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/* Copyright 2021 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/*
* This code is intended for developer use to convert a CrOS EC OS
* "gpio.inc" file into the expected device-tree format for Zephyr.
* The only use of it is to do a proof-of-concept build of a CrOS EC
* device using Zephyr OS, as Zephyr-only devices won't have a
* equivalent CrOS EC build.
*
* It does not handle all cases (i.e., low voltage selection), and
* some manual modifications to the output may be required.
*
**********************************************************************
* DO NOT CREATE TESTS, SYSTEMS, OR INFRASTRUCTURE WHICH RELIES ON *
* THIS CODE. It's seriously ugly code that's probably prone to *
* breakage. It leaks memory. In other words, consider it *
* "contrib-quality" code that should be deleted one day (once we are *
* no longer doing proof-of-concept Zephyr builds). *
**********************************************************************
*
* To compile:
* gcc -Iboard/${BOARD} -std=gnu11 util/gpios_to_zephyr_dts.c \
* -o /tmp/print_gpios
*
* Then run /tmp/print_gpios and paste the result into your gpio DTS
* overlay.
*/
#define _POSIX_C_SOURCE 200809L
#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
/*
* Implement the macros used in the gpio.inc files, but print DTS
* format equivalents.
*/
#define GPIO_INT_RISING GPIO_INPUT
#define GPIO_INT_FALLING GPIO_INPUT
#define GPIO_INT_BOTH GPIO_INPUT
#define GPIO_HIB_WAKE_HIGH 0
#define GPIO_HIB_WAKE_LOW 0
#define GPIO_LOCKED 0
#define GPIO_SEL_1P8V 0
#define GPIO_INT(name, pin, opts, int) GPIO(name, pin, opts)
#define GPIO(name, pin, opts) _gpio(#name, pin, opts)
#define UNUSED(pin)
#define UNIMPLEMENTED(name)
#define _gpio(name, pin, opts) \
printf("%s {\n\tgpios = <&%s %s>;\n\tlabel = %s;\n};\n", \
strlower(name), strlower(pin), \
maybe_parens(strip_zero_ors(#opts)), #name);
#define PIN(A, B) "gpio" #A " " #B
#define ALTERNATE(...)
#define IOEX(...)
#define IOEX_INT(...)
/* Strip out " | 0" and "0 | " from a string */
static char *strip_zero_ors(const char *s)
{
char *out = malloc(strlen(s) + 2);
const char *rd_ptr = s;
char *wr_ptr = out;
while (*rd_ptr) {
if (!strncmp(rd_ptr, " | 0", 4) ||
!strncmp(rd_ptr, "0 | ", 4)) {
rd_ptr += 4;
} else {
*wr_ptr = *rd_ptr;
rd_ptr++;
wr_ptr++;
}
}
*wr_ptr = '\0';
return out;
}
/*
* Add parenthesis around the outside of a string if it contains the
* '|' character.
*/
static char *maybe_parens(const char *s)
{
size_t out_sz = strlen(s) + 3;
char *out = malloc(out_sz);
if (strchr(s, '|'))
snprintf(out, out_sz, "(%s)", s);
else
snprintf(out, out_sz, "%s", s);
return out;
}
/* Convert a string to lowercase */
static char *strlower(const char *s)
{
char *out = strdup(s);
for (int i = 0; out[i]; i++)
out[i] = tolower(out[i]);
return out;
}
int main(int argc, char *argv[])
{
#include "gpio.inc"
return 0;
}
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