//-------------------------------------------------------------------
//	msiset.c
//
//	This module creates a pseudo-file named '/proc/msiset' which
//	shows the current values of the Pro1000 network controller's
//	Message Signaled Interrupt Capability Register Set read from
//	documented offsets in that device's PCI Configuration Space.   
//
//	NOTE: Written and tested with Linux kernel version 2.6.22.5. 
//
//	programmer: ALLAN CRUSE
//	written on: 13 MAY 2008
//-------------------------------------------------------------------

#include <linux/module.h>	// for init_module() 
#include <linux/proc_fs.h>	// for create_proc_info_entry() 
#include <linux/pci.h>		// for pci_get_device()

#define VENDOR_ID	0x8086	// Intel Corporation
#define DEVICE_ID	0x109A	// 82573L controller

char modname[] = "msiset";
struct pci_dev	*devp;
char legend[] = "MSI Capability Register Set for Intel Pro1000 controller";

int my_get_info( char *buf, char **start, off_t off, int count )
{
	u16	msi_ctrl, msi_data;
	u32	msi_addr_lo, msi_addr_hi;
	int	len = 0;

	pci_read_config_word( devp, 0xD2, &msi_ctrl );
	pci_read_config_dword( devp, 0xD4, &msi_addr_lo );
	pci_read_config_dword( devp, 0xD8, &msi_addr_hi );
	pci_read_config_word( devp, 0xDC, &msi_data );

	len += sprintf( buf+len, "\n      %s\n\n", legend );
	len += sprintf( buf+len, "  msi_control=%04X ", msi_ctrl );
	len += sprintf( buf+len, "  msi_address=%08X%08X ", 
						msi_addr_hi, msi_addr_lo );
	len += sprintf( buf+len, "  msi_data=%04X ", msi_data );
	len += sprintf( buf+len, "\n\n" );

	return	len;
}


static int __init my_init( void )
{
	printk( "<1>\nInstalling \'%s\' module\n", modname );

	devp = pci_get_device( VENDOR_ID, DEVICE_ID, NULL );
	if ( !devp ) return -ENODEV;

	create_proc_info_entry( modname, 0, NULL, my_get_info );
	return	0;  //SUCCESS
}


static void __exit my_exit(void )
{
	remove_proc_entry( modname, NULL );

	printk( "<1>Removing \'%s\' module\n", modname );
}

module_init( my_init );
module_exit( my_exit );
MODULE_LICENSE("GPL");