include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[linux-2.6.git] / drivers / hid / hid-stantum.c
1 /*
2  *  HID driver for Stantum multitouch panels
3  *
4  *  Copyright (c) 2009 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 #include <linux/slab.h>
19
20 MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
21 MODULE_DESCRIPTION("Stantum HID multitouch panels");
22 MODULE_LICENSE("GPL");
23
24 #include "hid-ids.h"
25
26 struct stantum_data {
27         __s32 x, y, z, w, h;    /* x, y, pressure, width, height */
28         __u16 id;               /* touch id */
29         bool valid;             /* valid finger data, or just placeholder? */
30         bool first;             /* first finger in the HID packet? */
31         bool activity;          /* at least one active finger so far? */
32 };
33
34 static int stantum_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_INRANGE:
64                 case HID_DG_CONFIDENCE:
65                 case HID_DG_INPUTMODE:
66                 case HID_DG_DEVICEINDEX:
67                 case HID_DG_CONTACTCOUNT:
68                 case HID_DG_CONTACTMAX:
69                         return -1;
70
71                 case HID_DG_TIPSWITCH:
72                         /* touchscreen emulation */
73                         hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
74                         return 1;
75
76                 case HID_DG_WIDTH:
77                         hid_map_usage(hi, usage, bit, max,
78                                         EV_ABS, ABS_MT_TOUCH_MAJOR);
79                         return 1;
80                 case HID_DG_HEIGHT:
81                         hid_map_usage(hi, usage, bit, max,
82                                         EV_ABS, ABS_MT_TOUCH_MINOR);
83                         input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
84                                         1, 1, 0, 0);
85                         return 1;
86                 case HID_DG_TIPPRESSURE:
87                         hid_map_usage(hi, usage, bit, max,
88                                         EV_ABS, ABS_MT_PRESSURE);
89                         return 1;
90
91                 case HID_DG_CONTACTID:
92                         hid_map_usage(hi, usage, bit, max,
93                                         EV_ABS, ABS_MT_TRACKING_ID);
94                         return 1;
95
96                 }
97                 return 0;
98
99         case 0xff000000:
100                 /* no input-oriented meaning */
101                 return -1;
102         }
103
104         return 0;
105 }
106
107 static int stantum_input_mapped(struct hid_device *hdev, struct hid_input *hi,
108                 struct hid_field *field, struct hid_usage *usage,
109                 unsigned long **bit, int *max)
110 {
111         if (usage->type == EV_KEY || usage->type == EV_ABS)
112                 clear_bit(usage->code, *bit);
113
114         return 0;
115 }
116
117 /*
118  * this function is called when a whole finger has been parsed,
119  * so that it can decide what to send to the input layer.
120  */
121 static void stantum_filter_event(struct stantum_data *sd,
122                                         struct input_dev *input)
123 {
124         bool wide;
125
126         if (!sd->valid) {
127                 /*
128                  * touchscreen emulation: if the first finger is not valid and
129                  * there previously was finger activity, this is a release
130                  */
131                 if (sd->first && sd->activity) {
132                         input_event(input, EV_KEY, BTN_TOUCH, 0);
133                         sd->activity = false;
134                 }
135                 return;
136         }
137
138         input_event(input, EV_ABS, ABS_MT_TRACKING_ID, sd->id);
139         input_event(input, EV_ABS, ABS_MT_POSITION_X, sd->x);
140         input_event(input, EV_ABS, ABS_MT_POSITION_Y, sd->y);
141
142         wide = (sd->w > sd->h);
143         input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
144         input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, wide ? sd->w : sd->h);
145         input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, wide ? sd->h : sd->w);
146
147         input_event(input, EV_ABS, ABS_MT_PRESSURE, sd->z);
148
149         input_mt_sync(input);
150         sd->valid = false;
151
152         /* touchscreen emulation */
153         if (sd->first) {
