[linux-block.git] / drivers / hwmon / vexpress-hwmon.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *
 * Copyright (C) 2012 ARM Limited
 */

#define DRVNAME "vexpress-hwmon"
#define pr_fmt(fmt) DRVNAME ": " fmt

#include <linux/device.h>
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/vexpress.h>

struct vexpress_hwmon_data {
	struct device *hwmon_dev;
	struct regmap *reg;
};

static ssize_t vexpress_hwmon_label_show(struct device *dev,
		struct device_attribute *dev_attr, char *buffer)
{
	const char *label = of_get_property(dev->of_node, "label", NULL);

	return sysfs_emit(buffer, "%s\n", label);
}

static ssize_t vexpress_hwmon_u32_show(struct device *dev,
		struct device_attribute *dev_attr, char *buffer)
{
	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
	int err;
	u32 value;

	err = regmap_read(data->reg, 0, &value);
	if (err)
		return err;

	return sysfs_emit(buffer, "%u\n", value /
			  to_sensor_dev_attr(dev_attr)->index);
}

static ssize_t vexpress_hwmon_u64_show(struct device *dev,
		struct device_attribute *dev_attr, char *buffer)
{
	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
	int err;
	u32 value_hi, value_lo;

	err = regmap_read(data->reg, 0, &value_lo);
	if (err)
		return err;

	err = regmap_read(data->reg, 1, &value_hi);
	if (err)
		return err;

	return sysfs_emit(buffer, "%llu\n",
			  div_u64(((u64)value_hi << 32) | value_lo,
				  to_sensor_dev_attr(dev_attr)->index));
}

static umode_t vexpress_hwmon_attr_is_visible(struct kobject *kobj,
		struct attribute *attr, int index)
{
	struct device *dev = kobj_to_dev(kobj);
	struct device_attribute *dev_attr = container_of(attr,
				struct device_attribute, attr);

	if (dev_attr->show == vexpress_hwmon_label_show &&
			!of_get_property(dev->of_node, "label", NULL))
		return 0;

	return attr->mode;
}

struct vexpress_hwmon_type {
	const char *name;
	const struct attribute_group **attr_groups;
};

#if !defined(CONFIG_REGULATOR_VEXPRESS)
static DEVICE_ATTR(in1_label, 0444, vexpress_hwmon_label_show, NULL);
static SENSOR_DEVICE_ATTR_RO(in1_input, vexpress_hwmon_u32, 1000);
static struct attribute *vexpress_hwmon_attrs_volt[] = {
	&dev_attr_in1_label.attr,
	&sensor_dev_attr_in1_input.dev_attr.attr,
	NULL
};
static struct attribute_group vexpress_hwmon_group_volt = {
	.is_visible = vexpress_hwmon_attr_is_visible,
	.attrs = vexpress_hwmon_attrs_volt,
};
static struct vexpress_hwmon_type vexpress_hwmon_volt = {
	.name = "vexpress_volt",
	.attr_groups = (const struct attribute_group *[]) {
		&vexpress_hwmon_group_volt,
		NULL,
	},
};
#endif

static DEVICE_ATTR(curr1_label, 0444, vexpress_hwmon_label_show, NULL);
static SENSOR_DEVICE_ATTR_RO(curr1_input, vexpress_hwmon_u32, 1000);
static struct attribute *vexpress_hwmon_attrs_amp[] = {
	&dev_attr_curr1_label.attr,
	&sensor_dev_attr_curr1_input.dev_attr.attr,
	NULL
};
static struct attribute_group vexpress_hwmon_group_amp = {
	.is_visible = vexpress_hwmon_attr_is_visible,
	.attrs = vexpress_hwmon_attrs_amp,
};
static struct vexpress_hwmon_type vexpress_hwmon_amp = {
	.name = "vexpress_amp",
	.attr_groups = (const struct attribute_group *[]) {
		&vexpress_hwmon_group_amp,
		NULL
	},
};

