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d3fb5454 SC |
1 | /* |
2 | * HID driver for Stantum multitouch panels | |
3 | * | |
4 | * Copyright (c) 2009 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> |
d3fb5454 | 19 | |
d3fb5454 SC |
20 | MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>"); |
21 | MODULE_DESCRIPTION("Stantum HID multitouch panels"); | |
22 | MODULE_LICENSE("GPL"); | |
23 | ||
24 | #include "hid-ids.h" | |
25 | ||
26 | struct stantum_data { | |
27 | __s32 x, y, z, w, h; /* x, y, pressure, width, height */ | |
28 | __u16 id; /* touch id */ | |
29 | bool valid; /* valid finger data, or just placeholder? */ | |
30 | bool first; /* first finger in the HID packet? */ | |
31 | bool activity; /* at least one active finger so far? */ | |
32 | }; | |
33 | ||
34 | static int stantum_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_INRANGE: | |
64 | case HID_DG_CONFIDENCE: | |
65 | case HID_DG_INPUTMODE: | |
66 | case HID_DG_DEVICEINDEX: | |
67 | case HID_DG_CONTACTCOUNT: | |
68 | case HID_DG_CONTACTMAX: | |
d3fb5454 SC |
69 | return -1; |
70 | ||
71 | case HID_DG_TIPSWITCH: | |
72 | /* touchscreen emulation */ | |
73 | hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH); | |
74 | return 1; | |
75 | ||
76 | case HID_DG_WIDTH: | |
77 | hid_map_usage(hi, usage, bit, max, | |
78 | EV_ABS, ABS_MT_TOUCH_MAJOR); | |
79 | return 1; | |
80 | case HID_DG_HEIGHT: | |
81 | hid_map_usage(hi, usage, bit, max, | |
82 | EV_ABS, ABS_MT_TOUCH_MINOR); | |
83 | input_set_abs_params(hi->input, ABS_MT_ORIENTATION, | |
84 | 1, 1, 0, 0); | |
85 | return 1; | |
580363db SC |
86 | case HID_DG_TIPPRESSURE: |
87 | hid_map_usage(hi, usage, bit, max, | |
88 | EV_ABS, ABS_MT_PRESSURE); | |
89 | return 1; | |
90 | ||
d3fb5454 SC |
91 | case HID_DG_CONTACTID: |
92 | hid_map_usage(hi, usage, bit, max, | |
93 | EV_ABS, ABS_MT_TRACKING_ID); | |
94 | return 1; | |
95 | ||
96 | } | |
97 | return 0; | |
98 | ||
99 | case 0xff000000: | |
100 | /* no input-oriented meaning */ | |
101 | return -1; | |
102 | } | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | static int stantum_input_mapped(struct hid_device *hdev, struct hid_input *hi, | |
108 | struct hid_field *field, struct hid_usage *usage, | |
109 | unsigned long **bit, int *max) | |
110 | { | |
111 | if (usage->type == EV_KEY || usage->type == EV_ABS) | |
112 | clear_bit(usage->code, *bit); | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | /* | |
118 | * this function is called when a whole finger has been parsed, | |
119 | * so that it can decide what to send to the input layer. | |
120 | */ | |
121 | static void stantum_filter_event(struct stantum_data *sd, | |
122 | struct input_dev *input) | |
123 | { | |
124 | bool wide; | |
125 | ||
126 | if (!sd->valid) { | |
127 | /* | |
128 | * touchscreen emulation: if the first finger is not valid and | |
129 | * there previously was finger activity, this is a release | |
130 | */ | |
131 | if (sd->first && sd->activity) { | |
132 | input_event(input, EV_KEY, BTN_TOUCH, 0); | |
133 | sd->activity = false; | |
134 | } | |
135 | return; | |
136 | } | |
137 | ||
138 | input_event(input, EV_ABS, ABS_MT_TRACKING_ID, sd->id); | |
139 | input_event(input, EV_ABS, ABS_MT_POSITION_X, sd->x); | |
140 | input_event(input, EV_ABS, ABS_MT_POSITION_Y, sd->y); | |
141 | ||
142 | wide = (sd->w > sd->h); | |
143 | input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide); | |
144 | input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, wide ? sd->w : sd->h); | |
145 | input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, wide ? sd->h : sd->w); | |
146 | ||
d3fb5454 | 147 | input_event(input, EV_ABS, ABS_MT_PRESSURE, sd->z); |
d3fb5454 SC |
148 | |
149 | input_mt_sync(input); | |
150 | sd->valid = false; | |
d3fb5454 SC |
151 | |
152 | /* touchscreen emulation */ | |
153 | if (sd->first) { | |
154 | if (!sd->activity) { | |
155 | input_event(input, EV_KEY, BTN_TOUCH, 1); | |
156 | sd->activity = true; | |
157 | } | |
