Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
[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         case HID_UP_BUTTON:
95                 /* ignore buttons */
96                 return -1;
97         }
98
99         return 0;
100 }
101
102 static int mosart_input_mapped(struct hid_device *hdev, struct hid_input *hi,
103                 struct hid_field *field, struct hid_usage *usage,
104                 unsigned long **bit, int *max)
105 {
106         if (usage->type == EV_KEY || usage->type == EV_ABS)
107                 clear_bit(usage->code, *bit);
108
109         return 0;
110 }
111
112 /*
113  * this function is called when a whole finger has been parsed,
114  * so that it can decide what to send to the input layer.
115  */
116 static void mosart_filter_event(struct mosart_data *td, struct input_dev *input)
117 {
118         td->first = !td->first; /* touchscreen emulation */
119
120         if (!td->valid) {
121                 /*
122                  * touchscreen emulation: if no finger in this frame is valid
123                  * and there previously was finger activity, this is a release
124                  */ 
125                 if (!td->first && !td->activity_now && td->activity) {
126                         input_event(input, EV_KEY, BTN_TOUCH, 0);
127                         td->activity = false;
128                 }
129                 return;
130         }
131
132         input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id);
133         input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x);
134         input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y);
135
136         input_mt_sync(input);
137         td->valid = false;
138
139         /* touchscreen emulation: if first active finger in this frame... */
140         if (!td->activity_now) {
141                 /* if there was no previous activity, emit touch event */
142                 if (!td->activity) {
143                         input_event(input, EV_KEY, BTN_TOUCH, 1);
144                         td->activity = true;
145                 }
146                 td->activity_now = true;
147                 /* and in any case this is our preferred finger */
148                 input_event(input, EV_ABS, ABS_X, td->x);
149                 input_event(input, EV_ABS, ABS_Y, td->y);
150         }
151 }
152
153
154 static int mosart_event(struct hid_device *hid, struct hid_field *field,
155                                 struct hid_usage *usage, __s32 value)
156 {
157         struct mosart_data *td = hid_get_drvdata(hid);
158
159         if (hid->claimed & HID_CLAIMED_INPUT) {
160                 struct input_dev *input = field->hidinput->input;
161                 switch (usage->hid) {
162                 case HID_DG_INRANGE:
163                         td->valid = !!value;
164                         break;
165                 case HID_GD_X:
166                         td->x = value;
167                         break;
168                 case HID_GD_Y:
169                         td->y = value;
170                         mosart_filter_event(td, input);
171                         break;
172                 case HID_DG_CONTACTID:
173                         td->id = value;
174                         break;
175                 case HID_DG_CONTACTCOUNT:
176                         /* touch emulation: this is the last field in a frame */
177                         td->first = false;
178                         td->activity_now = false;
179                         break;
180                 case HID_DG_CONFIDENCE:
181                 case HID_DG_TIPSWITCH:
182                         /* avoid interference from generic hidinput handling */
183                         break;
184
185                 default:
186                         /* fallback to the generic hidinput handling */
187                         return 0;
188                 }
189         }
190
191         /* we have handled the hidinput part, now remains hiddev */
192         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
193                 hid->hiddev_hid_event(hid, field, usage, value);
194
195         return 1;
196 }
197
198 static int mosart_probe(struct hid_device *hdev, const struct hid_device_id *id)
199 {
200         int ret;
201         struct mosart_data *td;
202
203
204         td = kmalloc(sizeof(struct mosart_data), GFP_KERNEL);
205         if (!td) {
206                 hid_err(hdev, "cannot allocate MosArt data\n");
207                 return -ENOMEM;
208         }
209         td->valid = false;
210         td->activity = false;
211         td->activity_now = false;
212         td->first = false;
213         hid_set_drvdata(hdev, td);
214
215         /* currently, it's better to have one evdev device only */
216 #if 0
217         hdev->quirks |= HID_QUIRK_MULTI_INPUT;
218 #endif
219
220         ret = hid_parse(hdev);
221         if (ret == 0)
222                 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
223
224         if (ret == 0) {
225                 struct hid_report_enum *re = hdev->report_enum
226                                                 + HID_FEATURE_REPORT;
227                 struct hid_report *r = re->report_id_hash[7];
228
229                 r->field[0]->value[0] = 0x02;
230                 usbhid_submit_report(hdev, r, USB_DIR_OUT);
231         } else 
232                 kfree(td);
233
234         return ret;
235 }
236
237 #ifdef CONFIG_PM
238 static int mosart_reset_resume(struct hid_device *hdev)
239 {
240         struct hid_report_enum *re = hdev->report_enum
241                                                 + HID_FEATURE_REPORT;
242         struct hid_report *r = re->report_id_hash[7];
243
244         r->field[0]->value[0] = 0x02;
245         usbhid_submit_report(hdev, r, USB_DIR_OUT);
246         return 0;
247 }
248 #endif
249
250 static void mosart_remove(struct hid_device *hdev)
251 {
252         hid_hw_stop(hdev);
253         kfree(hid_get_drvdata(hdev));
254         hid_set_drvdata(hdev, NULL);
255 }
256
257 static const struct hid_device_id mosart_devices[] = {
258         { HID_USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_T91MT) },
259         { HID_USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUSTEK_MULTITOUCH_YFO) },
260         { HID_USB_DEVICE(USB_VENDOR_ID_TURBOX, USB_DEVICE_ID_TURBOX_TOUCHSCREEN_MOSART) },
261         { }
262 };
263 MODULE_DEVICE_TABLE(hid, mosart_devices);
264
265 static const struct hid_usage_id mosart_grabbed_usages[] = {
266         { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
267         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
268 };
269
270 static struct hid_driver mosart_driver = {
271         .name = "mosart",
272         .id_table = mosart_devices,
273         .probe = mosart_probe,
274         .remove = mosart_remove,
275         .input_mapping = mosart_input_mapping,
276         .input_mapped = mosart_input_mapped,
277         .usage_table = mosart_grabbed_usages,
278         .event = mosart_event,
279 #ifdef CONFIG_PM
280         .reset_resume = mosart_reset_resume,
281 #endif
282 };
283
284 static int __init mosart_init(void)
285 {
286         return hid_register_driver(&mosart_driver);
287 }
288
289 static void __exit mosart_exit(void)
290 {
291         hid_unregister_driver(&mosart_driver);
292 }
293
294 module_init(mosart_init);
295 module_exit(mosart_exit);
296