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/*
* drivers/soc/samsung/exynos-hdcp/dp_link/exynos-hdcp2-dplink.c
*
* Copyright (c) 2015 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/smc.h>
#include <asm/cacheflush.h>
#include <linux/soc/samsung/exynos-smc.h>
#include <linux/types.h>
#include <linux/delay.h>
#include "exynos-hdcp2.h"
#include "exynos-hdcp2-log.h"
#include "exynos-hdcp2-dplink.h"
#include "exynos-hdcp2-dplink-if.h"
#include "exynos-hdcp2-dplink-auth.h"
#include "exynos-hdcp2-dplink-inter.h"
#include "exynos-hdcp2-teeif.h"
#define HDCP_AUTH_RETRY_COUNT 5
#define RECVID_WAIT_RETRY_COUNT 5
static DEFINE_MUTEX(hdcp_auth_mutex);
/* current link data */
static struct hdcp_link_data *lk_data;
extern uint8_t rp_ready;
extern enum auth_state auth_proc_state;
static struct hdcp_sess_info ss_info;
static struct hdcp_link_info lk_info;
int hdcp_dplink_get_rxinfo(uint8_t *status)
{
int ret = 0;
ret = hdcp_dplink_recv(HDCP22_MSG_RXSTATUS_R, status, sizeof(uint8_t));
hdcp_info("RxStatus: %x\n", *status);
return ret;
}
int do_dplink_auth(struct hdcp_link_info *lk_handle)
{
struct hdcp_session_node *ss_node;
struct hdcp_link_node *lk_node;
int ret = HDCP_SUCCESS;
int rval = TX_AUTH_SUCCESS;
uint32_t retry_recvid = 0;
int hdcp_enabled = 0;
/* find Session node which contains the Link */
if (!rp_ready) {
ss_node = hdcp_session_list_find(lk_handle->ss_id);
if (!ss_node)
return HDCP_ERROR_INVALID_INPUT;
lk_node = hdcp_link_list_find(lk_handle->lk_id, &ss_node->ss_data->ln);
if (!lk_node)
return HDCP_ERROR_INVALID_INPUT;
lk_data = lk_node->lk_data;
if (!lk_data)
return HDCP_ERROR_INVALID_INPUT;
if (lk_data->state != LINK_ST_H1_TX_LOW_VALUE_CONTENT)
return HDCP_ERROR_INVALID_STATE;
}
/**
* if Upstream Content Control Function call this API,
* it changes state to ST_A0_DETERMINE_RX_HDCP_CAP automatically.
* HDCP library do not check CP desire.
*/
if (!lk_data) {
hdcp_info("DP HDCP2.2 Session is not opened.\n");
return HDCP_ERROR_INVALID_INPUT;
}
if (rp_ready)
UPDATE_LINK_STATE(lk_data, LINK_ST_A7_VERIFY_RECEIVER_ID_LIST);
else
UPDATE_LINK_STATE(lk_data, LINK_ST_A0_DETERMINE_RX_HDCP_CAP);
do {
switch (lk_data->state) {
case LINK_ST_H1_TX_LOW_VALUE_CONTENT:
hdcp_dplink_config(DP_HDCP22_DISABLE);
return ret;
case LINK_ST_A0_DETERMINE_RX_HDCP_CAP:
if (dplink_determine_rx_hdcp_cap(lk_data) < 0) {
ret = HDCP_ERROR_RX_NOT_HDCP_CAPABLE;
UPDATE_LINK_STATE(lk_data, LINK_ST_H1_TX_LOW_VALUE_CONTENT);
} else
UPDATE_LINK_STATE(lk_data, LINK_ST_A1_EXCHANGE_MASTER_KEY);
