[linux-2.6-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 u32 as370_hwmon_temp_config[] = {
	HWMON_T_INPUT,
	0
};

static const struct hwmon_channel_info as370_hwmon_temp = {
	.type = hwmon_temp,
	.config = as370_hwmon_temp_config,
};

static const struct hwmon_channel_info *as370_hwmon_info[] = {
	&as370_hwmon_temp,
	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 resource *res;
	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;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	hwmon->base = devm_ioremap_resource(&pdev->dev, res);
	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
79	static const u32 as370_hwmon_temp_config[] = {
80	HWMON_T_INPUT,
81	0
82	};
83
84	static const struct hwmon_channel_info as370_hwmon_temp = {
85	.type = hwmon_temp,
86	.config = as370_hwmon_temp_config,
87	};
88
89	static const struct hwmon_channel_info *as370_hwmon_info[] = {
90	&as370_hwmon_temp,
91	NULL
92	};
93
94	static const struct hwmon_ops as370_hwmon_ops = {
95	.is_visible = as370_hwmon_is_visible,
96	.read = as370_hwmon_read,
97	};
98
99	static const struct hwmon_chip_info as370_chip_info = {
100	.ops = &as370_hwmon_ops,
101	.info = as370_hwmon_info,
102	};
103
104	static int as370_hwmon_probe(struct platform_device *pdev)
105	{
106	struct resource *res;
107	struct device *hwmon_dev;
108	struct as370_hwmon *hwmon;
109	struct device *dev = &pdev->dev;
110
111	hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL);
112	if (!hwmon)
113	return -ENOMEM;
114
115	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
116	hwmon->base = devm_ioremap_resource(&pdev->dev, res);
117	if (IS_ERR(hwmon->base))
118	return PTR_ERR(hwmon->base);
119
120	init_pvt(hwmon);
121
122	hwmon_dev = devm_hwmon_device_register_with_info(dev,
123	"as370",
124	hwmon,
125	&as370_chip_info,
126	NULL);
127	return PTR_ERR_OR_ZERO(hwmon_dev);
128	}
129
130	static const struct of_device_id as370_hwmon_match[] = {
131	{ .compatible = "syna,as370-hwmon" },
132	{},
133	};
134	MODULE_DEVICE_TABLE(of, as370_hwmon_match);
135
136	static struct platform_driver as370_hwmon_driver = {
137	.probe = as370_hwmon_probe,
138	.driver = {
139	.name = "as370-hwmon",
140	.of_match_table = as370_hwmon_match,
141	},
142	};
143	module_platform_driver(as370_hwmon_driver);
144
145	MODULE_AUTHOR("Jisheng Zhang<jszhang@kernel.org>");
146	MODULE_DESCRIPTION("Synaptics AS370 SoC hardware monitor");
147	MODULE_LICENSE("GPL v2");