Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Hardware monitoring driver for LTC3815
 *
 * Copyright (c) 2015 Linear Technology
 * Copyright (c) 2015 Guenter Roeck
 */
 
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include "pmbus.h"
 
#define LTC3815_MFR_IOUT_PEAK	0xd7
#define LTC3815_MFR_VOUT_PEAK	0xdd
#define LTC3815_MFR_VIN_PEAK	0xde
#define LTC3815_MFR_TEMP_PEAK	0xdf
#define LTC3815_MFR_IIN_PEAK	0xe1
#define LTC3815_MFR_SPECIAL_ID	0xe7
 
#define LTC3815_ID		0x8000
#define LTC3815_ID_MASK		0xff00
 
static int ltc3815_read_byte_data(struct i2c_client *client, int page, int reg)
{
<------>int ret;
 
<------>switch (reg) {
<------>case PMBUS_VOUT_MODE:
<------><------>/*
<------><------> * The chip returns 0x3e, suggesting VID mode with manufacturer
<------><------> * specific VID codes. Since the output voltage is reported
<------><------> * with a LSB of 0.5mV, override and report direct mode with
<------><------> * appropriate coefficients.
<------><------> */
<------><------>ret = 0x40;
<------><------>break;
<------>default:
<------><------>ret = -ENODATA;
<------><------>break;
<------>}
<------>return ret;
}
 
static int ltc3815_write_byte(struct i2c_client *client, int page, u8 reg)
{
<------>int ret;
 
<------>switch (reg) {
<------>case PMBUS_CLEAR_FAULTS:
<------><------>/*
<------><------> * LTC3815 does not support the CLEAR_FAULTS command.
<------><------> * Emulate it by clearing the status register.
<------><------> */
<------><------>ret = pmbus_read_word_data(client, 0, 0xff, PMBUS_STATUS_WORD);
<------><------>if (ret > 0) {
<------><------><------>pmbus_write_word_data(client, 0, PMBUS_STATUS_WORD,
<------><------><------><------><------>      ret);
<------><------><------>ret = 0;
<------><------>}
<------><------>break;
<------>default:
<------><------>ret = -ENODATA;
<------><------>break;
<------>}
<------>return ret;
}
 
static int ltc3815_read_word_data(struct i2c_client *client, int page,
<------><------><------><------>  int phase, int reg)
{
<------>int ret;
 
<------>switch (reg) {
<------>case PMBUS_VIRT_READ_VIN_MAX:
<------><------>ret = pmbus_read_word_data(client, page, phase,
<------><------><------><------><------>   LTC3815_MFR_VIN_PEAK);
<------><------>break;
<------>case PMBUS_VIRT_READ_VOUT_MAX:
<------><------>ret = pmbus_read_word_data(client, page, phase,
<------><------><------><------><------>   LTC3815_MFR_VOUT_PEAK);
<------><------>break;
<------>case PMBUS_VIRT_READ_TEMP_MAX:
<------><------>ret = pmbus_read_word_data(client, page, phase,
<------><------><------><------><------>   LTC3815_MFR_TEMP_PEAK);
<------><------>break;
<------>case PMBUS_VIRT_READ_IOUT_MAX:
<------><------>ret = pmbus_read_word_data(client, page, phase,
<------><------><------><------><------>   LTC3815_MFR_IOUT_PEAK);
<------><------>break;
<------>case PMBUS_VIRT_READ_IIN_MAX:
<------><------>ret = pmbus_read_word_data(client, page, phase,
<------><------><------><------><------>   LTC3815_MFR_IIN_PEAK);
<------><------>break;
<------>case PMBUS_VIRT_RESET_VOUT_HISTORY:
<------>case PMBUS_VIRT_RESET_VIN_HISTORY:
<------>case PMBUS_VIRT_RESET_TEMP_HISTORY:
<------>case PMBUS_VIRT_RESET_IOUT_HISTORY:
<------>case PMBUS_VIRT_RESET_IIN_HISTORY:
<------><------>ret = 0;
<------><------>break;
<------>default:
<------><------>ret = -ENODATA;
<------><------>break;
<------>}
<------>return ret;
}
 
static int ltc3815_write_word_data(struct i2c_client *client, int page,
<------><------><------><------>   int reg, u16 word)
{
<------>int ret;
 
