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1// SPDX-License-Identifier: GPL-2.02/* 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 else81 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");90