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author | Jean Delvare <khali@linux-fr.org> | 2006-06-12 21:52:02 +0200 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-06-22 11:10:35 -0700 |
commit | 455f332323a17446fb66ea7b2f65f2751f1a3f06 (patch) | |
tree | e5e8011731dd00b41bd1dbf035bc9595afa1f114 | |
parent | 520e64d5c081c76b77b4ee87d241cd3e40edc43a (diff) | |
download | kernel_samsung_smdk4412-455f332323a17446fb66ea7b2f65f2751f1a3f06.zip kernel_samsung_smdk4412-455f332323a17446fb66ea7b2f65f2751f1a3f06.tar.gz kernel_samsung_smdk4412-455f332323a17446fb66ea7b2f65f2751f1a3f06.tar.bz2 |
[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>
-rw-r--r-- | drivers/i2c/busses/i2c-i801.c | 32 |
1 files changed, 13 insertions, 19 deletions
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c index b651493..b9e6fac 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; |