[PATCH] i2c-i801: Cleanups

i2c-i801: Cleanups

Various cleanups to the i2c-i801 driver:
* Fix documentation file and self file name references.
* i801_setup can be marked __devinit.
* Drop useless error local variable and label in i801_setup.
* Avoid a double PCI configuration register write in some cases.
* Use symbolic names for SMBHSTCFG bits.
* Transmit the error code returned by i801_setup instead of forcing it
  to an arbitrary value.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/i2c/busses/i2c-i801.c

@@ -1,5 +1,5 @@
 /*
-    i801.c - Part of lm_sensors, Linux kernel modules for hardware
+    i2c-i801.c - Part of lm_sensors, Linux kernel modules for hardware
               monitoring
     Copyright (c) 1998 - 2002  Frodo Looijaard <frodol@dds.nl>,
     Philip Edelbrock <phil@netroedge.com>, and Mark D. Studebaker
@@ -36,7 +36,7 @@
     This driver supports several versions of Intel's I/O Controller Hubs (ICH).
     For SMBus support, they are similar to the PIIX4 and are part
     of Intel's '810' and other chipsets.
-    See the doc/busses/i2c-i801 file for details.
+    See the file Documentation/i2c/busses/i2c-i801 for details.
     I2C Block Read and Process Call are not supported.
 */
 
@@ -102,9 +102,8 @@ static struct pci_driver i801_driver;
 static struct pci_dev *I801_dev;
 static int isich4;
 
-static int i801_setup(struct pci_dev *dev)
+static int __devinit i801_setup(struct pci_dev *dev)
 {
-	int error_return = 0;
 	unsigned char temp;
 
 	I801_dev = dev;
@@ -115,7 +114,7 @@ static int i801_setup(struct pci_dev *dev)
 	else
 		isich4 = 0;
 
-	/* Determine the address of the SMBus areas */
+	/* Determine the address of the SMBus area */
 	pci_read_config_word(I801_dev, SMBBA, &i801_smba);
 	i801_smba &= 0xfff0;
 	if (!i801_smba) {
@@ -127,20 +126,18 @@ static int i801_setup(struct pci_dev *dev)
 	if (!request_region(i801_smba, (isich4 ? 16 : 8), i801_driver.name)) {
 		dev_err(&dev->dev, "I801_smb region 0x%x already in use!\n",
 			i801_smba);
-		error_return = -EBUSY;
-		goto END;
+		return -EBUSY;
 	}
 
 	pci_read_config_byte(I801_dev, SMBHSTCFG, &temp);
 	temp &= ~SMBHSTCFG_I2C_EN;	/* SMBus timing */
-	pci_write_config_byte(I801_dev, SMBHSTCFG, temp);
-
-	if (!(temp & 1)) {
-		pci_write_config_byte(I801_dev, SMBHSTCFG, temp | 1);
+	if (!(temp & SMBHSTCFG_HST_EN)) {
 		dev_warn(&dev->dev, "enabling SMBus device\n");
+		temp |= SMBHSTCFG_HST_EN;
 	}
+	pci_write_config_byte(I801_dev, SMBHSTCFG, temp);
 
-	if (temp & 0x02)
+	if (temp & SMBHSTCFG_SMB_SMI_EN)
 		dev_dbg(&dev->dev, "I801 using Interrupt SMI# for SMBus.\n");
 	else
 		dev_dbg(&dev->dev, "I801 using PCI Interrupt for SMBus.\n");
@@ -149,8 +146,7 @@ static int i801_setup(struct pci_dev *dev)
 	dev_dbg(&dev->dev, "SMBREV = 0x%X\n", temp);
 	dev_dbg(&dev->dev, "I801_smba = 0x%X\n", i801_smba);
 
-END:
-	return error_return;
+	return 0;
 }
 
 static int i801_transaction(void)
@@ -516,12 +512,10 @@ MODULE_DEVICE_TABLE (pci, i801_ids);
 
 static int __devinit i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
 {
+	int err;
 
-	if (i801_setup(dev)) {
-		dev_warn(&dev->dev,
-			"I801 not detected, module not inserted.\n");
-		return -ENODEV;
-	}
+	if ((err = i801_setup(dev)))
+		return err;
 
 	/* set up the driverfs linkage to our parent device */
 	i801_adapter.dev.parent = &dev->dev;