static irqreturn_t uart_rxint(int irq, void *dev_id)
// interrupt handler or interrupt service routine (ISR)
// read this - http://www.makelinux.net/books/lkd2/?u=ch06lev1sec3
// static irqreturn_t intr_handler(int irq, void *dev_id, struct pt_regs *regs)
{
struct uart_port *port = (struct uart_port *) dev_id;
struct tty_struct *tty = port->state->port.tty;
// What is the use of this ?
unsigned int status, data;
/* ... */
do {
/* ... */
/* Read data */
data = uart_getc(port);
/* Normal, overrun, parity, frame error? */
status = uart_status(port);
/* Dispatch to the tty layer */
tty_insert_flip_char(tty, data, status);
/* ... */
} while (more_chars_to_be_read()); /* More chars */
/* ... */
tty_flip_buffer_push(tty);
return IRQ_HANDLED;
}
irqreturn_t usb_uart_rxint(int irq, void *dev_id)
{
unsigned int data, status;
struct uart_port *port = (struct uart_port*)dev_id;
struct tty_struct *tty = port->state->port.tty;
do {
data = usb_uart_getc(port);
status = usb_uart_status(port);
tty_insert_flip_char(tty, data, status);
} while(more_chars_to_be_read());
return IRQ_HANDLED;
}
