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