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hwmon: (adt7410) Add support for the adt7310/adt7320 

The adt7310/adt7320 is the SPI version of the adt7410/adt7420. The register map
layout is a bit different, i.e. the register addresses differ between the two
variants, but the bit layouts of the individual registers are identical. So both
chip variants can easily be supported by the same driver. The issue of non
matching register address layouts is solved by a simple look-up table which
translates the I2C addresses to the SPI addresses.

The patch moves the bulk of the adt7410 driver to a common module that will be
shared by the adt7410 and adt7310 drivers. This common module implements the
driver logic and uses a set of virtual functions to perform IO access. The
adt7410 and adt7310 driver modules provide proper implementations of these IO
accessor functions for I2C respective SPI.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Reviewed-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Lars-Peter Clausen 2013-03-12 11:38:46 +01:00 коммит произвёл Guenter Roeck
Родитель c55dc91e92
Коммит 51c2a4871c
7 изменённых файлов: 726 добавлений и 460 удалений
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45
Documentation/hwmon/adt7410
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@ -12,29 +12,42 @@ Supported chips:
Addresses scanned: None
Datasheet: Publicly available at the Analog Devices website
http://www.analog.com/static/imported-files/data_sheets/ADT7420.pdf
* Analog Devices ADT7310
Prefix: 'adt7310'
Addresses scanned: None
Datasheet: Publicly available at the Analog Devices website
http://www.analog.com/static/imported-files/data_sheets/ADT7310.pdf
* Analog Devices ADT7320
Prefix: 'adt7320'
Addresses scanned: None
Datasheet: Publicly available at the Analog Devices website
http://www.analog.com/static/imported-files/data_sheets/ADT7320.pdf
Author: Hartmut Knaack <knaack.h@gmx.de>
Description
-----------
The ADT7410 is a temperature sensor with rated temperature range of -55°C to
+150°C. It has a high accuracy of +/-0.5°C and can be operated at a resolution
of 13 bits (0.0625°C) or 16 bits (0.0078°C). The sensor provides an INT pin to
indicate that a minimum or maximum temperature set point has been exceeded, as
well as a critical temperature (CT) pin to indicate that the critical
temperature set point has been exceeded. Both pins can be set up with a common
hysteresis of 0°C - 15°C and a fault queue, ranging from 1 to 4 events. Both
pins can individually set to be active-low or active-high, while the whole
device can either run in comparator mode or interrupt mode. The ADT7410
supports continous temperature sampling, as well as sampling one temperature
value per second or even justget one sample on demand for power saving.
Besides, it can completely power down its ADC, if power management is
required.
The ADT7310/ADT7410 is a temperature sensor with rated temperature range of
-55°C to +150°C. It has a high accuracy of +/-0.5°C and can be operated at a
resolution of 13 bits (0.0625°C) or 16 bits (0.0078°C). The sensor provides an
INT pin to indicate that a minimum or maximum temperature set point has been
exceeded, as well as a critical temperature (CT) pin to indicate that the
critical temperature set point has been exceeded. Both pins can be set up with a
common hysteresis of 0°C - 15°C and a fault queue, ranging from 1 to 4 events.
Both pins can individually set to be active-low or active-high, while the whole
device can either run in comparator mode or interrupt mode. The ADT7410 supports
continuous temperature sampling, as well as sampling one temperature value per
second or even just get one sample on demand for power saving. Besides, it can
completely power down its ADC, if power management is required.
The ADT7420 is register compatible, the only differences being the package,
a slightly narrower operating temperature range (-40°C to +150°C), and a
better accuracy (0.25°C instead of 0.50°C.)
The ADT7320/ADT7420 is register compatible, the only differences being the
package, a slightly narrower operating temperature range (-40°C to +150°C), and
a better accuracy (0.25°C instead of 0.50°C.)
The difference between the ADT7310/ADT7320 and ADT7410/ADT7420 is the control
interface, the ADT7310 and ADT7320 use SPI while the ADT7410 and ADT7420 use
I2C.
Configuration Notes
-------------------

20
drivers/hwmon/Kconfig
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@ -179,9 +179,29 @@ config SENSORS_ADM9240
This driver can also be built as a module. If so, the module
will be called adm9240.
config SENSORS_ADT7X10
tristate
help
This module contains common code shared by the ADT7310/ADT7320 and
ADT7410/ADT7420 temperature monitoring chip drivers.
If build as a module, the module will be called adt7x10.
config SENSORS_ADT7310
tristate "Analog Devices ADT7310/ADT7320"
depends on SPI_MASTER
select SENSORS_ADT7X10
help
If you say yes here you get support for the Analog Devices
ADT7310 and ADT7320 temperature monitoring chips.
