drivers/acpi/arm64/apmt.c

Source file repositories/reference/linux-study-clean/drivers/acpi/arm64/apmt.c

File Facts

System
Linux kernel
Corpus path
drivers/acpi/arm64/apmt.c
Extension
.c
Size
3969 bytes
Lines
181
Domain
Driver Families
Bucket
drivers/acpi
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (irq <= 0) {
			pr_warn("APMT could not register gsi hwirq %d\n", irq);
			return num_res;
		}

		res[num_res].start = irq;
		res[num_res].end = irq;
		res[num_res].flags = IORESOURCE_IRQ;

		num_res++;
	}

	return num_res;
}

/**
 * apmt_add_platform_device() - Allocate a platform device for APMT node
 * @node: Pointer to device ACPI APMT node
 * @fwnode: fwnode associated with the APMT node
 *
 * Returns: 0 on success, <0 failure
 */
static int __init apmt_add_platform_device(struct acpi_apmt_node *node,
					   struct fwnode_handle *fwnode)
{
	struct platform_device *pdev;
	int ret, count;
	struct resource res[DEV_MAX_RESOURCE_COUNT];

	pdev = platform_device_alloc(DEV_NAME, PLATFORM_DEVID_AUTO);
	if (!pdev)
		return -ENOMEM;

	memset(res, 0, sizeof(res));

	count = apmt_init_resources(res, node);

	ret = platform_device_add_resources(pdev, res, count);
	if (ret)
		goto dev_put;

	/*
	 * Add a copy of APMT node pointer to platform_data to be used to
	 * retrieve APMT data information.
	 */
	ret = platform_device_add_data(pdev, &node, sizeof(node));
	if (ret)
		goto dev_put;

	pdev->dev.fwnode = fwnode;

	ret = platform_device_add(pdev);

	if (ret)
		goto dev_put;

	return 0;

dev_put:
	platform_device_put(pdev);

	return ret;
}

static int __init apmt_init_platform_devices(void)
{
	struct acpi_apmt_node *apmt_node;
	struct acpi_table_apmt *apmt;
	struct fwnode_handle *fwnode;
	u64 offset, end;
	int ret;

	/*
	 * apmt_table and apmt both point to the start of APMT table, but
	 * have different struct types
	 */
	apmt = (struct acpi_table_apmt *)apmt_table;
	offset = sizeof(*apmt);
	end = apmt->header.length;

	while (offset < end) {
		apmt_node = ACPI_ADD_PTR(struct acpi_apmt_node, apmt,
				 offset);

		fwnode = acpi_alloc_fwnode_static();
		if (!fwnode)
			return -ENOMEM;

		ret = apmt_add_platform_device(apmt_node, fwnode);
		if (ret) {

Annotation

Implementation Notes