break;
case LINK_ST_A1_EXCHANGE_MASTER_KEY:
rval = dplink_exchange_master_key(lk_data);
if (rval == TX_AUTH_SUCCESS) {
UPDATE_LINK_STATE(lk_data, LINK_ST_A2_LOCALITY_CHECK);
} else {
/* todo: consider connection retry */
ret = HDCP_ERROR_EXCHANGE_KM;
UPDATE_LINK_STATE(lk_data, LINK_ST_H1_TX_LOW_VALUE_CONTENT);
}
break;
case LINK_ST_A2_LOCALITY_CHECK:
rval = dplink_locality_check(lk_data);
if (rval == TX_AUTH_SUCCESS) {
UPDATE_LINK_STATE(lk_data, LINK_ST_A3_EXCHANGE_SESSION_KEY);
} else {
/* todo: consider connection retry */
ret = HDCP_ERROR_LOCALITY_CHECK;
UPDATE_LINK_STATE(lk_data, LINK_ST_H1_TX_LOW_VALUE_CONTENT);
}
break;
case LINK_ST_A3_EXCHANGE_SESSION_KEY:
if (dplink_exchange_session_key(lk_data) < 0) {
ret = HDCP_ERROR_EXCHANGE_KS;
UPDATE_LINK_STATE(lk_data, LINK_ST_H1_TX_LOW_VALUE_CONTENT);
} else {
UPDATE_LINK_STATE(lk_data, LINK_ST_A4_TEST_REPEATER);
}
break;
case LINK_ST_A4_TEST_REPEATER:
if (dplink_evaluate_repeater(lk_data) == TRUE) {
/* if it is a repeater, verify Rcv ID list */
UPDATE_LINK_STATE(lk_data, LINK_ST_A6_WAIT_RECEIVER_ID_LIST);
hdcp_info("It`s repeater link !\n");
hdcp_enabled = 0;
} else {
/* if it is not a repeater, complete authentication */
UPDATE_LINK_STATE(lk_data, LINK_ST_A5_AUTHENTICATED);
hdcp_info("It`s Rx link !\n");
hdcp_enabled = 1;
}
break;
case LINK_ST_A5_AUTHENTICATED:
/* HDCP2.2 spec defined 200ms */
msleep(200);
if (hdcp_enabled)
hdcp_dplink_config(DP_HDCP22_ENABLE);
/* Transmitter has completed the authentication protocol */
ret = hdcp_tee_enable_enc_22();
return HDCP_SUCCESS;
case LINK_ST_A6_WAIT_RECEIVER_ID_LIST:
rval = dplink_wait_for_receiver_id_list(lk_data);
if (rval == -TX_AUTH_ERROR_TIME_EXCEED) {
if (retry_recvid < RECVID_WAIT_RETRY_COUNT) {
/* retry hdcp authentication in case of timeout */
hdcp_dplink_config(DP_HDCP22_DISABLE);
UPDATE_LINK_STATE(lk_data, LINK_ST_A0_DETERMINE_RX_HDCP_CAP);
hdcp_info("retry authentication. (%d)\n", retry_recvid);
retry_recvid++;
} else {
hdcp_info("exceed retry count. (%d)\n", retry_recvid);
ret = HDCP_ERROR_VERIFY_RECEIVER_ID_LIST;
UPDATE_LINK_STATE(lk_data, LINK_ST_H1_TX_LOW_VALUE_CONTENT);
}
} else if (rval == HDCP_SUCCESS) {
UPDATE_LINK_STATE(lk_data, LINK_ST_A7_VERIFY_RECEIVER_ID_LIST);
retry_recvid = 0;
} else {
/* error on recevier id list wait */
ret = HDCP_ERROR_VERIFY_RECEIVER_ID_LIST;
UPDATE_LINK_STATE(lk_data, LINK_ST_H1_TX_LOW_VALUE_CONTENT);
}
break;
case LINK_ST_A7_VERIFY_RECEIVER_ID_LIST:
if (dplink_verify_receiver_id_list(lk_data) < 0) {
