This wired USB phone is based off of a Holtek Semiconductor MCU, and is recognized in Linux as a "GoodCom WJT602" USB audio device, with a HID input device:

[45395.505831] input: GoodCom WJT602 USB Audio Device as /devices/pci0000:00/0000:00:1d.0/usb1/1-2/1-2:1.3/input/input23 [45395.560226] input,hiddev96,hidraw0: USB HID v1.10 Device [GoodCom WJT602 USB Audio Device] on usb-0000:00:1d.0-2

lsusb reports this device as:

$ lsusb -d 04d9:0602 Bus 001 Device 004: ID 04d9:0602 Holtek Semiconductor, Inc. $

What does libip-usbph do?

The library has APIs for the following:

• Setting all symbols on the LCD
• A built-in ASCII to 14-segment LCD font converter
• Backlight control
• Keypad events

The library does not control the microphone nor the speaker of the phone - use the standard Linux ALSA USB audio for those services.

License

This clean-room engineered library is licensed under the LGPL.