drivers/mmc/core/pwrseq_sd8787.c

Source file repositories/reference/linux-study-clean/drivers/mmc/core/pwrseq_sd8787.c

File Facts

System
Linux kernel
Corpus path
drivers/mmc/core/pwrseq_sd8787.c
Extension
.c
Size
3864 bytes
Lines
135
Domain
Driver Families
Bucket
drivers/mmc
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 mmc_pwrseq_sd8787 {
	struct mmc_pwrseq pwrseq;
	struct gpio_desc *reset_gpio;
	struct gpio_desc *pwrdn_gpio;
};

#define to_pwrseq_sd8787(p) container_of(p, struct mmc_pwrseq_sd8787, pwrseq)

static void mmc_pwrseq_sd8787_pre_power_on(struct mmc_host *host)
{
	struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);

	gpiod_set_value_cansleep(pwrseq->reset_gpio, 1);

	msleep(300);
	gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 1);
}

static void mmc_pwrseq_sd8787_power_off(struct mmc_host *host)
{
	struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);

	gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 0);
	gpiod_set_value_cansleep(pwrseq->reset_gpio, 0);
}

static void mmc_pwrseq_wilc1000_pre_power_on(struct mmc_host *host)
{
	struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);

	/* The pwrdn_gpio is really CHIP_EN, reset_gpio is RESETN */
	gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 1);
	msleep(5);
	gpiod_set_value_cansleep(pwrseq->reset_gpio, 1);
}

static void mmc_pwrseq_wilc1000_power_off(struct mmc_host *host)
{
	struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);

	gpiod_set_value_cansleep(pwrseq->reset_gpio, 0);
	gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 0);
}

static const struct mmc_pwrseq_ops mmc_pwrseq_sd8787_ops = {
	.pre_power_on = mmc_pwrseq_sd8787_pre_power_on,
	.power_off = mmc_pwrseq_sd8787_power_off,
};

static const struct mmc_pwrseq_ops mmc_pwrseq_wilc1000_ops = {
	.pre_power_on = mmc_pwrseq_wilc1000_pre_power_on,
	.power_off = mmc_pwrseq_wilc1000_power_off,
};

static const struct of_device_id mmc_pwrseq_sd8787_of_match[] = {
	{ .compatible = "mmc-pwrseq-sd8787", .data = &mmc_pwrseq_sd8787_ops },
	{ .compatible = "mmc-pwrseq-wilc1000", .data = &mmc_pwrseq_wilc1000_ops },
	{/* sentinel */},
};
MODULE_DEVICE_TABLE(of, mmc_pwrseq_sd8787_of_match);

static int mmc_pwrseq_sd8787_probe(struct platform_device *pdev)
{
	struct mmc_pwrseq_sd8787 *pwrseq;
	struct device *dev = &pdev->dev;
	const struct of_device_id *match;

	pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL);
	if (!pwrseq)
		return -ENOMEM;

	match = of_match_node(mmc_pwrseq_sd8787_of_match, pdev->dev.of_node);

	pwrseq->pwrdn_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_LOW);
	if (IS_ERR(pwrseq->pwrdn_gpio))
		return PTR_ERR(pwrseq->pwrdn_gpio);

	pwrseq->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
	if (IS_ERR(pwrseq->reset_gpio))
		return PTR_ERR(pwrseq->reset_gpio);

	pwrseq->pwrseq.dev = dev;
	pwrseq->pwrseq.ops = match->data;
	pwrseq->pwrseq.owner = THIS_MODULE;
	platform_set_drvdata(pdev, pwrseq);

	return mmc_pwrseq_register(&pwrseq->pwrseq);
}

static void mmc_pwrseq_sd8787_remove(struct platform_device *pdev)

Annotation

Implementation Notes