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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 = container_of(dev, struct 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 = container_of(dev, struct 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                 td->inputmode = field->report->id;
361                 td->inputmode_index = usage->usage_index;
362 
363                 break;
364         case HID_DG_CONTACTMAX:
365                 mt_get_feature(hdev, field->report);
366 
367                 td->maxcontact_report_id = field->report->id;
368                 td->maxcontacts = field->value[0];
369                 if (!td->maxcontacts &&
370                     field->logical_maximum <= MT_MAX_MAXCONTACT)
371                         td->maxcontacts = field->logical_maximum;
372                 if (td->mtclass.maxcontacts)
373                         /* check if the maxcontacts is given by the class */
374                         td->maxcontacts = td->mtclass.maxcontacts;
375 
376                 break;
377         case HID_DG_BUTTONTYPE:
378                 if (usage->usage_index >= field->report_count) {
379                         dev_err(&hdev->dev, "HID_DG_BUTTONTYPE out of range\n");
380                         break;
381                 }
382 
383                 mt_get_feature(hdev, field->report);
384                 if (field->value[usage->usage_index] == MT_BUTTONTYPE_CLICKPAD)
385                         td->is_buttonpad = true;
386 
387                 break;
388         }
389 }
390 
391 static void set_abs(struct input_dev *input, unsigned int code,
392                 struct hid_field *field, int snratio)
393 {
394         int fmin = field->logical_minimum;
395         int fmax = field->logical_maximum;
396         int fuzz = snratio ? (fmax - fmin) / snratio : 0;
397         input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
398         input_abs_set_res(input, code, hidinput_calc_abs_res(field, code));
399 }
400 
401 static void mt_store_field(struct hid_usage *usage, struct mt_device *td,
402                 struct hid_input *hi)
403 {
404         struct mt_fields *f = td->fields;
405 
406         if (f->length >= HID_MAX_FIELDS)
407                 return;
408 
409         f->usages[f->length++] = usage->hid;
410 }
411 
412 static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
413                 struct hid_field *field, struct hid_usage *usage,
414                 unsigned long **bit, int *max)
415 {
416         struct mt_device *td = hid_get_drvdata(hdev);
417         struct mt_class *cls = &td->mtclass;
418         int code;
419         struct hid_usage *prev_usage = NULL;
420 
421         if (field->application == HID_DG_TOUCHSCREEN)
422                 td->mt_flags |= INPUT_MT_DIRECT;
423 
424         /*
425          * Model touchscreens providing buttons as touchpads.
426          */
427         if (field->application == HID_DG_TOUCHPAD ||
428             (usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON) {
429                 td->mt_flags |= INPUT_MT_POINTER;
430                 td->inputmode_value = MT_INPUTMODE_TOUCHPAD;
431         }
432 
433         /* count the buttons on touchpads */
434         if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON)
435                 td->buttons_count++;
436 
437         if (usage->usage_index)
438                 prev_usage = &field->usage[usage->usage_index - 1];
439 
440         switch (usage->hid & HID_USAGE_PAGE) {
441 
442         case HID_UP_GENDESK:
443                 switch (usage->hid) {
444                 case HID_GD_X:
445                         if (prev_usage && (prev_usage->hid == usage->hid)) {
446                                 hid_map_usage(hi, usage, bit, max,
447                                         EV_ABS, ABS_MT_TOOL_X);
448                                 set_abs(hi->input, ABS_MT_TOOL_X, field,
449                                         cls->sn_move);
450                         } else {
451                                 hid_map_usage(hi, usage, bit, max,
452                                         EV_ABS, ABS_MT_POSITION_X);
453                                 set_abs(hi->input, ABS_MT_POSITION_X, field,
454                                         cls->sn_move);
455                         }
456 
457                         mt_store_field(usage, td, hi);
458                         return 1;
459                 case HID_GD_Y:
460                         if (prev_usage && (prev_usage->hid == usage->hid)) {
461                                 hid_map_usage(hi, usage, bit, max,
462                                         EV_ABS, ABS_MT_TOOL_Y);
463                                 set_abs(hi->input, ABS_MT_TOOL_Y, field,
464                                         cls->sn_move);
465                         } else {
466                                 hid_map_usage(hi, usage, bit, max,
467                                         EV_ABS, ABS_MT_POSITION_Y);
468                                 set_abs(hi->input, ABS_MT_POSITION_Y, field,
469                                         cls->sn_move);
470                         }
471 
472                         mt_store_field(usage, td, hi);
473                         return 1;
474                 }
475                 return 0;
476 
477         case HID_UP_DIGITIZER:
478                 switch (usage->hid) {
479                 case HID_DG_INRANGE:
480                         if (cls->quirks & MT_QUIRK_HOVERING) {
481                                 hid_map_usage(hi, usage, bit, max,
482                                         EV_ABS, ABS_MT_DISTANCE);
483                                 input_set_abs_params(hi->input,
484                                         ABS_MT_DISTANCE, 0, 1, 0, 0);
485                         }
486                         mt_store_field(usage, td, hi);
487                         return 1;
488                 case HID_DG_CONFIDENCE:
489                         mt_store_field(usage, td, hi);
490                         return 1;
491                 case HID_DG_TIPSWITCH:
492                         hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
493                         input_set_capability(hi->input, EV_KEY, BTN_TOUCH);
494                         mt_store_field(usage, td, hi);
495                         return 1;
496                 case HID_DG_CONTACTID:
497                         mt_store_field(usage, td, hi);
498                         td->touches_by_report++;
499                         td->mt_report_id = field->report->id;
500                         return 1;
501                 case HID_DG_WIDTH:
502                         hid_map_usage(hi, usage, bit, max,
