Merge commit 'v3.4.9' into android-t114-3.4
[linux-2.6.git] / drivers / hid / hid-multitouch.c
1 /*
2  *  HID driver for multitouch panels
3  *
4  *  Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
5  *  Copyright (c) 2010-2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
6  *  Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France
7  *
8  *  This code is partly based on hid-egalax.c:
9  *
10  *  Copyright (c) 2010 Stephane Chatty <chatty@enac.fr>
11  *  Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se>
12  *  Copyright (c) 2010 Canonical, Ltd.
13  *
14  *  This code is partly based on hid-3m-pct.c:
15  *
16  *  Copyright (c) 2009-2010 Stephane Chatty <chatty@enac.fr>
17  *  Copyright (c) 2010      Henrik Rydberg <rydberg@euromail.se>
18  *  Copyright (c) 2010      Canonical, Ltd.
19  *
20  */
21
22 /*
23  * This program is free software; you can redistribute it and/or modify it
24  * under the terms of the GNU General Public License as published by the Free
25  * Software Foundation; either version 2 of the License, or (at your option)
26  * any later version.
27  */
28
29 #include <linux/device.h>
30 #include <linux/hid.h>
31 #include <linux/module.h>
32 #include <linux/slab.h>
33 #include <linux/usb.h>
34 #include <linux/input/mt.h>
35 #include "usbhid/usbhid.h"
36
37
38 MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
39 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
40 MODULE_DESCRIPTION("HID multitouch panels");
41 MODULE_LICENSE("GPL");
42
43 #include "hid-ids.h"
44
45 /* quirks to control the device */
46 #define MT_QUIRK_NOT_SEEN_MEANS_UP      (1 << 0)
47 #define MT_QUIRK_SLOT_IS_CONTACTID      (1 << 1)
48 #define MT_QUIRK_CYPRESS                (1 << 2)
49 #define MT_QUIRK_SLOT_IS_CONTACTNUMBER  (1 << 3)
50 #define MT_QUIRK_ALWAYS_VALID           (1 << 4)
51 #define MT_QUIRK_VALID_IS_INRANGE       (1 << 5)
52 #define MT_QUIRK_VALID_IS_CONFIDENCE    (1 << 6)
53 #define MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE    (1 << 8)
54
55 struct mt_slot {
56         __s32 x, y, p, w, h;
57         __s32 contactid;        /* the device ContactID assigned to this slot */
58         bool touch_state;       /* is the touch valid? */
59         bool seen_in_this_frame;/* has this slot been updated */
60 };
61
62 struct mt_class {
63         __s32 name;     /* MT_CLS */
64         __s32 quirks;
65         __s32 sn_move;  /* Signal/noise ratio for move events */
66         __s32 sn_width; /* Signal/noise ratio for width events */
67         __s32 sn_height;        /* Signal/noise ratio for height events */
68         __s32 sn_pressure;      /* Signal/noise ratio for pressure events */
69         __u8 maxcontacts;
70         bool is_indirect;       /* true for touchpads */
71 };
72
73 struct mt_fields {
74         unsigned usages[HID_MAX_FIELDS];
75         unsigned int length;
76 };
77
78 struct mt_device {
79         struct mt_slot curdata; /* placeholder of incoming data */
80         struct mt_class mtclass;        /* our mt device class */
81         struct mt_fields *fields;       /* temporary placeholder for storing the
82                                            multitouch fields */
83         unsigned last_field_index;      /* last field index of the report */
84         unsigned last_slot_field;       /* the last field of a slot */
85         __s8 inputmode;         /* InputMode HID feature, -1 if non-existent */
86         __s8 maxcontact_report_id;      /* Maximum Contact Number HID feature,
87                                    -1 if non-existent */
88         __u8 num_received;      /* how many contacts we received */
89         __u8 num_expected;      /* expected last contact index */
90         __u8 maxcontacts;
91         __u8 touches_by_report; /* how many touches are present in one report:
92                                 * 1 means we should use a serial protocol
93                                 * > 1 means hybrid (multitouch) protocol */
94         bool curvalid;          /* is the current contact valid? */
95         struct mt_slot *slots;
96 };
97
98 /* classes of device behavior */
99 #define MT_CLS_DEFAULT                          0x0001
100
101 #define MT_CLS_SERIAL                           0x0002
102 #define MT_CLS_CONFIDENCE                       0x0003
103 #define MT_CLS_CONFIDENCE_CONTACT_ID            0x0004
104 #define MT_CLS_CONFIDENCE_MINUS_ONE             0x0005
105 #define MT_CLS_DUAL_INRANGE_CONTACTID           0x0006
106 #define MT_CLS_DUAL_INRANGE_CONTACTNUMBER       0x0007
107 #define MT_CLS_DUAL_NSMU_CONTACTID              0x0008
108 #define MT_CLS_INRANGE_CONTACTNUMBER            0x0009
109
110 /* vendor specific classes */
111 #define MT_CLS_3M                               0x0101
112 #define MT_CLS_CYPRESS                          0x0102
113 #define MT_CLS_EGALAX                           0x0103
114 #define MT_CLS_EGALAX_SERIAL                    0x0104
115 #define MT_CLS_TOPSEED                          0x0105
116 #define MT_CLS_PANASONIC                        0x0106
117
118 #define MT_DEFAULT_MAXCONTACT   10
119
120 /*
121  * these device-dependent functions determine what slot corresponds
122  * to a valid contact that was just read.
