drivers/regulator/max20411-regulator.c

Source file repositories/reference/linux-study-clean/drivers/regulator/max20411-regulator.c

File Facts

System
Linux kernel
Corpus path
drivers/regulator/max20411-regulator.c
Extension
.c
Size
4444 bytes
Lines
166
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 max20411 {
	struct device *dev;
	struct device_node *of_node;
	struct regulator_desc desc;
	struct regulator_dev *rdev;
	struct regmap *regmap;
};

static const unsigned int max20411_slew_rates[] = { 13100, 6600, 3300, 1600 };

static int max20411_enable_time(struct regulator_dev *rdev)
{
	int voltage, rate, ret;
	unsigned int val;

	/* get voltage */
	ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
	if (ret)
		return ret;

	val &= rdev->desc->vsel_mask;
	voltage = regulator_list_voltage_linear(rdev, val);

	/* get rate */
	ret = regmap_read(rdev->regmap, MAX20411_SLEW_OFFSET, &val);
	if (ret)
		return ret;

	val = FIELD_GET(MAX20411_SLEW_SR_MASK, val);
	rate = max20411_slew_rates[val];

	return DIV_ROUND_UP(voltage, rate);
}

static const struct regmap_config max20411_regmap_config = {
	.reg_bits		= 8,
	.val_bits		= 8,
	.max_register		= 0xe,
};

static const struct regulator_ops max20411_ops = {
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear,
	.enable_time		= max20411_enable_time,
};

static const struct regulator_desc max20411_desc = {
	.ops = &max20411_ops,
	.owner = THIS_MODULE,
	.type = REGULATOR_VOLTAGE,
	.supply_name = "vin",
	.name = "max20411",

	/*
	 * voltage = 0.24375V + selector * 6.25mV
	 * with valid selector between 41 to 165 (0.5V to 1.275V)
	 */
	.min_uV = MAX20411_BASE_UV,
	.uV_step = MAX20411_UV_STEP,
	.linear_min_sel = MAX20411_MIN_SEL,
	.n_voltages = MAX20411_MAX_SEL + 1,

	.vsel_reg = MAX20411_VID_OFFSET,
	.vsel_mask = MAX20411_VID_MASK,

	.ramp_reg = MAX20411_SLEW_OFFSET,
	.ramp_mask = MAX20411_SLEW_DVS_MASK,
	.ramp_delay_table = max20411_slew_rates,
	.n_ramp_values = ARRAY_SIZE(max20411_slew_rates),
};

static int max20411_probe(struct i2c_client *client)
{
	struct regulator_init_data *init_data;
	struct device *dev = &client->dev;
	struct regulator_config cfg = {};
	struct max20411 *max20411;

	max20411 = devm_kzalloc(dev, sizeof(*max20411), GFP_KERNEL);
	if (!max20411)
		return -ENOMEM;

	max20411->regmap = devm_regmap_init_i2c(client, &max20411_regmap_config);
	if (IS_ERR(max20411->regmap)) {
		dev_err(dev, "Failed to allocate regmap!\n");
		return PTR_ERR(max20411->regmap);
	}

	max20411->dev = dev;

Annotation

Implementation Notes