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Linux设备驱动 -- TMP75AIDR温度芯片驱动移植

  • 2026-04-20 13:39:52
Linux设备驱动 -- TMP75AIDR温度芯片驱动移植

查看原理图

TMP75AIDR和RK3568采用I2C通信,使用I2C5。

根据TMP75AIDR芯片手册知道I2C地址是由A0 A1 A2决定的。

此原理图芯片I2C地址是0x48。

内核支持

内核中已经有该芯片的驱动支持,使用的是hwmon子系统实现的驱动。

驱动源码位置:kernel/drivers/hwmon/lm75.c

源码文件中定义了支持的设备:

staticconststructof_device_idlm75_of_match[] = {    { .compatible = "adi,adt75", .data = (void *)adt75 },    { .compatible = "dallas,ds1775", .data = (void *)ds1775 },    { .compatible = "dallas,ds75", .data = (void *)ds75 },    { .compatible = "dallas,ds7505", .data = (void *)ds7505 },    { .compatible = "gmt,g751", .data = (void *)g751 },    { .compatible = "national,lm75", .data = (void *)lm75 },    { .compatible = "national,lm75a", .data = (void *)lm75a },    { .compatible = "national,lm75b", .data = (void *)lm75b },    { .compatible = "maxim,max6625", .data = (void *)max6625 },    { .compatible = "maxim,max6626", .data = (void *)max6626 },    { .compatible = "maxim,mcp980x", .data = (void *)mcp980x },    { .compatible = "st,stds75", .data = (void *)stds75 },    { .compatible = "microchip,tcn75", .data = (void *)tcn75 },    { .compatible = "ti,tmp100", .data = (void *)tmp100 },    { .compatible = "ti,tmp101", .data = (void *)tmp101 },    { .compatible = "ti,tmp105", .data = (void *)tmp105 },    { .compatible = "ti,tmp112", .data = (void *)tmp112 },    { .compatible = "ti,tmp175", .data = (void *)tmp175 },    { .compatible = "ti,tmp275", .data = (void *)tmp275 },    { .compatible = "ti,tmp75", .data = (void *)tmp75 },    { .compatible = "ti,tmp75c", .data = (void *)tmp75c },    { },};

驱动通过I2C子系统注册:

staticstructi2c_driverlm75_driver = {    .class        = I2C_CLASS_HWMON,    .driver = {        .name    = "lm75",        .of_match_table = of_match_ptr(lm75_of_match),        .pm    = LM75_DEV_PM_OPS,    },    .probe        = lm75_probe,    .id_table    = lm75_ids,    .detect        = lm75_detect,    .address_list    = normal_i2c,};module_i2c_driver(lm75_driver);

驱动提供的功能:

  • 温度读取(支持9-12位分辨率)
  • 温度上限设置
  • 温度滞后设置
  • 通过hwmon子系统暴露到用户空间
  • 支持设备树自动探测

配置内核使能支持TMP75AIDR

Device Drivers  --->     <*> Hardware Monitoring support  --->         <*>   National Semiconductor LM75 and compatibles

内核配置项,确保其值等于y:

CONFIG_SENSORS_LM75=y

配置选项定义文件:kernel/drivers/hwmon/Kconfig

编写设备树节点

&i2c5 {    …    …    tmp75aidr: tmp75@48 {        compatible = " ti,tmp75";        reg = <0x48>;        status = "okay";    };};
  • compatible属性:值必须为ti,tmp75

  • reg属性:设备的i2c地址,根据原理图得知其值是0x48。

  • status值必须是okay,表示已启用。

编写配置好设备树节点,重新编译内核。

用户空间访问

驱动加载后,会在sysfs中生成相应节点,可直接通过如下方式读取温度:

root@M3:~# ls /sys/class/hwmon/hwmon0/device  of_node  subsystem    temp1_max       ueventname    power    temp1_input  temp1_max_hyst  update_interval查看hwmon设备ls /sys/class/hwmon/读取温度值cat /sys/class/hwmon/hwmon0/temp1_input

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  1. CONNECT:[ UseTime:0.000650s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000804s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000330s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000297s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000622s ]
  6. SELECT * FROM `set` [ RunTime:0.000244s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000704s ]
  8. SELECT * FROM `article` WHERE `id` = 484431 LIMIT 1 [ RunTime:0.000530s ]
  9. UPDATE `article` SET `lasttime` = 1776725430 WHERE `id` = 484431 [ RunTime:0.007959s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.001632s ]
  11. SELECT * FROM `article` WHERE `id` < 484431 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000488s ]
  12. SELECT * FROM `article` WHERE `id` > 484431 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002978s ]
  13. SELECT * FROM `article` WHERE `id` < 484431 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001143s ]
  14. SELECT * FROM `article` WHERE `id` < 484431 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.010551s ]
  15. SELECT * FROM `article` WHERE `id` < 484431 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005686s ]
0.120009s