* HID driver for 3M PCT multitouch panels
*
* Copyright (c) 2009-2010 Stephane Chatty <chatty@enac.fr>
+ * Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se>
+ * Copyright (c) 2010 Canonical, Ltd.
*
*/
#include "hid-ids.h"
+#define MAX_SLOTS 60
+#define MAX_TRKID USHRT_MAX
+#define MAX_EVENTS 360
+
+/* estimated signal-to-noise ratios */
+#define SN_MOVE 2048
+#define SN_WIDTH 128
+
struct mmm_finger {
__s32 x, y, w, h;
- __u8 rank;
+ __u16 id;
+ bool prev_touch;
bool touch, valid;
};
struct mmm_data {
- struct mmm_finger f[10];
- __u8 curid, num;
+ struct mmm_finger f[MAX_SLOTS];
+ __u16 id;
+ __u8 curid;
+ __u8 nexp, nreal;
bool touch, valid;
};
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
+ int f1 = field->logical_minimum;
+ int f2 = field->logical_maximum;
+ int df = f2 - f1;
+
switch (usage->hid & HID_USAGE_PAGE) {
case HID_UP_BUTTON:
case HID_GD_X:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_X);
+ input_set_abs_params(hi->input, ABS_MT_POSITION_X,
+ f1, f2, df / SN_MOVE, 0);
/* touchscreen emulation */
input_set_abs_params(hi->input, ABS_X,
- field->logical_minimum,
- field->logical_maximum, 0, 0);
+ f1, f2, df / SN_MOVE, 0);
return 1;
case HID_GD_Y:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_Y);
+ input_set_abs_params(hi->input, ABS_MT_POSITION_Y,
+ f1, f2, df / SN_MOVE, 0);
/* touchscreen emulation */
input_set_abs_params(hi->input, ABS_Y,
- field->logical_minimum,
- field->logical_maximum, 0, 0);
+ f1, f2, df / SN_MOVE, 0);
return 1;
}
return 0;
case HID_DG_TIPSWITCH:
/* touchscreen emulation */
hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
+ input_set_capability(hi->input, EV_KEY, BTN_TOUCH);
return 1;
case HID_DG_WIDTH:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_TOUCH_MAJOR);
+ input_set_abs_params(hi->input, ABS_MT_TOUCH_MAJOR,
+ f1, f2, df / SN_WIDTH, 0);
return 1;
case HID_DG_HEIGHT:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_TOUCH_MINOR);
+ input_set_abs_params(hi->input, ABS_MT_TOUCH_MINOR,
+ f1, f2, df / SN_WIDTH, 0);
input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
- 1, 1, 0, 0);
+ 0, 1, 0, 0);
return 1;
case HID_DG_CONTACTID:
- field->logical_maximum = 59;
+ field->logical_maximum = MAX_TRKID;
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_TRACKING_ID);
+ input_set_abs_params(hi->input, ABS_MT_TRACKING_ID,
+ 0, MAX_TRKID, 0, 0);
+ if (!hi->input->mt)
+ input_mt_create_slots(hi->input, MAX_SLOTS);
+ input_set_events_per_packet(hi->input, MAX_EVENTS);
return 1;
}
/* let hid-input decide for the others */
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
+ /* tell hid-input to skip setup of these event types */
if (usage->type == EV_KEY || usage->type == EV_ABS)
- clear_bit(usage->code, *bit);
-
- return 0;
+ set_bit(usage->type, hi->input->evbit);
+ return -1;
}
/*
static void mmm_filter_event(struct mmm_data *md, struct input_dev *input)
{
struct mmm_finger *oldest = 0;
- bool pressed = false, released = false;
int i;
-
- /*
- * we need to iterate on all fingers to decide if we have a press
- * or a release event in our touchscreen emulation.
- */
- for (i = 0; i < 10; ++i) {
+ for (i = 0; i < MAX_SLOTS; ++i) {
struct mmm_finger *f = &md->f[i];
if (!f->valid) {
/* this finger is just placeholder data, ignore */
- } else if (f->touch) {
+ continue;
+ }
+ input_mt_slot(input, i);
+ if (f->touch) {
/* this finger is on the screen */
int wide = (f->w > f->h);
- input_event(input, EV_ABS, ABS_MT_TRACKING_ID, i);
+ /* divided by two to match visual scale of touch */
+ int major = max(f->w, f->h) >> 1;
+ int minor = min(f->w, f->h) >> 1;
+
+ if (!f->prev_touch)
+ f->id = md->id++;
+ input_event(input, EV_ABS, ABS_MT_TRACKING_ID, f->id);
input_event(input, EV_ABS, ABS_MT_POSITION_X, f->x);
input_event(input, EV_ABS, ABS_MT_POSITION_Y, f->y);
input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
- input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR,
- wide ? f->w : f->h);
- input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR,
- wide ? f->h : f->w);
- input_mt_sync(input);
- /*
- * touchscreen emulation: maintain the age rank
- * of this finger, decide if we have a press
- */
- if (f->rank == 0) {
- f->rank = ++(md->num);
- if (f->rank == 1)
- pressed = true;
- }
- if (f->rank == 1)
+ input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
+ input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
+ /* touchscreen emulation: pick the oldest contact */
+ if (!oldest || ((f->id - oldest->id) & (SHRT_MAX + 1)))
oldest = f;
} else {
/* this finger took off the screen */
- /* touchscreen emulation: maintain age rank of others */
- int j;
-
- for (j = 0; j < 10; ++j) {
- struct mmm_finger *g = &md->f[j];
- if (g->rank > f->rank) {
- g->rank--;
- if (g->rank == 1)
- oldest = g;
- }
- }
- f->rank = 0;
- --(md->num);
- if (md->num == 0)
- released = true;
+ input_event(input, EV_ABS, ABS_MT_TRACKING_ID, -1);
}
+ f->prev_touch = f->touch;
f->valid = 0;
}
/* touchscreen emulation */
if (oldest) {
- if (pressed)
- input_event(input, EV_KEY, BTN_TOUCH, 1);
+ input_event(input, EV_KEY, BTN_TOUCH, 1);
input_event(input, EV_ABS, ABS_X, oldest->x);
input_event(input, EV_ABS, ABS_Y, oldest->y);
- } else if (released) {
+ } else {
input_event(input, EV_KEY, BTN_TOUCH, 0);
}
+ input_sync(input);
}
/*
md->f[md->curid].h = value;
break;
case HID_DG_CONTACTID:
+ value = clamp_val(value, 0, MAX_SLOTS - 1);
if (md->valid) {
md->curid = value;
md->f[value].touch = md->touch;
md->f[value].valid = 1;
+ md->nreal++;
}
break;
case HID_GD_X:
md->f[md->curid].y = value;
break;
case HID_DG_CONTACTCOUNT:
- mmm_filter_event(md, input);
+ if (value)
+ md->nexp = value;
+ if (md->nreal >= md->nexp) {
+ mmm_filter_event(md, input);
+ md->nreal = 0;
+ }
break;
}
}
int ret;
struct mmm_data *md;
+ hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
+
md = kzalloc(sizeof(struct mmm_data), GFP_KERNEL);
if (!md) {
- dev_err(&hdev->dev, "cannot allocate 3M data\n");
+ hid_err(hdev, "cannot allocate 3M data\n");
return -ENOMEM;
}
hid_set_drvdata(hdev, md);
projects / mirror_ubuntu-bionic-kernel.git / blobdiff