style: clean up api

- adjust some methods to private
- mark some methods as unsafe
- remove toggle methods
- add tests

Author: qwandor

uart8250/src/lib.rs

@@ -8,7 +8,7 @@ This crate provides a struct with many methods to operate an 8250 UART.
 
 #![no_std]
 
-pub mod registers;
+mod registers;
 mod uart;
 
-pub use uart::{ChipFifoInfo, InterruptType, MmioUart8250, Parity, IER, LSR, MSR};
+pub use uart::{ChipFifoInfo, InterruptType, MmioUart8250, Parity};

uart8250/src/registers.rs

@@ -36,7 +36,7 @@ pub struct Registers {
 
 impl Registers {
     /// Constructs a new instance of the UART registers starting at the given base address.
-    pub fn from_base_address(base_address: usize) -> &'static mut Self {
-        unsafe { &mut *(base_address as *mut crate::registers::Registers) }
+    pub unsafe fn from_base_address(base_address: usize) -> &'static mut Self {
+        &mut *(base_address as *mut crate::registers::Registers)
     }
 }