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/*
* An inteface for configuring a hardware via u-boot environment.
*
* Copyright (c) 2009 MontaVista Software, Inc.
*
* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
*
* 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.
*/
#include <config.h>
#include <common.h>
#include <exports.h>
#include <hwconfig.h>
#include <linux/types.h>
#include <linux/string.h>
static const char *hwconfig_parse(const char *opts, size_t maxlen,
const char *opt, char stopch, char eqch,
size_t *arglen)
{
size_t optlen = strlen(opt);
char *str;
const char *start = opts;
const char *end;
next:
str = strstr(opts, opt);
end = str + optlen;
if (end - start > maxlen)
return NULL;
if (str && (str == opts || str[-1] == stopch) &&
(*end == stopch || *end == eqch || *end == '\0')) {
const char *arg_end;
if (!arglen)
return str;
if (*end != eqch)
return NULL;
arg_end = strchr(str, stopch);
if (!arg_end)
*arglen = min(maxlen, strlen(str)) - optlen - 1;
else
*arglen = arg_end - end - 1;
return end + 1;
} else if (str) {
opts = end;
goto next;
}
return NULL;
}
const char *cpu_hwconfig __attribute__((weak));
const char *board_hwconfig __attribute__((weak));
static const char *__hwconfig(const char *opt, size_t *arglen)
{
const char *env_hwconfig = getenv("hwconfig");
if (env_hwconfig)
return hwconfig_parse(env_hwconfig, strlen(env_hwconfig),
opt, ';', ':', arglen);
if (board_hwconfig)
return hwconfig_parse(board_hwconfig, strlen(board_hwconfig),
opt, ';', ':', arglen);
if (cpu_hwconfig)
return hwconfig_parse(cpu_hwconfig, strlen(cpu_hwconfig),
opt, ';', ':', arglen);
return NULL;
}
/*
* 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 - 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_arg_cmp - compare hwconfig option's argument
* @opt: a string representing an option
* @arg: a string for comparing an option's argument
*
* This call is similar to hwconfig_arg, but instead of returning
* hwconfig argument and its length, it is comparing it to @arg.
*
* Returns non-zero value if @arg matches, 0 otherwise.
*
* If CONFIG_HWCONFIG is undefined, the function returns a non-zero
* value, i.e. the argument matches.
*/
int hwconfig_arg_cmp(const char *opt, const char *arg)
{
const char *argstr;
size_t arglen;
argstr = hwconfig_arg(opt, &arglen);
if (!argstr || arglen != strlen(arg))
return 0;
return !strncmp(argstr, arg, arglen);
}
/*
* 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_cmp - compare hwconfig sub-option's argument
* @opt: a string representing an option
* @subopt: a string representing a sub-option
* @subarg: a string for comparing an sub-option's argument
*
* This call is similar to hwconfig_arg_cmp, except that it takes an additional
* argument @subopt, and so works with sub-options.
*/
int hwconfig_subarg_cmp(const char *opt, const char *subopt, const char *subarg)
{
const char *argstr;
size_t arglen;
argstr = hwconfig_subarg(opt, subopt, &arglen);
if (!argstr || arglen != strlen(subarg))
return 0;
return !strncmp(argstr, subarg, arglen);
}
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