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