This driver can also be built as a module. If so, the module
will be called adt7310.
config SENSORS_ADT7410
tristate "Analog Devices ADT7410/ADT7420"
depends on I2C
select SENSORS_ADT7X10
help
If you say yes here you get support for the Analog Devices
ADT7410 and ADT7420 temperature monitoring chips.

2
drivers/hwmon/Makefile
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@ -34,6 +34,8 @@ obj-$(CONFIG_SENSORS_ADM9240) += adm9240.o
obj-$(CONFIG_SENSORS_ADS1015) += ads1015.o
obj-$(CONFIG_SENSORS_ADS7828) += ads7828.o
obj-$(CONFIG_SENSORS_ADS7871) += ads7871.o
obj-$(CONFIG_SENSORS_ADT7X10) += adt7x10.o
obj-$(CONFIG_SENSORS_ADT7310) += adt7310.o
obj-$(CONFIG_SENSORS_ADT7410) += adt7410.o
obj-$(CONFIG_SENSORS_ADT7411) += adt7411.o
obj-$(CONFIG_SENSORS_ADT7462) += adt7462.o

123
drivers/hwmon/adt7310.c Normal file
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@ -0,0 +1,123 @@
/*
* ADT7310/ADT7310 digital temperature sensor driver
*
* Copyright 2012-2013 Analog Devices Inc.
* Author: Lars-Peter Clausen <lars@metafoo.de>
*
* Licensed under the GPL-2 or later.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/spi/spi.h>
#include <asm/unaligned.h>
#include "adt7x10.h"
#define ADT7310_STATUS 0
#define ADT7310_CONFIG 1
#define ADT7310_TEMPERATURE 2
#define ADT7310_ID 3
#define ADT7310_T_CRIT 4
#define ADT7310_T_HYST 5
#define ADT7310_T_ALARM_HIGH 6
#define ADT7310_T_ALARM_LOW 7
static const u8 adt7310_reg_table[] = {
[ADT7X10_TEMPERATURE] = ADT7310_TEMPERATURE,
[ADT7X10_STATUS] = ADT7310_STATUS,
[ADT7X10_CONFIG] = ADT7310_CONFIG,
[ADT7X10_T_ALARM_HIGH] = ADT7310_T_ALARM_HIGH,
[ADT7X10_T_ALARM_LOW] = ADT7310_T_ALARM_LOW,
[ADT7X10_T_CRIT] = ADT7310_T_CRIT,
[ADT7X10_T_HYST] = ADT7310_T_HYST,
[ADT7X10_ID] = ADT7310_ID,
};
#define ADT7310_CMD_REG_OFFSET 3
#define ADT7310_CMD_READ 0x40
#define AD7310_COMMAND(reg) (adt7310_reg_table[(reg)] << ADT7310_CMD_REG_OFFSET)
static int adt7310_spi_read_word(struct device *dev, u8 reg)
{
struct spi_device *spi = to_spi_device(dev);
int ret;
ret = spi_w8r16(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
if (ret < 0)
return ret;
return be16_to_cpu(ret);
}
static int adt7310_spi_write_word(struct device *dev, u8 reg, u16 data)
{
struct spi_device *spi = to_spi_device(dev);
u8 buf[3];
buf[0] = AD7310_COMMAND(reg);
put_unaligned_be16(data, &buf[1]);
return spi_write(spi, buf, sizeof(buf));
}
static int adt7310_spi_read_byte(struct device *dev, u8 reg)
{
struct spi_device *spi = to_spi_device(dev);
return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
}
static int adt7310_spi_write_byte(struct device *dev, u8 reg,
u8 data)
{
struct spi_device *spi = to_spi_device(dev);
u8 buf[2];
buf[0] = AD7310_COMMAND(reg);
buf[1] = data;
return spi_write(spi, buf, sizeof(buf));
}
static const struct adt7x10_ops adt7310_spi_ops = {
.read_word = adt7310_spi_read_word,
.write_word = adt7310_spi_write_word,
.read_byte = adt7310_spi_read_byte,
.write_byte = adt7310_spi_write_byte,
};
static int adt7310_spi_probe(struct spi_device *spi)
{
return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name,
&adt7310_spi_ops);
}
static int adt7310_spi_remove(struct spi_device *spi)
{
return adt7x10_remove(&spi->dev);
}
static const struct spi_device_id adt7310_id[] = {
{ "adt7310", 0 },
{ "adt7320", 0 },
{}
};
MODULE_DEVICE_TABLE(spi, adt7310_id);
static struct spi_driver adt7310_driver = {
.driver = {
.name = "adt7310",
.owner = THIS_MODULE,
.pm = ADT7X10_DEV_PM_OPS,
},
.probe = adt7310_spi_probe,
.remove = adt7310_spi_remove,
.id_table = adt7310_id,
};
module_spi_driver(adt7310_driver);
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("ADT7310/ADT7320 driver");
MODULE_LICENSE("GPL");

483
drivers/hwmon/adt7410.c
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@ -1,485 +1,80 @@
/*
* adt7410.c - Part of lm_sensors, Linux kernel modules for hardware
* monitoring
* This driver handles the ADT7410 and compatible digital temperature sensors.
