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path: root/drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c
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Diffstat (limited to 'drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c')
-rw-r--r--drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c179
1 files changed, 179 insertions, 0 deletions
diff --git a/drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c b/drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c
new file mode 100644
index 000000000000..75aedbb733be
--- /dev/null
+++ b/drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c
@@ -0,0 +1,179 @@
+// 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->package.elements[CURRENT_VAL].type != ACPI_TYPE_INTEGER) {
+ kfree(obj);
+ return -EINVAL;
+ }
+ 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 = kcalloc(wmi_priv.integer_instances_count,
+ sizeof(struct integer_data), GFP_KERNEL);
+ 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;
+ strlcpy_attr(wmi_priv.integer_data[instance_id].attribute_name,
+ integer_obj[ATTR_NAME].string.pointer);
+ strlcpy_attr(wmi_priv.integer_data[instance_id].display_name_language_code,
+ integer_obj[DISPL_NAME_LANG_CODE].string.pointer);
+ strlcpy_attr(wmi_priv.integer_data[instance_id].display_name,
+ integer_obj[DISPLAY_NAME].string.pointer);
+ wmi_priv.integer_data[instance_id].default_value =
+ (uintptr_t)integer_obj[DEFAULT_VAL].string.pointer;
+ strlcpy_attr(wmi_priv.integer_data[instance_id].dell_modifier,
+ integer_obj[MODIFIER].string.pointer);
+ wmi_priv.integer_data[instance_id].min_value =
+ (uintptr_t)integer_obj[MIN_VALUE].string.pointer;
+ wmi_priv.integer_data[instance_id].max_value =
+ (uintptr_t)integer_obj[MAX_VALUE].string.pointer;
+ 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);
+ }
+ kfree(wmi_priv.integer_data);
+}