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![Wolfgang Denk](/assets/img/avatar_default.png)
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
286 lines
7.7 KiB
C
286 lines
7.7 KiB
C
/*
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* An inteface for configuring a hardware via u-boot environment.
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*
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* Copyright (c) 2009 MontaVista Software, Inc.
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* Copyright 2011 Freescale Semiconductor, Inc.
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*
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* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef HWCONFIG_TEST
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#include <config.h>
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#include <common.h>
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#include <exports.h>
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#include <hwconfig.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#else
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#define min(a, b) (((a) < (b)) ? (a) : (b))
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#endif /* HWCONFIG_TEST */
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DECLARE_GLOBAL_DATA_PTR;
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static const char *hwconfig_parse(const char *opts, size_t maxlen,
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const char *opt, char *stopchs, char eqch,
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size_t *arglen)
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{
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size_t optlen = strlen(opt);
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char *str;
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const char *start = opts;
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const char *end;
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next:
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str = strstr(opts, opt);
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end = str + optlen;
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if (end - start > maxlen)
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return NULL;
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if (str && (str == opts || strpbrk(str - 1, stopchs) == str - 1) &&
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(strpbrk(end, stopchs) == end || *end == eqch ||
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*end == '\0')) {
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const char *arg_end;
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if (!arglen)
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return str;
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if (*end != eqch)
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return NULL;
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arg_end = strpbrk(str, stopchs);
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if (!arg_end)
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*arglen = min(maxlen, strlen(str)) - optlen - 1;
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else
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*arglen = arg_end - end - 1;
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return end + 1;
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} else if (str) {
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opts = end;
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goto next;
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}
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return NULL;
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}
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const char cpu_hwconfig[] __attribute__((weak)) = "";
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const char board_hwconfig[] __attribute__((weak)) = "";
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static const char *__hwconfig(const char *opt, size_t *arglen,
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const char *env_hwconfig)
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{
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const char *ret;
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/* if we are passed a buffer use it, otherwise try the environment */
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if (!env_hwconfig) {
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if (!(gd->flags & GD_FLG_ENV_READY)) {
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printf("WARNING: Calling __hwconfig without a buffer "
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"and before environment is ready\n");
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return NULL;
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}
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env_hwconfig = getenv("hwconfig");
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}
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if (env_hwconfig) {
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ret = hwconfig_parse(env_hwconfig, strlen(env_hwconfig),
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opt, ";", ':', arglen);
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if (ret)
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return ret;
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}
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ret = hwconfig_parse(board_hwconfig, strlen(board_hwconfig),
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opt, ";", ':', arglen);
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if (ret)
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return ret;
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return hwconfig_parse(cpu_hwconfig, strlen(cpu_hwconfig),
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opt, ";", ':', arglen);
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}
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/*
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* hwconfig_f - query if a particular hwconfig option is specified
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* @opt: a string representing an option
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* @buf: if non-NULL use this buffer to parse, otherwise try env
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*
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* This call can be used to find out whether U-Boot should configure
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* a particular hardware option.
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*
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* Returns non-zero value if the hardware option can be used and thus
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* should be configured, 0 otherwise.
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*
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* This function also returns non-zero value if CONFIG_HWCONFIG is
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* undefined.
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*
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* Returning non-zero value without CONFIG_HWCONFIG has its crucial
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* purpose: the hwconfig() call should be a "transparent" interface,
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* e.g. if a board doesn't need hwconfig facility, then we assume
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* that the board file only calls things that are actually used, so
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* hwconfig() will always return true result.
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*/
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int hwconfig_f(const char *opt, char *buf)
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{
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return !!__hwconfig(opt, NULL, buf);
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}
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/*
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* hwconfig_arg_f - get hwconfig option's argument
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* @opt: a string representing an option
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* @arglen: a pointer to an allocated size_t variable
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* @buf: if non-NULL use this buffer to parse, otherwise try env
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*
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* Unlike hwconfig_f() function, this function returns a pointer to the
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* start of the hwconfig arguments, if option is not found or it has
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* no specified arguments, the function returns NULL pointer.
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*
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* If CONFIG_HWCONFIG is undefined, the function returns "", and
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* arglen is set to 0.
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*/
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const char *hwconfig_arg_f(const char *opt, size_t *arglen, char *buf)
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{
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return __hwconfig(opt, arglen, buf);
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}
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/*
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* hwconfig_arg_cmp_f - compare hwconfig option's argument
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* @opt: a string representing an option
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* @arg: a string for comparing an option's argument
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* @buf: if non-NULL use this buffer to parse, otherwise try env
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*
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* This call is similar to hwconfig_arg_f, but instead of returning
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* hwconfig argument and its length, it is comparing it to @arg.
