在系统开启并有日志打印的前提下，插入USB设备，就会打印USB设备和虚拟串口信息。
打印信息如下：
供应商ID（VID）：idVendor=1234，产品ID（PID）： idProduct=5678
Product、Manufacturer、SerialNumber，这三项暂时用不到。
ttyACM0：虚拟出来的串口，也有可能是ttySx、ttyGSx（x为0/1/2/3......）
[ 99.373774] usb 3-1.3: new full-speed USB device number 3 using usb20_host [ 99.473868] usb 3-1.3: New USB device found, idVendor=1234, idProduct=5678 [ 99.473970] usb 3-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 99.473997] usb 3-1.3: Product: USBKey Module [ 99.474016] usb 3-1.3: Manufacturer: USBKey Chip [ 99.474033] usb 3-1.3: SerialNumber: 202730041341 [ 99.483763] cdc_acm 3-1.3:1.0: This device cannot do calls on its own. It is not a modem. [ 99.491455] cdc_acm 3-1.3:1.0: ttyACM0: USB ACM device
先手动测试此虚拟串口能否使用（以虚拟串口的扫描枪为例）
$ adb shell // 查看虚拟的串口是否存在 root@xxx:/ # ls /dev/ttyACM0 ls /dev/ttyACM0 /dev/ttyACM0 // 如果不是 root 权限，此时使用 su 获取 root 权限 // 修改此虚拟串口为最高权限 root@xxx:/ # chmod 777 /dev/ttyACM0 chmod 777 /dev/ttyACM0 root@xxx:/ # cat dev/ttyACM0 cat dev/ttyACM0 // 开始扫码 DS610018C18021 DS610018C18021
确定虚拟串口可以使用，将设备添加到代码中。
同时添加了ttyACM0-3，为了防止插入多个设备而导致虚拟串口变动。
将VID和PID添加到数组 option_ids[] 中。USB_DEVICE(VID, PID)
diff --git a/device/rockchip/common/ueventd.rockchip.rc b/device/rockchip/common/ueventd.rockchip.rc old mode 100644 new mode 100755 index 34f7ad1..d82fad3 --- a/device/rockchip/common/ueventd.rockchip.rc +++ b/device/rockchip/common/ueventd.rockchip.rc @@ -116,3 +116,8 @@ /dev/i2c-2 0660 system system /dev/i2c-3 0660 system system /dev/i2c-4 0660 system system + +/dev/ttyACM0 0666 system system +/dev/ttyACM1 0666 system system +/dev/ttyACM2 0666 system system +/dev/ttyACM3 0666 system system diff --git a/kernel/drivers/usb/serial/option.c b/kernel/drivers/usb/serial/option.c index e7ecdc3..9f1a6b6 100755 --- a/kernel/drivers/usb/serial/option.c +++ b/kernel/drivers/usb/serial/option.c @@ -1766,6 +1766,8 @@ static const struct usb_device_id option_ids[] = { {USB_DEVICE(0x0E8D,0x00A5)}, {USB_DEVICE(0x05C6,0x9025)}, + {USB_DEVICE(0x1234,0x5678)},//扫描枪 { } /* Terminating entry */ };