123  */
124
125 static int cypress_compute_slot(struct mt_device *td)
126 {
127         if (td->curdata.contactid != 0 || td->num_received == 0)
128                 return td->curdata.contactid;
129         else
130                 return -1;
131 }
132
133 static int find_slot_from_contactid(struct mt_device *td)
134 {
135         int i;
136         for (i = 0; i < td->maxcontacts; ++i) {
137                 if (td->slots[i].contactid == td->curdata.contactid &&
138                         td->slots[i].touch_state)
139                         return i;
140         }
141         for (i = 0; i < td->maxcontacts; ++i) {
142                 if (!td->slots[i].seen_in_this_frame &&
143                         !td->slots[i].touch_state)
144                         return i;
145         }
146         /* should not occurs. If this happens that means
147          * that the device sent more touches that it says
148          * in the report descriptor. It is ignored then. */
149         return -1;
150 }
151
152 static struct mt_class mt_classes[] = {
153         { .name = MT_CLS_DEFAULT,
154                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP },
155         { .name = MT_CLS_SERIAL,
156                 .quirks = MT_QUIRK_ALWAYS_VALID},
157         { .name = MT_CLS_CONFIDENCE,
158                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE },
159         { .name = MT_CLS_CONFIDENCE_CONTACT_ID,
160                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
161                         MT_QUIRK_SLOT_IS_CONTACTID },
162         { .name = MT_CLS_CONFIDENCE_MINUS_ONE,
163                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
164                         MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE },
165         { .name = MT_CLS_DUAL_INRANGE_CONTACTID,
166                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
167                         MT_QUIRK_SLOT_IS_CONTACTID,
168                 .maxcontacts = 2 },
169         { .name = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
170                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
171                         MT_QUIRK_SLOT_IS_CONTACTNUMBER,
172                 .maxcontacts = 2 },
173         { .name = MT_CLS_DUAL_NSMU_CONTACTID,
174                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
175                         MT_QUIRK_SLOT_IS_CONTACTID,
176                 .maxcontacts = 2 },
177         { .name = MT_CLS_INRANGE_CONTACTNUMBER,
178                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
179                         MT_QUIRK_SLOT_IS_CONTACTNUMBER },
180
181         /*
182          * vendor specific classes
183          */
184         { .name = MT_CLS_3M,
185                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
186                         MT_QUIRK_SLOT_IS_CONTACTID,
187                 .sn_move = 2048,
188                 .sn_width = 128,
189                 .sn_height = 128 },
190         { .name = MT_CLS_CYPRESS,
191                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
192                         MT_QUIRK_CYPRESS,
193                 .maxcontacts = 10 },
194         { .name = MT_CLS_EGALAX,
195                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
196                         MT_QUIRK_VALID_IS_INRANGE,
197                 .sn_move = 4096,
198                 .sn_pressure = 32,
199         },
200         { .name = MT_CLS_EGALAX_SERIAL,
201                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
202                         MT_QUIRK_ALWAYS_VALID,
203                 .sn_move = 4096,
204                 .sn_pressure = 32,
205         },
206         { .name = MT_CLS_TOPSEED,
207                 .quirks = MT_QUIRK_ALWAYS_VALID,
208                 .is_indirect = true,
209                 .maxcontacts = 2,
210         },
211         { .name = MT_CLS_PANASONIC,
212                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP,
213                 .maxcontacts = 4 },
214
215         { }
216 };
217
218 static ssize_t mt_show_quirks(struct device *dev,
219                            struct device_attribute *attr,
220                            char *buf)
221 {
222         struct hid_device *hdev = container_of(dev, struct hid_device, dev);
223         struct mt_device *td = hid_get_drvdata(hdev);
224
225         return sprintf(buf, "%u\n", td->mtclass.quirks);
226 }
227
228 static ssize_t mt_set_quirks(struct device *dev,
229                           struct device_attribute *attr,
230                           const char *buf, size_t count)
231 {
232         struct hid_device *hdev = container_of(dev, struct hid_device, dev);
233         struct mt_device *td = hid_get_drvdata(hdev);
234
235         unsigned long val;
236
237         if (kstrtoul(buf, 0, &val))
238                 return -EINVAL;
239
240         td->mtclass.quirks = val;
241
242         return count;
243 }
244
245 static DEVICE_ATTR(quirks, S_IWUSR | S_IRUGO, mt_show_quirks, mt_set_quirks);
246
247 static struct attribute *sysfs_attrs[] = {
248         &dev_attr_quirks.attr,
249         NULL
250 };
251
252 static struct attribute_group mt_attribute_group = {
253         .attrs = sysfs_attrs
254 };
255
256 static void mt_feature_mapping(struct hid_device *hdev,
257                 struct hid_field *field, struct hid_usage *usage)
258 {
259         struct mt_device *td = hid_get_drvdata(hdev);
260
261         switch (usage->hid) {
262         case HID_DG_INPUTMODE:
263                 td->inputmode = field->report->id;
264                 break;
265         case HID_DG_CONTACTMAX:
266                 td->maxcontact_report_id = field->report->id;
267                 td->maxcontacts = field->value[0];
268                 if (td->mtclass.maxcontacts)
269                         /* check if the maxcontacts is given by the class */
270                         td->maxcontacts = td->mtclass.maxcontacts;
271
272                 break;
273         }
274 }
275
276 static void set_abs(struct input_dev *input, unsigned int code,
277                 struct hid_field *field, int snratio)
278 {
279         int fmin = field->logical_minimum;
280         int fmax = field->logical_maximum;
281         int fuzz = snratio ? (fmax - fmin) / snratio : 0;
282         input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
283 }
284
285 static void mt_store_field(struct hid_usage *usage, struct mt_device *td,
286                 struct hid_input *hi)
287 {
288         struct mt_fields *f = td->fields;
289
290         if (f->length >= HID_MAX_FIELDS)
291                 return;
292
293         f->usages[f->length++] = usage->hid;
294 }
295
296 static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
297                 struct hid_field *field, struct hid_usage *usage,
298                 unsigned long **bit, int *max)
299 {
300         struct mt_device *td = hid_get_drvdata(hdev);
301         struct mt_class *cls = &td->mtclass;
302         int code;
303
304         /* Only map fields from TouchScreen or TouchPad collections.
