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hwmon: Add driver for LM95234 

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2013-03-10 16:54:19 -07:00
parent a1fac92b8b
commit e1eb49063b
4 changed files with 816 additions and 0 deletions
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36
Documentation/hwmon/lm95234 Normal file
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@ -0,0 +1,36 @@
Kernel driver lm95234
=====================
Supported chips:
* National Semiconductor / Texas Instruments LM95234
Addresses scanned: I2C 0x18, 0x4d, 0x4e
Datasheet: Publicly available at the Texas Instruments website
http://www.ti.com/product/lm95234
Author: Guenter Roeck <linux@roeck-us.net>
Description
-----------
LM95234 is an 11-bit digital temperature sensor with a 2-wire System Management
Bus (SMBus) interface and TrueTherm technology that can very accurately monitor
the temperature of four remote diodes as well as its own temperature.
The four remote diodes can be external devices such as microprocessors,
graphics processors or diode-connected 2N3904s. The LM95234's TruTherm
beta compensation technology allows sensing of 90 nm or 65 nm process
thermal diodes accurately.
All temperature values are given in millidegrees Celsius. Temperature
is provided within a range of -127 to +255 degrees (+127.875 degrees for
the internal sensor). Resolution depends on temperature input and range.
Each sensor has its own maximum limit, but the hysteresis is common to all
channels. The hysteresis is configurable with the tem1_max_hyst attribute and
affects the hysteresis on all channels. The first two external sensors also
have a critical limit.
The lm95234 driver can change its update interval to a fixed set of values.
It will round up to the next selectable interval. See the datasheet for exact
values. Reading sensor values more often will do no harm, but will return
'old' values.

10
drivers/hwmon/Kconfig
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@ -771,6 +771,16 @@ config SENSORS_LTC4261
This driver can also be built as a module. If so, the module will
be called ltc4261.
config SENSORS_LM95234
tristate "National Semiconductor LM95234"
depends on I2C
help
If you say yes here you get support for the LM95234 temperature
sensor.
This driver can also be built as a module. If so, the module
will be called lm95234.
config SENSORS_LM95241
tristate "National Semiconductor LM95241 and compatibles"
depends on I2C

1
drivers/hwmon/Makefile
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@ -88,6 +88,7 @@ obj-$(CONFIG_SENSORS_LM87) += lm87.o
obj-$(CONFIG_SENSORS_LM90) += lm90.o
obj-$(CONFIG_SENSORS_LM92) += lm92.o
obj-$(CONFIG_SENSORS_LM93) += lm93.o
obj-$(CONFIG_SENSORS_LM95234) += lm95234.o
obj-$(CONFIG_SENSORS_LM95241) += lm95241.o
obj-$(CONFIG_SENSORS_LM95245) += lm95245.o
obj-$(CONFIG_SENSORS_LTC4151) += ltc4151.o

769
drivers/hwmon/lm95234.c Normal file
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/*
* Driver for Texas Instruments / National Semiconductor LM95234
*
* Copyright (c) 2013 Guenter Roeck <linux@roeck-us.net>
*
* Derived from lm95241.c
* Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.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.
