我在用Beagleboard-xm和3.12 内核以及来自 Robert Nelson 网站的 ubuntu rootfs。
我用的是Telit HE910 GPS+GSM调制解调器和我的项目一起。因此，根据硬件用户指南，我必须在此调制解调器的输入上应用 5 秒的逻辑高电平才能启用它
因此，当我使用脚本切换 gpio 引脚 5 秒时，我会在终端上收到一些消息
我确信该消息来自驱动程序，usb/class/cdc-acm.c但找不到背后的原因？
我该如何解决这个问题？
root@arm:~# ./modem_on.sh
Turning on Telit modem ......
going to sleep and toggle
[ 70.791381] cdc_acm 1-2:1.0: This device cannot do calls on its own. It is not a modem.
[ 74.390258] cdc_acm 1-2:1.0: This device cannot do calls on its own. It is not a modem.
[ 74.406890] cdc_acm 1-2:1.2: This device cannot do calls on its own. It is not a modem.
[ 74.462188] cdc_acm 1-2:1.4: This device cannot do calls on its own. It is not a modem.
[ 74.478363] cdc_acm 1-2:1.6: This device cannot do calls on its own. It is not a modem.
[ 74.495269] cdc_acm 1-2:1.8: This device cannot do calls on its own. It is not a modem.
[ 74.510040] cdc_acm 1-2:1.10: This device cannot do calls on its own. It is not a modem.
[ 74.530090] cdc_acm 1-2:1.12: This device cannot do calls on its own. It is not a modem.
[ 74.619720] cdc_acm 1-2:1.0: This device cannot do calls on its own. It is not a modem.
[ 74.634429] cdc_acm 1-2:1.2: This device cannot do calls on its own. It is not a modem.
[ 74.649475] cdc_acm 1-2:1.4: This device cannot do calls on its own. It is not a modem.
[ 74.664459] cdc_acm 1-2:1.6: This device cannot do calls on its own. It is not a modem.
[ 74.678741] cdc_acm 1-2:1.8: This device cannot do calls on its own. It is not a modem.
[ 74.693389] cdc_acm 1-2:1.10: This device cannot do calls on its own. It is not a modem.
[ 74.708099] cdc_acm 1-2:1.12: This device cannot do calls on its own. It is not a modem.
Script complete ..........
dmesg 的相关必要部分如下
[ 30.623107] init: plymouth-upstart-bridge main process ended, respawning
[ 70.629943] usb 1-2: new high-speed USB device number 2 using ehci-omap
[ 70.782501] usb 1-2: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 255, changing to 11
[ 70.782592] usb 1-2: New USB device found, idVendor=058b, idProduct=0041
[ 70.782623] usb 1-2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 70.791381] cdc_acm 1-2:1.0: This device cannot do calls on its own. It is not a modem.
[ 70.801483] cdc_acm 1-2:1.0: ttyACM0: USB ACM device
[ 73.041625] usb 1-2: USB disconnect, device number 2
[ 74.209930] usb 1-2: new high-speed USB device number 3 using ehci-omap
[ 74.369049] usb 1-2: New USB device found, idVendor=1bc7, idProduct=0021
[ 74.369110] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 74.369140] usb 1-2: Product: Telit Wireless Module
[ 74.369171] usb 1-2: Manufacturer: Telit wireless solutions
[ 74.369201] usb 1-2: SerialNumber: 357164042197668
[ 74.390258] cdc_acm 1-2:1.0: This device cannot do calls on its own. It is not a modem.
[ 74.400207] cdc_acm 1-2:1.0: ttyACM0: USB ACM device
[ 74.406890] cdc_acm 1-2:1.2: This device cannot do calls on its own. It is not a modem.
[ 74.416900] cdc_acm 1-2:1.2: ttyACM1: USB ACM device
[ 74.462188] cdc_acm 1-2:1.4: This device cannot do calls on its own. It is not a modem.
[ 74.472259] cdc_acm 1-2:1.4: ttyACM2: USB ACM device
[ 74.478363] cdc_acm 1-2:1.6: This device cannot do calls on its own. It is not a modem.
[ 74.488372] cdc_acm 1-2:1.6: ttyACM3: USB ACM device
[ 74.495269] cdc_acm 1-2:1.8: This device cannot do calls on its own. It is not a modem.
[ 74.505279] cdc_acm 1-2:1.8: ttyACM4: USB ACM device
[ 74.510040] cdc_acm 1-2:1.10: This device cannot do calls on its own. It is not a modem.
[ 74.520141] cdc_acm 1-2:1.10: ttyACM5: USB ACM device
[ 74.530090] cdc_acm 1-2:1.12: This device cannot do calls on its own. It is not a modem.
[ 74.540283] cdc_acm 1-2:1.12: ttyACM6: USB ACM device
[ 74.619720] cdc_acm 1-2:1.0: This device cannot do calls on its own. It is not a modem.
[ 74.629455] cdc_acm 1-2:1.0: ttyACM0: USB ACM device
[ 74.634429] cdc_acm 1-2:1.2: This device cannot do calls on its own. It is not a modem.
[ 74.644042] cdc_acm 1-2:1.2: ttyACM1: USB ACM device
[ 74.649475] cdc_acm 1-2:1.4: This device cannot do calls on its own. It is not a modem.
[ 74.659027] cdc_acm 1-2:1.4: ttyACM2: USB ACM device
[ 74.664459] cdc_acm 1-2:1.6: This device cannot do calls on its own. It is not a modem.
[ 74.674133] cdc_acm 1-2:1.6: ttyACM3: USB ACM device
[ 74.678741] cdc_acm 1-2:1.8: This device cannot do calls on its own. It is not a modem.
[ 74.688415] cdc_acm 1-2:1.8: ttyACM4: USB ACM device
[ 74.693389] cdc_acm 1-2:1.10: This device cannot do calls on its own. It is not a modem.
[ 74.703186] cdc_acm 1-2:1.10: ttyACM5: USB ACM device
[ 74.708099] cdc_acm 1-2:1.12: This device cannot do calls on its own. It is not a modem.
[ 74.717895] cdc_acm 1-2:1.12: ttyACM6: USB ACM device
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