static long hsc_ioctl()

in clients/hsi_char.c [525:577]

• 51 lines of code
• 17 McCabe index (conditional complexity)

static long hsc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct hsc_channel *channel = file->private_data;
	unsigned int state;
	struct hsc_rx_config rxc;
	struct hsc_tx_config txc;
	long ret = 0;

	switch (cmd) {
	case HSC_RESET:
		hsi_flush(channel->cl);
		break;
	case HSC_SET_PM:
		if (copy_from_user(&state, (void __user *)arg, sizeof(state)))
			return -EFAULT;
		if (state == HSC_PM_DISABLE) {
			if (test_and_set_bit(HSC_CH_WLINE, &channel->flags))
				return -EINVAL;
			ret = hsi_start_tx(channel->cl);
		} else if (state == HSC_PM_ENABLE) {
			if (!test_and_clear_bit(HSC_CH_WLINE, &channel->flags))
				return -EINVAL;
			ret = hsi_stop_tx(channel->cl);
		} else {
			ret = -EINVAL;
		}
		break;
	case HSC_SEND_BREAK:
		return hsc_break_send(channel->cl);
	case HSC_SET_RX:
		if (copy_from_user(&rxc, (void __user *)arg, sizeof(rxc)))
			return -EFAULT;
		return hsc_rx_set(channel->cl, &rxc);
	case HSC_GET_RX:
		hsc_rx_get(channel->cl, &rxc);
		if (copy_to_user((void __user *)arg, &rxc, sizeof(rxc)))
			return -EFAULT;
		break;
	case HSC_SET_TX:
		if (copy_from_user(&txc, (void __user *)arg, sizeof(txc)))
			return -EFAULT;
		return hsc_tx_set(channel->cl, &txc);
	case HSC_GET_TX:
		hsc_tx_get(channel->cl, &txc);
		if (copy_to_user((void __user *)arg, &txc, sizeof(txc)))
			return -EFAULT;
		break;
	default:
		return -ENOIOCTLCMD;
	}

	return ret;
}