503                                         EV_ABS, ABS_MT_TOUCH_MAJOR);
504                         if (!(cls->quirks & MT_QUIRK_NO_AREA))
505                                 set_abs(hi->input, ABS_MT_TOUCH_MAJOR, field,
506                                         cls->sn_width);
507                         mt_store_field(usage, td, hi);
508                         return 1;
509                 case HID_DG_HEIGHT:
510                         hid_map_usage(hi, usage, bit, max,
511                                         EV_ABS, ABS_MT_TOUCH_MINOR);
512                         if (!(cls->quirks & MT_QUIRK_NO_AREA)) {
513                                 set_abs(hi->input, ABS_MT_TOUCH_MINOR, field,
514                                         cls->sn_height);
515                                 input_set_abs_params(hi->input,
516                                         ABS_MT_ORIENTATION, 0, 1, 0, 0);
517                         }
518                         mt_store_field(usage, td, hi);
519                         return 1;
520                 case HID_DG_TIPPRESSURE:
521                         hid_map_usage(hi, usage, bit, max,
522                                         EV_ABS, ABS_MT_PRESSURE);
523                         set_abs(hi->input, ABS_MT_PRESSURE, field,
524                                 cls->sn_pressure);
525                         mt_store_field(usage, td, hi);
526                         return 1;
527                 case HID_DG_CONTACTCOUNT:
528                         /* Ignore if indexes are out of bounds. */
529                         if (field->index >= field->report->maxfield ||
530                             usage->usage_index >= field->report_count)
531                                 return 1;
532                         td->cc_index = field->index;
533                         td->cc_value_index = usage->usage_index;
534                         return 1;
535                 case HID_DG_CONTACTMAX:
536                         /* we don't set td->last_slot_field as contactcount and
537                          * contact max are global to the report */
538                         return -1;
539                 case HID_DG_TOUCH:
540                         /* Legacy devices use TIPSWITCH and not TOUCH.
541                          * Let's just ignore this field. */
542                         return -1;
543                 }
544                 /* let hid-input decide for the others */
545                 return 0;
546 
547         case HID_UP_BUTTON:
548                 code = BTN_MOUSE + ((usage->hid - 1) & HID_USAGE);
549                 hid_map_usage(hi, usage, bit, max, EV_KEY, code);
550                 input_set_capability(hi->input, EV_KEY, code);
551                 return 1;
552 
553         case 0xff000000:
554                 /* we do not want to map these: no input-oriented meaning */
555                 return -1;
556         }
557 
558         return 0;
559 }
560 
561 static int mt_touch_input_mapped(struct hid_device *hdev, struct hid_input *hi,
562                 struct hid_field *field, struct hid_usage *usage,
563                 unsigned long **bit, int *max)
564 {
565         if (usage->type == EV_KEY || usage->type == EV_ABS)
566                 set_bit(usage->type, hi->input->evbit);
567 
568         return -1;
569 }
570 
571 static int mt_compute_slot(struct mt_device *td, struct input_dev *input)
572 {
573         __s32 quirks = td->mtclass.quirks;
574 
575         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
576                 return td->curdata.contactid;
577 
578         if (quirks & MT_QUIRK_CYPRESS)
579                 return cypress_compute_slot(td);
580 
581         if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
582                 return td->num_received;
583 
584         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE)
585                 return td->curdata.contactid - 1;
586 
587         return input_mt_get_slot_by_key(input, td->curdata.contactid);
588 }
589 
590 /*
591  * this function is called when a whole contact has been processed,
592  * so that it can assign it to a slot and store the data there
593  */
594 static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
595 {
596         if ((td->mtclass.quirks & MT_QUIRK_CONTACT_CNT_ACCURATE) &&
597             td->num_received >= td->num_expected)
598                 return;
599 
600         if (td->curvalid || (td->mtclass.quirks & MT_QUIRK_ALWAYS_VALID)) {
601                 int slotnum = mt_compute_slot(td, input);
602                 struct mt_slot *s = &td->curdata;
603                 struct input_mt *mt = input->mt;
604 
605                 if (slotnum < 0 || slotnum >= td->maxcontacts)
606                         return;
607 
608                 if ((td->mtclass.quirks & MT_QUIRK_IGNORE_DUPLICATES) && mt) {
609                         struct input_mt_slot *slot = &mt->slots[slotnum];
610                         if (input_mt_is_active(slot) &&
611                             input_mt_is_used(mt, slot))
612                                 return;
613                 }
614 
615                 input_mt_slot(input, slotnum);
616                 input_mt_report_slot_state(input, MT_TOOL_FINGER,
617                         s->touch_state || s->inrange_state);
618                 if (s->touch_state || s->inrange_state) {
619                         /* this finger is in proximity of the sensor */
620                         int wide = (s->w > s->h);
621                         /* divided by two to match visual scale of touch */
622                         int major = max(s->w, s->h) >> 1;
623                         int minor = min(s->w, s->h) >> 1;
624 
625                         input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
626                         input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
627                         input_event(input, EV_ABS, ABS_MT_TOOL_X, s->cx);
628                         input_event(input, EV_ABS, ABS_MT_TOOL_Y, s->cy);
629                         input_event(input, EV_ABS, ABS_MT_DISTANCE,
630                                 !s->touch_state);
631                         input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
632                         input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
633                         input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
634                         input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
635                 }
636         }
637 
638         td->num_received++;
639 }
640 
641 /*
642  * this function is called when a whole packet has been received and processed,
643  * so that it can decide what to send to the input layer.
