1 files changed, 33 insertions, 26 deletions

diff --git a/drivers/i2c/busses/i2c-sis630.c b/drivers/i2c/busses/i2c-sis630.c
index 3765dd7f450f..e7c4b790da54 100644
--- a/drivers/i2c/busses/i2c-sis630.c
+++ b/drivers/i2c/busses/i2c-sis630.c
@@ -1,7 +1,4 @@
 /*
-    i2c-sis630.c - Part of lm_sensors, Linux kernel modules for hardware
-              monitoring
-
     Copyright (c) 2002,2003 Alexander Malysh <amalysh@web.de>
 
     This program is free software; you can redistribute it and/or modify
@@ -55,6 +52,7 @@
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/i2c.h>
+#include <linux/acpi.h>
 #include <asm/io.h>
 
 /* SIS630 SMBus registers */
@@ -134,7 +132,7 @@ static int sis630_transaction_start(struct i2c_adapter *adap, int size, u8 *oldc
 
                 if ((temp = sis630_read(SMB_CNT) & 0x03) != 0x00) {
                         dev_dbg(&adap->dev, "Failed! (%02x)\n", temp);
-                        return -1;
+                        return -EBUSY;
                 } else {
                         dev_dbg(&adap->dev, "Successful!\n");
                 }
@@ -177,17 +175,17 @@ static int sis630_transaction_wait(struct i2c_adapter *adap, int size)
         /* If the SMBus is still busy, we give up */
         if (timeout >= MAX_TIMEOUT) {
                 dev_dbg(&adap->dev, "SMBus Timeout!\n");
-                result = -1;
+                result = -ETIMEDOUT;
         }
 
         if (temp & 0x02) {
                 dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
-                result = -1;
+                result = -ENXIO;
         }
 
         if (temp & 0x04) {
                 dev_err(&adap->dev, "Bus collision!\n");
-                result = -1;
+                result = -EIO;
                 /*
                   TBD: Datasheet say:
                   the software should clear this bit and restart SMBUS operation.
@@ -250,8 +248,10 @@ static int sis630_block_data(struct i2c_adapter *adap, union i2c_smbus_data *dat
                         if (i==8 || (len<8 && i==len)) {
                                 dev_dbg(&adap->dev, "start trans len=%d i=%d\n",len ,i);
                                 /* first transaction */
-                                if (sis630_transaction_start(adap, SIS630_BLOCK_DATA, &oldclock))
-                                        return -1;
+                                rc = sis630_transaction_start(adap,
+                                                SIS630_BLOCK_DATA, &oldclock);
+                                if (rc)
+                                        return rc;
                         }
                         else if ((i-1)%8 == 7 || i==len) {
                                 dev_dbg(&adap->dev, "trans_wait len=%d i=%d\n",len,i);
@@ -264,9 +264,10 @@ static int sis630_block_data(struct i2c_adapter *adap, union i2c_smbus_data *dat
                                         */
                                         sis630_write(SMB_STS,0x10);
                                 }
-                                if (sis630_transaction_wait(adap, SIS630_BLOCK_DATA)) {
+                                rc = sis630_transaction_wait(adap,
+                                                SIS630_BLOCK_DATA);
+                                if (rc) {
                                         dev_dbg(&adap->dev, "trans_wait failed\n");
-                                        rc = -1;
                                         break;
                                 }
                         }
@@ -275,13 +276,14 @@ static int sis630_block_data(struct i2c_adapter *adap, union i2c_smbus_data *dat
         else {
                 /* read request */
                 data->block[0] = len = 0;
-                if (sis630_transaction_start(adap, SIS630_BLOCK_DATA, &oldclock)) {
-                        return -1;
-                }
+                rc = sis630_transaction_start(adap,
+                                SIS630_BLOCK_DATA, &oldclock);
+                if (rc)
+                        return rc;
                 do {
-                        if (sis630_transaction_wait(adap, SIS630_BLOCK_DATA)) {
+                        rc = sis630_transaction_wait(adap, SIS630_BLOCK_DATA);
+                        if (rc) {
                                 dev_dbg(&adap->dev, "trans_wait failed\n");
-                                rc = -1;
                                 break;
                         }
                         /* if this first transaction then read byte count */
@@ -311,11 +313,13 @@ static int sis630_block_data(struct i2c_adapter *adap, union i2c_smbus_data *dat
         return rc;
 }
 
-/* Return -1 on error. */
+/* Return negative errno on error. */
 static s32 sis630_access(struct i2c_adapter *adap, u16 addr,
                          unsigned short flags, char read_write,
                          u8 command, int size, union i2c_smbus_data *data)
 {
+        int status;
+
         switch (size) {
                 case I2C_SMBUS_QUICK:
                         sis630_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
@@ -350,13 +354,14 @@ static s32 sis630_access(struct i2c_adapter *adap, u16 addr,
                         size = SIS630_BLOCK_DATA;
                         return sis630_block_data(adap, data, read_write);
                 default:
-                        printk("Unsupported I2C size\n");
-                        return -1;
-                        break;
+                        dev_warn(&adap->dev, "Unsupported transaction %d\n",
+                                 size);
+                        return -EOPNOTSUPP;
         }
 
-        if (sis630_transaction(adap, size))
-                return -1;
+        status = sis630_transaction(adap, size);
+        if (status)
+                return status;
 
         if ((size != SIS630_PCALL) &&
                 ((read_write == I2C_SMBUS_WRITE) || (size == SIS630_QUICK))) {
@@ -372,9 +377,6 @@ static s32 sis630_access(struct i2c_adapter *adap, u16 addr,
                 case SIS630_WORD_DATA:
                         data->word = sis630_read(SMB_BYTE) + (sis630_read(SMB_BYTE + 1) << 8);
                         break;
-                default:
-                        return -1;
-                        break;
         }
 
         return 0;
@@ -433,6 +435,11 @@ static int sis630_setup(struct pci_dev *sis630_dev)
 
         dev_dbg(&sis630_dev->dev, "ACPI base at 0x%04x\n", acpi_base);
 
+        retval = acpi_check_region(acpi_base + SMB_STS, SIS630_SMB_IOREGION,
+                                   sis630_driver.name);
+        if (retval)
+                goto exit;
+
         /* Everything is happy, let's grab the memory and set things up. */
         if (!request_region(acpi_base + SMB_STS, SIS630_SMB_IOREGION,
                             sis630_driver.name)) {
@@ -458,7 +465,7 @@ static const struct i2c_algorithm smbus_algorithm = {
 static struct i2c_adapter sis630_adapter = {
         .owner          = THIS_MODULE,
         .id             = I2C_HW_SMBUS_SIS630,
-        .class          = I2C_CLASS_HWMON,
+        .class          = I2C_CLASS_HWMON | I2C_CLASS_SPD,
         .algo           = &smbus_algorithm,
 };