xref: /linux/drivers/platform/x86/intel/int3472/common.c (revision 1193e205dbb6feca917dc8e1862ffcdf2194234b)
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