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Linux/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) 2010-2013 Benjamin Tissoires <benjamin.tissoires@gmail.com>
  6  *  Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France
  7  *  Copyright (c) 2012-2013 Red Hat, Inc
  8  *
  9  *  This code is partly based on hid-egalax.c:
 10  *
 11  *  Copyright (c) 2010 Stephane Chatty <chatty@enac.fr>
 12  *  Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se>
 13  *  Copyright (c) 2010 Canonical, Ltd.
 14  *
 15  *  This code is partly based on hid-3m-pct.c:
 16  *
 17  *  Copyright (c) 2009-2010 Stephane Chatty <chatty@enac.fr>
 18  *  Copyright (c) 2010      Henrik Rydberg <rydberg@euromail.se>
 19  *  Copyright (c) 2010      Canonical, Ltd.
 20  *
 21  */
 22 
 23 /*
 24  * This program is free software; you can redistribute it and/or modify it
 25  * under the terms of the GNU General Public License as published by the Free
 26  * Software Foundation; either version 2 of the License, or (at your option)
 27  * any later version.
 28  */
 29 
 30 /*
 31  * This driver is regularly tested thanks to the tool hid-test[1].
 32  * This tool relies on hid-replay[2] and a database of hid devices[3].
 33  * Please run these regression tests before patching this module so that
 34  * your patch won't break existing known devices.
 35  *
 36  * [1] https://github.com/bentiss/hid-test
 37  * [2] https://github.com/bentiss/hid-replay
 38  * [3] https://github.com/bentiss/hid-devices
 39  */
 40 
 41 #include <linux/device.h>
 42 #include <linux/hid.h>
 43 #include <linux/module.h>
 44 #include <linux/slab.h>
 45 #include <linux/input/mt.h>
 46 #include <linux/string.h>
 47 
 48 
 49 MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
 50 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
 51 MODULE_DESCRIPTION("HID multitouch panels");
 52 MODULE_LICENSE("GPL");
 53 
 54 #include "hid-ids.h"
 55 
 56 /* quirks to control the device */
 57 #define MT_QUIRK_NOT_SEEN_MEANS_UP      (1 << 0)
 58 #define MT_QUIRK_SLOT_IS_CONTACTID      (1 << 1)
 59 #define MT_QUIRK_CYPRESS                (1 << 2)
 60 #define MT_QUIRK_SLOT_IS_CONTACTNUMBER  (1 << 3)
 61 #define MT_QUIRK_ALWAYS_VALID           (1 << 4)
 62 #define MT_QUIRK_VALID_IS_INRANGE       (1 << 5)
 63 #define MT_QUIRK_VALID_IS_CONFIDENCE    (1 << 6)
 64 #define MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE    (1 << 8)
 65 #define MT_QUIRK_NO_AREA                (1 << 9)
 66 #define MT_QUIRK_IGNORE_DUPLICATES      (1 << 10)
 67 #define MT_QUIRK_HOVERING               (1 << 11)
 68 #define MT_QUIRK_CONTACT_CNT_ACCURATE   (1 << 12)
 69 #define MT_QUIRK_FORCE_GET_FEATURE      (1 << 13)
 70 
 71 #define MT_INPUTMODE_TOUCHSCREEN        0x02
 72 #define MT_INPUTMODE_TOUCHPAD           0x03
 73 
 74 #define MT_BUTTONTYPE_CLICKPAD          0
 75 
 76 struct mt_slot {
 77         __s32 x, y, cx, cy, p, w, h;
 78         __s32 contactid;        /* the device ContactID assigned to this slot */
 79         bool touch_state;       /* is the touch valid? */
 80         bool inrange_state;     /* is the finger in proximity of the sensor? */
 81 };
 82 
 83 struct mt_class {
 84         __s32 name;     /* MT_CLS */
 85         __s32 quirks;
 86         __s32 sn_move;  /* Signal/noise ratio for move events */
 87         __s32 sn_width; /* Signal/noise ratio for width events */
 88         __s32 sn_height;        /* Signal/noise ratio for height events */
 89         __s32 sn_pressure;      /* Signal/noise ratio for pressure events */
 90         __u8 maxcontacts;
 91         bool is_indirect;       /* true for touchpads */
 92         bool export_all_inputs; /* do not ignore mouse, keyboards, etc... */
 93 };
 94 
 95 struct mt_fields {
 96         unsigned usages[HID_MAX_FIELDS];
 97         unsigned int length;
 98 };
 99 
100 struct mt_device {
101         struct mt_slot curdata; /* placeholder of incoming data */
102         struct mt_class mtclass;        /* our mt device class */
103         struct mt_fields *fields;       /* temporary placeholder for storing the
104                                            multitouch fields */
105         int cc_index;   /* contact count field index in the report */
106         int cc_value_index;     /* contact count value index in the field */
107         unsigned last_slot_field;       /* the last field of a slot */
108         unsigned mt_report_id;  /* the report ID of the multitouch device */
109         __s16 inputmode;        /* InputMode HID feature, -1 if non-existent */
110         __s16 inputmode_index;  /* InputMode HID feature index in the report */
111         __s16 maxcontact_report_id;     /* Maximum Contact Number HID feature,
112                                    -1 if non-existent */
113         __u8 inputmode_value;  /* InputMode HID feature value */
114         __u8 num_received;      /* how many contacts we received */
115         __u8 num_expected;      /* expected last contact index */
116         __u8 maxcontacts;
117         __u8 touches_by_report; /* how many touches are present in one report:
118                                 * 1 means we should use a serial protocol
119                                 * > 1 means hybrid (multitouch) protocol */
120         __u8 buttons_count;     /* number of physical buttons per touchpad */
121         bool is_buttonpad;      /* is this device a button pad? */
122         bool serial_maybe;      /* need to check for serial protocol */
123         bool curvalid;          /* is the current contact valid? */
124         unsigned mt_flags;      /* flags to pass to input-mt */
125 };
126 
127 static void mt_post_parse_default_settings(struct mt_device *td);
128 static void mt_post_parse(struct mt_device *td);
129 
130 /* classes of device behavior */
131 #define MT_CLS_DEFAULT                          0x0001
132 
133 #define MT_CLS_SERIAL                           0x0002
134 #define MT_CLS_CONFIDENCE                       0x0003
135 #define MT_CLS_CONFIDENCE_CONTACT_ID            0x0004
136 #define MT_CLS_CONFIDENCE_MINUS_ONE             0x0005
137 #define MT_CLS_DUAL_INRANGE_CONTACTID           0x0006
138 #define MT_CLS_DUAL_INRANGE_CONTACTNUMBER       0x0007
139 /* reserved                                     0x0008 */
140 #define MT_CLS_INRANGE_CONTACTNUMBER            0x0009
141 #define MT_CLS_NSMU                             0x000a
142 /* reserved                                     0x0010 */
143 /* reserved                                     0x0011 */
144 #define MT_CLS_WIN_8                            0x0012
145 #define MT_CLS_EXPORT_ALL_INPUTS                0x0013
146 
147 /* vendor specific classes */
148 #define MT_CLS_3M                               0x0101
149 /* reserved                                     0x0102 */
150 #define MT_CLS_EGALAX                           0x0103
151 #define MT_CLS_EGALAX_SERIAL                    0x0104
152 #define MT_CLS_TOPSEED                          0x0105
153 #define MT_CLS_PANASONIC                        0x0106
154 #define MT_CLS_FLATFROG                         0x0107
155 #define MT_CLS_GENERALTOUCH_TWOFINGERS          0x0108
156 #define MT_CLS_GENERALTOUCH_PWT_TENFINGERS      0x0109
157 #define MT_CLS_VTL                              0x0110
158 
159 #define MT_DEFAULT_MAXCONTACT   10
160 #define MT_MAX_MAXCONTACT       250
161 
162 #define MT_USB_DEVICE(v, p)     HID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH, v, p)
163 #define MT_BT_DEVICE(v, p)      HID_DEVICE(BUS_BLUETOOTH, HID_GROUP_MULTITOUCH, v, p)
164 
165 /*
166  * these device-dependent functions determine what slot corresponds
167  * to a valid contact that was just read.