305         * We need to ignore fields that belong to other collections
306         * such as Mouse that might have the same GenericDesktop usages. */
307         if (field->application == HID_DG_TOUCHSCREEN)
308                 set_bit(INPUT_PROP_DIRECT, hi->input->propbit);
309         else if (field->application != HID_DG_TOUCHPAD)
310                 return 0;
311
312         /* In case of an indirect device (touchpad), we need to add
313          * specific BTN_TOOL_* to be handled by the synaptics xorg
314          * driver.
315          * We also consider that touchscreens providing buttons are touchpads.
316          */
317         if (field->application == HID_DG_TOUCHPAD ||
318             (usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON ||
319             cls->is_indirect) {
320                 set_bit(INPUT_PROP_POINTER, hi->input->propbit);
321                 set_bit(BTN_TOOL_FINGER, hi->input->keybit);
322                 set_bit(BTN_TOOL_DOUBLETAP, hi->input->keybit);
323                 set_bit(BTN_TOOL_TRIPLETAP, hi->input->keybit);
324                 set_bit(BTN_TOOL_QUADTAP, hi->input->keybit);
325         }
326
327         /* eGalax devices provide a Digitizer.Stylus input which overrides
328          * the correct Digitizers.Finger X/Y ranges.
329          * Let's just ignore this input. */
330         if (field->physical == HID_DG_STYLUS)
331                 return -1;
332
333         /* Only map fields from TouchScreen or TouchPad collections.
334          * We need to ignore fields that belong to other collections
335          * such as Mouse that might have the same GenericDesktop usages. */
336         if (field->application == HID_DG_TOUCHSCREEN)
337                 set_bit(INPUT_PROP_DIRECT, hi->input->propbit);
338         else if (field->application == HID_DG_TOUCHPAD)
339                 set_bit(INPUT_PROP_POINTER, hi->input->propbit);
340         else
341                 return 0;
342
343         switch (usage->hid & HID_USAGE_PAGE) {
344
345         case HID_UP_GENDESK:
346                 switch (usage->hid) {
347                 case HID_GD_X:
348                         hid_map_usage(hi, usage, bit, max,
349                                         EV_ABS, ABS_MT_POSITION_X);
350                         set_abs(hi->input, ABS_MT_POSITION_X, field,
351                                 cls->sn_move);
352                         /* touchscreen emulation */
353                         set_abs(hi->input, ABS_X, field, cls->sn_move);
354                         mt_store_field(usage, td, hi);
355                         td->last_field_index = field->index;
356                         return 1;
357                 case HID_GD_Y:
358                         hid_map_usage(hi, usage, bit, max,
359                                         EV_ABS, ABS_MT_POSITION_Y);
360                         set_abs(hi->input, ABS_MT_POSITION_Y, field,
361                                 cls->sn_move);
362                         /* touchscreen emulation */
363                         set_abs(hi->input, ABS_Y, field, cls->sn_move);
364                         mt_store_field(usage, td, hi);
365                         td->last_field_index = field->index;
366                         return 1;
367                 }
368                 return 0;
369
370         case HID_UP_DIGITIZER:
371                 switch (usage->hid) {
372                 case HID_DG_INRANGE:
373                         mt_store_field(usage, td, hi);
374                         td->last_field_index = field->index;
375                         return 1;
376                 case HID_DG_CONFIDENCE:
377                         mt_store_field(usage, td, hi);
378                         td->last_field_index = field->index;
379                         return 1;
380                 case HID_DG_TIPSWITCH:
381                         hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
382                         input_set_capability(hi->input, EV_KEY, BTN_TOUCH);
383                         mt_store_field(usage, td, hi);
384                         td->last_field_index = field->index;
385                         return 1;
386                 case HID_DG_CONTACTID:
387                         if (!td->maxcontacts)
388                                 td->maxcontacts = MT_DEFAULT_MAXCONTACT;
389                         input_mt_init_slots(hi->input, td->maxcontacts);
390                         mt_store_field(usage, td, hi);
391                         td->last_field_index = field->index;
392                         td->touches_by_report++;
393                         return 1;
394                 case HID_DG_WIDTH:
395                         hid_map_usage(hi, usage, bit, max,
396                                         EV_ABS, ABS_MT_TOUCH_MAJOR);
397                         set_abs(hi->input, ABS_MT_TOUCH_MAJOR, field,
398                                 cls->sn_width);
399                         mt_store_field(usage, td, hi);
400                         td->last_field_index = field->index;
401                         return 1;
402                 case HID_DG_HEIGHT:
403                         hid_map_usage(hi, usage, bit, max,
404                                         EV_ABS, ABS_MT_TOUCH_MINOR);
405                         set_abs(hi->input, ABS_MT_TOUCH_MINOR, field,
406                                 cls->sn_height);
407                         input_set_abs_params(hi->input,
408                                         ABS_MT_ORIENTATION, 0, 1, 0, 0);
409                         mt_store_field(usage, td, hi);
410                         td->last_field_index = field->index;
411                         return 1;
412                 case HID_DG_TIPPRESSURE:
413                         hid_map_usage(hi, usage, bit, max,
414                                         EV_ABS, ABS_MT_PRESSURE);
415                         set_abs(hi->input, ABS_MT_PRESSURE, field,
416                                 cls->sn_pressure);
417                         /* touchscreen emulation */
418                         set_abs(hi->input, ABS_PRESSURE, field,
419                                 cls->sn_pressure);
420                         mt_store_field(usage, td, hi);
421                         td->last_field_index = field->index;
422                         return 1;
423                 case HID_DG_CONTACTCOUNT:
424                         td->last_field_index = field->index;
425                         return 1;
426                 case HID_DG_CONTACTMAX:
427                         /* we don't set td->last_slot_field as contactcount and
