PATCH for 2.6: Enabling disabled M7101 device (quirks.c)

["Enrico Bartky" <DOSProfi@web.de>]

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Hello,

I have ported the prog/hotplug/m7101.c module from lm_sensors for kernel 2.6. Here is the patch.

EnricoB
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--- quirks.c.old	2004-12-24 22:33:49.000000000 +0100
+++ quirks.c	2005-01-18 16:46:57.057499248 +0100
@@ -19,6 +19,8 @@
 #include <linux/init.h>
 #include <linux/delay.h>
 
+#include "pci.h"
+
 #undef DEBUG
 
 /* Deal with broken BIOS'es that neglect to enable passive release,
@@ -280,6 +282,74 @@
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AL,	PCI_DEVICE_ID_AL_M7101,		quirk_ali7101_acpi );
 
+/* ALi 1533 fixup to enable the M7101 SMBus Controller
+ *          ported from prog/hotplug of the lm_sensors
+ *          package
+ */
+static void __devinit quirk_ali1533_smbus(struct pci_dev *dev)
+{
+	u8 val = 0;
+	struct pci_dev *m7101;
+	
+	printk ( "M7101: Looking for disabled device... " );
+	
+	m7101 = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101, NULL);
+	
+	if ( m7101 )
+	{
+		printk ( "not found!\n" );
+		return;
+	}
+
+	pci_read_config_byte ( dev, 0x5F, &val );
+
+	if ( val & 0x4 )
+	{
+		printk ( "found.\n" );	
+		printk ( "M7101: Enabling M7101 device ... " );
+
+	    	pci_write_config_byte ( dev, 0x5F, val & 0xFB );
+		pci_read_config_byte ( dev, 0x5F, &val );
+
+		if ( val & 0x4 )
+		{
+			printk ( "failed.\n" );
+			return;
+		}
+		
+		printk ( "OK.\n" );
+	}
+	else
+		printk ( "not found.\n" );
+
+	m7101 = pci_scan_single_device ( dev->bus, 0x18 );
+
+	printk ( "M7101: Do we need to unlock registers? ... " );
+
+	if ( pci_read_config_byte ( m7101, 0x05B, &val ) )
+	{
+		printk ( "Failed to read.\n");
+		return;
+	}
+
+	if ( val & 0x06 )
+	{
+		printk ( "yes\n" );
+		printk ( "M7101: Unlocking registers ..." );
+		
+		val = val & ~0x06;
+
+		if ( pci_write_config_byte ( m7101, 0x05B, val ) )
+		{
+			printk ( "failed.\n" );
+			return;
+		}
+
+		printk ( "OK.\n" );
+	}
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AL,	PCI_DEVICE_ID_AL_M1533,		quirk_ali1533_smbus );
+
 /*
  * PIIX4 ACPI: Two IO regions pointed to by longwords at
  *	0x40 (64 bytes of ACPI registers)