | |
36213e1e SC |
244 | { } |
245 | }; | |
246 | MODULE_DEVICE_TABLE(hid, cando_devices); | |
247 | ||
248 | static const struct hid_usage_id cando_grabbed_usages[] = { | |
249 | { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID }, | |
250 | { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1} | |
251 | }; | |
252 | ||
253 | static struct hid_driver cando_driver = { | |
254 | .name = "cando-touch", | |
255 | .id_table = cando_devices, | |
256 | .probe = cando_probe, | |
257 | .remove = cando_remove, | |
258 | .input_mapping = cando_input_mapping, | |
259 | .input_mapped = cando_input_mapped, | |
260 | .usage_table = cando_grabbed_usages, | |
261 | .event = cando_event, | |
262 | }; | |
263 | ||
264 | static int __init cando_init(void) | |
265 | { | |
266 | return hid_register_driver(&cando_driver); | |
267 | } | |
268 | ||
269 | static void __exit cando_exit(void) | |
270 | { | |
271 | hid_unregister_driver(&cando_driver); | |
272 | } | |
273 | ||
274 | module_init(cando_init); | |
275 | module_exit(cando_exit); | |
276 |