[GitHub/mt8127/android_kernel_alcatel_ttab.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 vexpress_config_func *func;
};

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

	return sprintf(buffer, "%s\n", compatible);
}

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);

	if (!label)
		return -ENOENT;

	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 = vexpress_config_read(data->func, 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 = vexpress_config_read(data->func, 0, &value_lo);
	if (err)
		return err;

	err = vexpress_config_read(data->func, 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 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							\
}

#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 = {
	.attrs = vexpress_hwmon_attrs_volt,
};
#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 = {
	.attrs = vexpress_hwmon_attrs_amp,
};

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 = {
	.attrs = vexpress_hwmon_attrs_temp,
};

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 = {
	.attrs = vexpress_hwmon_attrs_power,
};

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 = {
	.attrs = vexpress_hwmon_attrs_energy,
};

static struct of_device_id vexpress_hwmon_of_match[] = {
#if !defined(CONFIG_REGULATOR_VEXPRESS)
	{
		.compatible = "arm,vexpress-volt",
		.data = &vexpress_hwmon_group_volt,
	},
#endif
	{
		.compatible = "arm,vexpress-amp",
		.data = &vexpress_hwmon_group_amp,
	}, {
		.compatible = "arm,vexpress-temp",
		.data = &vexpress_hwmon_group_temp,
	}, {
		.compatible = "arm,vexpress-power",
		.data = &vexpress_hwmon_group_power,
	}, {
		.compatible = "arm,vexpress-energy",
		.data = &vexpress_hwmon_group_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;

	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;

	data->func = vexpress_config_func_get_by_dev(&pdev->dev);
	if (!data->func)
		return -ENODEV;

	err = sysfs_create_group(&pdev->dev.kobj, match->data);
	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);
	vexpress_config_func_put(data->func);
	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);

	vexpress_config_func_put(data->func);

