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Hi,
We are looking for a compatible Linux Device Driver for the TMP435 temperature sensor. We haven't found a compatible one in current upstream Linux kernel, and google didn't return any more information.
Could you please let us know where such a driver could be found, or if this component is fully compatible with an existing family (e.g. TMP401/411/431/432, TMP421/422/423, TMP102).
Thank you,
Patrick.
Hello Patrick,
There is no driver specifically written for TMP435. However, you can use the TMP401 driver that's available in the Kernel (www.kernel.org). As long the I2C slave address of TMP435 is set to '1001100' i.e. With both A0, A1 pins connected to GND you should be able to communicate with TMP435 without any issues. Also, the register map settings for TMP435 and TMP401 and similar so you may change the settings if necessary.
Attached is the TMP401 driver for your reference. Hope this helps!
/* tmp401.c
*
* Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com>
* Preliminary tmp411 support by:
* Gabriel Konat, Sander Leget, Wouter Willems
* Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de>
*
* Cleanup and support for TMP431 and TMP432 by Guenter Roeck
* Copyright (c) 2013 Guenter Roeck <linux@roeck-us.net>
*
* 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.
*/
/*
* Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.
*
* Note this IC is in some aspect similar to the LM90, but it has quite a
* few differences too, for example the local temp has a higher resolution
* and thus has 16 bits registers for its value and limit instead of 8 bits.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/bitops.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>
/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
enum chips { tmp401, tmp411, tmp431, tmp432 };
/*
* The TMP401 registers, note some registers have different addresses for
* reading and writing
*/
#define TMP401_STATUS 0x02
#define TMP401_CONFIG_READ 0x03
#define TMP401_CONFIG_WRITE 0x09
#define TMP401_CONVERSION_RATE_READ 0x04
#define TMP401_CONVERSION_RATE_WRITE 0x0A
#define TMP401_TEMP_CRIT_HYST 0x21
#define TMP401_MANUFACTURER_ID_REG 0xFE
#define TMP401_DEVICE_ID_REG 0xFF
static const u8 TMP401_TEMP_MSB_READ[6][2] = {
{ 0x00, 0x01 }, /* temp */
{ 0x06, 0x08 }, /* low limit */
{ 0x05, 0x07 }, /* high limit */
{ 0x20, 0x19 }, /* therm (crit) limit */
{ 0x30, 0x34 }, /* lowest */
{ 0x32, 0x36 }, /* highest */
};
static const u8 TMP401_TEMP_MSB_WRITE[6][2] = {
{ 0, 0 }, /* temp (unused) */
{ 0x0C, 0x0E }, /* low limit */
{ 0x0B, 0x0D }, /* high limit */
{ 0x20, 0x19 }, /* therm (crit) limit */
{ 0x30, 0x34 }, /* lowest */
{ 0x32, 0x36 }, /* highest */
};
static const u8 TMP401_TEMP_LSB[6][2] = {
{ 0x15, 0x10 }, /* temp */
{ 0x17, 0x14 }, /* low limit */
{ 0x16, 0x13 }, /* high limit */
{ 0, 0 }, /* therm (crit) limit (unused) */
{ 0x31, 0x35 }, /* lowest */
{ 0x33, 0x37 }, /* highest */
};
static const u8 TMP432_TEMP_MSB_READ[4][3] = {
{ 0x00, 0x01, 0x23 }, /* temp */
{ 0x06, 0x08, 0x16 }, /* low limit */
{ 0x05, 0x07, 0x15 }, /* high limit */
{ 0x20, 0x19, 0x1A }, /* therm (crit) limit */
};
static const u8 TMP432_TEMP_MSB_WRITE[4][3] = {
{ 0, 0, 0 }, /* temp - unused */
{ 0x0C, 0x0E, 0x16 }, /* low limit */
{ 0x0B, 0x0D, 0x15 }, /* high limit */
{ 0x20, 0x19, 0x1A }, /* therm (crit) limit */
};
static const u8 TMP432_TEMP_LSB[3][3] = {
