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/* Copyright (c) 2019, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/habmm.h>
#include "pfk_ice.h"
/**********************************/
/** global definitions **/
/**********************************/
#define AES256_KEY_SIZE (32)
#define RESERVE_SIZE (36*sizeof(uint16_t))
/* FBE request command ids */
#define FDE_CMD_SET_KEY (0)
#define FDE_CMD_UPDATE_PASSWORD (1)
#define FDE_CMD_CLEAR_KEY (2)
#define FDE_CMD_WIPE_KEY (3)
#define FDE_SET_ICE (4)
#define FBE_SET_KEY (5)
#define FBE_CLEAR_KEY (6)
#define FBE_GET_MAX_SLOTS (7)
struct fbe_request_t {
uint8_t reserve[RESERVE_SIZE]; // for compatibility
uint32_t cmd;
uint8_t key[AES256_KEY_SIZE];
uint8_t salt[AES256_KEY_SIZE];
uint32_t virt_slot;
};
static int32_t send_fbe_req(struct fbe_request_t *req, int32_t *status)
{
int ret = 0;
uint32_t status_size;
uint32_t handle;
if (!req || !status) {
pr_err("%s Null input\n", __func__);
return -EINVAL;
}
ret = habmm_socket_open(&handle, MM_FDE_1, 0, 0);
if (ret) {
pr_err("habmm_socket_open failed with ret = %d\n", ret);
return ret;
}
ret = habmm_socket_send(handle, req, sizeof(*req), 0);
if (ret) {
pr_err("habmm_socket_send failed, ret= 0x%x\n", ret);
return ret;
}
do {
status_size = sizeof(*status);
ret = habmm_socket_recv(handle, status, &status_size, 0,
HABMM_SOCKET_RECV_FLAGS_UNINTERRUPTIBLE);
} while (-EINTR == ret);
if (ret) {
pr_err("habmm_socket_recv failed, ret= 0x%x\n", ret);
return ret;
}
if (status_size != sizeof(*status)) {
pr_err("habmm_socket_recv expected size: %lu, actual=%u\n",
sizeof(*status),
status_size);
return -E2BIG;
}
ret = habmm_socket_close(handle);
if (ret) {
pr_err("habmm_socket_close failed with ret = %d\n", ret);
return ret;
}
return 0;
}
int qti_pfk_ice_set_key(uint32_t index, uint8_t *key, uint8_t *salt,
char *storage_type, unsigned int data_unit)
{
struct fbe_request_t req;
int32_t ret = 0, status = 0;
if (!key || !salt) {
pr_err("%s Invalid key/salt\n", __func__);
return -EINVAL;
}
req.cmd = FBE_SET_KEY;
req.virt_slot = index;
memcpy(&(req.key[0]), key, AES256_KEY_SIZE);
memcpy(&(req.salt[0]), salt, AES256_KEY_SIZE);
ret = send_fbe_req(&req, &status);
if (ret || status) {
pr_err("send_fbe_req failed with ret = %d, status = %d\n",
ret, status);
return -ECOMM;
}
return 0;
}
int qti_pfk_ice_invalidate_key(uint32_t index, char *storage_type)
{
struct fbe_request_t req;
int32_t ret = 0, status = 0;
req.cmd = FBE_CLEAR_KEY;
req.virt_slot = index;
ret = send_fbe_req(&req, &status);
if (ret || status) {
pr_err("send_fbe_req failed with ret = %d, status = %d\n",
ret, status);
return -ECOMM;
}
return 0;
}
int qti_pfk_ice_get_info(uint32_t *min_slot_index, uint32_t *total_num_slots,
bool async)
{
struct fbe_request_t req;
int32_t ret = 0, max_slots = 0;
if (!min_slot_index || !total_num_slots) {
pr_err("%s Null input\n", __func__);
return -EINVAL;
}
if (async)
return -EAGAIN;
req.cmd = FBE_GET_MAX_SLOTS;
ret = send_fbe_req(&req, &max_slots);
if (ret || max_slots < 0) {
pr_err("send_fbe_req failed with ret = %d, max_slots = %d\n",
ret, max_slots);
return -ECOMM;
}
*min_slot_index = 0;
*total_num_slots = (uint32_t) max_slots;
return 0;
}
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