* Hartmut Knaack <knaack.h@gmx.de> 2012-07-22
* based on lm75.c by Frodo Looijaard <frodol@dds.nl>
* and adt7410.c from iio-staging by Sonic Zhang <sonic.zhang@analog.com>
* ADT7410/ADT7420 digital temperature sensor driver
*
* 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.
* Copyright 2012-2013 Analog Devices Inc.
* Author: Lars-Peter Clausen <lars@metafoo.de>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
* Licensed under the GPL-2 or later.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.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>
/*
* ADT7410 registers definition
*/
#include "adt7x10.h"
#define ADT7410_TEMPERATURE 0
#define ADT7410_STATUS 2
#define ADT7410_CONFIG 3
#define ADT7410_T_ALARM_HIGH 4
#define ADT7410_T_ALARM_LOW 6
#define ADT7410_T_CRIT 8
#define ADT7410_T_HYST 0xA
static int adt7410_i2c_read_word(struct device *dev, u8 reg)
{
return i2c_smbus_read_word_swapped(to_i2c_client(dev), reg);
}
/*
* ADT7410 status
*/
#define ADT7410_STAT_T_LOW (1 << 4)
#define ADT7410_STAT_T_HIGH (1 << 5)
#define ADT7410_STAT_T_CRIT (1 << 6)
#define ADT7410_STAT_NOT_RDY (1 << 7)
static int adt7410_i2c_write_word(struct device *dev, u8 reg, u16 data)
{
return i2c_smbus_write_word_swapped(to_i2c_client(dev), reg, data);
}
/*
* ADT7410 config
*/
#define ADT7410_FAULT_QUEUE_MASK (1 << 0 | 1 << 1)
#define ADT7410_CT_POLARITY (1 << 2)
#define ADT7410_INT_POLARITY (1 << 3)
#define ADT7410_EVENT_MODE (1 << 4)
#define ADT7410_MODE_MASK (1 << 5 | 1 << 6)
#define ADT7410_FULL (0 << 5 | 0 << 6)
#define ADT7410_PD (1 << 5 | 1 << 6)
#define ADT7410_RESOLUTION (1 << 7)
static int adt7410_i2c_read_byte(struct device *dev, u8 reg)
{
return i2c_smbus_read_byte_data(to_i2c_client(dev), reg);
}
/*
* ADT7410 masks
*/
#define ADT7410_T13_VALUE_MASK 0xFFF8
#define ADT7410_T_HYST_MASK 0xF
static int adt7410_i2c_write_byte(struct device *dev, u8 reg, u8 data)
{
return i2c_smbus_write_byte_data(to_i2c_client(dev), reg, data);
}
/* straight from the datasheet */
#define ADT7410_TEMP_MIN (-55000)
#define ADT7410_TEMP_MAX 150000
enum adt7410_type { /* keep sorted in alphabetical order */
adt7410,
static const struct adt7x10_ops adt7410_i2c_ops = {
.read_word = adt7410_i2c_read_word,
.write_word = adt7410_i2c_write_word,
.read_byte = adt7410_i2c_read_byte,
.write_byte = adt7410_i2c_write_byte,
};
static const u8 ADT7410_REG_TEMP[4] = {
ADT7410_TEMPERATURE, /* input */
ADT7410_T_ALARM_HIGH, /* high */
ADT7410_T_ALARM_LOW, /* low */
ADT7410_T_CRIT, /* critical */
};
/* Each client has this additional data */
struct adt7410_data {
struct device *hwmon_dev;
struct mutex update_lock;
u8 config;
u8 oldconfig;
bool valid; /* true if registers valid */
unsigned long last_updated; /* In jiffies */
s16 temp[4]; /* Register values,
0 = input
1 = high
2 = low
3 = critical */
u8 hyst; /* hysteresis offset */
};
/*
* adt7410 register access by I2C
*/
static int adt7410_temp_ready(struct i2c_client *client)
static int adt7410_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int i, status;
for (i = 0; i < 6; i++) {
status = i2c_smbus_read_byte_data(client, ADT7410_STATUS);
if (status < 0)
return status;
if (!(status & ADT7410_STAT_NOT_RDY))
return 0;
msleep(60);
}
return -ETIMEDOUT;
}
static int adt7410_update_temp(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct adt7410_data *data = i2c_get_clientdata(client);
int ret = 0;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
|| !data->valid) {
int temp;
dev_dbg(&client->dev, "Starting update\n");
ret = adt7410_temp_ready(client); /* check for new value */
if (ret)
goto abort;
temp = i2c_smbus_read_word_swapped(client, ADT7410_REG_TEMP[0]);
if (temp < 0) {
ret = temp;
dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
ADT7410_REG_TEMP[0], ret);
goto abort;
}
data->temp[0] = temp;
data->last_updated = jiffies;
data->valid = true;
}
abort:
mutex_unlock(&data->update_lock);
return ret;
}
static int adt7410_fill_cache(struct i2c_client *client)
{
struct adt7410_data *data = i2c_get_clientdata(client);
int ret;
int i;
for (i = 1; i < ARRAY_SIZE(ADT7410_REG_TEMP); i++) {
ret = i2c_smbus_read_word_swapped(client, ADT7410_REG_TEMP[i]);
if (ret < 0) {
dev_dbg(&client->dev,
"Failed to read value: reg %d, error %d\n",
ADT7410_REG_TEMP[i], ret);
return ret;
}
data->temp[i] = ret;
}
ret = i2c_smbus_read_byte_data(client, ADT7410_T_HYST);
if (ret < 0) {
dev_dbg(&client->dev,
"Failed to read value: hyst reg, error %d\n",
ret);
return ret;
}
data->hyst = ret;
return 0;
}
static s16 ADT7410_TEMP_TO_REG(long temp)
{
return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7410_TEMP_MIN,
ADT7410_TEMP_MAX) * 128, 1000);
}
static int ADT7410_REG_TO_TEMP(struct adt7410_data *data, s16 reg)
{
/* in 13 bit mode, bits 0-2 are status flags - mask them out */
