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77f720b7 SC |
1 | /* |
2 | * HID driver for the multitouch panel on the ASUS EeePC T91MT | |
3 | * | |
4 | * Copyright (c) 2009-2010 Stephane Chatty <chatty@enac.fr> | |
5 | * Copyright (c) 2010 Teemu Tuominen <teemu.tuominen@cybercom.com> | |
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> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
77f720b7 SC |
20 | #include <linux/usb.h> |
21 | #include "usbhid/usbhid.h" | |
22 | ||
77f720b7 SC |
23 | MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>"); |
24 | MODULE_DESCRIPTION("MosArt dual-touch panel"); | |
25 | MODULE_LICENSE("GPL"); | |
26 | ||
27 | #include "hid-ids.h" | |
28 | ||
29 | struct mosart_data { | |
30 | __u16 x, y; | |
31 | __u8 id; | |
32 | bool valid; /* valid finger data, or just placeholder? */ | |
33 | bool first; /* is this the first finger in this frame? */ | |
34 | bool activity_now; /* at least one active finger in this frame? */ | |
35 | bool activity; /* at least one active finger previously? */ | |
36 | }; | |
37 | ||
38 | static int mosart_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 | /* touchscreen emulation */ | |
50 | input_set_abs_params(hi->input, ABS_X, | |
51 | field->logical_minimum, | |
52 | field->logical_maximum, 0, 0); | |
53 | return 1; | |
54 | case HID_GD_Y: | |
55 | hid_map_usage(hi, usage, bit, max, | |
56 | EV_ABS, ABS_MT_POSITION_Y); | |
57 | /* touchscreen emulation */ | |
58 | input_set_abs_params(hi->input, ABS_Y, | |
59 | field->logical_minimum, | |
60 | field->logical_maximum, 0, 0); | |
61 | return 1; | |
62 | } | |
63 | return 0; | |
64 | ||
65 | case HID_UP_DIGITIZER: | |
66 | switch (usage->hid) { | |
67 | case HID_DG_CONFIDENCE: | |
68 | case HID_DG_TIPSWITCH: | |
69 | case HID_DG_INPUTMODE: | |
70 | case HID_DG_DEVICEINDEX: | |
71 | case HID_DG_CONTACTCOUNT: | |
72 | case HID_DG_CONTACTMAX: | |
73 | case HID_DG_TIPPRESSURE: | |
74 | case HID_DG_WIDTH: | |
75 | case HID_DG_HEIGHT: | |
76 | return -1; | |
77 | case HID_DG_INRANGE: | |
78 | /* touchscreen emulation */ | |
79 | hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH); | |
80 | return 1; | |
81 | ||
82 | case HID_DG_CONTACTID: | |
83 | hid_map_usage(hi, usage, bit, max, | |
84 | EV_ABS, ABS_MT_TRACKING_ID); | |
85 | return 1; | |
86 | ||
87 | } | |
88 | return 0; | |
89 | ||
90 | case 0xff000000: | |
91 | /* ignore HID features */ | |
92 | return -1; | |
93 | } | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
98 | static int mosart_input_mapped(struct hid_device *hdev, struct hid_input *hi, | |
99 | struct hid_field *field, struct hid_usage *usage, | |
100 | unsigned long **bit, int *max) | |
101 | { | |
102 | if (usage->type == EV_KEY || usage->type == EV_ABS) | |
103 | clear_bit(usage->code, *bit); | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | /* | |
109 | * this function is called when a whole finger has been parsed, | |
110 | * so that it can decide what to send to the input layer. | |
111 | */ | |
112 | static void mosart_filter_event(struct mosart_data *td, struct input_dev *input) | |
113 | { | |
114 | td->first = !td->first; /* touchscreen emulation */ | |
115 | ||
116 | if (!td->valid) { | |
117 | /* | |
118 | * touchscreen emulation: if no finger in this frame is valid | |
119 | * and there previously was finger activity, this is a release | |
120 | */ | |
121 | if (!td->first && !td->activity_now && td->activity) { | |
122 | input_event(input, EV_KEY, BTN_TOUCH, 0); | |
123 | td->activity = false; | |
124 | } | |
125 | return; | |
126 | } | |
127 | ||
128 | input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id); | |
129 | input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x); | |
130 | input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y); | |
131 | ||
132 | input_mt_sync(input); | |
133 | td->valid = false; | |
134 | ||
135 | /* touchscreen emulation: if first active finger in this frame... */ | |
136 | if (!td->activity_now) { | |
137 | /* if there was no previous activity, emit touch event */ | |
138 | if (!td->activity) { | |
139 | input_event(input, EV_KEY, BTN_TOUCH, 1); | |
140 | td->activity = true; | |
141 | } | |
142 | td->activity_now = true; | |
