drivers/regulator/max77838-regulator.c

Source file repositories/reference/linux-study-clean/drivers/regulator/max77838-regulator.c

File Facts

System
Linux kernel
Corpus path
drivers/regulator/max77838-regulator.c
Extension
.c
Size
6065 bytes
Lines
222
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 max77838_regulator_info {
	struct regmap *regmap;
};

static const struct regmap_config max77838_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = MAX77838_REG_BUCK_VOUT,
};

static const struct regulator_ops max77838_regulator_ops = {
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.is_enabled		= regulator_is_enabled_regmap,
	.list_voltage		= regulator_list_voltage_linear,
	.map_voltage		= regulator_map_voltage_linear,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.set_active_discharge	= regulator_set_active_discharge_regmap,
};

static const struct regulator_desc max77838_regulators_desc[] = {
	MAX77838_LDO(1),
	MAX77838_LDO(2),
	MAX77838_LDO(3),
	MAX77838_LDO(4),
	MAX77838_BUCK_DESC,
};

static int max77838_read_device_id(struct regmap *regmap, struct device *dev)
{
	unsigned int device_id;
	int ret;

	ret = regmap_read(regmap, MAX77838_REG_DEVICE_ID, &device_id);
	if (!ret)
		dev_dbg(dev, "DEVICE_ID: 0x%x\n", device_id);

	return ret;
}

static int max77838_i2c_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct max77838_regulator_info *info;
	struct regulator_config config = {};
	struct regulator_dev *rdev;
	struct regmap *regmap;
	int i;

	info = devm_kzalloc(dev, sizeof(struct max77838_regulator_info),
			    GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	regmap = devm_regmap_init_i2c(client, &max77838_regmap_config);
	if (IS_ERR(regmap)) {
		dev_err(dev, "Failed to allocate regmap!\n");
		return PTR_ERR(regmap);
	}

	info->regmap = regmap;
	i2c_set_clientdata(client, info);

	config.dev = dev;
	config.regmap = regmap;
	config.driver_data = info;

	for (i = 0; i < MAX77838_MAX_REGULATORS; i++) {
		rdev = devm_regulator_register(dev,
					       &max77838_regulators_desc[i],
					       &config);
		if (IS_ERR(rdev)) {
			dev_err(dev, "Failed to register regulator!\n");
			return PTR_ERR(rdev);
		}
	}

	return max77838_read_device_id(regmap, dev);
}

static const struct of_device_id __maybe_unused max77838_of_match[] = {
	{ .compatible = "maxim,max77838" },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, max77838_of_match);

static const struct i2c_device_id max77838_id[] = {
	{ "max77838-regulator" },
	{ /* sentinel */ }

Annotation

Implementation Notes