hwmon: (sch5627) Add sch5627_send_cmd function

This patch generalizes sch5627_read_virtual_reg so that it can
be used to write virtual regs too.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Sigend-off-by: Jean Delvare <khali@linux-fr.org>

diff --git a/drivers/hwmon/sch5627.c b/drivers/hwmon/sch5627.c
index 9a51dcc..d785a2c 100644 (file)
--- 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)