	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;
	29	struct vexpress_config_func *func;
	30	};
	31
	32	static ssize_t vexpress_hwmon_name_show(struct device *dev,
	33	struct device_attribute dev_attr, char buffer)
	34	{
	35	const char *compatible = of_get_property(dev->of_node, "compatible",
	36	NULL);
	37
	38	return sprintf(buffer, "%s\n", compatible);
	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
	46	if (!label)
	47	return -ENOENT;
	48
	49	return snprintf(buffer, PAGE_SIZE, "%s\n", label);
	50	}
	51
	52	static ssize_t vexpress_hwmon_u32_show(struct device *dev,
	53	struct device_attribute dev_attr, char buffer)
	54	{
	55	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
	56	int err;
	57	u32 value;
	58
	59	err = vexpress_config_read(data->func, 0, &value);
	60	if (err)
	61	return err;
	62
	63	return snprintf(buffer, PAGE_SIZE, "%u\n", value /
	64	to_sensor_dev_attr(dev_attr)->index);
	65	}
	66
	67	static ssize_t vexpress_hwmon_u64_show(struct device *dev,
	68	struct device_attribute dev_attr, char buffer)
	69	{
	70	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
	71	int err;
	72	u32 value_hi, value_lo;
	73
	74	err = vexpress_config_read(data->func, 0, &value_lo);
	75	if (err)
	76	return err;
	77
	78	err = vexpress_config_read(data->func, 1, &value_hi);
	79	if (err)
	80	return err;
	81
	82	return snprintf(buffer, PAGE_SIZE, "%llu\n",
	83	div_u64(((u64)value_hi << 32) \| value_lo,
	84	to_sensor_dev_attr(dev_attr)->index));
	85	}
	86
87	static DEVICE_ATTR(name, S_IRUGO, vexpress_hwmon_name_show, NULL);
88
89	#define VEXPRESS_HWMON_ATTRS(_name, _label_attr, _input_attr) \
90	struct attribute *vexpress_hwmon_attrs_##_name[] = { \
91	&dev_attr_name.attr, \
92	&dev_attr_##_label_attr.attr, \
93	&sensor_dev_attr_##_input_attr.dev_attr.attr, \
94	NULL \
95	}
96
97	#if !defined(CONFIG_REGULATOR_VEXPRESS)
98	static DEVICE_ATTR(in1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
99	static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, vexpress_hwmon_u32_show,
100	NULL, 1000);
101	static VEXPRESS_HWMON_ATTRS(volt, in1_label, in1_input);
102	static struct attribute_group vexpress_hwmon_group_volt = {
103	.attrs = vexpress_hwmon_attrs_volt,
104	};
105	#endif
106
107	static DEVICE_ATTR(curr1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
108	static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, vexpress_hwmon_u32_show,
109	NULL, 1000);
110	static VEXPRESS_HWMON_ATTRS(amp, curr1_label, curr1_input);
111	static struct attribute_group vexpress_hwmon_group_amp = {
112	.attrs = vexpress_hwmon_attrs_amp,
113	};
114
115	static DEVICE_ATTR(temp1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
116	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, vexpress_hwmon_u32_show,
117	NULL, 1000);
118	static VEXPRESS_HWMON_ATTRS(temp, temp1_label, temp1_input);
119	static struct attribute_group vexpress_hwmon_group_temp = {
120	.attrs = vexpress_hwmon_attrs_temp,
121	};
122
123	static DEVICE_ATTR(power1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
124	static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, vexpress_hwmon_u32_show,
125	NULL, 1);
126	static VEXPRESS_HWMON_ATTRS(power, power1_label, power1_input);
127	static struct attribute_group vexpress_hwmon_group_power = {
128	.attrs = vexpress_hwmon_attrs_power,
129	};
130
131	static DEVICE_ATTR(energy1_label, S_IRUGO, vexpress_hwmon_label_show, NULL);
132	static SENSOR_DEVICE_ATTR(energy1_input, S_IRUGO, vexpress_hwmon_u64_show,
133	NULL, 1);
134	static VEXPRESS_HWMON_ATTRS(energy, energy1_label, energy1_input);
135	static struct attribute_group vexpress_hwmon_group_energy = {
136	.attrs = vexpress_hwmon_attrs_energy,
137	};
138
139	static struct of_device_id vexpress_hwmon_of_match[] = {
140	#if !defined(CONFIG_REGULATOR_VEXPRESS)
141	{
142	.compatible = "arm,vexpress-volt",
143	.data = &vexpress_hwmon_group_volt,
144	},
145	#endif
146	{
147	.compatible = "arm,vexpress-amp",
148	.data = &vexpress_hwmon_group_amp,
149	}, {
150	.compatible = "arm,vexpress-temp",
151	.data = &vexpress_hwmon_group_temp,
152	}, {
153	.compatible = "arm,vexpress-power",
154	.data = &vexpress_hwmon_group_power,
155	}, {
156	.compatible = "arm,vexpress-energy",
157	.data = &vexpress_hwmon_group_energy,
158	},
159	{}
160	};
161	MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match);
162
163	static int vexpress_hwmon_probe(struct platform_device *pdev)
164	{
165	int err;
166	const struct of_device_id *match;
167	struct vexpress_hwmon_data *data;
168
169	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
170	if (!data)
171	return -ENOMEM;
172	platform_set_drvdata(pdev, data);
173
174	match = of_match_device(vexpress_hwmon_of_match, &pdev->dev);
175	if (!match)
176	return -ENODEV;
177
178	data->func = vexpress_config_func_get_by_dev(&pdev->dev);
179	if (!data->func)
180	return -ENODEV;
181
182	err = sysfs_create_group(&pdev->dev.kobj, match->data);
183	if (err)
184	goto error;
185
186	data->hwmon_dev = hwmon_device_register(&pdev->dev);
187	if (IS_ERR(data->hwmon_dev)) {
188	err = PTR_ERR(data->hwmon_dev);
189	goto error;
190	}
191
192	return 0;
193
194	error:
195	sysfs_remove_group(&pdev->dev.kobj, match->data);
196	vexpress_config_func_put(data->func);
197	return err;
198	}
199
0fe763c5	200	static int vexpress_hwmon_remove(struct platform_device *pdev)
48ed8877 PM	201	{
	202	struct vexpress_hwmon_data *data = platform_get_drvdata(pdev);
	203	const struct of_device_id *match;
	204
	205	hwmon_device_unregister(data->hwmon_dev);
	206
	207	match = of_match_device(vexpress_hwmon_of_match, &pdev->dev);
	208	sysfs_remove_group(&pdev->dev.kobj, match->data);
	209
	210	vexpress_config_func_put(data->func);
	211
	212	return 0;
	213	}
	214
	215	static struct platform_driver vexpress_hwmon_driver = {
	216	.probe = vexpress_hwmon_probe,
0fe763c5	217	.remove = vexpress_hwmon_remove,
48ed8877 PM	218	.driver = {
	219	.name = DRVNAME,
	220	.owner = THIS_MODULE,
	221	.of_match_table = vexpress_hwmon_of_match,
	222	},
	223	};
	224
	225	module_platform_driver(vexpress_hwmon_driver);
	226
	227	MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
	228	MODULE_DESCRIPTION("Versatile Express hwmon sensors driver");
	229	MODULE_LICENSE("GPL");
	230	MODULE_ALIAS("platform:vexpress-hwmon");