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static int dr_probe(struct hid_device *hdev, const struct hid_device_id *id) { // Send init command: report ID 0, data {0x01, 0x02} // Required for DragonRise to start sending input reports. // Set raw input report size (usually 8 or 12 bytes) // Map bytes to ABS_X, ABS_Y, ABS_RX, ABS_RY, etc. // Buttons are bit-packed across bytes 4-7 (or 8-11)
Today, millions of cheap USB gamepads and joysticks (many sold as “PS3/PC USB controller”) just work on Linux thanks to a 500-line driver written a decade ago. From hid-dr.c (simplified): dragonrise inc. generic usb joystick driver
// Register as a joystick input device } From hid-dr
These devices all share a common (DragonRise) and various product IDs. Internally, they use a simple, undocumented HID (Human Interface Device) protocol — not standard USB HID gamepad class, but a custom, fixed-byte report format. they use a simple
static int dr_probe(struct hid_device *hdev, const struct hid_device_id *id) { // Send init command: report ID 0, data {0x01, 0x02} // Required for DragonRise to start sending input reports. // Set raw input report size (usually 8 or 12 bytes) // Map bytes to ABS_X, ABS_Y, ABS_RX, ABS_RY, etc. // Buttons are bit-packed across bytes 4-7 (or 8-11)
Today, millions of cheap USB gamepads and joysticks (many sold as “PS3/PC USB controller”) just work on Linux thanks to a 500-line driver written a decade ago. From hid-dr.c (simplified):
// Register as a joystick input device }
These devices all share a common (DragonRise) and various product IDs. Internally, they use a simple, undocumented HID (Human Interface Device) protocol — not standard USB HID gamepad class, but a custom, fixed-byte report format.
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