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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Hardware monitoring driver for Analog Devices LT7182S4 *5 * Copyright (c) 2022 Guenter Roeck6 *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 "pmbus.h"17 18#define LT7182S_NUM_PAGES 219 20#define MFR_READ_EXTVCC 0xcd21#define MFR_READ_ITH 0xce22#define MFR_CONFIG_ALL_LT7182S 0xd123#define MFR_IOUT_PEAK 0xd724#define MFR_ADC_CONTROL_LT7182S 0xd825 26#define MFR_DEBUG_TELEMETRY BIT(0)27 28#define MFR_VOUT_PEAK 0xdd29#define MFR_VIN_PEAK 0xde30#define MFR_TEMPERATURE_1_PEAK 0xdf31#define MFR_CLEAR_PEAKS 0xe332 33#define MFR_CONFIG_IEEE BIT(8)34 35static int lt7182s_read_word_data(struct i2c_client *client, int page, int phase, int reg)36{37 int ret;38 39 switch (reg) {40 case PMBUS_VIRT_READ_VMON:41 if (page == 0 || page == 1)42 ret = pmbus_read_word_data(client, page, phase, MFR_READ_ITH);43 else44 ret = pmbus_read_word_data(client, 0, phase, MFR_READ_EXTVCC);45 break;46 case PMBUS_VIRT_READ_IOUT_MAX:47 ret = pmbus_read_word_data(client, page, phase, MFR_IOUT_PEAK);48 break;49 case PMBUS_VIRT_READ_VOUT_MAX:50 ret = pmbus_read_word_data(client, page, phase, MFR_VOUT_PEAK);51 break;52 case PMBUS_VIRT_READ_VIN_MAX:53 ret = pmbus_read_word_data(client, page, phase, MFR_VIN_PEAK);54 break;55 case PMBUS_VIRT_READ_TEMP_MAX:56 ret = pmbus_read_word_data(client, page, phase, MFR_TEMPERATURE_1_PEAK);57 break;58 case PMBUS_VIRT_RESET_VIN_HISTORY:59 ret = (page == 0) ? 0 : -ENODATA;60 break;61 default:62 ret = -ENODATA;63 break;64 }65 return ret;66}67 68static int lt7182s_write_word_data(struct i2c_client *client, int page, int reg, u16 word)69{70 int ret;71 72 switch (reg) {73 case PMBUS_VIRT_RESET_VIN_HISTORY:74 ret = pmbus_write_byte(client, 0, MFR_CLEAR_PEAKS);75 break;76 default:77 ret = -ENODATA;78 break;79 }80 return ret;81}82 83static struct pmbus_driver_info lt7182s_info = {84 .pages = LT7182S_NUM_PAGES,85 .format[PSC_VOLTAGE_IN] = linear,86 .format[PSC_VOLTAGE_OUT] = linear,87 .format[PSC_CURRENT_IN] = linear,88 .format[PSC_CURRENT_OUT] = linear,89 .format[PSC_TEMPERATURE] = linear,90 .format[PSC_POWER] = linear,91 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT |92 PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT |93 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |94 PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,95 .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT |96 PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT |97 PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |98 PMBUS_HAVE_STATUS_INPUT,99 .read_word_data = lt7182s_read_word_data,100 .write_word_data = lt7182s_write_word_data,101};102 103static int lt7182s_probe(struct i2c_client *client)104{105 struct device *dev = &client->dev;106 struct pmbus_driver_info *info;107 u8 buf[I2C_SMBUS_BLOCK_MAX + 1];108 int ret;109 110 if (!i2c_check_functionality(client->adapter,111 I2C_FUNC_SMBUS_READ_BYTE_DATA |112 I2C_FUNC_SMBUS_READ_WORD_DATA |113 I2C_FUNC_SMBUS_READ_BLOCK_DATA))114 return -ENODEV;115 116 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);117 if (ret < 0) {118 dev_err(dev, "Failed to read PMBUS_MFR_ID\n");119 return ret;120 }121 if (ret != 3 || strncmp(buf, "ADI", 3)) {122 buf[ret] = '\0';123 dev_err(dev, "Manufacturer '%s' not supported\n", buf);124 return -ENODEV;125 }126 127 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);128 if (ret < 0) {129 dev_err(dev, "Failed to read PMBUS_MFR_MODEL\n");130 return ret;131 }132 if (ret != 7 || strncmp(buf, "LT7182S", 7)) {133 buf[ret] = '\0';134 dev_err(dev, "Model '%s' not supported\n", buf);135 return -ENODEV;136 }137 138 info = devm_kmemdup(dev, <7182s_info,139 sizeof(struct pmbus_driver_info), GFP_KERNEL);140 if (!info)141 return -ENOMEM;142 143 /* Set data format to IEEE754 if configured */144 ret = i2c_smbus_read_word_data(client, MFR_CONFIG_ALL_LT7182S);145 if (ret < 0)146 return ret;147 if (ret & MFR_CONFIG_IEEE) {148 info->format[PSC_VOLTAGE_IN] = ieee754;149 info->format[PSC_VOLTAGE_OUT] = ieee754;150 info->format[PSC_CURRENT_IN] = ieee754;151 info->format[PSC_CURRENT_OUT] = ieee754;152 info->format[PSC_TEMPERATURE] = ieee754;153 info->format[PSC_POWER] = ieee754;154 }155 156 /* Enable VMON output if configured */157 ret = i2c_smbus_read_byte_data(client, MFR_ADC_CONTROL_LT7182S);158 if (ret < 0)159 return ret;160 if (ret & MFR_DEBUG_TELEMETRY) {161 info->pages = 3;162 info->func[0] |= PMBUS_HAVE_VMON;163 info->func[1] |= PMBUS_HAVE_VMON;164 info->func[2] = PMBUS_HAVE_VMON;165 }166 167 return pmbus_do_probe(client, info);168}169 170static const struct i2c_device_id lt7182s_id[] = {171 { "lt7182s" },172 {}173};174MODULE_DEVICE_TABLE(i2c, lt7182s_id);175 176static const struct of_device_id __maybe_unused lt7182s_of_match[] = {177 { .compatible = "adi,lt7182s" },178 {}179};180 181static struct i2c_driver lt7182s_driver = {182 .driver = {183 .name = "lt7182s",184 .of_match_table = of_match_ptr(lt7182s_of_match),185 },186 .probe = lt7182s_probe,187 .id_table = lt7182s_id,188};189 190module_i2c_driver(lt7182s_driver);191 192MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");193MODULE_DESCRIPTION("PMBus driver for Analog Devices LT7182S");194MODULE_LICENSE("GPL");195MODULE_IMPORT_NS(PMBUS);196