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// SPDX-License-Identifier: GPL-2.0+/* * EEPROM driver for RAVE SP * * Copyright (C) 2018 Zodiac Inflight Innovations * *//** * enum rave_sp_eeprom_access_type - Supported types of EEPROM access * * @RAVE_SP_EEPROM_WRITE: EEPROM write * @RAVE_SP_EEPROM_READ: EEPROM read */enum rave_sp_eeprom_access_type { RAVE_SP_EEPROM_WRITE = 0, RAVE_SP_EEPROM_READ = 1,};/** * enum rave_sp_eeprom_header_size - EEPROM command header sizes * * @RAVE_SP_EEPROM_HEADER_SMALL: EEPROM header size for "small" devices (< 8K) * @RAVE_SP_EEPROM_HEADER_BIG: EEPROM header size for "big" devices (> 8K) */enum rave_sp_eeprom_header_size { RAVE_SP_EEPROM_HEADER_SMALL = 4U, RAVE_SP_EEPROM_HEADER_BIG = 5U,};/** * struct rave_sp_eeprom_page - RAVE SP EEPROM page * * @type: Access type (see enum rave_sp_eeprom_access_type) * @success: Success flag (Success = 1, Failure = 0) * @data: Read data * Note this structure corresponds to RSP_*_EEPROM payload from RAVE * SP ICD */struct rave_sp_eeprom_page { u8 type; u8 success; u8 data[RAVE_SP_EEPROM_PAGE_SIZE];} __packed;/** * struct rave_sp_eeprom - RAVE SP EEPROM device * * @sp: Pointer to parent RAVE SP device * @mutex: Lock protecting access to EEPROM * @address: EEPROM device address * @header_size: Size of EEPROM command header for this device * @dev: Pointer to corresponding struct device used for logging */struct rave_sp_eeprom { struct rave_sp *sp; struct mutex mutex; u8 address; unsigned int header_size; struct device *dev;};/** * rave_sp_eeprom_io - Low-level part of EEPROM page access * * @eeprom: EEPROM device to write to * @type: EEPROM access type (read or write) * @idx: number of the EEPROM page * @page: Data to write or buffer to store result (via page->data) * * This function does all of the low-level work required to perform a * EEPROM access. This includes formatting correct command payload, * sending it and checking received results. * * Returns zero in case of success or negative error code in * case of failure. */static int rave_sp_eeprom_io(struct rave_sp_eeprom *eeprom, enum rave_sp_eeprom_access_type type, u16 idx,