<------>switch (reg) {
<------>case PMBUS_VIRT_RESET_IIN_HISTORY:
<------><------>ret = pmbus_write_word_data(client, page,
<------><------><------><------><------>    LTC3815_MFR_IIN_PEAK, 0);
<------><------>break;
<------>case PMBUS_VIRT_RESET_IOUT_HISTORY:
<------><------>ret = pmbus_write_word_data(client, page,
<------><------><------><------><------>    LTC3815_MFR_IOUT_PEAK, 0);
<------><------>break;
<------>case PMBUS_VIRT_RESET_VOUT_HISTORY:
<------><------>ret = pmbus_write_word_data(client, page,
<------><------><------><------><------>    LTC3815_MFR_VOUT_PEAK, 0);
<------><------>break;
<------>case PMBUS_VIRT_RESET_VIN_HISTORY:
<------><------>ret = pmbus_write_word_data(client, page,
<------><------><------><------><------>    LTC3815_MFR_VIN_PEAK, 0);
<------><------>break;
<------>case PMBUS_VIRT_RESET_TEMP_HISTORY:
<------><------>ret = pmbus_write_word_data(client, page,
<------><------><------><------><------>    LTC3815_MFR_TEMP_PEAK, 0);
<------><------>break;
<------>default:
<------><------>ret = -ENODATA;
<------><------>break;
<------>}
<------>return ret;
}
 
static const struct i2c_device_id ltc3815_id[] = {
<------>{"ltc3815", 0},
<------>{ }
};
MODULE_DEVICE_TABLE(i2c, ltc3815_id);
 
static struct pmbus_driver_info ltc3815_info = {
<------>.pages = 1,
<------>.format[PSC_VOLTAGE_IN] = direct,
<------>.format[PSC_VOLTAGE_OUT] = direct,
<------>.format[PSC_CURRENT_IN] = direct,
<------>.format[PSC_CURRENT_OUT] = direct,
<------>.format[PSC_TEMPERATURE] = direct,
<------>.m[PSC_VOLTAGE_IN] = 250,
<------>.b[PSC_VOLTAGE_IN] = 0,
<------>.R[PSC_VOLTAGE_IN] = 0,
<------>.m[PSC_VOLTAGE_OUT] = 2,
<------>.b[PSC_VOLTAGE_OUT] = 0,
<------>.R[PSC_VOLTAGE_OUT] = 3,
<------>.m[PSC_CURRENT_IN] = 1,
<------>.b[PSC_CURRENT_IN] = 0,
<------>.R[PSC_CURRENT_IN] = 2,
<------>.m[PSC_CURRENT_OUT] = 1,
<------>.b[PSC_CURRENT_OUT] = 0,
<------>.R[PSC_CURRENT_OUT] = 2,
<------>.m[PSC_TEMPERATURE] = 1,
<------>.b[PSC_TEMPERATURE] = 0,
<------>.R[PSC_TEMPERATURE] = 0,
<------>.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_VOUT |
<------><------>PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP,
<------>.read_byte_data = ltc3815_read_byte_data,
<------>.read_word_data = ltc3815_read_word_data,
<------>.write_byte = ltc3815_write_byte,
<------>.write_word_data = ltc3815_write_word_data,
};
 
static int ltc3815_probe(struct i2c_client *client)
{
<------>int chip_id;
 
<------>if (!i2c_check_functionality(client->adapter,
<------><------><------><------>     I2C_FUNC_SMBUS_READ_WORD_DATA))
<------><------>return -ENODEV;
 
<------>chip_id = i2c_smbus_read_word_data(client, LTC3815_MFR_SPECIAL_ID);
<------>if (chip_id < 0)
<------><------>return chip_id;
<------>if ((chip_id & LTC3815_ID_MASK) != LTC3815_ID)
<------><------>return -ENODEV;
 
<------>return pmbus_do_probe(client, &ltc3815_info);
}
 
static struct i2c_driver ltc3815_driver = {
<------>.driver = {
<------><------>   .name = "ltc3815",
<------><------>   },
<------>.probe_new = ltc3815_probe,
<------>.remove = pmbus_do_remove,
<------>.id_table = ltc3815_id,
};
 
module_i2c_driver(ltc3815_driver);
 
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for LTC3815");
MODULE_LICENSE("GPL");