[linux-2.6-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/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/platform_device.h>
	17	#include <linux/vexpress.h>
	18
	19	struct vexpress_hwmon_data {
	20	struct device *hwmon_dev;
3b9334ac	21	struct regmap *reg;
48ed8877 PM	22	};
48ed8877 PM	23
48ed8877 PM	24	static ssize_t vexpress_hwmon_label_show(struct device *dev,
	25	struct device_attribute dev_attr, char buffer)
	26	{
	27	const char *label = of_get_property(dev->of_node, "label", NULL);
	28
1f4d4af4	29	return sysfs_emit(buffer, "%s\n", label);
48ed8877 PM	30	}
	31
	32	static ssize_t vexpress_hwmon_u32_show(struct device *dev,
	33	struct device_attribute dev_attr, char buffer)
	34	{
	35	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
	36	int err;
	37	u32 value;
	38
3b9334ac	39	err = regmap_read(data->reg, 0, &value);
48ed8877 PM	40	if (err)
	41	return err;
	42
1f4d4af4 GR	43	return sysfs_emit(buffer, "%u\n", value /
1f4d4af4 GR	44	to_sensor_dev_attr(dev_attr)->index);
48ed8877 PM	45	}
	46
	47	static ssize_t vexpress_hwmon_u64_show(struct device *dev,
	48	struct device_attribute dev_attr, char buffer)
	49	{
	50	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
	51	int err;
	52	u32 value_hi, value_lo;
	53
3b9334ac	54	err = regmap_read(data->reg, 0, &value_lo);
48ed8877 PM	55	if (err)
	56	return err;
	57
3b9334ac	58	err = regmap_read(data->reg, 1, &value_hi);
48ed8877 PM	59	if (err)
	60	return err;
	61
1f4d4af4 GR	62	return sysfs_emit(buffer, "%llu\n",
	63	div_u64(((u64)value_hi << 32) \| value_lo,
	64	to_sensor_dev_attr(dev_attr)->index));
48ed8877 PM	65	}
48ed8877 PM	66
b2e5411e PM	67	static umode_t vexpress_hwmon_attr_is_visible(struct kobject *kobj,
	68	struct attribute *attr, int index)
	69	{
	70	struct device *dev = kobj_to_dev(kobj);
	71	struct device_attribute *dev_attr = container_of(attr,
	72	struct device_attribute, attr);
	73
	74	if (dev_attr->show == vexpress_hwmon_label_show &&
	75	!of_get_property(dev->of_node, "label", NULL))
	76	return 0;
	77
	78	return attr->mode;
	79	}
	80
52feaca5 PM	81	struct vexpress_hwmon_type {
	82	const char *name;
	83	const struct attribute_group **attr_groups;
	84	};
	85
48ed8877	86	#if !defined(CONFIG_REGULATOR_VEXPRESS)
fa75f745 GR	87	static DEVICE_ATTR(in1_label, 0444, vexpress_hwmon_label_show, NULL);
fa75f745 GR	88	static SENSOR_DEVICE_ATTR_RO(in1_input, vexpress_hwmon_u32, 1000);
78cebd08 PM	89	static struct attribute *vexpress_hwmon_attrs_volt[] = {
	90	&dev_attr_in1_label.attr,
	91	&sensor_dev_attr_in1_input.dev_attr.attr,
	92	NULL
	93	};
48ed8877	94	static struct attribute_group vexpress_hwmon_group_volt = {
b2e5411e	95	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	96	.attrs = vexpress_hwmon_attrs_volt,
48ed8877 PM	97	};
52feaca5 PM	98	static struct vexpress_hwmon_type vexpress_hwmon_volt = {
	99	.name = "vexpress_volt",
	100	.attr_groups = (const struct attribute_group *[]) {
	101	&vexpress_hwmon_group_volt,
	102	NULL,
	103	},
	104	};
48ed8877 PM	105	#endif
48ed8877 PM	106
fa75f745 GR	107	static DEVICE_ATTR(curr1_label, 0444, vexpress_hwmon_label_show, NULL);
fa75f745 GR	108	static SENSOR_DEVICE_ATTR_RO(curr1_input, vexpress_hwmon_u32, 1000);
78cebd08 PM	109	static struct attribute *vexpress_hwmon_attrs_amp[] = {
	110	&dev_attr_curr1_label.attr,
	111	&sensor_dev_attr_curr1_input.dev_attr.attr,
	112	NULL
	113	};
48ed8877	114	static struct attribute_group vexpress_hwmon_group_amp = {
b2e5411e	115	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	116	.attrs = vexpress_hwmon_attrs_amp,
48ed8877 PM	117	};
52feaca5 PM	118	static struct vexpress_hwmon_type vexpress_hwmon_amp = {
	119	.name = "vexpress_amp",
	120	.attr_groups = (const struct attribute_group *[]) {
	121	&vexpress_hwmon_group_amp,
	122	NULL
	123	},
	124	};
48ed8877	125
fa75f745 GR	126	static DEVICE_ATTR(temp1_label, 0444, vexpress_hwmon_label_show, NULL);
fa75f745 GR	127	static SENSOR_DEVICE_ATTR_RO(temp1_input, vexpress_hwmon_u32, 1000);
78cebd08 PM	128	static struct attribute *vexpress_hwmon_attrs_temp[] = {
	129	&dev_attr_temp1_label.attr,
	130	&sensor_dev_attr_temp1_input.dev_attr.attr,
	131	NULL
	132	};
