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bbram_shell.c
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bbram_shell.c
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/*
* Copyright (c) 2022 Google Inc
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdlib.h>
#include <string.h>
#include <zephyr/devicetree.h>
#include <zephyr/drivers/bbram.h>
#include <zephyr/kernel.h>
#include <zephyr/shell/shell.h>
#include <zephyr/sys/util.h>
/* Buffer is only needed for bytes that follow command, device and address. */
#define BUF_ARRAY_CNT (CONFIG_SHELL_ARGC_MAX - 3)
static inline int parse_ul(const char *str, unsigned long *result)
{
char *end;
unsigned long val;
val = strtoul(str, &end, 0);
if (*str == '\0' || *end != '\0') {
return -EINVAL;
}
*result = val;
return 0;
}
static inline int parse_u32(const char *str, uint32_t *result)
{
unsigned long val;
if (parse_ul(str, &val) || val > 0xffffffff) {
return -EINVAL;
}
*result = (uint32_t)val;
return 0;
}
static inline int parse_u8(const char *str, uint8_t *result)
{
unsigned long val;
if (parse_ul(str, &val) || val > 0xff) {
return -EINVAL;
}
*result = (uint8_t)val;
return 0;
}
static inline int parse_device(const struct shell *sh, size_t argc, char *argv[],
const struct device **bbram_dev)
{
if (argc < 2) {
shell_error(sh, "Missing BBRAM device");
return -EINVAL;
}
*bbram_dev = device_get_binding(argv[1]);
if (!*bbram_dev) {
shell_error(sh, "Given BBRAM device was not found");
return -ENODEV;
}
return 0;
}
static int cmd_read(const struct shell *sh, size_t argc, char *argv[])
{
const struct device *bbram_dev;
uint32_t addr;
size_t size;
int part_size, ret;
ret = parse_device(sh, argc, argv, &bbram_dev);
if (ret) {
return ret;
}
if (argc < 3) {
/* Dump whole BBRAM if address not provided. */
addr = 0;
ret = bbram_get_size(bbram_dev, &size);
if (ret < 0) {
shell_error(sh, "Can't get BBRAM size: %d", ret);
return -EIO;
}
} else {
/* Parse address if provided. */
ret = parse_u32(argv[2], &addr);
if (ret) {
return ret;
}
/* If size not provided read one byte. */
size = 1;
if (argc >= 4) {
/* Parse size if provided. */
ret = parse_u32(argv[3], &size);
if (ret) {
return ret;
}
}
}
for (int cnt = 0; cnt < size; cnt += part_size) {
uint8_t data[SHELL_HEXDUMP_BYTES_IN_LINE];
part_size = MIN(size - cnt, SHELL_HEXDUMP_BYTES_IN_LINE);
ret = bbram_read(bbram_dev, addr, part_size, data);
if (ret != 0) {
shell_error(sh, "BBRAM read error: %d", ret);
return -EIO;
}
shell_hexdump_line(sh, addr, data, part_size);
addr += part_size;
}
shell_print(sh, "");
return 0;
}
static int cmd_write(const struct shell *sh, size_t argc, char *argv[])
{
const struct device *bbram_dev;
uint8_t buf[BUF_ARRAY_CNT];
uint32_t addr;
size_t size = 0;
int ret;
ret = parse_device(sh, argc, argv, &bbram_dev);
if (ret) {
return ret;
}
if (argc < 3) {
shell_error(sh, "Missing address");
return -EINVAL;
}
/* Parse address. */
ret = parse_u32(argv[2], &addr);
if (ret) {
return ret;
}
/* Parse bytes and place them in the buffer. */
for (int i = 3; i < argc; i++) {
ret = parse_u8(argv[i], &buf[i - 3]);
if (ret) {
return ret;
}
size++;
}
if (size == 0) {
shell_error(sh, "Missing data");
return -EINVAL;
}
ret = bbram_write(bbram_dev, addr, size, buf);
if (ret < 0) {
shell_error(sh, "BBRAM write error: %d", ret);
return -EIO;
}
return 0;
}
static void device_name_get(size_t idx, struct shell_static_entry *entry)
{
const struct device *dev = shell_device_lookup(idx, NULL);
entry->syntax = (dev != NULL) ? dev->name : NULL;
entry->handler = NULL;
entry->help = NULL;
entry->subcmd = NULL;
}
SHELL_DYNAMIC_CMD_CREATE(dsub_device_name, device_name_get);
SHELL_STATIC_SUBCMD_SET_CREATE(bbram_cmds,
SHELL_CMD_ARG(read, &dsub_device_name,
"<device> [<address>] [<count>]", cmd_read, 2, 2),
SHELL_CMD_ARG(write, &dsub_device_name,
"<device> <address> <byte> [<byte>...]", cmd_write, 4,
BUF_ARRAY_CNT),
SHELL_SUBCMD_SET_END);
static int cmd_bbram(const struct shell *sh, size_t argc, char **argv)
{
shell_error(sh, "%s: unknown parameter: %s", argv[0], argv[1]);
return -EINVAL;
}
SHELL_CMD_ARG_REGISTER(bbram, &bbram_cmds, "Battery-backed RAM shell commands", cmd_bbram, 2, 0);