157 lines
4.1 KiB
C
157 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* mpq7932.c - hwmon with optional regulator driver for mps mpq7932
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* Copyright 2022 Monolithic Power Systems, Inc
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*
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* Author: Saravanan Sekar <saravanan@linumiz.com>
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*/
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#include <linux/bits.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/pmbus.h>
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#include "pmbus.h"
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#define MPQ7932_BUCK_UV_MIN 206250
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#define MPQ7932_UV_STEP 6250
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#define MPQ7932_N_VOLTAGES 256
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#define MPQ7932_VOUT_MAX 0xFF
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#define MPQ7932_NUM_PAGES 6
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#define MPQ7932_TON_DELAY 0x60
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#define MPQ7932_VOUT_STARTUP_SLEW 0xA3
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#define MPQ7932_VOUT_SHUTDOWN_SLEW 0xA5
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#define MPQ7932_VOUT_SLEW_MASK GENMASK(1, 0)
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#define MPQ7932_TON_DELAY_MASK GENMASK(4, 0)
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struct mpq7932_data {
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struct pmbus_driver_info info;
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struct pmbus_platform_data pdata;
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};
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#if IS_ENABLED(CONFIG_SENSORS_MPQ7932_REGULATOR)
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static struct regulator_desc mpq7932_regulators_desc[] = {
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PMBUS_REGULATOR_STEP("buck", 0, MPQ7932_N_VOLTAGES,
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MPQ7932_UV_STEP, MPQ7932_BUCK_UV_MIN),
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PMBUS_REGULATOR_STEP("buck", 1, MPQ7932_N_VOLTAGES,
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MPQ7932_UV_STEP, MPQ7932_BUCK_UV_MIN),
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PMBUS_REGULATOR_STEP("buck", 2, MPQ7932_N_VOLTAGES,
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MPQ7932_UV_STEP, MPQ7932_BUCK_UV_MIN),
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PMBUS_REGULATOR_STEP("buck", 3, MPQ7932_N_VOLTAGES,
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MPQ7932_UV_STEP, MPQ7932_BUCK_UV_MIN),
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PMBUS_REGULATOR_STEP("buck", 4, MPQ7932_N_VOLTAGES,
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MPQ7932_UV_STEP, MPQ7932_BUCK_UV_MIN),
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PMBUS_REGULATOR_STEP("buck", 5, MPQ7932_N_VOLTAGES,
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MPQ7932_UV_STEP, MPQ7932_BUCK_UV_MIN),
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};
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#endif
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static int mpq7932_write_word_data(struct i2c_client *client, int page, int reg,
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u16 word)
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{
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switch (reg) {
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/*
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* chip supports only byte access for VOUT_COMMAND otherwise
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* access results -EREMOTEIO
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*/
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case PMBUS_VOUT_COMMAND:
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return pmbus_write_byte_data(client, page, reg, word & 0xFF);
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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 mpq7932_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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/*
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* chip supports neither (PMBUS_VOUT_MARGIN_HIGH, PMBUS_VOUT_MARGIN_LOW)
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* nor (PMBUS_MFR_VOUT_MIN, PMBUS_MFR_VOUT_MAX). As a result set voltage
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* fails due to error in pmbus_regulator_get_low_margin, so faked.
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*/
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case PMBUS_MFR_VOUT_MIN:
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return 0;
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case PMBUS_MFR_VOUT_MAX:
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return MPQ7932_VOUT_MAX;
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/*
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* chip supports only byte access for VOUT_COMMAND otherwise
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* access results in -EREMOTEIO
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*/
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case PMBUS_READ_VOUT:
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return pmbus_read_byte_data(client, page, PMBUS_VOUT_COMMAND);
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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 mpq7932_probe(struct i2c_client *client)
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{
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struct mpq7932_data *data;
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struct pmbus_driver_info *info;
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struct device *dev = &client->dev;
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int i;
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data = devm_kzalloc(dev, sizeof(struct mpq7932_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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info = &data->info;
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info->pages = MPQ7932_NUM_PAGES;
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info->format[PSC_VOLTAGE_OUT] = direct;
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info->m[PSC_VOLTAGE_OUT] = 160;
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info->b[PSC_VOLTAGE_OUT] = -33;
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for (i = 0; i < info->pages; i++) {
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info->func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
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| PMBUS_HAVE_STATUS_TEMP;
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}
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#if IS_ENABLED(CONFIG_SENSORS_MPQ7932_REGULATOR)
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info->num_regulators = ARRAY_SIZE(mpq7932_regulators_desc);
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info->reg_desc = mpq7932_regulators_desc;
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#endif
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info->read_word_data = mpq7932_read_word_data;
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info->write_word_data = mpq7932_write_word_data;
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data->pdata.flags = PMBUS_NO_CAPABILITY;
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dev->platform_data = &data->pdata;
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return pmbus_do_probe(client, info);
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}
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static const struct of_device_id mpq7932_of_match[] = {
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{ .compatible = "mps,mpq7932"},
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{},
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};
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MODULE_DEVICE_TABLE(of, mpq7932_of_match);
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static const struct i2c_device_id mpq7932_id[] = {
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{ "mpq7932", },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, mpq7932_id);
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static struct i2c_driver mpq7932_regulator_driver = {
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.driver = {
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.name = "mpq7932",
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.of_match_table = mpq7932_of_match,
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},
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.probe = mpq7932_probe,
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.id_table = mpq7932_id,
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};
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module_i2c_driver(mpq7932_regulator_driver);
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MODULE_AUTHOR("Saravanan Sekar <saravanan@linumiz.com>");
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MODULE_DESCRIPTION("MPQ7932 PMIC regulator driver");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS(PMBUS);
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