428                          * contact max are global to the report */
429                         td->last_field_index = field->index;
430                         return -1;
431                 }
432                 case HID_DG_TOUCH:
433                         /* Legacy devices use TIPSWITCH and not TOUCH.
434                          * Let's just ignore this field. */
435                         return -1;
436                 /* let hid-input decide for the others */
437                 return 0;
438
439         case HID_UP_BUTTON:
440                 code = BTN_MOUSE + ((usage->hid - 1) & HID_USAGE);
441                 hid_map_usage(hi, usage, bit, max, EV_KEY, code);
442                 input_set_capability(hi->input, EV_KEY, code);
443                 return 1;
444
445         case 0xff000000:
446                 /* we do not want to map these: no input-oriented meaning */
447                 return -1;
448         }
449
450         return 0;
451 }
452
453 static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
454                 struct hid_field *field, struct hid_usage *usage,
455                 unsigned long **bit, int *max)
456 {
457         if (usage->type == EV_KEY || usage->type == EV_ABS)
458                 set_bit(usage->type, hi->input->evbit);
459
460         return -1;
461 }
462
463 static int mt_compute_slot(struct mt_device *td)
464 {
465         __s32 quirks = td->mtclass.quirks;
466
467         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
468                 return td->curdata.contactid;
469
470         if (quirks & MT_QUIRK_CYPRESS)
471                 return cypress_compute_slot(td);
472
473         if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
474                 return td->num_received;
475
476         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE)
477                 return td->curdata.contactid - 1;
478
479         return find_slot_from_contactid(td);
480 }
481
482 /*
483  * this function is called when a whole contact has been processed,
484  * so that it can assign it to a slot and store the data there
485  */
486 static void mt_complete_slot(struct mt_device *td)
487 {
488         td->curdata.seen_in_this_frame = true;
489         if (td->curvalid) {
490                 int slotnum = mt_compute_slot(td);
491
492                 if (slotnum >= 0 && slotnum < td->maxcontacts)
493                         td->slots[slotnum] = td->curdata;
494         }
495         td->num_received++;
496 }
497
498
499 /*
500  * this function is called when a whole packet has been received and processed,
501  * so that it can decide what to send to the input layer.
502  */
503 static void mt_emit_event(struct mt_device *td, struct input_dev *input)
504 {
505         int i;
506
507         for (i = 0; i < td->maxcontacts; ++i) {
508                 struct mt_slot *s = &(td->slots[i]);
509                 if ((td->mtclass.quirks & MT_QUIRK_NOT_SEEN_MEANS_UP) &&
510                         !s->seen_in_this_frame) {
511                         s->touch_state = false;
512                 }
513
514                 input_mt_slot(input, i);
515                 input_mt_report_slot_state(input, MT_TOOL_FINGER,
516                         s->touch_state);
517                 if (s->touch_state) {
518                         /* this finger is on the screen */
519                         int wide = (s->w > s->h);
520                         /* divided by two to match visual scale of touch */
521                         int major = max(s->w, s->h) >> 1;
522                         int minor = min(s->w, s->h) >> 1;
523
524                         input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
525                         input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
526                         input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
527                         input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
528                         input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
529                         input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
530                 }
531                 s->seen_in_this_frame = false;
532
533         }
534
535         input_mt_report_pointer_emulation(input, true);
536         input_sync(input);
537         td->num_received = 0;
538 }
539
540
541
542 static int mt_event(struct hid_device *hid, struct hid_field *field,
543                                 struct hid_usage *usage, __s32 value)
544 {
545         struct mt_device *td = hid_get_drvdata(hid);
546         __s32 quirks = td->mtclass.quirks;
547
548         if (hid->claimed & HID_CLAIMED_INPUT && td->slots) {
549                 switch (usage->hid) {
550                 case HID_DG_INRANGE:
551                         if (quirks & MT_QUIRK_ALWAYS_VALID)
552                                 td->curvalid = true;
553                         else if (quirks & MT_QUIRK_VALID_IS_INRANGE)
554                                 td->curvalid = value;
555                         break;
556                 case HID_DG_TIPSWITCH:
557                         if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
558                                 td->curvalid = value;
559                         td->curdata.touch_state = value;
560                         break;
561                 case HID_DG_CONFIDENCE:
562                         if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
563                                 td->curvalid = value;
564                         break;
565                 case HID_DG_CONTACTID:
566                         td->curdata.contactid = value;
567                         break;
568                 case HID_DG_TIPPRESSURE:
569                         td->curdata.p = value;
570                         break;
571                 case HID_GD_X:
572                         td->curdata.x = value;
573                         break;
574                 case HID_GD_Y:
575                         td->curdata.y = value;
576                         break;
577                 case HID_DG_WIDTH:
578                         td->curdata.w = value;
579                         break;
580                 case HID_DG_HEIGHT:
581                         td->curdata.h = value;
582                         break;
583                 case HID_DG_CONTACTCOUNT:
584                         /*
585                          * Includes multi-packet support where subsequent
586                          * packets are sent with zero contactcount.
