Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6
[linux-2.6.git] / drivers / hid / hid-mosart.c
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>
19 #include <linux/slab.h>
20 #include <linux/usb.h>
21 #include "usbhid/usbhid.h"
22
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         { HID_USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUSTEK_MULTITOUCH_YFO) },
243         { }
244 };
245 MODULE_DEVICE_TABLE(hid, mosart_devices);
246
247 static 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
252 static 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
263 static int __init mosart_init(void)
264 {
265         return hid_register_driver(&mosart_driver);
266 }
267
268 static void __exit mosart_exit(void)
269 {
270         hid_unregister_driver(&mosart_driver);
271 }
272
273 module_init(mosart_init);
274 module_exit(mosart_exit);
275