{ 0x29, 0x10, 0x24 }, /* temp */
{ 0x3E, 0x14, 0x18 }, /* low limit */
{ 0x3D, 0x13, 0x17 }, /* high limit */
};
/* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
static const u8 TMP432_STATUS_REG[] = {
0x1b, 0x36, 0x35, 0x37 };
/* Flags */
#define TMP401_CONFIG_RANGE BIT(2)
#define TMP401_CONFIG_SHUTDOWN BIT(6)
#define TMP401_STATUS_LOCAL_CRIT BIT(0)
#define TMP401_STATUS_REMOTE_CRIT BIT(1)
#define TMP401_STATUS_REMOTE_OPEN BIT(2)
#define TMP401_STATUS_REMOTE_LOW BIT(3)
#define TMP401_STATUS_REMOTE_HIGH BIT(4)
#define TMP401_STATUS_LOCAL_LOW BIT(5)
#define TMP401_STATUS_LOCAL_HIGH BIT(6)
/* On TMP432, each status has its own register */
#define TMP432_STATUS_LOCAL BIT(0)
#define TMP432_STATUS_REMOTE1 BIT(1)
#define TMP432_STATUS_REMOTE2 BIT(2)
/* Manufacturer / Device ID's */
#define TMP401_MANUFACTURER_ID 0x55
#define TMP401_DEVICE_ID 0x11
#define TMP411A_DEVICE_ID 0x12
#define TMP411B_DEVICE_ID 0x13
#define TMP411C_DEVICE_ID 0x10
#define TMP431_DEVICE_ID 0x31
#define TMP432_DEVICE_ID 0x32
/*
* Driver data (common to all clients)
*/
static const struct i2c_device_id tmp401_id[] = {
{ "tmp401", tmp401 },
{ "tmp411", tmp411 },
{ "tmp431", tmp431 },
{ "tmp432", tmp432 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tmp401_id);
/*
* Client data (each client gets its own)
*/
struct tmp401_data {
struct i2c_client *client;
const struct attribute_group *groups[3];
struct mutex update_lock;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
enum chips kind;
unsigned int update_interval; /* in milliseconds */
/* register values */
u8 status[4];
u8 config;
u16 temp[6][3];
u8 temp_crit_hyst;
};
/*
* Sysfs attr show / store functions
*/
static int tmp401_register_to_temp(u16 reg, u8 config)
{
int temp = reg;
if (config & TMP401_CONFIG_RANGE)
temp -= 64 * 256;
return DIV_ROUND_CLOSEST(temp * 125, 32);
}
static u16 tmp401_temp_to_register(long temp, u8 config, int zbits)
{
if (config & TMP401_CONFIG_RANGE) {
temp = clamp_val(temp, -64000, 191000);
temp += 64000;
} else
temp = clamp_val(temp, 0, 127000);
return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
}
static int tmp401_update_device_reg16(struct i2c_client *client,
struct tmp401_data *data)
{
int i, j, val;
int num_regs = data->kind == tmp411 ? 6 : 4;
int num_sensors = data->kind == tmp432 ? 3 : 2;
for (i = 0; i < num_sensors; i++) { /* local / r1 / r2 */
for (j = 0; j < num_regs; j++) { /* temp / low / ... */
u8 regaddr;
/*
* High byte must be read first immediately followed
* by the low byte
*/
regaddr = data->kind == tmp432 ?
TMP432_TEMP_MSB_READ[j][i] :
TMP401_TEMP_MSB_READ[j][i];
val = i2c_smbus_read_byte_data(client, regaddr);
if (val < 0)
return val;
data->temp[j][i] = val << 8;
if (j == 3) /* crit is msb only */
continue;
regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[j][i]
: TMP401_TEMP_LSB[j][i];
val = i2c_smbus_read_byte_data(client, regaddr);
if (val < 0)
return val;
data->temp[j][i] |= val;
}
}
return 0;
}
static struct tmp401_data *tmp401_update_device(struct device *dev)
{
struct tmp401_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
struct tmp401_data *ret = data;
int i, val;
unsigned long next_update;
mutex_lock(&data->update_lock);
next_update = data->last_updated +
msecs_to_jiffies(data->update_interval);
if (time_after(jiffies, next_update) || !data->valid) {
if (data->kind != tmp432) {
/*
* The driver uses the TMP432 status format internally.
* Convert status to TMP432 format for other chips.