587                          */
588                         if (value)
589                                 td->num_expected = value;
590                         break;
591                 case HID_DG_TOUCH:
592                         /* do nothing */
593                         break;
594
595                 default:
596                         /* fallback to the generic hidinput handling */
597                         return 0;
598                 }
599
600                 if (usage->hid == td->last_slot_field)
601                         mt_complete_slot(td);
602
603                 if (field->index == td->last_field_index
604                         && td->num_received >= td->num_expected)
605                         mt_emit_event(td, field->hidinput->input);
606
607         }
608
609         /* we have handled the hidinput part, now remains hiddev */
610         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
611                 hid->hiddev_hid_event(hid, field, usage, value);
612
613         return 1;
614 }
615
616 static void mt_set_input_mode(struct hid_device *hdev)
617 {
618         struct mt_device *td = hid_get_drvdata(hdev);
619         struct hid_report *r;
620         struct hid_report_enum *re;
621
622         if (td->inputmode < 0)
623                 return;
624
625         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
626         r = re->report_id_hash[td->inputmode];
627         if (r) {
628                 r->field[0]->value[0] = 0x02;
629                 usbhid_submit_report(hdev, r, USB_DIR_OUT);
630         }
631 }
632
633 static void mt_set_maxcontacts(struct hid_device *hdev)
634 {
635         struct mt_device *td = hid_get_drvdata(hdev);
636         struct hid_report *r;
637         struct hid_report_enum *re;
638         int fieldmax, max;
639
640         if (td->maxcontact_report_id < 0)
641                 return;
642
643         if (!td->mtclass.maxcontacts)
644                 return;
645
646         re = &hdev->report_enum[HID_FEATURE_REPORT];
647         r = re->report_id_hash[td->maxcontact_report_id];
648         if (r) {
649                 max = td->mtclass.maxcontacts;
650                 fieldmax = r->field[0]->logical_maximum;
651                 max = min(fieldmax, max);
652                 if (r->field[0]->value[0] != max) {
653                         r->field[0]->value[0] = max;
654                         usbhid_submit_report(hdev, r, USB_DIR_OUT);
655                 }
656         }
657 }
658
659 static void mt_post_parse(struct mt_device *td)
660 {
661         struct mt_fields *f = td->fields;
662
663         if (td->touches_by_report > 0) {
664                 int field_count_per_touch = f->length / td->touches_by_report;
665                 td->last_slot_field = f->usages[field_count_per_touch - 1];
666         }
667 }
668
669 static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
670 {
671         int ret, i;
672         struct mt_device *td;
673         struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
674
675         if (id) {
676                 for (i = 0; mt_classes[i].name ; i++) {
677                         if (id->driver_data == mt_classes[i].name) {
678                                 mtclass = &(mt_classes[i]);
679                                 break;
680                         }
681                 }
682         }
683
684         /* This allows the driver to correctly support devices
685          * that emit events over several HID messages.