644  */
645 static void mt_sync_frame(struct mt_device *td, struct input_dev *input)
646 {
647         input_mt_sync_frame(input);
648         input_sync(input);
649         td->num_received = 0;
650 }
651 
652 static int mt_touch_event(struct hid_device *hid, struct hid_field *field,
653                                 struct hid_usage *usage, __s32 value)
654 {
655         /* we will handle the hidinput part later, now remains hiddev */
656         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
657                 hid->hiddev_hid_event(hid, field, usage, value);
658 
659         return 1;
660 }
661 
662 static void mt_process_mt_event(struct hid_device *hid, struct hid_field *field,
663                                 struct hid_usage *usage, __s32 value)
664 {
665         struct mt_device *td = hid_get_drvdata(hid);
666         __s32 quirks = td->mtclass.quirks;
667         struct input_dev *input = field->hidinput->input;
668 
669         if (hid->claimed & HID_CLAIMED_INPUT) {
670                 switch (usage->hid) {
671                 case HID_DG_INRANGE:
672                         if (quirks & MT_QUIRK_VALID_IS_INRANGE)
673                                 td->curvalid = value;
674                         if (quirks & MT_QUIRK_HOVERING)
675                                 td->curdata.inrange_state = value;
676                         break;
677                 case HID_DG_TIPSWITCH:
678                         if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
679                                 td->curvalid = value;
680                         td->curdata.touch_state = value;
681                         break;
682                 case HID_DG_CONFIDENCE:
683                         if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
684                                 td->curvalid = value;
685                         break;
686                 case HID_DG_CONTACTID:
687                         td->curdata.contactid = value;
688                         break;
689                 case HID_DG_TIPPRESSURE:
690                         td->curdata.p = value;
691                         break;
692                 case HID_GD_X:
693                         if (usage->code == ABS_MT_TOOL_X)
694                                 td->curdata.cx = value;
695                         else
696                                 td->curdata.x = value;
697                         break;
698                 case HID_GD_Y:
699                         if (usage->code == ABS_MT_TOOL_Y)
700                                 td->curdata.cy = value;
701                         else
702                                 td->curdata.y = value;
703                         break;
704                 case HID_DG_WIDTH:
705                         td->curdata.w = value;
706                         break;
707                 case HID_DG_HEIGHT:
708                         td->curdata.h = value;
709                         break;
710                 case HID_DG_CONTACTCOUNT:
711                         break;
712                 case HID_DG_TOUCH:
713                         /* do nothing */
714                         break;
715 
716                 default:
717                         if (usage->type)
718                                 input_event(input, usage->type, usage->code,
719                                                 value);
720                         return;
721                 }
722 
723                 if (usage->usage_index + 1 == field->report_count) {
724                         /* we only take into account the last report. */
725                         if (usage->hid == td->last_slot_field)
726                                 mt_complete_slot(td, field->hidinput->input);
727                 }
728 
729         }
730 }
731 
732 static void mt_touch_report(struct hid_device *hid, struct hid_report *report)
733 {
734         struct mt_device *td = hid_get_drvdata(hid);
735         struct hid_field *field;
736         unsigned count;
737         int r, n;
738 
739         /*
740          * Includes multi-packet support where subsequent
741          * packets are sent with zero contactcount.
742          */
743         if (td->cc_index >= 0) {
744                 struct hid_field *field = report->field[td->cc_index];
745                 int value = field->value[td->cc_value_index];
746                 if (value)
747                         td->num_expected = value;
748         }
749 
750         for (r = 0; r < report->maxfield; r++) {
751                 field = report->field[r];
752                 count = field->report_count;
753 
754                 if (!(HID_MAIN_ITEM_VARIABLE & field->flags))
755                         continue;
756 
757                 for (n = 0; n < count; n++)
758                         mt_process_mt_event(hid, field, &field->usage[n],
759                                         field->value[n]);
760         }
761 
762         if (td->num_received >= td->num_expected)
763                 mt_sync_frame(td, report->field[0]->hidinput->input);
764 }
765 
766 static int mt_touch_input_configured(struct hid_device *hdev,
767                                         struct hid_input *hi)
768 {
769         struct mt_device *td = hid_get_drvdata(hdev);
770         struct mt_class *cls = &td->mtclass;
771         struct input_dev *input = hi->input;
772         int ret;
773 
774         if (!td->maxcontacts)
775                 td->maxcontacts = MT_DEFAULT_MAXCONTACT;
776 
777         mt_post_parse(td);
778         if (td->serial_maybe)
779                 mt_post_parse_default_settings(td);
780 
781         if (cls->is_indirect)
782                 td->mt_flags |= INPUT_MT_POINTER;
783 
784         if (cls->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
785                 td->mt_flags |= INPUT_MT_DROP_UNUSED;
786 
787         /* check for clickpads */
788         if ((td->mt_flags & INPUT_MT_POINTER) && (td->buttons_count == 1))
789                 td->is_buttonpad = true;
790 
791         if (td->is_buttonpad)
792                 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
793 
794         ret = input_mt_init_slots(input, td->maxcontacts, td->mt_flags);
795         if (ret)
796                 return ret;
797 
798         td->mt_flags = 0;
799         return 0;
800 }
801 
802 static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
803                 struct hid_field *field, struct hid_usage *usage,
804                 unsigned long **bit, int *max)
805 {
806         struct mt_device *td = hid_get_drvdata(hdev);
807 
808         /*
809          * If mtclass.export_all_inputs is not set, only map fields from
810          * TouchScreen or TouchPad collections. We need to ignore fields
811          * that belong to other collections such as Mouse that might have
812          * the same GenericDesktop usages.
