drivers/power/reset/syscon-reboot-mode.c

Source file repositories/reference/linux-study-clean/drivers/power/reset/syscon-reboot-mode.c

File Facts

System
Linux kernel
Corpus path
drivers/power/reset/syscon-reboot-mode.c
Extension
.c
Size
2236 bytes
Lines
87
Domain
Driver Families
Bucket
drivers/power
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

struct syscon_reboot_mode {
	struct regmap *map;
	struct reboot_mode_driver reboot;
	u32 offset;
	u32 mask;
};

static int syscon_reboot_mode_write(struct reboot_mode_driver *reboot,
				    unsigned int magic)
{
	struct syscon_reboot_mode *syscon_rbm;
	int ret;

	syscon_rbm = container_of(reboot, struct syscon_reboot_mode, reboot);

	ret = regmap_update_bits(syscon_rbm->map, syscon_rbm->offset,
				 syscon_rbm->mask, magic);
	if (ret < 0)
		dev_err(reboot->dev, "update reboot mode bits failed\n");

	return ret;
}

static int syscon_reboot_mode_probe(struct platform_device *pdev)
{
	int ret;
	struct syscon_reboot_mode *syscon_rbm;

	syscon_rbm = devm_kzalloc(&pdev->dev, sizeof(*syscon_rbm), GFP_KERNEL);
	if (!syscon_rbm)
		return -ENOMEM;

	syscon_rbm->reboot.dev = &pdev->dev;
	syscon_rbm->reboot.write = syscon_reboot_mode_write;
	syscon_rbm->mask = 0xffffffff;

	syscon_rbm->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
	if (IS_ERR(syscon_rbm->map))
		return PTR_ERR(syscon_rbm->map);

	if (of_property_read_u32(pdev->dev.of_node, "offset",
	    &syscon_rbm->offset))
		return -EINVAL;

	of_property_read_u32(pdev->dev.of_node, "mask", &syscon_rbm->mask);

	ret = devm_reboot_mode_register(&pdev->dev, &syscon_rbm->reboot);
	if (ret)
		dev_err(&pdev->dev, "can't register reboot mode\n");

	return ret;
}

static const struct of_device_id syscon_reboot_mode_of_match[] = {
	{ .compatible = "syscon-reboot-mode" },
	{}
};
MODULE_DEVICE_TABLE(of, syscon_reboot_mode_of_match);

static struct platform_driver syscon_reboot_mode_driver = {
	.probe = syscon_reboot_mode_probe,
	.driver = {
		.name = "syscon-reboot-mode",
		.of_match_table = syscon_reboot_mode_of_match,
	},
};
module_platform_driver(syscon_reboot_mode_driver);

MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com");
MODULE_DESCRIPTION("SYSCON reboot mode driver");
MODULE_LICENSE("GPL v2");

Annotation

Implementation Notes