168  */
169 
170 static int cypress_compute_slot(struct mt_device *td)
171 {
172         if (td->curdata.contactid != 0 || td->num_received == 0)
173                 return td->curdata.contactid;
174         else
175                 return -1;
176 }
177 
178 static struct mt_class mt_classes[] = {
179         { .name = MT_CLS_DEFAULT,
180                 .quirks = MT_QUIRK_ALWAYS_VALID |
181                         MT_QUIRK_CONTACT_CNT_ACCURATE },
182         { .name = MT_CLS_NSMU,
183                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP },
184         { .name = MT_CLS_SERIAL,
185                 .quirks = MT_QUIRK_ALWAYS_VALID},
186         { .name = MT_CLS_CONFIDENCE,
187                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE },
188         { .name = MT_CLS_CONFIDENCE_CONTACT_ID,
189                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
190                         MT_QUIRK_SLOT_IS_CONTACTID },
191         { .name = MT_CLS_CONFIDENCE_MINUS_ONE,
192                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
193                         MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE },
194         { .name = MT_CLS_DUAL_INRANGE_CONTACTID,
195                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
196                         MT_QUIRK_SLOT_IS_CONTACTID,
197                 .maxcontacts = 2 },
198         { .name = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
199                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
200                         MT_QUIRK_SLOT_IS_CONTACTNUMBER,
201                 .maxcontacts = 2 },
202         { .name = MT_CLS_INRANGE_CONTACTNUMBER,
203                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
204                         MT_QUIRK_SLOT_IS_CONTACTNUMBER },
205         { .name = MT_CLS_WIN_8,
206                 .quirks = MT_QUIRK_ALWAYS_VALID |
207                         MT_QUIRK_IGNORE_DUPLICATES |
208                         MT_QUIRK_HOVERING |
209                         MT_QUIRK_CONTACT_CNT_ACCURATE },
210         { .name = MT_CLS_EXPORT_ALL_INPUTS,
211                 .quirks = MT_QUIRK_ALWAYS_VALID |
212                         MT_QUIRK_CONTACT_CNT_ACCURATE,
213                 .export_all_inputs = true },
214 
215         /*
216          * vendor specific classes
217          */
218         { .name = MT_CLS_3M,
219                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
220                         MT_QUIRK_SLOT_IS_CONTACTID,
221                 .sn_move = 2048,
222                 .sn_width = 128,
223                 .sn_height = 128,
224                 .maxcontacts = 60,
225         },
226         { .name = MT_CLS_EGALAX,
227                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
228                         MT_QUIRK_VALID_IS_INRANGE,
229                 .sn_move = 4096,
230                 .sn_pressure = 32,
231         },
232         { .name = MT_CLS_EGALAX_SERIAL,
233                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
234                         MT_QUIRK_ALWAYS_VALID,
235                 .sn_move = 4096,
236                 .sn_pressure = 32,
237         },
238         { .name = MT_CLS_TOPSEED,
239                 .quirks = MT_QUIRK_ALWAYS_VALID,
240                 .is_indirect = true,
241                 .maxcontacts = 2,
242         },
243         { .name = MT_CLS_PANASONIC,
244                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP,
245                 .maxcontacts = 4 },
246         { .name = MT_CLS_GENERALTOUCH_TWOFINGERS,
247                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
248                         MT_QUIRK_VALID_IS_INRANGE |
249                         MT_QUIRK_SLOT_IS_CONTACTID,
250                 .maxcontacts = 2
251         },
252         { .name = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
253                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
254                         MT_QUIRK_SLOT_IS_CONTACTID
255         },
256 
257         { .name = MT_CLS_FLATFROG,
258                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
259                         MT_QUIRK_NO_AREA,
260                 .sn_move = 2048,
261                 .maxcontacts = 40,
262         },
263         { .name = MT_CLS_VTL,
264                 .quirks = MT_QUIRK_ALWAYS_VALID |
265                         MT_QUIRK_CONTACT_CNT_ACCURATE |
266                         MT_QUIRK_FORCE_GET_FEATURE,
267         },
268         { }
269 };
270 
271 static ssize_t mt_show_quirks(struct device *dev,
272                            struct device_attribute *attr,
273                            char *buf)
274 {
275         struct hid_device *hdev = to_hid_device(dev);
276         struct mt_device *td = hid_get_drvdata(hdev);
277 
278         return sprintf(buf, "%u\n", td->mtclass.quirks);
279 }
280 
281 static ssize_t mt_set_quirks(struct device *dev,
282                           struct device_attribute *attr,
283                           const char *buf, size_t count)
284 {
285         struct hid_device *hdev = to_hid_device(dev);
286         struct mt_device *td = hid_get_drvdata(hdev);
287 
288         unsigned long val;
289 
290         if (kstrtoul(buf, 0, &val))
291                 return -EINVAL;
292 
293         td->mtclass.quirks = val;
294 
295         if (td->cc_index < 0)
296                 td->mtclass.quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
297 
298         return count;
299 }
300 
301 static DEVICE_ATTR(quirks, S_IWUSR | S_IRUGO, mt_show_quirks, mt_set_quirks);
302 
303 static struct attribute *sysfs_attrs[] = {
304         &dev_attr_quirks.attr,
305         NULL
306 };
307 
308 static struct attribute_group mt_attribute_group = {
309         .attrs = sysfs_attrs
310 };
311 
312 static void mt_get_feature(struct hid_device *hdev, struct hid_report *report)
313 {
314         struct mt_device *td = hid_get_drvdata(hdev);
315         int ret, size = hid_report_len(report);
316         u8 *buf;
317 
318         /*
319          * Only fetch the feature report if initial reports are not already
320          * been retrieved. Currently this is only done for Windows 8 touch
321          * devices.
322          */
323         if (!(hdev->quirks & HID_QUIRK_NO_INIT_REPORTS))
324                 return;
325         if (td->mtclass.name != MT_CLS_WIN_8)
326                 return;
327 
328         buf = hid_alloc_report_buf(report, GFP_KERNEL);
329         if (!buf)
330                 return;
331 
332         ret = hid_hw_raw_request(hdev, report->id, buf, size,
333                                  HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
334         if (ret < 0) {
335                 dev_warn(&hdev->dev, "failed to fetch feature %d\n",
336                          report->id);
337         } else {
338                 ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT, buf,
339                                            size, 0);
340                 if (ret)
341                         dev_warn(&hdev->dev, "failed to report feature\n");
342         }
343 
344         kfree(buf);
345 }
346 
347 static void mt_feature_mapping(struct hid_device *hdev,
348                 struct hid_field *field, struct hid_usage *usage)
349 {
350         struct mt_device *td = hid_get_drvdata(hdev);
351 
352         switch (usage->hid) {
353         case HID_DG_INPUTMODE:
354                 /* Ignore if value index is out of bounds. */
355                 if (usage->usage_index >= field->report_count) {
356                         dev_err(&hdev->dev, "HID_DG_INPUTMODE out of range\n");
357                         break;
358                 }
359 
360                 if (td->inputmode < 0) {
361                         td->inputmode = field->report->id;
362                         td->inputmode_index = usage->usage_index;
363                 } else {
364                         /*
365                          * Some elan panels wrongly declare 2 input mode
366                          * features, and silently ignore when we set the
367                          * value in the second field. Skip the second feature
368                          * and hope for the best.
