// SPDX-License-Identifier: GPL-2.0
/*
 * Functions corresponding to integer type attributes under BIOS Integer GUID for use with
 * dell-wmi-sysman
 *
 *  Copyright (c) 2020 Dell Inc.
 */

#include "dell-wmi-sysman.h"

enum int_properties {MIN_VALUE = 6, MAX_VALUE, SCALAR_INCR};

get_instance_id(integer);

static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
        int instance_id = get_integer_instance_id(kobj);
        union acpi_object *obj;
        ssize_t ret;

        if (instance_id < 0)
                return instance_id;

        /* need to use specific instance_id and guid combination to get right data */
        obj = get_wmiobj_pointer(instance_id, DELL_WMI_BIOS_INTEGER_ATTRIBUTE_GUID);
        if (!obj)
                return -EIO;
        if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count < INT_MIN_ELEMENTS ||
            obj->package.elements[CURRENT_VAL].type != ACPI_TYPE_INTEGER) {
                kfree(obj);
                return -EIO;
        }
        ret = snprintf(buf, PAGE_SIZE, "%lld\n", obj->package.elements[CURRENT_VAL].integer.value);
        kfree(obj);
        return ret;
}

/**
 * validate_integer_input() - Validate input of current_value against lower and upper bound
 * @instance_id: The instance on which input is validated
 * @buf: Input value
 */
static int validate_integer_input(int instance_id, char *buf)
{
        int in_val;
        int ret;

        ret = kstrtoint(buf, 0, &in_val);
        if (ret)
                return ret;
        if (in_val < wmi_priv.integer_data[instance_id].min_value ||
                        in_val > wmi_priv.integer_data[instance_id].max_value)
                return -EINVAL;

        /* workaround for BIOS error.
         * validate input to avoid setting 0 when integer input passed with + sign
         */
        if (*buf == '+')
                memmove(buf, (buf + 1), strlen(buf + 1) + 1);

        return ret;
}

attribute_s_property_show(display_name_language_code, integer);
static struct kobj_attribute integer_displ_langcode =
        __ATTR_RO(display_name_language_code);

attribute_s_property_show(display_name, integer);
static struct kobj_attribute integer_displ_name =
        __ATTR_RO(display_name);

attribute_n_property_show(default_value, integer);
static struct kobj_attribute integer_default_val =
        __ATTR_RO(default_value);

attribute_property_store(current_value, integer);
static struct kobj_attribute integer_current_val =
        __ATTR_RW_MODE(current_value, 0600);

attribute_s_property_show(dell_modifier, integer);
static struct kobj_attribute integer_modifier =
        __ATTR_RO(dell_modifier);

attribute_n_property_show(min_value, integer);
static struct kobj_attribute integer_lower_bound =
        __ATTR_RO(min_value);

attribute_n_property_show(max_value, integer);
static struct kobj_attribute integer_upper_bound =
        __ATTR_RO(max_value);

attribute_n_property_show(scalar_increment, integer);
static struct kobj_attribute integer_scalar_increment =
        __ATTR_RO(scalar_increment);

static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr,
                         char *buf)
{
        return sprintf(buf, "integer\n");
}
static struct kobj_attribute integer_type =
        __ATTR_RO(type);

static struct attribute *integer_attrs[] = {
        &integer_displ_langcode.attr,
        &integer_displ_name.attr,
        &integer_default_val.attr,
        &integer_current_val.attr,
        &integer_modifier.attr,
        &integer_lower_bound.attr,
        &integer_upper_bound.attr,
        &integer_scalar_increment.attr,
        &integer_type.attr,
        NULL,
};

static const struct attribute_group integer_attr_group = {
        .attrs = integer_attrs,
};

int alloc_int_data(void)
{
        int ret = 0;

        wmi_priv.integer_instances_count = get_instance_count(DELL_WMI_BIOS_INTEGER_ATTRIBUTE_GUID);
        wmi_priv.integer_data = kzalloc_objs(struct integer_data,
                                             wmi_priv.integer_instances_count);
        if (!wmi_priv.integer_data) {
                wmi_priv.integer_instances_count = 0;
                ret = -ENOMEM;
        }
        return ret;
}

/**
 * populate_int_data() - Populate all properties of an instance under integer attribute
 * @integer_obj: ACPI object with integer data
 * @instance_id: The instance to enumerate
 * @attr_name_kobj: The parent kernel object
 */
int populate_int_data(union acpi_object *integer_obj, int instance_id,
                        struct kobject *attr_name_kobj)
{
        wmi_priv.integer_data[instance_id].attr_name_kobj = attr_name_kobj;
        if (check_property_type(integer, ATTR_NAME, ACPI_TYPE_STRING))
                return -EINVAL;
        strlcpy_attr(wmi_priv.integer_data[instance_id].attribute_name,
                integer_obj[ATTR_NAME].string.pointer);
        if (check_property_type(integer, DISPL_NAME_LANG_CODE, ACPI_TYPE_STRING))
                return -EINVAL;
        strlcpy_attr(wmi_priv.integer_data[instance_id].display_name_language_code,
                integer_obj[DISPL_NAME_LANG_CODE].string.pointer);
        if (check_property_type(integer, DISPLAY_NAME, ACPI_TYPE_STRING))
                return -EINVAL;
        strlcpy_attr(wmi_priv.integer_data[instance_id].display_name,
                integer_obj[DISPLAY_NAME].string.pointer);
        if (check_property_type(integer, DEFAULT_VAL, ACPI_TYPE_INTEGER))
                return -EINVAL;
        wmi_priv.integer_data[instance_id].default_value =
                (uintptr_t)integer_obj[DEFAULT_VAL].string.pointer;
        if (check_property_type(integer, MODIFIER, ACPI_TYPE_STRING))
                return -EINVAL;
        strlcpy_attr(wmi_priv.integer_data[instance_id].dell_modifier,
                integer_obj[MODIFIER].string.pointer);
        if (check_property_type(integer, MIN_VALUE, ACPI_TYPE_INTEGER))
                return -EINVAL;
        wmi_priv.integer_data[instance_id].min_value =
                (uintptr_t)integer_obj[MIN_VALUE].string.pointer;
        if (check_property_type(integer, MAX_VALUE, ACPI_TYPE_INTEGER))
                return -EINVAL;
        wmi_priv.integer_data[instance_id].max_value =
                (uintptr_t)integer_obj[MAX_VALUE].string.pointer;
        if (check_property_type(integer, SCALAR_INCR, ACPI_TYPE_INTEGER))
                return -EINVAL;
        wmi_priv.integer_data[instance_id].scalar_increment =
                (uintptr_t)integer_obj[SCALAR_INCR].string.pointer;

        return sysfs_create_group(attr_name_kobj, &integer_attr_group);
}

/**
 * exit_int_attributes() - Clear all attribute data
 *
 * Clears all data allocated for this group of attributes
 */
void exit_int_attributes(void)
{
        int instance_id;

        for (instance_id = 0; instance_id < wmi_priv.integer_instances_count; instance_id++) {
                if (wmi_priv.integer_data[instance_id].attr_name_kobj)
                        sysfs_remove_group(wmi_priv.integer_data[instance_id].attr_name_kobj,
                                                                &integer_attr_group);
        }
        wmi_priv.integer_instances_count = 0;

        kfree(wmi_priv.integer_data);
        wmi_priv.integer_data = NULL;
}