1 // SPDX-License-Identifier: GPL-2.0
2 /* Author: Dan Scally <djrscally@gmail.com> */
3
4 #include <linux/acpi.h>
5 #include <linux/platform_data/x86/int3472.h>
6 #include <linux/slab.h>
7
skl_int3472_get_acpi_buffer(struct acpi_device * adev,char * id)8 union acpi_object *skl_int3472_get_acpi_buffer(struct acpi_device *adev, char *id)
9 {
10 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
11 acpi_handle handle = adev->handle;
12 union acpi_object *obj;
13 acpi_status status;
14
15 status = acpi_evaluate_object(handle, id, NULL, &buffer);
16 if (ACPI_FAILURE(status))
17 return ERR_PTR(-ENODEV);
18
19 obj = buffer.pointer;
20 if (!obj)
21 return ERR_PTR(-ENODEV);
22
23 if (obj->type != ACPI_TYPE_BUFFER) {
24 acpi_handle_err(handle, "%s object is not an ACPI buffer\n", id);
25 kfree(obj);
26 return ERR_PTR(-EINVAL);
27 }
28
29 return obj;
30 }
31 EXPORT_SYMBOL_NS_GPL(skl_int3472_get_acpi_buffer, "INTEL_INT3472");
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 EXPORT_SYMBOL_NS_GPL(skl_int3472_fill_cldb, "INTEL_INT3472");
56
57 /* sensor_adev_ret may be NULL, name_ret must not be NULL */
skl_int3472_get_sensor_adev_and_name(struct device * dev,struct acpi_device ** sensor_adev_ret,const char ** name_ret)58 int skl_int3472_get_sensor_adev_and_name(struct device *dev,
59 struct acpi_device **sensor_adev_ret,
60 const char **name_ret)
61 {
62 struct acpi_device *adev = ACPI_COMPANION(dev);
63 struct acpi_device *sensor;
64 int ret = 0;
65
66 sensor = acpi_dev_get_next_consumer_dev(adev, NULL);
67 if (!sensor) {
68 dev_err(dev, "INT3472 seems to have no dependents.\n");
69 return -ENODEV;
70 }
71
72 dev_dbg(dev, "Sensor name %s\n", acpi_dev_name(sensor));
73
74 *name_ret = devm_kasprintf(dev, GFP_KERNEL, I2C_DEV_NAME_FORMAT,
75 acpi_dev_name(sensor));
76 if (!*name_ret)
77 ret = -ENOMEM;
78
79 if (ret == 0 && sensor_adev_ret)
80 *sensor_adev_ret = sensor;
81 else
82 acpi_dev_put(sensor);
83
84 return ret;
85 }
86 EXPORT_SYMBOL_NS_GPL(skl_int3472_get_sensor_adev_and_name, "INTEL_INT3472");
87
88 MODULE_DESCRIPTION("Intel SkyLake INT3472 ACPI Device Driver library");
89 MODULE_AUTHOR("Daniel Scally <djrscally@gmail.com>");
90 MODULE_LICENSE("GPL");
91