369                          */
370                         dev_info(&hdev->dev,
371                                  "Ignoring the extra HID_DG_INPUTMODE\n");
372                 }
373 
374                 break;
375         case HID_DG_CONTACTMAX:
376                 mt_get_feature(hdev, field->report);
377 
378                 td->maxcontact_report_id = field->report->id;
379                 td->maxcontacts = field->value[0];
380                 if (!td->maxcontacts &&
381                     field->logical_maximum <= MT_MAX_MAXCONTACT)
382                         td->maxcontacts = field->logical_maximum;
383                 if (td->mtclass.maxcontacts)
384                         /* check if the maxcontacts is given by the class */
385                         td->maxcontacts = td->mtclass.maxcontacts;
386 
387                 break;
388         case HID_DG_BUTTONTYPE:
389                 if (usage->usage_index >= field->report_count) {
390                         dev_err(&hdev->dev, "HID_DG_BUTTONTYPE out of range\n");
391                         break;
392                 }
393 
394                 mt_get_feature(hdev, field->report);
395                 if (field->value[usage->usage_index] == MT_BUTTONTYPE_CLICKPAD)
396                         td->is_buttonpad = true;
397 
398                 break;
399         case 0xff0000c5:
400                 /* Retrieve the Win8 blob once to enable some devices */
401                 if (usage->usage_index == 0)
402                         mt_get_feature(hdev, field->report);
403                 break;
404         }
405 }
406 
407 static void set_abs(struct input_dev *input, unsigned int code,
408                 struct hid_field *field, int snratio)
409 {
410         int fmin = field->logical_minimum;
411         int fmax = field->logical_maximum;
412         int fuzz = snratio ? (fmax - fmin) / snratio : 0;
413         input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
414         input_abs_set_res(input, code, hidinput_calc_abs_res(field, code));
415 }
416 
417 static void mt_store_field(struct hid_usage *usage, struct mt_device *td,
418                 struct hid_input *hi)
419 {
420         struct mt_fields *f = td->fields;
421 
422         if (f->length >= HID_MAX_FIELDS)
423                 return;
424 
425         f->usages[f->length++] = usage->hid;
426 }
427 
428 static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
429                 struct hid_field *field, struct hid_usage *usage,
430                 unsigned long **bit, int *max)
431 {
432         struct mt_device *td = hid_get_drvdata(hdev);
433         struct mt_class *cls = &td->mtclass;
434         int code;
435         struct hid_usage *prev_usage = NULL;
436 
437         if (field->application == HID_DG_TOUCHSCREEN)
438                 td->mt_flags |= INPUT_MT_DIRECT;
439 
440         /*
441          * Model touchscreens providing buttons as touchpads.
442          */
443         if (field->application == HID_DG_TOUCHPAD ||
444             (usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON) {
445                 td->mt_flags |= INPUT_MT_POINTER;
446                 td->inputmode_value = MT_INPUTMODE_TOUCHPAD;
447         }
448 
449         /* count the buttons on touchpads */
450         if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON)
451                 td->buttons_count++;
452 
453         if (usage->usage_index)
454                 prev_usage = &field->usage[usage->usage_index - 1];
455 
456         switch (usage->hid & HID_USAGE_PAGE) {
457 
458         case HID_UP_GENDESK:
459                 switch (usage->hid) {
460                 case HID_GD_X:
461                         if (prev_usage && (prev_usage->hid == usage->hid)) {
462                                 hid_map_usage(hi, usage, bit, max,
463                                         EV_ABS, ABS_MT_TOOL_X);
464                                 set_abs(hi->input, ABS_MT_TOOL_X, field,
465                                         cls->sn_move);
466                         } else {
467                                 hid_map_usage(hi, usage, bit, max,
468                                         EV_ABS, ABS_MT_POSITION_X);
469                                 set_abs(hi->input, ABS_MT_POSITION_X, field,
470                                         cls->sn_move);
471                         }
472 
473                         mt_store_field(usage, td, hi);
474                         return 1;
475                 case HID_GD_Y:
476                         if (prev_usage && (prev_usage->hid == usage->hid)) {
477                                 hid_map_usage(hi, usage, bit, max,
478                                         EV_ABS, ABS_MT_TOOL_Y);
479                                 set_abs(hi->input, ABS_MT_TOOL_Y, field,
480                                         cls->sn_move);
481                         } else {
482                                 hid_map_usage(hi, usage, bit, max,
483                                         EV_ABS, ABS_MT_POSITION_Y);
484                                 set_abs(hi->input, ABS_MT_POSITION_Y, field,
485                                         cls->sn_move);
486                         }
487 
488                         mt_store_field(usage, td, hi);
489                         return 1;
490                 }
491                 return 0;
492 
493         case HID_UP_DIGITIZER:
494                 switch (usage->hid) {
495                 case HID_DG_INRANGE:
496                         if (cls->quirks & MT_QUIRK_HOVERING) {
497                                 hid_map_usage(hi, usage, bit, max,
498                                         EV_ABS, ABS_MT_DISTANCE);
499                                 input_set_abs_params(hi->input,
500                                         ABS_MT_DISTANCE, 0, 1, 0, 0);
501                         }
502                         mt_store_field(usage, td, hi);
503                         return 1;
504                 case HID_DG_CONFIDENCE:
505                         if (cls->name == MT_CLS_WIN_8 &&
506                                 field->application == HID_DG_TOUCHPAD) {
507                                 cls->quirks &= ~MT_QUIRK_ALWAYS_VALID;
508                                 cls->quirks |= MT_QUIRK_VALID_IS_CONFIDENCE;
509                         }
510                         mt_store_field(usage, td, hi);
511                         return 1;
512                 case HID_DG_TIPSWITCH:
513                         hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
514                         input_set_capability(hi->input, EV_KEY, BTN_TOUCH);
515                         mt_store_field(usage, td, hi);
516                         return 1;
517                 case HID_DG_CONTACTID:
518                         mt_store_field(usage, td, hi);
519                         td->touches_by_report++;
520                         td->mt_report_id = field->report->id;
521                         return 1;
522                 case HID_DG_WIDTH:
523                         hid_map_usage(hi, usage, bit, max,
524                                         EV_ABS, ABS_MT_TOUCH_MAJOR);
525                         if (!(cls->quirks & MT_QUIRK_NO_AREA))
526                                 set_abs(hi->input, ABS_MT_TOUCH_MAJOR, field,
527                                         cls->sn_width);
528                         mt_store_field(usage, td, hi);
529                         return 1;
530                 case HID_DG_HEIGHT:
531                         hid_map_usage(hi, usage, bit, max,
532                                         EV_ABS, ABS_MT_TOUCH_MINOR);
533                         if (!(cls->quirks & MT_QUIRK_NO_AREA)) {
534                                 set_abs(hi->input, ABS_MT_TOUCH_MINOR, field,
535                                         cls->sn_height);
536                                 input_set_abs_params(hi->input,
537                                         ABS_MT_ORIENTATION, 0, 1, 0, 0);
538                         }
539                         mt_store_field(usage, td, hi);
540                         return 1;
541                 case HID_DG_TIPPRESSURE:
542                         hid_map_usage(hi, usage, bit, max,
543                                         EV_ABS, ABS_MT_PRESSURE);
544                         set_abs(hi->input, ABS_MT_PRESSURE, field,
545                                 cls->sn_pressure);
546                         mt_store_field(usage, td, hi);
547                         return 1;
548                 case HID_DG_CONTACTCOUNT:
549                         /* Ignore if indexes are out of bounds. */
550                         if (field->index >= field->report->maxfield ||
551                             usage->usage_index >= field->report_count)
552                                 return 1;
553                         td->cc_index = field->index;
554                         td->cc_value_index = usage->usage_index;
555                         return 1;
556                 case HID_DG_CONTACTMAX:
557                         /* we don't set td->last_slot_field as contactcount and
558                          * contact max are global to the report */
559                         return -1;
560                 case HID_DG_TOUCH:
561                         /* Legacy devices use TIPSWITCH and not TOUCH.
