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1 | /* |
2 | * Copyright (c) 2011 The Chromium OS Authors. All rights reserved. |
3 | * |
4 | * Portions from U-Boot cmd_fdt.c (C) Copyright 2007 |
5 | * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com |
6 | * Based on code written by: |
7 | * Pantelis Antoniou <pantelis.antoniou@gmail.com> and |
8 | * Matthew McClintock <msm@freescale.com> |
9 | * |
10 | * This program is free software; you can redistribute it and/or |
11 | * modify it under the terms of the GNU General Public License as |
12 | * published by the Free Software Foundation; either version 2 of |
13 | * the License, or (at your option) any later version. |
14 | * |
15 | * This program is distributed in the hope that it will be useful, |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
18 | * GNU General Public License for more details. |
19 | * |
20 | * You should have received a copy of the GNU General Public License |
21 | * along with this program; if not, write to the Free Software |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
23 | * MA 02111-1307 USA |
24 | */ |
25 | |
26 | #include <assert.h> |
27 | #include <ctype.h> |
28 | #include <getopt.h> |
29 | #include <stdio.h> |
30 | #include <stdlib.h> |
31 | #include <string.h> |
32 | |
33 | #include <libfdt.h> |
34 | |
35 | #include "util.h" |
36 | |
37 | enum display_mode { |
38 | MODE_SHOW_VALUE, /* show values for node properties */ |
39 | MODE_LIST_PROPS, /* list the properties for a node */ |
40 | MODE_LIST_SUBNODES, /* list the subnodes of a node */ |
41 | }; |
42 | |
43 | /* Holds information which controls our output and options */ |
44 | struct display_info { |
45 | int type; /* data type (s/i/u/x or 0 for default) */ |
46 | int size; /* data size (1/2/4) */ |
47 | enum display_mode mode; /* display mode that we are using */ |
48 | const char *default_val; /* default value if node/property not found */ |
49 | }; |
50 | |
51 | static void report_error(const char *where, int err) |
52 | { |
53 | fprintf(stderr, "Error at '%s': %s\n", where, fdt_strerror(err)); |
54 | } |
55 | |
56 | /** |
57 | * Displays data of a given length according to selected options |
58 | * |
59 | * If a specific data type is provided in disp, then this is used. Otherwise |
60 | * we try to guess the data type / size from the contents. |
61 | * |
62 | * @param disp Display information / options |
63 | * @param data Data to display |
64 | * @param len Maximum length of buffer |
65 | * @return 0 if ok, -1 if data does not match format |
66 | */ |
67 | static int show_data(struct display_info *disp, const char *data, int len) |
68 | { |
69 | int i, size; |
70 | const uint8_t *p = (const uint8_t *)data; |
71 | const char *s; |
72 | int value; |
73 | int is_string; |
74 | char fmt[3]; |
75 | |
76 | /* no data, don't print */ |
77 | if (len == 0) |
78 | return 0; |
79 | |
80 | is_string = (disp->type) == 's' || |
81 | (!disp->type && util_is_printable_string(data, len)); |
82 | if (is_string) { |
83 | if (data[len - 1] != '\0') { |
84 | fprintf(stderr, "Unterminated string\n"); |
85 | return -1; |
86 | } |
87 | for (s = data; s - data < len; s += strlen(s) + 1) { |
88 | if (s != data) |
89 | printf(" "); |
90 | printf("%s", (const char *)s); |
91 | } |
92 | return 0; |
93 | } |
94 | size = disp->size; |
95 | if (size == -1) { |
96 | size = (len % 4) == 0 ? 4 : 1; |
97 | } else if (len % size) { |
98 | fprintf(stderr, "Property length must be a multiple of " |
99 | "selected data size\n"); |
100 | return -1; |
101 | } |
102 | fmt[0] = '%'; |
103 | fmt[1] = disp->type ? disp->type : 'd'; |
104 | fmt[2] = '\0'; |
105 | for (i = 0; i < len; i += size, p += size) { |
