include/atsha204a-i2c.h

   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 Behún, CZ.NIC, kabel@kernel.org
   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_ */