drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c

Source file repositories/reference/linux-study-clean/drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c

File Facts

System
Linux kernel
Corpus path
drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c
Extension
.c
Size
6236 bytes
Lines
200
Domain
Driver Families
Bucket
drivers/platform
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// 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);

Annotation

Implementation Notes