1 /* 2 * I2C Driver for Atmel ATSHA204 over I2C 3 * 4 * Copyright (C) 2014 Josh Datko, Cryptotronix, jbd@cryptotronix.com 5 * 2016 Tomas Hlavacek, CZ.NIC, tmshlvck@gmail.com 6 * 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 #ifndef _ATSHA204_I2C_H_ 13 #define _ATSHA204_I2C_H_ 14 15 enum atsha204a_zone 16 { 17 ATSHA204A_ZONE_CONFIG = 0, 18 ATSHA204A_ZONE_OTP = 1, 19 ATSHA204A_ZONE_DATA = 2, 20 }; 21 22 enum atsha204a_status 23 { 24 ATSHA204A_STATUS_SUCCESS = 0x00, 25 ATSHA204A_STATUS_MISCOMPARE = 0x01, 26 ATSHA204A_STATUS_PARSE_ERROR = 0x03, 27 ATSHA204A_STATUS_EXEC_ERROR = 0x0F, 28 ATSHA204A_STATUS_AFTER_WAKE = 0x11, 29 ATSHA204A_STATUS_CRC_ERROR = 0xFF, 30 }; 31 32 enum atsha204a_func 33 { 34 ATSHA204A_FUNC_RESET = 0x00, 35 ATSHA204A_FUNC_SLEEP = 0x01, 36 ATSHA204A_FUNC_IDLE = 0x02, 37 ATSHA204A_FUNC_COMMAND = 0x03, 38 }; 39 40 enum atsha204a_cmd 41 { 42 ATSHA204A_CMD_READ = 0x02, 43 ATSHA204A_CMD_RANDOM = 0x1B, 44 }; 45 46 struct atsha204a_resp 47 { 48 u8 length; 49 u8 code; 50 u8 data[82]; 51 } __attribute__ ((packed)); 52 53 struct atsha204a_req 54 { 55 u8 function; 56 u8 length; 57 u8 command; 58 u8 param1; 59 u16 param2; 60 u8 data[78]; 61 } __attribute__ ((packed)); 62 63 int atsha204a_wakeup(struct udevice *); 64 int atsha204a_idle(struct udevice *); 65 int atsha204a_sleep(struct udevice *); 66 int atsha204a_read(struct udevice *, enum atsha204a_zone, bool, u16, u8 *); 67 int atsha204a_get_random(struct udevice *, u8 *, size_t); 68 69 #endif /* _ATSHA204_I2C_H_ */ 70