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_LOONGSON3A_R2: 29 case PRID_REV_LOONGSON3B_R1: 30 case PRID_REV_LOONGSON3B_R2: 31 reg = ((reg >> 8) & 0xff) - 100; 32 break; 33 case PRID_REV_LOONGSON3A_R3_0: 34 case PRID_REV_LOONGSON3A_R3_1: 35 reg = (reg & 0xffff)*731/0x4000 - 273; 36 break; 37 } 38 return (int)reg * 1000; 39 } 40 41 static int nr_packages; 42 static struct device *cpu_hwmon_dev; 43 44 static ssize_t get_hwmon_name(struct device *dev, 45 struct device_attribute *attr, char *buf); 46 static SENSOR_DEVICE_ATTR(name, S_IRUGO, get_hwmon_name, NULL, 0); 47 48 static struct attribute *cpu_hwmon_attributes[] = { 49 &sensor_dev_attr_name.dev_attr.attr, 50 NULL 51 }; 52 53 /* Hwmon device attribute group */ 54 static struct attribute_group cpu_hwmon_attribute_group = { 55 .attrs = cpu_hwmon_attributes, 56 }; 57 58 /* Hwmon device get name */ 59 static ssize_t get_hwmon_name(struct device *dev, 60 struct device_attribute *attr, char *buf) 61 { 62 return sprintf(buf, "cpu-hwmon\n"); 63 } 64 65 static ssize_t get_cpu_temp(struct device *dev, 66 struct device_attribute *attr, char *buf); 67 static ssize_t cpu_temp_label(struct device *dev, 68 struct device_attribute *attr, char *buf); 69 70 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu_temp, NULL, 1); 71 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu_temp_label, NULL, 1); 72 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu_temp, NULL, 2); 73 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu_temp_label, NULL, 2); 74 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, get_cpu_temp, NULL, 3); 75 static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, cpu_temp_label, NULL, 3); 76 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, get_cpu_temp, NULL, 4); 77 static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, cpu_temp_label, NULL, 4); 78 79 static const struct attribute *hwmon_cputemp[4][3] = { 80 { 81 &sensor_dev_attr_temp1_input.dev_attr.attr, 82 &sensor_dev_attr_temp1_label.dev_attr.attr, 83 NULL 84 }, 85 { 86 &sensor_dev_attr_temp2_input.dev_attr.attr, 87 &sensor_dev_attr_temp2_label.dev_attr.attr, 88 NULL 89 }, 90 { 91 &sensor_dev_attr_temp3_input.dev_attr.attr, 92 &sensor_dev_attr_temp3_label.dev_attr.attr, 93 NULL 94 }, 95 { 96 &sensor_dev_attr_temp4_input.dev_attr.attr, 97 &sensor_dev_attr_temp4_label.dev_attr.attr, 98 NULL 99 } 100 }; 101 102 static ssize_t cpu_temp_label(struct device *dev, 103 struct device_attribute *attr, char *buf) 104 { 105 int id = (to_sensor_dev_attr(attr))->index - 1; 106 return sprintf(buf, "CPU %d Temperature\n", id); 107 } 108 109 static ssize_t get_cpu_temp(struct device *dev, 110 struct device_attribute *attr, char *buf) 111 { 112 int id = (to_sensor_dev_attr(attr))->index - 1; 113 int value = loongson3_cpu_temp(id); 114 return sprintf(buf, "%d\n", value); 115 } 116 117 static int create_sysfs_cputemp_files(struct kobject *kobj) 118 { 119 int i, ret = 0; 120 121 for (i=0; i<nr_packages; i++) 122 ret = sysfs_create_files(kobj, hwmon_cputemp[i]); 123 124 return ret; 125 } 126 127 static void remove_sysfs_cputemp_files(struct kobject *kobj) 128 { 129 int i; 130 131 for (i=0; i<nr_packages; i++) 132 sysfs_remove_files(kobj, hwmon_cputemp[i]); 133 } 134 135 #define CPU_THERMAL_THRESHOLD 90000 136 static struct delayed_work thermal_work; 137 138 static void do_thermal_timer(struct work_struct *work) 139 { 140 int i, value, temp_max = 0; 141 142 for (i=0; i<nr_packages; i++) { 143 value = loongson3_cpu_temp(i); 144 if (value > temp_max) 145 temp_max = value; 146 } 147 148 if (temp_max <= CPU_THERMAL_THRESHOLD) 149 schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000)); 150 else 151 orderly_poweroff(true); 152 } 153 154 static int __init loongson_hwmon_init(void) 155 { 156 int ret; 157 158 pr_info("Loongson Hwmon Enter...\n"); 159 160 cpu_hwmon_dev = hwmon_device_register(NULL); 161 if (IS_ERR(cpu_hwmon_dev)) { 162 ret = -ENOMEM; 163 pr_err("hwmon_device_register fail!\n"); 164 goto fail_hwmon_device_register; 165 } 166 167 nr_packages = loongson_sysconf.nr_cpus / 168 loongson_sysconf.cores_per_package; 169 170 ret = sysfs_create_group(&cpu_hwmon_dev->kobj, 171 &cpu_hwmon_attribute_group); 172 if (ret) { 173 pr_err("fail to create loongson hwmon!\n"); 174 goto fail_sysfs_create_group_hwmon; 175 } 176 177 ret = create_sysfs_cputemp_files(&cpu_hwmon_dev->kobj); 178 if (ret) { 179 pr_err("fail to create cpu temperature interface!\n"); 180 goto fail_create_sysfs_cputemp_files; 181 } 182 183 INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer); 184 schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000)); 185 186 return ret; 187 188 fail_create_sysfs_cputemp_files: 189 sysfs_remove_group(&cpu_hwmon_dev->kobj, 190 &cpu_hwmon_attribute_group); 191 192 fail_sysfs_create_group_hwmon: 193 hwmon_device_unregister(cpu_hwmon_dev); 194 195 fail_hwmon_device_register: 196 return ret; 197 } 198 199 static void __exit loongson_hwmon_exit(void) 200 { 201 cancel_delayed_work_sync(&thermal_work); 202 remove_sysfs_cputemp_files(&cpu_hwmon_dev->kobj); 203 sysfs_remove_group(&cpu_hwmon_dev->kobj, 204 &cpu_hwmon_attribute_group); 205 hwmon_device_unregister(cpu_hwmon_dev); 206 } 207 208 module_init(loongson_hwmon_init); 209 module_exit(loongson_hwmon_exit); 210 211 MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>"); 212 MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>"); 213 MODULE_DESCRIPTION("Loongson CPU Hwmon driver"); 214 MODULE_LICENSE("GPL"); 215