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c66c5bda7f
Add hardware monitoring and regulator support for LT3074. The LT3074 is an ultrafast, ultralow noise 3A, 5.5V dropout linear regulator. The PMBus serial interface allows telemetry for input/output voltage, bias voltage, output current, and die temperature. Signed-off-by: Cedric Encarnacion <cedricjustine.encarnacion@analog.com> Link: https://lore.kernel.org/r/20250421-upstream-lt3074-v3-2-71636322f9fe@analog.com Signed-off-by: Guenter Roeck <linux@roeck-us.net>
122 lines
3.2 KiB
C
122 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Hardware monitoring driver for Analog Devices LT3074
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*
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* Copyright (C) 2025 Analog Devices, Inc.
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*/
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include "pmbus.h"
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#define LT3074_MFR_READ_VBIAS 0xc6
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#define LT3074_MFR_BIAS_OV_WARN_LIMIT 0xc7
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#define LT3074_MFR_BIAS_UV_WARN_LIMIT 0xc8
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#define LT3074_MFR_SPECIAL_ID 0xe7
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#define LT3074_SPECIAL_ID_VALUE 0x1c1d
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static const struct regulator_desc __maybe_unused lt3074_reg_desc[] = {
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PMBUS_REGULATOR_ONE("regulator"),
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};
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static int lt3074_read_word_data(struct i2c_client *client, int page,
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int phase, int reg)
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{
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switch (reg) {
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case PMBUS_VIRT_READ_VMON:
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return pmbus_read_word_data(client, page, phase,
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LT3074_MFR_READ_VBIAS);
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case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
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return pmbus_read_word_data(client, page, phase,
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LT3074_MFR_BIAS_UV_WARN_LIMIT);
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case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
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return pmbus_read_word_data(client, page, phase,
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LT3074_MFR_BIAS_OV_WARN_LIMIT);
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default:
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return -ENODATA;
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}
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}
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static int lt3074_write_word_data(struct i2c_client *client, int page,
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int reg, u16 word)
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{
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switch (reg) {
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case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
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return pmbus_write_word_data(client, 0,
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LT3074_MFR_BIAS_UV_WARN_LIMIT,
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word);
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case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
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return pmbus_write_word_data(client, 0,
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LT3074_MFR_BIAS_OV_WARN_LIMIT,
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word);
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default:
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return -ENODATA;
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}
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}
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static struct pmbus_driver_info lt3074_info = {
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.pages = 1,
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.format[PSC_VOLTAGE_IN] = linear,
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.format[PSC_VOLTAGE_OUT] = linear,
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.format[PSC_CURRENT_OUT] = linear,
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.format[PSC_TEMPERATURE] = linear,
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.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
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PMBUS_HAVE_TEMP | PMBUS_HAVE_VMON |
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PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
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PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
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.read_word_data = lt3074_read_word_data,
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.write_word_data = lt3074_write_word_data,
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#if IS_ENABLED(CONFIG_SENSORS_LT3074_REGULATOR)
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.num_regulators = 1,
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.reg_desc = lt3074_reg_desc,
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#endif
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};
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static int lt3074_probe(struct i2c_client *client)
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{
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int ret;
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struct device *dev = &client->dev;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_WORD_DATA))
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return -ENODEV;
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ret = i2c_smbus_read_word_data(client, LT3074_MFR_SPECIAL_ID);
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if (ret < 0)
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return dev_err_probe(dev, ret, "Failed to read ID\n");
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if (ret != LT3074_SPECIAL_ID_VALUE)
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return dev_err_probe(dev, -ENODEV, "ID mismatch\n");
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return pmbus_do_probe(client, <3074_info);
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}
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static const struct i2c_device_id lt3074_id[] = {
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{ "lt3074", 0 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, lt3074_id);
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static const struct of_device_id __maybe_unused lt3074_of_match[] = {
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{ .compatible = "adi,lt3074" },
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{}
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};
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MODULE_DEVICE_TABLE(of, lt3074_of_match);
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static struct i2c_driver lt3074_driver = {
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.driver = {
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.name = "lt3074",
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.of_match_table = of_match_ptr(lt3074_of_match),
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},
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.probe = lt3074_probe,
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.id_table = lt3074_id,
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};
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module_i2c_driver(lt3074_driver);
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MODULE_AUTHOR("Cedric Encarnacion <cedricjustine.encarnacion@analog.com>");
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MODULE_DESCRIPTION("PMBus driver for Analog Devices LT3074");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS("PMBUS");
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