[linux-2.6-block.git] / drivers / hwmon / ad7414.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * An hwmon driver for the Analog Devices AD7414
 *
 * Copyright 2006 Stefan Roese <sr at denx.de>, DENX Software Engineering
 *
 * Copyright (c) 2008 PIKA Technologies
 *   Sean MacLennan <smaclennan@pikatech.com>
 *
 * Copyright (c) 2008 Spansion Inc.
 *   Frank Edelhaeuser <frank.edelhaeuser at spansion.com>
 *   (converted to "new style" I2C driver model, removed checkpatch.pl warnings)
 *
 * Based on ad7418.c
 * Copyright 2006 Tower Technologies, Alessandro Zummo <a.zummo at towertech.it>
 */

#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include <linux/slab.h>


/* AD7414 registers */
#define AD7414_REG_TEMP		0x00
#define AD7414_REG_CONF		0x01
#define AD7414_REG_T_HIGH	0x02
#define AD7414_REG_T_LOW	0x03

static u8 AD7414_REG_LIMIT[] = { AD7414_REG_T_HIGH, AD7414_REG_T_LOW };

struct ad7414_data {
	struct i2c_client	*client;
	struct mutex		lock;	/* atomic read data updates */
	char			valid;	/* !=0 if following fields are valid */
	unsigned long		next_update;	/* In jiffies */
	s16			temp_input;	/* Register values */
	s8			temps[ARRAY_SIZE(AD7414_REG_LIMIT)];
};

/* REG: (0.25C/bit, two's complement) << 6 */
static inline int ad7414_temp_from_reg(s16 reg)
{
	/*
	 * use integer division instead of equivalent right shift to
	 * guarantee arithmetic shift and preserve the sign
	 */
	return ((int)reg / 64) * 250;
}

static inline int ad7414_read(struct i2c_client *client, u8 reg)
{
	if (reg == AD7414_REG_TEMP)
		return i2c_smbus_read_word_swapped(client, reg);
	else
		return i2c_smbus_read_byte_data(client, reg);
}

static inline int ad7414_write(struct i2c_client *client, u8 reg, u8 value)
{
	return i2c_smbus_write_byte_data(client, reg, value);
}

static struct ad7414_data *ad7414_update_device(struct device *dev)
{
	struct ad7414_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;

	mutex_lock(&data->lock);

	if (time_after(jiffies, data->next_update) || !data->valid) {
		int value, i;

		dev_dbg(&client->dev, "starting ad7414 update\n");

		value = ad7414_read(client, AD7414_REG_TEMP);
		if (value < 0)
			dev_dbg(&client->dev, "AD7414_REG_TEMP err %d\n",
				value);
		else
			data->temp_input = value;

		for (i = 0; i < ARRAY_SIZE(AD7414_REG_LIMIT); ++i) {
			value = ad7414_read(client, AD7414_REG_LIMIT[i]);
			if (value < 0)
				dev_dbg(&client->dev, "AD7414 reg %d err %d\n",
					AD7414_REG_LIMIT[i], value);
			else
				data->temps[i] = value;
		}

		data->next_update = jiffies + HZ + HZ / 2;
		data->valid = 1;
	}

	mutex_unlock(&data->lock);

	return data;
}

static ssize_t temp_input_show(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	struct ad7414_data *data = ad7414_update_device(dev);
	return sprintf(buf, "%d\n", ad7414_temp_from_reg(data->temp_input));
}
static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);

static ssize_t max_min_show(struct device *dev, struct device_attribute *attr,
			    char *buf)
{
	int index = to_sensor_dev_attr(attr)->index;
	struct ad7414_data *data = ad7414_update_device(dev);
	return sprintf(buf, "%d\n", data->temps[index] * 1000);
}

static ssize_t max_min_store(struct device *dev,
			     struct device_attribute *attr, const char *buf,
			     size_t count)
{
	struct ad7414_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int index = to_sensor_dev_attr(attr)->index;
	u8 reg = AD7414_REG_LIMIT[index];
	long temp;
	int ret = kstrtol(buf, 10, &temp);

	if (ret < 0)
		return ret;

	temp = clamp_val(temp, -40000, 85000);
	temp = (temp + (temp < 0 ? -500 : 500)) / 1000;

	mutex_lock(&data->lock);
	data->temps[index] = temp;
	ad7414_write(client, reg, temp);
	mutex_unlock(&data->lock);
	return count;
}

static SENSOR_DEVICE_ATTR_RW(temp1_max, max_min, 0);
static SENSOR_DEVICE_ATTR_RW(temp1_min, max_min, 1);

static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	int bitnr = to_sensor_dev_attr(attr)->index;
	struct ad7414_data *data = ad7414_update_device(dev);
	int value = (data->temp_input >> bitnr) & 1;
	return sprintf(buf, "%d\n", value);
}

static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, alarm, 3);
static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 4);

static struct attribute *ad7414_attrs[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	NULL
};

