int retval; retval = request_irq(UART_IRQ, my_uart_interrupt, IRQF_SHARED, "my_uart", NULL); if (retval) printk(KERN_ERR "my_uart: unable to request IRQ\n"); return retval;
: In the Linux ecosystem, support for the 16C95x is typically baked into the kernel's 8250 or serial core drivers. Because the 16C950 is backward compatible with the 16550, the kernel automatically detects the enhanced features (like the larger FIFO) and enables them via the standard serial interface ( /dev/ttyS* ). Implementation in Industrial Contexts 16c95x serial port driver
Transmit refill (outline)
: These drivers support deep FIFO (First-In, First-Out) buffers —typically 128 or 256 bytes—which significantly reduce CPU overhead compared to standard 16550 UARTs (which have only 16-byte buffers). Common Use Cases You will typically encounter this driver on: retval = request_irq(UART_IRQ