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1// SPDX-License-Identifier: GPL-2.0+2/*3 * mpq7932.c - hwmon with optional regulator driver for mps mpq79324 * Copyright 2022 Monolithic Power Systems, Inc5 *6 * Author: Saravanan Sekar <saravanan@linumiz.com>7 */8 9#include <linux/bits.h>10#include <linux/err.h>11#include <linux/i2c.h>12#include <linux/init.h>13#include <linux/kernel.h>14#include <linux/module.h>15#include <linux/of.h>16#include <linux/pmbus.h>17#include "pmbus.h"18 19#define MPQ7932_BUCK_UV_MIN 20625020#define MPQ7932_UV_STEP 625021#define MPQ7932_N_VOLTAGES 25622#define MPQ7932_VOUT_MAX 0xFF23#define MPQ7932_NUM_PAGES 624#define MPQ2286_NUM_PAGES 125 26#define MPQ7932_TON_DELAY 0x6027#define MPQ7932_VOUT_STARTUP_SLEW 0xA328#define MPQ7932_VOUT_SHUTDOWN_SLEW 0xA529#define MPQ7932_VOUT_SLEW_MASK GENMASK(1, 0)30#define MPQ7932_TON_DELAY_MASK GENMASK(4, 0)31 32struct mpq7932_data {33 struct pmbus_driver_info info;34 struct pmbus_platform_data pdata;35};36 37#if IS_ENABLED(CONFIG_SENSORS_MPQ7932_REGULATOR)38static const struct regulator_desc mpq7932_regulators_desc[] = {39 PMBUS_REGULATOR_STEP("buck", 0, MPQ7932_N_VOLTAGES,40 MPQ7932_UV_STEP, MPQ7932_BUCK_UV_MIN),41 PMBUS_REGULATOR_STEP("buck", 1, MPQ7932_N_VOLTAGES,42 MPQ7932_UV_STEP, MPQ7932_BUCK_UV_MIN),43 PMBUS_REGULATOR_STEP("buck", 2, MPQ7932_N_VOLTAGES,44 MPQ7932_UV_STEP, MPQ7932_BUCK_UV_MIN),45 PMBUS_REGULATOR_STEP("buck", 3, MPQ7932_N_VOLTAGES,46 MPQ7932_UV_STEP, MPQ7932_BUCK_UV_MIN),47 PMBUS_REGULATOR_STEP("buck", 4, MPQ7932_N_VOLTAGES,48 MPQ7932_UV_STEP, MPQ7932_BUCK_UV_MIN),49 PMBUS_REGULATOR_STEP("buck", 5, MPQ7932_N_VOLTAGES,50 MPQ7932_UV_STEP, MPQ7932_BUCK_UV_MIN),51};52 53static const struct regulator_desc mpq7932_regulators_desc_one[] = {54 PMBUS_REGULATOR_STEP_ONE("buck", MPQ7932_N_VOLTAGES,55 MPQ7932_UV_STEP, MPQ7932_BUCK_UV_MIN),56};57#endif58 59static int mpq7932_write_word_data(struct i2c_client *client, int page, int reg,60 u16 word)61{62 switch (reg) {63 /*64 * chip supports only byte access for VOUT_COMMAND otherwise65 * access results -EREMOTEIO66 */67 case PMBUS_VOUT_COMMAND:68 return pmbus_write_byte_data(client, page, reg, word & 0xFF);69 70 default:71 return -ENODATA;72 }73}74 75static int mpq7932_read_word_data(struct i2c_client *client, int page,76 int phase, int reg)77{78 switch (reg) {79 /*80 * chip supports neither (PMBUS_VOUT_MARGIN_HIGH, PMBUS_VOUT_MARGIN_LOW)81 * nor (PMBUS_MFR_VOUT_MIN, PMBUS_MFR_VOUT_MAX). As a result set voltage82 * fails due to error in pmbus_regulator_get_low_margin, so faked.83 */84 case PMBUS_MFR_VOUT_MIN:85 return 0;86 87 case PMBUS_MFR_VOUT_MAX:88 return MPQ7932_VOUT_MAX;89 90 /*91 * chip supports only byte access for VOUT_COMMAND otherwise92 * access results in -EREMOTEIO93 */94 case PMBUS_READ_VOUT:95 return pmbus_read_byte_data(client, page, PMBUS_VOUT_COMMAND);96 97 default:98 return -ENODATA;99 }100}101 102static int mpq7932_probe(struct i2c_client *client)103{104 struct mpq7932_data *data;105 struct pmbus_driver_info *info;106 struct device *dev = &client->dev;107 int i;108 109 data = devm_kzalloc(dev, sizeof(struct mpq7932_data), GFP_KERNEL);110 if (!data)111 return -ENOMEM;112 113 info = &data->info;114 info->pages = (int)(unsigned long)device_get_match_data(&client->dev);115 info->format[PSC_VOLTAGE_OUT] = direct;116 info->m[PSC_VOLTAGE_OUT] = 160;117 info->b[PSC_VOLTAGE_OUT] = -33;118 for (i = 0; i < info->pages; i++) {119 info->func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT120 | PMBUS_HAVE_STATUS_TEMP;121 }122 123#if IS_ENABLED(CONFIG_SENSORS_MPQ7932_REGULATOR)124 info->num_regulators = info->pages;125 if (info->num_regulators == 1)126 info->reg_desc = mpq7932_regulators_desc_one;127 else128 info->reg_desc = mpq7932_regulators_desc;129#endif130 131 info->read_word_data = mpq7932_read_word_data;132 info->write_word_data = mpq7932_write_word_data;133 134 data->pdata.flags = PMBUS_NO_CAPABILITY;135 dev->platform_data = &data->pdata;136 137 return pmbus_do_probe(client, info);138}139 140static const struct of_device_id mpq7932_of_match[] = {141 { .compatible = "mps,mpq2286", .data = (void *)MPQ2286_NUM_PAGES },142 { .compatible = "mps,mpq7932", .data = (void *)MPQ7932_NUM_PAGES },143 {},144};145MODULE_DEVICE_TABLE(of, mpq7932_of_match);146 147static const struct i2c_device_id mpq7932_id[] = {148 { "mpq2286", },149 { "mpq7932", },150 { },151};152MODULE_DEVICE_TABLE(i2c, mpq7932_id);153 154static struct i2c_driver mpq7932_regulator_driver = {155 .driver = {156 .name = "mpq7932",157 .of_match_table = mpq7932_of_match,158 },159 .probe = mpq7932_probe,160 .id_table = mpq7932_id,161};162module_i2c_driver(mpq7932_regulator_driver);163 164MODULE_AUTHOR("Saravanan Sekar <saravanan@linumiz.com>");165MODULE_DESCRIPTION("MPQ7932 PMIC regulator driver");166MODULE_LICENSE("GPL");167MODULE_IMPORT_NS(PMBUS);168