[deliverable/linux.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;
	const char *name;
};

static ssize_t vexpress_hwmon_name_show(struct device *dev,
		struct device_attribute *dev_attr, char *buffer)
{
	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);

	return sprintf(buffer, "%s\n", data->name);
}

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;
}

static DEVICE_ATTR(name, S_IRUGO, vexpress_hwmon_name_show, NULL);

#define VEXPRESS_HWMON_ATTRS(_name, _label_attr, _input_attr)	\
struct attribute *vexpress_hwmon_attrs_##_name[] = {		\
	&dev_attr_name.attr,					\
	&dev_attr_##_label_attr.attr,				\
	&sensor_dev_attr_##_input_attr.dev_attr.attr,		\
	NULL							\
}

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 VEXPRESS_HWMON_ATTRS(volt, in1_label, in1_input);
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 VEXPRESS_HWMON_ATTRS(amp, curr1_label, curr1_input);
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 VEXPRESS_HWMON_ATTRS(temp, temp1_label, temp1_input);
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 VEXPRESS_HWMON_ATTRS(power, power1_label, power1_input);
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 VEXPRESS_HWMON_ATTRS(energy, energy1_label, energy1_input);
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 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)
{
	int err;
	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->name = type->name;

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

	err = sysfs_create_groups(&pdev->dev.kobj, type->attr_groups);
	if (err)
		goto error;

	data->hwmon_dev = hwmon_device_register(&pdev->dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto error;
	}

	return 0;

error:
	sysfs_remove_group(&pdev->dev.kobj, match->data);
	return err;
}

static int vexpress_hwmon_remove(struct platform_device *pdev)
{
	struct vexpress_hwmon_data *data = platform_get_drvdata(pdev);
	const struct of_device_id *match;

	hwmon_device_unregister(data->hwmon_dev);

	match = of_match_device(vexpress_hwmon_of_match, &pdev->dev);
	sysfs_remove_group(&pdev->dev.kobj, match->data);

