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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2022 Samsung Electronics Co., Ltd.
*
* Samsung DisplayPort driver.
*
* 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/delay.h>
#include <linux/errno.h>
#include <linux/module.h>
#include "exynos-hdcp-interface.h"
#include "auth-control.h"
#include "auth13.h"
#include "auth22.h"
#include "hdcp-log.h"
#include "teeif.h"
#define HDCP_SCHEDULE_DELAY_MSEC (5000)
static struct delayed_work hdcp_work;
static enum auth_state state;
static unsigned long max_ver = 2;
module_param(max_ver, ulong, 0664);
MODULE_PARM_DESC(max_ver,
"support up to specific hdcp version by setting max_ver=x");
int hdcp_get_auth_state(void) {
return state;
}
static int run_hdcp2_auth(void) {
int ret;
int i;
state = HDCP2_AUTH_PROGRESS;
for (i = 0; i < 5; ++i) {
ret = hdcp22_dplink_authenticate();
if (ret == 0) {
state = HDCP2_AUTH_DONE;
/* HDCP2.2 spec defined 200ms */
msleep(200);
hdcp_tee_enable_enc_22();
return 0;
} else if (ret != -EAGAIN) {
return -EIO;
}
hdcp_info("HDCP22 Retry...\n");
}
return -EIO;
}
static void hdcp_worker(struct work_struct *work) {
if (max_ver >= 2) {
hdcp_info("Trying HDCP22...\n");
if (run_hdcp2_auth() == 0) {
hdcp_info("HDCP22 Authentication Success\n");
return;
}
hdcp_info("HDCP22 Authentication Failed.\n");
} else {
hdcp_info("Not trying HDCP22. max_ver is %lu\n", max_ver);
}
if (max_ver >= 1) {
hdcp_info("Trying HDCP13...\n");
state = HDCP1_AUTH_PROGRESS;
if (hdcp13_dplink_authenticate() == 0) {
hdcp_info("HDCP13 Authentication Success\n");
state = HDCP1_AUTH_DONE;
return;
}
state = HDCP_AUTH_IDLE;
hdcp_info("HDCP13 Authentication Failed.\n");
} else {
hdcp_info("Not trying HDCP13. max_ver is %lu\n", max_ver);
}
}
void hdcp_dplink_handle_irq(void) {
if (state == HDCP2_AUTH_PROGRESS || state == HDCP2_AUTH_DONE) {
if (hdcp22_dplink_handle_irq() == -EAGAIN)
schedule_delayed_work(&hdcp_work, 0);
return;
}
if (state == HDCP1_AUTH_DONE) {
if (hdcp13_dplink_handle_irq() == -EAGAIN)
schedule_delayed_work(&hdcp_work, 0);
return;
}
}
EXPORT_SYMBOL_GPL(hdcp_dplink_handle_irq);
void hdcp_dplink_connect_state(enum dp_state dp_hdcp_state) {
hdcp_info("Displayport connect info (%d)\n", dp_hdcp_state);
hdcp_tee_connect_info((int)dp_hdcp_state);
if (dp_hdcp_state == DP_DISCONNECT) {
hdcp13_dplink_abort();
hdcp22_dplink_abort();
hdcp_tee_disable_enc();
state = HDCP_AUTH_IDLE;
if (delayed_work_pending(&hdcp_work))
cancel_delayed_work(&hdcp_work);
return;
}
schedule_delayed_work(&hdcp_work, msecs_to_jiffies(HDCP_SCHEDULE_DELAY_MSEC));
return;
}
EXPORT_SYMBOL_GPL(hdcp_dplink_connect_state);
void hdcp_auth_worker_init(void) {
INIT_DELAYED_WORK(&hdcp_work, hdcp_worker);
}
void hdcp_auth_worker_deinit(void) {
cancel_delayed_work_sync(&hdcp_work);
}
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