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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Driver for Delta DPS920AB PSU4 *5 * Copyright (C) 2021 Delta Networks, Inc.6 * Copyright (C) 2021 Sartura Ltd.7 */8 9#include <linux/debugfs.h>10#include <linux/i2c.h>11#include <linux/module.h>12#include <linux/of.h>13#include "pmbus.h"14 15struct dps920ab_data {16 char *mfr_model;17 char *mfr_id;18};19 20static int dps920ab_read_word_data(struct i2c_client *client, int page, int phase, int reg)21{22 /*23 * This masks commands which are not supported.24 * PSU advertises that all features are supported,25 * in reality that unfortunately is not true.26 * So enable only those that the datasheet confirms.27 */28 switch (reg) {29 case PMBUS_FAN_COMMAND_1:30 case PMBUS_IOUT_OC_WARN_LIMIT:31 case PMBUS_STATUS_WORD:32 case PMBUS_READ_VIN:33 case PMBUS_READ_IIN:34 case PMBUS_READ_VOUT:35 case PMBUS_READ_IOUT:36 case PMBUS_READ_TEMPERATURE_1:37 case PMBUS_READ_TEMPERATURE_2:38 case PMBUS_READ_TEMPERATURE_3:39 case PMBUS_READ_FAN_SPEED_1:40 case PMBUS_READ_POUT:41 case PMBUS_READ_PIN:42 case PMBUS_MFR_VOUT_MIN:43 case PMBUS_MFR_VOUT_MAX:44 case PMBUS_MFR_IOUT_MAX:45 case PMBUS_MFR_POUT_MAX:46 return pmbus_read_word_data(client, page, phase, reg);47 default:48 return -ENXIO;49 }50}51 52static int dps920ab_write_word_data(struct i2c_client *client, int page, int reg,53 u16 word)54{55 /*56 * This masks commands which are not supported.57 * PSU only has one R/W register and that is58 * for the fan.59 */60 switch (reg) {61 case PMBUS_FAN_COMMAND_1:62 return pmbus_write_word_data(client, page, reg, word);63 default:64 return -EACCES;65 }66}67 68static struct pmbus_driver_info dps920ab_info = {69 .pages = 1,70 71 .format[PSC_VOLTAGE_IN] = linear,72 .format[PSC_VOLTAGE_OUT] = linear,73 .format[PSC_CURRENT_IN] = linear,74 .format[PSC_CURRENT_OUT] = linear,75 .format[PSC_POWER] = linear,76 .format[PSC_FAN] = linear,77 .format[PSC_TEMPERATURE] = linear,78 79 .func[0] =80 PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |81 PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT |82 PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |83 PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12 |84 PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |85 PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,86 .read_word_data = dps920ab_read_word_data,87 .write_word_data = dps920ab_write_word_data,88};89 90static int dps920ab_mfr_id_show(struct seq_file *s, void *data)91{92 struct dps920ab_data *priv = s->private;93 94 seq_printf(s, "%s\n", priv->mfr_id);95 96 return 0;97}98 99DEFINE_SHOW_ATTRIBUTE(dps920ab_mfr_id);100 101static int dps920ab_mfr_model_show(struct seq_file *s, void *data)102{103 struct dps920ab_data *priv = s->private;104 105 seq_printf(s, "%s\n", priv->mfr_model);106 107 return 0;108}109 110DEFINE_SHOW_ATTRIBUTE(dps920ab_mfr_model);111 112static void dps920ab_init_debugfs(struct dps920ab_data *data, struct i2c_client *client)113{114 struct dentry *debugfs_dir;115 struct dentry *root;116 117 root = pmbus_get_debugfs_dir(client);118 if (!root)119 return;120 121 debugfs_dir = debugfs_create_dir(client->name, root);122 123 debugfs_create_file("mfr_id",124 0400,125 debugfs_dir,126 data,127 &dps920ab_mfr_id_fops);128 129 debugfs_create_file("mfr_model",130 0400,131 debugfs_dir,132 data,133 &dps920ab_mfr_model_fops);134}135 136static int dps920ab_probe(struct i2c_client *client)137{138 u8 buf[I2C_SMBUS_BLOCK_MAX + 1];139 struct dps920ab_data *data;140 int ret;141 142 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);143 if (!data)144 return -ENOMEM;145 146 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);147 if (ret < 0) {148 dev_err(&client->dev, "Failed to read Manufacturer ID\n");149 return ret;150 }151 152 buf[ret] = '\0';153 if (ret != 5 || strncmp(buf, "DELTA", 5)) {154 buf[ret] = '\0';155 dev_err(&client->dev, "Unsupported Manufacturer ID '%s'\n", buf);156 return -ENODEV;157 }158 data->mfr_id = devm_kstrdup(&client->dev, buf, GFP_KERNEL);159 if (!data->mfr_id)160 return -ENOMEM;161 162 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);163 if (ret < 0) {164 dev_err(&client->dev, "Failed to read Manufacturer Model\n");165 return ret;166 }167 168 buf[ret] = '\0';169 if (ret != 11 || strncmp(buf, "DPS-920AB", 9)) {170 dev_err(&client->dev, "Unsupported Manufacturer Model '%s'\n", buf);171 return -ENODEV;172 }173 data->mfr_model = devm_kstrdup(&client->dev, buf, GFP_KERNEL);174 if (!data->mfr_model)175 return -ENOMEM;176 177 ret = pmbus_do_probe(client, &dps920ab_info);178 if (ret)179 return ret;180 181 dps920ab_init_debugfs(data, client);182 183 return 0;184}185 186static const struct of_device_id __maybe_unused dps920ab_of_match[] = {187 { .compatible = "delta,dps920ab", },188 {}189};190 191MODULE_DEVICE_TABLE(of, dps920ab_of_match);192 193static struct i2c_driver dps920ab_driver = {194 .driver = {195 .name = "dps920ab",196 .of_match_table = of_match_ptr(dps920ab_of_match),197 },198 .probe = dps920ab_probe,199};200 201module_i2c_driver(dps920ab_driver);202 203MODULE_AUTHOR("Robert Marko <robert.marko@sartura.hr>");204MODULE_DESCRIPTION("PMBus driver for Delta DPS920AB PSU");205MODULE_LICENSE("GPL");206MODULE_IMPORT_NS(PMBUS);207