Re: udev: rules using multiple sysfs directories

[Ian Pilcher <i.pilcher@comcast.net>]

I've got another example -- the AirPrime 5220 1xEVDO wireless modem for
which Greg K-H just whipped out a driver.  (Thanks Greg!)

This is a composite device with two serial ports:

Bus 004 Device 004: ID 0f3d:0112
Device Descriptor:
   bLength                18
   bDescriptorType         1
   bcdUSB               1.10
   bDeviceClass            0 (Defined at Interface level)
   bDeviceSubClass         0
   bDeviceProtocol         0
   bMaxPacketSize0        16
   idVendor           0x0f3d
   idProduct          0x0112
   bcdDevice            0.01
   iManufacturer           1 AirPrime, Incorporated
   iProduct                2 AirPrime CDMA Wireless PC Card
   iSerial                 0
   bNumConfigurations      1
   Configuration Descriptor:
     bLength                 9
     bDescriptorType         2
     wTotalLength           62
     bNumInterfaces          2
     bConfigurationValue     1
     iConfiguration          0
     bmAttributes         0xc0
       Self Powered
     MaxPower              100mA
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
       bInterfaceNumber        0
       bAlternateSetting       0
       bNumEndpoints           3
       bInterfaceClass       255 Vendor Specific Class
       bInterfaceSubClass    255 Vendor Specific Subclass
       bInterfaceProtocol    255 Vendor Specific Protocol
       iInterface              4 Data Interface
       Endpoint Descriptor:
         bLength                 7
         bDescriptorType         5
         bEndpointAddress     0x81  EP 1 IN
         bmAttributes            3
           Transfer Type            Interrupt
           Synch Type               none
           Usage Type               Data
         wMaxPacketSize     0x0010  bytes 16 once
         bInterval             128
       Endpoint Descriptor:
         bLength                 7
         bDescriptorType         5
         bEndpointAddress     0x8a  EP 10 IN
         bmAttributes            2
           Transfer Type            Bulk
           Synch Type               none
           Usage Type               Data
         wMaxPacketSize     0x0040  bytes 64 once
         bInterval               0
       Endpoint Descriptor:
         bLength                 7
         bDescriptorType         5
         bEndpointAddress     0x0b  EP 11 OUT
         bmAttributes            2
           Transfer Type            Bulk
           Synch Type               none
           Usage Type               Data
         wMaxPacketSize     0x0040  bytes 64 once
         bInterval               0
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
       bInterfaceNumber        1
       bAlternateSetting       0
       bNumEndpoints           2
       bInterfaceClass       255 Vendor Specific Class
       bInterfaceSubClass    255 Vendor Specific Subclass
       bInterfaceProtocol    255 Vendor Specific Protocol
       iInterface              4 Data Interface
       Endpoint Descriptor:
         bLength                 7
         bDescriptorType         5
         bEndpointAddress     0x82  EP 2 IN
         bmAttributes            2
           Transfer Type            Bulk
           Synch Type               none
           Usage Type               Data
         wMaxPacketSize     0x0040  bytes 64 once
         bInterval               0
       Endpoint Descriptor:
         bLength                 7
         bDescriptorType         5
         bEndpointAddress     0x05  EP 5 OUT
         bmAttributes            2
           Transfer Type            Bulk
           Synch Type               none
           Usage Type               Data
         wMaxPacketSize     0x0040  bytes 64 once
         bInterval               0
   Language IDs: (length=4)
      0409 English(US)

The first port (bInterfaceNumber 0) is the CDMA modem port; the second
port (bInterfaceNumber 1) is the "control port" which is used for
diagnostic information, etc.  I would like to create persistent names
for these two ports (/dev/cdma_modem and /dev/cdma_ctl or something
similar).  Since idVendor and idProduct are a directory above
bInterfaceNumber, there doesn't appear to be any way to do this.

This seems like a significant limitation for USB composite devices.

-- 
====================================
Ian Pilcher                                        i.pilcher@comcast.net
====================================



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