106 | if (i) |
107 | printf(" "); |
108 | value = size == 4 ? fdt32_to_cpu(*(const uint32_t *)p) : |
109 | size == 2 ? (*p << 8) | p[1] : *p; |
110 | printf(fmt, value); |
111 | } |
112 | return 0; |
113 | } |
114 | |
115 | /** |
116 | * List all properties in a node, one per line. |
117 | * |
118 | * @param blob FDT blob |
119 | * @param node Node to display |
120 | * @return 0 if ok, or FDT_ERR... if not. |
121 | */ |
122 | static int list_properties(const void *blob, int node) |
123 | { |
124 | const struct fdt_property *data; |
125 | const char *name; |
126 | int prop; |
127 | |
128 | prop = fdt_first_property_offset(blob, node); |
129 | do { |
130 | /* Stop silently when there are no more properties */ |
131 | if (prop < 0) |
132 | return prop == -FDT_ERR_NOTFOUND ? 0 : prop; |
133 | data = fdt_get_property_by_offset(blob, prop, NULL); |
134 | name = fdt_string(blob, fdt32_to_cpu(data->nameoff)); |
135 | if (name) |
136 | puts(name); |
137 | prop = fdt_next_property_offset(blob, prop); |
138 | } while (1); |
139 | } |
140 | |
141 | #define MAX_LEVEL 32 /* how deeply nested we will go */ |
142 | |
143 | /** |
144 | * List all subnodes in a node, one per line |
145 | * |
146 | * @param blob FDT blob |
147 | * @param node Node to display |
148 | * @return 0 if ok, or FDT_ERR... if not. |
149 | */ |
150 | static int list_subnodes(const void *blob, int node) |
151 | { |
152 | int nextoffset; /* next node offset from libfdt */ |
153 | uint32_t tag; /* current tag */ |
154 | int level = 0; /* keep track of nesting level */ |
155 | const char *pathp; |
156 | int depth = 1; /* the assumed depth of this node */ |
157 | |
158 | while (level >= 0) { |
159 | tag = fdt_next_tag(blob, node, &nextoffset); |
160 | switch (tag) { |
161 | case FDT_BEGIN_NODE: |
162 | pathp = fdt_get_name(blob, node, NULL); |
163 | if (level <= depth) { |
164 | if (pathp == NULL) |
165 | pathp = "/* NULL pointer error */"; |
166 | if (*pathp == '\0') |
167 | pathp = "/"; /* root is nameless */ |
168 | if (level == 1) |
169 | puts(pathp); |
170 | } |
171 | level++; |
172 | if (level >= MAX_LEVEL) { |
173 | printf("Nested too deep, aborting.\n"); |
174 | return 1; |
175 | } |
176 | break; |
177 | case FDT_END_NODE: |
178 | level--; |
179 | if (level == 0) |
180 | level = -1; /* exit the loop */ |
181 | break; |
182 | case FDT_END: |
183 | return 1; |
184 | case FDT_PROP: |
185 | break; |
186 | default: |
187 | if (level <= depth) |
188 | printf("Unknown tag 0x%08X\n", tag); |
189 | return 1; |
190 | } |
191 | node = nextoffset; |
192 | } |
193 | return 0; |
194 | } |
195 | |
196 | /** |
197 | * Show the data for a given node (and perhaps property) according to the |
198 | * display option provided. |
199 | * |
200 | * @param blob FDT blob |
201 | * @param disp Display information / options |
202 | * @param node Node to display |
203 | * @param property Name of property to display, or NULL if none |
204 | * @return 0 if ok, -ve on error |
205 | */ |
206 | static int show_data_for_item(const void *blob, struct display_info *disp, |
207 | int node, const char *property) |
208 | { |
209 | const void *value = NULL; |
210 | int len, err = 0; |
211 | |
212 | switch (disp->mode) { |
213 | case MODE_LIST_PROPS: |
214 | err = list_properties(blob, node); |
215 | break; |
216 | |
217 | case MODE_LIST_SUBNODES: |
218 | err = list_subnodes(blob, node); |
219 | break; |
220 | |
221 | default: |
222 | assert(property); |
223 | value = fdt_getprop(blob, node, property, &len); |
224 | if (value) { |
225 | if (show_data(disp, value, len)) |
226 | err = -1; |
227 | else |
228 | printf("\n"); |
229 | } else if (disp->default_val) { |
230 | puts(disp->default_val); |
