drivers/regulator/lp87565-regulator.c

Source file repositories/reference/linux-study-clean/drivers/regulator/lp87565-regulator.c

File Facts

System
Linux kernel
Corpus path
drivers/regulator/lp87565-regulator.c
Extension
.c
Size
7524 bytes
Lines
251
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 lp87565_regulator {
	struct regulator_desc desc;
	unsigned int ctrl2_reg;
};

static const struct lp87565_regulator regulators[];

static const struct linear_range buck0_1_2_3_ranges[] = {
	REGULATOR_LINEAR_RANGE(600000, 0xA, 0x17, 10000),
	REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
	REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
};

static const unsigned int lp87565_buck_ramp_delay[] = {
	30000, 15000, 10000, 7500, 3800, 1900, 940, 470
};

/* LP87565 BUCK current limit */
static const unsigned int lp87565_buck_uA[] = {
	1500000, 2000000, 2500000, 3000000, 3500000, 4000000, 4500000, 5000000,
};

static int lp87565_buck_set_ramp_delay(struct regulator_dev *rdev,
				       int ramp_delay)
{
	int id = rdev_get_id(rdev);
	unsigned int reg;
	int ret;

	if (ramp_delay <= 470)
		reg = 7;
	else if (ramp_delay <= 940)
		reg = 6;
	else if (ramp_delay <= 1900)
		reg = 5;
	else if (ramp_delay <= 3800)
		reg = 4;
	else if (ramp_delay <= 7500)
		reg = 3;
	else if (ramp_delay <= 10000)
		reg = 2;
	else if (ramp_delay <= 15000)
		reg = 1;
	else
		reg = 0;

	ret = regmap_update_bits(rdev->regmap, regulators[id].ctrl2_reg,
				 LP87565_BUCK_CTRL_2_SLEW_RATE,
				 FIELD_PREP(LP87565_BUCK_CTRL_2_SLEW_RATE, reg));
	if (ret) {
		dev_err(&rdev->dev, "SLEW RATE write failed: %d\n", ret);
		return ret;
	}

	rdev->constraints->ramp_delay = lp87565_buck_ramp_delay[reg];

	/* Conservatively give a 15% margin */
	rdev->constraints->ramp_delay =
				rdev->constraints->ramp_delay * 85 / 100;

	return 0;
}

/* Operations permitted on BUCKs */
static const struct regulator_ops lp87565_buck_ops = {
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear_range,
	.map_voltage		= regulator_map_voltage_linear_range,
	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
	.set_ramp_delay		= lp87565_buck_set_ramp_delay,
	.set_current_limit	= regulator_set_current_limit_regmap,
	.get_current_limit	= regulator_get_current_limit_regmap,
};

static const struct lp87565_regulator regulators[] = {
	LP87565_REGULATOR("BUCK0", LP87565_BUCK_0, "buck0", lp87565_buck_ops,
			  256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
			  LP87565_REG_BUCK0_CTRL_1,
			  LP87565_BUCK_CTRL_1_EN |
			  LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
			  LP87565_BUCK_CTRL_1_EN, 3230,
			  buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
	LP87565_REGULATOR("BUCK1", LP87565_BUCK_1, "buck1", lp87565_buck_ops,
			  256, LP87565_REG_BUCK1_VOUT, LP87565_BUCK_VSET,
			  LP87565_REG_BUCK1_CTRL_1,
			  LP87565_BUCK_CTRL_1_EN |

Annotation

Implementation Notes