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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Hardware monitoring driver for IR352214 *5 * Copyright (C) IBM Corporation 2017.6 */7 8#include <linux/err.h>9#include <linux/i2c.h>10#include <linux/init.h>11#include <linux/kernel.h>12#include <linux/module.h>13#include "pmbus.h"14 15#define IR35221_MFR_VIN_PEAK 0xc516#define IR35221_MFR_VOUT_PEAK 0xc617#define IR35221_MFR_IOUT_PEAK 0xc718#define IR35221_MFR_TEMP_PEAK 0xc819#define IR35221_MFR_VIN_VALLEY 0xc920#define IR35221_MFR_VOUT_VALLEY 0xca21#define IR35221_MFR_IOUT_VALLEY 0xcb22#define IR35221_MFR_TEMP_VALLEY 0xcc23 24static int ir35221_read_word_data(struct i2c_client *client, int page,25 int phase, int reg)26{27 int ret;28 29 switch (reg) {30 case PMBUS_VIRT_READ_VIN_MAX:31 ret = pmbus_read_word_data(client, page, phase,32 IR35221_MFR_VIN_PEAK);33 break;34 case PMBUS_VIRT_READ_VOUT_MAX:35 ret = pmbus_read_word_data(client, page, phase,36 IR35221_MFR_VOUT_PEAK);37 break;38 case PMBUS_VIRT_READ_IOUT_MAX:39 ret = pmbus_read_word_data(client, page, phase,40 IR35221_MFR_IOUT_PEAK);41 break;42 case PMBUS_VIRT_READ_TEMP_MAX:43 ret = pmbus_read_word_data(client, page, phase,44 IR35221_MFR_TEMP_PEAK);45 break;46 case PMBUS_VIRT_READ_VIN_MIN:47 ret = pmbus_read_word_data(client, page, phase,48 IR35221_MFR_VIN_VALLEY);49 break;50 case PMBUS_VIRT_READ_VOUT_MIN:51 ret = pmbus_read_word_data(client, page, phase,52 IR35221_MFR_VOUT_VALLEY);53 break;54 case PMBUS_VIRT_READ_IOUT_MIN:55 ret = pmbus_read_word_data(client, page, phase,56 IR35221_MFR_IOUT_VALLEY);57 break;58 case PMBUS_VIRT_READ_TEMP_MIN:59 ret = pmbus_read_word_data(client, page, phase,60 IR35221_MFR_TEMP_VALLEY);61 break;62 default:63 ret = -ENODATA;64 break;65 }66 67 return ret;68}69 70static int ir35221_probe(struct i2c_client *client)71{72 struct pmbus_driver_info *info;73 u8 buf[I2C_SMBUS_BLOCK_MAX];74 int ret;75 76 if (!i2c_check_functionality(client->adapter,77 I2C_FUNC_SMBUS_READ_BYTE_DATA78 | I2C_FUNC_SMBUS_READ_WORD_DATA79 | I2C_FUNC_SMBUS_READ_BLOCK_DATA))80 return -ENODEV;81 82 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);83 if (ret < 0) {84 dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");85 return ret;86 }87 if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) {88 dev_err(&client->dev, "MFR_ID unrecognised\n");89 return -ENODEV;90 }91 92 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);93 if (ret < 0) {94 dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");95 return ret;96 }97 if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) {98 dev_err(&client->dev, "MFR_MODEL unrecognised\n");99 return -ENODEV;100 }101 102 info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),103 GFP_KERNEL);104 if (!info)105 return -ENOMEM;106 107 info->read_word_data = ir35221_read_word_data;108 109 info->pages = 2;110 info->format[PSC_VOLTAGE_IN] = linear;111 info->format[PSC_VOLTAGE_OUT] = linear;112 info->format[PSC_CURRENT_IN] = linear;113 info->format[PSC_CURRENT_OUT] = linear;114 info->format[PSC_POWER] = linear;115 info->format[PSC_TEMPERATURE] = linear;116 117 info->func[0] = PMBUS_HAVE_VIN118 | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN119 | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN120 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP121 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT122 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP;123 info->func[1] = info->func[0];124 125 return pmbus_do_probe(client, info);126}127 128static const struct i2c_device_id ir35221_id[] = {129 {"ir35221"},130 {}131};132 133MODULE_DEVICE_TABLE(i2c, ir35221_id);134 135static struct i2c_driver ir35221_driver = {136 .driver = {137 .name = "ir35221",138 },139 .probe = ir35221_probe,140 .id_table = ir35221_id,141};142 143module_i2c_driver(ir35221_driver);144 145MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com");146MODULE_DESCRIPTION("PMBus driver for IR35221");147MODULE_LICENSE("GPL");148MODULE_IMPORT_NS(PMBUS);149