// SPDX-License-Identifier: GPL-2.0
/* Author: Dan Scally <djrscally@gmail.com> */

#include <linux/acpi.h>
#include <linux/platform_data/x86/int3472.h>
#include <linux/slab.h>

union acpi_object *skl_int3472_get_acpi_buffer(struct acpi_device *adev, char *id)
{
        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
        acpi_handle handle = adev->handle;
        union acpi_object *obj;
        acpi_status status;

        status = acpi_evaluate_object(handle, id, NULL, &buffer);
        if (ACPI_FAILURE(status))
                return ERR_PTR(-ENODEV);

        obj = buffer.pointer;
        if (!obj)
                return ERR_PTR(-ENODEV);

        if (obj->type != ACPI_TYPE_BUFFER) {
                acpi_handle_err(handle, "%s object is not an ACPI buffer\n", id);
                kfree(obj);
                return ERR_PTR(-EINVAL);
        }

        return obj;
}
EXPORT_SYMBOL_NS_GPL(skl_int3472_get_acpi_buffer, "INTEL_INT3472");

int skl_int3472_fill_cldb(struct acpi_device *adev, struct int3472_cldb *cldb)
{
        union acpi_object *obj;
        int ret;

        obj = skl_int3472_get_acpi_buffer(adev, "CLDB");
        if (IS_ERR(obj))
                return PTR_ERR(obj);

        if (obj->buffer.length > sizeof(*cldb)) {
                acpi_handle_err(adev->handle, "The CLDB buffer is too large\n");
                ret = -EINVAL;
                goto out_free_obj;
        }

        memcpy(cldb, obj->buffer.pointer, obj->buffer.length);
        ret = 0;

out_free_obj:
        kfree(obj);
        return ret;
}
EXPORT_SYMBOL_NS_GPL(skl_int3472_fill_cldb, "INTEL_INT3472");

/* sensor_adev_ret may be NULL, name_ret must not be NULL */
int skl_int3472_get_sensor_adev_and_name(struct device *dev,
                                         struct acpi_device **sensor_adev_ret,
                                         const char **name_ret)
{
        struct acpi_device *adev = ACPI_COMPANION(dev);
        struct acpi_device *sensor;
        int ret = 0;

        sensor = acpi_dev_get_next_consumer_dev(adev, NULL);
        if (!sensor) {
                dev_err(dev, "INT3472 seems to have no dependents.\n");
                return -ENODEV;
        }

        dev_dbg(dev, "Sensor name %s\n", acpi_dev_name(sensor));

        *name_ret = devm_kasprintf(dev, GFP_KERNEL, I2C_DEV_NAME_FORMAT,
                                   acpi_dev_name(sensor));
        if (!*name_ret)
                ret = -ENOMEM;

        if (ret == 0 && sensor_adev_ret)
                *sensor_adev_ret = sensor;
        else
                acpi_dev_put(sensor);

        return ret;
}
EXPORT_SYMBOL_NS_GPL(skl_int3472_get_sensor_adev_and_name, "INTEL_INT3472");

MODULE_DESCRIPTION("Intel SkyLake INT3472 ACPI Device Driver library");
MODULE_AUTHOR("Daniel Scally <djrscally@gmail.com>");
MODULE_LICENSE("GPL");