*/
val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
if (val < 0) {
ret = ERR_PTR(val);
goto abort;
}
data->status[0] =
(val & TMP401_STATUS_REMOTE_OPEN) >> 1;
data->status[1] =
((val & TMP401_STATUS_REMOTE_LOW) >> 2) |
((val & TMP401_STATUS_LOCAL_LOW) >> 5);
data->status[2] =
((val & TMP401_STATUS_REMOTE_HIGH) >> 3) |
((val & TMP401_STATUS_LOCAL_HIGH) >> 6);
data->status[3] = val & (TMP401_STATUS_LOCAL_CRIT
| TMP401_STATUS_REMOTE_CRIT);
} else {
for (i = 0; i < ARRAY_SIZE(data->status); i++) {
val = i2c_smbus_read_byte_data(client,
TMP432_STATUS_REG[i]);
if (val < 0) {
ret = ERR_PTR(val);
goto abort;
}
data->status[i] = val;
}
}
val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
if (val < 0) {
ret = ERR_PTR(val);
goto abort;
}
data->config = val;
val = tmp401_update_device_reg16(client, data);
if (val < 0) {
ret = ERR_PTR(val);
goto abort;
}
val = i2c_smbus_read_byte_data(client, TMP401_TEMP_CRIT_HYST);
if (val < 0) {
ret = ERR_PTR(val);
goto abort;
}
data->temp_crit_hyst = val;
data->last_updated = jiffies;
data->valid = 1;
}
abort:
mutex_unlock(&data->update_lock);
return ret;
}
static ssize_t show_temp(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int nr = to_sensor_dev_attr_2(devattr)->nr;
int index = to_sensor_dev_attr_2(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%d\n",
tmp401_register_to_temp(data->temp[nr][index], data->config));
}
static ssize_t show_temp_crit_hyst(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int temp, index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
mutex_lock(&data->update_lock);
temp = tmp401_register_to_temp(data->temp[3][index], data->config);
temp -= data->temp_crit_hyst * 1000;
mutex_unlock(&data->update_lock);
return sprintf(buf, "%d\n", temp);
}
static ssize_t show_status(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int nr = to_sensor_dev_attr_2(devattr)->nr;
int mask = to_sensor_dev_attr_2(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%d\n", !!(data->status[nr] & mask));
}
static ssize_t store_temp(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
int nr = to_sensor_dev_attr_2(devattr)->nr;
int index = to_sensor_dev_attr_2(devattr)->index;
struct tmp401_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
long val;
u16 reg;
u8 regaddr;
if (kstrtol(buf, 10, &val))
return -EINVAL;
reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);
mutex_lock(&data->update_lock);
regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
: TMP401_TEMP_MSB_WRITE[nr][index];
i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
if (nr != 3) {
regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[nr][index]
: TMP401_TEMP_LSB[nr][index];
i2c_smbus_write_byte_data(client, regaddr, reg & 0xFF);
}
data->temp[nr][index] = reg;
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
*devattr, const char *buf, size_t count)
{
int temp, index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
long val;
u8 reg;
if (IS_ERR(data))
return PTR_ERR(data);
if (kstrtol(buf, 10, &val))
return -EINVAL;
if (data->config & TMP401_CONFIG_RANGE)
val = clamp_val(val, -64000, 191000);
else
val = clamp_val(val, 0, 127000);
mutex_lock(&data->update_lock);
temp = tmp401_register_to_temp(data->temp[3][index], data->config);
val = clamp_val(val, temp - 255000, temp);
reg = ((temp - val) + 500) / 1000;
i2c_smbus_write_byte_data(data->client, TMP401_TEMP_CRIT_HYST,
reg);
data->temp_crit_hyst = reg;
mutex_unlock(&data->update_lock);
return count;
}
/*
* Resets the historical measurements of minimum and maximum temperatures.
* This is done by writing any value to any of the minimum/maximum registers
* (0x30-0x37).