if (!(data->config & ADT7410_RESOLUTION))
reg &= ADT7410_T13_VALUE_MASK;
/*
* temperature is stored in twos complement format, in steps of
* 1/128°C
*/
return DIV_ROUND_CLOSEST(reg * 1000, 128);
}
/*-----------------------------------------------------------------------*/
/* sysfs attributes for hwmon */
static ssize_t adt7410_show_temp(struct device *dev,
struct device_attribute *da, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct i2c_client *client = to_i2c_client(dev);
struct adt7410_data *data = i2c_get_clientdata(client);
if (attr->index == 0) {
int ret;
ret = adt7410_update_temp(dev);
if (ret)
return ret;
}
return sprintf(buf, "%d\n", ADT7410_REG_TO_TEMP(data,
data->temp[attr->index]));
}
static ssize_t adt7410_set_temp(struct device *dev,
struct device_attribute *da,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct i2c_client *client = to_i2c_client(dev);
struct adt7410_data *data = i2c_get_clientdata(client);
int nr = attr->index;
long temp;
int ret;
ret = kstrtol(buf, 10, &temp);
if (ret)
return ret;
mutex_lock(&data->update_lock);
data->temp[nr] = ADT7410_TEMP_TO_REG(temp);
ret = i2c_smbus_write_word_swapped(client, ADT7410_REG_TEMP[nr],
data->temp[nr]);
if (ret)
count = ret;
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t adt7410_show_t_hyst(struct device *dev,
struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct i2c_client *client = to_i2c_client(dev);
struct adt7410_data *data = i2c_get_clientdata(client);
int nr = attr->index;
int hyst;
hyst = (data->hyst & ADT7410_T_HYST_MASK) * 1000;
/*
* hysteresis is stored as a 4 bit offset in the device, convert it
* to an absolute value
*/
if (nr == 2) /* min has positive offset, others have negative */
hyst = -hyst;
return sprintf(buf, "%d\n",
ADT7410_REG_TO_TEMP(data, data->temp[nr]) - hyst);
}
static ssize_t adt7410_set_t_hyst(struct device *dev,
struct device_attribute *da,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct adt7410_data *data = i2c_get_clientdata(client);
int limit, ret;
long hyst;
ret = kstrtol(buf, 10, &hyst);
if (ret)
return ret;
/* convert absolute hysteresis value to a 4 bit delta value */
limit = ADT7410_REG_TO_TEMP(data, data->temp[1]);
hyst = clamp_val(hyst, ADT7410_TEMP_MIN, ADT7410_TEMP_MAX);
data->hyst = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000), 0,
ADT7410_T_HYST_MASK);
ret = i2c_smbus_write_byte_data(client, ADT7410_T_HYST, data->hyst);
if (ret)
return ret;
return count;
}
static ssize_t adt7410_show_alarm(struct device *dev,
struct device_attribute *da,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
int ret;
ret = i2c_smbus_read_byte_data(client, ADT7410_STATUS);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", !!(ret & attr->index));
}
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adt7410_show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
adt7410_show_temp, adt7410_set_temp, 1);
static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO,
adt7410_show_temp, adt7410_set_temp, 2);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO,
adt7410_show_temp, adt7410_set_temp, 3);
static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
adt7410_show_t_hyst, adt7410_set_t_hyst, 1);
static SENSOR_DEVICE_ATTR(temp1_min_hyst, S_IRUGO,
adt7410_show_t_hyst, NULL, 2);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO,
adt7410_show_t_hyst, NULL, 3);
static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, adt7410_show_alarm,
NULL, ADT7410_STAT_T_LOW);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adt7410_show_alarm,
NULL, ADT7410_STAT_T_HIGH);
static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, adt7410_show_alarm,
NULL, ADT7410_STAT_T_CRIT);
static struct attribute *adt7410_attributes[] = {
&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_crit.dev_attr.attr,
&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
&sensor_dev_attr_temp1_min_hyst.dev_attr.attr,
&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
NULL
};
static const struct attribute_group adt7410_group = {
.attrs = adt7410_attributes,
};
/*-----------------------------------------------------------------------*/
/* device probe and removal */
static int adt7410_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct adt7410_data *data;
int ret;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
return -ENODEV;
data = devm_kzalloc(&client->dev, sizeof(struct adt7410_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
/* configure as specified */
ret = i2c_smbus_read_byte_data(client, ADT7410_CONFIG);
if (ret < 0) {
dev_dbg(&client->dev, "Can't read config? %d\n", ret);
return ret;
}
data->oldconfig = ret;
/*
* Set to 16 bit resolution, continous conversion and comparator mode.
