// SPDX-License-Identifier: GPL-2.0+
/* Copyright (C) 2022 AVM GmbH <fritzbox_info@avm.de> */

#define pr_fmt(fmt) "mrpc/avm_crashlog_client: " fmt

#include "avm_crashlog_mrpc.h"
#include <linux/types.h>
#include <linux/env.h>
#include <linux/mrpc.h>
#include <asm/byteorder.h>
#include <avm/tffs/tffs.h>

#define AVM_CRASHLOG_MRPC_TIMEOUT 60000

static struct mrpc_client *client;

static int __init crashlog_client_init(void)
{
	client = mrpc_client_register(
		MRPC_RESERVED_ID_AVM_CRASHLOG,
		"AVM crashlog client");

	if (!client)
		return -ENODEV;

	return 0;
}
static_notifier_module_init(mrpc_ready, crashlog_client_init);

#ifdef CONFIG_TFFS_REMOTE_CRASHLOG_READER
int avm_remote_crashlog_sem_down(void)
{
	int ret, errcode;

	if (!client)
		return -ENODEV;

	ret = mrpc_call(client, MRPC_AVM_CRASHLOG_PROC_SEM_DOWN,
			NULL, 0, NULL, 0,
			AVM_CRASHLOG_MRPC_TIMEOUT, &errcode);

	if (ret)
		pr_err("[%s]: MRPC call failed with code=%d\n", __func__, ret);

	if (ret > 0)
		return -EIO;
	else
		return ret;
}

int avm_remote_crashlog_sem_up(void)
{
	int ret, errcode;

	if (!client)
		return -ENODEV;

	ret = mrpc_call(client, MRPC_AVM_CRASHLOG_PROC_SEM_UP,
			NULL, 0, NULL, 0,
			AVM_CRASHLOG_MRPC_TIMEOUT, &errcode);

	if (ret)
		pr_err("[%s]: MRPC call failed with code=%d\n", __func__, ret);

	if (ret > 0)
		return -EIO;
	else
		return ret;
}
#endif /* CONFIG_TFFS_REMOTE_CRASHLOG_READER */


#ifdef CONFIG_TFFS_REMOTE_CRASHLOG_WRITER
int avm_remote_crashlog_is_read_forbidden(void)
{
	int ret, errcode, reply;

	if (!client)
		return 0;

	ret = mrpc_call(client, MRPC_AVM_CRASHLOG_PROC_IS_READ_FORBIDDEN,
			NULL, 0, &reply, sizeof(reply),
			AVM_CRASHLOG_MRPC_TIMEOUT, &errcode);

	if (ret) {
		pr_err("[%s]: MRPC call failed with code=%d\n", __func__, ret);

		/* Don't lock on MRPC call failure */
		return 0;
	}

	return be32_to_cpu(reply);
}
#endif /* CONFIG_TFFS_REMOTE_CRASHLOG_WRITER */