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93f9dcf9 AV |
1 | /* |
2 | * An inteface for configuring a hardware via u-boot environment. | |
3 | * | |
4 | * Copyright (c) 2009 MontaVista Software, Inc. | |
5 | * | |
6 | * Author: Anton Vorontsov <avorontsov@ru.mvista.com> | |
7 | * | |
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. | |
12 | */ | |
13 | ||
3bf74a41 | 14 | #ifndef HWCONFIG_TEST |
93f9dcf9 AV |
15 | #include <config.h> |
16 | #include <common.h> | |
17 | #include <exports.h> | |
18 | #include <hwconfig.h> | |
19 | #include <linux/types.h> | |
20 | #include <linux/string.h> | |
3bf74a41 AV |
21 | #else |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | #include <assert.h> | |
26 | #define min(a, b) (((a) < (b)) ? (a) : (b)) | |
27 | #endif /* HWCONFIG_TEST */ | |
93f9dcf9 AV |
28 | |
29 | static const char *hwconfig_parse(const char *opts, size_t maxlen, | |
81f8d3b0 | 30 | const char *opt, char *stopchs, char eqch, |
93f9dcf9 AV |
31 | size_t *arglen) |
32 | { | |
33 | size_t optlen = strlen(opt); | |
34 | char *str; | |
35 | const char *start = opts; | |
36 | const char *end; | |
37 | ||
38 | next: | |
39 | str = strstr(opts, opt); | |
40 | end = str + optlen; | |
41 | if (end - start > maxlen) | |
42 | return NULL; | |
43 | ||
81f8d3b0 AV |
44 | if (str && (str == opts || strpbrk(str - 1, stopchs) == str - 1) && |
45 | (strpbrk(end, stopchs) == end || *end == eqch || | |
46 | *end == '\0')) { | |
93f9dcf9 AV |
47 | const char *arg_end; |
48 | ||
49 | if (!arglen) | |
50 | return str; | |
51 | ||
52 | if (*end != eqch) | |
53 | return NULL; | |
54 | ||
81f8d3b0 | 55 | arg_end = strpbrk(str, stopchs); |
93f9dcf9 AV |
56 | if (!arg_end) |
57 | *arglen = min(maxlen, strlen(str)) - optlen - 1; | |
58 | else | |
59 | *arglen = arg_end - end - 1; | |
60 | ||
61 | return end + 1; | |
62 | } else if (str) { | |
63 | opts = end; | |
64 | goto next; | |
65 | } | |
66 | return NULL; | |
67 | } | |
68 | ||
69 | const char *cpu_hwconfig __attribute__((weak)); | |
70 | const char *board_hwconfig __attribute__((weak)); | |
71 | ||
72 | static const char *__hwconfig(const char *opt, size_t *arglen) | |
73 | { | |
74 | const char *env_hwconfig = getenv("hwconfig"); | |
75 | ||
76 | if (env_hwconfig) | |
77 | return hwconfig_parse(env_hwconfig, strlen(env_hwconfig), | |
81f8d3b0 | 78 | opt, ";", ':', arglen); |
93f9dcf9 AV |
79 | |
80 | if (board_hwconfig) | |
81 | return hwconfig_parse(board_hwconfig, strlen(board_hwconfig), | |
81f8d3b0 | 82 | opt, ";", ':', arglen); |
93f9dcf9 AV |
83 | |
84 | if (cpu_hwconfig) | |
85 | return hwconfig_parse(cpu_hwconfig, strlen(cpu_hwconfig), | |
81f8d3b0 | 86 | opt, ";", ':', arglen); |
93f9dcf9 AV |
87 | |
88 | return NULL; | |
89 | } | |
90 | ||
91 | /* | |
92 | * hwconfig - query if a particular hwconfig option is specified | |
93 | * @opt: a string representing an option | |
94 | * | |
95 | * This call can be used to find out whether U-Boot should configure | |
96 | * a particular hardware option. | |
97 | * | |
98 | * Returns non-zero value if the hardware option can be used and thus | |
99 | * should be configured, 0 otherwise. | |
100 | * | |
