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77ba281c91
Marek Behún <kabel@kernel.org> says: This series contains improvements for the 'eeprom' command: - refactors - fixes - improvements - ability to use driver model EEPROMs (uclass UCLASS_I2C_EEPROM) - more flexible EEPROM layout support It should not cause any behavior change for any existing board. This series is a dependency for some DDR issue fixes for Turris Omnia. I will be sending that one separately. github PR link (with CI): https://github.com/u-boot/u-boot/pull/540 - there is a failure for test.py for sandbox sandbox_clang but it seems unrelated to these changes
140 lines
3.9 KiB
C
140 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2009-2016 CompuLab, Ltd.
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*
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* Authors: Nikita Kiryanov <nikita@compulab.co.il>
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* Igor Grinberg <grinberg@compulab.co.il>
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <eeprom_layout.h>
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#include <eeprom_field.h>
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#define NO_LAYOUT_FIELDS "Unknown layout. Dumping raw data\n"
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struct eeprom_field layout_unknown[1] = {
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{ NO_LAYOUT_FIELDS, 256, NULL, eeprom_field_print_bin,
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eeprom_field_update_bin },
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};
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/*
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* eeprom_layout_detect() - detect layout based on the contents of the data.
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* @data: Pointer to the data to be analyzed.
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*
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* Returns: the detected layout version.
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*/
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__weak int eeprom_layout_detect(unsigned char *data)
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{
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return LAYOUT_VERSION_UNRECOGNIZED;
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}
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/*
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* __eeprom_layout_assign() - set the layout fields
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* @layout: A pointer to an existing struct layout.
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* @layout_version: The version number of the desired layout
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*/
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__weak void __eeprom_layout_assign(struct eeprom_layout *layout,
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int layout_version)
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{
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layout->fields = layout_unknown;
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layout->num_of_fields = ARRAY_SIZE(layout_unknown);
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}
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void eeprom_layout_assign(struct eeprom_layout *layout, int layout_version) \
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__attribute__((weak, alias("__eeprom_layout_assign")));
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/*
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* eeprom_layout_print() - print the layout and the data which is assigned to it
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* @layout: A pointer to an existing struct layout.
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*/
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static void eeprom_layout_print(const struct eeprom_layout *layout)
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{
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int i;
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struct eeprom_field *fields = layout->fields;
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for (i = 0; i < layout->num_of_fields; i++)
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fields[i].print(&fields[i]);
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}
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/*
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* eeprom_layout_find_field() - finds a layout field by name
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* @layout: A pointer to an existing struct layout.
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* @field_name: The name of the field to update.
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* @warn: Whether to print a warning if the field is not found.
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*
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* Returns: a pointer to the found field or NULL on failure.
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*/
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struct eeprom_field *eeprom_layout_find_field(struct eeprom_layout *layout,
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char *field_name, bool warn)
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{
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for (int i = 0; i < layout->num_of_fields; i++)
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if (layout->fields[i].name != RESERVED_FIELDS &&
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!strcmp(layout->fields[i].name, field_name))
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return &layout->fields[i];
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if (warn)
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printf("No such field '%s'\n", field_name);
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return NULL;
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}
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/*
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* eeprom_layout_update_field() - update a single field in the layout data.
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* @layout: A pointer to an existing struct layout.
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* @field_name: The name of the field to update.
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* @new_data: The new field data (a string. Format depends on the field)
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*
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* Returns: 0 on success, negative error value on failure.
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*/
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static int eeprom_layout_update_field(struct eeprom_layout *layout,
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char *field_name, char *new_data)
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{
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struct eeprom_field *field;
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int err;
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if (new_data == NULL)
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return 0;
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if (field_name == NULL)
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return -1;
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field = eeprom_layout_find_field(layout, field_name, true);
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if (field == NULL)
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return -1;
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err = field->update(field, new_data);
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if (err)
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printf("Invalid data for field %s\n", field_name);
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return err;
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}
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/*
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* eeprom_layout_setup() - setup layout struct with the layout data and
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* metadata as dictated by layout_version
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* @layout: A pointer to an existing struct layout.
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* @buf: A buffer initialized with the eeprom data.
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* @buf_size: Size of buf in bytes.
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* @layout version: The version number of the layout.
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*/
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void eeprom_layout_setup(struct eeprom_layout *layout, unsigned char *buf,
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unsigned int buf_size, int layout_version)
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{
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int i;
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if (layout_version == LAYOUT_VERSION_AUTODETECT)
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layout->layout_version = eeprom_layout_detect(buf);
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else
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layout->layout_version = layout_version;
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layout->data_size = buf_size;
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layout->print = eeprom_layout_print;
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layout->update = eeprom_layout_update_field;
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eeprom_layout_assign(layout, layout_version);
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layout->data = buf;
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for (i = 0; i < layout->num_of_fields; i++) {
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layout->fields[i].buf = buf;
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buf += layout->fields[i].size;
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}
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}
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