/**
* acpi_irq_get - Lookup an ACPI IRQ resource and use it to initialize resource.
* @handle: ACPI device handle
* @index: ACPI IRQ resource index to lookup
* @res: Linux IRQ resource to initialize
*
* Description:
* Look for the ACPI IRQ resource with the given index and use it to initialize
* the given Linux IRQ resource.
*
* Return:
* 0 on success
* -EINVAL if an error occurs
* -EPROBE_DEFER if the IRQ lookup/conversion failed
*/
int acpi_irq_get(acpi_handle handle, unsigned int index, struct resource *res)
{
struct irq_fwspec fwspec;
struct irq_domain *domain;
unsigned long flags;
int rc;
rc = acpi_irq_parse_one(handle, index, &fwspec, &flags);
if (rc)
return rc;
domain = irq_find_matching_fwnode(fwspec.fwnode, DOMAIN_BUS_ANY);
if (!domain)
return -EPROBE_DEFER;
rc = irq_create_fwspec_mapping(&fwspec);
if (rc <= 0)
return -EINVAL;
res->start = rc;
res->end = rc;
res->flags = flags;
return 0;
}
/**
* acpi_register_gsi() - Map a GSI to a linux IRQ number
* @dev: device for which IRQ has to be mapped
* @gsi: GSI IRQ number
* @trigger: trigger type of the GSI number to be mapped
* @polarity: polarity of the GSI to be mapped
*
* Returns: a valid linux IRQ number on success
* -EINVAL on failure
*/
int acpi_register_gsi(struct device *dev, u32 gsi, int trigger,
int polarity)
{
struct irq_fwspec fwspec;
if (WARN_ON(!acpi_gsi_domain_id)) {
pr_warn("GSI: No registered irqchip, giving up\n");
return -EINVAL;
}
fwspec.fwnode = acpi_gsi_domain_id;
fwspec.param[0] = gsi;
fwspec.param[1] = acpi_dev_get_irq_type(trigger, polarity);
fwspec.param_count = 2;
return irq_create_fwspec_mapping(&fwspec);
}
static int xgene_gpio_sb_to_irq(struct gpio_chip *gc, u32 gpio)
{
struct xgene_gpio_sb *priv = gpiochip_get_data(gc);
struct irq_fwspec fwspec;
if ((gpio < priv->irq_start) ||
(gpio > HWIRQ_TO_GPIO(priv, priv->nirq)))
return -ENXIO;
if (gc->parent->of_node)
fwspec.fwnode = of_node_to_fwnode(gc->parent->of_node);
else
fwspec.fwnode = gc->parent->fwnode;
fwspec.param_count = 2;
fwspec.param[0] = GPIO_TO_HWIRQ(priv, gpio);
fwspec.param[1] = IRQ_TYPE_NONE;
return irq_create_fwspec_mapping(&fwspec);
}
