linux-imx

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0

/******************************************************************************

 *

 * Module Name: exserial - field_unit support for serial address spaces

 *

 * Copyright (C) 2000 - 2019, Intel Corp.

 *

 *****************************************************************************/

​

#include <acpi/acpi.h>

#include "accommon.h"

#include "acdispat.h"

#include "acinterp.h"

#include "amlcode.h"

​

#define _COMPONENT          ACPI_EXECUTER

ACPI_MODULE_NAME("exserial")

​

/*******************************************************************************

 *

 * FUNCTION:    acpi_ex_read_gpio

 *

 * PARAMETERS:  obj_desc            - The named field to read

 *              buffer              - Where the return data is returned

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Read from a named field that references a Generic Serial Bus

 *              field

 *

 ******************************************************************************/

acpi_status acpi_ex_read_gpio(union acpi_operand_object *obj_desc, void *buffer)

{

    acpi_status status;

​

    ACPI_FUNCTION_TRACE_PTR(ex_read_gpio, obj_desc);

​

    /*

     * For GPIO (general_purpose_io), the Address will be the bit offset

     * from the previous Connection() operator, making it effectively a

     * pin number index. The bit_length is the length of the field, which

     * is thus the number of pins.

     */

    ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,

              "GPIO FieldRead [FROM]:  Pin %u Bits %u\n",

              obj_desc->field.pin_number_index,

              obj_desc->field.bit_length));

​

    /* Lock entire transaction if requested */

​

    acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);

​

    /* Perform the read */

​

    status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, ACPI_READ);

​

    acpi_ex_release_global_lock(obj_desc->common_field.field_flags);

    return_ACPI_STATUS(status);

}

​

/*******************************************************************************

 *

 * FUNCTION:    acpi_ex_write_gpio

 *

 * PARAMETERS:  source_desc         - Contains data to write. Expect to be

 *                                    an Integer object.

 *              obj_desc            - The named field

 *              result_desc         - Where the return value is returned, if any

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Write to a named field that references a General Purpose I/O

 *              field.

 *

 ******************************************************************************/

​

acpi_status

acpi_ex_write_gpio(union acpi_operand_object *source_desc,

           union acpi_operand_object *obj_desc,

           union acpi_operand_object **return_buffer)

{

    acpi_status status;

    void *buffer;

​

    ACPI_FUNCTION_TRACE_PTR(ex_write_gpio, obj_desc);

​

    /*

     * For GPIO (general_purpose_io), we will bypass the entire field

     * mechanism and handoff the bit address and bit width directly to

     * the handler. The Address will be the bit offset

     * from the previous Connection() operator, making it effectively a

     * pin number index. The bit_length is the length of the field, which