63 lines
1.8 KiB
Markdown
63 lines
1.8 KiB
Markdown
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# Udevadm 说明
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## 1. 安装
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```bash
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# Ubuntu 16.04
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apt install udev
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```
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## 2. 使用
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### 2.1. 监控 UEvent
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```bash
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udevadm monitor
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# 热插拔设备出现类似 Log
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KERNEL[4907.940589] add /devices/platform/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1:1.9/ttyUSB7/tty/ttyUSB7 (tty)
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UDEV [4908.211629] add /devices/platform/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1:1.9/ttyUSB7/tty/ttyUSB7 (tty)
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```
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### 2.2. 获取 UDev 信息
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```bash
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udevadm info <device node>
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# 如
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udevadm info /dev/ttyUSB7
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P: /devices/platform/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1:1.9/ttyUSB7/tty/ttyUSB7
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N: ttyUSB7
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S: serial/by-id/usb-LONGSUNG_M5700-if09-port0
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S: serial/by-path/platform-ci_hdrc.1-usb-0:1:1.9-port0
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E: DEVLINKS=/dev/serial/by-id/usb-LONGSUNG_M5700-if09-port0 /dev/serial/by-path/platform-ci_hdrc.1-usb-0:1:1.9-port0
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E: DEVNAME=/dev/ttyUSB7
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E: DEVPATH=/devices/platform/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1:1.9/ttyUSB7/tty/ttyUSB7
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E: ID_BUS=usb
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E: ID_MODEL=M5700
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E: ID_MODEL_ENC=M5700
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E: ID_MODEL_ID=4d11
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E: ID_PATH=platform-ci_hdrc.1-usb-0:1:1.9
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E: ID_PATH_TAG=platform-ci_hdrc_1-usb-0_1_1_9
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E: ID_REVISION=0000
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E: ID_SERIAL=LONGSUNG_M5700
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E: ID_TYPE=generic
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E: ID_USB_DRIVER=option
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E: ID_USB_INTERFACES=:020600:0a0000:ff0000:
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E: ID_USB_INTERFACE_NUM=09
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E: ID_VENDOR=LONGSUNG
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E: ID_VENDOR_ENC=LONGSUNG
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E: ID_VENDOR_FROM_DATABASE=Spreadtrum Communications Inc.
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E: ID_VENDOR_ID=1782
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E: MAJOR=188
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E: MINOR=7
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E: SUBSYSTEM=tty
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E: TAGS=:systemd:
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E: USEC_INITIALIZED=4908169711
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```
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## 外部参考资料
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1. [How to Use Udev for Device Detection and Management in Linux](https://www.tecmint.com/udev-for-device-detection-management-in-linux/)
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2. [udevadm 命令详解](https://www.cnblogs.com/carriezhangyan/p/9564900.html)
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