linux-imx

/*

 * ACPI configfs support

 *

 * Copyright (c) 2016 Intel Corporation

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published by

 * the Free Software Foundation.

 */

​

#define pr_fmt(fmt) "ACPI configfs: " fmt

​

#include <linux/init.h>

#include <linux/module.h>

#include <linux/configfs.h>

#include <linux/acpi.h>

​

#include "acpica/accommon.h"

#include "acpica/actables.h"

​

static struct config_group *acpi_table_group;

​

struct acpi_table {

    struct config_item cfg;

    struct acpi_table_header *header;

    u32 index;

};

​

static ssize_t acpi_table_aml_write(struct config_item *cfg,

                    const void *data, size_t size)

{

    const struct acpi_table_header *header = data;

    struct acpi_table *table;

    int ret;

​

    table = container_of(cfg, struct acpi_table, cfg);

​

    if (table->header) {

        pr_err("table already loaded\n");

        return -EBUSY;

    }

​

    if (header->length != size) {

        pr_err("invalid table length\n");

        return -EINVAL;

    }

​

    if (memcmp(header->signature, ACPI_SIG_SSDT, 4)) {

        pr_err("invalid table signature\n");

        return -EINVAL;

    }

​

    table = container_of(cfg, struct acpi_table, cfg);

​

    table->header = kmemdup(header, header->length, GFP_KERNEL);

    if (!table->header)

        return -ENOMEM;

​

    ACPI_INFO(("Host-directed Dynamic ACPI Table Load:"));

    ret = acpi_tb_install_and_load_table(

            ACPI_PTR_TO_PHYSADDR(table->header),

            ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL, FALSE,

            &table->index);