562                          * Let's just ignore this field. */
563                         return -1;
564                 }
565                 /* let hid-input decide for the others */
566                 return 0;
567 
568         case HID_UP_BUTTON:
569                 code = BTN_MOUSE + ((usage->hid - 1) & HID_USAGE);
570                 hid_map_usage(hi, usage, bit, max, EV_KEY, code);
571                 input_set_capability(hi->input, EV_KEY, code);
572                 return 1;
573 
574         case 0xff000000:
575                 /* we do not want to map these: no input-oriented meaning */
576                 return -1;
577         }
578 
579         return 0;
580 }
581 
582 static int mt_touch_input_mapped(struct hid_device *hdev, struct hid_input *hi,
583                 struct hid_field *field, struct hid_usage *usage,
584                 unsigned long **bit, int *max)
585 {
586         if (usage->type == EV_KEY || usage->type == EV_ABS)
587                 set_bit(usage->type, hi->input->evbit);
588 
589         return -1;
590 }
591 
592 static int mt_compute_slot(struct mt_device *td, struct input_dev *input)
593 {
594         __s32 quirks = td->mtclass.quirks;
595 
596         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
597                 return td->curdata.contactid;
598 
599         if (quirks & MT_QUIRK_CYPRESS)
600                 return cypress_compute_slot(td);
601 
602         if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
603                 return td->num_received;
604 
605         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE)
606                 return td->curdata.contactid - 1;
607 
608         return input_mt_get_slot_by_key(input, td->curdata.contactid);
609 }
610 
611 /*
612  * this function is called when a whole contact has been processed,
613  * so that it can assign it to a slot and store the data there
614  */
615 static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
616 {
617         if ((td->mtclass.quirks & MT_QUIRK_CONTACT_CNT_ACCURATE) &&
618             td->num_received >= td->num_expected)
619                 return;
620 
621         if (td->curvalid || (td->mtclass.quirks & MT_QUIRK_ALWAYS_VALID)) {
622                 int slotnum = mt_compute_slot(td, input);
623                 struct mt_slot *s = &td->curdata;
624                 struct input_mt *mt = input->mt;
625 
626                 if (slotnum < 0 || slotnum >= td->maxcontacts)
627                         return;
628 
629                 if ((td->mtclass.quirks & MT_QUIRK_IGNORE_DUPLICATES) && mt) {
630                         struct input_mt_slot *slot = &mt->slots[slotnum];
631                         if (input_mt_is_active(slot) &&
632                             input_mt_is_used(mt, slot))
633                                 return;
634                 }
635 
636                 input_mt_slot(input, slotnum);
637                 input_mt_report_slot_state(input, MT_TOOL_FINGER,
638                         s->touch_state || s->inrange_state);
639                 if (s->touch_state || s->inrange_state) {
640                         /* this finger is in proximity of the sensor */
641                         int wide = (s->w > s->h);
642                         /* divided by two to match visual scale of touch */
643                         int major = max(s->w, s->h) >> 1;
644                         int minor = min(s->w, s->h) >> 1;
645 
646                         input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
647                         input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
648                         input_event(input, EV_ABS, ABS_MT_TOOL_X, s->cx);
649                         input_event(input, EV_ABS, ABS_MT_TOOL_Y, s->cy);
650                         input_event(input, EV_ABS, ABS_MT_DISTANCE,
651                                 !s->touch_state);
652                         input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
653                         input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
654                         input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
655                         input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
656                 }
657         }
658 
659         td->num_received++;
660 }
661 
662 /*
663  * this function is called when a whole packet has been received and processed,
664  * so that it can decide what to send to the input layer.
665  */
666 static void mt_sync_frame(struct mt_device *td, struct input_dev *input)
667 {
668         input_mt_sync_frame(input);
669         input_sync(input);
670         td->num_received = 0;
671 }
672 
673 static int mt_touch_event(struct hid_device *hid, struct hid_field *field,
674                                 struct hid_usage *usage, __s32 value)
675 {
676         /* we will handle the hidinput part later, now remains hiddev */
677         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
678                 hid->hiddev_hid_event(hid, field, usage, value);
679 
680         return 1;
681 }
682 
683 static void mt_process_mt_event(struct hid_device *hid, struct hid_field *field,
684                                 struct hid_usage *usage, __s32 value)
685 {
686         struct mt_device *td = hid_get_drvdata(hid);
687         __s32 quirks = td->mtclass.quirks;
688         struct input_dev *input = field->hidinput->input;
689 
690         if (hid->claimed & HID_CLAIMED_INPUT) {
691                 switch (usage->hid) {
692                 case HID_DG_INRANGE:
693                         if (quirks & MT_QUIRK_VALID_IS_INRANGE)
694                                 td->curvalid = value;
695                         if (quirks & MT_QUIRK_HOVERING)
696                                 td->curdata.inrange_state = value;
697                         break;
698                 case HID_DG_TIPSWITCH:
699                         if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
700                                 td->curvalid = value;
701                         td->curdata.touch_state = value;
702                         break;
703                 case HID_DG_CONFIDENCE:
704                         if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
705                                 td->curvalid = value;
706                         break;
707                 case HID_DG_CONTACTID:
708                         td->curdata.contactid = value;
709                         break;
710                 case HID_DG_TIPPRESSURE:
711                         td->curdata.p = value;
712                         break;
713                 case HID_GD_X:
714                         if (usage->code == ABS_MT_TOOL_X)
715                                 td->curdata.cx = value;
716                         else
717                                 td->curdata.x = value;
718                         break;
719                 case HID_GD_Y:
720                         if (usage->code == ABS_MT_TOOL_Y)
721                                 td->curdata.cy = value;
722                         else
723                                 td->curdata.y = value;
724                         break;
725                 case HID_DG_WIDTH:
726                         td->curdata.w = value;
727                         break;
728                 case HID_DG_HEIGHT:
729                         td->curdata.h = value;
730                         break;
731                 case HID_DG_CONTACTCOUNT:
732                         break;
733                 case HID_DG_TOUCH:
734                         /* do nothing */
735                         break;
736 
737                 default:
738                         if (usage->type)
739                                 input_event(input, usage->type, usage->code,
740                                                 value);
741                         return;
742                 }
743 
744                 if (usage->usage_index + 1 == field->report_count) {
745                         /* we only take into account the last report. */
746                         if (usage->hid == td->last_slot_field)
747                                 mt_complete_slot(td, field->hidinput->input);
748                 }
749 
750         }
751 }
752 
753 static void mt_touch_report(struct hid_device *hid, struct hid_report *report)
754 {
755         struct mt_device *td = hid_get_drvdata(hid);
756         struct hid_field *field;
757         unsigned count;
758         int r, n;
759 
760         /*
761          * Includes multi-packet support where subsequent
762          * packets are sent with zero contactcount.
