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linux/drivers/hwmon/lm95234.c

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hwmon: Add driver for LM95234 Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2013-03-10 16:54:19 -07:00
/*
* 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");
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