static void ipoctal_irq_channel()

in devices/ipoctal.c [221:251]

• 20 lines of code
• 9 McCabe index (conditional complexity)

static void ipoctal_irq_channel(struct ipoctal_channel *channel)
{
	u8 isr, sr;

	/* The HW is organized in pair of channels.  See which register we need
	 * to read from */
	isr = ioread8(&channel->block_regs->r.isr);
	sr = ioread8(&channel->regs->r.sr);

	if (isr & (IMR_DELTA_BREAK_A | IMR_DELTA_BREAK_B))
		iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr);

	if ((sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
		iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
		/* In case of RS-485, change from TX to RX when finishing TX.
		 * Half-duplex. */
		if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
			iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
			iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
			channel->rx_enable = 1;
		}
	}

	/* RX data */
	if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY))
		ipoctal_irq_rx(channel, sr);

	/* TX of each character */
	if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
		ipoctal_irq_tx(channel);
}