143 | /* and in any case this is our preferred finger */ | |
144 | input_event(input, EV_ABS, ABS_X, td->x); | |
145 | input_event(input, EV_ABS, ABS_Y, td->y); | |
146 | } | |
147 | } | |
148 | ||
149 | ||
150 | static int mosart_event(struct hid_device *hid, struct hid_field *field, | |
151 | struct hid_usage *usage, __s32 value) | |
152 | { | |
153 | struct mosart_data *td = hid_get_drvdata(hid); | |
154 | ||
155 | if (hid->claimed & HID_CLAIMED_INPUT) { | |
156 | struct input_dev *input = field->hidinput->input; | |
157 | switch (usage->hid) { | |
158 | case HID_DG_INRANGE: | |
159 | td->valid = !!value; | |
160 | break; | |
161 | case HID_GD_X: | |
162 | td->x = value; | |
163 | break; | |
164 | case HID_GD_Y: | |
165 | td->y = value; | |
166 | mosart_filter_event(td, input); | |
167 | break; | |
168 | case HID_DG_CONTACTID: | |
169 | td->id = value; | |
170 | break; | |
171 | case HID_DG_CONTACTCOUNT: | |
172 | /* touch emulation: this is the last field in a frame */ | |
173 | td->first = false; | |
174 | td->activity_now = false; | |
175 | break; | |
176 | case HID_DG_CONFIDENCE: | |
177 | case HID_DG_TIPSWITCH: | |
178 | /* avoid interference from generic hidinput handling */ | |
179 | break; | |
180 | ||
181 | default: | |
182 | /* fallback to the generic hidinput handling */ | |
183 | return 0; | |
184 | } | |
185 | } | |
186 | ||
187 | /* we have handled the hidinput part, now remains hiddev */ | |
188 | if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event) | |
189 | hid->hiddev_hid_event(hid, field, usage, value); | |
190 | ||
191 | return 1; | |
192 | } | |
193 | ||
194 | static int mosart_probe(struct hid_device *hdev, const struct hid_device_id *id) | |
195 | { | |
196 | int ret; | |
197 | struct mosart_data *td; | |
198 | ||
199 | ||
200 | td = kmalloc(sizeof(struct mosart_data), GFP_KERNEL); | |
201 | if (!td) { | |
202 | dev_err(&hdev->dev, "cannot allocate MosArt data\n"); | |
203 | return -ENOMEM; | |
204 | } | |
205 | td->valid = false; | |
206 | td->activity = false; | |
207 | td->activity_now = false; | |
208 | td->first = false; | |
209 | hid_set_drvdata(hdev, td); | |
210 | ||
211 | /* currently, it's better to have one evdev device only */ | |
212 | #if 0 | |
213 | hdev->quirks |= HID_QUIRK_MULTI_INPUT; | |
214 | #endif | |
215 | ||
216 | ret = hid_parse(hdev); | |
217 | if (ret == 0) | |
218 | ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); | |
219 | ||
220 | if (ret == 0) { | |
221 | struct hid_report_enum *re = hdev->report_enum | |
222 | + HID_FEATURE_REPORT; | |
223 | struct hid_report *r = re->report_id_hash[7]; | |
224 | ||
225 | r->field[0]->value[0] = 0x02; | |
226 | usbhid_submit_report(hdev, r, USB_DIR_OUT); | |
227 | } else | |
228 | kfree(td); | |
229 | ||
230 | return ret; | |
231 | } | |
232 | ||
233 | static void mosart_remove(struct hid_device *hdev) | |
234 | { | |
235 | hid_hw_stop(hdev); | |
236 | kfree(hid_get_drvdata(hdev)); | |
237 | hid_set_drvdata(hdev, NULL); | |
238 | } | |
239 | ||
240 | static const struct hid_device_id mosart_devices[] = { | |
241 | { HID_USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_T91MT) }, | |
242 | { } | |
243 | }; | |
244 | MODULE_DEVICE_TABLE(hid, mosart_devices); | |
245 | ||
246 | static const struct hid_usage_id mosart_grabbed_usages[] = { | |
247 | { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID }, | |
248 | { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1} | |
249 | }; | |
250 | ||
251 | static struct hid_driver mosart_driver = { | |
252 | .name = "mosart", | |
253 | .id_table = mosart_devices, | |
254 | .probe = mosart_probe, | |
255 | .remove = mosart_remove, | |
256 | .input_mapping = mosart_input_mapping, | |
257 | .input_mapped = mosart_input_mapped, | |
258 | .usage_table = mosart_grabbed_usages, | |
259 | .event = mosart_event, | |
260 | }; | |
261 | ||
262 | static int __init mosart_init(void) | |
263 | { | |
264 | return hid_register_driver(&mosart_driver); | |
265 | } | |
266 | ||
267 | static void __exit mosart_exit(void) | |
268 | { | |
269 | hid_unregister_driver(&mosart_driver); | |
270 | } | |
271 | ||
272 | module_init(mosart_init); | |
273 | module_exit(mosart_exit); | |
274 |