101 | * This function also returns non-zero value if CONFIG_HWCONFIG is | |
102 | * undefined. | |
103 | * | |
104 | * Returning non-zero value without CONFIG_HWCONFIG has its crucial | |
105 | * purpose: the hwconfig() call should be a "transparent" interface, | |
106 | * e.g. if a board doesn't need hwconfig facility, then we assume | |
107 | * that the board file only calls things that are actually used, so | |
108 | * hwconfig() will always return true result. | |
109 | */ | |
110 | int hwconfig(const char *opt) | |
111 | { | |
112 | return !!__hwconfig(opt, NULL); | |
113 | } | |
114 | ||
115 | /* | |
116 | * hwconfig_arg - get hwconfig option's argument | |
117 | * @opt: a string representing an option | |
118 | * @arglen: a pointer to an allocated size_t variable | |
119 | * | |
120 | * Unlike hwconfig() function, this function returns a pointer to the | |
121 | * start of the hwconfig arguments, if option is not found or it has | |
122 | * no specified arguments, the function returns NULL pointer. | |
123 | * | |
124 | * If CONFIG_HWCONFIG is undefined, the function returns "", and | |
125 | * arglen is set to 0. | |
126 | */ | |
127 | const char *hwconfig_arg(const char *opt, size_t *arglen) | |
128 | { | |
129 | return __hwconfig(opt, arglen); | |
130 | } | |
131 | ||
132 | /* | |
133 | * hwconfig_arg_cmp - compare hwconfig option's argument | |
134 | * @opt: a string representing an option | |
135 | * @arg: a string for comparing an option's argument | |
136 | * | |
137 | * This call is similar to hwconfig_arg, but instead of returning | |
138 | * hwconfig argument and its length, it is comparing it to @arg. | |
139 | * | |
140 | * Returns non-zero value if @arg matches, 0 otherwise. | |
141 | * | |
142 | * If CONFIG_HWCONFIG is undefined, the function returns a non-zero | |
143 | * value, i.e. the argument matches. | |
144 | */ | |
145 | int hwconfig_arg_cmp(const char *opt, const char *arg) | |
146 | { | |
147 | const char *argstr; | |
148 | size_t arglen; | |
149 | ||
150 | argstr = hwconfig_arg(opt, &arglen); | |
151 | if (!argstr || arglen != strlen(arg)) | |
152 | return 0; | |
153 | ||
154 | return !strncmp(argstr, arg, arglen); | |
155 | } | |
156 | ||
157 | /* | |
158 | * hwconfig_sub - query if a particular hwconfig sub-option is specified | |
159 | * @opt: a string representing an option | |
160 | * @subopt: a string representing a sub-option | |
161 | * | |
162 | * This call is similar to hwconfig(), except that it takes additional | |
163 | * argument @subopt. In this example: | |
164 | * "dr_usb:mode=peripheral" | |
165 | * "dr_usb" is an option, "mode" is a sub-option, and "peripheral" is its | |
166 | * argument. | |
167 | */ | |
168 | int hwconfig_sub(const char *opt, const char *subopt) | |
169 | { | |
170 | size_t arglen; | |
171 | const char *arg; | |
172 | ||
173 | arg = __hwconfig(opt, &arglen); | |
174 | if (!arg) | |
175 | return 0; | |
81f8d3b0 | 176 | return !!hwconfig_parse(arg, arglen, subopt, ",;", '=', NULL); |
93f9dcf9 AV |
177 | } |
178 | ||
179 | /* | |
180 | * hwconfig_subarg - get hwconfig sub-option's argument | |
181 | * @opt: a string representing an option | |