686          */
687         hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
688         hdev->quirks &= ~HID_QUIRK_MULTITOUCH;
689
690         td = kzalloc(sizeof(struct mt_device), GFP_KERNEL);
691         if (!td) {
692                 dev_err(&hdev->dev, "cannot allocate multitouch data\n");
693                 return -ENOMEM;
694         }
695         td->mtclass = *mtclass;
696         td->inputmode = -1;
697         td->maxcontact_report_id = -1;
698         hid_set_drvdata(hdev, td);
699
700         td->fields = kzalloc(sizeof(struct mt_fields), GFP_KERNEL);
701         if (!td->fields) {
702                 dev_err(&hdev->dev, "cannot allocate multitouch fields data\n");
703                 ret = -ENOMEM;
704                 goto fail;
705         }
706
707         ret = hid_parse(hdev);
708         if (ret != 0)
709                 goto fail;
710
711         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
712         if (ret)
713                 goto fail;
714
715         mt_post_parse(td);
716
717         if (!id && td->touches_by_report == 1) {
718                 /* the device has been sent by hid-generic */
719                 mtclass = &td->mtclass;
720                 mtclass->quirks |= MT_QUIRK_ALWAYS_VALID;
721                 mtclass->quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP;
722                 mtclass->quirks &= ~MT_QUIRK_VALID_IS_INRANGE;
723                 mtclass->quirks &= ~MT_QUIRK_VALID_IS_CONFIDENCE;
724         }
725
726         td->slots = kzalloc(td->maxcontacts * sizeof(struct mt_slot),
727                                 GFP_KERNEL);
728         if (!td->slots) {
729                 dev_err(&hdev->dev, "cannot allocate multitouch slots\n");
730                 hid_hw_stop(hdev);
731                 ret = -ENOMEM;
732                 goto fail;
733         }
734
735         ret = sysfs_create_group(&hdev->dev.kobj, &mt_attribute_group);
736
737         mt_set_maxcontacts(hdev);
738         mt_set_input_mode(hdev);
739
740         kfree(td->fields);
741         td->fields = NULL;
742
743         return 0;
744
745 fail:
746         kfree(td->fields);
747         kfree(td);
748         return ret;
749 }
750
751 #ifdef CONFIG_PM
752 static int mt_reset_resume(struct hid_device *hdev)
753 {
754         mt_set_maxcontacts(hdev);
755         mt_set_input_mode(hdev);
756         return 0;
757 }
758 #endif
759
760 static void mt_remove(struct hid_device *hdev)
761 {
762         struct mt_device *td = hid_get_drvdata(hdev);
763         sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);
764         hid_hw_stop(hdev);
765         kfree(td->slots);
766         kfree(td);
767         hid_set_drvdata(hdev, NULL);
768 }
769
770 static const struct hid_device_id mt_devices[] = {
771
772         /* 3M panels */
773         { .driver_data = MT_CLS_3M,
774                 HID_USB_DEVICE(USB_VENDOR_ID_3M,
775                         USB_DEVICE_ID_3M1968) },
776         { .driver_data = MT_CLS_3M,
777                 HID_USB_DEVICE(USB_VENDOR_ID_3M,
778                         USB_DEVICE_ID_3M2256) },
779         { .driver_data = MT_CLS_3M,
780                 HID_USB_DEVICE(USB_VENDOR_ID_3M,
781                         USB_DEVICE_ID_3M3266) },
782
783         /* ActionStar panels */
784         { .driver_data = MT_CLS_DEFAULT,
785                 HID_USB_DEVICE(USB_VENDOR_ID_ACTIONSTAR,
786                         USB_DEVICE_ID_ACTIONSTAR_1011) },
787
788         /* Atmel panels */
789         { .driver_data = MT_CLS_SERIAL,
790                 HID_USB_DEVICE(USB_VENDOR_ID_ATMEL,
791                         USB_DEVICE_ID_ATMEL_MULTITOUCH) },
792         { .driver_data = MT_CLS_SERIAL,
793                 HID_USB_DEVICE(USB_VENDOR_ID_ATMEL,
794                         USB_DEVICE_ID_ATMEL_MXT_DIGITIZER) },
795
796         /* Baanto multitouch devices */
797         { .driver_data = MT_CLS_DEFAULT,
798                 HID_USB_DEVICE(USB_VENDOR_ID_BAANTO,
799                         USB_DEVICE_ID_BAANTO_MT_190W2) },
800         /* Cando panels */
801         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
802                 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
803                         USB_DEVICE_ID_CANDO_MULTI_TOUCH) },
804         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
805                 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
806                         USB_DEVICE_ID_CANDO_MULTI_TOUCH_10_1) },
807         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
808                 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
809                         USB_DEVICE_ID_CANDO_MULTI_TOUCH_11_6) },
810         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
811                 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
812                         USB_DEVICE_ID_CANDO_MULTI_TOUCH_15_6) },
813
814         /* Chunghwa Telecom touch panels */
815         {  .driver_data = MT_CLS_DEFAULT,
816                 HID_USB_DEVICE(USB_VENDOR_ID_CHUNGHWAT,
817                         USB_DEVICE_ID_CHUNGHWAT_MULTITOUCH) },
818
819         /* CVTouch panels */
820         { .driver_data = MT_CLS_DEFAULT,
821                 HID_USB_DEVICE(USB_VENDOR_ID_CVTOUCH,
822                         USB_DEVICE_ID_CVTOUCH_SCREEN) },
823
824         /* Cypress panel */
825         { .driver_data = MT_CLS_CYPRESS,
826                 HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS,
827                         USB_DEVICE_ID_CYPRESS_TRUETOUCH) },
828
829         /* eGalax devices (resistive) */
830         { .driver_data = MT_CLS_EGALAX,
831                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
832                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480D) },
833         { .driver_data = MT_CLS_EGALAX,
834                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
835                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480E) },
836
837         /* eGalax devices (capacitive) */
838         { .driver_data = MT_CLS_EGALAX,
839                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
840                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_720C) },