154                 if (!sd->activity) {
155                         input_event(input, EV_KEY, BTN_TOUCH, 1);
156                         sd->activity = true;
157                 }
158                 input_event(input, EV_ABS, ABS_X, sd->x);
159                 input_event(input, EV_ABS, ABS_Y, sd->y);
160         }
161         sd->first = false;
162 }
163
164
165 static int stantum_event(struct hid_device *hid, struct hid_field *field,
166                                 struct hid_usage *usage, __s32 value)
167 {
168         struct stantum_data *sd = hid_get_drvdata(hid);
169
170         if (hid->claimed & HID_CLAIMED_INPUT) {
171                 struct input_dev *input = field->hidinput->input;
172
173                 switch (usage->hid) {
174                 case HID_DG_INRANGE:
175                         /* this is the last field in a finger */
176                         stantum_filter_event(sd, input);
177                         break;
178                 case HID_DG_WIDTH:
179                         sd->w = value;
180                         break;
181                 case HID_DG_HEIGHT:
182                         sd->h = value;
183                         break;
184                 case HID_GD_X:
185                         sd->x = value;
186                         break;
187                 case HID_GD_Y:
188                         sd->y = value;
189                         break;
190                 case HID_DG_TIPPRESSURE:
191                         sd->z = value;
192                         break;
193                 case HID_DG_CONTACTID:
194                         sd->id = value;
195                         break;
196                 case HID_DG_CONFIDENCE:
197                         sd->valid = !!value;
198                         break;
199                 case 0xff000002:
200                         /* this comes only before the first finger */
201                         sd->first = true;
202                         break;
203
204                 default:
205                         /* ignore the others */
206                         return 1;
207                 }
208         }
209
210         /* we have handled the hidinput part, now remains hiddev */
211         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
212                 hid->hiddev_hid_event(hid, field, usage, value);
213
214         return 1;
215 }
216
217 static int stantum_probe(struct hid_device *hdev,
218                                 const struct hid_device_id *id)
219 {
220         int ret;
221         struct stantum_data *sd;
222
223         sd = kmalloc(sizeof(struct stantum_data), GFP_KERNEL);
224         if (!sd) {
225                 dev_err(&hdev->dev, "cannot allocate Stantum data\n");
226                 return -ENOMEM;
227         }
228         sd->valid = false;
229         sd->first = false;
230         sd->activity = false;
231         hid_set_drvdata(hdev, sd);
232
233         ret = hid_parse(hdev);
234         if (!ret)
235                 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
236
237         if (ret)
238                 kfree(sd);
239
240         return ret;
241 }
242
243 static void stantum_remove(struct hid_device *hdev)
244 {
245         hid_hw_stop(hdev);
246         kfree(hid_get_drvdata(hdev));
247         hid_set_drvdata(hdev, NULL);
248 }
249
250 static const struct hid_device_id stantum_devices[] = {
251         { HID_USB_DEVICE(USB_VENDOR_ID_STANTUM, USB_DEVICE_ID_MTP) },
252         { }
253 };
254 MODULE_DEVICE_TABLE(hid, stantum_devices);
255
256 static const struct hid_usage_id stantum_grabbed_usages[] = {
257         { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
258         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
259 };
260
261 static struct hid_driver stantum_driver = {
262         .name = "stantum",
263         .id_table = stantum_devices,
264         .probe = stantum_probe,
265         .remove = stantum_remove,
266         .input_mapping = stantum_input_mapping,
267         .input_mapped = stantum_input_mapped,
268         .usage_table = stantum_grabbed_usages,
269         .event = stantum_event,
270 };
271
272 static int __init stantum_init(void)
273 {
274         return hid_register_driver(&stantum_driver);
275 }
276
277 static void __exit stantum_exit(void)
278 {
279         hid_unregister_driver(&stantum_driver);
280 }
281
282 module_init(stantum_init);
283 module_exit(stantum_exit);
284