i2c-viapro: Add support for SMBus Process Call transactions

Add support for SMBus Process Call transactions. These are combined
word write, word read transactions.

Signed-off-by: Prakash Mortha <pmortha@escient.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/i2c/busses/i2c-viapro.c b/drivers/i2c/busses/i2c-viapro.c
index 1345da97b23b..73dc52e114eb 100644
--- a/drivers/i2c/busses/i2c-viapro.c
+++ b/drivers/i2c/busses/i2c-viapro.c
@@ -83,6 +83,7 @@ static unsigned short SMBHSTCFG = 0xD2;
 #define VT596_BYTE              0x04
 #define VT596_BYTE_DATA         0x08
 #define VT596_WORD_DATA         0x0C
+#define VT596_PROC_CALL         0x10
 #define VT596_BLOCK_DATA        0x14
 #define VT596_I2C_BLOCK_DATA    0x34
 
@@ -233,6 +234,12 @@ static s32 vt596_access(struct i2c_adapter *adap, u16 addr,
                 }
                 size = VT596_WORD_DATA;
                 break;
+        case I2C_SMBUS_PROC_CALL:
+                outb_p(command, SMBHSTCMD);
+                outb_p(data->word & 0xff, SMBHSTDAT0);
+                outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
+                size = VT596_PROC_CALL;
+                break;
         case I2C_SMBUS_I2C_BLOCK_DATA:
                 if (!(vt596_features & FEATURE_I2CBLOCK))
                         goto exit_unsupported;
@@ -263,6 +270,9 @@ static s32 vt596_access(struct i2c_adapter *adap, u16 addr,
         if (status)
                 return status;
 
+        if (size == VT596_PROC_CALL)
+                read_write = I2C_SMBUS_READ;
+
         if ((read_write == I2C_SMBUS_WRITE) || (size == VT596_QUICK))
                 return 0;
 
@@ -272,6 +282,7 @@ static s32 vt596_access(struct i2c_adapter *adap, u16 addr,
                 data->byte = inb_p(SMBHSTDAT0);
                 break;
         case VT596_WORD_DATA:
+        case VT596_PROC_CALL:
                 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
                 break;
         case VT596_I2C_BLOCK_DATA:
@@ -296,7 +307,7 @@ static u32 vt596_func(struct i2c_adapter *adapter)
 {
         u32 func = I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
             I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
-            I2C_FUNC_SMBUS_BLOCK_DATA;
+            I2C_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_BLOCK_DATA;
 
         if (vt596_features & FEATURE_I2CBLOCK)
                 func |= I2C_FUNC_SMBUS_I2C_BLOCK;