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// SPDX-License-Identifier: GPL-2.0+
/*
* Hardware monitoring driver for Infineon PXE1610
*
* Copyright (c) 2019 Facebook Inc
*
*/
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include "pmbus.h"
#define PXE1610_NUM_PAGES 3
/* Identify chip parameters. */
static int pxe1610_identify(struct i2c_client *client,
struct pmbus_driver_info *info)
{
int i;
for (i = 0; i < PXE1610_NUM_PAGES; i++) {
if (pmbus_check_byte_register(client, i, PMBUS_VOUT_MODE)) {
u8 vout_mode;
int ret;
/* Read the register with VOUT scaling value.*/
ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
if (ret < 0)
return ret;
vout_mode = ret & GENMASK(4, 0);
switch (vout_mode) {
case 1:
info->vrm_version[i] = vr12;
break;
case 2:
info->vrm_version[i] = vr13;
break;
default:
/*
* If prior pages are available limit operation
* to them
*/
if (i != 0) {
info->pages = i;
return 0;
}
return -ENODEV;
}
}
}
return 0;
}
static struct pmbus_driver_info pxe1610_info = {
.pages = PXE1610_NUM_PAGES,
.format[PSC_VOLTAGE_IN] = linear,
.format[PSC_VOLTAGE_OUT] = vid,
.format[PSC_CURRENT_IN] = linear,
.format[PSC_CURRENT_OUT] = linear,
.format[PSC_TEMPERATURE] = linear,
.format[PSC_POWER] = linear,
.func[0] = PMBUS_HAVE_VIN
| PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
| PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
| PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
| PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
.func[1] = PMBUS_HAVE_VIN
| PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
| PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
| PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
| PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
.func[2] = PMBUS_HAVE_VIN
| PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
| PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
| PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
| PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
.identify = pxe1610_identify,
};
static int pxe1610_probe(struct i2c_client *client)
{
struct pmbus_driver_info *info;
u8 buf[I2C_SMBUS_BLOCK_MAX];
int ret;
if (!i2c_check_functionality(
client->adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA
| I2C_FUNC_SMBUS_READ_WORD_DATA
| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
return -ENODEV;
/*
* By default this device doesn't boot to page 0, so set page 0
* to access all pmbus registers.
*/
i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
/* Read Manufacturer id */
ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
if (ret < 0) {
dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
return ret;
}
if (ret != 2 || strncmp(buf, "XP", 2)) {
dev_err(&client->dev, "MFR_ID unrecognized\n");
return -ENODEV;
}
info = devm_kmemdup(&client->dev, &pxe1610_info,
sizeof(struct pmbus_driver_info),
GFP_KERNEL);
if (!info)
return -ENOMEM;
return pmbus_do_probe(client, info);
}
static const struct i2c_device_id pxe1610_id[] = {
{"pxe1610"},
{"pxe1110"},
{"pxm1310"},
{}
};
MODULE_DEVICE_TABLE(i2c, pxe1610_id);
static struct i2c_driver pxe1610_driver = {
.driver = {
.name = "pxe1610",
},
.probe = pxe1610_probe,
.id_table = pxe1610_id,
};
module_i2c_driver(pxe1610_driver);
MODULE_AUTHOR("Vijay Khemka <vijaykhemka@fb.com>");
MODULE_DESCRIPTION("PMBus driver for Infineon PXE1610, PXE1110 and PXM1310");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(PMBUS);
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