static int __init stm32_exti_init()

in irq-stm32-exti.c [753:824]

• 60 lines of code
• 6 McCabe index (conditional complexity)

static int __init stm32_exti_init(const struct stm32_exti_drv_data *drv_data,
				  struct device_node *node)
{
	struct stm32_exti_host_data *host_data;
	unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
	int nr_irqs, ret, i;
	struct irq_chip_generic *gc;
	struct irq_domain *domain;

	host_data = stm32_exti_host_init(drv_data, node);
	if (!host_data)
		return -ENOMEM;

	domain = irq_domain_add_linear(node, drv_data->bank_nr * IRQS_PER_BANK,
				       &irq_exti_domain_ops, NULL);
	if (!domain) {
		pr_err("%pOFn: Could not register interrupt domain.\n",
		       node);
		ret = -ENOMEM;
		goto out_unmap;
	}

	ret = irq_alloc_domain_generic_chips(domain, IRQS_PER_BANK, 1, "exti",
					     handle_edge_irq, clr, 0, 0);
	if (ret) {
		pr_err("%pOF: Could not allocate generic interrupt chip.\n",
		       node);
		goto out_free_domain;
	}

	for (i = 0; i < drv_data->bank_nr; i++) {
		const struct stm32_exti_bank *stm32_bank;
		struct stm32_exti_chip_data *chip_data;

		stm32_bank = drv_data->exti_banks[i];
		chip_data = stm32_exti_chip_init(host_data, i, node);

		gc = irq_get_domain_generic_chip(domain, i * IRQS_PER_BANK);

		gc->reg_base = host_data->base;
		gc->chip_types->type = IRQ_TYPE_EDGE_BOTH;
		gc->chip_types->chip.irq_ack = stm32_irq_ack;
		gc->chip_types->chip.irq_mask = irq_gc_mask_clr_bit;
		gc->chip_types->chip.irq_unmask = irq_gc_mask_set_bit;
		gc->chip_types->chip.irq_set_type = stm32_irq_set_type;
		gc->chip_types->chip.irq_set_wake = irq_gc_set_wake;
		gc->suspend = stm32_irq_suspend;
		gc->resume = stm32_irq_resume;
		gc->wake_enabled = IRQ_MSK(IRQS_PER_BANK);

		gc->chip_types->regs.mask = stm32_bank->imr_ofst;
		gc->private = (void *)chip_data;
	}

	nr_irqs = of_irq_count(node);
	for (i = 0; i < nr_irqs; i++) {
		unsigned int irq = irq_of_parse_and_map(node, i);

		irq_set_handler_data(irq, domain);
		irq_set_chained_handler(irq, stm32_irq_handler);
	}

	return 0;

out_free_domain:
	irq_domain_remove(domain);
out_unmap:
	iounmap(host_data->base);
	kfree(host_data->chips_data);
	kfree(host_data);
	return ret;
}