55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Author: Dan Scally <djrscally@gmail.com> */
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#include <linux/acpi.h>
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#include <linux/slab.h>
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#include "common.h"
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union acpi_object *skl_int3472_get_acpi_buffer(struct acpi_device *adev, char *id)
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{
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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acpi_handle handle = adev->handle;
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union acpi_object *obj;
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acpi_status status;
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status = acpi_evaluate_object(handle, id, NULL, &buffer);
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if (ACPI_FAILURE(status))
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return ERR_PTR(-ENODEV);
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obj = buffer.pointer;
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if (!obj)
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return ERR_PTR(-ENODEV);
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if (obj->type != ACPI_TYPE_BUFFER) {
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acpi_handle_err(handle, "%s object is not an ACPI buffer\n", id);
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kfree(obj);
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return ERR_PTR(-EINVAL);
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}
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return obj;
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}
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int skl_int3472_fill_cldb(struct acpi_device *adev, struct int3472_cldb *cldb)
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{
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union acpi_object *obj;
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int ret;
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obj = skl_int3472_get_acpi_buffer(adev, "CLDB");
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if (IS_ERR(obj))
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return PTR_ERR(obj);
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if (obj->buffer.length > sizeof(*cldb)) {
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acpi_handle_err(adev->handle, "The CLDB buffer is too large\n");
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ret = -EINVAL;
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goto out_free_obj;
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}
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memcpy(cldb, obj->buffer.pointer, obj->buffer.length);
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ret = 0;
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out_free_obj:
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kfree(obj);
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return ret;
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}
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