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#include <linux/err.h>
#include <linux/module.h>
#include <linux/reboot.h>
#include <linux/jiffies.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <loongson.h>
#include <boot_param.h>
#include <loongson_hwmon.h>
/*
* Loongson-3 series cpu has two sensors inside,
* each of them from 0 to 255,
* if more than 127, that is dangerous.
* here only provide sensor1 data, because it always hot than sensor0
*/
int loongson3_cpu_temp(int cpu)
{
u32 reg, prid_rev;
reg = LOONGSON_CHIPTEMP(cpu);
prid_rev = read_c0_prid() & PRID_REV_MASK;
switch (prid_rev) {
case PRID_REV_LOONGSON3A_R1:
reg = (reg >> 8) & 0xff;
break;
case PRID_REV_LOONGSON3A_R2:
case PRID_REV_LOONGSON3B_R1:
case PRID_REV_LOONGSON3B_R2:
reg = ((reg >> 8) & 0xff) - 100;
break;
case PRID_REV_LOONGSON3A_R3:
reg = (reg & 0xffff)*731/0x4000 - 273;
break;
}
return (int)reg * 1000;
}
static struct device *cpu_hwmon_dev;
static ssize_t get_hwmon_name(struct device *dev,
struct device_attribute *attr, char *buf);
static SENSOR_DEVICE_ATTR(name, S_IRUGO, get_hwmon_name, NULL, 0);
static struct attribute *cpu_hwmon_attributes[] = {
&sensor_dev_attr_name.dev_attr.attr,
NULL
};
/* Hwmon device attribute group */
static struct attribute_group cpu_hwmon_attribute_group = {
.attrs = cpu_hwmon_attributes,
};
/* Hwmon device get name */
static ssize_t get_hwmon_name(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "cpu-hwmon\n");
}
static ssize_t get_cpu0_temp(struct device *dev,
struct device_attribute *attr, char *buf);
static ssize_t get_cpu1_temp(struct device *dev,
struct device_attribute *attr, char *buf);
static ssize_t cpu0_temp_label(struct device *dev,
struct device_attribute *attr, char *buf);
static ssize_t cpu1_temp_label(struct device *dev,
struct device_attribute *attr, char *buf);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu0_temp, NULL, 1);
static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu0_temp_label, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu1_temp, NULL, 2);
static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu1_temp_label, NULL, 2);
static const struct attribute *hwmon_cputemp1[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp1_label.dev_attr.attr,
NULL
};
static const struct attribute *hwmon_cputemp2[] = {
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp2_label.dev_attr.attr,
NULL
};
static ssize_t cpu0_temp_label(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "CPU 0 Temperature\n");
}
static ssize_t cpu1_temp_label(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "CPU 1 Temperature\n");
}
static ssize_t get_cpu0_temp(struct device *dev,
struct device_attribute *attr, char *buf)
{
int value = loongson3_cpu_temp(0);
return sprintf(buf, "%d\n", value);
}
static ssize_t get_cpu1_temp(struct device *dev,
struct device_attribute *attr, char *buf)
{
int value = loongson3_cpu_temp(1);
return sprintf(buf, "%d\n", value);
}
static int create_sysfs_cputemp_files(struct kobject *kobj)
{
int ret;
ret = sysfs_create_files(kobj, hwmon_cputemp1);
if (ret)
goto sysfs_create_temp1_fail;
if (loongson_sysconf.nr_cpus <= loongson_sysconf.cores_per_package)
return 0;
ret = sysfs_create_files(kobj, hwmon_cputemp2);
if (ret)
goto sysfs_create_temp2_fail;
return 0;
sysfs_create_temp2_fail:
sysfs_remove_files(kobj, hwmon_cputemp1);
sysfs_create_temp1_fail:
return -1;
}
static void remove_sysfs_cputemp_files(struct kobject *kobj)
{
sysfs_remove_files(&cpu_hwmon_dev->kobj, hwmon_cputemp1);
if (loongson_sysconf.nr_cpus > loongson_sysconf.cores_per_package)
sysfs_remove_files(&cpu_hwmon_dev->kobj, hwmon_cputemp2);
}
#define CPU_THERMAL_THRESHOLD 90000
static struct delayed_work thermal_work;
static void do_thermal_timer(struct work_struct *work)
{
int value = loongson3_cpu_temp(0);
if (value <= CPU_THERMAL_THRESHOLD)
schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000));
else
orderly_poweroff(true);
}
static int __init loongson_hwmon_init(void)
{
int ret;
pr_info("Loongson Hwmon Enter...\n");
cpu_hwmon_dev = hwmon_device_register(NULL);
if (IS_ERR(cpu_hwmon_dev)) {
ret = -ENOMEM;
pr_err("hwmon_device_register fail!\n");
goto fail_hwmon_device_register;
}
ret = sysfs_create_group(&cpu_hwmon_dev->kobj,
&cpu_hwmon_attribute_group);
if (ret) {
pr_err("fail to create loongson hwmon!\n");
goto fail_sysfs_create_group_hwmon;
}
ret = create_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
if (ret) {
pr_err("fail to create cpu temperature interface!\n");
goto fail_create_sysfs_cputemp_files;
}
INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer);
schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000));
return ret;
fail_create_sysfs_cputemp_files:
sysfs_remove_group(&cpu_hwmon_dev->kobj,
&cpu_hwmon_attribute_group);
fail_sysfs_create_group_hwmon:
hwmon_device_unregister(cpu_hwmon_dev);
fail_hwmon_device_register:
return ret;
}
static void __exit loongson_hwmon_exit(void)
{
cancel_delayed_work_sync(&thermal_work);
remove_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
sysfs_remove_group(&cpu_hwmon_dev->kobj,
&cpu_hwmon_attribute_group);
hwmon_device_unregister(cpu_hwmon_dev);
}
module_init(loongson_hwmon_init);
module_exit(loongson_hwmon_exit);
MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>");
MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>");
MODULE_DESCRIPTION("Loongson CPU Hwmon driver");
MODULE_LICENSE("GPL");
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