on my slackware11 the huawei e220 device is detected as mass storage  
device.. i found a way to prevent the kernel from this by adding it to  
the unusual_devs.h

the diff to 2.6.18.1:

1274,1284d1273
< /* This prevents the kernel from detecting the Huawei-E220  
USB-UMTS-Modem as mass storage device.
<    The storage-device is nothing else than a virtual cd-drive with  
the windows drivers.
<    modprobe usbserial usbserial vendor=0x12d1 product=0x1003 will  
bringup the modem-device
<    <johann.wilhelm(at)student.tugraz.at>
< */
< UNUSUAL_DEV( 0x12d1, 0x1003, 0x0000, 0xffff,
<               "HUAWEI",
<               "E220 USB-UMTS Install",
<               US_SC_DEVICE, US_PR_DEVICE, NULL,
<               US_FL_IGNORE_DEVICE),
<


interesting part of cat /proc/bus/usb/devices:

T:  Bus=03 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  5 Spd=12  MxCh= 0
D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=12d1 ProdID=1003 Rev= 0.00
S:  Manufacturer=HUAWEI Technologies
S:  Product=HUAWEI Mobile
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=500mA
I:  If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usbserial
E:  Ad=83(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=04(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms

i'm not deep enought into hotplug :(
but because i use this device in a router coldplugging is ok for  
me.... followind in my rc.modules should do:

# Huawei E220 support
/sbin/modprobe usbserial vendor=0x12d1 product=0x1003
/usr/bin/mknod /dev/ttyUSB0 c 188 0
/usr/bin/mknod /dev/ttyUSB1 c 188 1
/usr/bin/mknod /dev/ttyUSB2 c 188 2
/usr/bin/ln -sf /dev/ttyUSB0 /dev/modem

this should work (at least a my machine) on slackware 11 with kernel 2.6.18.1

73 de oe6jwf / Hans


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