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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* rmi-hwmon.c - hwmon sensor support for side band RMI
*
* Copyright (C) 2025 Advanced Micro Devices, Inc.
*/
#include <linux/err.h>
#include <linux/hwmon.h>
#include <uapi/misc/amd-apml.h>
#include "rmi-core.h"
/* Do not allow setting negative power limit */
#define SBRMI_PWR_MIN 0
static int sbrmi_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
struct sbrmi_data *data = dev_get_drvdata(dev);
struct apml_mbox_msg msg = { 0 };
int ret;
if (!data)
return -ENODEV;
if (type != hwmon_power)
return -EINVAL;
switch (attr) {
case hwmon_power_input:
msg.cmd = SBRMI_READ_PKG_PWR_CONSUMPTION;
ret = rmi_mailbox_xfer(data, &msg);
break;
case hwmon_power_cap:
msg.cmd = SBRMI_READ_PKG_PWR_LIMIT;
ret = rmi_mailbox_xfer(data, &msg);
break;
case hwmon_power_cap_max:
msg.mb_in_out = data->pwr_limit_max;
ret = 0;
break;
default:
return -EINVAL;
}
if (ret < 0)
return ret;
/* hwmon power attributes are in microWatt */
*val = (long)msg.mb_in_out * 1000;
return ret;
}
static int sbrmi_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long val)
{
struct sbrmi_data *data = dev_get_drvdata(dev);
struct apml_mbox_msg msg = { 0 };
if (!data)
return -ENODEV;
if (type != hwmon_power && attr != hwmon_power_cap)
return -EINVAL;
/*
* hwmon power attributes are in microWatt
* mailbox read/write is in mWatt
*/
val /= 1000;
val = clamp_val(val, SBRMI_PWR_MIN, data->pwr_limit_max);
msg.cmd = SBRMI_WRITE_PKG_PWR_LIMIT;
msg.mb_in_out = val;
return rmi_mailbox_xfer(data, &msg);
}
static umode_t sbrmi_is_visible(const void *data,
enum hwmon_sensor_types type,
u32 attr, int channel)
{
switch (type) {
case hwmon_power:
switch (attr) {
case hwmon_power_input:
case hwmon_power_cap_max:
return 0444;
case hwmon_power_cap:
return 0644;
}
break;
default:
break;
}
return 0;
}
static const struct hwmon_channel_info * const sbrmi_info[] = {
HWMON_CHANNEL_INFO(power,
HWMON_P_INPUT | HWMON_P_CAP | HWMON_P_CAP_MAX),
NULL
};
static const struct hwmon_ops sbrmi_hwmon_ops = {
.is_visible = sbrmi_is_visible,
.read = sbrmi_read,
.write = sbrmi_write,
};
static const struct hwmon_chip_info sbrmi_chip_info = {
.ops = &sbrmi_hwmon_ops,
.info = sbrmi_info,
};
int create_hwmon_sensor_device(struct device *dev, struct sbrmi_data *data)
{
struct device *hwmon_dev;
hwmon_dev = devm_hwmon_device_register_with_info(dev, "sbrmi", data,
&sbrmi_chip_info, NULL);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
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