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// SPDX-License-Identifier: GPL-2.0+
/*
* Hardware monitoring driver for Intersil ISL68137
*
* Copyright (c) 2017 Google Inc
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/hwmon-sysfs.h>
#include "pmbus.h"
#define ISL68137_VOUT_AVS 0x30
static struct pmbus_driver_info isl68137_info = {
.pages = 2,
.format[PSC_VOLTAGE_IN] = direct,
.format[PSC_VOLTAGE_OUT] = direct,
.format[PSC_CURRENT_IN] = direct,
.format[PSC_CURRENT_OUT] = direct,
.format[PSC_POWER] = direct,
.format[PSC_TEMPERATURE] = direct,
.m[PSC_VOLTAGE_IN] = 1,
.b[PSC_VOLTAGE_IN] = 0,
.R[PSC_VOLTAGE_IN] = 3,
.m[PSC_VOLTAGE_OUT] = 1,
.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] = 1,
.m[PSC_POWER] = 1,
.b[PSC_POWER] = 0,
.R[PSC_POWER] = 0,
.m[PSC_TEMPERATURE] = 1,
.b[PSC_TEMPERATURE] = 0,
.R[PSC_TEMPERATURE] = 0,
.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
| PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
| PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP
| PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
};
static ssize_t isl68137_avs_enable_show_page(struct i2c_client *client,
int page,
char *buf)
{
int val = pmbus_read_byte_data(client, page, PMBUS_OPERATION);
return sprintf(buf, "%d\n",
(val & ISL68137_VOUT_AVS) == ISL68137_VOUT_AVS ? 1 : 0);
}
static ssize_t isl68137_avs_enable_store_page(struct i2c_client *client,
int page,
const char *buf, size_t count)
{
int rc, op_val;
if (count < 1) {
rc = -EINVAL;
goto out;
}
switch (buf[0]) {
case '0':
op_val = 0;
break;
case '1':
op_val = ISL68137_VOUT_AVS;
break;
default:
rc = -EINVAL;
goto out;
}
/*
* Writes to VOUT setpoint over AVSBus will persist after the VRM is
* switched to PMBus control. Switching back to AVSBus control
* restores this persisted setpoint rather than re-initializing to
* PMBus VOUT_COMMAND. Writing VOUT_COMMAND first over PMBus before
* enabling AVS control is the workaround.
*/
if (op_val == ISL68137_VOUT_AVS) {
int vout_command = pmbus_read_word_data(client, page,
PMBUS_VOUT_COMMAND);
rc = pmbus_write_word_data(client, page, PMBUS_VOUT_COMMAND,
vout_command);
if (rc)
goto out;
}
rc = pmbus_update_byte_data(client, page, PMBUS_OPERATION,
ISL68137_VOUT_AVS, op_val);
out:
return rc < 0 ? rc : count;
}
static ssize_t isl68137_avs_enable_show(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct i2c_client *client = kobj_to_i2c_client(&dev->kobj);
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
return isl68137_avs_enable_show_page(client, attr->index, buf);
}
static ssize_t isl68137_avs_enable_store(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct i2c_client *client = kobj_to_i2c_client(&dev->kobj);
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
return isl68137_avs_enable_store_page(client, attr->index, buf, count);
}
static SENSOR_DEVICE_ATTR_2(avs0_enabled, 0644,
isl68137_avs_enable_show, isl68137_avs_enable_store,
0, 0);
static SENSOR_DEVICE_ATTR_2(avs1_enabled, 0644,
isl68137_avs_enable_show, isl68137_avs_enable_store,
0, 1);
static int isl68137_remove(struct i2c_client *client);
static int isl68137_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int rc;
rc = pmbus_do_probe(client, id, &isl68137_info);
if (rc)
return rc;
rc = device_create_file(&client->dev,
&sensor_dev_attr_avs0_enabled.dev_attr);
if (rc)
goto out_fail;
rc = device_create_file(&client->dev,
&sensor_dev_attr_avs1_enabled.dev_attr);
if (rc)
goto out_fail;
return rc;
out_fail:
isl68137_remove(client);
return rc;
}
static int isl68137_remove(struct i2c_client *client)
{
device_remove_file(&client->dev,
&sensor_dev_attr_avs1_enabled.dev_attr);
device_remove_file(&client->dev,
&sensor_dev_attr_avs0_enabled.dev_attr);
return pmbus_do_remove(client);
}
static const struct i2c_device_id isl68137_id[] = {
{"isl68137", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, isl68137_id);
/* This is the driver that will be inserted */
static struct i2c_driver isl68137_driver = {
.driver = {
.name = "isl68137",
},
.probe = isl68137_probe,
.remove = isl68137_remove,
.id_table = isl68137_id,
};
module_i2c_driver(isl68137_driver);
MODULE_AUTHOR("Maxim Sloyko <maxims@google.com>");
MODULE_DESCRIPTION("PMBus driver for Intersil ISL68137");
MODULE_LICENSE("GPL");
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