diff options
Diffstat (limited to 'drivers/platform/mips/cpu_hwmon.c')
| -rw-r--r-- | drivers/platform/mips/cpu_hwmon.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/drivers/platform/mips/cpu_hwmon.c b/drivers/platform/mips/cpu_hwmon.c new file mode 100644 index 000000000000..0f6c63e17049 --- /dev/null +++ b/drivers/platform/mips/cpu_hwmon.c @@ -0,0 +1,207 @@ +#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; + + reg = LOONGSON_CHIPTEMP(cpu); + if (loongson_sysconf.cputype == Loongson_3A) + reg = (reg >> 8) & 0xff; + else if (loongson_sysconf.cputype == Loongson_3B) + reg = ((reg >> 8) & 0xff) - 100; + + 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 Temprature\n"); +} + +static ssize_t cpu1_temp_label(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "CPU 1 Temprature\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 temprature 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"); |