HID: hid-multitouch: migrate 3M PCT touch screens to hid-multitouch

This patch merges the hid-3m-pct driver into hid-multitouch.
To keep devices working the same way they used to with hid-3m-pct,
we need to add two signal/noise ratios for width and height.
We also need to work on width/height to send proper
ABS_MT_ORIENTATION flag.

Importing 3M into hid-multitouch also solved the bug in which
devices handling width and height in their report descriptors
did not show ABS_MT_TOUCH_MAJOR and ABS_MT_TOUCH_MINOR.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@enac.fr>
Reviewed-by: Stéphane Chatty <chatty@enac.fr>
Reviewed-and-tested-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 45 insertions, 2 deletions

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index d31301e85c56..0175f8583095 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -11,6 +11,12 @@
  *  Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se>
  *  Copyright (c) 2010 Canonical, Ltd.
  *
+ *  This code is partly based on hid-3m-pct.c:
+ *
+ *  Copyright (c) 2009-2010 Stephane Chatty <chatty@enac.fr>
+ *  Copyright (c) 2010      Henrik Rydberg <rydberg@euromail.se>
+ *  Copyright (c) 2010      Canonical, Ltd.
+ *
  */
 
 /*
@@ -69,6 +75,8 @@ struct mt_class {
         __s32 name;     /* MT_CLS */
         __s32 quirks;
         __s32 sn_move;  /* Signal/noise ratio for move events */
+        __s32 sn_width; /* Signal/noise ratio for width events */
+        __s32 sn_height;        /* Signal/noise ratio for height events */
         __s32 sn_pressure;      /* Signal/noise ratio for pressure events */
         __u8 maxcontacts;
 };
@@ -80,6 +88,7 @@ struct mt_class {
 #define MT_CLS_CYPRESS                          4
 #define MT_CLS_EGALAX                           5
 #define MT_CLS_STANTUM                          6
+#define MT_CLS_3M                               7
 
 #define MT_DEFAULT_MAXCONTACT   10
 
@@ -141,6 +150,12 @@ struct mt_class mt_classes[] = {
         },
         { .name = MT_CLS_STANTUM,
                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE },
+        { .name = MT_CLS_3M,
+                .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
+                        MT_QUIRK_SLOT_IS_CONTACTID,
+                .sn_move = 2048,
+                .sn_width = 128,
+                .sn_height = 128 },
 
         { }
 };
@@ -230,11 +245,15 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
                 case HID_DG_WIDTH:
                         hid_map_usage(hi, usage, bit, max,
                                         EV_ABS, ABS_MT_TOUCH_MAJOR);
+                        set_abs(hi->input, ABS_MT_TOUCH_MAJOR, field,
+                                cls->sn_width);
                         td->last_slot_field = usage->hid;
                         return 1;
                 case HID_DG_HEIGHT:
                         hid_map_usage(hi, usage, bit, max,
                                         EV_ABS, ABS_MT_TOUCH_MINOR);
+                        set_abs(hi->input, ABS_MT_TOUCH_MINOR, field,
+                                cls->sn_height);
                         input_set_abs_params(hi->input,
                                         ABS_MT_ORIENTATION, 0, 1, 0, 0);
                         td->last_slot_field = usage->hid;
@@ -332,11 +351,18 @@ static void mt_emit_event(struct mt_device *td, struct input_dev *input)
                 input_mt_report_slot_state(input, MT_TOOL_FINGER,
                         s->touch_state);
                 if (s->touch_state) {
+                        /* this finger is on the screen */
+                        int wide = (s->w > s->h);
+                        /* divided by two to match visual scale of touch */
+                        int major = max(s->w, s->h) >> 1;
+                        int minor = min(s->w, s->h) >> 1;
+
                         input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
                         input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
+                        input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
                         input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
-                        input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, s->w);
-                        input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, s->h);
+                        input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
+                        input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
                 }
                 s->seen_in_this_frame = false;
 
@@ -398,6 +424,15 @@ static int mt_event(struct hid_device *hid, struct hid_field *field,
                         break;
 
                 default:
+                        if (td->last_field_index
+                                && field->index == td->last_field_index)
+                                /* we reach here when the last field in the
+                                 * report is not related to multitouch.
+                                 * This is not good. As a temporary solution,
+                                 * we trigger our mt event completion and
+                                 * ignore the field.
+                                 */
+                                break;
                         /* fallback to the generic hidinput handling */
                         return 0;
                 }
@@ -513,6 +548,14 @@ static void mt_remove(struct hid_device *hdev)
 
 static const struct hid_device_id mt_devices[] = {
 
+        /* 3M panels */
+        { .driver_data = MT_CLS_3M,
+                HID_USB_DEVICE(USB_VENDOR_ID_3M,
+                        USB_DEVICE_ID_3M1968) },
+        { .driver_data = MT_CLS_3M,
+                HID_USB_DEVICE(USB_VENDOR_ID_3M,
+                        USB_DEVICE_ID_3M2256) },
+
         /* Cando panels */
         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
                 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,