*/
ret &= ~ADT7410_MODE_MASK;
data->config = ret | ADT7410_FULL | ADT7410_RESOLUTION |
ADT7410_EVENT_MODE;
if (data->config != data->oldconfig) {
ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG,
data->config);
if (ret)
return ret;
}
dev_dbg(&client->dev, "Config %02x\n", data->config);
ret = adt7410_fill_cache(client);
if (ret)
goto exit_restore;
/* Register sysfs hooks */
ret = sysfs_create_group(&client->dev.kobj, &adt7410_group);
if (ret)
goto exit_restore;
data->hwmon_dev = hwmon_device_register(&client->dev);
if (IS_ERR(data->hwmon_dev)) {
ret = PTR_ERR(data->hwmon_dev);
goto exit_remove;
}
dev_info(&client->dev, "sensor '%s'\n", client->name);
return 0;
exit_remove:
sysfs_remove_group(&client->dev.kobj, &adt7410_group);
exit_restore:
i2c_smbus_write_byte_data(client, ADT7410_CONFIG, data->oldconfig);
return ret;
return adt7x10_probe(&client->dev, NULL, &adt7410_i2c_ops);
}
static int adt7410_remove(struct i2c_client *client)
static int adt7410_i2c_remove(struct i2c_client *client)
{
struct adt7410_data *data = i2c_get_clientdata(client);
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &adt7410_group);
if (data->oldconfig != data->config)
i2c_smbus_write_byte_data(client, ADT7410_CONFIG,
data->oldconfig);
return 0;
return adt7x10_remove(&client->dev);
}
static const struct i2c_device_id adt7410_ids[] = {
{ "adt7410", adt7410, },
{ "adt7420", adt7410, },
{ /* LIST END */ }
{ "adt7410", 0 },
{ "adt7420", 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, adt7410_ids);
#ifdef CONFIG_PM_SLEEP
static int adt7410_suspend(struct device *dev)
{
int ret;
struct i2c_client *client = to_i2c_client(dev);
struct adt7410_data *data = i2c_get_clientdata(client);
ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG,
data->config | ADT7410_PD);
return ret;
}
static int adt7410_resume(struct device *dev)
{
int ret;
struct i2c_client *client = to_i2c_client(dev);
struct adt7410_data *data = i2c_get_clientdata(client);
ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG, data->config);
return ret;
}
static SIMPLE_DEV_PM_OPS(adt7410_dev_pm_ops, adt7410_suspend, adt7410_resume);
#define ADT7410_DEV_PM_OPS (&adt7410_dev_pm_ops)
#else
#define ADT7410_DEV_PM_OPS NULL
#endif /* CONFIG_PM */
static struct i2c_driver adt7410_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "adt7410",
.pm = ADT7410_DEV_PM_OPS,
.pm = ADT7X10_DEV_PM_OPS,
},
.probe = adt7410_probe,
.remove = adt7410_remove,
.probe = adt7410_i2c_probe,
.remove = adt7410_i2c_remove,
.id_table = adt7410_ids,
.address_list = I2C_ADDRS(0x48, 0x49, 0x4a, 0x4b),
};
module_i2c_driver(adt7410_driver);
MODULE_AUTHOR("Hartmut Knaack");
MODULE_DESCRIPTION("ADT7410/ADT7420 driver");
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("ADT7410/AD7420 driver");
MODULE_LICENSE("GPL");

476
drivers/hwmon/adt7x10.c Normal file
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/*
* adt7x10.c - Part of lm_sensors, Linux kernel modules for hardware
* monitoring
* This driver handles the ADT7410 and compatible digital temperature sensors.
