1 files changed, 18 insertions, 11 deletions

diff --git a/drivers/i2c/busses/i2c-sis5595.c b/drivers/i2c/busses/i2c-sis5595.c
index 9ca8f9155f95..dfc2d5eb6a68 100644
--- a/drivers/i2c/busses/i2c-sis5595.c
+++ b/drivers/i2c/busses/i2c-sis5595.c
@@ -1,6 +1,4 @@
 /*
-    sis5595.c - Part of lm_sensors, Linux kernel modules for hardware
-              monitoring
     Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl> and
     Philip Edelbrock <phil@netroedge.com>
 
@@ -62,6 +60,7 @@
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/i2c.h>
+#include <linux/acpi.h>
 #include <asm/io.h>
 
 static int blacklist[] = {
@@ -174,6 +173,11 @@ static int sis5595_setup(struct pci_dev *SIS5595_dev)
 
         /* NB: We grab just the two SMBus registers here, but this may still
          * interfere with ACPI :-(  */
+        retval = acpi_check_region(sis5595_base + SMB_INDEX, 2,
+                                   sis5595_driver.name);
+        if (retval)
+                return retval;
+
         if (!request_region(sis5595_base + SMB_INDEX, 2,
                             sis5595_driver.name)) {
                 dev_err(&SIS5595_dev->dev, "SMBus registers 0x%04x-0x%04x already in use!\n",
@@ -236,7 +240,7 @@ static int sis5595_transaction(struct i2c_adapter *adap)
                 sis5595_write(SMB_STS_HI, temp >> 8);
                 if ((temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8)) != 0x00) {
                         dev_dbg(&adap->dev, "Failed! (%02x)\n", temp);
-                        return -1;
+                        return -EBUSY;
                 } else {
                         dev_dbg(&adap->dev, "Successful!\n");
                 }
@@ -254,19 +258,19 @@ static int sis5595_transaction(struct i2c_adapter *adap)
         /* 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 & 0x10) {
                 dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
-                result = -1;
+                result = -ENXIO;
         }
 
         if (temp & 0x20) {
                 dev_err(&adap->dev, "Bus collision! SMBus may be locked until "
                         "next hard reset (or not...)\n");
                 /* Clock stops and slave is stuck in mid-transmission */
-                result = -1;
+                result = -EIO;
         }
 
         temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
@@ -282,11 +286,13 @@ static int sis5595_transaction(struct i2c_adapter *adap)
         return result;
 }
 
-/* Return -1 on error. */
+/* Return negative errno on error. */
 static s32 sis5595_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:
                 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
@@ -318,13 +324,14 @@ static s32 sis5595_access(struct i2c_adapter *adap, u16 addr,
                 break;
         default:
                 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
-                return -1;
+                return -EOPNOTSUPP;
         }
 
         sis5595_write(SMB_CTL_LO, ((size & 0x0E)));
 
-        if (sis5595_transaction(adap))
-                return -1;
+        status = sis5595_transaction(adap);
+        if (status)
+                return status;
 
         if ((size != SIS5595_PROC_CALL) &&
             ((read_write == I2C_SMBUS_WRITE) || (size == SIS5595_QUICK)))
@@ -359,7 +366,7 @@ static const struct i2c_algorithm smbus_algorithm = {
 static struct i2c_adapter sis5595_adapter = {
         .owner          = THIS_MODULE,
         .id             = I2C_HW_SMBUS_SIS5595,
-        .class          = I2C_CLASS_HWMON,
+        .class          = I2C_CLASS_HWMON | I2C_CLASS_SPD,
         .algo           = &smbus_algorithm,
 };