	return 0;
}

static struct platform_driver vexpress_hwmon_driver = {
	.probe = vexpress_hwmon_probe,
	.remove = vexpress_hwmon_remove,
	.driver	= {
		.name = DRVNAME,
		.owner = THIS_MODULE,
		.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;
52feaca5	30	const char *name;
48ed8877 PM	31	};
	32
	33	static ssize_t vexpress_hwmon_name_show(struct device *dev,
	34	struct device_attribute dev_attr, char buffer)
	35	{
52feaca5	36	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
48ed8877	37
52feaca5	38	return sprintf(buffer, "%s\n", data->name);
48ed8877 PM	39	}
	40
	41	static ssize_t vexpress_hwmon_label_show(struct device *dev,
	42	struct device_attribute dev_attr, char buffer)
	43	{
	44	const char *label = of_get_property(dev->of_node, "label", NULL);
	45
48ed8877 PM	46	return snprintf(buffer, PAGE_SIZE, "%s\n", label);
	47	}
	48
	49	static ssize_t vexpress_hwmon_u32_show(struct device *dev,
	50	struct device_attribute dev_attr, char buffer)
	51	{
	52	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
	53	int err;
	54	u32 value;
	55
3b9334ac	56	err = regmap_read(data->reg, 0, &value);
48ed8877 PM	57	if (err)
	58	return err;
	59
	60	return snprintf(buffer, PAGE_SIZE, "%u\n", value /
	61	to_sensor_dev_attr(dev_attr)->index);
	62	}
	63
	64	static ssize_t vexpress_hwmon_u64_show(struct device *dev,
	65	struct device_attribute dev_attr, char buffer)
	66	{
	67	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
	68	int err;
	69	u32 value_hi, value_lo;
	70
3b9334ac	71	err = regmap_read(data->reg, 0, &value_lo);
48ed8877 PM	72	if (err)
	73	return err;
	74
3b9334ac	75	err = regmap_read(data->reg, 1, &value_hi);
48ed8877 PM	76	if (err)
	77	return err;
	78
	79	return snprintf(buffer, PAGE_SIZE, "%llu\n",
	80	div_u64(((u64)value_hi << 32) \| value_lo,
	81	to_sensor_dev_attr(dev_attr)->index));
	82	}
	83
b2e5411e PM	84	static umode_t vexpress_hwmon_attr_is_visible(struct kobject *kobj,
	85	struct attribute *attr, int index)
	86	{
	87	struct device *dev = kobj_to_dev(kobj);
	88	struct device_attribute *dev_attr = container_of(attr,
	89	struct device_attribute, attr);
	90
	91	if (dev_attr->show == vexpress_hwmon_label_show &&
	92	!of_get_property(dev->of_node, "label", NULL))
	93	return 0;
	94
	95	return attr->mode;
	96	}
	97
48ed8877 PM	98	static DEVICE_ATTR(name, S_IRUGO, vexpress_hwmon_name_show, NULL);
	99
	100	#define VEXPRESS_HWMON_ATTRS(_name, _label_attr, _input_attr) \
	101	struct attribute *vexpress_hwmon_attrs_##_name[] = { \
	102	&dev_attr_name.attr, \
	103	&dev_attr_##_label_attr.attr, \
	104	&sensor_dev_attr_##_input_attr.dev_attr.attr, \
	105	NULL \
	106	}
	107
52feaca5 PM	108	struct vexpress_hwmon_type {
	109	const char *name;
	110	const struct attribute_group **attr_groups;
	111	};
	112
48ed8877 PM	113	#if !defined(CONFIG_REGULATOR_VEXPRESS)
	114	static DEVICE_ATTR(in1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
	115	static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, vexpress_hwmon_u32_show,
	116	NULL, 1000);
	117	static VEXPRESS_HWMON_ATTRS(volt, in1_label, in1_input);
	118	static struct attribute_group vexpress_hwmon_group_volt = {
b2e5411e	119	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	120	.attrs = vexpress_hwmon_attrs_volt,
48ed8877 PM	121	};
52feaca5 PM	122	static struct vexpress_hwmon_type vexpress_hwmon_volt = {
	123	.name = "vexpress_volt",
	124	.attr_groups = (const struct attribute_group *[]) {
	125	&vexpress_hwmon_group_volt,
	126	NULL,
	127	},
	128	};
48ed8877 PM	129	#endif
	130
	131	static DEVICE_ATTR(curr1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
	132	static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, vexpress_hwmon_u32_show,
	133	NULL, 1000);
	134	static VEXPRESS_HWMON_ATTRS(amp, curr1_label, curr1_input);
	135	static struct attribute_group vexpress_hwmon_group_amp = {
b2e5411e	136	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	137	.attrs = vexpress_hwmon_attrs_amp,
48ed8877 PM	138	};
52feaca5 PM	139	static struct vexpress_hwmon_type vexpress_hwmon_amp = {
	140	.name = "vexpress_amp",
	141	.attr_groups = (const struct attribute_group *[]) {
	142	&vexpress_hwmon_group_amp,
	143	NULL
	144	},
	145	};
48ed8877 PM	146
	147	static DEVICE_ATTR(temp1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
	148	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, vexpress_hwmon_u32_show,
	149	NULL, 1000);
	150	static VEXPRESS_HWMON_ATTRS(temp, temp1_label, temp1_input);
