drivers/staging/ccree/ssi_fips_ext.c

   1 /*
   2  * Copyright (C) 2012-2017 ARM Limited or its affiliates.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 /**************************************************************
  18  * This file defines the driver FIPS functions that should be
  19  * implemented by the driver user. Current implementation is sample code only.
  20  ***************************************************************/
  21
  22 #include <linux/module.h>
  23 #include "ssi_fips_local.h"
  24 #include "ssi_driver.h"
  25
  26
  27 static bool tee_error;
  28 module_param(tee_error, bool, 0644);
  29 MODULE_PARM_DESC(tee_error, "Simulate TEE library failure flag: 0 - no error (default), 1 - TEE error occured ");
  30
  31 static ssi_fips_state_t fips_state = CC_FIPS_STATE_NOT_SUPPORTED;
  32 static ssi_fips_error_t fips_error = CC_REE_FIPS_ERROR_OK;
  33
  34 /*
  35  * This function returns the FIPS REE state.
  36  * The function should be implemented by the driver user, depends on where
  37  * the state value is stored.
  38  * The reference code uses global variable.
  39  */
  40 int ssi_fips_ext_get_state(ssi_fips_state_t *p_state)
  41 {
  42         int rc = 0;
  43
  44         if (p_state == NULL) {
  45                 return -EINVAL;
  46         }
  47
  48         *p_state = fips_state;
  49
  50         return rc;
  51 }
  52
  53 /*
  54  * This function returns the FIPS REE error.
  55  * The function should be implemented by the driver user, depends on where
  56  * the error value is stored.
  57  * The reference code uses global variable.
  58  */
  59 int ssi_fips_ext_get_error(ssi_fips_error_t *p_err)
  60 {
  61         int rc = 0;
  62
  63         if (p_err == NULL) {
  64                 return -EINVAL;
  65         }
  66
  67         *p_err = fips_error;
  68
  69         return rc;
  70 }
  71
  72 /*
  73  * This function sets the FIPS REE state.
  74  * The function should be implemented by the driver user, depends on where
  75  * the state value is stored.
  76  * The reference code uses global variable.
  77  */
  78 int ssi_fips_ext_set_state(ssi_fips_state_t state)
  79 {
  80         fips_state = state;
  81         return 0;
  82 }
  83
  84 /*
  85  * This function sets the FIPS REE error.
  86  * The function should be implemented by the driver user, depends on where
  87  * the error value is stored.
  88  * The reference code uses global variable.
  89  */
  90 int ssi_fips_ext_set_error(ssi_fips_error_t err)
  91 {
  92         fips_error = err;
  93         return 0;
  94 }
  95
  96