[mirror_ubuntu-zesty-kernel.git] / drivers / hwmon / vexpress.c

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * 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 snprintf(buffer, PAGE_SIZE, "%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 snprintf(buffer, PAGE_SIZE, "%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 snprintf(buffer, PAGE_SIZE, "%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, S_IRUGO, vexpress_hwmon_label_show, NULL);
static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, vexpress_hwmon_u32_show,
		NULL, 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, S_IRUGO, vexpress_hwmon_label_show, NULL);
static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, vexpress_hwmon_u32_show,
		NULL, 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, S_IRUGO, vexpress_hwmon_label_show, NULL);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, vexpress_hwmon_u32_show,
		NULL, 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, S_IRUGO, vexpress_hwmon_label_show, NULL);
static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, vexpress_hwmon_u32_show,
		NULL, 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, S_IRUGO, vexpress_hwmon_label_show, NULL);
static SENSOR_DEVICE_ATTR(energy1_input, S_IRUGO, vexpress_hwmon_u64_show,
		NULL, 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)
{
	const struct of_device_id *match;
	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);

	match = of_match_device(vexpress_hwmon_of_match, &pdev->dev);
	if (!match)
		return -ENODEV;
	type = match->data;

	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
48ed8877 PM	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License version 2 as
	4	* published by the Free Software Foundation.
	5	*
	6	* This program is distributed in the hope that it will be useful,
	7	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	8	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	9	* GNU General Public License for more details.
	10	*
	11	* Copyright (C) 2012 ARM Limited
	12	*/
	13
	14	#define DRVNAME "vexpress-hwmon"
	15	#define pr_fmt(fmt) DRVNAME ": " fmt
	16
	17	#include <linux/device.h>
	18	#include <linux/err.h>
	19	#include <linux/hwmon.h>
	20	#include <linux/hwmon-sysfs.h>
	21	#include <linux/module.h>
08245ad8	22	#include <linux/of.h>
48ed8877 PM	23	#include <linux/of_device.h>
	24	#include <linux/platform_device.h>
	25	#include <linux/vexpress.h>
	26
	27	struct vexpress_hwmon_data {
	28	struct device *hwmon_dev;
3b9334ac	29	struct regmap *reg;
48ed8877 PM	30	};
48ed8877 PM	31
48ed8877 PM	32	static ssize_t vexpress_hwmon_label_show(struct device *dev,
	33	struct device_attribute dev_attr, char buffer)
	34	{
	35	const char *label = of_get_property(dev->of_node, "label", NULL);
	36
48ed8877 PM	37	return snprintf(buffer, PAGE_SIZE, "%s\n", label);
	38	}
	39
	40	static ssize_t vexpress_hwmon_u32_show(struct device *dev,
	41	struct device_attribute dev_attr, char buffer)
	42	{
	43	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
	44	int err;
	45	u32 value;
	46
3b9334ac	47	err = regmap_read(data->reg, 0, &value);
48ed8877 PM	48	if (err)
	49	return err;
	50
	51	return snprintf(buffer, PAGE_SIZE, "%u\n", value /
	52	to_sensor_dev_attr(dev_attr)->index);
	53	}
	54
	55	static ssize_t vexpress_hwmon_u64_show(struct device *dev,
	56	struct device_attribute dev_attr, char buffer)
	57	{
	58	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
	59	int err;
	60	u32 value_hi, value_lo;
	61
3b9334ac	62	err = regmap_read(data->reg, 0, &value_lo);
