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
 9union 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
33int 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
51out_free_obj:
52	kfree(obj);
53	return ret;
54}
55
56/* sensor_adev_ret may be NULL, name_ret must not be NULL */
57int skl_int3472_get_sensor_adev_and_name(struct device *dev,
58					 struct acpi_device **sensor_adev_ret,
59					 const char **name_ret)
60{
61	struct acpi_device *adev = ACPI_COMPANION(dev);
62	struct acpi_device *sensor;
63	int ret = 0;
64
65	sensor = acpi_dev_get_next_consumer_dev(adev, NULL);
66	if (!sensor) {
67		dev_err(dev, "INT3472 seems to have no dependents.\n");
68		return -ENODEV;
69	}
70
71	*name_ret = devm_kasprintf(dev, GFP_KERNEL, I2C_DEV_NAME_FORMAT,
72				   acpi_dev_name(sensor));
73	if (!*name_ret)
74		ret = -ENOMEM;
75
76	if (ret == 0 && sensor_adev_ret)
77		*sensor_adev_ret = sensor;
78	else
79		acpi_dev_put(sensor);
80
81	return ret;
82}