1 #include <linux/err.h> 2 #include <linux/module.h> 3 #include <linux/reboot.h> 4 #include <linux/jiffies.h> 5 #include <linux/hwmon.h> 6 #include <linux/hwmon-sysfs.h> 7 8 #include <loongson.h> 9 #include <boot_param.h> 10 #include <loongson_hwmon.h> 11 12 /* 13 * Loongson-3 series cpu has two sensors inside, 14 * each of them from 0 to 255, 15 * if more than 127, that is dangerous. 16 * here only provide sensor1 data, because it always hot than sensor0 17 */ 18 int loongson3_cpu_temp(int cpu) 19 { 20 u32 reg, prid_rev; 21 22 reg = LOONGSON_CHIPTEMP(cpu); 23 prid_rev = read_c0_prid() & PRID_REV_MASK; 24 switch (prid_rev) { 25 case PRID_REV_LOONGSON3A_R1: 26 reg = (reg >> 8) & 0xff; 27 break; 28 case PRID_REV_LOONGSON3B_R1: 29 case PRID_REV_LOONGSON3B_R2: 30 case PRID_REV_LOONGSON3A_R2_0: 31 case PRID_REV_LOONGSON3A_R2_1: 32 reg = ((reg >> 8) & 0xff) - 100; 33 break; 34 case PRID_REV_LOONGSON3A_R3_0: 35 case PRID_REV_LOONGSON3A_R3_1: 36 reg = (reg & 0xffff)*731/0x4000 - 273; 37 break; 38 } 39 return (int)reg * 1000; 40 } 41 42 static int nr_packages; 43 static struct device *cpu_hwmon_dev; 44 45 static ssize_t get_hwmon_name(struct device *dev, 46 struct device_attribute *attr, char *buf); 47 static SENSOR_DEVICE_ATTR(name, S_IRUGO, get_hwmon_name, NULL, 0); 48 49 static struct attribute *cpu_hwmon_attributes[] = { 50 &sensor_dev_attr_name.dev_attr.attr, 51 NULL 52 }; 53 54 /* Hwmon device attribute group */ 55 static struct attribute_group cpu_hwmon_attribute_group = { 56 .attrs = cpu_hwmon_attributes, 57 }; 58 59 /* Hwmon device get name */ 60 static ssize_t get_hwmon_name(struct device *dev, 61 struct device_attribute *attr, char *buf) 62 { 63 return sprintf(buf, "cpu-hwmon\n"); 64 } 65 66 static ssize_t get_cpu_temp(struct device *dev, 67 struct device_attribute *attr, char *buf); 68 static ssize_t cpu_temp_label(struct device *dev, 69 struct device_attribute *attr, char *buf); 70 71 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu_temp, NULL, 1); 72 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu_temp_label, NULL, 1); 73 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu_temp, NULL, 2); 74 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu_temp_label, NULL, 2); 75 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, get_cpu_temp, NULL, 3); 76 static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, cpu_temp_label, NULL, 3); 77 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, get_cpu_temp, NULL, 4); 78 static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, cpu_temp_label, NULL, 4); 79 80 static const struct attribute *hwmon_cputemp[4][3] = { 81 { 82 &sensor_dev_attr_temp1_input.dev_attr.attr, 83 &sensor_dev_attr_temp1_label.dev_attr.attr, 84 NULL 85 }, 86 { 87 &sensor_dev_attr_temp2_input.dev_attr.attr, 88 &sensor_dev_attr_temp2_label.dev_attr.attr, 89 NULL 90 }, 91 { 92 &sensor_dev_attr_temp3_input.dev_attr.attr, 93 &sensor_dev_attr_temp3_label.dev_attr.attr, 94 NULL 95 }, 96 { 97 &sensor_dev_attr_temp4_input.dev_attr.attr, 98 &sensor_dev_attr_temp4_label.dev_attr.attr, 99 NULL 100 } 101 }; 102 103 