ret = HDCP_ERROR_VERIFY_RECEIVER_ID_LIST;
UPDATE_LINK_STATE(lk_data, LINK_ST_H1_TX_LOW_VALUE_CONTENT);
} else {
UPDATE_LINK_STATE(lk_data, LINK_ST_A8_SEND_RECEIVER_ID_LIST_ACK);
}
break;
case LINK_ST_A8_SEND_RECEIVER_ID_LIST_ACK:
rval = dplink_send_receiver_id_list_ack(lk_data);
if (rval < 0) {
ret = HDCP_ERROR_VERIFY_RECEIVER_ID_LIST;
UPDATE_LINK_STATE(lk_data, LINK_ST_H1_TX_LOW_VALUE_CONTENT);
} else {
UPDATE_LINK_STATE(lk_data, LINK_ST_A9_CONTENT_STREAM_MGT);
}
break;
case LINK_ST_A9_CONTENT_STREAM_MGT:
rval = dplink_stream_manage(lk_data);
if (rval < 0) {
ret = HDCP_ERROR_STREAM_MANAGE;
UPDATE_LINK_STATE(lk_data, LINK_ST_H1_TX_LOW_VALUE_CONTENT);
} else {
UPDATE_LINK_STATE(lk_data, LINK_ST_A5_AUTHENTICATED);
auth_proc_state = HDCP2_AUTH_PROCESS_DONE;
}
break;
default:
ret = HDCP_ERROR_INVALID_STATE;
UPDATE_LINK_STATE(lk_data, LINK_ST_H1_TX_LOW_VALUE_CONTENT);
break;
}
} while (1);
}
/* todo: support multi link & multi session */
int hdcp_dplink_authenticate(void)
{
int ret;
static int retry_cnt;
mutex_lock(&hdcp_auth_mutex);
auth_proc_state = HDCP_AUTH_PROCESS_IDLE;
for (; retry_cnt < HDCP_AUTH_RETRY_COUNT; retry_cnt++) {
if (!rp_ready) {
hdcp_clear_session(ss_info.ss_id);
if (hdcp_session_open(&ss_info)) {
mutex_unlock(&hdcp_auth_mutex);
return -ENOMEM;
}
lk_info.ss_id = ss_info.ss_id;
if (hdcp_link_open(&lk_info, HDCP_LINK_TYPE_DP)) {
hdcp_session_close(&ss_info);
mutex_unlock(&hdcp_auth_mutex);
return -ENOMEM;
}
/* if hdcp is enabled, disable it while hdcp authentication */
if (hdcp_dplink_is_enabled_hdcp22())
hdcp_dplink_config(DP_HDCP22_DISABLE);
dplink_clear_irqflag_all();
}
ret = do_dplink_auth(&lk_info);
if (ret == HDCP_SUCCESS) {
hdcp_info("Success HDCP authenticate done.\n");
retry_cnt = 0;
mutex_unlock(&hdcp_auth_mutex);
return 0;
} else {
/* auth_proc_state flag check */
if (auth_proc_state == HDCP_AUTH_PROCESS_STOP) {
hdcp_info("Stop authenticate.\n");
auth_proc_state = HDCP_AUTH_PROCESS_IDLE;
break;
}
/* retry */
dplink_clear_irqflag_all();
hdcp_err("HDCP auth failed. retry(%d)\n", retry_cnt);
}
}
retry_cnt = 0;
mutex_unlock(&hdcp_auth_mutex);
return -EACCES;
}
void hdcp_clear_session(uint32_t id)
{
struct hdcp_sess_info ss;
struct hdcp_link_info lk;
ss.ss_id = id;
lk.ss_id = id;
lk.lk_id = id;
hdcp_link_close(&lk);
hdcp_session_close(&ss);
}
int hdcp_dplink_stream_manage(void)
{
hdcp_info("stream manage updated.\n");
/* todo: update stream manage information */
return 0;
}
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