[linux-block.git] / drivers / hwmon / as370-hwmon.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");
Commit	Line	Data
7548666e JZ	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Synaptics AS370 SoC Hardware Monitoring Driver
	4	*
	5	* Copyright (C) 2018 Synaptics Incorporated
	6	* Author: Jisheng Zhang <jszhang@kernel.org>
	7	*/
	8
	9	#include <linux/bitops.h>
	10	#include <linux/hwmon.h>
	11	#include <linux/init.h>
	12	#include <linux/io.h>
	13	#include <linux/module.h>
	14	#include <linux/of_device.h>
	15
	16	#define CTRL 0x0
	17	#define PD BIT(0)
	18	#define EN BIT(1)
	19	#define T_SEL BIT(2)
	20	#define V_SEL BIT(3)
	21	#define NMOS_SEL BIT(8)
	22	#define PMOS_SEL BIT(9)
	23	#define STS 0x4
	24	#define BN_MASK GENMASK(11, 0)
	25	#define EOC BIT(12)
	26
	27	struct as370_hwmon {
	28	void __iomem *base;
	29	};
	30
	31	static void init_pvt(struct as370_hwmon *hwmon)
	32	{
	33	u32 val;
	34	void __iomem *addr = hwmon->base + CTRL;
	35
	36	val = PD;
	37	writel_relaxed(val, addr);
	38	val \|= T_SEL;
	39	writel_relaxed(val, addr);
	40	val \|= EN;
	41	writel_relaxed(val, addr);
	42	val &= ~PD;
	43	writel_relaxed(val, addr);
	44	}
	45
	46	static int as370_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
	47	u32 attr, int channel, long *temp)
	48	{
	49	int val;
	50	struct as370_hwmon *hwmon = dev_get_drvdata(dev);
	51
	52	switch (attr) {
	53	case hwmon_temp_input:
	54	val = readl_relaxed(hwmon->base + STS) & BN_MASK;
	55	temp = DIV_ROUND_CLOSEST(val 251802, 4096) - 85525;
	56	break;
	57	default:
	58	return -EOPNOTSUPP;
	59	}
	60
	61	return 0;
	62	}
	63
	64	static umode_t
65	as370_hwmon_is_visible(const void *data, enum hwmon_sensor_types type,
66	u32 attr, int channel)
67	{
68	if (type != hwmon_temp)
69	return 0;
70
71	switch (attr) {
72	case hwmon_temp_input:
73	return 0444;
74	default:
75	return 0;
76	}
77	}
78
69a1ffca	79	static const struct hwmon_channel_info * const as370_hwmon_info[] = {
6b767ccd	80	HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT),
7548666e JZ	81	NULL
	82	};
	83
	84	static const struct hwmon_ops as370_hwmon_ops = {
	85	.is_visible = as370_hwmon_is_visible,
	86	.read = as370_hwmon_read,
	87	};
	88
	89	static const struct hwmon_chip_info as370_chip_info = {
	90	.ops = &as370_hwmon_ops,
	91	.info = as370_hwmon_info,
	92	};
	93
	94	static int as370_hwmon_probe(struct platform_device *pdev)
	95	{
7548666e JZ	96	struct device *hwmon_dev;
	97	struct as370_hwmon *hwmon;
	98	struct device *dev = &pdev->dev;
	99
	100	hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL);
	101	if (!hwmon)
	102	return -ENOMEM;
	103
09fe7870	104	hwmon->base = devm_platform_ioremap_resource(pdev, 0);
7548666e JZ	105	if (IS_ERR(hwmon->base))
	106	return PTR_ERR(hwmon->base);
	107
	108	init_pvt(hwmon);
	109
	110	hwmon_dev = devm_hwmon_device_register_with_info(dev,
	111	"as370",
	112	hwmon,
	113	&as370_chip_info,
	114	NULL);
	115	return PTR_ERR_OR_ZERO(hwmon_dev);
	116	}
	117
	118	static const struct of_device_id as370_hwmon_match[] = {
	119	{ .compatible = "syna,as370-hwmon" },
	120	{},
	121	};
	122	MODULE_DEVICE_TABLE(of, as370_hwmon_match);
	123
	124	static struct platform_driver as370_hwmon_driver = {
	125	.probe = as370_hwmon_probe,
	126	.driver = {
	127	.name = "as370-hwmon",
	128	.of_match_table = as370_hwmon_match,
	129	},
	130	};
	131	module_platform_driver(as370_hwmon_driver);
	132
	133	MODULE_AUTHOR("Jisheng Zhang<jszhang@kernel.org>");
	134	MODULE_DESCRIPTION("Synaptics AS370 SoC hardware monitor");
	135	MODULE_LICENSE("GPL v2");