static int intel_qep_enable_write()

in intel-qep.c [222:252]

• 26 lines of code
• 3 McCabe index (conditional complexity)

static int intel_qep_enable_write(struct counter_device *counter,
				  struct counter_count *count, u8 val)
{
	struct intel_qep *qep = counter_priv(counter);
	u32 reg;
	bool changed;

	mutex_lock(&qep->lock);
	changed = val ^ qep->enabled;
	if (!changed)
		goto out;

	pm_runtime_get_sync(qep->dev);
	reg = intel_qep_readl(qep, INTEL_QEPCON);
	if (val) {
		/* Enable peripheral and keep runtime PM always on */
		reg |= INTEL_QEPCON_EN;
		pm_runtime_get_noresume(qep->dev);
	} else {
		/* Let runtime PM be idle and disable peripheral */
		pm_runtime_put_noidle(qep->dev);
		reg &= ~INTEL_QEPCON_EN;
	}
	intel_qep_writel(qep, INTEL_QEPCON, reg);
	pm_runtime_put(qep->dev);
	qep->enabled = val;

out:
	mutex_unlock(&qep->lock);
	return 0;
}