136 lines
2.8 KiB
C
136 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Synaptics AS370 SoC Hardware Monitoring Driver
|
|
*
|
|
* Copyright (C) 2018 Synaptics Incorporated
|
|
* Author: Jisheng Zhang <jszhang@kernel.org>
|
|
*/
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/hwmon.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_device.h>
|
|
|
|
#define CTRL 0x0
|
|
#define PD BIT(0)
|
|
#define EN BIT(1)
|
|
#define T_SEL BIT(2)
|
|
#define V_SEL BIT(3)
|
|
#define NMOS_SEL BIT(8)
|
|
#define PMOS_SEL BIT(9)
|
|
#define STS 0x4
|
|
#define BN_MASK GENMASK(11, 0)
|
|
#define EOC BIT(12)
|
|
|
|
struct as370_hwmon {
|
|
void __iomem *base;
|
|
};
|
|
|
|
static void init_pvt(struct as370_hwmon *hwmon)
|
|
{
|
|
u32 val;
|
|
void __iomem *addr = hwmon->base + CTRL;
|
|
|
|
val = PD;
|
|
writel_relaxed(val, addr);
|
|
val |= T_SEL;
|
|
writel_relaxed(val, addr);
|
|
val |= EN;
|
|
writel_relaxed(val, addr);
|
|
val &= ~PD;
|
|
writel_relaxed(val, addr);
|
|
}
|
|
|
|
static int as370_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
|
|
u32 attr, int channel, long *temp)
|
|
{
|
|
int val;
|
|
struct as370_hwmon *hwmon = dev_get_drvdata(dev);
|
|
|
|
switch (attr) {
|
|
case hwmon_temp_input:
|
|
val = readl_relaxed(hwmon->base + STS) & BN_MASK;
|
|
*temp = DIV_ROUND_CLOSEST(val * 251802, 4096) - 85525;
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static umode_t
|
|
as370_hwmon_is_visible(const void *data, enum hwmon_sensor_types type,
|
|
u32 attr, int channel)
|
|
{
|
|
if (type != hwmon_temp)
|
|
return 0;
|
|
|
|
switch (attr) {
|
|
case hwmon_temp_input:
|
|
return 0444;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static const struct hwmon_channel_info * const as370_hwmon_info[] = {
|
|
HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT),
|
|
NULL
|
|
};
|
|
|
|
static const struct hwmon_ops as370_hwmon_ops = {
|
|
.is_visible = as370_hwmon_is_visible,
|
|
.read = as370_hwmon_read,
|
|
};
|
|
|
|
static const struct hwmon_chip_info as370_chip_info = {
|
|
.ops = &as370_hwmon_ops,
|
|
.info = as370_hwmon_info,
|
|
};
|
|
|
|
static int as370_hwmon_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *hwmon_dev;
|
|
struct as370_hwmon *hwmon;
|
|
struct device *dev = &pdev->dev;
|
|
|
|
hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL);
|
|
if (!hwmon)
|
|
return -ENOMEM;
|
|
|
|
hwmon->base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(hwmon->base))
|
|
return PTR_ERR(hwmon->base);
|
|
|
|
init_pvt(hwmon);
|
|
|
|
hwmon_dev = devm_hwmon_device_register_with_info(dev,
|
|
"as370",
|
|
hwmon,
|
|
&as370_chip_info,
|
|
NULL);
|
|
return PTR_ERR_OR_ZERO(hwmon_dev);
|
|
}
|
|
|
|
static const struct of_device_id as370_hwmon_match[] = {
|
|
{ .compatible = "syna,as370-hwmon" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, as370_hwmon_match);
|
|
|
|
static struct platform_driver as370_hwmon_driver = {
|
|
.probe = as370_hwmon_probe,
|
|
.driver = {
|
|
.name = "as370-hwmon",
|
|
.of_match_table = as370_hwmon_match,
|
|
},
|
|
};
|
|
module_platform_driver(as370_hwmon_driver);
|
|
|
|
MODULE_AUTHOR("Jisheng Zhang<jszhang@kernel.org>");
|
|
MODULE_DESCRIPTION("Synaptics AS370 SoC hardware monitor");
|
|
MODULE_LICENSE("GPL v2");
|