ATTRIBUTE_GROUPS(ad7414);

static int ad7414_probe(struct i2c_client *client,
			const struct i2c_device_id *dev_id)
{
	struct device *dev = &client->dev;
	struct ad7414_data *data;
	struct device *hwmon_dev;
	int conf;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA |
				     I2C_FUNC_SMBUS_READ_WORD_DATA))
		return -EOPNOTSUPP;

	data = devm_kzalloc(dev, sizeof(struct ad7414_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->client = client;
	mutex_init(&data->lock);

	dev_info(&client->dev, "chip found\n");

	/* Make sure the chip is powered up. */
	conf = i2c_smbus_read_byte_data(client, AD7414_REG_CONF);
	if (conf < 0)
		dev_warn(dev, "ad7414_probe unable to read config register.\n");
	else {
		conf &= ~(1 << 7);
		i2c_smbus_write_byte_data(client, AD7414_REG_CONF, conf);
	}

	hwmon_dev = devm_hwmon_device_register_with_groups(dev,
							   client->name,
							   data, ad7414_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

static const struct i2c_device_id ad7414_id[] = {
	{ "ad7414", 0 },
	{}
};
MODULE_DEVICE_TABLE(i2c, ad7414_id);

static const struct of_device_id __maybe_unused ad7414_of_match[] = {
	{ .compatible = "ad,ad7414" },
	{ },
};
MODULE_DEVICE_TABLE(of, ad7414_of_match);

static struct i2c_driver ad7414_driver = {
	.driver = {
		.name	= "ad7414",
		.of_match_table = of_match_ptr(ad7414_of_match),
	},
	.probe	= ad7414_probe,
	.id_table = ad7414_id,
};

module_i2c_driver(ad7414_driver);

MODULE_AUTHOR("Stefan Roese <sr at denx.de>, "
	      "Frank Edelhaeuser <frank.edelhaeuser at spansion.com>");

