linux/scripts/dtc/fdtput.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

349 lines
7.7 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
*/
#include <assert.h>
#include <ctype.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libfdt.h>
#include "util.h"
/* These are the operations we support */
enum oper_type {
OPER_WRITE_PROP, /* Write a property in a node */
OPER_CREATE_NODE, /* Create a new node */
};
struct display_info {
enum oper_type oper; /* operation to perform */
int type; /* data type (s/i/u/x or 0 for default) */
int size; /* data size (1/2/4) */
int verbose; /* verbose output */
int auto_path; /* automatically create all path components */
};
/**
* Report an error with a particular node.
*
* @param name Node name to report error on
* @param namelen Length of node name, or -1 to use entire string
* @param err Error number to report (-FDT_ERR_...)
*/
static void report_error(const char *name, int namelen, int err)
{
if (namelen == -1)
namelen = strlen(name);
fprintf(stderr, "Error at '%1.*s': %s\n", namelen, name,
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, -1, node);
return -1;
}
err = fdt_setprop(blob, node, property, buf, len);
if (err) {
report_error(property, -1, err);
return -1;
}
return 0;
}
/**
* Create paths as needed for all components of a path
*
* Any components of the path that do not exist are created. Errors are
* reported.
*
* @param blob FDT blob to write into
* @param in_path Path to process
* @return 0 if ok, -1 on error
*/
static int create_paths(void *blob, const char *in_path)
{
const char *path = in_path;
const char *sep;
int node, offset = 0;
/* skip leading '/' */
while (*path == '/')
path++;
for (sep = path; *sep; path = sep + 1, offset = node) {
/* equivalent to strchrnul(), but it requires _GNU_SOURCE */
sep = strchr(path, '/');
if (!sep)
sep = path + strlen(path);
node = fdt_subnode_offset_namelen(blob, offset, path,
sep - path);
if (node == -FDT_ERR_NOTFOUND) {
node = fdt_add_subnode_namelen(blob, offset, path,
sep - path);
}
if (node < 0) {
report_error(path, sep - path, node);
return -1;
}
}
return 0;
}
/**
* Create a new node in the fdt.
*
* This will overwrite the node_name string. Any error is reported.
*
* TODO: Perhaps create fdt_path_offset_namelen() so we don't need to do this.
*
* @param blob FDT blob to write into
* @param node_name Name of node to create
* @return new node offset if found, or -1 on failure
*/
static int create_node(void *blob, const char *node_name)
{
int node = 0;
char *p;
p = strrchr(node_name, '/');
if (!p) {
report_error(node_name, -1, -FDT_ERR_BADPATH);
return -1;
}
*p = '\0';
if (p > node_name) {
node = fdt_path_offset(blob, node_name);
if (node < 0) {
report_error(node_name, -1, node);
return -1;
}
}
node = fdt_add_subnode(blob, node, p + 1);
if (node < 0) {
report_error(p + 1, -1, node);
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;
switch (disp->oper) {
case OPER_WRITE_PROP:
/*
* Convert the arguments into a single binary value, then
* store them into the property.
*/
assert(arg_count >= 2);
if (disp->auto_path && create_paths(blob, *arg))
return -1;
if (encode_value(disp, arg + 2, arg_count - 2, &value, &len) ||
store_key_value(blob, *arg, arg[1], value, len))
ret = -1;
break;
case OPER_CREATE_NODE:
for (; ret >= 0 && arg_count--; arg++) {
if (disp->auto_path)
ret = create_paths(blob, *arg);
else
ret = create_node(blob, *arg);
}
break;
}
if (ret >= 0)
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"
" fdtput -c <options> <dt file> [<node>...]\n"
"Options:\n"
"\t-c\t\tCreate nodes if they don't already exist\n"
"\t-p\t\tAutomatically create nodes as needed for the node path\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;
disp.oper = OPER_WRITE_PROP;
for (;;) {
int c = getopt(argc, argv, "chpt: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 'c':
disp.oper = OPER_CREATE_NODE;
break;
case 'h':
case '?':
usage(NULL);
case 'p':
disp.auto_path = 1;
break;
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 (disp.oper == OPER_WRITE_PROP) {
if (argc < 1)
usage("Missing node");
if (argc < 2)
usage("Missing property");
}
if (do_fdtput(&disp, filename, argv, argc))
return 1;
return 0;
}