813          */
814         if (!td->mtclass.export_all_inputs &&
815             field->application != HID_DG_TOUCHSCREEN &&
816             field->application != HID_DG_PEN &&
817             field->application != HID_DG_TOUCHPAD)
818                 return -1;
819 
820         /*
821          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
822          * for the stylus.
823          * The check for mt_report_id ensures we don't process
824          * HID_DG_CONTACTCOUNT from the pen report as it is outside the physical
825          * collection, but within the report ID.
826          */
827         if (field->physical == HID_DG_STYLUS)
828                 return 0;
829         else if ((field->physical == 0) &&
830                  (field->report->id != td->mt_report_id) &&
831                  (td->mt_report_id != -1))
832                 return 0;
833 
834         if (field->application == HID_DG_TOUCHSCREEN ||
835             field->application == HID_DG_TOUCHPAD)
836                 return mt_touch_input_mapping(hdev, hi, field, usage, bit, max);
837 
838         /* let hid-core decide for the others */
839         return 0;
840 }
841 
842 static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
843                 struct hid_field *field, struct hid_usage *usage,
844                 unsigned long **bit, int *max)
845 {
846         /*
847          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
848          * for the stylus.
849          */
850         if (field->physical == HID_DG_STYLUS)
851                 return 0;
852 
853         if (field->application == HID_DG_TOUCHSCREEN ||
854             field->application == HID_DG_TOUCHPAD)
855                 return mt_touch_input_mapped(hdev, hi, field, usage, bit, max);
856 
857         /* let hid-core decide for the others */
858         return 0;
859 }
860 
861 static int mt_event(struct hid_device *hid, struct hid_field *field,
862                                 struct hid_usage *usage, __s32 value)
863 {
864         struct mt_device *td = hid_get_drvdata(hid);
865 
866         if (field->report->id == td->mt_report_id)
867                 return mt_touch_event(hid, field, usage, value);
868 
869         return 0;
870 }
871 
872 static void mt_report(struct hid_device *hid, struct hid_report *report)
873 {
874         struct mt_device *td = hid_get_drvdata(hid);
875         struct hid_field *field = report->field[0];
876 
877         if (!(hid->claimed & HID_CLAIMED_INPUT))
878                 return;
879 
880         if (report->id == td->mt_report_id)
881                 return mt_touch_report(hid, report);
882 
883         if (field && field->hidinput && field->hidinput->input)
884                 input_sync(field->hidinput->input);
885 }
886 
887 static void mt_set_input_mode(struct hid_device *hdev)
888 {
889         struct mt_device *td = hid_get_drvdata(hdev);
890         struct hid_report *r;
891         struct hid_report_enum *re;
892         struct mt_class *cls = &td->mtclass;
893         char *buf;
894         int report_len;
895 
896         if (td->inputmode < 0)
897                 return;
898 
899         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
900         r = re->report_id_hash[td->inputmode];
901         if (r) {
902                 if (cls->quirks & MT_QUIRK_FORCE_GET_FEATURE) {
903                         report_len = hid_report_len(r);
904                         buf = hid_alloc_report_buf(r, GFP_KERNEL);
905                         if (!buf) {
906                                 hid_err(hdev, "failed to allocate buffer for report\n");
907                                 return;
908                         }
909                         hid_hw_raw_request(hdev, r->id, buf, report_len,
910                                            HID_FEATURE_REPORT,
911                                            HID_REQ_GET_REPORT);
912                         kfree(buf);
913                 }
914                 r->field[0]->value[td->inputmode_index] = td->inputmode_value;
915                 hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
916         }
917 }
918 
919 static void mt_set_maxcontacts(struct hid_device *hdev)
920 {
921         struct mt_device *td = hid_get_drvdata(hdev);
922         struct hid_report *r;
923         struct hid_report_enum *re;
924         int fieldmax, max;
925 
926         if (td->maxcontact_report_id < 0)
927                 return;
928 
929         if (!td->mtclass.maxcontacts)
930                 return;
931 
932         re = &hdev->report_enum[HID_FEATURE_REPORT];
933         r = re->report_id_hash[td->maxcontact_report_id];
934         if (r) {
935                 max = td->mtclass.maxcontacts;
936                 fieldmax = r->field[0]->logical_maximum;
937                 max = min(fieldmax, max);
938                 if (r->field[0]->value[0] != max) {
939                         r->field[0]->value[0] = max;
940                         hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
941                 }
942         }
943 }
944 
945 static void mt_post_parse_default_settings(struct mt_device *td)
946 {
947         __s32 quirks = td->mtclass.quirks;
948 
949         /* unknown serial device needs special quirks */
950         if (td->touches_by_report == 1) {
951                 quirks |= MT_QUIRK_ALWAYS_VALID;
952                 quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP;
