drivers/mmc/core/pwrseq.c

Source file repositories/reference/linux-study-clean/drivers/mmc/core/pwrseq.c

File Facts

System
Linux kernel
Corpus path
drivers/mmc/core/pwrseq.c
Extension
.c
Size
2377 bytes
Lines
118
Domain
Driver Families
Bucket
drivers/mmc
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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 (device_match_of_node(p->dev, np)) {
			if (!try_module_get(p->owner))
				dev_err(host->parent,
					"increasing module refcount failed\n");
			else
				host->pwrseq = p;

			break;
		}
	}

	of_node_put(np);
	mutex_unlock(&pwrseq_list_mutex);

	if (!host->pwrseq)
		return -EPROBE_DEFER;

	dev_info(host->parent, "allocated mmc-pwrseq\n");

	return 0;
}

void mmc_pwrseq_pre_power_on(struct mmc_host *host)
{
	struct mmc_pwrseq *pwrseq = host->pwrseq;

	if (pwrseq && pwrseq->ops->pre_power_on)
		pwrseq->ops->pre_power_on(host);
}

void mmc_pwrseq_post_power_on(struct mmc_host *host)
{
	struct mmc_pwrseq *pwrseq = host->pwrseq;

	if (pwrseq && pwrseq->ops->post_power_on)
		pwrseq->ops->post_power_on(host);
}

void mmc_pwrseq_power_off(struct mmc_host *host)
{
	struct mmc_pwrseq *pwrseq = host->pwrseq;

	if (pwrseq && pwrseq->ops->power_off)
		pwrseq->ops->power_off(host);
}

void mmc_pwrseq_reset(struct mmc_host *host)
{
	struct mmc_pwrseq *pwrseq = host->pwrseq;

	if (pwrseq && pwrseq->ops->reset)
		pwrseq->ops->reset(host);
}

void mmc_pwrseq_free(struct mmc_host *host)
{
	struct mmc_pwrseq *pwrseq = host->pwrseq;

	if (pwrseq) {
		module_put(pwrseq->owner);
		host->pwrseq = NULL;
	}
}

int mmc_pwrseq_register(struct mmc_pwrseq *pwrseq)
{
	if (!pwrseq || !pwrseq->ops || !pwrseq->dev)
		return -EINVAL;

	mutex_lock(&pwrseq_list_mutex);
	list_add(&pwrseq->pwrseq_node, &pwrseq_list);
	mutex_unlock(&pwrseq_list_mutex);

	return 0;
}
EXPORT_SYMBOL_GPL(mmc_pwrseq_register);

void mmc_pwrseq_unregister(struct mmc_pwrseq *pwrseq)
{
	if (pwrseq) {
		mutex_lock(&pwrseq_list_mutex);
		list_del(&pwrseq->pwrseq_node);
		mutex_unlock(&pwrseq_list_mutex);
	}
}
EXPORT_SYMBOL_GPL(mmc_pwrseq_unregister);

Annotation

Implementation Notes