static int idtcm_enable()

in ptp_clockmatrix.c [1940:1975]

• 30 lines of code
• 8 McCabe index (conditional complexity)

static int idtcm_enable(struct ptp_clock_info *ptp,
			struct ptp_clock_request *rq, int on)
{
	struct idtcm_channel *channel = container_of(ptp, struct idtcm_channel, caps);
	struct idtcm *idtcm = channel->idtcm;
	int err = -EOPNOTSUPP;

	mutex_lock(idtcm->lock);

	switch (rq->type) {
	case PTP_CLK_REQ_PEROUT:
		if (!on)
			err = idtcm_perout_enable(channel, &rq->perout, false);
		/* Only accept a 1-PPS aligned to the second. */
		else if (rq->perout.start.nsec || rq->perout.period.sec != 1 ||
			 rq->perout.period.nsec)
			err = -ERANGE;
		else
			err = idtcm_perout_enable(channel, &rq->perout, true);
		break;
	case PTP_CLK_REQ_EXTTS:
		err = idtcm_enable_extts(channel, rq->extts.index,
					 rq->extts.rsv[0], on);
		break;
	default:
		break;
	}

	mutex_unlock(idtcm->lock);

	if (err)
		dev_err(channel->idtcm->dev,
			"Failed in %s with err %d!", __func__, err);

	return err;
}