/*
* hwconfig_sub - query if a particular hwconfig sub-option is specified
* @opt: a string representing an option
* @subopt: a string representing a sub-option
*
* This call is similar to hwconfig(), except that it takes additional
* argument @subopt. In this example:
* "dr_usb:mode=peripheral"
* "dr_usb" is an option, "mode" is a sub-option, and "peripheral" is its
* argument.
*/
int hwconfig_sub(const char *opt, const char *subopt)
{
size_t arglen;
const char *arg;
arg = __hwconfig(opt, &arglen);
if (!arg)
return 0;
return !!hwconfig_parse(arg, arglen, subopt, ",;", '=', NULL);
}
/*
* hwconfig_subarg - get hwconfig sub-option's argument
* @opt: a string representing an option
* @subopt: a string representing a sub-option
* @subarglen: a pointer to an allocated size_t variable
*
* This call is similar to hwconfig_arg(), except that it takes an additional
* argument @subopt, and so works with sub-options.
*/
const char *hwconfig_subarg(const char *opt, const char *subopt,
size_t *subarglen)
{
size_t arglen;
const char *arg;
arg = __hwconfig(opt, &arglen);
if (!arg)
return NULL;
return hwconfig_parse(arg, arglen, subopt, ",;", '=', subarglen);
}
/*
* hwconfig_arg - get hwconfig option's argument
* @opt: a string representing an option
* @arglen: a pointer to an allocated size_t variable
*
* Unlike hwconfig() function, this function returns a pointer to the
* start of the hwconfig arguments, if option is not found or it has
* no specified arguments, the function returns NULL pointer.
*
* If CONFIG_HWCONFIG is undefined, the function returns "", and
* arglen is set to 0.
*/
const char *hwconfig_arg(const char *opt, size_t *arglen)
{
return __hwconfig(opt, arglen);
}
/*
* hwconfig - query if a particular hwconfig option is specified
* @opt: a string representing an option
*
* This call can be used to find out whether U-Boot should configure
* a particular hardware option.
*
* Returns non-zero value if the hardware option can be used and thus
* should be configured, 0 otherwise.
*
* This function also returns non-zero value if CONFIG_HWCONFIG is
* undefined.
*
* Returning non-zero value without CONFIG_HWCONFIG has its crucial
* purpose: the hwconfig() call should be a "transparent" interface,
* e.g. if a board doesn't need hwconfig facility, then we assume
* that the board file only calls things that are actually used, so
* hwconfig() will always return true result.
*/
int hwconfig(const char *opt)
{
return !!__hwconfig(opt, NULL);
}
/*
* hwconfig_arg_f - get hwconfig option's argument
* @opt: a string representing an option
* @arglen: a pointer to an allocated size_t variable
* @buf: if non-NULL use this buffer to parse, otherwise try env
*
* Unlike hwconfig_f() function, this function returns a pointer to the
* start of the hwconfig arguments, if option is not found or it has
* no specified arguments, the function returns NULL pointer.
*
* If CONFIG_HWCONFIG is undefined, the function returns "", and
* arglen is set to 0.
*/
const char *hwconfig_arg_f(const char *opt, size_t *arglen, char *buf)
{
return __hwconfig(opt, arglen, buf);
}
/*
* hwconfig_f - query if a particular hwconfig option is specified
* @opt: a string representing an option
* @buf: if non-NULL use this buffer to parse, otherwise try env
*
* This call can be used to find out whether U-Boot should configure
* a particular hardware option.
*
* Returns non-zero value if the hardware option can be used and thus
* should be configured, 0 otherwise.
*
* This function also returns non-zero value if CONFIG_HWCONFIG is
* undefined.
*
* Returning non-zero value without CONFIG_HWCONFIG has its crucial
* purpose: the hwconfig() call should be a "transparent" interface,
* e.g. if a board doesn't need hwconfig facility, then we assume
* that the board file only calls things that are actually used, so
* hwconfig() will always return true result.
*/
int hwconfig_f(const char *opt, char *buf)
{
return !!__hwconfig(opt, NULL, buf);
}
