208 lines
5.3 KiB
C
208 lines
5.3 KiB
C
#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/reboot.h>
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#include <linux/jiffies.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <loongson.h>
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#include <boot_param.h>
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#include <loongson_hwmon.h>
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/*
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* Loongson-3 series cpu has two sensors inside,
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* each of them from 0 to 255,
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* if more than 127, that is dangerous.
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* here only provide sensor1 data, because it always hot than sensor0
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*/
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int loongson3_cpu_temp(int cpu)
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{
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u32 reg;
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reg = LOONGSON_CHIPTEMP(cpu);
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if ((read_c0_prid() & PRID_REV_MASK) == PRID_REV_LOONGSON3A_R1)
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reg = (reg >> 8) & 0xff;
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else
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reg = ((reg >> 8) & 0xff) - 100;
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return (int)reg * 1000;
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}
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static struct device *cpu_hwmon_dev;
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static ssize_t get_hwmon_name(struct device *dev,
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struct device_attribute *attr, char *buf);
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static SENSOR_DEVICE_ATTR(name, S_IRUGO, get_hwmon_name, NULL, 0);
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static struct attribute *cpu_hwmon_attributes[] = {
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&sensor_dev_attr_name.dev_attr.attr,
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NULL
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};
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/* Hwmon device attribute group */
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static struct attribute_group cpu_hwmon_attribute_group = {
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.attrs = cpu_hwmon_attributes,
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};
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/* Hwmon device get name */
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static ssize_t get_hwmon_name(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "cpu-hwmon\n");
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}
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static ssize_t get_cpu0_temp(struct device *dev,
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struct device_attribute *attr, char *buf);
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static ssize_t get_cpu1_temp(struct device *dev,
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struct device_attribute *attr, char *buf);
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static ssize_t cpu0_temp_label(struct device *dev,
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struct device_attribute *attr, char *buf);
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static ssize_t cpu1_temp_label(struct device *dev,
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struct device_attribute *attr, char *buf);
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu0_temp, NULL, 1);
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static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu0_temp_label, NULL, 1);
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static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu1_temp, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu1_temp_label, NULL, 2);
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static const struct attribute *hwmon_cputemp1[] = {
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_label.dev_attr.attr,
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NULL
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};
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static const struct attribute *hwmon_cputemp2[] = {
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&sensor_dev_attr_temp2_input.dev_attr.attr,
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&sensor_dev_attr_temp2_label.dev_attr.attr,
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NULL
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};
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static ssize_t cpu0_temp_label(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "CPU 0 Temperature\n");
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}
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static ssize_t cpu1_temp_label(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "CPU 1 Temperature\n");
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}
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static ssize_t get_cpu0_temp(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int value = loongson3_cpu_temp(0);
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return sprintf(buf, "%d\n", value);
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}
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static ssize_t get_cpu1_temp(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int value = loongson3_cpu_temp(1);
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return sprintf(buf, "%d\n", value);
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}
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static int create_sysfs_cputemp_files(struct kobject *kobj)
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{
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int ret;
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ret = sysfs_create_files(kobj, hwmon_cputemp1);
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if (ret)
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goto sysfs_create_temp1_fail;
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if (loongson_sysconf.nr_cpus <= loongson_sysconf.cores_per_package)
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return 0;
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ret = sysfs_create_files(kobj, hwmon_cputemp2);
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if (ret)
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goto sysfs_create_temp2_fail;
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return 0;
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sysfs_create_temp2_fail:
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sysfs_remove_files(kobj, hwmon_cputemp1);
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sysfs_create_temp1_fail:
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return -1;
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}
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static void remove_sysfs_cputemp_files(struct kobject *kobj)
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{
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sysfs_remove_files(&cpu_hwmon_dev->kobj, hwmon_cputemp1);
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if (loongson_sysconf.nr_cpus > loongson_sysconf.cores_per_package)
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sysfs_remove_files(&cpu_hwmon_dev->kobj, hwmon_cputemp2);
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}
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#define CPU_THERMAL_THRESHOLD 90000
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static struct delayed_work thermal_work;
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static void do_thermal_timer(struct work_struct *work)
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{
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int value = loongson3_cpu_temp(0);
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if (value <= CPU_THERMAL_THRESHOLD)
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schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000));
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else
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orderly_poweroff(true);
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}
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static int __init loongson_hwmon_init(void)
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{
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int ret;
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pr_info("Loongson Hwmon Enter...\n");
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cpu_hwmon_dev = hwmon_device_register(NULL);
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if (IS_ERR(cpu_hwmon_dev)) {
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ret = PTR_ERR(cpu_hwmon_dev);
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pr_err("hwmon_device_register fail!\n");
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goto fail_hwmon_device_register;
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}
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ret = sysfs_create_group(&cpu_hwmon_dev->kobj,
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&cpu_hwmon_attribute_group);
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if (ret) {
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pr_err("fail to create loongson hwmon!\n");
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goto fail_sysfs_create_group_hwmon;
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}
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ret = create_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
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if (ret) {
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pr_err("fail to create cpu temperature interface!\n");
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goto fail_create_sysfs_cputemp_files;
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}
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INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer);
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schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000));
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return ret;
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fail_create_sysfs_cputemp_files:
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sysfs_remove_group(&cpu_hwmon_dev->kobj,
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&cpu_hwmon_attribute_group);
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fail_sysfs_create_group_hwmon:
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hwmon_device_unregister(cpu_hwmon_dev);
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fail_hwmon_device_register:
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return ret;
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}
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static void __exit loongson_hwmon_exit(void)
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{
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cancel_delayed_work_sync(&thermal_work);
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remove_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
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sysfs_remove_group(&cpu_hwmon_dev->kobj,
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&cpu_hwmon_attribute_group);
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hwmon_device_unregister(cpu_hwmon_dev);
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}
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module_init(loongson_hwmon_init);
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module_exit(loongson_hwmon_exit);
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MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>");
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MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>");
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MODULE_DESCRIPTION("Loongson CPU Hwmon driver");
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MODULE_LICENSE("GPL");
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