fp9931-hwmon.c
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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Fitipower FP9931 PMIC temperature monitor driver
*
* Copyright 2021 NXP
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/mfd/fp9931.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
struct fp9931_hwmon {
struct device *dev;
struct device *hwmon_dev;
struct fp9931 *fp9931;
struct regulator *en_ts;
};
static ssize_t fp9931_hwmon_temp_show(struct device *dev,
struct device_attribute *attr, char *buf);
static SENSOR_DEVICE_ATTR_RO(temp1_input, fp9931_hwmon_temp, 0);
static struct attribute *fp9931_hwmon_attrs[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
NULL
};
ATTRIBUTE_GROUPS(fp9931_hwmon);
static ssize_t fp9931_hwmon_temp_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int ret;
u8 tmst_value;
struct fp9931_hwmon *hwmon = dev_get_drvdata(dev);
ret = fp9931_reg_read(hwmon->fp9931->client,
FP9931_TMST_VALUE,
&tmst_value);
if (ret)
return ret;
return sprintf(buf, "%d\n", (s32)((s8)tmst_value));
}
static int fp9931_hwmon_probe(struct platform_device *pdev)
{
int ret;
struct fp9931_hwmon *hwmon;
hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL);
if (!hwmon)
return -ENOMEM;
hwmon->dev = &pdev->dev;
hwmon->en_ts = devm_regulator_get(pdev->dev.parent, "en-ts");
if (IS_ERR(hwmon->en_ts)) {
ret = PTR_ERR(hwmon->en_ts);
dev_err(&pdev->dev, "failed to get en-ts regulator : %d\n", ret);
return ret;
}
hwmon->hwmon_dev = devm_hwmon_device_register_with_groups(hwmon->dev,
"fp9931_hwmon", hwmon,
fp9931_hwmon_groups);
if (IS_ERR(hwmon->hwmon_dev)) {
ret = PTR_ERR(hwmon->hwmon_dev);
dev_err(hwmon->dev, "failed to register hwmon for fp9931 : %d\n", ret);
return ret;
}
hwmon->fp9931 = dev_get_drvdata(pdev->dev.parent);
WARN_ON(IS_ERR_OR_NULL(hwmon->fp9931));
platform_set_drvdata(pdev, hwmon);
return regulator_enable(hwmon->en_ts);
}
static int fp9931_hwmon_remove(struct platform_device *pdev)
{
struct fp9931_hwmon *hwmon = platform_get_drvdata(pdev);
return regulator_disable(hwmon->en_ts);
}
static const struct platform_device_id fp9931_hwmon_id[] = {
{ "fp9931-hwmon", 0 },
{ /* sentinel */ },
};
static struct platform_driver fp9931_hwmon_driver = {
.probe = fp9931_hwmon_probe,
.remove = fp9931_hwmon_remove,
.id_table = fp9931_hwmon_id,
.driver = {
.name = "fp9931_hwmon",
},
};
module_platform_driver(fp9931_hwmon_driver);
MODULE_DESCRIPTION("FP9931 hardware monitor driver");
MODULE_AUTHOR("Fancy Fang <chen.fang@nxp.com>");
MODULE_LICENSE("GPL");