*/
static ssize_t reset_temp_history(struct device *dev,
struct device_attribute *devattr, const char *buf, size_t count)
{
struct tmp401_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
long val;
if (kstrtol(buf, 10, &val))
return -EINVAL;
if (val != 1) {
dev_err(dev,
"temp_reset_history value %ld not supported. Use 1 to reset the history!\n",
val);
return -EINVAL;
}
mutex_lock(&data->update_lock);
i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
data->valid = 0;
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_update_interval(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct tmp401_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%u\n", data->update_interval);
}
static ssize_t set_update_interval(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct tmp401_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
unsigned long val;
int err, rate;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
/*
* For valid rates, interval can be calculated as
* interval = (1 << (7 - rate)) * 125;
* Rounded rate is therefore
* rate = 7 - __fls(interval * 4 / (125 * 3));
* Use clamp_val() to avoid overflows, and to ensure valid input
* for __fls.
*/
val = clamp_val(val, 125, 16000);
rate = 7 - __fls(val * 4 / (125 * 3));
mutex_lock(&data->update_lock);
i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, rate);
data->update_interval = (1 << (7 - rate)) * 125;
mutex_unlock(&data->update_lock);
return count;
}
static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
static SENSOR_DEVICE_ATTR_2(temp1_min, S_IWUSR | S_IRUGO, show_temp,
store_temp, 1, 0);
static SENSOR_DEVICE_ATTR_2(temp1_max, S_IWUSR | S_IRUGO, show_temp,
store_temp, 2, 0);
static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IWUSR | S_IRUGO, show_temp,
store_temp, 3, 0);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO,
show_temp_crit_hyst, store_temp_crit_hyst, 0);
static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_status, NULL,
1, TMP432_STATUS_LOCAL);
static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_status, NULL,
2, TMP432_STATUS_LOCAL);
static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_status, NULL,
3, TMP432_STATUS_LOCAL);
static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp,
store_temp, 1, 1);
static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp,
store_temp, 2, 1);
static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IWUSR | S_IRUGO, show_temp,
store_temp, 3, 1);
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst,
NULL, 1);
static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_status, NULL,
0, TMP432_STATUS_REMOTE1);
static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_status, NULL,
1, TMP432_STATUS_REMOTE1);
static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_status, NULL,
2, TMP432_STATUS_REMOTE1);
static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_status, NULL,
3, TMP432_STATUS_REMOTE1);
static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
set_update_interval);
static struct attribute *tmp401_attributes[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp1_min.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp1_crit.dev_attr.attr,
&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp2_min.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp2_crit.dev_attr.attr,
&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
&sensor_dev_attr_temp2_fault.dev_attr.attr,
&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
&dev_attr_update_interval.attr,
NULL
};
static const struct attribute_group tmp401_group = {
.attrs = tmp401_attributes,
};
/*
* Additional features of the TMP411 chip.
* The TMP411 stores the minimum and maximum
* temperature measured since power-on, chip-reset, or
* minimum and maximum register reset for both the local
* and remote channels.
*/
static SENSOR_DEVICE_ATTR_2(temp1_lowest, S_IRUGO, show_temp, NULL, 4, 0);
static SENSOR_DEVICE_ATTR_2(temp1_highest, S_IRUGO, show_temp, NULL, 5, 0);
static SENSOR_DEVICE_ATTR_2(temp2_lowest, S_IRUGO, show_temp, NULL, 4, 1);
static SENSOR_DEVICE_ATTR_2(temp2_highest, S_IRUGO, show_temp, NULL, 5, 1);
static SENSOR_DEVICE_ATTR(temp_reset_history, S_IWUSR, NULL, reset_temp_history,
0);
static struct attribute *tmp411_attributes[] = {
&sensor_dev_attr_temp1_highest.dev_attr.attr,
&sensor_dev_attr_temp1_lowest.dev_attr.attr,
&sensor_dev_attr_temp2_highest.dev_attr.attr,
&sensor_dev_attr_temp2_lowest.dev_attr.attr,
&sensor_dev_attr_temp_reset_history.dev_attr.attr,
NULL
};
static const struct attribute_group tmp411_group = {
.attrs = tmp411_attributes,
};
static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0, 2);
static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp,
store_temp, 1, 2);
