1 files changed, 19 insertions, 4 deletions

diff --git a/drivers/hwmon/sch5627.c b/drivers/hwmon/sch5627.c
index 9a51dcca9b0d..d785a2c5431f 100644
--- a/drivers/hwmon/sch5627.c
+++ b/drivers/hwmon/sch5627.c
@@ -52,6 +52,9 @@
 #define SCH5627_COMPANY_ID              0x5c
 #define SCH5627_PRIMARY_ID              0xa0
 
+#define SCH5627_CMD_READ                0x02
+#define SCH5627_CMD_WRITE               0x03
+
 #define SCH5627_REG_BUILD_CODE          0x39
 #define SCH5627_REG_BUILD_ID            0x3a
 #define SCH5627_REG_HWMON_ID            0x3c
@@ -140,7 +143,7 @@ static inline void superio_exit(int base)
         release_region(base, 2);
 }
 
-static int sch5627_read_virtual_reg(struct sch5627_data *data, u16 reg)
+static int sch5627_send_cmd(struct sch5627_data *data, u8 cmd, u16 reg, u8 v)
 {
         u8 val;
         int i;
@@ -163,10 +166,14 @@ static int sch5627_read_virtual_reg(struct sch5627_data *data, u16 reg)
         outb(0x80, data->addr + 3);
 
         /* Write Request Packet Header */
-        outb(0x02, data->addr + 4); /* Access Type: VREG read */
+        outb(cmd, data->addr + 4); /* VREG Access Type read:0x02 write:0x03 */
         outb(0x01, data->addr + 5); /* # of Entries: 1 Byte (8-bit) */
         outb(0x04, data->addr + 2); /* Mailbox AP to first data entry loc. */
 
+        /* Write Value field */
+        if (cmd == SCH5627_CMD_WRITE)
+                outb(v, data->addr + 4);
+
         /* Write Address field */
         outb(reg & 0xff, data->addr + 6);
         outb(reg >> 8, data->addr + 7);
@@ -224,8 +231,16 @@ static int sch5627_read_virtual_reg(struct sch5627_data *data, u16 reg)
          * But if we do that things don't work, so let's not.
          */
 
-        /* Read Data from Mailbox */
-        return inb(data->addr + 4);
+        /* Read Value field */
+        if (cmd == SCH5627_CMD_READ)
+                return inb(data->addr + 4);
+
+        return 0;
+}
+
+static int sch5627_read_virtual_reg(struct sch5627_data *data, u16 reg)
+{
+        return sch5627_send_cmd(data, SCH5627_CMD_READ, reg, 0);
 }
 
 static int sch5627_read_virtual_reg16(struct sch5627_data *data, u16 reg)