	151	static struct attribute_group vexpress_hwmon_group_temp = {
b2e5411e	152	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	153	.attrs = vexpress_hwmon_attrs_temp,
48ed8877 PM	154	};
52feaca5 PM	155	static struct vexpress_hwmon_type vexpress_hwmon_temp = {
	156	.name = "vexpress_temp",
	157	.attr_groups = (const struct attribute_group *[]) {
	158	&vexpress_hwmon_group_temp,
	159	NULL
	160	},
	161	};
48ed8877 PM	162
	163	static DEVICE_ATTR(power1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
	164	static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, vexpress_hwmon_u32_show,
	165	NULL, 1);
	166	static VEXPRESS_HWMON_ATTRS(power, power1_label, power1_input);
	167	static struct attribute_group vexpress_hwmon_group_power = {
b2e5411e	168	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	169	.attrs = vexpress_hwmon_attrs_power,
48ed8877 PM	170	};
52feaca5 PM	171	static struct vexpress_hwmon_type vexpress_hwmon_power = {
	172	.name = "vexpress_power",
	173	.attr_groups = (const struct attribute_group *[]) {
	174	&vexpress_hwmon_group_power,
	175	NULL
	176	},
	177	};
48ed8877 PM	178
	179	static DEVICE_ATTR(energy1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
	180	static SENSOR_DEVICE_ATTR(energy1_input, S_IRUGO, vexpress_hwmon_u64_show,
	181	NULL, 1);
	182	static VEXPRESS_HWMON_ATTRS(energy, energy1_label, energy1_input);
	183	static struct attribute_group vexpress_hwmon_group_energy = {
b2e5411e	184	.is_visible = vexpress_hwmon_attr_is_visible,
48ed8877 PM	185	.attrs = vexpress_hwmon_attrs_energy,
48ed8877 PM	186	};
52feaca5 PM	187	static struct vexpress_hwmon_type vexpress_hwmon_energy = {
	188	.name = "vexpress_energy",
	189	.attr_groups = (const struct attribute_group *[]) {
	190	&vexpress_hwmon_group_energy,
	191	NULL
	192	},
	193	};
48ed8877 PM	194
	195	static struct of_device_id vexpress_hwmon_of_match[] = {
	196	#if !defined(CONFIG_REGULATOR_VEXPRESS)
	197	{
	198	.compatible = "arm,vexpress-volt",
52feaca5	199	.data = &vexpress_hwmon_volt,
48ed8877 PM	200	},
	201	#endif
	202	{
	203	.compatible = "arm,vexpress-amp",
52feaca5	204	.data = &vexpress_hwmon_amp,
48ed8877 PM	205	}, {
48ed8877 PM	206	.compatible = "arm,vexpress-temp",
52feaca5	207	.data = &vexpress_hwmon_temp,
48ed8877 PM	208	}, {
48ed8877 PM	209	.compatible = "arm,vexpress-power",
52feaca5	210	.data = &vexpress_hwmon_power,
48ed8877 PM	211	}, {
48ed8877 PM	212	.compatible = "arm,vexpress-energy",
52feaca5	213	.data = &vexpress_hwmon_energy,
48ed8877 PM	214	},
	215	{}
	216	};
	217	MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match);
	218
	219	static int vexpress_hwmon_probe(struct platform_device *pdev)
	220	{
	221	int err;
	222	const struct of_device_id *match;
	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 PM	234	type = match->data;
52feaca5 PM	235	data->name = type->name;
48ed8877	236
3b9334ac PM	237	data->reg = devm_regmap_init_vexpress_config(&pdev->dev);
	238	if (IS_ERR(data->reg))
	239	return PTR_ERR(data->reg);
48ed8877	240
52feaca5	241	err = sysfs_create_groups(&pdev->dev.kobj, type->attr_groups);
48ed8877 PM	242	if (err)
	243	goto error;
	244
	245	data->hwmon_dev = hwmon_device_register(&pdev->dev);
	246	if (IS_ERR(data->hwmon_dev)) {
	247	err = PTR_ERR(data->hwmon_dev);
	248	goto error;
	249	}
	250
	251	return 0;
	252
	253	error:
	254	sysfs_remove_group(&pdev->dev.kobj, match->data);
48ed8877 PM	255	return err;
	256	}
	257
0fe763c5	258	static int vexpress_hwmon_remove(struct platform_device *pdev)
48ed8877 PM	259	{
	260	struct vexpress_hwmon_data *data = platform_get_drvdata(pdev);
	261	const struct of_device_id *match;
	262
	263	hwmon_device_unregister(data->hwmon_dev);
	264
	265	match = of_match_device(vexpress_hwmon_of_match, &pdev->dev);
	266	sysfs_remove_group(&pdev->dev.kobj, match->data);
	267
48ed8877 PM	268	return 0;
	269	}
	270
	271	static struct platform_driver vexpress_hwmon_driver = {
	272	.probe = vexpress_hwmon_probe,
0fe763c5	273	.remove = vexpress_hwmon_remove,
48ed8877 PM	274	.driver = {
	275	.name = DRVNAME,
	276	.owner = THIS_MODULE,
	277	.of_match_table = vexpress_hwmon_of_match,
	278	},
	279	};
	280
	281	module_platform_driver(vexpress_hwmon_driver);
	282
	283	MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
	284	MODULE_DESCRIPTION("Versatile Express hwmon sensors driver");
	285	MODULE_LICENSE("GPL");
	286	MODULE_ALIAS("platform:vexpress-hwmon");