New solution to haptic touchpad

install/config/hardware/dell/fix-xps-haptic-touchpad.sh

@@ -1,31 +1,35 @@
-# Fix Dell XPS haptic touchpad losing haptic feedback after suspend/resume.
-# The I2C controller's runtime power management aggressively suspends the touchpad,
-# and on resume the haptic engine sometimes fails to reinitialize.
-# This udev rule keeps the I2C controller always on to prevent that.
-# Applies to any Dell XPS with the Synaptics haptic touchpad (06CB:D01A).
+# Fix Dell XPS haptic touchpad.
+# The Synaptics haptic touchpad (06CB:D01A) uses the HID Manual Trigger
+# protocol, but the kernel's HID haptic subsystem only supports Auto Trigger.
+# This sets up a lightweight daemon that monitors touchpad button events and
+# sends haptic pulses via HID feature reports on the hidraw device.
+# Also disables I2C runtime PM to prevent the haptic engine losing state
+# across suspend/resume.
 
 if omarchy-hw-match "XPS" \
   && ls /sys/bus/i2c/devices/i2c-VEN_06CB:00 2>/dev/null; then
 
-  # Disable runtime PM for I2C controller so haptic state isn't lost
+  # Keep I2C controller power on to prevent haptic engine losing state
   sudo tee /etc/udev/rules.d/99-dell-xps-haptic-touchpad.rules << 'EOF'
 ACTION=="add", SUBSYSTEM=="pci", KERNEL=="0000:00:19.0", ATTR{power/control}="on"
 ACTION=="add", SUBSYSTEM=="platform", KERNEL=="i2c_designware.0", ATTR{power/control}="on"
 EOF
   sudo udevadm control --reload-rules
 
-  # Rebind the I2C HID touchpad on boot and resume to reinitialize haptic engine
-  sudo tee /etc/systemd/system/dell-xps-haptic-touchpad.service << 'SVC'
+  # Haptic feedback daemon as a systemd service
+  sudo tee /etc/systemd/system/dell-xps-haptic-touchpad.service << SVC
 [Unit]
-Description=Rebind Dell XPS haptic touchpad
+Description=Dell XPS haptic touchpad feedback
 After=systemd-udev-settle.service
 
 [Service]
-Type=oneshot
-ExecStart=/bin/bash -c 'if [[ -d /sys/bus/i2c/devices/i2c-VEN_06CB:00 ]]; then echo "i2c-VEN_06CB:00" | tee /sys/bus/i2c/drivers/i2c_hid_acpi/unbind > /dev/null 2>&1; sleep 1; echo "i2c-VEN_06CB:00" | tee /sys/bus/i2c/drivers/i2c_hid_acpi/bind > /dev/null 2>&1; fi'
+Type=simple
+ExecStart=$OMARCHY_PATH/bin/omarchy-haptic-touchpad
+Restart=on-failure
+RestartSec=2
 
 [Install]
-WantedBy=multi-user.target suspend.target hibernate.target
+WantedBy=multi-user.target
 SVC
   sudo systemctl daemon-reload
   sudo systemctl enable dell-xps-haptic-touchpad.service