231 | } else { |
232 | report_error(property, len); |
233 | err = -1; |
234 | } |
235 | break; |
236 | } |
237 | |
238 | return err; |
239 | } |
240 | |
241 | /** |
242 | * Run the main fdtget operation, given a filename and valid arguments |
243 | * |
244 | * @param disp Display information / options |
245 | * @param filename Filename of blob file |
246 | * @param arg List of arguments to process |
247 | * @param arg_count Number of arguments |
248 | * @param return 0 if ok, -ve on error |
249 | */ |
250 | static int do_fdtget(struct display_info *disp, const char *filename, |
251 | char **arg, int arg_count, int args_per_step) |
252 | { |
253 | char *blob; |
254 | const char *prop; |
255 | int i, node; |
256 | |
257 | blob = utilfdt_read(filename); |
258 | if (!blob) |
259 | return -1; |
260 | |
261 | for (i = 0; i + args_per_step <= arg_count; i += args_per_step) { |
262 | node = fdt_path_offset(blob, arg[i]); |
263 | if (node < 0) { |
264 | if (disp->default_val) { |
265 | puts(disp->default_val); |
266 | continue; |
267 | } else { |
268 | report_error(arg[i], node); |
269 | return -1; |
270 | } |
271 | } |
272 | prop = args_per_step == 1 ? NULL : arg[i + 1]; |
273 | |
274 | if (show_data_for_item(blob, disp, node, prop)) |
275 | return -1; |
276 | } |
277 | return 0; |
278 | } |
279 | |
280 | static const char *usage_msg = |
281 | "fdtget - read values from device tree\n" |
282 | "\n" |
283 | "Each value is printed on a new line.\n\n" |
284 | "Usage:\n" |
285 | " fdtget <options> <dt file> [<node> <property>]...\n" |
286 | " fdtget -p <options> <dt file> [<node> ]...\n" |
287 | "Options:\n" |
288 | "\t-t <type>\tType of data\n" |
289 | "\t-p\t\tList properties for each node\n" |
290 | "\t-l\t\tList subnodes for each node\n" |
291 | "\t-d\t\tDefault value to display when the property is " |
292 | "missing\n" |
293 | "\t-h\t\tPrint this help\n\n" |
294 | USAGE_TYPE_MSG; |
295 | |
296 | static void usage(const char *msg) |
297 | { |
298 | if (msg) |
299 | fprintf(stderr, "Error: %s\n\n", msg); |
300 | |
301 | fprintf(stderr, "%s", usage_msg); |
302 | exit(2); |
303 | } |
304 | |
305 | int main(int argc, char *argv[]) |
306 | { |
307 | char *filename = NULL; |
308 | struct display_info disp; |
309 | int args_per_step = 2; |
310 | |
311 | /* set defaults */ |
312 | memset(&disp, '\0', sizeof(disp)); |
313 | disp.size = -1; |
314 | disp.mode = MODE_SHOW_VALUE; |
315 | for (;;) { |
316 | int c = getopt(argc, argv, "d:hlpt:"); |
317 | if (c == -1) |
318 | break; |
319 | |
320 | switch (c) { |
321 | case 'h': |
322 | case '?': |
323 | usage(NULL); |
324 | |
325 | case 't': |
326 | if (utilfdt_decode_type(optarg, &disp.type, |
327 | &disp.size)) |
328 | usage("Invalid type string"); |
329 | break; |
330 | |
331 | case 'p': |
332 | disp.mode = MODE_LIST_PROPS; |
333 | args_per_step = 1; |
334 | break; |
335 | |
336 | case 'l': |
337 | disp.mode = MODE_LIST_SUBNODES; |
338 | args_per_step = 1; |
339 | break; |
340 | |
341 | case 'd': |
342 | disp.default_val = optarg; |
343 | break; |
344 | } |
345 | } |
346 | |
347 | if (optind < argc) |
348 | filename = argv[optind++]; |
349 | if (!filename) |
350 | usage("Missing filename"); |
351 | |
352 | argv += optind; |
353 | argc -= optind; |
354 | |
355 | /* Allow no arguments, and silently succeed */ |
356 | if (!argc) |
357 | return 0; |
358 | |
359 | /* Check for node, property arguments */ |
360 | if (args_per_step == 2 && (argc % 2)) |
361 | usage("Must have an even number of arguments"); |
362 | |
363 | if (do_fdtget(&disp, filename, argv, argc, args_per_step)) |
364 | return 1; |
365 | return 0; |
366 | } |
367 |
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