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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 */
18int loongson3_cpu_temp(int cpu)
19{
20 u32 reg;
21
22 reg = LOONGSON_CHIPTEMP(cpu);
23 if (loongson_sysconf.cputype == Loongson_3A)
24 reg = (reg >> 8) & 0xff;
25 else if (loongson_sysconf.cputype == Loongson_3B)
26 reg = ((reg >> 8) & 0xff) - 100;
27
28 return (int)reg * 1000;
29}
30
31static struct device *cpu_hwmon_dev;
32
33static ssize_t get_hwmon_name(struct device *dev,
34 struct device_attribute *attr, char *buf);
35static SENSOR_DEVICE_ATTR(name, S_IRUGO, get_hwmon_name, NULL, 0);
36
37static struct attribute *cpu_hwmon_attributes[] = {
38 &sensor_dev_attr_name.dev_attr.attr,
39 NULL
40};
41
42/* Hwmon device attribute group */
43static struct attribute_group cpu_hwmon_attribute_group = {
44 .attrs = cpu_hwmon_attributes,
45};
46
47/* Hwmon device get name */
48static ssize_t get_hwmon_name(struct device *dev,
49 struct device_attribute *attr, char *buf)
50{
51 return sprintf(buf, "cpu-hwmon\n");
52}
53
54static ssize_t get_cpu0_temp(struct device *dev,
55 struct device_attribute *attr, char *buf);
56static ssize_t get_cpu1_temp(struct device *dev,
57 struct device_attribute *attr, char *buf);
58static ssize_t cpu0_temp_label(struct device *dev,
59 struct device_attribute *attr, char *buf);
60static ssize_t cpu1_temp_label(struct device *dev,
61 struct device_attribute *attr, char *buf);
62
63static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu0_temp, NULL, 1);
64static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu0_temp_label, NULL, 1);
65static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu1_temp, NULL, 2);
66static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu1_temp_label, NULL, 2);
67
68static const struct attribute *hwmon_cputemp1[] = {
69 &sensor_dev_attr_temp1_input.dev_attr.attr,
70 &sensor_dev_attr_temp1_label.dev_attr.attr,
71 NULL
72};
73
74static const struct attribute *hwmon_cputemp2[] = {
75 &sensor_dev_attr_temp2_input.dev_attr.attr,
76 &sensor_dev_attr_temp2_label.dev_attr.attr,
77 NULL
78};
79
80static ssize_t cpu0_temp_label(struct device *dev,
81 struct device_attribute *attr, char *buf)
82{
83 return sprintf(buf, "CPU 0 Temprature\n");
84}
85
86static ssize_t cpu1_temp_label(struct device *dev,
87 struct device_attribute *attr, char *buf)
88{
89 return sprintf(buf, "CPU 1 Temprature\n");
90}
91
92static ssize_t get_cpu0_temp(struct device *dev,
93 struct device_attribute *attr, char *buf)
94{
95 int value = loongson3_cpu_temp(0);
96 return sprintf(buf, "%d\n", value);
97}
98
99static ssize_t get_cpu1_temp(struct device *dev,
100 struct device_attribute *attr, char *buf)
101{
102 int value = loongson3_cpu_temp(1);
103 return sprintf(buf, "%d\n", value);
104}
105
106static int create_sysfs_cputemp_files(struct kobject *kobj)
107{
108 int ret;
109
110 ret = sysfs_create_files(kobj, hwmon_cputemp1);
111 if (ret)
112 goto sysfs_create_temp1_fail;
113
114 if (loongson_sysconf.nr_cpus <= loongson_sysconf.cores_per_package)
115 return 0;
116
117 ret = sysfs_create_files(kobj, hwmon_cputemp2);
118 if (ret)
119 goto sysfs_create_temp2_fail;
120
121 return 0;
122
123sysfs_create_temp2_fail:
124 sysfs_remove_files(kobj, hwmon_cputemp1);
125
126sysfs_create_temp1_fail:
127 return -1;
128}
129
130static void remove_sysfs_cputemp_files(struct kobject *kobj)
131{
132 sysfs_remove_files(&cpu_hwmon_dev->kobj, hwmon_cputemp1);
133
134 if (loongson_sysconf.nr_cpus > loongson_sysconf.cores_per_package)
135 sysfs_remove_files(&cpu_hwmon_dev->kobj, hwmon_cputemp2);
136}
137
138#define CPU_THERMAL_THRESHOLD 90000
139static struct delayed_work thermal_work;
140
141static void do_thermal_timer(struct work_struct *work)
142{
143 int value = loongson3_cpu_temp(0);
144 if (value <= CPU_THERMAL_THRESHOLD)
145 schedule_delayed_work(&thermal_work, msecs_to_jiffies(5000));
146 else
147 orderly_poweroff(true);
148}
149
150static int __init loongson_hwmon_init(void)
151{
152 int ret;
153
154 pr_info("Loongson Hwmon Enter...\n");
155
156 cpu_hwmon_dev = hwmon_device_register(NULL);
157 if (IS_ERR(cpu_hwmon_dev)) {
