drivers/regulator/ltc3676.c

Source file repositories/reference/linux-study-clean/drivers/regulator/ltc3676.c

File Facts

System
Linux kernel
Corpus path
drivers/regulator/ltc3676.c
Extension
.c
Size
11282 bytes
Lines
385
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 ltc3676 {
	struct regmap *regmap;
	struct device *dev;
	struct regulator_desc regulator_descs[LTC3676_NUM_REGULATORS];
	struct regulator_dev *regulators[LTC3676_NUM_REGULATORS];
};

static int ltc3676_set_suspend_voltage(struct regulator_dev *rdev, int uV)
{
	struct ltc3676 *ltc3676 = rdev_get_drvdata(rdev);
	struct device *dev = ltc3676->dev;
	int dcdc = rdev_get_id(rdev);
	int sel;

	dev_dbg(dev, "%s id=%d uV=%d\n", __func__, dcdc, uV);
	sel = regulator_map_voltage_linear(rdev, uV, uV);
	if (sel < 0)
		return sel;

	/* DVBB register follows right after the corresponding DVBA register */
	return regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg + 1,
				  rdev->desc->vsel_mask, sel);
}

static int ltc3676_set_suspend_mode(struct regulator_dev *rdev,
				    unsigned int mode)
{
	struct ltc3676 *ltc3676= rdev_get_drvdata(rdev);
	struct device *dev = ltc3676->dev;
	int mask, val;
	int dcdc = rdev_get_id(rdev);

	dev_dbg(dev, "%s id=%d mode=%d\n", __func__, dcdc, mode);

	mask = LTC3676_DVBxA_REF_SELECT;
	switch (mode) {
	case REGULATOR_MODE_STANDBY:
		val = 0; /* select DVBxA */
		break;
	case REGULATOR_MODE_NORMAL:
		val = LTC3676_DVBxA_REF_SELECT; /* select DVBxB */
		break;
	default:
		dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
			 rdev->desc->name, mode);
		return -EINVAL;
	}

	return regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg,
				  mask, val);
}

static int ltc3676_set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
{
	struct ltc3676 *ltc3676 = rdev_get_drvdata(rdev);
	struct device *dev = ltc3676->dev;
	int ret, dcdc = rdev_get_id(rdev);

	dev_dbg(dev, "%s id=%d selector=%d\n", __func__, dcdc, selector);

	ret = regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg + 1,
				 LTC3676_DVBxB_PGOOD_MASK,
				 LTC3676_DVBxB_PGOOD_MASK);
	if (ret)
		return ret;

	return regulator_set_voltage_sel_regmap(rdev, selector);
}

static inline unsigned int ltc3676_scale(unsigned int uV, u32 r1, u32 r2)
{
	uint64_t tmp;
	if (uV == 0)
		return 0;
	tmp = (uint64_t)uV * r1;
	do_div(tmp, r2);
	return uV + (unsigned int)tmp;
}

static int ltc3676_of_parse_cb(struct device_node *np,
			       const struct regulator_desc *desc,
			       struct regulator_config *config)
{
	struct ltc3676 *ltc3676 = config->driver_data;
	struct regulator_desc *rdesc = &ltc3676->regulator_descs[desc->id];
	u32 r[2];
	int ret;

	/* LDO3 has a fixed output */
	if (desc->id == LTC3676_LDO3)

Annotation

Implementation Notes