// 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 *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");