-vis On S3c2410x Delta Driver -

: This often refers to specific communication or interface drivers (such as those for Delta PLCs or Delta Electronics human-machine interfaces) adapted for an ARM-based environment.

: Delta drivers often support both ASCII and RTU modes.

The -vis subsystem is not a standard mainline Linux driver. Instead, it is a lean middleware layer that sits between the s3c2410fb (framebuffer) and the s3c2410-lcd controller. Its purpose: for screen regions.

return IRQ_NONE;