MODULE_DESCRIPTION("AD7414 driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
6c633c30 SM	2	/*
	3	* An hwmon driver for the Analog Devices AD7414
	4	*
	5	* Copyright 2006 Stefan Roese <sr at denx.de>, DENX Software Engineering
	6	*
	7	* Copyright (c) 2008 PIKA Technologies
	8	* Sean MacLennan <smaclennan@pikatech.com>
	9	*
	10	* Copyright (c) 2008 Spansion Inc.
	11	* Frank Edelhaeuser <frank.edelhaeuser at spansion.com>
	12	* (converted to "new style" I2C driver model, removed checkpatch.pl warnings)
	13	*
	14	* Based on ad7418.c
	15	* Copyright 2006 Tower Technologies, Alessandro Zummo <a.zummo at towertech.it>
6c633c30 SM	16	*/
	17
	18	#include <linux/module.h>
	19	#include <linux/jiffies.h>
	20	#include <linux/i2c.h>
	21	#include <linux/hwmon.h>
	22	#include <linux/hwmon-sysfs.h>
	23	#include <linux/err.h>
	24	#include <linux/mutex.h>
	25	#include <linux/sysfs.h>
5a0e3ad6	26	#include <linux/slab.h>
6c633c30 SM	27
	28
	29	/* AD7414 registers */
	30	#define AD7414_REG_TEMP 0x00
	31	#define AD7414_REG_CONF 0x01
	32	#define AD7414_REG_T_HIGH 0x02
	33	#define AD7414_REG_T_LOW 0x03
	34
	35	static u8 AD7414_REG_LIMIT[] = { AD7414_REG_T_HIGH, AD7414_REG_T_LOW };
	36
	37	struct ad7414_data {
045c1391	38	struct i2c_client *client;
6c633c30 SM	39	struct mutex lock; /* atomic read data updates */
	40	char valid; /* !=0 if following fields are valid */
	41	unsigned long next_update; /* In jiffies */
	42	s16 temp_input; /* Register values */
	43	s8 temps[ARRAY_SIZE(AD7414_REG_LIMIT)];
	44	};
	45
	46	/* REG: (0.25C/bit, two's complement) << 6 */
	47	static inline int ad7414_temp_from_reg(s16 reg)
	48	{
8deeac82 GR	49	/*
8deeac82 GR	50	* use integer division instead of equivalent right shift to
6c633c30 SM	51	* guarantee arithmetic shift and preserve the sign
	52	*/
	53	return ((int)reg / 64) * 250;
	54	}
	55
	56	static inline int ad7414_read(struct i2c_client *client, u8 reg)
	57	{
90f4102c JD	58	if (reg == AD7414_REG_TEMP)
	59	return i2c_smbus_read_word_swapped(client, reg);
	60	else
6c633c30 SM	61	return i2c_smbus_read_byte_data(client, reg);
	62	}
	63
	64	static inline int ad7414_write(struct i2c_client *client, u8 reg, u8 value)
	65	{
	66	return i2c_smbus_write_byte_data(client, reg, value);
	67	}
	68
d130d971	69	static struct ad7414_data ad7414_update_device(struct device dev)
6c633c30	70	{
045c1391 AL	71	struct ad7414_data *data = dev_get_drvdata(dev);
045c1391 AL	72	struct i2c_client *client = data->client;
6c633c30 SM	73
	74	mutex_lock(&data->lock);
	75
	76	if (time_after(jiffies, data->next_update) \|\| !data->valid) {
	77	int value, i;
	78
	79	dev_dbg(&client->dev, "starting ad7414 update\n");
	80
	81	value = ad7414_read(client, AD7414_REG_TEMP);
	82	if (value < 0)
	83	dev_dbg(&client->dev, "AD7414_REG_TEMP err %d\n",
	84	value);
	85	else
	86	data->temp_input = value;
	87
	88	for (i = 0; i < ARRAY_SIZE(AD7414_REG_LIMIT); ++i) {
	89	value = ad7414_read(client, AD7414_REG_LIMIT[i]);
	90	if (value < 0)
	91	dev_dbg(&client->dev, "AD7414 reg %d err %d\n",
	92	AD7414_REG_LIMIT[i], value);
	93	else
	94	data->temps[i] = value;
	95	}
	96
	97	data->next_update = jiffies + HZ + HZ / 2;
	98	data->valid = 1;
	99	}
	100
	101	mutex_unlock(&data->lock);
	102
	103	return data;
	104	}
	105
cbf6cb2b	106	static ssize_t temp_input_show(struct device *dev,
6c633c30 SM	107	struct device_attribute attr, char buf)
	108	{
	109	struct ad7414_data *data = ad7414_update_device(dev);
	110	return sprintf(buf, "%d\n", ad7414_temp_from_reg(data->temp_input));
	111	}
cbf6cb2b	112	static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
6c633c30	113
cbf6cb2b GR	114	static ssize_t max_min_show(struct device dev, struct device_attribute attr,
cbf6cb2b GR	115	char *buf)
6c633c30 SM	116	{
	117	int index = to_sensor_dev_attr(attr)->index;
	118	struct ad7414_data *data = ad7414_update_device(dev);
	119	return sprintf(buf, "%d\n", data->temps[index] * 1000);
	120	}
	121
