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Stephane Chatty77f720b2010-02-06 15:17:13 +01001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/slab.h>
Stephane Chatty77f720b2010-02-06 15:17:13 +010020#include <linux/usb.h>
21#include "usbhid/usbhid.h"
22
Stephane Chatty77f720b2010-02-06 15:17:13 +010023MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
24MODULE_DESCRIPTION("MosArt dual-touch panel");
25MODULE_LICENSE("GPL");
26
27#include "hid-ids.h"
28
29struct 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
38static 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
98static 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 */
112static 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
150static 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
194static 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) {
Joe Perches4291ee32010-12-09 19:29:03 -0800202 hid_err(hdev, "cannot allocate MosArt data\n");
Stephane Chatty77f720b2010-02-06 15:17:13 +0100203 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
233static 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
240static const struct hid_device_id mosart_devices[] = {
241 { HID_USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_T91MT) },
Roland Baumcec15a02010-09-08 14:27:55 +0200242 { HID_USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUSTEK_MULTITOUCH_YFO) },
Stephane Chatty77f720b2010-02-06 15:17:13 +0100243 { }
244};
245MODULE_DEVICE_TABLE(hid, mosart_devices);
246
247static const struct hid_usage_id mosart_grabbed_usages[] = {
248 { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
249 { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
250};
251
252static struct hid_driver mosart_driver = {
253 .name = "mosart",
254 .id_table = mosart_devices,
255 .probe = mosart_probe,
256 .remove = mosart_remove,
257 .input_mapping = mosart_input_mapping,
258 .input_mapped = mosart_input_mapped,
259 .usage_table = mosart_grabbed_usages,
260 .event = mosart_event,
261};
262
263static int __init mosart_init(void)
264{
265 return hid_register_driver(&mosart_driver);
266}
267
268static void __exit mosart_exit(void)
269{
270 hid_unregister_driver(&mosart_driver);
271}
272
273module_init(mosart_init);
274module_exit(mosart_exit);
275