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/* Copyright (c) 2012 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.
*/
/* Persistent EC options stored in EEPROM */
#include "console.h"
#include "eeprom.h"
#include "eoption.h"
#include "util.h"
#define EOPTION_MAGIC 0x456f /* Magic number for header 'Eo' */
#define EOPTION_VERSION_CURRENT 1 /* Current version of options data */
struct eoption_bool_data {
int offset; /* Word offset of option */
int mask; /* Option mask within byte */
const char *name; /* Option name */
};
/* Word offsets inside the EOPTION EEPROM block */
enum block_offsets {
OFFSET_HEADER = 0,
OFFSET_BOOL0,
};
/*
* Boolean options. Must be in the same order as enum eoption_bool, and must
* be terminated by an entry with a NULL name.
*/
static const struct eoption_bool_data bool_opts[] = {
{OFFSET_BOOL0, (1 << 0), "bool_test"},
{0, 0, NULL},
};
/**
* Read a uint32_t from the specified EEPROM word offset.
*/
static int read32(int offset, uint32_t *dest)
{
return eeprom_read(EEPROM_BLOCK_EOPTION, offset * 4, sizeof(uint32_t),
(char *)dest);
}
/**
* Write a uint32_t to the specified EEPROM word offset.
*/
static int write32(int offset, uint32_t v)
{
return eeprom_write(EEPROM_BLOCK_EOPTION, offset * 4, sizeof(v),
(char *)&v);
}
int eoption_get_bool(enum eoption_bool opt)
{
const struct eoption_bool_data *d = bool_opts + opt;
uint32_t v = 0;
read32(d->offset, &v);
return v & d->mask ? 1 : 0;
}
int eoption_set_bool(enum eoption_bool opt, int value)
{
const struct eoption_bool_data *d = bool_opts + opt;
uint32_t v;
int rv;
rv = read32(d->offset, &v);
if (rv != EC_SUCCESS)
return rv;
if (value)
v |= d->mask;
else
v &= ~d->mask;
return write32(d->offset, v);
}
/**
* Find an option by name.
*
* @return The option index, or -1 if no match.
*/
static int find_option_by_name(const char *name,
const struct eoption_bool_data *d)
{
int i;
if (!name || !*name)
return -1;
for (i = 0; d->name; i++, d++) {
if (!strcasecmp(name, d->name))
return i;
}
return -1;
}
void eoption_init(void)
{
uint32_t v;
int version;
/* Initialize EEPROM if necessary */
read32(OFFSET_HEADER, &v);
/* Check header */
if (v >> 16 != EOPTION_MAGIC)
v = EOPTION_MAGIC << 16; /* (implicitly sets version=0) */
version = (v >> 8) & 0xff;
if (version == EOPTION_VERSION_CURRENT)
return;
/*
* TODO(crosbug.com/p/23558): The header should really have a checksum
* field, so that we can detect uninitialized/corrupt data.
*/
/* Initialize fields which weren't set in previous versions */
if (version < 1)
write32(OFFSET_BOOL0, 0);
/* Update the header */
v = (v & ~0xff00) | (EOPTION_VERSION_CURRENT << 8);
write32(OFFSET_HEADER, v);
}
/*****************************************************************************/
/* Console commands */
static int command_eoption_get(int argc, char **argv)
{
const struct eoption_bool_data *d;
int i;
/* If a signal is specified, print only that one */
if (argc == 2) {
i = find_option_by_name(argv[1], bool_opts);
if (i == -1)
return EC_ERROR_PARAM1;
d = bool_opts + i;
ccprintf(" %d %s\n", eoption_get_bool(i), d->name);
return EC_SUCCESS;
}
/* Otherwise print them all */
for (i = 0, d = bool_opts; d->name; i++, d++) {
ccprintf(" %d %s\n", eoption_get_bool(i), d->name);
/* We have enough options that we'll overflow the output buffer
* without flushing */
cflush();
}
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(optget, command_eoption_get,
"[name]",
"Print EC option(s)",
NULL);
static int command_eoption_set(int argc, char **argv)
{
char *e;
int v, i;
if (argc < 3)
return EC_ERROR_PARAM_COUNT;
v = strtoi(argv[2], &e, 0);
if (*e)
return EC_ERROR_PARAM2;
i = find_option_by_name(argv[1], bool_opts);
if (i == -1)
return EC_ERROR_PARAM1;
return eoption_set_bool(i, v);
}
DECLARE_CONSOLE_COMMAND(optset, command_eoption_set,
"name value",
"Set EC option",
NULL);
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