*/
#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/sysfs.h>
#define DRVNAME "lm95234"
static const unsigned short normal_i2c[] = { 0x18, 0x4d, 0x4e, I2C_CLIENT_END };
/* LM95234 registers */
#define LM95234_REG_MAN_ID 0xFE
#define LM95234_REG_CHIP_ID 0xFF
#define LM95234_REG_STATUS 0x02
#define LM95234_REG_CONFIG 0x03
#define LM95234_REG_CONVRATE 0x04
#define LM95234_REG_STS_FAULT 0x07
#define LM95234_REG_STS_TCRIT1 0x08
#define LM95234_REG_STS_TCRIT2 0x09
#define LM95234_REG_TEMPH(x) ((x) + 0x10)
#define LM95234_REG_TEMPL(x) ((x) + 0x20)
#define LM95234_REG_UTEMPH(x) ((x) + 0x19) /* Remote only */
#define LM95234_REG_UTEMPL(x) ((x) + 0x29)
#define LM95234_REG_REM_MODEL 0x30
#define LM95234_REG_REM_MODEL_STS 0x38
#define LM95234_REG_OFFSET(x) ((x) + 0x31) /* Remote only */
#define LM95234_REG_TCRIT1(x) ((x) + 0x40)
#define LM95234_REG_TCRIT2(x) ((x) + 0x49) /* Remote channel 1,2 */
#define LM95234_REG_TCRIT_HYST 0x5a
#define NATSEMI_MAN_ID 0x01
#define LM95234_CHIP_ID 0x79
/* Client data (each client gets its own) */
struct lm95234_data {
struct device *hwmon_dev;
struct mutex update_lock;
unsigned long last_updated, interval; /* in jiffies */
bool valid; /* false until following fields are valid */
/* registers values */
int temp[5]; /* temperature (signed) */
u32 status; /* fault/alarm status */
u8 tcrit1[5]; /* critical temperature limit */
u8 tcrit2[2]; /* high temperature limit */
s8 toffset[4]; /* remote temperature offset */
u8 thyst; /* common hysteresis */
u8 sensor_type; /* temperature sensor type */
};
static int lm95234_read_temp(struct i2c_client *client, int index, int *t)
{
int val;
u16 temp = 0;
if (index) {
val = i2c_smbus_read_byte_data(client,
LM95234_REG_UTEMPH(index - 1));
if (val < 0)
return val;
temp = val << 8;
val = i2c_smbus_read_byte_data(client,
LM95234_REG_UTEMPL(index - 1));
if (val < 0)
return val;
temp |= val;
*t = temp;
}
/*
* Read signed temperature if unsigned temperature is 0,
* or if this is the local sensor.
*/
if (!temp) {
val = i2c_smbus_read_byte_data(client,
LM95234_REG_TEMPH(index));
if (val < 0)
return val;
temp = val << 8;
val = i2c_smbus_read_byte_data(client,
LM95234_REG_TEMPL(index));
if (val < 0)
return val;
temp |= val;
*t = (s16)temp;
}
return 0;
}
static u16 update_intervals[] = { 143, 364, 1000, 2500 };
/* Fill value cache. Must be called with update lock held. */
static int lm95234_fill_cache(struct i2c_client *client)
{
struct lm95234_data *data = i2c_get_clientdata(client);
int i, ret;
ret = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE);
if (ret < 0)
return ret;
data->interval = msecs_to_jiffies(update_intervals[ret & 0x03]);
for (i = 0; i < ARRAY_SIZE(data->tcrit1); i++) {
ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT1(i));
if (ret < 0)
return ret;
data->tcrit1[i] = ret;
}
for (i = 0; i < ARRAY_SIZE(data->tcrit2); i++) {
ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT2(i));
if (ret < 0)
return ret;
data->tcrit2[i] = ret;
}
for (i = 0; i < ARRAY_SIZE(data->toffset); i++) {
ret = i2c_smbus_read_byte_data(client, LM95234_REG_OFFSET(i));
if (ret < 0)
return ret;
data->toffset[i] = ret;
}
ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT_HYST);
if (ret < 0)
return ret;
data->thyst = ret;
ret = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
if (ret < 0)
return ret;
data->sensor_type = ret;
return 0;
}
static int lm95234_update_device(struct i2c_client *client,
struct lm95234_data *data)
{
int ret;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + data->interval) ||
!data->valid) {
int i;
if (!data->valid) {
ret = lm95234_fill_cache(client);
if (ret < 0)
goto abort;
}
data->valid = false;
for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
ret = lm95234_read_temp(client, i, &data->temp[i]);
if (ret < 0)
goto abort;
}
ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_FAULT);
if (ret < 0)
goto abort;
data->status = ret;
ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT1);
if (ret < 0)
goto abort;
data->status |= ret << 8;
ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT2);
if (ret < 0)
goto abort;
data->status |= ret << 16;
data->last_updated = jiffies;
data->valid = true;
}
ret = 0;
abort:
mutex_unlock(&data->update_lock);
return ret;
}
static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm95234_data *data = i2c_get_clientdata(client);