* Hartmut Knaack <knaack.h@gmx.de> 2012-07-22
* based on lm75.c by Frodo Looijaard <frodol@dds.nl>
* and adt7410.c from iio-staging by Sonic Zhang <sonic.zhang@analog.com>
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include "adt7x10.h"
/*
* ADT7X10 status
*/
#define ADT7X10_STAT_T_LOW (1 << 4)
#define ADT7X10_STAT_T_HIGH (1 << 5)
#define ADT7X10_STAT_T_CRIT (1 << 6)
#define ADT7X10_STAT_NOT_RDY (1 << 7)
/*
* ADT7X10 config
*/
#define ADT7X10_FAULT_QUEUE_MASK (1 << 0 | 1 << 1)
#define ADT7X10_CT_POLARITY (1 << 2)
#define ADT7X10_INT_POLARITY (1 << 3)
#define ADT7X10_EVENT_MODE (1 << 4)
#define ADT7X10_MODE_MASK (1 << 5 | 1 << 6)
#define ADT7X10_FULL (0 << 5 | 0 << 6)
#define ADT7X10_PD (1 << 5 | 1 << 6)
#define ADT7X10_RESOLUTION (1 << 7)
/*
* ADT7X10 masks
*/
#define ADT7X10_T13_VALUE_MASK 0xFFF8
#define ADT7X10_T_HYST_MASK 0xF
/* straight from the datasheet */
#define ADT7X10_TEMP_MIN (-55000)
#define ADT7X10_TEMP_MAX 150000
/* Each client has this additional data */
struct adt7x10_data {
const struct adt7x10_ops *ops;
const char *name;
struct device *hwmon_dev;
struct mutex update_lock;
u8 config;
u8 oldconfig;
bool valid; /* true if registers valid */
unsigned long last_updated; /* In jiffies */
s16 temp[4]; /* Register values,
0 = input
1 = high
2 = low
3 = critical */
u8 hyst; /* hysteresis offset */
};
static int adt7x10_read_byte(struct device *dev, u8 reg)
{
struct adt7x10_data *d = dev_get_drvdata(dev);
return d->ops->read_byte(dev, reg);
}
static int adt7x10_write_byte(struct device *dev, u8 reg, u8 data)
{
struct adt7x10_data *d = dev_get_drvdata(dev);
return d->ops->write_byte(dev, reg, data);
}
static int adt7x10_read_word(struct device *dev, u8 reg)
{
struct adt7x10_data *d = dev_get_drvdata(dev);
return d->ops->read_word(dev, reg);
}
static int adt7x10_write_word(struct device *dev, u8 reg, u16 data)
{
struct adt7x10_data *d = dev_get_drvdata(dev);
return d->ops->write_word(dev, reg, data);
}
static const u8 ADT7X10_REG_TEMP[4] = {
ADT7X10_TEMPERATURE, /* input */
ADT7X10_T_ALARM_HIGH, /* high */
ADT7X10_T_ALARM_LOW, /* low */
ADT7X10_T_CRIT, /* critical */
};
static int adt7x10_temp_ready(struct device *dev)
{
int i, status;
for (i = 0; i < 6; i++) {
status = adt7x10_read_byte(dev, ADT7X10_STATUS);
if (status < 0)
return status;
if (!(status & ADT7X10_STAT_NOT_RDY))
return 0;
msleep(60);
}
return -ETIMEDOUT;
}
static int adt7x10_update_temp(struct device *dev)
{
struct adt7x10_data *data = dev_get_drvdata(dev);
int ret = 0;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
|| !data->valid) {
int temp;
dev_dbg(dev, "Starting update\n");
ret = adt7x10_temp_ready(dev); /* check for new value */
if (ret)
goto abort;
temp = adt7x10_read_word(dev, ADT7X10_REG_TEMP[0]);
if (temp < 0) {
ret = temp;
dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
ADT7X10_REG_TEMP[0], ret);
goto abort;
}
data->temp[0] = temp;
data->last_updated = jiffies;
data->valid = true;
}
abort:
mutex_unlock(&data->update_lock);
return ret;
}
static int adt7x10_fill_cache(struct device *dev)
{
struct adt7x10_data *data = dev_get_drvdata(dev);
int ret;
int i;
for (i = 1; i < ARRAY_SIZE(data->temp); i++) {
ret = adt7x10_read_word(dev, ADT7X10_REG_TEMP[i]);
if (ret < 0) {
dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
ADT7X10_REG_TEMP[i], ret);
return ret;
}
data->temp[i] = ret;
}
ret = adt7x10_read_byte(dev, ADT7X10_T_HYST);
if (ret < 0) {
dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
ADT7X10_T_HYST, ret);
return ret;
}
data->hyst = ret;
return 0;
}
static s16 ADT7X10_TEMP_TO_REG(long temp)
{
return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7X10_TEMP_MIN,
ADT7X10_TEMP_MAX) * 128, 1000);
}
static int ADT7X10_REG_TO_TEMP(struct adt7x10_data *data, s16 reg)
{
/* in 13 bit mode, bits 0-2 are status flags - mask them out */
if (!(data->config & ADT7X10_RESOLUTION))
reg &= ADT7X10_T13_VALUE_MASK;
/*
* temperature is stored in twos complement format, in steps of
* 1/128°C
*/
return DIV_ROUND_CLOSEST(reg * 1000, 128);
}
/*-----------------------------------------------------------------------*/
/* sysfs attributes for hwmon */
static ssize_t adt7x10_show_temp(struct device *dev,
struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct adt7x10_data *data = dev_get_drvdata(dev);
if (attr->index == 0) {
int ret;
ret = adt7x10_update_temp(dev);
if (ret)
return ret;
}
return sprintf(buf, "%d\n", ADT7X10_REG_TO_TEMP(data,
data->temp[attr->index]));
}
static ssize_t adt7x10_set_temp(struct device *dev,
struct device_attribute *da,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct adt7x10_data *data = dev_get_drvdata(dev);
int nr = attr->index;
long temp;
int ret;
ret = kstrtol(buf, 10, &temp);
if (ret)
return ret;
mutex_lock(&data->update_lock);
data->temp[nr] = ADT7X10_TEMP_TO_REG(temp);
ret = adt7x10_write_word(dev, ADT7X10_REG_TEMP[nr], data->temp[nr]);
if (ret)
count = ret;
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t adt7x10_show_t_hyst(struct device *dev,
struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct adt7x10_data *data = dev_get_drvdata(dev);
int nr = attr->index;
int hyst;
hyst = (data->hyst & ADT7X10_T_HYST_MASK) * 1000;
/*
* hysteresis is stored as a 4 bit offset in the device, convert it
* to an absolute value
*/
if (nr == 2) /* min has positive offset, others have negative */
hyst = -hyst;
return sprintf(buf, "%d\n",
ADT7X10_REG_TO_TEMP(data, data->temp[nr]) - hyst);
}
static ssize_t adt7x10_set_t_hyst(struct device *dev,
struct device_attribute *da,
const char *buf, size_t count)
{
struct adt7x10_data *data = dev_get_drvdata(dev);
int limit, ret;
long hyst;
ret = kstrtol(buf, 10, &hyst);
if (ret)
return ret;
/* convert absolute hysteresis value to a 4 bit delta value */
limit = ADT7X10_REG_TO_TEMP(data, data->temp[1]);
hyst = clamp_val(hyst, ADT7X10_TEMP_MIN, ADT7X10_TEMP_MAX);
data->hyst = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000),
0, ADT7X10_T_HYST_MASK);
ret = adt7x10_write_byte(dev, ADT7X10_T_HYST, data->hyst);
if (ret)
return ret;
return count;
}
static ssize_t adt7x10_show_alarm(struct device *dev,
struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
int ret;
ret = adt7x10_read_byte(dev, ADT7X10_STATUS);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", !!(ret & attr->index));
}
static ssize_t adt7x10_show_name(struct device *dev,
struct device_attribute *da,
char *buf)
{
struct adt7x10_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", data->name);
}
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adt7x10_show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
adt7x10_show_temp, adt7x10_set_temp, 1);
static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO,
adt7x10_show_temp, adt7x10_set_temp, 2);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO,
adt7x10_show_temp, adt7x10_set_temp, 3);
static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
adt7x10_show_t_hyst, adt7x10_set_t_hyst, 1);
static SENSOR_DEVICE_ATTR(temp1_min_hyst, S_IRUGO,
adt7x10_show_t_hyst, NULL, 2);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO,
adt7x10_show_t_hyst, NULL, 3);
static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, adt7x10_show_alarm,
NULL, ADT7X10_STAT_T_LOW);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adt7x10_show_alarm,
NULL, ADT7X10_STAT_T_HIGH);
static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, adt7x10_show_alarm,
NULL, ADT7X10_STAT_T_CRIT);
static DEVICE_ATTR(name, S_IRUGO, adt7x10_show_name, NULL);
static struct attribute *adt7x10_attributes[] = {
&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_crit.dev_attr.attr,
&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
&sensor_dev_attr_temp1_min_hyst.dev_attr.attr,
&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
NULL
};
static const struct attribute_group adt7x10_group = {
.attrs = adt7x10_attributes,
};
int adt7x10_probe(struct device *dev, const char *name,
const struct adt7x10_ops *ops)
{
struct adt7x10_data *data;
int ret;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->ops = ops;
data->name = name;
dev_set_drvdata(dev, data);
mutex_init(&data->update_lock);
/* configure as specified */
ret = adt7x10_read_byte(dev, ADT7X10_CONFIG);
if (ret < 0) {
dev_dbg(dev, "Can't read config? %d\n", ret);
return ret;
}
data->oldconfig = ret;
/*
* Set to 16 bit resolution, continous conversion and comparator mode.
