The SB800 chipset supports a multiplexed main SMBus controller with
four ports. Therefore the static variable piix4_main_adapter is
converted into a piix4_main_adapters array that can hold one
i2c_adapter for each multiplexed port.

The auxiliary adapter remains unchanged since it represents the second
(not multiplexed) SMBus controller on the SB800 chipset.

Signed-off-by: Christian Fetzer <fetzer...@gmail.com>
---
 drivers/i2c/busses/i2c-piix4.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index 97d2165..8934a32 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -75,6 +75,9 @@
 #define PIIX4_WORD_DATA                0x0C
 #define PIIX4_BLOCK_DATA       0x14
 
+/* Multi-port constants */
+#define PIIX4_MAX_ADAPTERS 4
+
 /* insmod parameters */
 
 /* If force is set to anything different from 0, we forcibly enable the
@@ -561,7 +564,7 @@ static const struct pci_device_id piix4_ids[] = {
 
 MODULE_DEVICE_TABLE (pci, piix4_ids);
 
-static struct i2c_adapter *piix4_main_adapter;
+static struct i2c_adapter *piix4_main_adapters[PIIX4_MAX_ADAPTERS];
 static struct i2c_adapter *piix4_aux_adapter;
 
 static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
@@ -629,7 +632,7 @@ static int piix4_probe(struct pci_dev *dev, const struct 
pci_device_id *id)
                return retval;
 
        /* Try to register main SMBus adapter, give up if we can't */
-       retval = piix4_add_adapter(dev, retval, &piix4_main_adapter);
+       retval = piix4_add_adapter(dev, retval, &piix4_main_adapters[0]);
        if (retval < 0)
                return retval;
 
@@ -675,9 +678,14 @@ static void piix4_adap_remove(struct i2c_adapter *adap, 
int free_smba)
 
 static void piix4_remove(struct pci_dev *dev)
 {
-       if (piix4_main_adapter) {
-               piix4_adap_remove(piix4_main_adapter, 1);
-               piix4_main_adapter = NULL;
+       int port;
+
+       for (port = 0; port < PIIX4_MAX_ADAPTERS; port++) {
+               if (piix4_main_adapters[port]) {
+                       piix4_adap_remove(piix4_main_adapters[port],
+                                         port == 0);
+                       piix4_main_adapters[port] = NULL;
+               }
        }
 
        if (piix4_aux_adapter) {
-- 
1.9.1

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