Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * ACPI support for CMOS RTC Address Space access
 *
 * Copyright (C) 2013, Intel Corporation
 * Authors: Lan Tianyu <tianyu.lan@intel.com>
 */
 
#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mc146818rtc.h>
 
#include "internal.h"
 
static const struct acpi_device_id acpi_cmos_rtc_ids[] = {
<------>{ "PNP0B00" },
<------>{ "PNP0B01" },
<------>{ "PNP0B02" },
<------>{}
};
 
static acpi_status
acpi_cmos_rtc_space_handler(u32 function, acpi_physical_address address,
<------><------>      u32 bits, u64 *value64,
<------><------>      void *handler_context, void *region_context)
{
<------>int i;
<------>u8 *value = (u8 *)value64;
 
<------>if (address > 0xff || !value64)
<------><------>return AE_BAD_PARAMETER;
 
<------>if (function != ACPI_WRITE && function != ACPI_READ)
<------><------>return AE_BAD_PARAMETER;
 
<------>spin_lock_irq(&rtc_lock);
 
<------>for (i = 0; i < DIV_ROUND_UP(bits, 8); ++i, ++address, ++value)
<------><------>if (function == ACPI_READ)
<------><------><------>*value = CMOS_READ(address);
<------><------>else
<------><------><------>CMOS_WRITE(*value, address);
 
<------>spin_unlock_irq(&rtc_lock);
 
<------>return AE_OK;
}
 
static int acpi_install_cmos_rtc_space_handler(struct acpi_device *adev,
<------><------>const struct acpi_device_id *id)
{
<------>acpi_status status;
 
<------>status = acpi_install_address_space_handler(adev->handle,
<------><------><------>ACPI_ADR_SPACE_CMOS,
<------><------><------>&acpi_cmos_rtc_space_handler,
<------><------><------>NULL, NULL);
<------>if (ACPI_FAILURE(status)) {
<------><------>pr_err(PREFIX "Error installing CMOS-RTC region handler\n");
<------><------>return -ENODEV;
<------>}
 
<------>return 1;
}
 
static void acpi_remove_cmos_rtc_space_handler(struct acpi_device *adev)
{
<------>if (ACPI_FAILURE(acpi_remove_address_space_handler(adev->handle,
<------><------><------>ACPI_ADR_SPACE_CMOS, &acpi_cmos_rtc_space_handler)))
<------><------>pr_err(PREFIX "Error removing CMOS-RTC region handler\n");
}
 
static struct acpi_scan_handler cmos_rtc_handler = {
<------>.ids = acpi_cmos_rtc_ids,
<------>.attach = acpi_install_cmos_rtc_space_handler,
<------>.detach = acpi_remove_cmos_rtc_space_handler,
};
 
void __init acpi_cmos_rtc_init(void)
{
<------>acpi_scan_add_handler(&cmos_rtc_handler);
}