drivers/watchdog/ibmasr.c

Source file repositories/reference/linux-study-clean/drivers/watchdog/ibmasr.c

File Facts

System
Linux kernel
Corpus path
drivers/watchdog/ibmasr.c
Extension
.c
Size
9541 bytes
Lines
421
Domain
Driver Families
Bucket
drivers/watchdog
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

static const struct file_operations asr_fops = {
	.owner =		THIS_MODULE,
	.write =		asr_write,
	.unlocked_ioctl =	asr_ioctl,
	.compat_ioctl =		compat_ptr_ioctl,
	.open =			asr_open,
	.release =		asr_release,
};

static struct miscdevice asr_miscdev = {
	.minor =	WATCHDOG_MINOR,
	.name =		"watchdog",
	.fops =		&asr_fops,
};


struct ibmasr_id {
	const char *desc;
	int type;
};

static struct ibmasr_id ibmasr_id_table[] __initdata = {
	{ "IBM Automatic Server Restart - eserver xSeries 220", ASMTYPE_TOPAZ },
	{ "IBM Automatic Server Restart - Machine Type 8673", ASMTYPE_PEARL },
	{ "IBM Automatic Server Restart - Machine Type 8480", ASMTYPE_JASPER },
	{ "IBM Automatic Server Restart - Machine Type 8482", ASMTYPE_JUNIPER },
	{ "IBM Automatic Server Restart - Machine Type 8648", ASMTYPE_SPRUCE },
	{ NULL }
};

static int __init ibmasr_init(void)
{
	struct ibmasr_id *id;
	int rc;

	for (id = ibmasr_id_table; id->desc; id++) {
		if (dmi_find_device(DMI_DEV_TYPE_OTHER, id->desc, NULL)) {
			asr_type = id->type;
			break;
		}
	}

	if (!asr_type)
		return -ENODEV;

	rc = asr_get_base_address();
	if (rc)
		return rc;

	rc = misc_register(&asr_miscdev);
	if (rc < 0) {
		release_region(asr_base, asr_length);
		pr_err("failed to register misc device\n");
		return rc;
	}

	return 0;
}

static void __exit ibmasr_exit(void)
{
	if (!nowayout)
		asr_disable();

	misc_deregister(&asr_miscdev);

	release_region(asr_base, asr_length);
}

module_init(ibmasr_init);
module_exit(ibmasr_exit);

module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout,
	"Watchdog cannot be stopped once started (default="
				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

MODULE_DESCRIPTION("IBM Automatic Server Restart driver");
MODULE_AUTHOR("Andrey Panin");
MODULE_LICENSE("GPL");

Annotation

Implementation Notes