48ed8877	133	static struct attribute_group vexpress_hwmon_group_temp = {
b2e5411e	134	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	135	.attrs = vexpress_hwmon_attrs_temp,
48ed8877 PM	136	};
52feaca5 PM	137	static struct vexpress_hwmon_type vexpress_hwmon_temp = {
	138	.name = "vexpress_temp",
	139	.attr_groups = (const struct attribute_group *[]) {
	140	&vexpress_hwmon_group_temp,
	141	NULL
	142	},
	143	};
48ed8877	144
fa75f745 GR	145	static DEVICE_ATTR(power1_label, 0444, vexpress_hwmon_label_show, NULL);
fa75f745 GR	146	static SENSOR_DEVICE_ATTR_RO(power1_input, vexpress_hwmon_u32, 1);
78cebd08 PM	147	static struct attribute *vexpress_hwmon_attrs_power[] = {
	148	&dev_attr_power1_label.attr,
	149	&sensor_dev_attr_power1_input.dev_attr.attr,
	150	NULL
	151	};
48ed8877	152	static struct attribute_group vexpress_hwmon_group_power = {
b2e5411e	153	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	154	.attrs = vexpress_hwmon_attrs_power,
48ed8877 PM	155	};
52feaca5 PM	156	static struct vexpress_hwmon_type vexpress_hwmon_power = {
	157	.name = "vexpress_power",
	158	.attr_groups = (const struct attribute_group *[]) {
	159	&vexpress_hwmon_group_power,
	160	NULL
	161	},
	162	};
48ed8877	163
fa75f745 GR	164	static DEVICE_ATTR(energy1_label, 0444, vexpress_hwmon_label_show, NULL);
fa75f745 GR	165	static SENSOR_DEVICE_ATTR_RO(energy1_input, vexpress_hwmon_u64, 1);
78cebd08 PM	166	static struct attribute *vexpress_hwmon_attrs_energy[] = {
	167	&dev_attr_energy1_label.attr,
	168	&sensor_dev_attr_energy1_input.dev_attr.attr,
	169	NULL
	170	};
48ed8877	171	static struct attribute_group vexpress_hwmon_group_energy = {
b2e5411e	172	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	173	.attrs = vexpress_hwmon_attrs_energy,
48ed8877 PM	174	};
52feaca5 PM	175	static struct vexpress_hwmon_type vexpress_hwmon_energy = {
	176	.name = "vexpress_energy",
	177	.attr_groups = (const struct attribute_group *[]) {
	178	&vexpress_hwmon_group_energy,
	179	NULL
	180	},
	181	};
48ed8877	182
d720acac	183	static const struct of_device_id vexpress_hwmon_of_match[] = {
48ed8877 PM	184	#if !defined(CONFIG_REGULATOR_VEXPRESS)
	185	{
	186	.compatible = "arm,vexpress-volt",
52feaca5	187	.data = &vexpress_hwmon_volt,
48ed8877 PM	188	},
	189	#endif
	190	{
	191	.compatible = "arm,vexpress-amp",
52feaca5	192	.data = &vexpress_hwmon_amp,
48ed8877 PM	193	}, {
48ed8877 PM	194	.compatible = "arm,vexpress-temp",
52feaca5	195	.data = &vexpress_hwmon_temp,
48ed8877 PM	196	}, {
48ed8877 PM	197	.compatible = "arm,vexpress-power",
52feaca5	198	.data = &vexpress_hwmon_power,
48ed8877 PM	199	}, {
48ed8877 PM	200	.compatible = "arm,vexpress-energy",
52feaca5	201	.data = &vexpress_hwmon_energy,
48ed8877 PM	202	},
	203	{}
	204	};
	205	MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match);
	206
	207	static int vexpress_hwmon_probe(struct platform_device *pdev)
	208	{
48ed8877	209	struct vexpress_hwmon_data *data;
52feaca5	210	const struct vexpress_hwmon_type *type;
48ed8877 PM	211
	212	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	213	if (!data)
	214	return -ENOMEM;
	215	platform_set_drvdata(pdev, data);
	216
92abe504 MCCZ	217	type = of_device_get_match_data(&pdev->dev);
92abe504 MCCZ	218	if (!type)
48ed8877 PM	219	return -ENODEV;
48ed8877 PM	220
3b9334ac PM	221	data->reg = devm_regmap_init_vexpress_config(&pdev->dev);
	222	if (IS_ERR(data->reg))
	223	return PTR_ERR(data->reg);
48ed8877	224
78cebd08 PM	225	data->hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
78cebd08 PM	226	type->name, data, type->attr_groups);
48ed8877	227
78cebd08	228	return PTR_ERR_OR_ZERO(data->hwmon_dev);
48ed8877 PM	229	}
	230
	231	static struct platform_driver vexpress_hwmon_driver = {
	232	.probe = vexpress_hwmon_probe,
48ed8877 PM	233	.driver = {
48ed8877 PM	234	.name = DRVNAME,
48ed8877 PM	235	.of_match_table = vexpress_hwmon_of_match,
	236	},
	237	};
	238
	239	module_platform_driver(vexpress_hwmon_driver);
	240
	241	MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
	242	MODULE_DESCRIPTION("Versatile Express hwmon sensors driver");
	243	MODULE_LICENSE("GPL");
	244	MODULE_ALIAS("platform:vexpress-hwmon");