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hwmon: (lm95245) Add support for LM95235

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LM95235 is register compatible to LM95245.

Also update link to LM95245 data sheet, and drop the link to the
datasheet from the driver source to simplify code maintenance.

Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2014-04-22 08:48:57 -07:00
parent f975b3399c
commit 162a8dfe73
3 changed files with 39 additions and 21 deletions
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14
Documentation/hwmon/lm95245
View file

@ -2,10 +2,14 @@ Kernel driver lm95245
==================
Supported chips:
* National Semiconductor LM95245
* TI LM95235
Addresses scanned: I2C 0x18, 0x29, 0x4c
Datasheet: Publicly available at the TI website
http://www.ti.com/lit/ds/symlink/lm95235.pdf
* TI / National Semiconductor LM95245
Addresses scanned: I2C 0x18, 0x19, 0x29, 0x4c, 0x4d
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/mpf/LM/LM95245.html
Datasheet: Publicly available at the TI website
http://www.ti.com/lit/ds/symlink/lm95245.pdf
Author: Alexander Stein <alexander.stein@systec-electronic.com>
@ -13,10 +17,10 @@ Author: Alexander Stein <alexander.stein@systec-electronic.com>
Description
-----------
The LM95245 is an 11-bit digital temperature sensor with a 2-wire System
LM95235 and LM95245 are 11-bit digital temperature sensors with a 2-wire System
Management Bus (SMBus) interface and TruTherm technology that can monitor
the temperature of a remote diode as well as its own temperature.
The LM95245 can be used to very accurately monitor the temperature of
The chips can be used to very accurately monitor the temperature of
external devices such as microprocessors.
All temperature values are given in millidegrees Celsius. Local temperature

5
drivers/hwmon/Kconfig
View file

@ -1048,10 +1048,11 @@ config SENSORS_LM95241
will be called lm95241.
config SENSORS_LM95245
tristate "National Semiconductor LM95245 sensor chip"
tristate "National Semiconductor LM95245 and compatibles"
depends on I2C
help
If you say yes here you get support for LM95245 sensor chip.
If you say yes here you get support for LM95235 and LM95245
temperature sensor chips.
This driver can also be built as a module. If so, the module
will be called lm95245.

41
drivers/hwmon/lm95245.c
View file

@ -1,10 +1,8 @@
/*
* Copyright (C) 2011 Alexander Stein <alexander.stein@systec-electronic.com>
*
* The LM95245 is a sensor chip made by National Semiconductors.
* The LM95245 is a sensor chip made by TI / National Semiconductor.
* It reports up to two temperatures (its own plus an external one).
* Complete datasheet can be obtained from National's website at:
* http://www.national.com/ds.cgi/LM/LM95245.pdf
*
* This driver is based on lm95241.c
*
@ -34,8 +32,6 @@
#include <linux/mutex.h>
#include <linux/sysfs.h>
#define DEVNAME "lm95245"
static const unsigned short normal_i2c[] = {
0x18, 0x19, 0x29, 0x4c, 0x4d, I2C_CLIENT_END };
@ -98,7 +94,8 @@ static const unsigned short normal_i2c[] = {
#define STATUS1_LOC 0x01
#define MANUFACTURER_ID 0x01
#define DEFAULT_REVISION 0xB3
#define LM95235_REVISION 0xB1
#define LM95245_REVISION 0xB3
static const u8 lm95245_reg_address[] = {
LM95245_REG_R_LOCAL_TEMPH_S,
@ -427,17 +424,32 @@ static int lm95245_detect(struct i2c_client *new_client,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = new_client->adapter;
int address = new_client->addr;
const char *name;
int rev, id;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
if (i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID)
!= MANUFACTURER_ID
|| i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID)
!= DEFAULT_REVISION)
id = i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID);
if (id != MANUFACTURER_ID)
return -ENODEV;
strlcpy(info->type, DEVNAME, I2C_NAME_SIZE);
rev = i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID);
switch (rev) {
case LM95235_REVISION:
if (address != 0x18 && address != 0x29 && address != 0x4c)
return -ENODEV;
name = "lm95235";
break;
case LM95245_REVISION:
name = "lm95245";
break;
default:
return -ENODEV;
}
strlcpy(info->type, name, I2C_NAME_SIZE);
return 0;
}
@ -484,7 +496,8 @@ static int lm95245_probe(struct i2c_client *client,
/* Driver data (common to all clients) */
static const struct i2c_device_id lm95245_id[] = {
{ DEVNAME, 0 },
{ "lm95235", 0 },
{ "lm95245", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm95245_id);
@ -492,7 +505,7 @@ MODULE_DEVICE_TABLE(i2c, lm95245_id);
static struct i2c_driver lm95245_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = DEVNAME,
.name = "lm95245",
},
.probe = lm95245_probe,
.id_table = lm95245_id,
@ -503,5 +516,5 @@ static struct i2c_driver lm95245_driver = {
module_i2c_driver(lm95245_driver);
MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
MODULE_DESCRIPTION("LM95245 sensor driver");
MODULE_DESCRIPTION("LM95235/LM95245 sensor driver");
MODULE_LICENSE("GPL");