cbf6cb2b GR	122	static ssize_t max_min_store(struct device *dev,
	123	struct device_attribute attr, const char buf,
	124	size_t count)
6c633c30	125	{
045c1391 AL	126	struct ad7414_data *data = dev_get_drvdata(dev);
045c1391 AL	127	struct i2c_client *client = data->client;
6c633c30 SM	128	int index = to_sensor_dev_attr(attr)->index;
6c633c30 SM	129	u8 reg = AD7414_REG_LIMIT[index];
dcb7cb97 FM	130	long temp;
	131	int ret = kstrtol(buf, 10, &temp);
	132
	133	if (ret < 0)
	134	return ret;
6c633c30	135
2a844c14	136	temp = clamp_val(temp, -40000, 85000);
6c633c30 SM	137	temp = (temp + (temp < 0 ? -500 : 500)) / 1000;
	138
	139	mutex_lock(&data->lock);
	140	data->temps[index] = temp;
	141	ad7414_write(client, reg, temp);
	142	mutex_unlock(&data->lock);
	143	return count;
	144	}
	145
cbf6cb2b GR	146	static SENSOR_DEVICE_ATTR_RW(temp1_max, max_min, 0);
cbf6cb2b GR	147	static SENSOR_DEVICE_ATTR_RW(temp1_min, max_min, 1);
6c633c30	148
cbf6cb2b	149	static ssize_t alarm_show(struct device dev, struct device_attribute attr,
6c633c30 SM	150	char *buf)
	151	{
	152	int bitnr = to_sensor_dev_attr(attr)->index;
	153	struct ad7414_data *data = ad7414_update_device(dev);
	154	int value = (data->temp_input >> bitnr) & 1;
	155	return sprintf(buf, "%d\n", value);
	156	}
	157
cbf6cb2b GR	158	static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, alarm, 3);
cbf6cb2b GR	159	static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 4);
6c633c30	160
045c1391	161	static struct attribute *ad7414_attrs[] = {
6c633c30 SM	162	&sensor_dev_attr_temp1_input.dev_attr.attr,
	163	&sensor_dev_attr_temp1_max.dev_attr.attr,
	164	&sensor_dev_attr_temp1_min.dev_attr.attr,
	165	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	166	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	167	NULL
	168	};
	169
045c1391	170	ATTRIBUTE_GROUPS(ad7414);
6c633c30 SM	171
	172	static int ad7414_probe(struct i2c_client *client,
	173	const struct i2c_device_id *dev_id)
	174	{
045c1391	175	struct device *dev = &client->dev;
6c633c30	176	struct ad7414_data *data;
045c1391	177	struct device *hwmon_dev;
6c633c30	178	int conf;
6c633c30 SM	179
6c633c30 SM	180	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA \|
0fee6591 GR	181	I2C_FUNC_SMBUS_READ_WORD_DATA))
0fee6591 GR	182	return -EOPNOTSUPP;
6c633c30	183
045c1391	184	data = devm_kzalloc(dev, sizeof(struct ad7414_data), GFP_KERNEL);
0fee6591 GR	185	if (!data)
0fee6591 GR	186	return -ENOMEM;
6c633c30	187
045c1391	188	data->client = client;
6c633c30 SM	189	mutex_init(&data->lock);
	190
	191	dev_info(&client->dev, "chip found\n");
	192
	193	/* Make sure the chip is powered up. */
	194	conf = i2c_smbus_read_byte_data(client, AD7414_REG_CONF);
	195	if (conf < 0)
045c1391	196	dev_warn(dev, "ad7414_probe unable to read config register.\n");
6c633c30 SM	197	else {
	198	conf &= ~(1 << 7);
	199	i2c_smbus_write_byte_data(client, AD7414_REG_CONF, conf);
	200	}
	201
045c1391 AL	202	hwmon_dev = devm_hwmon_device_register_with_groups(dev,
	203	client->name,
	204	data, ad7414_groups);
	205	return PTR_ERR_OR_ZERO(hwmon_dev);
6c633c30 SM	206	}
	207
	208	static const struct i2c_device_id ad7414_id[] = {
	209	{ "ad7414", 0 },
	210	{}
	211	};
6407deb5	212	MODULE_DEVICE_TABLE(i2c, ad7414_id);
6c633c30	213
07182986	214	static const struct of_device_id __maybe_unused ad7414_of_match[] = {
72edf311 JMC	215	{ .compatible = "ad,ad7414" },
	216	{ },
	217	};
	218	MODULE_DEVICE_TABLE(of, ad7414_of_match);
	219
6c633c30 SM	220	static struct i2c_driver ad7414_driver = {
	221	.driver = {
	222	.name = "ad7414",
72edf311	223	.of_match_table = of_match_ptr(ad7414_of_match),
6c633c30 SM	224	},
6c633c30 SM	225	.probe = ad7414_probe,
6c633c30 SM	226	.id_table = ad7414_id,
	227	};
	228
f0967eea	229	module_i2c_driver(ad7414_driver);
6c633c30 SM	230
	231	MODULE_AUTHOR("Stefan Roese <sr at denx.de>, "
	232	"Frank Edelhaeuser <frank.edelhaeuser at spansion.com>");
	233
	234	MODULE_DESCRIPTION("AD7414 driver");
	235	MODULE_LICENSE("GPL");