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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* rmi-i2c.c - Side band RMI over I2C support for AMD out
* of band management
*
* Copyright (C) 2024 Advanced Micro Devices, Inc.
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include "rmi-core.h"
static int sbrmi_enable_alert(struct sbrmi_data *data)
{
int ctrl, ret;
/*
* Enable the SB-RMI Software alert status
* by writing 0 to bit 4 of Control register(0x1)
*/
ret = regmap_read(data->regmap, SBRMI_CTRL, &ctrl);
if (ret < 0)
return ret;
if (ctrl & 0x10) {
ctrl &= ~0x10;
return regmap_write(data->regmap, SBRMI_CTRL, ctrl);
}
return 0;
}
static int sbrmi_get_max_pwr_limit(struct sbrmi_data *data)
{
struct apml_mbox_msg msg = { 0 };
int ret;
msg.cmd = SBRMI_READ_PKG_MAX_PWR_LIMIT;
ret = rmi_mailbox_xfer(data, &msg);
if (ret < 0)
return ret;
data->pwr_limit_max = msg.mb_in_out;
return ret;
}
static int sbrmi_i2c_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct sbrmi_data *data;
struct regmap_config sbrmi_i2c_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
int ret;
data = devm_kzalloc(dev, sizeof(struct sbrmi_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
mutex_init(&data->lock);
data->regmap = devm_regmap_init_i2c(client, &sbrmi_i2c_regmap_config);
if (IS_ERR(data->regmap))
return PTR_ERR(data->regmap);
/* Enable alert for SB-RMI sequence */
ret = sbrmi_enable_alert(data);
if (ret < 0)
return ret;
/* Cache maximum power limit */
ret = sbrmi_get_max_pwr_limit(data);
if (ret < 0)
return ret;
data->dev_static_addr = client->addr;
dev_set_drvdata(dev, data);
ret = create_hwmon_sensor_device(dev, data);
if (ret < 0)
return ret;
return create_misc_rmi_device(data, dev);
}
static void sbrmi_i2c_remove(struct i2c_client *client)
{
struct sbrmi_data *data = dev_get_drvdata(&client->dev);
misc_deregister(&data->sbrmi_misc_dev);
/* Assign fops and parent of misc dev to NULL */
data->sbrmi_misc_dev.fops = NULL;
data->sbrmi_misc_dev.parent = NULL;
dev_info(&client->dev, "Removed sbrmi-i2c driver\n");
return;
}
static const struct i2c_device_id sbrmi_id[] = {
{"sbrmi-i2c"},
{}
};
MODULE_DEVICE_TABLE(i2c, sbrmi_id);
static const struct of_device_id __maybe_unused sbrmi_of_match[] = {
{
.compatible = "amd,sbrmi",
},
{ },
};
MODULE_DEVICE_TABLE(of, sbrmi_of_match);
static struct i2c_driver sbrmi_driver = {
.driver = {
.name = "sbrmi-i2c",
.of_match_table = of_match_ptr(sbrmi_of_match),
},
.probe = sbrmi_i2c_probe,
.remove = sbrmi_i2c_remove,
.id_table = sbrmi_id,
};
module_i2c_driver(sbrmi_driver);
MODULE_AUTHOR("Akshay Gupta <akshay.gupta@amd.com>");
MODULE_AUTHOR("Naveen Krishna Chatradhi <naveenkrishna.chatradhi@amd.com>");
MODULE_DESCRIPTION("Hwmon driver for AMD SB-RMI emulated sensor");
MODULE_LICENSE("GPL");
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