763          */
764         if (td->cc_index >= 0) {
765                 struct hid_field *field = report->field[td->cc_index];
766                 int value = field->value[td->cc_value_index];
767                 if (value)
768                         td->num_expected = value;
769         }
770 
771         for (r = 0; r < report->maxfield; r++) {
772                 field = report->field[r];
773                 count = field->report_count;
774 
775                 if (!(HID_MAIN_ITEM_VARIABLE & field->flags))
776                         continue;
777 
778                 for (n = 0; n < count; n++)
779                         mt_process_mt_event(hid, field, &field->usage[n],
780                                         field->value[n]);
781         }
782 
783         if (td->num_received >= td->num_expected)
784                 mt_sync_frame(td, report->field[0]->hidinput->input);
785 }
786 
787 static int mt_touch_input_configured(struct hid_device *hdev,
788                                         struct hid_input *hi)
789 {
790         struct mt_device *td = hid_get_drvdata(hdev);
791         struct mt_class *cls = &td->mtclass;
792         struct input_dev *input = hi->input;
793         int ret;
794 
795         if (!td->maxcontacts)
796                 td->maxcontacts = MT_DEFAULT_MAXCONTACT;
797 
798         mt_post_parse(td);
799         if (td->serial_maybe)
800                 mt_post_parse_default_settings(td);
801 
802         if (cls->is_indirect)
803                 td->mt_flags |= INPUT_MT_POINTER;
804 
805         if (cls->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
806                 td->mt_flags |= INPUT_MT_DROP_UNUSED;
807 
808         /* check for clickpads */
809         if ((td->mt_flags & INPUT_MT_POINTER) && (td->buttons_count == 1))
810                 td->is_buttonpad = true;
811 
812         if (td->is_buttonpad)
813                 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
814 
815         ret = input_mt_init_slots(input, td->maxcontacts, td->mt_flags);
816         if (ret)
817                 return ret;
818 
819         td->mt_flags = 0;
820         return 0;
821 }
822 
823 static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
824                 struct hid_field *field, struct hid_usage *usage,
825                 unsigned long **bit, int *max)
826 {
827         struct mt_device *td = hid_get_drvdata(hdev);
828 
829         /*
830          * If mtclass.export_all_inputs is not set, only map fields from
831          * TouchScreen or TouchPad collections. We need to ignore fields
832          * that belong to other collections such as Mouse that might have
833          * the same GenericDesktop usages.
834          */
835         if (!td->mtclass.export_all_inputs &&
836             field->application != HID_DG_TOUCHSCREEN &&
837             field->application != HID_DG_PEN &&
838             field->application != HID_DG_TOUCHPAD)
839                 return -1;
840 
841         /*
842          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
843          * for the stylus.
844          * The check for mt_report_id ensures we don't process
845          * HID_DG_CONTACTCOUNT from the pen report as it is outside the physical
846          * collection, but within the report ID.
847          */
848         if (field->physical == HID_DG_STYLUS)
849                 return 0;
850         else if ((field->physical == 0) &&
851                  (field->report->id != td->mt_report_id) &&
852                  (td->mt_report_id != -1))
853                 return 0;
854 
855         if (field->application == HID_DG_TOUCHSCREEN ||
856             field->application == HID_DG_TOUCHPAD)
857                 return mt_touch_input_mapping(hdev, hi, field, usage, bit, max);
858 
859         /* let hid-core decide for the others */
860         return 0;
861 }
862 
863 static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
864                 struct hid_field *field, struct hid_usage *usage,
865                 unsigned long **bit, int *max)
866 {
867         /*
868          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
869          * for the stylus.
870          */
871         if (field->physical == HID_DG_STYLUS)
872                 return 0;
873 
874         if (field->application == HID_DG_TOUCHSCREEN ||
875             field->application == HID_DG_TOUCHPAD)
876                 return mt_touch_input_mapped(hdev, hi, field, usage, bit, max);
877 
878         /* let hid-core decide for the others */
879         return 0;
880 }
881 
882 static int mt_event(struct hid_device *hid, struct hid_field *field,
883                                 struct hid_usage *usage, __s32 value)
884 {
885         struct mt_device *td = hid_get_drvdata(hid);
886 
887         if (field->report->id == td->mt_report_id)
888                 return mt_touch_event(hid, field, usage, value);
889 
890         return 0;
891 }
892 
893 static void mt_report(struct hid_device *hid, struct hid_report *report)
894 {
895         struct mt_device *td = hid_get_drvdata(hid);
896         struct hid_field *field = report->field[0];
897 
898         if (!(hid->claimed & HID_CLAIMED_INPUT))
899                 return;
900 
901         if (report->id == td->mt_report_id)
902                 return mt_touch_report(hid, report);
903 
904         if (field && field->hidinput && field->hidinput->input)
905                 input_sync(field->hidinput->input);
906 }
907 
908 static void mt_set_input_mode(struct hid_device *hdev)
909 {
910         struct mt_device *td = hid_get_drvdata(hdev);
911         struct hid_report *r;
912         struct hid_report_enum *re;
913         struct mt_class *cls = &td->mtclass;
914         char *buf;
915         int report_len;
916 
917         if (td->inputmode < 0)
918                 return;
919 
920         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
921         r = re->report_id_hash[td->inputmode];
922         if (r) {
923                 if (cls->quirks & MT_QUIRK_FORCE_GET_FEATURE) {
924                         report_len = hid_report_len(r);
925                         buf = hid_alloc_report_buf(r, GFP_KERNEL);
926                         if (!buf) {
927                                 hid_err(hdev, "failed to allocate buffer for report\n");
928                                 return;
929                         }
930                         hid_hw_raw_request(hdev, r->id, buf, report_len,
931                                            HID_FEATURE_REPORT,
932                                            HID_REQ_GET_REPORT);
933                         kfree(buf);
934                 }
935                 r->field[0]->value[td->inputmode_index] = td->inputmode_value;
936                 hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
937         }
938 }
939 
940 static void mt_set_maxcontacts(struct hid_device *hdev)
941 {
942         struct mt_device *td = hid_get_drvdata(hdev);
943         struct hid_report *r;
944         struct hid_report_enum *re;
945         int fieldmax, max;
946 
947         if (td->maxcontact_report_id < 0)
948                 return;
949 
950         if (!td->mtclass.maxcontacts)
951                 return;
952 
953         re = &hdev->report_enum[HID_FEATURE_REPORT];
954         r = re->report_id_hash[td->maxcontact_report_id];
955         if (r) {
956                 max = td->mtclass.maxcontacts;
957                 fieldmax = r->field[0]->logical_maximum;
958                 max = min(fieldmax, max);
959                 if (r->field[0]->value[0] != max) {
960                         r->field[0]->value[0] = max;
961                         hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
962                 }
963         }
964 }
965 
966 static void mt_post_parse_default_settings(struct mt_device *td)
967 {
968         __s32 quirks = td->mtclass.quirks;
969 
970         /* unknown serial device needs special quirks */
971         if (td->touches_by_report == 1) {
972                 quirks |= MT_QUIRK_ALWAYS_VALID;
973                 quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP;
974                 quirks &= ~MT_QUIRK_VALID_IS_INRANGE;
975                 quirks &= ~MT_QUIRK_VALID_IS_CONFIDENCE;
976                 quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
977         }
978 
979         td->mtclass.quirks = quirks;
980 }
981 
982 static void mt_post_parse(struct mt_device *td)
983 {
984         struct mt_fields *f = td->fields;
985         struct mt_class *cls = &td->mtclass;
986 
987         if (td->touches_by_report > 0) {
988                 int field_count_per_touch = f->length / td->touches_by_report;
989                 td->last_slot_field = f->usages[field_count_per_touch - 1];
990         }
991 
992         if (td->cc_index < 0)
993                 cls->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
994 }
995 
996 static int mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
997 {
998         struct mt_device *td = hid_get_drvdata(hdev);
999         char *name;
1000         const char *suffix = NULL;
1001         struct hid_field *field = hi->report->field[0];
1002         int ret;
1003 
1004         if (hi->report->id == td->mt_report_id) {
1005                 ret = mt_touch_input_configured(hdev, hi);
1006                 if (ret)
1007                         return ret;
1008         }
1009 
1010         /*
1011          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
1012          * for the stylus. Check this first, and then rely on the application
1013          * field.
