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}
32EXPORT_SYMBOL_GPL(skl_int3472_get_acpi_buffer);
33
34int skl_int3472_fill_cldb(struct acpi_device *adev, struct int3472_cldb *cldb)
35{
36	union acpi_object *obj;
37	int ret;
38
39	obj = skl_int3472_get_acpi_buffer(adev, "CLDB");
40	if (IS_ERR(obj))
41		return PTR_ERR(obj);
42
43	if (obj->buffer.length > sizeof(*cldb)) {
44		acpi_handle_err(adev->handle, "The CLDB buffer is too large\n");
45		ret = -EINVAL;
46		goto out_free_obj;
47	}
48
49	memcpy(cldb, obj->buffer.pointer, obj->buffer.length);
50	ret = 0;
51
52out_free_obj:
53	kfree(obj);
54	return ret;
55}
56EXPORT_SYMBOL_GPL(skl_int3472_fill_cldb);
57
58/* sensor_adev_ret may be NULL, name_ret must not be NULL */
59int skl_int3472_get_sensor_adev_and_name(struct device *dev,
60					 struct acpi_device **sensor_adev_ret,
61					 const char **name_ret)
62{
63	struct acpi_device *adev = ACPI_COMPANION(dev);
64	struct acpi_device *sensor;
65	int ret = 0;
66
67	sensor = acpi_dev_get_next_consumer_dev(adev, NULL);
68	if (!sensor) {
69		dev_err(dev, "INT3472 seems to have no dependents.\n");
70		return -ENODEV;
71	}
72
73	*name_ret = devm_kasprintf(dev, GFP_KERNEL, I2C_DEV_NAME_FORMAT,
74				   acpi_dev_name(sensor));
75	if (!*name_ret)
76		ret = -ENOMEM;
77
78	if (ret == 0 && sensor_adev_ret)
79		*sensor_adev_ret = sensor;
80	else
81		acpi_dev_put(sensor);
82
83	return ret;
84}
85EXPORT_SYMBOL_GPL(skl_int3472_get_sensor_adev_and_name);
86
87MODULE_DESCRIPTION("Intel SkyLake INT3472 ACPI Device Driver library");
88MODULE_AUTHOR("Daniel Scally <djrscally@gmail.com>");
89MODULE_LICENSE("GPL");