Re: udev: rules using multiple sysfs directories

[Greg KH <greg@kroah.com>]

On Thu, Apr 28, 2005 at 03:28:31PM -0500, Ian Pilcher wrote:
> 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.

You can do this, as you get two different hotplug events.  This is
because usb drivers bind to the USB inteface, not the main device
itself.

> This seems like a significant limitation for USB composite devices.

No, all USB devices work like this.

I'll try to make a udev rule that would work for this, can you send me
the output of udevinfo for this:
	udevinfo -a /sys/class/tty/ttyUSB0
	udevinfo -a /sys/class/tty/ttyUSB1

thanks,

greg k-h


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