]>
git.ipfire.org Git - people/ms/u-boot.git/blob - common/hwconfig.c
2 * An inteface for configuring a hardware via u-boot environment.
4 * Copyright (c) 2009 MontaVista Software, Inc.
6 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
18 #include <linux/types.h>
19 #include <linux/string.h>
21 static const char *hwconfig_parse(const char *opts
, size_t maxlen
,
22 const char *opt
, char stopch
, char eqch
,
25 size_t optlen
= strlen(opt
);
27 const char *start
= opts
;
31 str
= strstr(opts
, opt
);
33 if (end
- start
> maxlen
)
36 if (str
&& (str
== opts
|| str
[-1] == stopch
) &&
37 (*end
== stopch
|| *end
== eqch
|| *end
== '\0')) {
46 arg_end
= strchr(str
, stopch
);
48 *arglen
= min(maxlen
, strlen(str
)) - optlen
- 1;
50 *arglen
= arg_end
- end
- 1;
60 const char *cpu_hwconfig
__attribute__((weak
));
61 const char *board_hwconfig
__attribute__((weak
));
63 static const char *__hwconfig(const char *opt
, size_t *arglen
)
65 const char *env_hwconfig
= getenv("hwconfig");
68 return hwconfig_parse(env_hwconfig
, strlen(env_hwconfig
),
69 opt
, ';', ':', arglen
);
72 return hwconfig_parse(board_hwconfig
, strlen(board_hwconfig
),
73 opt
, ';', ':', arglen
);
76 return hwconfig_parse(cpu_hwconfig
, strlen(cpu_hwconfig
),
77 opt
, ';', ':', arglen
);
83 * hwconfig - query if a particular hwconfig option is specified
84 * @opt: a string representing an option
86 * This call can be used to find out whether U-Boot should configure
87 * a particular hardware option.
89 * Returns non-zero value if the hardware option can be used and thus
90 * should be configured, 0 otherwise.
92 * This function also returns non-zero value if CONFIG_HWCONFIG is
95 * Returning non-zero value without CONFIG_HWCONFIG has its crucial
96 * purpose: the hwconfig() call should be a "transparent" interface,
97 * e.g. if a board doesn't need hwconfig facility, then we assume
98 * that the board file only calls things that are actually used, so
99 * hwconfig() will always return true result.
101 int hwconfig(const char *opt
)
103 return !!__hwconfig(opt
, NULL
);
107 * hwconfig_arg - get hwconfig option's argument
108 * @opt: a string representing an option
109 * @arglen: a pointer to an allocated size_t variable
111 * Unlike hwconfig() function, this function returns a pointer to the
112 * start of the hwconfig arguments, if option is not found or it has
113 * no specified arguments, the function returns NULL pointer.
115 * If CONFIG_HWCONFIG is undefined, the function returns "", and
116 * arglen is set to 0.
118 const char *hwconfig_arg(const char *opt
, size_t *arglen
)
120 return __hwconfig(opt
, arglen
);
124 * hwconfig_arg_cmp - compare hwconfig option's argument
125 * @opt: a string representing an option
126 * @arg: a string for comparing an option's argument
128 * This call is similar to hwconfig_arg, but instead of returning
129 * hwconfig argument and its length, it is comparing it to @arg.
131 * Returns non-zero value if @arg matches, 0 otherwise.
133 * If CONFIG_HWCONFIG is undefined, the function returns a non-zero
134 * value, i.e. the argument matches.
136 int hwconfig_arg_cmp(const char *opt
, const char *arg
)
141 argstr
= hwconfig_arg(opt
, &arglen
);
142 if (!argstr
|| arglen
!= strlen(arg
))
145 return !strncmp(argstr
, arg
, arglen
);
149 * hwconfig_sub - query if a particular hwconfig sub-option is specified
150 * @opt: a string representing an option
151 * @subopt: a string representing a sub-option
153 * This call is similar to hwconfig(), except that it takes additional
154 * argument @subopt. In this example:
155 * "dr_usb:mode=peripheral"
156 * "dr_usb" is an option, "mode" is a sub-option, and "peripheral" is its
159 int hwconfig_sub(const char *opt
, const char *subopt
)
164 arg
= __hwconfig(opt
, &arglen
);
167 return !!hwconfig_parse(arg
, arglen
, subopt
, ',', '=', NULL
);
171 * hwconfig_subarg - get hwconfig sub-option's argument
172 * @opt: a string representing an option
173 * @subopt: a string representing a sub-option
174 * @subarglen: a pointer to an allocated size_t variable
176 * This call is similar to hwconfig_arg(), except that it takes an additional
177 * argument @subopt, and so works with sub-options.
179 const char *hwconfig_subarg(const char *opt
, const char *subopt
,
185 arg
= __hwconfig(opt
, &arglen
);
188 return hwconfig_parse(arg
, arglen
, subopt
, ',', '=', subarglen
);
192 * hwconfig_arg_cmp - compare hwconfig sub-option's argument
193 * @opt: a string representing an option
194 * @subopt: a string representing a sub-option
195 * @subarg: a string for comparing an sub-option's argument
197 * This call is similar to hwconfig_arg_cmp, except that it takes an additional
198 * argument @subopt, and so works with sub-options.
200 int hwconfig_subarg_cmp(const char *opt
, const char *subopt
, const char *subarg
)
205 argstr
= hwconfig_subarg(opt
, subopt
, &arglen
);
206 if (!argstr
|| arglen
!= strlen(subarg
))
209 return !strncmp(argstr
, subarg
, arglen
);