// SPDX-License-Identifier: GPL-2.0
/*
 * Intel BayTrail PMIC I2C bus semaphore implementation
 * Copyright (c) 2014, Intel Corporation.
 */
#include <linux/device.h>
#include <linux/acpi.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>

#include <asm/iosf_mbi.h>

#include "i2c-designware-core.h"

int i2c_dw_baytrail_probe_lock_support(struct dw_i2c_dev *dev)
{
        acpi_status status;
        unsigned long long shared_host = 0;
        acpi_handle handle;

        if (!dev)
                return -ENODEV;

        handle = ACPI_HANDLE(dev->dev);
        if (!handle)
                return -ENODEV;

        status = acpi_evaluate_integer(handle, "_SEM", NULL, &shared_host);
        if (ACPI_FAILURE(status))
                return -ENODEV;

        if (!shared_host)
                return -ENODEV;

        if (!iosf_mbi_available())
                return -EPROBE_DEFER;

        dev_info(dev->dev, "I2C bus managed by PUNIT\n");
        dev->acquire_lock = iosf_mbi_block_punit_i2c_access;
        dev->release_lock = iosf_mbi_unblock_punit_i2c_access;
        dev->shared_with_punit = true;

        return 0;
}