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authorJean Delvare <khali@linux-fr.org>2006-06-12 15:52:02 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2006-06-22 14:10:35 -0400
commit455f332323a17446fb66ea7b2f65f2751f1a3f06 (patch)
treee5e8011731dd00b41bd1dbf035bc9595afa1f114 /drivers/i2c/busses
parent520e64d5c081c76b77b4ee87d241cd3e40edc43a (diff)
[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/busses')
-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 @@
1/* 1/*
2 i801.c - Part of lm_sensors, Linux kernel modules for hardware 2 i2c-i801.c - Part of lm_sensors, Linux kernel modules for hardware
3 monitoring 3 monitoring
4 Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl>, 4 Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl>,
5 Philip Edelbrock <phil@netroedge.com>, and Mark D. Studebaker 5 Philip Edelbrock <phil@netroedge.com>, and Mark D. Studebaker
@@ -36,7 +36,7 @@
36 This driver supports several versions of Intel's I/O Controller Hubs (ICH). 36 This driver supports several versions of Intel's I/O Controller Hubs (ICH).
37 For SMBus support, they are similar to the PIIX4 and are part 37 For SMBus support, they are similar to the PIIX4 and are part
38 of Intel's '810' and other chipsets. 38 of Intel's '810' and other chipsets.
39 See the doc/busses/i2c-i801 file for details. 39 See the file Documentation/i2c/busses/i2c-i801 for details.
40 I2C Block Read and Process Call are not supported. 40 I2C Block Read and Process Call are not supported.
41*/ 41*/
42 42
@@ -102,9 +102,8 @@ static struct pci_driver i801_driver;
102static struct pci_dev *I801_dev; 102static struct pci_dev *I801_dev;
103static int isich4; 103static int isich4;
104 104
105static int i801_setup(struct pci_dev *dev) 105static int __devinit i801_setup(struct pci_dev *dev)
106{ 106{
107 int error_return = 0;
108 unsigned char temp; 107 unsigned char temp;
109 108
110 I801_dev = dev; 109 I801_dev = dev;
@@ -115,7 +114,7 @@ static int i801_setup(struct pci_dev *dev)
115 else 114 else
116 isich4 = 0; 115 isich4 = 0;
117 116
118 /* Determine the address of the SMBus areas */ 117 /* Determine the address of the SMBus area */
119 pci_read_config_word(I801_dev, SMBBA, &i801_smba); 118 pci_read_config_word(I801_dev, SMBBA, &i801_smba);
120 i801_smba &= 0xfff0; 119 i801_smba &= 0xfff0;
121 if (!i801_smba) { 120 if (!i801_smba) {
@@ -127,20 +126,18 @@ static int i801_setup(struct pci_dev *dev)
127 if (!request_region(i801_smba, (isich4 ? 16 : 8), i801_driver.name)) { 126 if (!request_region(i801_smba, (isich4 ? 16 : 8), i801_driver.name)) {
128 dev_err(&dev->dev, "I801_smb region 0x%x already in use!\n", 127 dev_err(&dev->dev, "I801_smb region 0x%x already in use!\n",
129 i801_smba); 128 i801_smba);
130 error_return = -EBUSY; 129 return -EBUSY;
131 goto END;
132 } 130 }
133 131
134 pci_read_config_byte(I801_dev, SMBHSTCFG, &temp); 132 pci_read_config_byte(I801_dev, SMBHSTCFG, &temp);
135 temp &= ~SMBHSTCFG_I2C_EN; /* SMBus timing */ 133 temp &= ~SMBHSTCFG_I2C_EN; /* SMBus timing */
136 pci_write_config_byte(I801_dev, SMBHSTCFG, temp); 134 if (!(temp & SMBHSTCFG_HST_EN)) {
137
138 if (!(temp & 1)) {
139 pci_write_config_byte(I801_dev, SMBHSTCFG, temp | 1);
140 dev_warn(&dev->dev, "enabling SMBus device\n"); 135 dev_warn(&dev->dev, "enabling SMBus device\n");
136 temp |= SMBHSTCFG_HST_EN;
141 } 137 }
138 pci_write_config_byte(I801_dev, SMBHSTCFG, temp);
142 139
143 if (temp & 0x02) 140 if (temp & SMBHSTCFG_SMB_SMI_EN)
144 dev_dbg(&dev->dev, "I801 using Interrupt SMI# for SMBus.\n"); 141 dev_dbg(&dev->dev, "I801 using Interrupt SMI# for SMBus.\n");
145 else 142 else
146 dev_dbg(&dev->dev, "I801 using PCI Interrupt for SMBus.\n"); 143 dev_dbg(&dev->dev, "I801 using PCI Interrupt for SMBus.\n");
@@ -149,8 +146,7 @@ static int i801_setup(struct pci_dev *dev)
149 dev_dbg(&dev->dev, "SMBREV = 0x%X\n", temp); 146 dev_dbg(&dev->dev, "SMBREV = 0x%X\n", temp);
150 dev_dbg(&dev->dev, "I801_smba = 0x%X\n", i801_smba); 147 dev_dbg(&dev->dev, "I801_smba = 0x%X\n", i801_smba);
151 148
152END: 149 return 0;
153 return error_return;
154} 150}
155 151
156static int i801_transaction(void) 152static int i801_transaction(void)
@@ -516,12 +512,10 @@ MODULE_DEVICE_TABLE (pci, i801_ids);
516 512
517static int __devinit i801_probe(struct pci_dev *dev, const struct pci_device_id *id) 513static int __devinit i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
518{ 514{
515 int err;
519 516
520 if (i801_setup(dev)) { 517 if ((err = i801_setup(dev)))
521 dev_warn(&dev->dev, 518 return err;
522 "I801 not detected, module not inserted.\n");
523 return -ENODEV;
524 }
525 519
526 /* set up the driverfs linkage to our parent device */ 520 /* set up the driverfs linkage to our parent device */
527 i801_adapter.dev.parent = &dev->dev; 521 i801_adapter.dev.parent = &dev->dev;