hwmon: (nct7904) Fix incorrect SMI status register setting of LTD temperature and fan.

According to datasheet, the SMI status register setting of LTD
temperature is SMI_STS3, and the SMI status register setting
of fan is SMI_STS5 and SMI_STS6.

Signed-off-by: amy.shih <amy.shih@advantech.com.tw>
Link: https://lore.kernel.org/r/20190912113300.4714-1-Amy.Shih@advantech.com.tw
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/hwmon/nct7904.c b/drivers/hwmon/nct7904.c
index ce688ab4fce2..95b447cfa24c 100644
--- a/drivers/hwmon/nct7904.c
+++ b/drivers/hwmon/nct7904.c
@@ -51,6 +51,7 @@
 #define VSEN1_HV_HL_REG         0x00    /* Bank 1; 2 regs (HV/LV) per sensor */
 #define VSEN1_LV_HL_REG         0x01    /* Bank 1; 2 regs (HV/LV) per sensor */
 #define SMI_STS1_REG            0xC1    /* Bank 0; SMI Status Register */
+#define SMI_STS3_REG            0xC3    /* Bank 0; SMI Status Register */
 #define SMI_STS5_REG            0xC5    /* Bank 0; SMI Status Register */
 #define SMI_STS7_REG            0xC7    /* Bank 0; SMI Status Register */
 #define SMI_STS8_REG            0xC8    /* Bank 0; SMI Status Register */
@@ -210,7 +211,7 @@ static int nct7904_read_fan(struct device *dev, u32 attr, int channel,
                 return 0;
         case hwmon_fan_alarm:
                 ret = nct7904_read_reg(data, BANK_0,
-                                       SMI_STS7_REG + (channel >> 3));
+                                       SMI_STS5_REG + (channel >> 3));
                 if (ret < 0)
                         return ret;
                 *val = (ret >> (channel & 0x07)) & 1;
@@ -351,7 +352,13 @@ static int nct7904_read_temp(struct device *dev, u32 attr, int channel,
                 *val = sign_extend32(temp, 10) * 125;
                 return 0;
         case hwmon_temp_alarm:
-                if (channel < 5) {
+                if (channel == 4) {
+                        ret = nct7904_read_reg(data, BANK_0,
+                                               SMI_STS3_REG);
+                        if (ret < 0)
+                                return ret;
+                        *val = (ret >> 1) & 1;
+                } else if (channel < 4) {
                         ret = nct7904_read_reg(data, BANK_0,
                                                SMI_STS1_REG);
                         if (ret < 0)