int index = to_sensor_dev_attr(attr)->index;
int ret = lm95234_update_device(client, data);
if (ret)
return ret;
return sprintf(buf, "%d\n",
DIV_ROUND_CLOSEST(data->temp[index] * 125, 32));
}
static ssize_t show_alarm(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm95234_data *data = i2c_get_clientdata(client);
u32 mask = to_sensor_dev_attr(attr)->index;
int ret = lm95234_update_device(client, data);
if (ret)
return ret;
return sprintf(buf, "%u", !!(data->status & mask));
}
static ssize_t show_type(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm95234_data *data = i2c_get_clientdata(client);
u8 mask = to_sensor_dev_attr(attr)->index;
int ret = lm95234_update_device(client, data);
if (ret)
return ret;
return sprintf(buf, data->sensor_type & mask ? "1\n" : "2\n");
}
static ssize_t set_type(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm95234_data *data = i2c_get_clientdata(client);
unsigned long val;
u8 mask = to_sensor_dev_attr(attr)->index;
int ret = lm95234_update_device(client, data);
if (ret)
return ret;
ret = kstrtoul(buf, 10, &val);
if (ret < 0)
return ret;
if (val != 1 && val != 2)
return -EINVAL;
mutex_lock(&data->update_lock);
if (val == 1)
data->sensor_type |= mask;
else
data->sensor_type &= ~mask;
data->valid = false;
i2c_smbus_write_byte_data(client, LM95234_REG_REM_MODEL,
data->sensor_type);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_tcrit2(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm95234_data *data = i2c_get_clientdata(client);
int index = to_sensor_dev_attr(attr)->index;
int ret = lm95234_update_device(client, data);
if (ret)
return ret;
return sprintf(buf, "%u", data->tcrit2[index] * 1000);
}
static ssize_t set_tcrit2(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm95234_data *data = i2c_get_clientdata(client);
int index = to_sensor_dev_attr(attr)->index;
long val;
int ret = lm95234_update_device(client, data);
if (ret)
return ret;
ret = kstrtol(buf, 10, &val);
if (ret < 0)
return ret;
val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, index ? 255 : 127);
mutex_lock(&data->update_lock);
data->tcrit2[index] = val;
i2c_smbus_write_byte_data(client, LM95234_REG_TCRIT2(index), val);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_tcrit2_hyst(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm95234_data *data = i2c_get_clientdata(client);
int index = to_sensor_dev_attr(attr)->index;
int ret = lm95234_update_device(client, data);
if (ret)
return ret;
/* Result can be negative, so be careful with unsigned operands */
return sprintf(buf, "%d",
((int)data->tcrit2[index] - (int)data->thyst) * 1000);
}
static ssize_t show_tcrit1(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm95234_data *data = i2c_get_clientdata(client);
int index = to_sensor_dev_attr(attr)->index;
return sprintf(buf, "%u", data->tcrit1[index] * 1000);
}
static ssize_t set_tcrit1(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm95234_data *data = i2c_get_clientdata(client);
int index = to_sensor_dev_attr(attr)->index;
long val;
int ret = lm95234_update_device(client, data);
if (ret)
return ret;
ret = kstrtol(buf, 10, &val);
if (ret < 0)
return ret;
val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 255);
mutex_lock(&data->update_lock);
data->tcrit1[index] = val;
i2c_smbus_write_byte_data(client, LM95234_REG_TCRIT1(index), val);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_tcrit1_hyst(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm95234_data *data = i2c_get_clientdata(client);
int index = to_sensor_dev_attr(attr)->index;
int ret = lm95234_update_device(client, data);
if (ret)
return ret;
/* Result can be negative, so be careful with unsigned operands */
return sprintf(buf, "%d",
((int)data->tcrit1[index] - (int)data->thyst) * 1000);
}
static ssize_t set_tcrit1_hyst(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm95234_data *data = i2c_get_clientdata(client);
int index = to_sensor_dev_attr(attr)->index;
long val;
int ret = lm95234_update_device(client, data);
if (ret)
return ret;
ret = kstrtol(buf, 10, &val);
if (ret < 0)
return ret;
val = DIV_ROUND_CLOSEST(val, 1000);
val = clamp_val((int)data->tcrit1[index] - val, 0, 31);
mutex_lock(&data->update_lock);
data->thyst = val;