182 | * @subopt: a string representing a sub-option | |
183 | * @subarglen: a pointer to an allocated size_t variable | |
184 | * | |
185 | * This call is similar to hwconfig_arg(), except that it takes an additional | |
186 | * argument @subopt, and so works with sub-options. | |
187 | */ | |
188 | const char *hwconfig_subarg(const char *opt, const char *subopt, | |
189 | size_t *subarglen) | |
190 | { | |
191 | size_t arglen; | |
192 | const char *arg; | |
193 | ||
194 | arg = __hwconfig(opt, &arglen); | |
195 | if (!arg) | |
196 | return NULL; | |
81f8d3b0 | 197 | return hwconfig_parse(arg, arglen, subopt, ",;", '=', subarglen); |
93f9dcf9 AV |
198 | } |
199 | ||
200 | /* | |
201 | * hwconfig_arg_cmp - compare hwconfig sub-option's argument | |
202 | * @opt: a string representing an option | |
203 | * @subopt: a string representing a sub-option | |
204 | * @subarg: a string for comparing an sub-option's argument | |
205 | * | |
206 | * This call is similar to hwconfig_arg_cmp, except that it takes an additional | |
207 | * argument @subopt, and so works with sub-options. | |
208 | */ | |
209 | int hwconfig_subarg_cmp(const char *opt, const char *subopt, const char *subarg) | |
210 | { | |
211 | const char *argstr; | |
212 | size_t arglen; | |
213 | ||
214 | argstr = hwconfig_subarg(opt, subopt, &arglen); | |
215 | if (!argstr || arglen != strlen(subarg)) | |
216 | return 0; | |
217 | ||
218 | return !strncmp(argstr, subarg, arglen); | |
219 | } | |
3bf74a41 AV |
220 | |
221 | #ifdef HWCONFIG_TEST | |
222 | int main() | |
223 | { | |
224 | const char *ret; | |
225 | size_t len; | |
226 | ||
227 | setenv("hwconfig", "key1:subkey1=value1,subkey2=value2;key2:value3;;;;" | |
228 | "key3;:,:=;key4", 1); | |
229 | ||
230 | ret = hwconfig_arg("key1", &len); | |
231 | printf("%zd %.*s\n", len, (int)len, ret); | |
232 | assert(len == 29); | |
233 | assert(hwconfig_arg_cmp("key1", "subkey1=value1,subkey2=value2")); | |
234 | assert(!strncmp(ret, "subkey1=value1,subkey2=value2", len)); | |
235 | ||
236 | ret = hwconfig_subarg("key1", "subkey1", &len); | |
237 | printf("%zd %.*s\n", len, (int)len, ret); | |
238 | assert(len == 6); | |
239 | assert(hwconfig_subarg_cmp("key1", "subkey1", "value1")); | |
240 | assert(!strncmp(ret, "value1", len)); | |
241 | ||
242 | ret = hwconfig_subarg("key1", "subkey2", &len); | |
243 | printf("%zd %.*s\n", len, (int)len, ret); | |
244 | assert(len == 6); | |
245 | assert(hwconfig_subarg_cmp("key1", "subkey2", "value2")); | |
246 | assert(!strncmp(ret, "value2", len)); | |
247 | ||
248 | ret = hwconfig_arg("key2", &len); | |
249 | printf("%zd %.*s\n", len, (int)len, ret); | |
250 | assert(len == 6); | |
251 | assert(hwconfig_arg_cmp("key2", "value3")); | |
252 | assert(!strncmp(ret, "value3", len)); | |
253 | ||
254 | assert(hwconfig("key3")); | |
255 | assert(hwconfig_arg("key4", &len) == NULL); | |
256 | assert(hwconfig_arg("bogus", &len) == NULL); | |
257 | ||
258 | unsetenv("hwconfig"); | |
259 | ||
260 | assert(hwconfig(NULL) == 0); | |
261 | assert(hwconfig("") == 0); | |
262 | assert(hwconfig("key3") == 0); | |
263 | ||
264 | return 0; | |
265 | } | |
266 | #endif /* HWCONFIG_TEST */ |