953                 quirks &= ~MT_QUIRK_VALID_IS_INRANGE;
954                 quirks &= ~MT_QUIRK_VALID_IS_CONFIDENCE;
955                 quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
956         }
957 
958         td->mtclass.quirks = quirks;
959 }
960 
961 static void mt_post_parse(struct mt_device *td)
962 {
963         struct mt_fields *f = td->fields;
964         struct mt_class *cls = &td->mtclass;
965 
966         if (td->touches_by_report > 0) {
967                 int field_count_per_touch = f->length / td->touches_by_report;
968                 td->last_slot_field = f->usages[field_count_per_touch - 1];
969         }
970 
971         if (td->cc_index < 0)
972                 cls->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
973 }
974 
975 static int mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
976 {
977         struct mt_device *td = hid_get_drvdata(hdev);
978         char *name;
979         const char *suffix = NULL;
980         struct hid_field *field = hi->report->field[0];
981         int ret;
982 
983         if (hi->report->id == td->mt_report_id) {
984                 ret = mt_touch_input_configured(hdev, hi);
985                 if (ret)
986                         return ret;
987         }
988 
989         /*
990          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
991          * for the stylus. Check this first, and then rely on the application
992          * field.
993          */
994         if (hi->report->field[0]->physical == HID_DG_STYLUS) {
995                 suffix = "Pen";
996                 /* force BTN_STYLUS to allow tablet matching in udev */
997                 __set_bit(BTN_STYLUS, hi->input->keybit);
998         } else {
999                 switch (field->application) {
1000                 case HID_GD_KEYBOARD:
1001                         suffix = "Keyboard";
1002                         break;
1003                 case HID_GD_KEYPAD:
1004                         suffix = "Keypad";
1005                         break;
1006                 case HID_GD_MOUSE:
1007                         suffix = "Mouse";
1008                         break;
1009                 case HID_DG_STYLUS:
1010                         suffix = "Pen";
1011                         /* force BTN_STYLUS to allow tablet matching in udev */
1012                         __set_bit(BTN_STYLUS, hi->input->keybit);
1013                         break;
1014                 case HID_DG_TOUCHSCREEN:
1015                         /* we do not set suffix = "Touchscreen" */
1016                         break;
1017                 case HID_DG_TOUCHPAD:
1018                         suffix = "Touchpad";
1019                         break;
1020                 case HID_GD_SYSTEM_CONTROL:
1021                         suffix = "System Control";
1022                         break;
1023                 case HID_CP_CONSUMER_CONTROL:
1024                         suffix = "Consumer Control";
1025                         break;
1026                 default:
1027                         suffix = "UNKNOWN";
1028                         break;
1029                 }
1030         }
1031 
1032         if (suffix) {
1033                 name = devm_kzalloc(&hi->input->dev,
1034                                     strlen(hdev->name) + strlen(suffix) + 2,
1035                                     GFP_KERNEL);
1036                 if (name) {
1037                         sprintf(name, "%s %s", hdev->name, suffix);
1038                         hi->input->name = name;
1039                 }
1040         }
1041 
1042         return 0;
1043 }
1044 
1045 static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
1046 {
1047         int ret, i;
1048         struct mt_device *td;
1049         struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
1050 
1051         for (i = 0; mt_classes[i].name ; i++) {
1052                 if (id->driver_data == mt_classes[i].name) {
1053                         mtclass = &(mt_classes[i]);
1054                         break;
1055                 }
1056         }
1057 
1058         /* This allows the driver to correctly support devices
1059          * that emit events over several HID messages.
1060          */
1061         hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
1062 
1063         /*
1064          * This allows the driver to handle different input sensors
1065          * that emits events through different reports on the same HID
1066          * device.
1067          */
1068         hdev->quirks |= HID_QUIRK_MULTI_INPUT;
1069         hdev->quirks |= HID_QUIRK_NO_EMPTY_INPUT;
1070 
1071         /*
1072          * Handle special quirks for Windows 8 certified devices.
1073          */
1074         if (id->group == HID_GROUP_MULTITOUCH_WIN_8)
1075                 /*
1076                  * Some multitouch screens do not like to be polled for input
1077                  * reports. Fortunately, the Win8 spec says that all touches
1078                  * should be sent during each report, making the initialization
1079                  * of input reports unnecessary.
1080                  *
1081                  * In addition some touchpads do not behave well if we read
1082                  * all feature reports from them. Instead we prevent
1083                  * initial report fetching and then selectively fetch each
1084                  * report we are interested in.