158 ret = -ENOMEM;
159 pr_err("hwmon_device_register fail!\n");
160 goto fail_hwmon_device_register;
161 }
162
163 ret = sysfs_create_group(&cpu_hwmon_dev->kobj,
164 &cpu_hwmon_attribute_group);
165 if (ret) {
166 pr_err("fail to create loongson hwmon!\n");
167 goto fail_sysfs_create_group_hwmon;
168 }
169
170 ret = create_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
171 if (ret) {
172 pr_err("fail to create cpu temprature interface!\n");
173 goto fail_create_sysfs_cputemp_files;
174 }
175
176 INIT_DEFERRABLE_WORK(&thermal_work, do_thermal_timer);
177 schedule_delayed_work(&thermal_work, msecs_to_jiffies(20000));
178
179 return ret;
180
181fail_create_sysfs_cputemp_files:
182 sysfs_remove_group(&cpu_hwmon_dev->kobj,
183 &cpu_hwmon_attribute_group);
184
185fail_sysfs_create_group_hwmon:
186 hwmon_device_unregister(cpu_hwmon_dev);
187
188fail_hwmon_device_register:
189 return ret;
190}
191
192static void __exit loongson_hwmon_exit(void)
193{
194 cancel_delayed_work_sync(&thermal_work);
195 remove_sysfs_cputemp_files(&cpu_hwmon_dev->kobj);
196 sysfs_remove_group(&cpu_hwmon_dev->kobj,
197 &cpu_hwmon_attribute_group);
198 hwmon_device_unregister(cpu_hwmon_dev);
199}
200
201module_init(loongson_hwmon_init);
202module_exit(loongson_hwmon_exit);
203
204MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>");
205MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>");
206MODULE_DESCRIPTION("Loongson CPU Hwmon driver");
207MODULE_LICENSE("GPL");
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 */
18int 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
40static int nr_packages;
41static struct device *cpu_hwmon_dev;
42
43static ssize_t get_hwmon_name(struct device *dev,
44 struct device_attribute *attr, char *buf);
45static SENSOR_DEVICE_ATTR(name, S_IRUGO, get_hwmon_name, NULL, 0);
46
47static struct attribute *cpu_hwmon_attributes[] = {
48 &sensor_dev_attr_name.dev_attr.attr,
49 NULL
50};
51
52/* Hwmon device attribute group */
53static struct attribute_group cpu_hwmon_attribute_group = {
54 .attrs = cpu_hwmon_attributes,
55};
56
57/* Hwmon device get name */
58static 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
64static ssize_t get_cpu_temp(struct device *dev,
65 struct device_attribute *attr, char *buf);
66static ssize_t cpu_temp_label(struct device *dev,
67 struct device_attribute *attr, char *buf);
68
69static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_cpu_temp, NULL, 1);
70static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, cpu_temp_label, NULL, 1);
71static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_cpu_temp, NULL, 2);
72static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, cpu_temp_label, NULL, 2);
73static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, get_cpu_temp, NULL, 3);
74static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, cpu_temp_label, NULL, 3);
75static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, get_cpu_temp, NULL, 4);
76static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, cpu_temp_label, NULL, 4);
77
78static 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
101static 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
108static 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
116static 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
126static 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
135static struct delayed_work thermal_work;
136
137static 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
153static 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
187fail_create_sysfs_cputemp_files:
188 sysfs_remove_group(&cpu_hwmon_dev->kobj,
189 &cpu_hwmon_attribute_group);
190
191fail_sysfs_create_group_hwmon:
192 hwmon_device_unregister(cpu_hwmon_dev);
193
194fail_hwmon_device_register:
195 return ret;
196}
197
198static 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
207module_init(loongson_hwmon_init);
208module_exit(loongson_hwmon_exit);
209
210MODULE_AUTHOR("Yu Xiang <xiangy@lemote.com>");
211MODULE_AUTHOR("Huacai Chen <chenhc@lemote.com>");
212MODULE_DESCRIPTION("Loongson CPU Hwmon driver");
213MODULE_LICENSE("GPL");