drivers/infiniband/hw/hfi1/device.c

Source file repositories/reference/linux-study-clean/drivers/infiniband/hw/hfi1/device.c

File Facts

System
Linux kernel
Corpus path
drivers/infiniband/hw/hfi1/device.c
Extension
.c
Size
2734 bytes
Lines
133
Domain
Driver Families
Bucket
drivers/infiniband
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern 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

const struct file_operations *fops,
		   struct cdev *cdev, struct device **devp,
		   bool user_accessible,
		   struct kobject *parent)
{
	const dev_t dev = MKDEV(MAJOR(hfi1_dev), minor);
	struct device *device = NULL;
	int ret;

	cdev_init(cdev, fops);
	cdev->owner = THIS_MODULE;
	cdev_set_parent(cdev, parent);
	kobject_set_name(&cdev->kobj, name);

	ret = cdev_add(cdev, dev, 1);
	if (ret < 0) {
		pr_err("Could not add cdev for minor %d, %s (err %d)\n",
		       minor, name, -ret);
		goto done;
	}

	if (user_accessible)
		device = device_create(&user_class, NULL, dev, NULL, "%s", name);
	else
		device = device_create(&class, NULL, dev, NULL, "%s", name);

	if (IS_ERR(device)) {
		ret = PTR_ERR(device);
		pr_err("Could not create device for minor %d, %s (err %pe)\n",
		       minor, name, device);
		device = NULL;
		cdev_del(cdev);
	}
done:
	*devp = device;
	return ret;
}

void hfi1_cdev_cleanup(struct cdev *cdev, struct device **devp)
{
	struct device *device = *devp;

	if (device) {
		device_unregister(device);
		*devp = NULL;

		cdev_del(cdev);
	}
}

static const char *hfi1_class_name = "hfi1";

const char *class_name(void)
{
	return hfi1_class_name;
}

int __init dev_init(void)
{
	int ret;

	ret = alloc_chrdev_region(&hfi1_dev, 0, HFI1_NMINORS, DRIVER_NAME);
	if (ret < 0) {
		pr_err("Could not allocate chrdev region (err %d)\n", -ret);
		goto done;
	}

	ret = class_register(&class);
	if (ret) {
		pr_err("Could not create device class (err %d)\n", -ret);
		unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
		goto done;
	}

	ret = class_register(&user_class);
	if (ret) {
		pr_err("Could not create device class for user accessible files (err %d)\n",
		       -ret);
		class_unregister(&class);
		unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
		goto done;
	}

done:
	return ret;
}

void dev_cleanup(void)
{
	class_unregister(&class);

Annotation

Implementation Notes