1085                  */
1086                 hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
1087 
1088         td = devm_kzalloc(&hdev->dev, sizeof(struct mt_device), GFP_KERNEL);
1089         if (!td) {
1090                 dev_err(&hdev->dev, "cannot allocate multitouch data\n");
1091                 return -ENOMEM;
1092         }
1093         td->mtclass = *mtclass;
1094         td->inputmode = -1;
1095         td->maxcontact_report_id = -1;
1096         td->inputmode_value = MT_INPUTMODE_TOUCHSCREEN;
1097         td->cc_index = -1;
1098         td->mt_report_id = -1;
1099         hid_set_drvdata(hdev, td);
1100 
1101         td->fields = devm_kzalloc(&hdev->dev, sizeof(struct mt_fields),
1102                                   GFP_KERNEL);
1103         if (!td->fields) {
1104                 dev_err(&hdev->dev, "cannot allocate multitouch fields data\n");
1105                 return -ENOMEM;
1106         }
1107 
1108         if (id->vendor == HID_ANY_ID && id->product == HID_ANY_ID)
1109                 td->serial_maybe = true;
1110 
1111         ret = hid_parse(hdev);
1112         if (ret != 0)
1113                 return ret;
1114 
1115         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
1116         if (ret)
1117                 return ret;
1118 
1119         ret = sysfs_create_group(&hdev->dev.kobj, &mt_attribute_group);
1120 
1121         mt_set_maxcontacts(hdev);
1122         mt_set_input_mode(hdev);
1123 
1124         /* release .fields memory as it is not used anymore */
1125         devm_kfree(&hdev->dev, td->fields);
1126         td->fields = NULL;
1127 
1128         return 0;
1129 }
1130 
1131 #ifdef CONFIG_PM
1132 static int mt_reset_resume(struct hid_device *hdev)
1133 {
1134         mt_set_maxcontacts(hdev);
1135         mt_set_input_mode(hdev);
1136         return 0;
1137 }
1138 
1139 static int mt_resume(struct hid_device *hdev)
1140 {
1141         /* Some Elan legacy devices require SET_IDLE to be set on resume.
1142          * It should be safe to send it to other devices too.
1143          * Tested on 3M, Stantum, Cypress, Zytronic, eGalax, and Elan panels. */
1144 
1145         hid_hw_idle(hdev, 0, 0, HID_REQ_SET_IDLE);
1146 
1147         return 0;
1148 }
1149 #endif
1150 
1151 static void mt_remove(struct hid_device *hdev)
1152 {
1153         sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);
1154         hid_hw_stop(hdev);
1155 }
1156 
1157 /*
1158  * This list contains only:
1159  * - VID/PID of products not working with the default multitouch handling
1160  * - 2 generic rules.
1161  * So there is no point in adding here any device with MT_CLS_DEFAULT.
1162  */
1163 static const struct hid_device_id mt_devices[] = {
1164 
1165         /* 3M panels */
1166         { .driver_data = MT_CLS_3M,
1167                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1168                         USB_DEVICE_ID_3M1968) },
1169         { .driver_data = MT_CLS_3M,
1170                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1171                         USB_DEVICE_ID_3M2256) },
1172         { .driver_data = MT_CLS_3M,
1173                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1174                         USB_DEVICE_ID_3M3266) },
1175 
1176         /* Anton devices */
1177         { .driver_data = MT_CLS_EXPORT_ALL_INPUTS,
1178                 MT_USB_DEVICE(USB_VENDOR_ID_ANTON,
1179                         USB_DEVICE_ID_ANTON_TOUCH_PAD) },
1180 
1181         /* Atmel panels */
1182         { .driver_data = MT_CLS_SERIAL,
1183                 MT_USB_DEVICE(USB_VENDOR_ID_ATMEL,
1184                         USB_DEVICE_ID_ATMEL_MXT_DIGITIZER) },
1185 
1186         /* Baanto multitouch devices */
1187         { .driver_data = MT_CLS_NSMU,
1188                 MT_USB_DEVICE(USB_VENDOR_ID_BAANTO,
1189                         USB_DEVICE_ID_BAANTO_MT_190W2) },
1190 
1191         /* Cando panels */
1192         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
1193                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1194                         USB_DEVICE_ID_CANDO_MULTI_TOUCH) },
1195         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
1196                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1197                         USB_DEVICE_ID_CANDO_MULTI_TOUCH_15_6) },
1198 
1199         /* Chunghwa Telecom touch panels */
1200         {  .driver_data = MT_CLS_NSMU,
1201                 MT_USB_DEVICE(USB_VENDOR_ID_CHUNGHWAT,
1202                         USB_DEVICE_ID_CHUNGHWAT_MULTITOUCH) },
1203 
1204         /* CJTouch panels */
1205         { .driver_data = MT_CLS_NSMU,
1206                 MT_USB_DEVICE(USB_VENDOR_ID_CJTOUCH,
1207                         USB_DEVICE_ID_CJTOUCH_MULTI_TOUCH_0020) },
1208         { .driver_data = MT_CLS_NSMU,
1209                 MT_USB_DEVICE(USB_VENDOR_ID_CJTOUCH,
1210                         USB_DEVICE_ID_CJTOUCH_MULTI_TOUCH_0040) },
1211 
1212         /* CVTouch panels */
1213         { .driver_data = MT_CLS_NSMU,
1214                 MT_USB_DEVICE(USB_VENDOR_ID_CVTOUCH,
1215                         USB_DEVICE_ID_CVTOUCH_SCREEN) },
1216 
1217         /* eGalax devices (resistive) */
1218         { .driver_data = MT_CLS_EGALAX,
1219                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1220                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480D) },
1221         { .driver_data = MT_CLS_EGALAX,
1222                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1223                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480E) },
1224 
1225         /* eGalax devices (capacitive) */
1226         { .driver_data = MT_CLS_EGALAX_SERIAL,
1227                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1228                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7207) },
1229         { .driver_data = MT_CLS_EGALAX,
1230                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1231                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_720C) },
1232         { .driver_data = MT_CLS_EGALAX_SERIAL,
1233                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1234                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7224) },
1235         { .driver_data = MT_CLS_EGALAX_SERIAL,