i2c_smbus_write_byte_data(client, LM95234_REG_TCRIT_HYST, val);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_offset(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm95234_data *data = i2c_get_clientdata(client);
int index = to_sensor_dev_attr(attr)->index;
int ret = lm95234_update_device(client, data);
if (ret)
return ret;
return sprintf(buf, "%d", data->toffset[index] * 500);
}
static ssize_t set_offset(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm95234_data *data = i2c_get_clientdata(client);
int index = to_sensor_dev_attr(attr)->index;
long val;
int ret = lm95234_update_device(client, data);
if (ret)
return ret;
ret = kstrtol(buf, 10, &val);
if (ret < 0)
return ret;
/* Accuracy is 1/2 degrees C */
val = clamp_val(DIV_ROUND_CLOSEST(val, 500), -128, 127);
mutex_lock(&data->update_lock);
data->toffset[index] = val;
i2c_smbus_write_byte_data(client, LM95234_REG_OFFSET(index), val);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm95234_data *data = i2c_get_clientdata(client);
int ret = lm95234_update_device(client, data);
if (ret)
return ret;
return sprintf(buf, "%lu\n",
DIV_ROUND_CLOSEST(data->interval * 1000, HZ));
}
static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm95234_data *data = i2c_get_clientdata(client);
unsigned long val;
u8 regval;
int ret = lm95234_update_device(client, data);
if (ret)
return ret;
ret = kstrtoul(buf, 10, &val);
if (ret < 0)
return ret;
for (regval = 0; regval < 3; regval++) {
if (val <= update_intervals[regval])
break;
}
mutex_lock(&data->update_lock);
data->interval = msecs_to_jiffies(update_intervals[regval]);
i2c_smbus_write_byte_data(client, LM95234_REG_CONVRATE, regval);
mutex_unlock(&data->update_lock);
return count;
}
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL,
BIT(0) | BIT(1));
static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL,
BIT(2) | BIT(3));
static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL,
BIT(4) | BIT(5));
static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL,
BIT(6) | BIT(7));
static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type,
BIT(1));
static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR | S_IRUGO, show_type, set_type,
BIT(2));
static SENSOR_DEVICE_ATTR(temp4_type, S_IWUSR | S_IRUGO, show_type, set_type,
BIT(3));
static SENSOR_DEVICE_ATTR(temp5_type, S_IWUSR | S_IRUGO, show_type, set_type,
BIT(4));
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_tcrit1,
set_tcrit1, 0);
static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_tcrit2,
set_tcrit2, 0);
static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_tcrit2,
set_tcrit2, 1);
static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_tcrit1,
set_tcrit1, 3);
static SENSOR_DEVICE_ATTR(temp5_max, S_IWUSR | S_IRUGO, show_tcrit1,
set_tcrit1, 4);
static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_tcrit1_hyst,
set_tcrit1_hyst, 0);
static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IRUGO, show_tcrit2_hyst, NULL, 0);
static SENSOR_DEVICE_ATTR(temp3_max_hyst, S_IRUGO, show_tcrit2_hyst, NULL, 1);
static SENSOR_DEVICE_ATTR(temp4_max_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_max_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 4);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
BIT(0 + 8));
static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL,
BIT(1 + 16));
static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL,
BIT(2 + 16));
static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL,
BIT(3 + 8));
static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL,
BIT(4 + 8));
static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_tcrit1,
set_tcrit1, 1);
static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_tcrit1,
set_tcrit1, 2);
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 2);
static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
BIT(1 + 8));
static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL,
BIT(2 + 8));
static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_offset,
set_offset, 0);
static SENSOR_DEVICE_ATTR(temp3_offset, S_IWUSR | S_IRUGO, show_offset,
set_offset, 1);
static SENSOR_DEVICE_ATTR(temp4_offset, S_IWUSR | S_IRUGO, show_offset,
set_offset, 2);
static SENSOR_DEVICE_ATTR(temp5_offset, S_IWUSR | S_IRUGO, show_offset,
set_offset, 3);
static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval,
