hwmon: (lm70) Add support for LM71 and LM74

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>

2 files changed, 25 insertions, 6 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 6566ed6db3b0..8343cadd6632 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 1da62f616db5..789753d0df79 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");