Using a PS2 Controller on PSP: Not Possible Directly (Here's Why)

You cannot connect a PS2 controller directly to a PSP.

• Port Mismatch: PS2 = USB (host); PSP = proprietary serial (device) + USB device port (for host accessories like GPS/camera).
• Protocol: PS2 uses Sony's bidirectional controller protocol; PSP expects its own peripheral protocol.
• Driver Stack: PSP firmware has no HID class driver for PS2 pads.

Workarounds (Impractical)

• PS2→USB Adapter + USB Host Hack (CFW): Requires custom firmware + kernel plugin (e.g., USBHostFS + custom driver)—extremely unstable, near-zero game support.
• Bluetooth Adapter + PS2→BT Dongle: PSP Go / 3000 have Bluetooth but only for Sony BT headsets/keyboards; no generic HID support.

Real Solution

Use the PSP's built-in controls or a PSP-compatible accessory (e.g., PSP-300 video out cable + DualShock 3 via Bluetooth on PSP Go with CFW plugin—still experimental).

Bottom line: Not feasible for normal use.