1014          */
1015         if (hi->report->field[0]->physical == HID_DG_STYLUS) {
1016                 suffix = "Pen";
1017                 /* force BTN_STYLUS to allow tablet matching in udev */
1018                 __set_bit(BTN_STYLUS, hi->input->keybit);
1019         } else {
1020                 switch (field->application) {
1021                 case HID_GD_KEYBOARD:
1022                         suffix = "Keyboard";
1023                         break;
1024                 case HID_GD_KEYPAD:
1025                         suffix = "Keypad";
1026                         break;
1027                 case HID_GD_MOUSE:
1028                         suffix = "Mouse";
1029                         break;
1030                 case HID_DG_STYLUS:
1031                         suffix = "Pen";
1032                         /* force BTN_STYLUS to allow tablet matching in udev */
1033                         __set_bit(BTN_STYLUS, hi->input->keybit);
1034                         break;
1035                 case HID_DG_TOUCHSCREEN:
1036                         /* we do not set suffix = "Touchscreen" */
1037                         break;
1038                 case HID_DG_TOUCHPAD:
1039                         suffix = "Touchpad";
1040                         break;
1041                 case HID_GD_SYSTEM_CONTROL:
1042                         suffix = "System Control";
1043                         break;
1044                 case HID_CP_CONSUMER_CONTROL:
1045                         suffix = "Consumer Control";
1046                         break;
1047                 default:
1048                         suffix = "UNKNOWN";
1049                         break;
1050                 }
1051         }
1052 
1053         if (suffix) {
1054                 name = devm_kzalloc(&hi->input->dev,
1055                                     strlen(hdev->name) + strlen(suffix) + 2,
1056                                     GFP_KERNEL);
1057                 if (name) {
1058                         sprintf(name, "%s %s", hdev->name, suffix);
1059                         hi->input->name = name;
1060                 }
1061         }
1062 
1063         return 0;
1064 }
1065 
1066 static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
1067 {
1068         int ret, i;
1069         struct mt_device *td;
1070         struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
1071 
1072         for (i = 0; mt_classes[i].name ; i++) {
1073                 if (id->driver_data == mt_classes[i].name) {
1074                         mtclass = &(mt_classes[i]);
1075                         break;
1076                 }
1077         }
1078 
1079         /* This allows the driver to correctly support devices
1080          * that emit events over several HID messages.
1081          */
1082         hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
1083 
1084         /*
1085          * This allows the driver to handle different input sensors
1086          * that emits events through different reports on the same HID
1087          * device.
1088          */
1089         hdev->quirks |= HID_QUIRK_MULTI_INPUT;
1090         hdev->quirks |= HID_QUIRK_NO_EMPTY_INPUT;
1091 
1092         /*
1093          * Handle special quirks for Windows 8 certified devices.
1094          */
1095         if (id->group == HID_GROUP_MULTITOUCH_WIN_8)
1096                 /*
1097                  * Some multitouch screens do not like to be polled for input
1098                  * reports. Fortunately, the Win8 spec says that all touches
1099                  * should be sent during each report, making the initialization
1100                  * of input reports unnecessary.
1101                  *
1102                  * In addition some touchpads do not behave well if we read
1103                  * all feature reports from them. Instead we prevent
1104                  * initial report fetching and then selectively fetch each
1105                  * report we are interested in.
1106                  */
1107                 hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
1108 
1109         td = devm_kzalloc(&hdev->dev, sizeof(struct mt_device), GFP_KERNEL);
1110         if (!td) {
1111                 dev_err(&hdev->dev, "cannot allocate multitouch data\n");
1112                 return -ENOMEM;
1113         }
1114         td->mtclass = *mtclass;
1115         td->inputmode = -1;
1116         td->maxcontact_report_id = -1;
1117         td->inputmode_value = MT_INPUTMODE_TOUCHSCREEN;
1118         td->cc_index = -1;
1119         td->mt_report_id = -1;
1120         hid_set_drvdata(hdev, td);
1121 
1122         td->fields = devm_kzalloc(&hdev->dev, sizeof(struct mt_fields),
1123                                   GFP_KERNEL);
1124         if (!td->fields) {
1125                 dev_err(&hdev->dev, "cannot allocate multitouch fields data\n");
1126                 return -ENOMEM;
1127         }
1128 
1129         if (id->vendor == HID_ANY_ID && id->product == HID_ANY_ID)
1130                 td->serial_maybe = true;
1131 
1132         ret = hid_parse(hdev);
1133         if (ret != 0)
1134                 return ret;
1135 
1136         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
1137         if (ret)
1138                 return ret;
1139 
1140         ret = sysfs_create_group(&hdev->dev.kobj, &mt_attribute_group);
1141         if (ret)
1142                 dev_warn(&hdev->dev, "Cannot allocate sysfs group for %s\n",
1143                                 hdev->name);
1144 
1145         mt_set_maxcontacts(hdev);
1146         mt_set_input_mode(hdev);
1147 
1148         /* release .fields memory as it is not used anymore */
1149         devm_kfree(&hdev->dev, td->fields);
1150         td->fields = NULL;
1151 
1152         return 0;
1153 }
1154 
1155 #ifdef CONFIG_PM
1156 static void mt_release_contacts(struct hid_device *hid)
1157 {
1158         struct hid_input *hidinput;
1159 
1160         list_for_each_entry(hidinput, &hid->inputs, list) {
1161                 struct input_dev *input_dev = hidinput->input;
1162                 struct input_mt *mt = input_dev->mt;
1163                 int i;
1164 
1165                 if (mt) {
1166                         for (i = 0; i < mt->num_slots; i++) {
1167                                 input_mt_slot(input_dev, i);
1168                                 input_mt_report_slot_state(input_dev,
1169                                                            MT_TOOL_FINGER,
1170                                                            false);
1171                         }
1172                         input_mt_sync_frame(input_dev);
1173                         input_sync(input_dev);
1174                 }
1175         }
1176 }
1177 
1178 static int mt_reset_resume(struct hid_device *hdev)
1179 {
1180         mt_release_contacts(hdev);
1181         mt_set_maxcontacts(hdev);
1182         mt_set_input_mode(hdev);
1183         return 0;
1184 }
1185 
1186 static int mt_resume(struct hid_device *hdev)
1187 {
1188         /* Some Elan legacy devices require SET_IDLE to be set on resume.
