diff options
| -rw-r--r-- | Documentation/hwmon/lm70 | 11 | ||||
| -rw-r--r-- | drivers/hwmon/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/hwmon/lm70.c | 25 |
3 files changed, 34 insertions, 8 deletions
diff --git a/Documentation/hwmon/lm70 b/Documentation/hwmon/lm70 index 1bb1f20951c..86d182942c5 100644 --- a/Documentation/hwmon/lm70 +++ b/Documentation/hwmon/lm70 @@ -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 --------- diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 6566ed6db3b..8343cadd663 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -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. diff --git a/drivers/hwmon/lm70.c b/drivers/hwmon/lm70.c index 1da62f616db..789753d0df7 100644 --- a/drivers/hwmon/lm70.c +++ b/drivers/hwmon/lm70.c @@ -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"); |