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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for Delta DPS920AB PSU
*
* Copyright (C) 2021 Delta Networks, Inc.
* Copyright (C) 2021 Sartura Ltd.
*/
#include <linux/debugfs.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of.h>
#include "pmbus.h"
struct dps920ab_data {
char *mfr_model;
char *mfr_id;
};
static int dps920ab_read_word_data(struct i2c_client *client, int page, int phase, int reg)
{
/*
* This masks commands which are not supported.
* PSU advertises that all features are supported,
* in reality that unfortunately is not true.
* So enable only those that the datasheet confirms.
*/
switch (reg) {
case PMBUS_FAN_COMMAND_1:
case PMBUS_IOUT_OC_WARN_LIMIT:
case PMBUS_STATUS_WORD:
case PMBUS_READ_VIN:
case PMBUS_READ_IIN:
case PMBUS_READ_VOUT:
case PMBUS_READ_IOUT:
case PMBUS_READ_TEMPERATURE_1:
case PMBUS_READ_TEMPERATURE_2:
case PMBUS_READ_TEMPERATURE_3:
case PMBUS_READ_FAN_SPEED_1:
case PMBUS_READ_POUT:
case PMBUS_READ_PIN:
case PMBUS_MFR_VOUT_MIN:
case PMBUS_MFR_VOUT_MAX:
case PMBUS_MFR_IOUT_MAX:
case PMBUS_MFR_POUT_MAX:
return pmbus_read_word_data(client, page, phase, reg);
default:
return -ENXIO;
}
}
static int dps920ab_write_word_data(struct i2c_client *client, int page, int reg,
u16 word)
{
/*
* This masks commands which are not supported.
* PSU only has one R/W register and that is
* for the fan.
*/
switch (reg) {
case PMBUS_FAN_COMMAND_1:
return pmbus_write_word_data(client, page, reg, word);
default:
return -EACCES;
}
}
static struct pmbus_driver_info dps920ab_info = {
.pages = 1,
.format[PSC_VOLTAGE_IN] = linear,
.format[PSC_VOLTAGE_OUT] = linear,
.format[PSC_CURRENT_IN] = linear,
.format[PSC_CURRENT_OUT] = linear,
.format[PSC_POWER] = linear,
.format[PSC_FAN] = linear,
.format[PSC_TEMPERATURE] = linear,
.func[0] =
PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT |
PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12 |
PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
.read_word_data = dps920ab_read_word_data,
.write_word_data = dps920ab_write_word_data,
};
static int dps920ab_mfr_id_show(struct seq_file *s, void *data)
{
struct dps920ab_data *priv = s->private;
seq_printf(s, "%s\n", priv->mfr_id);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(dps920ab_mfr_id);
static int dps920ab_mfr_model_show(struct seq_file *s, void *data)
{
struct dps920ab_data *priv = s->private;
seq_printf(s, "%s\n", priv->mfr_model);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(dps920ab_mfr_model);
static void dps920ab_init_debugfs(struct dps920ab_data *data, struct i2c_client *client)
{
struct dentry *debugfs_dir;
struct dentry *root;
root = pmbus_get_debugfs_dir(client);
if (!root)
return;
debugfs_dir = debugfs_create_dir(client->name, root);
debugfs_create_file("mfr_id",
0400,
debugfs_dir,
data,
&dps920ab_mfr_id_fops);
debugfs_create_file("mfr_model",
0400,
debugfs_dir,
data,
&dps920ab_mfr_model_fops);
}
static int dps920ab_probe(struct i2c_client *client)
{
u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
struct dps920ab_data *data;
int ret;
data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
if (ret < 0) {
dev_err(&client->dev, "Failed to read Manufacturer ID\n");
return ret;
}
buf[ret] = '\0';
if (ret != 5 || strncmp(buf, "DELTA", 5)) {
buf[ret] = '\0';
dev_err(&client->dev, "Unsupported Manufacturer ID '%s'\n", buf);
return -ENODEV;
}
data->mfr_id = devm_kstrdup(&client->dev, buf, GFP_KERNEL);
if (!data->mfr_id)
return -ENOMEM;
ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
if (ret < 0) {
dev_err(&client->dev, "Failed to read Manufacturer Model\n");
return ret;
}
buf[ret] = '\0';
if (ret != 11 || strncmp(buf, "DPS-920AB", 9)) {
dev_err(&client->dev, "Unsupported Manufacturer Model '%s'\n", buf);
return -ENODEV;
}
data->mfr_model = devm_kstrdup(&client->dev, buf, GFP_KERNEL);
if (!data->mfr_model)
return -ENOMEM;
ret = pmbus_do_probe(client, &dps920ab_info);
if (ret)
return ret;
dps920ab_init_debugfs(data, client);
return 0;
}
static const struct of_device_id __maybe_unused dps920ab_of_match[] = {
{ .compatible = "delta,dps920ab", },
{}
};
MODULE_DEVICE_TABLE(of, dps920ab_of_match);
static struct i2c_driver dps920ab_driver = {
.driver = {
.name = "dps920ab",
.of_match_table = of_match_ptr(dps920ab_of_match),
},
.probe = dps920ab_probe,
};
module_i2c_driver(dps920ab_driver);
MODULE_AUTHOR("Robert Marko <robert.marko@sartura.hr>");
MODULE_DESCRIPTION("PMBus driver for Delta DPS920AB PSU");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(PMBUS);
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