static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp,
store_temp, 2, 2);
static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
store_temp, 3, 2);
static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temp_crit_hyst,
NULL, 2);
static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_status, NULL,
0, TMP432_STATUS_REMOTE2);
static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_status, NULL,
1, TMP432_STATUS_REMOTE2);
static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_status, NULL,
2, TMP432_STATUS_REMOTE2);
static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_status, NULL,
3, TMP432_STATUS_REMOTE2);
static struct attribute *tmp432_attributes[] = {
&sensor_dev_attr_temp3_input.dev_attr.attr,
&sensor_dev_attr_temp3_min.dev_attr.attr,
&sensor_dev_attr_temp3_max.dev_attr.attr,
&sensor_dev_attr_temp3_crit.dev_attr.attr,
&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
&sensor_dev_attr_temp3_fault.dev_attr.attr,
&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
NULL
};
static const struct attribute_group tmp432_group = {
.attrs = tmp432_attributes,
};
/*
* Begin non sysfs callback code (aka Real code)
*/
static void tmp401_init_client(struct tmp401_data *data,
struct i2c_client *client)
{
int config, config_orig;
/* Set the conversion rate to 2 Hz */
i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
data->update_interval = 500;
/* Start conversions (disable shutdown if necessary) */
config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
if (config < 0) {
dev_warn(&client->dev, "Initialization failed!\n");
return;
}
config_orig = config;
config &= ~TMP401_CONFIG_SHUTDOWN;
if (config != config_orig)
i2c_smbus_write_byte_data(client, TMP401_CONFIG_WRITE, config);
}
static int tmp401_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
enum chips kind;
struct i2c_adapter *adapter = client->adapter;
u8 reg;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
/* Detect and identify the chip */
reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
if (reg != TMP401_MANUFACTURER_ID)
return -ENODEV;
reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
switch (reg) {
case TMP401_DEVICE_ID:
if (client->addr != 0x4c)
return -ENODEV;
kind = tmp401;
break;
case TMP411A_DEVICE_ID:
if (client->addr != 0x4c)
return -ENODEV;
kind = tmp411;
break;
case TMP411B_DEVICE_ID:
if (client->addr != 0x4d)
return -ENODEV;
kind = tmp411;
break;
case TMP411C_DEVICE_ID:
if (client->addr != 0x4e)
return -ENODEV;
kind = tmp411;
break;
case TMP431_DEVICE_ID:
if (client->addr == 0x4e)
return -ENODEV;
kind = tmp431;
break;
case TMP432_DEVICE_ID:
if (client->addr == 0x4e)
return -ENODEV;
kind = tmp432;
break;
default:
return -ENODEV;
}
reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
if (reg & 0x1b)
return -ENODEV;
reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
/* Datasheet says: 0x1-0x6 */
if (reg > 15)
return -ENODEV;
strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
return 0;
}
static int tmp401_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
const char *names[] = { "TMP401", "TMP411", "TMP431", "TMP432" };
struct device *dev = &client->dev;
struct device *hwmon_dev;
struct tmp401_data *data;
int groups = 0;
data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->client = client;
mutex_init(&data->update_lock);
data->kind = id->driver_data;
/* Initialize the TMP401 chip */
tmp401_init_client(data, client);
/* Register sysfs hooks */
data->groups[groups++] = &tmp401_group;
/* Register additional tmp411 sysfs hooks */
if (data->kind == tmp411)
data->groups[groups++] = &tmp411_group;
/* Register additional tmp432 sysfs hooks */
if (data->kind == tmp432)
data->groups[groups++] = &tmp432_group;
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
data, data->groups);
if (IS_ERR(hwmon_dev))
return PTR_ERR(hwmon_dev);
dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
return 0;
}
static struct i2c_driver tmp401_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "tmp401",
},
.probe = tmp401_probe,
.id_table = tmp401_id,
.detect = tmp401_detect,
.address_list = normal_i2c,
};
module_i2c_driver(tmp401_driver);
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
MODULE_LICENSE("GPL");
Best Regards,
Abhi
Thanks a lot Abhishek for your quick and clear answer.
By the way, does TI maintain somewhere some sort of compliancy table for TMPxx device driver families?
Best Regards,
Patrick.
You are welcome Patrick.
Regarding the compliance I'm afraid we do not. But feel free to ask us if you have any question on TMPXX device specifications. Out of curiosity, whats your target application for TMP435?
Thanks,
Abhi
Hi,
This is to do external thermal measurement capability for an existing HW.
Thanks again.
Patrick.