Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.git] / drivers / hid / hid-quanta.c
1 /*
2  *  HID driver for Quanta Optical Touch dual-touch panels
3  *
4  *  Copyright (c) 2009-2010 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>
18
19 MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
20 MODULE_DESCRIPTION("Quanta dual-touch panel");
21 MODULE_LICENSE("GPL");
22
23 #include "hid-ids.h"
24
25 struct quanta_data {
26         __u16 x, y;
27         __u8 id;
28         bool valid;             /* valid finger data, or just placeholder? */
29         bool first;             /* is this the first finger in this frame? */
30         bool activity_now;      /* at least one active finger in this frame? */
31         bool activity;          /* at least one active finger previously? */
32 };
33
34 static int quanta_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_CONFIDENCE:
64                 case HID_DG_TIPSWITCH:
65                 case HID_DG_INPUTMODE:
66                 case HID_DG_DEVICEINDEX:
67                 case HID_DG_CONTACTCOUNT:
68                 case HID_DG_CONTACTMAX:
69                 case HID_DG_TIPPRESSURE:
70                 case HID_DG_WIDTH:
71                 case HID_DG_HEIGHT:
72                         return -1;
73                 case HID_DG_INRANGE:
74                         /* touchscreen emulation */
75                         hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
76                         return 1;
77                 case HID_DG_CONTACTID:
78                         hid_map_usage(hi, usage, bit, max,
79                                         EV_ABS, ABS_MT_TRACKING_ID);
80                         return 1;
81                 }
82                 return 0;
83
84         case 0xff000000:
85                 /* ignore vendor-specific features */
86                 return -1;
87         }
88
89         return 0;
90 }
91
92 static int quanta_input_mapped(struct hid_device *hdev, struct hid_input *hi,
93                 struct hid_field *field, struct hid_usage *usage,
94                 unsigned long **bit, int *max)
95 {
96         if (usage->type == EV_KEY || usage->type == EV_ABS)
97                 clear_bit(usage->code, *bit);
98
99         return 0;
100 }
101
102 /*
103  * this function is called when a whole finger has been parsed,
104  * so that it can decide what to send to the input layer.
105  */
106 static void quanta_filter_event(struct quanta_data *td, struct input_dev *input)
107 {
108         
109         td->first = !td->first; /* touchscreen emulation */
110
111         if (!td->valid) {
112                 /*
113                  * touchscreen emulation: if no finger in this frame is valid
114                  * and there previously was finger activity, this is a release
115                  */ 
116                 if (!td->first && !td->activity_now && td->activity) {
117                         input_event(input, EV_KEY, BTN_TOUCH, 0);
118                         td->activity = false;
119                 }
120                 return;
121         }
122
123         input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id);
124         input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x);
125         input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y);
126
127         input_mt_sync(input);
128         td->valid = false;
129
130         /* touchscreen emulation: if first active finger in this frame... */
131         if (!td->activity_now) {
132                 /* if there was no previous activity, emit touch event */
133                 if (!td->activity) {
134                         input_event(input, EV_KEY, BTN_TOUCH, 1);
135                         td->activity = true;
136                 }
137                 td->activity_now = true;
138                 /* and in any case this is our preferred finger */
139                 input_event(input, EV_ABS, ABS_X, td->x);
140                 input_event(input, EV_ABS, ABS_Y, td->y);
141         }
142 }
143
144
145 static int quanta_event(struct hid_device *hid, struct hid_field *field,
146                                 struct hid_usage *usage, __s32 value)
147 {
148         struct quanta_data *td = hid_get_drvdata(hid);
149
150         if (hid->claimed & HID_CLAIMED_INPUT) {
151                 struct input_dev *input = field->hidinput->input;
152
153                 switch (usage->hid) {
154                 case HID_DG_INRANGE:
155                         td->valid = !!value;
156                         break;
157                 case HID_GD_X:
158                         td->x = value;
159                         break;
160                 case HID_GD_Y:
161                         td->y = value;
162                         quanta_filter_event(td, input);
163                         break;
164                 case HID_DG_CONTACTID:
165                         td->id = value;
166                         break;
167                 case HID_DG_CONTACTCOUNT:
168                         /* touch emulation: this is the last field in a frame */
169                         td->first = false;
170                         td->activity_now = false;
171                         break;
172                 case HID_DG_CONFIDENCE:
173                 case HID_DG_TIPSWITCH:
174                         /* avoid interference from generic hidinput handling */
175                         break;
176
177                 default:
178                         /* fallback to the generic hidinput handling */
179                         return 0;
180                 }
181         }
182
183         /* we have handled the hidinput part, now remains hiddev */
184         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
185                 hid->hiddev_hid_event(hid, field, usage, value);
186
187         return 1;
188 }
189
190 static int quanta_probe(struct hid_device *hdev, const struct hid_device_id *id)
191 {
192         int ret;
193         struct quanta_data *td;
194
195         td = kmalloc(sizeof(struct quanta_data), GFP_KERNEL);
196         if (!td) {
197                 dev_err(&hdev->dev, "cannot allocate Quanta Touch data\n");
198                 return -ENOMEM;
199         }
200         td->valid = false;
201         td->activity = false;
202         td->activity_now = false;
203         td->first = false;
204         hid_set_drvdata(hdev, td);
205
206         ret = hid_parse(hdev);
207         if (!ret)
208                 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
209
210         if (ret)
211                 kfree(td);
212
213         return ret;
214 }
215
216 static void quanta_remove(struct hid_device *hdev)
217 {
218         hid_hw_stop(hdev);
219         kfree(hid_get_drvdata(hdev));
220         hid_set_drvdata(hdev, NULL);
221 }
222
223 static const struct hid_device_id quanta_devices[] = {
224         { HID_USB_DEVICE(USB_VENDOR_ID_QUANTA,
225                         USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH) },
226         { HID_USB_DEVICE(USB_VENDOR_ID_QUANTA,
227                         USB_DEVICE_ID_PIXART_IMAGING_INC_OPTICAL_TOUCH_SCREEN) },
228         { }
229 };
230 MODULE_DEVICE_TABLE(hid, quanta_devices);
231
232 static const struct hid_usage_id quanta_grabbed_usages[] = {
233         { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
234         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
235 };
236
237 static struct hid_driver quanta_driver = {
238         .name = "quanta-touch",
239         .id_table = quanta_devices,
240         .probe = quanta_probe,
241         .remove = quanta_remove,
242         .input_mapping = quanta_input_mapping,
243         .input_mapped = quanta_input_mapped,
244         .usage_table = quanta_grabbed_usages,
245         .event = quanta_event,
246 };
247
248 static int __init quanta_init(void)
249 {
250         return hid_register_driver(&quanta_driver);
251 }
252
253 static void __exit quanta_exit(void)
254 {
255         hid_unregister_driver(&quanta_driver);
256 }
257
258 module_init(quanta_init);
259 module_exit(quanta_exit);
260