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/*
* comedi_fc.h
* This is a place for code driver writers wish to share between
* two or more drivers. These functions are meant to be used only
* by drivers, they are NOT part of the kcomedilib API!
*
* Author: Frank Mori Hess <fmhess@users.sourceforge.net>
* Copyright (C) 2002 Frank Mori Hess
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef _COMEDI_FC_H
#define _COMEDI_FC_H
#include "../comedidev.h"
/**
* cfc_check_trigger_src() - trivially validate a comedi_cmd trigger source
* @src: pointer to the trigger source to validate
* @flags: bitmask of valid TRIG_* for the trigger
*
* This is used in "step 1" of the do_cmdtest functions of comedi drivers
* to vaildate the comedi_cmd triggers. The mask of the @src against the
* @flags allows the userspace comedilib to pass all the comedi_cmd
* triggers as TRIG_ANY and get back a bitmask of the valid trigger sources.
*/
static inline int cfc_check_trigger_src(unsigned int *src, unsigned int flags)
{
unsigned int orig_src = *src;
*src = orig_src & flags;
if (*src == TRIG_INVALID || *src != orig_src)
return -EINVAL;
return 0;
}
/**
* cfc_check_trigger_is_unique() - make sure a trigger source is unique
* @src: the trigger source to check
*/
static inline int cfc_check_trigger_is_unique(unsigned int src)
{
/* this test is true if more than one _src bit is set */
if ((src & (src - 1)) != 0)
return -EINVAL;
return 0;
}
/**
* cfc_check_trigger_arg_is() - trivially validate a trigger argument
* @arg: pointer to the trigger arg to validate
* @val: the value the argument should be
*/
static inline int cfc_check_trigger_arg_is(unsigned int *arg, unsigned int val)
{
if (*arg != val) {
*arg = val;
return -EINVAL;
}
return 0;
}
/**
* cfc_check_trigger_arg_min() - trivially validate a trigger argument
* @arg: pointer to the trigger arg to validate
* @val: the minimum value the argument should be
*/
static inline int cfc_check_trigger_arg_min(unsigned int *arg,
unsigned int val)
{
if (*arg < val) {
*arg = val;
return -EINVAL;
}
return 0;
}
/**
* cfc_check_trigger_arg_max() - trivially validate a trigger argument
* @arg: pointer to the trigger arg to validate
* @val: the maximum value the argument should be
*/
static inline int cfc_check_trigger_arg_max(unsigned int *arg,
unsigned int val)
{
if (*arg > val) {
*arg = val;
return -EINVAL;
}
return 0;
}
#endif /* _COMEDI_FC_H */
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