mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
a10e763b87
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 135 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190531081036.435762997@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
318 lines
7.6 KiB
C
318 lines
7.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* 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>
|
|
*/
|
|
|
|
#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/of_device.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 int ad7418_update_device(struct device *dev)
|
|
{
|
|
struct ad7418_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
s32 val;
|
|
|
|
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 */
|
|
val = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
|
|
if (val < 0)
|
|
goto abort;
|
|
|
|
cfg = val;
|
|
cfg &= 0x1F;
|
|
|
|
val = i2c_smbus_write_byte_data(client, AD7418_REG_CONF,
|
|
cfg | AD7418_CH_TEMP);
|
|
if (val < 0)
|
|
goto abort;
|
|
|
|
udelay(30);
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
val = i2c_smbus_read_word_swapped(client,
|
|
AD7418_REG_TEMP[i]);
|
|
if (val < 0)
|
|
goto abort;
|
|
|
|
data->temp[i] = val;
|
|
}
|
|
|
|
for (i = 0, ch = 4; i < data->adc_max; i++, ch--) {
|
|
val = i2c_smbus_write_byte_data(client, AD7418_REG_CONF,
|
|
cfg | AD7418_REG_ADC_CH(ch));
|
|
if (val < 0)
|
|
goto abort;
|
|
|
|
udelay(15);
|
|
val = i2c_smbus_read_word_swapped(client,
|
|
AD7418_REG_ADC);
|
|
if (val < 0)
|
|
goto abort;
|
|
|
|
data->in[data->adc_max - 1 - i] = val;
|
|
}
|
|
|
|
/* restore old configuration value */
|
|
val = i2c_smbus_write_word_swapped(client, AD7418_REG_CONF,
|
|
cfg);
|
|
if (val < 0)
|
|
goto abort;
|
|
|
|
data->last_updated = jiffies;
|
|
data->valid = 1;
|
|
}
|
|
|
|
mutex_unlock(&data->lock);
|
|
return 0;
|
|
|
|
abort:
|
|
data->valid = 0;
|
|
mutex_unlock(&data->lock);
|
|
return val;
|
|
}
|
|
|
|
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 = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
ret = ad7418_update_device(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
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 = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
ret = ad7418_update_device(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
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;
|
|
if (dev->of_node)
|
|
data->type = (enum chips)of_device_get_match_data(dev);
|
|
else
|
|
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 const struct of_device_id ad7418_dt_ids[] = {
|
|
{ .compatible = "adi,ad7416", .data = (void *)ad7416, },
|
|
{ .compatible = "adi,ad7417", .data = (void *)ad7417, },
|
|
{ .compatible = "adi,ad7418", .data = (void *)ad7418, },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ad7418_dt_ids);
|
|
|
|
static struct i2c_driver ad7418_driver = {
|
|
.driver = {
|
|
.name = "ad7418",
|
|
.of_match_table = ad7418_dt_ids,
|
|
},
|
|
.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);
|