Edge2 (Android): How to Enable Wake on Touch?

Edge2 Android
1

Hello everyone,

I’m currently using an Edge2 running Android 14 (v241101) along with a touchscreen. I’ve set a display timeout in the Android settings, which works as expected.

One feature that I absolutely rely on is “Wake on Touch” – the ability to wake the display simply by touching the screen, without pressing any hardware buttons.
This feature works flawlessly on my current Android-based SBC using the same touchscreen.

For my use case, this feature is not just nice to have – it’s essential.
Without it, I simply can’t switch to the Edge2 for my project.

So my question is:

How can I get “Wake on Touch” working on the Edge2?

Any help or suggestions would be greatly appreciated.

Thanks in advance!

Best Regards
Nellor

2

Hi, you can read this post, maybe it will help you

3

Thanks for your help. I tried the update.img and, as mentioned in the post, it is possible to wake the display using a connected USB mouse. However, it is still not possible to wake the display by touching the screen.

4

Hello, what type of touch screen are you using?

5

I am using a Hannspree HT225HPB 21.5" (VID: 2575 PID: 0401) connected via HDMI and USB for touch screen functionality.

6

Hello, I thought it was a MIPI screen. If it is HDMI, I have a touch screen but it has been taken away. It will take about a week to get back to me. I can only verify it and then reply to you. Is that ok?

7

ok no problem, thank you. I suspect this is a fundamental problem. I have another noname touchscreen (VID: 1a86 PID: e5e3) that also supports the “Wake on Touch” feature on my other Android-based SBC.
With this touchscreen, “Wake on Touch” does not work on the Edge2 either.

8

@Nellor
You can test it according to the two modifications below. I verified it on my touchable HDMI monitor.

Using an external USB device to wake up the device

xiong@builder:~/work/edge2-14/kernel-6.1$ git diff
diff --git a/drivers/misc/khadas-mcu.c b/drivers/misc/khadas-mcu.c
index 17fe564e4b75..2f3a9c89df3a 100644
--- a/drivers/misc/khadas-mcu.c
+++ b/drivers/misc/khadas-mcu.c
@@ -20,6 +20,7 @@
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/wakelock.h>
 
 /* Device registers */
 #define MCU_PWR_OFF_CMD_REG             0x80
@@ -112,6 +113,7 @@ struct mcu_data {
 
 struct mcu_data *g_mcu_data;
 int ageing_test_flag = 0;
+static struct wake_lock wake_lock_always;
 
 static int i2c_master_reg8_send(const struct i2c_client *client,
                const char reg, const char *buf, int count)
@@ -761,6 +763,8 @@ static int mcu_probe(struct i2c_client *client, const struct i2c_device_id *id)
        schedule_delayed_work(&g_mcu_data->fan_data.work, MCU_FAN_LOOP_SECS);
        create_mcu_attrs();
 
+       wake_lock_init(&wake_lock_always, WAKE_LOCK_SUSPEND, "wake_lock_always");
+
        return 0;
 }
 
@@ -780,12 +784,14 @@ static int khadas_fan_suspend(struct device *dev)
 {
        cancel_delayed_work(&g_mcu_data->fan_data.work);
        mcu_fan_level_set(&g_mcu_data->fan_data, 0);
+       wake_lock(&wake_lock_always);
 
        return 0;
 }
 
 static int khadas_fan_resume(struct device *dev)
 {
+       wake_unlock(&wake_lock_always);
        khadas_fan_set(&g_mcu_data->fan_data);
 
        return 0;

Modify the touch device so that it is not turned off when the system is in sleep mode

xiong@builder:~/work/edge2-14/frameworks/native$ git diff
diff --git a/services/inputflinger/reader/mapper/TouchInputMapper.cpp b/services/inputflinger/reader/mapper/TouchInputMapper.cpp
index ca9f1ba4ae..8b9ce3f0c4 100644
--- a/services/inputflinger/reader/mapper/TouchInputMapper.cpp
+++ b/services/inputflinger/reader/mapper/TouchInputMapper.cpp
@@ -973,7 +973,7 @@ void TouchInputMapper::configureInputDevice(nsecs_t when, bool* outResetNeeded)
     } else if (!mParameters.enableForInactiveViewport && !newViewportOpt->isActive) {
         ALOGI("Disabling %s (device %i) because the associated viewport is not active",
               getDeviceName().c_str(), getDeviceId());
-        mDeviceMode = DeviceMode::DISABLED;
+        //mDeviceMode = DeviceMode::DISABLED;
     }
 
     // Raw width and height in the natural orientation.
9

Hi @xiong.zhang, with your two modifications, the “Wake on Touch” feature now works with the Edge2. Thank you so much! :grinning_face:

I wonder if this could be implemented in the official image? Or at least adjustable via “Khadas Settings”? Actually, I would like to avoid building images for Edge2 myself.

10

Our main feature is the touch wake-up of the MIPI screen. You can pull the latest code and generate your own firmware. Sorry.