*/
data->config = data->oldconfig;
data->config &= ~ADT7X10_MODE_MASK;
data->config |= ADT7X10_FULL | ADT7X10_RESOLUTION | ADT7X10_EVENT_MODE;
if (data->config != data->oldconfig) {
ret = adt7x10_write_byte(dev, ADT7X10_CONFIG, data->config);
if (ret)
return ret;
}
dev_dbg(dev, "Config %02x\n", data->config);
ret = adt7x10_fill_cache(dev);
if (ret)
goto exit_restore;
/* Register sysfs hooks */
ret = sysfs_create_group(&dev->kobj, &adt7x10_group);
if (ret)
goto exit_restore;
/*
* The I2C device will already have it's own 'name' attribute, but for
* the SPI device we need to register it. name will only be non NULL if
* the device doesn't register the 'name' attribute on its own.
*/
if (name) {
ret = device_create_file(dev, &dev_attr_name);
if (ret)
goto exit_remove;
}
data->hwmon_dev = hwmon_device_register(dev);
if (IS_ERR(data->hwmon_dev)) {
ret = PTR_ERR(data->hwmon_dev);
goto exit_remove_name;
}
return 0;
exit_remove_name:
if (name)
device_remove_file(dev, &dev_attr_name);
exit_remove:
sysfs_remove_group(&dev->kobj, &adt7x10_group);
exit_restore:
adt7x10_write_byte(dev, ADT7X10_CONFIG, data->oldconfig);
return ret;
}
EXPORT_SYMBOL_GPL(adt7x10_probe);
int adt7x10_remove(struct device *dev)
{
struct adt7x10_data *data = dev_get_drvdata(dev);
hwmon_device_unregister(data->hwmon_dev);
if (data->name)
device_remove_file(dev, &dev_attr_name);
sysfs_remove_group(&dev->kobj, &adt7x10_group);
if (data->oldconfig != data->config)
adt7x10_write_byte(dev, ADT7X10_CONFIG, data->oldconfig);
return 0;
}
EXPORT_SYMBOL_GPL(adt7x10_remove);
#ifdef CONFIG_PM_SLEEP
static int adt7x10_suspend(struct device *dev)
{
struct adt7x10_data *data = dev_get_drvdata(dev);
return adt7x10_write_byte(dev, ADT7X10_CONFIG,
data->config | ADT7X10_PD);
}
static int adt7x10_resume(struct device *dev)
{
struct adt7x10_data *data = dev_get_drvdata(dev);
return adt7x10_write_byte(dev, ADT7X10_CONFIG, data->config);
}
SIMPLE_DEV_PM_OPS(adt7x10_dev_pm_ops, adt7x10_suspend, adt7x10_resume);
EXPORT_SYMBOL_GPL(adt7x10_dev_pm_ops);
#endif /* CONFIG_PM_SLEEP */
MODULE_AUTHOR("Hartmut Knaack");
MODULE_DESCRIPTION("ADT7410/ADT7420, ADT7310/ADT7320 common code");
MODULE_LICENSE("GPL");

37
drivers/hwmon/adt7x10.h Normal file
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#ifndef __HWMON_ADT7X10_H__
#define __HWMON_ADT7X10_H__
#include <linux/types.h>
#include <linux/pm.h>
/* ADT7410 registers definition */
#define ADT7X10_TEMPERATURE 0
#define ADT7X10_STATUS 2
#define ADT7X10_CONFIG 3
#define ADT7X10_T_ALARM_HIGH 4
#define ADT7X10_T_ALARM_LOW 6
#define ADT7X10_T_CRIT 8
#define ADT7X10_T_HYST 0xA
#define ADT7X10_ID 0xB
struct device;
struct adt7x10_ops {
int (*read_byte)(struct device *, u8 reg);
int (*write_byte)(struct device *, u8 reg, u8 data);
int (*read_word)(struct device *, u8 reg);
int (*write_word)(struct device *, u8 reg, u16 data);
};
int adt7x10_probe(struct device *dev, const char *name,
const struct adt7x10_ops *ops);
int adt7x10_remove(struct device *dev);
#ifdef CONFIG_PM_SLEEP
extern const struct dev_pm_ops adt7x10_dev_pm_ops;
#define ADT7X10_DEV_PM_OPS (&adt7x10_dev_pm_ops)
#else
#define ADT7X10_DEV_PM_OPS NULL
#endif
#endif