48ed8877 PM	63	if (err)
	64	return err;
	65
3b9334ac	66	err = regmap_read(data->reg, 1, &value_hi);
48ed8877 PM	67	if (err)
	68	return err;
	69
	70	return snprintf(buffer, PAGE_SIZE, "%llu\n",
	71	div_u64(((u64)value_hi << 32) \| value_lo,
	72	to_sensor_dev_attr(dev_attr)->index));
	73	}
	74
b2e5411e PM	75	static umode_t vexpress_hwmon_attr_is_visible(struct kobject *kobj,
	76	struct attribute *attr, int index)
	77	{
	78	struct device *dev = kobj_to_dev(kobj);
	79	struct device_attribute *dev_attr = container_of(attr,
	80	struct device_attribute, attr);
	81
	82	if (dev_attr->show == vexpress_hwmon_label_show &&
	83	!of_get_property(dev->of_node, "label", NULL))
	84	return 0;
	85
	86	return attr->mode;
	87	}
	88
52feaca5 PM	89	struct vexpress_hwmon_type {
	90	const char *name;
	91	const struct attribute_group **attr_groups;
	92	};
	93
48ed8877 PM	94	#if !defined(CONFIG_REGULATOR_VEXPRESS)
	95	static DEVICE_ATTR(in1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
	96	static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, vexpress_hwmon_u32_show,
	97	NULL, 1000);
78cebd08 PM	98	static struct attribute *vexpress_hwmon_attrs_volt[] = {
	99	&dev_attr_in1_label.attr,
	100	&sensor_dev_attr_in1_input.dev_attr.attr,
	101	NULL
	102	};
48ed8877	103	static struct attribute_group vexpress_hwmon_group_volt = {
b2e5411e	104	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	105	.attrs = vexpress_hwmon_attrs_volt,
48ed8877 PM	106	};
52feaca5 PM	107	static struct vexpress_hwmon_type vexpress_hwmon_volt = {
	108	.name = "vexpress_volt",
	109	.attr_groups = (const struct attribute_group *[]) {
	110	&vexpress_hwmon_group_volt,
	111	NULL,
	112	},
	113	};
48ed8877 PM	114	#endif
	115
	116	static DEVICE_ATTR(curr1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
	117	static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, vexpress_hwmon_u32_show,
	118	NULL, 1000);
78cebd08 PM	119	static struct attribute *vexpress_hwmon_attrs_amp[] = {
	120	&dev_attr_curr1_label.attr,
	121	&sensor_dev_attr_curr1_input.dev_attr.attr,
	122	NULL
	123	};
48ed8877	124	static struct attribute_group vexpress_hwmon_group_amp = {
b2e5411e	125	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	126	.attrs = vexpress_hwmon_attrs_amp,
48ed8877 PM	127	};
52feaca5 PM	128	static struct vexpress_hwmon_type vexpress_hwmon_amp = {
	129	.name = "vexpress_amp",
	130	.attr_groups = (const struct attribute_group *[]) {
	131	&vexpress_hwmon_group_amp,
	132	NULL
	133	},
	134	};
48ed8877 PM	135
	136	static DEVICE_ATTR(temp1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
	137	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, vexpress_hwmon_u32_show,
	138	NULL, 1000);
78cebd08 PM	139	static struct attribute *vexpress_hwmon_attrs_temp[] = {
	140	&dev_attr_temp1_label.attr,
	141	&sensor_dev_attr_temp1_input.dev_attr.attr,
	142	NULL
	143	};
48ed8877	144	static struct attribute_group vexpress_hwmon_group_temp = {
b2e5411e	145	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	146	.attrs = vexpress_hwmon_attrs_temp,
48ed8877 PM	147	};
52feaca5 PM	148	static struct vexpress_hwmon_type vexpress_hwmon_temp = {
	149	.name = "vexpress_temp",
	150	.attr_groups = (const struct attribute_group *[]) {
	151	&vexpress_hwmon_group_temp,
	152	NULL
	153	},
	154	};
48ed8877 PM	155
	156	static DEVICE_ATTR(power1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
	157	static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, vexpress_hwmon_u32_show,
	158	NULL, 1);
78cebd08 PM	159	static struct attribute *vexpress_hwmon_attrs_power[] = {