1236                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1237                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_722A) },
1238         { .driver_data = MT_CLS_EGALAX_SERIAL,
1239                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1240                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_725E) },
1241         { .driver_data = MT_CLS_EGALAX_SERIAL,
1242                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1243                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7262) },
1244         { .driver_data = MT_CLS_EGALAX,
1245                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1246                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_726B) },
1247         { .driver_data = MT_CLS_EGALAX,
1248                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1249                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72A1) },
1250         { .driver_data = MT_CLS_EGALAX_SERIAL,
1251                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1252                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72AA) },
1253         { .driver_data = MT_CLS_EGALAX,
1254                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
1255                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72C4) },
1256         { .driver_data = MT_CLS_EGALAX,
1257                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
1258                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72D0) },
1259         { .driver_data = MT_CLS_EGALAX,
1260                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1261                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72FA) },
1262         { .driver_data = MT_CLS_EGALAX,
1263                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1264                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7302) },
1265         { .driver_data = MT_CLS_EGALAX_SERIAL,
1266                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1267                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7349) },
1268         { .driver_data = MT_CLS_EGALAX_SERIAL,
1269                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1270                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_73F7) },
1271         { .driver_data = MT_CLS_EGALAX_SERIAL,
1272                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1273                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_A001) },
1274 
1275         /* Elitegroup panel */
1276         { .driver_data = MT_CLS_SERIAL,
1277                 MT_USB_DEVICE(USB_VENDOR_ID_ELITEGROUP,
1278                         USB_DEVICE_ID_ELITEGROUP_05D8) },
1279 
1280         /* Flatfrog Panels */
1281         { .driver_data = MT_CLS_FLATFROG,
1282                 MT_USB_DEVICE(USB_VENDOR_ID_FLATFROG,
1283                         USB_DEVICE_ID_MULTITOUCH_3200) },
1284 
1285         /* FocalTech Panels */
1286         { .driver_data = MT_CLS_SERIAL,
1287                 MT_USB_DEVICE(USB_VENDOR_ID_CYGNAL,
1288                         USB_DEVICE_ID_FOCALTECH_FTXXXX_MULTITOUCH) },
1289 
1290         /* GeneralTouch panel */
1291         { .driver_data = MT_CLS_GENERALTOUCH_TWOFINGERS,
1292                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1293                         USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS) },
1294         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1295                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1296                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PWT_TENFINGERS) },
1297         { .driver_data = MT_CLS_GENERALTOUCH_TWOFINGERS,
1298                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1299                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0101) },
1300         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1301                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1302                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0102) },
1303         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1304                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1305                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0106) },
1306         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1307                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1308                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_010A) },
1309         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1310                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1311                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_E100) },
1312 
1313         /* Gametel game controller */
1314         { .driver_data = MT_CLS_NSMU,
1315                 MT_BT_DEVICE(USB_VENDOR_ID_FRUCTEL,
1316                         USB_DEVICE_ID_GAMETEL_MT_MODE) },
1317 
1318         /* GoodTouch panels */
1319         { .driver_data = MT_CLS_NSMU,
1320                 MT_USB_DEVICE(USB_VENDOR_ID_GOODTOUCH,
1321                         USB_DEVICE_ID_GOODTOUCH_000f) },
1322 
1323         /* Hanvon panels */
1324         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
1325                 MT_USB_DEVICE(USB_VENDOR_ID_HANVON_ALT,
1326                         USB_DEVICE_ID_HANVON_ALT_MULTITOUCH) },
1327 
1328         /* Ilitek dual touch panel */
1329         {  .driver_data = MT_CLS_NSMU,
1330                 MT_USB_DEVICE(USB_VENDOR_ID_ILITEK,
1331                         USB_DEVICE_ID_ILITEK_MULTITOUCH) },
1332 
1333         /* MosArt panels */
1334         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1335                 MT_USB_DEVICE(USB_VENDOR_ID_ASUS,
1336                         USB_DEVICE_ID_ASUS_T91MT)},
1337         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1338                 MT_USB_DEVICE(USB_VENDOR_ID_ASUS,
1339                         USB_DEVICE_ID_ASUSTEK_MULTITOUCH_YFO) },
1340         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1341                 MT_USB_DEVICE(USB_VENDOR_ID_TURBOX,
1342                         USB_DEVICE_ID_TURBOX_TOUCHSCREEN_MOSART) },
1343 
1344         /* Panasonic panels */
1345         { .driver_data = MT_CLS_PANASONIC,
