Adding support for LM74 and LM71 chips
Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
diff -u linux-3.5-vanilla/drivers/hwmon/Kconfig linux-3.5/drivers/hwmon/Kconfig
--- linux-3.5-vanilla/drivers/hwmon/Kconfig 2012-07-21 22:58:29.000000000
+0200
+++ linux-3.5/drivers/hwmon/Kconfig 2012-08-25 00:44:05.000000000 +0200
@@ -530,12 +530,12 @@
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 -u linux-3.5-vanilla/drivers/hwmon/lm70.c linux-3.5/drivers/hwmon/lm70.c
--- linux-3.5-vanilla/drivers/hwmon/lm70.c 2012-07-21 22:58:29.000000000
+0200
+++ linux-3.5/drivers/hwmon/lm70.c 2012-08-25 00:49:46.000000000 +0200
@@ -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 LM71 */
struct lm70 {
struct device *hwmon_dev;
@@ -88,9 +90,13 @@
* 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 @@
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 @@
case LM70_CHIP_TMP121:
ret = sprintf(buf, "tmp121\n");
break;
+ case LM71_CHIP_LM71:
+ ret = sprintf(buf, "lm71\n");
+ break;
+ case LM74_CHIP_LM74:
+ ret = sprintf(buf, "lm74\n");
+ break;
default:
ret = -EINVAL;
}
@@ -139,7 +156,7 @@
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;
@@ -198,6 +215,8 @@
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);
@@ -215,5 +234,5 @@
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");
diff -u linux-3.5-vanilla/Documentation/hwmon/lm70
linux-3.5/Documentation/hwmon/lm70
--- linux-3.5-vanilla/Documentation/hwmon/lm70 2012-07-21 22:58:29.000000000
+0200
+++ linux-3.5/Documentation/hwmon/lm70 2012-08-25 00:37:15.000000000 +0200
@@ -6,6 +6,10 @@
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 <kai...@designergraphix.com>
@@ -31,9 +35,12 @@
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
+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
---------
Jean Delvare <kh...@linux-fr.org> for mentoring the hwmon-side driver
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