	160	&dev_attr_power1_label.attr,
	161	&sensor_dev_attr_power1_input.dev_attr.attr,
	162	NULL
	163	};
48ed8877	164	static struct attribute_group vexpress_hwmon_group_power = {
b2e5411e	165	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	166	.attrs = vexpress_hwmon_attrs_power,
48ed8877 PM	167	};
52feaca5 PM	168	static struct vexpress_hwmon_type vexpress_hwmon_power = {
	169	.name = "vexpress_power",
	170	.attr_groups = (const struct attribute_group *[]) {
	171	&vexpress_hwmon_group_power,
	172	NULL
	173	},
	174	};
48ed8877 PM	175
	176	static DEVICE_ATTR(energy1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
	177	static SENSOR_DEVICE_ATTR(energy1_input, S_IRUGO, vexpress_hwmon_u64_show,
	178	NULL, 1);
78cebd08 PM	179	static struct attribute *vexpress_hwmon_attrs_energy[] = {
	180	&dev_attr_energy1_label.attr,
	181	&sensor_dev_attr_energy1_input.dev_attr.attr,
	182	NULL
	183	};
48ed8877	184	static struct attribute_group vexpress_hwmon_group_energy = {
b2e5411e	185	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	186	.attrs = vexpress_hwmon_attrs_energy,
48ed8877 PM	187	};
52feaca5 PM	188	static struct vexpress_hwmon_type vexpress_hwmon_energy = {
	189	.name = "vexpress_energy",
	190	.attr_groups = (const struct attribute_group *[]) {
	191	&vexpress_hwmon_group_energy,
	192	NULL
	193	},
	194	};
48ed8877	195
d720acac	196	static const struct of_device_id vexpress_hwmon_of_match[] = {
48ed8877 PM	197	#if !defined(CONFIG_REGULATOR_VEXPRESS)
	198	{
	199	.compatible = "arm,vexpress-volt",
52feaca5	200	.data = &vexpress_hwmon_volt,
48ed8877 PM	201	},
	202	#endif
	203	{
	204	.compatible = "arm,vexpress-amp",
52feaca5	205	.data = &vexpress_hwmon_amp,
48ed8877 PM	206	}, {
48ed8877 PM	207	.compatible = "arm,vexpress-temp",
52feaca5	208	.data = &vexpress_hwmon_temp,
48ed8877 PM	209	}, {
48ed8877 PM	210	.compatible = "arm,vexpress-power",
52feaca5	211	.data = &vexpress_hwmon_power,
48ed8877 PM	212	}, {
48ed8877 PM	213	.compatible = "arm,vexpress-energy",
52feaca5	214	.data = &vexpress_hwmon_energy,
48ed8877 PM	215	},
	216	{}
	217	};
	218	MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match);
	219
	220	static int vexpress_hwmon_probe(struct platform_device *pdev)
	221	{
48ed8877 PM	222	const struct of_device_id *match;
48ed8877 PM	223	struct vexpress_hwmon_data *data;
52feaca5	224	const struct vexpress_hwmon_type *type;
48ed8877 PM	225
	226	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	227	if (!data)
	228	return -ENOMEM;
	229	platform_set_drvdata(pdev, data);
	230
	231	match = of_match_device(vexpress_hwmon_of_match, &pdev->dev);
	232	if (!match)
	233	return -ENODEV;
52feaca5	234	type = match->data;
48ed8877	235
3b9334ac PM	236	data->reg = devm_regmap_init_vexpress_config(&pdev->dev);
	237	if (IS_ERR(data->reg))
	238	return PTR_ERR(data->reg);
48ed8877	239
78cebd08 PM	240	data->hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
78cebd08 PM	241	type->name, data, type->attr_groups);
48ed8877	242
78cebd08	243	return PTR_ERR_OR_ZERO(data->hwmon_dev);
48ed8877 PM	244	}
	245
	246	static struct platform_driver vexpress_hwmon_driver = {
	247	.probe = vexpress_hwmon_probe,
48ed8877 PM	248	.driver = {
48ed8877 PM	249	.name = DRVNAME,
48ed8877 PM	250	.of_match_table = vexpress_hwmon_of_match,
	251	},
	252	};
	253
	254	module_platform_driver(vexpress_hwmon_driver);
	255
	256	MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
	257	MODULE_DESCRIPTION("Versatile Express hwmon sensors driver");
	258	MODULE_LICENSE("GPL");
	259	MODULE_ALIAS("platform:vexpress-hwmon");