static DEVICE_ATTR(temp1_label, 0444, vexpress_hwmon_label_show, NULL);
static SENSOR_DEVICE_ATTR_RO(temp1_input, vexpress_hwmon_u32, 1000);
static struct attribute *vexpress_hwmon_attrs_temp[] = {
	&dev_attr_temp1_label.attr,
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	NULL
};
static struct attribute_group vexpress_hwmon_group_temp = {
	.is_visible = vexpress_hwmon_attr_is_visible,
	.attrs = vexpress_hwmon_attrs_temp,
};
static struct vexpress_hwmon_type vexpress_hwmon_temp = {
	.name = "vexpress_temp",
	.attr_groups = (const struct attribute_group *[]) {
		&vexpress_hwmon_group_temp,
		NULL
	},
};

static DEVICE_ATTR(power1_label, 0444, vexpress_hwmon_label_show, NULL);
static SENSOR_DEVICE_ATTR_RO(power1_input, vexpress_hwmon_u32, 1);
static struct attribute *vexpress_hwmon_attrs_power[] = {
	&dev_attr_power1_label.attr,
	&sensor_dev_attr_power1_input.dev_attr.attr,
	NULL
};
static struct attribute_group vexpress_hwmon_group_power = {
	.is_visible = vexpress_hwmon_attr_is_visible,
	.attrs = vexpress_hwmon_attrs_power,
};
static struct vexpress_hwmon_type vexpress_hwmon_power = {
	.name = "vexpress_power",
	.attr_groups = (const struct attribute_group *[]) {
		&vexpress_hwmon_group_power,
		NULL
	},
};

static DEVICE_ATTR(energy1_label, 0444, vexpress_hwmon_label_show, NULL);
static SENSOR_DEVICE_ATTR_RO(energy1_input, vexpress_hwmon_u64, 1);
static struct attribute *vexpress_hwmon_attrs_energy[] = {
	&dev_attr_energy1_label.attr,
	&sensor_dev_attr_energy1_input.dev_attr.attr,
	NULL
};
static struct attribute_group vexpress_hwmon_group_energy = {
	.is_visible = vexpress_hwmon_attr_is_visible,
	.attrs = vexpress_hwmon_attrs_energy,
};
static struct vexpress_hwmon_type vexpress_hwmon_energy = {
	.name = "vexpress_energy",
	.attr_groups = (const struct attribute_group *[]) {
		&vexpress_hwmon_group_energy,
		NULL
	},
};

static const struct of_device_id vexpress_hwmon_of_match[] = {
#if !defined(CONFIG_REGULATOR_VEXPRESS)
	{
		.compatible = "arm,vexpress-volt",
		.data = &vexpress_hwmon_volt,
	},
#endif
	{
		.compatible = "arm,vexpress-amp",
		.data = &vexpress_hwmon_amp,
	}, {
		.compatible = "arm,vexpress-temp",
		.data = &vexpress_hwmon_temp,
	}, {
		.compatible = "arm,vexpress-power",
		.data = &vexpress_hwmon_power,
	}, {
		.compatible = "arm,vexpress-energy",
		.data = &vexpress_hwmon_energy,
	},
	{}
};
MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match);

static int vexpress_hwmon_probe(struct platform_device *pdev)
{
	struct vexpress_hwmon_data *data;
	const struct vexpress_hwmon_type *type;

	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;
	platform_set_drvdata(pdev, data);

	type = of_device_get_match_data(&pdev->dev);
	if (!type)
		return -ENODEV;

	data->reg = devm_regmap_init_vexpress_config(&pdev->dev);
	if (IS_ERR(data->reg))
		return PTR_ERR(data->reg);

	data->hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
			type->name, data, type->attr_groups);

	return PTR_ERR_OR_ZERO(data->hwmon_dev);
}

static struct platform_driver vexpress_hwmon_driver = {
	.probe = vexpress_hwmon_probe,
	.driver	= {
		.name = DRVNAME,
		.of_match_table = vexpress_hwmon_of_match,
	},
};

module_platform_driver(vexpress_hwmon_driver);

MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
MODULE_DESCRIPTION("Versatile Express hwmon sensors driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:vexpress-hwmon");
Commit	Line	Data
1802d0be	1	// SPDX-License-Identifier: GPL-2.0-only
48ed8877	2	/*
48ed8877 PM	3	*
	4	* Copyright (C) 2012 ARM Limited
	5	*/
	6
	7	#define DRVNAME "vexpress-hwmon"
	8	#define pr_fmt(fmt) DRVNAME ": " fmt
	9
	10	#include <linux/device.h>
	11	#include <linux/err.h>
	12	#include <linux/hwmon.h>
	13	#include <linux/hwmon-sysfs.h>
	14	#include <linux/module.h>
08245ad8	15	#include <linux/of.h>
48ed8877 PM	16	#include <linux/of_device.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/vexpress.h>
	19
	20	struct vexpress_hwmon_data {
	21	struct device *hwmon_dev;
3b9334ac	22	struct regmap *reg;
48ed8877 PM	23	};
48ed8877 PM	24
48ed8877 PM	25	static ssize_t vexpress_hwmon_label_show(struct device *dev,
	26	struct device_attribute dev_attr, char buffer)
	27	{
	28	const char *label = of_get_property(dev->of_node, "label", NULL);
	29
1f4d4af4	30	return sysfs_emit(buffer, "%s\n", label);
48ed8877 PM	31	}
	32
	33	static ssize_t vexpress_hwmon_u32_show(struct device *dev,
	34	struct device_attribute dev_attr, char buffer)
	35	{
	36	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
	37	int err;
	38	u32 value;
	39
3b9334ac	40	err = regmap_read(data->reg, 0, &value);
48ed8877 PM	41	if (err)
	42	return err;
	43
1f4d4af4 GR	44	return sysfs_emit(buffer, "%u\n", value /
1f4d4af4 GR	45	to_sensor_dev_attr(dev_attr)->index);
48ed8877 PM	46	}
	47
	48	static ssize_t vexpress_hwmon_u64_show(struct device *dev,
	49	struct device_attribute dev_attr, char buffer)
	50	{
	51	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
	52	int err;
	53	u32 value_hi, value_lo;
	54
3b9334ac	55	err = regmap_read(data->reg, 0, &value_lo);
48ed8877 PM	56	if (err)
	57	return err;
	58
3b9334ac	59	err = regmap_read(data->reg, 1, &value_hi);
48ed8877 PM	60	if (err)
	61	return err;
	62
1f4d4af4 GR	63	return sysfs_emit(buffer, "%llu\n",
	64	div_u64(((u64)value_hi << 32) \| value_lo,
	65	to_sensor_dev_attr(dev_attr)->index));
48ed8877 PM	66	}
48ed8877 PM	67
b2e5411e PM	68	static umode_t vexpress_hwmon_attr_is_visible(struct kobject *kobj,
	69	struct attribute *attr, int index)
	70	{
	71	struct device *dev = kobj_to_dev(kobj);
	72	struct device_attribute *dev_attr = container_of(attr,
	73	struct device_attribute, attr);
	74
	75	if (dev_attr->show == vexpress_hwmon_label_show &&
	76	!of_get_property(dev->of_node, "label", NULL))
	77	return 0;
	78
	79	return attr->mode;
	80	}
	81
52feaca5 PM	82	struct vexpress_hwmon_type {
	83	const char *name;
	84	const struct attribute_group **attr_groups;
	85	};
	86
48ed8877	87	#if !defined(CONFIG_REGULATOR_VEXPRESS)
fa75f745 GR	88	static DEVICE_ATTR(in1_label, 0444, vexpress_hwmon_label_show, NULL);
fa75f745 GR	89	static SENSOR_DEVICE_ATTR_RO(in1_input, vexpress_hwmon_u32, 1000);
