HID: multitouch: add support for Nexio 42" panel

This device is the worst device I saw. It keeps TipSwitch and InRange
at 1 for fingers that are not touching the panel.
The solution is to rely on the field ContactCount, which is accurate
as the correct information are packed at the begining of the frame.

Unfortunately, CountactCount is most of the time at the end of the report.
The solution is to pick it when we have the whole report in raw_event.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

2 files changed, 33 insertions, 6 deletions

diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 34e25471aeaa..8311380c76f6 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -597,6 +597,9 @@
 #define USB_VENDOR_ID_NEC               0x073e
 #define USB_DEVICE_ID_NEC_USB_GAME_PAD  0x0301
 
+#define USB_VENDOR_ID_NEXIO             0x1870
+#define USB_DEVICE_ID_NEXIO_MULTITOUCH_420      0x010d
+
 #define USB_VENDOR_ID_NEXTWINDOW        0x1926
 #define USB_DEVICE_ID_NEXTWINDOW_TOUCHSCREEN    0x0003
 
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 13b94619b5d0..87690e2726ac 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -54,6 +54,7 @@ MODULE_LICENSE("GPL");
 #define MT_QUIRK_NO_AREA                (1 << 9)
 #define MT_QUIRK_IGNORE_DUPLICATES      (1 << 10)
 #define MT_QUIRK_HOVERING               (1 << 11)
+#define MT_QUIRK_CONTACT_CNT_ACCURATE   (1 << 12)
 
 struct mt_slot {
         __s32 x, y, cx, cy, p, w, h;
@@ -83,6 +84,7 @@ struct mt_device {
         struct mt_class mtclass;        /* our mt device class */
         struct mt_fields *fields;       /* temporary placeholder for storing the
                                            multitouch fields */
+        __s32 *contactcount;            /* contact count value in the report */
         unsigned last_field_index;      /* last field index of the report */
         unsigned last_slot_field;       /* the last field of a slot */
         unsigned mt_report_id;  /* the report ID of the multitouch device */
@@ -112,6 +114,7 @@ struct mt_device {
 #define MT_CLS_DUAL_INRANGE_CONTACTNUMBER       0x0007
 #define MT_CLS_DUAL_NSMU_CONTACTID              0x0008
 #define MT_CLS_INRANGE_CONTACTNUMBER            0x0009
+#define MT_CLS_ALWAYS_TRUE                      0x000a
 
 /* vendor specific classes */
 #define MT_CLS_3M                               0x0101
@@ -171,6 +174,9 @@ static struct mt_class mt_classes[] = {
         { .name = MT_CLS_INRANGE_CONTACTNUMBER,
                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
                         MT_QUIRK_SLOT_IS_CONTACTNUMBER },
+        { .name = MT_CLS_ALWAYS_TRUE,
+                .quirks = MT_QUIRK_ALWAYS_VALID |
+                        MT_QUIRK_CONTACT_CNT_ACCURATE },
 
         /*
          * vendor specific classes
@@ -251,6 +257,9 @@ static ssize_t mt_set_quirks(struct device *dev,
 
         td->mtclass.quirks = val;
 
+        if (!td->contactcount)
+                td->mtclass.quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
+
         return count;
 }
 
@@ -461,6 +470,7 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
                         td->last_field_index = field->index;
                         return 1;
                 case HID_DG_CONTACTCOUNT:
+                        td->contactcount = field->value + usage->usage_index;
                         td->last_field_index = field->index;
                         return 1;
                 case HID_DG_CONTACTMAX:
@@ -525,6 +535,10 @@ static int mt_compute_slot(struct mt_device *td, struct input_dev *input)
  */
 static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
 {
+        if ((td->mtclass.quirks & MT_QUIRK_CONTACT_CNT_ACCURATE) &&
+            td->num_received >= td->num_expected)
+                return;
+
         if (td->curvalid || (td->mtclass.quirks & MT_QUIRK_ALWAYS_VALID)) {
                 int slotnum = mt_compute_slot(td, input);
                 struct mt_slot *s = &td->curdata;
@@ -635,12 +649,6 @@ static void mt_process_mt_event(struct hid_device *hid, struct hid_field *field,
                         td->curdata.h = value;
                         break;
                 case HID_DG_CONTACTCOUNT:
-                        /*
-                         * Includes multi-packet support where subsequent
-                         * packets are sent with zero contactcount.
-                         */
-                        if (value)
-                                td->num_expected = value;
                         break;
                 case HID_DG_TOUCH:
                         /* do nothing */
@@ -676,6 +684,13 @@ static void mt_report(struct hid_device *hid, struct hid_report *report)
         if (!(hid->claimed & HID_CLAIMED_INPUT))
                 return;
 
+        /*
+         * Includes multi-packet support where subsequent
+         * packets are sent with zero contactcount.
+         */
+        if (td->contactcount && *td->contactcount)
+                td->num_expected = *td->contactcount;
+
         for (r = 0; r < report->maxfield; r++) {
                 field = report->field[r];
                 count = field->report_count;
@@ -750,11 +765,15 @@ static void mt_post_parse_default_settings(struct mt_device *td)
 static void mt_post_parse(struct mt_device *td)
 {
         struct mt_fields *f = td->fields;
+        struct mt_class *cls = &td->mtclass;
 
         if (td->touches_by_report > 0) {
                 int field_count_per_touch = f->length / td->touches_by_report;
                 td->last_slot_field = f->usages[field_count_per_touch - 1];
         }
+
+        if (!td->contactcount)
+                cls->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
 }
 
 static void mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
@@ -1087,6 +1106,11 @@ static const struct hid_device_id mt_devices[] = {
                 MT_USB_DEVICE(USB_VENDOR_ID_TURBOX,
                         USB_DEVICE_ID_TURBOX_TOUCHSCREEN_MOSART) },
 
+        /* Nexio panels */
+        { .driver_data = MT_CLS_ALWAYS_TRUE,
+                MT_USB_DEVICE(USB_VENDOR_ID_NEXIO,
+                        USB_DEVICE_ID_NEXIO_MULTITOUCH_420)},
+
         /* Panasonic panels */
         { .driver_data = MT_CLS_PANASONIC,
                 MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,