高通android设备themal读取cpu温度

以msm8953的themal分布信息，主要是下图的位置：

这其中 cpu相关的themal的位置有：

读取thermal 温度数据可以通过以下几个步骤：

获取sensor_info

1. root@msm8953_64:/ # cat /sys/module/msm_thermal/sensor_info
   
2. tsens:tsens_tz_sensor0::10
   
3. tsens:tsens_tz_sensor1::10
   
4. tsens:tsens_tz_sensor2:pop_mem:10
   
5. tsens:tsens_tz_sensor3::10
   
6. tsens:tsens_tz_sensor4:cpu4:10
   
7. tsens:tsens_tz_sensor5:cpu5:10
   
8. tsens:tsens_tz_sensor6:cpu6:10
   
9. tsens:tsens_tz_sensor7:cpu7:10
   
10. tsens:tsens_tz_sensor8:L2_cache_1:10
    
11. tsens:tsens_tz_sensor9:cpu0:10
    
12. tsens:tsens_tz_sensor10:cpu1:10
    
13. tsens:tsens_tz_sensor11:cpu2:10
    
14. tsens:tsens_tz_sensor12:cpu3:10
    
15. tsens:tsens_tz_sensor13:L2_cache_0:10
    
16. tsens:tsens_tz_sensor14::10
    
17. tsens:tsens_tz_sensor15:gpu:10
    
18. alarm:pm8953_tz::1000
    
19. adc:pa_therm0::1
    
20. adc:pa_therm1::1
    
21. adc:xo_therm::1
    
22. adc:xo_therm_buf::1
    
23. adc:case_therm::1
    

在/sys/class/thermal/ 路径下可以看到所有的thermal_zone

1. msm8953_64:/sys/class/thermal # ls
   
2. thermal_zone0 thermal_zone11 thermal_zone14 thermal_zone17 thermal_zone2 thermal_zone22 thermal_zone4 thermal_zone7
   
3. thermal_zone1 thermal_zone12 thermal_zone15 thermal_zone18 thermal_zone20 thermal_zone23 thermal_zone5 thermal_zone8
   
4. thermal_zone10 thermal_zone13 thermal_zone16 thermal_zone19 thermal_zone21 thermal_zone3 thermal_zone6 thermal_zone9
   

那么怎么知道具体的温度信息就需要结合上面的sensor_info来对比分析了。

先获取所有的tmpe信息：

1. msm8953_64:/sys/class/thermal # cat */temp
   
2. 25000
   
3. -40
   
4. 309
   
5. 309
   
6. 313
   
7. 322
   
8. 309
   
9. 306
   
10. 309
    
11. 319
    
12. 313
    
13. 303
    
14. 31
    
15. 306
    
16. 32636
    
17. 30
    
18. 25000
    
19. 30
    
20. 7
    
21. 24612
    
22. 306
    
23. 306
    
24. 306
    
25. 322
    
26. bms
    

每个节点对应的type

1. msm8953_64:/sys/class/thermal # cat */type
   
2. bms
   
3. pa_therm1
   
4. tsens_tz_sensor5
   
5. tsens_tz_sensor6
   
6. tsens_tz_sensor7
   
7. tsens_tz_sensor8
   
8. tsens_tz_sensor9
   
9. tsens_tz_sensor10
   
10. tsens_tz_sensor11
    
11. tsens_tz_sensor12
    
12. tsens_tz_sensor13
    
13. tsens_tz_sensor14
    
14. xo_therm
    
15. tsens_tz_sensor15
    
16. pm8953_tz
    
17. pa_therm0
    
18. battery
    
19. xo_therm_buf
    
20. case_therm
    
21. chg_temp
    
22. tsens_tz_sensor1
    
23. tsens_tz_sensor2
    
24. tsens_tz_sensor3
    
25. tsens_tz_sensor4
    

这3者信息相结合，即可得到该thermal的温度信息；

举一个例子：

thermal_zone10 –> tsens_tz_sensor5 -> 309

在sensor_info中这个节点的信息是tsens:tsens_tz_sensor5:cpu5:10

最后的10 表示比例是1：10，也就是表示309是表示cpu5的温度是30.9摄氏度。