static unsigned int SMC37c669_is_device_enabled()

in kernel/smc37c669.c [1053:1188]

• 55 lines of code
• 3 McCabe index (conditional complexity)

static unsigned int SMC37c669_is_device_enabled( 
    unsigned int func 
);

#if 0
static unsigned int SMC37c669_get_device_config( 
    unsigned int func, 
    int *port, 
    int *irq, 
    int *drq 
);
#endif

static void SMC37c669_config_mode( 
    unsigned int enable 
);

static unsigned char SMC37c669_read_config( 
    unsigned char index 
);

static void SMC37c669_write_config( 
    unsigned char index, 
    unsigned char data 
);

static void SMC37c669_init_local_config( void );

static struct DEVICE_CONFIG *SMC37c669_get_config(
    unsigned int func
);

static int SMC37c669_xlate_irq(
    int irq 
);

static int SMC37c669_xlate_drq(
    int drq 
);

static  __cacheline_aligned DEFINE_SPINLOCK(smc_lock);

/*
**++
**  FUNCTIONAL DESCRIPTION:
**
**      This function detects the presence of an SMC37c669 Super I/O
**	controller.
**
**  FORMAL PARAMETERS:
**
**	None
**
**  RETURN VALUE:
**
**      Returns a pointer to the device if found, otherwise,
**	the NULL pointer is returned.
**
**  SIDE EFFECTS:
**
**      None
**
**--
*/
SMC37c669_CONFIG_REGS * __init SMC37c669_detect( int index )
{
    int i;
    SMC37c669_DEVICE_ID_REGISTER id;

    for ( i = 0;  SMC37c669_Addresses[i] != 0;  i++ ) {
/*
** Initialize the device pointer even though we don't yet know if
** the controller is at this address.  The support functions access
** the controller through this device pointer so we need to set it
** even when we are looking ...
*/
    	SMC37c669 = ( SMC37c669_CONFIG_REGS * )SMC37c669_Addresses[i];
/*
** Enter configuration mode
*/
	SMC37c669_config_mode( TRUE );
/*
** Read the device id
*/
	id.as_uchar = SMC37c669_read_config( SMC37c669_DEVICE_ID_INDEX );
/*
** Exit configuration mode
*/
	SMC37c669_config_mode( FALSE );
/*
** Does the device id match?  If so, assume we have found an
** SMC37c669 controller at this address.
*/
	if ( id.by_field.device_id == SMC37c669_DEVICE_ID ) {
/*
** Initialize the IRQ and DRQ translation tables.
*/
    	    SMC37c669_irq_table = SMC37c669_irq_tables[ index ];
	    SMC37c669_drq_table = SMC37c669_default_drq_table;
/*
** erfix
**
** If the platform can't use the IRQ and DRQ defaults set up in this 
** file, it should call a platform-specific external routine at this 
** point to reset the IRQ and DRQ translation table pointers to point 
** at the appropriate tables for the platform.  If the defaults are 
** acceptable, then the external routine should do nothing.
*/

/*
** Put the chip back into configuration mode
*/
	    SMC37c669_config_mode( TRUE );
/*
** Initialize local storage for configuration information
*/
	    SMC37c669_init_local_config( );
/*
** Exit configuration mode
*/
	    SMC37c669_config_mode( FALSE );
/*
** SMC37c669 controller found, break out of search loop
*/
	    break;
	}
	else {
/*
** Otherwise, we did not find an SMC37c669 controller at this
** address so set the device pointer to NULL.
*/
	    SMC37c669 = NULL;
	}
    }
    return SMC37c669;
}