1// SPDX-License-Identifier: GPL-2.0
  2/* Author: Dan Scally <djrscally@gmail.com> */
  3
  4#include <linux/acpi.h>
  5#include <linux/i2c.h>
  6#include <linux/platform_device.h>
  7#include <linux/slab.h>
  8
  9#include "intel_skl_int3472_common.h"
 10
 11union acpi_object *skl_int3472_get_acpi_buffer(struct acpi_device *adev, char *id)
 12{
 13	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 14	acpi_handle handle = adev->handle;
 15	union acpi_object *obj;
 16	acpi_status status;
 17
 18	status = acpi_evaluate_object(handle, id, NULL, &buffer);
 19	if (ACPI_FAILURE(status))
 20		return ERR_PTR(-ENODEV);
 21
 22	obj = buffer.pointer;
 23	if (!obj)
 24		return ERR_PTR(-ENODEV);
 25
 26	if (obj->type != ACPI_TYPE_BUFFER) {
 27		acpi_handle_err(handle, "%s object is not an ACPI buffer\n", id);
 28		kfree(obj);
 29		return ERR_PTR(-EINVAL);
 30	}
 31
 32	return obj;
 33}
 34
 35int skl_int3472_fill_cldb(struct acpi_device *adev, struct int3472_cldb *cldb)
 36{
 37	union acpi_object *obj;
 38	int ret;
 39
 40	obj = skl_int3472_get_acpi_buffer(adev, "CLDB");
 41	if (IS_ERR(obj))
 42		return PTR_ERR(obj);
 43
 44	if (obj->buffer.length > sizeof(*cldb)) {
 45		acpi_handle_err(adev->handle, "The CLDB buffer is too large\n");
 46		ret = -EINVAL;
 47		goto out_free_obj;
 48	}
 49
 50	memcpy(cldb, obj->buffer.pointer, obj->buffer.length);
 51	ret = 0;
 52
 53out_free_obj:
 54	kfree(obj);
 55	return ret;
 56}
 57
 58static const struct acpi_device_id int3472_device_id[] = {
 59	{ "INT3472", 0 },
 60	{ }
 61};
 62MODULE_DEVICE_TABLE(acpi, int3472_device_id);
 63
 64static struct platform_driver int3472_discrete = {
 65	.driver = {
 66		.name = "int3472-discrete",
 67		.acpi_match_table = int3472_device_id,
 68	},
 69	.probe = skl_int3472_discrete_probe,
 70	.remove = skl_int3472_discrete_remove,
 71};
 72
 73static struct i2c_driver int3472_tps68470 = {
 74	.driver = {
 75		.name = "int3472-tps68470",
 76		.acpi_match_table = int3472_device_id,
 77	},
 78	.probe_new = skl_int3472_tps68470_probe,
 79};
 80
 81static int skl_int3472_init(void)
 82{
 83	int ret;
 84
 85	ret = platform_driver_register(&int3472_discrete);
 86	if (ret)
 87		return ret;
 88
 89	ret = i2c_register_driver(THIS_MODULE, &int3472_tps68470);
 90	if (ret)
 91		platform_driver_unregister(&int3472_discrete);
 92
 93	return ret;
 94}
 95module_init(skl_int3472_init);
 96
 97static void skl_int3472_exit(void)
 98{
 99	platform_driver_unregister(&int3472_discrete);
100	i2c_del_driver(&int3472_tps68470);
101}
102module_exit(skl_int3472_exit);
103
104MODULE_DESCRIPTION("Intel SkyLake INT3472 ACPI Device Driver");
105MODULE_AUTHOR("Daniel Scally <djrscally@gmail.com>");
106MODULE_LICENSE("GPL v2");