78cebd08 PM	90	static struct attribute *vexpress_hwmon_attrs_volt[] = {
	91	&dev_attr_in1_label.attr,
	92	&sensor_dev_attr_in1_input.dev_attr.attr,
	93	NULL
	94	};
48ed8877	95	static struct attribute_group vexpress_hwmon_group_volt = {
b2e5411e	96	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	97	.attrs = vexpress_hwmon_attrs_volt,
48ed8877 PM	98	};
52feaca5 PM	99	static struct vexpress_hwmon_type vexpress_hwmon_volt = {
	100	.name = "vexpress_volt",
	101	.attr_groups = (const struct attribute_group *[]) {
	102	&vexpress_hwmon_group_volt,
	103	NULL,
	104	},
	105	};
48ed8877 PM	106	#endif
48ed8877 PM	107
fa75f745 GR	108	static DEVICE_ATTR(curr1_label, 0444, vexpress_hwmon_label_show, NULL);
fa75f745 GR	109	static SENSOR_DEVICE_ATTR_RO(curr1_input, vexpress_hwmon_u32, 1000);
78cebd08 PM	110	static struct attribute *vexpress_hwmon_attrs_amp[] = {
	111	&dev_attr_curr1_label.attr,
	112	&sensor_dev_attr_curr1_input.dev_attr.attr,
	113	NULL
	114	};
48ed8877	115	static struct attribute_group vexpress_hwmon_group_amp = {
b2e5411e	116	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	117	.attrs = vexpress_hwmon_attrs_amp,
48ed8877 PM	118	};
52feaca5 PM	119	static struct vexpress_hwmon_type vexpress_hwmon_amp = {
	120	.name = "vexpress_amp",
	121	.attr_groups = (const struct attribute_group *[]) {
	122	&vexpress_hwmon_group_amp,
	123	NULL
	124	},
	125	};
48ed8877	126
fa75f745 GR	127	static DEVICE_ATTR(temp1_label, 0444, vexpress_hwmon_label_show, NULL);
fa75f745 GR	128	static SENSOR_DEVICE_ATTR_RO(temp1_input, vexpress_hwmon_u32, 1000);
78cebd08 PM	129	static struct attribute *vexpress_hwmon_attrs_temp[] = {
	130	&dev_attr_temp1_label.attr,
	131	&sensor_dev_attr_temp1_input.dev_attr.attr,
	132	NULL
	133	};
48ed8877	134	static struct attribute_group vexpress_hwmon_group_temp = {
b2e5411e	135	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	136	.attrs = vexpress_hwmon_attrs_temp,
48ed8877 PM	137	};
52feaca5 PM	138	static struct vexpress_hwmon_type vexpress_hwmon_temp = {
	139	.name = "vexpress_temp",
	140	.attr_groups = (const struct attribute_group *[]) {
	141	&vexpress_hwmon_group_temp,
	142	NULL
	143	},
	144	};
48ed8877	145
fa75f745 GR	146	static DEVICE_ATTR(power1_label, 0444, vexpress_hwmon_label_show, NULL);
fa75f745 GR	147	static SENSOR_DEVICE_ATTR_RO(power1_input, vexpress_hwmon_u32, 1);
78cebd08 PM	148	static struct attribute *vexpress_hwmon_attrs_power[] = {
	149	&dev_attr_power1_label.attr,
	150	&sensor_dev_attr_power1_input.dev_attr.attr,
	151	NULL
	152	};
48ed8877	153	static struct attribute_group vexpress_hwmon_group_power = {
b2e5411e	154	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	155	.attrs = vexpress_hwmon_attrs_power,
48ed8877 PM	156	};
52feaca5 PM	157	static struct vexpress_hwmon_type vexpress_hwmon_power = {
	158	.name = "vexpress_power",
	159	.attr_groups = (const struct attribute_group *[]) {
	160	&vexpress_hwmon_group_power,
	161	NULL
	162	},
	163	};
48ed8877	164