1346                 MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
1347                         USB_DEVICE_ID_PANABOARD_UBT780) },
1348         { .driver_data = MT_CLS_PANASONIC,
1349                 MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
1350                         USB_DEVICE_ID_PANABOARD_UBT880) },
1351 
1352         /* Novatek Panel */
1353         { .driver_data = MT_CLS_NSMU,
1354                 MT_USB_DEVICE(USB_VENDOR_ID_NOVATEK,
1355                         USB_DEVICE_ID_NOVATEK_PCT) },
1356 
1357         /* PixArt optical touch screen */
1358         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1359                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1360                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN) },
1361         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1362                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1363                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN1) },
1364         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1365                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1366                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN2) },
1367 
1368         /* PixCir-based panels */
1369         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
1370                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1371                         USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH) },
1372 
1373         /* Quanta-based panels */
1374         { .driver_data = MT_CLS_CONFIDENCE_CONTACT_ID,
1375                 MT_USB_DEVICE(USB_VENDOR_ID_QUANTA,
1376                         USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3001) },
1377 
1378         /* Stantum panels */
1379         { .driver_data = MT_CLS_CONFIDENCE,
1380                 MT_USB_DEVICE(USB_VENDOR_ID_STANTUM_STM,
1381                         USB_DEVICE_ID_MTP_STM)},
1382 
1383         /* TopSeed panels */
1384         { .driver_data = MT_CLS_TOPSEED,
1385                 MT_USB_DEVICE(USB_VENDOR_ID_TOPSEED2,
1386                         USB_DEVICE_ID_TOPSEED2_PERIPAD_701) },
1387 
1388         /* Touch International panels */
1389         { .driver_data = MT_CLS_NSMU,
1390                 MT_USB_DEVICE(USB_VENDOR_ID_TOUCH_INTL,
1391                         USB_DEVICE_ID_TOUCH_INTL_MULTI_TOUCH) },
1392 
1393         /* Unitec panels */
1394         { .driver_data = MT_CLS_NSMU,
1395                 MT_USB_DEVICE(USB_VENDOR_ID_UNITEC,
1396                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0709) },
1397         { .driver_data = MT_CLS_NSMU,
1398                 MT_USB_DEVICE(USB_VENDOR_ID_UNITEC,
1399                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0A19) },
1400 
1401         /* VTL panels */
1402         { .driver_data = MT_CLS_VTL,
1403                 MT_USB_DEVICE(USB_VENDOR_ID_VTL,
1404                         USB_DEVICE_ID_VTL_MULTITOUCH_FF3F) },
1405 
1406         /* Wistron panels */
1407         { .driver_data = MT_CLS_NSMU,
1408                 MT_USB_DEVICE(USB_VENDOR_ID_WISTRON,
1409                         USB_DEVICE_ID_WISTRON_OPTICAL_TOUCH) },
1410 
1411         /* XAT */
1412         { .driver_data = MT_CLS_NSMU,
1413                 MT_USB_DEVICE(USB_VENDOR_ID_XAT,
1414                         USB_DEVICE_ID_XAT_CSR) },
1415 
1416         /* Xiroku */
1417         { .driver_data = MT_CLS_NSMU,
1418                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1419                         USB_DEVICE_ID_XIROKU_SPX) },
1420         { .driver_data = MT_CLS_NSMU,
1421                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1422                         USB_DEVICE_ID_XIROKU_MPX) },
1423         { .driver_data = MT_CLS_NSMU,
1424                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1425                         USB_DEVICE_ID_XIROKU_CSR) },
1426         { .driver_data = MT_CLS_NSMU,
1427                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1428                         USB_DEVICE_ID_XIROKU_SPX1) },
1429         { .driver_data = MT_CLS_NSMU,
1430                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1431                         USB_DEVICE_ID_XIROKU_MPX1) },
1432         { .driver_data = MT_CLS_NSMU,
1433                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1434                         USB_DEVICE_ID_XIROKU_CSR1) },
1435         { .driver_data = MT_CLS_NSMU,
1436                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1437                         USB_DEVICE_ID_XIROKU_SPX2) },
1438         { .driver_data = MT_CLS_NSMU,
1439                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1440                         USB_DEVICE_ID_XIROKU_MPX2) },
1441         { .driver_data = MT_CLS_NSMU,
1442                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1443                         USB_DEVICE_ID_XIROKU_CSR2) },
1444 
1445         /* Generic MT device */
1446         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH, HID_ANY_ID, HID_ANY_ID) },
1447 
1448         /* Generic Win 8 certified MT device */
1449         {  .driver_data = MT_CLS_WIN_8,
1450                 HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH_WIN_8,
1451                         HID_ANY_ID, HID_ANY_ID) },
1452         { }
1453 };
1454 MODULE_DEVICE_TABLE(hid, mt_devices);
1455 
1456 static const struct hid_usage_id mt_grabbed_usages[] = {
1457         { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
1458         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
1459 };
1460 
1461 static struct hid_driver mt_driver = {
1462         .name = "hid-multitouch",
1463         .id_table = mt_devices,
1464         .probe = mt_probe,
1465         .remove = mt_remove,
1466         .input_mapping = mt_input_mapping,
1467         .input_mapped = mt_input_mapped,
1468         .input_configured = mt_input_configured,
1469         .feature_mapping = mt_feature_mapping,
1470         .usage_table = mt_grabbed_usages,
1471         .event = mt_event,
1472         .report = mt_report,
1473 #ifdef CONFIG_PM
1474         .reset_resume = mt_reset_resume,
1475         .resume = mt_resume,
1476 #endif
1477 };
1478 module_hid_driver(mt_driver);
1479 

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