841         { .driver_data = MT_CLS_EGALAX_SERIAL,
842                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
843                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7207) },
844         { .driver_data = MT_CLS_EGALAX_SERIAL,
845                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
846                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_725E) },
847         { .driver_data = MT_CLS_EGALAX_SERIAL,
848                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
849                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7224) },
850         { .driver_data = MT_CLS_EGALAX_SERIAL,
851                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
852                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_722A) },
853         { .driver_data = MT_CLS_EGALAX,
854                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
855                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_726B) },
856         { .driver_data = MT_CLS_EGALAX_SERIAL,
857                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
858                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7262) },
859         { .driver_data = MT_CLS_EGALAX,
860                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
861                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72A1) },
862         { .driver_data = MT_CLS_EGALAX_SERIAL,
863                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
864                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72AA) },
865         { .driver_data = MT_CLS_EGALAX,
866                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
867                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72FA) },
868         { .driver_data = MT_CLS_EGALAX,
869                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
870                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7302) },
871         { .driver_data = MT_CLS_EGALAX_SERIAL,
872                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
873                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7349) },
874         { .driver_data = MT_CLS_EGALAX_SERIAL,
875                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
876                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_A001) },
877
878         /* Elo TouchSystems IntelliTouch Plus panel */
879         { .driver_data = MT_CLS_DUAL_NSMU_CONTACTID,
880                 HID_USB_DEVICE(USB_VENDOR_ID_ELO,
881                         USB_DEVICE_ID_ELO_TS2515) },
882
883         /* GeneralTouch panel */
884         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
885                 HID_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
886                         USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS) },
887
888         /* Gametel game controller */
889         { .driver_data = MT_CLS_DEFAULT,
890                 HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_FRUCTEL,
891                         USB_DEVICE_ID_GAMETEL_MT_MODE) },
892
893         /* GoodTouch panels */
894         { .driver_data = MT_CLS_DEFAULT,
895                 HID_USB_DEVICE(USB_VENDOR_ID_GOODTOUCH,
896                         USB_DEVICE_ID_GOODTOUCH_000f) },
897
898         /* Hanvon panels */
899         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
900                 HID_USB_DEVICE(USB_VENDOR_ID_HANVON_ALT,
901                         USB_DEVICE_ID_HANVON_ALT_MULTITOUCH) },
902
903         /* Ideacom panel */
904         { .driver_data = MT_CLS_SERIAL,
905                 HID_USB_DEVICE(USB_VENDOR_ID_IDEACOM,
906                         USB_DEVICE_ID_IDEACOM_IDC6650) },
907         { .driver_data = MT_CLS_SERIAL,
908                 HID_USB_DEVICE(USB_VENDOR_ID_IDEACOM,
909                         USB_DEVICE_ID_IDEACOM_IDC6651) },
910
911         /* Ilitek dual touch panel */
912         {  .driver_data = MT_CLS_DEFAULT,
913                 HID_USB_DEVICE(USB_VENDOR_ID_ILITEK,
914                         USB_DEVICE_ID_ILITEK_MULTITOUCH) },
915
916         /* IRTOUCH panels */
917         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
918                 HID_USB_DEVICE(USB_VENDOR_ID_IRTOUCHSYSTEMS,
919                         USB_DEVICE_ID_IRTOUCH_INFRARED_USB) },
920
921         /* LG Display panels */
922         { .driver_data = MT_CLS_DEFAULT,
923                 HID_USB_DEVICE(USB_VENDOR_ID_LG,
924                         USB_DEVICE_ID_LG_MULTITOUCH) },
925
926         /* Lumio panels */
927         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
928                 HID_USB_DEVICE(USB_VENDOR_ID_LUMIO,
929                         USB_DEVICE_ID_CRYSTALTOUCH) },
930         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
931                 HID_USB_DEVICE(USB_VENDOR_ID_LUMIO,
932                         USB_DEVICE_ID_CRYSTALTOUCH_DUAL) },
933
934         /* MosArt panels */
935         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
936                 HID_USB_DEVICE(USB_VENDOR_ID_ASUS,
937                         USB_DEVICE_ID_ASUS_T91MT)},
938         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
939                 HID_USB_DEVICE(USB_VENDOR_ID_ASUS,
940                         USB_DEVICE_ID_ASUSTEK_MULTITOUCH_YFO) },
941         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
942                 HID_USB_DEVICE(USB_VENDOR_ID_TURBOX,
943                         USB_DEVICE_ID_TURBOX_TOUCHSCREEN_MOSART) },
944
945         /* Panasonic panels */
946         { .driver_data = MT_CLS_PANASONIC,
947                 HID_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
948                         USB_DEVICE_ID_PANABOARD_UBT780) },
949         { .driver_data = MT_CLS_PANASONIC,
950                 HID_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
951                         USB_DEVICE_ID_PANABOARD_UBT880) },
952
953         /* Novatek Panel */
954         { .driver_data = MT_CLS_DEFAULT,
955                 HID_USB_DEVICE(USB_VENDOR_ID_NOVATEK,
956                         USB_DEVICE_ID_NOVATEK_PCT) },
