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[PATCH] i2c-i801: Cleanups

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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>
This commit is contained in:
Jean Delvare 2006-06-12 21:52:02 +02:00 committed by Greg Kroah-Hartman
parent 520e64d5c0
commit 455f332323
1 changed files with 14 additions and 20 deletions
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34
drivers/i2c/busses/i2c-i801.c
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@ -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 */
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 & 1)) {
pci_write_config_byte(I801_dev, SMBHSTCFG, temp | 1);
dev_warn(&dev->dev, "enabling SMBus device\n");
}
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;