// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2020 Loongson Technology Co., Ltd. */ #include #include #include #include #include #include #include static int nr_packages; static struct device *cpu_hwmon_dev; static int loongson3_cpu_temp(int cpu) { u32 reg; reg = iocsr_read32(LOONGARCH_IOCSR_CPUTEMP) & 0xff; return (int)((s8)reg) * 1000; } static ssize_t cpu_temp_label(struct device *dev, struct device_attribute *attr, char *buf) { int id = (to_sensor_dev_attr(attr))->index - 1; return sprintf(buf, "CPU %d Temperature\n", id); } static ssize_t get_cpu_temp(struct device *dev, struct device_attribute *attr, char *buf) { int id = (to_sensor_dev_attr(attr))->index - 1; int value = loongson3_cpu_temp(id); return sprintf(buf, "%d\n", value); } static SENSOR_DEVICE_ATTR(temp1_input, 0444, get_cpu_temp, NULL, 1); static SENSOR_DEVICE_ATTR(temp1_label, 0444, cpu_temp_label, NULL, 1); static SENSOR_DEVICE_ATTR(temp2_input, 0444, get_cpu_temp, NULL, 2); static SENSOR_DEVICE_ATTR(temp2_label, 0444, cpu_temp_label, NULL, 2); static SENSOR_DEVICE_ATTR(temp3_input, 0444, get_cpu_temp, NULL, 3); static SENSOR_DEVICE_ATTR(temp3_label, 0444, cpu_temp_label, NULL, 3); static SENSOR_DEVICE_ATTR(temp4_input, 0444, get_cpu_temp, NULL, 4); static SENSOR_DEVICE_ATTR(temp4_label, 0444, cpu_temp_label, NULL, 4); static SENSOR_DEVICE_ATTR(temp5_input, 0444, get_cpu_temp, NULL, 4); static SENSOR_DEVICE_ATTR(temp5_label, 0444, cpu_temp_label, NULL, 4); static SENSOR_DEVICE_ATTR(temp6_input, 0444, get_cpu_temp, NULL, 4); static SENSOR_DEVICE_ATTR(temp6_label, 0444, cpu_temp_label, NULL, 4); static SENSOR_DEVICE_ATTR(temp7_input, 0444, get_cpu_temp, NULL, 4); static SENSOR_DEVICE_ATTR(temp7_label, 0444, cpu_temp_label, NULL, 4); static SENSOR_DEVICE_ATTR(temp8_input, 0444, get_cpu_temp, NULL, 4); static SENSOR_DEVICE_ATTR(temp8_label, 0444, cpu_temp_label, NULL, 4); static SENSOR_DEVICE_ATTR(temp9_input, 0444, get_cpu_temp, NULL, 4); static SENSOR_DEVICE_ATTR(temp9_label, 0444, cpu_temp_label, NULL, 4); static SENSOR_DEVICE_ATTR(temp10_input, 0444, get_cpu_temp, NULL, 4); static SENSOR_DEVICE_ATTR(temp10_label, 0444, cpu_temp_label, NULL, 4); static SENSOR_DEVICE_ATTR(temp11_input, 0444, get_cpu_temp, NULL, 4); static SENSOR_DEVICE_ATTR(temp11_label, 0444, cpu_temp_label, NULL, 4); static SENSOR_DEVICE_ATTR(temp12_input, 0444, get_cpu_temp, NULL, 4); static SENSOR_DEVICE_ATTR(temp12_label, 0444, cpu_temp_label, NULL, 4); static SENSOR_DEVICE_ATTR(temp13_input, 0444, get_cpu_temp, NULL, 4); static SENSOR_DEVICE_ATTR(temp13_label, 0444, cpu_temp_label, NULL, 4); static SENSOR_DEVICE_ATTR(temp14_input, 0444, get_cpu_temp, NULL, 4); static SENSOR_DEVICE_ATTR(temp14_label, 0444, cpu_temp_label, NULL, 4); static SENSOR_DEVICE_ATTR(temp15_input, 0444, get_cpu_temp, NULL, 4); static SENSOR_DEVICE_ATTR(temp15_label, 0444, cpu_temp_label, NULL, 4); static SENSOR_DEVICE_ATTR(temp16_input, 0444, get_cpu_temp, NULL, 4); static SENSOR_DEVICE_ATTR(temp16_label, 0444, cpu_temp_label, NULL, 4); static struct attribute *cpu_hwmon_attributes[] = { &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp1_label.dev_attr.attr, &sensor_dev_attr_temp2_input.dev_attr.attr, &sensor_dev_attr_temp2_label.dev_attr.attr, &sensor_dev_attr_temp3_input.dev_attr.attr, &sensor_dev_attr_temp3_label.dev_attr.attr, &sensor_dev_attr_temp4_input.dev_attr.attr, &sensor_dev_attr_temp4_label.dev_attr.attr, &sensor_dev_attr_temp5_input.dev_attr.attr, &sensor_dev_attr_temp5_label.dev_attr.attr, &sensor_dev_attr_temp6_input.dev_attr.attr, &sensor_dev_attr_temp6_label.dev_attr.attr, &sensor_dev_attr_temp7_input.dev_attr.attr, &sensor_dev_attr_temp7_label.dev_attr.attr, &sensor_dev_attr_temp8_input.dev_attr.attr, &sensor_dev_attr_temp8_label.dev_attr.attr, &sensor_dev_attr_temp9_input.dev_attr.attr, &sensor_dev_attr_temp9_label.dev_attr.attr, &sensor_dev_attr_temp10_input.dev_attr.attr, &sensor_dev_attr_temp10_label.dev_attr.attr, &sensor_dev_attr_temp11_input.dev_attr.attr, &sensor_dev_attr_temp11_label.dev_attr.attr, &sensor_dev_attr_temp12_input.dev_attr.attr, &sensor_dev_attr_temp12_label.dev_attr.attr, &sensor_dev_attr_temp13_input.dev_attr.attr, &sensor_dev_attr_temp13_label.dev_attr.attr, &sensor_dev_attr_temp14_input.dev_attr.attr, &sensor_dev_attr_temp14_label.dev_attr.attr, &sensor_dev_attr_temp15_input.dev_attr.attr, &sensor_dev_attr_temp15_label.dev_attr.attr, &sensor_dev_attr_temp16_input.dev_attr.attr, &sensor_dev_attr_temp16_label.dev_attr.attr, NULL }; static umode_t cpu_hwmon_is_visible(struct kobject *kobj, struct attribute *attr, int i) { int id = i / 2; if (id < nr_packages) return attr->mode; return 0; } static struct attribute_group cpu_hwmon_group = { .attrs = cpu_hwmon_attributes, .is_visible = cpu_hwmon_is_visible, }; static const struct attribute_group *cpu_hwmon_groups[] = { &cpu_hwmon_group, NULL }; static int cpu_initial_threshold = 72000; static int cpu_thermal_threshold = 96000; module_param(cpu_thermal_threshold, int, 0644); MODULE_PARM_DESC(cpu_thermal_threshold, "cpu thermal threshold (96000 (default))"); static struct delayed_work thermal_work; static void do_thermal_timer(struct work_struct *work) { int i, value, temp_max = 0; for (i=0; i temp_max) temp_max = value; } if (temp_max <= cpu_thermal_threshold) schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000)); else orderly_poweroff(true); } static int __init loongson_hwmon_init(void) { int i, value, temp_max = 0; pr_info("Loongson Hwmon Enter...\n"); nr_packages = loongson_sysconf.nr_cpus / loongson_sysconf.cores_per_package; cpu_hwmon_dev = hwmon_device_register_with_groups(NULL, "cpu_hwmon", NULL, cpu_hwmon_groups); if (IS_ERR(cpu_hwmon_dev)) { pr_err("Hwmon register fail with %ld!\n", PTR_ERR(cpu_hwmon_dev)); return PTR_ERR(cpu_hwmon_dev); } for (i = 0; i < nr_packages; i++) { value = loongson3_cpu_temp(i); if (value > temp_max) temp_max = value; } pr_info("Initial CPU temperature is %d (highest).\n", temp_max); if (temp_max > cpu_initial_threshold) cpu_thermal_threshold += temp_max - cpu_initial_threshold; INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer); schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000)); return 0; } static void __exit loongson_hwmon_exit(void) { cancel_delayed_work_sync(&thermal_work); hwmon_device_unregister(cpu_hwmon_dev); } module_init(loongson_hwmon_init); module_exit(loongson_hwmon_exit); MODULE_AUTHOR("Yu Xiang "); MODULE_AUTHOR("Huacai Chen "); MODULE_DESCRIPTION("Loongson CPU Hwmon driver"); MODULE_LICENSE("GPL");