cmd: eeprom: add support for layout aware commands
Introduce the (optional) eeprom print and eeprom update commands.
These commands are eeprom layout aware:
* The eeprom print command prints the contents of the eeprom in a human
readable way (eeprom layout fields, and data formatted to be fit for human
consumption).
* The eeprom update command allows user to update eeprom fields by specifying
the field name, and providing the new data in a human readable format (same
format as displayed by the eeprom print command).
* Both commands can either auto detect the layout, or be told which layout to
use.
New CONFIG options:
CONFIG_CMD_EEPROM_LAYOUT - enables commands.
CONFIG_EEPROM_LAYOUT_HELP_STRING - tells user what layout names are supported
Feature API:
__weak int parse_layout_version(char *str)
- override to provide your own layout name parsing
__weak void __eeprom_layout_assign(struct eeprom_layout *layout, int layout_version);
- override to setup the layout metadata based on the version
__weak int eeprom_layout_detect(unsigned char *data)
- override to provide your own algorithm for detecting layout version
eeprom_field.c
- contains various printing and updating functions for common types of
eeprom fields. Can be used for defining custom layouts.
Cc: Heiko Schocher <hs@denx.de>
Cc: Marek Vasut <marex@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Igor Grinberg <grinberg@compulab.co.il>
Cc: Tom Rini <trini@konsulko.com>
Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
diff --git a/common/eeprom/eeprom_field.c b/common/eeprom/eeprom_field.c
new file mode 100644
index 0000000..7f095a6
--- /dev/null
+++ b/common/eeprom/eeprom_field.c
@@ -0,0 +1,250 @@
+/*
+ * (C) Copyright 2009-2016 CompuLab, Ltd.
+ *
+ * Authors: Nikita Kiryanov <nikita@compulab.co.il>
+ * Igor Grinberg <grinberg@compulab.co.il>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <linux/string.h>
+#include <eeprom_field.h>
+
+static void __eeprom_field_print_bin(const struct eeprom_field *field,
+ char *delimiter, bool reverse)
+{
+ int i;
+ int from = reverse ? field->size - 1 : 0;
+ int to = reverse ? 0 : field->size - 1;
+
+ printf(PRINT_FIELD_SEGMENT, field->name);
+ for (i = from; i != to; reverse ? i-- : i++)
+ printf("%02x%s", field->buf[i], delimiter);
+
+ printf("%02x\n", field->buf[i]);
+}
+
+static int __eeprom_field_update_bin(struct eeprom_field *field,
+ const char *value, bool reverse)
+{
+ int len = strlen(value);
+ int k, j, i = reverse ? len - 1 : 0;
+ unsigned char byte;
+ char *endptr;
+
+ /* each two characters in the string fit in one byte */
+ if (len > field->size * 2)
+ return -1;
+
+ memset(field->buf, 0, field->size);
+
+ /* i - string iterator, j - buf iterator */
+ for (j = 0; j < field->size; j++) {
+ byte = 0;
+ char tmp[3] = { 0, 0, 0 };
+
+ if ((reverse && i < 0) || (!reverse && i >= len))
+ break;
+
+ for (k = 0; k < 2; k++) {
+ if (reverse && i == 0) {
+ tmp[k] = value[i];
+ break;
+ }
+
+ tmp[k] = value[reverse ? i - 1 + k : i + k];
+ }
+
+ byte = simple_strtoul(tmp, &endptr, 0);
+ if (*endptr != '\0' || byte < 0)
+ return -1;
+
+ field->buf[j] = byte;
+ i = reverse ? i - 2 : i + 2;
+ }
+
+ return 0;
+}
+
+static int __eeprom_field_update_bin_delim(struct eeprom_field *field,
+ char *value, char *delimiter)
+{
+ int count = 0;
+ int i, val;
+ const char *tmp = value;
+ char *tok;
+ char *endptr;
+
+ tmp = strstr(tmp, delimiter);
+ while (tmp != NULL) {
+ count++;
+ tmp++;
+ tmp = strstr(tmp, delimiter);
+ }
+
+ if (count > field->size)
+ return -1;
+
+ tok = strtok(value, delimiter);
+ for (i = 0; tok && i < field->size; i++) {
+ val = simple_strtoul(tok, &endptr, 0);
+ if (*endptr != '\0')
+ return -1;
+
+ /* here we assume that each tok is no more than byte long */
+ field->buf[i] = (unsigned char)val;
+ tok = strtok(NULL, delimiter);
+ }
+
+ return 0;
+}
+
+/**
+ * eeprom_field_print_bin() - print a field which contains binary data
+ *
+ * Treat the field data as simple binary data, and print it as two digit
+ * hexadecimal values.
