240 lines
6.4 KiB
C
240 lines
6.4 KiB
C
/*
|
|
* 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>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
#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");
|