* HID driver for eGalax dual-touch panels
*
* Copyright (c) 2010 Stephane Chatty <chatty@enac.fr>
+ * Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se>
+ * Copyright (c) 2010 Canonical, Ltd.
*
*/
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/usb.h>
+#include <linux/input/mt.h>
#include <linux/slab.h>
#include "usbhid/usbhid.h"
#include "hid-ids.h"
+#define MAX_SLOTS 2
+
+/* estimated signal-to-noise ratios */
+#define SN_MOVE 4096
+#define SN_PRESSURE 32
+
struct egalax_data {
- __u16 x, y, z;
- __u8 id;
- bool first; /* is this the first finger in the frame? */
- bool valid; /* valid finger data, or just placeholder? */
- bool activity; /* at least one active finger previously? */
- __u16 lastx, lasty, lastz; /* latest valid (x, y, z) in the frame */
+ int valid;
+ int slot;
+ int touch;
+ int x, y, z;
};
+static void set_abs(struct input_dev *input, unsigned int code,
+ struct hid_field *field, int snratio)
+{
+ int fmin = field->logical_minimum;
+ int fmax = field->logical_maximum;
+ int fuzz = snratio ? (fmax - fmin) / snratio : 0;
+ input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
+}
+
static int egalax_input_mapping(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
+ struct input_dev *input = hi->input;
+
switch (usage->hid & HID_USAGE_PAGE) {
case HID_UP_GENDESK:
switch (usage->hid) {
case HID_GD_X:
+ field->logical_maximum = 32760;
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_X);
+ set_abs(input, ABS_MT_POSITION_X, field, SN_MOVE);
/* touchscreen emulation */
- input_set_abs_params(hi->input, ABS_X,
- field->logical_minimum,
- field->logical_maximum, 0, 0);
+ set_abs(input, ABS_X, field, SN_MOVE);
return 1;
case HID_GD_Y:
+ field->logical_maximum = 32760;
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_Y);
+ set_abs(input, ABS_MT_POSITION_Y, field, SN_MOVE);
/* touchscreen emulation */
- input_set_abs_params(hi->input, ABS_Y,
- field->logical_minimum,
- field->logical_maximum, 0, 0);
+ set_abs(input, ABS_Y, field, SN_MOVE);
return 1;
}
return 0;
case HID_DG_TIPSWITCH:
/* touchscreen emulation */
hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
+ input_set_capability(input, EV_KEY, BTN_TOUCH);
return 1;
case HID_DG_INRANGE:
case HID_DG_CONFIDENCE:
case HID_DG_CONTACTMAX:
return -1;
case HID_DG_CONTACTID:
- hid_map_usage(hi, usage, bit, max,
- EV_ABS, ABS_MT_TRACKING_ID);
+ input_mt_init_slots(input, MAX_SLOTS);
return 1;
case HID_DG_TIPPRESSURE:
+ field->logical_minimum = 0;
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_PRESSURE);
+ set_abs(input, ABS_MT_PRESSURE, field, SN_PRESSURE);
/* touchscreen emulation */
- input_set_abs_params(hi->input, ABS_PRESSURE,
- field->logical_minimum,
- field->logical_maximum, 0, 0);
+ set_abs(input, ABS_PRESSURE, field, SN_PRESSURE);
return 1;
}
return 0;
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 egalax_filter_event(struct egalax_data *td, struct input_dev *input)
{
- td->first = !td->first; /* touchscreen emulation */
-
- if (td->valid) {
- /* emit multitouch events */
- input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id);
- input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x >> 3);
- input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y >> 3);
+ input_mt_slot(input, td->slot);
+ input_mt_report_slot_state(input, MT_TOOL_FINGER, td->touch);
+ if (td->touch) {
+ input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x);
+ input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y);
input_event(input, EV_ABS, ABS_MT_PRESSURE, td->z);
-
- input_mt_sync(input);
-
- /*
- * touchscreen emulation: store (x, y) as
- * the last valid values in this frame
- */
- td->lastx = td->x;
- td->lasty = td->y;
- td->lastz = td->z;
- }
-
- /*
- * touchscreen emulation: if this is the second finger and at least
- * one in this frame is valid, the latest valid in the frame is
- * the oldest on the panel, the one we want for single touch
- */
- if (!td->first && td->activity) {
- input_event(input, EV_ABS, ABS_X, td->lastx >> 3);
- input_event(input, EV_ABS, ABS_Y, td->lasty >> 3);
- input_event(input, EV_ABS, ABS_PRESSURE, td->lastz);
- }
-
- if (!td->valid) {
- /*
- * touchscreen emulation: if the first finger is invalid
- * and there previously was finger activity, this is a release
- */
- if (td->first && td->activity) {
- input_event(input, EV_KEY, BTN_TOUCH, 0);
- td->activity = false;
- }
- return;
- }
-
-
- /* touchscreen emulation: if no previous activity, emit touch event */
- if (!td->activity) {
- input_event(input, EV_KEY, BTN_TOUCH, 1);
- td->activity = true;
}
+ input_mt_report_pointer_emulation(input, true);
}
-
static int egalax_event(struct hid_device *hid, struct hid_field *field,
struct hid_usage *usage, __s32 value)
{
* uses a standard parallel multitouch protocol (product ID ==
* 48xx). The second is capacitive and uses an unusual "serial"
* protocol with a different message for each multitouch finger
- * (product ID == 72xx). We do not yet generate a correct event
- * sequence for the capacitive/serial protocol.
+ * (product ID == 72xx).
*/
if (hid->claimed & HID_CLAIMED_INPUT) {
struct input_dev *input = field->hidinput->input;
switch (usage->hid) {
case HID_DG_INRANGE:
+ td->valid = value;
+ break;
case HID_DG_CONFIDENCE:
/* avoid interference from generic hidinput handling */
break;
case HID_DG_TIPSWITCH:
- td->valid = value;
+ td->touch = value;
break;
case HID_DG_TIPPRESSURE:
td->z = value;
break;
case HID_DG_CONTACTID:
- td->id = value;
+ td->slot = clamp_val(value, 0, MAX_SLOTS - 1);
break;
case HID_GD_X:
td->x = value;
case HID_GD_Y:
td->y = value;
/* this is the last field in a finger */
- egalax_filter_event(td, input);
+ if (td->valid)
+ egalax_filter_event(td, input);
break;
case HID_DG_CONTACTCOUNT:
/* touch emulation: this is the last field in a frame */
- td->first = false;
break;
default:
USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) },
{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH1) },
+ { HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
+ USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH2) },
+ { HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
+ USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH3) },
+ { HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
+ USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH4) },
{ }
};
MODULE_DEVICE_TABLE(hid, egalax_devices);
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