1 // SPDX-License-Identifier: GPL-2.0
2 /* Author: Dan Scally <djrscally@gmail.com> */
3
4 #include <linux/acpi.h>
5 #include <linux/slab.h>
6
7 #include "common.h"
8
skl_int3472_get_acpi_buffer(struct acpi_device * adev,char * id)9 union acpi_object *skl_int3472_get_acpi_buffer(struct acpi_device *adev, char *id)
10 {
11 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
12 acpi_handle handle = adev->handle;
13 union acpi_object *obj;
14 acpi_status status;
15
16 status = acpi_evaluate_object(handle, id, NULL, &buffer);
17 if (ACPI_FAILURE(status))
18 return ERR_PTR(-ENODEV);
19
20 obj = buffer.pointer;
21 if (!obj)
22 return ERR_PTR(-ENODEV);
23
24 if (obj->type != ACPI_TYPE_BUFFER) {
25 acpi_handle_err(handle, "%s object is not an ACPI buffer\n", id);
26 kfree(obj);
27 return ERR_PTR(-EINVAL);
28 }
29
30 return obj;
31 }
32
skl_int3472_fill_cldb(struct acpi_device * adev,struct int3472_cldb * cldb)33 int skl_int3472_fill_cldb(struct acpi_device *adev, struct int3472_cldb *cldb)
34 {
35 union acpi_object *obj;
36 int ret;
37
38 obj = skl_int3472_get_acpi_buffer(adev, "CLDB");
39 if (IS_ERR(obj))
40 return PTR_ERR(obj);
41
42 if (obj->buffer.length > sizeof(*cldb)) {
43 acpi_handle_err(adev->handle, "The CLDB buffer is too large\n");
44 ret = -EINVAL;
45 goto out_free_obj;
46 }
47
48 memcpy(cldb, obj->buffer.pointer, obj->buffer.length);
49 ret = 0;
50
51 out_free_obj:
52 kfree(obj);
53 return ret;
54 }
55