1189          * It should be safe to send it to other devices too.
1190          * Tested on 3M, Stantum, Cypress, Zytronic, eGalax, and Elan panels. */
1191 
1192         hid_hw_idle(hdev, 0, 0, HID_REQ_SET_IDLE);
1193 
1194         return 0;
1195 }
1196 #endif
1197 
1198 static void mt_remove(struct hid_device *hdev)
1199 {
1200         sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);
1201         hid_hw_stop(hdev);
1202 }
1203 
1204 /*
1205  * This list contains only:
1206  * - VID/PID of products not working with the default multitouch handling
1207  * - 2 generic rules.
1208  * So there is no point in adding here any device with MT_CLS_DEFAULT.
1209  */
1210 static const struct hid_device_id mt_devices[] = {
1211 
1212         /* 3M panels */
1213         { .driver_data = MT_CLS_3M,
1214                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1215                         USB_DEVICE_ID_3M1968) },
1216         { .driver_data = MT_CLS_3M,
1217                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1218                         USB_DEVICE_ID_3M2256) },
1219         { .driver_data = MT_CLS_3M,
1220                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1221                         USB_DEVICE_ID_3M3266) },
1222 
1223         /* Anton devices */
1224         { .driver_data = MT_CLS_EXPORT_ALL_INPUTS,
1225                 MT_USB_DEVICE(USB_VENDOR_ID_ANTON,
1226                         USB_DEVICE_ID_ANTON_TOUCH_PAD) },
1227 
1228         /* Atmel panels */
1229         { .driver_data = MT_CLS_SERIAL,
1230                 MT_USB_DEVICE(USB_VENDOR_ID_ATMEL,
1231                         USB_DEVICE_ID_ATMEL_MXT_DIGITIZER) },
1232 
1233         /* Baanto multitouch devices */
1234         { .driver_data = MT_CLS_NSMU,
1235                 MT_USB_DEVICE(USB_VENDOR_ID_BAANTO,
1236                         USB_DEVICE_ID_BAANTO_MT_190W2) },
1237 
1238         /* Cando panels */
1239         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
1240                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1241                         USB_DEVICE_ID_CANDO_MULTI_TOUCH) },
1242         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
1243                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1244                         USB_DEVICE_ID_CANDO_MULTI_TOUCH_15_6) },
1245 
1246         /* Chunghwa Telecom touch panels */
1247         {  .driver_data = MT_CLS_NSMU,
1248                 MT_USB_DEVICE(USB_VENDOR_ID_CHUNGHWAT,
1249                         USB_DEVICE_ID_CHUNGHWAT_MULTITOUCH) },
1250 
1251         /* CJTouch panels */
1252         { .driver_data = MT_CLS_NSMU,
1253                 MT_USB_DEVICE(USB_VENDOR_ID_CJTOUCH,
1254                         USB_DEVICE_ID_CJTOUCH_MULTI_TOUCH_0020) },
1255         { .driver_data = MT_CLS_NSMU,
1256                 MT_USB_DEVICE(USB_VENDOR_ID_CJTOUCH,
1257                         USB_DEVICE_ID_CJTOUCH_MULTI_TOUCH_0040) },
1258 
1259         /* CVTouch panels */
1260         { .driver_data = MT_CLS_NSMU,
1261                 MT_USB_DEVICE(USB_VENDOR_ID_CVTOUCH,
1262                         USB_DEVICE_ID_CVTOUCH_SCREEN) },
1263 
1264         /* eGalax devices (resistive) */
1265         { .driver_data = MT_CLS_EGALAX,
1266                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1267                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480D) },
1268         { .driver_data = MT_CLS_EGALAX,
1269                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1270                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480E) },
1271 
1272         /* eGalax devices (capacitive) */
1273         { .driver_data = MT_CLS_EGALAX_SERIAL,
1274                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1275                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7207) },
1276         { .driver_data = MT_CLS_EGALAX,
1277                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1278                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_720C) },
1279         { .driver_data = MT_CLS_EGALAX_SERIAL,
1280                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1281                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7224) },
1282         { .driver_data = MT_CLS_EGALAX_SERIAL,
1283                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1284                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_722A) },
1285         { .driver_data = MT_CLS_EGALAX_SERIAL,
1286                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1287                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_725E) },
1288         { .driver_data = MT_CLS_EGALAX_SERIAL,
1289                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1290                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7262) },
1291         { .driver_data = MT_CLS_EGALAX,
1292                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1293                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_726B) },
1294         { .driver_data = MT_CLS_EGALAX,
1295                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1296                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72A1) },
1297         { .driver_data = MT_CLS_EGALAX_SERIAL,
1298                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1299                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72AA) },
1300         { .driver_data = MT_CLS_EGALAX,
1301                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
1302                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72C4) },
1303         { .driver_data = MT_CLS_EGALAX,
1304                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
1305                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72D0) },
1306         { .driver_data = MT_CLS_EGALAX,
1307                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1308                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72FA) },
1309         { .driver_data = MT_CLS_EGALAX,
1310                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1311                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7302) },
1312         { .driver_data = MT_CLS_EGALAX_SERIAL,
1313                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1314                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7349) },
1315         { .driver_data = MT_CLS_EGALAX_SERIAL,
1316                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1317                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_73F7) },
1318         { .driver_data = MT_CLS_EGALAX_SERIAL,
1319                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1320                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_A001) },
1321 
1322         /* Elitegroup panel */
1323         { .driver_data = MT_CLS_SERIAL,
1324                 MT_USB_DEVICE(USB_VENDOR_ID_ELITEGROUP,
1325                         USB_DEVICE_ID_ELITEGROUP_05D8) },
1326 
1327         /* Flatfrog Panels */
1328         { .driver_data = MT_CLS_FLATFROG,
1329                 MT_USB_DEVICE(USB_VENDOR_ID_FLATFROG,
1330                         USB_DEVICE_ID_MULTITOUCH_3200) },
1331 
1332         /* FocalTech Panels */
1333         { .driver_data = MT_CLS_SERIAL,
1334                 MT_USB_DEVICE(USB_VENDOR_ID_CYGNAL,
1335                         USB_DEVICE_ID_FOCALTECH_FTXXXX_MULTITOUCH) },
1336 
1337         /* GeneralTouch panel */
1338         { .driver_data = MT_CLS_GENERALTOUCH_TWOFINGERS,
1339                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1340                         USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS) },
1341         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1342                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1343                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PWT_TENFINGERS) },
1344         { .driver_data = MT_CLS_GENERALTOUCH_TWOFINGERS,
1345                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1346                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0101) },
1347         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1348                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1349                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0102) },