+ * Sample output:
+ * Field Name 0102030405060708090a
+ *
+ * @field: an initialized field to print
+ */
+void eeprom_field_print_bin(const struct eeprom_field *field)
+{
+ __eeprom_field_print_bin(field, "", false);
+}
+
+/**
+ * eeprom_field_update_bin() - Update field with new data in binary form
+ *
+ * @field: an initialized field
+ * @value: a string of values (i.e. "10b234a")
+ */
+int eeprom_field_update_bin(struct eeprom_field *field, char *value)
+{
+ return __eeprom_field_update_bin(field, value, false);
+}
+
+/**
+ * eeprom_field_update_reserved() - Update reserved field with new data in
+ * binary form
+ *
+ * @field: an initialized field
+ * @value: a space delimited string of byte values (i.e. "1 02 3 0x4")
+ */
+int eeprom_field_update_reserved(struct eeprom_field *field, char *value)
+{
+ return __eeprom_field_update_bin_delim(field, value, " ");
+}
+
+/**
+ * eeprom_field_print_bin_rev() - print a field which contains binary data in
+ * reverse order
+ *
+ * Treat the field data as simple binary data, and print it in reverse order
+ * as two digit hexadecimal values.
+ *
+ * Data in field:
+ * 0102030405060708090a
+ * Sample output:
+ * Field Name 0a090807060504030201
+ *
+ * @field: an initialized field to print
+ */
+void eeprom_field_print_bin_rev(const struct eeprom_field *field)
+{
+ __eeprom_field_print_bin(field, "", true);
+}
+
+/**
+ * eeprom_field_update_bin_rev() - Update field with new data in binary form,
+ * storing it in reverse
+ *
+ * This function takes a string of byte values, and stores them
+ * in the field in the reverse order. i.e. if the input string was "1234",
+ * "3412" will be written to the field.
+ *
+ * @field: an initialized field
+ * @value: a string of byte values
+ */
+int eeprom_field_update_bin_rev(struct eeprom_field *field, char *value)
+{
+ return __eeprom_field_update_bin(field, value, true);
+}
+
+/**
+ * eeprom_field_print_mac_addr() - print a field which contains a mac address
+ *
+ * Treat the field data as simple binary data, and print it formatted as a MAC
+ * address.
+ * Sample output:
+ * Field Name 01:02:03:04:05:06
+ *
+ * @field: an initialized field to print
+ */
+void eeprom_field_print_mac(const struct eeprom_field *field)
+{
+ __eeprom_field_print_bin(field, ":", false);
+}
+
+/**
+ * eeprom_field_update_mac() - Update a mac address field which contains binary
+ * data
+ *
+ * @field: an initialized field
+ * @value: a colon delimited string of byte values (i.e. "1:02:3:ff")
+ */
+int eeprom_field_update_mac(struct eeprom_field *field, char *value)
+{
+ return __eeprom_field_update_bin_delim(field, value, ":");
+}
+
+/**
+ * eeprom_field_print_ascii() - print a field which contains ASCII data
+ * @field: an initialized field to print
+ */
+void eeprom_field_print_ascii(const struct eeprom_field *field)
+{
+ char format[8];
+
+ sprintf(format, "%%.%ds\n", field->size);
+ printf(PRINT_FIELD_SEGMENT, field->name);
+ printf(format, field->buf);
+}
+
+/**
+ * eeprom_field_update_ascii() - Update field with new data in ASCII form
+ * @field: an initialized field
+ * @value: the new string data
+ *
+ * Returns 0 on success, -1 of failure (new string too long).
+ */
+int eeprom_field_update_ascii(struct eeprom_field *field, char *value)
+{
+ if (strlen(value) >= field->size) {
+ printf("%s: new data too long\n", field->name);
+ return -1;
+ }
+
+ strncpy((char *)field->buf, value, field->size - 1);
+ field->buf[field->size - 1] = '\0';
+
+ return 0;
+}
+
+/**
+ * eeprom_field_print_reserved() - print the "Reserved fields" field
+ *
+ * Print a notice that the following field_size bytes are reserved.
+ *
+ * Sample output:
+ * Reserved fields (64 bytes)
+ *
+ * @field: an initialized field to print
+ */
+void eeprom_field_print_reserved(const struct eeprom_field *field)
+{
+ printf(PRINT_FIELD_SEGMENT, "Reserved fields\t");
+ printf("(%d bytes)\n", field->size);
+}