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hwmon: (lm70) Add support for LM71 and LM74

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Add support for LM74 and LM71 to LM70 driver.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Christophe Leroy 2012-09-05 11:49:14 +02:00 committed by Guenter Roeck
parent 367eb2ee8a
commit a86e94dc94
3 changed files with 34 additions and 8 deletions
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11
Documentation/hwmon/lm70
View File

@ -6,6 +6,10 @@ Supported chips:
Datasheet: http://www.national.com/pf/LM/LM70.html
* Texas Instruments TMP121/TMP123
Information: http://focus.ti.com/docs/prod/folders/print/tmp121.html
* National Semiconductor LM71
Datasheet: http://www.ti.com/product/LM71
* National Semiconductor LM74
Datasheet: http://www.ti.com/product/LM74
Author:
Kaiwan N Billimoria <kaiwan@designergraphix.com>
@ -31,8 +35,11 @@ As a real (in-tree) example of this "SPI protocol driver" interfacing
with a "SPI master controller driver", see drivers/spi/spi_lm70llp.c
and its associated documentation.
The TMP121/TMP123 are very similar; main difference is 13-bit temperature
data (0.0625 degrees celsius resolution).
The LM74 and TMP121/TMP123 are very similar; main difference is 13-bit
temperature data (0.0625 degrees celsius resolution).
The LM71 is also very similar; main difference is 14-bit temperature
data (0.03125 degrees celsius resolution).
Thanks to
---------

6
drivers/hwmon/Kconfig
View File

@ -560,12 +560,12 @@ config SENSORS_LM63
will be called lm63.
config SENSORS_LM70
tristate "National Semiconductor LM70 / Texas Instruments TMP121"
tristate "National Semiconductor LM70 and compatibles"
depends on SPI_MASTER
help
If you say yes here you get support for the National Semiconductor
LM70 and Texas Instruments TMP121/TMP123 digital temperature
sensor chips.
LM70, LM71, LM74 and Texas Instruments TMP121/TMP123 digital tempera-
ture sensor chips.
This driver can also be built as a module. If so, the module
will be called lm70.

25
drivers/hwmon/lm70.c
View File

@ -43,6 +43,8 @@
#define LM70_CHIP_LM70 0 /* original NS LM70 */
#define LM70_CHIP_TMP121 1 /* TI TMP121/TMP123 */
#define LM70_CHIP_LM71 2 /* NS LM71 */
#define LM70_CHIP_LM74 3 /* NS LM74 */
struct lm70 {
struct device *hwmon_dev;
@ -88,9 +90,13 @@ static ssize_t lm70_sense_temp(struct device *dev,
* Celsius.
* So it's equivalent to multiplying by 0.25 * 1000 = 250.
*
* TMP121/TMP123:
* LM74 and TMP121/TMP123:
* 13 bits of 2's complement data, discard LSB 3 bits,
* resolution 0.0625 degrees celsius.
*
* LM71:
* 14 bits of 2's complement data, discard LSB 2 bits,
* resolution 0.0312 degrees celsius.
*/
switch (p_lm70->chip) {
case LM70_CHIP_LM70:
@ -98,8 +104,13 @@ static ssize_t lm70_sense_temp(struct device *dev,
break;
case LM70_CHIP_TMP121:
case LM70_CHIP_LM74:
val = ((int)raw / 8) * 625 / 10;
break;
case LM70_CHIP_LM71:
val = ((int)raw / 4) * 3125 / 100;
break;
}
status = sprintf(buf, "%d\n", val); /* millidegrees Celsius */
@ -123,6 +134,12 @@ static ssize_t lm70_show_name(struct device *dev, struct device_attribute
case LM70_CHIP_TMP121:
ret = sprintf(buf, "tmp121\n");
break;
case LM70_CHIP_LM71:
ret = sprintf(buf, "lm71\n");
break;
case LM70_CHIP_LM74:
ret = sprintf(buf, "lm74\n");
break;
default:
ret = -EINVAL;
}
@ -139,7 +156,7 @@ static int __devinit lm70_probe(struct spi_device *spi)
struct lm70 *p_lm70;
int status;
/* signaling is SPI_MODE_0 for both LM70 and TMP121 */
/* signaling is SPI_MODE_0 */
if (spi->mode & (SPI_CPOL | SPI_CPHA))
return -EINVAL;
@ -196,6 +213,8 @@ static int __devexit lm70_remove(struct spi_device *spi)
static const struct spi_device_id lm70_ids[] = {
{ "lm70", LM70_CHIP_LM70 },
{ "tmp121", LM70_CHIP_TMP121 },
{ "lm71", LM70_CHIP_LM71 },
{ "lm74", LM70_CHIP_LM74 },
{ },
};
MODULE_DEVICE_TABLE(spi, lm70_ids);
@ -213,5 +232,5 @@ static struct spi_driver lm70_driver = {
module_spi_driver(lm70_driver);
MODULE_AUTHOR("Kaiwan N Billimoria");
MODULE_DESCRIPTION("NS LM70 / TI TMP121/TMP123 Linux driver");
MODULE_DESCRIPTION("NS LM70 and compatibles Linux driver");
MODULE_LICENSE("GPL");