问题描述
我有几个相同设备的实例(一个基于I2C的IIO传感器),在两个I2C多路复用器后面有相同的I2C地址。我想根据确定性路径将iio:deviceX
符号链接到一个更有意义的名称(例如device = 0x29,mux = 0x70,总线1)
不幸的是,从udevadm info --attribute-walk --name=/dev/iio\:device0
看来,我无法基于以下属性与I2C地址进行匹配:
looking at device '/devices/pci0000:00/808622C1:00/i2c-0/i2c-5/i2c-PRP0001:02/iio:device0':
KERNEL=="iio:device0"
SUBSYstem=="iio"
DRIVER==""
ATTR{name}=="vl53l0x"
ATTR{in_distance_raw}=="8190"
ATTR{in_distance_scale}=="0.001000"
looking at parent device '/devices/pci0000:00/808622C1:00/i2c-0/i2c-5/i2c-PRP0001:02':
KERNELS=="i2c-PRP0001:02"
SUBSYstemS=="i2c"
DRIVERS=="vl53l0x-i2c"
ATTRS{name}=="vl53l0x"
looking at parent device '/devices/pci0000:00/808622C1:00/i2c-0/i2c-5':
KERNELS=="i2c-5"
SUBSYstemS=="i2c"
DRIVERS==""
ATTRS{name}=="i2c-0-mux (chan_id 0)"
looking at parent device '/devices/pci0000:00/808622C1:00/i2c-0':
KERNELS=="i2c-0"
SUBSYstemS=="i2c"
DRIVERS==""
ATTRS{name}=="Synopsys DesignWare I2C adapter"
looking at parent device '/devices/pci0000:00/808622C1:00':
KERNELS=="808622C1:00"
SUBSYstemS=="platform"
DRIVERS=="i2c_designware"
ATTRS{driver_override}=="(null)"
looking at parent device '/devices/pci0000:00':
KERNELS=="pci0000:00"
SUBSYstemS==""
DRIVERS==""
如何确定性地与这些传感器进行匹配?我什至不确定我是否可以假设I2C多路复用器将始终以相同的顺序进行初始化...
解决方法
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