957
958         /* PenMount panels */
959         { .driver_data = MT_CLS_CONFIDENCE,
960                 HID_USB_DEVICE(USB_VENDOR_ID_PENMOUNT,
961                         USB_DEVICE_ID_PENMOUNT_PCI) },
962
963         /* PixArt optical touch screen */
964         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
965                 HID_USB_DEVICE(USB_VENDOR_ID_PIXART,
966                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN) },
967         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
968                 HID_USB_DEVICE(USB_VENDOR_ID_PIXART,
969                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN1) },
970         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
971                 HID_USB_DEVICE(USB_VENDOR_ID_PIXART,
972                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN2) },
973
974         /* PixCir-based panels */
975         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
976                 HID_USB_DEVICE(USB_VENDOR_ID_HANVON,
977                         USB_DEVICE_ID_HANVON_MULTITOUCH) },
978         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
979                 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
980                         USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH) },
981
982         /* Quanta-based panels */
983         { .driver_data = MT_CLS_CONFIDENCE_CONTACT_ID,
984                 HID_USB_DEVICE(USB_VENDOR_ID_QUANTA,
985                         USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH) },
986         { .driver_data = MT_CLS_CONFIDENCE_CONTACT_ID,
987                 HID_USB_DEVICE(USB_VENDOR_ID_QUANTA,
988                         USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3001) },
989         { .driver_data = MT_CLS_CONFIDENCE_CONTACT_ID,
990                 HID_USB_DEVICE(USB_VENDOR_ID_QUANTA,
991                         USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3008) },
992
993         /* Stantum panels */
994         { .driver_data = MT_CLS_CONFIDENCE,
995                 HID_USB_DEVICE(USB_VENDOR_ID_STANTUM,
996                         USB_DEVICE_ID_MTP)},
997         { .driver_data = MT_CLS_CONFIDENCE,
998                 HID_USB_DEVICE(USB_VENDOR_ID_STANTUM_STM,
999                         USB_DEVICE_ID_MTP_STM)},
1000         { .driver_data = MT_CLS_CONFIDENCE,
1001                 HID_USB_DEVICE(USB_VENDOR_ID_STANTUM_SITRONIX,
1002                         USB_DEVICE_ID_MTP_SITRONIX)},
1003
1004         /* TopSeed panels */
1005         { .driver_data = MT_CLS_TOPSEED,
1006                 HID_USB_DEVICE(USB_VENDOR_ID_TOPSEED2,
1007                         USB_DEVICE_ID_TOPSEED2_PERIPAD_701) },
1008
1009         /* Touch International panels */
1010         { .driver_data = MT_CLS_DEFAULT,
1011                 HID_USB_DEVICE(USB_VENDOR_ID_TOUCH_INTL,
1012                         USB_DEVICE_ID_TOUCH_INTL_MULTI_TOUCH) },
1013
1014         /* Unitec panels */
1015         { .driver_data = MT_CLS_DEFAULT,
1016                 HID_USB_DEVICE(USB_VENDOR_ID_UNITEC,
1017                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0709) },
1018         { .driver_data = MT_CLS_DEFAULT,
1019                 HID_USB_DEVICE(USB_VENDOR_ID_UNITEC,
1020                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0A19) },
1021         /* XAT */
1022         { .driver_data = MT_CLS_DEFAULT,
1023                 HID_USB_DEVICE(USB_VENDOR_ID_XAT,
1024                         USB_DEVICE_ID_XAT_CSR) },
1025
1026         /* Xiroku */
1027         { .driver_data = MT_CLS_DEFAULT,
1028                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1029                         USB_DEVICE_ID_XIROKU_SPX) },
1030         { .driver_data = MT_CLS_DEFAULT,
1031                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1032                         USB_DEVICE_ID_XIROKU_MPX) },
1033         { .driver_data = MT_CLS_DEFAULT,
1034                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1035                         USB_DEVICE_ID_XIROKU_CSR) },
1036         { .driver_data = MT_CLS_DEFAULT,
1037                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1038                         USB_DEVICE_ID_XIROKU_SPX1) },
1039         { .driver_data = MT_CLS_DEFAULT,
1040                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1041                         USB_DEVICE_ID_XIROKU_MPX1) },
1042         { .driver_data = MT_CLS_DEFAULT,
1043                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1044                         USB_DEVICE_ID_XIROKU_CSR1) },
1045         { .driver_data = MT_CLS_DEFAULT,
1046                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1047                         USB_DEVICE_ID_XIROKU_SPX2) },
1048         { .driver_data = MT_CLS_DEFAULT,
1049                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1050                         USB_DEVICE_ID_XIROKU_MPX2) },
1051         { .driver_data = MT_CLS_DEFAULT,
1052                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1053                         USB_DEVICE_ID_XIROKU_CSR2) },
1054
1055         { }
1056 };
1057 MODULE_DEVICE_TABLE(hid, mt_devices);
1058
1059 static const struct hid_usage_id mt_grabbed_usages[] = {
1060         { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
1061         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
1062 };
1063
1064 static struct hid_driver mt_driver = {
1065         .name = "hid-multitouch",
1066         .id_table = mt_devices,
1067         .probe = mt_probe,
1068         .remove = mt_remove,
1069         .input_mapping = mt_input_mapping,
1070         .input_mapped = mt_input_mapped,
1071         .feature_mapping = mt_feature_mapping,
1072         .usage_table = mt_grabbed_usages,
1073         .event = mt_event,
1074 #ifdef CONFIG_PM
1075         .reset_resume = mt_reset_resume,
1076 #endif
1077 };
1078
1079 static int __init mt_init(void)
1080 {
1081         return hid_register_driver(&mt_driver);
1082 }
1083
1084 static void __exit mt_exit(void)
1085 {
1086         hid_unregister_driver(&mt_driver);
1087 }
1088
1089 module_init(mt_init);
1090 module_exit(mt_exit);