drivers/regulator/mp886x.c

Source file repositories/reference/linux-study-clean/drivers/regulator/mp886x.c

File Facts

System
Linux kernel
Corpus path
drivers/regulator/mp886x.c
Extension
.c
Size
8831 bytes
Lines
371
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 mp886x_cfg_info {
	const struct regulator_ops *rops;
	const unsigned int slew_rates[8];
	const int switch_freq[4];
	const u8 fs_reg;
	const u8 fs_shift;
};

struct mp886x_device_info {
	struct device *dev;
	struct regulator_desc desc;
	struct regulator_init_data *regulator;
	struct gpio_desc *en_gpio;
	const struct mp886x_cfg_info *ci;
	u32 r[2];
	unsigned int sel;
};

static void mp886x_set_switch_freq(struct mp886x_device_info *di,
				   struct regmap *regmap,
				   u32 freq)
{
	const struct mp886x_cfg_info *ci = di->ci;
	int i;

	for (i = 0; i < ARRAY_SIZE(ci->switch_freq); i++) {
		if (freq == ci->switch_freq[i]) {
			regmap_update_bits(regmap, ci->fs_reg,
				  0x3 << ci->fs_shift, i << ci->fs_shift);
			return;
		}
	}

	dev_err(di->dev, "invalid frequency %d\n", freq);
}

static int mp886x_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	switch (mode) {
	case REGULATOR_MODE_FAST:
		regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
				   MP886X_MODE, MP886X_MODE);
		break;
	case REGULATOR_MODE_NORMAL:
		regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
				   MP886X_MODE, 0);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static unsigned int mp886x_get_mode(struct regulator_dev *rdev)
{
	u32 val;
	int ret;

	ret = regmap_read(rdev->regmap, MP886X_SYSCNTLREG1, &val);
	if (ret < 0)
		return ret;
	if (val & MP886X_MODE)
		return REGULATOR_MODE_FAST;
	else
		return REGULATOR_MODE_NORMAL;
}

static int mp8869_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
{
	int ret;

	ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
				 MP886X_GO, MP886X_GO);
	if (ret < 0)
		return ret;

	sel <<= ffs(rdev->desc->vsel_mask) - 1;
	return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
				  MP886X_V_BOOT | rdev->desc->vsel_mask, sel);
}

static inline unsigned int mp8869_scale(unsigned int uv, u32 r1, u32 r2)
{
	u32 tmp = uv * r1 / r2;

	return uv + tmp;
}

static int mp8869_get_voltage_sel(struct regulator_dev *rdev)
{

Annotation

Implementation Notes