static ssize_t cpu_temp_label(struct device *dev, 104 struct device_attribute *attr, char *buf) 105 { 106 int id = (to_sensor_dev_attr(attr))->index - 1; 107 return sprintf(buf, "CPU %d Temperature\n", id); 108 } 109 110 static ssize_t get_cpu_temp(struct device *dev, 111 struct device_attribute *attr, char *buf) 112 { 113 int id = (to_sensor_dev_attr(attr))->index - 1; 114 int value = loongson3_cpu_temp(id); 115 return sprintf(buf, "%d\n", value); 116 } 117 118 static int create_sysfs_cputemp_files(struct kobject *kobj) 119 { 120 int i, ret = 0; 121 122 for (i=0; i<nr_packages; i++) 123 ret = sysfs_create_files(kobj, hwmon_cputemp[i]); 124 125 return ret; 126 } 127 128 static void remove_sysfs_cputemp_files(struct kobject *kobj) 129 { 130 int i; 131 132 for (i=0; i<nr_packages; i++) 133 sysfs_remove_files(kobj, hwmon_cputemp[i]); 134 } 135 136 #define CPU_THERMAL_THRESHOLD 90000 137 static struct delayed_work thermal_work; 138 139 static void do_thermal_timer(struct work_struct *work) 140 { 141 int i, value, temp_max = 0; 142 143 for (i=0; i<nr_packages; i++) { 144 value = loongson3_cpu_temp(i); 145 if (value > temp_max) 146 temp_max = value; 147 } 148 149 if (temp_max <= CPU_THERMAL_THRESHOLD) 150 schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000)); 151 else 152 orderly_poweroff(true); 153 } 154 155 static int __init loongson_hwmon_init(void) 156 { 157 int ret; 158 159 pr_info("Loongson Hwmon Enter...\n"); 160 161 cpu_hwmon_dev = hwmon_device_register(NULL); 162 if (IS_ERR(cpu_hwmon_dev)) { 163 ret = -ENOMEM; 164 pr_err("hwmon_device_register fail!\n"); 165 goto fail_hwmon_device_register; 166 } 167 168 nr_packages = loongson_sysconf.nr_cpus / 169 loongson_sysconf.cores_per_package; 170 171 ret = sysfs_create_group(&cpu_hwmon_dev->kobj, 172 &cpu_hwmon_attribute_group); 173 if (ret) { 174 pr_err("fail to create loongson hwmon!\n"); 175 goto fail_sysfs_create_group_hwmon; 176 } 177 178 ret = create_sysfs_cputemp_files(&cpu_hwmon_dev->kobj); 179 if (ret) { 180 pr_err("fail to create cpu temperature interface!\n"); 181 goto fail_create_sysfs_cputemp_files; 182 } 183 184 INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer); 185 schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000)); 186 187 return ret; 188 189 fail_create_sysfs_cputemp_files: 190 sysfs_remove_group(&cpu_hwmon_dev->kobj, 191 &cpu_hwmon_attribute_group); 192 193 fail_sysfs_create_group_hwmon: 194 hwmon_device_unregister(cpu_hwmon_dev); 195 196 fail_hwmon_device_register: 197 return ret; 198 } 199 200 static void __exit loongson_hwmon_exit(void) 201 { 202 cancel_delayed_work_sync(&thermal_work); 203 remove_sysfs_cputemp_files(&cpu_hwmon_dev->kobj); 204 sysfs_remove_group(&cpu_hwmon_dev->kobj, 205 &cpu_hwmon_attribute_group); 206 hwmon_device_unregister(cpu_hwmon_dev); 207 } 208 209 module_init(loongson_hwmon_init); 210 module_exit(loongson_hwmon_exit); 211 212 MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>"); 213 MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>"); 214 MODULE_DESCRIPTION("Loongson CPU Hwmon driver"); 215 MODULE_LICENSE("GPL"); 216