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hwmon: (tmp421) Add support for TMP441 and TMP442 

TMP441 and TMP442 are compatible to TMP421 and TMP422.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
wifi-calibration
Guenter Roeck 2014-04-12 16:12:06 -07:00
parent a63ee9d83b
commit 05c77ab240
3 changed files with 33 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
Documentation/hwmon/tmp421
View File

@ -14,6 +14,14 @@ Supported chips:
Prefix: 'tmp423'
Addresses scanned: I2C 0x4c and 0x4d
Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp421.html
* Texas Instruments TMP441
Prefix: 'tmp441'
Addresses scanned: I2C 0x2a, 0x4c, 0x4d, 0x4e and 0x4f
Datasheet: http://www.ti.com/product/tmp441
* Texas Instruments TMP442
Prefix: 'tmp442'
Addresses scanned: I2C 0x4c and 0x4d
Datasheet: http://www.ti.com/product/tmp442
Authors:
Andre Prendel <andre.prendel@gmx.de>
@ -21,13 +29,13 @@ Authors:
Description
-----------
This driver implements support for Texas Instruments TMP421, TMP422
and TMP423 temperature sensor chips. These chips implement one local
and up to one (TMP421), up to two (TMP422) or up to three (TMP423)
remote sensors. Temperature is measured in degrees Celsius. The chips
are wired over I2C/SMBus and specified over a temperature range of -40
to +125 degrees Celsius. Resolution for both the local and remote
channels is 0.0625 degree C.
This driver implements support for Texas Instruments TMP421, TMP422,
TMP423, TMP441, and TMP442 temperature sensor chips. These chips
implement one local and up to one (TMP421, TMP441), up to two (TMP422,
TMP442) or up to three (TMP423) remote sensors. Temperature is measured
in degrees Celsius. The chips are wired over I2C/SMBus and specified
over a temperature range of -40 to +125 degrees Celsius. Resolution
for both the local and remote channels is 0.0625 degree C.
The chips support only temperature measurement. The driver exports
the temperature values via the following sysfs files:

2
drivers/hwmon/Kconfig
View File

@ -1431,7 +1431,7 @@ config SENSORS_TMP421
depends on I2C
help
If you say yes here you get support for Texas Instruments TMP421,
TMP422 and TMP423 temperature sensor chips.
TMP422, TMP423, TMP441, and TMP442 temperature sensor chips.
This driver can also be built as a module. If so, the module
will be called tmp421.

21
drivers/hwmon/tmp421.c
View File

@ -21,7 +21,7 @@
/*
* Driver for the Texas Instruments TMP421 SMBus temperature sensor IC.
* Supported models: TMP421, TMP422, TMP423
* Supported models: TMP421, TMP422, TMP423, TMP441, TMP442
*/
#include <linux/module.h>
@ -39,7 +39,7 @@
static const unsigned short normal_i2c[] = { 0x2a, 0x4c, 0x4d, 0x4e, 0x4f,
I2C_CLIENT_END };
enum chips { tmp421, tmp422, tmp423 };
enum chips { tmp421, tmp422, tmp423, tmp441, tmp442 };
/* The TMP421 registers */
#define TMP421_STATUS_REG 0x08
@ -60,11 +60,15 @@ static const u8 TMP421_TEMP_LSB[4] = { 0x10, 0x11, 0x12, 0x13 };
#define TMP421_DEVICE_ID 0x21
#define TMP422_DEVICE_ID 0x22
#define TMP423_DEVICE_ID 0x23
#define TMP441_DEVICE_ID 0x41
#define TMP442_DEVICE_ID 0x42
static const struct i2c_device_id tmp421_id[] = {
{ "tmp421", 2 },
{ "tmp422", 3 },
{ "tmp423", 4 },
{ "tmp441", 2 },
{ "tmp442", 3 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tmp421_id);
@ -235,7 +239,8 @@ static int tmp421_detect(struct i2c_client *client,
{
enum chips kind;
struct i2c_adapter *adapter = client->adapter;
const char *names[] = { "TMP421", "TMP422", "TMP423" };
const char * const names[] = { "TMP421", "TMP422", "TMP423",
"TMP441", "TMP442" };
int addr = client->addr;
u8 reg;
@ -269,6 +274,14 @@ static int tmp421_detect(struct i2c_client *client,
return -ENODEV;
kind = tmp423;
break;
case TMP441_DEVICE_ID:
kind = tmp441;
break;
case TMP442_DEVICE_ID:
if (addr != 0x4c && addr != 0x4d)
return -ENODEV;
kind = tmp442;
break;
default:
return -ENODEV;
}
@ -319,5 +332,5 @@ static struct i2c_driver tmp421_driver = {
module_i2c_driver(tmp421_driver);
MODULE_AUTHOR("Andre Prendel <andre.prendel@gmx.de>");
MODULE_DESCRIPTION("Texas Instruments TMP421/422/423 temperature sensor driver");
MODULE_DESCRIPTION("Texas Instruments TMP421/422/423/441/442 temperature sensor driver");
MODULE_LICENSE("GPL");