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authorJean Delvare <khali@linux-fr.org>2006-06-12 21:52:02 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2006-06-22 11:10:35 -0700
commit455f332323a17446fb66ea7b2f65f2751f1a3f06 (patch)
treee5e8011731dd00b41bd1dbf035bc9595afa1f114 /drivers/i2c
parent520e64d5c081c76b77b4ee87d241cd3e40edc43a (diff)
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[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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-i801.c32
1 files changed, 13 insertions, 19 deletions
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index b651493375ca..b9e6fac8142d 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/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;