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*
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* Returns non-zero value if @arg matches, 0 otherwise.
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*
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* If CONFIG_HWCONFIG is undefined, the function returns a non-zero
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* value, i.e. the argument matches.
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*/
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int hwconfig_arg_cmp_f(const char *opt, const char *arg, char *buf)
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{
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const char *argstr;
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size_t arglen;
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argstr = hwconfig_arg_f(opt, &arglen, buf);
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if (!argstr || arglen != strlen(arg))
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return 0;
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return !strncmp(argstr, arg, arglen);
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}
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/*
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* hwconfig_sub_f - query if a particular hwconfig sub-option is specified
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* @opt: a string representing an option
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* @subopt: a string representing a sub-option
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* @buf: if non-NULL use this buffer to parse, otherwise try env
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*
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* This call is similar to hwconfig_f(), except that it takes additional
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* argument @subopt. In this example:
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* "dr_usb:mode=peripheral"
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* "dr_usb" is an option, "mode" is a sub-option, and "peripheral" is its
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* argument.
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*/
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int hwconfig_sub_f(const char *opt, const char *subopt, char *buf)
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{
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size_t arglen;
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const char *arg;
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arg = __hwconfig(opt, &arglen, buf);
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if (!arg)
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return 0;
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return !!hwconfig_parse(arg, arglen, subopt, ",;", '=', NULL);
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}
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/*
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* hwconfig_subarg_f - get hwconfig sub-option's argument
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* @opt: a string representing an option
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* @subopt: a string representing a sub-option
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* @subarglen: a pointer to an allocated size_t variable
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* @buf: if non-NULL use this buffer to parse, otherwise try env
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*
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* This call is similar to hwconfig_arg_f(), except that it takes an
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* additional argument @subopt, and so works with sub-options.
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*/
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const char *hwconfig_subarg_f(const char *opt, const char *subopt,
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size_t *subarglen, char *buf)
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{
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size_t arglen;
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const char *arg;
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arg = __hwconfig(opt, &arglen, buf);
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if (!arg)
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return NULL;
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return hwconfig_parse(arg, arglen, subopt, ",;", '=', subarglen);
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}
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/*
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* hwconfig_arg_cmp_f - compare hwconfig sub-option's argument
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* @opt: a string representing an option
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* @subopt: a string representing a sub-option
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* @subarg: a string for comparing an sub-option's argument
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* @buf: if non-NULL use this buffer to parse, otherwise try env
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*
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* This call is similar to hwconfig_arg_cmp_f, except that it takes an
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* additional argument @subopt, and so works with sub-options.
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*/
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int hwconfig_subarg_cmp_f(const char *opt, const char *subopt,
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const char *subarg, char *buf)
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{
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const char *argstr;
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size_t arglen;
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argstr = hwconfig_subarg_f(opt, subopt, &arglen, buf);
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if (!argstr || arglen != strlen(subarg))
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return 0;
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return !strncmp(argstr, subarg, arglen);
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}
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#ifdef HWCONFIG_TEST
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int main()
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{
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const char *ret;
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size_t len;
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setenv("hwconfig", "key1:subkey1=value1,subkey2=value2;key2:value3;;;;"
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"key3;:,:=;key4", 1);
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ret = hwconfig_arg("key1", &len);
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printf("%zd %.*s\n", len, (int)len, ret);
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assert(len == 29);
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assert(hwconfig_arg_cmp("key1", "subkey1=value1,subkey2=value2"));
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assert(!strncmp(ret, "subkey1=value1,subkey2=value2", len));
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ret = hwconfig_subarg("key1", "subkey1", &len);
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printf("%zd %.*s\n", len, (int)len, ret);
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assert(len == 6);
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assert(hwconfig_subarg_cmp("key1", "subkey1", "value1"));
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assert(!strncmp(ret, "value1", len));
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ret = hwconfig_subarg("key1", "subkey2", &len);
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printf("%zd %.*s\n", len, (int)len, ret);
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assert(len == 6);
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assert(hwconfig_subarg_cmp("key1", "subkey2", "value2"));
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assert(!strncmp(ret, "value2", len));
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ret = hwconfig_arg("key2", &len);
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printf("%zd %.*s\n", len, (int)len, ret);
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assert(len == 6);
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assert(hwconfig_arg_cmp("key2", "value3"));
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assert(!strncmp(ret, "value3", len));
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assert(hwconfig("key3"));
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assert(hwconfig_arg("key4", &len) == NULL);
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assert(hwconfig_arg("bogus", &len) == NULL);
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unsetenv("hwconfig");
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assert(hwconfig(NULL) == 0);
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assert(hwconfig("") == 0);
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assert(hwconfig("key3") == 0);
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return 0;
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}
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#endif /* HWCONFIG_TEST */
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