fa75f745 GR	165	static DEVICE_ATTR(energy1_label, 0444, vexpress_hwmon_label_show, NULL);
fa75f745 GR	166	static SENSOR_DEVICE_ATTR_RO(energy1_input, vexpress_hwmon_u64, 1);
78cebd08 PM	167	static struct attribute *vexpress_hwmon_attrs_energy[] = {
	168	&dev_attr_energy1_label.attr,
	169	&sensor_dev_attr_energy1_input.dev_attr.attr,
	170	NULL
	171	};
48ed8877	172	static struct attribute_group vexpress_hwmon_group_energy = {
b2e5411e	173	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	174	.attrs = vexpress_hwmon_attrs_energy,
48ed8877 PM	175	};
52feaca5 PM	176	static struct vexpress_hwmon_type vexpress_hwmon_energy = {
	177	.name = "vexpress_energy",
	178	.attr_groups = (const struct attribute_group *[]) {
	179	&vexpress_hwmon_group_energy,
	180	NULL
	181	},
	182	};
48ed8877	183
d720acac	184	static const struct of_device_id vexpress_hwmon_of_match[] = {
48ed8877 PM	185	#if !defined(CONFIG_REGULATOR_VEXPRESS)
	186	{
	187	.compatible = "arm,vexpress-volt",
52feaca5	188	.data = &vexpress_hwmon_volt,
48ed8877 PM	189	},
	190	#endif
	191	{
	192	.compatible = "arm,vexpress-amp",
52feaca5	193	.data = &vexpress_hwmon_amp,
48ed8877 PM	194	}, {
48ed8877 PM	195	.compatible = "arm,vexpress-temp",
52feaca5	196	.data = &vexpress_hwmon_temp,
48ed8877 PM	197	}, {
48ed8877 PM	198	.compatible = "arm,vexpress-power",
52feaca5	199	.data = &vexpress_hwmon_power,
48ed8877 PM	200	}, {
48ed8877 PM	201	.compatible = "arm,vexpress-energy",
52feaca5	202	.data = &vexpress_hwmon_energy,
48ed8877 PM	203	},
	204	{}
	205	};
	206	MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match);
	207
	208	static int vexpress_hwmon_probe(struct platform_device *pdev)
	209	{
48ed8877	210	struct vexpress_hwmon_data *data;
52feaca5	211	const struct vexpress_hwmon_type *type;
48ed8877 PM	212
	213	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	214	if (!data)
	215	return -ENOMEM;
	216	platform_set_drvdata(pdev, data);
	217
92abe504 MCCZ	218	type = of_device_get_match_data(&pdev->dev);
92abe504 MCCZ	219	if (!type)
48ed8877 PM	220	return -ENODEV;
48ed8877 PM	221
3b9334ac PM	222	data->reg = devm_regmap_init_vexpress_config(&pdev->dev);
	223	if (IS_ERR(data->reg))
	224	return PTR_ERR(data->reg);
48ed8877	225
78cebd08 PM	226	data->hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
78cebd08 PM	227	type->name, data, type->attr_groups);
48ed8877	228
78cebd08	229	return PTR_ERR_OR_ZERO(data->hwmon_dev);
48ed8877 PM	230	}
	231
	232	static struct platform_driver vexpress_hwmon_driver = {
	233	.probe = vexpress_hwmon_probe,
48ed8877 PM	234	.driver = {
48ed8877 PM	235	.name = DRVNAME,
48ed8877 PM	236	.of_match_table = vexpress_hwmon_of_match,
	237	},
	238	};
	239
	240	module_platform_driver(vexpress_hwmon_driver);
	241
	242	MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
	243	MODULE_DESCRIPTION("Versatile Express hwmon sensors driver");
	244	MODULE_LICENSE("GPL");
	245	MODULE_ALIAS("platform:vexpress-hwmon");