1350         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1351                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1352                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0106) },
1353         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1354                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1355                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_010A) },
1356         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1357                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1358                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_E100) },
1359 
1360         /* Gametel game controller */
1361         { .driver_data = MT_CLS_NSMU,
1362                 MT_BT_DEVICE(USB_VENDOR_ID_FRUCTEL,
1363                         USB_DEVICE_ID_GAMETEL_MT_MODE) },
1364 
1365         /* GoodTouch panels */
1366         { .driver_data = MT_CLS_NSMU,
1367                 MT_USB_DEVICE(USB_VENDOR_ID_GOODTOUCH,
1368                         USB_DEVICE_ID_GOODTOUCH_000f) },
1369 
1370         /* Hanvon panels */
1371         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
1372                 MT_USB_DEVICE(USB_VENDOR_ID_HANVON_ALT,
1373                         USB_DEVICE_ID_HANVON_ALT_MULTITOUCH) },
1374 
1375         /* Ilitek dual touch panel */
1376         {  .driver_data = MT_CLS_NSMU,
1377                 MT_USB_DEVICE(USB_VENDOR_ID_ILITEK,
1378                         USB_DEVICE_ID_ILITEK_MULTITOUCH) },
1379 
1380         /* MosArt panels */
1381         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1382                 MT_USB_DEVICE(USB_VENDOR_ID_ASUS,
1383                         USB_DEVICE_ID_ASUS_T91MT)},
1384         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1385                 MT_USB_DEVICE(USB_VENDOR_ID_ASUS,
1386                         USB_DEVICE_ID_ASUSTEK_MULTITOUCH_YFO) },
1387         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1388                 MT_USB_DEVICE(USB_VENDOR_ID_TURBOX,
1389                         USB_DEVICE_ID_TURBOX_TOUCHSCREEN_MOSART) },
1390 
1391         /* Panasonic panels */
1392         { .driver_data = MT_CLS_PANASONIC,
1393                 MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
1394                         USB_DEVICE_ID_PANABOARD_UBT780) },
1395         { .driver_data = MT_CLS_PANASONIC,
1396                 MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
1397                         USB_DEVICE_ID_PANABOARD_UBT880) },
1398 
1399         /* Novatek Panel */
1400         { .driver_data = MT_CLS_NSMU,
1401                 MT_USB_DEVICE(USB_VENDOR_ID_NOVATEK,
1402                         USB_DEVICE_ID_NOVATEK_PCT) },
1403 
1404         /* PixArt optical touch screen */
1405         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1406                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1407                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN) },
1408         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1409                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1410                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN1) },
1411         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1412                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1413                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN2) },
1414 
1415         /* PixCir-based panels */
1416         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
1417                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1418                         USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH) },
1419 
1420         /* Quanta-based panels */
1421         { .driver_data = MT_CLS_CONFIDENCE_CONTACT_ID,
1422                 MT_USB_DEVICE(USB_VENDOR_ID_QUANTA,
1423                         USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3001) },
1424 
1425         /* Stantum panels */
1426         { .driver_data = MT_CLS_CONFIDENCE,
1427                 MT_USB_DEVICE(USB_VENDOR_ID_STANTUM_STM,
1428                         USB_DEVICE_ID_MTP_STM)},
1429 
1430         /* TopSeed panels */
1431         { .driver_data = MT_CLS_TOPSEED,
1432                 MT_USB_DEVICE(USB_VENDOR_ID_TOPSEED2,
1433                         USB_DEVICE_ID_TOPSEED2_PERIPAD_701) },
1434 
1435         /* Touch International panels */
1436         { .driver_data = MT_CLS_NSMU,
1437                 MT_USB_DEVICE(USB_VENDOR_ID_TOUCH_INTL,
1438                         USB_DEVICE_ID_TOUCH_INTL_MULTI_TOUCH) },
1439 
1440         /* Unitec panels */
1441         { .driver_data = MT_CLS_NSMU,
1442                 MT_USB_DEVICE(USB_VENDOR_ID_UNITEC,
1443                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0709) },
1444         { .driver_data = MT_CLS_NSMU,
1445                 MT_USB_DEVICE(USB_VENDOR_ID_UNITEC,
1446                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0A19) },
1447 
1448         /* VTL panels */
1449         { .driver_data = MT_CLS_VTL,
1450                 MT_USB_DEVICE(USB_VENDOR_ID_VTL,
1451                         USB_DEVICE_ID_VTL_MULTITOUCH_FF3F) },
1452 
1453         /* Wistron panels */
1454         { .driver_data = MT_CLS_NSMU,
1455                 MT_USB_DEVICE(USB_VENDOR_ID_WISTRON,
1456                         USB_DEVICE_ID_WISTRON_OPTICAL_TOUCH) },
1457 
1458         /* XAT */
1459         { .driver_data = MT_CLS_NSMU,
1460                 MT_USB_DEVICE(USB_VENDOR_ID_XAT,
1461                         USB_DEVICE_ID_XAT_CSR) },
1462 
1463         /* Xiroku */
1464         { .driver_data = MT_CLS_NSMU,
1465                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1466                         USB_DEVICE_ID_XIROKU_SPX) },
1467         { .driver_data = MT_CLS_NSMU,
1468                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1469                         USB_DEVICE_ID_XIROKU_MPX) },
1470         { .driver_data = MT_CLS_NSMU,
1471                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1472                         USB_DEVICE_ID_XIROKU_CSR) },
1473         { .driver_data = MT_CLS_NSMU,
1474                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1475                         USB_DEVICE_ID_XIROKU_SPX1) },
1476         { .driver_data = MT_CLS_NSMU,
1477                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1478                         USB_DEVICE_ID_XIROKU_MPX1) },
1479         { .driver_data = MT_CLS_NSMU,
1480                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1481                         USB_DEVICE_ID_XIROKU_CSR1) },
1482         { .driver_data = MT_CLS_NSMU,
1483                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1484                         USB_DEVICE_ID_XIROKU_SPX2) },
1485         { .driver_data = MT_CLS_NSMU,
1486                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1487                         USB_DEVICE_ID_XIROKU_MPX2) },
1488         { .driver_data = MT_CLS_NSMU,
1489                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1490                         USB_DEVICE_ID_XIROKU_CSR2) },
1491 
1492         /* Generic MT device */
1493         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH, HID_ANY_ID, HID_ANY_ID) },
1494 
1495         /* Generic Win 8 certified MT device */
1496         {  .driver_data = MT_CLS_WIN_8,
1497                 HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH_WIN_8,
1498                         HID_ANY_ID, HID_ANY_ID) },
1499         { }
1500 };
1501 MODULE_DEVICE_TABLE(hid, mt_devices);
1502 
1503 static const struct hid_usage_id mt_grabbed_usages[] = {
1504         { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
1505         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
1506 };
1507 
1508 static struct hid_driver mt_driver = {
1509         .name = "hid-multitouch",
1510         .id_table = mt_devices,
1511         .probe = mt_probe,
1512         .remove = mt_remove,
1513         .input_mapping = mt_input_mapping,
1514         .input_mapped = mt_input_mapped,
1515         .input_configured = mt_input_configured,
1516         .feature_mapping = mt_feature_mapping,
1517         .usage_table = mt_grabbed_usages,
1518         .event = mt_event,
1519         .report = mt_report,
1520 #ifdef CONFIG_PM
1521         .reset_resume = mt_reset_resume,
1522         .resume = mt_resume,
1523 #endif
1524 };
1525 module_hid_driver(mt_driver);
1526 

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