[PATCH] p4b_smbus quirk update

[Dominik Brodowski]

Hi,

The p4b_smbus.c module located in lm_sensors-2.7.0/prog/hotplug does not
work for 2.5. kernels. Also, the code can be simplified much if enabling the
SMBus device is done as a "pci quirk" in drivers/pci/quirks.c in the linux
kernel sources. A patch for linux-kernel 2.5.59 is attached below. However, 
it _might_ be wise to add a check so that only Asus mainboards are affected.

	Dominik

diff -ruN linux-original/drivers/pci/quirks.c linux/drivers/pci/quirks.c
--- linux-original/drivers/pci/quirks.c	2003-02-01 17:33:43.000000000 +0100
+++ linux/drivers/pci/quirks.c	2003-02-02 11:50:12.000000000 +0100
@@ -535,6 +535,21 @@
 	}
 }
 
+static void __devinit quirk_p4b_smbus(struct pci_dev *dev)
+{
+	u16 val;
+	pci_read_config_word(dev, 0xF2, &val);
+	if (val & 0x8) {
+		pci_write_config_word(dev, 0xF2, val & (~0x8));
+		pci_read_config_word(dev, 0xF2, &val);
+		if(val & 0x8) 
+			printk(KERN_INFO "PCI: Fixup to enable i801 SMBus device failed - 0x%x", val);
+		else
+			printk(KERN_INFO "PCI: Fixup to enable i801 SMBus successful! - 0x%x\n", val);
+	}
+	return;
+}
+
 /*
  *  The main table of quirks.
  */
@@ -604,6 +619,12 @@
 
 	{ PCI_FIXUP_FINAL,	PCI_VENDOR_ID_CYRIX,	PCI_DEVICE_ID_CYRIX_PCI_MASTER, quirk_mediagx_master },
 	
+	/*
+	 * on Asus P4B boards, the i801SMBus device is disabled.
+	 */
+	{ PCI_FIXUP_HEADER,	PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_82801BA_0,	quirk_p4b_smbus },
+	{ PCI_FIXUP_HEADER,	PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_82801DB_0,	quirk_p4b_smbus },
+
 
 	{ 0 }
 };