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284 lines
7.7 KiB
284 lines
7.7 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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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 <[email protected]> |
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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 = env_get("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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env_set("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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unenv_set("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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