// 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>
#ifdef CONFIG_GMIN_INTEL_MID
#include <asm/intel_mid_pcihelpers.h>
#endif
#include "i2c-designware-core.h"

#ifdef CONFIG_GMIN_INTEL_MID
static int dw_i2c_acquire_ownership(void)
{       
	return intel_mid_dw_i2c_acquire_ownership();
}
       
static void dw_i2c_release_ownership(struct dw_i2c_dev *dev)
{       
	intel_mid_dw_i2c_release_ownership();
}       
#endif

int i2c_dw_probe_lock_support(struct dw_i2c_dev *dev)
{
	acpi_status status;
	unsigned long long shared_host = 0;
	acpi_handle handle;

	if (!dev || !dev->dev)
		return 0;

	handle = ACPI_HANDLE(dev->dev);
	if (!handle)
		return 0;

	status = acpi_evaluate_integer(handle, "_SEM", NULL, &shared_host);
	if (ACPI_FAILURE(status))
		return 0;

	if (!shared_host)
		return 0;

#ifndef CONFIG_GMIN_INTEL_MID
	if (!iosf_mbi_available())
		return -EPROBE_DEFER;
#endif

	dev_info(dev->dev, "I2C bus managed by PUNIT\n");
#ifdef CONFIG_GMIN_INTEL_MID
	dev->acquire_lock = dw_i2c_acquire_ownership;
	dev->release_lock = dw_i2c_release_ownership;
#else
	dev->acquire_lock = iosf_mbi_block_punit_i2c_access;
	dev->release_lock = iosf_mbi_unblock_punit_i2c_access;
#endif
	dev->shared_with_punit = true;

	return 0;
}