158 | input_event(input, EV_ABS, ABS_X, sd->x); | |
159 | input_event(input, EV_ABS, ABS_Y, sd->y); | |
160 | } | |
b32758c7 | 161 | sd->first = false; |
d3fb5454 SC |
162 | } |
163 | ||
164 | ||
165 | static int stantum_event(struct hid_device *hid, struct hid_field *field, | |
166 | struct hid_usage *usage, __s32 value) | |
167 | { | |
168 | struct stantum_data *sd = hid_get_drvdata(hid); | |
169 | ||
170 | if (hid->claimed & HID_CLAIMED_INPUT) { | |
171 | struct input_dev *input = field->hidinput->input; | |
172 | ||
173 | switch (usage->hid) { | |
174 | case HID_DG_INRANGE: | |
175 | /* this is the last field in a finger */ | |
176 | stantum_filter_event(sd, input); | |
177 | break; | |
178 | case HID_DG_WIDTH: | |
179 | sd->w = value; | |
180 | break; | |
181 | case HID_DG_HEIGHT: | |
182 | sd->h = value; | |
183 | break; | |
184 | case HID_GD_X: | |
185 | sd->x = value; | |
186 | break; | |
187 | case HID_GD_Y: | |
188 | sd->y = value; | |
189 | break; | |
190 | case HID_DG_TIPPRESSURE: | |
191 | sd->z = value; | |
192 | break; | |
193 | case HID_DG_CONTACTID: | |
194 | sd->id = value; | |
195 | break; | |
196 | case HID_DG_CONFIDENCE: | |
197 | sd->valid = !!value; | |
198 | break; | |
199 | case 0xff000002: | |
200 | /* this comes only before the first finger */ | |
201 | sd->first = true; | |
202 | break; | |
203 | ||
204 | default: | |
205 | /* ignore the others */ | |
206 | return 1; | |
207 | } | |
208 | } | |
209 | ||
210 | /* we have handled the hidinput part, now remains hiddev */ | |
211 | if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event) | |
212 | hid->hiddev_hid_event(hid, field, usage, value); | |
213 | ||
214 | return 1; | |
215 | } | |
216 | ||
217 | static int stantum_probe(struct hid_device *hdev, | |
218 | const struct hid_device_id *id) | |
219 | { | |
220 | int ret; | |
221 | struct stantum_data *sd; | |
222 | ||
223 | sd = kmalloc(sizeof(struct stantum_data), GFP_KERNEL); | |
224 | if (!sd) { | |
4291ee30 | 225 | hid_err(hdev, "cannot allocate Stantum data\n"); |
d3fb5454 SC |
226 | return -ENOMEM; |
227 | } | |
228 | sd->valid = false; | |
229 | sd->first = false; | |
230 | sd->activity = false; | |
231 | hid_set_drvdata(hdev, sd); | |
232 | ||
233 | ret = hid_parse(hdev); | |
234 | if (!ret) | |
235 | ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); | |
236 | ||
237 | if (ret) | |
238 | kfree(sd); | |
239 | ||
240 | return ret; | |
241 | } | |
242 | ||
243 | static void stantum_remove(struct hid_device *hdev) | |
244 | { | |
245 | hid_hw_stop(hdev); | |
246 | kfree(hid_get_drvdata(hdev)); | |
247 | hid_set_drvdata(hdev, NULL); | |
248 | } | |
249 | ||
250 | static const struct hid_device_id stantum_devices[] = { | |
251 | { HID_USB_DEVICE(USB_VENDOR_ID_STANTUM, USB_DEVICE_ID_MTP) }, | |
b6dc7992 PAS |
252 | { HID_USB_DEVICE(USB_VENDOR_ID_STANTUM_STM, USB_DEVICE_ID_MTP_STM) }, |
253 | { HID_USB_DEVICE(USB_VENDOR_ID_STANTUM_SITRONIX, USB_DEVICE_ID_MTP_SITRONIX) }, | |
d3fb5454 SC |
254 | { } |
255 | }; | |
256 | MODULE_DEVICE_TABLE(hid, stantum_devices); | |
257 | ||
258 | static const struct hid_usage_id stantum_grabbed_usages[] = { | |
259 | { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID }, | |
260 | { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1} | |
261 | }; | |
262 | ||
263 | static struct hid_driver stantum_driver = { | |
264 | .name = "stantum", | |
265 | .id_table = stantum_devices, | |
266 | .probe = stantum_probe, | |
267 | .remove = stantum_remove, | |
268 | .input_mapping = stantum_input_mapping, | |
269 | .input_mapped = stantum_input_mapped, | |
270 | .usage_table = stantum_grabbed_usages, | |
271 | .event = stantum_event, | |
272 | }; | |
273 | ||
274 | static int __init stantum_init(void) | |
275 | { | |
276 | return hid_register_driver(&stantum_driver); | |
277 | } | |
278 | ||
279 | static void __exit stantum_exit(void) | |
280 | { | |
281 | hid_unregister_driver(&stantum_driver); | |
282 | } | |
283 | ||
284 | module_init(stantum_init); | |
285 | module_exit(stantum_exit); | |
286 |