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