set_interval);
static struct attribute *lm95234_attributes[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp3_input.dev_attr.attr,
&sensor_dev_attr_temp4_input.dev_attr.attr,
&sensor_dev_attr_temp5_input.dev_attr.attr,
&sensor_dev_attr_temp2_fault.dev_attr.attr,
&sensor_dev_attr_temp3_fault.dev_attr.attr,
&sensor_dev_attr_temp4_fault.dev_attr.attr,
&sensor_dev_attr_temp5_fault.dev_attr.attr,
&sensor_dev_attr_temp2_type.dev_attr.attr,
&sensor_dev_attr_temp3_type.dev_attr.attr,
&sensor_dev_attr_temp4_type.dev_attr.attr,
&sensor_dev_attr_temp5_type.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp3_max.dev_attr.attr,
&sensor_dev_attr_temp4_max.dev_attr.attr,
&sensor_dev_attr_temp5_max.dev_attr.attr,
&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
&sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
&sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
&sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_crit.dev_attr.attr,
&sensor_dev_attr_temp3_crit.dev_attr.attr,
&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_offset.dev_attr.attr,
&sensor_dev_attr_temp3_offset.dev_attr.attr,
&sensor_dev_attr_temp4_offset.dev_attr.attr,
&sensor_dev_attr_temp5_offset.dev_attr.attr,
&dev_attr_update_interval.attr,
NULL
};
static const struct attribute_group lm95234_group = {
.attrs = lm95234_attributes,
};
static int lm95234_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
int mfg_id, chip_id, val;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
mfg_id = i2c_smbus_read_byte_data(client, LM95234_REG_MAN_ID);
if (mfg_id != NATSEMI_MAN_ID)
return -ENODEV;
chip_id = i2c_smbus_read_byte_data(client, LM95234_REG_CHIP_ID);
if (chip_id != LM95234_CHIP_ID)
return -ENODEV;
val = i2c_smbus_read_byte_data(client, LM95234_REG_STATUS);
if (val & 0x30)
return -ENODEV;
val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);
if (val & 0xbc)
return -ENODEV;
val = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE);
if (val & 0xfc)
return -ENODEV;
val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
if (val & 0xe1)
return -ENODEV;
val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);
if (val & 0xe1)
return -ENODEV;
strlcpy(info->type, "lm95234", I2C_NAME_SIZE);
return 0;
}
static int lm95234_init_client(struct i2c_client *client)
{
int val, model;
/* start conversion if necessary */
val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);
if (val < 0)
return val;
if (val & 0x40)
i2c_smbus_write_byte_data(client, LM95234_REG_CONFIG,
val & ~0x40);
/* If diode type status reports an error, try to fix it */
val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);
if (val < 0)
return val;
model = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
if (model < 0)
return model;
if (model & val) {
dev_notice(&client->dev,
"Fixing remote diode type misconfiguration (0x%x)\n",
val);
i2c_smbus_write_byte_data(client, LM95234_REG_REM_MODEL,
model & ~val);
}
return 0;
}
static int lm95234_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct lm95234_data *data;
int err;
data = devm_kzalloc(dev, sizeof(struct lm95234_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
/* Initialize the LM95234 chip */
err = lm95234_init_client(client);
if (err < 0)
return err;
/* Register sysfs hooks */
err = sysfs_create_group(&dev->kobj, &lm95234_group);
if (err)
return err;
data->hwmon_dev = hwmon_device_register(dev);
if (IS_ERR(data->hwmon_dev)) {
err = PTR_ERR(data->hwmon_dev);
goto exit_remove_files;
}
return 0;
exit_remove_files:
sysfs_remove_group(&dev->kobj, &lm95234_group);
return err;
}
static int lm95234_remove(struct i2c_client *client)
{
struct lm95234_data *data = i2c_get_clientdata(client);
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &lm95234_group);
return 0;
}
/* Driver data (common to all clients) */
static const struct i2c_device_id lm95234_id[] = {
{ "lm95234", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm95234_id);
static struct i2c_driver lm95234_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = DRVNAME,
},
.probe = lm95234_probe,
.remove = lm95234_remove,
.id_table = lm95234_id,
.detect = lm95234_detect,
.address_list = normal_i2c,
};
module_i2c_driver(lm95234_driver);
MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
MODULE_DESCRIPTION("LM95234 sensor driver");
MODULE_LICENSE("GPL");