drivers/regulator/sy8827n.c

Source file repositories/reference/linux-study-clean/drivers/regulator/sy8827n.c

File Facts

System
Linux kernel
Corpus path
drivers/regulator/sy8827n.c
Extension
.c
Size
5133 bytes
Lines
202
Domain
Driver Families
Bucket
drivers/regulator
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 sy8827n_device_info {
	struct device *dev;
	struct regulator_desc desc;
	struct regulator_init_data *regulator;
	struct gpio_desc *en_gpio;
	unsigned int vsel_reg;
};

static int sy8827n_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	struct sy8827n_device_info *di = rdev_get_drvdata(rdev);

	switch (mode) {
	case REGULATOR_MODE_FAST:
		regmap_update_bits(rdev->regmap, di->vsel_reg,
				   SY8827N_MODE, SY8827N_MODE);
		break;
	case REGULATOR_MODE_NORMAL:
		regmap_update_bits(rdev->regmap, di->vsel_reg,
				   SY8827N_MODE, 0);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static unsigned int sy8827n_get_mode(struct regulator_dev *rdev)
{
	struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
	u32 val;
	int ret = 0;

	ret = regmap_read(rdev->regmap, di->vsel_reg, &val);
	if (ret < 0)
		return ret;
	if (val & SY8827N_MODE)
		return REGULATOR_MODE_FAST;
	else
		return REGULATOR_MODE_NORMAL;
}

static const struct regulator_ops sy8827n_regulator_ops = {
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_time_sel = regulator_set_voltage_time_sel,
	.map_voltage = regulator_map_voltage_linear,
	.list_voltage = regulator_list_voltage_linear,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.set_mode = sy8827n_set_mode,
	.get_mode = sy8827n_get_mode,
};

static int sy8827n_regulator_register(struct sy8827n_device_info *di,
			struct regulator_config *config)
{
	struct regulator_desc *rdesc = &di->desc;
	struct regulator_dev *rdev;

	rdesc->name = "sy8827n-reg";
	rdesc->supply_name = "vin";
	rdesc->ops = &sy8827n_regulator_ops;
	rdesc->type = REGULATOR_VOLTAGE;
	rdesc->n_voltages = SY8827N_NVOLTAGES;
	rdesc->enable_reg = di->vsel_reg;
	rdesc->enable_mask = SY8827N_BUCK_EN;
	rdesc->min_uV = SY8827N_VSELMIN;
	rdesc->uV_step = SY8827N_VSELSTEP;
	rdesc->vsel_reg = di->vsel_reg;
	rdesc->vsel_mask = rdesc->n_voltages - 1;
	rdesc->owner = THIS_MODULE;

	rdev = devm_regulator_register(di->dev, &di->desc, config);
	return PTR_ERR_OR_ZERO(rdev);
}

static bool sy8827n_volatile_reg(struct device *dev, unsigned int reg)
{
	if (reg == SY8827N_PGOOD)
		return true;
	return false;
}

static const struct regmap_config sy8827n_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.volatile_reg = sy8827n_volatile_reg,
	.num_reg_defaults_raw = SY8827N_MAX,

Annotation

Implementation Notes