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135 lines
2.8 KiB
135 lines
2.8 KiB
// 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 <[email protected]> |
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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<[email protected]>"); |
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MODULE_DESCRIPTION("Synaptics AS370 SoC hardware monitor"); |
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MODULE_LICENSE("GPL v2");
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