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linux/drivers/hwmon/ad7418.c
Guenter Roeck 6fdc5d7fa9 hwmon: (ad7418) Use permission specific SENSOR[_DEVICE]_ATTR variants 
Use SENSOR[_DEVICE]_ATTR[_2]_{RO,RW,WO} to simplify the source code,
to improve readbility, and to reduce the chance of inconsistencies.

Also replace any remaining S_<PERMS> in the driver with octal values.

The conversion was done automatically with coccinelle. The semantic patches
and the scripts used to generate this commit log are available at
https://github.com/groeck/coccinelle-patches/hwmon/.

This patch does not introduce functional changes. It was verified by
compiling the old and new files and comparing text and data sizes.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2018-12-16 15:13:32 -08:00

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/*
* An hwmon driver for the Analog Devices AD7416/17/18
* Copyright (C) 2006-07 Tower Technologies
*
* Author: Alessandro Zummo <a.zummo@towertech.it>
*
* Based on lm75.c
* Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
*
* 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 - version 2.
*/
#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/delay.h>
#include <linux/slab.h>
#include "lm75.h"
#define DRV_VERSION "0.4"
enum chips { ad7416, ad7417, ad7418 };
/* AD7418 registers */
#define AD7418_REG_TEMP_IN 0x00
#define AD7418_REG_CONF 0x01
#define AD7418_REG_TEMP_HYST 0x02
#define AD7418_REG_TEMP_OS 0x03
#define AD7418_REG_ADC 0x04
#define AD7418_REG_CONF2 0x05
#define AD7418_REG_ADC_CH(x) ((x) << 5)
#define AD7418_CH_TEMP AD7418_REG_ADC_CH(0)
static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN,
AD7418_REG_TEMP_HYST,
AD7418_REG_TEMP_OS };
struct ad7418_data {
struct i2c_client *client;
enum chips type;
struct mutex lock;
int adc_max; /* number of ADC channels */
char valid;
unsigned long last_updated; /* In jiffies */
s16 temp[3]; /* Register values */
u16 in[4];
};
static struct ad7418_data *ad7418_update_device(struct device *dev)
{
struct ad7418_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
mutex_lock(&data->lock);
if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
|| !data->valid) {
u8 cfg;
int i, ch;
/* read config register and clear channel bits */
cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
cfg &= 0x1F;
i2c_smbus_write_byte_data(client, AD7418_REG_CONF,
cfg | AD7418_CH_TEMP);
udelay(30);
for (i = 0; i < 3; i++) {
data->temp[i] =
i2c_smbus_read_word_swapped(client,
AD7418_REG_TEMP[i]);
}
for (i = 0, ch = 4; i < data->adc_max; i++, ch--) {
i2c_smbus_write_byte_data(client,
AD7418_REG_CONF,
cfg | AD7418_REG_ADC_CH(ch));
udelay(15);
data->in[data->adc_max - 1 - i] =
i2c_smbus_read_word_swapped(client,
AD7418_REG_ADC);
}
/* restore old configuration value */
i2c_smbus_write_word_swapped(client, AD7418_REG_CONF, cfg);
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->lock);
return data;
}
static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct ad7418_data *data = ad7418_update_device(dev);
return sprintf(buf, "%d\n",
LM75_TEMP_FROM_REG(data->temp[attr->index]));
}
static ssize_t adc_show(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct ad7418_data *data = ad7418_update_device(dev);
return sprintf(buf, "%d\n",
((data->in[attr->index] >> 6) * 2500 + 512) / 1024);
}
static ssize_t temp_store(struct device *dev,
struct device_attribute *devattr, const char *buf,
size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct ad7418_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
long temp;
int ret = kstrtol(buf, 10, &temp);
if (ret < 0)
return ret;
mutex_lock(&data->lock);
data->temp[attr->index] = LM75_TEMP_TO_REG(temp);
i2c_smbus_write_word_swapped(client,
AD7418_REG_TEMP[attr->index],
data->temp[attr->index]);
mutex_unlock(&data->lock);
return count;
}
static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, temp, 1);
static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 2);
static SENSOR_DEVICE_ATTR_RO(in1_input, adc, 0);
static SENSOR_DEVICE_ATTR_RO(in2_input, adc, 1);
static SENSOR_DEVICE_ATTR_RO(in3_input, adc, 2);
static SENSOR_DEVICE_ATTR_RO(in4_input, adc, 3);
static struct attribute *ad7416_attrs[] = {
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
&sensor_dev_attr_temp1_input.dev_attr.attr,
NULL
};
ATTRIBUTE_GROUPS(ad7416);
static struct attribute *ad7417_attrs[] = {
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_in1_input.dev_attr.attr,
&sensor_dev_attr_in2_input.dev_attr.attr,
&sensor_dev_attr_in3_input.dev_attr.attr,
&sensor_dev_attr_in4_input.dev_attr.attr,
NULL
};
ATTRIBUTE_GROUPS(ad7417);
static struct attribute *ad7418_attrs[] = {
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_in1_input.dev_attr.attr,
NULL
};
ATTRIBUTE_GROUPS(ad7418);
static void ad7418_init_client(struct i2c_client *client)
{
struct ad7418_data *data = i2c_get_clientdata(client);
int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
if (reg < 0) {
dev_err(&client->dev, "cannot read configuration register\n");
} else {
dev_info(&client->dev, "configuring for mode 1\n");
i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe);
if (data->type == ad7417 || data->type == ad7418)
i2c_smbus_write_byte_data(client,
AD7418_REG_CONF2, 0x00);
}
}
static int ad7418_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct i2c_adapter *adapter = client->adapter;
struct ad7418_data *data;
struct device *hwmon_dev;
const struct attribute_group **attr_groups = NULL;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_WORD_DATA))
return -EOPNOTSUPP;
data = devm_kzalloc(dev, sizeof(struct ad7418_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
i2c_set_clientdata(client, data);
mutex_init(&data->lock);
data->client = client;
data->type = id->driver_data;
switch (data->type) {
case ad7416:
data->adc_max = 0;
attr_groups = ad7416_groups;
break;
case ad7417:
data->adc_max = 4;
attr_groups = ad7417_groups;
break;
case ad7418:
data->adc_max = 1;
attr_groups = ad7418_groups;
break;
}
dev_info(dev, "%s chip found\n", client->name);
/* Initialize the AD7418 chip */
ad7418_init_client(client);
hwmon_dev = devm_hwmon_device_register_with_groups(dev,
client->name,
data, attr_groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct i2c_device_id ad7418_id[] = {
{ "ad7416", ad7416 },
{ "ad7417", ad7417 },
{ "ad7418", ad7418 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ad7418_id);
static struct i2c_driver ad7418_driver = {
.driver = {
.name = "ad7418",
},
.probe = ad7418_probe,
.id_table = ad7418_id,
};
module_i2c_driver(ad7418_driver);
MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
MODULE_DESCRIPTION("AD7416/17/18 driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
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