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/*
* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <assert.h>
#include <ctype.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libfdt.h>
#include "util.h"
struct display_info {
int type; /* data type (s/i/u/x or 0 for default) */
int size; /* data size (1/2/4) */
int verbose; /* verbose output */
};
static void report_error(const char *where, int err)
{
fprintf(stderr, "Error at '%s': %s\n", where, fdt_strerror(err));
}
/**
* Encode a series of arguments in a property value.
*
* @param disp Display information / options
* @param arg List of arguments from command line
* @param arg_count Number of arguments (may be 0)
* @param valuep Returns buffer containing value
* @param *value_len Returns length of value encoded
*/
static int encode_value(struct display_info *disp, char **arg, int arg_count,
char **valuep, int *value_len)
{
char *value = NULL; /* holding area for value */
int value_size = 0; /* size of holding area */
char *ptr; /* pointer to current value position */
int len; /* length of this cell/string/byte */
int ival;
int upto; /* the number of bytes we have written to buf */
char fmt[3];
upto = 0;
if (disp->verbose)
fprintf(stderr, "Decoding value:\n");
fmt[0] = '%';
fmt[1] = disp->type ? disp->type : 'd';
fmt[2] = '\0';
for (; arg_count > 0; arg++, arg_count--, upto += len) {
/* assume integer unless told otherwise */
if (disp->type == 's')
len = strlen(*arg) + 1;
else
len = disp->size == -1 ? 4 : disp->size;
/* enlarge our value buffer by a suitable margin if needed */
if (upto + len > value_size) {
value_size = (upto + len) + 500;
value = realloc(value, value_size);
if (!value) {
fprintf(stderr, "Out of mmory: cannot alloc "
"%d bytes\n", value_size);
return -1;
}
}
ptr = value + upto;
if (disp->type == 's') {
memcpy(ptr, *arg, len);
if (disp->verbose)
fprintf(stderr, "\tstring: '%s'\n", ptr);
} else {
int *iptr = (int *)ptr;
sscanf(*arg, fmt, &ival);
if (len == 4)
*iptr = cpu_to_fdt32(ival);
else
*ptr = (uint8_t)ival;
if (disp->verbose) {
fprintf(stderr, "\t%s: %d\n",
disp->size == 1 ? "byte" :
disp->size == 2 ? "short" : "int",
ival);
}
}
}
*value_len = upto;
*valuep = value;
if (disp->verbose)
fprintf(stderr, "Value size %d\n", upto);
return 0;
}
static int store_key_value(void *blob, const char *node_name,
const char *property, const char *buf, int len)
{
int node;
int err;
node = fdt_path_offset(blob, node_name);
if (node < 0) {
report_error(node_name, node);
return -1;
}
err = fdt_setprop(blob, node, property, buf, len);
if (err) {
report_error(property, err);
return -1;
}
return 0;
}
static int do_fdtput(struct display_info *disp, const char *filename,
char **arg, int arg_count)
{
char *value;
char *blob;
int len, ret = 0;
blob = utilfdt_read(filename);
if (!blob)
return -1;
/* convert the arguments into a single binary value, then store */
assert(arg_count >= 2);
if (encode_value(disp, arg + 2, arg_count - 2, &value, &len) ||
store_key_value(blob, *arg, arg[1], value, len))
ret = -1;
if (!ret)
ret = utilfdt_write(filename, blob);
free(blob);
return ret;
}
static const char *usage_msg =
"fdtput - write a property value to a device tree\n"
"\n"
"The command line arguments are joined together into a single value.\n"
"\n"
"Usage:\n"
" fdtput <options> <dt file> <node> <property> [<value>...]\n"
"Options:\n"
"\t-t <type>\tType of data\n"
"\t-v\t\tVerbose: display each value decoded from command line\n"
"\t-h\t\tPrint this help\n\n"
USAGE_TYPE_MSG;
static void usage(const char *msg)
{
if (msg)
fprintf(stderr, "Error: %s\n\n", msg);
fprintf(stderr, "%s", usage_msg);
exit(2);
}
int main(int argc, char *argv[])
{
struct display_info disp;
char *filename = NULL;
memset(&disp, '\0', sizeof(disp));
disp.size = -1;
for (;;) {
int c = getopt(argc, argv, "ht:v");
if (c == -1)
break;
/*
* TODO: add options to:
* - delete property
* - delete node (optionally recursively)
* - rename node
* - pack fdt before writing
* - set amount of free space when writing
* - expand fdt if value doesn't fit
*/
switch (c) {
case 'h':
case '?':
usage(NULL);
case 't':
if (utilfdt_decode_type(optarg, &disp.type,
&disp.size))
usage("Invalid type string");
break;
case 'v':
disp.verbose = 1;
break;
}
}
if (optind < argc)
filename = argv[optind++];
if (!filename)
usage("Missing filename");
argv += optind;
argc -= optind;
if (argc < 1)
usage("Missing node");
if (argc < 2)
usage("Missing property");
if (do_fdtput(&disp, filename, argv, argc))
return 1;
return 0;
}
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